JP2021078325A - Underground cable edging device and underground cable removal method - Google Patents

Abstract

To provide an underground cable edging device and an underground cable removal method that can efficiently cut edges of soil and an underground cable in a trough and suppress diffusion of oil in the underground cable even when oil in the underground cable leaks.SOLUTION: A underground cable edging device (edging device 100) according to the present invention that cuts edges of soil and an underground cable 14 in a trough 12 in order to remove the underground cable 14 passing through the trough 12 includes a head 110 having a cylindrical portion 112 through which the underground cable 14 is inserted, and a hollow rod 120 for propelling the head 110, and the head 110 injects air forward through the hollow rod 120.SELECTED DRAWING: Figure 1

Description

The present invention relates to an underground cable edging device that cuts off the soil and the underground cable in the trough in order to remove the underground cable passing through the trough, and an underground cable removing method using the same.

In recent years, underground wiring has become widespread from the viewpoint of consideration for the landscape and safety in the city. In underground wiring, troughs and pipelines are buried in the ground, and power cables, communication cables, etc. (hereinafter referred to as underground cables) are laid inside the troughs and pipelines. Underground cables are removed when they deteriorate over time or when they are no longer needed.

For example, Patent Document 1 discloses a power cable removal method for removing an underground cable in a trough. In Patent Document 1, a work shaft is excavated from the ground surface at both ends of a trough in which a power cable is embedded, and both ends of the power cable to be removed are cut in the work shaft. Then, after breaking the filled sand in the trough by injecting high-pressure water, the power cable in the trough is pulled out.

Japanese Unexamined Patent Publication No. 2006-74939

In troughs, buried materials (soil, sand, etc.) are filled around underground cables. Underground cables generate heat during power transmission. At this time, the buried material functions as a heat transfer material for dissipating heat. Further, the generated underground cable extends and tries to meander due to the temperature rise, and at this time, the buried material also serves as a support member for suppressing the meandering. On the other hand, since the buried material is compressed while being heated, it solidifies in the trough, and the solidified buried material sticks to the underground cable. Then, the frictional resistance increases, and it becomes difficult to pull out the underground cable.

Therefore, when pulling out the underground cable laid in the trough, first, the edge cutting process between the buried material in the trough and the underground cable is performed. For example, the underground cable and the buried material can be cut off by injecting high-pressure water as in Patent Document 1. However, the work of sucking the wastewater while injecting high-pressure water into the trough takes a long propulsion time, so that the work takes a long time. Further, when the underground cable is an OF cable, if the oil inside the cable leaks, the oil is diffused to the surroundings by the high pressure water.

In view of such a problem, the present invention can efficiently perform the edge cutting work of the soil and the underground cable in the trough, and suppress the diffusion of the oil in the underground cable even if it should leak. It is an object of the present invention to provide a possible underground cable edging device and an underground cable removal method.

In order to solve the above problems, a typical configuration of the underground cable edging device according to the present invention is to cut the soil and the underground cable in the trough in order to remove the underground cable passing through the trough. The cable edge cutting device includes a head having a cylindrical portion through which an underground cable is inserted, and a hollow rod for propelling the head, and the head is characterized in that air is injected forward through the hollow rod.

According to the above configuration, the air injected from the head cuts off the soil in the trough and the underground cable. At this time, since a liquid such as high-pressure water is not used, the work of collecting wastewater becomes unnecessary. It is possible to efficiently cut the edges of soil and underground cables in the trough. Further, since a liquid such as high-pressure water is not used, even if the oil in the underground cable should leak, its diffusion can be suppressed.

The head may also inject air diagonally downward behind. This makes it possible to guide the soil peeled off by edge cutting to the bottom of the underground cable. Therefore, it is possible to suitably prevent the underground cable that has been trimmed from being buried in the soil.

In order to solve the above problems, a typical configuration of the underground cable removal method according to the present invention is to pull out the underground cable after cutting the underground cable and the soil using the above-mentioned underground cable edging device. It is a feature. The components and explanations corresponding to the technical idea of the underground cable removal pipe described above can also be applied to the underground cable removal method.

According to the present invention, the underground cable can efficiently perform the edge cutting work of the soil and the underground cable in the trough, and can suppress the diffusion of the oil in the underground cable even if it should leak. Edge cutting devices and underground cable removal methods can be provided.

It is a figure explaining the underground cable edge cutting device which concerns on this embodiment. It is a figure explaining the underground cable removal method of this embodiment. FIG. 2B is a sectional view taken along the line BB of FIG. 2B.

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The dimensions, materials, other specific numerical values, etc. shown in the embodiment are merely examples for facilitating the understanding of the invention, and do not limit the present invention unless otherwise specified. In the present specification and drawings, elements having substantially the same function and configuration are designated by the same reference numerals to omit duplicate description, and elements not directly related to the present invention are not shown. To do.

