JPH10299946A - Bolster base for piping - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of ground subsidence or the like in a buried place by providing the upper and lower faces of a long-sized block with circular grooves corresponding to the outer peripheral surface of a protective pipe, and forming a recessed part and a protruding part to be fitted to each other, at both end parts in a bolster base used at the time of laying a plurality of underground cable protective pipes. SOLUTION: A boslter base A is formed of a long-sized block body 1 and integrally formed of synthetic resin or the like. In this case, circular grooves 11 are formed in the upper and lower faces of the block body 1. Communicating grooves 12 are formed in the center parts of the respective upper and lower circular grooves 11, and a plurality of grooves 13 intersecting the communicating grooves 12 are formed. A recessed part 14 and a protruding part 15 are formed at both ends of the block body 1, and the end parts of the bolster bases A can be connected to each other by these recessed and protruding parts 14, 15. At the time of laying protective pipe P, the bolster bases A are longitudinally laid in line inside a piping ditch formed by excavating the ground, and after connecting the end parts of the respective bolster bases A the protective pipes P are placed in the circular grooves 11, and the bolster bases A are set on the upper faces of the protective pipes P.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for burying electric wires, communication cables and the like in the ground, in which backfilling can be performed easily and reliably, and ground subsidence or the like may occur at the buried place. Not about the pillow bed for plumbing

[0002]

2. Description of the Related Art Conventionally, when an electric wire, a communication cable, and the like are buried underground, a pair of piping pillows is used to support an underground cable protection tube, and the protection tube is used to support the electric wire and communication cable. Cable and the like were inserted. FIG. 5 shows an example of a pillow bed used in the conventional method. An upper surface of the pillow bed 5 has a substantially semicircular arc groove 51 corresponding to the outer peripheral surface of the protective tube P.
Is provided. When the protective tube P is laid using the pair of pillows 5, 5, the protective tube P is placed in the arc groove 51 of one pillow P, and the other pillow 5 is turned upside down and assembled from above. . Then, as shown in FIG. 6, a plurality of protective tubes P are laid up, down, left and right, and then backfilling of excavated earth and sand is performed.

[0003]

However, in the conventional pillow bed, since the underground cable protection tube P is supported at predetermined intervals by the pillow bed 5, when backfilling earth and sand as shown in FIG. There is a problem that the backfilling work of putting earth and sand or the like into the space S of the protection pipe P piped up, down, left and right is troublesome and time-consuming. In addition, when backfilling the soil and the like, the soil and the like do not spread to the space S, and if the compaction is not sufficiently performed, irregularity occurs. There has been a problem in that it is partially bent and damaged, and land subsidence occurs during an earthquake or the like.

[0004] The present invention has been made to solve the above problems, and when burying electric wires, communication cables and the like in the ground,
An object of the present invention is to provide a pipe bed rest that can easily perform backfilling work and that does not cause land subsidence or the like at the buried place.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a pillow bed used for laying a plurality of underground cable protection pipes in a pipe groove formed by excavating the ground. -A substantially semi-circular arc groove corresponding to the outer peripheral surface of the protection tube is provided on the upper and lower surfaces of the long block having a width dimension substantially equal to the diameter of the bull protection tube, and both ends of the long block are mutually opposed. It is characterized in that irregularities which can be fitted to are formed.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view of a pillow stand showing one embodiment of the present invention, FIG. 2 is a sectional view taken along line XX of FIG. 1, FIG. 3 is a front view of the pillow stand, and FIG. It is a perspective view in the state where the underground cable protection tube was laid, and the code | symbol A in the figure is a pillow stand, and P is an underground cable protection tube.

The pillow bed A of the present invention comprises a long block 1, which is formed by injecting a synthetic resin such as PVC or polyethylene, a foamed resin, or a waste plastic into a mold. It is integrally molded. Usually, the block body 1 is set to a fixed length of 50 to 150 mm, and a substantially semi-circular arc groove 11 corresponding to the outer peripheral surface of the protective tube P is formed on the upper and lower surfaces of the block body 1. Have been. A communication groove 12 that is continuous in the longitudinal direction is formed at the center of each of the upper and lower arc grooves 11.
The groove 13 is formed so as to intersect and communicate with 2 at a desired angle such as 45 °, 60 °, 90 ° or the like.

