JP2002156071A - Piping method for polyethylene pipe body into existing pipeline - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a piping method for a polyethylene pipe body into an existing pipeline capable of dispensing with the connection of a joint having a water supply pipe connection part or a joint having a snap tap and a sluice valve connection part or a joint having a hydrant connection part, to the flexible polyethylene pipe after piping in the existing pipeline and allowing easy installation of a water supply branch pipe, a sluice valve, and a fire hydrant later. SOLUTION: In this piping method for the polyethylene pipe body in the existing pipeline in which the polyethylene pipe body 1 is introduced and piped into the existing pipeline 5 by holding a tip of the long polyethylene pipe body 1 to be piped by a cable grip 2 and pulling the cable grip 2 by a rope or a wire 3, such polyethylene pipe body that incorporates at least one kind of the joint having the water supply pipe connection part, the joint having the snap tap and the sluice valve connection part, and the joint having the hydrant connection part on the halfway in advance is used as the polyethylene pipe body 1 before it is introduced into the existing pipeline 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for piping a polyethylene pipe into an existing pipeline.

[0002]

2. Description of the Related Art Conventionally, as a method of rehabilitating an aging existing pipeline made of reinforced concrete pipe (fume pipe) or steel pipe, a new resin pipe of a predetermined length is inserted into the existing pipeline while sequentially connecting the pipes. There is known a method of laying a rehabilitating pipe and injecting a backfill material such as mortar or a foaming resin material between the pipe and the existing pipe to seal the pipe.

[0003] In recent years, seismic-type high-performance polyethylene pipes have attracted attention as resin pipes for water supply. When such a polyethylene pipe is used as the resin pipe of the above-mentioned conventional method, it becomes necessary to install a water supply branch pipe, a gate valve, a fire hydrant, etc. at a later date in the polyethylene pipe laid in the existing pipe. In the case of digging the soil, drilling a through hole in the existing pipe, and trying to connect through the through hole,
Since the polyethylene pipe has flexibility, it is liable to be crushed or rotated, and there is a problem that it is very difficult to perform the work of providing a water supply pipe connection, a gate valve connection, and a fire hydrant connection.

[0004]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems in the prior art, and provides a flexible polyethylene pipe having a post-piping joint in an existing pipeline with a joint having a water supply pipe connection or a joint. It is not necessary to connect a faucet, a joint having a sluice valve connection part or a joint having a fire hydrant connection part. The purpose of the present invention is to provide a method for piping a polyethylene pipe into a pipe.

[0005]

The invention according to claim 1 of the present application (the present invention 1) holds a distal end of a long polyethylene pipe to be piped with a cable grip, and attaches the cable grip to a rope or a rope. A method of piping a polyethylene pipe into an existing pipeline, in which the polyethylene pipe is introduced and piped into an existing pipeline by pulling with a wire, wherein the polyethylene is not introduced into the existing pipeline. An existing pipe using at least one of a joint having a water supply pipe connection or a water tap, a joint having a gate valve connection, or a joint having a fire hydrant connection in the middle thereof. This is a method of piping a polyethylene pipe into a pipe.

[0006] The invention described in claim 2 of the present application (Invention 2)
As the polyethylene pipe, a rotation preventing member is provided in the vicinity of at least one of a fitting or a water faucet having a water pipe connecting portion incorporated in advance, a fitting having a gate valve connecting portion, and a fitting having a fire hydrant connecting portion. This is a method of piping a polyethylene pipe into an existing pipe using the fitted pipe.

