JPH07229581A - Pipe body laying structure - Google Patents

Abstract

PURPOSE:To tightly compress soil and the like beside a pipe body so as to prevent the pipe body from flattening by parallelly burying an elastic plate body above the pipe body at the predetermined clearance from a pipe top to the pipe body buried in the soil and the like. CONSTITUTION:An opened ditch 4 is formed by digging a soil face, and soil of a ditch bottom and ditch walls are compacted, and over them, required number of pipe bodies P, P... are arranged so as to be connected with each other. Around the connected pipe bodies P, high rigidity base material such as soil and crushed stone are compacted to the height above the pipe top by approximately 1/5 of the pipe outside diameter so as to bury the pipe bodies P. Then, soil and crushed stone are backfilled to the predetermined height, and an elastic plate bodies 1 are arranged parallelly to the pipe bodies P so as to be buried above the pipe bodies P at the interval of 1/5-3/2 of the pipe outside diameter from the pipe top. In this way, a pressure of the soil A above the elastic plate body l is directed to the soil (b), (c) beside the pipe body P because of compression of the elastic plate body 1, so that the pressure applied to the soil (b), (c) beside the pipe body P is increased and the soil (b), (c) is tightly compacted, and as a result, the pipe body is not deformed flatly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pipe laying structure.

[0002]

2. Description of the Related Art A pipe body buried in earth and sand has a problem that the pipe body is flattened and crushed by the earth pressure above the pipe body. In order to withstand the above earth pressure, a technique has been proposed in which an elastic body 15 processed so as to follow the shape of the tube is provided on the upper surface of the tube (illustrated in FIG. 3) (actually open flat 3-58380).
Issue).

Further, when the soil on the side of the pipe is hardened, the pipe does not flatten, so embankment is applied to the soil surface on the side of the pipe.
It is also known that the weight of the embankment consolidates the soil on the side of the tube to solidify it.

Further, as a method for laying the pipe body, the periphery of the pipe body is provided with a highly rigid base material such as earth and sand or crushed stone to a position above the pipe body (a distance from the pipe top to about 1/5 of the pipe outer diameter). It is also known to be buried so as to hide.

[0005]

[Problems to be Solved by the Invention] However, the actual Kaihei 3-5
The technique disclosed in Japanese Patent No. 8380 has a problem that it is necessary to process the elastic body on the upper surface of the tubular body for each tubular diameter so as to match the outer diameter of the tubular body along the tubular shape.

In addition, when embankment is applied, it takes time until the ground on the side of the pipe body is consolidated, resulting in poor workability.

[0007]

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned problems, and for a pipe body buried in earth and sand,
From the top of the tube to the elastic plate, 1/5 to 3/2 of the outer diameter of the tube
The structure is characterized in that it is embedded in parallel with the pipe body at a position above the distance to.

The elastic plate used in the present invention is a plate having both compressibility, elasticity and resilience, and is preferably synthetic resin foam, rubber or the like. Lower elastic modulus (25-130kgf / c
m ² ) is preferable. As those having these properties, there are foamed polystyrene such as EPS (Expanded Poly-Styrol) block and foamed material of cross-linked polyethylene.

The elastic plate has a wall thickness of 20 to 70 cm.
It is preferable that the pressure is appropriately compressed, and it is preferable that the width be equal to or slightly longer than the outer diameter of the pipe, as shown in FIG. Soil b, c
It is preferable that the length be provided so as to be continuous in parallel with the tubular body.

In the present invention, the elastic plate member must be provided at a position above a distance of 1/5 to 3/2 of the outer diameter of the tube. By setting the elastic plate body at this distance, the soil b, c on the side of the tube body is preferably consolidated.

If the elastic plate body is closer to the pipe body than the position above the distance of ⅕ of the pipe diameter, when the pipe is buried so as to be hidden by the highly rigid base material, the elastic plate body is elastic in the highly rigid base material. When the plate body enters, the elastic plate body cannot be compressed, and the soil b and c on the side of the tube body is not consolidated.

When the elastic plate body is farther from the pipe body than the position above the distance of 3/2 of the pipe diameter, the pressure of the soil A above the elastic plate body causes the soil B on the side of the soil A above the elastic plate body. , To C,
The soil b, c on the side of the pipe body is not consolidated.

Further, in combination with the pipe laying structure of the present invention, laying an elastic body processed along the pipe shape on the upper surface of the pipe further prevents flattening and crushing of the pipe. It is preferable because it is possible.

