JP7645516B2 - Low-voltage cable installation tool and installation method - Google Patents

Description

The present invention relates to a low-voltage cable installation tool and installation method that uses a wire as a guide when installing a low-voltage cable on a vertical cable rack.

Conventionally, when installing low-voltage cables on vertical cable racks, the cable has typically been suspended from above. However, because low-voltage cables are light and flexible, the ends of the cables tend to bend easily.

As a result, when low-voltage cables were hung and laid, the curved ends of the cables would often pass between the sub-girders of the cable rack or would be unable to pass through the through frame, making the work inefficient.

Meanwhile, Patent Document 1 describes a mobile cable laying system that lays low-voltage cables from the bottom to the top of a vertical cable rack. In this system, the cable 2 is connected to a driving rope 12 used as a guide and laid. In other words, multiple connectors 14 are attached in advance to the driving rope 12 that is pulled out downward. Meanwhile, the tip side of the cable 2 is covered with a first cable grip 3, and the middle part of the cable 2 is also covered with a second cable grip 4.

Then, the first cable grip 3 and the second cable grip 4 on the cable 2 side are connected to the connector 14 of the drive rope 12 that has been pulled out downward, thereby connecting the cable 2 to the drive rope 12. When the drive rope 12 is lifted in this state, the cable 2 moves from the bottom to the top of the vertical cable rack along the drive rope 12.

JP 2013-220001 A

In the cable laying and moving system described in Patent Document 1, the cable 2 is laid while being pulled up, so a winch and a drive rope for winding up the winch must be prepared for laying a lightweight low-voltage cable. As a result, a large-scale device is required for laying a low-voltage cable.

In order to connect the cable 2 to the drive rope 12 used as a guide, it is necessary to attach multiple connectors 14 to the drive rope 12 in advance. Furthermore, it is also necessary to cover the cable 2 in advance with the first cable grip 3 at the tip side and the second cable grip 4 at the middle part of the cable 2.

Therefore, in this system, the installation of the multiple connecting bodies 14 and the covering work of the first cable grip 3 and the second cable grip 4 require a lot of work.

On the other hand, in the general work of laying a low-voltage cable while hanging it, for example, the work is done by hanging it from the upper floors of a building down. However, the curved end of the low-voltage cable sometimes passes between the sub-girders of the cable rack, or cannot pass through the penetration frame, so it is necessary to station a worker in an intermediate position to monitor it.

Moreover, the locations where vertical cable racks are installed in buildings can be dark and poorly visible. In these cases, it can be difficult to visually confirm that the cables are installed correctly.

The present invention was created to solve the problems of the past, and aims to provide a low-voltage cable installation jig and installation method that can improve the work efficiency of installing low-voltage cables on vertical cable racks.

The first means of the present invention to achieve the above-mentioned object is a laying jig 1 in which a guide wire W is stretched above and below a vertical cable rack P, and which can move by falling under its own weight together with a cable C to be laid on the vertical cable rack P along the guide wire W, and which is equipped with a wire insertion device 2 through which the guide wire W is inserted, and a cable connecting device 3 which connects the cable C.

The wire insertion tool 2 of the second means is annular with an opening and closing gate 2A for introducing the wire, and is positioned to hold the guide wire W above and below along the longitudinal direction of the installation jig 1.

The third means, the cable connector 3, is equipped with twisters 7 and 8 that are arranged at the upper end of the cable installation jig 1.

The fourth means is a buzzer 4 that is provided on the installation jig 1 to notify the position to which the installation jig 1 has been moved.

The fifth means is to provide the installation jig 1 with a light 5 that indicates the movement position of the installation jig 1.

The sixth means, the light 5, is slidably arranged at the lower end of the installation jig 1 and is equipped with a cushioning material 6 that absorbs shock when dropped.

The seventh means is a cable laying method in which a guide wire W is stretched above and below a vertical cable rack P, and a cable C is laid on the vertical cable rack P along the guide wire W, in which an end of the cable C is connected to a laying jig 1 that can move by falling under its own weight along the guide wire W, and this cable C is laid on the vertical cable rack P together with the laying jig 1 by falling under its own weight.

