JPH03255294A - Sealing method of connecting portion of lining pipe and branch pipe - Google Patents

Abstract

PURPOSE:To efficiently accomplish sealing between a lining and a main pipe by installing a stop cock on a branch pipe, lining a main pipe, providing a through hole in a lining pipe or the like by a drill, bursting an elastic body, hardening a seal material, and boring a lining pipe by a drill. CONSTITUTION:A sealing method comprises a process of installing a stop cock 20 in such a manner as to stop a branch pipe 82 in a water stop portion, a process of lining a main pipe 81 by a lining pipe 10, a process of providing a through hole in the lining pipe 10 and a plate portion 21 by a drill having a knife edge portion 33d, forming a through hole in a seal material 22b, and bursting an elastic body 22a to let the seal material 22b to flow out, a process of filling between the plate portion 21 and the lining pipe 10 with seal material and hardening the seal material, and a process of boring the hardened seal material by the drill 33. Accordingly, the hardened seal can be pierced by the rise of the drill so as to simplify the sealing method.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention provides a method for rehabilitating a buried pipe such as a sewer pipe with a synthetic resin lining pipe, and a branch pipe branched from the buried pipe and a lining pipe. The present invention relates to a method of sealing a communicating portion of a device.

(Conventional technology) Old metal pipes and humid pipes are used as underground pipes for water supply and sewerage systems.

Such buried pipes become obsolete due to long-term use, and there is a risk of damage due to corrosion, cracks, etc., resulting in water leakage. For this reason, recently, a synthetic resin pipe is inserted into an aged buried pipe and the inner circumferential surface of the buried pipe is lined with the synthetic resin pipe.

Usually, a main underground pipe such as a sewer pipe has many branch pipes branching off, and sewage and the like flow into the main pipe from each branch pipe. For this reason, in the method of rehabilitating the main pipe with a synthetic resin lining pipe as described above, the communication area between each branch pipe and the main pipe is It is necessary to stop the water. Further, after inserting the lining pipe into the main pipe, an opening must be formed in the lining pipe in order to communicate the inside of the lining pipe with the inside of the branch pipe. At this time, if an opening is formed in the lining pipe and the inside of the lining pipe and the inside of the branch pipe are communicated,
Since the opening of the lining pipe has a gap from the end face of the branch pipe, the sewage flowing through the branch pipe is
There is a risk that it may flow between the lining pipe and the main pipe through the gap. For this reason, it is necessary to seal between the peripheral edge of the opening in the lining pipe, which is the communication part between the lining and the branch pipe, and the inner circumferential surface of the main pipe, which is the peripheral edge of the branch pipe.

To explain an example of a conventional method for sealing a communication portion between a lining pipe and a branch pipe, first, an opening is formed in a portion of the lining pipe installed in the main pipe that faces the branch pipe, and the lining pipe and the branch pipe are sealed. and communicate with each other. Then, a stopcock is installed between the formed opening and the end of the branch pipe. Next, a small hole is made in the lining pipe near the periphery of the opening where the water stop valve is installed, and a sealing material is inserted between the lining pipe and the main pipe at the periphery of the water stop valve through the small hole. Fill. Then, after the sealing material has hardened, the water stopcock is removed. As a result, the sealing material seals between the periphery of the opening of the lining pipe and the inner peripheral surface of the main pipe, which is the periphery of the end face of the branch pipe, and the communication portion between the lining pipe and the branch pipe is sealed.

(Problem to be solved by the invention) In such a water stop method, it is necessary to open an opening in the lining pipe in order to attach the water stop valve, but the opening must be opened in a perfect circle shape. Moreover, the periphery of the opened opening may not be smooth and may become uneven. For this reason, even if a water stop valve is attached to the opening, water cannot be completely shut off from the opening. If the opening is deviated from the end surface of the branch pipe, the stopcock cannot be installed across both the opening and the branch pipe. In addition, a small hole for filling the sealing material must be opened separately from the opening, and
Since the small hole must be sealed with a sealing material to be filled, there is a problem in that workability is poor. Furthermore, since the sealing material is filled through the small hole near the periphery of the opening, the sealing material may not completely wrap around the periphery of the stopcock, which may impair sealing performance. In particular, when the lining pipe is in close contact with the inner circumferential surface of the main pipe, it is difficult to completely fill the entire periphery of the stopcock with the sealing material. If the filling amount of the sealing material is increased in order to completely fill the entire periphery of the stopcock with the sealing material, economic efficiency will be impaired.

The present invention solves the above conventional problems, and its purpose is to reliably and efficiently connect the outer circumferential surface of the lining pipe and the inner circumferential surface of the main pipe at the communication portion between the lining pipe and the branch pipe.
The purpose is to provide a method of sealing.

