JPH108445A - Laying method for piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively and safely lay piping under the ground in a short construction period by driving a steel sheet pile inside a trench to hold it through a U-shaped timbering, and after a steel pipe is arranged in a trench and weldedly joined, recovering the timbering to remove the steel sheet pile. SOLUTION: A trench is excavated by heavy machinery, and a light steel sheet pile 2 is driven in both the walls of the trench 1 as an earth retaining wall. Next, a U-shaped steel timbering is severally arranged at prescribed pitches inside the light steel sheet pile 2, and a wooden wedge 33 is properly driven in a gap between a pushing plate 32 and a sheet pile wall. Next a steel pipe 4 is suspended down in the trench 1 and aligned, and after facing, welded and paintedly covered. Then the U-shaped timbering 3 and the earth retaining light steel sheet pile 2 are removed and back-filled with back filling earth 5 to finish the laying of piping. Thus a shore strut and a wale are unnecessary, and since the strut crossing the trench does not exist at the time of hanging down a steel pipe 4, it can be suspended down without any hindrance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

2. Description of the Related Art In a general open-cutting method for laying a pipeline in the ground, a trench (buried groove) is excavated along a pipe laying route, and a sheet pile is trenched so that the ground on both sides of the trench does not collapse. Standing on the side of the side wall, ridges (cross beams) for holding the sheet pile are placed on the surface of the sheet pile, and a number of cut beams that stretch the ridges on both side walls are used to secure the mountain, and then piped sequentially in the trench Then, the pipes were welded end-to-end and laid, and when these were completed, steps were taken such as removing the sheet piles, bulges, cutting beams, etc. used for the mountain retaining while backfilling the trench. .

[0003]

However, not only does it take time to install a sheet pile, a bulge, and a girder for mountain retaining, but also when the pipe is suspended in the trench, it is mounted so as to cross the trench. The cut beam becomes an obstacle, and a reworking operation in which the cut beam must be once removed occurs, or a complicated operation such as setting a pipe while passing under the cut beam from an oblique direction is involved. It has been pointed out that such a construction method has room for improvement.

[0004] An apparatus using a hydraulic jack as a cutting beam is disclosed in Japanese Patent Publication No. 63-10250, but this case also has the same problem as described above. The present invention has been made in view of the above circumstances, and has as its object to provide a method of laying a pipeline that can lay the pipeline safely and inexpensively in a short period of time.

[0005]

According to the present invention, a trench is excavated, steel sheet piles are sequentially driven into the two walls of the trench while connecting claws, and a steel U-shaped support is arranged on the inner surface of the steel sheet pile. Laying pipes, fixing steel sheet piles, piping steel pipes in trenches, tilting U-shaped supports in the longitudinal direction of steel pipes, collecting supports and recovering sheet piles, and performing backfilling. Is the way. In the present invention, a sheet pile wall material is hung down on both sides of the excavated trench, and the sheet piles are driven together while connecting the claw portions along the trench. A steel U-shaped support is installed in the trench at an appropriate pitch in the trench extension direction such that the U-shaped opening is on the top. In this state, the steel pipe is suspended in the trench, and a series of joining operations such as centering and welding are performed. After that, the U-shaped support and the sheet pile are sequentially and efficiently collected in line with the backfill. By repeating the above steps, the pipe laying can be performed efficiently.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 2, as a steel U-shaped support 3, an H-shaped steel 150 × 150 is used and bent into a U-shape substantially equal to the width and depth of the trench,
A holding plate 32 was attached to both lateral surfaces of the rising portion of the U-shaped 31. The holding plate 32 is used for driving and fixing a wedge 33 or the like between the holding plate and the sheet pile in order to press the U-shaped support 3 against the sheet pile surface on both side walls in the trench. For example, as shown in FIG.
It is preferable to attach a strip-shaped pressing plate 32 having a width of about 100 to 150 mm laterally to the outer surface of the U-shaped rising portion.

