JP3093937B2 - Pipe laying method - Google Patents

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 underground.

[0002]

2. Description of the Related Art For example, when laying a closed conduit for sending high-pressure gas in the ground, a trench (buried groove) is excavated along a laying route so that the ground on both sides of the trench is not collapsed. A method is adopted in which a pile is erected, a sheet pile, an upright, and a cutting beam are used in many cases, and the pipes are laid one after another in the trench, and the end faces of the pipes are welded to each other. After the pipes are laid in the trenches, the sheet piles, bulges, cut beams, etc. used for the mountain retaining are removed, and the trenches are backfilled.

As another method, a so-called propulsion method is employed in which a predetermined shaft is excavated instead of excavating a torrent along a laying route, and a pipe is propelled from a lateral wall of the shaft in the longitudinal direction thereof. Sometimes.

[0004]

However, in the method of excavating a trench along a laying route, it takes time to take measures to prevent collapse of the ground, and even after the treatment, it is necessary to hang the pipe in the trench. There is a problem that the progress of the plumbing work is obstructed and a long construction period is required, for example, the cut beam becomes an obstacle and the cut beam needs to be once removed.

The propulsion method is a method of digging underground from the side wall of a shaft, and has the advantage of laying a pipeline without obstructing the traffic on the ground and the flow of the river, but has the advantages of the construction period and cost. Therefore, compared with the method of excavating a trench, there is a problem that an extremely long construction period is required and a huge cost is required. In view of the above circumstances, an object of the present invention is to provide a pipe laying method capable of laying a pipe in a short period of time and at low cost.

[0006]

In order to achieve the above object, a pipe laying method according to the present invention comprises the steps of: excavating a buried trench, standing up at a distance corresponding to the width of the buried trench; A support consisting of a beam connecting two pillars at the top is inserted into the buried trench at predetermined intervals in the longitudinal direction of the buried trench, and a plurality of supports installed in the buried trench are inserted. Straddling, the traveling beam for the hoist crane is bridged over these multiple beams of the shoring,
The buried pipes are transported into the buried trenches using a hoist crane to connect the buried pipes.

Here, the pipe laying method of the present invention preferably includes a step of bridging an earth retaining sheet pile between the support works inserted adjacent to the buried trench. As the shoring, an inverted U-shaped shoring in which the shoring beams are convexly curved upward may be used, or as the shoring, a portal type shoring in which the shoring beams are horizontal. May be used.

Further, in the pipe laying method of the present invention,
It is preferable that the method further includes a step of laying a work floor plate on the trench.

[0009]

According to the pipe laying method of the present invention, after the trench is excavated, a retaining structure such as an inverted U-shape or a portal type for earth retaining is sequentially inserted at an appropriate pitch, so that it is easily broken such as sand. When excavating soil or excavating deep trenches of 2m or more, it is sufficient to bridge a sheet pile for retaining between adjacent supports as necessary, making construction for retaining the soil extremely simple. It can be carried out. In addition, when hanging down the pipe, the traveling beam for the hoist crane should be passed to the support beam for retaining the earth, and the pipe can be loaded into the trench from the end of the trench by the hoist claim, and the pipes should be centered. Can also be easily done. After the pipes are laid, the shoring is removed and collected, and is diverted to the next site.

[0010]

Embodiments of the present invention will be described below. FIG. 1 is a schematic view showing a state in which plumbing is being performed by employing one embodiment of the pipeline laying method of the present invention, and FIG. 2 is a perspective view of a shoring. The trench 20 for burying pipes is excavated using the backhoe 10, and an inverted U-shaped support 30 is inserted into the soil in the trench 20 at a predetermined pitch (50 cm pitch in this embodiment).

As shown in FIG. 2, the support 30 has an H-shaped cross section, and has a size of 150 mm × 150 mm.
mm to 2000 mm. A horizontal sheet pile 34 for earth retaining is laid between the adjacent supports. In FIG. 2, the horizontal sheet pile 34 is stretched only on one side, but this horizontal sheet pile 34 is
Is generally stretched along both side walls of the trench 20. Conditions for bridging the horizontal sheet pile 34 are, for example, in the case of soil having a large collapsibility such as sand, or in the case where the excavation depth is as deep as 2 m or more. When it is necessary to hang the horizontal sheet pile 34 around the support 30, it is natural to use the support 30 having an insertion hole for inserting the horizontal sheet pile 34.

