JPH08121650A - Pipeline laying construction method - Google Patents

Abstract

PURPOSE: To allow a pipeline to be laid at a low cost and in a short construction period by inserting inverted U-shape or portal timbering in a trench to perform earth retaining, laying a travel beam for a hoist crane across plural timbering, and transporting a buried pipe into the trench using the hoist crane to connect the buried pipe. CONSTITUTION: At the time of laying a pipeline, a trench 20 for burying a pipe is excavated using a back hoe, and timbering 30 of inverted U-shape are inserted at the specified pitch in the earth in the trench 20. Earth retaining lateral sheet piles 34 are then laid across the adjacent timbering 30, and a travel beam 42 for a hoist crane is laid across the beams 32 of the timbering 30, along the longitudinal direction of the trench 20. A buried pipe 50 is hung from the hoist crane 40, transported in the trench 20, brought into contact with the rear end of an already connected pipe, and after the mutual alignment of the pipe ends, the mutual welding of the pipe ends, welding inspection and the coating of welded parts are performed. The above-mentioned process is repeated to install the pipeline.

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 so that the ground on both sides of the trench is not collapsed. 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, instead of excavating the Torens along the laying route, a predetermined vertical shaft is excavated and the pipe is propelled from the lateral wall of the vertical shaft in the longitudinal direction thereof. Sometimes.

[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 procedure, the pipe is suspended in the trench. There is a problem that the cutting beam is an obstacle, and it is necessary to remove the cutting beam once, which hinders the smooth progress of the piping work and requires a long construction period.

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 hindering traffic on the ground or the flow of a river, the construction period and cost are low. 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 which achieves the above object is to excavate a burying trench and to raise two pillars which rise at intervals corresponding to the lateral width of the burying trench. Supports consisting of beams connecting two pillars at the top are inserted into the trench for burying at predetermined intervals in the longitudinal direction of the trench for burying, and a plurality of supports installed in the trench for burying Across the beams of the multiple support works, cross the traveling beams for the hoist crane,
It is characterized in that the burying pipe is transported to the burying trench by using a hoist crane to connect the burying pipes.

Here, it is preferable that the pipeline laying method of the present invention has a step of bridging the earth retaining sheet pile between the support works inserted adjacently in the burying trench. As the above-mentioned support work, an inverted U-shaped support work in which the beam of the support work is convexly curved upward may be used, or as the above-mentioned support work, a gate-type support work in which the beam of the support work is horizontal is used. You may use.

Further, in the pipe laying method of the present invention,
It is also preferable to have a step of laying a work floor board on the trench.

[0009]

According to the pipe laying method of the present invention, after excavating a trench, shovels for retaining soil, for example, inverted U-shape, gate-type, etc., are sequentially inserted at an appropriate pitch, so that it is easy to collapse like sand. When excavating earthy soil or excavating deep trenches of 2 m or more, it is sufficient to bridge the sheet piles for earth retaining between adjacent support works as necessary, and the work for retaining earth is extremely simple. It can be carried out. In addition, when hoisting down the pipe, the traveling beam for the hoist crane may be passed over the beam for supporting the earth and the pipe body may be brought into the trench from the trench end using the hoist claim. Can be done easily. After laying the pipe, the supporting work is extracted 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 piping work is carried out by adopting an embodiment of the pipeline laying method according to the present invention, and FIG. 2 is a perspective view of the support work. The pipe burying trench 20 is excavated using the backhoe 10, and the inverted U-shaped support structure 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 supporting structure 30 has an H-shaped cross section and has a size of 150 mm × 150 mm. The rooting length is 500 depending on the bearing capacity of the soil.
mm to 2000 mm. A horizontal sheet pile 34 for earth retaining is hung between adjacent support works. In FIG. 2, the horizontal sheet pile 34 is laid on only one side, but the horizontal sheet pile 34 is
Are generally spanned along both side walls of the trench 20. The conditions for crossing the horizontal sheet pile 34 are, for example, the case of a highly collapsible soil such as sandy ground, and the case of a deep excavation depth of 2 m or more. In addition, when it is necessary to bridge the horizontal sheet pile 34 on the supporting bar 30, it is natural to use the supporting bar 30 having an insertion port for inserting the horizontal sheet pile 34.

