JPH06159551A - Water stopping method for connection portion between lining pipe for lining existing pipe having branch pipe and branch pipe - Google Patents

Abstract

PURPOSE:To securely stop water in a connecting portion where a lining pipe for lining the inner circumferential surface of a sewer is connected to a branch pipe branched from an existing pipe. CONSTITUTION:The inner circumferential surface of a sever 40, from which a branch pipe 46 is branched, is lined by a spiral pipe 20. An opening 25 is formed in a portion of the spiral pipe 20, exposed to the branch pipe 46. The opening 25 is closed by a sealing tool 80 inserted into the sewer 40 and another sealing tool 46 inserted into the branch pipe 46. A spacer 75 fixed to a sealing tool 70 is located in the opening 25, thus forming a ring-like space in the opening 25. A sealant 90 is radially discharged from the spacer 75 to be filled in the ringlike space.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of stopping water at a connecting portion between a lining pipe and a branch pipe when the existing pipe having the branched pipe is lined with the lining pipe.

[0002]

2. Description of the Related Art Metal pipes and fume pipes have been used for a long time as existing pipes used for water supply and sewerage.
Such existing pipes may deteriorate due to long-term use, and may leak due to cracking or corrosion. Therefore, recently, a lining pipe made of a synthetic resin is inserted into an existing pipe such as an aged buried pipe and the lining pipe is used for lining. In such a lining method, when the branch pipe branches from the existing pipe, the connecting portion between the branch pipe and the existing pipe is blocked by the lining pipe. For this reason, in order to connect the inside of the branch pipe and the inside of the lining pipe, it is necessary to form an opening in the lining pipe so as to allow the two to communicate with each other and to stop the water around the opening.

As a method of stopping the water around the opening formed in the lining pipe, for example, in Japanese Patent Laid-Open No. 63-72985, a lining pipe is inserted into the existing pipe and the existing pipe is cut by the lining pipe. After lining, an opening is formed in the portion of the lining pipe that faces the branch pipe, and further, a resin seal tube is inserted into the branch pipe, and the seal tube is attached to the inner peripheral surface of the branch pipe and the opening of the lining pipe. A method is disclosed in which the peripheral edge portion and the inner peripheral surface of the lining pipe are pressure-bonded or adhered.

In such a method, since the seal tube protrudes inwardly of the lining pipe for lining the existing pipe, there is a risk of obstructing the flow of running water in the existing pipe. In addition, when the angle of attachment of the branch pipe with respect to the existing pipe is large, wrinkles may occur in the seal tube, which may obstruct the flow of running water in the branch pipe.

On the other hand, in Japanese Unexamined Patent Publication No. 3-240519, an expandable sealing plug is inserted from a branch pipe, and a connecting portion between an existing pipe lined with a lining pipe and the branch pipe is disclosed. After the sealing material is filled with the sealing material and covered with the sealing plug, and the sealing agent is solidified, the lining pipe and the sealing agent that block the connection portion communicate with the inside of the lining pipe and the inside of the branch pipe. A method of forming holes is disclosed. Further, also in JP-A-3-194297, after sealing the connection portion between the existing pipe and the branch pipe with a sealing plug, after filling the sealing material in the gap between the existing pipe and the lining pipe, A method of forming an opening in a lining pipe so as to communicate with a branch pipe is disclosed. Further, Japanese Patent Laid-Open No. 3-242261 discloses a water stopping method using a two-liquid mixed type foamable sealant.

[0006]

When an opening is formed in the lining pipe and the lining pipe and the branch pipe are communicated with each other after the sealing agent has been filled in this way, water leakage occurs in the branch pipe. , Water flows into the connection between the existing pipe and the branch pipe,
When the sealing agent is filled, it may be mixed with the sealing agent. For this reason, the sealing performance of the sealant changes, and it becomes impossible to uniformly seal the entire connecting portion. Further, when a two-liquid mixed type expandable sealant is used, the mixing ratio of the two liquids changes, so that the foaming performance, the curing time and the like change greatly, and
The desired sealing performance may not be obtained uniformly.

