JPS6392207A - Method of installing cable in vertical conduit - 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 Application Field] The present invention relates to a method of laying a cable in, for example, a tower pedestal of a pipe-type IDN tower or a m-pipe.

More specifically, the present invention provides a novel system capable of supporting within the vertical conduit a cable mold that rides within the vertical conduit. This invention relates to a conduit cable installation method.

[Prior art l] For laying a cable in a vertical conduit, for example, there is a method of pulling the cable straight up to the top of the vertical conduit and holding it in place near the upper end of the vertical conduit, or There is a method of pulling it up to a predetermined position, pulling it out of the pipe by a predetermined length from an opening in the middle of the vertical pipe, and holding the exposed portion outside the pipe near the opening with a gripping tool. but,
The method of laying a cable is basically the same regardless of the conditions at the installation site, and the cable is drawn in by winding a wire rope connected to the tip of the cable itself, and then exposed outside the pipe after being pulled out. The part is held in place by a gripping tool. That is, both during the cable pulling work and after the work is completed, the square section of the cable in the U conduit is supported near the distal end of the cable.

In the following, a conventional tIl conduit-cable installation method will be described. Referring to FIGS. 3 and 4, after pulling the cable up to a predetermined position in the vertical conduit, The explanation will be based on an example of installation in which the cable is pulled out and held. FIG. 3 is a diagram showing an overview of the cable installation situation, in which a wire row 761 is connected in advance to the tip of the cable 1 via an untwister 3, and the wire lobe 61 is connected to the vertical conduit 2. It is connected to the winch 5 via the outer metal wheel 4. 7 is a sliding plate, and the opening 30 of the vertical pipe 2
When laying cable 1 by bending it from vertical to horizontal direction, such as when pulling cable 1 out from
When laying cable 1 by bending it from horizontal to vertical direction, etc.
It is used in places where the direction of cable installation is changed.
For example, the opening 30 is given a predetermined curvature to
The purpose is to prevent damage to the cable 1 due to such causes.

During the installation work, first, the winch 5 winds up the wire lobe 61 to draw the cable 1 into the vertical conduit 2, and then the cable 1 is pulled out of the vertical conduit 2 by a predetermined length through the opening 30. . Thereafter, as shown in FIG. 4, the cable 1 pulled out of the pipe is held near the opening 30 by grippers rJ, 8 to support the cable inside the vertical pipe. Note that 9 in FIG. 4 is a protection pipe that is attached to the frontage section 30 after the sliding plate 7 has been removed.

[Problems with the prior art] As mentioned above, the conventional cable installation method in a vertical conduit does not have a means for supporting the cable inside the vertical conduit. The entire weight of the cable will be concentrated near the tip of the cable. Therefore, the following problems occur particularly when the cable is bent in the horizontal direction or when a cable with a large diameter of mm is laid.

First, the sliding plate 7 is used when pulling out the cable 1 from the intermediate opening 30 of the vertical conduit 2 or when pulling the cable 1 up to the upper end of the vertical conduit 2 and bending it laterally near the upper end of the vertical conduit. It was extremely difficult to manufacture. In other words, in the case of a heavy cable, the sliding plate 7 not only gives the cable 1 a predetermined bending radius, but also sufficiently withstands the full weight of the cable 1 riding in the vertical conduit 2 and the tension at the end when the cable is pulled out. It must be manufactured to have the performance that can be achieved. In addition, it is necessary to construct a large-scale support to support the slide plate 7, and fixing the slide plate 7 to the support requires extremely dangerous work at high places.

On the other hand, the gripping tool 8 for permanently supporting the cable after it has been pulled out of the vertical conduit also has a problem due to the cable being supported at one point. A special gripping tool that can support the heavy lifting of the cable at the inner self-hanging part is required, and it takes a lot of time to develop this gripping tool, and the manufacturing and fixing of the gripping tool is similar to the above-mentioned sliding plate. . In order to strengthen the cable supporting force, the cable may have a special structure with a tension member, and the tension member may be fixed near the cable grip to reduce the burden on the cable grip, but ordinary cables cannot be laid. Since this is not a method that can be used in actual situations, the development of a fundamental solution has been long awaited.

