JP3533463B2 - Reinforcement method of connection part in existing pipe - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is designed to prevent an existing pipe connected to a structure from being damaged by a vibration such as an earthquake, or to prevent water leakage if the connection is made to the structure. The present invention relates to a method of reinforcing a connection portion of an existing pipe for reinforcement.

[0002]

2. Description of the Related Art Conventionally, for example, a structure such as a water collecting tank and an existing pipe such as a drain pipe connected underground
When an earthquake etc. occurs, the vibration causes relative displacement between the existing pipe and the structure, which causes stress in the shear direction and axial direction due to the relative displacement to concentrate on the connection part of the existing pipe with the structure. Will be done. Pipes such as drainage pipes and structures such as water collection tanks are often made of concrete material. Therefore, when the stress generated at the above-mentioned connection portion due to an earthquake or the like becomes large, there is a risk of damage and water leakage. In order to prevent this, for example, when a new pipe is newly installed, the connecting portion is made of a flexible pipe so as to eliminate damage to the connecting portion due to shearing force.

[0003]

However, no suitable construction method has been established for the existing pipe to prevent damage to the connecting portion. For example, it is conceivable to remove the connection part of the existing pipe and connect it instead of the flexible pipe used in the new pipe as described above, but in order to perform this work, the ground is excavated and the existing pipe is installed. It is necessary to expose the connecting portion of the pipe, which is inconvenient because it takes a lot of time and labor.

In view of the above circumstances, therefore, the present invention is a simple and short construction that does not require excavation of the ground and that prevents the breakage of the connection part of the existing pipe or prevents water leakage even if it breaks. It is an object of the present invention to provide a method of reinforcing a connection portion of an existing pipe that can be performed in time.

[0005]

A first aspect of the present invention has a wall portion (2b) arranged in the ground (1), and the wall portion (2b) serves to connect the ground (1) to the ground (1). Laying in the ground (1) in the form of being connected to the structure (2) in which the internal space (2c) is formed in a partitioned form and at the wall (2b) to the structure (2). In the existing pipe (3) provided, when reinforcing the connection portion (5) of the existing pipe (3) with the structure (2), the existing pipe (3) from the internal space (2c) side The ground (1) around the connection part (5) is excavated in the existing pipe laying direction, and the tubular reinforcing member (7) is inserted into the tubular reinforcing member (7) through a space generated by the excavation. The tubular reinforcing member is inserted and installed in the ground (1) in such a manner that the connecting portion (5) of the existing pipe (3) is inserted into the ground. 7), and by installing the buffer material (20) between said connecting portions of the existing pipe (3) (5).

A second aspect of the present invention is the method for reinforcing a connecting portion of an existing pipe according to the first aspect, wherein the tubular reinforcing member (7) is inserted and installed in the ground (1) as described above. It was performed after the ground (1) near the connection portion (5) was improved.

A third aspect of the present invention is the method for reinforcing a connecting portion of an existing pipe according to the first aspect, wherein the cushioning material (20) is made of a material having sealing performance.

The numbers in parentheses are for convenience of showing the corresponding elements in the drawings, and the present description is not limited to the description in the drawings.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side sectional view showing a state where reinforcement work of a pipe connection portion has been completed by a method of reinforcing a connection portion of an existing pipe according to the present invention, and FIG. 2 shows a state before reinforcement work of a pipe connection portion. It is the side sectional view shown.

As shown in FIG. 2, a water collecting tank 2 made of a concrete material (for example, reinforced concrete) is constructed in the ground 1, and the water collecting tank 2 has a plate-shaped bottom portion 2a and side wall portions 2b. is doing. That is, in the water collecting tank 2, the water collecting space 2c is formed so as to be surrounded by the bottom portion 2a and the side wall portion 2b. A drainage pipe 3 is embedded in the ground 1 in a manner extending in the directions of arrows A and B in the drawing, which is a substantially horizontal laying direction, and a drainage pipe 3 has a distribution space 3a in which drainage flows. Has been formed. The drainage pipe 3 is made of concrete material (for example, fume pipe, segment block made of precast concrete, cast-in-place concrete, etc.). This drain pipe 3 is connected to the water collection tank 2. Specifically, the tip portion 3b of the drain pipe 3 (the right portion on the paper surface of FIG. 2) is connected to the side wall portion 2b of the water collecting tank 2, and the distribution space 3a of the drain pipe 3 is connected via the tip portion 3b. And the water collecting space 2c of the water collecting tank 2 communicate with each other. That is, the drainage or the like that has passed through the drainage pipe 3 flows into the water collection tank 2 in the direction of arrow B from the tip portion 3b of the drainage pipe 3.

