JP7407662B2 - Protective member for cable extraction, conduit line of rectangular electric conduit, structure for extracting electric wires or cables from the conduit line of rectangular electric conduit, and laminated structure of conduit line of rectangular electric conduit - Google Patents

Description

The present invention relates to a protective member for taking out a cable used at a branch part of a cable, a conduit line of a rectangular electric conduit using the same, a structure for extracting electric wires or cables from a conduit line of a rectangular electric conduit, and a conduit line of a rectangular electric conduit. Regarding the laminated structure of.

In the past, round spirally corrugated conduits were often used, but in recent years, rectangular conduits with alternating square and circular cross sections have been proposed as underground cable protection conduits. There is. Square conduits allow conduits to be closely connected to form multi-row, multi-stage conduits, so they have the advantage of requiring less earth and sand to be dug up and shortening the construction period when burying conduits. For this reason, as part of disaster prevention measures in recent years, cable laying methods using square conduits have been attracting attention instead of cable laying on utility poles, and square conduits are often used, especially in large cities. .

In the case of rectangular conduit, there is a large step between the small diameter section and the large diameter section, so when inserting a communication cable etc. into the rectangular conduit, the communication cable may get caught on the step between the small diameter section and the large diameter section. There may be a problem that the line cannot be connected. On the other hand, a double wall rectangular conduit has been proposed in which an inner tube is provided inside the conduit so that communication cables can be easily routed inside the conduit.

On the other hand, there are cases where the electric wire cable is branched from a laying structure in which the electric wire cable is inserted through the electric conduit. At this time, the need for a protective member for cable extraction with excellent water-stopping properties that can be easily attached to the cut portion of the conduit by cutting a portion of the conduit is increasing more than ever. It's increasing.

An example of an underground pipe for branching such cables is an underground pipe in which the inside of the pipe is divided into two by a separation plate, and the main cable is placed in one part, and the branch cable branched from the main cable is arranged and protected in the other part. A buried pipe has been proposed (Patent Document 1). In the underground pipe of Patent Document 1, both ends of the separation plate in the width direction abut against the inner wall of the underground pipe to vertically divide the inside of the pipe into two, and an arc-shaped plate is provided that contacts the inner wall of the underground pipe. In this underground pipe, a branch pipe joint is formed in the middle of the pipe line, and the branch cable inside the pipe is drawn out to the branch pipe through this branch pipe joint.

Furthermore, as another structure for a cable branch, a structure of a joint having a protective tube or a branch pipe made of a highly anticorrosive synthetic resin into which a communication cable is inserted has been proposed (Patent Document 2). Inside this protective tube, a net-like material that is divided into upper and lower parts is provided in the longitudinal direction, and the main cable is arranged in the lower space, and the lead-in cable is arranged in the upper space. Further, a branch pipe is provided that projects obliquely upward with respect to the upper space.

Furthermore, a piping branch cover provided at a piping branch portion of a protection tube through which a cable or the like is routed has been proposed (Patent Document 3). In the piping branch section of Patent Document 3, the main pipe and the branch pipe are held by a piping branch cover with an open bottom. The main pipe is held by the main pipe holding part of the pipe branch cover, and a branch pipe holding protrusion is provided on the inner surface near the tip of the branch pipe holding part. The waveform on the outer circumference of the branch pipe inserted into the branch pipe holding portion is locked and fixed by the branch pipe holding protrusion.

Further, when a cable is drawn to a new customer, a construction method has been proposed in which the inner pipe is branched without installing a hand hole at the location where the inner pipe is branched (Patent Document 4). This cable branching construction method is a branching construction method in which an inner pipe housed in an outer pipe is branched. Specifically, first, an opening is formed in the outer tube, and a predetermined length of the inner tube to be branched is cut using the opening. Next, a branching member is attached to each end of the excised inner tube so that the ends communicate with each other, and the inner branch tube is passed through the opening and protrudes to the outside of the outer tube. Then, a branched structure can be obtained by inserting the inner branch pipe into the outer branch pipe and sealing the opening with the saddle.

Japanese Patent Application Publication No. 2007-143394 Japanese Patent Application Publication No. 2006-174544 Japanese Patent Application Publication No. 2011-041395 Japanese Patent Application Publication No. 2004-080953

However, the structure described in Patent Document 1 is a pipe divided into upper and lower halves with a branch pipe joint formed in the middle of the pipe. Moreover, the structure described in Patent Document 2 and Patent Document 4 is an inner tube or a protective tube having a branch portion. All of these have an integral cylindrical structure with a rigid Y-shaped branch, and if you try to use this to take out the cable, you will not be able to easily assemble the removal member. There is a problem.

On the other hand, Patent Document 3 relates to a cover member that is easily attachable and detachable, but since the cover member does not cover the entire main pipe except for the branch part, there is a risk that water may enter through the gap between the contact surface of the main pipe and the cover. There is also a problem with water stopping properties. In other words, Patent Document 3 is structurally just a cover that closes the opening of the branch. As described above, none of the inventions disclosed in Patent Document 1 to Patent Document 4 described above have excellent assembly workability, and there are also problems in water-stopping properties.

The present invention has been made in view of these problems, and includes a protective member for taking out cables with excellent assembly workability and water-stopping properties, a conduit of a rectangular electric conduit using the same, and a conduit of a rectangular electric conduit using the same. The object of the present invention is to provide a structure for taking out electric wires or cables, and a laminated structure for conduits of rectangular conduits.

