JPH084950A - Connection structure between concrete structure and buried pipe - Google Patents

Abstract

(57) [Abstract] [Purpose] Disperses the concentrated stress generated at the connection between the manhole and the buried pipe to prevent damage to the buried pipeline. [Structure] A state in which a receiving port 21 into which a flexible joint 50 connecting a support pipe 50 embedded in a wall surface 11 of a manhole 10 and an embedded pipe 41 is fitted is embedded in a concrete structure together with the support pipe 50. Since it has become
The shearing force is hardly applied to 0, and the support pipe 50 is prevented from being damaged.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connection structure between a buried pipeline buried in the ground and a concrete structure such as a manhole or a bridge pier.

[0002]

2. Description of the Related Art Sewage pipes, protective cables for power line cables, etc.
Normally, it is buried in the ground for a long distance. For buried pipelines buried underground, clean the inside of the pipeline,
For maintenance and inspection of the power line cable arranged in the pipeline, manholes are installed at appropriate distances and the buried pipe and the manhole are connected.

FIG. 10 is a sectional view showing an example of the structure of the connecting portion between the manhole and the buried pipe. A support tube 81 is supported on the wall surface 11 of the manhole 10 in a substantially horizontal state. The tip portion of the support tube 81 is in a state of extending outward from the wall surface 11 of the manhole 10, and the tip portion is inserted into a receiving port provided on one side portion of the joint 82. . An end portion of a buried pipe 83 forming a buried pipe line is inserted into a receiving port provided on the other side portion of the joint 82.

[0004]

In such a connection structure of the manhole 10 and the buried pipe 83, since the manhole 10 is formed on the concrete foundation 16, the manhole 10 itself is unlikely to sink. On the other hand, the soil 61 that covers the buried pipe 83 and the like around the manhole 10 may sink over time. Soil cover 6
Reference numeral 1 denotes a wall surface 11 of the manhole 10 and the manhole 10.
In order to sink along the side of the foundation 16 which supports the, it moves diagonally downward, as indicated by the arrow in FIG.

When the cover soil 61 sinks obliquely downward in this manner, a force is applied to the portion of the support pipe 81 supported by the manhole 10 in a substantially horizontal state and extending from the manhole 10.
As a result, bending stress acts on the support pipe 81 extending from the wall surface 11 of the manhole 10, and the support pipe 81
Is a part supported in the wall surface 11 of the manhole 10,
A shearing force acts on the portion extending from the wall surface 11.
When such bending stress and shearing force are applied to the support pipe 81, the support pipe 81 may be damaged when the subsidence amount of the soil 61 is large.

In particular, when the buried pipeline is a protective pipeline for a power line cable, since each of the buried pipelines is a multi-threaded pipe laid in parallel, each buried pipe and the manhole 10 are connected.
When the soil is connected and the soil is backfilled, the soil compaction operation cannot be performed uniformly and sufficiently, and the soil is likely to sink and damage each buried pipe. As a result, it is necessary to reinforce the support tube itself to have high strength, or to disperse it so that the stress of the soil cover is not concentrated and applied to the support tube.

The present invention solves such a conventional problem, and an object thereof is to disperse the concentrated stress generated in the connecting portion between the concrete structure such as a manhole and the buried pipe to thereby make the buried pipe etc. An object of the present invention is to provide a connection structure between a concrete structure and a buried pipe capable of preventing breakage of the pipe.

[0008]

A connection structure for a concrete structure and a buried pipe according to the present invention is a support pipe buried and supported in a concrete structure, a buried pipe buried in the ground, and a curved pipe. The support pipe and the buried pipe are respectively fitted into the receiving ports of the respective side portions, and a part of the receiving port into which the supporting pipe is fitted is placed in the concrete structure. And a flexible joint embedded therein, whereby the above object is achieved.