The present invention solves such a problem, and an object thereof is to prevent the flow of water or the like in the lining pipe for lining the inner peripheral surface of the existing pipe, and to remove the water from the existing pipe. It is an object of the present invention to provide a water stopping method at a connecting portion between a lining pipe and a branch pipe, which can surely stop water at a connecting portion between the branched pipe and the lining pipe.

[0008]

SUMMARY OF THE INVENTION The present invention is a method for stopping water at a connecting portion between a lining pipe and a branch pipe for lining an existing pipe having a branch pipe, the inner peripheral surface of the existing pipe being lined with the lining pipe. The step of forming an opening in the lining pipe to connect the branch pipe and the existing pipe, covering the opening formed in the lining pipe from the inside of the lining pipe, and the opening. The step of covering the entire portion from the inside of the branch pipe, and arranging a spacer in the opening so that a ring-shaped space is formed at the outer peripheral edge of the opening, and a ring-shaped space of the opening from the spacer. Filling the inside with a sealant,
The above object is achieved thereby.

[0009]

In the water stopping method of the present invention, after lining the existing pipe with the lining pipe, an opening is formed at a position of the lining pipe facing the branch pipe, and the opening is covered from the inside of the lining pipe and the outside of the branch pipe. Turn it on. Then, a spacer is arranged in the opening to form a ring-shaped space, and the space is filled with a sealant. The sealing agent with which the space is filled is also filled between the lining pipe and the existing pipe after filling the space.

[0010]

EXAMPLES Examples of the present invention will be described below. The existing pipe lining method of the present invention is, for example, as shown in FIG. 3A, a concrete sewer pipe 40 that is an existing pipe to which a branch pipe 46 is branched and connected, and a strip 10 is spirally formed. It is carried out at the time of rehabilitation by lining the spiral tube 20 manufactured by winding it as a lining tube.

As shown in FIG. 2, a strip-shaped body 10 which is a spiral pipe for lining the sewer pipe 40 has a strip-plate-shaped substrate 12 on which one side surface 12a extends. A fitting ridge 13 is provided so as to project at an appropriate distance. The mating ridge
The substrate 13 is continuously provided along the longitudinal direction of the substrate 12. The mating ridge 13 has a column part slightly longer than the thickness of the board 12.
13a and an insertion portion 13b having a semicircular cross section disposed at the tip of the column portion 13a. The side edge portion of the substrate 12 provided with the fitting protrusion 13 is formed on the substrate when the spiral protrusion is wound.
Overlaid on the other side edge of twelve.

On the other side edge of the board 12, the fitting projection 13 is projected by the thickness of the board 12 so that the board 12 is spirally wound and the fitting projection 13 is superposed. A step-down portion 17 is formed on the side. A delayed-curing urethane adhesive or the like is applied to the vicinity of the fitting protrusion 13 of the substrate 12 fitted in the step-down portion 17. As will be described later, the urethane adhesive cures after the diameter of the spiral tube formed by the strip 10 is expanded.

The stepped-down portion 17 has an insertion portion for the fitting protrusion 13.
Fitting groove 18 having a space with a semicircular cross section into which 13b can fit
Are provided so as to project in the same direction as the fitting protrusion 13. The fitting concave line 18 is continuous along the longitudinal direction of the substrate 12.

A plurality of reinforcing ribs 16 having a T-shaped cross section, which project from the surface of the substrate 12 are arranged at equal intervals between the fitting protrusion 13 and the fitting recess 18 of the substrate 12. Each reinforcing rib 16
Are continuous along the longitudinal direction of the substrate 12, and the reinforcing ribs 16 are formed on the column portion 16a at the tip of the column portion 16a and the column portion 16a formed in a state orthogonal to the substrate 12. In contrast, it has a flange portion 16b provided in an orthogonal state. Each reinforcing rib 16 is formed such that each flange portion 16b is located in the same plane substantially parallel to the substrate 12.

Such a strip 10 is made of polyvinyl chloride,
It is integrally formed of a material such as polyethylene, polypropylene, polycarbonate, polyester, or a resin obtained by reinforcing these resins with glass fiber, for example, by extrusion molding.