The eighth means is to notify the moving position of the cable C by using a buzzer 4 provided on the cable installation jig 1 in the cable installation method.

The ninth means is a cable laying method in which a light 5 provided on the cable laying jig 1 indicates the moving position of the cable C.

The tenth method is a cable installation method in which a single guide wire W is used to install a cable C on a vertical cable rack P.

The cable installation jig 1 of the eleventh means is equipped with a cable connector 3 for connecting the cable C, and the cable connector 3 is equipped with twist return 7, 8 arranged at the upper end of the cable installation jig 1.

The twelfth means is a cable installation method in which two or more guide wires W are used to install a cable C on a vertical cable rack P.

According to the present invention, the low-voltage cable is laid along the wire, so it does not pass between the sub-girders of the cable rack or cannot pass through the through-hole frame. As a result, the work efficiency of laying the low-voltage cable on the vertical cable rack can be improved.

What's more, safe construction is possible while constantly checking the installation status, and the number of workers required to monitor on intermediate floors can be reduced, leading to reduced labor costs.

FIG. 1 is a perspective view showing an embodiment of the present invention. FIG. 1 is a side view showing an embodiment of the present invention. FIG. 2 is a rear view showing an embodiment of the present invention. FIG. 2 is a bottom view showing one embodiment of the present invention. 1 is a vertical cross-sectional view showing a buzzer of the present invention. FIG. 2 is a vertical cross-sectional view showing the light of the present invention. FIG. 2 is an enlarged view of a main portion showing a state in which the present invention is used. FIG. 2 is a front view showing a state in which the present invention is used.

The present invention relates to an installation jig 1 used when installing a low-voltage cable on a vertical cable rack P. That is, the cable is installed on the vertical cable rack P while moving along a guide wire W stretched above and below the vertical cable rack P together with the cable C by falling under its own weight (see FIG. 8).

The installation jig 1 comprises a wire insertion tool 2 and a cable connector 3 (see Figure 1). The installation jig 1 shown in the figure is a long strip-shaped plate with a cable connector 3 at the top end and a wire insertion tool 2 on the plate surface side.

The wire insertion device 2 is a ring-shaped member through which the guide wire W is inserted. For this reason, the wire insertion device 2 is formed in the shape of a carabiner and equipped with an opening and closing gate 2A for introducing the wire (see Figure 4).

This wire insertion device 2 is configured to hold the guide wire W inserted into the wire insertion device 2 along the longitudinal direction of the installation jig 1, improving the stability of the installation jig 1 when it is moved (see Figure 7). The illustrated wire insertion devices 2 are formed as a pair above and below on the same plate surface side (see Figure 2), but the number, shape, position, etc. of the wire insertion devices 2 can be changed as desired.

The cable connector 3 is shaped like an eyebolt and is a connecting member that connects the cable C to the cable installation jig 1. The cable C connected to the cable connector 3 moves as the cable connector 3 falls under its own weight (see FIG. 8). At this time, the cable connector 3 is provided with return twists 7 and 8 so that the cable connector 3 does not rotate and apply a load to the cable C (see FIG. 7). In the illustrated example, the cable connector 3 is connected to the cable C via two return twists 7 and 8. A single return twist may also be used.

The cable C is connected to the upper twist 8 via a cable grip 10 (see Figure 7). To prevent the cable grip 10 from coming loose and causing the installation jig 1 to fall, the twist 8 is connected to the side of the cable C with a string-like anti-drop device 11 and further secured with a cable tie 9.

The installation jig 1 is also provided with a buzzer 4 that notifies the user of the position to which the installation jig 1 has been moved (see Figure 5). The illustrated buzzer 4 is located in the longitudinal center of the installation jig 1 and is activated by a switch 4A provided on the opposite side of the wire insertion tool 2 (see Figure 3), and is provided with a battery case 4B on top of the buzzer 4 (see Figure 5).

In addition, the installation jig 1 is provided with a light 5 that indicates the moving position of the installation jig 1 (see Figure 6). The illustrated light 5 is slidably arranged at the lower end of the installation jig 1, and is provided with a cushioning material 6 that protects the side of the tip of the light 5. Therefore, if an impact is applied to the lower end of the light 5, the light 5 is stored inside the installation jig 1 to absorb the impact, so that the worker can be protected even if it comes into contact with him.