Further, the connection structure between the concrete structure and the buried pipe of the present invention can be in a curved state with the support pipe buried and supported in the concrete structure, the buried pipe buried in the ground. A flexible joint having flexibility, in which the support pipe and the buried pipe are respectively fitted in the receiving ports of the respective side portions, and concrete which surrounds the flexible joint and is integrated with the concrete structure. At least an upper part of the cushioning material is provided, and the above object is achieved thereby.

The cushioning material may be entirely surrounded by concrete integrated with the concrete structure.

[0011]

In the connection structure of the concrete structure and the buried pipe of the present invention, the support pipe and the buried pipe supported in the concrete structure are connected by a flexible joint having flexibility, Since the joint has a part of one receiving port where the tip of the support pipe is fitted and is buried in the concrete structure, the stress due to soil cover does not directly apply to the support pipe itself. Join a flexible joint. Since the flexible joint is embedded in the concrete structure and is supported in a cantilever state, it is in a bent state due to the stress of the soil cover, and the support pipe is not damaged.

Further, when the flexible joint is surrounded by the cushioning material and the upper portion is covered with concrete integrated with the concrete structure, no shearing force is applied to the support pipe and the stress applied to the support pipe is remarkably increased. Will be reduced. The flexible joint itself is also protected by the cushioning material.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a cross-sectional view showing a connection structure between a manhole 10 which is a concrete structure and a buried pipeline 40 in which a power line cable is inserted and protected.

The manhole 10 is installed on a foundation 16 such as concrete. A support pipe 50 is supported in a horizontal state on the wall surface 11 of the manhole 10 connected to the buried pipeline 40 so as to penetrate the wall surface 11. The support tube 50 has a base end portion 51 close to the inside of the manhole 10,
It is in a state where the diameter is expanded like a trumpet, and this base end portion 51
Is embedded so as not to project from the wall surface 11, and the tip end portion 52 on the opposite side is slightly projected to the outside of the wall surface 11 of the manhole 10.

The end surface of the base end portion 51 of the support tube 50, which has a flared diameter, is flush with the inner surface of the wall surface 11 of the manhole 10. The base end portion 51 having the expanded diameter is used as the support tube
It is provided in 1 to facilitate insertion of the power line cable.

A flexible joint 2 is attached to the tip portion 52 of the support tube 50.
0 is fitted. The flexible joint 20 is provided with receiving ports 21 on the respective side portions, and a flexible portion 22 having flexibility is provided in a central portion 22 between the receiving ports 21. A support pipe 50 is provided in one receiving port 21 of the flexible joint 20.
The front end portion 52 of the above is fitted, and the end portion of the receiving port 21 is embedded in the wall surface 11 of the manhole 10. An end of a buried pipe 41 forming a buried conduit 40 is fitted in the receiving port 21 provided on the other side of the flexible joint 20.

FIG. 2 is a vertical sectional view of the flexible joint 20. This flexible joint 20 is disclosed in, for example, Japanese Patent Laid-Open No. 5-318620, and is supported in the end portion of the buried pipe 41 that constitutes the buried pipe passage 40 on each side in the axial direction and in the wall surface 11 of the manhole 10. 21 into which the fixed support tube 50 is inserted
Are formed respectively. A flexible portion 22 having flexibility so as to be in a curved state is provided at an axial center portion between the receiving ports 21. The flexible portion 22 has an outer diameter equal to that of each of the receiving ports 21 and an inner diameter of each of the receiving ports 2.
The inner diameter is smaller than the inner diameter of 1, and a step portion 26 is formed with the inner peripheral surface of each receiving port 21. The inner diameter of the flexible portion 22 is equal to the outer diameters of the support pipe 50 and the embedded pipe 41 inserted into each receiving port 21.

Inside the tip of each receiving port 21, a metal plate 25 buried over the entire circumference is arranged as a reinforcing material.

On the outer peripheral portion of the flexible portion 22, three concave grooves 23 are formed over the entire circumference at appropriate intervals in the axial direction. Then, the elastic body 24 is fitted into each groove 23 over the entire circumference.

