JPH0545837B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of laying a buried pipe.

[Prior Art] Conventionally, in order to lay underground pipes such as water pipes and gas pipes, as shown in FIG. , solidify this. 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 conventional buried pipe installation method described above had the following problems.

(1) The soil after excavating trench 1 is used as buried soil 2A and 2B.
Mountain sand is normally used as the backfill soil 2A, 2B, but it has been difficult to secure this mountain sand in recent years.

(2) If it takes time and effort to compact the backfilling soil, and if the compaction is not uniform, bending force will be applied to the buried pipe 3 due to ground subsidence, etc., and there is a risk that the buried pipe 3 will be damaged. 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 backfill soil 2B when repairing the buried pipe 3, etc., the buried pipe 3 may be accidentally damaged.

Therefore, an object of the present invention is to use a small amount of backfill soil, to minimize the compaction work of the backfill soil, and to reduce the risk of accidentally damaging buried pipes when digging 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 foamed resin molded bottom plate at the bottom of the trench, then laying a buried pipe on the bottom plate, and then Lay foam resin molded side plates and top plates around the pipe,
Next, the groove is backfilled, and the gaps formed between the buried pipe and the bottom plate, side plate, and top plate are filled with foamed resin powder. .

Next, one embodiment of the buried pipe laying method of the present invention will be described 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.
excavate. Next, a foamed resin molded bottom plate 4A made of styrene foam or the like is laid at the bottom of the groove 1. Next, the buried pipe 3 is laid on the bottom plate 4A. Then,
Side plates 4B made of foamed polystyrene or the like are placed on both sides of the buried pipe 3, and then an upper plate 4C made of the same material is placed on top of the side plates 4B. After the foamed resin molded plate is laid around the buried pipe 3 in this manner, the groove 1 is backfilled with backfilling soil 2. Then, from the pipe end direction of the buried pipe 3, a foamed resin powder 5 such as styrofoam is inserted between the holes formed between the buried pipe 3 and the bottom plate 4A, side plate 4B, and top plate 4C.
Fill it with.

The reason why the foamed resin powder 5 is filled around the buried pipe 3 is as follows. That is, the feature of the present invention is that the buried pipe 3 is covered with a foamed resin molded plate, so that the shape of the molded plate differs depending on the diameter of the buried pipe 3. Therefore, it is necessary to prepare various types of molded plates. However, if the foamed resin powder 5 is used,
By changing the filling amount, the types of molded plates to be prepared can be reduced.

In the embodiment described above, the buried pipe 3 is directly attached to the bottom plate 4A.
Since it is placed on top, the foamed resin powder 5 does not spread to the lower part of the buried pipe 3. In order to sufficiently spread the foamed resin powder 5 in the lower part of the buried pipe 3, as shown in FIGS. 2 and 3, spacers 6 are placed on the bottom plate 4A.
The buried pipe 3 may be laid through the pipe.

[Effects of the Invention] As explained above, the present invention provides the following effects.

(1) The amount of backfill soil is reduced by the amount of foam resin molded board.

(2) Buried pipes will be reinforced with foam resin molded plates.

(3) Unlike when all trenches are buried with backfill soil, there is no need to compact the backfill soil, so buried pipes are less likely to be damaged due to ground subsidence, etc.

(4) By using foamed resin powder, the number of types of foamed resin molded plates can be reduced.

(5) When backfilling soil is dug up when repairing buried pipes, etc., the foamed resin molded board can be clearly distinguished from the backfilling soil, so there is no chance of accidentally damaging the buried pipe.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing one embodiment of the underground pipe laying method of the present invention, FIG. 2 is a cross-sectional view showing another embodiment, and FIG. 3 is a line A-A in FIG. The line sectional view, FIG. 4, is a sectional view showing a conventional buried pipe laying method. In the drawings, 1... trench, 2, 2A, 2B... backfill soil, 3... buried pipe, 4A... bottom plate, 4B... side plate, 4C... top plate, 5...
Foamed resin powder, 6...Spacer.

Claims (1)

[Claims] 1. Excavate a trench, then lay a foamed resin molded bottom plate at the bottom of the trench, then lay a buried pipe on the bottom plate, and then install foamed resin molded side plates and a top plate around the buried pipe. and then backfilling the trench, and then installing the buried pipe and the bottom plate,
A method for laying a buried pipe, characterized by filling a gap formed between a side plate and a top plate with foamed resin powder.