JP2022176070A - Flexible conduit joint part for wall-burying, connection structure between manhole or handhole and flexible conduit, network of flexible conduit, connection structure for wall connection of manhole or handhole, method for constructing submerged manhole or handhole, method for connecting flexible conduit to submerged manhole or handhole, method for manufacturing flexible conduit joint part for wall-burying - Google Patents

Abstract

To provide a flexible conduit joint part for wall buying or the like which is embedded in the wall of a manhole or a handhole in advance and used to connect a connection part of the manhole or handhole to a flexible conduit with one touch.SOLUTION: A joint component 1 is a tubular member made of a hard resin material. A bell mouth portion 3, a main body portion 5, a slope portion 7, and an enlarged diameter portion 9 are formed in order from one end portion to the other end portion of the joint component 1. The enlarged diameter portion 9 has a substantially cylindrical outer shape. A female joint structure 11 is formed on the inner surface of the enlarged diameter portion 9. In the female joint structure 11, a first storage space 13, a partition 15, and a second storage space 17 are formed in order from the inside of the joint component 1 toward the opening at the other end. The female joint structure 11 is formed by cutting.SELECTED DRAWING: Figure 1

Description

The present invention provides a wall surface-embedded flexible conduit joint component that enables easy connection of a flexible conduit to a handhole or manhole, a connection structure between a manhole or a handhole and a flexible conduit, and a flexible Conduit conduit network, manhole or handhole wall connection connection structure, method of constructing submerged manhole or handhole, method of connecting flexible conduit to submerged manhole or handhole, and The present invention relates to a method for manufacturing a flexible conduit joint component for wall-burying.

Conventionally, for example, construction of electric utility utility tunnels is construction that is carried out on public roads. From this background, it is desirable that joint parts for connecting conduits are attached in advance to connecting portions such as manholes, and that the conduits are only connected during construction.

In addition, especially in the case of the submerged precast concrete manhole disclosed in JP-A-1-304228, since the manhole is installed submerged in the ground during construction, if the joint parts protrude from the wall of the manhole, it will be damaged. . On the other hand, by embedding the entire joint part in the wall of the manhole, etc., it is possible to suppress damage during construction, improve loading efficiency during transportation, and prevent damage to joint parts during transportation and construction. prevention is desired.

In addition, by miniaturizing manholes and handholes, it is possible to reduce costs by reducing material costs and the amount of excavation. In addition, miniaturization leads to weight reduction, and improvement in handling during construction can be expected. In addition, many existing buried objects are buried in the road, and it is desirable to avoid them during construction. is advantageous. In addition, when the road is narrow, it is necessary to reduce the area required for connection and downsize the entire system. In particular, when connecting a plurality of electric conduits to a handhole or a manhole, it is preferable to arrange the joints densely in order to reduce the area required for connection and to make the whole device compact. In addition, in electric wire common grooves, PVC pipes having a simple cross-sectional circular cross-section and high rigidity have been conventionally used in many electric conduits. However, PVC pipes are heavy and have no flexibility, so workability is poor, and improvements have been desired.

On the other hand, in recent years, the use of rectangular flexible conduits as conduits has been promoted. Rectangular flexible conduits can be directly stacked on top of each other, so they can be compactly aligned during installation, reducing the amount of excavation, shortening construction time and reducing construction costs. In addition, as compared with PVC pipes, it is lighter and easier to transport, and since it is flexible, bent pipes are not required. Furthermore, by aligning them compactly, the risk of interfering with existing buried objects is reduced, and even if they interfere, they can be easily avoided due to their flexibility. For this reason, there is a need for a joint part that can be used by embedding it in the wall of the connecting part in advance, and that has a simple outer peripheral structure for directly connecting the connecting part and the rectangular flexible conduit with a single touch. rice field.

Further, in the conventional joint member formed at at least one end of the rectangular electric wire tube, the receiving portion for the locking member and the receiving portion for the water stop member are separated independently by a predetermined distance. In addition, the joint members used to connect conventional corrugated flexible conduits are manufactured by injection molding or blow molding. is formed. On the other hand, as described above, in many cases, for submerged manholes, tubular joints with circular cross-sections, which have simple external shapes and allow close piping, were used. In some cases, there was no connection structure for housing a locking member such as a ring member in the connecting portion of the electric conduit.

The present invention has been made in view of such problems, and is used by embedding it in the wall of a manhole or handhole in advance, and enables one-touch connection between the connecting portion of the manhole or handhole and the flexible conduit, At that time, the cross-sectional area of the part can be made smaller, and it is possible to arrange it densely in the connection part, and the wall-embedded flexible conduit joint part, which can improve the concrete placing performance, has a simple outer peripheral part. It consists of a cylindrical member with a continuous two-stage circular cross section, and by using the inner peripheral surface of the enlarged diameter portion of the cylindrical member as it is or by forming a groove in the cylindrical portion of the cylindrical member by cutting, It can be used as a locking member storage portion or a water stop member storage portion, and a storage portion (storage space) for locking the locking member is formed inside the enlarged diameter portion of the cylindrical member, and has a two-step diameter. By using the sloped portion that converts to as a retaining structure and a positioning structure for the male part of the electric conduit, a joint structure that allows one-touch connection is realized.

As an embedded joint part for connecting such a wire tube and a connection part of a manhole or a handhole, for example, a straight cylindrical pipe insertion part as a female joint structure as a bell mouth part and a pipe joint mounting part A short pipe for attaching a pipe joint has been proposed (Patent Document 1).

In addition, for connecting corrugated pipes and connection parts of manholes and handholes, there has been proposed an embedded joint part that is connected by screwing in a helical shape having a complicated outer peripheral part of the joint part (Patent document 2).

In addition, insert the protection tube to the middle of the length direction of the manhole socket short pipe, insert an elastic material between the insertion end of the protection tube and the stepped part at the back of the socket, and insert the protection tube. There has been proposed a manhole portion of a protective tube for an underground cable for straight pipe insertion, in which a waterproof packing is interposed between the outer surface of the manhole and the inner surface of the manhole socket short pipe (Patent Document 3).

Also, a block body has been proposed that is attached to the side wall of a handhole or manhole to connect a cable protection tube (Patent Document 4). Patent Document 4 discloses a block body made of resin concrete having an insertion hole for inserting an end of a cable protection tube, and a plurality of retaining members made of synthetic resin or metal attached to the block body. Prepare. The end of the cable protection tube can be removed from the insertion hole by engaging the locking piece elastically restored in the radially inward direction with the engagement protrusion at the end of the cable protection tube inserted into the insertion hole. can be prevented.

Further, there has been proposed a pipe joint embedded in the side wall of a handhole, which includes a joint body, a locking claw, and a tool insertion portion, and the joint body has an insertion portion into which a corrugated pipe is inserted. (Patent Document 5). Patent document 5 engages with a locked portion of a corrugated tube inserted into an insertion portion to prevent the corrugated tube from coming off. A tool is formed on the joint main body facing the front surface of the insertion portion, and can be inserted from the front surface side of the insertion portion for releasing the engagement between the locked portion and the locking claw.

Further, a bell mouth has been proposed in which a locking ring having a locking pawl projecting inward is installed inside a female joint structure provided at the tip of a rectangular electric wire tube (Patent Document 6).

JP-A-11-215677 JP 2009-159742 A Japanese Patent Application Laid-Open No. 2000-240082 JP 2011-234520 A JP-A-2003-90473 JP 2006-322491 A

However, the electric wire pipe of Patent Document 1 is assumed to be a non-stretchable straight pipe such as a PVC pipe or a steel pipe, and does not connect the male joint structure and the female joint structure inside the joint. Furthermore, it is necessary to attach another joint part between the embedded joint part and the conduit to cope with expansion and contraction of the conduit due to an earthquake or the like, which is troublesome. That is, although a straight tubular portion is used as the female joint portion, there is no structure for locking the inserted pipe inside the joint, and the structure is such that the rigid pipe is simply inserted into the female joint portion. It is a rigid pipe connection structure like a PVC pipe, and is not a structure for connecting a flexible wire tube by connecting a female joint structure and a male joint structure. In addition, since the conduit body is inserted into the joint part, the outer dimensions of the joint part become large, making it difficult to attach the joint part tightly. In addition, in Patent Document 1, the short pipe for attaching the pipe joint must be installed slightly behind the outer peripheral surface of the handhole, and when concrete is placed and embedded in the wall of the handhole, it is difficult to fix and the short pipe cannot be fixed. There is a problem that concrete easily penetrates from the end to the inside.

In addition, the system of Patent Document 2 is a spiral insertion type joint component, not a linear insertion type joint component that enables one-touch connection. Therefore, since the joint portion is also formed in a helical shape corresponding to the structure of the spirally connected member, the shapes of both the outer peripheral portion and the inner peripheral portion of the joint member are complicated.

Since the spiral conduit is usually manufactured as a long body of several tens of meters, the conduit itself cannot be helically rotated and directly connected to the connecting part. For this reason, another joint part that can be connected to the spiral conduit body having a retaining function and a water stop function for connecting the joint member embedded in the connection part and the conduit is provided in addition to the joint part embedded in the connection part. is necessary for Therefore, the construction is troublesome and the cost is high. In other words, it is a spiral insertion type joint component, not a linear insertion type joint component capable of one-touch connection. In addition, another joint member is required to provide retention and water resistance. In addition, since the conduit body is inserted into the joint part, the outer dimensions of the joint part become large, making it difficult to closely attach the joint part to a manhole or handhole. Furthermore, in Patent Document 2, the shape of the end part does not take into consideration the workability when embedding the duct mouth member in the wall of the handhole, and when concrete is poured and embedded in the wall of the handhole, it is difficult to fix. There is a problem that concrete tends to enter inside from the end of the member.

Further, the electrical conduit of Patent Document 3 is assumed to be a non-stretchable straight pipe such as a vinyl chloride pipe or a steel pipe, and the joint structure of the present invention has a straight pipe-like cylindrical cylindrical portion that is the inner surface of the joint structure. A straight tubular member or a straight rigid pipe is inserted into the female joint structure formed in the joint. , has a structure similar to that of Patent Document 1. Therefore, it has a structure in which cylindrical sponge rubber, stopper rubber, water stop packing, etc. are arranged in order inside the female joint structure in a substantially cylindrical space, and the inserted inner pipe has a locking structure. Due to the structure in which the extra length of the cylindrical tubular portion is used to prevent slippage, the length of the embedded joint part in the longitudinal direction becomes long, and the wall thickness of the connection part that can be embedded is greatly restricted. be. In addition, since the conduit body is inserted into the joint part, the outer dimensions of the joint part become large, making it difficult to closely attach the joint part to a manhole or handhole. Moreover, Patent Document 3 does not mention a method of embedding the manhole socket short pipe in the wall of the manhole, and does not consider workability.

In addition, in the system of Patent Document 4, the joint parts are made of resin concrete and are heavy, which imposes a heavy burden on the operator and may break when dropped. In addition, the cross section of the joint part has a square-shaped right-angled cross section, and when concrete is poured into the wall of the connecting part of a manhole or handhole, it is difficult for the concrete to flow around the joint part. Poor embedding is likely to occur. Furthermore, when a small number of joint parts are arranged, there is a problem that the arrangement interval between blocks cannot be adjusted because the blocks are formed with predetermined dimensions. In addition, when multiple blocks are used in combination, it is possible that the bonding strength and watertightness of the blocks cannot be ensured because the method of adhesion between the blocks and the method of water stoppage treatment are unknown.

In addition, the joint part of Patent Document 5 has a large outer dimension because the conduit body is inserted into the joint part. In particular, when the locking claw is released by the locking claw release mechanism, a space for retracting and storing the locking claw is required. It is difficult to attach tightly.

Further, Patent Document 5 has a joint structure having an uneven structure on the outer peripheral surface of the female joint structure portion, and the structure of the joint member is such that the structure of the joint member is a locking member inside the side wall of the cylindrical portion with a circular cross section as in the present application. The structure is different from that of a joint member provided with a connecting structure such as a storage space and a waterproof member storage space. In Patent Document 5, a connecting member is attached to an independent wave conduit, and a rectangular conduit is not connected. Further, in Patent Document 5, since the locking ring has a pressing operation portion and a space for retracting the ring, the electric conduit cannot be arranged densely. Furthermore, since the outer side of the female joint structure has a concave-convex structure, it is difficult for concrete to wrap around the female joint member, and the female joint members cannot be densely arranged. In addition, when the packing attached to the tip of the flexible conduit is inserted into the female joint, it passes through the locking pawl, which may damage the packing and impair its water-tightness. Furthermore, the inner wall of the joint member is damaged due to the use of a tool when attaching and detaching the joint member, making it difficult to obtain water-tightness.

In addition, the female joint structure of Patent Document 6 has a simple cylindrical outer peripheral shape of the joint for the purpose of forming it inside a concrete wall, and a connection structure such as a locking portion and a water stop portion is provided inside the cylindrical shape. Since the connection structure between the joint member and the electric conduit is formed outside the concrete wall, it cannot be applied to the subsidence type manhole. The female joint structure of Patent Document 6 is not formed in a two-step cylindrical shape as a whole, and does not have a sloped portion, so it does not have the retaining effect or the stress dispersing effect, which will be described later. In addition, vertical partition walls and acute-angled grooves are formed on the outer side of the joint structure, and the outer circumference of the joint member is not formed in a cylindrical shape, and it is assumed that the connection structure is formed inside the concrete wall. Therefore, if this structure is to be formed inside a concrete wall, the pourability of the concrete at that time is poor.

The present invention has been made in view of such problems, and is used by embedding it in advance in the wall of manholes and handholes, and with a simple structure, the connection part of the manhole or handhole and the flexible electric conduit are linearly inserted. At this time, it is possible to secure the flexible conduit tube from coming off, and at the same time, it is possible to secure water stoppage. A wall-embedded flexible conduit joint part that can be densely arranged at a connecting part and that can improve the pourability of concrete, a connection structure between a manhole or a handhole and a flexible conduit, and a flexible conduit network of conduits, method of forming wall connections for manholes or handholes, method of constructing submerged manholes or handholes, method of connecting flexible conduits to submerged manholes or handholes, for wall embedding It is an object of the present invention to provide a method of manufacturing a flexible conduit fitting component. It is another object of the present invention to provide a joint component for a flexible electric conduit that is not wall-embedded. According to the present invention, only by inserting the flexible cable tube into the joint component, it becomes possible to fix them to the joint surfaces thereof without using an adhesive.

In order to achieve the above object, a first invention is a joint component having a female type joint structure that can be used without protruding from the wall surface of a manhole or handhole, the joint component comprising: The joint part is a tubular member made of a hard resin material, and the joint part has a substantially cylindrical outer shape for inserting a bell mouth portion, an electric wire or a cable from one end to the other end. A main body portion having a shape, a slant portion transitioning from the main body portion to the enlarged diameter portion, and an enlarged diameter portion adjacent to the slant portion and having an inner diameter larger than the main body portion and having a substantially cylindrical outer shape are formed in this order. , the open end of the bell mouth portion is enlarged in diameter from the main body portion, and the outer shape from the bell mouth portion to the enlarged diameter portion has a cylindrical cross section formed with two stages of different outer diameters, The slope portion has a slope structure in which the pipe inner and outer diameters gradually increase in the pipe axial direction from the main body portion toward the enlarged diameter portion, and the female joint structure is formed on the inner surface of the cylindrical space of the enlarged diameter portion. The female joint structure includes a locking member for locking the male joint structure and a packing that seals water between the female joint structure and the male joint structure. 1. A wall surface-embedded flexible conduit joint component that can be accommodated at a predetermined distance from each other toward an opening from the depth side of the inner peripheral surface of a space having a substantially cylindrical cross section.

