JPS5834720B2 - Method for preventing water leakage at joints of buried branch pipes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing water leakage at a connecting joint of a buried branch pipe branched from a buried main pipe.

For sewage pipes such as humid pipes that are buried underground, if the backing at the joint is improperly inserted or the backing is damaged during use, groundwater may seep into the pipe from the joint and mix with the sewage, resulting in sewage. The amount of processing is increasing.

In addition, when there are many leaks from the joints of sewage pipes for factory waste liquid, the sewage and waste liquid leak into the ground, and the untreated sewage mixes into rivers and irrigation ditches, causing groundwater and
It may contaminate river water, irrigation water, etc. and cause pollution problems.

In order to prevent water leakage at the joints of sewer pipes,
A television camera for sewage pipe inspection and a ceiling bunker are placed inside the sewage pipe and moved together.The television camera discovers the leakage point in the sewage pipe, and the curing agent liquid is pressurized into the leakage point from the sealing packer to harden it. method is known.

The above-mentioned known method is applied to prevent water leakage from sewer pipe joints connected in series.

In addition, the inventor previously installed a main pipe sealer made of a hollow elastic body in the main sewer pipe and a hollow elastic body in the branch pipe in order to prevent water leakage at the branch joint between the main sewer pipe and the branch pipe. A branch pipe sealer consisting of: is placed respectively, compressed gas is sent into both sealers to seal the rain sewer pipe, and curing agent liquid is injected into the branch joint from one of the sealers and solidified. We have invented a method for preventing water leakage at branch joints of sewer pipes (see Japanese Patent Laid-Open No. 52-87854).

As mentioned above, methods for preventing water leakage at joints of main sewer pipes and branch joints between main sewer pipes and branch pipes have been known;
Afterwards, while the present inventor carried out many on-site works to prevent water leakage from sewer pipes, he learned that water leaks also occurred at the connection joints of sewer branch pipes.

In other words, when a sewage branch pipe is long, especially when it is curved, it is formed by connecting multiple short pipes, and the sewage branch pipe is buried close to the ground surface. Because of this, they learned that vibrations from the ground created gaps in the connecting joints of the short pipes, causing significant water leakage.

This invention is a step forward in the known method for preventing water leakage at branch joints of sewer pipes, and in addition to water leakage at the branch joints, it also prevents water leakage from the connection joints of short pipes forming sewer branch pipes. It also provides a method to prevent this.

In other words, the present invention provides a method for forming a space between a central part in the longitudinal direction and a branch joint part in a buried branch pipe which branches from a buried main pipe and connects a plurality of short pipes. A main pipe sealer made of a stretchable hollow elastic body is disposed, and a branch pipe sealer made of a stretchable hollow elastic body is provided with a large number of grooves extending from the tip to the middle of the rear part of the buried branch pipe on the outer peripheral surface. , compressed gas is introduced into both of the sealers to seal both buried pipes, and then a hardening agent liquid is injected into the cavity from either of the sealers, and the hardening agent liquid is poured into the above-mentioned number of places. This is a method for preventing water leakage of a connecting joint of a buried branch pipe, which is characterized by penetrating the connecting joint of a short pipe forming a buried branch pipe through a strip groove and hardening the water.

An example of a water leakage prevention device for carrying out the present invention will be described below with reference to the drawings.

1 is a sewer main pipe buried underground (buried main pipe); 2 is a sewer branch pipe (buried branch pipe) branched upward from the sewer main pipe 1; the sewer branch pipe 2 is composed of a plurality of curved short pipes 2a; , 2b, 2
c are sequentially connected to form a curved shape, and the upper end thereof opens into a chamber 4 that serves as a reservoir for sewage collected from sewage branch pipes 3 (usually a plurality of pipes).

The leakage prevention device consists of a main pipe sealer 5 inserted into the main sewage pipe 1 and a branch pipe sealer 12 inserted into the sewage branch pipe 2.

The main pipe sealer 5 includes two main pipe mantles 6a and 6b formed into cylindrical shapes from a stretchable elastic body such as rubber, and a joint made of a rigid material that connects the inner ends of the main pipe mantles 5a and 5b. It is formed from a pipe 7 and end plates 8a and 8b attached to close the outer ends of the main pipe mantles 5a and 6b.

The main pipe mantles 6a and 6b have an outer diameter such that when the inside is expanded by applying pressure, the outer surface thereof comes into close contact with the inner wall 1a of the main sewage pipe 1, and the joint pipe 7 has an inner diameter of the main sewage pipe 1. It has a smaller outer diameter.

