JP2003127230A - Reinforcement pipe inserting method and fixture therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress twisting of a reinforcement pipe when the reinforcement pipe is inserted into an embedded pipe in the ground to prevent the generation of wrinkles in the reinforcement pipe. SOLUTION: The reinforcement pipe insertion fixture 20 equipped with a pair of guide members opposed to each other so as to provide the interval almost coinciding with the short side direction of the reinforcement pipe 1 is arranged in the vicinity of the reinforcement pipe insertion port of an attaching pipe 8. The pipe 1 is passed through the reinforcement pipe insertion fixture 20, so that both sides in the short side direction of the pipe 1 are respectively guided to insert the pipe 1 into the attaching pipe 8 from the reinforcement pipe insertion port.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an insertion for inserting a rehabilitation pipe into the existing pipe when the inner surface of the existing pipe such as a buried pipe buried in the ground is lined with a resin rehabilitation pipe. The present invention relates to a method and a jig for inserting a rehabilitation pipe used in the insertion method.

[0002]

2. Description of the Related Art Many pipelines for sewage are buried in the ground. This pipe line is generally a main pipe communicating between manholes and a plurality of mounting pipes (branch pipes) connected to the main pipe.
It consists of The mounting pipe is usually provided so as to pass through a basin provided near the surface of the earth and the main pipe, but unlike the main pipe and the manhole, it has a small pipe diameter and is simply configured. For this reason, the inner surface of the mounting pipe often breaks or cracks due to its deterioration. In addition, the connection between the main pipe and the mounting pipe, which were firmly attached at the beginning of construction, may become loose due to the influence of ground movement. If underground water such as rainwater or spring water flows in from the connection point, the amount of water in the main pipe may exceed the allowable amount of water.

As for the mounting pipe which has deteriorated in this way,
Conventionally, the inner surface of the mounting pipe has been lined with a rehabilitation pipe made of resin to reinforce the pipeline. The present applicant has also developed a technique such as Japanese Patent Application No. 2001-118077 as a method for lining a rehabilitating pipe with respect to a mounting pipe, and has filed a patent application prior to the present application.

This type of lining method is at least
It is equipped with a rehabilitation pipe insertion step and a rehabilitation tube diameter expansion step.

As shown in FIG. 2, the rehabilitation pipe 1 is made of a thermoplastic resin such as polyvinyl chloride or high-density polyethylene, and has a fold-shaped portion 1a extending along the axial direction formed on the outer surface thereof to form a radial direction. Has been degenerate. The rehabilitation pipe 1 has a property of recovering the shape into a cylindrical body by being heated and pressurized to a predetermined shape memory temperature (for example, 80 ° C.). The tip portion of the rehabilitation pipe 1 is closed by a drawing plug 4 so as to be narrowed, and a wire 5 is connected to the drawing plug 4.

In the process of inserting the rehabilitating pipe 1, the rehabilitating pipe 1 is unwound into the mounting pipe from a winder installed near the surface of the masu side, not shown, while the wire 5 connected to the withdrawal plug 4 is passed through the main pipe and the manhole. It is done by pulling with a winch.

After the insertion step, in the step of expanding the diameter of the rehabilitation pipe 1, steam is blown into the rehabilitation pipe 1 to heat and expand the rehabilitation pipe 1. By blowing in high temperature and high pressure steam,
The rehabilitation pipe 1 expands due to the pressure of water vapor and comes into close contact with the inner surface of the mounting pipe.

After that, a tip end treatment step of the rehabilitating pipe 1 is carried out if necessary, and a flange-like flange is formed on the tip end of the rehabilitating pipe, so that the connecting point between the main pipe and the mounting pipe is good. A good waterproofness is secured.