The female joint structure portion includes a groove having a substantially cylindrical cross section formed by cutting at a predetermined position in the space having a substantially cylindrical cross section, and a partition portion formed between the grooves without cutting. Thus, the space created by the groove having the substantially cylindrical cross section is divided into two spaces, a first storage space and a second storage space, by the partition section, and the first storage space and the partition section are divided into the first storage space and the second storage space. , the second storage space is formed in order from the inside of the joint part toward the opening of the other end, and the first storage space and the second storage space are formed inwardly of the pipe; Two storage spaces having a substantially cylindrical cross section with a predetermined width and a predetermined depth are partitioned by the protruding partition, and the male joint structure is contained in the first storage space of the female joint structure. A locking member for locking the male joint structure can be stored in the second storage space. A wall-embedded flexible conduit joint component characterized by:
Here, the locking member housed in the first housing space may be fixed to the male joint structure to lock the female joint structure, or may be fixed to the female joint structure. Anything that is fixed and locks the male fitting structure. As described above, the joint part of the present invention has a simple two-stage cylindrical structure with a first housing space and a second housing space, whereby the locking member is housed in the first housing space. Alternatively, by locking and housing the packing in the second housing space, the female joint structure can lock the flexible conduit to the joint part and at the same time ensure water cutoff between the flexible conduit and the joint part. It can be a wall-embedded flexible conduit fitting component having

When connecting the male joint structure of the flexible conduit to the female joint structure, the distal end of the male joint structure abuts against the inner wall of the slope, so that the slope is The male joint structure can be prevented from coming off, the first storage space can accommodate a ring member for locking the male joint structure, and the second storage space can accommodate a ring member for locking the male joint structure. The packing of the male joint structure may be retractable.

For example, by using, as a joint component, a member having a cylindrical cross section and having two stages of different outer diameters and having the main body portion, the enlarged diameter portion, and the inclined surface portion, the female joint structure portion formed by the enlarged diameter portion can be formed. The space accommodates the male joint structure and the locking member for locking it, and the locking member enables the female joint structure and the male joint structure to be fitted and fixed. For example, a ring-shaped locking member may be attached to the cylindrical surface of the substantially cylindrical space to fix the locking member, and the water stop member may be arranged at a predetermined distance from the locking member.

By adopting such an arrangement, a locking structure and a water stop structure are provided inside the female joint structure inside the two-stage cylindrical member, and further, the male joint structure is connected to the bellmouth side. It is possible to secure the locking and the positioning of the male joint structure to the locking member. In this case, the male joint structural portion is a cylindrical member having an uneven structure in which the tip of the male joint structural portion is larger than the inner diameter of the main body portion of the joint member, and the section perpendicular to the pipe axis direction of the joint member has a circular concave-convex structure, It is desirable to form a shape having a plurality of concave portions. A locking member may be arranged or engaged in the front recess of the male joint structure, and a rubber packing may be arranged in the rear recess as a waterproof member.

In the case of a joint member in which a groove is formed by cutting in the expanded diameter portion having the first storage space and the second storage space, or instead of forming the groove by cutting, a sheet-like member is attached to the partition portion. is formed as a projection, the shape of the male joint structure used for this has the same structure both when grooves are formed by cutting and when the partition is formed as a projection by pasting a sheet-like member. There may be. As a material for the sheet member, a resin sheet or a metal sheet such as aluminum can be used. As the resin material used for the resin sheet, hard resin materials such as hard vinyl chloride, ABS resin, PET resin, PC resin, and glass fiber reinforced thermoplastic resin can be used.

A second enlarged diameter portion, which is wider than the enlarged diameter portion, is formed on the opening side of the enlarged diameter portion, and the outer peripheral surface of the second enlarged diameter portion is formed in a substantially cylindrical shape having the same diameter. Alternatively, a cylindrical cylindrical portion is formed in a cylindrical shape that gently expands outward at a predetermined angle, and the outer peripheral surface of the expanded diameter portion has at least a wall perpendicular to the pipe axis direction. Alternatively, it is desirable that no acute-angled cross section is formed.

Furthermore, the inner periphery of the second enlarged diameter portion may be expanded gently at a predetermined angle toward the distal end in the same manner as the outer periphery of the second enlarged diameter portion, or the enlarged diameter portion may be expanded without expanding. The enlarged diameter portion and the second enlarged diameter portion are either formed to have the same size as the inner circumference, and the enlarged diameter portion and the second enlarged diameter portion are formed continuously, or are separated by a partition portion, and the enlarged diameter portion When the portion and the second enlarged diameter portion are separated by a partition portion, the first storage space and the second storage space may be formed with the partition portion therebetween.

Moreover, it is desirable that the diameter expansion angle of the outer circumference of the second diameter expansion portion is 10° or less with respect to the pipe axis direction. Here, the inner peripheral surface of the second enlarged diameter portion may be expanded parallel to the outer peripheral surface and the inner peripheral surface, or may be expanded at an angle smaller than the outer peripheral surface. You may form in parallel, without expanding. Further, in order to widen the inner peripheral surface of the second enlarged diameter portion at an angle smaller than that of the outer peripheral surface, or to form the inner peripheral surface parallel without expanding the inner peripheral surface, it is necessary to finish the inner peripheral surface by cutting. be. From the viewpoint of densely arranging pipes, it is advantageous to reduce the outer diameter of the joint part, but by purposely forming the second enlarged diameter part, the joint part will be pushed inside the handhole during an earthquake or when the cable is routed. The load applied to the slanted surface can be dispersed when the slanted surface is bent, making it difficult for the slanted surface to be damaged.

In particular, when the female joint structure is formed by cutting, the wall thickness becomes thin, and the strength tends to decrease especially at the tip of the joint. It becomes difficult to fix to Therefore, if the inner peripheral surface of the second enlarged diameter portion is intentionally formed by cutting substantially parallel, the cross section of the second enlarged diameter portion is formed in a wedge shape with a thick tip portion, so that the load is reduced. In addition to the effect of dispersing the At the same time, it is possible to increase the water stoppage during concrete placement. If the inner peripheral surface of the second enlarged diameter portion is formed in a shape that is substantially parallel to the outer peripheral surface or slightly widens at an angle different from the outer peripheral surface, the above effect cannot be obtained, but the male joint structure part It has a guide effect that makes it easier to insert.

It is desirable that the height of the diameter-reduced portion formed by the partition is 2 mm or more and 5 mm or less. In this case, the height of the partition may be determined by cutting or by sticking a sheet-like member to form the diameter-reduced portion using the partition as a projection. are the same height.

The hard resin material is desirably at least one of hard vinyl chloride, ABS resin, PET resin, PC resin, and glass fiber reinforced thermoplastic resin.

At least one of the end face of the opening at the tip of the female joint structure for connecting with the flexible wire tube of the joint component and the end face of the opening at the tip of the bell mouth portion is formed flat. It is desirable to be

A flat surface is formed on at least one of the end face of the opening at the tip of the female joint structure for connecting with the flexible cable tube of the joint component and the end face of the opening at the tip of the bell mouth portion. An elastic body may be attached to the surface.

A waterproof member may be annularly attached to the outer peripheral surface of the joint component at a predetermined position on at least a part of the outer peripheral surface of the joint component.

Sand may be annularly adhered to a predetermined position on at least a part of the outer peripheral surface of the joint component so as to surround the outer peripheral surface of the joint component in the circumferential direction.

The nominal diameter of the flexible conduit to be connected is printed on at least one of the inner surface of the female joint structure for connecting with the flexible conduit of the joint part and the inner surface of the bell mouth portion. may

According to the first aspect of the invention, the male joint structure of the flexible conduit is formed by the joint component that has the female joint structure that can be connected to the flexible conduit, and that is embedded in the wall of the connecting part of the manhole or handhole. It can be connected to the joint structure with one touch. In addition, another member having a male joint structure can be connected to the cut portion of the flexible electric conduit, and can be connected to the part made of the hard resin material of the present invention by one touch. In particular, by using square flexible conduits as flexible conduits, it is possible to expect a reduction in construction time and construction costs. In addition, it is expected to improve the transportation efficiency of manholes and handholes and prevent damage to joint parts during transportation and construction. Furthermore, by making the cross-sectional dimension of the joint part substantially equal to or smaller than the maximum cross-section of the electric conduit, the joint parts can be densely arranged in manholes, handholes, etc., so that it is possible to reduce the size and weight of these parts.

More specifically, according to the present invention, since the joint part is a tubular member with a two-stage cylindrical cross-sectional shape at the outer peripheral portion of the joint part made of a hard resin material, when it is embedded in the wall surface of a manhole or handhole, When pouring concrete to harden the periphery of the joint, it is possible to prevent deformation of the joint part due to the weight of the concrete and the heat of reaction when the concrete solidifies. In addition, the dimensional accuracy of the female joint structure is high, and the insertability of the male joint structure and the storage space for the locking ring formed by cutting on the inner peripheral surface of the cylindrical side surface can be ensured. In addition, since the outer peripheral portion of the joint component is a cylindrical member with a two-stage cylindrical cross-section, and there is no vertical wall or the like on the outer peripheral portion of the member, air pockets are less likely to occur when placing concrete.

In addition, since the ring member for locking the male joint structure is stored in the first storage space as a retaining structure, the dimensional accuracy and rigidity of the storage space for storing the ring member are high. The member is stably supported in the first storage space. Further, in this case, the locking claw is stored in the first storage space, and the tip of the locking claw abuts against the side surface of the cross-sectionally reduced portion of the partition portion having a cylindrical cross section, so that a pull-out force is applied from the outside. I can't get out of it.

In addition, the female joint structure portion is formed of a two-stage substantially cylindrical cylindrical member having no cross section perpendicular to the pipe axis direction, and the storage space for the packing and the locking ring is divided into the cylindrical space of the enlarged diameter portion. It becomes a space divided by the inner partition. As a result, it is possible to realize a compact structure, and the slanted portion connecting the two-stage cylinders can prevent the device from slipping forward and evenly distribute the load in the event of an earthquake. In addition to the anti-disengagement effect of the sloped portion, when the ring member is stored in the first storage space, it is necessary to adjust the position of the tip portion of the male joint structure to return a predetermined distance toward the insertion opening. It can also be used as a guideline for positioning at that time.

In addition, in the second storage space, the radial tip of the rubber packing abuts against the side surface of the truncated cone in cross section. remain stable. In addition, the joint part as a whole forms a two-stage cylindrical cross-section with the slanted portion sandwiched therebetween, so that the slanted portion functions to prevent the male joint structure from slipping off toward the bell mouth portion and to provide the first storage space. It has a positioning function when arranging a ring member for locking, and can distribute the load on the female joint structure when an earthquake occurs. At this time, the structure of the slanted portion may be substantially straight in the direction of the tube axis, or may be a convex curved surface shape or a concave curved surface shape. Has a dispersing effect.

In addition, each part of the female joint structure is formed by molding or cutting from a cylindrical member made of a hard material having a two-stage cylindrical cross section, and a partition wall is formed in a direction perpendicular to the pipe axis direction. It is possible to obtain a highly accurate female joint structure having unprecedented structural features. In addition, the partition portion has a rib shape protruding inward, and has a function of partitioning the space of the expanded portion and a function of improving strength. In addition, at least a wall perpendicular to the pipe axis direction or a sharp cross section is not formed on the outer periphery of the pipe of the expanded diameter portion, so that when concrete is poured, the concrete can be well wrapped, It is difficult for air pockets to occur.

In addition, the inner surface of the second storage space forms a truncated cone in cross section that gradually expands toward the end, and the radial tip of the rubber packing comes into contact with the inner surface of the truncated cone in cross section. The function is stable and maintained. In addition, when the inner surface of the second storage space has a truncated cone shape that expands outward, the male joint structure can be easily inserted into the joint component. In addition, even when the outer circumference of the second storage space has a cross-sectional truncated cone shape that expands substantially parallel to the inner circumference, the thickness of the outer circumference of the second storage space is set to a predetermined value as the second enlarged diameter portion. Since the thickness can be maintained, the member strength of the second storage space can be maintained. In addition, when the cross section of the second expanded portion is wedge-shaped, it becomes easier to obtain a flat surface at the end by ensuring the thickness of the opening, and it becomes easy to fix to the formwork when manufacturing the manhole. . Furthermore, when an earthquake occurs, when a load is applied from the female joint side to the bell mouth side, the second enlarged diameter portion also bears the load, so that the load on the slope portion can be reduced. Further, by forming the second enlarged diameter portion, the outer periphery of the second enlarged diameter portion has a substantially truncated conical shape, which has an effect of preventing the joint member from coming off.

In addition, since the joint part is formed of a hard resin material such as hard polyvinyl chloride, ABS resin, PET resin, PC resin, glass fiber reinforced thermoplastic resin, etc., and the cylindrical groove is processed by cutting the partition part. , can be manufactured with high precision within a cylindrical space of 2 mm or more and 5 mm or less. Therefore, the size of the joint component can be reduced. In particular, hard vinyl chloride resin is preferred.

In addition, at least one of the end face of the opening at the tip of the female joint structure for connecting with the flexible conduit of the joint component and the end face of the opening at the tip of the bell mouth structure is formed flat. When placing concrete, the adhesion between the end portion and the formwork is improved, and leakage of concrete can be suppressed.

Furthermore, by arranging the elastic body at the end of the joint part, it can function as a packing between the formwork when placing concrete. Therefore, it is possible to more reliably suppress leakage of concrete between the formwork and the joint component. When the end portion of the joint component is a flat surface, it is particularly easy to dispose the elastic body, and concrete leakage can be prevented more reliably.

In addition, by attaching the water stop member annularly to the outer peripheral surface of the joint part at a predetermined position on at least a part of the outer peripheral surface of the joint part, the water stop of the gap between the concrete and the outer surface of the joint part can be improved. .

Further, by adhering sand annularly to at least a part of the outer peripheral surface of the joint part at a predetermined position so as to surround the outer peripheral surface in the circumferential direction, it is possible to increase the adhesion between the concrete and the outer surface of the joint part. Here, the sand may be applied to a part of the entire length of the outer peripheral surface, or may be applied to the entire length.

In addition, by printing the nominal diameter of the connected flexible conduit on at least one of the inner surface of the female joint structure for connecting with the flexible conduit and the inner surface of the bell mouth structure, The type can be easily grasped. Usually, joint parts are distinguished by printing the product name on the outer peripheral surface of the joint part. I can't get it. For this reason, by printing on the inner surface of the joint component, it is possible to prevent confusion or the like when connecting conduits or passing cables.

The first invention can obtain the effects described above by embedding it in a wall such as a manhole. .