(Means for Solving the Problems) A water stoppage method in a communication portion between a lining pipe and a branch pipe according to the present invention includes a plate portion that covers an end opening communicating with the main pipe of a branch pipe branched from a main pipe; a step of attaching a water stop valve that is attached to the plate part and has a water stop part whose hollow elastic body is filled with a sealing material so that the water stop part stops water from the end of the branch pipe; , a process of lining the main pipe with a lining pipe, and a body part capable of drilling a hole having a larger diameter than the cutting edge part, a neck part having a rotation range of a smaller diameter than the cutting edge part, and a neck part having a diameter slightly larger than the cutting edge part. A step of forming a through hole in the lining pipe and the plate part using a drill connected through a connecting part having a rotation range, and rupturing the elastic body in order to drain the sealing material of the water stop part, and the plate part. Position the neck of the drill in the through hole formed in the plate part so that the sealing material is filled between the pipe and the lining pipe, and apply the far casting part of the drill to the through hole formed in the lining pipe. a step of hardening the sealing material while rotating the drill; and a step of drilling the hardened sealing material and the lining pipe so that the inside of the branch pipe and the inside of the lining pipe communicate with each other using the body of the drill. Thus, the above objective is achieved.

(Example) The present invention will be described below with reference to Examples.

As shown in FIG. 1, the method of the present invention is carried out, for example, when a main pipe 81, which is an aged sewer pipe, is rehabilitated with a synthetic resin lining pipe. First, connect the lining pipe to the main pipe 8.
1, the branch pipe 8 that branches from the main pipe 81
A water stop valve 20 is attached to the end of the main pipe 2 communicating with the main pipe 81 .

As shown in FIGS. 2 and 3, for example, the water stop valve 20 includes a plate portion 21 that is a flat plate curved into an arc shape, and a water stop portion 22 attached to the center of the plate portion 21.
It has The plate portion 21 is made of, for example, transparent vinyl chloride and is sized to completely cover the open end of the branch pipe 82 .

A plurality of concave grooves 21b are provided on the arcuate inner circumferential surface of the plate portion 21 along the axial direction of the arc.

The water stop portion 22 attached to the plate portion 21 includes a hollow elastic body 22a such as rubber, and a uniform gel-state sealing material 22b such as urethane filled in the elastic body 22a.
It is composed of. The elastic body 22a is the sealing material 2
It has a spherical shape due to being filled with 2b. The water stop portion 22 is attached to the central portion of the plate portion 21.

Mesh parts 23 and 23, which are rectangular metal meshes curved into an arc shape like the plate part 21, are attached to each side of the arcuately curved plate part 21 in the axial direction.

On the upper surface of each side of the plate portion 21 extending in the axial direction, and on the upper surface of each side of each mesh portion 23 extending in the axial direction, an adhesive portion 24 is formed by impregnating a moisture-absorbing material such as a sponge with an adhesive. , respectively installed. Further, on the lower surface of each side of the plate portion 21 extending in the axial direction, and on the lower surface of each side of each mesh portion 23 extending in the axial direction, a partition portion 2 made of a moisture-absorbing material such as a sponge is provided.
5 (see FIG. 3) are provided respectively.

Note that the adhesive portion 24 is not limited to the moisture-absorbing material impregnated with an adhesive as described above, but may be, for example, a cylindrical package that is destroyed by compressive force and filled with an adhesive. . When such an adhesive part is pressed against the peripheral edge of the end opening of the branch pipe 82, the package is damaged and the adhesive inside leaks, and the plate part 21 is fixed in a predetermined position by the adhesive. Ru.

The water stop valve 20 having such a configuration is constructed by, for example, using a suitable stopper installation device that can run inside the main pipe 81 to install the water stop part 22, which has a spherical shape by filling the elastic body 22a with the sealing material 22b.
is installed in the end of the branch pipe 82 so as to be in close contact. When the plate portion 21 is pressed against the peripheral edge of the end opening of the branch pipe 82, the adhesive impregnated in each adhesive portion 24 adheres to the peripheral edge of the end opening of the branch pipe 82, and the plate portion 21 is fixed. The plate portion 21 is
Because it is large enough to cover the end opening of the branch pipe 82,
The mesh portions 23 provided on each side of the plate portion 21 in the axial direction do not face the opening at the end of the branch pipe 82, but are located on the inner periphery of the main pipe 81, which is the peripheral edge of the opening at the end of the branch pipe 82. It is facing the surface.

When the stopcock 20 is attached to the end of the branch pipe 82, a synthetic resin lining pipe 1o is inserted into the main pipe 81.

