JPH01172691A - Embedment of piping and cable - Google Patents

Abstract

PURPOSE:To execute the piping embedment work in which piping and a cable along the piping are embedded, at low cost by embedding the piping and the cable with a resin foamed block allocated around the piping and the cable. CONSTITUTION:In the embedment work of a piping 2 and a communication cable, a resin foamed block 4a is inserted into an embedment groove 40, a piping 2 is installed inside the groove 40, and a resin foamed block 4b is piled on the groove 40. Next, resin foamed blocks 4c and 4e are piled on the resin foamed block 4b, a communication cable 3 is installed in the groove 40 and resin formed blocks 4d and 4f are put on the blocks 4c and 4e. Earth and sand 5 are thrown back on the blocks 4d and 4f and the pavement work 6 is done. As a result, the amount of the thrown back earth and sand may be little and the coating of the piping is not damaged. There is little possibility of generating a load stress on the piping or the like due to sinking of the ground.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to piping and a method for burying cables laid along the piping.

[Conventional technology]

Conventionally, when burying pipes such as water pipes and gas pipes, as well as cables (communication cables, etc.) that run along them, the method used is to backbury the pipes while compacting the soil.

In this case, generated soil is rarely used as the backfilling material, but high-quality sand with a good particle size distribution, such as river sand or mountain sand, is used.

[Problem that the invention seeks to solve]

However, such conventional methods have the following problems.

■ Backfilling trenches requires a large amount of high-quality backfill sand, but in recent years it has become difficult to obtain such sand.

■ If gravel or other debris is placed inside the backfill, it will be difficult to remove it, and if left as is, it may damage the coating on piping and cable pipes.

■ Because the earth and sand (on the backfill) itself is heavy, heavy machinery (
(backhoe, truck) will be required.

■ It is difficult to compact the backfill evenly, especially the diagonally lower part of pipes and cable pipes. If the backfilling is insufficiently tamped, stress may be applied to the piping or cable pipes due to ground subsidence, which may cause leakage of the contents.

■ Because ground strain propagates directly to piping and cable conduits, piping is easily damaged by earthquakes, etc.

■ Digging work when inspecting and repairing pipes, etc. is similar to backfilling work for pipes, and is complicated.

■ Even if only the piping is inspected or repaired, the cables must be lifted up and backfilled again, which is complicated.

In contrast to this conventional method, a method has been proposed in which a pipe is constructed as shown in Figure 6, but the concrete blocks used in this method are heavy and Burying work, inspection, and digging up for repair are extremely difficult.

The present invention aims to provide a new method for burying pipes and cables that does not cause such conventional problems.

[Means for solving problems]

Therefore, the basic feature of the method of the present invention is that when burying the pipes and cables along the pipes, the pipes and cables are buried with resin foam blocks arranged around them. do.

Usually, a resin foam block such as expanded polystyrene is formed into several divided blocks in the circumferential direction of the pipes and cables, and is assembled in a buried trench so as to surround the pipes and cables.

The upper part of the resin foam surrounding the pipes and cables will be backfilled with earth and sand as necessary.

As the resin foam, in addition to expanded polystyrene, foams made of other polymeric materials can be used.

Such a burying method of the present invention can be used to bury water and sewerage pipes, gas pipes,
It can be applied to all kinds of piping, such as oil pipelines, and to burying communication cables such as optical fiber cables, coaxial cables, telephone lines, and electric cables.

〔Example〕

FIG. 1 shows an example of how pipes and cables are buried according to the burying method of the present invention. In the figure, l is a buried trench;
2 is piping, and 3 is a cable.

In this embodiment, a pair of upper and lower resin foam blocks 4a and 4b which form a piping space A by matching grooves 40 having semicircular cross sections, and grooves 40 having semicircular cross sections
0' A pair of upper and lower resin foam blocks 4C and 4 which form a cable installation space B by joining together.
d, 4e and 4r are used. When burying piping and cables, first fit the resin foam block 4a into the burying groove 40 with the groove 40 facing upward, place the piping 2 in the burying groove 40, and then insert the resin foam block 4a from above. Place the body block 4b with its groove 40 facing downward. Next, the resin foam block 4 is placed on the resin foam block 4b.
C and 4e with their grooves 40 and 40 facing upward,
After each communication cable 3 is placed in the groove 40, the resin foam blocks 4d and 4'' are placed in the groove 40 from above.
and 40 facing downward.