A second aspect of the present invention is a manhole or handhole and a flexible wire using the wall-embedded flexible electrical conduit fitting according to the first invention. A pipe connection structure, wherein the wall-embedded flexible conduit joint component is embedded in the wall surface of a manhole or a handhole, and the male joint structure of the flexible conduit has the male joint structure. is inserted into the female joint structure of the joint component to connect the female joint structure and the flexible conduit. It is a connection structure with

The male joint structure includes a ring member placement portion for placing a ring member as a locking member, a water stop member placement portion formed closer to the opening than the ring member placement portion, and the ring member placement portion. and a rubber packing arranged in the waterproof member arrangement portion, and the ring member has a substantially C-shaped or annular shape with an open end in the circumferential direction. It is a member that is separate from the locking claw that expands outward toward the tip of the ring member toward the inner side in the tube axis direction and the locking claw that has a slide guide function parallel to the pipe axis direction. It has claws, the two claws are arranged alternately in the circumferential direction, the ring member is housed in the first housing space of the joint part, and the second housing space contains: The rubber packing may be accommodated. The ring member is usually made of resin or metal.

For example, the annular ring member arranged in the ring member arrangement portion can be obtained by providing connecting portions at both ends of a C-shaped ring member and connecting them to each other. The connecting portion may be provided with a number of serrated grooves.

A ring portion of a ring member serving as a locking member is disposed on the circumferential surface of the first housing space of the female joint structure, and the ring member is substantially C-shaped with an open distal end in the circumferential direction. The locking claw of the ring member extends from the ring portion toward the tip of the claw portion so as to decrease in diameter obliquely inward with respect to the innermost side in the tube axial direction. and when the male joint structure is connected to the female joint structure, the locking pawl is fixed to the locking pawl locking portion of the male joint structure, and the male joint A rubber packing arranged in a waterproof member arrangement portion formed behind the structural portion may be housed in the second housing space of the female joint structural portion.

The engaging claw of the substantially C-shaped or annular ring member serving as the engaging member has a diameter that decreases obliquely inward from the ring portion of the ring member toward the distal end of the claw portion with respect to the innermost side in the tube axial direction. The ring portion of the ring member may be fixed by elastic contact or adhesion so as to come into contact with the circumferential surface of the first storage space.

For example, when the ring member is C-shaped, the ring member is accommodated in the first storage space by reducing its diameter, and elastic recovery of the ring member is performed on the circumferential surface of the first storage space. It may be elastically contacted so as to contact with force, or if the ring member is annular, a ring member having a predetermined size that can be stored in the first storage space is attached to the inner surface of the first storage space. You may fix by adhesion|attachment. Examples of adhesives used for bonding include nitrile rubber, urethane rubber, cyanoacrylate, acrylic containing reactive acrylic resin, vinyl chloride solvent adhesive, ethylene vinyl acetate adhesive, and others. can be appropriately selected from the adhesives of

A plurality of short arc-shaped rings obtained by cutting the ring member as a locking member into predetermined lengths at predetermined positions in the circumferential direction are provided on the circumferential surface of the first housing space of the female joint structure. A predetermined number of divided members of the member are attached to the circumferential surface at predetermined intervals in the circumferential direction, and when the male joint structure is connected to the female joint structure, a plurality of members are attached. The locking pawl of the divided body is fixed to the locking pawl locking portion of the male joint structure, and a rubber packing is disposed in the waterproof member placement portion formed behind the male joint structure. It may be housed in the second housing space of the female joint structure.

In addition, a plurality of short arcuate ring members obtained by cutting the ring member to a predetermined length at predetermined positions in the circumferential direction are divided on the circumferential surface of the first housing space of the female joint structure. By attaching a predetermined number of bodies to the circumferential surface at predetermined intervals in the circumferential direction, it is possible to obtain the same effect as an integrated ring member.

When the male joint structure is connected to the female joint structure, the locking claws of the plurality of divided bodies are fixed to the locking claw locking portions of the male joint structure. A similar effect can be obtained by housing the rubber packing arranged in the waterproof member arrangement portion formed behind the male joint structure in the second housing space of the female joint structure. .

As a plurality of split pieces of short arcuate ring members, the arcuate portion and the arcuate portion are reduced in diameter from the arcuate portion toward the tip of the claw portion obliquely inwardly with respect to the inner side in the tube axial direction. It may have a claw portion extending so as to extend, or the arc-shaped portion and the claw portion may be integrated, and the divided body in which the arc-shaped portion and the claw portion are integrated Alternatively, the cross section of the split body cut in the center direction may be substantially triangular. For example, the divided body having the extended claw portion can be made of metal or resin, and the divided body in which the arc-shaped portion and the claw portion are integrated can be made of rubber.

A second embodiment of the second invention provides a manhole or handhole and a flexible wall-embedded flexible conduit joint part using the wall-burying flexible conduit joint part according to the first invention. A connection structure for a flexible conduit, wherein the wall-embedded flexible conduit joint part is embedded in the wall surface of a manhole or a handhole, and the male joint structure for a flexible conduit has the male joint structure. is inserted into the female joint structure of the joint component to connect the female joint structure and the flexible electric conduit, and the female joint structure includes two A locking member having a locking pawl for locking the male joint structural portion at a predetermined position inside the inner peripheral surface of the space of the substantially cylindrical cross section of the enlarged diameter portion of the cylindrical member having a stepped cylindrical cross section. is directly adhered and fixed to lock the male joint structure inside the female joint structure, and furthermore, the male joint structure is separated from the position where the locking member is adhered and fixed toward the opening by a predetermined distance. A manhole or hand using a wall surface-embedded flexible conduit joint part, characterized in that a water stop member is arranged at a predetermined position of the joint structure to stop water between the female joint structure and the male joint structure. It may be a connection structure between a hole and a flexible conduit. Here, in the present invention, unlike the first embodiment, a first storage space is formed by cutting inside the substantially cylindrical space of the enlarged diameter portion of the cylindrical member having a two-stage cylindrical cross section. It is characterized in that the diameter member is directly adhered to the interior of the space of the enlarged diameter portion, which has a substantially cylindrical cross section, without forming a second storage space. For example, in a connection structure between a manhole or a handhole and a flexible cable conduit, the locking member is directly bonded and fixed to the inner side of the enlarged diameter portion, and the water stop member is arranged on the opening side of the locking member. There may be.

The ring portion of the locking member is fixed to the cylindrical surface of the female joint structure, and the locking claw of the locking member is obliquely inward from the ring portion toward the tip of the claw portion with respect to the inner side in the pipe axis direction. When the male joint structure is connected to the female joint structure, the locking claw engages the male joint structure. The rubber packing fixed to the pawl locking portion and arranged in the waterproof member arrangement portion formed behind the male joint structure is not directly accommodated in the inner surface of the female joint structure, but is cut. It may be accommodated in a groove having a substantially cylindrical cross section formed by machining.

Here, since the joint member has a two-step substantially cylindrical slanted surface, the front end of the male joint structure is brought into contact with the slanted surface so that the bellmouth side opening of the male joint structure can be adjusted. When the locking claw locking portion of the male joint structure is locked to the locking claw of the locking member, the locking claw is returned to the opening side by a predetermined distance from the slope portion. can be fixed to the locking pawl fixing portion, and a positioning effect can be imparted.

In addition, in the joint component in which the engaging member is adhered to the expanded diameter portion of the cylindrical member having the two-stage substantially cylindrical shape, if the joint structure is provided on the expanded diameter portion side, the main body on the other side The portion may be simply cylindrical in shape.

Here, the main body portion of the flexible electric conduit according to the second invention has a helical waveform, a waveform having an independent wave structure, or a large diameter portion having a substantially rectangular cross section and a small diameter portion having a circular cross section, which are alternately formed. or a double-walled conduit in which an inner tube is fused to a small diameter portion of the rectangular conduit. That is, there are no particular restrictions on the shape of the main body.

A third invention is a connection structure between a manhole or a handhole and a flexible conduit using the wall-embedded flexible conduit joint component and the joint member according to the first invention,
The joint member has the male joint structure of the flexible conduit at one end, and has a structure connected to the cut surface of the flexible conduit at the other end,
the female joint structure portion of the wall-embedded flexible conduit joint part and the male joint structure portion of the joint member are connected to each other;
The flexible conduit connected to the other end of the joint member is a flexible conduit in which a large diameter portion having a substantially rectangular cross section and a small diameter portion having a circular cross section are alternately formed in a body portion,
A manhole characterized in that the cut portion of the small diameter portion of the flexible conduit is connected to a structure of the other end portion of the joint member that is connected to the cut portion of the small diameter portion of the flexible conduit. Alternatively, it is a connection structure between a handhole and a flexible conduit.

The cut portion of the other small-diameter portion of the flexible electric conduit connected to the joint member and the cut portion of the small-diameter portion of the other flexible electric conduit are cut so that the tubular portion of the joint member is formed on both sides. You may connect with the pipe joint which connects parts.

The main body portion of the flexible electric conduit may be a square electric conduit in which large-diameter portions having a substantially rectangular cross-section and small-diameter portions having a circular cross-section are alternately formed.

The main body of the flexible conduit is a double-walled rectangular conduit, in which a large diameter section with a substantially rectangular cross section and a small diameter section with a circular cross section are alternately formed, and an inner tube is fused to the inner side of the small diameter section. may be

According to the third aspect of the invention, the manhole or handhole can be connected to the flexible electric conduit simply by inserting the male joint structure into the female joint structure.

Here, the ring member of the male joint structural portion is a substantially C-shaped member with an open distal end in the circumferential direction, and expands outward toward the distal end of the ring member with respect to the inner side in the tube axial direction. By providing the locking pawl that opens, it is possible to easily engage and connect with the partition portion of the female joint structure. At this time, by forming pawls that function as slide guides parallel to the pipe axis direction and alternately arranging the locking pawls and the slide guides in the circumferential direction, the slide guides change the male joint structure to the female type. It can be stably inserted into the joint structure.

Further, the ring member can be formed in an annular shape by providing connecting portions at the ends of the ring member in the circumferential direction and connecting the connecting portions. By forming the ring member in an annular shape in this manner, it is possible to prevent the ring member from falling off from the ring member placement portion and to smoothly slide the ring member on the ring member placement portion.

Further, when the ring member is attached to the male joint structure, the locking claw is housed in the first housing space, and the tip of the locking claw is attached to the side surface of the cross-sectionally reduced portion of the partition having a cylindrical cross section. By abutting on the , it will not come off even if a pull-out force is applied from the outside.

In addition, by using a joint member having a male joint structure portion of a flexible electric conduit at one end and a structure connected to a cut surface of the flexible electric conduit at the other end, a manhole or a hand can be A connection structure between the hole and the cut flexible conduit can be obtained.

Furthermore, by connecting the other cut surface of the flexible electric conduit connected to the joint member and the cut surfaces of the other flexible electric conduit with a pipe joint, the cut flexible electric conduits are connected to each other. A conduit can be formed.

Such a flexible electric wire tube may be a rectangular electric wire tube in which a large diameter portion having a substantially rectangular cross section and a small diameter portion having a circular cross section are alternately formed. Further, it may be a double-walled rectangular electric conduit in which an inner tube is fused to the inner side of the small-diameter portion. Thus, any form of flexible conduit can be connected.

A fourth invention is a network of conduits of flexible conduits using the connection structure for manholes or handholes and flexible conduits according to the second invention, comprising a plurality of manholes or handholes and a flexible conduit. A network of conduits of flexible conduits, characterized in that connecting structures with conduits are combined.

According to the fourth aspect of the invention, it is possible to obtain a conduit network of flexible electric conduits in which the connection between the female joint structure and the male joint structure is easy, and which can be easily constructed in a short period of time.

A fifth aspect of the invention is a connection structure of a connecting portion in a wall of a manhole or a handhole using the wall-embedded flexible conduit joint component according to the first aspect of the invention, wherein the wall-embedded flexible conduit joint Connection of manhole or handhole wall connection characterized in that parts are embedded in the manhole or handhole wall connection part in an aligned state using a tube pillow material that allows a plurality of parts to be arranged. Structure.

According to the fifth invention, it is possible to easily form the connection structure of the connecting portion of the wall of the manhole or handhole.

A sixth aspect of the invention is a method for constructing a subsidence-type manhole or handhole using the connection structure of the wall connection portion of the manhole or handhole according to the fifth aspect, wherein the manhole or handhole having the connection structure is formed. After covering the opening of the connecting part with a cap for preventing the intrusion of earth and sand, the manhole or handhole is buried in the ground by excavating the earth and sand. A subsidence-type manhole or handhole construction method characterized by placing concrete in the bottom of an opening.

According to the sixth invention, the manhole or handhole can be easily installed. At this time, since the joint part does not protrude from the wall, the joint part will not be damaged during sinking.

In a seventh invention, the male joint structure part of the flexible conduit is attached to the connection part of the subsidence-type manhole or handhole constructed by the subsidence-type manhole or handhole construction method according to the sixth invention. A method for connecting a flexible conduit to a submerged manhole or handhole, characterized by inserting and connecting a flexible conduit.

According to the seventh invention, both can be easily connected simply by inserting the male joint structure portion of the flexible electrical conduit into the connection portion of the manhole or handhole.

An eighth invention is a method for manufacturing a wall-embedded flexible conduit joint component according to the first invention, wherein a hard vinyl chloride extruded tube is used as a base pipe, and the base pipe is heated to a predetermined temperature and thermoformed. After the diameters of the bell mouth portion, the slope portion, and the enlarged diameter portion are expanded and molded, the inner surface of the enlarged diameter portion is cut to hold the first housing at a predetermined position sandwiching the partition portion having a cylindrical cross section. By forming the space and the second storage space, the female joint structure for connecting with the flexible conduit is formed, and the female joint structure is excellent in dimensional accuracy and load resistance. A method for manufacturing a wall surface-embedded flexible conduit joint component.

According to the eighth invention, the female joint structure can be formed with high accuracy. In addition, since the outer surface can be formed into a gently curved surface, and no step or the like protruding in the radial direction is formed, the concrete can flow well when the concrete is placed.

According to the present invention, it is used by being embedded in the wall of a manhole or handhole in advance, and the connecting portion of the manhole or handhole and the flexible conduit can be connected with one touch, and at that time, the cross-sectional area of the parts can be reduced. A flexible conduit joint part for wall-burying, which can be densely arranged at the connection part and can improve the pourability of concrete, a connection structure between a manhole or a handhole and a flexible conduit, and a flexible Conduit conduit network, manhole or handhole wall connection structure, construction method of submerged manhole or handhole, method of connecting flexible conduit to submerged manhole or handhole, wall surface A method of manufacturing an embedded flexible conduit fitting component can be provided.