The guide wire W is stretched above and below the vertical cable rack P in advance (see Figure 8). For example, the guide wire W is fixed to steel material P2 provided on the top and bottom tiers of the vertical cable rack P. This fixing position and fixing member can be changed as desired. For example, the steel material P2 is hung across an opening formed in the floor or ceiling, and the guide wire W is fixed to this steel material P2. Alternatively, it is possible to stack steel material P2 on top of steel material P2 fixed to the floor, and then fix the guide wire W to the stacked steel material P2.

The cable laying method of the present invention is a laying method that uses the above-mentioned laying jig 1. That is, this is a laying method in which an end of a cable C is connected to the laying jig 1 that can move by falling under its own weight along a guide wire W, and this cable C is then dropped together with the laying jig 1 under its own weight to be laid on a vertical cable rack P.

In this installation method, a buzzer 4 provided on the installation jig 1 is used to notify the start and end of installation of the cable C, or the approaching state of the installation jig 1. In addition, a light 5 provided on the installation jig 1 is used to confirm the moving position of the cable C.

The embodiments of the present invention are not limited to the illustrated examples. Design changes are free to be made within the scope that does not change the gist of the present invention.

In the above embodiment, one guide wire W is used, but two guide wires W can be used. In that case, a wire insertion tool 2 may be provided for each guide wire W so that two guide wires W can be passed through the installation jig 1. The installation jig 1 can improve workability by shortening the time required for installation preparation compared to the installation jig 1 using two guide wires W. In other words, one guide wire W is better because fewer guide wires W require fewer man-hours. In addition, since low-current cables are light, one guide wire W is sufficient, and installation is easy even in narrow through holes. In addition, the turnbuckle 3A may be omitted or replaced with a heavier one to adjust the weight of the installation jig 1. Furthermore, the installation jig 1 may be pulled from below by a wire instead of by its own weight.

C Cable P Vertical cable rack P1 Parent girder P2 Steel material W Guide wire 1 Laying jig 2 Wire insertion tool 2A Opening and closing gate 3 Cable connector 3A Turnbuckle 4 Buzzer 4A Switch 4B Battery case 5 Light 6 Cushioning material 7 Rewind 8 Rewind 9 Cable tie 10 Cable grip 11 Fall prevention tool

Claims (12)

A cable installation jig in which guide wires are stretched above and below a vertical cable rack and which can move by falling under its own weight together with a cable to be laid on the vertical cable rack along the guide wires, the cable installation jig comprising a wire insertion device for inserting the guide wires and a cable connecting device for connecting the cables. The cable installation jig according to claim 1, wherein the wire insertion tool is annular with an opening/closing gate for introducing the guide wire, and is arranged to hold the guide wire above and below along the longitudinal direction of the installation jig. 3. The cable installation jig according to claim 1, wherein the cable connector includes a reel disposed at an upper end of the cable installation jig. 3. The cable installation jig according to claim 1, further comprising a buzzer for notifying a position to which the cable installation jig has been moved. 3. The cable installation jig according to claim 1, further comprising a light for indicating a position to which the cable installation jig has been moved. The cable installation jig of claim 5, wherein the light is slidably disposed at the lower end of the installation jig and is provided with a cushioning material to protect the light in the event of a fall. A cable laying method in which guide wires are stretched above and below a vertical cable rack and a cable is laid on the vertical cable rack along the guide wires, the method being characterized in that an end of the cable is connected to a laying jig that can move along the guide wire by falling under its own weight , and the cable is laid on the vertical cable rack together with the laying jig by falling under its own weight. The cable installation method according to claim 7, wherein a buzzer provided on the installation jig notifies the user of the position to which the cable has been moved. The cable installation method according to claim 7, wherein a light provided on the installation jig indicates the moving position of the cable. 10. The method according to claim 7, wherein a single guide wire is used to install the cable on the vertical cable rack. The cable installation method according to claim 10, wherein the installation jig includes a cable connector for connecting the cables, and the cable connector includes a twister disposed at the upper end of the installation jig. 8. The method of claim 7, wherein the cable is laid on the vertical cable rack using two or more guide wires.