JPH05126282A - Construction method for laying pipe body - Google Patents

Abstract

PURPOSE:To provide a construction method for laying a pipe body wherein an execution part of manual work is only required by a small amount as compared with the conventional method and piping can be prevented from its deformation and damage due to a soil pressure in the case of laying a supply/drain water pipe or the like in the depth such as exceeding 5m. CONSTITUTION:A pipe body 4 is arranged in a bottom part 1 in an open cutting groove, and a foaming styrene-made block layer 5 is provided on at least an upper half barrel peripheral surface of the pipe body 4 to coat it thereafter to perform backfilling. By the method thus performed, the foaming styrene-made block layer 5 is compressed to absorb partly a large soil pressure and also dispersing partly sideward the soil pressure form upward, so that a bad influence to the pipe body can be impeded by reducing the soil pressure and its reaction force applied to the pipe body 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of laying a pipe, and more particularly to a method of laying a pipe suitable for use in piping at a depth of 5 m or more.

[0002]

2. Description of the Related Art When laying a water supply / drainage pipe or a conduit pipe,
After excavating the soil surface to form an excavated groove, after compacting the bottom of the groove and the foundation of the groove wall, arrange a pipe body at the groove bottom and connect it to each other, backfill the earth and sand and crushed stone, and tamper Is a general conventional method.

The depth of the buried pipe is roughly divided into 5 m or less (referred to as “shallow buried pipe”), 10 m or more (referred to as “deep buried pipe”), and more than 5 m and less than 10 m (“medium”). It is divided into three) (referred to as a "buried pipe of a degree"),
In any case, the above-mentioned conventional method is adopted.

[0004]

However, the work such as backfilling and compaction of earth and sand in this conventional construction method is performed manually, and the work contents tend to be rough, and the technical level varies depending on the contractor. There is usually no uniform construction result. Even if there is any deficiency in the construction, it is almost impossible to check it after the construction is completed, and the deficiency will not occur until the trouble such as water leak or road collapse occurs at a later date. It is the present situation to expose.

On the other hand, in the pipe construction of medium-sized buried pipes and deep buried pipes, it is needless to say that if there is a construction defect as described above, even if excellent construction without any defect is performed, it is buried. A large earth pressure is applied to the pipes, and the buried pipes are easily deformed or damaged. Especially, the tendency becomes stronger as the diameter increases.

In view of the above situation, the present invention aims to homogenize the work contents by reducing the manual work such as backfilling as much as possible particularly in the pipe construction of medium-sized buried pipes and deep buried pipes. , The purpose of the present invention is to provide a method for laying a pipe body that does not deform or damage the buried pipe even after a large earth pressure is exerted on the buried pipe for a long time after the construction. ..

[0007]

DISCLOSURE OF THE INVENTION The present invention provides a method of laying a tubular body, characterized in that a styrofoam block layer is provided on at least the upper half of the tubular body to cover the tubular body. It is what

The pipes to which the pipe laying method of the present invention is applied are usually circular pipes, but various pipes such as an elliptical pipe such as an oval pipe and a polygonal pipe close to a circle are used. The pipe is the target. However, the laying method of the pipe body of the present invention does not prevent its adoption in the pipe construction of the pipe body having other cross-sectional shapes.

The expanded polystyrene block used in the present invention means a large expanded polystyrene (Expanded Poly-St
yrol) block (hereinafter referred to as “EPS block”), and in the present invention, the EPS block layer is disposed on at least the upper half of the pipe as a part of the base material, and the EPS block has Its main point is to make use of material properties such as ultra-lightness, compressibility, and high shock-absorbing properties, and the homogeneity of mass production.

In the present invention, it suffices that the EPS block layer is provided on at least the upper half of the circumference of the pipe, but it should also be provided on the lower half of the circumference of the pipe, that is, the entire circumference of the pipe body. It does not prevent you from setting up.

[0011]

The present invention is a method in which a foamed polystyrene block layer is provided on at least the upper peripheral surface of the tubular body to cover the tubular body, and then backfilling is carried out. The amount of sediment for backfilling is small, and the EPS block occupies a uniform construction technology. Furthermore, the earth pressure applied to the buried pipe from above is partially absorbed by the compression of the EPS block, and the earth pressure from above is dispersed laterally, reducing the earth pressure from above.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view for explaining an embodiment of the present invention, in which 1 is a bottom of an excavation groove and 2 is a bottom portion 1 of the excavation groove which is separately formed by excavation. It is a small groove. After excavating this small groove 2, next, blast furnace slag (Hydrauli) is filled so that the inside of this small groove 2 is almost filled.
c and Mechanically Stabilized Slag, "HMS"
Say 3). This HMS3 is produced as a large amount of waste from steelworks, but since it is a material with hydraulic properties comparable to slaked lime and cement, it has recently come to be used as a basic material around buried pipes. Is.

