JPH0861561A - Pipe replacement work method - Google Patents

Abstract

PURPOSE: To provide a method of replacing an old pipe properly with an update pipe by preventing the old pipe from slipping off. CONSTITUTION: A traction member 4 is inserted through an old pipe 1 from the side with the pit 2 as target, and the end of the traction member 4 is allowed to reach the side with a starting pit 3, and a pipe splitter 5 to make diametric enlargement by splitting the old pipe 1 in the axial direction.is connected with the end of the traction member 4 on the side with the starting pit 3, and also an updating PE pipe is connected serially to the rear stage of the pipe splitter 5. The traction is made so that the reaction force produced by the traction force acts on the end 1a of the old pipe 1 confronting the target pit 2 when the traction member 4 is tracted by a traction device 7 installed on the side with the target pit 2 so as to thread the pipe splitter 5 and PE pipe through the old pipe 1 from the side with the starting pit 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a replacement pipe replacement method for drawing a new pipe into an aged pipe buried in the ground without digging, and more specifically, a replacement pipe to be performed without the aged pipe coming out of the ground. Regarding replacement method.

[0002]

2. Description of the Related Art Pipelines such as gas pipes and water pipes that have been buried in the ground for many years have been corroded and deteriorated due to their long-term construction, and there is a concern that they may leak from defective parts such as pinholes. It There are various methods for solving the problem, and one of them is a replacement pipe replacement method in which an old pipe is broken by non-opening and a new pipe is drawn into the old pipe. In this method, the existing aged pipe is broken in the axial direction of the pipe to expand its diameter, and a new pipe such as a PE pipe having an inner diameter similar to the inner diameter of the existing pipe is drawn into the aged pipe. Therefore, since the inner diameter is the same, it is possible to secure the same supply amount as before, and there is an advantage that the old pipe covers the new pipe and the old pipe serves as a cover to protect the new pipe from other works.

As an example of the replacement pipe replacement method,
For example, as shown in FIGS. 5 (a) and 5 (b), a starting shaft b and a reaching shaft c are provided at the end of the aging pipe a for replacing the renewal pipe, and the pipeline is broken in the starting shaft b. A propulsion device e for advancing the excavator d to be spread is installed, and a winch f for pulling the excavator d is installed on the side of the reaching shaft c. Further, the excavator d is provided with a breaking blade d1 that cuts and spreads the pipe line at the tip end and connects a new pipe g at the rear end, and the excavator d further includes a compressor h from the compressor h. It has a piston that moves by receiving compressed air. The piston of the excavator d is shockedly moved to intermittently move the excavator d in the pipe a, and the winch h is pulled to break the aged pipe a.
The diameter is expanded and the new pipe is drawn in (Japanese Patent Publication 6-4
3877 publication).

[0004]

By the way, the pipe line (aged pipe) used for the replacement pipe replacement method is made of metal and has a wall pressure of about 3 to 4 mm. A breaking member for expanding the diameter while cutting the pipe line is used. A considerably large traction force (pushing force) is required to move the pipe. Therefore, in the case of the replacement pipe replacement method including the preceding example described above, in order to receive the reaction force generated by the traction force, it is necessary to provide a special mountain retaining on the inner wall of the shaft, and it takes a lot of time to create the shaft. Costly. Furthermore, since the breaking member is moved in the pipeline with a large traction force (pushing force), a large force is applied in the axial direction of the aged pipe, the aged pipe slips out into the reaching shaft, and the replacement pipe is replaced properly. The problem arises that the construction method cannot be applied.

The present invention has been invented to solve these problems, and an object of the present invention is to provide a construction method capable of preventing replacement of an aged pipe and properly replacing a renewal pipe.

[0006]

In order to achieve the above object, the present invention provides a working vertical shaft and a secondary vertical shaft on the path of an existing pipeline buried in the ground, and a compatible shaft. In the non-open cutting replacement method of the renewal pipe that breaks and expands the old pipe laid between the two and draws the new pipe into the old pipe,
The traction member is inserted into the pipe of the aged pipe from the side of the first shaft to make the end of the traction member reach the side of the second shaft, and the pipe of the aged pipe is attached to the end of the traction member on the side of the second shaft. A pipe breaking member that splits and expands in diameter is connected to the pipe breaking member, and a new pipe for renewal is connected in series at the subsequent stage of the pipe breaking member, and the pulling member is installed by the pulling means installed on the first shaft side. When pulling the pipe breaking member and the new pipe for renewal into the inside of the aged pipe from the side of the second shaft, the pulling reaction force generated by the pulling force is the pipe end of the aged pipe facing the inside of the first shaft. It is characterized by having a traction structure so as to act on.