FIG. 3 is a schematic view showing a state where the burying pipe is suspended by a hoist crane. After inserting the supporting works 30 into the trench 20 at a predetermined pitch, a traveling beam 42 for a hoist crane is stretched over the beam 32 of the supporting work 30 along the longitudinal direction of the trench 20, and the hoist crane 40 is buried with a pipe 50 for embedding. Is suspended, and the inside of the trench 20 is transported to a position where the tip of the embedding pipe 50 comes into contact with the rear end of the pipe 50A (see FIG. 1) connected to the rearmost of the already connected pipes. Then, the tube ends are aligned with each other. Since the pipe 50 is suspended by the hoist crane, the alignment can be easily performed. After that, welding of those pipe ends, welding inspection,
Cover the weld. Repeat this for the trench 20
The pipes connected inside will be installed.

FIG. 4 is a schematic view showing a state in which a work floor board is laid on a trench and work is performed on it.
As shown in FIG. 4, a work floor board 70 is formed on the trench 20.
On the working floor plate 70, the buried pipes 50 are welded to each other, a welding inspection is performed, and coating of the welded portion is further applied, and these works are pipe lines of a predetermined length (for example, 50 m).
It is also possible to dispose the work floor plate 70 on the trench 20 after the completion of the work and to suspend the pipelines of a predetermined length (for example, 50 m) all at once inside the excavation trench 20.

FIG. 5 is a schematic view showing a state where the tube 50 is installed in the trench 20. Floor sand 60 is spread over the bottom of the trench 20, and the pipe 50 is placed thereon.
After that, the support work 50 is removed, and the trench 20 is backfilled. The removed support work 50 will be diverted to the next work area.

FIG. 6 is a schematic perspective view showing one end of the trench 20. Although a gate-shaped support structure 30A is used here, the support structure referred to in the present invention may be any support structure that is composed of two columns and a beam connecting the two columns at the top. The shape may be an inverted U shape or a gate shape. In FIG. 6, the support work 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 support beams 30A are installed in this way and the traveling beams (not shown in FIG. 6) for the hoist crane are bridged over the beams 32A of the support beams 30A, the pipes buried in the trench 20 are transferred to the hoist crane. The hanging work can be done on the ground, which improves the efficiency of the work.

[0016]

As described above, in the present invention, the inverse U
The work of earth retaining is improved because the earth retaining work is done by inserting the letter-shaped or gate-shaped support work into the trench. Moreover, since the traveling beams for the hoist crane are laid over using the beams of the support work, it is easy to install the hoist crane, and the hoist crane can be used to easily transport, align, and weld the buried pipe. You can

[Brief description of drawings]

FIG. 1 is a schematic view showing a state in which piping work is carried out by adopting an embodiment of a pipeline laying method of the present invention.

FIG. 2 is a perspective view of a support work.

FIG. 3 is a schematic diagram showing a state in which the burying pipe is suspended by a hoist crane.

FIG. 4 is a schematic view showing a state in which a work floorboard is laid on a trench and work is performed on it.

FIG. 5 is a schematic view showing a state in which a tube is installed in a trench.

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

[Explanation of symbols]

 10 Backhoe 20 Trench 30,30A Support work 32,32A Beam for support 34 Horizontal sheet pile 40 Hoist crane 42 Beam for hoist crane 50 Buried pipe 70 Working floor board

Claims (5)

[Claims] 1. A support structure comprising two pillars which are excavated from a burial trench and stand up at intervals corresponding to the lateral width of the burial trench, and a beam which connects these two pillars at the top. The hoist crane is inserted into the burying trench at predetermined intervals in the longitudinal direction of the burying trench, straddles the plurality of shorelines installed in the burying trench, and supports the beams of the plurality of shorelines. A pipeline laying method, characterized in that a traveling beam is bridged over, the burying pipe is carried into the burying trench by using a hoist crane, and the burying pipes are connected to each other. 2. The pipeline laying method according to claim 1, further comprising a step of bridging an earth retaining sheet pile between the support works inserted adjacently into the burying trench. 3. The pipeline laying method according to claim 1, wherein an inverted U-shaped support structure in which a beam of the support structure is convexly curved upward is used as the support structure. 4. The gate-type support work in which a beam of the support work is horizontal is used as the support work.
The pipe laying method described. 5. The pipeline laying method according to claim 1, further comprising the step of laying a work floor board on the trench.