JP7555071B2 - Equipment shared cable rack - Google Patents

Description

The present invention relates to a cable rack that is installed inside a tunnel and holds various cables.

Patent Document 1 discloses a steel ladder-shaped cable rack in which parent girders are arranged on both the left and right sides facing each other and connected to each other by child girders at multiple locations spaced apart along the length of the parent girders.

Patent document 2 also discloses a method for laying a cable rack inside a tunnel. The cable rack includes a rack body that holds various cables such as power cables and light control cables, and the rack body includes a pair of parent girders that extend along the vehicle travel direction inside the tunnel, and multiple child girders that are installed at approximately equal intervals between the parent girders. The support member that supports the rack body includes a mounting section that has mounting holes through which anchor bolts provided on the side wall of the tunnel are inserted, and a placement section (installation section) that extends and bends from the mounting section.

Multiple rack bodies are provided on the installation section so as to extend along the vehicle travel direction. The installation section is equipped with a bolt whose tip is curved into an inverted U-shape, and the rack body is fixed to the support member by engaging and fastening the tip of the bolt to the parent girder.

JP 2017-134759 A JP 2012-146612 A

Multiple parent girders were installed on the installation section so as to extend in the direction of vehicle travel, and their ends were connected together via bolts or connecting plates. For example, when parent girders were connected together with bolts, typically two bolts were used for each parent girder in a pair of parent girders. In other words, four bolts are used to connect a pair of parent girders. In this case, the same number of nuts and washers are used as the bolts. When connecting parent girders together inside a tunnel with bolts, the bolts must be tightened one by one, which was cumbersome.

Therefore, the object of the present invention is to provide a cable rack with a simple structure and improved workability.

The first characteristic configuration of the cable rack of the present invention for achieving the above-mentioned object is that it comprises a single long parent girder laid inside a tunnel, and child girders arranged at multiple locations spaced apart along the longitudinal direction of the parent girder and capable of holding cables, and the parent girder is configured to comprise, in a cross-sectional view perpendicular to the longitudinal direction of the parent girder, an upper surface mounting portion on which the child girders are placed, a pair of side portions hanging down from both ends of the upper surface mounting portion, and a pair of lower flange portions bent inward from the lower ends of the side portions and arranged opposite each other with a gap between them .

According to this configuration, since the cable rack is made up of only one parent girder, it is possible to provide a cable rack with a simple structure. Also, since the cable rack is made up of only one parent girder, when connecting parent girders to each other, it is only necessary to connect one parent girder, which improves workability.
Furthermore, according to this configuration, the pair of lower flange portions can be configured in a rail shape, so that members such as a fixing tool described below can be slid along the pair of lower flange portions.

A second characteristic configuration of the cable rack according to the present invention is that it comprises a fixing device that fixes the cable rack to an installation portion for installing the cable rack, and the fixing device comprises a fixing device plate member that can slide between a pair of lower flange portions, a fixing device bolt member that passes through the fixing device plate member, and a fixing device nut member that screws into the fixing device bolt member.

With this configuration, the cable rack can be fixed to the installation section using a single fastener, improving workability.

A third characteristic configuration of the cable rack of the present invention is that it comprises a connector for connecting adjacent parent girders, the connector comprising a connector main body that embraces an end of one parent girder and an end of the other parent girder, at least two connector bolt members that penetrate the end of one parent girder and the connector main body or that penetrate the end of the other parent girder and the connector main body, and at least two connector nut members that screw into the connector bolt members.

With this configuration, adjacent parent girders can be connected using a single connector, improving workability.

A fourth characteristic configuration of the cable rack of the present invention is that it is equipped with a connector for connecting adjacent parent girders, and the connector comprises two connector plate members that clamp the lower flange portion, a connector bolt member that penetrates the two connector plate members, and a connector nut member that screws into the connector bolt member.

With this configuration, adjacent parent girders can be connected using a single connector, improving workability.