[0007]

According to the method of piping a polyethylene pipe into an existing pipeline according to the present invention, the polyethylene pipe before being introduced into the existing pipeline is provided with a joint or a splitter having a water supply pipe connection part in the middle thereof. By using at least one of a faucet, a fitting having a sluice valve connection part, or a fitting having a hydrant sluice connection part, at a later date, piping of a water supply branch pipe, setting of a sluice valve, setting of a fire hydrant, etc. When the need arises, excavate the soil, make a through hole in the existing piping, and provide a water supply pipe connection part, a gate valve connection part, and a fire hydrant connection part to the flexible polyethylene pipe through the through hole. Connect the water pipe to the pre-installed water pipe connection of the fitting or water faucet, connect the gate valve to the gate valve connection of the fitting, or connect the fire hydrant connection of the fitting without difficult work. Connect fire hydrant It is only that, it is possible to very easily their connection work can be laid a conduit to easily existing conduit with polyethylene tubes.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view illustrating an example of a polyethylene pipe used in the method of piping a polyethylene pipe into an existing pipeline according to the present invention.

In FIG. 1, reference numeral 1 denotes a long polyethylene pipe introduced into an existing pipeline, and a single straight pipe 12 is connected to a distal end of a polyethylene pipe main body 11. As shown in FIG. 2, the one-side straight pipe 12 is made of polyethylene, and has a receiving port 122 at one end of a straight pipe portion 121.
The heating wire 123 is embedded in the tube wall forming the receiving port 122. The heating wire 12 is provided on the outer surface of the receiving port 122.
3 are provided with terminals 124, 124 for energizing. The distal end of the polyethylene pipe main body 11 is inserted into the receiving port 121, and is welded by an electric fusion method.

A cable grip 2 is attached to the other end of the straight pipe 12 so as to hold the outer surface thereof.
The cable grip 2 can be pulled by a winch 4 via a wire 3.

In the middle of the polyethylene pipe 1, a T-shaped joint 13 having a water supply pipe connection and a water tap 14 with a saddle are provided.
And is incorporated. As shown in FIG. 3, the T-shaped pipe joint 13 has main pipe receiving portions 131, 131 having heating wires embedded at both ends thereof, and a water supply pipe connection flange 132. Main pipe receiving portions 131 of the T-shaped joint 13
The cut end of the polyethylene pipe main body 11 is inserted therein, and is welded by an electric fusion method. A blind plate (not shown) is fastened to the water supply pipe connection flange 132.

As shown in FIG. 4, the water tap 14 with a saddle has a through hole 141a serving as a water diversion port, and a saddle 141 in which a heating wire 141b is embedded on the inner surface of the periphery of the through hole 141a. And the through hole 141 of the saddle 141
and a water supply pipe connecting portion 142 erected on the outer surface side around the portion a. The diversion pipe fitting 14 with a saddle is mounted on the outer surface side around a through hole provided in the middle of the polyethylene pipe main body 11 so that the saddle 141 is straddled, and is welded by an electric fusion method. A cap 143 is put on the water supply pipe connection part 142.

On both sides of a portion of the polyethylene pipe body 1 where the T-joint 13 and the water tap 14 with a saddle are incorporated, rotation preventing members 15 are respectively mounted. As shown in FIG. 5, the anti-rotation member 15 is a three-piece ring having an inner diameter that can be fitted to the polyethylene pipe main body 11, and has a plurality of strips on its outer peripheral surface that contact the inner peripheral surface of the existing pipe. Are provided along the axial direction. The rotation preventing member 15 is fitted on the polyethylene pipe main body 11 so as to be fastened by a fastener.

Hereinafter, the steps of an example of a method for piping a polyethylene pipe into an existing pipeline according to the present invention using the polyethylene pipe 1 shown in FIG. 1 will be described with reference to FIG. First, FIG.
As shown in (a), a spare line 62 is connected to a balloon 61, and compressed air 63 is blown onto the balloon 61 from a blower or a compressor 64, and the existing pipeline 5
Flying from one end to the other end of the
Through the existing pipeline 5. A wire is tied to one end of the spare line 62, and the wire is inserted into the existing pipeline 5 by approaching from the other end of the existing pipeline 5.