[0007]

According to the above construction, the pulling reaction force generated when pulling the breaking member acts on the pipe end portion of the aged pipe facing the first shaft, so that the pulling force is applied in the axial direction of the aged pipe. The pulling reaction force can be offset by the pulling reaction force, and the aged pipe is prevented from slipping out into the first shaft. Further, since the pulling reaction force is received by the pipe end of the aging pipe, it is not necessary to provide a special mountain retaining on the shaft inner wall.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing a replacement pipe replacement method according to the present invention, in which a first vertical shaft (reaching vertical shaft) 2 and a second vertical shaft (starting vertical shaft) for working are provided on a path of an aged pipe 1 buried in the ground. 3 are provided, and simple mountain clasps 2a and 3a are provided along the inner wall surface of the reaching shaft 2 and the starting shaft 3 so as not to collapse. Further, a pulling member 4 such as a wire or a rod is inserted from the reaching shaft 2 to the starting shaft 3 in the aged pipe 1, and a pipe splitter 5 described later is connected to an end portion on the starting shaft 3 side. There is.

In the reaching shaft 2, the aged pipe 1 has its pipe end 1a exposed and facing the reaching shaft 2, and the reaction force receiving plate 6 is fixed so as to cover the pipe end 1a. There is. As will be described later in detail, the reaction force receiving plate 6 is made of a metal plate having high rigidity and being hard to be deformed, and is provided with a cut groove 6a through which the pulling member 4 is inserted. Further, a traction device 7 that pulls the traction member 4 is arranged in the reaching shaft 2. The pulling device 7 is installed so that one end side of the pulling device 7 contacts the reaction force receiving plate 6, and the pulling device 7 has a guide shaft 71 positioned perpendicular to the reaction force receiving plate 6.
And a slide member 72 that holds the pulling member 4 and moves along the guide shaft 71, and the slide member 72.
And a hydraulic cylinder 73 that pulls the pulling member 4, and when pulling the pulling member 4, the pulling reaction force is applied to the guide shaft 71.
The reaction force receiving plate 6 is configured to be received via.

FIG. 2 is a view showing the structure of the pipe splitter 5, and the pipe splitter 5 is provided with a screw hole 51 for screw-joining the pipe splitter 5 and the end of the pulling member 4 at the tip end thereof. A guide roller 52 for stably moving the pipe splitter 5 in the aged pipe 1 is provided above the body of the pipe splitter 5, and three wheel cutters 53 for breaking the aged pipe 1 are provided below the body of the pipe splitter 5. It is installed at three locations in the direction, and as shown in the figure,
The diameter of each of the wheel cutters 53 is gradually increased from the front end to the rear end, and the pipe splitter 5 is configured to stably move in the aged pipe 1 and to break the aged pipe 1 in stages. .

An expander 54 for expanding the broken old pipe 1 is connected by a pin 54a to the rear side of the body of the pipe splitter 5, and a PE pipe for a renewal pipe is connected to the rear side of the expander 54. The connection jig 55 for connecting with 8 is connected by screw connection. Where P
At the tip of the E pipe 8, a towing head 81 is provided by being inserted into the pipe 8. By rotating a screw member having a fitting hole at the tip of the towing head 81, the diameter of the portion inserted into the pipe 8 is increased and the towing head 81 and the PE pipe 8 are firmly coupled. When the towing head 81 and the connecting jig 55 are pin-coupled with each other, the pipe splitter 5 and the PE pipe 8 are connected in series. Also,
When the PE pipe 8 is pulled in, the connecting jig 55 is provided with a returning function so that the expander 54 and the connecting jig 55 are not disengaged from each other by twisting of the pipe 8.

FIG. 3 shows the structure of the reaction force receiving plate 6, and the reaction force receiving member 6 shown in the figure is made of a metal having a high rigidity, and a cut for inserting the pulling member 4 therethrough. On a circular metal plate 60 having a groove 6a, a cylinder 61 having a notch having an inner diameter approximately the same as the outer diameter of the aging pipe 1 around the cutting groove 6a is vertically arranged as shown in FIG. 3 (a). It is fixed so as to stand upright. Further, as shown in FIGS. 3 (b) and 3 (c), an abutting portion 62 with which the end portion of the aging pipe 1 abuts is present between the kerf 6a and the cylinder 61. The cut-out of the cylinder 61 is made to match. That is, as shown in FIG. 3D, the reaction force receiving plate 6 is installed at the end of the aging pipe 1 so that the cylinder 61 guides the aging pipe 1.

