JP2002106751A - New tapping method from existing duct - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method capable of new tapping without causing the belch of gas by simple work when renewal is completed or even if it is not clear that renewal is completed. SOLUTION: This construction method is used for newly tapping a duct from a renewal pipe P and characterized in that a clamp means 1 for drilling is installed around the tapping position of the renewal pipe P to isolate the periphery of the drilled part at the tapping position from the outside, both the clamp means 1 for drilling and the renewal pipe P are drilled at the tapping position, a joint member 2 having a flexible joint part 2A at an end part is so inserted into the drilled position as to position the joint part 2A in the renewal pipe P, and the joint part 2A is allowed to abut on and jointed to the periphery of the drilled position of the renewal pipe P.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for newly extracting a pipe from an existing pipeline, and more particularly to a method for newly forming a branch portion for a pipeline which has been rehabilitated and renewed. .

[0002]

2. Description of the Related Art In metal pipelines such as cast iron pipes buried underground, corroded holes are generated in some parts due to aging, etc. Leakage is likely to occur. In the past, repair work was performed on such locations.However, the work methods include rehabilitation work with resin lining on the inner surface and new pipe material installed in an old pipe that has been deteriorated. There is a so-called renewal construction in which a new pipe is inserted by being drawn into the pipe. A new take-out portion such as a branch portion may be formed for such a rehabilitated or renewed pipeline. The following methods are known as a new extraction method.

In the first method, as shown in FIG. 2A, for example, a new pipe (hereinafter referred to as an update pipe) P1 made of a resin pipe such as a PE pipe is inserted into an aged pipe P. In the case where the renewal method has been applied, a no-blowing back (not shown) is attached to the branch portion of the aged pipe P, and a hole H is formed. As shown in FIG.
The saddle SA of the branch joint S for connecting the branch pipe P2 to the outer peripheral surface where the opening is located is brought into contact with and integrated. At the time of integration, fusion is used utilizing the material of the renewal pipe P1. Instead of the case of piercing, FIG.
As shown in (D), a part of the deteriorated pipe P may be cut and crushed to directly expose the renewal pipe P1, and then the branch joint S may be attached to the renewal pipe P1.

[0004]

In the method shown in FIGS. 2C and 2D, this method may not be applicable depending on the target pipe. In other words, although it can be applied to a material that is easily brittle, such as a cast iron tube, it is difficult to crush after cutting in a pipe line that is relatively easy to elongate, such as a steel pipe, so the number of work steps increases. There is a fear. On the other hand, when it is unknown whether the pipe to be newly taken out has been rehabilitated or renewed, the pipe is also subject to the work. For this reason, when a pipe is inadvertently exposed as a renewed pipe as an old pipe, if there is no renewal pipe in the inside, there is a risk that gas will blow out from the pipe. Therefore, an operation for detecting the presence of the update pipe is required, and there is a problem that it takes time to take out a new pipe.

[0005] In view of the above-mentioned problems in the conventional new take-out method, it is an object of the present invention to make it possible to carry out a new take-out without generating gas ejection by a simple operation even when it is not clear that the gas has been renewed or renewed. To provide a construction method.

[0006]

In order to achieve this object, an invention according to claim 1 is a construction method for newly taking out a pipeline from an existing pipeline, wherein a method for removing a new pipeline from the existing pipeline is provided. And a peripheral portion of the perforated portion at the take-out position is shielded from the outside, an existing pipeline is perforated at the take-out position, and a flexible joint is provided at the end of the perforated position at the take-out position. The joint member is inserted in such a manner that the joint is located in the existing pipeline, and the joint is brought into contact with a periphery of a perforated position of the existing pipeline to be joined.

According to a second aspect of the present invention, there is provided a method for newly taking out from an existing pipeline according to the first aspect, wherein a joint portion of the joint member is provided on a surface opposed to an inner peripheral surface of a piercing position of the existing pipeline. It is characterized in that bonding means necessary for joining are provided.

