JPH0333584A - How to lay underground pipes - Google Patents

Abstract

PURPOSE:To prevent a buried pipe from being damaged due to ground subsidence or the like by adhering granular foaming resin to the outer surface of the buried pipe at the time of burying the buried pipe underground. CONSTITUTION:At the time of laying a buried pipe 3 in a ditch 1 through a spacer 4, foaming resin 5 made of granular foaming styrene and the like is adhered to the outer surface of the buried pipe 3 by adhesive such as resin, mortar, asphalt or water glass. The anticorrosive effect of the buried pipe 3 is heightened by the granular foaming resin 5 adhered to the outer surface of the buried pipe 3, so that only light anticorrosive coating is sufficient for the buried pipe 3. Moreover, with the cushioning action of the foaming resin, the buried pipe 3 is prevented from being damaged by the bending force generated due to ground subsidence or the like. The soil generated by ditch drilling and the like can be used as the earth to be refilled 2.

Description

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

[Conventional technology] Conventionally, when laying underground pipes such as water pipes and gas pipes, a second
As shown in the figure, first, a trench 1 is dug, and then a backfilling top 2A is placed in the bottom of the trench 1 and tamped. Next, the buried pipe 3 is laid on the backfilling top 2A, and the backfilling top 2B is placed on top 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 has been excavated is not used as the backfill tops 2A and 2B, and mountain sand is normally used for the backfill tops 2A and 2B. Have difficulty.

(2) If tamping, etc. on backfilling takes time and effort, and the tamping is not uniform, there is a risk that bending force will be applied to the buried pipe 3 due to ground subsidence, etc., causing damage to the buried pipe 3. be.

(3) Since buried pipes corrode, it is necessary to form a corrosion-preventing coating on the outer surface of the buried pipes.

(4) When digging up the backfilling top 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 make it possible to use generated soil as backfilling material, to prevent buried pipes from being damaged by bending forces caused by ground subsidence, etc., and to provide a corrosion-preventing coating to be applied to the outer surface of buried pipes. To provide a method for laying a buried pipe, which requires only a slight amount of damage and further reduces the risk of accidentally damaging the buried pipe when digging up the backfill.

[Means for Solving the Problems] The present invention is characterized in that when a buried pipe is buried underground, granular foamed resin is adhered to the outer surface of the buried pipe.

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 describes one embodiment of a buried pipe laying method with reference to the drawings.

As shown in FIG. 1, the present invention provides that, when laying a buried pipe 3 in a groove 1 via a spacer 4, the outer surface of the buried pipe 2 is coated with granular adhesive such as resin, mortar, asphalt, water glass, etc. , to which a foamed resin 5 such as styrofoam is attached.

Since the granular foamed resin 5 adhering to the outer surface of the buried pipe 3 increases the anticorrosion effect of the buried pipe 3, the anticorrosion coating applied to the buried pipe 3 only needs to be light. Further, due to the cushioning effect of the granular foamed resin 5, the buried pipe 3 is less likely to be damaged by bending force caused by ground subsidence or the like. Moreover, the surface generated during trench excavation can be used as the backfilling surface, and the distinction between the backfilling surface and the granular foamed resin 5 is clear, so the backfilling surface 2 can be used when repairing the buried pipe 3, etc. When digging up, there is less risk of accidentally damaging the buried pipe 3.

[Effects of the Invention] As explained above, according to the present invention, by attaching granular foamed resin to the outer surface of the buried pipe, generated soil can be used as backfilling material, and the anti-corrosion coating applied to the buried pipe is minimal. Various useful effects can be brought about, such as the fact that buried pipes are less likely to be damaged due to ground subsidence, and that buried pipes are less likely to be accidentally damaged when backfilling is dug up.

[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 method. In the drawings: 1...Groove, 2...Backfill top, 3...Buried pipe, 4...Spacer 5...Foamed resin.

Claims (1)

[Claims] 1. A method for laying a buried pipe, which comprises attaching granular foamed resin to the outer surface of the buried pipe when burying the buried pipe underground.