In order to achieve the above-mentioned object, a first invention provides a protection member for taking out a cable, which is formed by combining two half-split members, and further, the half-split members are fixed by a fixing member, The split member is a semi-cylindrical member in which a large-diameter storage portion, a cylindrical portion, and a large-diameter storage portion are formed in order in the tube axis direction, and one of the half-split members is such that the cylindrical portion is formed at a predetermined angle. The other half-split member is a semi-cylindrical member having a cylindrical branch portion that branches at a cylindrical portion, and the other half-split member is a semi-cylindrical member in which the cylindrical portion does not have a branch portion, and the large diameter of the half-split member is The section storage section has a substantially U-shaped outer periphery with rounded corners so that the large diameter section of the rectangular conduit tube can be stored therein, and the section storage section has a substantially U-shaped outer periphery with rounded corners, and a portion outside the cylindrical section excluding the branch section. A locking protrusion and a locking recess that are formed to have a large diameter and that can be fitted into each other are provided at both ends of the substantially U-shaped large diameter storage portion in the width direction of each of the two half-split members. and fitting the locking protrusion into the locking recess by abutting both widthwise ends of the substantially U-shape of the large-diameter storage portions of the two half-split members. The entire circumference of the inner circumferential surface of the cylindrical portion excluding the branch portions of the two half-split members and the inner circumferential surface of the large diameter portion storage portion on both sides of the cylindrical portion, A cable having a water-stopping member bonded thereto, and fixed by a fixing member on the outer periphery of the cylindrical part near both ends in the tube axis direction when the two half-split members are combined. This is a protective member for removal.

The water stop member is preferably a rubber packing or a nonwoven fabric containing a water-expandable member.

The branch portion may be formed in one of the two half members so as to protrude in a cylindrical shape from the cylindrical portion at a predetermined angle.

The fixing member may be a stretchable band-shaped fixing member, and the outer periphery of the cylindrical portion near both ends in the tube axis direction may be fixed by the fixing member.

The fixing member is a C-ring having an expandable spring property, and by arranging the C-ring on the outer periphery near both ends of the cylindrical part in the tube axis direction, the diameter-reducing force of the C-ring causes The cylindrical portion may be fixed.

A threaded portion consisting of a plurality of threads substantially parallel or spiral in the circumferential direction is formed on the inner periphery of the C-ring, and a threaded portion that can be fitted with the threaded portion is formed on the outer periphery of the cylindrical portion. A threaded portion on the inner periphery of the C-ring may be fitted into a threaded portion on the outer periphery of the cylindrical portion.

A protruding portion having an outer diameter slightly larger than the outer diameter of the cylindrical portion is provided on the outer periphery of the cylindrical portion near the inner side of the position where the band-shaped fixing member or the C-ring is arranged in the cylindrical portion. The band-shaped fixing member or the C-ring may be fixed between both ends of the cylindrical part and the protruding part, respectively. Here, the protruding portion may be formed on the entire outer circumference of the cylindrical portion, or may be formed on a part of the circumference.

A connecting portion may be formed on an outer periphery near a tip of the branching portion, and a branching electric conduit may be connected to the connecting portion.

In this case, the connecting portion is formed in two stages, a lower connecting portion having a large diameter and an upper connecting portion having a smaller diameter than the lower connecting portion, and either of the two connecting portions, the lower connecting portion and the upper connecting portion. A branch conduit may be connected to the branch conduit.

The connecting portion may be formed with either a spiral threaded portion or a male connecting portion having a ring member and a water stop member.

When the electrical conduit is not connected to the connection part, it may be possible to cover the connection part with a water stop valve.

The distance in the tube axis direction of the large diameter portion storage portions formed on both sides of the half member is set to a length that matches the arrangement interval of the large diameter portions of the rectangular electric conduit that is fixed to the cable extraction protection member. may be done.

According to the first invention, the cable extraction protection member can be obtained by simply combining two half-split members and fixing them with fixing members on the outer periphery of the cylindrical part near both ends in the tube axis direction. Therefore, it is easy to assemble. At this time, since a locking protrusion and a locking recess that can be fitted into each other are respectively formed, positioning of the members is also easy. In addition, water-stopping material is bonded to the inner circumferential surface of the cylindrical portion of the two half-split members and the inner circumferential surface of the large-diameter storage portion on both sides of the cylindrical portion, so water-stopping properties are achieved. can be ensured.

In this way, the cable extraction protection member 1 has a simple structure and a reliable structure because the fitting and fixing structure between the upper half member and the lower half member and the structure for ensuring water-tightness are formed independently. Both effects can be obtained without mutually inhibiting each other. Furthermore, the present cable extraction protection member can be applied to both newly constructed conduits and existing conduits.

Moreover, if the water-stopping member is a rubber packing or a nonwoven fabric containing a water-expandable member, high water-stopping properties can be ensured.

Moreover, by forming the branch part so as to protrude cylindrically from the cylindrical part at a predetermined angle, it is possible to connect a branching electric conduit near the tip of the branch part.

In addition, the fixing member is a stretchable band-like fixing member, and by fixing the outer periphery near both ends of the cylindrical part in the tube axis direction with the fixing member, the two halves can be reliably assembled. Can be fixed.

In addition, the fixing member is a C-ring that has an expandable spring property, and by arranging the C-ring on the outer periphery near both ends of the cylindrical part in the tube axis direction, the diameter-reducing force of the C-ring allows the cylindrical can be fixed.

Further, a threaded portion consisting of a plurality of threads substantially parallel to the circumferential direction or spirally is formed on the inner periphery of the C-ring, and a threaded portion that can be fitted with the threaded portion is formed on the outer periphery of the cylindrical portion. Once formed, the threaded portion on the inner periphery of the C-ring and the threaded portion on the outer periphery of the cylindrical portion can be fitted together. Therefore, it is possible to reliably fix the two half-split members in an assembled state, and to suppress displacement of the C-ring.