(a) is a cross-sectional view of the joint component 1, and (b) is an enlarged view of part A of (a). (a) is a cross-sectional view of the joint component 1a, (b) is an enlarged view of the C part of (a), and (c) is a wedge-shaped cross-sectional shape of the second enlarged diameter part of the joint component 1b. Enlarged view of the same part. 4(a) to 4(c) are diagrams showing a manufacturing process of the joint component 1a. FIG. (a), (b) is a figure which shows the manufacturing process of the structure of a manhole or a handhole. (a), (b) is a figure which shows the manufacturing process of the structure of a manhole or a handhole. (a), (b) is a figure which shows the manufacturing process of the structure of a manhole or a handhole. (a) is a diagram showing a state in which an elastic body 33 is provided on a joint component 1a, and (b) is a diagram showing a state in which a waterproof member 35 is provided on the joint component 1a. The figure which shows the state which attached the sand 102 to a part of outer peripheral surface of the joint component 1a. 4(a) to 4(c) are diagrams showing a sinking process of a manhole 40. FIG. (a) is a side view showing the flexible cable tube 50, and (b) is a cross-sectional view taken along line EE of (a). (a) is a cross-sectional view showing a male joint structure 51, and (b) is a cross-sectional view showing a male joint structure 51 of another flexible conduit. (a) is a perspective view showing a ring member 53, and (b) is a perspective view showing a ring member 53a. (a), (b) is a figure which shows the process of connecting the male type|mold joint structure part 51 and the female type|mold joint structure part 11. FIG. (a) is a side view showing a flexible electric wire tube 50a, and (b) is a side view showing a flexible electric wire tube 50b. 4 is a perspective view showing a joint member 80; FIG. (a), (b) is a figure which shows the process of connecting the joint member 80 and the flexible electric wire tube 50. FIG. The figure which shows the connection structure 70a. FIG. 2 shows a conduit network 100; (a), (b) is a figure which shows the process of connecting the male joint structure part 51a and the female joint structure part 11a of the joint component 1c. (a), (b) is a figure which shows the process of connecting the male joint structure part 51a and the female joint structure part 11b of the joint component 1d. (a), (b) is a figure which shows the process of connecting the male joint structure part 51a and the female joint structure part 11c of the joint component 1e.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1(a) is a cross-sectional view of the joint component 1 in the pipe axis direction, and FIG. 1(b) is an enlarged view of part A in FIG. 1(a). The joint part 1 is a member having a female joint structure 11 that can be embedded in the wall surface of a manhole or handhole and can be used without protruding from the wall surface. That is, the joint component 1 is a wall surface-embedded flexible conduit joint component.

The joint component 1 is a tubular member made of a hard resin material. The hard resin material is selected from, for example, at least one of hard vinyl chloride, ABS resin, PET resin, PC resin, and glass fiber reinforced thermoplastic resin, and hard vinyl chloride is particularly desirable.

Here, the specific gravity of hard vinyl chloride is 1.35 to 1.45, which is a very light material and easy to handle. In addition, the strength of hard vinyl chloride is comparable to that of soft aluminum, so it has sufficient mechanical strength against internal and external pressure, bending, impact, and the like. Hard vinyl chloride also has excellent chemical resistance and is not immersed in most acids, alkalis, salts, and the like. Thus, rigid vinyl chloride is the most suitable material.

The mechanical properties of rigid vinyl chloride are a tensile breaking strength of 415 to 527 kg/cm2, a tensile yield strength of 415 to 457 kg/cm2, and a tensile modulus of elasticity of 2.46 to 4.22 GPa. In addition, the mechanical properties of hard vinyl chloride pipes show properties close to those of vinyl chloride homopolymers (tensile modulus: 2.8 GPa, tensile yield strength: 55 MPa) because the content of plasticizer is small. . In addition to PVC pipes, applications of rigid PVC include corrugated plates, flat plates, films and sheets, profile extrusions, electric wires, and others.

When hard vinyl chloride is used as the material of the joint part 1, for example, VP pipe, VU pipe, HIVP pipe described in JISK 6741 (2016), VE pipe described in JIS C 8430 (2019), C.I. C. BOX pipeline system study group standard CCB E001-2 (2011) electric wire common trench power conduit material CCVP, C.I. C. BOX pipeline system study group standard CCB E003-1 (2018) electric wire common trench power conduit material ECVP, C.I. C. A conduit material PV pipe for electric wire common trench one-line communication described in BOX Pipeline System Study Group Standard CCB C001 (2011) may be used as appropriate. Further, although the details will be described later, when the female joint structure 11 is formed by cutting, a thick VP pipe, HIVP pipe, CCVP, ECVP, PV pipe is more preferable. For example, according to JISK6741:2016, the strength (tensile yield strength) of VP pipes and VU pipes is 45 MPa or more. In the case of HIVP tubes for impact use, the tensile yield strength is specified to be 40 MPa or more.

By using a hard resin material for the joint part 1 in this way, the reaction heat and weight of concrete can be endured during the manufacture of the joint part, which will be described later, and the construction of the joints of manholes and handholes. Thus, hard resin materials are desirable from the viewpoint of strength, heat resistance, and cost.

A bell mouth portion 3, a body portion 5, a slope portion 7, and an enlarged diameter portion 9 are formed in order from one end to the other end of the joint component 1 (from the left side to the right side in the figure). . The body portion 5 has a substantially cylindrical outer shape for inserting an electric wire or a cable. The slope portion 7 is formed at a portion transitioning from the body portion 5 to the enlarged diameter portion 9 . The enlarged diameter portion 9 is arranged adjacent to the slope portion 7 and is a portion having an inner diameter enlarged from that of the main body portion 5 . The bell mouth portion 3, the main body portion 5, and the enlarged diameter portion 9 all have substantially cylindrical outer shapes. The slope portion 7 is a portion whose outer shape expands in a substantially conical shape.

The open end of the bell mouth portion 3 is larger in diameter than the body portion 5 . It is desirable that the inner surface of the bell mouth portion 3 has a curved cross-sectional shape in the tube axial direction in order to prevent the cable from being damaged during wiring. If the radius of curvature of the inner curved surface of the bell mouth portion 3 is small, when the connected flexible conduit is pulled outward from the connecting portion due to an earthquake or the like, stress is applied locally to the joint parts. easily damaged. For this reason, the radius of curvature of the curved inner surface of the bell mouth portion 3 is desirably greater than a predetermined value, for example, 15 mm or more, in consideration of the stress dispersion effect at that time.

The diameter of the opening of the bell mouth portion 3 is not particularly limited, but if the opening is too wide, the flexible electrical conduits cannot be densely arranged. In addition, if the diameter of the opening of the bell mouth portion 3 is too narrow, it will be difficult to obtain the effect of cable protection during wiring. The flexible conduit can pull out of the connection when the part is pulled outward. Therefore, it is desirable that the outer diameter of the opening of the bell mouth portion 3 is 0.9 to 1.1 times the outer diameter of the female joint structure 11 (enlarged diameter portion 9).

The outer shape of the cylindrical member extending from the bell mouth portion 3 to the enlarged diameter portion 9 has a cylindrical cross section with two different outer diameters. Further, the slope portion 7 has a slope structure in which the pipe inner diameter and the pipe outer diameter gradually increase from the main body portion 5 toward the enlarged diameter portion 9 in the pipe axial direction.

In this way, by providing the main body portion 5 and the enlarged diameter portion 9 in two stages, the stress applied to the joint part 1 when the connected flexible conduit is pushed inward by an earthquake or the like can be reduced to the external dimensions. can be distributed over the entire circumference of the circumferential surface in the pipe axial direction of the joint member and in the direction perpendicular to the pipe axial direction. Moreover, when manufacturing the joint component 1 by cutting, it is easy to secure thickness.

It should be noted that at least a wall perpendicular to the axial direction of the tube or an acute-angled cross section is not formed on the outer peripheral surface of the tube of the expanded diameter portion 9 . For example, the outer peripheral surface of the joint component 1 is composed of a surface parallel to the pipe axis direction and a gentle slope. In this way, when the main body portion 5 and the enlarged diameter portion 9 are provided in two stages, the inclination angle of the inclined surface portion 7 with respect to the pipe axial direction is preferably 5 to 45°. If the inclination angle of the slope portion 7 with respect to the tube axis direction is 5° or less, it is difficult to obtain the effect of two stages. Further, when the inner angle of inclination of the slant portion 7 with respect to the pipe axis direction exceeds 45° and the outer dimension is increased, the joint component 1 cannot be densely arranged in a manhole or a handhole. Here, if the inner angle of the slanted portion is larger than 45°, the workability and stress dispersion effect of the joint part due to the slanted portion are reduced. The setting performance of is lowered. The internal angle of the inclined portion is desirably 30° or less and 10° or more.

A female joint structure 11 is formed on the inner surface of the cylindrical space of the enlarged diameter portion 9 . The female joint structure portion 11 has a first storage space 13, a partition portion 15, and a second storage space 17 formed in order from the inside of the joint component 1 toward the opening at the other end. The first storage space 13 and the second storage space 17 are two spaces having a substantially cylindrical cross section with a predetermined width, which are partitioned by a partition portion 15 protruding inwardly of the pipe so as to reduce the diameter. The partition part 15 is not formed by protruding from the first storage space 13 and the second storage space 17, but by forming grooves on the inner surface of the cylindrical shape by cutting. A partition portion 15 projecting inward of the pipe is formed as a portion having a small amount. At this time, the side wall of the groove serves as an engagement portion for the ring member, or the groove surface serves as an attachment portion for the ring member. Although not shown, the partitioning portion 15 is formed by cutting a groove to form a non-cutting portion as the partitioning portion. It can also be formed by sticking a shaped member.

Although the details will be described later, the female joint structure 11 is connected to the male joint structure of the flexible conduit. In this case, the tip of the male joint structure abuts against the inner wall of the slanted surface 7, so that the slanted surface 7 functions to prevent the male joint structure from coming off. Further, the first housing space 13 is a portion capable of housing a ring member for locking the male joint structure, and the second housing space 17 houses the packing of the male joint structure. It becomes possible part. Here, in the first housing space 13, either the locking pawl or the ring portion of the locking member is housed, depending on the structure of the male joint structure. That is, in the female joint structure 11, a locking member for locking the male joint structure and a packing for stopping water between the female joint structure 11 and the male joint structure are provided. They can be accommodated at a predetermined distance from each other toward the opening from the back side of the inner peripheral surface of the cylindrical space.

The height of the diameter-reduced portion (B in FIG. 1B) of the partition portion 15 is 2 mm or more and 5 mm or less, preferably 2 mm or more and 4 mm or less, and more preferably 2 mm or more and 3 mm or less. That is, since it is necessary to consider the difference in height in the vertical direction with respect to the inner diameters of the first storage space 13 and the second storage space 17, the inner diameter of the partition part 15 is 10 mm with respect to the maximum inner diameter of the storage space. It is preferably less than 8 mm, and more preferably less than 6 mm. Since the height of the partition 15 is half the inner diameter of the partition 15, it is 2 to 5 mm as described above, but the height of the partition 15 is more preferably 2 to 3 mm. It is more desirable that the difference in the inner diameters of the corresponding storage spaces is 4 to 6 mm or less. When the height of the partition part 15 is increased, the thickness of the first storage space 13 and the second storage space 17 is reduced, and the joint component 1 is easily damaged. In addition, at this time, the outer dimensions of the joint part 1 also become large, and it becomes impossible to arrange it densely at the connecting portion of the manhole or handhole. Conversely, if the height of the partition portion 15 is reduced, it becomes easier to arrange densely in the connection portion of the manhole or handhole, but on the other hand, it becomes difficult for the locking claw of the locking member to engage with the first storage space 13 . When molding by blow molding or vacuum extrusion molding, the step on the inner surface of the joint part always has a curvature. , the step becomes a beautiful rectangle, and the locking claw of the locking member can be easily caught. Thereby, even if the height of the partition portion 15 is as small as 2 mm, the locking claw of the locking member is sufficiently locked. The desired height of the partition is the same whether the partition is formed by attaching a sheet-like member or by cutting.

At least one of the inner surface of the female joint structure portion 11 for connecting with the flexible electric conduit of the joint part 1 and the inner surface of the bell mouth portion 3 has a nominal diameter of the flexible electric conduit to be connected. It may be printed. By doing so, it is possible to easily grasp the size of the flexible conduit to be connected. It should be noted that, if there is unevenness in the printing, there is a concern that the function of the female joint structure 11 and problems in cable routing may occur.

FIG. 2 shows a case where the joint component 1a has a second enlarged diameter portion. Further, a second enlarged diameter portion may be formed at the tip of the enlarged diameter portion 9 to further expand. FIG. 2(a) is a cross-sectional view of the joint component 1a, and FIG. 2(b) is an enlarged view of part C of FIG. 2(a). The joint component 1a has substantially the same configuration as the joint component 1, but differs in that a second enlarged diameter portion 9a having a diameter larger than that of the enlarged diameter portion 9 is formed on the opening side of the enlarged diameter portion 9. .

In the joint component 1 described above, the second storage space 17 is formed in a substantially cylindrical cross section. The outer peripheral surface of the second enlarged diameter portion 9a is formed to have a cylindrical cross section in which a cylindrical cylindrical portion gently widens outward at a predetermined angle θ. That is, in the joint component 1a shown in FIG. 2(b), in addition to the outer periphery of the expanded diameter portion, the inner peripheral surface forming the second storage space 17 is also substantially parallel to the outer peripheral surface, and the cylindrical cross section extends outward toward the tip. It is formed into a cylindrical cross section that gently widens at a predetermined angle θ toward the edge.

Moreover, FIG.2(c) shows the elements on larger scale of the part similar to the C section of the joint component 1b. A cross section showing the overall structure of the joint component 1b is omitted because it has the same structure as in FIG. 2(a) except for the portion shown in FIG. 2(c). As shown in FIG. 2(c), on the outer periphery of the second enlarged diameter portion of the joint part 1b, a cylindrical cylindrical portion gently expands outward at a predetermined angle θ, similar to the joint part 1a. Although it is formed in a cylindrical cross section, the inner peripheral portion of the second enlarged diameter portion of the joint part 1b is substantially parallel to the enlarged diameter portion or on an extension line of the inner peripheral portion of the enlarged diameter portion and has the same inner diameter as the enlarged diameter portion. , and the second enlarged diameter portion 9b is formed to have a wedge-shaped cross section by widening the outer periphery of the second enlarged diameter portion at a predetermined angle.

Thus, since the joint component 1a has the second enlarged diameter portion 9a, the inner surface of the second storage space 17 has a truncated conical cross section. In addition, the outer circumference of the second storage space 17 also has a truncated conical cross-sectional shape that expands substantially parallel to the inner circumference. Since the joint component 1b has the second enlarged diameter portion 9b with a wedge-shaped cross section, the inner surface of the second storage space 17 has a cylindrical cross section. By doing so, in the joint component 1b, the wall thickness of the outer peripheral portion of the second storage space 17 can be maintained, and the member strength of the portion of the second storage space 17 can be maintained. In the joint component 1b, since the wall thickness of the end portion of the joint component can be increased, the member strength of the joint component 1b can be improved. Furthermore, it becomes easier to fix the joint member to the formwork, and at the same time, it is possible to improve the water cut-off property when placing concrete. In either case, since the outer peripheral portion gently expands at a predetermined angle, it has an effect of preventing slippage in the direction of the bell mouth and an effect of reducing the load applied to the slope during an earthquake or the like.

Also in this case, the height of the diameter-reduced portion by the partitioning portion 15 (D in FIG. 2B: step) is preferably 2 mm or more and 5 mm or less, and more preferably 2 mm or more and 4 mm or less. In this case, the inner diameter of the first storage space 13 and the inner diameter of the smallest inner diameter portion of the second storage space 17 (that is, the portion close to the partition 15), the inner diameter of the partition 15 is 10 mm or less, further 8 mm can be:

Further, the diameter expansion angle of the second diameter expansion portion 9a with respect to the pipe axis direction (the angle θ in FIG. 2B, which is the diameter expansion slope angle with respect to the pipe axis direction) is preferably 1° or more and 10° or less. desirable. If the diameter expansion angle of the second diameter expansion portion 9a is less than 1°, the effect is insufficient. become unable.