A fifth characteristic configuration of the cable rack of the present invention is that it comprises a lighting device mounting fixture for mounting a lighting device, the lighting device mounting fixture comprising a locking plate portion that can be inserted into the internal space of the parent girder from between the pair of lower flange portions and can be engaged by the pair of lower flange portions by changing the lighting device mounting fixture to a posture different from that at the time of the insertion, a mounting plate portion having a mounting portion for mounting the lighting device, and a bent portion that connects the locking plate portion and the mounting plate portion at an angle.

With this configuration, when attaching the lighting device fixture to the parent beam, the locking plate portion can be engaged with the pair of lower flange portions by simply changing the position of the lighting device fixture, improving workability.

A sixth characteristic configuration of the cable rack of the present invention is that it comprises a lighting device mounting fixture for mounting a lighting device, the lighting device mounting fixture comprising a locking plate portion that can be inserted into the internal space of the parent girder from between the pair of lower flange portions and can be engaged by the pair of lower flange portions by rotating it by a predetermined angle after the insertion, a mounting plate portion having a mounting portion for mounting the lighting device, a connecting bolt member that passes through the locking plate portion and the mounting plate portion to connect the locking plate portion and the mounting plate portion, and a connecting nut member that screws into the connecting bolt member.

With this configuration, when attaching the lighting device fixture to the parent beam, the locking plate can be attached to the pair of lower flanges by simply rotating the locking plate by a specified angle, improving workability.

FIG. 1 is a perspective view showing a cable rack of the present invention. 11A to 11C are schematic diagrams showing a procedure for fixing the cable rack and the installation section with a fixing device. 11A to 11C are schematic diagrams showing a procedure for fixing the cable rack and the installation section with a fixing device. 11A to 11C are schematic diagrams showing a procedure for fixing the cable rack and the installation section with a fixing device. 13 is a schematic diagram showing a procedure for connecting adjacent parent girders together using a connector. FIG. 13 is a schematic diagram showing a procedure for connecting adjacent parent girders together using a connector. FIG. A cross-sectional view of adjacent parent beams connected together by a connector. 1 is a schematic diagram showing a case where a lighting device is attached to a cable rack using a lighting device mounting fixture. 13 is a schematic diagram showing the procedure for attaching the lighting device mounting fixture to the parent beam. FIG. 13 is a schematic diagram showing the procedure for attaching the lighting device mounting fixture to the parent beam. FIG. 1A to 1C are schematic diagrams showing a procedure for mounting a lighting device using a lighting device mounting fixture. 13 is a schematic diagram showing a procedure for attaching a lighting device mounting fixture of another embodiment to a parent beam. FIG. 13 is a schematic diagram showing a procedure for attaching a lighting device mounting fixture of another embodiment to a parent beam. FIG. 13 is a schematic diagram showing a procedure for attaching a lighting device mounting fixture of another embodiment to a parent beam. FIG. FIG. 11 is a perspective view showing a cable rack according to another embodiment. 13 is a schematic diagram showing a procedure for connecting adjacent parent girders together using a connector according to another embodiment. FIG. 13 is a schematic diagram showing a procedure for connecting adjacent parent girders together using a connector according to another embodiment. FIG. 13 is a schematic diagram of adjacent parent beams connected together by a connector according to another embodiment. FIG. 13 is a schematic diagram showing a case where a lighting device is attached by a lighting device attachment fixture of another embodiment. FIG.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
The cable rack of the present invention is laid inside a tunnel to hold various cables.
As shown in Figure 1, the cable rack X of the present invention comprises a single long parent girder 10 and child girders 11 arranged at multiple locations spaced apart in the longitudinal direction of the parent girder 10 and capable of holding cables.

