JPH08121647A - Pipeline laying construction method - Google Patents

Abstract

PURPOSE: To obviate the earth retaining installation and removal so as to shorten the construction period by a large margin by excavating a burying trench, repeating the process of backfilling the trench after installing shield tubes in the trench successively in the unit of one or plural shield tubes, and then inserting a main pipe in the shield tube. CONSTITUTION: At the time of laying a pipeline, a trench 10 is excavated along a laying path using a back hoe without using the earth retaining sheet piles, and then one or two Hume pipes 12 are installed in the trench 10. Upon installing the Hume pipes 12, the trench is immediately backfilled. The earth retaining is thereby dispensed with, and a construction period is shortened. After burying the Hume pipes 12, shafts 14 are excavated at both ends of the buried Hume pipes 12, and while performing the work of welding, welding inspection and coating of the welded part on one side, a main pipe 16 is led into the Hume pipe 12 using a winch 18 installed at the other end every end of the above-mentioned work. Inside filling is then applied to a gap between the main pipe 16 and the Hume pipe 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipeline laying method for laying a pipeline in the ground.

[0002]

2. Description of the Related Art For example, when laying a closed pipeline for sending high-pressure gas in the ground, a trench (buried groove) is excavated along the laying route to prevent the ground on both sides of the trench from collapsing. In this method, piles are piled up by using piles, sheet piles, upsets, and beams, and then pipes for installation are sequentially arranged in the trenches, and end faces of the pipes are welded to each other. After the pipe is laid in the trench, the sheet pile used for the mountain retaining, the uprising, the cutting beam, etc. are removed, and the trench is backfilled.

As another construction method, a so-called propulsion construction method is adopted in which a predetermined vertical shaft is dug instead of excavating a trench along a laying route and a pipe is propelled from the lateral wall of the vertical shaft in its longitudinal direction. Sometimes. When using a propulsion method to lay a pipeline for sending high-pressure gas, for example, in order to prevent the tube from being damaged or distorted, first, for example, a Hume tube as a sheath tube is propelled and the main (gas Tube) is pulled in or pushed in.

[0004]

However, in the method of excavating the trench along the laying route, it takes time and effort to prevent the ground from collapsing, and even after the treatment, the pipe is placed in the trench. Preventing the smooth progress of plumbing work, such as the need to remove the beam once it becomes an obstacle.
There is a problem that a long construction period is required.

The propulsion method is a method of digging into the ground from the side wall of a vertical shaft, and although it has the advantage of being able to lay a pipeline without preventing traffic on the ground or the flow of rivers, it does not have the construction period or cost. Therefore, compared with the method of excavating the trench, there is a problem that the construction period is extremely long and the cost is huge. In view of the above circumstances, an object of the present invention is to provide a pipeline laying method capable of laying a pipeline at a low cost in a short construction period.

[0006]

The pipe laying method of the present invention for achieving the above object comprises a first step of digging a trench for burial and a second step of installing a sheath pipe in the trench for burial. , The third step of backfilling the burying trench, the sheath tube 1
It is characterized in that it is repeatedly executed in units of a plurality of or a plurality of tubes, and then the main tube is inserted into the sheath tube and the space between the sheath tube and the main tube is filled.

[0007]

The pipe laying method of the present invention serves as an earth retaining after a trench excavation and a role as a shelter to make the work inside the pipe safe, and a sheath pipe for protecting the main pipe is installed and immediately backfilled. . By doing this, restoration can be done on the same day, and traffic interruptions and obstacles can be completed in a short time. In terms of plumbing work, installation work and removal work are not required, so high-efficiency laying and safety work can be realized, and the construction period can be shortened.

[0008]

Embodiments of the present invention will be described below. 1 to 5 are views showing a longitudinal direction and a cross-sectional direction of a trench showing each step of the pipeline laying method of the present invention. First of all,
As shown in Fig. 2, the trench 10 is excavated while the backhoe for excavation is located at the extension of the trench without using the pile retaining sheet pile to prevent landslide, and then the trench is excavated as shown in Fig. 2. One or two fume tubes 12 are installed inside 10. The trench 10 has, for example, a depth of about 2.5.
The fume tube 12 has an inner diameter of 800 mm and a fume tube has a length of 2.43 m. In this example, 20 fume tubes 12 are installed in a trench 10 of 50 m. Fume tube 1
It is sufficient to adjust how many 2 are installed at one time depending on the collapsibility of the soil being excavated, and is not limited to the above 1 or 2. The fume tube 12 has one end that is slightly wider than the other end so that the trench 10
When installing the fume tube 12 in the inside, the wide opening of the fume tube and the narrow end of the next fume tube are inserted into the plug joint system with an O-ring for water stop interposed therebetween. To connect. In this way, 20 fume tubes 12 are sequentially connected.

After placing the fume tube 12 in the trench 10, the trench 10 is immediately backfilled as shown in FIG. This eliminates the need for ridge retaining and significantly reduces the construction period. In addition, traffic can be cut off in a short time because it can be restored immediately. After burying the fume pipe 12, pits 14 are dug at both ends of the buried fume pipe, and the main pipe 16 is welded at one end side, welded, and painted on the welded part, while finishing them. Each time, the winch 18 fixed at the other end is used to draw the winch 18 into the buried fume tube 12. In order to facilitate the insertion of the main pipe 16 into the fume pipe 12, the main pipe 16 is provided with two pipe piping smoothers 2 each made of polyethylene.
Holds 0. The outer shape of the main pipe 16 is, for example, 600
mm.

When the main pipe 16 is installed in the fume pipe 12 in this way, as shown in FIG. 5, the gap between the fume pipe 12 and the main pipe 16 is closed. As the filling material, for example, cement bentonite, cement milk, mortar or the like is used.

[0011]

As described above, according to the present invention, a trench is dug and excavated, and in the trench, it also serves as a soil retainer, a role as a shelter for safe operation in the pipe, and protects the main pipe. Since the sheath pipe is installed and backfilled immediately, it is not necessary to install or remove the mountain cleat, which greatly shortens the construction period.

[Brief description of drawings]

FIG. 1 is a view showing a longitudinal direction and a cross-sectional direction of a trench, showing one step of a pipeline laying method of the present invention.

FIG. 2 is a diagram showing a longitudinal direction and a cross-sectional direction of a trench, showing one step of a pipeline laying method of the present invention.

FIG. 3 is a diagram showing a longitudinal direction and a cross-sectional direction of a trench, showing one step of the conduit laying method of the present invention.

FIG. 4 is a view showing a longitudinal direction and a cross-sectional direction of the trench, showing one step of the conduit laying method of the present invention.

FIG. 5 is a view showing a longitudinal direction and a cross-sectional direction of the trench, showing one step of the pipeline laying method of the present invention.

[Explanation of symbols]

 10 trench 12 fume tube 14 standing 16 main tube 18 winch 20 piping smoother

Claims (1)

[Claims] 1. A sheath tube 1 comprising: a first step of excavating a burial trench by excavation, a second step of installing a sheath tube in the burial trench, and a third step of backfilling the burial trench.
A pipe laying method, characterized in that the main pipe is inserted into the sheath pipe, and the space between the sheath pipe and the main pipe is filled.