Here, the outer peripheral surface of the second enlarged diameter portion 9a is a cylindrical cylindrical portion that gently expands outward at a predetermined angle. The diameter may be increased, or the outer peripheral surface of the second enlarged diameter portion 9a may be formed in a substantially cylindrical shape with the same diameter. In addition, the inner periphery of the second enlarged diameter portion 9a expands gently at a predetermined angle toward the tip substantially parallel to the outer periphery of the second enlarged diameter portion 9a, or has the same size as the inner periphery of the enlarged diameter portion 9a. It may be formed either That is, the inner peripheral surface of the second enlarged diameter portion 9a can be formed into a cylindrical shape having the same diameter as the inner peripheral surface of the enlarged diameter portion 9 with the partition portion 15 interposed therebetween.

By forming the second enlarged diameter portion 9a in this way, the inner peripheral surface side of the second enlarged diameter portion 9a has the same structure as the inner peripheral surface in FIG. 1, and the outer peripheral surface side has a conical shape. It can also have a shape that expands at a predetermined angle within 1° to 10°. With such a structure, it is possible to obtain the effect of preventing slippage from manholes and handholes when an external force acts and the effect of dispersing stress, and it is possible to disperse the stress acting on the slope. At this time, the inner peripheral surface of the second enlarged diameter portion 9a is processed so that the inner peripheral surface of the gently expanded pipe is formed into a substantially right triangle shape from the partition portion toward the end portion of the joint member on the second enlarged diameter portion side. It is done by cutting.

Next, a method of manufacturing a joint component for a wall-embedded flexible conduit will be described. In the following description, the joint component 1a will be explained, but the same applies to the joint components 1 and 1c. FIG. 3 is a diagram showing a manufacturing process of the joint component 1a.

First, as shown in FIG. 3(a), an extruded tube made of a hard resin material such as hard vinyl chloride is cut to a predetermined length to form a blank tube 19. As shown in FIG. Next, as shown in FIG. 3(b), the blank pipe 19 is heated to a predetermined temperature, and the bell mouth portion 3, the slope portion 7 and the enlarged diameter portion 9 (second enlarged diameter portion 9a) are expanded by thermoforming. Diameter and shape. The expanded diameter portion 9 and the bell mouth portion 3 can be expanded by locally heating the raw pipe 19 and inserting a die into the raw pipe 19 .

After that, as shown in FIG. 3(c), the inner surface of the enlarged diameter portion 9 is cut to form a first storage space 13 and a second storage space 17 at predetermined positions sandwiching a partition portion 15 having a cylindrical cross section. do. That is, the first housing portion formed on the cylindrical inner wall of the female joint structure portion 11 formed on the cylindrical inner surface of the enlarged diameter portion 9 of the cylindrical member whose outer peripheral surface is formed to have two different outer shapes. The space 13 and the second storage space 17 are formed by cutting recesses, respectively, and the partitioning portion 15 is formed by reducing the diameter of the uncut portion. Thus, the female joint structure 11 is formed by cutting.

In this way, the female joint structure 11 has a groove with a substantially cylindrical cross section formed by cutting at a predetermined position in a space with a substantially cylindrical cross section, and a partition part 15 that is not cut. As a result, the groove divides the space having a substantially cylindrical cross section into the first storage space 13 and the second storage space 17 by the partition portion 15 .

Here, both end surfaces of the joint component 1a may be cut. By doing so, on the end face of the opening at the tip of the female joint structure portion 11 for connecting with the flexible electric conduit of the joint part 1a and the end face of the opening at the tip of the bell mouth portion 3, Flat surfaces 21a and 21b are formed. The end face of the opening at the tip of the female joint structure portion 11 for connecting with the flexible electric wire tube of the joint part 1a and the end face of the opening at the tip of the bell mouth portion 3 are flat. Although it is desirable that both end faces are formed, both faces may not be flat as long as at least one of the end faces is formed flat. By making the both end faces flat, it becomes easier to fix to the formwork when manufacturing the manhole. Also, by cutting the end face, it is possible to precisely build the entire length, and when sandwiched between forms, excessive compression and intrusion of concrete into the joints are less likely to occur. In addition, it becomes easier to arrange the elastic body at the end.

As described above, the joint component 1a can be manufactured. At this time, the first storage space 13 and the second storage space 17 are formed in the inner peripheral surface of the cylindrical portion that forms the side surface of the cylindrical member by cutting, using a hard resin material as a raw material. 15. The processing accuracy of the height of 15 is high, and as a result, a storage space with a low height and high precision can be obtained. A female mold with a new structure that does not have protrusions or recesses that protrude in the direction perpendicular to the pipe axis on the outer circumference of the joint part, unlike when the joint part is molded by injection molding or blow molding. A joint component having a joint structure can be obtained. Therefore, the dimensional accuracy and load resistance of the female joint structure 11 for connecting with the flexible conduit are excellent. Furthermore, it is possible to place the device into a concrete member and to reduce the size of the device. In this way, it is possible to manufacture a wall-burying flexible conduit joint component having a female type joint structure portion 11 that is small in size, has excellent dimensional accuracy and load resistance, allows close arrangement, and is also excellent in concrete placing performance. can be done.

It should be noted that the enlarged diameter portion 9 may be first formed by thermoforming, the inner surface thereof may be machined to form the female joint structure portion 11, and then the diameter of the bell mouth portion 3 may be enlarged. Furthermore, the diameter expansion of the diameter expansion portion 9 may be performed in two steps. When the female joint structure portion 11 is secured by cutting, it is preferable to increase the diameter of the enlarged diameter portion 9 in two steps in order to secure the thickness. The female joint structure 11 can be attached by adhesion or the like in addition to cutting, but cutting is preferable in consideration of reduction in strength of the bonding surface and labor for processing.

Further, the joint member of the present invention is provided with the enlarged diameter portion 9 and, if necessary, the second enlarged diameter portion 9a. to allow connection with flexible conduits. For this reason, the main body portion 5 only serves to connect the enlarged diameter portion 9, the slope portion 7, and the bell mouth portion 3 and to insert and hold the flexible electric wire tube. The length shown in 1 is not necessarily required, and by shortening the body portion 5, the size of the joint member can be further reduced.

Next, a description will be given of a method of forming a connecting portion of a wall of a manhole or a handhole using the joint component 1a of the wall-burying flexible electric conduit. First, as shown in FIG. 4(a), the mold 23a is erected, and the core 25 is fixed on the inner surface side with bolts 27. As shown in FIG. Although only one center core 25 is shown in FIG. 4(a), a plurality of cores 25 are arranged at predetermined intervals. That is, the center core 25 can arrange a plurality of joint parts 1a.

Next, as shown in FIG. 4B, reinforcing bars 29 are arranged around the core 25 at predetermined intervals. Next, as shown in FIG. 5( a ), the joint component 1 a is attached to the core 25 . By setting the outer diameter of the core 25 substantially equal to the inner diameter of the joint component 1a, the joint component 1a can be positioned with high accuracy.

Next, as shown in FIG. 5B, a mold 23b is erected on the opposite side of the joint component 1a, and the joint component 1a is sandwiched between the molds 23a and 23b. At this time, since flat surfaces 21a and 21b (FIG. 3(c)) are formed on both end faces of the joint part 1a, the joint part 1a can be brought into close contact with the forms 23a and 23b without gaps. If the center core 25 is longer than the joint part 1a, a gap is formed between the joint part 1a and the forms 23a and 23b. do.

Next, as shown in FIG. 6(a), concrete 31 is placed between the forms 23a and 23b. Cement concrete, resin concrete, or the like may be used as the material of the concrete 31 . At this time, since no steps or partitions perpendicular to the pipe axis direction are formed on the outer peripheral surface of the joint part 1a, the concrete 31 easily flows around the outer periphery of the joint part 1a, forming an air pocket or the like. can be suppressed.

As described above, the flexible electrical conduit for wall-burying is embedded in the connecting portion of the wall of the manhole or handhole with the joint parts 1a aligned using the core 25 capable of arranging a plurality of the joint parts 1a. It is possible to obtain a connection structure of a connection in a wall of a manhole or a handhole using a joint part.

After the concrete 31 hardens, the forms 23a and 23b and the core 25 are removed as shown in FIG. 6(b). As described above, a structure in which the joint part 1a of the wall-burying flexible electric conduit is embedded in the wall surface of the manhole or handhole (concrete structure 30) can be constructed. At this time, since the wall thickness of the concrete and the length of the joint part 1a substantially match, the joint part 1a does not protrude from the concrete 31. As shown in FIG. In addition, the formation of the second enlarged diameter portion 9a has an effect of preventing slippage from the concrete 31 .

Here, as described above, at least one of the end face of the opening at the tip of the female joint structure 11 for connecting with the flexible conduit of the joint part 1a and the end face of the opening at the tip of the bell mouth portion 3 flat surfaces 21a and 21b are formed at the end faces of the . At this time, as shown in FIG. 7( a ), elastic bodies 33 may be attached to the flat surfaces 21 a and 21 b of the joint component 1 a before setting on the core 25 .

By attaching the elastic body 33 to the end face of the joint part 1a in this way, the formwork 23a, 23b can be brought into close contact with the molds 23a and 23b more reliably, and when the concrete 31 is placed, the concrete 31 will not enter the inside of the joint part 1a. become difficult. The elastic body 33 may be appropriately made of rubber material, foam material, or the like, and may be appropriately attached with an adhesive tape, an adhesive, or the like. Moreover, the elastic body 33 may be attached only to the end faces of the female joint structure 11 and the bell mouth part 3, or may be attached so as to cover the entire openings at both ends.

Further, as shown in FIG. 7(b), a waterproof member 35 may be adhered to at least a portion of the outer peripheral surface of the joint component 1a. By attaching the water stop member 35 to the outer circumference of the joint part 1a, it is possible to suppress groundwater from entering a manhole or the like. Note that the waterproof member 35 may be made of, for example, butyl rubber, water-swelling rubber, water-swelling nonwoven fabric, or the like as appropriate. The water stop member 35 may be attached to the entire outer circumference of the joint part 1a or may be attached to a part of the joint part 1a, but it is desirable that the water stop member 35 is attached so as to be connected to the entire outer circumference. When the water stop member 35 is not attached to the joint part 1a, the interface between the joint part 1a and at least one of the inner or outer wall of the manhole or the like may be filled with epoxy putty or the like for water stop treatment.

Further, as shown in FIG. 8, sand 102 may be annularly attached to at least a part of the outer peripheral surface of the joint component 1a so as to surround it in the circumferential direction. By applying the sand 102, the adhesion between the wall of the manhole and the outer peripheral surface of the joint part 1a can be improved. As the sand 102, for example, silica sand or the like may be appropriately used. Attaching the sand 102 means fixing the sand 102 to the outer peripheral surface of the joint part 1a by adhesion, and the adhesion of the sand 102 is performed by adhesive tape or the like. It may be properly attached with an adhesive or the like. The sand 102 may be applied only to a part of the outer peripheral surface of the joint component 1a, or may be applied to the entire outer peripheral surface. It may be appropriately selected according to the situation and design of the construction site.

Here, the sand 102 may be applied to the entire axial length of the joint component 1a, or may be applied only to part of the axial length of the joint component 1a. For example, in the example shown in FIG. 8 , sand 102 is applied to the outer circumference of the joint part 1 a from the end on the bell mouth portion 3 side to the middle of the straight pipe portion to the slope portion 7 .

As shown in FIG. 6, when the joint part 1a is completely buried in the concrete 31, the bell mouth portion 3 having a diameter larger than that of the straight pipe portion, the enlarged diameter part 9, and the like are used to press the joint part 1a against the concrete 31. Axial movement of 1a is restricted. However, for example, if only a part of the joint part 1a (for example, from the bell mouth part 3 to the middle of the straight pipe part) is buried in the concrete 31, the joint part 1a moves in the axial direction (toward the bell mouth part 3). There is a risk that it will be lost. On the other hand, by applying sand 102 to the outer peripheral surface of the portion of the joint part 1a buried in the concrete 31, the adhesion between the concrete 31 and the outer peripheral surface of the joint part 1a is improved. Displacement can be suppressed.

In the above-described example, the connecting part of the wall of the manhole or handhole is embedded in the connecting part of the wall of the manhole or handhole using the center core 25 while the joint parts 1a are aligned. Although the formation method has been described, it is not limited to this method. For example, instead of the core 25, a plurality of pipe and pillow materials may be used to arrange the joint parts 1a at predetermined positions. good.

Next, a method for constructing a subsidence type manhole or handhole using the connection structure of the connecting portion of the wall of the manhole or handhole described above will be described. In the following description, an example of constructing a manhole as an underground structure will be described, but the same applies to handholes. In addition to manholes and handholes, it can be applied to general concrete boxes that are installed for branching and leading in cables when laying cables in the ground in a conduit type, such as branching holes. The shape of the wall of the concrete box is not particularly limited, and may be flat, curved, or the like. Thus, concrete boxes are particularly effective for, but not limited to, manholes or handholes.

First, as shown in FIG. 9(a), a concrete structure 30 in which a plurality of joint parts 1a are embedded at predetermined intervals is installed on the ground 39. As shown in FIG. The structure 30 is a manhole or handhole (excluding a bottom portion described later) having a connection structure formed by the method described above, and has a rectangular cylindrical shape with open top and bottom surfaces. At this time, the opening of the connecting portion (joint component 1a) is covered with a cap 37 for preventing the entry of earth and sand.

Next, as shown in FIG. 9B, the earth and sand of the ground 39 are excavated inside the structure 30 to bury the structure 30 in the ground and sink. After the structure 30 is completely submerged in the ground, concrete is poured into the bottom opening inside the structure 30 to form a bottom 41, as shown in FIG. 9(c). The manhole 40 can be constructed by the above.

Next, a method for connecting a flexible conduit to the connecting portion of the submerged manhole 40 will be described. FIG. 10(a) is a side view showing the flexible electric conduit 50 to be connected, and FIG. 10(b) is a sectional view taken along line EE of FIG. 10(a). 11A is an axial cross-sectional view of the vicinity of the end of the flexible cable tube 50. FIG.

The flexible conduit 50 is provided with a male joint structure 51 at least at one end of the tubular body. The male joint structure 51 is connectable with the female joint structure 11 of the joint component 1a. That is, the female joint structure portion 11 of the joint component 1 a serves as a connection portion with the flexible electric wire tube 50 .

A tubular body (main body portion) of the flexible electric wire tube 50 is a flexible resin tube. A plurality of large-diameter portions 59 and small-diameter portions 61 are alternately formed on the outer peripheral surface of the flexible electric wire tube 50 in the tube axial direction. As shown in FIG. 10B, the large-diameter portion 59 has a substantially square cross-sectional shape, and the small-diameter portion 61 has a circular cross-sectional shape. That is, the flexible electric wire tube 50 is a rectangular electric wire tube in which the main body portion is alternately formed with a large diameter portion 59 having a substantially rectangular cross section and a small diameter portion 61 having a circular cross section.