The parent girder 10 and the child girder 11 may be made of metal, but this is not limited thereto, and resin or the like may be used. The parent girder 10 is, for example, in the form of a rectangular column, and short child girder 11 are arranged at approximately equal intervals on the upper surface of the parent girder 10, but this is not limited thereto. The child girder 11 is not particularly limited in shape as long as it can hold the cable. In this embodiment, a case is described in which the child girder 11 is provided with cable stoppers 11a at both ends to prevent the cable from falling, and has a U-shaped cross section. In this embodiment, a case is described in which the child girder 11 is fixed to the parent girder 10 with a bolt 61, but this is not limited thereto. The bolt may be, for example, a hexagonal bolt or a flat head bolt.

According to this configuration, the cable rack X can be made of a simple structure because it is made up of only one parent girder 10. In addition, because it is made up of only one parent girder 10, when connecting parent girders 10 to each other, it is only necessary to connect one parent girder 10, which improves workability.

In a cross-sectional view perpendicular to the longitudinal direction of the parent girder 10, the parent girder 10 is configured to include an upper surface mounting portion 10A on which the child girder 11 is placed, a pair of side portions 10B that hang down from both ends of the upper surface mounting portion 10A, and a pair of lower flange portions 10C that are bent inward from the lower ends of the side portions 10B and are arranged facing each other with a gap between them.

Multiple parent girders 10 are provided on the installation section 1 on which the cable rack X is installed so as to extend along the vehicle travel direction inside the tunnel. The installation section 1 is designed so that the cable rack X can be installed in a substantially horizontal state across multiple support members 2 provided at substantially equal intervals along the vehicle travel direction on the side wall of the tunnel. The cable rack X of the present invention includes a fixing device 20 that fixes the installation section 1 and the cable rack X (Figs. 2 to 4).

The fixture 20 includes a fixture plate member 21 that can slide between the pair of lower flange portions 10C, a fixture bolt member 22 that passes through the fixture plate member 21, and a fixture nut member 23 that screws into the fixture bolt member 22.

The fixing bolt member 22 passes through the bolt hole 21a formed in the fixing plate member 21. The fixing plate member 21 may be made of metal, but is not limited to this material, and may be made of resin or the like. In this embodiment, the fixing plate member 21 is provided with an installation part misalignment prevention part 21b that prevents the installation part 1 from misaligning, and a parent girder misalignment prevention part 21c that prevents the parent girder 10 from misaligning. The installation part misalignment prevention part 21b is preferably a pair of flange parts bent downward relative to the fixing plate member 21, and the parent girder misalignment prevention part 21c is preferably a pair of flange parts bent upward relative to the fixing plate member 21, but is not limited to this form.

The procedure for fixing the cable rack X and the installation section 1 with the fixing device 20 is as follows. First, the fixing device 20 is inserted into the internal space of the parent girder 10 by sliding it between the pair of lower flanges 10C from the end of the parent girder 10 (Figures 2-3). At this time, a part of the lower surface of the fixing device plate member 21 slides on the upper surface of the lower flanges 10C. The fixing device bolt member 22 is engaged with the L-shaped groove 1a formed in the installation section 1, and the installation section 1 is clamped by the pair of flanges that are the installation section misalignment prevention section 21b (Figure 4 (a)). At this time, the pair of flanges that are the parent girder misalignment prevention section 21c are in close proximity to or in contact with the inside of the side section 10B of the parent girder 10 (Figure 4 (b)). When the fastener nut member 23 is screwed into the fastener bolt member 22 in this state, a part of the bottom surface of the fastener plate member 21 comes into close contact with the top surface of the lower flange portion 10C, and the bottom surface of the lower flange portion 10C comes into close contact with the top surface of the installation portion 1, and the fastener nut member 23 tightens the bottom surface of the installation portion 1 (FIG. 4(b)). By tightening the bolts in this way, the installation portion 1 and the cable rack X can be fixed with one fastener 20.

The tip of the fixing bolt member 22 may be crushed while the fixing nut member 23 is screwed into it. Crushing the tip of the fixing bolt member 22 allows deformation such as increasing the diameter of the tip, and even if the fixing nut member 23 becomes loose due to vibrations in the tunnel, this deformed portion acts as a retainer for the fixing nut member 23, preventing the fixing nut member 23 from falling off the fixing bolt member 22.