The threaded part formed on the inner periphery of the C-ring may be a plurality of threads substantially parallel to the circumferential direction or a spiral thread, and if any of the threads is formed on the cylindrical part, the C-ring and the cylindrical part can be fitted together.

In addition to the above, instead of forming a threaded part in the cylindrical part, a projecting part may be formed near the inner side of the position where the band-shaped fixing member or C ring of the cylindrical part is arranged. It becomes possible to stabilize the fixing position of the two half-split members by a fixing member such as a C-ring, and further to prevent displacement of these fixing members. In addition, the said protrusion part should just be formed in at least one part on the circumference of a cylindrical part.

Further, if a connecting portion is formed on the outer periphery near the tip of the branching portion, a branching electric conduit can be connected to the connecting portion.

Furthermore, if the connecting portion is formed in two stages: a lower connecting portion with a larger diameter and an upper connecting portion with a smaller diameter than the lower connecting portion, the branch conduit can be connected to either of the two connecting portions. .

If the connection part is formed with either a spiral groove or a male connection part consisting of a retaining ring and a rubber packing, it is easy to connect the branching conduit to the connection part.

Moreover, by making it possible to cover the connection part with a stopcock, the connection part can be closed when the branching conduit is not connected to the connection part.

In addition, the distance in the tube axis direction of the large-diameter storage sections formed on both sides of the half-split member is set to a length that matches the spacing between the large-diameter sections of the rectangular conduit that is fixed to the cable extraction protection member. If so, the cable extraction protection member can be installed in the middle of the existing rectangular conduit conduit.

A second invention is a conduit of a rectangular electrical conduit having a cable extraction protection member according to the first invention, wherein square electrical conduit tubes are connected to both sides of the cable extraction protection member, and the cable extraction protection member is connected to both sides of the cable extraction protection member. The rectangular electric conduit conduit is characterized in that the large diameter portion of the rectangular electric conduit is stored in the large diameter portion storage portions at both ends of the protection member.

The rectangular electric conduit is a double wall rectangular electric conduit formed by fusing an inner tube to a small diameter portion of an outer tube, and the double wall rectangular electric conduit is connected to both sides of the cable extraction protection member. may be done.

According to the second invention, it is possible to insert the rectangular electrical conduit from both sides of the cable extraction protection member and connect the two to form a conduit.

Further, if the rectangular electric conduit is a double-walled rectangular electric conduit, as described above, since there are almost no irregularities inside the electric conduit, it is easy to insert a cable or the like into the conduit.

A third invention is a structure for taking out electric wires or cables from a conduit of a rectangular electric conduit according to the second invention, wherein a plurality of the electric wires or cables are inserted into the conduit of the rectangular electric conduit, This is a structure for taking out an electric wire or a cable from a conduit of a rectangular electric conduit, characterized in that either the electric wire or the cable is taken out from a branch part of the protection member for taking out the cable.

According to the third invention, the cable can be branched from the connecting portion in the conduit formed by inserting the rectangular electric conduit from both sides of the cable extraction protection member.

A fourth invention is a structure for taking out electric wires or cables from a conduit of a rectangular electric conduit according to the third invention, wherein the structure for taking out electric wires or cables from a conduit of a rectangular electric conduit according to the third invention is arranged at the top layer of a laminated structure of a conduit of a rectangular electric conduit stacked in multiple layers. This is a laminated structure of rectangular electrical conduits, which is characterized by the fact that

The electric wire or cable branched from the branch portion may be externally connected.

According to the fourth invention, a cable can be branched from a conduit of rectangular electrical conduits stacked in multiple layers.

At this time, the electric wire or cable branched at the branch part can be connected to the outside.

According to the present invention, there is provided a protective member for taking out cables with excellent assembly workability and water-stopping properties, a conduit line of a rectangular conduit using the same, a structure for taking out electric wires or cables from the conduit line of a rectangular conduit, and a rectangular electric wire. A laminated structure of pipe conduits can be provided.

(a) is a perspective view of the upper half member 2a, and (b) is a side view of the upper half member 2a. (a) is a perspective view of the lower half member 2b, and (b) is a side view of the lower half member 2b. FIG. 3 is a side view showing the cable extraction protection member 1; FIG. 3 is a side view showing the cable extraction protection member 1 fixed with a band-shaped fixing member 9; FIG. 3 is a side view showing the cable extraction protection member 1 fixed with a C ring 8; (a) is a front view of the C ring 8, (b) is a sectional view taken along line AA in (a), (c) is a front view of the C ring 8a, (d) is B in (c) -B sectional view. (a) is a side view showing the protection member 1 for cable removal to which a ring member and rubber packing are attached, and (b) is a side view showing the protection member 1a for cable removal. (a) is a side view showing the protection member 1b for cable removal, and (b) is a side view showing the protection member 1 for cable removal covered with the water stop valve 7. (a), (b) is a figure which shows the conduit of the rectangular electrical conduit 12 using the protection member 1 for cable extraction. The figure which shows the conduit of the double wall rectangular electric conduit 13 using the protection member 1 for cable extraction. FIG. 3 is a diagram showing a structure for taking out a cable from a conduit of a double wall rectangular electric conduit 13 using a protection member 1 for taking out a cable. (a) is a diagram showing a multi-row, multi-stage laminated structure 14 of rectangular electric conduits, and (b) is a diagram showing a multi-row, multi-stage laminated structure 14a of square electric conduits. FIG. 3 is a diagram showing a structure for pulling out a cable 11 from a multi-layer multi-layer laminated structure 14 of rectangular electrical conduits.

(First embodiment)
Hereinafter, a cable extraction protection member according to a first embodiment of the present invention will be described with reference to the drawings. The cable extraction protection member according to this embodiment is constructed by combining two half-split members and fixing the two half-split members with a fixing member.

