JP2013079532A - Flexible joint for manhole, and installation method for flexible joint - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive flexible joint for a manhole, which can secure cut-off performance over a prolonged period by having proper construction workability and which can suppress damage to the flexible joint itself and damage to the manhole, and an installation method for the flexible joint.SOLUTION: A flexible joint 1 for a manhole, which is installed in a part connecting the manhole and a box culvert 20 together, includes: a stationary plate part 30; a flexible plate part 31 which is formed in such a shape as to continue into the stationary plate part 30 and to be bent; an embedded plate part 32 which continues into the flexible plate part 31 and which is embedded in concrete configuring a side wall of the manhole; and a holding plate part 3 which holds the flexible plate part 31 in a predetermined shape when the flexible plate part 31 is not subjected to an external force.

Description

  The present invention relates to a flexible joint used at a connecting portion between a manhole and a pipe member for constructing a sewer pipe, a rainwater main line, and the like, and an installation method thereof.

  Conventionally, a flexible joint has been installed at a connecting portion between a manhole and a pipe member to ensure water stopping while allowing relative displacement between the two (for example, see Patent Documents 1 and 2).

  The flexible joint of Patent Document 1 includes a rubber band having a bellows portion and a stainless steel collar, and the collar is fixed to the through hole formed in the side wall of the manhole using concrete, while the rubber band One end is fixed to the collar and the other end is fixed to the outer peripheral surface of the pipe member. In Patent Document 1, for example, when the pipe member is displaced due to an earthquake or the like, the bellows portion of the rubber band is deformed, and the displacement is allowed.

  The flexible joint of Patent Document 2 includes a steel pipe disposed outside the pipe member, a rubber packing disposed between the steel pipe and the outer peripheral surface of the pipe member, and a steel pipe. And a bolt for pressing the rubber packing toward the pipe member side. The steel pipe is fixed to the through hole formed in the side wall of the manhole using concrete. In Patent Document 2, when the pipe member is displaced, the rubber packing is deformed, and the displacement is allowed.

JP 2002-332651 A JP 2009-114771 A

  However, Patent Document 1 uses a steel collar, and Patent Document 2 uses a steel pipe. Such steel parts are expensive, which causes high costs.

  In Patent Document 1, the steel collar is fixed to the manhole with concrete. However, the steel collar and concrete are difficult to deform themselves, so that they can follow a minute deformation such as a manhole. However, it is considered that it is difficult to ensure the water-stopping property at the interface between the steel collar and the concrete over a long period of time. The same applies to the structure in which the steel pipe of Patent Document 2 is fixed to a manhole.

  Furthermore, in Patent Document 1, it is necessary to insert the rubber band into the through hole of the manhole after fixing the rubber band to the duct member. At this time, since the rubber band has a bellows part and easily deforms, Therefore, a positioning member called a backup material must be provided, and the construction work is complicated.

  Moreover, in patent document 2, although it is necessary to insert a steel pipe in the through-hole of a manhole after fixing a steel pipe to a pipe line member, it will be in the state which the steel pipe protruded largely outside the pipe line member at this time. Therefore, it is conceivable that the steel pipe itself is deformed upon hitting the manhole, the bolt is deformed, and the manhole is damaged.

  The present invention has been made in view of the above points, and the object of the present invention is to provide a flexible joint that is low-cost, has good workability, and can ensure water-stopping performance over a long period of time. An object of the present invention is to provide a manhole flexible joint and a method for installing the manhole that can suppress damage to itself and manhole.

  In order to achieve the above object, the first aspect of the invention relates to the connection when the manhole and the pipe member are connected in a state where the end of the pipe member is inserted into the through hole formed in the side wall of the manhole. In the flexible joint for manholes installed in the part, a flexible member having water-stopping property is formed in an annular shape surrounding the pipe member, and is fixed to the outer peripheral surface of the pipe member; A flexible portion that is connected to the fixed portion, extends in a direction away from the outer peripheral surface of the pipe member in the radial direction and is bent, and a concrete interior that is connected to the flexible portion and forms the side wall of the manhole. And holding the flexible part in a predetermined shape before installation, and allowing deformation of the flexible part when an external force is applied during relative displacement of the manhole and the pipe member after installation. Configured to It and a lifting unit and is characterized in.

  According to this configuration, since the flexible portion is held in a predetermined shape by the holding portion during construction work, it is possible to prevent the shape from collapsing while eliminating the need for a backup material as in the conventional example. Become.