The cable rack X of the present invention includes a connector 30 that connects adjacent parent girders 10 (FIGS. 5 to 7). The connector 30 includes a connector body 30A that holds the end of one parent girder 10 and the end of the other parent girder 10', at least two connector bolt members 33 that penetrate the end of one parent girder 10 and the connector body 30A, or the end of the other parent girder 10' and the connector body 30A, and at least two connector nut members 34 that screw into the connector bolt members 33.

The connector bolt members 33 may be provided with at least one connector bolt member 33 penetrating the end of one parent girder 10 and the connector body 30A, and at least one connector bolt member 33 penetrating the end of the other parent girder 10' and the connector body 30A. Therefore, the number of connector bolt members 33 may be two or more. The number of connector nut members 34 may be the same as the number of connector bolt members 33.

The connector body 30A is configured to include a connector body upper surface portion 30a that faces the upper surface mounting portion 10A of the parent girder 10, a pair of connector body side portions 30b that face the side portions 10B of the parent girder 10, and a pair of connector body lower flange portions 30c that face the lower flange portions 10C of the parent girder 10. In this way, the connector body 30A is configured to hold the parent girder 10 as if wrapping it, and to connect adjacent parent girders to each other.

The connector body 30A may be made of metal, but is not limited to this, and may be made of resin or the like. The connector bolt member 33 passes through bolt holes 10α, 30α formed in the parent beam 10 and the connector body 30A, respectively. In this embodiment, a mode in which two connector bolt members 33 are used is described, but is not limited to this mode.

The procedure for connecting adjacent parent girders 10 using the connector 30 is as follows. First, insert the end of one parent girder 10 into one end of the connector body 30A, and insert the end of the other parent girder 10' into the other end of the connector body 30A (Figures 5-6). The end of one parent girder 10 and the end of the other parent girder 10' are abutted, and with the connector body 30A holding the end of one parent girder 10 and the end of the other parent girder 10', the connector bolt members 33 are inserted into the bolt holes 10α, 30α (Figure 7). When the connector nut member 34 is screwed into the connector bolt member 33, the underside of the connector body 30A comes into close contact with the upper surface of one parent girder 10, and the underside of the connector body 30A comes into close contact with the upper surface of the other parent girder 10', and the connector nut member 34 tightens up the underside of one parent girder 10 and the underside of the other parent girder 10'. By tightening the bolt in this way, adjacent parent girders 10 can be connected together using one connector 30.

The tip of the connector bolt member 33 may be crushed while the connector nut member 34 is screwed into it. Crushing the tip of the connector bolt member 33 allows deformation such as increasing the diameter of the tip, and even if the connector nut member 34 becomes loose due to vibrations in the tunnel, this deformed portion acts as a retainer for the connector nut member 34, preventing the connector nut member 34 from falling off the connector bolt member 33.

The cable rack X of the present invention includes a lighting device mounting fixture 40 for mounting a lighting device 50 (FIGS. 8 to 11). The lighting device mounting fixture 40 includes a locking plate portion 41 that can be inserted into the internal space of the parent girder 10 between a pair of lower flange portions 10C and can be locked by the pair of lower flange portions 10C by changing the lighting device mounting fixture 40 to a different posture from that at the time of insertion, a mounting plate portion 42 having a mounting portion 42a for mounting the lighting device 50, and a bent portion 43 that connects the locking plate portion 41 and the mounting plate portion 42 at an angle.