[0009]

However, in the process of inserting the rehabilitation pipe as described above, since the wire 5 connected to the retracting plug 4 is simply pulled by the winch, the rehabilitation pipe is inserted during the insertion. There was a high possibility that a twist (twist around the axis) would occur in No. 1. If the rehabilitation pipe 1 is inserted into the mounting pipe with such a twist, there is a possibility that local wrinkles will occur in the rehabilitation pipe 1 during the diameter expansion step, and the rehabilitation pipe 1 itself There is a possibility that sufficient strength cannot be obtained and reinforcement of the mounting pipe cannot be performed sufficiently.
In particular, when the mounting pipe has a bent portion, wrinkles are concentrated on this bent portion, and the rehabilitation pipe 1
There is concern about local deterioration of strength.

Such a situation occurs not only when the mounting pipe is lined, but also when the main pipe is lined.

The present invention has been made in view of the above points, and an object thereof is to suppress twisting of the rehabilitating pipe when the rehabilitating pipe is inserted into an existing pipe, thereby preventing wrinkles in the rehabilitating pipe. It is to prevent the occurrence.

[0012]

Means for Solving the Problems-Outline of the Invention-To achieve the above object, the present invention maintains a constant posture of inserting a rehabilitating pipe into an insertion port of an existing pipe into which the rehabilitating pipe is inserted. Arrange a jig that allows the insertion operation,
The rehabilitation pipe is fed into the existing pipe while passing through this jig.

-Solution Means- As a concrete insertion method, the cross-sectional shape of the rehabilitation pipe for lining the inner surface of the existing pipe is reduced so as to facilitate the insertion into the existing pipe, and the rehabilitation pipe is It is premised on the method for inserting into the existing pipe. With respect to this insertion method, the reduced cross-sectional shape of the rehabilitating pipe is such that the rehabilitating pipe has a short side direction and a long side direction. Further, near the rehabilitating pipe insertion port of the existing pipe, a rehabilitating pipe insertion repair tool having a pair of guide portions facing each other with an interval substantially corresponding to the dimension in the short side direction of the rehabilitating pipe having the reduced cross-sectional shape. Arrange tools. Then, the rehabilitating pipe is passed through the rehabilitating pipe insertion jig so that both sides in the short side direction of the rehabilitating pipe are guided by contacting the guide portions, and the rehabilitating pipe is inserted into the existing pipe from the rehabilitating pipe insertion opening. Go. Further, the jig for inserting the rehabilitation pipe used in this insertion method is also within the scope of the technical idea of the present invention.

Due to these particulars, when the rehabilitating pipe is inserted into the existing pipe, the rehabilitating pipe is first passed through the rehabilitating pipe inserting jig. The guide parts of the jig for inserting the rehabilitating pipe are opposed to each other with a space substantially corresponding to the dimension in the short side direction of the rehabilitating pipe having a reduced cross-sectional shape such as being folded. While both sides in the short side direction are in contact with and guided by the respective guide parts, that is, the rehabilitation pipe is guided while the twist is eliminated by the respective guide parts, the rehabilitation pipe is inserted into the rehabilitation pipe insertion port of the existing pipe. As described above, since the rehabilitation pipe inserted into the existing pipe is not twisted, the occurrence of wrinkles during the diameter expansion step is also suppressed. As a result, the existing pipe can be sufficiently reinforced with the rehabilitation pipe.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the present embodiment, a case will be described in which the present invention is applied to the lining work of a mounting pipe (branch pipe) connected to a buried main pipe. The present invention is not limited to this, and can be applied to the lining work of the buried main.

Further, the rehabilitation pipe 1 used in this embodiment.
As described above, is made of a thermoplastic resin such as polyvinyl chloride or high-density polyethylene, and has a fold-shaped portion 1a extending along the axial direction formed on the outer surface of the thermoplastic resin and is degenerated in the radial direction (FIG. 2). reference). Further, the rehabilitation pipe 1 has a performance of recovering the shape into a cylindrical body by being heated and pressurized to a predetermined shape memory temperature (for example, 80 ° C.). Since the rehabilitation tube 1 is folded into such a shape, the rehabilitation tube 1 has a longitudinal direction of the fold-shaped portion 1a (vertical direction in FIG. 2) which is a relatively long dimension, and the fold-shaped portion 1a
The width direction (the left-right direction in FIG. 2) is the short-side direction having a relatively short dimension. The tip of the rehabilitation pipe 1 is closed by a drawing plug 4 so as to be squeezed, and a wire 5 is connected to the drawing plug 4. The rehabilitation tube insertion process using the wire 5 will be described later.

