JP3290549B2 - Connection structure and method of pipe to manhole - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure and a method for connecting a pipe to a manhole.

[0002]

2. Description of the Related Art A manhole formed from the surface of the earth is installed in the middle of a pipe buried underground. In general, the manhole has a concrete wall, and a pipe constituting a pipeline is firmly connected to the concrete wall.

[0003]

However, simply connecting the pipe body firmly to the concrete wall in this manner does not provide the connecting portion with the expansion and contraction performance, bending performance, and the like.
For this reason, when an earthquake or land subsidence occurs, it cannot follow up, and there is a problem that an excessive force is likely to be applied to the connection portion.

Accordingly, the present invention solves such a problem, and can provide a connecting portion with elasticity and bending performance.
It is an object to obtain a connection structure and a method of connecting a pipe to a manhole.

[0005]

In order to achieve this object, a connecting structure of a pipe to a manhole according to the present invention comprises a connecting pipe having one end fixed to a concrete wall constituting the manhole. Along with projecting outward, the connecting pipe is formed in a tapered shape that gradually decreases in diameter from the one end to the other end, and a distal end of a pipe constituting a pipe connected to the manhole is placed inside the connecting pipe. At the same time, a first lock ring is attached to the outer circumference of the distal end of the pipe body, and an annular projection that can be engaged with the first lock ring in the pipe axis direction is provided on the inner circumference of the other end of the connection pipe. A sealing material is arranged on the opening side of the other end of the connection pipe with respect to the projection, and a pressing ring for compressing the sealing material at the opening of the other end is arranged on the outer periphery of the tube body, and In a place away from the connecting pipe That the outer circumference of the tube, is obtained by mounting the second locking ring which can be mutually relates to the tube axis direction with respect to the junk ring.

Further, according to the method of connecting a pipe to a manhole according to the present invention, the connecting pipe is formed in a tapered shape whose diameter gradually decreases from one end to the other end and an annular projection is formed on the inner periphery of the other end. Into the inside of the pipe, the distal end of the pipe body with the second lock ring attached to the outer periphery of the part at a distance from the distal end from the other end side, and in this inserted state, the connection pipe is more connected than the protrusion. A first lock ring, which can be engaged with the projection in the pipe axis direction, is fitted to the outer periphery of the distal end of the tube body on the back side, and is disposed closer to the opening at the other end of the connection pipe than the projection. The compressed sealing material is compressed at a position of the opening at the other end by a pressing ring that is arranged on the outer periphery of the tube and that can engage with the second lock ring in the tube axis direction.
The connecting pipe is held at the tip of the pipe, and concrete forming the wall of the manhole is cast around one end of the connecting pipe.

[0007]

According to the above connection structure, the connection pipe extends from a position where the first lock ring on the outer periphery of the pipe engages with the protrusion of the connection pipe to a position where the second lock ring engages with the pressing ring. The pipe and the pipe body are relatively movable in the pipe axis direction, so that the expansion and contraction performance is imparted to the connecting portion of the pipe to the manhole. In addition, since the connecting pipe is formed in a tapered shape, and the inner surface of the connecting pipe and the outer surface of the pipe support each other only at the sealing material, the two pipes are relatively bent around the sealing material. It is possible, and the bending performance based on it is also given.

[0008] According to the connection method, since the connecting pipe is held by the pipe after providing the expansion and contraction performance and the bending performance between the pipe and the connecting pipe, the wall of the manhole is held in the holding state. The concrete constituting the part is cast around the one end side of the connecting pipe.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 11 denotes a concrete wall constituting a manhole, 12 denotes the inside of the manhole, and 13 denotes the outside of the manhole. The manhole is formed from the surface of the ground toward the underground pipeline. When the pipeline is laid, that is, when the manhole is constructed, the outside 13 is configured to have a space as a pit for construction. Reference numeral 14 denotes a pipe constituting a pipeline, which is laid at the position of a pit constituting the outside 13 as a leading pipe of the pipeline.