Each receiving port 21 and the flexible portion 22 are integrally formed of a synthetic resin such as unsaturated polyester resin or urethane resin. The elastic body 24 fitted in each groove 23 of the flexible portion 22 is made of a foam such as a polyolefin foam, a synthetic rubber foam, or a natural rubber foam.

The flexible joint 20 as described above includes the elastic members 24.
However, by compressing in the groove 23, it can be bent in a curved state.

The manhole 10 and the buried conduit 40 of this embodiment
The connection structure with and is formed as follows. First, as shown in FIG. 1, a through hole 12 is formed in the wall surface 11 of the manhole 10 corresponding to the embedding level of the embedding conduit 40. The through hole 12 is formed so that the support tube 50 is completely accommodated.
The inner diameter is slightly larger than the outer diameter of the support tube 50. Then, with the support tube 50 inserted in the formed through hole 12, the tip end portion 52 of the support tube 50 is inserted into one of the receiving ports 21 of the flexible joint 20 and the flexible joint 20.
The end of the buried pipe 41 is inserted into the other receiving port 21 of the.

At this time, the tip end side portion of the receiving port 21 of the flexible joint 20 fitted to the tip end portion 52 of the support tube 50 is made to enter the through hole 12 over half or more. In this state, the cement mortar 13 is placed between the through hole 12 and the support pipe 50. As a result, the support pipe 50 and the tip of the receiving port 21 of the flexible joint 20 fitted to the tip 52 of the support pipe 50 are embedded in the cement mortar 13 cast in the through hole 12. become. The cement mortar 13 is flush with the inner surface and the outer surface of the wall surface 11. Then manhole 10
The soil 61 is backfilled around the wall surface 11 of the.

In addition, the manhole 10 due to the settlement of the soil cover.
Although a shearing force is applied to the buried pipeline 40 at the end of the wall surface of the, the buried pipe 41 and the receiving port 21 of the flexible joint 20 have a double structure in this portion, so that the shearing force causes the buried pipe 40 to be buried. There is no risk of the pipeline 40 being destroyed.

The flexible portion of the flexible joint 20 is the manhole 10.
Since it is located on the outer side of the wall surface 11 of the flexible joint 22, the flexibility of the flexible portion 22 is not impaired, and the embedded pipe 41 at the end of the embedded conduit 40 inserted into the flexible joint 20 has flexibility. The state of being held is in a state of being supported by the wall surface of the manhole 10. The flexible joint 20 is embedded in the cement mortar 13 that constitutes the wall surface 11 of the manhole 10 so that one or more receiving ports 21 fitted into the support pipe 50 are embedded in the buried joint 40. Even if a large bending force acts on
The flexible joint 20 exhibits sufficient flexibility without breaking.

Flexible joint 20, support pipe 50 and buried pipe 4
In order to improve the sealing property of the connection portion with the support pipe 1, the support pipe 50 inserted into one receiving port 21 as shown in FIG.
Between the tip surface of the embedded pipe 41 and the step portion 26, and between the tip surface of the buried pipe 41 inserted into the other receiving port 21.
The flat ring-shaped water blocking packings 27 are attached by an adhesive or the like, and the cylindrical water blocking packings 28 fitted into the support pipes 50 and the buried pipes 41 are fitted in the tip portions of the respective receiving ports 21. Are combined. The water blocking packing 28 fitted in the tip of each receiving port 21 has a plurality of lip portions on the inner peripheral surface, and each receiving port 31
Has a flange portion that comes into contact with the front end surface of the. Each packing 27 and 28 is made of a rubber material such as EPDM or SBR.