FIG. 1 is a perspective view of an embodiment. In a trench 1 having a width of about 2 m and a depth of about 3 m, steel sheet piles 2, 2 are arranged on both walls thereof, and a steel U-shaped support 3 holds the steel sheet piles 2, 2. The steel sheet piles 2 are arranged such that adjacent steel sheet piles connect the claw portions. In this example, a lightweight steel sheet pile 2 is used as a sheet pile for the sheet pile, and the U-shaped support 3 is made of 1.
It was installed at a 5M pitch. In the trench 1, a diameter of 50
A state in which a pipe 4 of about 0 mm is provided is shown.

The working procedure of the method of the present invention is as follows. (A) As shown in FIG. 3, the trench 1 is excavated by a heavy equipment (for example, the backhoe 11). 3A is a side view, and is a view as viewed from an arrow A in FIG. 3B, and FIG. 3B is a sectional view as viewed from an arrow B in FIG. 3A. (B) As shown in FIG. 4, the lightweight steel sheet pile 2 is sequentially driven into both side walls of the trench 1 as a retaining wall. FIG. 4A is a side view showing a view taken in the direction of arrow C in FIG. 4B. FIG. 4B is a sectional view. (C) Subsequently, the steel U-shaped support 3 is disposed inside the lightweight steel sheet pile 2 at a predetermined pitch, and a wooden wedge 33 (see FIG. 1) is appropriately driven into the gap between the holding plate 32 and the sheet pile wall. . FIG.
(A) is a side view showing this step, and is a view as seen from an arrow D in FIG. 5 (b). FIG. 5B is a sectional view. (D) After the steel pipe 4 is suspended in the trench by the truck crane 12 and the like, and the centering and the skin matching are performed,
Welding and painting are applied (Fig. 6). (E) As shown in FIG. 7, the work of removing the U-shaped support 3 and the lightweight sheet pile 2 for retaining the soil is performed, the backfill is performed with the backfill soil 5, and the pipe installation is completed. The setup for removing the U-shaped support 3 is as follows. That is, the wedge 33 is removed, and the U-shaped support 3 is lowered in the pipe length direction. Next, steel pipe 4
While passing under the ground, lift it with heavy equipment from the gap between the retaining wall and the pipe, and carry it to the ground surface.

[0009]

As described above, according to the present invention, there is no need for a cutting beam or a belly. Therefore, even when the steel pipe is hung in the trench, it can be hung without any trouble because there is no cut beam crossing the trench.
Since the sheet pile walls or the sheet pile and the U-shaped support are merely assembled while maintaining a simple contact state, assembly and disassembly are easy. Furthermore, since high-efficiency work becomes possible, it is possible to expect an effect of shortening the construction period and reducing costs.

[Brief description of the drawings]

FIG. 1 is a perspective view of an embodiment.

FIG. 2 is a perspective view of a U-shaped support.

FIGS. 3A and 3B are process diagrams of the embodiment, in which FIG. 3A is a side view and FIG.

4A and 4B are process diagrams of the embodiment, in which FIG. 4A is a side view, and FIG.

FIGS. 5A and 5B are process diagrams of the embodiment, in which FIG. 5A is a side view and FIG.

6 (a) is a side view, and FIG. 6 (b) is a cross-sectional view.

FIGS. 7A and 7B are process diagrams of the embodiment, in which FIG. 7A is a side view and FIG.

[Explanation of symbols]

 Reference Signs List 1 trench 2 steel sheet pile 3 U-shaped support 4 steel pipe 5 backfill soil 11 backhoe 12 truck crane 31 U-shaped steel 32 holding plate 33 wedge

Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display F16L 1/024

Claims (1)

[Claims] 1. A trench is excavated, steel sheet piles are sequentially driven into both walls of the trench, and a steel U-shaped support is disposed on an inner surface of the steel sheet pile to fix the steel sheet pile, and a steel pipe is piped into the trench. A method of laying a pipeline, comprising: tilting a U-shaped support in the longitudinal direction of a steel pipe, collecting the support and steel sheet pile, and performing backfilling.