With respect to the existing drainage pipe 3 which is constructed as described above and is connected to the water collection tank 2, the joint P1 with the water collection tank 2 and the pipe connection portion 5 in the vicinity thereof are damaged due to seismic force or the like. FIG. 1 shows a state in which reinforcement work has been performed so that water will not leak even if it is damaged or damaged. That is,
As shown in FIG. 1, the socket 6 is installed on the pipe connecting portion 5 of the drainage pipe 3. Socket 6 is indicated by arrows A and B in the figure.
It has a sheath pipe 7 which is a cylindrical steel pipe centered on an axial center CT1 parallel to the direction, and the sheath pipe 7 has its end portion closer to the water collection tank 2 (arrow B side in the figure) to collect. It is fitted and fixed to the side wall portion 2b of the water tank 2. The pipe connecting portion 5 of the drainage pipe 3 is inserted into the sheath pipe 7, so that the pipe connecting portion 5 is covered with the sheath pipe 7. Further, in the sheath pipe 7, a predetermined clearance CL is formed between the sheath pipe 7 and the drain pipe 3 so as to surround the outer periphery of the pipe connecting portion 5 of the drain pipe 3, and the clearance CL is made of an elastic material (for example, rubber). A low elasticity member such as
The material is not limited to the elastic material as long as the material exerts the stress buffering performance between the sheath pipe 7 and the pipe connecting portion 5. 2)
0 is filled (it is preferable that the cushioning material 20 is a material that also has a sealing performance).

The procedure of the reinforcing work for realizing the reinforcing structure in the pipe connecting portion 5 constructed as above will be described. First, in the vicinity of the side wall portion 2b of the water collection tank 2, the drain pipe 3
An appropriate ground improvement material is injected into the ground 1 in the vicinity of the pipe connection portion 5 to make the improved ground 50 (shown by the chain double-dashed line in FIG. 1) (otherwise, a freezing method or the like may be adopted. ). Then, the circulation of the drainage and the like in the drainage pipe 3 is temporarily stopped (it is preferable to use the rest period of the treatment facility, etc.), and an appropriate cutting means is provided from the inside of the water collection tank 2 around the drainage pipe 3 in the side wall portion 2b. Cut through with a diamond bit etc.
Further subsequently, the ground 1 around the pipe connecting portion 5 of the drainage pipe 3 is excavated in the direction of arrow A, which is the existing pipe laying direction. By this cutting and excavation, the socket insertion hole 10 was formed in the side wall portion 2b in the form of a ring around the drainage pipe 3, and a space was also formed in the ground 1. Then, the sheath pipe 7 is inserted into the socket insertion hole 10 from the inside of the water collection tank 2, and further, through the space formed by the above-described excavation, into the improved ground 50 with improved ground, in the direction of arrow A. To insert. Since the sheath pipe 7 is inserted into the improved ground 50, the ground is stable during construction, which is convenient. After inserting the sheath tube 7, the sheath tube 7 and the side wall portion 2b are fixed in the socket insertion hole 10 or the like. Then, the earth and sand between the sheath pipe 7 and the drain pipe 3 are removed from the inside of the water collection tank 2, and the clearance CL between the sheath pipe 7 and the drain pipe 3 is provided with the socket 6 and the drain 6 as shown in FIG. The clearance CL between the pipe 3 and the buffer material 20 is filled from the water collecting tank 2 side and installed.

As described above, the installation of the socket 6 is completed,
The circulation of drainage in the drainage pipe 3 is restarted to connect the pipe connection part 5
Reinforcement work is completed. When an earthquake or the like occurs in the state where the reinforcement work of the pipe connection part 5 is completed in this way, the vibration causes relative displacement between the drain pipe 3 and the water collection tank 2, whereby the pipe connection part 5 of the drain pipe 3 is generated. Will be subjected to shearing and axial stresses due to relative displacement. However, this stress acts on the pipe connecting portion 5 from the socket 6 which is displaced relative to the drainage pipe 3 together with the water collecting tank 2, and moreover, the entire range where the pipe connecting portion 5 is covered by the socket 6. It acts through the cushioning material 20 (that is, the entire length of the socket 6). Therefore, the stress due to the relative displacement is dispersed and is not concentrated on the joint P1 or the like, so that the drainage pipe 3 is prevented from being damaged and leaking water as much as possible.
Further, even if the joint P1 or the like is damaged, the socket 6 is replaced with a pipe to prevent water leakage as much as possible and the drain pipe 3
The function of can be maintained. Further, in the present embodiment, it is possible to perform the construction easily and in a short time without the need for excavation of the ground 1.