FIG. 3 is a vertical sectional view showing another embodiment of the flexible joint used for connecting the support pipe 50 and the buried pipe 41. This flexible joint 30 was developed by the inventors of the present application (see Japanese Patent Application No. 4-283672), and JIS K
Young's modulus according to 7203 is 2700 kg / cm ² , J
It is a cast molded article of hard urethane with 100% elongation according to IS K 7113, and has a receiving port 31 into which the support pipe 50 and the buried pipe 41 are inserted, on each side. A flexible portion 32 is provided in the central portion between the receiving ports 31. The inner diameter of the flexible portion 32 is smaller than the inner diameter of each receiving opening 31, and a step portion 35 is formed between the flexible portion 32 and each receiving opening 31. On the outer peripheral surface of the flexible portion 32, two concave grooves 33 that are continuous over the entire circumference are formed at appropriate intervals in the axial direction.

Each concave groove 33 provided in the flexible portion 32 has a tapered side surface so that the width dimension of the opening is larger than the width dimension of the bottom surface. The flexible portion 32 is in a state in which it can be bent in a curved state by the concave grooves 33 provided on the outer peripheral surface. The wall thickness T ₁ between the bottom surface of each groove 33 and the inner peripheral surface of the flexible portion 32 is the flex angle required for the flexible portion 32,
It is determined in consideration of the strength required when such a flexible angle is obtained, but in order to obtain a flexible angle of 20 °, 0.8 times the wall thickness T _{2 of the} receiving port 31 It is preferable to set the value within the range of 1.3 times.

At the tip of each receiving port 31, a metal plate 34, which is continuous over substantially the entire circumference, is provided as a reinforcing material for preventing expansion of the diameter.
Are buried respectively.

Further, in order to stop the water between the flexible joint 30 and the support pipe 50 and the buried pipe 41 which are inserted into the respective receiving ports 31, the support pipe 50 and the buried pipe are provided in the tip portion of each receiving port 31. Cylindrical water blocking packings 36 fitted in 41 are fitted respectively. Each of the water blocking packings 36 has a plurality of lip portions on its inner peripheral surface, and also has a flange portion that abuts on the tip end surface of each receiving port 31. In addition, on the inner peripheral surface of the inner portion of each of the receiving ports 31, a water blocking packing 3 having a short cylindrical shape
7 is attached by an adhesive or the like in a fitted state. Each packing 27 and 28 is made of a rubber material such as EPDM or SBR.

Like the flexible joint 20 shown in FIG. 1, the flexible joint 30 having such a structure has one receiving port 31 fitted to the tip portion 52 of the support tube 50 and is embedded in the other receiving port 31. Wall surface 1 of manhole 10 with pipe 41 fitted
It is arranged in the through hole 12 provided in the No. 1 and is fixed by the cement mortar 13.

The flexible joint 30 of this embodiment has a larger flexible angle than that of the flexible joint 20 shown in FIG.
Even if a large force is applied by the cover soil 61, the buried pipe 41 can be reliably held without being damaged.

FIG. 4 is a sectional view showing a connection structure of another embodiment of the present invention, and FIG. 5 is a side view thereof. In this embodiment, in the through hole 12 provided in the wall surface 11 of the manhole 10,
The support tube 50 is arranged so that the side portion of the support tube 50 on the side of the distal end portion 52 extends from the wall surface 11 over about half the entire length of the support tube 50. Then, the cement mortar 13 is placed in the through hole 12 to fix the support pipe 50. In this state, one end 21 of the flexible joint 20 shown in FIG. 2 is fitted to the tip 52 of the support tube 50 protruding from the wall surface 11 of the manhole 10, and the other end 2 is fitted.
The end of the buried pipe 41 is inserted into 1. The flexible joint 20 is
The manhole 10 is located outside the wall surface 11 so as to be in a state of being appropriately spaced from the wall surface 11.

After that, a cylindrical elastic body 70 is fitted as a cushioning material to the support tube 50 and the flexible joint 20 in a state of protruding from the wall surface 11 of the manhole 10. The elastic body 70 is
The distal end of the receiving port 21 of the flexible joint 20 into which the embedded pipe 41 is inserted is fitted to the flexible joint 20 in a slightly extended state.

The elastic body 70 is composed of urethane foam, styrene foam, polyethylene foam, natural rubber, synthetic rubber and the like in two parts. The elastic body 70
Is not limited to such a configuration, and reactive urethane or the like may be injected at the site.