[0008] The invention described in claim 3 is claim 1 or 2.
In the method for newly removing from an existing pipeline as described above, the drilling clamp means is integrally joined to an outer periphery of a joint member inserted into a drilled portion formed in the drilling means, and the inner surface of the drilled portion and the joint member are joined together. Is characterized in that a configuration for sealing the outer peripheral portion with the outer peripheral portion is provided.

According to the first aspect of the present invention, since the joint member inserted into the drilling position has the joint located on the inner surface of the existing pipeline, it is possible to obtain a state in which the drilled portion is sealed from the inside of the pipe. Thus, gas emission from the pipeline is suppressed, so that gas emission can be prevented even when the update pipe does not exist in the existing pipeline.

According to the second aspect of the present invention, since the bonding means necessary for bonding is provided on the surface of the joint portion of the joint member facing the inner peripheral surface of the conduit, the joint is inserted after the joint member is inserted into the pipe. The parts can be integrated simply by contacting them with the inner peripheral surface of the conduit.

According to the third aspect of the present invention, the insertion portion of the joint member is sealed by integrally joining the perforating clamp means with the joint member. However, the ejection of gas from the inside of the pipe is completely shut off at the insertion portion of the joint member.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram for explaining a procedure of a new take-out method according to an embodiment of the present invention. FIG.
2 is intended for a case where a branch pipe is taken out from an existing pipeline (for convenience, the symbol P shown in FIG. 2 is used) via a branch joint. FIG. 1 (A)
In the above, at the branch take-out position, a half-shaped perforated clamp means 1 capable of surrounding the outer periphery thereof is attached to shield the periphery of the perforation position. This drilling clamp means 1
It is attached in close contact with the outer peripheral surface of an existing pipeline (not shown). When the perforating clamp means 1 is attached, a perforation device such as a hole saw (for convenience, a perforated portion is shown in a pipe shape in FIG. 1) is provided on a perforated guide portion 1A provided on a part of the peripheral surface thereof. An existing pipe and an update pipe indicated by reference numeral P are inserted in the direction of the arrow shown in the figure to pierce the pipe.

In FIG. 1B, when the perforation of the existing pipeline P is completed, the joint member 2 is attached. The joint member 2 is provided with a clamp means 1 for drilling toward the renewal pipe P.
A flexible joint 2A having an outer dimension larger than the diameter of the perforation is provided at the end inserted from the perforation. In this embodiment, the joint member is made of a material such as nylon or polyethylene resin, and the joint 2A is made of the same material.

A bonding means indicated by reference numeral 3 in FIG. 1B is provided in advance on a surface of the joining portion 2A facing the inner peripheral surface of the updating pipe P. As the bonding means 3, a heater wire to which an adhesive or a resin can be fused is used.

The joint member 2 is inserted from the perforation guide 1A of the perforation clamping means 1 into the perforated portion of the update pipe P in FIG. At this time, the joining portion 2A is connected to the perforation guide portion 1A of the perforation clamping means 1 and the updating pipe P.
When it enters the perforated portion, it is bent and deformed into a shape that can pass through the perforated portion, and is inserted. Joint 2A
When it is located inside the updating pipe P, it returns to its original shape due to its own bending behavior, and faces the inner peripheral surface of the updating pipe P.

When the joint 2A is inserted into the update pipe P, the joint member 2 is pulled up to a position where the joint 2A comes into contact with the inner peripheral surface of the update pipe P in FIG. 2A is joined and integrated around the perforated portion on the inner peripheral surface of the existing pipeline. When an adhesive is used as the bonding means 3 of the bonding portion 2A, the bonding portion 2A is held so as not to be separated from the inner peripheral surface of the renewal pipe P until the adhesive is hardened, and a heater wire is used. Until the fusion is completed.
The contact state between A and the inner peripheral surface of the pipeline is maintained. This allows
The perforated portion of the renewal pipe P is sealed from the inner peripheral surface side of the pipe, so that the gas is not spouted from the inside of the pipe.

On the other hand, the drilling clamp means 1 is provided with a clamp means 4 which is integrated with the joint member 2 and is held in advance in advance. The clamp means 4 is made of the same material as the joint member 2, and is integrally joined to the joint member 2 by a welding action using a heater wire or the like. Thereby, even if there is gas ejected from the update pipe P, since it is shielded at the perforated portion of the perforated clamp means 1, ejection to the outside is prevented.