The diameter of the large-diameter portion 59 (the length of one side of the square) is larger than the outer diameter of the small-diameter portion 61 . By providing the substantially square large-diameter portion 59 in this manner, the flexible electric conduits 50 can be stably arranged when the flexible electric conduits 50 are stacked. The maximum outer diameter of the male joint structure portion 51 is smaller than the diameter (length of one side) of the large diameter portion 59 . Therefore, when viewed from the end on the male joint structure 51 side, the male joint structure 51 does not protrude to the outer circumference of the large diameter portion 59 . Therefore, when the flexible electric conduits 50 are stacked with the large diameter portions 59 in contact with each other, the male joint structure 51 does not interfere with the adjacent flexible electric conduits 50 .

As the flexible electric wire tube 50, as shown in FIG. 11(b), instead of the normal rectangular electric wire tube as shown in FIG. A double-walled rectangular conduit with 69 integral may also be used. In this case, the flexible electric wire tube 50 is composed of an outer tube 67 in which a large diameter portion 59 having a substantially rectangular cross section and a small diameter portion 61 having a circular cross section are alternately formed, and a small diameter portion 61 of the outer tube 67 . and an inner tube 69 which is fused to the inside of the . At this time, as shown in FIG. 11(b), the inner tube 69 may extend so that the tip portion thereof is flush with the position forming the same plane as the end surface of the opening, or may be melted in the vicinity of the opening. It may be cut off at the tip of the attachment part.

Next, the male joint structure 51 of the flexible conduit 50 will be described in detail. 11A, which does not have an inner tube, the structure and function of the male joint structure 51 is such that the flexible electrical conduit 50 is a square electrical conduit made of a single tube. However, the same applies to a double-walled rectangular electrical conduit in which the inner tube 69 is fused to the inside of the outer tube 67 .

The male joint structure portion 51 is formed with a ring member placement portion 63 and a water stop member placement portion 65 on the far side of the electric conduit on the opposite side of the opening from the ring member placement portion 63 . A ring member 53 having an engaging claw 75 and a slide guide 77 is arranged in the ring member arrangement portion 63 . A rubber packing 57 is arranged in the waterproof member arrangement portion 65 .

FIG. 12(a) is a perspective view showing the ring member 53. FIG. The ring member 53 is a substantially C-shaped member having an opening 71 at the distal end in the circumferential direction. One end side of the ring member 53 in the tube axis direction serves as a reduced-diameter portion 73 having an outer diameter smaller than that of other portions. A plurality of locking claws 75 and a plurality of slide guides 77 are provided toward the other end of the ring member 53 . A plurality of locking claws 75 and slide guides 77 are arranged side by side with respect to the diameter-reduced portion 73 so as to be separated from each other via slits in the circumferential direction.

The locking claw 75 has a diameter that gradually increases from the diameter-reduced portion 73 toward the distal end. In this manner, the ring member 53 is provided with a plurality of locking claws 75 that expand outward toward the distal end. As shown in FIG. It is arranged in the ring member arrangement portion 63 so as to expand toward the inner side (the side opposite to the opening).

Also, the slide guide 77 is formed parallel to the tube axis direction. That is, the locking claws 75 and the slide guides 77 are arranged alternately in the circumferential direction. The slide guide 77 is a claw having a slide guide function parallel to the tube axis direction. The slide guide 77 can suppress the falling of the ring member 53 and assist the sliding of the ring member when the ring member 53 is joined to the female joint structure 11 . That is, the ring member 53 has a locking claw 75 extending outward toward the distal end of the ring member 53 with respect to the inner side in the tube axial direction, and a locking claw having a slide guide function parallel to the pipe axial direction. The two claws are arranged alternately in the circumferential direction.

A ring member 53a as shown in FIG. 12(b) may be used. The ring member 53a has substantially the same configuration as the ring member 53, but differs in that a connecting portion 79 is formed at the end on the opening 71 side. That is, the ring member 53a has a connecting portion 79 at the distal end in the circumferential direction. The connecting portions 79 can be connected by meshing with each other. That is, the ring member 53a is a substantially C-shaped member like the ring member 53 when the connecting portion 79 is not connected. On the other hand, by connecting the connection portions 79, the ring member 53a can be formed in an annular shape.

By using the ring member 53a having the connection portion 79 in this manner, the ring member 53a can be arranged in the ring member placement portion 63 without connecting the connection portions 79 to each other. Further, by connecting the connecting portion 79 after the ring member 53 a is arranged in the ring member placement portion 63 , it is possible to prevent the ring member 53 a from coming off the ring member placement portion 63 .

Next, a method of connecting the joint part 1a of the submerged manhole 40 and the flexible conduit (the male joint structure 51) will be described. In the following description, the male joint structure 51 using the ring member 53 will be described, but the same applies to the case of using the ring member 53a.

FIG. 13(a) is a diagram showing a state before the male joint structure 51 of the flexible conduit 50 is inserted into the end of the joint component 1a on the side of the female joint structure 11. FIG. As described above, the joint part 1a of the wall-embedded flexible electric conduit is embedded in the wall surface of the manhole 40 (or handhole; the same shall apply hereinafter). Also, the manhole 40 is installed by the method of constructing a subsidence type manhole or handhole described above.

From this state, as shown in FIG. 13(b), the male joint structure 51 of the flexible cable tube 50 having the male joint structure 51 is inserted into the female joint structure 11 of the joint component 1a. By inserting and connecting the male joint structure portion 51 of the flexible conduit 50 to the connection portion (female joint structure portion 11) of the submerged manhole 40 thus constructed, the connection structure 70 is formed. Obtainable.

When the male joint structure 51 is inserted into the female joint structure 11 in this manner, the ring member 53 is housed in the first housing space 13 of the joint component 1a, and the rubber packing 57 is housed in the second housing space 17. be done.

At this time, since the radial tip of the rubber packing 57 contacts the inner surface of the truncated cone in cross section in the second storage space 17, the waterproof function is stably maintained. As described above, the female joint structure 11 and the flexible conduit 50 can be connected. That is, it is possible to obtain the connection structure 70 between the manhole or handhole and the flexible conduit using the wall-burying flexible conduit joint part.

In the above example, the flexible conduit 50 is a rectangular conduit (or a double-walled rectangular conduit), but the shape of the flexible conduit is not particularly limited. For example, like a flexible electric wire tube 50a shown in FIG. 14(a), a helical convex portion may be formed on the outer peripheral portion of the main body portion. Moreover, like a flexible electric wire tube 50b shown in FIG. 14(b), a convex portion may be formed in a direction perpendicular to the axial direction on the outer peripheral portion of the main body portion. That is, the main body of the flexible conduit may be a flexible conduit having either a helical corrugation or a corrugated independent wave structure.

Next, a connection structure between a manhole or a handhole and a flexible conduit using the wall surface-embedded flexible conduit joint part and other joint members will be described. 15 is a perspective view showing the joint member 80. FIG. In addition, illustration of a ring member, a rubber packing, etc. is omitted in the perspective view. The joint member 80 mainly consists of a joint main body 82 and a π-shaped fixing member 81 .

The Π-shaped fixing member 81 is composed of a top surface portion 85 and a pair of both leg portions 83 . Both leg portions 83 are connected to the vicinity of both ends of the top surface portion 85 so as to be substantially orthogonal to the top surface portion 85 and protrude downward. Both sides of the Π-shaped fixing member 81 are provided with stepped portions 87 . The stepped portion 87 is formed downward so that the upper portion protrudes in both directions. That is, stepped portions 87 are formed on the lower surface (lower side) of the top surface portion 85 so as to protrude outward from the connecting portions of the respective leg portions 83 and the top surface portion 85 .

An engaging portion 89 is formed at a predetermined position below the stepped portion 87 of the Π-shaped fixing member 81 toward the outside of both legs 83 . The engaging portion 89 is formed such that its lower portion protrudes in both directions. The engaging portion 89 and the stepped portion 87 are formed substantially parallel to each other so as to oppose each other.

The inner peripheral surface of the top surface portion 85 of the Π-shaped fixing member 81 is substantially arc-shaped or arch-shaped. The shape of the inner peripheral surface of the top surface portion 85 is a shape corresponding to the outer shape of the small diameter portion 61 of the flexible electrical conduit 50 described above.

A cylindrical portion 91 is formed on one side of the joint body 82 . The cylindrical portion 91 is a portion for fixing a flexible wire tube 50, which will be described later. A male joint structure 51 is formed on the other side of the joint body 82 . The male joint structure 51 has a structure similar to that shown in FIG. That is, the male joint structure 51 can be connected to the female joint structure 11 of the joint component 1a described above.

Next, a method for connecting the cut flexible cable tube 50 and the joint member 80 will be described. FIG. 16( a ) is a diagram showing a state in which the flexible cable tube 50 is cut to a predetermined length and the cut portion 97 is arranged to face the cylindrical portion 91 of the joint member 80 . The flexible electric conduit 50 is cut at approximately the center of the small diameter portion 61 .

The tubular portion 91 is a portion into which the cut flexible electric conduit 50 is inserted. A part of the tubular portion 91 is formed with a notch portion 95 in which the top surface 93 and the upper side surface of the substantially rectangular portion are opened. Openings 96 are provided on both sides of the substantially rectangular bottom portion of the cylindrical portion 91 . The opening 96 is formed at a position corresponding to the notch 95 with respect to the pipe axis direction of the joint body 82 .

An engagement step portion 98 is formed inside the side surface of the tubular portion 91 at a position corresponding to the notch portion 95 . The engaging stepped portion 98 is formed by a projection projecting inward substantially parallel to the pipe axis direction of the joint main body 82 . Further, a water stop member 99 is arranged on the far side (on the side of the male joint structure portion 51 ) from the notch portion 95 so as to surround the entire inner peripheral surface of the tubular portion 91 .

Next, as shown in FIG. 16(b), the flexible cable tube 50 is inserted into the cylindrical portion 91 of the joint member 80, and further. The Π-shaped fixing member 81 is inserted into the notch 95 from above the tubular portion 91 . At this time, the opening diameter of the tubular portion 91 is formed to be large enough to accommodate the large-diameter portion 59 of the flexible conduit 50 . Furthermore, the length of the cylindrical portion 91 is set to a length that allows insertion of the pair of large-diameter portions 59 sandwiching the small-diameter portion 61 of the flexible conduit tube 50 .

When the Π-shaped fixing member 81 is inserted into the notch 95 from above, the stepped portion 87 of the Π-shaped fixing member 81 is placed on the upper side surface of the cylindrical portion 91 . Also, the tips of both legs 83 of the Π-shaped fixing member 81 are inserted into openings 96 provided on both sides of the bottom of the tubular portion 91 . Further, when the Π-shaped fixing member 81 is pushed until the stepped portion 87 contacts the edge of the notch 95 , the engaging portion 89 of the Π-shaped fixing member 81 engages with the engaging stepped portion 98 . Therefore, the Π-shaped fixing member 81 is fixed to the cylindrical portion 91 and the Π-shaped fixing member 81 does not come off from the cylindrical portion 91 .

Also, when the Π-shaped fixing member 81 is placed on the upper part of the side surface of the notch 95 , the inner peripheral surface of the top surface portion 85 of the Π-shaped fixing member 81 is smaller, equal to or slightly larger than the small diameter portion 61 of the flexible conduit 50 . Therefore, the Π-shaped fixing member 81 does not interfere with the small-diameter portion 61 of the flexible conduit 50 .

In addition, in the state where the Π-shaped fixing member 81 is fixed to the cylindrical portion 91 in this way, if the flexible electric conduit 50 is to be pulled out from the joint member 80 , the upper portion of the inner surface of the top surface portion 85 of the Π-shaped fixing member 81 A portion and both legs 83 abut and engage the side surfaces of the substantially square large diameter portion 59 of the flexible conduit 50 . Since the flexible electric wire tube 50 and the joint member 80 are thus engaged in the tube axial direction, the flexible electric wire tube 50 does not come off from the joint member 80 .

Further, as described above, the waterproof member 99 is arranged on the inner surface of the cylindrical portion 91 on the inner side of the notch portion 95 so as to surround the entire inner peripheral surface of the cylindrical portion 91 . Therefore, the inner surface of the cylindrical portion 91 and the outer surface of the large-diameter portion 59 of the flexible cable tube 50 are brought into close contact with each other through the water-stopping member 99 to ensure water-stopping.

FIG. 17 is a diagram showing a connection structure 70a between the manhole 40 and the flexible conduit 50. As shown in FIG. The connection structure 70a is formed by connecting the joint component 1a embedded in the manhole 40, the joint member 80, and the flexible conduit 50. As shown in FIG. Thus, the joint member 80 has a structure similar to that of the male joint structure 51 of the flexible conduit 50 at one end, and a cut surface of the flexible conduit 50 at the other end. It has structures that are connected. Therefore, the female joint structure portion 11 of the joint component 1a and the male joint structure portion 51 of the joint member 80 can be connected to each other, and the tubular portion 91 (possibly The cut surface (the cut portion 97) of the flexible electric wire tube 50 can be connected to the structure connected to the cut surface of the flexible electric wire tube 50).

FIG. 18 is a diagram showing a conduit network 100 of flexible electric conduits 50 using a connection structure between manholes 40 and flexible electric conduits 50. As shown in FIG. The conduit network 100 is a combination of connection structures of a plurality of manholes 40 (or handholes) and flexible conduits 50 . For example, in the illustrated example, one manhole 40 (left side in the figure) has a connecting structure 70 . That is, in the connection structure 70, the flexible cable tube 50 having the male joint structure 51 and the female joint structure 11 of the joint component 1a are connected.

The other manhole 40 (on the right side in the figure) has a connection structure 70a. That is, in the connection structure 70a, the cut flexible conduit 50 and the female joint structure 11 of the joint component 1a are connected via the joint member 80 having the male joint structure 51. As shown in FIG. A cut surface of the other cut portion of the flexible electric conduit 50 connected to the joint member 80 and a cut surface of the cut portion of the other flexible electric conduit 50 are connected by a pipe joint 101 . The pipe joint 101 is, for example, a joint in which the tubular portions 91 of the joint member 80 are formed on both sides. That is, according to the pipe joint 101, the cut surfaces of the cut portions of the cut flexible conduit 50 can be connected.

In addition to the above, the conduit network 100 of the flexible conduit 50 includes a male connection portion having the same structure as the male joint structure 51 at one end of the conduit and a It is also possible to add to the pipeline network 100 a structure for interconnecting the male and female connections of a plurality of conduits having a female connection as a female connection structure that can be mated with the conduit. is.

As described above, according to this embodiment, since the joint part 1a is made of a hard resin material, when the joint part 1a is embedded in the wall surface of a manhole or a handhole, when the concrete 31 is poured to harden the circumference of the joint part 1a. In addition, deformation of the joint part 1a due to the weight of the concrete 31 and the heat of reaction when the concrete 31 solidifies can be prevented. In particular, since the cross-sectional shape of the outer peripheral portion of the joint part 1a is a cylindrical member with a two-stage cylinder, there is no vertical wall portion on the outer peripheral portion of the member, so air pockets are less likely to occur when placing the concrete 31. .

Here, since hard resins such as hard vinyl chloride generally have poor moldability, blow molding and injection molding are difficult. For this reason, extruded tubes are often used because it is difficult to mold them into complicated three-dimensional shapes.