FIG. 1 is a diagram illustrating an underground cable edge cutting device (hereinafter, referred to as an edge cutting device 100) according to the present embodiment. 1 (a) is an overall view of the edge cutting device 100, and FIG. 1 (b) is a cross-sectional view of FIG. 1 (a) from the A direction. As shown in FIG. 1 (b), at the work site 10, a trough 12 is buried in the ground under the road surface, and an underground cable 14 is laid inside the trough 12.

Since the trough 12 is filled with the buried material 18 (for example, soil), the circumference of the underground cable 14 is covered with the buried material 18. A lid 16 is provided on the upper surface of the trough 12. In the underground cable removal method of the present embodiment, the soil and the underground cable 14 which are the buried material 18 in the trough 12 are trimmed by the edge cutting device 100, and the underground cable 14 passing through the trough 12 is removed.

As shown in FIG. 1A, the edge cutting device of this embodiment includes a head 110 and a hollow rod 120. The head 110 has a cylindrical portion 112 through which the underground cable 14 is inserted, and a connecting portion 114 that connects the cylindrical portion 112 and the hollow rod 120. The hollow rod 120 is connected to the cylindrical portion 112 via the connecting portion 114 and propels the head 110.

Specifically, the hydraulic cylinder 130 is connected to the hollow rod 120 of the edge cutting device 100. A propulsive force is applied to the hydraulic cylinder 130 by the hydraulic compressor 140, and the edge cutting device 100 propels the inside of the trough 12 by the hydraulic cylinder 130. An air compressor 150 is connected to the hollow rod 120 of the edge cutting device 100, and air is supplied from the air compressor 150 to the edge cutting device 100.

FIG. 2 is a diagram illustrating an underground cable removal method (hereinafter referred to as a removal method) of the present embodiment. FIG. 3 is a cross-sectional view taken along the line BB of FIG. 2 (b). In the removal method of the present embodiment, the underground cable 14 is inserted through the cylindrical portion 112 as shown in FIG. 2 (a). Then, while propelling the head 110 via the hollow rod 120 by the propulsive force from the hydraulic cylinder 130, the air supplied to the head 110 via the hollow rod 120 is ejected forward from the front injection hole 112a.

According to the above configuration, the buried material 18 in the trough 12 and the underground cable 14 are cut off by the air injected from the head 110. By using air at the time of edge cutting in this way, the work of collecting the wastewater when a liquid such as high-pressure water is used becomes unnecessary. Therefore, the edge cutting work of the buried material 18 such as soil in the trough 12 and the underground cable 14 can be efficiently performed.

Further, since a liquid such as high-pressure water is not used, even if the oil in the underground cable 14 should leak, its diffusion can be suppressed. Then, as shown in FIG. 2B, when the buried material 18 in the trough 12 and the underground cable 14 are cut off, the underground cable 14 is pulled out from the trough 12 and removed.

Further, in the present embodiment, as shown in FIGS. 1 and 2, the head 110 also has a rear injection hole 112b formed behind the cylindrical portion 112, and injects air obliquely downward from the rear injection hole 112b. .. As a result, as shown in FIG. 3, the buried material 18 peeled off by edge cutting can be guided to the gap below the lifted underground cable 14. Therefore, it is possible to preferably prevent the edge-cut underground cable 14 from falling into the gap again and being buried in the buried material 18.

Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modifications or modifications within the scope of the claims, which naturally belong to the technical scope of the present invention. Understood.

INDUSTRIAL APPLICABILITY The present invention can be used in an underground cable edging device that cuts the edge of the soil and the underground cable in the trough in order to remove the underground cable passing through the trough, and an underground cable removing method using the device. ..

10 ... Work site, 12 ... Trough, 14 ... Underground cable, 16 ... Lid, 18 ... Buried material, 100 ... Edge cutting device, 110 ... Head, 112 ... Cylindrical part, 112a ... Front injection hole, 112b ... Rear injection hole , 114 ... Connecting part, 120 ... Hollow rod, 130 ... Hydraulic cylinder, 140 ... Hydraulic compressor, 150 ... Air compressor

Claims (3)

In an underground cable edging device that rims the soil and underground cables in the trough to remove the underground cables that pass through the trough.
A head having a cylindrical portion through which the underground cable is inserted,
A hollow rod that propels the head,
With
The head is an underground cable edging device characterized in that air is injected forward through the hollow rod. The underground cable edging device according to claim 1, wherein the head also injects air obliquely downward behind. An underground cable removal method, characterized in that the underground cable and the soil are trimmed using the underground cable edging device according to claim 1 or 2, and then the underground cable is pulled out.

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