In this state, concrete 15 is cast around the elastic body 70, and the wall surface 1 of the manhole 10 is
It is made into the state integrated with 1. Thereby, the elastic body 7
0 is in a state of being held by the concrete 15 integrated on the wall surface 11 of the manhole 10. In addition, the shoulder portion of the upper end portion of the concrete 15 has a tapered surface 15a with a corner cut out. Therefore, concrete 15
Since the earth pressure is applied along the taper surface 15a of the, the earth pressure is applied to the buried pipe 41 extending from the concrete 15 in an inclined state with respect to the vertical, and the earth pressure causes the buried pipe 4
The shear force applied to 1 is reduced.

The concrete 15 integrated with the wall surface 11 of the manhole 10 may be configured so as to project from the wall surface 11 of the manhole 10, as shown by the chain double-dashed lines in FIGS. 4 and 5. The basis for holding 16
It is preferable to make the state of being placed on the foundation 16 in a continuous manner.

Such a connecting structure is in a state of being surrounded by the flexible joint 20 and the elastic body 70 fitted to the tip end portion of the support pipe 50 supported by the wall surface 11 of the manhole 10, and the buried pipe. Even if 41 becomes bent,
The bending stress applied to the support pipe 50 by the soil cover 61 is mostly absorbed by the flexible joint 20 and the elastic body 70. Further, since the elastic body 70 is also supported by the concrete 15 integrated with the manhole 10, almost no bending stress is applied to the support pipe 50. Further, since the support pipe 50 is covered with the elastic body 70 supported by the concrete 15 and the flexible pipe 20,
There is no fear of applying shearing force.

In this embodiment, the elastic body 70 made of synthetic resin is used as the cushioning material surrounding the flexible joint 20, but a metal spring may be used. It is also possible to use sand as a cushioning material, although there are some difficulties in construction. Furthermore, the flexible joint 30 shown in FIG. 3 can also be used.

Further, in this embodiment, the cylindrical elastic body 70 is used as the cushioning material, and the concrete 15 is placed so as to surround the entire circumference of the elastic body 70. As described above, the elastic body 70 is supported on the foundation 16 and the upper portion is fitted to the flexible joint 20, and only the upper portion of the elastic body 70 is covered with the concrete 15 integrated with the manhole 10. You may do it.

In each of the above embodiments, one buried pipe 4 is used.
Although the case where 1 is connected to the manhole 10 has been described, the present invention can be applied as a connection structure between a manhole and each buried pipe even when a plurality of buried pipes are connected to one manhole. In this case, when backfilling the cover soil, there is a risk that it will not be sufficiently compacted, and there is a risk that the cover soil will sink significantly.In such a case, however, be sure to prevent damage to the support pipe, etc. You can

The concrete structure is not limited to a manhole, but may be a bridge pier or the like. However, like the present invention,
The connection structure between the concrete structure and the buried pipe is a flexible joint for connecting the support pipe buried in the concrete structure and the buried pipe, and the receiving port in which the support pipe is fitted together with the support pipe, the concrete structure Even if it is not buried in the inside, by adopting the configuration shown as a reference example in FIG. 7 to FIG. 9, the shearing force applied to the support pipe is relaxed to some extent and the support pipe is not damaged. It can be alleviated to some extent.

In the connection structure between the concrete structure and the buried pipe shown in FIG. 7, the distance A from the wall surface 11 of the manhole 10 to the flexible joint 20 is less than 10 mm. With such a configuration, most of the shearing force acting on the buried pipe 40 due to the sinking of the soil is absorbed by the flexible joint 20, so that the shearing force applied to the support pipe 50 is substantially the same. It may be considered that the distance A from the wall surface 11 to the flexible joint 20 and the load of the covering soil added to the length L fitted into the receiving opening 21 of the flexible joint 20 of the support tube 50.
Since the distance A and the length L are sufficiently small, the shearing force applied to the support tube 50 can be alleviated to some extent and the damage to the support tube can be alleviated to some extent.

