JP2020162214A - Cable support structure - Google Patents

Abstract

To make lightweight and hard to corrode a cable support structure which supports a cable while being suspended from a structure.SOLUTION: A cable support structure comprises: multiple support poles 1 of which the upper ends are fixed to a structure; receiving members 2 attached to lower ends of the support poles 1; and a cable support member 3 which is attached while being placed over the receiving members 2. The support poles 1, the receiving members 2 and the cable support member 3 are all formed from FRP-based materials (FRP mold, FRPM pipe or FRPM plate), such that the cable support structure is made lightweight and hard to corrode in comparison with a cable support structure in which these members are formed from metals.SELECTED DRAWING: Figure 1

Description

The present invention relates to a cable support structure that supports a cable laid in a tunnel or the like.

When laying a cable, a cable support member including a member called a cable cleat is generally used to support the cable in a meandering state as a measure against thermal expansion and contraction of the cable. The cable cleats are installed at predetermined intervals in the cable laying direction and are supported by sandwiching the cable between the two divided members, and are often made of metal (see, for example, Patent Document 1).

Jikkai Sho 62-61120

By the way, when laying a cable in a structure such as a tunnel using a cable cleat as described above, the cable should be placed along the ceiling of the structure in order to secure as much space as possible in the structure. May be placed. In that case, since the cable is supported by the cable support structure suspended from the ceiling of the structure, it is desirable that the total weight of the cable support structure be as small as possible.

Further, when the metal cable support structure is used for cable laying in an undersea tunnel, for example, there is a concern that the cable may be corroded at an early stage due to the cable laying environment.

Therefore, it is an object of the present invention to make a cable support structure that supports a cable suspended from a structure lightweight and resistant to corrosion.

In order to solve the above problems, the present invention has a cable support structure that supports a cable laid along the structure while being suspended from the structure, and the upper end thereof is fixed to the structure. A plurality of columns, a receiving member attached to the lower end of each of the columns, and a cable supporting member attached while being mounted on the receiving members, among the columns, receiving members, and cable supporting members. At least one of the members is made of a material mainly made of fiber reinforced plastic (FRP).

That is, by forming at least one of the support column, the receiving member, and the cable support member constituting the cable support structure from the material mainly composed of FRP, the cable support structure is lightweight as a whole and is not easily corroded. It was made to be.

Here, as a specific configuration, the cable support member includes two longitudinal members that are supported by the respective receiving members and extend in parallel with each other along the cable laying direction, and a plurality of the longitudinal members in the longitudinal direction. It is possible to adopt a base member that is connected at a location and a cable cleat that is rotatably attached to each of the base members while passing the cable.

As described above, the cable support structure of the present invention is formed by forming at least one of a support, a receiving member, and a cable support member, which are the main constituent members thereof, from a material mainly composed of FRP. Therefore, it is lightweight as a whole and is suitable for supporting the cable while being suspended from the structure. In addition, since the members formed of FRP are less likely to corrode, the cables are supported in an environment that is easily corroded, such as in an undersea tunnel, by making all three types of members, the strut, the receiving member, and the cable support member, made of FRP. Can be suitable for.

External perspective view of the cable support structure of the embodiment Front view of FIG. Sectional view taken along line III-III of FIG. Sectional view taken along line IV-IV of FIG. Top view of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. This cable support structure supports a cable laid along the ceiling of a structure such as a tunnel while being suspended from the ceiling of the structure, and as shown in FIG. 1, a plurality of columns. 1, a receiving member 2 attached to the lower end of each support column 1, and a cable support member 3 attached while being mounted on each receiving member 2. The three types of members, the support column 1, the receiving member 2, and the cable support member 3, are all made of a material mainly composed of FRP.

As shown in FIGS. 1 to 3, the pillar 1 includes a pillar main body 11 and a base plate 12 connected to an upper end portion of the pillar main body 11. The pillar body 11 is an FRPM pipe (fiber reinforced resin mortar composite pipe) having a resin mortar layer between the FRP layers on the inner peripheral side and the outer peripheral side, and the base plate 12 is a press-molded product of FRP.