FIG. 1(a) is a perspective view of the upper half member 2a, and FIG. 1(b) is a side view of the upper half member 2a. Further, FIG. 2(a) is a perspective view of the lower half member 2b, and FIG. 2(b) is a side view of the lower half member 2b.

The two upper half members 2a and the lower half members 2b are semi-cylindrical members in which a large diameter portion storage portion 3, a cylindrical portion 4, and a large diameter portion storage portion 3 are formed in order in the tube axis direction. . One of the upper half members 2a is a semi-cylindrical member having a cylindrical branch portion 5 in which a cylindrical portion 4 branches at a predetermined angle. Further, the other lower half member 2b is a semi-cylindrical member in which the cylindrical portion 4 does not have a branch portion. That is, the branch portion 5 is formed in one of the two half members so as to protrude in a cylindrical shape from the cylindrical portion 4 at a predetermined angle. Each half member will be explained in detail below.

First, the upper half member 2a will be explained. As described above, the upper half member 2a is a half in which the large diameter portion storage portion 3, the cylindrical portion 4, and the large diameter portion storage portion 3 are formed in order from one end to the other end. It is a cylindrical member, and the cylindrical portion 4 is provided with a branch portion 5 . Note that the upper half member 2a is made of, for example, a high-strength polyolefin resin such as high-density polyethylene or polypropylene. The branch portion 5 is formed to protrude in a cylindrical shape from the cylindrical portion 4 of the upper half member 2a at a predetermined angle. A connecting portion 6 to which a branching conduit can be connected is formed near the tip of the branching portion 5 . Details of the connecting portion 6 will be described later.

The large diameter portion accommodating portion 3 of the upper half member 2a is formed so that a substantially rectangular large diameter portion of a square electric conduit, which will be described later, can be stored therein. Specifically, the shape of the outer periphery of the large diameter storage portion 3 of the upper half member 2a is approximately U-shaped with rounded corners, and the outer periphery of the large diameter storage portion 3 of the upper half member 2a , reinforcing ribs are formed in the circumferential direction. Further, the large diameter portion storage portion 3 of the upper half member 2a is formed to have a larger outer diameter than the cylindrical portion 4 excluding the branch portion 5.

Large diameter portion storage portion protrusions 31 are formed as locking projections at both ends of the substantially U-shaped large diameter portion storage portion 3 of the upper half member 2a in the width direction. The large-diameter storage portion protrusion 31 becomes a fitting portion with a lower half member 2b, which will be described later.

Water-stopping members 34 are bonded to the entire inner peripheral surface of the large-diameter storage portion 3 on both sides of the cylindrical portion 4 of the upper half member 2a. Furthermore, it is desirable that the water stop member 34 be disposed on the inner circumferential surface of the cylindrical portion 4 excluding the branch portion 5 of the upper half member 2a. The water stop member 34 is, for example, a rubber packing or a nonwoven fabric containing a water-expandable member.

When the water stop member 34 is a rubber packing, for example, EP rubber, SBR, CR, NBR, ACM rubber, dynamically crosslinked elastomer such as EPDM/PP, etc. can be used.

Furthermore, when the water stopper member 34 is a water-swellable nonwoven fabric, for example, a nonwoven fabric containing polyester fibers, sodium polyacrylate fibers, and a binder resin can be used. In this case, the proportion of polyester fibers and sodium polyacrylate is desirably 30% to 70% by mass relative to the total of both 100% by mass. Further, in the water-swellable nonwoven fabric, it is desirable to use a binder resin in an amount of 1 to 10% by mass based on the total of both polyester fibers and sodium polyacrylate fibers.

Here, the water-swellable nonwoven fabric absorbs water, swells, and gels. In polymer chemistry, gel is defined as a polymer with a three-dimensional network structure that is insoluble in solvents, and its swollen product. , which has a crosslinked structure, exhibits finite swelling properties. The degree of swelling (swelling degree) depends on the crosslinking density, and the higher the crosslinking density, the lower the swelling degree. Swelling gel is a material form intermediate between a liquid and a solid, and by controlling its chemical composition and various factors, it can be changed from a viscous liquid to a state close to a solid, with viscosity and appropriate deformability. can be changed to Therefore, by swelling and gelling the water-swellable nonwoven fabric, it is possible to ensure water-stopping properties and at the same time create a state with excellent deformability, allowing excessive stress to be released.

Here, gelation is brought about by a crosslinked structure, but the formation of a crosslinked structure does not necessarily have to be caused by a crosslinked structure, but can also be caused by secondary bonding forces between specific units of different molecular chains, such as hydrogen bonds. It is possible. Furthermore, a crosslinked polymer having a three-dimensional network structure that has swelled and become a gel can shrink and return to its original state upon drying.

Next, the lower half member 2b will be explained. As shown in FIGS. 2(a) and 2(b), similarly to the upper half member 2a, the lower half member 2b is also stored in the large diameter portion in order from one end to the other end. It is a semi-cylindrical member in which a portion 3, a cylindrical portion 4, and a large-diameter storage portion 3 are formed. Further, as described above, the branch portion 5 is not formed in the cylindrical portion 4 of the lower half member 2b.

Further, similar to the upper half member 2a, the outer periphery of the large diameter storage portion 3 of the lower half member 2b is approximately U-shaped with rounded corners, and the large diameter portion of the lower half member 2b Reinforcing ribs are formed on the outer periphery of the storage portion 3 in parallel to the circumferential direction. Further, the large diameter portion storage portion 3 of the lower half member 2b is formed to have a larger outer diameter than the cylindrical portion 4. Note that, like the upper half member 2a, the lower half member 2b is also made of a high strength polyolefin resin such as high density polyethylene or polypropylene.