In the connection structure between the concrete structure and the buried pipe shown in FIG. 8, a plurality of flexible joints 20 are provided and the flexible joint 2 is provided.
The 0s are connected to each other via the short tube 90. With such a configuration, the shearing force acting on the buried pipe 40 due to the sinking of the soil cover the plurality of flexible joints 20.
Since it is sequentially absorbed by, the shearing force applied to the support tube 50 can be alleviated to some extent, and the damage to the support tube can be alleviated to some extent.

In the connection structure between the concrete structure and the buried pipe shown in FIG. 9, a shelf 111 extending from the wall surface 11 of the manhole is provided below the flexible joint 20. With such a configuration, it is possible to prevent the subsidence of the soil covering near the tip of the support pipe 50 to some extent due to the presence of the overhanging shelf 111, so that the shearing force applied to the support pipe 50 itself can be alleviated to some extent and the support pipe 50 can be supported. It is possible to alleviate the damage of the to some extent.

[0047]

As described above, the connection structure between the concrete structure and the buried pipe of the present invention is such that the support pipe is fitted to the flexible joint for connecting the support pipe buried in the concrete structure and the buried pipe. Since the combined receiving port is embedded in the concrete structure together with the support pipe, almost no shearing force is applied to the support pipe and damage to the support pipe is prevented. Further, by supporting the flexible joint by the cushioning material supported by the concrete integrated with the concrete structure, most bending stress applied to the support pipe is absorbed by the flexible joint and the cushioning material, and the shearing force is also absorbed. There is no danger of joining.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a connection structure between a concrete structure and a buried pipe of the present invention.

FIG. 2 is a partially cutaway front view showing an example of a flexible joint used for the connection structure.

FIG. 3 is a partially cutaway front view showing another example of the flexible joint used for the connection structure.

FIG. 4 is a cross-sectional view showing another embodiment of the connection structure between the concrete structure and the buried pipe of the present invention.

FIG. 5 is a side view of the connection structure.

FIG. 6 is a cross-sectional view showing still another embodiment of the connection structure between the concrete structure and the buried pipe of the present invention.

FIG. 7 is a cross-sectional view showing a reference example of a connection structure between a concrete structure and a buried pipe.

FIG. 8 is a cross-sectional view showing another reference example of a connection structure between a concrete structure and a buried pipe.

FIG. 9 is a cross-sectional view showing still another reference example of a connection structure between a concrete structure and a buried pipe.

FIG. 10 is a cross-sectional view showing a conventional example of a connection structure between a concrete structure and a buried pipe.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Manhole 11 Wall surface 12 Through hole 13 Cement mortar 15 Concrete 16 Foundation 20 Flexible joint 21 Receiving port 22 Flexible part 23 Recessed groove 24 Elastic body 30 Flexible joint 31 Receptive port 32 Flexible part 33 Recessed groove 40 Embedded pipe 41 Embedded pipe 50 Support tube

Claims (3)

[Claims] 1. A support pipe embedded and supported in a concrete structure, an embedded pipe embedded in the ground, and a flexible pipe having a curved state, wherein the support pipe and the embedded pipe are A concrete structure, comprising: a flexible joint that is fitted into each of the receiving ports of the respective side parts, and a part of the receiving port into which the support pipe is fitted is embedded in the concrete structure. And connection structure with the buried pipe. 2. A support pipe embedded and supported in a concrete structure, an embedded pipe embedded in the ground, and a flexible pipe which is curved, and the support pipe and the embedded pipe are A flexible joint fitted in each of the receiving ports of the respective side portions; and a cushioning material surrounding at least the flexible joint and at least an upper part of which is covered with concrete integrated with the concrete structure. A characteristic connecting structure between a concrete structure and a buried pipe. 3. The connection structure between a concrete structure and a buried pipe according to claim 2, wherein the cushioning material is entirely surrounded by concrete integrated with the concrete structure.