In this embodiment, a mode in which a pair of lighting device mounting fixtures 40 are attached to both ends of a lighting device 50 will be described. A lighting device connection member 50A is attached to both ends of the lighting device 50. The lighting device connection member 50A has a connection plate-shaped portion 50a that is in surface contact with the lighting device mounting fixture 40. The connection plate-shaped portion 50a can be provided so as to face the end of the lighting device 50, but is not limited to such a mode. The locking plate portion 41 can be inserted into the internal space of the parent beam 10 from between the pair of lower flange portions 10C, and the shape of the locking plate portion 41 is not particularly limited as long as it can be inserted into the internal space of the parent beam 10 from between the pair of lower flange portions 10C and can be locked by the pair of lower flange portions 10C by changing the posture from that at the time of insertion. In this embodiment, the locking plate portion 41 is in the form of a rectangular plate, and the dimensions of the locking plate portion 41 are set so that the long dimension of the locking plate portion 41 is longer than the dimension between the pair of lower flange portions 10C and the short dimension of the locking plate portion 41 is shorter than the dimension between the pair of lower flange portions 10C. By configuring the locking plate portion 41 in this manner, when the lighting device mounting fixture 40 is changed to a different position from that at the time of the above-mentioned insertion, both ends of the long side of the locking plate portion 41 can be locked to the pair of lower flange portions 10C, so that the locking plate portion 41 can be locked by the pair of lower flange portions 10C.

The shape of the mounting plate 42 is not particularly limited as long as it has a mounting portion 42a for mounting the lighting device 50. In this embodiment, the mounting plate 42 is described as having a plate-like shape with two mounting holes as the mounting portion 42a.

The locking plate portion 41 and the mounting plate portion 42 are connected via the bent portion 43, but a notch portion 44 may be formed between the locking plate portion 41 and the mounting plate portion 42 to connect to the bent portion 43. The locking plate portion 41, the mounting plate portion 42, and the bent portion 43 may all be made of metal, but this is not limited thereto, and resin or the like may also be used. For the bent portion 43 that connects the locking plate portion 41 and the mounting plate portion 42 at an angle, the angle α is preferably 90° or less, for example, about 80 to 85° (FIG. 11(b)). If the angle α is set in this way, when the lighting device 50 is attached to the mounting plate portion 42, if the angle of the locking plate portion 41 and the mounting plate portion 42 is adjusted to be wider (for example, to be 90°), the force with which the locking plate portion 41 presses against the lower flange portion 10C will increase by the amount that the bent portion 43 is deformed (widened). This increases the force with which the lighting device mounting fixture 40 engages the lower flange portion 10C, allowing the lighting device mounting fixture 40 to be securely fixed to the lower flange portion 10C.

The procedure for mounting the lighting device 50 using the lighting device mounting fixture 40 is as follows. First, a pair of lighting device mounting fixtures 40 are attached to the parent girder 10. With the locking plate portion 41 of the lighting device mounting fixture 40 in a vertical position (with the mounting plate portion 42 in a horizontal position), the locking plate portion 41 is inserted into the internal space of the parent girder 10 between the pair of lower flange portions 10C (Figure 9). With the locking plate portion 41 inserted, it is rotated about 90° horizontally, and the mounting plate portion 42 is then changed in position to be vertical, so that both ends of the long side of the locking plate portion 41 are engaged with the pair of lower flange portions 10C (Figure 10). With the pair of lighting device mounting fixtures 40 attached to the parent girder 10 in this way, the lighting device 50 is attached to the lighting device mounting fixture 40 with the bolts 51 (Figures 8 and 11).

[Another embodiment 1]
Instead of the lighting device fixture 40 described above, the lighting device fixture may be configured as follows.
That is, as shown in Figures 12 to 14, the lighting device mounting fixture 40' in this form comprises a locking plate portion 41' that can be inserted into the internal space of the parent girder 10 from between a pair of lower flange portions 10C and can be engaged by the pair of lower flange portions 10C by rotating it by a predetermined angle after said insertion, a mounting plate portion 42' having a mounting portion 42a for mounting the lighting device 50, a connecting bolt member 45 that passes through the locking plate portion 41' and the mounting plate portion 42' to connect the locking plate portion 41' and the mounting plate portion 42', and a connecting nut member 46 that screws into the connecting bolt member 45.