When the joint member 2 is installed, the renewal pipe P may not exist in the existing pipeline. This state cannot be confirmed from outside the pipeline. When installing the joint member 2 in such a situation,
After the drilling clamp means 1 is attached to the existing pipeline,
In the same manner as described above, the joint 2A comes into contact with the inner surface of the existing pipe having a different material from that of the renewal pipe. The joint 2A and the existing pipe are made of different materials, and the effect of the bonding means 3 may not be reached. In this case, the inside of the drilling clamp unit 1 is isolated from the outside by the clamp unit 4 to which the joint member 2 is integrally joined, so that gas is prevented from being ejected from the existing pipeline.

According to the above embodiment, since the positioning can be performed by a simple operation of bringing the joint 2A into contact with the inner peripheral surface of the renewal pipe P, a procedure for confirming the contact state is not required. No problem. In addition, as the renewal pipe P in the above embodiment, a straight pipe or a corrugated pipe using a resin pipe such as a polyethylene pipe can be used. Also,
The shape of the joint 2A is not limited to a shape corresponding to the diameter of the pipeline known in advance, but may be any shape as long as it is pulled up and pressure-contacted or closely attached to the inner surface of the pipeline.

[0020]

According to the first aspect of the present invention, since the joint member inserted into the drilling position has the joint located on the inner surface of the existing pipeline, a state in which the drilling portion is sealed from the inside of the pipe can be obtained. . Thus, gas emission from the pipeline is suppressed, so that gas emission can be prevented even when the update pipe does not exist in the existing pipeline. Thus, it is possible to pierce even if information on the existence of the update pipe in the existing pipeline is unknown.

According to the second aspect of the present invention, the bonding means necessary for bonding is provided on the surface of the joint portion facing the inner peripheral surface of the conduit, so that after the fitting is inserted into the pipe, the bonding is performed. The parts can be integrated simply by contacting them with the inner peripheral surface of the conduit. This makes it possible to attach the joint member to the pipeline with the same strength as when joined to the pipeline outer peripheral surface.

According to the third aspect of the present invention, the inner peripheral surface of the perforated portion and the outer peripheral portion of the joint member can be hermetically sealed in the insertion portion of the joint member in the perforating clamp means, so that gas from the inside of the pipeline can be sealed. Even if there is ejection, ejection to the outside is reliably prevented by the clamp means.

[Brief description of the drawings]

FIG. 1 is a diagram showing a procedure of a new take-out method according to an embodiment of the present invention.

FIGS. 2A and 2B are diagrams for explaining a conventional example relating to a new take-out method, in which FIG. 2A is an external view at the time of drilling, FIG. 2B is an arrow view in the direction indicated by reference numeral (B) in FIG. (C) is an external view after crushing, and (D) is an arrow view in the direction indicated by reference numeral (D) in (C).

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Perforation clamp means 2 Joint member 2A Joining part 3 Adhesion means 4 Clamp means for sealing a perforated part

Claims (3)

[Claims] 1. A method for taking out a new pipeline from an existing pipeline, wherein a perforation clamping means is mounted around a take-out position of the existing pipeline, and a periphery of a perforated portion at the take-out position is externally provided. An existing pipe line is pierced with respect to the take-out position, and a joint member having a flexible joint portion at an end thereof with respect to the piercing position is arranged such that the joint portion is located within the existing pipe line. A new method of taking out from an existing pipeline, wherein the joining portion is brought into contact with a periphery of a perforated position of the existing pipeline and joined. 2. A method according to claim 1, wherein the joining portion of the joint member is provided with a bonding means necessary for bonding to a surface of the existing pipeline facing an inner peripheral surface at a piercing position. A new method of extracting from existing pipelines. 3. The method of claim 1, wherein said clamp means for perforating is integrally joined to an outer periphery of a joint member inserted into a perforated portion formed in said means. And a method for providing a seal between the inner surface of the perforated portion and the outer peripheral portion of the joint member.