The base plate 12 has a square plate-shaped base portion 12a, a cylindrical mounting portion 12b provided in the center of the lower surface of the base portion 12a, and a triangular plate-shaped base plate 12b formed from the outer circumference of the mounting portion 12b to each side of the base portion 12a. It is composed of a plurality of reinforcing ribs 12c. Then, with the four corners of the base portion 12a fixed to the structure with anchor bolts A, the upper end portion of the pillar body 11 is inserted into the mounting portion 12b, and the bolts are screwed into the pillar body 11 from the outer peripheral side of the mounting portion 12b. As a result, the upper end of the column 1 is fixed to the structure.

The receiving member 2 includes a pair of connecting plates 21 that sandwich the lower end portion of the column 1 in the radial direction, and a ladder receiving pipe 22 that extends in the radial direction of the column 1 with one end supported by both connecting plates 21. It includes a rudder receiver 23 fixed to the other end of the rudder receiver pipe 22. The connection plate 21 and the rudder receiving 23 are FRP press-molded products, and the rudder receiving pipe 22 is an FRPM pipe similar to the pillar body 11 of the column 1.

In the connection plate 21, a semi-cylindrical mounting portion 21a having a step formed in the central portion in the longitudinal direction and a semi-cylindrical supporting portion 21b having a convex side surface in the same direction as the mounting portion 21a are connected in an inverted T shape. (See FIG. 3), a rectangular receiving plate portion 21c projecting from the boundary portion between the mounting portion 21a and the supporting portion 21b to the convex side, and both ends of the receiving plate portion 21c to the convex side surface of the supporting portion 21b are formed. It has a triangular plate-shaped reinforcing rib 21d. The receiving plate portion 21c plays a role of mounting the cable support member 3 in the same manner as the rudder receiving 23 as described later.

By arranging the pair of connection plates 21 so that the respective mounting portions 21a sandwich the lower end portion of the pillar body 11 of the column 1 in the radial direction, and screwing a bolt from the convex side surface of each mounting portion 21a into the pillar body 11. , Each connection plate 21 is fixed to the lower end of the support column 1. It should be noted that the bolt holes of the mounting portions 21a of each connection plate 21 are provided at a plurality of positions in the axial direction so that the mounting position of the connection plate 21 to the support column 1 can be adjusted in the vertical direction.

One end of the rudder receiving pipe 22 is inserted into a circular hole formed between the support portions 21b of the pair of connection plates 21, and is bolted from the convex side surface of each support portion 21b. On the other hand, a ladder receiver 23 for mounting the cable support member 3 is attached to the other end of the ladder receiving pipe 22 as described later.

The rudder receiving 23 is integrated with the inverted U-shaped mounting portion 23a that fits in the upper half of the outer periphery of the rudder receiving pipe 22 and the upper surface side of the mounting portion 23a, and is orthogonal to the axial direction of the rudder receiving pipe 22. It consists of a rectangular receiving plate portion 23b extending in the direction and a reinforcing plate 23c that closes one side of the mounting portion 23a and reinforces the receiving plate portion 23b, and the other end of the ladder receiving pipe 22 from the outer surface side of the mounting portion 23a. By screwing a bolt into the portion, it is fixed to the rudder receiving pipe 22.

The cable support member 3 is a base that is supported by each receiving member 2 and connects two ladders 31 as longitudinal members extending in parallel with each other along the cable laying direction and the ladders 31 at a plurality of locations in the longitudinal direction. It includes a rectangular plate-shaped cleat base 32 and a cable base 33 as members, and a main line cable cleat 34 and a return line cable cleat 35 attached to each cleat base 32. The rudder 31 is a pultruded product of FRP, and the cleat base 32 and the cable base 33 are FRPM plates having a resin mortar layer between the FRP layers on the upper surface side and the lower surface side. The cable cleats 34 and 35 are also made of FRP.