  Moreover, since it is the flexible part and embed | buried part which consist of a flexible member that protrudes on the outer side of a pipe line member, even if these contact | win a manhole, they will only deform | transform by bending. Thereby, a flexible part, a buried part, and a manhole are not damaged.

  Moreover, by embedding the buried portion having flexibility in concrete, the water stoppage at the interface is ensured over a long period of time as compared with the conventional steel parts.

  After the construction, for example, assuming that the pipe member is displaced with respect to the manhole, the fixed portion of the flexible joint and the embedded portion are relatively displaced, but at this time, the holding portion that receives the external force is flexible. Since the deformation of the portion is allowed, the flexible portion deforms so as to follow the displacement of the pipe line member. Accordingly, it is possible to achieve both water-stopping and flexibility while eliminating the need for steel collars and steel pipes as in the prior art.

  In a second aspect based on the first aspect, the embedded portion is formed to extend outward in the radial direction of the pipe member, and the distal end portion of the embedded portion intersects the extending direction of the embedded portion. A protrusion-shaped portion that protrudes in the direction to be formed is formed, and a non-vulcanized butyl rubber sealing material is provided on the outer surface of the protrusion-shaped portion.

  According to this configuration, the protrusion-shaped portion of the buried portion functions as an anchor, so that when the force in the direction of pulling out from the concrete acts on the buried portion, the buried portion is suppressed from coming out of the concrete. Furthermore, since the sealing material of the projection-shaped portion is in close contact with the concrete, water leakage from the interface between the buried portion and the concrete is more unlikely to occur.

  According to a third invention, in the first or second invention, the fixing portion is formed so as to extend along the outer peripheral surface of the pipe member in a center line direction and a direction in which an external water pressure acts. It is characterized by.

  According to this configuration, when water pressure acts on the fixed portion from the outside, the fixed portion extends in the center line direction along the outer peripheral surface of the pipe member and in the direction in which the external water pressure acts. It comes into close contact with the outer peripheral surface of the road member.

  According to a fourth aspect of the present invention, when the manhole and the pipe member are connected with the end of the pipe member inserted into the through hole formed in the side wall of the manhole, a manhole flexible joint is provided at the connecting portion. In the installation method to be installed, a manhole flexible joint is prepared by forming a flexible member having water-stopping in an annular shape surrounding the pipe member, and the pipe member includes the manhole flexible joint. A fixed portion that is fixed to the outer peripheral surface of the pipe member, a flexible portion that is connected to the fixed portion, extends in a direction away from the outer peripheral surface of the pipe member in the radial direction, and is bent in the radial direction; The embedded portion that is connected to the flexible portion and is embedded in the concrete that forms the side wall of the manhole, and the flexible portion before installation are held in a predetermined shape, and when the manhole and the pipe member are relatively displaced after installation. Under external force A holding part configured to allow deformation of the flexible part in some cases, and after fixing the fixing part of the flexible joint for manholes to the outer peripheral surface of the pipe line member, The member and the flexible joint for manhole are inserted into the through hole of the manhole, and then concrete is supplied into the through hole and hardened so that the embedded portion is embedded.

  In the first and fourth inventions, a flexible part connected to the fixed part fixed to the outer peripheral surface of the pipe member, an embedded part connected to the flexible part and embedded in the concrete constituting the side wall of the manhole, and flexible A holding portion that holds the portion in a predetermined shape is provided so that deformation of the flexible portion is allowed when receiving external force after installation. Thereby, the backup material at the time of construction becomes unnecessary, workability at the time of construction can be improved, and damage to the flexible joint and manhole at the time of construction can be avoided. Furthermore, since a steel collar or the like is not required, the cost can be reduced. Moreover, it is possible to ensure the water-stopping property at the interface between the concrete and the buried portion over a long period of time.

  According to the second invention, since the protruding portion is formed at the tip of the embedded portion, the embedded portion can be prevented from coming out of the concrete, and the outer surface of the protruding portion is made of non-vulcanized butyl rubber. Since the sealing material is provided, the water-stopping property at the interface can be further enhanced.

  According to the third invention, the fixing portion extends along the outer peripheral surface of the pipe member in the direction of the center line and in the direction in which the external water pressure acts. It can be pressed against the outer peripheral surface of the member, and the water stoppage can be further enhanced.