The shape of the locking plate portion 41' is not particularly limited as long as it can be inserted into the internal space of the parent girder 10 between the pair of lower flange portions 10C and can be locked by the pair of lower flange portions 10C by rotating the locking plate portion 41' by a predetermined angle after the insertion. The locking plate portion 41' is configured to be independently rotatable around the connecting bolt member 45 as an axis. If the locking plate portion 41' is configured in this manner, both ends of the locking plate portion 41' can be locked to the pair of lower flange portions 10C by rotating the locking plate portion 41' by a predetermined angle (e.g., 90°) after the insertion, so that the locking plate portion 41' can be locked by the pair of lower flange portions 10C. After the locking plate portion 41' is locked to the pair of lower flange portions 10C, the lower surface of the locking plate portion 41' and the upper surface of the lower flange portion 10C are in close contact with each other when the connecting nut member 46 is screwed into the connecting bolt member 45. By tightening the bolts in this manner, the lighting device mounting fixture 40' can be attached to the parent girder 10.

[Another embodiment 2]
In the above-described embodiment, the child girders 11 are fixed to the parent girders 10 by the bolts 61. However, the present invention is not limited to this embodiment, and each child girder may be fixed by, for example, two rivets 62 as shown in Fig. 15. The number of rivets 62 is not limited.

[Another embodiment 3]
In the above-described embodiment, the connector 30 for connecting adjacent parent girders 10 includes the connector main body 30A, the connector bolt member 33, and the connector nut member 34. However, the present invention is not limited to such an embodiment, and as shown in Figs. 16 to 18, the connector 30 may include two connector plate members 31, 32 that sandwich the lower flange portion 10C, a connector bolt member 33 that penetrates the two connector plate members 31, 32, and a connector nut member 34 that screws into the connector bolt member 33.

The two connector plate members 31, 32 are configured by stacking the upper connector plate member 31 and the lower connector plate member 32. The two connector plate members 31, 32 may be made of metal, but are not limited to this material, and may be made of resin or the like. The connector bolt member 33 penetrates the bolt holes 31a, 32a formed in each of the connector plate members 31, 32. In this embodiment, a configuration in which two connector bolt members 33 are used is described, but is not limited to this configuration. In addition, in this embodiment, a case in which each of the two connector plate members 31, 32 is provided with connector parent beam position shift prevention parts 31b, 32b that prevent the position shift of the parent beam 10 is described. The connector parent beam position shift prevention parts 31b, 32b are preferably a pair of flange parts bent upward, but are not limited to this configuration.

The procedure for connecting adjacent parent girders 10 with the connector 30 is as follows. First, the two connector plate members 31, 32 are placed one on top of the other with a small gap between them (enough to hold the lower flange portion 10C), and one end of the connector 30 is inserted into the end of one parent girder 10 (Figure 16). At this time, the connector 30 is inserted into the end of the parent girder 10 so that the two connector plate members 31, 32 hold the lower flange portion 10C (Figure 17 (a)). The pair of flange portions that are the connector parent girder position shift prevention portion 31b are in close proximity to or in contact with the inside of the side portion 10B of the parent girder 10, and the pair of flange portions that are the connector parent girder position shift prevention portion 32b are in close proximity to or in contact with the outside of the side portion 10B of the parent girder 10 (Figure 17 (b)). In this state, the other end of the connector 30 is inserted into the end of the other parent girder 10' (Figures 17-18). When the end of one parent girder 10 and the end of the other parent girder 10' are abutted, the connector nut member 34 is screwed into the connector bolt member 33, so that the lower surface of the upper connector plate member 31 and the upper surface of the lower flange portion 10C are in close contact with each other, and the lower surface of the lower flange portion 10C and the upper surface of the lower connector plate member 32 are in close contact with each other, and the connector nut member 34 tightens the lower surface of the lower connector plate member 32. By tightening the bolts in this way, adjacent parent girders 10 can be connected together using one connector 30.