The two rudder 31s are formed in an L-shaped cross section, and the lateral mounting portions 31a face each other, and the receiving plate portions 21c or the ladder receiving portion of the connecting plate 21 of the receiving member 2 are received at a plurality of positions in the longitudinal direction. It is placed on the receiving plate portion 23b of 23 and fixed with bolts. Then, one end of each of the cleat base 32 and the cable base 33 is mounted on the mounting portion 31a of one ladder 31, and the other end is mounted on the mounting portion 31a of the other rudder 31 and fixed by bolts. As shown in FIG. 4, FRPM liner plates 36 for raising are sandwiched between both ends of the cable base 33 and the mounting portions 31a of the rudder 31.

The cleat base 32 is rotatably attached in a predetermined angle range clockwise from the direction in which the cable cleats 34 and 35 are orthogonal to the rudder 31 in a plan view, and is rotatably attached in a predetermined angle range counterclockwise. Are alternately arranged in the longitudinal direction of the rudder 31 (see FIG. 5).

The main line cable cleat 34 is composed of upper and lower cleat pieces 34a and 34b each having a semicircular groove, and the main line cable C1 is formed in a circular hole formed by abutting the respective semicircular grooves on both cleat pieces 34a and 34b. It is integrated in a passing state, and the lower cleat piece 34b is rotatably attached to the cleat base 32. Further, the return cable cleat 35 has the same structure as the main line cable cleat 34, and the upper and lower cleat pieces 35a and 35b are integrated in a state of passing through the return cable C2, and the lower cleat piece 35b Is rotatably attached to the cleat base 32. Then, the cable cleats 34 and 35 are fixed to the cleat base 32 in a posture of alternately rotating in the opposite directions in the longitudinal direction of the rudder 31.

This cable support structure has the above configuration, and in a state of being suspended from the ceiling of the structure, the main line cable C1 and the return line cable C2 are connected to the main line cable cleat 34 and the return line cable cleat 35, respectively. By passing it over the cable base 33, it is supported in a meandering state (see FIG. 5).

Since all the members (support 1, receiving member 2, and cable supporting member 3) are made of a material mainly composed of FRP, the weight as a whole is lightweight and resistant to corrosion. Therefore, it is suitable for supporting a cable in a state of being suspended from a structure, and can be stably used for a long period of time even in a corrosive environment such as in an undersea tunnel.

The cable support structure can be installed in a structure other than a tunnel, and for example, it may be installed on the back surface of an elevated highway. When installed in an environment where there is little risk of corrosion, not all members need to be made of FRP-based material, and as many members as possible are made of FRP-based material for weight reduction. You can do it like this.

It should be considered that the embodiments disclosed this time are exemplary in all respects and not restrictive. The scope of the present invention is indicated by the scope of claims, not the above-mentioned meaning, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

For example, in the above-described embodiment, the cable support member 3 is installed on one side of the column 1, but the cable support members may be installed on both sides of the column.

1 Pillar 2 Receiving member 3 Cable support member 11 Pillar body 12 Base plate 21 Connection plate 22 Ladder receiving pipe 23 Ladder receiving 31 Ladder (longitudinal member)
32 Cleat base (base member)
33 Cable base (base member)
34, 35 Cable Cleat C1 Main line cable C2 Return line cable

Claims (2)

In a cable support structure that supports cables laid along a structure while suspended from the structure.
The support is provided with a plurality of columns whose upper ends are fixed to the structure, a receiving member attached to the lower end of each column, and a cable support member attached while being mounted on each receiving member. A cable support structure, characterized in that at least one of the receiving member and the cable supporting member is made of a material mainly made of fiber reinforced resin. The cable support member is supported by each of the receiving members, and two longitudinal members extending in parallel with each other along the cable laying direction, a base member connecting the longitudinal members at a plurality of locations in the longitudinal direction, and the above. The cable support structure according to claim 1, further comprising a cable cleat that is rotatably attached to each of the base members while passing a cable.

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