The end plate 8b of the main pipe mantle 6b on the rear side has a main pipe mantle 6b.
A compressed gas pipe 9 opening inward is connected to the end plate 8.
A hardening agent pipe 10 and an quick setting agent pipe 11 that airtightly penetrate b.
are provided, and these tubes io and 1i are connected to a hardening agent port 10a and an quick-setting agent port 11a, respectively, which open on the outer surface of the joint tube 7.

The branch pipe sealer 12 includes a tubular branch pipe jacket 13 formed from a stretchable elastic material such as rubber, a warhead-shaped end plate 14a attached to the distal end of the branch pipe jacket 13, and a warhead-shaped end plate 14a attached to the rear end. It is formed from the attached end plate 14b.

The branch pipe jacket 13 has an outer diameter such that its outer surface comes into close contact with the inner wall 2d of the sewer branch pipe 2 when it is expanded by applying pressure to the inside thereof, and has approximately the same length as the sewer branch pipe 2. have.

A warhead-shaped end plate 14a is provided on the outer peripheral surface of the branch pipe mantle 13.
A multi-striped groove 13a (Fig. 2) is formed from the side tip to the middle of the connecting joint part B between the short pipes 2b and 2c of the sewage branch pipe 2. When inflated, it communicates with the inside of the main sewer pipe 1 without being blocked.

A compressed gas pipe 15 opening into the branch pipe jacket 13 is connected to the end plate 14b at the rear end.

The compressed gas pipes 9 and 15 are connected to a compressor or a cylinder (not shown) installed on the ground, and the hardening agent pipe 10 and quick-setting agent pipe 11 are connected to a storage tank (not shown) installed on the ground. They are connected by flexible rubber tubes.

Short pipe 2 a + 2 of sewer branch pipe 2 using the above device
In order to prevent water leakage at the connection joint of b + 2c, put the main pipe sealer 5 into the main sewer pipe 1 and arrange it so that the joint pipe 7 is located at the branch joint A of the main sewer pipe 1.
The branch pipe sealer 12 is inserted into the sewer branch pipe 2 and placed in such a position that its warhead-shaped end plate 14a is close to the branch joint part A.

Next, pressure 1 to 3 is applied in the main pipe sealer 5 and branch pipe sealer 12.
When compressed gas of Kp/crIt is injected, the outer peripheral surfaces of the main pipe mantles 6a and 6b, which have shrunk into irregular shapes, come into close contact with the inner wall 1a of the main sewage pipe 1, and the joint pipe T and the inner wall 1a are brought into close contact with each other.
An annular space 16 is formed between the sewage branch pipe 2 and the outer circumferential surface of the branch pipe sheath 13 is in close contact with the inner wall 2d of the sewage branch pipe 2.

Next, the curing agent pipe 10 and quick setting agent pipe 11 of the main pipe sealer 5
The curing agent and quick-setting agent are added under a pressure of 0.1 to 0.8 Ky/
When the curing agent is pumped at cr/l, the mixed curing agent liquid is forced out from the curing agent port 10a and the quick-setting agent port 11a, and the annular space 16 is filled with the mixed curing agent liquid, which passes through the groove 13a of the branch pipe jacket 13 and drains into the sewage. Short pipe 2a12b of branch pipe 2.

It invades the gap between the water leakage points of the connecting joints B and B of 2c.

Then, the hardening agent liquid that entered into these gaps connects joint B.
It is squeezed out through the outer wall of the pipe, penetrates into the ground, hardens in that state, and closes the outside of the connecting joint part B, thereby preventing groundwater from penetrating into the sewer branch pipe 2 from the connecting joint part B. .

In the above operation, the groove 13a of the branch pipe mantle 13 is not cut to the end plate 14b of the branch pipe mantle 13 on the side of the chamber 4, so that the curing agent liquid does not flow out into the hall 4.

In addition, if there is a water leak in the branch joint A between the main sewer pipe 1 and the branch pipe 2, a part of the hardening agent liquid filled in the space 16 will enter the gap at the leak point in the branch joint A. As a result, water leakage from the connecting joint part B of the sewer branch pipe 2 is prevented, and at the same time, water leakage from the branch joint part A is prevented.

After the above water leakage prevention work is completed, the compressed gas in the main pipe sealer 5 and the branch pipe sealer 12 is released, and the main pipe outer mantle 6
a, 6bs The branch pipe mantle 13 deflates to its original shape and becomes movable within the main sewer pipe 1 and the sewer branch pipe 2, respectively.

