The present invention relates to a protective member and a protective method.
it is known that a buried pipe for accommodating cables is used when various cables such as optical fibers and power transmission lines are buried in the ground. When the buried pipe is buried in the ground under a road or the like to form the buried pipe line, in a shallow layer section in which soil covering as a depth from the ground surface to the buried pipe cannot be sufficiently secured, there is a high risk that the buried pipe line is damaged from an excavating machine and the like such as a backhoe, a breaker or a cutter due to road construction or the like.
In order to prevent the damage of the buried pipe line in the shallow layer section, it is known that a sign sheet indicating that the buried pipe is buried is used, or an iron plate, a ceramic plate, or a metal plate is installed between the ground surface and the buried pipe (PTL 1 to 3).
[PTL 1] Japanese Patent Application Publication No. 2001-355758
[PTL 2] Japanese Patent Application Publication No. 2007-143355
[PTL 3] Japanese Patent Application Publication No. 2015-180166
However, in the conventional structure, a suitable space is required above the buried pipe, and since it is difficult to secure the separation from the ground surface to the buried pipe due to a structure of terrain, a stratum, or the like, there is a case where the buried pipe line cannot be protected appropriately.
An object of the present disclosure is to provide a protective member and a protective method capable of appropriately protecting a buried pipe line even when it is difficult to secure separation from a ground surface to a buried pipe.
A protective member according to one embodiment is a protective member for protecting cables, and includes an inclined steel material having an upper surface inclined to a horizontal surface above the cable, and an outer pipe that is a buried pipe for accommodating the cables and the inclined steel material.
A protective method according to one embodiment is a protective method for protecting cables, and includes steps of arranging the inclined steel material having the upper surface inclined to the horizontal surface above the cable, and accommodating the cables and the inclined steel material in the outer pipe that is the buried pipe.
According to the present disclosure, even when it is difficult to secure separation from the ground surface to the buried pipe, the buried pipe line can be appropriately protected.
Hereinafter, as embodiment of the present disclosure will be described with reference to drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals. In the description of the present embodiment, description of the same or corresponding parts will be appropriately omitted or simplified.
The present disclosure makes it possible to reduce a protective space more than a conventional configuration by constructing a protective structure in a buried pipe, and protect the buried pipe even when it is difficult to secure a separation (a depth) from a road surface.
The inner pipe 2 is the buried pipe for accommodating the cables 9. In the example shown in
The inclined steel material 3 is a steel material having an upper surface S inclined to the horizontal surface above the cable 9 and the inner pipe 2 for accommodating the cables 9. In
Since the upper surface S of the inclined steel material 3 is above the inner pipe for accommodating the cables 9, the cables 9 or the inner pipe can be prevented from directly receiving the impact from an upper part by the excavating machine or the like. Since the inclined steel material 3 has the upper surface S inclined to the horizontal surface, even if a cutting edge of the breaker, the cutter or the like is brought into contact with the inclined steel material 3, the cutting edge is deflected to prevent intrusion of the cutting edge into the inner pipe 2 and the cables 9. As shown in
The fixing jig 4 is a member for fixing the inclined steel material 3 to the outer pipe 7. The fixing jig 4 prevents the inclined steel material 3 from largely moving in the buried pipe line formed by the outer pipe 7. By providing the fixing jig 4, the inclined steel material 3 can be stably installed in the outer pipe 7. Accordingly, by fixing the inclined steel material 3 by the fixing jig 4, a load such. as impact and vibration to the inner pipe 2 and the cables 9 accommodated in the inner pipe 2 due to movement of the inclined steel material 3 can be reduced. The fixing jig 4 is provided not only in the whole buried pipe line but only in the connection part and the like of the buried pipe line, so that the installation cost can be reduced.
The fiber sheet 5 is a sheet-like fiber having high strength arranged on the upper surface S of the inclined steel material 3. The fiber sheet 5 prevents the cables 9 from being cut by entangling a rotary paving cutter with the fiber. When the fiber sheet 5 is fixed on the inclined steel material 3, the fiber sheet 5 is easily cut when the rotary paving cutter comes into contact with the inclined steel material 3. Therefore, when a rotary cutter comes into contact with the fiber sheet 5, the space 10 may be secured between the inclined steel material 3 and the outer pipe 7 so that the fiber sheet 5 can he moved so that the fiber is entangled with the cutter. The fiber sheet 5 can be constituted of any fiber having high strength, and may be constituted of, for example, aramid fiber or synthetic fiber mixed with aramid fiber.
The sheet protective material 6 is a member for preventing water absorption of the fiber sheet 5 and covering the surface of the fiber sheet 5. When the fiber sheet 5 absorbs water, the fiber sheet 5 is hardly entangled with the cutter intruded from the ground surface, and is easily cut by the cutter. The sheet protective material 6 wraps the fiber sheet 5 to prevent the fiber sheet 5 from absorbing water, thereby preventing the strength of the fiber sheet 5 from being lowered by water absorption. Further, the sheet protective material 6 is formed of a slippery material, so that the excavating machine or the like can be slid on the fiber sheet 5 even if the excavating machine or the like such as the cutter or the breaker intrudes. Therefore, the sheet protective material 6 assists a function of deflecting the edge of a cutter or the like by the inclined upper surface S of the inclined steel material 3. The sheet protective material 6 can be constituted of any material which does not allow water to pass through, and may be constituted of, for example, polyvinylidene chloride or low density polyethylene.