-Description of Configuration of Rehabilitation Pipe Insertion Jig-Before the description of the lining work by the rehabilitation pipe 1, the configuration of the rehabilitation pipe insertion jig 20 which is a characteristic member of the present embodiment will be described.

FIG. 1A is a front view of the rehabilitating pipe insertion jig 20, and FIG. 1B is a plan view of the rehabilitating pipe insertion jig 20. As shown in these figures, the jig 20 for inserting the rehabilitation pipe
Is provided with a pair of left and right guide members 21, 22 and a support member 23 for supporting the guide members 21, 22.

Each of the guide members 21 and 22 is a pipe member having a circular cross section (for example, an outer diameter of 30 mm), and is opposed to each other with a predetermined interval. This interval substantially corresponds to the dimension (for example, 50 mm) in the short side direction of the rehabilitation pipe 1. Preferably, the dimension is set to be slightly smaller than the dimension of the rehabilitation pipe 1 in the short side direction. That is, when the rehabilitation pipe 1 passes between the guide members 21 and 22, both sides in the short side direction of the rehabilitation pipe 1 slide on the guide members 21 and 22 as shown by imaginary lines in FIG. It has a moving attitude and can be regulated. The length dimension (vertical dimension in FIG. 1A) of each of the guide members 21 and 22 is set larger than the dimension of the rehabilitating pipe 1 in the long side direction (for example, 500 mm).

The support member 23 includes a bottom plate 24 and two side plates 25 and 26. The bottom plate 24 is a plate material having a rectangular shape in a plan view. Each of the guide members 21 and 22 has a bottom plate 2
4 is welded near one side (upper side in FIG. 1B). Each of the side plates 25, 26 is a triangular (right-angled triangular) plate material. One side of these side plates 25, 26 is welded to one side of the bottom plate 24 (the side to which each guide member 21, 22 is welded), and the other side is welded to the guide members 21, 2.
It is welded to the side surface of No. 2. The bottom plate 24 and the two side plates 25 and 26 enable the guide members 21 and 22 to be self-supporting.

-Description of Lining Work- Next, the lining work of the rehabilitation pipe 1 will be described. The lining work includes a process of inserting the rehabilitating pipe 1 using the rehabilitating pipe inserting jig 20, a process of expanding the rehabilitating pipe 1, and a process of treating the tip of the rehabilitating pipe 1. In the present embodiment, as shown in FIG. 3, the rehabilitation pipe 1
Prior to the insertion step, the inner surface of the main pipe 2 is similar to the rehabilitation pipe 3
Is lined in advance, and a sleeve-shaped attachment pipe port 3a raised inside the attachment pipe 8 is formed at the connection point with the attachment pipe (existing pipe) 8 in the rehabilitation pipe 3 (FIG. 4). reference).

<Rehabilitation pipe insertion process> In this process, as shown in FIG. 3, the rehabilitation pipe 1 is fed out into the mounting pipe 8 from the winding machine 7 installed near the surface of the box 6 side, while the retraction pipe is inserted. The wire 5 connected to 4 is pulled by the winch 10 through the main pipe 2 and the manhole 9. Reference numerals 11 and 12 are pulleys that change the trajectory of the wire 5, and the main pipe 2
It is installed on the inner bottom surface of.

In this inserting step, the rehabilitating pipe inserting jig 20 is installed on the ground surface near the box 6, and the rehabilitating pipe 1 fed from the winder 7 into the mounting pipe 8 is It will pass through the rehabilitating pipe insertion jig 20. That is, as shown by the phantom line in FIG. 1, the posture of the rehabilitation pipe 1 is regulated so that both sides in the short side direction of the rehabilitation pipe 1 slide on the respective guide members 21 and 22 and toward the inside of the mounting pipe 8. The feeding operation is performed. For this reason, the rehabilitation pipe 1 has the fold-shaped portion 1 described above.
While being folded into a predetermined shape having a, it is guided by the guide members 21 and 22 while eliminating the twist, and is inserted into the rehabilitation tube insertion port of the mounting tube 8 through the box 6.