Next, the operation of the pulling structure of the present invention will be described. First, the reaction force receiving plate 6 is fixed to the pipe end portion 1a of the aged pipe 1 facing the reaching shaft 2 and the pulling member 4 such as a wire or a rod is inserted into the pipe of the aged pipe 1 from the reaching shaft 2 side to start. The end of the traction member 4 reaches the vertical shaft 3 side, and the starting vertical shaft 3
On the side of, the pipe splitter 5 is connected to the end portion, and the PE pipe 8 for updating is connected in series via the connecting jig 55 to the rear side of the pipe splitter 5.
Next, the traction device 7 is installed in the reaching shaft 2 and the traction device 7
The guide shaft 71 is installed so that one end thereof acts on the reaction force receiving plate 6. Then, the pulling member 4 is clamped by the slide member 72, and the slide member 72 is held by the hydraulic cylinder 73.
The towing device 7 is driven so as to tow. Then, due to the pulling force of the pulling device 7, the pipe splitter 5 and the PE pipe 8 move in the direction of the reaching shaft 2, and along with the movement, the aged pipe 1 is broken and expanded in diameter by the pipe splitter 5, and the PE pipe is placed inside the aged pipe 1. 8 is drawn in. that time,
Since the pulling reaction force of the pulling device 7 acts on the pipe end portion 1a of the aged pipe 1 via the guide shaft 71 and the reaction force receiving plate 6, it is loaded in the axial direction of the aged pipe 1 with the pulling force. Force can be offset by the traction reaction force.
Are prevented from coming out of the reaching shaft 2.

FIG. 4 shows another traction means in the reaching shaft 2. As shown in the drawing, the reaction force receiving plate 6 is formed so as to expand in the outer peripheral direction thereof, and the pipe end portion of the aged pipe 1 is formed. 1
Fix to a. Then, the fixed pulleys 13 and 14 are fixed to the reaction force receiving plate 6 via the shafts 11 and 12, and
A movable pulley 15 is provided between the fixed pulleys 13 and 14, and the end portion of the traction member 4 is connected to the movable pulley 15.
Further, a winch 16 is arranged on the ground near the reaching shaft 2, a winch wire 17 is laid over the fixed pulley 13, a movable pulley 15, and a fixed pulley 14 in this order, and the end of the winch wire 17 is fixed to the reaction force receiving plate 6. .

When the winch 16 is driven in this state, for example, the force required to pull in the pipe splitter 5 and the PE pipe 8 is W, and when the traction force of the winch 16 is P, the double booster mechanism by the pulley is used. Since 2P = W, it becomes possible to pull the winch 16 with half the force as compared with the above-described pulling mechanism, and the winch 16 can be downsized. Further, since the traction reaction force of the traction force of the winch 16 acts on the reaction force receiving plate 6 from the fixed pulleys 13 and 14 via the shafts 11 and 12, as a result, the traction reaction force is the same as the traction mechanism described above. It acts on the pipe end portion 1a of No. 1 and prevents the aging pipe 1 from coming out due to pulling.

[0016]

As described above, in the replacement pipe replacement method according to the present invention, the pulling reaction force generated when pulling the breaking member acts on the pipe end of the aged pipe facing the first shaft. Since the force applied in the axial direction of the aged pipe due to the traction force can be offset by the traction reaction force and the aged pipe is prevented from coming out into the first shaft, the first shaft and the second shaft
It is possible to rupture and expand the old pipe laid between the vertical shaft and the new pipe for replacement inside the old pipe.

[Brief description of drawings]

FIG. 1 is a schematic view showing a replacement pipe replacement method of the present invention.

FIG. 2 is an explanatory diagram of a pipe splitter.

FIG. 3 is an explanatory diagram of a towing structure.

FIG. 4 is an explanatory view of a reaction force receiving member.

FIG. 5 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Aged pipe 1a Pipe end 2 Reaching shaft 2a Mountain clasp 3 Starting vertical shaft 3a Mountain clasp 4 Traction member 5 Pipe splitter 51 Screw hole 52 Guide roller 53 Wheel cutter 54 Expander 54a Pin 55 Connection jig 6 Reaction force receiving plate 6a Groove 60 Circular plate 61 Cylinder 62 Abutment 7 Traction device 71 Guide shaft 72 Sliding member 73 Hydraulic cylinder 8 PE pipe 81 Towing head 11 Shaft 12 Shaft 13 Fixed pulley 14 Fixed pulley 15 Movable pulley 16 winch 17 Winch wire

Claims (1)

[Claims] 1. A first vertical shaft and a second vertical shaft for work are provided on the path of an existing pipeline buried in the ground, and an aged pipe laid between the compatible shafts is broken and expanded. In the non-open cutting replacement method of the renewal pipe for drawing the new pipe into the aged pipe, the traction member is inserted from the side of the first shaft into the pipe of the aged pipe so that the end of the traction member reaches the side of the second shaft, A pipe breaking member that splits an aged pipe in the pipe axial direction and expands the diameter is connected to the end of the traction member on the vertical shaft side, and a new pipe for renewal is connected in series to the latter stage of the pipe breaking member. In the state, when the pulling member is pulled by the pulling means installed on the side of the first shaft to pull the pipe breaking member and the new pipe for renewal from the side of the second shaft into the pipe of the aged pipe, the pulling force causes the pulling member. The pulling reaction force acts on the pipe end of the aged pipe facing the first shaft. Replacement method of updating tube characterized by being urchin traction configuration.