In the above construction, the mixed liquid of the curing agent and quick-setting agent supplied to the empty space is applied to the inner wall 1a of the main sewer pipe 1 and the inner wall 2 of the sewer branch pipe 2.
Since it hardens and sticks to the surface of the surface of the surface, it is necessary to remove it with a ronding cleaner after completing the leakage prevention work.

This inventor has previously proposed a water leakage prevention device that prevents hardened material from adhering to the inner wall of a sewer pipe (see JP-A-52-18223 and JP-A-52-87853). The invention can also be applied to the water leakage prevention device proposed above.

Furthermore, in the structure described above, the main pipe sealer 5 is provided with the curing agent pipe 10 and the quick-setting agent pipe 11, but if the inner diameter of the sewage branch pipe 2 is relatively large, the branch pipe sealing A hardening agent tube 10 and an quick-setting agent tube 11 may be provided on the container 12 side, and the hardening agent tube 10 and quick-setting agent tube 11 may be provided in one sealer and the other sealer, respectively.

The compressed gas injected into the main pipe sealer and branch pipe sealer described above may be air, but if a large amount of methane gas is generated in the sewer pipe, it is preferable to use an inert gas such as nitrogen.

A cylinder is preferable as the compressed gas source because the pressure can be easily adjusted, but a compressor may be used for leak prevention work in large sewer pipes.

The curing agent used in this invention can be cured in several minutes, and a two-component type that is mixed with an accelerating agent and a curing accelerator immediately before injection is suitable. Quick setting mortar commonly used in tunnel excavation work, etc.
It is appropriately selected from curable synthetic resins and the like.

Further, the hardening agent may be in the form of a powder that can be hardened by reacting with sewage.

The specific example explained above is related to leakage prevention at the joints of sewer pipes, but this invention is also applicable to leakage prevention at branch joints and connecting joints when installing new water pipes, oil pipes, etc. as well as sewer pipes. It can be widely used for prevention, etc.

As explained above, according to the method of the present invention, it is possible to easily prevent water leakage at the connecting joints of short pipes forming sewer branch pipes, and to prevent water leakage at the branch joints between the main sewer pipe and the sewer branch pipes. Water leakage can also be prevented at the same time.

As a result, groundwater does not mix with sewage, so the capacity of the sewage treatment facility is secured, or sewage is prevented from leaking outside and flowing untreated into river water or groundwater, thereby preventing contamination.

Therefore, this invention makes a significant contribution to solving pollution problems such as sewage treatment and water source pollution.

Further, according to the method of the present invention, the hardening agent liquid is press-fitted into the connecting joint through the groove while the buried branch pipe is sealed by the branch pipe mantle, so that the hardening agent liquid is applied to the entire inner surface of the buried branch pipe. Since the cured product does not adhere to the hardener, it is easy to remove the cured product, and the amount of hardening agent solution may be small.

[Brief explanation of the drawing]

FIG. 1 is a vertically cut side view of an example of an apparatus for carrying out the method of the present invention, and FIG. 2 is a cross-sectional view taken along the line XX in FIG. 1: Sewer main pipe (buried main pipe), 2: Sewer branch pipe (buried branch pipe)
, 2a, 2b, 2c: Short pipe, 5: Main pipe sealer, 5a, 5
b: Main pipe mantle, 7: Joint pipe, 12 branch pipe sealer, 13:
Branch pipe mantle, 13a: groove, 16: void, A: branch joint part,
B: Connection joint part.

Claims (1)

[Claims] 1. In a buried branch pipe that is branched from a buried main pipe and connected to a plurality of short pipes, a telescopic pipe is constructed of a retractable pipe that forms a space between the central part in the longitudinal direction and the branch joint part in the buried main pipe. A main pipe sealer made of a hollow elastic body is disposed, and a branch pipe sealer made of a stretchable hollow elastic body is disposed within the buried branch pipe, and the branch pipe sealer is made of a stretchable hollow elastic body and has a plurality of grooves extending from the tip to the middle of the rear part on the outer peripheral surface. Compressed gas is introduced into both of the sealers to seal both buried pipes, and then a hardening agent liquid is injected into the cavity from either of the sealers, and the hardening agent liquid is applied to the multiple grooves. A method for preventing water leakage at a connecting joint of a buried branch pipe, the method comprising penetrating and hardening water into the joint of a short pipe that forms a buried branch pipe.