It is a figure which shows the cross-sectional structure of the manhole in which the flexible joint for manholes concerning embodiment of this invention was installed. It is a cross-sectional perspective view of the flexible joint for manholes. It is sectional drawing which expands and shows the connection part vicinity of a manhole and a pipe line member. It is a figure explaining the procedure which connects a pipeline member to a manhole. It is the a section enlarged view in Drawing 1 when a crack and a space | gap generate | occur | produce. It is the b section enlarged view in FIG. 1 when a crack and a space | gap generate | occur | produce. FIG. 4 is a view corresponding to FIG. 3 when the pipe member is displaced in the center line direction. FIG. 4 is a view corresponding to FIG. 3 when an external water pressure is applied.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following description of the preferred embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  FIG. 1 shows a cross-sectional structure of a manhole 10 and a box culvert (pipe member) 20 in which a manhole flexible joint 1 according to an embodiment of the present invention is installed. The manhole 10 and the box culvert 20 are buried in the ground, and the flexible joint 1 is installed at the connecting portion of the manhole 10 and the box culvert 20 to obtain a water stop effect and to allow relative displacement between the two. It has become.

  The manhole 10 extends in the vertical direction, and the lower side is a rectangular portion 10a formed so that the horizontal cross section is substantially rectangular, while the upper side is a cylindrical portion 10b formed in a cylindrical shape. A box culvert 20 is connected so as to penetrate the side wall of the rectangular portion 10a.

  Manholes 10 are assembly manholes that are assembled by transporting precast products made at the factory of the secondary product manufacturer to the construction site, and sites where the concrete is assembled and cast by placing concrete at the construction site. There are cases of hitting manholes, and the present invention can be applied to any case. This will be described later.

  The box culvert 20 is formed in a rectangular tube shape, and is arranged such that the center line is in a posture extending in a direction nearly horizontal, and a plurality of box culverts 20 are connected to form a water channel extending in a substantially horizontal direction. Is done. Box culvert 20 uses a precast product. Although not shown in the figure, normally, the water channel has a slope that is lowered toward the manhole 10, and the box culvert 20 is disposed so as to form this slope.

  Next, the structure of the flexible joint 1 will be described. The flexible joint 1 is an annular member formed by molding a flexible member having water-stopping property into a rectangular frame shape substantially similar to the outer shape of the box culvert 20, that is, an endless belt-like member. Examples of the flexible member include rubber and thermoplastic elastomer, but are not limited to these, and various materials having flexibility can be used.

  As shown in FIGS. 2 and 3, the flexible joint 1 includes a fixed plate portion (fixed portion) 30 fixed to the box culvert 20 and a flexible plate portion for imparting flexibility to the flexible joint 1. (Flexible portion) 31, embedded plate portion (embedded portion) 32 embedded in the side wall of manhole 10, and holding plate portion (holding portion) 33 for holding the shape of flexible plate portion 31. The fixed plate portion 30, the flexible plate portion 31, the embedded plate portion 32, and the holding plate portion 33 are integrally formed.

  The fixed plate portion 30 extends along the outer peripheral surface of the box culvert 20 in the center line direction (left-right direction in FIG. 3) of the box culvert 20, and extends over the entire circumferential direction of the box culvert 20. As shown in FIG. 2, a pair of water-stop protrusions 30 b and 30 b extending over the entire circumference in the circumferential direction of the flexible joint 1 are provided on the surface (back surface) 30 a on the box culvert 20 side of the fixed plate portion 30. The fixed plate portion 30 is formed with an interval in the width direction. The water stopping ridges 30b and 30b may be omitted when a water stopping material is interposed between the back surface 30a of the fixed plate 30 and the outer peripheral surface of the box culvert 20 (described later).

  A plurality of bolt insertion holes 30 c are formed through the fixing plate portion 30 at intervals in the circumferential direction. As will be described later, a bolt B (shown in FIG. 3) for fastening and fixing the fixing plate portion 30 to the box culvert 20 is inserted into the bolt insertion hole 30c.

  The flexible plate portion 31 is connected to the inner edge of the manhole of the fixed plate portion 30 and is bent as a whole. Specifically, the flexible plate 31 extends from the edge of the fixed plate 30 to the inside of the manhole while curving in a direction away from the outer peripheral surface of the box culvert 20 in the radial direction, and then curved toward the outside of the manhole. However, the cross section has a substantially U-shape that opens to the outside of the manhole. As a result, the flexible plate portion 31 can be deformed to both sides in the radial direction of the box culvert 20 and can be deformed to both sides in the center line direction. The thickness of the flexible plate portion 31 is set to the same level as the fixed plate portion 30.

