JPH0814349B2 - Civil engineering method for underground pipes - Google Patents

Description

Description: [Industrial field of application] The present invention relates to a method for constructing underground buried pipes such as oil pipes, gas pipes, water pipes, and pipes for passing communication cables, and particularly to improving the construction efficiency. It is a thing.

[Prior Art] When burying oil pipes, gas pipes, water pipes, etc. in the ground, it is necessary to bury them at a certain depth or more from the ground surface to protect the oil pipes.

When burying such oil pipes and gas pipes, first, the road surface at the burying position is torn down, excavated for a unit length to remove the earth and sand, and then earth retaining and water replacement.
Next, a pipe is placed in the excavated groove, welded and joined to the previously buried pipe, and then backfilled. When burying pipes in this way, civil works and piping work are performed in a series of sequence from the start to the end of construction.

Then, when forming the groove, the mountain retaining and water change should be performed with sufficient care to prevent the roadbed or the like from collapsing during the piping work. Also, when backfilling is performed after the pipe is arranged, in order to prevent the pipe from floating unbalanced pressure at the backfilling part,
Spread the backfilled soil to the same thickness on the left and right so that the thickness is about 20 to 30 cm, and carefully compact the spread soil with a rammer or tamper, etc. Increases water tightness and strength. This rolling is repeated to backfill the excavated trench.

[Problems to be Solved by the Invention] In the case of burying a pipe as described above, an ironworking work such as piping and installation is performed between the civil works such as excavation and backfilling to perform the civil works. Workers play during ironwork. Further, the ironworking work is only done within 2 to 3 hours a day, which is very inefficient.

Further, in order to secure the safety of the piping work, it is necessary to firmly mount the mountain and perform water replacement, which is not easy.

Further, when the pipes are aligned at the time of welding, if the squareness of the pipe end faces does not appear to a certain extent, the newly installed pipe is tilted slightly to the left and right and up and down to make the weld clearance uniform. Therefore, there is a disadvantage that the excavation hole needs to be wide and deep.

In addition, there is a disadvantage in that a large amount of good quality sand is required for backfilling, and it is expensive to carefully compact the sand.

Also, when actually installing a buried pipe and performing backfilling,
It is difficult to achieve sufficient compaction over the entire range of a long buried pipe, and in some cases there is a risk of insufficient compaction. If there is such an inaccurate rolling part, the buried part of the pipe will be depressed, and excessive earth pressure will act on the buried pipe, causing cracks or breakage in the pipe body, or accidental damage such as the joint part falling out. There was a disadvantage that it could cause.

Further, if the civil engineering work takes a long time, the traffic regulation time becomes long, and there is a disadvantage that traffic congestion is likely to occur.

The present invention has been made to solve the above disadvantages, and an object of the present invention is to propose a civil engineering construction method for an underground buried pipe that can efficiently bury the pipe.

[Means for Solving the Problem] The method for constructing an underground pipe according to the present invention is a method for constructing an underground pipe by installing an embedded pipe in a groove formed by excavating the soil and backfilling the soil. In the groove formed by, the block made of foamed resin that can support earth pressure and having a height larger than the outer diameter of the buried pipe is temporarily placed and then backfilled immediately. It is characterized in that a hole is drilled from the side surface to form a piping hole, and the pipe is drawn into the piping hole for piping.

[Operation] In the present invention, the block made of foamed resin capable of supporting earth pressure is temporarily raised in the groove formed by excavating the earth and sand, and then immediately backfilled with the earth and sand excavated to fix the block in the ground. Because it does, there is no need for a clasp.

In addition, since a pipe for burying is drawn into the pipe hole formed in the fixed foamed resin block and pierced, new earth and sand for backfilling is not required, and the construction can be performed easily and quickly.

Furthermore, by embedding the pipe in a block of foamed resin that is lightweight and self-supporting, it is possible to reduce the additional load such as vertical earth pressure acting on the embedded pipe.

[Embodiment] FIGS. 1A to 1F are sectional views showing steps of an embodiment of the present invention. When burying the pipe 3 in the ground 1, first, as shown in FIG. 1 (a), the ground 1 is excavated by a unit length to form a groove 2 having a depth D which becomes a soil cover. Next, as shown in FIG. 1 (b), a block 4 which can support earth pressure in the groove 2 and is made of, for example, a polystyrene foam molded product.
Is installed. As shown in the perspective view of FIG. 2, the block 4 has flat upper and lower surfaces, and when installed in the groove 2, the thickness t is larger than the outer diameter of the tube 3 and is a constant distance d from the depth D of the groove 2. The width W is also processed according to the width of the groove 2. By installing the block 4 processed in this way in the groove 2, the sand on the side surface of the groove 2 can be suppressed by the block 4 without clogging.

