JPH11182737A - Pipe burying construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent floating of a pipe caused by placing fluidized earth in a ditch, with excellent workability in a pipe burying construction method adopted to gas conduit burying work or the like. SOLUTION: A cord member 60 with both ends fitted to a fixed member buried in fluidized earth and fixed in the fluidized earth by solidification of the fluidized earth is installed in such a way as to pass the upper part of a pipe 20 laid in a ditch 10. Fluidized earth is backfilled into the buried depth of the fixed member 61 at a deeper part than the laid depth of the pipe 20 in the ditch 10 where the pipe 20 is laid, and after the fixed member 61 is fixed in the fluidized earth by solidification of the backfilled fluidized earth, the fluidized earth is backfilled into a part shallower than the laid depth of the pipe 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe burying method employed, for example, for burying gas pipes.

[0002]

2. Description of the Related Art In laying gas pipes, when laying gas pipes in excavated trenches and refilling the trenches in which the gas pipes are laid, recycling of excavated soil and the lower part of the laid gas pipes. One of the methods for preventing the settlement of the ground surface after backfilling by filling the space sufficiently without gaps is a method of backfilling the grooves with “fluidized treated soil”.

[0003] Here, the term "fluidized treated soil" refers to treated soil which is made into a liquid or slurry by mixing soil and sand with a solidifying agent such as water and cement, and is usually laid because its viscosity is sufficiently low. The gap below the pipe can be filled, and since it contains a solidifying agent, it hardens to such a degree that it can be opened for traffic in about half a day after mixing.

[0004]

However, even if the pipe is newly laid in the trench, or even if it is an existing pipe exposed in the excavation trench, immediately after casting the fluidized soil into the trench, Since the fluidized soil is liquid, it tends to float upward due to buoyancy. FIG. 2 is a cross-sectional view of a groove showing an example of a conventional method for preventing lifting.

In order to prevent the above-mentioned floating,
Conventionally, a square member 40 is arranged between the pipe 20 laid in the groove 10 and the cross beam 30, so that the rising is suppressed. However, such a treatment method has problems that the workability is poor, a great deal of labor is required for workers, and a long construction period is required. The present invention has been made in view of the above circumstances, and has as its object to provide a pipe burying method which has a method of preventing lifting with good workability.

[0006]

A pipe burying method according to the present invention for achieving the above object is a pipe burying method for burying a pipe by backfilling a groove excavated and having a pipe laid therein with fluidized soil. A portion of the groove in which the pipe is laid, which is deeper than the laying depth of the pipe, is backfilled with the fluidized soil to fix the pipe to the fluidized soil, and thereafter, the pipe in the groove is It is characterized in that it is backfilled with fluidized soil to a portion shallower than the laying depth.

According to the pipe burying method of the present invention, a portion deeper than the laying depth of the pipe in the groove is backfilled with the fluidized soil and the pipe is fixed to the backfilled fluidized soil. If this is done, the pipe is pulled from below so that the pipe does not rise when it is backfilled with fluidized soil to the upper part of the pipe, which simplifies construction and contributes to shortening the construction period.

[0008] More specifically, the pipe burying method of the present invention is, for example, a fixing member which is buried in fluidized soil and fixed in the fluidized soil by solidification of the fluidized soil. Are installed such that the central part of the string-like member passes over the top of the pipe laid in the groove, and the pipe is laid in the groove where the pipe is laid. A portion deeper than the depth, backfilled with the fluidized soil to a depth at which the fixed member is buried, and after the fixed member is fixed in the fluidized soil by solidification of the backfilled fluidized soil, the groove is formed. Of these, it is preferable to backfill the fluidized soil to a portion shallower than the installation depth of the pipe.

The pipe burying method of the present invention does not limit the specific fixing method to the fluidized soil poured into a portion deeper than the pipe to a specific fixing method.
The fixing member is buried in the fluidized soil and the method of using the fixed member fixed to the fluidized soil by solidification of the fluidized soil is simple, so that the workability can be further improved and the construction period can be further improved. Shortening is achieved.