A connecting pipe 15 is attached to a portion of the concrete wall 11 corresponding to the pipe 14. The connection pipe 15 has one end 17 embedded in the concrete wall 11 and the other end 18 protruding outside the concrete wall 11 along the pipe axis direction of the pipe 14. Connection pipe
One end 17 of 15 is arranged such that its open end is substantially flush with the inner surface of concrete wall 11. Also this one end 17
A flange portion 19 is formed on the outer periphery of the connecting member 15 so as to protrude toward the inside of the concrete wall 11 to firmly connect the connecting pipe 15 to the concrete wall 11. The connection pipe 15 is formed in a tapered shape whose diameter gradually decreases from one end 17 to the other end 18. On the inner periphery of the other end 18, an annular protrusion 21 having a rectangular cross section is formed, and an inner peripheral taper formed closer to the open end than the protrusion 21 and gradually increases in diameter toward the open end. And a sealing material pressing surface 22 having a shape of a circle. Other end 18
A flange 23 is formed on the outer periphery of the.

The distal end 24 of the tube 14 is inserted into the inside of the connecting tube 15 through an opening at the other end 18 of the connecting tube 15.
A lock ring 26 having a rectangular cross section is fitted in an annular groove 25 formed on the outer periphery of a portion located on the back side of the connection pipe 15 with respect to the protrusion 21 in FIG.

An annular rubber sealing member 27 is provided between the sealing member pressing surface 22 of the connecting tube 14 and the outer peripheral surface of the corresponding tube 14.
Is arranged. A push ring 28 is fitted on the pipe body 14 at a position farther from the connecting pipe 15 than the sealing material 27, and the push ring 28 has a T-head bolt 29 and a nut which are passed through a hole of the flange 23. By being fastened by 30, the sealing material 27 can be compressed between the sealing material pressing surface 22 and the outer peripheral surface of the tube 14.

A lock ring 33 having a rectangular cross section is fitted in an annular groove 32 formed on the outer periphery of the tube body 14 at a position farther from the connecting tube 15 than the pressing ring 28. The distance from the lock ring 26 to the lock ring 33 in the tube 14 is
The length is set in accordance with the expansion / contraction performance required between the pipe body 14 and the connection pipe 15, that is, the length of the expansion / contraction margin. The degree of taper of the connection pipe 15 is set according to required bending performance, that is, the maximum allowable bending angle.

When constructing such a connecting portion, a pit is first formed from the surface of the ground at a place where a manhole is to be installed, and a pipeline is laid underground toward the pit.
Then, the other end 18 of the connection pipe 15 arranged in the pit is put on the front end 24 of the pipe 14 so that the front end 24 is connected to the connection pipe 15.
Insert inside. That is, the annular groove 25 is located on the back side of the connection pipe 15 with respect to the protrusion 21. In addition, on the outer periphery of the tube 14,
The lock ring 33, the press wheel 28, and the seal member 27 are fitted in advance in advance.

When the distal end 24 of the tube 14 is inserted into the connection tube 15, the lock ring 26 is inserted into the connection tube 15 from one end 17 side, and this is inserted into the annular groove 25 of the tube 14. Fit.
Then, the seal member 27 is inserted between the press-contact surface 22 and the outer peripheral surface of the corresponding tube body 14, and the pressing ring 28 is fastened to the flange 23 by the T-head bolt 29 and the nut 30 to compress the seal member 27.

Thus, the joining of the connecting pipe 15 and the pipe 14 is completed, and the connecting pipe 15 is connected to the pipe 14 via the compressed sealing material 27.
Is held on the outer peripheral side of the front end 24 of the head. Therefore, an appropriate framework is constructed around one end 17 of the connection pipe 15 in the held state, and concrete is poured into that portion to form the concrete wall 11 constituting the wall of the manhole. At this time, since the connecting pipe 15 is held by the pipe body 14 as described above, construction for constructing a framework and placing concrete can be easily performed.

In this way, the connecting pipe 15 is firmly fixed with its one end 17 buried in the concrete wall 11 in a state where the flange portion 19 enters the inside of the concrete wall 11. Thereafter, backfilling of the outer portion 13 completes the laying work of the pipeline in this portion.

In this state, the connecting pipe 15 and the pipe body 14 are moved into the limit entry position where the lock ring 33 engages with the pressing ring 28 as shown in FIG. 2 and the lock ring as shown in FIG.
26 is relatively freely movable in the tube axis direction in a range between the limit exit position associated with the protrusion 21. For this reason,
At the joint between the two pipes, the expansion and contraction performance in that range is provided.