The tip of the connector bolt member 33 may be crushed while the connector nut member 34 is screwed into it. Crushing the tip of the connector bolt member 33 allows deformation such as increasing the diameter of the tip, and even if the connector nut member 34 becomes loose due to vibrations in the tunnel, this deformed portion acts as a retainer for the connector nut member 34, preventing the connector nut member 34 from falling off the connector bolt member 33.

[Another embodiment 4]
In the above-described embodiment, the lighting device connecting members 50A are attached to both ends of the lighting device 50, and the lighting device connecting members 50A are provided with the connecting plate parts 50a so as to face the ends of the lighting device 50. However, the present invention is not limited to this embodiment, and as shown in Fig. 19, the connecting plate parts 50a may be provided so as not to face the ends of the lighting device 50. By configuring in this manner, the distance at which the lighting device 50 is separated from the parent beam 10 can be made larger than in the above-described embodiment.

This invention can be used for equipment-mounted cable racks that are installed inside tunnels and hold various cables.

X Cable rack 1 Installation section 10 Parent girder 10A Upper surface mounting section 10B Side section 10C Lower flange section 11 Child girder 20 Fixing device 21 Fixing device plate member 22 Fixing device bolt member 23 Fixing device nut member 30 Connector 30A Connector body 33 Connector bolt member 34 Connector nut member 40, 40' Lighting device mounting device 41, 41' Locking plate section 42, 42' Mounting plate section 42a Mounting section 43 Bent section 45 Connection bolt member 46 Connection nut member 50 Lighting device

Claims (6)

The system is provided with a single long parent girder laid in a tunnel, and child girders arranged at intervals in a longitudinal direction of the parent girder and capable of holding cables ,
The cable rack is configured so that, in a cross-sectional view perpendicular to the longitudinal direction of the parent girder, the parent girder comprises an upper surface mounting portion on which the child girder is placed, a pair of side portions hanging down from both ends of the upper surface mounting portion, and a pair of lower flange portions bent inward from the lower ends of the side portions and arranged opposite each other with a gap between them . a mounting unit for mounting the cable rack and a fixing device for fixing the cable rack;
The cable rack of claim 1, wherein the fixing device comprises a fixing plate member that can slide between a pair of the lower flange portions, a fixing bolt member that passes through the fixing plate member, and a fixing nut member that screws into the fixing bolt member. A connector is provided for connecting adjacent parent girders,
The cable rack of claim 1, wherein the connector comprises a connector body that holds an end of one parent girder and an end of the other parent girder, at least two connector bolt members that penetrate the end of one parent girder and the connector body or the end of the other parent girder and the connector body, and at least two connector nut members that screw into the connector bolt members . A connector is provided for connecting adjacent parent girders,
The cable rack of claim 1, wherein the connector comprises two connector plate members that sandwich the lower flange portion, a connector bolt member that passes through the two connector plate members, and a connector nut member that screws into the connector bolt member. A lighting device mounting fixture for mounting a lighting device is provided, the lighting device mounting fixture comprising:
a locking plate portion that can be inserted into the internal space of the parent girder from between the pair of lower flange portions and can be locked by the pair of lower flange portions by changing the posture of the lighting device mounting fixture to a different posture from that at the time of the insertion;
a mounting plate portion having a mounting portion for mounting the lighting device;
The cable rack according to claim 1 , further comprising a bent portion that connects the locking plate portion and the mounting plate portion at an angle. A lighting device mounting fixture for mounting a lighting device is provided, the lighting device mounting fixture comprising:
a locking plate portion that can be inserted into an internal space of the parent girder from between the pair of lower flange portions and can be locked by the pair of lower flange portions by rotating the locking plate portion by a predetermined angle after the insertion;
a mounting plate portion having a mounting portion for mounting the lighting device;
a connecting bolt member that penetrates the locking plate portion and the mounting plate portion to connect the locking plate portion and the mounting plate portion;
The cable rack according to claim 1 , further comprising: a connection nut member that is screwed onto the connection bolt member.

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