In the lining method of the present invention using the strip 10 having the above-mentioned structure, the strip 10 has the fitting projection 13, the reinforcing rib 16, and the fitting recess 18 on the surface side of the substrate 12 which is erected. As shown in Fig. 3 (a), the manhole should be on the outer peripheral side.
It is spirally wound by the pipe making machine 30 installed in 45,
It is a spiral tube 20. The pipe making machine 30 forcibly bends the strip 10 introduced into the pipe making machine 10 by a pipe making roller having a predetermined spiral angle and arranged on the circumferential surface of the cylinder, so that the strip 10 is formed.
Are sequentially wound in a spiral shape. Then, the step drop portion provided on one side edge portion of the substrate 12 which has already been spirally wound.
The other side edge portion of the substrate 12 adjacent to the stepped-down portion 17 of the belt-shaped body 10 newly fed to the pipe manufacturing machine 30 is fitted into the pipe 17,
As shown in, a pair of pressure rollers 31 provided in the pipe manufacturing machine.
By being pressed by 31 and 31, the step-down portion 17
The fitting protrusion 13 is fitted into the fitting recess 18 of the.

At this time, the strip-shaped fixing material 50 is sandwiched between the step-over portion 17 to be overlapped and the side edge portion of the substrate 12 on the side surface 12a side of the fitting projection 13. This fixing material 50
Is pressed against the step-down portion 17 and the side edge portion of the substrate 12 fitted into the step-down portion 17 to prevent the both from sliding.
The fixing member 50 is formed into a strip plate shape with a synthetic resin that is softer than the material of the strip body 10, such as polyvinyl chloride, polyethylene, polypropylene, polycarbonate, polyester, and EVA. In this way
The side edges of the spirally wound band-shaped body 10 are engaged with each other, and the engagement state is firmly maintained by the fixing material 50. Therefore, the manufactured spiral tube 20 is held at a predetermined diameter.

As shown in FIG. 3 (a), the spiral pipe 20 produced by the pipe making machine 30 is held at an outer diameter sufficiently smaller than the inner diameter of the sewer pipe 40, and The sewer pipe 40 is sequentially inserted into the sewer pipe 40. The spiral pipe 20 inserted into the sewer pipe 40 is inserted into the sewer pipe 40 while rotating, but since the gap 41 is formed with the inner peripheral surface of the sewer pipe 40, the spiral pipe 20 smoothly moves. Insert the inside of the sewer pipe 40. And
As shown in FIG. 3B, when the spiral pipe 20 is inserted into the sewer pipe 40 over the entire length of the sewer pipe 40,
The manufacturing of the spiral tube 20 by the 30 is temporarily stopped, and an anchor or the like is driven into the tip of the strip at the tip of the spiral tube 20 to fix the tip of the strip 10.

When the tip of the spiral tube 20 is fixed, the pipe making machine
30 is driven again, the strip 10 is fed to the pipe making machine 30,
The spiral pipe 20 tries to propel in the sewer pipe 40 while rotating again. At this time, the fixing member 50 sandwiched between the stepped-down portion 17 of the spiral tube 20 and the side edge of the substrate 12 fitted in the stepped-down portion 17 is attached to the tip side where the spiral tube 20 is fixed. To be released in sequence. When the fixing material 50 is detached from the spiral tube 20, a fixing material detaching tool (not shown) for indexing the fixing material 50 in the detaching direction of the fixing material 50 is used in the spiral tube 20. The fixing material 50 detached from the spiral tube 20 passes through the inside of the spiral tube 20 and the pipe making machine.
It is wound from 30 by a winding device (not shown) provided outside the manhole 45. By detaching the fixing member 50 in this manner, the strong pressure contact state between the step-down portion 17 and the side edge portion of the board 12 fitted in the step-down portion 17 is released, and the fitting concave line 18 is formed.
The insertion portion 13b of the fitting protrusion 13 inserted into the
It is ready to slide inside. Then, the belt-shaped body 10 is sequentially fed to the spiral tube 20 by the driving of the pipe manufacturing machine 30, so that the propulsive force acts on the belt-shaped body 10 forming the spiral tube 20.
At this time, since the tip end of the spiral pipe 20 is fixed to the sewer pipe 40, the belt-shaped body 10 is not propelled, and the reaction force causes the fitting concave line 18 and the fitting concave line 18 to The insertion portion 13b of the fitting protrusion 13 fitted to the sliding member slides with each other, and the diameter of the spiral tube 20 is sequentially increased from the fixed tip side. The diameter of the spiral pipe 20, which has been expanded, comes into close contact with the inner peripheral surface of the sewer pipe 40, and the close contact with the inner peripheral surface of the sewer pipe lining the sewer pipe 40 over its entire length. After that, both ends of the spiral tube 20 are cut.