Then, earth and sand 5 is backfilled onto these resin foam blocks 4d and 4r, and paving 6 is performed thereon. In addition, in this way, the resin foam block 4c.

Providing the earth and sand layer on the 4f is advantageous in preventing the resin foam blocks from melting due to heat during paving.

FIG. 3 shows another embodiment of the present invention.
, 4e and 4r are arranged above the resin foam blocks 4a and 4b for piping, whereas in this embodiment, a pair of upper and lower blocks that can form two parallel cable installation spaces B are arranged. A resin foam block 41.4j is arranged on the side of a pair of upper and lower resin foam blocks 4g and 4h for piping, and a resin foam block for laying a spare cable is placed above the resin foam blocks 41 and 4j. In block 4, 4Jll is installed. In this case, first, fit the resin foam blocks 4g and 41 side by side into the buried groove 1 with their valley grooves 40 facing upward, and place the piping 2 on top of the resin foam blocks 4g and 41.
After arranging the cables 3.degree.3, the resin foam blocks 4h and 4j are placed thereon with their grooves 40 facing downward.

Next, the resin foam block 4k is placed on the resin foam block 4j with its groove 40 facing downward, and the resin foam block 4Ω is placed on top of the resin foam block 4k, thereby forming a preliminary hole 7 for the cable. Further, a plate-shaped resin foam block 4m is placed on the resin foam block 4h. and,
Earth and sand 5 is backfilled onto these resin foam blocks. Since the resin foam block for cables has a small cross-section for installation, it is preferable to use a two-plate type block as shown in the above example, but for piping, for example, when the cross-section is rectangular Alternatively, the piping can be surrounded on all sides by plate-shaped blocks.

Further, FIG. 4 shows an example of application of the method of the present invention. That is, in this example, a resin foam block was used only for cable laying, and as a resin foam block,
A lower resin foam block 8 having a lower surface 81 formed with an arcuate cross section that can fit into the upper surface of the pipe, and a groove 80 formed in the upper surface.
and an upper resin foam block 9 having grooves 90 on the lower surface. In this case, after the piping 2 is installed on the backfilling top 10 in the burial trench, the resin foam blocks 8 and 9 are provided on the top of the piping 2, the cable 3 is laid, and then the surrounding area is And the upper part is backfilled with backfilling lO.

〔Effect of the invention〕

According to the above-described method for burying pipes, etc. of the present invention, resin foam blocks are placed around the periphery instead of earth and sand to bury the pipes and cables, so that the following effects can be obtained.

■ The amount of high-quality soil used for backfilling is extremely small;
Piping burying work can be performed at low cost.

■ Because backfilling does not come into direct contact with piping and cables,
Even if gravel is included in the backfill, it will not damage the coating of piping, etc.

■ Because the pipes and cables are surrounded by resin foam such as Styrofoam, which is uniform in material and has sufficient strength, load stress may occur on the pipes and cables due to poor ground conditions, and ground strain during an earthquake will directly propagate to the pipes. leakage of the contents can be effectively suppressed.

■ Resin foam blocks are lightweight (about 1/1 the weight of earth and sand)
100), it is easy to handle.

■ Since piping and cables are laid inside the resin foam block, it is easy to dig up and expose the piping and cables.

■ There is no need to use heavy equipment (backhoes, trucks) when digging up pipes and cables to inspect or repair them, so there is no damage to the pipes or cables.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing how pipes and cables are buried according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the upper and lower resin foam blocks and piping of the buried structure in FIG. 1. FIG. 3 is a sectional view showing a buried state of pipes and cables according to another embodiment of the method of the present invention. FIG. 4 is a sectional view showing a cable buried state according to an applied example of the method of the present invention. FIG. 5 is a sectional view showing how pipes and cables are buried according to the conventional method. FIG. 6 is a front view showing a state in which piping and cables are buried according to another conventional method. In the figure, 1 is a buried trench, 2 is a pipe, 3 is a cable, and 4 is a buried trench.
A to 4m represent resin foam blocks, and 5 represents earth and sand. Figure 2 Figure 3 Figure II4 Figure 5

Claims (1)

[Claims] A method for burying piping and cables, the method comprising burying the piping and cables with a resin foam block placed around the piping and cables.