As mentioned in the parentheses in the description of the above-mentioned embodiment, if the cushioning material 20 is a material that also has a sealing property, the care should be taken carelessly in the pipe connecting portion 5 of the drainage pipe 3. Even if the pipe connecting portion 5 is damaged by a large shearing force, the cushioning material 20 filled around the pipe connecting portion 5 reliably seals the periphery of the pipe connecting portion 5. Therefore, the drainage in the drainage pipe 3 does not leak to the outside, which is convenient. Further, in the above-mentioned embodiment,
Although the sheath pipe 7 is a steel pipe, other than the steel pipe, for example, a concrete pipe or the like can be adopted.

[0015]

As described above, the first aspect of the present invention has a wall portion such as a side wall portion 2b arranged in the ground such as the ground 1 and is partitioned from the ground by the wall portion. And a structure such as a water collecting tank 2 in which an internal space such as a water collecting space 2c is formed, and a drainage pipe 3 and the like laid in the ground so as to be connected to the structure at the wall portion In the existing pipe, when the connection portion of the existing pipe such as the pipe connection portion 5 with the structure is reinforced, the ground around the connection portion of the existing pipe from the internal space side is replaced with the existing pipe. The sheath pipe 7 is excavated in the laying direction, and the space is created by the excavation.
A tubular reinforcing member such as is inserted and installed in the ground in such a manner that the connecting portion of the existing pipe is inserted into the tubular reinforcing member,
Since a cushioning material such as a cushioning material 20 is installed between the tubular reinforcing member and the connecting portion of the existing pipe, when the reinforcing work is performed by the method of reinforcing the connecting portion of the existing pipe according to the present invention. However, even if an earthquake occurs, the vibration causes relative displacement between the existing pipe and the structure, and even if shearing or axial stress is applied to the connection part of the existing pipe due to relative displacement, this stress Means that the tubular reinforcing member, which is displaced relative to the existing pipe together with the structure, acts on the connecting portion, and the cushioning material is applied over the entire range where the connecting portion is covered by the tubular reinforcing member. Will work through. Therefore, the stress due to the relative displacement is dispersed and is not concentrated on the joint P1 or the like, so that it is possible to prevent the existing pipe from being damaged and leaking water. Further, even if the joint P1 or the like is damaged, the tubular reinforcing member takes the form of replacing the pipe, preventing water leakage as much as possible, and maintaining the function of the existing pipe. Further, as a particularly great effect of the present invention, since the ground does not need to be excavated, the construction can be performed easily and in a short time.

A second aspect of the present invention is the method for reinforcing a connecting portion of an existing pipe according to the first aspect of the invention, wherein the tubular reinforcing member is inserted and installed in the ground, in the vicinity of the connecting portion. Since the ground is improved after the ground is improved, in addition to the effect of the first invention, the ground around the connection part of the existing pipe is stable during and after the excavation, so that the construction can be performed safely and smoothly. You can do it.

A third aspect of the present invention is the method for reinforcing a connecting portion of an existing pipe according to the first aspect, wherein the cushioning material is made of a material having a sealing performance. In addition to the effect, even in the unlikely event that a large stress acts on the connection part and the connection part is damaged, the buffer material seals the periphery of the connection part, so the fluid inside the existing pipe Is convenient because it does not leak to the outside.

[Brief description of drawings]

FIG. 1 is a side sectional view showing a state in which reinforcement work for a pipe connection portion has been completed by a method for reinforcing a connection portion in an existing pipe according to the present invention.

FIG. 2 is a side cross-sectional view showing a state before performing a reinforcing work on a pipe connecting portion.

[Explanation of symbols]

1 ... Ground 2 ... Structure (water collection tank) 2b ... Wall (side wall) 2c ... Internal space (water collection space) 3 …… Existing pipe (drain pipe) 5: Connection part (pipe connection part) 7: Tubular reinforcing member (sheath tube) 20 ... cushioning material

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-168918 (JP, A) JP-A-10-60992 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) E02F 29/12

Claims (3)

(57) [Claims] 1. A structure having a wall portion arranged in the ground, wherein an internal space is formed so as to be partitioned from the ground by the wall portion, and the structure is connected to the structure at the wall portion. In the existing pipe laid in the ground in the form of, in reinforcing the connection part of the existing pipe with the structure, the ground around the connection part of the existing pipe from the internal space side. While excavating in the existing pipe laying direction, through the space generated by the excavation, the tubular reinforcing member is inserted and installed in the ground in a form of inserting the connection portion of the existing pipe into the tubular reinforcing member, A method of reinforcing a connecting portion in an existing pipe, comprising a cushioning material provided between the tubular reinforcing member and the connecting portion of the existing pipe. 2. The existing pipe according to claim 1, wherein the tubular reinforcing member is inserted and installed in the ground after the ground near the connection portion is improved. How to reinforce the connection. 3. The method for reinforcing a connecting portion in an existing pipe according to claim 1, wherein the cushioning material is made of a material having a sealing performance.