In the step of inserting the rehabilitation pipe 1, in order to smoothly insert the rehabilitation pipe 1 into the mounting pipe 8, the rehabilitation pipe 1 may be previously heated with steam to have flexibility. In this case, each guide member 21, 2
The distance between the two can be made shorter than the dimension of the rehabilitating pipe 1 in the short side direction to some extent. Because each guide member 2
This is because the rehabilitation pipe 1 is deformed so that the length in the short side direction changes depending on the distance between the first and second members.

<Step of Expanding Diameter of Rehabilitation Pipe> By inserting work of the rehabilitation pipe 1, as shown in FIG. 4, the tip of the rehabilitation pipe 1 accompanied by the lead-in plug 4 reaches the inside of the main pipe 2. Subsequently, as shown in FIG. 5, steam gas is blown into the rehabilitating pipe 1 to heat and expand the rehabilitating pipe 1. At the time of heat expansion, as shown in FIG. 6, the feeding end of the rehabilitation pipe 1 is cut, and the socket 13 is provided in the cut portion in an airtight state. An air supply hose 15 and an exhaust hose 16 from a steam generation heater 14 installed on the ground are connected to the socket 13. Then, when high-temperature, high-pressure steam is blown from the air supply hose 15, the rehabilitation pipe 1 expands due to the pressure of the steam, and FIGS.
As shown in FIG. 5, the diameter of the fold-shaped portion 1a is reduced while the diameter of the fold-shaped portion 1a is increased, and the fold portion 1a is brought into close contact with the inner surface of the mounting tube 8 as shown in FIG. The exhaust hose 16 is for discharging excess water vapor out of the pipe.

In the diameter expanding step, the rehabilitating tube 1 is folded in the predetermined shape having the fold-shaped portion 1a in the inserting step, and the guide members 21 and 22 are kept.
Since it is inserted into the mounting pipe 8 while the twist is eliminated by the above, the occurrence of wrinkles during the main diameter expansion step is suppressed. As a result, the deterioration of the strength of the rehabilitation pipe 1 due to the occurrence of wrinkles can be avoided, and the attachment pipe 8 can be sufficiently reinforced.

<Treatment process of rehabilitating pipe tip> Next, as shown in FIG. 8, the tip of the rehabilitating pipe 1 protruding into the main pipe 2 is cut off by a cutting machine 17 carried into the main pipe 2, The cut end 1b of the rehabilitation pipe 1 is opened in the main pipe 2. At this time, the cut end 1b of the rehabilitating pipe 1 is slightly projected into the main pipe 2 so that the protruding portion 1c of the rehabilitating pipe 1 is left in the main pipe 2. Then, as shown in FIG. 9, the cut end 1b of the protruding portion 1c is spread from below by the heat molding device 18 carried into the main pipe 2 to form a flange-shaped flange 1d as shown in FIG. Since the flange 1d thus formed covers the periphery of the attachment pipe port 3a along the inner surface of the main pipe 2, good water shutoff can be obtained even at the connection portion between the main pipe 2 and the attachment pipe 8.

-Effect of Embodiment-As described above, in the present embodiment, the rehabilitating pipe insertion jig 2 is used.
The rehabilitation pipe 1 is inserted into the mounting pipe 8 while the twist is eliminated by the guide members 21 and 22 of 0. Therefore, the occurrence of wrinkles during the diameter expansion step is suppressed, and the mounting pipe 8 can be sufficiently reinforced.

-Other Embodiments-In the above-described embodiment, the case where the rehabilitating pipe insertion jig 20 is installed so that the guide members 21 and 22 are in the upright state has been described, but as shown in FIG. Guide member 21,
You may make it perform the insertion process of the rehabilitation tube 1 in the state where 22 was laid down.