The outer pipe 7 is the buried pipe accommodating the cables 9, the inner pipe 2 for accommodating the cables 9, the inclined steel material 3, the fixing jig 4, the fiber sheet 5, and the sheet protective material 6. In the example shown in
In the protective member 1a shown in
Since the inclined steel material 3 is located above the inner pipe 2 accommodating the cables 9, the cables 9 or the inner pipe 2 can be prevented from directly receiving the impact from the upper part by the excavating machine or the like. In
Although
In the protective member 1b, unlike the protective member 1a, not only the outer pipe 7 but also the inner pipe 2 have the split pipe structure, and the installation is facilitated. The inclined steel material 3 has the chevron-shaped cross section of an equal side. In the protective member 1b, the fixing jig 4 for fixing the inclined steel material 3 to the outer pipe 7 is provided not only in the whole buried pipeline but also only in the connection part of the buried pipeline or the like in order to reduce the cost.
The buffer material 8 is a member for relaxing the impact to the inner pipe 2 from the excavating machine or the like to prevent the inner pipe 2 and the cables 9 from being damaged. The buffer material 8 is arranged between the inner pipe 2 and the inclined steel material 3, and can absorb the impact from the upper part. The buffer material 8 may be fixed to at least one of the inner pipe 2 and the inclined steel material 3 in order to keep the inclination of the inclined steel material 3 against the impact from the upper part. The buffer material 8 can be constituted of any material absorbing impact, and may be constituted of, for example, rubber, sponge, or the like. The buffer material 8 may be provided not only to the inclined steel material 3 having the chevron-shaped. cross section but also to the inclined steel material 3 having an arbitrary shape.
In a step S1, the cables 9 is accommodated in the inner pipe 2. As the inner pipe 2, one having the split pipe structure may be used.
In a step S2, the inclined steel material 3 is arranged so that the upper surface S of the inclined steel material 3 is positioned above the inner pipe 2. When the inclined steel material 3 has the hollow part 11 shown in
In a step S3, the fiber sheet 5 having high strength is arranged on the upper surface S of the inclined steel material 3. The surface of the fiber sheet 5 may be covered with the sheet protective material 6.
In a step S4, the inclined steel material 3 on which the inner pipe 2 for accommodating the cables 9 and the fiber sheet 5 are arranged are accommodated in the outer pipe 7. When the inclined steel material 3 is accommodated, the inclined steel material 3 may be fixed to the outer pipe 7 by the fixing jig 4. As the outer pipe 7, one having the split pipe structure may be used.
The protective member 1 having the protective structure for protecting the cables 9 can be constituted by the above steps. In this case, the order of the steps described above may be changed.
In each embodiment of the present disclosure, by constructing a protective structure in the outer pipe 7 of the protective member 1, it is not necessary to provide another member between the ground surface and the outer pipe 7, and the cables 9 can be protected from the excavating machine or the like. Therefore, the protective member 1 can be applied even when it is difficult to secure separation from the road surface, and space saving of the upper part of the buried pipe can be achieved.
In the protective member 1, the inclined steel material 3 having the upper surface S inclined to the horizontal surface H is installed above the inner pipe 2 accommodating the cables in the outer pipe 7. Thus, the protective member 1 can protect the cables 9 by deflecting the impact from the upper part and preventing the impact from being directly transmitted to the inner pipe 2 for accommodating the cables 9. Further, the fiber sheet 5 having high strength may be arranged on the upper surface of the inclined steel material 3. The cables 9 can be protected from the paving cutter or the like by entangling the fiber sheet 5 having high strength with the paving cutter or the like. Therefore, each embodiment of the present disclosure can appropriately protect the buried pipe line even if it is difficult to secure separation from the ground surface to the buried pipe with a large risk of damage due to the excavating machine or the like.
Further, by constituting at least either the inner pipe 2 or the outer pipe 7 into the split pipe structure, not only the protective member 1 can be easily newly installed but also the accommodated object can be partially replaced at the time of repair. Therefore, workability is improved by using the inner pipe 2 or the outer pipe 7 having the split pipe structure.
The present disclosure is not limited to the embodiment described above. Instead of executing a plurality of steps of processing described in the flowchart in a time-series manner according to the described order, the steps of processing may be executed in parallel or a different order depending on the processing ability of a device that executes the processing or as necessary, for example. Besides this, the present disclosure may be changed without departing from the spirit of the present disclosure.
1, 1a, 1b Protective member
2 Inner pipe
2
a Upper part of the inner pipe
2
b Lower part of the inner pipe
3
a to 3f Inclined steel material
4 Fixing jig
5 Fiber sheet
6 Sheet protective material
7 Outer pipe
7
a Upper part of the outer pipe
7
b Lower part of the outer pipe
8 Buffer material
9 Cable
10 Space
11 Hollow part of the inclined steel material
Filing Document | Filing Date | Country | Kind |
---|---|---|---|
PCT/JP2020/038036 | 10/7/2020 | WO |