FIG. 3 is a schematic view showing a state in which the burial pipe is hung by a hoist crane. After the shoring 30 is inserted into the trench 20 at a predetermined pitch, a traveling beam 42 for a hoist crane is stretched over the beam 32 of the shoring 30 along the longitudinal direction of the trench 20, and the buried pipe 50 is inserted into the hoist crane 40. Is suspended and transported in the trench 20 to a position where the tip of the burying pipe 50 abuts on the rear end of the pipe 50A (see FIG. 1) connected to the rearmost of the pipes already connected. Then, these pipe ends are aligned with each other. Since the tube 50 is hung by the hoist crane, the position thereof can be easily adjusted. After that, welding of those pipe ends, welding inspection,
Perform coating of the weld. By repeating this, the trench 20
We install pipe connected inside.

FIG. 4 is a schematic view showing a state in which a work floor plate is laid on the trench and work is being performed thereon.
As shown in FIG. 4, the work floor plate 70
Is laid, and the buried pipes 50 are welded to each other on the work floor plate 70, welding inspection is performed, and further, coating and coating of the welded portions are performed, and these operations are performed with a pipe of a predetermined length (for example, 50 m).
After the completion, the work floor plate 70 on the trench 20 is removed, and a pipe of a predetermined length (for example, 50 m) is suspended in the excavation trench 20 at once.

FIG. 5 is a schematic diagram showing a state in which the pipe 50 is installed in the trench 20. Floor sand 60 is spread on the bottom of the trench 20, and the pipe 50 is arranged thereon.
Thereafter, the shoring 50 is removed, and the trench 20 is backfilled. The removed shoring 50 is diverted to the next section.

FIG. 6 is a schematic perspective view showing one end of the trench 20. Here, a gate-type shoring 30A is used, but the shoring according to the present invention may be any shoring comprising two pillars and a beam connecting the two pillars at the top. , May be inverted U-shaped or gate-shaped. In FIG. 6, the support 30 is also provided at the rear end of the trench 20 at a position gradually inclined from the ground into the trench 20.
A is installed. When the shoring 30A is installed in this manner and a traveling beam (not shown in FIG. 6) for the hoist crane is bridged over the beam 32A of the shoring 30A, the pipe buried in the trench 20 is connected to the hoist crane. The hanging work can be performed on the ground, and the work efficiency can be improved.

[0016]

As described above, according to the present invention, the inverse U
Since the sill-shaped or gate-shaped shoring is inserted into the trench for earth retaining, workability of the earth retaining is improved. Moreover, since the traveling beam for the hoist crane is bridged using the beam of the support, the installation of the hoist crane is easy, and the hoist crane is used to easily transport, position, and weld the buried pipe. Can be.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a state in which piping work is performed by employing an embodiment of a pipeline laying method of the present invention.

FIG. 2 is a perspective view of a shoring.

FIG. 3 is a schematic view showing a state in which a burial pipe is hung by a hoist crane.

FIG. 4 is a schematic diagram showing a state in which a work floor plate is laid on a trench and work is being performed thereon.

FIG. 5 is a schematic view showing a state where a pipe is installed in a trench.

FIG. 6 is a schematic perspective view showing a rear end portion of the trench.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Backhoe 20 Trench 30, 30A Shoring 32, 32A Shoring beam 34 Horizontal sheet pile 40 Hoist crane 42 Hoist crane beam 50 Buried pipe 70 Working floor board

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-83883 (JP, A) JP-A-2-24483 (JP, A) JP-A-55-14319 (JP, A) (58) Investigation Field (Int.Cl. ⁷ , DB name) F16L 1/024

Claims (5)

(57) [Claims] An excavating trench for burying, a support comprising two pillars rising up at an interval corresponding to the width of the trench for burying and a beam connecting the two pillars at the top, The hoist crane is inserted into the buried trench at predetermined intervals in the longitudinal direction of the buried trench, and straddles a plurality of the supports installed in the buried trench. A method of laying a pipeline, comprising: bridging a running beam for transportation, transporting the buried pipe into the buried trench by using a hoist crane, and connecting the buried pipes. 2. The method of laying a pipeline according to claim 1, further comprising a step of bridging an earth retaining sheet pile between the supports inserted adjacent to the buried trench. 3. The pipe laying method according to claim 1 or 2, wherein an inverted U-shaped support in which a beam of the support is curved upward and convex is used as the support. 4. The shoring structure according to claim 1 or 2, wherein the shoring structure uses a horizontal gate-type shoring structure.
The pipe laying method described. 5. The method according to claim 1, further comprising a step of laying a work floor plate on the trench.