[0030]

As described above, according to the present invention, there is provided a jig for rehabilitating pipe insertion capable of inserting the rehabilitating pipe into the existing pipe while eliminating the twist of the rehabilitating pipe by each guide member. Since it is arranged near the rehabilitating pipe insertion port, it becomes possible to insert the rehabilitating pipe into the existing pipe without twisting. Therefore, wrinkles in the rehabilitation pipe are suppressed from occurring during the diameter expansion process, the existing pipe can be sufficiently reinforced with the rehabilitation pipe, and deterioration of the existing pipe over time can be suppressed.

[Brief description of drawings]

1A is a front view of a rehabilitating pipe insertion jig, and FIG. 1B is a plan view of a rehabilitating pipe insertion jig.

FIG. 2 is a partial perspective view showing a configuration example of a rehabilitation pipe.

FIG. 3 is a vertical cross-sectional view of an underground conduit showing an outline of a step of inserting a rehabilitation pipe into a mounting pipe.

FIG. 4 is a partial vertical cross-sectional view of an underground conduit connection portion showing a state in which a rehabilitation pipe is inserted into a mounting pipe.

FIG. 5 is a partial vertical cross-sectional view of an underground pipe connecting portion showing a state in which a diameter-enhanced rehabilitating pipe is brought into close contact with an inner surface of a mounting pipe.

FIG. 6 is a vertical cross-sectional view of an underground conduit showing an outline of a step of expanding the diameter of a rehabilitation pipe in a mounting pipe.

FIG. 7 is a cross-sectional view showing the expanded diameter state of the rehabilitation pipe in the order of (a) to (c).

FIG. 8 is a partial vertical cross-sectional view of an underground pipe line connecting portion showing a step of cutting the tip end portion of the diameter-enhanced rehabilitation pipe with a cutting machine.

FIG. 9 is a partial vertical cross-sectional view of an underground pipe line connecting portion showing a state in which a thermoforming device is pressed against a projecting portion of a rehabilitating pipe when a flange is formed on the tip of the rehabilitating pipe.

FIG. 10 is a partial vertical cross-sectional view of an underground pipe line connecting portion showing a state of a flange formed at a tip portion of a rehabilitation pipe.

FIG. 11 shows a case where the rehabilitating pipe insertion step is performed in a state where each guide member is laid down, (a) is a plan view showing an installed state of a rehabilitating pipe inserting jig, and (b) is a plan view. It is a side view which shows the installation state of the jig for rehabilitation pipe insertion.

[Explanation of symbols]

1 Rehabilitation pipe 2 main pipes (existing pipes) 8 Mounting pipe (existing pipe) 20 Rehabilitation pipe insertion jig 21,22 Guide member (guide part)

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Claims (2)

[Claims] 1. A method for inserting the rehabilitating pipe into the existing pipe by reducing the cross-sectional shape of the rehabilitating pipe for lining the inner surface of the existing pipe to facilitate insertion into the existing pipe. The reduced cross-sectional shape of the rehabilitating pipe is such that the rehabilitating pipe has a short-side direction and a long-side direction. A rehabilitating pipe insertion jig having a pair of guide portions facing each other at an interval substantially corresponding to the dimension of the rehabilitating pipe in the shape of the short side is disposed, Inserting the rehabilitating pipe through the rehabilitating pipe insertion jig so that both sides of the rehabilitating pipe abut on the guide parts and are guided so that the rehabilitating pipe is inserted into the existing pipe from the rehabilitating pipe insertion opening. Method. 2. The rehabilitating pipe for lining the inner surface of the existing pipe is reduced in cross-sectional shape so as to be easily inserted into the existing pipe, and is used when the rehabilitating pipe is inserted into the existing pipe. A jig for rehabilitating pipe insertion, wherein the reduced cross-sectional shape of the rehabilitating pipe is such that the rehabilitating pipe has a short side direction and a long side direction. The guide parts are provided near the mouth and face each other in the short side direction of the rehabilitating pipe so as to guide each other with a space substantially corresponding to the dimension in the short side direction of the rehabilitating pipe having the reduced cross-sectional shape. A jig for rehabilitating pipe insertion, which is characterized by being provided.