JPH0333585A - How to lay underground pipes - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

[Conventional technology] 1- Conventionally, in order to lay underground pipes such as water pipes and gas pipes, a second
As shown in the figure, first, a trench 1 is dug, and then backfilling soil 2A is poured into the bottom of the trench 1 and tamped. Next, the buried pipe 3 is laid on the backfill soil 2^, and the backfill 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 and 2B, and continuous phase or mountain sand is used as backfill soil 21.2B, but in recent years it has been difficult to secure this mountain sand. ,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.

2- (4) When digging up the backfill soil 2B when repairing the buried pipe 3, etc., the buried pipe 3 may be accidentally damaged.

Therefore, the purpose of the present invention is to require only a small amount of backfill soil, to require only a small amount of compaction work for the backfill soil, and to reduce the risk of accidentally damaging buried pipes when removing the backfill soil. The object of the present invention is to provide a method for laying underground 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 injecting a foamed resin material into the trench from above ground. , the foamed resin material is foamed in the groove, the buried pipe is covered with the foamed resin, and 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 13-, then lays a buried pipe 3 in the groove 1 via a spacer 2, and then fills the groove I with a foamed resin such as styrofoam. The raw material is injected from the foamed resin injection device 4 to foam the foamed resin raw material in the groove 1, thereby covering the buried pipe 3 with the foamed resin 5, and backfilling the upper part of the groove 1 with backfilling soil 6. It consists of things.

The foamed resin injection device 4 is installed on the ground, and injects the foamed resin material into the trench through an injection pipe 7. The foamed resin material foams within the groove 1 and then hardens. As a result, the buried pipe 3 is completely covered with the foamed resin 5.

In this way, the buried pipe 3 laid in the groove 1 is connected to the foamed resin 5.
By covering with the foam, the amount of backfilling soil is greatly reduced, compaction of the backfilling soil only needs to be done with the backfilling soil 6 at the end, and the foamed resin 5 has excellent cushioning properties and is lightweight. The strength of the buried pipe 3 can be reduced accordingly, and furthermore, when digging up the backfilling soil 3 during repair of the buried pipe 3, etc., the foamed resin 5 can be easily dug up.
4- There is less risk that the equipment will be damaged by excavators, etc.

[Effects of the Invention] As explained above, according to the present invention, the following useful effects are brought about by replacing part of the backfilling soil with foamed resin.

(1) Since the amount of backfilling soil is significantly reduced, securing mountain sand for backfilling soil and compacting work are reduced.

(2) Since the load on the buried pipe is reduced, it is possible to use a buried pipe with lower strength.

(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 drawing, 1. Groove,
2... Spacer 3... Jllll i dip tube,
4. Foamed resin IE equipment, 5. Foamed resin, 6. Backfill soil. 7... Injection pipe.

Claims (1)

[Claims] 1. Excavating a trench, then laying a buried pipe in the trench via a spacer, and then injecting a foamed resin raw material into the trench from the ground to foam the foamed resin raw material in the trench. Thus, the method for laying a buried pipe is characterized in that the buried pipe is covered with a foamed resin, and the upper part of the trench is backfilled with backfilling soil.