JPS6399709A - Cable installation in vertical pipe - Google Patents

Abstract

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

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention relates to a method of laying a cable in a vertical pipe, such as a pedestal of a pipe-type steel tower, and particularly a method for easily installing several cable cores in the vertical pipe. This invention relates to a novel method for laying cables in vertical pipes that can be laid in vertical pipes.

[Prior Art] Conventionally, when laying cables to the bases of pipe-type steel towers, mine shafts, shafts of high-rise buildings, etc., the cables were either hoisted up and laid, or the cable structure was A method is adopted in which the wire is attached by hoisting and laying the Metsenger wire. However, in cases where, for example, a normal trunk cable installed underground or above ground is to be erected to the pedestal of a pipe-type steel tower, the current situation relies on the former method, that is, the method of hoisting the cable itself.

Hereinafter, a conventionally proposed method for laying cables in vertical pipes will be explained with reference to FIGS. 4 and 5. In addition,
Although the examples shown in FIGS. 4 and 5 are shown for the case of only one cable, the same installation work is also performed when multiple cables are drawn in. FIG. 4 is an explanatory diagram of a case in which the cable is pulled up and laid straight above the vertical pipe. In this case, a wire lobe 6 connected to the tip of the cable 1 via an untwister 3 is further connected to a metal wheel 4. There is a method in which the winch 5 is connected to a winch 5, the wire rope 6 is wound up by the winch 5, the r-pull 1 is pulled up to a predetermined position, and the vicinity of the upper end of the vertical pipe is fixed with a hanging device or a gripping tool. taken. On the other hand, FIG. 5 is an explanatory diagram of a case in which the cable 1 is pulled out in the direction of lateral force from the intermediate I section 8 of the vertical conduit 2 without being pulled up above the fir pipe 2 as described above. , a sliding plate 7 is placed in the opening 8, and the cable 1 is pulled out of the vertical pipe 2 with a predetermined curvature while being held in place so that the cable 1 is not damaged in the opening 8, and the exposed part outside the pipe is is fixed with a grip μ.

However, in the case of the conventional cable installation method in a vertical pipe, in which the wire lobe 6 connected to the tip of the cable 1 is used to pull up the cable 1, and the portion exposed to the outside of the vertical pipe 2 is held by a gripping tool. In this case, the means to support the Kelpuru 1 inside the vertical pipe 2 is not provided, and the entire weight of the square section of the cable inside the vertical pipe 2 is always applied to the tip of the cable 1, resulting in the following problem. there were.

(1) When laying the cable 1 horizontally by bending it near the upper end of the vertical pipe 2 or at the opening 8 in the middle of the vertical pipe 2
When pulling out cable 1 laterally from
When it is necessary to change the installation direction of the cable, the sliding plate 7 is subjected to the entire weight of the cable 1 existing in the vertical pipe 2 and a huge tension at the end when the cable is pulled out. The sliding plate 7 is made sufficiently solid so as to have the ability to impart a predetermined bending radius to the cable 1 and the ability to withstand the weight of the cable and the tension at the tip when the cable is pulled out;
However, the structure is complicated and large, and not only is it not easy to manufacture, but it also requires the construction of a large-scale support for installing it. Also, installing sliding plates at high places is very dangerous.

(2) Since it is necessary to permanently support the entire cable 1 by securing the vicinity of the tip of the cable 1 exposed outside the vertical pipe 2, a special gripping tool is required for cables that do not have mesh wires attached. Development becomes essential.

(3) With triplex cables, it is difficult to pull out only the required cores laterally.

The present invention has been made in order to solve the problems of the prior art described above, and is effective for installing electric cables in vertical pipes, especially when installing several cable cores in vertical pipes. The aim is to provide an internal cable installation method.

[Means for Solving Problems] The feature of the cable laying method in a vertical pipe of the present invention is that a plurality of cable cores are twisted together in a triplex shape on a mesh wire that has protrusions provided at predetermined intervals. The cable core group is made to include the protrusion of the Messenger wire and to be locked to the protrusion, so that the cable wire is held by the Messenger wire. The core group is installed in a vertical pipe.

[Example] Hereinafter, an example of the cable installation method in a vertical pipe according to the present invention will be described with reference to FIGS. 1 to 3.

Embodiment 1 FIG. 1(a) shows a cable core group formed into a triplex shape by twisting around a metsenger wire 9 in which oval projections 10 are provided at predetermined intervals.
An explanatory diagram of a case in which the wire is pulled straight up to the top of the vertical pipe 2 by the metsenger wire 9, (b) shows the A-A cross section of the above (a), and (c) shows the same < B-B cross section. FIG. The egg-shaped protrusion 1
0 is formed by an aluminum mold or a plastic mold, and the cable core group 1 is twisted so as to wrap around the protrusion 10. Since the cable core group 1 is locked to the messenger wire 9 by the protrusion 10, there is no need for any holding fittings or the like for restraining the cable core group 1 to the messenger wire 9.