  The embedded plate portion 32 is connected to the outer end portion of the flexible plate portion 31, extends so as to protrude outward in the radial direction of the box culvert 20, and extends over the entire circumference. The dimension in the protruding direction of the embedded plate portion 32 is set to be the same as the size in the radial direction of the flexible plate portion 31.

  Protrusion-shaped portions 32 a and 32 a that protrude in both directions (thickness direction) intersecting with the extending direction of the embedded plate portion 32 are formed at the distal end portion of the embedded plate portion 32. Each protrusion-shaped portion 32a is integrally formed on the side surface of the embedded plate portion 32, and the protruding height of the protrusion-shaped portion 32a from the side surface of the embedded plate portion 32 is approximately the same as the thickness of the embedded plate portion 32. Is set to

  A non-vulcanized butyl rubber sealing material 34 is provided in layers on the outer surfaces of the protrusions 32a and 32a. The seal material 34 extends from the outer surface of one projection shape portion 32a to reach the outer surface of the other projection shape portion 32a, and the outer surfaces of both the projection shape portions 32a and 32a are covered with a single seal material 34. ing.

The sealing material 34 is a conventionally well-known non-vulcanized adhesive plastic body containing butyl recycled rubber, and has an adhesive property that chemically bonds with the ready-mixed concrete as the ready-mixed concrete progresses. . About this chemical bond, the metal oxide (for example, CaO, SiO ₂ , Al ₂ O ₃ , Fe ₂ O ₃ ) contained in the cement is changed to a metal hydroxide in the presence of water in the ready-mixed concrete. It is believed that the metal hydroxide is due to an ionic reaction with the active groups (eg, carboxyl groups and hydroperoxide groups) of the regenerated butyl rubber particles. The sealing material 34 includes a filler and an adhesive material in addition to the butyl recycled rubber.

  The thickness of the main body of the embedded plate portion 32 is set to be approximately the same as the thickness of the fixed plate portion 30 and the flexible plate portion 31.

  The holding plate portion 33 extends from the end portion on the fixed plate portion 30 side of the flexible plate portion 31 to the end portion on the embedded plate portion 32 side of the flexible plate portion 31, and both end portions of the flexible plate portion 31. Are connected by the holding plate 33. The holding plate portion 33 and the flexible plate portion 31 constitute a hollow portion R having a closed cross section.

  When the flexible plate 31 is not subjected to an external force other than gravity before installation, the shape of the flexible plate 31 remains the above-described substantially U shape (predetermined shape). For example, when some member hits the embedded plate portion 32 or the flexible plate portion 13 or when a tensile force is applied during relative displacement of the manhole 10 and the box culvert 20 after installation described later. As described above, when an external force other than gravity is applied, the flexible plate portion 31 is allowed to be deformed. This can be realized by setting the thickness and shape of the holding plate portion 33. In the present embodiment, the thickness of the holding plate portion 33 is set to be thinner than the thickness of the fixed plate portion 30, the flexible plate portion 31, etc. For example, the thickness is about 1/3 of the fixed plate portion 30. It is.

  On the side surface of the holding plate portion 33 opposite to the flexible plate portion 31, a concave strip portion 33a is formed extending over the entire circumference in the circumferential direction. A fragile portion is formed in the holding plate portion 33 by the formation of the concave strip portion 33a.

  Next, the installation method of the flexible joint 1 comprised as mentioned above is demonstrated. First, the case where the manhole 10 is an assembly manhole will be described.

  As shown in FIG. 4A, the flexible joint 1 is attached to the end of the box culvert 20. In this case, a plurality of insert members 40 are embedded at intervals in the circumferential direction outside the end portion of the box culvert 20. This insert material 40 is the one in which the bolt B is screwed and screwed together.

  Thereafter, the end of the box culvert 20 is inserted into the flexible joint 1. At this time, the fixed plate portion 30 comes into sliding contact with the outer peripheral surface of the box culvert 20. Then, the bolt insertion hole 30 c of the fixed plate portion 30 is made to coincide with the insert material 40.