At both ends of the substantially U-shaped large diameter portion storage portion 3 of the lower half member 2b in the width direction, large diameter portion storage portion recesses 32 are formed as locking recesses. The large-diameter accommodating recess 32 can fit into the large-diameter accommodating protrusion 31 of the upper half member 2a described above. In this way, the two upper half members 2a and the lower half members 2b are provided with locking protrusions that can be fitted into each other and engaged with both ends of the approximately U-shaped width direction of the respective large-diameter storage portions 3. A locking recess is formed respectively.

FIG. 3 is a side view showing the cable extraction protection member 1 formed by combining two upper half members 2a and lower half members 2b. As shown in FIG. 3, by bringing the substantially U-shaped widthwise ends of the large diameter portion storage portion 3 of the two upper half members 2a and the lower half member 2b into contact with each other, the large diameter portion storage portion It is possible to fit the protrusion 31 into the large diameter section recess 32.

As shown in FIG. 2(a), water stop members 34 are bonded to the entire inner peripheral surface of the large-diameter storage portion 3 on both sides of the cylindrical portion 4 of the lower half member 2b. Furthermore, it is desirable that the water stop member 34 be disposed on the inner circumferential surface of the cylindrical portion 4 of the lower half member 2b. In this way, the inner circumferential surfaces of the cylindrical portion 4 excluding the branch portions 5 of the two upper half members 2a and the lower half member 2b, and the inner circumferential surfaces of the large diameter portion storage portions 3 on both sides of the cylindrical portion 4. It is desirable that the water stop member 34 be attached to the entire circumference.

FIG. 4 shows a state in which the two upper half members 2a and the lower half members 2b are combined, and the upper half member 2a and the lower half member 2b are located on the outer periphery near both ends of the cylindrical portion 4 in the tube axis direction. FIG. 2 is a side view showing the cable extraction protection member 1 fixed with a fixing member.

In the illustrated example, a stretchable band-shaped fixing member 9 is used as the fixing member. The band-shaped fixing member 9 fixes the outer periphery of the cylindrical portion 4 near both ends in the tube axis direction. Note that the band-shaped fixing member 9 is made of elastic rubber, for example. In this way, by tightening the vicinity of both ends of the cylindrical portion 4 in the tube axis direction with the band-shaped fixing member 9, pressure is applied to the fitting portion of the upper half member 2a and the lower half member 2b, and the fixing member 9 is securely secured. Watertightness can be ensured by fitting the two together.

Note that the fixing member is not limited to the band-shaped fixing member 9. FIG. 5 is a diagram showing a cable extraction protection member 1 using a C-ring 8 as a fixing member, FIG. 6(a) is a front view of the C-ring 8, and FIG. 6(b) is a diagram of FIG. ) is a sectional view taken along line AA. The C ring 8 is a substantially annular member with a portion cut off in the circumferential direction. The C ring 8 has expandable spring properties and is made of, for example, ABS resin, PP resin, hard vinyl chloride, a mixed resin of any of these and PC resin, a polymer alloy, or metal.

By arranging the C-ring 8 on the outer circumference near both ends in the tube axis direction of the cylindrical portion 4 of the upper half member 2a and the lower half member 2b, the diameter reducing force of the C-ring 8 causes the cylindrical portion 4 to can be fixed. In this way, similarly to the band-shaped fixing member 9, by tightening the vicinity of both ends of the cylindrical portion 4 in the tube axis direction with the C-ring 8, the fitting portion between the upper half member 2a and the lower half member 2b is secured. Pressure is applied to securely fit the two together and ensure water-tightness.

In addition, when the water-stopping member is a water-swellable nonwoven fabric, in addition to the effect of the tightening force of the C-ring 8 and the band-shaped fixing member 9, when the water-swellable nonwoven fabric absorbs water and swells and gels, Since the water-swellable nonwoven fabric deforms freely and expands at the same time to completely close off the water-stopping space in the vicinity of the placement part, the water-stopping property can be further enhanced by water absorption. At this time, since reinforcing ribs are formed on the outer periphery of the large-diameter storage section 3, even if the water-swellable nonwoven fabric absorbs water and swells and pressure is applied to the large-diameter storage section 3, the large-diameter storage section 3 The storage section will not be deformed.

Note that the inner circumferential surface of the C-ring 8 may be smooth, or may be threaded. FIG. 6(c) is a front view showing the C ring 8a, and FIG. 6(d) is a sectional view taken along the line BB in FIG. 6(c). A threaded portion 81 consisting of a plurality of threads substantially parallel to the circumferential direction is formed on the inner periphery of the C-ring 8a.

In this case, a threaded portion that can fit into the threaded portion 81 of the C-ring 8a is formed on the outer periphery of the cylindrical portion 4. The C-ring 8a is fixed to the cylindrical portion 4 by fitting the threaded portion on the inner periphery of the C-ring 8a to the threaded portion on the outer periphery of the cylindrical portion 4. By doing so, it is possible to suppress the C ring 8a from shifting from the vicinity of both ends of the cylindrical portion 4 in the tube axis direction.

Furthermore, the threaded portion formed on the inner periphery of the C-ring may be a spiral thread instead of a plurality of threads substantially parallel to the circumferential direction. If a mountain is formed, the two can be fitted together.

In addition to the above, although not particularly shown, there is a protrusion on the outer periphery of the cylindrical portion 4 near the inner side of the position where the C-ring 8 is disposed. The C-ring 8 may be prevented from slipping by providing a section and fixing the C-ring 8 between both ends of the cylindrical section 4 and the protruding section. In this case, there is no need to form a threaded portion on the inner periphery of the C-ring 8. Moreover, instead of arranging the C-ring 8 between both ends of the cylindrical part 4 and the protruding part, band-shaped fixing members 9 may be arranged respectively.

