JPH0412977A - Cable drum and laying method of cable - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a cable drum and a cable laying/erecting method, and is particularly suitable for laying/erecting a continuous cable in multiple sections when laying a long cable underground or above the ground. The present invention relates to a suitable cable drum and cable laying/erecting method.

[Conventional technology]

Generally, when laying and constructing cables, long cables are used from the viewpoint of reducing the number of cable connection points. However, pulling a long cable over a long distance places a large amount of tension on the cable.
Normally, the laying/erecting section is divided into multiple sections, and the work is carried out by taking in the material once at an intermediate point and sending it out again to the next section. By the way, if the cable taken in in the middle is temporarily wound around a cylindrical drum and then fed out again, the cable will become twisted. A method has been adopted in which the cables to be used are once accumulated in a figure-eight shape and then fed out.

[Problem to be solved by the invention]

However, in the conventional method described above, the cables are stacked on the ground in a figure 8 shape, and when being pulled out, the stacked cables are turned upside down and the cable ends are facing up before being pulled out. This was causing problems. In other words, in the above conventional method, there is a risk that the cables intersect in the figure 8 shape may be deformed due to their own weight, and a large space is required to stack the cables in a figure 8 shape, which can cause traffic congestion if the work is carried out on the road. It had also become. Furthermore, turning the cables stacked in a figure-eight pattern upside down not only requires a large number of workers, but also poses a risk of damaging the cables. Furthermore, since there is a limit to the length of cables that can be turned upside down, there is also a limit to the length of cables that can be laid and erected. The present invention has focused on the above-mentioned conventional problems, and has developed a cable that can be wound up and stored without twisting during unrolling, and that can be laid and erected in a narrow space without damaging the cable. The purpose is to provide drum and cable laying/erecting methods.

[Means to solve the problem]

In order to achieve the above object, the cable drum according to the present invention forms a double cylinder with an inner cylinder and an outer cylinder supported by a pair of side end support members, and a cylinder end is connected to the side wall of the outer cylinder. An opening is formed, and the side end support member is detachably attached to the double cylinder. In addition, the cable laying/erecting method of the present invention, when laying/erecting a long cable in multiple sections, takes in the cable once in the middle of the laying/erecting section and supplies it again to the next section. - In the construction method, the taken cable is inserted into the cable drum consisting of a double cylinder installed horizontally with an opening formed in the outer cylinder, and the cable end is introduced through the opening and the cable drum is inserted into the inner cylinder in the cylinder space. After winding the cable around the drum, it is reversed at the opening and wound around the outer cylinder, which is then repeatedly stored, and the beginning of the cable winding is pulled out from the opposite end of the drum and supplied to the next section, making it possible to lay a continuous cable.
It is designed to be used for erection.

[Effect]

According to the above configuration, in a cable drum including a double tube in which an opening is formed in the outer tube, with the side end support member at one end of the double tube being removed, the tip of the pulled-out cable is passed through the opening into the tube. The cable can be housed by repeatedly inserting it into the internal space and wrapping it around the inner tube, then turning it over at the opening and wrapping it around the outer tube. When pulling out the housed cable, after attaching the removed side end support member of the double tube, remove the side end support member at the opposite end and pull out the winding start end from the tube end. This makes it possible to accommodate and supply the cable while preventing the cable from being twisted. In addition, by using the above-mentioned cable drum at an intermediate take-in section where cables are laid or erected in multiple sections, it is possible to accommodate cables without stacking them, thereby preventing damage to the cables. Cables can be laid and erected easily in a narrow space without having to give much space.