  After that, the pressing plate 41 is overlaid on the outer surface of the fixed plate portion 30. The holding plate 41 is provided over the entire circumference of the flexible joint 1. The holding plate 41 is formed with a hole (not shown) that coincides with the bolt insertion hole 30c.

  Next, the bolt B is inserted into the hole portion of the holding plate 41 and the bolt insertion hole 30 c of the fixed plate portion 30, and then screwed into the insert material 40. As a result, the entire circumference of the fixed plate portion 30 is fixed to the box culvert 20.

  In addition, it is preferable to interpose a water-stopping material such as a non-vulcanized butyl rubber sealer between the back surface 30 a of the fixed plate portion 30 and the outer peripheral surface of the box culvert 20.

  On the other hand, a through-hole 43 having a size capable of inserting the box culvert 20 in a state where the flexible joint 1 is fixed is formed in the side wall of the manhole 10. The shape of the through hole 43 is rectangular, and the size is set larger than the outer shape of the flexible joint 1 so that a predetermined gap is formed between the outer periphery of the flexible joint 1. deep.

  After the through hole 43 is formed, the box culvert 20 with the flexible joint 1 fixed thereto is inserted into the through hole 43 as shown in FIG. At this time, since the flexible joint 1 is fixed to the outer peripheral surface of the box culvert 20, the flexible plate portion 31 and the embedded plate portion 32 protrude from the outer peripheral surface of the box culvert 20. The plate portion 31 and the embedded plate portion 32 may hit the peripheral edge of the through hole 43. When the flexible plate portion 31 or the embedded plate portion 32 hits the peripheral portion of the through-hole 43, these are constituted by a flexible member, so that only the deformation is required, and the flexible plate portion 31 and the embedded plate portion 32 are damaged. Can be suppressed, and damage to the manhole 10 can also be suppressed.

  The insertion amount of the box culvert 20 is set so that the end surface 20a inside the manhole of the box culvert 20 is located on substantially the same plane as the inner surface 10d of the manhole 10. The box culvert 20 is held in this state.

  When the insertion of the box culvert 20 is completed, a cushion material 45 (shown in FIGS. 3 and 4C) made of a sponge or the like for protecting the pressing plate 41 and the bolt B is covered with the pressing plate 41 and the bolt B. Attach to.

  After the cushion material 45 is attached, as shown in phantom lines in FIG. 4B, the formwork D is installed and the ready-mixed concrete is placed between the through hole 43 of the manhole 10 and the outer peripheral surface of the box culvert 20. A space is formed for the purpose.

  Also, at this time, in order to improve the water-stopping property at the interface between the through hole 43 and the concrete placing portion 53 that becomes a part of the side wall of the manhole 10 by placing raw concrete described later, FIG. As shown only, a water expansion type sealing material S may be provided around the through-hole 43.

  In addition, since the flexible plate portion 31 is held in a predetermined shape by the holding plate portion 33, it is possible to suppress the shape of the flexible joint 1 from collapsing while eliminating the need for a backup material as in the conventional example. become.

  After that, ready-mixed concrete is placed. At this time, it is possible to prevent the concrete from entering the hollow portion R by providing the holding plate portion 33.

  When the ready-mixed concrete is hardened, the concrete placement portion 53 that becomes a part of the side wall of the manhole 10 is obtained, and the buried plate portion 32 of the flexible joint 1 is buried in the concrete placement portion 53. When the concrete is hardened, the sealing material 34 is adhered to the concrete, so that a high water-stopping property is obtained at the interface.

  After the concrete is hardened, the mold D is removed, and as shown in FIG. 3, the backup material 50 is inserted inside the manhole between the box culvert 20 and the concrete placing portion 53, and the caulking 51 is further applied.

  Next, the operation of the flexible joint 1 will be described.

  During normal operation, the fixed plate portion 30 is fixed to the outer peripheral surface of the box culvert 20, so that the water stoppage between the fixed plate portion 30 and the outer peripheral surface of the box culvert 20 is secured, and the embedded plate portion 32 is By being embedded in the concrete placement portion 53, water stoppage between the embedded plate portion 32 and the side wall of the manhole 10 is ensured. In particular, since the embedded plate portion 32 is formed of a flexible member that can be easily deformed, even if the concrete placing portion 53 is slightly deformed or displaced, the embedded plate portion 32 follows it and extends for a long period of time. Water stopping properties are obtained. In addition, since the sealing material 34 is bonded to the concrete placing portion 53, even higher water stoppage can be obtained.