FIG. 7A is a diagram showing a state in which a ring member and a rubber packing for preventing slipping off are attached to the connecting portion 6. The connecting portion 6 is a male connecting portion consisting of a retaining ring and a rubber packing. Note that the retaining ring may be C-shaped with an opening, or may be annular. It is sufficient if it can be locked with a locking claw formed on the retaining ring. By combining it with a rubber gasket, it can be prevented from coming off and water can be stopped.

Note that as the rubber packing, for example, EP rubber, SBR, CR, NBR, ACM rubber, dynamically crosslinked elastomer such as EPDM/PP, etc. can be used.

FIG. 7(b) is a side view showing the cable extraction protection member 1a. The connection portion of the cable extraction protection member 1a is formed in two stages: a lower connection portion 61 having a large diameter and an upper connection portion 62 having a smaller diameter than the lower connection portion 61. A branch conduit can be connected to either of the two connection parts, the lower connection part 61 and the upper connection part 62. That is, branch electric conduits with different diameters can be connected.

Note that the structure of the connecting portion 6 is not limited as long as it can be connected to another branching conduit. For example, FIG. 8(a) is a side view showing a cable extraction protection member 1b in which the connecting portion 6 is a spiral threaded portion 71 in which a spiral groove is formed. In addition, when connecting a branching conduit to the connecting part 6 in a spiral manner, a water-stopping member is attached to the surface of the threaded part of the connecting part 6, or a water-stopping member is attached to the inner surface of the branching conduit to be connected. It suffices if they are pasted together. In this way, it is desirable that the connecting portion 6 be formed of either a spiral groove or a male connecting portion consisting of a retaining ring and a rubber packing. In addition, in the following description, the cable extraction protection member 1 will be explained.

Rectangular electrical conduits, which will be described later, are arranged in the large-diameter storage portions 3 on both sides of the cable extraction protection member 1, and the cables inside the electrical conduits are branched from the branching portions 5. In this case, another branch conduit is connected to the branch portion 5. In addition, when a cable is not branched from the branch part 5 and a conduit is not connected to the connection part 6, the branch part 5 may be closed. FIG. 8(b) is a diagram showing a state in which a stopcock 7 is arranged at the tip of the branch part 5 and the branch part 5 is closed. In this way, it is possible to cover the connection part 6 of the branch part 5 with the water stop valve 7, and by covering the end of the connection part 6 with the water stop valve 7, the protection member 1 for taking out the cable can be protected. It can prevent rainwater and groundwater from entering the interior.

Next, a structure for taking out a cable from a conduit of a rectangular electrical conduit having the protection member 1 for taking out the cable will be described. FIG. 9(a) is a diagram showing a conduit line of a rectangular electric conduit. In addition, in the following description, illustrations of the water stop member and the fixing member will be omitted. As described above, the cable extraction protection member 1 is constructed by fixing the upper half member 2a and the lower half member 2b. In this state, rectangular electric conduit tubes 12 are connected to both sides of the cable extraction protection member 1.

The rectangular electric conduit 12 is an electric conduit in which large diameter portions having a substantially square cross section and small diameter portions having a generally circular cross section are alternately formed. The large diameter portions of rectangular electric conduit tubes 12 are stored in the large diameter portion storage portions 3 at both ends of the cable extraction protection member 1, respectively. That is, the rectangular electric conduit tubes 12 are arranged facing each other at a predetermined distance from each other.

Here, the distance in the tube axis direction of the large diameter storage portions 3 formed on both sides of the upper half member 2a and the lower half member 2b (distance between large diameter storage portions 33) is the distance between the cable extraction protection member 1 The length may be set to match the spacing between the large diameter portions of the rectangular electric conduit 12 to be fixed. By doing this, even if the small diameter portion of the existing square conduit 12 is cut, the distance between the large diameter portions of the cable extraction protection member 1 can be adapted to the cut portion of the existing conduit. This makes it possible to appropriately arrange the cable extraction protection member 1.

Note that, as shown in FIG. 9(b), two small protrusions may be formed approximately at the center of the small diameter portion. Using the groove between these two small protrusions as a guide, the square electric conduit 12 can be easily cut. Although it is desirable that a cutting groove be formed in the center for cutting as described above, such protrusions and grooves may not be formed. Further, as shown in FIG. 9(b), a predetermined number of cables 11 are connected to the branch portion 5 of one upper half member 2a from either of the rectangular conduit tubes 12 connected to both sides of the cable extraction protection member 1. It can also be taken out from.

Further, the rectangular electric conduit 12 may be a double-structure rectangular electric conduit instead of a single-layer rectangular electric conduit as shown in FIGS. 9(a) and 9(b). In the example shown in FIG. 10, instead of the rectangular conduit 12, a double wall rectangular conduit 13 is connected to the cable extraction protection member 1. That is, a conduit of the double-walled rectangular electric conduit 13 using the cable extraction protection member 1 is formed. The double wall rectangular electric conduit 13 has an outer tube having the same shape as the rectangular electric conduit 12, and an inner tube having a substantially circular cross section disposed inside the outer tube, so that the two are integrated. More specifically, the outer surface of the inner tube, which is a circular tube, is fused and integrated with the inner surface of the small diameter portion of the outer tube, which has the same shape as the rectangular electric conduit 12.

In this way, by connecting the double wall rectangular electric conduit 13 to both sides of the cable extraction protection member 1, a conduit of the double wall rectangular electric conduit 13 is formed. Moreover, in the conduit of the rectangular electric conduit, a plurality of electric wires or cables ( In the illustrated example, a cable 11) is inserted.