The lining pipe is, for example, a spiral pipe manufactured by spirally winding a synthetic resin band, and the spiral pipe is installed in a manhole 83 to which one end of the main pipe 81 is connected. Manufactured using a pipe making machine. Synthetic resin strips are sequentially introduced into the pipe-making machine, and the pipe-making machine winds the introduced strips in a helical pattern to form adjacent side edges of the wound strips. They are locked together by interposing a wire between their side edges to produce a spiral tube with a relatively small diameter compared to the inner diameter of the main tube 81. Ribs each having a T-shaped cross section are formed on a surface of the band-shaped body that would be the outer circumferential surface in the case of a spiral tube, at appropriate intervals in the axial direction. and,
The spiral tube manufactured by the tube making machine is directly inserted into the main pipe 81.

When the small-diameter helical tube with the wire attached is inserted into the main pipe 81, the tube-making machine installed in the manhole 83 is driven to sequentially feed the strips to the helical tube.
The anti-slip wire attached to the helical tube is sequentially removed from the tip of the helical tube. As a result, the spiral tube becomes
When the wire rod is detached, the adjacent side edges of the strips forming the helical tube slide due to the propulsive force applied to the strips by the pipe making machine, and the helical tube is separated from the wire rod. The diameter is expanded sequentially from the part where it is detached. As a result, the spiral tube becomes a lining tube 10' in which the ribs having a T-shaped cross section are in close contact with the inner circumferential surface of the main tube 81, as shown in FIG. In such a state, the water stop valve 20 attached to the branch pipe 82 is connected to the plate portion 21 and the mesh portion 23.
Partition part 2 such as a sponge attached to the lower surface of each side of
5 is fitted between the ribs on the outer circumferential surface of the lining pipe IO, and the mutually adjacent ribs are partitioned by each partition portion 25.

When the main pipe 81 is thus lined with the lining pipe 10 that is in close contact with the inner circumferential surface of the main pipe 81, the perforator 30 is introduced into the lining pipe 10, as shown in FIG. In the drilling machine 30, for example, a vertical drill 33 rotated by a motor is attached to the tip of a main body 31 so as to be movable up and down.

As shown in FIG. 6, the drill 33 attached to the drilling machine 30 has its base end body 33a attached to the main body 31 of the drilling machine 30, and is rotated. The outer diameter of this body portion 33a is slightly smaller than the inner diameter of the branch pipe 82. A neck portion 33c is provided on the distal end side of the body portion 33a via a continuous portion 33b having a smaller diameter than the body portion 33a, and a cutting edge portion 33d is further provided on the distal end side of the neck portion 33c. It is being The tip of the cutting edge portion 33d is sharpened, and the outer diameter of the cutting edge portion 33d is the same as that of the plate portion 21.
It has an outer diameter sufficiently smaller than the inner diameter of the opening 21a. The neck portion 33c connected to the blade tip portion 33d has an outer diameter smaller than the blade tip portion 33d, and the connecting portion 33b provided on the base end side of the neck portion 33c has an outer diameter slightly larger than the outer diameter of the blade tip portion 33d. It has a diameter.

The length of the neck portion 33c is greater than the thickness of the plate portion 21 of the stopcock 20.

A drilling machine 3 equipped with a drill 33 having such a configuration
0 is equipped with a television camera for surveillance.
The drilling machine 30 is operated on the ground surface based on the situation inside the main pipe 81 photographed by this television camera. When the drill 33 of the drilling machine 30 is opposed to the center of the stopcock 20 attached to the branch pipe 82, the drilling machine 30 is stopped. Then, the plate portion 2 in the water stop valve 20
When the cutting edge portion 33d of the drill 33 is opposed to the approximate center of the work, the drill 33 is rotated and raised. As a result, the cutting edge portion 33d of the drill 33
After forming a through hole in the lining pipe 10, a hole is drilled in the center of the plate portion 21 of the stopcock 20, and the hole passes through the center of the plate portion 21.

When the tip of the cutting edge portion 33d of the drill 33 comes into contact with the water stop portion 20, the elastic body 22a of the water supply portion 20 ruptures, and the gel-state sealing material 22b filled inside the elastic body 22a is released into the plate portion 2.
1. Even after rupturing the elastic body 22a, the drill 33 is further rotated and raised, and the drill part 33
The neck portion 33c is located in the through hole formed in the plate portion 21, and the connecting portion 33b provided on the base end side of the neck portion 33c abuts the through hole formed in the lining pipe 10. be done.