  Moreover, in this embodiment, as shown in FIG.5 and FIG.6, even if a crack generate | occur | produces in the concrete placement part 53, a water stoppage can be ensured. In other words, in the process of ready concrete being placed and hardened, concrete subsidence accompanied by bleeding (a phenomenon in which sand and cement sink and water rises to the surface after the concrete is placed) occurs. It is easy to form voids in the lower layer. When voids are generated, the voids may become water passages and cause water leakage. However, since the sealing material 34 of this embodiment is attached so as to cover the protrusion-shaped portion 32 a, any portion of the protrusion-shaped portion 32 a is in any direction around the protrusion-shaped portion 32 a via the sealing material 34. Therefore, even when voids are generated, a high water-stopping property can be obtained.

  Further, even when the buried portion 32 embedded in the concrete placement portion 53 has a cross-sectional defect and a crack occurs in the concrete placement portion 53, the sealing material 34 is attached so as to cover the protruding shape portion 32a. The incoming water can be stopped at the portion of the sealing material 34.

  Further, as shown in FIG. 7, assuming that the box culvert 20 is displaced in the center line direction of the box culvert 20 (inside and outside the manhole) with respect to the manhole 10 due to an earthquake or the like, for example, the fixed plate portion 30 and the embedded plate portion 32. Are pulled to the opposite sides of the box culvert 20 in the center line direction. As a result, when the displacement amount is large, the holding plate portion 33 that has received an external force concentrates at the location where the concave portion 33a is formed and breaks starting from the concave portion 33a, allowing deformation of the flexible plate portion 31. To do. As a result, the displacement is allowed while ensuring the water-stopping property.

  In addition, you may abbreviate | omit the groove part 33a, and you may provide the stress concentration part of the shape where stress concentrates instead of the groove part 33a.

  When the amount of displacement is small, the holding plate portion 33 is not broken, but the deformation of the flexible plate portion 31 is allowed by deformation.

  At the time of displacement, a force is applied to the embedded plate portion 32 in the direction in which the embedded plate portion 32 is pulled out from the concrete placing portion 53. However, since the protruding portions 32a and 32a of the embedded plate portion 32 function as anchors, the embedded plate The part 32 can be prevented from coming off from the concrete placing part 53. Furthermore, it is difficult for the embedded plate portion 32 to come off even when the sealing material 34 is bonded to the concrete placing portion 53.

  Even when the box culvert 20 is displaced so that the center line thereof is inclined, the deformation of the flexible plate portion 31 is allowed and the water stoppage can be secured.

  When the box culvert 20 is displaced as shown in FIG. 7, the inner side of the manhole of the fixed plate portion 30 is pulled away from the outer peripheral surface of the box culvert 20. At this time, since the intermediate portion in the width direction of the fixing plate portion 30 is fixed by the bolt B via the holding plate 41, the holding plate 41 is separated from the outer peripheral surface of the box culvert 20 by the portion inside the manhole from the bolt B. It is pulled in the direction (arrow X direction). Then, with the bolt B as a fulcrum, the reaction force acts so as to press the portion outside the manhole from the bolt B of the pressing plate 41 in the direction in which it presses against the outer peripheral surface of the box culvert 20 (arrow Y direction). Thereby, since the manhole outer side part of the fixed plate part 30 press-contacts with the outer peripheral surface of the box culvert 20, water-stopping property improves compared with the normal time (shown in FIG. 3).

  In addition, as shown in FIG. 8, water pressure (external water pressure) due to groundwater or the like acts on the pressing plate 41 and the fixed plate portion 30 as indicated by an arrow W outside the manhole. Since the fixed plate portion 30 comes into pressure contact with the outer peripheral surface of the box culvert 20 by this water pressure, a high water-stopping property is obtained. 7 and 8, the cushion material 45 and the like are omitted.

  As described above, according to this embodiment, since the shape of the flexible plate portion 31 is held by the holding plate portion 33, workability during construction can be improved. Moreover, since the flexible plate part 31 and the burying board part 32 are comprised with the flexible member, the damage of the flexible joint 1 or a manhole can be avoided at the time of construction. Furthermore, since water-stopping can be ensured without using a conventional steel collar or the like, the cost can be reduced. In addition, it is possible to ensure the water-stopping property at the interface between the concrete placing portion 53 and the buried plate portion 32 over a long period of time.