【Example】

Hereinafter, specific embodiments of the cable drum and cable laying/erecting method according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view of the cable drum 10. As shown in this figure, the cable drum 10 includes a double cylinder 16 formed from a cylindrical inner cylinder 12 and a cylindrical outer cylinder 14. The outer cylinder 14 has an opening 18 extending to the end of the cylinder, and this opening 18 is connected to the cable 20.
It is used as an introduction and withdrawal point. Side end support members 22 are attached to both ends of the double tube 16 so as to be horizontally arranged, and these can be attached to and removed from the double tube 16. The side end support member 22 and the inner cylinder 1 are attached and detached.
2 and the end edge of the outer cylinder 14 by means of a bolt/nut fixing member 24, or other fitting means may be used. Further, the lower part of the side end support member 22 is attached to a base frame 26, and a positioning plate 28 is attached to the base frame 26 so that the side end support member 22 is fixed at a position where it contacts the double cylinder 16. There is. In order to prevent damage to the cable 20, the edge of the opening 18 is provided with a bulge to prevent edges from forming. The cable 20 is wound and accommodated in the cable drum 10 in the following manner. First, the side end support member 22 attached to one end of the double tube 16 is removed to expose the end of the double tube 16. In this state, the cable 20 is wound up. As shown in FIG. 2 (1), the tip of the cable 20 is inserted from the upper edge of the opening 18 and
After wrapping it around the inner cylinder 12, it is pulled out from the lower edge of the opening 18. Next, the rear cable 20 is similarly wound clockwise around the outer circumferential side of the outer tube 14, as shown in FIG. 2(2). Subsequently, as shown in FIG. 3(3), it is inserted into the cylinder space 30 from the lower edge of the opening 18, wrapped around the inner cylinder 12 in a counterclockwise direction, and then pulled out from the upper edge of the opening 18. Thereafter, by repeating steps (2) and (3), the cable 20 is wound and housed in the cable drum 10 while repeating clockwise winding and counterclockwise winding. After accommodation, the side end support member 22 may be attached to the double tube 16 to close the end of the double tube 16. On the other hand, the cable 2 accommodated in this cable drum 1o
0, it is sufficient to remove the side end support member 22 on the opposite side and let out the cable 20 from the winding start end of the cable 20. At this time, the twists applied alternately in the accommodated state are canceled out, and the The cable 20 has no twist. Next, a cable laying method using the cable drum 10 described above will be explained with reference to FIG. If a long cable 20 is laid at once in an underground conduit corresponding to the length of the cable, a large tension will be applied to the cable 20, so it will temporarily bow above the ground in the middle of the conduit, but the cable A drum 10 is used. Figure 3 (
In 1), the intermediate manhole 32 is connected to the pipe line 3 laid in the previous stage.
A cable 20 is pulled out from 4. A cable drum 10 is placed above ground in the intermediate manhole 32 and winds the pulled-out cable 20 into a double tube 16. This winding is performed by removing one side end support member 22, as described above. If the cable length is long, a cable drum 10 may be added so that the entire cable 20 can be wound. When the winding in the intermediate manhole 32 is completed, the cable is fed out to the next stage laying conduit 36, but this is done by removing the side end support member 22 on the side where the winding start end of the cable 20 is located. As shown in FIG. 3(2), the side end support members 22 are removed, and the cables 20 are sequentially pulled out from the cable drum 10 and fed to the next-stage laying conduit 36. In this feeding step, the cable 20 is untwisted and can be laid without twisting before and after the cable drum 10. In such a cable laying method, since the underground cable can be wound and housed in the cable drum 10 through the intermediate manhole 32 when laying the underground cable, a large space above ground is not required. Moreover, since the winding and drawing operations can be carried out by simply attaching and detaching the side end support members 22 while leaving the cable drum 10 in a fixed position, there is no problem of damaging the cable 20. Furthermore, the length that can be wound and accommodated is not limited as long as the cable drums 10 are installed in series, and this is particularly effective for laying modern long cables. In the above embodiment, the inner cylinder 12 and the outer cylinder 14 are formed of cylinders, but they may also be arranged circumferentially using pipe materials and formed as pseudo cylinders. Of course. In addition, although the above-mentioned example explained the case where it was applied to underground cable laying work, it goes without saying that it can be applied not only to this case but also to the case of aerial construction and other works that require intermediate storage. do not have.

【Effect of the invention】

As explained above, according to the present invention, it is possible to provide a cable drum that does not cause twisting of cables before and after winding and unwinding, and this cable drum can be used to conduct cable laying/erecting sections. Since winding and unwinding can be performed in the middle, an excellent effect can be obtained in that the cable can be laid in a narrow space without damaging the cable.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the cable drum according to the embodiment, FIG. 2 is an explanatory diagram of the cable winding state on the cable drum,
FIG. 3 is an explanatory diagram of a cable laying/erecting method using the same cable drum. 10... Cable drum, 12... Inner cylinder, 14... Outer cylinder, 16... Double cylinder,
18...Opening, 20...Cable, 2
2... Side end support member, 30... Cylinder space, 32... Intermediate manhole, 34...
・Previous stage laid pipe line, 36...Next stage laid pipe line. Agent Patent Attorney Tomo Murakami - Figure

Claims (1)

[Scope of Claims] 1) A double cylinder is formed by an inner cylinder and an outer cylinder supported by a pair of side end support members, and an opening extending to the cylinder end is formed in the side wall of the outer cylinder, and the side A cable drum characterized in that an end support member is detachably attached to a double tube. 2) When laying a long cable in multiple sections, in the cable laying/erecting method, the cable is taken out above the ground in the middle of the installation section and then re-supplied to the next section. For a cable drum consisting of a double cylinder installed horizontally with an opening formed in the outer cylinder, the cable end is introduced through the opening, wound around the inner cylinder in the cylinder space, and then turned over at the opening and taken out. A cable laying/erecting method characterized in that a continuous cable is laid by repeatedly winding it around a cylinder, storing it, pulling out the beginning of the cable winding from the opposite end of the drum, and supplying it to the next section.