Since the neck portion 33c has a smaller diameter than the through hole formed in the plate portion 21, there is a gap between the neck portion 33c and the through hole. In addition, the neck portion 33c is longer than the thickness of the plate portion 21, so the through hole of the plate portion 21 is
The upper and lower parts of the plate part 21 are kept in communication without being completely blocked by the neck part 33c. Further, since the through hole formed in the lining pipe 1O is in contact with the continuous portion 33b of the drill 33, the through hole is closed by the continuous portion 33c. Therefore, the sealing material 22b spilled onto the plate portion 21 due to the rupture of the elastic body 22a.
The neck portion 33c of the rotating drill 33 and the plate portion 2
1, and flows between the plate portion 21 and the lining pipe IO. The sealing material that has flowed between the plate part 21 and the lining pipe 10 flows between the ribs and moves in the circumferential direction, filling up between each partition part 25 of the water stop valve 20 and filling each rib. cross over and move sequentially in the axial direction. When the sealing material 22b reaches the mesh portions 23 on each side of the plate portion 21, the sealing material 22b passes through the mesh portions 23, thereby opening the end of the branch pipe 82 on the inner peripheral surface of the main pipe 81. and the outer peripheral surface of the lining pipe IO. Then, by curing the sealing material 22b, the sealing material 22b is applied to the inner peripheral surface of the main pipe 81, which is the peripheral part of the end opening of the branch pipe 82 on the inner peripheral surface of the main pipe 81, and the inner peripheral surface of the lining pipe io.
The outer peripheral surface of the branch pipe 82 is reliably sealed with the end opening of the branch pipe 82 covered.

When the sealing material 22b is hardened, the drill 33 is further raised while being rotated. As a result, the body portion 33a provided on the proximal end side of the connecting portion 33b of the drill 33 comes into contact with the lining pipe 10 and pierces the lining pipe 10, as well as the hardened sealing material 22b.
Furthermore, the plate portion 21 of the water stop valve 2o is perforated. When the body part 33a enters the branch pipe 82, the lining pipe 10, the sealing material 22b, and the plate part 21 of the stopcock 20 are perforated to form a through hole, and the inside of the lining pipe lo, The branch pipe 82 is placed in communication with the branch pipe 82. Since the body portion 33a has an outer diameter that is approximately the same as the inner diameter of the branch pipe 82, the lining pipe 10 and the sealing material 22
b1 and each through hole formed in the plate part 21,
The inner diameter is approximately the same as the inner diameter of the branch pipe 82.

As a result, the main pipe 81 is lined with a synthetic resin lining pipe, and the lining pipe 1o and the branch pipe 82
are communicated with each other while being sealed with a sealing material.

(Effects of the Invention) In this way, the method of the present invention attaches a water stop valve having a water stop portion in which a sealing material is filled in a hollow elastic body to a branch pipe, and after lining the inside of the main pipe, By simply rotating and lifting a drill having the shape of , the lining pipe and the branch pipe communicate with each other while being surrounded by a hardened sealant. Therefore, the process of filling the sealing material, forming the through hole in the lining pipe, forming the through hole in the hardened sealing material, etc. is performed by raising the drill, and the communication part between the lining pipe and the branch pipe is The sealing method is significantly simplified.

Figures 1, 4 and 5 are cross-sectional views of the connection between a main pipe and a branch pipe, respectively, showing an example of the implementation process of the method of the present invention;
Fig. 2 is a plan view of the stopcock, Fig. 3 is a front view thereof, Fig. 6 is a front view of the tip of the drill, and Figs. 7 to 9 are for explaining the implementation steps of the method of the present invention. FIG. 2 is a cross-sectional view of a connecting portion between a main pipe and a branch pipe.

10... Lining pipe, 20... Water stop valve, 21...
- Plate part, 22...Water stop part, 22a...Elastic body, 22b...Sealing material, 23...Mesh part, 24
...Adhesive part, 25...Partition part, 3°...Drilling machine, 33...Drill, 33a...Body part, 33b...
Continuous part, 33c...Neck part, 33d...Blade tip part, 81
...Main pipe, 82...Branch pipe.

that's all

Claims (1)

[Claims] 1. A plate part that covers an end opening communicating with the main pipe of a branch pipe branched from the main pipe, and a hollow elastic body that is attached to the plate part and is filled with a sealing material. a step of installing a water stop valve having a water stop part with a diameter larger than the cutting edge part so that the water stop part stops water at the end of the branch pipe; lining the main pipe with a lining pipe; The lining pipe is drilled by a drill in which a body part that can drill a hole in the lining pipe is connected via a neck part having a rotation range of a smaller diameter than the cutting edge part and a connecting part having a rotation range of a slightly larger diameter than the cutting edge part. and a step of forming a through hole in the plate portion and bursting the elastic body to allow the sealing material of the water stop portion to flow out; Positioning the neck of the drill in the formed through hole, and bringing the connecting part of the drill into contact with the through hole formed in the lining pipe,
A lining pipe comprising: curing the sealing material while rotating a drill; and drilling the hardened sealing material and the lining pipe using the body of the drill so as to communicate the inside of the branch pipe and the inside of the lining pipe. Sealing method at the communication part with the branch pipe.