JP2776695B2 - Prevention of settlement of buried pipeline by civil engineering sheet - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for preventing settlement of a buried pipeline by a civil engineering sheet.

[0002]

2. Description of the Related Art It has been conventionally known to use a support pile or the like to prevent a pipe line laid underground from unequally sinking after being laid due to the weight of the pipe and the weight of the fluid in the pipe.

[0003]

However, the above-mentioned conventional method using a support pile or the like is not always simple and has a problem that the cost is high.

[0004] It is an object of the present invention to solve such a problem and to make it possible to prevent uneven settlement easily and at low cost by using a civil engineering sheet.

[0005]

In order to achieve the above object, according to the present invention, after a base floor material is put into the bottom of an excavation trench and solidified, a civil engineering sheet is laid on the base floor material, and A pipe is installed on the pipe, and the both sides of the civil engineering sheet are once covered with the pipe, and the lower foundation material is charged to a predetermined height around the pipe to consolidate the ground.
After spreading on the lower foundation material and rising along the both side walls of the excavation groove and temporarily fixing, the upper foundation material is thrown up to the top of the pipe on the civil engineering sheet and the ground is solidified,
The rising portion of the civil engineering sheet is folded back and spread on the upper foundation material, and then the excavation trench is backfilled with the backfill material.

[0006]

In this manner, when the laid pipe tries to sink and pulls the civil engineering sheet downward, the weight of the upper foundation material and the backfill material above the civil engineering sheet causes a gap between the civil engineering sheet and the upper and lower foundation materials. And a frictional force acts between the civil engineering sheet and the backfill material, which hinders the movement of the civil engineering sheet. Thus, the civil engineering sheet supports the pipe and prevents the pipe from sinking.

[0007]

FIG. 1 shows an embodiment of the method of the present invention. First, as shown in FIG. 1 (a), an excavation groove 1 is formed, and a base floor material 2 is put into the bottom thereof to consolidate the ground. The consolidation is performed by an appropriate method such as compaction and compaction. A canvas or the like is used for the civil engineering sheet 3, but one having water permeability is preferable. The reason for this is that the groundwater can penetrate, thereby exerting buoyancy on the pipes 4 and the base materials 5 and 7 to reduce their weight and help prevent ground subsidence. When the ground is good, the civil engineering sheet 3 does not necessarily have to be spread over the entire length of the pipeline, but may be spread, for example, only about half of the length of each pipe 4.

Next, as shown in FIG. 1 (b), a pipe 4 is installed on the upper surface of the civil engineering sheet 3, and both sides of the civil engineering sheet 3 are temporarily covered with the pipe 4, and these both sides are used in the next step. The introduction of the lower base material 5 is not obstructed.

Next, as shown in FIG. 1 (c), the lower foundation material 5 is charged to the center height of the pipe 4 and solidified. In doing so, it is necessary to ensure that the lower foundation material 5 reaches the lower half of the tube 4 sufficiently. Next, civil engineering sheet 3
Are spread on the upper surface of the lower foundation material 5, and are further raised along the side walls 6 of the excavation groove 1 and temporarily fixed.

Finally, as shown in FIG. 1 (d), after the upper foundation material 7 is charged to the top of the pipe 4 to consolidate the ground, the rising portion of the civil engineering sheet 3 is turned back, and the upper surface of the upper foundation material 7 is turned on. Spread out. After that, the excavation trench 1 is backfilled with the backfill material 8 to complete the embedding work of the pipeline.

In the pipe line buried as described above, when the pipe 4 pulls down the civil engineering sheet 3 in order to sink, the weight of the upper foundation material 7 and the backfill material 8 causes
A frictional force acts between the civil engineering sheet 3 and the lower foundation material 5, the upper foundation material 7, and the backfill material 8 sandwiching the civil engineering sheet 3, and the civil engineering sheet 3 resists being dragged downward. Therefore, the civil engineering sheet 3 supports the pipe 4 and prevents the pipe 4 from sinking.

In this embodiment, since the purpose of the present invention is only to prevent the settlement of the pipe 4, when the groundwater level is high and the soil cover of the pipe is small, the pipe 4 rises when the pipe 4 is empty or close to it. There is a risk. Therefore, as another embodiment, FIG. 2 shows a method for preventing both the sinking and the lifting of the pipe 4. In this embodiment, as shown in the figure, another civil sheet 9 is spread on the upper surface of the pipe 4 and the civil sheet 3 in the process shown in FIG.
The both sides of 9 are raised along the side wall 6 and temporarily fixed. Then, in the next step, the rising portions of both the civil engineering sheets 3 and 9 are folded back and spread on the upper surface of the upper foundation material 7, and the excavation groove 1 is backfilled with the backfill material 8. The civil engineering sheet 3 prevents the pipe 4 from sinking as described above, and the civil engineering sheet 9
Prevents the pipe 4 from being lifted up by the action of frictional force as in the case of the civil engineering sheet 3.

[0013]

As described above, according to the present invention, when the buried pipe pulls the civil engineering sheet downward in order to sink, the weight of the upper foundation material and the backfill material causes the civil engineering sheet and the upper and lower parts sandwiching the same. By applying a frictional force between the lower foundation material and between the civil engineering sheet and the backfill material, the civil engineering sheet can be prevented from moving downward, so that the civil engineering sheet can support the lower half of the pipe. , Can prevent the pipe from sinking.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the method of the present invention.

FIG. 2 is a sectional view showing another embodiment of the method of the present invention.

[Explanation of symbols]

 Reference Signs List 1 excavation groove 2 base floor material 3 civil engineering sheet 4 pipe 5 lower foundation material 6 side wall 7 upper foundation material 8 backfill material

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F16L 1/024 E03B 7/00

Claims (1)

(57) [Claims] Claims: 1. A ground material is put into the bottom of a digging trench to solidify the ground, a civil engineering sheet is laid on the ground material, and a pipe is placed on the civil engineering sheet. After covering the pipe and charging the lower foundation material to a predetermined height around the pipe to consolidate, the both sides of the civil engineering sheet are spread on the lower foundation material and rise along the both side walls of the excavation groove. After the upper foundation material is thrown up to the top of the pipe on the civil engineering sheet to consolidate the ground, the rising portion of the civil engineering sheet is folded back and spread on the upper foundation material, and then the excavation groove is filled with the backfill material. A method for preventing settlement of a buried pipeline by a civil engineering sheet, characterized by performing backfilling.