As described above, when it is assumed that a hard extruded pipe such as hard vinyl chloride is used, it is difficult to perform injection molding or blow molding. It is not possible to realize a female joint structure that can be fitted with a male joint structure that includes a retaining structure such as a ring. That is, it has been considered difficult to form a member having a locking structure that locks and fixes a locking pawl from a hard resin that cannot form a vertical wall perpendicular to the pipe axis direction by molding. For this reason, polyethylene and the like, which are easy to mold, have been adopted as such joint parts.

On the other hand, in the present embodiment, unlike the polyethylene joint parts used for the conventional pipe material, the joint parts 1a are made of a hard resin material such as hard vinyl chloride from the viewpoint of load resistance. be. In addition, by forming the female joint structure 11 by cutting using a hard resin such as hard vinyl chloride, it has a female joint structure 11 made of a hard resin material that enables straight insertion type one-touch connection. A joint component 1a used for manholes or the like can be obtained.

Further, since the joint component 1a is made of a hard resin material, it can be machined with high accuracy by cutting. Therefore, the dimensional accuracy of the female joint structure 11 is good, and the insertability of the male joint structure 51 is good. In addition, the bell mouth portion 3 and the enlarged diameter portion 9 can prevent the joint component 1 a from falling out of the concrete 31 . The second enlarged diameter portion 9a can disperse the load applied to the inclined portion when a load is applied from the female joint side to the bellmouth side.

In addition, the joint component 1a as a whole forms a two-stage cylindrical cross section with the slope portion 7 interposed therebetween, thereby preventing the male joint structure portion 51 from slipping out toward the bell mouth portion 3 side. can. Further, for example, the load applied to the female joint structure 11 can be dispersed when an earthquake occurs. The structure of the slope portion 7 may be substantially straight, curved in a convex shape, or curved in a concave shape, as long as it is formed in the shape of a slope having a predetermined inclination with respect to the direction of the tube axis. When the tip of the mold joint structure 51 abuts against the inner surface of the slope portion 7, the slope portion 7 has the effect of evenly dispersing the stress.

Further, since the end faces of the joint part 1a can be formed into the flat surfaces 21a, 21b by cutting, the joint part 1a can adhere to the molds 23a, 23b and prevent the concrete 31 from entering inside. Furthermore, by cutting, the entire length can be manufactured with high accuracy. Furthermore, by arranging the elastic bodies 33 on the flat surfaces 21a and 21b, it is possible to more reliably prevent the concrete 31 from entering the interior.

Further, by arranging the water stop member 35 on the outer peripheral portion of the joint component 1a, it is possible to secure water stop between the concrete 31 and the outer surface of the joint component 1a.

In addition, since the locking claws 75 of the ring member 53 of the male joint structure 51 are housed in the first storage space 13 as a retaining structure, the locking claws 75 of the ring member 53 are stably supported. be able to. In addition, the contact of the radial tip of the rubber packing 57 in the second housing space 17 can stably maintain the waterproof function.

In this manner, the tip of the ring member 53 of the male joint structure 51 abuts against the inner surface of the partition 15 having a cylindrical cross section, so that the partition 15 functions to prevent the male joint structure 51 from coming off. Therefore, the male joint structure 51 does not come off even when a pull-out force is applied from the outside. When the male joint structure portion 51 is inserted into the female joint structure portion 11, the tip of the male joint structure portion 51 is brought into contact with the inner wall of the slope portion 7, so that the slope portion 7 becomes the male joint structure portion. It exhibits the function of positioning the structural portion 51 in the axial direction.

An example in which the ring member 53 is arranged in the male joint structure 51 and the locking claw 75 of the ring member 53 of the male joint structure 51 is accommodated in the first accommodation space 13 of the female joint structure 11. has been described, but is not limited to this. 19(a) and 19(b) are diagrams showing a process of connecting the joint component 1c having the female joint structure 11a and the male joint structure 51a.

(When a storage space is formed in the female joint structure and the ring member is arranged in the first storage space)
The female joint structure 11a has substantially the same structure as the female joint structure 11, but the ring portion of the ring member 53b is arranged on the circumferential surface of the first storage space 13 of the female joint structure 11a. be done. The ring member 53b is a substantially C-shaped member with an open distal end in the circumferential direction. It extends obliquely inward so as to reduce its diameter. The ring portion of the ring member 53b is fixed to the first storage space 13 by, for example, elastic contact or adhesion so as to contact the circumferential surface of the first storage space 13. As shown in FIG. Moreover, although not shown, the ring member is not limited to the substantially C-shape, and may be an annular ring member. When an annular ring member is used as the ring member, since the shape of the ring portion is constant, it is fixed by adhesion.

Also, the male joint structure portion 51a is substantially similar to the male joint structure portion 51, but the ring member and the ring member placement portion are not formed. A locking pawl locking portion 58 is formed at the end of the male joint structure portion 51a. The far side of the locking claw locking portion 58 in the pipe axis direction has a stepped shape with a smaller diameter than the locking claw locking portion 58 . In addition, it has a tapered shape in which the outer diameter gradually decreases from the locking claw locking portion 58 toward the tip. The rubber packing 57 is arranged on the back side (opposite side to the open end) in the pipe axis direction of the locking claw locking portion 58 .

As shown in FIG. 19(b), when the male joint structure 51a is connected to the female joint structure 11a, the locking claw 75a of the ring member 53b arranged on the female joint structure 11a is , is fixed to the locking pawl locking portion 58 of the male joint structure portion 51a. At this time, the rubber packing 57 arranged in the waterproof member arrangement portion 65 formed behind the male joint structure portion 51a is accommodated in the second accommodation space 17 of the female joint structure portion 11a. Here, the second storage space 17 may be formed in the enlarged diameter portion 9 or may be formed in the second enlarged diameter portion 9a as shown in the drawing. As described above, the ring member 53b may be arranged on the female joint structure 11a.

(When a storage space is formed in the female joint structure and the split body of the ring member is arranged in the first storage space)
20(a) and 20(b) are diagrams showing a process of connecting the joint component 1d having the female joint structure portion 11b and the male joint structure portion 51a. As shown, instead of arranging the C-shaped or annular ring member 53b in the first housing space 13 formed in the female joint structure, a segment 54 of the ring member 53b may be arranged. It is desirable that the divided bodies 54 are spaced apart from each other by a predetermined distance in the circumferential direction and arranged on the inner peripheral surface of the first housing space 13 at approximately equal intervals. That is, on the circumferential surface of the first storage space 13 of the female joint structure 11b, a plurality of short arc-shaped ring member segments 54 are formed by cutting the ring member 53b into predetermined lengths at predetermined positions in the circumferential direction. are affixed to the circumferential surface in a predetermined number at predetermined intervals in the circumferential direction.

In addition, the shape of the divided body 54 is such that the outer peripheral side has substantially the same shape as the cylindrical portion of the cylindrical groove of the first storage space 13, and is formed into a shape that can be stored in the first storage space 13. It is good if it is. The locking claw 75a of the divided body 54 extends backward in the tube axial direction so as to decrease in diameter obliquely inward from the enlarged diameter portion (the end opposite to the locking claw 75a) toward the tip of the locking claw 75a. It is desirable that they are formed so as to extend toward them, and the enlarged diameter portion of the divided body 54 and the locking claws 75a may be integrally formed. In other words, the divided body 54 has a shape obtained by cutting the annular ring member 53b into a predetermined length in the circumferential direction.

In this way, the split member 54 of the ring member is used in place of the ring member 53b, and the male joint structure portion 51a is also attached to the female joint structure portion 11b in which the split portion 54 is adhesively fixed in the first housing space 13. can be connected. As shown in FIG. 20(b), when the male joint structure 51a is connected to the female joint structure 11b, the plurality of divided bodies 54 of the ring member arranged in the female joint structure 11b are The locking pawl 75a is fixed to the locking pawl locking portion 58 of the male joint structure 51a. Also, the rubber packing 57 arranged in the waterproof member arrangement portion 65 formed behind the male joint structure portion 51a is accommodated in the second accommodation space 17 of the female joint structure portion 11b. Here, the second storage space 17 may be formed in the enlarged diameter portion 9 or may be formed in the second enlarged diameter portion 9a as shown in the drawing. As described above, also in this embodiment, it is possible to obtain the same effects as those of the female joint structure 11a in which the C-shaped or annular ring member 53b is arranged.

(When the ring member is directly arranged without forming a storage space as the female joint structure by cutting the enlarged diameter part)
21(a) and 21(b) are diagrams showing a process of connecting the joint component 1e having the female joint structure 11c and the male joint structure 51a. The female joint structure 11c is different from that shown in FIG. 19 in that the first and second storage spaces are not created by cutting. For example, as shown in FIG. 3(b), the raw tube 19 is heated at a predetermined temperature, and the bell mouth portion 3, the slope portion 7 and the enlarged diameter portion 9 (second enlarged diameter portion 9a) are expanded by thermoforming. Then, the raw pipe of the joint member is formed, and the female joint structure portion 11c is formed without cutting the inner peripheral surface of the raw pipe.

A C-shaped or annular ring member similar to the ring member 53b described above is directly adhered to the inner peripheral surface of the enlarged diameter portion 9 of the female joint structure portion 11c formed in this manner. As described above, the male joint structure 51a is also applied to the female joint structure 11c in which the ring member 53b is directly bonded and fixed to the inner surface of the enlarged diameter portion 9 without providing the first storage space 13 (groove). can be connected.

At this time, the locking claw 75a of the ring member 53b arranged on the female joint structure 11c is fixed to the locking claw locking portion 58 of the male joint structure 51a. In addition, the rubber packing 57 arranged in the waterproof member arrangement portion 65 formed behind the male joint structure portion 51a is attached to the second enlarged diameter portion 9a (or expanded portion) of the second storage space 17 of the female joint structure portion 11b. It contacts the inner surface of the diameter 9). As described above, also in this embodiment, it is possible to obtain the same effects as those of the female joint structure 11a in which the C-shaped or annular ring member 53b is arranged.

That is, the male joint structure portion 51a is placed at a predetermined position inside the inner peripheral surface of the space having a substantially cylindrical cross section of the enlarged diameter portion 9 of the cylindrical member having a two-stage cylindrical cross section of the female joint structure portion 11c. The male joint structure 51a can be locked inside the female joint structure 11c by directly bonding and fixing the locking member (ring member 53b) having locking claws for locking the male joint structure 11c. Further, a waterproof member is arranged at a predetermined position of the male joint structure 51a, which is spaced a predetermined distance from the position where the locking member is adhesively fixed toward the opening, so that the female joint structure 11c and the male joint structure 51a are separated. Water can be stopped.

In this case, a groove having a substantially cylindrical cross section may be formed on the inner surface of the female joint structure 11c by cutting. In this case, the ring portion of the locking member is fixed to the cylindrical surface of the female joint structure portion 11c. The locking pawl of the locking member extends from the ring portion toward the tip of the pawl portion so as to decrease in diameter obliquely inward with respect to the inner side in the pipe axial direction. When the male joint structure portion 51a is connected to the female joint structure portion 11c, the locking pawl is fixed to the locking pawl locking portion 58 of the male joint structure portion 51a. Also, the rubber packing 57 arranged in the waterproof member arrangement portion 65 formed behind the male joint structure portion 51a is accommodated in the substantially cylindrical groove in cross section of the female joint structure portion 11b.

In this manner, the enlarged diameter portion 9 and the second enlarged diameter portion 9a may be formed continuously, and are separated by the partition portion 15, and the first storage space 13 and the second storage space are provided with the partition portion 15 interposed therebetween. A space 17 may be formed.

Here, the body portion of the flexible conduit in the connection structure between the joint part and the flexible conduit shown in FIGS. It may be a flexible conduit tube of any shape, or the main body may be a rectangular conduit tube in which a large diameter portion having a substantially rectangular cross section and a small diameter portion having a circular cross section are alternately formed, and A double-walled rectangular electric wire tube in which a straight inner tube 69 is integrated inside an outer tube may be used. In this case, the main body of the flexible electric conduit is fused to the inner side of the outer tube in which the large-diameter portion having a substantially rectangular cross-section and the small-diameter portion having a circular cross-section are alternately formed, and the small-diameter portion of the outer tube. and an inner tube.

As described above, the female joint structure using a cylindrical member having a two-stage cylindrical cross section and having a body portion, a slope portion, and an enlarged diameter portion made of a hard resin material as the joint component described in the present embodiment is provided according to the present invention. The features and effects of the structure are summarized below.
(1) The joint part installed inside the wall surface is a cylindrical member formed with a circular cross-section having a different diameter in appearance, and has a female joint structure that can be connected to the male joint structure. This is a straight insertion type one-touch connection joint for structural parts.
(2) Since the joint parts are made of hard resin material such as hard vinyl chloride, deformation of the joint parts due to the weight of the concrete and reaction heat during concrete placement is prevented, and the dimensional accuracy of the female joint structure is maintained. Insertability and joint strength when inserting the type joint structure can be ensured.
(3) The sloped portion has both the effect of preventing the male joint structure from coming off toward the bellmouth side and the effect of positioning the locking member, thereby making it possible to obtain a stable connection structure. It has the effect of preventing the bell mouth from slipping out of the placed concrete structure.
(4) The outer dimensions of the joint parts do not exceed the large-diameter portion of the flexible conduit to be connected at maximum, or are set substantially the same, so that the flexible conduit can be compactly arranged and arranged. be able to.
(5) Since the outer shape of the joint part is a continuous cylindrical member with a substantially circular cross-sectional shape with few unevenness, the concrete can be placed easily without formation of air pockets.
(6) Since the joint part is installed inside the wall surface and there is no part protruding from the wall surface, it can be installed in both submerged manholes and ordinary manholes. In addition, when attaching sand to a predetermined position on the outer peripheral surface of the joint component, it is possible to adopt a structure in which the sand is used by protruding from the wall surface.