The connecting pipe 15 is formed in a tapered shape whose diameter gradually decreases from one end 17 to the other end 18.
In addition, since the inner surface of the connecting pipe 15 and the outer surface of the pipe body 14 support each other only at the sealing material 27, the two pipes 14, 15 are centered on this sealing material 27 as shown by phantom lines in FIG. Are relatively bendable. For this reason, the bending performance based thereon is provided.

By providing the expansion and contraction performance and the bending performance in this way, it is possible to favorably follow an earthquake or land subsidence, and an excessive force is applied to the connection portion between the two pipes. Is prevented.

[0021]

As described above, according to the connection structure of the present invention, the second lock ring engages with the pressing ring from the position where the first lock ring on the outer periphery of the tube engages with the projection of the connection pipe. Since the connecting pipe and the pipe body can be relatively moved in the pipe axis direction within the range up to the position, not only can the expansion and contraction performance thereby be provided, but also both pipes relatively bend around the sealing material. Since it is possible, the bending performance can be imparted thereby, so that when an earthquake or land subsidence occurs, it can be followed well, and it is possible to prevent an unreasonable force from being applied to the connection portion between the two pipes.

Further, according to the connection method of the present invention, after imparting expansion and contraction performance and bending performance between the pipe and the connection pipe,
The connecting pipe can be held by the pipe body, so that the work of placing concrete around the connecting pipe can be easily performed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a structure for connecting a pipe to a manhole according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a state in which a pipe enters a limit.

FIG. 3 is a cross-sectional view showing a state in which a tube comes out of a limit.

[Explanation of symbols]

 11 Concrete wall 14 Pipe 15 Connecting pipe 17 One end 18 Other end 21 Protrusion 26 Lock ring 27 Seal material 28 Press ring 33 Lock ring

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hirobo Ohama 2-26-2 Ohama-cho, Amagasaki City, Hyogo Prefecture Inside Kubota Mukogawa Works Co., Ltd. (72) Inventor Kenichi Honda 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Japan Telegraph and Telephone Co., Ltd. (72) Inventor Oshi 1-6, Uchisaiwai-cho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Co., Ltd. Field (Int.Cl. ⁷ , DB name) F16L 5/00 E02D 29/12 F16L 21/08

Claims (2)

(57) [Claims] 1. A connecting pipe having one end fixed to a concrete wall forming a manhole, the other end of which protrudes outward from the concrete wall, and the diameter of the connecting pipe gradually decreases from the one end to the other end. The distal end of a pipe that forms a conduit connected to the manhole is inserted into the connection pipe, and a first lock ring is attached to the outer periphery of the distal end of the pipe, and the connection is established. An annular protrusion is formed on the inner periphery of the other end of the pipe so as to be able to engage with the first lock ring in the pipe axis direction, and a sealing material is arranged on the opening side of the other end of the connection pipe beyond this protrusion. At the same time, a pressing ring for compressing the sealing material at the opening at the other end is disposed on the outer periphery of the tube, and the pressing ring is engaged with the outer periphery of the tube at a portion further away from the connecting pipe than the pressing ring in the axial direction of the pressing ring. A second lock ring that can fit The connection structure of the pipe to the manhole characterized by wearing. 2. A connecting pipe having a tapered shape gradually decreasing in diameter from one end to the other end and having an annular projection formed on an inner periphery of the other end, wherein the connecting pipe has
Insert the distal end of the pipe body with the second lock ring attached to the outer periphery of the part at a distance from the distal end, and in this inserted state, the distal end of the pipe part on the deeper side of the connecting pipe than the protrusion A first lock ring that can be engaged with the projection in the pipe axis direction is fitted to the outer periphery of the pipe, and a sealing material arranged on the opening side of the other end of the connection pipe with respect to the projection is attached to the outer periphery of the pipe body. The connection pipe is held at the distal end of the pipe body by being compressed at a position of the opening at the other end by a pressing ring which is arranged at the other end and can be engaged with the second lock ring in the pipe axis direction. A method of connecting a pipe to a manhole, comprising placing concrete forming a wall of the manhole around one end of the pipe.