Next, as shown in FIG. 6B, one end of the wire 3 is connected to the cable grip 2 attached to the tip of the polyethylene tube 1 shown in FIG. As a result, in the existing pipeline 5,
The polyethylene pipe 1 in which a T-shaped pipe joint 13 having a water supply pipe connection part and a water tap 14 with a saddle are incorporated is introduced. Thereafter, both ends of the introduced polyethylene pipe 1 are connected to a pipe, and the pipe is terminated. In this manner, the pipe formed by the polyethylene pipe 1 introduced into the existing pipe line 5 is in a state where the T-shaped joint 13 and the water tap with saddle 14 are incorporated.

FIG. 7 is a front view for explaining another example of the polyethylene pipe used in the method of piping a polyethylene pipe into an existing pipeline according to the present invention. Reference numeral 7 denotes a long polyethylene pipe introduced into the existing pipeline, and a single straight pipe 72 is connected to the distal end of the polyethylene pipe main body 71 in the same manner as described with reference to FIG. At the other end, a cable grip 2 is mounted.

In the middle of the polyethylene pipe 7, a joint 73 having a gate or a fire hydrant connection is connected. The pipe joint 73 has main pipe connection flanges 731 and 73 at both ends.
1 is provided, and a gate valve or a fire hydrant connection flange 732 is provided at the center. A blind plate (not shown) is fastened to the gate valve or fire hydrant connection flange 732.

The piping into the existing pipeline using the polyethylene pipe 7 can be performed in exactly the same manner as described with reference to FIG.

[0019]

The method of piping a polyethylene pipe into an existing pipeline according to the present invention is configured as described above.
There is no need to connect a fitting having a water supply pipe connection or a water tap, a fitting having a sluice valve connection or a fitting having a fire hydrant connection to a polyethylene pipe having flexibility after piping in the existing pipeline. In addition, pipes of polyethylene pipes, which can easily carry out piping of water supply branch pipes, installation of gate valves, installation of fire hydrants, and the like, can be laid in the existing pipeline.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of a polyethylene pipe used in the present invention.

FIG. 2 is a partial cross-sectional view showing a single receiving straight pipe constituting the polyethylene pipe shown in FIG.

FIG. 3 is a partial cross-sectional view showing a T-shaped pipe joint constituting the polyethylene pipe shown in FIG.

FIG. 4 is a partial sectional view showing a water faucet with a saddle constituting the polyethylene pipe shown in FIG. 1;

FIG. 5 is a partial sectional view showing a rotation preventing member constituting the polyethylene pipe shown in FIG. 1;

FIG. 6 is an explanatory view of a step of an example of a method for piping a polyethylene pipe into an existing pipeline according to the present invention using the polyethylene pipe shown in FIG. 1, wherein (a) illustrates the first step. FIG. 3B is a partial cross-sectional view illustrating a second step.

FIG. 7 is a front view showing another example of the polyethylene pipe used in the present invention.

[Explanation of symbols]

 1,7 Polyethylene pipe 2 Cable grip 3 Wire 4 Winch 5 Existing pipeline 11,71 Polyethylene pipe main body 12,72 One-sided straight pipe 13 T-shaped pipe joint 14 Saddle with water saddle 15 Rotation prevention member 73 Joint

Claims (2)

[Claims] An end of a long polyethylene pipe to be piped is held by a cable grip, and the cable grip is pulled by a rope or a wire to introduce the polyethylene pipe into an existing pipeline. A method of piping a polyethylene pipe into an existing pipeline to be piped, wherein the polyethylene pipe before being introduced into the existing pipeline,
On the way, it is characterized in that a joint or a water tap having a water supply pipe connection, a joint having a gate valve connection, or a joint having at least one of a joint having a fire hydrant connection is previously used. Piping method of polyethylene pipe into existing pipeline. 2. The method according to claim 1, wherein the polyethylene pipe is rotated near at least one of a fitting having a water supply pipe connection or a water tap, a fitting having a sluice valve connection, and a fitting having a fire hydrant connection. The method for piping a polyethylene pipe into an existing pipeline according to claim 1, wherein a pipe having a prevention member fitted thereto is used.