When the sewer pipe 40 is lined over the entire length in this manner, as shown in FIG.
The connecting portion of the branch pipe 46 that is branched and connected to 40 is the spiral pipe 20.
Will be blocked by. Next, as shown in FIG. 6, a drill 62, which is connected by a guide wire 61 to a drive device 60 arranged near the above-ground opening of the branch pipe 46, is inserted into the branch pipe 46. Then, the drill 62 attached to the distal end portion of the guide wire 61 is brought into contact with the spiral pipe 20 lining the sewer pipe 40 to rotate the drill 62. As a result, as shown in FIG. 1B, the drill 62 forms an opening 25 in the spiral pipe 20 that closes the connection between the branch pipe 45 and the sewer pipe 40.

When the opening 25 is formed in the spiral tube 20, as shown in FIG.
As shown in (c), a sealing tool 70 that is in close contact with the outer peripheral surface of the spiral tube 20 around the opening 25 and covers the opening 25 is inserted into the branch pipe 46. In addition, a sealing member 80 that is in close contact with the inner peripheral surface of the spiral tube 20 around the opening 25 and covers the opening 25 is inserted into the spiral tube 20.

As shown in FIG. 7, the sealing member 70 inserted into the branch pipe 45 has an expanding member 74 formed of an elastic material such as expandable rubber, and air is injected into the expanding member 74. And an air hose 78 that operates. The expansion member 74 expands into a cylindrical shape by injecting pressurized air through the air hose 78. One end surface of the expansion member 74 when expanded in a cylindrical shape is the opening of the spiral tube 20.
A substantially horizontal inclined surface is provided so as to face 25. A disk-shaped metal spacer 75 is attached to the inclined end surface, and the spacer 75 is fitted into the opening 25 provided in the spiral tube 20 with a gap. It The spacer 75 is hollow inside, and a plurality of through holes 76 communicating with the hollow portion inside are formed in the outer peripheral surface at equal pitches in the circumferential direction.
Inside the spacer 75, the inside of the expansion member 74 is inserted.
The sealant hoses 77 and 77 of the book are communicated with each other, and the sealant such as urethane resin supplied from each sealant hose 77 is radially discharged from each through hole 76.

A rod 79 made of, for example, metal having excellent rigidity is connected to the other end surface of the expansion member 74, so that the expansion member 71 can be inserted into and withdrawn from the branch pipe 46 by the rod 79. ing.

The closure 80 inserted into the spiral tube 20 is also shown in FIG.
As shown in (c), it has a hollow bag-shaped expansion member 81 made of elastic rubber or the like. Air is injected into the expansion member 81 through an air hose 83 to expand the expansion member 81 into a cylindrical shape. A pulling wire 82 is attached to the expansion member 81, and is moved by being pulled by the pulling wire 82 in the spiral tube 20.

By using the sealing members 70 and 80 having such a configuration, the peripheral portion of the opening 25 formed in the spiral tube 20 is sealed. To seal the periphery of the opening 25, first, the sealing tool 80 is inserted into the spiral tube 20 and moved to a position facing the opening 25 of the spiral tube 20. In this state, the expansion member 81 of the sealing member 80 is filled with air through the air hose 83 to expand the expansion member 81. Then, the expansion member 81
The outer peripheral surface of is pressed against the inner peripheral surface of the spiral tube 25 in the peripheral portion of the opening 25.