FIG. 11 is a diagram showing a structure for taking out electric wires or cables from a conduit of a rectangular electric conduit. The illustrated example shows a structure for taking out electric wires or cables from the conduit of the rectangular conduit using the double-walled rectangular conduit 13, but the rectangular conduit 12 also has a similar configuration.

A predetermined number of cables 11 are taken out from the branch portion 5 of one of the upper half members 2a from any of the double-walled rectangular conduits 13 connected to both sides of the protection member 1 for taking out the cables. As described above, a branching conduit (not shown) is connected to the connecting part 6 of the branching part 5, and the branched cable 11 is inserted through the branching conduit through the branching part 5. Note that the branching electric conduit only needs to be formed with a female fitting part that can fit into the connecting part 6.

Next, the laminated structure of the rectangular electric conduit line will be explained. FIG. 12(a) is a diagram showing a multi-layer, multi-layer laminated structure 14 of rectangular electrical conduits. The multi-row, multi-stage laminated structure 14 of rectangular electric conduits is constructed by laminating conduits of a plurality of rectangular electric conduits 12. Note that instead of the rectangular electric conduit 12, a double-walled rectangular electric conduit 13 may be used. Furthermore, the number and size of the rectangular electrical conduits 12 are not limited to the illustrated example.

In the laminated structure 14 of multi-row, multi-stage rectangular electrical conduits, the structure for taking out electric wires or cables from the conduit of the rectangular electrical conduits is placed in the top layer of the multi-row multi-stage multi-layered structure of the conduit of the rectangular electrical conduits 12. Laminated. In addition, the branch part 5 of the protective member 1 for taking out the cable in the multi-layer, multi-stage laminated structure 14 of the rectangular electric conduit is arranged toward the side. By doing so, the cable inside the rectangular electric conduit connected to the cable extraction protection member 1 can be taken out from the branch part 5 and branched. Note that the electric wire or cable branched from the branch portion 5 may be further connected externally.

Note that the branch portion 5 does not necessarily have to be arranged laterally. For example, as shown in FIG. 12(b), a multi-layer multi-layered laminated structure 14a of rectangular conduit tubes has a structure in which the branch part 5 of the cable extraction protection member 1 disposed at the top level is disposed upward. Good too. Even in this case, the cable inside the rectangular electric conduit connected to the cable extraction protection member 1 can be taken out from the branching part 5 and branched. When the above-mentioned multi-thread, multi-tiered electrical conduits have multiple product sizes, it is desirable to stack electrical conduits with smaller product dimensions on top so that the stacked stacked structure is stable. When the product sizes of the electrical conduits that are stacked in multiple strips and in multiple stages as described above are different, it is desirable to stack electrical conduits with smaller product dimensions on the upper stage so that the stacked layered structure is stable.

FIG. 13 is a schematic diagram showing a state in which the cable 11 is laid from a multi-layer multi-layered laminated structure 14 of rectangular electric conduits to a customer. The laminated structure 14 of multi-stranded and multi-tiered rectangular electrical conduits is buried underground. A portion of the cable 11 is taken out from inside the conduit of the rectangular electric conduit 12 via the branch portion 5 .

A branch conduit 15 is connected to the branch portion 5 of the cable extraction protection member 1 . The branch conduit 15 is laid from the rectangular conduit to the customer. Therefore, some of the cables 11 can be branched from the multi-layered multi-layer laminated structure 14 of rectangular electric conduits and laid to the customer.

As described above, according to the present embodiment, the large-diameter accommodating projection 31 of one upper half member 2a fits into the large-diameter accommodating recess 32 of the other lower half member 2b. It never shifts. Moreover, the upper half member 2a and the lower half member 2b can be reliably fixed by the fixing member.

In addition, the water stop member can prevent rainwater or groundwater from entering the inside of the rectangular electrical conduit placed inside from the joint surface or the like of the upper half member 2a and the lower half member 2b or the inner surface. . In this way, the cable extraction protection member 1 has a simple structure because the fitting and fixing structure between the upper half member 2a and the lower half member 2b and the structure for ensuring water-tightness are formed independently. , both effects can be reliably obtained without mutually inhibiting each other.

Further, by using the cable extraction protection member 1, the electric wire or cable 11 can be appropriately extracted from a required position as needed. In this case, as mentioned above, since it has water-stopping properties, it can be extremely effectively applied when constructing a new pipeline or when attaching to an existing pipeline.

Further, since the cable extraction protection member 1 can connect square electric conduits (the square electric conduit 12 and the double-walled square electric conduit 13), the square electric conduits can be stacked in multiple layers in close contact with each other. In this way, since it is possible to form a conduit of square electric conduits, the amount of earth and sand to be dug up is small and the construction period is short when burying square electric conduits.

In addition, by matching the distance 33 between the large-diameter storage parts of the cable extraction protection member 1 with the distance between the large-diameter parts of the rectangular conduit, it can be used not only when installing a new conduit for the rectangular conduit. Even after the conduit of the rectangular conduit is laid, the cable extraction protection member 1 can be easily installed by simply cutting the small diameter part of the existing rectangular conduit to a predetermined length. It is easy to apply to existing pipelines and does not require re-construction of other parts of existing pipelines, allowing for efficient construction.

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 limited to the embodiments described above. It is clear that those skilled in the art can come up with various changes and modifications within the scope of the technical idea stated in the claims, and these naturally fall within the technical scope of the present invention. It is understood that it belongs.

