JPH0333583A - How to lay underground pipes - Google Patents

Abstract

PURPOSE:To reduce the quantity of the earth to be refilled and lighten the tamping work of the refilled earth by laying a buried pipe in a drilled ditch through a spacer, filling foaming resin bulk material into the ditch and backfilling the upper part of the ditch with the earth to be refilled. CONSTITUTION:A ditch is drilled, and a buried pipe 3 is laid in the ditch through a spacer 2. Forming resin bulk material 4 is filled into the ditch 1, and the upper part of the ditch 1 is backfilled with the earth to be refilled 5. With the filling of the forming resin bulk material 4 around the buried pipe 3 laid in the ditch 1, the quantity of the earth to be refilled 5 can be reduced in large degree, and the tamping of the refilled earth is needed only for the refilled earth backfilled lastly. Moreover, as the foaming resin bulk material 4 has a cushioning characteristic and light weight, the strength of the buried pipe 3 can be reduced by that part. The bulk material 4 can be dug up easily at the time of digging up the refilled earth 5 for the repair of the buried pipe 3 and the like, so that the buried pipe 3 can be prevented from being damaged by a drilling machine and the like.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method of laying a buried pipe.

[Conventional Technique #i] Conventionally, when laying underground pipes such as water pipes and gas pipes,
As shown in the figure, first dig a strawberry 1, then dig a trench],
Add 2A of backfill soil to the bottom of the tank and tamp it down. Next, the buried pipe 3 is laid on the backfilling soil 2A, and the backfilling soil 2B is put in the upper part of the buried pipe 3, and this is tamped.

[Problems to be Solved by the Invention] However, the above-mentioned conventional method for laying underground pipes,
It had the following problems.

(1) The soil after trench 1 is excavated is not used as backfill soil 2A, 2B, and mountain sand is normally used as backfill soil 2A, 2B, but in recent years, securing this mountain sand has become increasingly difficult. Have difficulty.

(2) It takes time and effort to compact backfill soil, and if the compaction is not uniform, there is a risk that bending force will be applied to the buried pipe 3 due to the ground quality, causing damage to the buried pipe 3. There is.

(3) Since earth loads and vehicle loads directly act on the buried pipe 3, it is necessary to use a high-strength one as the buried pipe 3.

(4) When digging up the backfilling soil 2B during repair of the buried pipe 3, etc., the buried pipe 3 may be accidentally damaged.

Therefore, an object of the present invention is to provide a buried pipe that requires only a small amount of backfill soil, requires only a small amount of compaction work for the backfill soil, and that reduces the risk of accidentally damaging buried pipes when digging up the backfill soil. The purpose of this invention is to provide a method for laying pipes.

[Means for Solving the Problems] This invention involves excavating a trench, then laying a buried pipe in the trench via a spacer, and then filling the trench with foamed resin powder, The present invention is characterized in that the upper part of the groove is backfilled with backfilling soil.

Next, an embodiment of the method for laying a buried pipe according to the present invention is as follows.
This will be explained with reference to the drawings.

FIG. 1 is a sectional view showing one embodiment of the buried pipe laying method of the present invention.

As shown in FIG. 1, this invention first excavates a groove 1, then lays a buried pipe 3 in the groove via a spacer 2, and then fills the groove 1 with foamed resin powder 4. 3. Then, finally, the upper part of the trench 1 is backfilled with backfilling soil 5.

) By filling the area around the buried pipe 3 laid in the pipe 1 with foamed resin powder 4, the amount of backfilling soil can be significantly reduced, and the tamping of the backfilling soil can be done at the end. Only 5 soils are required,
Since the foamed resin powder 4 has cushioning properties and is lightweight,
The strength of the buried pipe 3 can be reduced accordingly, and furthermore, the strength of the buried pipe 3 can be reduced.
When digging up the backfill soil 5 during repairs, etc., the foamed resin powder 4 can be easily dug up.
There is little risk that the buried pipe 4 will be damaged by an excavator or the like.

The particle size of the foamed resin powder 4 is from 0.5+nm to 3.0m.
It is preferably within the range of .

[Effect of the Invention 1 As explained above, according to the present invention, part of the backfilling soil is replaced with foamed resin powder.

The following useful effects are brought about:

(1) By significantly reducing the amount of backfilling soil, securing mountain sand for backfilling and compacting work will be reduced.

(2) Since the droop on the buried pipe is reduced, a lower-strength buried pipe can be used accordingly.

(3) There is less risk of damaging the buried pipe when backfilling soil is dug up when repairing the buried pipe.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the buried pipe laying method of the present invention, and FIG. 2 is a sectional view showing a conventional buried pipe laying method. In the drawings, 1... groove;
2... Spacer 3... Buried pipe, 4...
- Foamed resin powder, 5... backfill soil.

Claims (1)

[Claims] 1. Excavating a trench, then laying a buried pipe in the trench via a spacer, filling the trench with foamed resin powder, and backfilling the upper part of the trench with backfilling soil. A method for laying underground pipes, characterized by the following.