In such a state, the sealing member 70 is inserted into the branch pipe 46 from the side where the spacer 75 is arranged, and the spacer 75 is positioned inside the opening 25 of the spiral pipe 20. Then, the expansion member 74 is filled with air through the air hose 78 and expanded until the outer peripheral surface of the expansion member 74 is brought into pressure contact with the inner peripheral surface of the branch pipe 46. At this time, the spacer 75 is
The spiral tube 20 is fitted into the opening 25 with a ring-shaped space. Then, as shown in FIG. 1C, the sealant is supplied to the inside of the spacer 75 through each sealant hose 77 of the sealing tool 70, and each through hole 76 of the spacer 75 is supplied.
The sealant is filled into the ring-shaped space between the opening 25 and the spacer 75.

The sealant 90 filled in the gap between the opening 25 and the spacer 75 is filled from the peripheral edge of the opening 25 into the gap between the spiral pipe 20 and the sewer pipe 40 around the opening 25. Aperture
25 When the sealing agent 90 filled in the peripheral portion and the peripheral portion is solidified, the expansion member 74 and
The air inside 81 is discharged, and the expansion members 74 and 81 are contracted. When the expansion members 74 and 81 are contracted, the closures 70 and 80 are pulled out from the branch pipe 46 and the sewer pipe 40, respectively. As a result, as shown in FIG. 1D, the sealing agent 90 filled in the peripheral portion of the opening 25 and the gap between the sewage pipe 40 and the spiral pipe 20 around the opening 25 is solidified, Water around the opening 25 is surely stopped.

A sealant 90 for stopping water around the opening 25
Is the opening 25 and spacer sealed with the closures 70 and 80.
In order to be filled and solidified in the gap with 75, the sealing agent 90
Is not likely to project from the inner peripheral surface of the spiral pipe 20 and the inner peripheral surface of the branch pipe 46, and there is no risk of obstructing the flow of water in the sewer pipe 40 and the branch pipe 46.

[0029]

As described above, according to the water stopping method of the present invention, after the opening for communicating the inside of the lining pipe with the branch pipe is formed in the lining pipe, the space filled with the sealant is formed, Since the sealant is filled, the leaked water in the branch pipe is not stored in the space filled with the sealant,
Therefore, the space is uniformly filled with the sealing agent having a uniform sealing performance. Since there is no possibility that the sealing agent protrudes inside the lining pipe, there is no risk of blocking the flow of the flowing water through the lining pipe.

[Brief description of drawings]

1 (a) to 1 (d) are cross-sectional views showing respective steps of a method of the present invention for stopping water at a connecting portion between a spiral pipe and a branch pipe.

FIG. 2 is a vertical cross-sectional view showing a strip used for forming a spiral pipe used as a lining pipe for lining an existing pipe.

3 (a) and 3 (b) are schematic views showing steps of a sewage pipe lining method, respectively.

FIG. 4 is a schematic view showing a process of manufacturing a spiral tube from a strip.

FIG. 5 is a sectional view of a main part of a spiral tube.

FIG. 6 is a schematic diagram showing a step of forming an opening in a spiral tube in the water stopping method of the present invention.

FIG. 7 is a side view of the sealing device inserted into the branch pipe.

[Explanation of symbols]

 10 Belt 13 Fitting projection 16 Reinforcing rib 18 Fitting recess 20 Spiral pipe 30 Pipe making machine 40 Sewer pipe 50 Fixing material 70 Sealing device 78 Air hose 74 Expansion member 75 Spacer 76 Through hole 77 Sealing agent hose 80 Sealing Stopper 81 Expansion member 90 Sealant

Claims (1)

[Claims] 1. A method of stopping water at a connecting portion between a lining pipe and a branch pipe for lining an existing pipe having a branched branch pipe, comprising a step of lining the inner peripheral surface of the existing pipe with a lining pipe, Forming an opening to connect the branch pipe and the existing pipe, covering the opening formed in the lining pipe from the inside of the lining pipe to the whole, and covering the opening from the inside of the branch pipe to the whole With covering
A step of disposing a spacer in the opening so that a ring-shaped space is formed in the outer peripheral edge of the opening, and a step of filling the sealant from the spacer into the ring-shaped space of the opening, A method of stopping water including.