After the block 4 is installed, in order to prevent the block 4 from slipping off and prevent the block 4 from rising, a floor slab 5 made of iron or concrete is placed on the block 4 as shown in FIG. 1 (c). Fix 4 After that, the space between the groove 2 and the block 4 and the floor slab 5 is filled with soil generated at the time of excavation to close the space, and the block 4 and the floor slab 5 are tightly connected to the groove 2. After backfilling the groove 2 with the block 4 and the floor slab 5 in this way, asphalt concrete 6 is laid on the floor slab 5 as shown in FIG. 1 (d), and the groove 2 is completely backfilled by rolling. Open to traffic.

After that, as shown in FIG. 3 at a later date, a pipe / joining groove 7 having a size corresponding to the diameter and length of the pipe 3 to be buried is excavated as shown in FIG. ) As shown in FIG.
A hole 8 for piping which is large by about 5 mm is opened by the propulsion method. The pipe hole 8 is a pipe having a heating element which is fixed to the end of the lot 41 through which the cable is passed, as shown in FIG.
It can be easily opened by using the hole making jig 40 composed of 42, or by using the jig 50 in which the heating element 52 is fixed to the tip of the pipe 51 as shown in FIG. At the time of drilling, by connecting the lot 41a to the rear end of the lot 41 with a screw, the pipe hole 8 having a depth corresponding to the length of the pipe 3 is formed.
Can be opened.

After opening the piping hole 8, unnecessary polystyrene foam in the hole 8 portion is removed. Then, as shown in FIG. 1 (f), the pipe 3 is drawn into the hole 8 and the front and rear pipes 3 are joined by welding or the like for piping. After that, the gap between the pipe 3 and the block 4 is filled with the sealing material 9, and the pipe / joining groove 7 is backfilled.

By embedding the pipe 3 in the block 4 made of styrofoam in this way, the additional load acting on the pipe 3 can be significantly reduced. That is, the unit weight of styrofoam is 0.02 to 0.04 (t / m ³ ), which is 1/10 to 1/20 of the unit weight of earth and sand 1.6 to 2.0 (t / m ³ ). Therefore, the vertical load due to soil fogging can be reduced in proportion to this value.

In the above-mentioned embodiment, the case where the pipe hole 8 is opened in the block after the groove 2 is backfilled is shown. However, the pipe hole 8 is opened in advance in the block 4, or the block 4 has a semi-cylindrical shape. Even if a two-divided block having a groove is used, the same operation as in the above embodiment can be achieved.

Further, in the above-mentioned embodiment, the case where the block 4 is formed of styrofoam has been described, but other foam resins can be used as long as they can support the earth pressure, and the same effect as in the above-mentioned embodiment can be obtained. You can

[Effects of the Invention] As described above, according to the present invention, the groove formed by excavating the earth and sand is backfilled with the block made of the foamed resin having a large height which is larger than the outer diameter of the embedding pipe so that the earth and sand can be blocked. Since it can be suppressed, the retaining of the excavated trench can be omitted. Civil engineering work efficiency can be improved.

Also, by pulling in the pipe for embedding into the pipe hole formed in the foamed resin block fixed in the groove,
Since new earth and sand for backfilling is not required, the construction cost can be reduced and the construction can be performed easily and quickly.

Further, since the civil engineering work of trench excavation and backfilling and the piping work of the pipe can be separated, the pipe burying work can be efficiently performed.

Further, the traffic can be opened immediately after the completion of the civil engineering work, and the traffic restriction due to the pipe burying can be minimized.

Furthermore, by embedding the pipe in a foamed resin block that is lightweight and self-supporting, it is possible to reduce the additional load such as vertical earth pressure acting on the buried pipe, and prevent the buried pipe from being damaged. can do.

[Brief description of drawings]

1 (a) to 1 (f) are sectional views showing steps of an embodiment of the present invention, FIG. 2 is a perspective view showing a block, FIG. 3 is a perspective view showing a hole for piping, and FIG. Perspective view showing the jig,
FIG. 5 is a side view showing another drilling jig. 2 ... Groove, 3 ... Tube, 4 ... Block, 5 ... Floor slab, 6
…… Asphalt concrete, 7 …… Piping / joining groove, 8 …… Piping hole.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kimio Sato 566-4 Karasawa, Fujisawa City, Kanagawa Prefecture (56) References JP-A-60-181426 (JP, A) JP-A-61-40937 (JP, A) JP-A-1-172691 (JP, A) JP-A-1-174729 (JP, A)

Claims (1)

[Claims] 1. In a civil engineering construction method in which a buried pipe is installed and backfilled in a groove formed by excavating earth and sand, the groove formed by excavating earth and sand is made of a foamed resin capable of supporting earth pressure, Temporarily place a block with a height larger than the outer diameter of the buried pipe, and then immediately backfill it, and then drill holes from the side of the backfilled block by the propulsion method to form a hole for piping Civil engineering method for underground pipes, which is characterized in that the pipe is drawn into the pipe.