The communication groove 12 and the groove 13 have a width of 5 to 2
.. Can be set to be 0 mm and a depth of 3 to 20 mm.
mm is preferable. When the communication groove 12 and the groove 13 are formed in the arc groove 11 in this manner, a gap is formed between the pillow base A and the protection tube P, so that the ventilation is good, so that the gasket was inserted into the protection tube P. When the electric wire, the communication cable, and the like generate heat, heat is radiated smoothly. Further, when groundwater or the like stays on the upper surface of the arc groove 11, the groundwater or the like is smoothly discharged to the end side of the block body 1 through the communication groove 12 and the groove 13. In some cases, projections may be provided at predetermined intervals in the arc groove 11 instead of the communication groove 12 and the groove 13.

On the other hand, a concave portion 14 and a convex portion 15 which can be fitted to each other are formed at both ends of the long block body 1, and the concave portion 14 and the convex portion 15 are fitted to each other so as to be sequentially arranged in the longitudinal direction. The end portions of the pillow beds A, A laid out side by side can be connected. In this connection state, the communication grooves 12 formed at the center of the arc groove 11 of each block body 1 communicate with each other.

Next, a method for laying a protective tube using the bed rest of the present invention will be described. First, the ground is excavated to form a groove for piping, and the bottom is sunk and flattened. Therefore, the pillow tables A are laid in the width direction at the bottom of the pipe groove, and the pillow tables A are also laid in the longitudinal direction, and the ends of the respective pillow tables A are fitted and connected. Next, as shown in FIG. 4, the protection tube P is placed in the circular arc groove 11 of the pillow base A, the pipes are connected to each other, and then the pillow base A is set on the upper surface of the protection tube P. This construction work is sequentially repeated, and a plurality of protective tubes P are laid in a plurality of upper and lower stages, and then backfilling of earth and sand is performed. Finally, an electric wire, a communication cable, and the like are inserted into the protective tube P opened at the end of the backfilled portion.

[0011]

As described in detail above, the pillow stand of the present invention has irregularities which can be mutually fitted to both ends of a long block having a width substantially equal to the diameter of the underground cable protection tube. Since the pillow beds are formed, the pillow bases can be laid one after another in the longitudinal direction and connected. For this reason, the entire lower surface of the protective tube is supported by the pillow, and the back surface of the protective tube does not become uneven when backfilling with earth and sand, so that the construction work can be performed easily and reliably. Further, when a wheel load is applied after the burial, the protective tube is not partially bent and damaged, and no land subsidence occurs at the time of an earthquake or the like.

In the pillow stand of the present invention, since a communication groove is formed in the arc groove to form a ventilation gap between the pillow stand and the protection tube, an electric wire, a communication cable, etc. inserted in the protection tube. Even if heat is generated, heat is radiated smoothly. Furthermore, even if groundwater or the like stays on the upper surface of the bed, the groundwater or the like is smoothly discharged through the communication groove formed in the circular arc groove. There is no softening or ground subsidence.

[Brief description of the drawings]

FIG. 1 is a plan view of a pillow stand showing one embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX of FIG.

FIG. 3 is a front view of a bed rest.

FIG. 4 is a perspective view showing a state in which an underground cable protection tube is laid using the bed rest of the present invention.

FIG. 5 is a front view showing a conventional bed rest.

FIG. 6 shows a plurality of underground cables using a conventional bed rest.
It is a front view which shows the state which laid the bull protection tube.

FIG. 7 shows a plurality of underground cables using a conventional pillow bed;
It is a side view which shows the state which laid the bull protection tube.

[Explanation of symbols]

 Reference Signs List 1 long block body 11 arc groove 12 communication groove 13 groove A pillow bed P underground cable protection tube

Claims (2)

[Claims] A pillow bed used for laying a plurality of underground cable protection pipes (P) in a pipe groove formed by excavating the ground, the diameter of the protection pipe (P). A substantially semi-circular arc groove (1) corresponding to the outer peripheral surface of the protective tube (P) is formed on the upper and lower surfaces of the long block body (1) having a width substantially equal to
(1) A pillow bed for piping characterized by having irregularities (14, 15) which can be fitted to each other at both ends of a long block body (1). 2. An arcuate groove (11) is formed with a communication groove (12) continuous in the longitudinal direction, and said communication groove (12) is formed.
2. A pillow bed for piping according to claim 1, wherein a groove (13) is formed so as to intersect and communicate with the pipe at a predetermined angle.