Furthermore, by performing groove processing by cutting on the enlarged diameter portion, a joint part is obtained in which a retaining member for retaining water and a packing for stopping water can be accommodated in a predetermined space partitioned by the partition portion. can, more specifically, have the following effects:
(7) The female type joint structure of the joint component has a first storage space for storing the retainer component, a second storage space for storing the waterproof packing, and a partition section for partitioning them. Therefore, there is no need for a vertical wall perpendicular to the axial direction of the joint member for partitioning the two spaces, which conventional joint parts have.
(8) The locking member housed in the first housing space may be internally mounted in the female joint structure. In this case, the elastic ring, which is the locking member, may be reduced in diameter and accommodated in the first storage space, and the ring member, which is the locking member, may be elastically brought into contact with or adhered to be fixed in the first storage space. good. Alternatively, as a component to be crowned on the male joint structure, an elastic ring may be expanded in diameter and housed in the first housing space to house the locking claw of the locking member.
(9) The protruding amount of the partition may be 2 to 3 mm, which has both the effect of locking the retainer part and the effect of increasing the rigidity of the tube by the rib effect in the inner circumferential direction.
(10) Instead of forming the first storage space and the second storage space by cutting, the same effect as forming the storage space by cutting can be obtained by forming a partition to which the sheet-like member is attached. can be done.
(11) As described above, it is possible to reduce the size of joint parts, shorten the construction time, and reduce the size of manholes and hand holes that connect the joint parts.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the technical scope of the present invention is not influenced by the above-described embodiments. It is obvious that a person skilled in the art can conceive various modifications or modifications within the scope of the technical idea described in the claims, and these are naturally within the technical scope of the present invention. be understood to belong to

1, 1a, 1b, 1c, 1d, 1e, 1f Joint parts 5 Body portion 6 Chamfered portion 7 Inclined portion 9 Expanded diameter portions 9a, 9b Second expanded diameter portions 11, 11a, 11b, 11c Female joint structure portion 10 Male joint structure 13 First storage space 15 Partition portion 17 Second storage space 19 ……Material pipes 21a, 21b……Flat surfaces 23a, 23b……Formwork 25……Center core 27……Bolts 29……Reinforcing bars 30……Structural body 31……Concrete 33…… …… Elastic body 35 …… Waterproof member 37 …… Cap 39 …… Ground 40 …… Manhole 41 …… Bottom parts 50, 50a, 50b …… Flexible conduit 51, 51a …… Male Die joint structure portions 53, 53a, 53b Ring member 54 Divided body 57 Rubber packing 58 Locking pawl locking portion 59 Large diameter portion 61 Small diameter portion 63 …… Ring member arrangement portion 65 ……Water stop member arrangement portion 67 ……Outer tube 69 ……Inner tubes 70, 70a ……Connection structure 71 ……Opening 73 ……Reduced diameter portion 75 , 75a Locking claw 77 Slide guide 79 Connecting portion 80 Joint member 81 Pi-shaped fixing member 82 Joint main body 83 Both legs 85 Top surface 87 Stepped portion 89 Engagement portion 91 Cylindrical portion 93 Top surface 95 Notch portion 96 Opening portion 97 Cutting portion 98 ... Engagement stepped portion 99 ... Water stop member 100 ... Pipe network 101 ... Pipe joint 102 ... Sand

Claims (28)

A joint part having a female joint structure that can be embedded in the wall surface of a manhole or handhole and can be used without protruding from the wall surface,
The joint component is a tubular member made of a hard resin material,
The joint part includes, from one end to the other end, a bell mouth portion, a main body portion having a substantially cylindrical outer shape for inserting an electric wire or a cable, and a diameter-enlarged portion transitioning from the main body portion. An inclined surface portion and an enlarged diameter portion adjacent to the inclined surface portion and having a substantially cylindrical outer shape and having an inner diameter larger than that of the main body portion are formed in this order,
The open end of the bell mouth portion is larger in diameter than the body portion,
The outer shape from the bell mouth portion to the enlarged diameter portion has a cylindrical cross section formed with two stages of different outer diameters,
The slope portion has a slope structure in which the inner and outer diameters of the pipe gradually increase from the body portion toward the enlarged diameter portion in the pipe axial direction,
The female joint structure is formed on the inner surface of the cylindrical space of the enlarged diameter portion,
In the female joint structure, a locking member for locking the male joint structure and a packing for stopping water between the female joint structure and the male joint structure have a substantially cylindrical cross section. A wall surface-embedded flexible conduit joint part, characterized in that it can be housed at a predetermined distance from each other toward the opening from the back side of the inner peripheral surface of the space. The female joint structure portion includes a groove having a substantially cylindrical cross section formed by cutting at a predetermined position in the space having a substantially cylindrical cross section, and a partition portion formed between the grooves without cutting. By
The space created by the groove having a substantially cylindrical cross section is divided into two spaces, a first storage space and a second storage space, by the partition part,
The first storage space, the partition, and the second storage space are formed in order from the inside of the joint component toward the opening of the other end,
The first storage space and the second storage space are two storage spaces having a substantially cylindrical cross section with a predetermined width and a predetermined depth, which are partitioned by the partition projecting inwardly of the tube,
A locking member for locking the male joint structure can be stored in the first storage space of the female joint structure, and the second storage space can accommodate the 2. The wall surface-embedded flexible conduit fitting part according to claim 1, wherein the packings for water-stopping the male joint structures can be accommodated at a predetermined distance from each other. A second enlarged diameter portion, which is wider than the enlarged diameter portion, is formed on the opening side of the enlarged diameter portion, and the outer peripheral surface of the second enlarged diameter portion is formed in a substantially cylindrical shape having the same diameter. Alternatively, a cylindrical cylindrical portion is formed in a cylindrical shape that gently expands outward at a predetermined angle, and the outer peripheral surface of the expanded diameter portion has at least a wall perpendicular to the pipe axis direction. 3. The wall surface-embedded flexible conduit joint part according to claim 2, wherein a cross section with an acute angle is not formed. The inner circumference of the second enlarged diameter portion is expanded gently at a predetermined angle toward the tip substantially parallel to the outer circumference of the second enlarged diameter portion, or has the same size as the inner circumference of the enlarged diameter portion. The enlarged diameter portion and the second enlarged diameter portion are formed continuously or are separated by a partition portion, and the enlarged diameter portion and the second enlarged diameter portion are separated from each other. 4. The wall-embedded device according to claim 3, wherein when the enlarged-diameter portion is partitioned by a partition, a first storage space and a second storage space are formed across the partition. Flexible conduit fitting parts. The partition portion is either formed as a non-cut portion as a result of grooving by cutting, or is formed by attaching a sheet-like member, and the diameter is reduced by the partition portion. 5. The wall-burying flexible conduit joint component according to claim 2, wherein the height of the portion is 2 mm or more and 5 mm or less. 6. The wall surface according to any one of claims 2 to 5, wherein the hard resin material is at least one of hard vinyl chloride, ABS resin, PET resin, PC resin, and glass fiber reinforced thermoplastic resin. Buried flexible conduit fitting parts. At least one of the end face of the opening at the tip of the female joint structure for connecting with the flexible wire tube of the joint component and the end face of the opening at the tip of the bell mouth portion is formed flat. 7. The wall surface-embedded flexible conduit joint part according to claim 2, wherein An elastic body is attached to at least one end face of the opening at the tip of the female joint structure for connecting with the flexible conduit of the joint part or the end face of the opening at the tip of the bell mouth part. 8. The wall surface-embedded flexible conduit joint part according to any one of claims 2 to 7, wherein 9. The wall-burying according to any one of claims 2 to 8, wherein a water stop member is annularly attached to the outer peripheral surface of the joint part at a predetermined position on at least a part of the outer peripheral surface of the joint part. Flexible Conduit Fitting Parts for. 10. The method according to any one of claims 2 to 9, wherein sand is annularly adhered to a predetermined position on at least a part of the outer peripheral surface of the joint part so as to surround the outer peripheral surface of the joint part in the circumferential direction. The flexible conduit fitting part for wall-burying according to . The nominal diameter of the flexible conduit to be connected is printed on at least one of the inner surface of the female joint structure for connecting with the flexible conduit of the joint part and the inner surface of the bell mouth portion. 11. The wall surface-embedded flexible conduit joint component according to any one of claims 2 to 10, wherein A connection structure between a manhole or a handhole and a flexible conduit using the wall-embedded flexible conduit joint part according to any one of claims 2 to 11. There is
The wall-embedded flexible conduit joint part is embedded in the wall surface of a manhole or a handhole, and the male joint structure of the flexible conduit having the male joint structure is the female joint of the joint part. A connection structure between a manhole or a handhole and a flexible conduit, wherein the female joint structure and the flexible conduit are connected by being inserted into the structure. The male joint structure includes a ring member placement portion for placing a ring member as a locking member, a water stop member placement portion formed closer to the opening than the ring member placement portion, and the ring member placement portion. and a rubber packing arranged in the waterproof member arrangement portion,
The ring member is a substantially C-shaped or annular member with an open end in the circumferential direction, and a locking claw that expands outward toward the end of the ring member toward the inner side in the tube axial direction. and a claw different from the locking claw having a slide guide function parallel to the pipe axis direction, and the two claws are alternately arranged in the circumferential direction,
The ring member is housed in the first housing space of the joint component,
13. The connection structure between a manhole or handhole and a flexible conduit according to claim 12, wherein said rubber packing is housed in said second housing space. A ring portion of a ring member serving as a locking member is disposed on the circumferential surface of the first housing space of the female joint structure, and the ring member is substantially C-shaped with an open distal end in the circumferential direction. The locking claw of the ring member extends from the ring portion toward the tip so that the diameter of the claw portion decreases obliquely inward with respect to the inner side in the tube axis direction. and when the male joint structure is connected to the female joint structure, the locking pawl is fixed to the locking pawl locking portion of the male joint structure, and the male joint 13. The manhole according to claim 12, characterized in that a rubber packing arranged in a waterproof member arrangement portion formed behind the structure portion is accommodated in the second accommodation space of the female joint structure portion. A connection structure between a handhole and a flexible conduit. The engaging claw of the substantially C-shaped or annular ring member serving as the engaging member is arranged such that the diameter of the engaging claw decreases obliquely inward from the inner side in the tube axial direction from the ring portion toward the tip. The ring portion of the ring member is fixed by elastic contact or adhesion so as to come into contact with the circumferential surface of the first storage space. 15. The connection structure between the manhole or handhole and the flexible conduit according to 14. In the circumferential surface of the first housing space of the female joint structure, a plurality of short arcuate pieces are formed by cutting the ring member as the locking member into predetermined lengths at predetermined positions in the circumferential direction. A predetermined number of split bodies of the ring member are attached to the circumferential surface at predetermined intervals in the circumferential direction, and when the male joint structure is connected to the female joint structure, a plurality The locking claw of the divided body is fixed to the locking claw locking portion of the male joint structure, and the rubber packing is arranged in the waterproof member arrangement portion formed behind the male joint structure. 15. The connection structure between a manhole or handhole and a flexible conduit according to claim 14, wherein is housed in said second housing space of said female joint structure. A connection structure between a manhole or a handhole and a flexible conduit using the wall-embedded flexible conduit joint part according to claim 1,
The wall-embedded flexible conduit joint part is embedded in the wall surface of a manhole or a handhole, and the male joint structure of the flexible conduit having the male joint structure is the female joint of the joint part. The female joint structure and the flexible conduit are connected by being inserted into the structure,
In the female joint structure, the male joint structure is placed at a predetermined position inside the inner peripheral surface of the space of the enlarged diameter portion of the tubular member having a two-step cylindrical cross section and having a substantially cylindrical cross section. A locking member having locking claws for locking is directly adhered and fixed, so that the male joint structure is locked inside the female joint structure, and furthermore, from the position where the locking member is adhered and fixed. A wall surface characterized in that a water stop member is arranged at a predetermined position of the male joint structure spaced apart by a predetermined distance toward the opening to stop water between the female joint structure and the male joint structure. A connection structure between a manhole or handhole and a flexible conduit using an embedded flexible conduit joint part. The ring portion of the locking member is fixed to the cylindrical surface of the female joint structure, and the locking claw of the locking member is obliquely inward from the ring portion toward the tip of the claw portion with respect to the inner side in the pipe axis direction. When the male joint structure is connected to the female joint structure, the locking claw engages the male joint structure. A rubber packing fixed to the pawl engaging portion and arranged in a waterproof member arrangement portion formed behind the male joint structure is formed by cutting on the inner surface of the female joint structure. 18. A connection structure between a manhole or a handhole and a flexible conduit by means of the flexible conduit joint component for wall surface embedding according to claim 17, wherein the flexible conduit is housed in a cylindrical groove. A connection structure between a manhole or a handhole and a flexible conduit using the wall-burying flexible conduit joint component according to any one of claims 2 to 11 and a joint member,
The joint member has the male joint structure of the flexible conduit at one end, and has a structure connected to the cut surface of the flexible conduit at the other end,
the female joint structure portion of the wall-embedded flexible conduit joint part and the male joint structure portion of the joint member are connected to each other;
The flexible conduit connected to the other end of the joint member is a flexible conduit in which a large diameter portion having a substantially rectangular cross section and a small diameter portion having a circular cross section are alternately formed in a body portion,
A manhole characterized in that a cut portion of a small diameter portion of a flexible conduit is connected to a structure connected to a cut portion of a small diameter portion of the flexible conduit at the other end of the joint member, or A connection structure between a handhole and a flexible conduit. The cut portion of the other small-diameter portion of the flexible electric conduit connected to the joint member and the cut portion of the small-diameter portion of the other flexible electric conduit are cut so that the tubular portion of the joint member is formed on both sides. 20. The structure for connecting a manhole or handhole and a flexible conduit according to claim 19, wherein the manholes or handholes are connected to each other by pipe joints. The main body of the flexible conduit has a helical corrugation, an independent wave structure corrugation, or a rectangular conduit in which a large diameter section with a substantially rectangular cross section and a small diameter section with a circular cross section are alternately formed, or 19. The manhole or handhole and the flexible wire according to any one of claims 12 to 18, characterized in that it is a double-walled conduit in which an inner tube is fused to a small-diameter part of a rectangular conduit. Connection structure with pipes. 21. The main body of the flexible conduit is a square conduit in which a large diameter section with a substantially rectangular cross section and a small diameter section with a circular cross section are alternately formed. The connection structure between the manhole or handhole and the flexible conduit according to 1. The main body of the flexible conduit is a double-walled rectangular conduit, in which a large diameter section with a substantially rectangular cross section and a small diameter section with a circular cross section are alternately formed, and an inner tube is fused to the inner side of the small diameter section. 21. The connection structure between a manhole or a handhole and a flexible conduit according to any one of claims 12 to 20, characterized in that: A network of flexible conduits using the connection structure for manholes or handholes and flexible conduits according to any one of claims 19 to 23,
A conduit network of flexible conduits characterized by a combination of connecting structures of a plurality of manholes or handholes and flexible conduits. A connection structure of a connection part in a wall of a manhole or a handhole using the wall-burying flexible conduit joint component according to any one of claims 2 to 11,
A manhole or a handhole characterized in that the wall surface-embedded flexible conduit joint parts are embedded in a connection part of the wall of the manhole or handhole in an aligned state using a tube pillow material that can be arranged in plurality. Connection structure of handhole wall connection. 26. A method of constructing a subsidence type manhole or handhole using the connection structure of the connection part of the wall of the manhole or handhole according to claim 25, wherein the manhole or handhole having the connection structure formed with the After covering the opening of the connecting part with a cap to prevent the intrusion of earth and sand, the manhole or handhole is excavated and buried in the ground. A subsidence type manhole or handhole construction method characterized by: Connecting by inserting the male joint structure of the flexible electrical conduit into the connecting portion of the constructed submerged manhole or handhole by the submerged manhole or handhole construction method according to claim 26. A method for connecting a flexible conduit to a submerged manhole or handhole, characterized by: A method for manufacturing the wall surface-embedded flexible conduit joint component according to claim 1,
A rigid vinyl chloride extruded pipe is used as a raw pipe, and the raw pipe is heated at a predetermined temperature and thermoformed to expand the diameter of the bellmouth portion, the slope portion, and the enlarged diameter portion. The female joint structure for connecting with a flexible conduit by forming the first storage space and the second storage space at predetermined positions sandwiching the partition having a cylindrical cross section by cutting. A method for manufacturing a wall-embedded flexible conduit joint part having excellent dimensional accuracy and load resistance of a female type joint structure, characterized by forming a part.

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