1, 1a, 1b...Cable extraction protection member 2a...Upper half member 2b...Lower half member 3...Large diameter storage section 31...Large diameter storage section protrusion 32... ...Large diameter storage part recess 33...Distance between large diameter storage parts 34...Water stop member 4...Cylindrical part 5...Branch part 6...Connection part 61...Lower part Connection part 62... Upper connection part 7... Water stop valve 71... Threaded parts 8, 8a... C-ring 81... Threaded part 9... Band-shaped fixing member 11... Cable 12 ......Square conduit 13...Double-walled rectangular conduit 14, 14a...Multi-layer, multi-layered laminated structure of rectangular conduit 15...Branch conduit

Claims (17)

A cable extraction protection member formed by combining two half-split members, and wherein the half-split members are further fixed with a fixing member,
The two half-split members are semi-cylindrical members in which a large-diameter storage portion, a cylindrical portion, and a large-diameter storage portion are formed in order in the tube axis direction,
One of the half-split members is a semi-cylindrical member that has a cylindrical branch part where the cylindrical part branches at a predetermined angle, and the other half-split member has a cylindrical part that does not have a branch part. It is a semi-cylindrical member,
The large-diameter portion storage portion of the half-split member has a substantially U-shaped outer periphery with rounded corners so that a substantially rectangular large-diameter portion of a rectangular electric conduit can be stored therein, and The outer diameter is larger than that of the cylindrical part except for the cylindrical part,
A locking protrusion and a locking recess that can be fitted into each other are formed at both ends in the width direction of the substantially U-shape of the large-diameter storage portion of each of the two half-split members. The locking protrusion can be fitted into the locking recess by bringing both widthwise ends of the substantially U-shape of the large-diameter storage portion of the half-split member into contact with each other;
A water-stopping member is pasted on the inner circumferential surface of the cylindrical portion of the two half-split members except for the branching portion, and on the entire inner circumferential surface of the large-diameter storage portion on both sides of the cylindrical portion. are combined,
A protective member for taking out a cable, characterized in that, in a state in which the two half-split members are combined, the outer periphery of the cylindrical portion near both ends in the tube axis direction is fixed by a fixing member. The cable extraction protection member according to claim 1, wherein the water stop member is a rubber packing or a nonwoven fabric containing a water-expandable member. The branching portion is formed in one of the two half-split members so as to protrude cylindrically from the cylindrical portion at a predetermined angle. The protective member for cable extraction according to item 2. The fixing member is a stretchable band-like fixing member, and the outer periphery of the cylindrical portion near both ends in the tube axis direction is fixed by the fixing member. The protective member for cable extraction according to any one of the above. The fixing member is a C-ring having an expandable spring property, and by arranging the C-ring on the outer periphery near both ends of the cylindrical part in the tube axis direction, the diameter-reducing force of the C-ring causes The cable extraction protection member according to any one of claims 1 to 3, wherein the cylindrical part is fixed. A threaded portion consisting of a plurality of threads substantially parallel or spiral in the circumferential direction is formed on the inner periphery of the C-ring, and a threaded portion that can be fitted with the threaded portion is formed on the outer periphery of the cylindrical portion. 6. The cable extraction protection member according to claim 5, wherein a threaded portion on the inner periphery of the C-ring is fitted into a threaded portion on the outer periphery of the cylindrical portion. A protruding portion having an outer diameter slightly larger than the outer diameter of the cylindrical portion is provided on the outer periphery of the cylindrical portion near the inner side of the position where the band-shaped fixing member or the C-ring is arranged in the cylindrical portion. 7. The cable outlet according to claim 4, wherein the band-shaped fixing member or the C-ring is fixed between both ends of the cylindrical part and the protruding part, respectively. Protective member for use. A cable outlet according to any one of claims 1 to 7, characterized in that a connecting part is formed on an outer periphery near a tip of the branching part, and a branching conduit is connected to the connecting part. Protective member. The connecting portion is formed in two stages, a lower connecting portion having a large diameter and an upper connecting portion having a smaller diameter than the lower connecting portion, and a branching portion is provided at either of the two connecting portions, the lower connecting portion and the upper connecting portion. 9. The protective member for taking out a cable according to claim 8, wherein a conduit is connected to the protective member. The cable outlet according to claim 8 or 9, wherein the connecting portion is formed with either a spiral threaded portion or a male connecting portion having a ring member and a water stop member. Protective member for use. 11. The cable extraction protection member according to claim 10, wherein the connecting portion can be covered with a water stop valve when no electric conduit is connected. The distance in the tube axis direction of the large diameter portion storage portions formed on both sides of the half member is set to a length that matches the arrangement interval of the large diameter portions of the rectangular electric conduit that is fixed to the cable extraction protection member. The cable extraction protection member according to any one of claims 1 to 11. A rectangular electric conduit conduit having the cable extraction protection member according to any one of claims 1 to 12,
Square electric conduit tubes are connected to both sides of the cable extraction protection member, and the large diameter portions of the square electric conduit tubes are stored in the large diameter portion storage portions at both ends of the cable extraction protection member. Square conduit conduit. The rectangular electric conduit is a double wall rectangular electric conduit formed by fusing an inner tube to a small diameter portion of an outer tube, and the double wall rectangular electric conduit is connected to both sides of the cable extraction protection member. 14. The rectangular electrical conduit conduit according to claim 13. A structure for taking out electric wires or cables from the conduit of the rectangular electric conduit according to claim 13 or 14,
A plurality of the electric wires or cables are inserted into the conduit of the rectangular electric conduit, and one of the electric wires or cables is taken out from a branch part of the cable extraction protection member. structure for taking out electric wires or cables from conduits. The structure for taking out electric wires or cables from the conduit of the rectangular electric conduit according to claim 15 is arranged at the top of a stacked structure of the conduit of the rectangular electric conduit stacked in multiple layers. Laminated structure of rectangular conduit conduit. 17. The laminated structure of a rectangular electric conduit conduit according to claim 16, wherein the electric wire or cable branched from the branch part is connected to an outside.

Images