[0010]

Embodiments of the present invention will be described below. FIG. 1 is a cross-sectional view of a groove showing one embodiment of the pipe burying method of the present invention. Here, first, the fluidized soil 51 is cast at the bottom of the groove 10 in which the pipe 20 is laid. Next, the string-shaped member 60, specifically, a string, a chain, a rope, or the like is laid across the upper part of the pipe 20, and both ends of the string-shaped member 60 are fixed to the fixed member having a specific gravity larger than that of the fluidized soil. Attach to 61. This fixing member 6
1 may be, for example, an iron disk or the like or a combination of rebars in a plate shape, which is buried in fluidized soil and becomes fluidized when the fluidized soil is solidified. Any shape and material may be used as long as the shape and material do not easily come out of the treated soil. The fixing member 61 may be attached to the string-shaped member 60 before or after the string-shaped member 60 is laid over the pipe 20. Depending on the dimensions of the groove 10 and the pipe 20, the groove 10 If you have enough space to work inside,
After the cast fluidized soil 51 is solidified, the fixing member 61
Is preferably placed on the solidified fluidized soil 51, the string-like member 60 is hung over the pipe 20, and then the fixing members 61 are attached to both ends of the string-like member 60 from the viewpoint of workability.

As described above, after the string-like member having both ends attached to the fixing member 61 is installed so as to pass through the upper part of the pipe 20 laid in the groove 10, the string-like member is placed in the groove 10. The fluidized soil 52 is backfilled to a depth deeper than the installation depth of the pipe 20 and to a depth where the fixing member 61 is buried, and the fixed member 61 is fluidized by solidification of the backfilled fluidized soil 52. After being fixed in the treated soil 52, the fluidized soil 53 is backfilled to a portion in the groove 10 which is shallower than the installation depth of the pipe 20. At this time, since the fixing member 61 is already fixed in the solidified fluidized soil 52, even if buoyancy acts on the pipe 20, lifting of the pipe 20 due to the buoyancy is prevented.

[0012]

As described above, according to the pipe burying method of the present invention, the floating of the pipe due to the buoyancy acting on the pipe due to the casting of the fluidized soil is easily and reliably prevented. Shortening is also possible.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a groove showing an embodiment of a pipe burying method according to the present invention.

FIG. 2 is a cross-sectional view of a groove showing an example of a conventional method for preventing lifting.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Groove 20 Pipe 30 Cross beam 40 Square bar 50, 51, 52, 53 Fluidized soil 60 String-shaped member 61 Fixing member

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Abe 4-13-21 Nakameguro Meguro-ku Urban Heights A-1210 Nakameguro A-1210 (72) Inventor Minoru 2-10-9 Izumi Suginami-ku

Claims (2)

[Claims] 1. A pipe burying method for burying a pipe by burying a pipe in which a pipe is laid by excavating and burying the pipe with fluidized soil, wherein the depth of the pipe in the groove in which the pipe is laid is less than the depth of the pipe. Backfilling the deep portion with the fluidized soil to fix the pipe to the fluidized soil, and then backfilling the trench with the fluidized soil to a portion shallower than the pipe laying depth. Characteristic pipe burial method. 2. A string member having both ends attached to a fixing member embedded in the fluidized soil and fixed in the fluidized soil by solidification of the fluidized soil, a central portion of the string member. Is installed so as to pass through the upper part of the pipe laid in the groove, and flows into the groove in which the pipe is laid, which is deeper than the laying depth of the pipe, to a depth where the fixing member is buried. After the fixing member is fixed in the fluidized treated soil by solidification of the backfilled fluidized treated soil, the fluidized fluidized soil is fluidized to a portion of the groove that is shallower than the pipe laying depth. 2. The pipe burying method according to claim 1, wherein the pipe is buried with treated soil.