Next, the pipe body 4 to be connected by piping on the HMS
Arrange the required number of and connect to each other. After the connection is completed, the EPS block layer 5 is continuously formed on the outer peripheral surface of the upper half of the tube body 4 by the EPS block to cover the tube body 4.

As shown in FIG. 2, the EPS block layer 5 includes a straight pipe portion EPS block 6 arranged in the straight pipe portion of the pipe body 4, and a receptacle portion EPS block 6 arranged in the receptacle portion. It consists of 7. In any case, the portion that comes into contact with the tubular body 4 and is pressed by the earth pressure has curved surfaces 8 and 9 that have the same curvature as the curved surface of the tubular body 4 or a curved surface having an approximate curvature. The curved surfaces 8 and 9 are attached so as to cover the straight pipe portion and the receiving portion.

In order to attach the EPS blocks 5 and 6 to the straight pipe portion and the receiving portion of the pipe body 4, the EPS blocks 5 and 6 may be simply covered on the straight pipe portion and the receiving portion of the pipe body 4. However, the pressing surfaces 8 and 9 have a curvature slightly smaller than that of the tubular body 4, and the elasticity is used to fit the tubular body 4 on the EPS block and the tubular body. A method of forming an adhesive layer such as a double-sided adhesive tape on the contact surface of is preferable.

Next, backfilling 10 is performed to a predetermined height to complete the laying. The EPS block in the present invention is
In the above embodiment, the straight pipe part EPS block arranged in the straight pipe part and the receiving part EPS block arranged in the receiving part are both formed separately, The invention is not necessarily limited to this, and both may be integrally formed.

Further, although it has been stated in the above embodiment that the pipe body is covered with the EPS block after the pipe body is arranged and connected in the excavation groove, the pipe connection is made on the ground, and the EP
The S block layer may be provided and lowered into the open cut groove, or only the pipe connection may be performed on the ground, and the EPS block layer may be provided after dropping this into the open cut groove.

The shape and size of the EPS block used in the present invention include the burial depth, the hardness of the ground, the diameter of the pipe body,
The width is set appropriately depending on the material and other factors. For example, in the case of the above embodiment, the width is almost the same as the outer dimension of the tubular body, but as shown in FIG. The EPS block 11 having a large overhang is also used. As shown in FIG. 2, the length of the straight pipe portion EPS block 6 is shorter than the length of the straight pipe portion of the pipe body 4 by the length of the connecting portion 12 inserted into the receiving port of the pipe body 4. Done

Next, regarding an example of general dimensional relations,
It shows in Table 1.

[0020]

[Table 1]

(Note) 1. See FIG. 1 for X, Y, and Z. 2. Unit is mm

[0022]

EFFECT OF THE INVENTION The present invention is a construction method in which a foamed polystyrene block layer is provided on at least the upper half of the tubular body to cover the tubular body, and then backfilling is performed.
By using the blocks, the amount of earth and sand for backfilling can be reduced by that much, and the part occupied by the EPS blocks will have a uniform construction content. Furthermore, the earth pressure applied to the buried pipe from above is partially absorbed by the compression of the EPS block, and the earth pressure from above is dispersed laterally, reducing the earth pressure from above and its reaction force. ..

Therefore, the influence of earth pressure on the buried pipe is reduced, the pipe not only lasts longer, the workability and workability are improved, the construction period is shortened, and the construction cost is gradually reduced.
Not only is it effective for the construction of medium buried pipes of 0 meters and deep buried pipes, but it is also effective for the construction of shallow buried pipes of 5 meters or less.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing an embodiment of the present invention.

FIG. 2 is a perspective view showing a piping state of FIG. 1, and is a perspective view showing a tubular body and a styrofoam block layer.

FIG. 3 is a schematic sectional view showing another embodiment of the present invention.

[Explanation of symbols]

 1 Bottom of open cut groove 2 Small groove 3 Blast furnace slag 4 Tubular body 5 EPS block layer 6 EPS block of straight pipe section 7 EPS block of receiving part 8 Curved surface 9 Curved surface 11 EPS block of straight pipe section

Claims (1)

[Claims] 1. A method of laying a tubular body, characterized in that a styrofoam block layer is provided on at least the upper half of the tubular body, and then backfilled.