A wire lobe 61 is connected to the tip of the mesh wire 9 via an untwister 3, and the wire lobe 61 is further connected to a winch 5 via a metal wheel 4 installed above the vertical pipe 2. It is. The cable core group 1 is laid by first winding up the wire lobe 61 with the winch 5 to pull the cable 1 to a predetermined position, and then fixing the mesh wire 9 at an appropriate location above the vertical pipe 2. be exposed. As described above, according to the method of the present invention, the cable core group is always held by the metsenger wire, and no excessive weight is applied to the tip of the cable 1, so it is not necessary to use a special gripping tool for supporting the cable. No development required. Furthermore, since the weight of the cable in the vertical pipe is shared and supported by the Messenger wire, the reliability is extremely high compared to the conventional installation method in which the tip of the cable is held at one point. Further, since it is not necessary to tighten the cable core group and the metsenger wire using a gripper, damage to the cable is not caused.

Embodiment 2 FIG. 2 is an explanatory diagram in the case where a desired core in the cable core group 1 of the same triplex type as in the first embodiment is pulled out from the intermediate opening 8 of the vertical pipe 2. To explain the difference from the first embodiment, in order to draw the desired wire core 100 out of the vertical pipe 2 through the opening 8, the upper part of the tribrake type cable core group 1 is untwisted by the required length in advance, and this unraveling Connect the wire core of the
Fix it with the retainer 11 along the line. Since the wire core group below the untwisted portion is restrained by the door-shaped protrusion 10 to the Messenger wire 9, no special measures such as attachment of a restraining device are required. In this embodiment, two winches 51 and 52 are prepared, and first, the winch 51 pulls up the cable 1 until its tip reaches the vicinity of the opening 8 in the middle of the vertical pipe 2, and the desired wire core 100 is inserted into the cable wire. While pulling out the wire from the core group 1, the top and bottom of the oval projection 10 of the Messenger wire 9 are restrained with retainers 11 so that the remaining wire cores do not come loose. After that, the wire grip 12 is attached to the tip of the wire core group 100, the wire lobe 62 is connected via the untwister 3, and the winches 51 and 52 are gradually moved to obtain the desired wire core. 100 out of the opening 8 and the remaining two wire cores are pulled up to the top of the pipe 2.

In this embodiment, since the triplex type cable core group 1 in the vertical pipe 2 is held by the wire 9 to the metsenger, the desired wire core 100 can be pulled out laterally with an arbitrary bending radius. Therefore, it is possible to omit the use of sliding plates, which are indispensable in conventional installation methods. Further, when supporting the wire core 100 pulled out from the opening 8, it is sufficient to use an extremely simple cable gripping tool since no overcurrent is applied to the wire core 100.

Embodiment 3 FIG. 3 shows an example in which three ordinary single-core cables are laid at once without twisting the cable cores as in the first to second embodiments. Since the cable core group 1 is not twisted like in a triplex cable, in order to ensure that the cable core group 1 is locked by the oval protrusion of the Metzenger wire, a vertical wire is attached to the Metzenger wire 9. It is necessary to bind the upper and lower portions of the oval protrusion 10 over the entire length of the cable core group 1 that has been laid down using a retainer. The cable core group 1 brought into close contact with the Metsenger wire 9 by the retaining member 11 is locked and held by the Metsenger wire 9 by the oval protrusion 10 as in the case of the triplex type cable core group. . The rest of the installation procedure is the same as in the second embodiment.

[Effects of the Invention] As explained in the above embodiments, the cable installation method in a vertical pipe of the present invention involves twisting a group of cable cores around a metsenger wire in which egg-shaped protrusions are arranged at predetermined intervals. Alternatively, it is a method of laying the cable vertically, restraining the cable core group to the Metsenger wire by the oval projection of the Metsenger wire, and laying and supporting the cable while holding the cable with the Metsenger wire. It is economical, reliable, and does not require the production or construction of large-scale equipment for installation work such as sliding boards, or the development of special gripping tools for cable support.
Cables can be laid inside vertical pipes with excellent safety, and are extremely useful in industry.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the first embodiment of the present invention, (a) is a diagram for explaining the outline of the installation method, and (b) is a diagram for explaining the outline of the laying method.
Section A shows cross section A, and (c) shows cross section B-B. FIGS. 2 and 3 are explanatory diagrams of second and third embodiments of the present invention, respectively. Figures 4 and 5 are explanatory diagrams of the conventional cable installation method in a vertical pipe. Figure 4 shows the cable being pulled up to the upper end of the vertical pipe, and Figure 5 shows the cable being pulled up from the opening in the middle of the pipe. Regarding the drawer teeth)
'! E is a diagram showing the main points. 1: Cable core group, 2: Vertical pipe, 3: Untwister, 4: Metal wheel, 5.51.52: Winch, 6.61.62: Wire lobe 7: Slip plate, 8: Pipe opening, 9: Metsenger wire, 10: Charge protrusion, 11: Retainer, 12: Wire grip 100: Cable core. With Makoto

Claims (1)

[Claims] A cable core that is vertically supported or twisted around a messenger wire having oval protrusions provided at predetermined intervals, and that is anchored to the messenger wire by encompassing the oval protrusions of the messenger wire. A method for laying cables in a vertical pipe, characterized in that the group is laid in a vertical pipe while being held by the messenger wire.