  Moreover, since the projection-shaped portions 32a and 32a are formed at the tip of the embedded plate portion 32, the embedded plate portion 32 can be prevented from coming off from the concrete placing portion 53. Further, the protrusion-shaped portions 32a and 32a Since the sealing material 34 made of non-vulcanized butyl rubber is provided on the outer surface, the water stoppage at the interface can be further enhanced.

  Further, since the fixed plate portion 30 extends in the center line direction along the outer peripheral surface of the box culvert 20, the fixed plate portion 30 can be pressed against the outer peripheral surface of the box culvert 20 by using external water pressure. The aqueous property can be further increased.

  In the above embodiment, the case where the box culvert 20 is connected to the assembly manhole 10 has been described. However, as described above, the present invention can also be applied to an on-site manhole. In the case of an on-site manhole, a through-hole may be provided in advance on the side wall of the manhole, or a box culvert 20 to which the flexible joint 1 is fixed is installed on the site in advance, and then a manhole mold A frame may be installed to cast concrete.

  Moreover, in the said embodiment, although the whole flexible joint 1 was comprised with the same material, you may comprise only the holding plate part 33 with a material with low tear strength compared with another part, for example. When doing in this way, you may abbreviate | omit the groove part 33a.

  As described above, the flexible joint for manhole according to the present invention and its installation method absorbs the displacement even when an unequal displacement occurs due to, for example, an earthquake, etc. For example, it is desirable to be used for sewer pipes and rainwater trunks that require continuation of functions even during an earthquake.

1 Flexible joint for manhole 10 Manhole 20 Box culvert
30 Fixed plate part (fixed part)
30c Bolt insertion hole 31 Flexible plate part (flexible part)
32 Buried plate part (buried part)
32a Projection-shaped part 33 Holding plate part (holding part)
33a Concave portion 34 Sealing material 41 Holding plate 43 Through hole 53 Concrete placement portion B Bolt

Claims (4)

In the manhole flexible joint installed at the connecting portion when the manhole and the pipe member are connected in a state where the end of the pipe member is inserted into the through hole formed in the side wall of the manhole,
A flexible member having a water-stop property is formed in an annular shape surrounding the pipe member,
A fixing portion fixed to the outer peripheral surface of the pipe member;
A flexible portion that is connected to the fixed portion, extends in a direction away from the outer peripheral surface of the duct member in the radial direction, and is bent;
An embedded part that is connected to the flexible part and embedded in the concrete constituting the side wall of the manhole;
A holding part configured to hold the flexible part in a predetermined shape before installation, and to allow deformation of the flexible part when an external force is applied after the manhole and the pipe member are relatively displaced after installation. And a flexible joint for manholes. The flexible joint for manholes according to claim 1,
The embedded portion is formed so as to extend outward in the radial direction of the pipe member, and a protrusion-shaped portion protruding in a direction intersecting with the extending direction of the embedded portion is formed at the distal end portion of the embedded portion,
A manhole flexible joint, characterized in that a non-vulcanized butyl rubber sealing material is provided on the outer surface of the protruding portion. The flexible joint for manholes according to claim 1 or 2,
The flexible joint for manholes, wherein the fixing portion is formed so as to extend along the outer peripheral surface of the pipe member in a center line direction and a direction in which an external water pressure acts. In the installation method of installing the manhole flexible joint at the connecting portion when the manhole and the pipe member are connected in a state where the end of the pipe member is inserted into the through hole formed in the side wall of the manhole,
A manhole flexible joint is prepared by forming a flexible member having a water-stopping shape in an annular shape surrounding the pipe member,
In the manhole flexible joint, a fixed portion fixed to the outer peripheral surface of the pipe member;
A flexible portion that is connected to the fixing portion, extends in a direction away from the outer peripheral surface of the pipe member in the radial direction, and is bent in the radial direction;
An embedded part that is connected to the flexible part and embedded in the concrete constituting the side wall of the manhole;
A holding portion configured to hold the flexible portion before installation in a predetermined shape and to allow deformation of the flexible portion when an external force is applied after the manhole and the pipe member are displaced relative to each other after installation. And formed
After fixing the fixed portion of the manhole flexible joint to the outer peripheral surface of the pipe member,
The conduit member and the flexible joint for manhole are inserted into the through hole of the manhole, and then concrete is supplied into the through hole so that the embedded portion is embedded and cured. How to install a flexible joint.

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