As the pipe body to be buried, a synthetic resin pipe, a reinforced plastic concrete composite pipe, a concrete pipe, a cast iron pipe or the like is used, but it is not particularly limited. The shape of the cross section of the tubular body orthogonal to the tube axis may be any shape such as a circle, an oval, an ellipse, and a polygon close to a circle.

[0015]

In the pipe laying structure of the present invention, the pressure of the soil A above the elastic plate is directed toward the soil b and c on the side of the pipe by the compression of the elastic plate, so that the soil a below the elastic plate is Although the pressure applied to the soil decreases, the pressure applied to the soil b and c on the side of the tube increases, and the soil b and c on the side of the tube are consolidated. This compaction prevents the tube from flattening.

Further, the soil A above the elastic plate body sinks downward due to compression by the elastic force of the elastic plate body, but the soil B and C on the side of the soil A above the elastic plate body move in the same state. Since there is no frictional force, the reaction force received from B and C reduces the earth pressure on the pipe body. By reducing this earth pressure, flattening and crushing of the pipe can be prevented.

[0017]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a cross section of an embodiment of a pipe laying structure of the present invention. FIG. 2 shows a cross section of another embodiment of the elastic plate body used in the pipe laying structure of the present invention. FIG. 3 shows a prior art embodiment.

Reference numeral 1 is an elastic plate member having a rectangular cross section, which is arranged in parallel along the pipe member P and is a long plate-shaped EPS block styrofoam. The EPS block has an elastic modulus of 50 kgf / cm ² , and has super light weight, compressibility, high impact material properties, and homogeneity by mass production. The elastic plate body 1 has a thickness of 50 mm and a width of 950 mm.

The pipe body P is a reinforced plastic composite pipe having an outer diameter of 940 mm and a wall thickness of 30 mm. The elastic plate 1 is 1000 mm above the pipe top and 200 mm above the ground.
It is provided 0 mm below.

The construction sequence will be described. First, excavate the soil surface to form the excavated groove 4, and compact the ground of the groove bottom and the groove wall,
A required number of pipes P, P ... Which should be piped are arranged on top of them, and they are connected to each other. The base material 2 having high rigidity such as earth and sand or crushed stone is embedded around the connected pipe body P so as to be hidden above the pipe body up to a distance of about 1/5 of the pipe outer diameter from the pipe top. . Next, backfilling is performed to a predetermined height by a known method. At that time, the elastic plate body 1 is laid so as to be 1000 mm above the pipe top and 2000 mm below the ground.

Elastic plate members 11, 12, 13, 1 of another embodiment
4 is that the thickness of the central portion in the cross section orthogonal to the axial direction is made thicker than the both end portions, so that the pressure of the soil A above the elastic plate body goes from the central portion to both end portions, and The soil b and c can be easily approached, and the soil b and c on the side of the tube can be more easily consolidated.

In fact, when the present invention was applied, the soil b and c on the side of the pipe body was consolidated and strengthened, and the pipe body P was not flat.

[0023]

According to the laying structure of the pipe body of the present invention, the pressure of the soil A above the elastic plate body is directed toward the soil b and c on the side of the pipe body by the compression of the elastic plate body. While the pressure applied to the soil a decreases, the pressure applied to the soil b and c on the side of the tube increases, and the soil b and c on the side of the tube are consolidated. Therefore, it is not necessary to apply embankment to the soil surface on the side of the pipe body and wait until the soil b and c on the side of the pipe body are consolidated. Therefore, the tubular body is not flat.

Further, the soil A above the elastic plate body sinks downward due to compression by the elastic force of the elastic plate body, but the soil B and C on the side of the soil A above the elastic plate body move in the same state. Since there is no frictional force, the reaction force received from B and C reduces the earth pressure on the pipe body. Therefore, the tube is flat and does not collapse.

Further, unlike the prior art, the workability is excellent because it is not necessary to process the elastic body on the upper surface of the tubular body in accordance with the outer diameter of the tubular body so as to follow the tubular shape, and to process each tubular diameter. And, the tube diameter and shape of any tube can be used.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a pipe laying structure according to the present invention.

FIG. 2 is a cross-sectional view of another embodiment of an elastic plate body used in the pipe laying structure of the present invention.

FIG. 3 is a perspective view of a tubular body provided with a conventional elastic body.

[Explanation of symbols]

 1 elastic plate body 2 base material 4 open cut groove 15 elastic body processed according to tube shape

Claims (1)

[Claims] 1. An elastic plate body is provided at a position above the pipe top of the pipe body, which is buried in earth and sand, etc., at a distance of ⅕ to 3/2 of the pipe outer diameter. A pipe laying structure characterized by being embedded in parallel with a pipe.