The present invention has been made to solve the problems in the prior art described above, and provides a new cable installation method in a vertical conduit that can support the cable square portion within the vertical conduit. That is.

[Means for Solving Problems] The feature of the cable installation method in a flute passageway according to the present invention is that two or more filament bodies vertically installed on the sides of the cable are used as guides to install the cable in the hole that will become the cable insertion hole. A plurality of sets of split rings whose positions are gradually shifted are successively fitted into the cable near the bottom of the vertical conduit while the cable and the filament are pulled up, and the cable is held at a predetermined position in a snake state by the plurality of sets of split rings. After the cable has been pulled up, a split ring support is attached directly below the lowermost stage of the split ring and fixed to the inner surface of the vertical pipe, thereby supporting the cable within the vertical pipe.

[Function] The holes of the plurality of sets of split rings stacked inside the vertical conduit pass through the plural sets of split rings in the longitudinal direction of the vertical pipe in a snake-like manner. Therefore, the cable fitted into the hole of the split ring is prevented from falling due to the frictional force between the cable and the hole of the split ring. On the other hand, the split ring itself is supported downwardly by the ring support, so that the cable is supported within the vertical conduit.

[Example] Hereinafter, an example of a method for installing a cable in a vertical conduit according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a diagram showing a situation during cable installation according to the method of the present invention, in which 1 is a cable with a wire lobe 61 suspended from a yoke 11 via an untwister 3 connected to its tip. be. The upper end of the yoke 11 is connected to the wire row 1
63, and the wire row 763 is further connected via a metal wheel 4 above the vertical pipe line 2 to a winch 5 placed outside the pipe line. On the other hand, two wire rows 162 are separately suspended from the lower end of the yoke 11 in parallel with the wire row 761 connected to the cable 1, and each wire row 162 is connected to the filament 14 via a hook 12. It is. These two filamentary bodies hanging down along the cable 1 serve as guides for guiding the split ring 13, which will be described later. In this embodiment, a lobe of the same type as the wire 0-761 or 63 is used for the filament 14, but the material and shape may be freely selected as long as it has a predetermined strength.

Reference numeral 13 denotes a split ring each consisting of two ring units 20, which are formed so that holes 21 communicate in a snake-like manner when a plurality of ring units 20 are stacked as shown in the figure. That is, the holes 21 of each set of split rings 13 are formed at slightly different positions so that the split rings are gradually shifted when stacked. The hole 21 of the split ring 13 is an oblique hole extending from the upper surface to the lower surface of the ring, and has a rough inner surface to increase the frictional force with the cable 1. In addition, the split ring 13 must be strong, lightweight, and durable for permanent use, and is therefore preferably made of a plastic material or the like. The two ring units 20 constituting each set of split rings 13 each have a small hole through which the filament 14 passes, and also have mutual engagement means for the units, such as a tightening fitting, etc. These are not particularly illustrated.

When pulling in the cable, first, the winch 5 is driven to pull the cable 1 into the vertical conduit 2 for a predetermined length. Then,
The ring units 20 are fitted into the cables 1 one by one in the vicinity of the opening 40 for leading in the cables of the vertical conduit 20, and fixed with tightening fittings, and the cables 1 and the filament 14 are pulled up little by little. In the ring unit 20, a plurality of rough portions are inserted into the filament body 14 in the vicinity of the opening 40 outside the vertical conduit 2 in advance.

The hole 21 of the split ring 13 formed by the two ring units 20 is inclined as shown in the figure.
Since FJ friction occurs between the inner surface of the cable 1 and the cable 1, the split ring 13 will not slip down during cable retraction. After inserting one set of split rings 13 into the cable 1, the next set is similarly inserted into the cable 1, and as the cable 1 is pulled up, multiple sets of stacked rings are pulled up. The cable 1 is in a snake state within the vertical conduit 2 due to the hole 21 of the split ring 13 . After the cable 1 is pulled up to a predetermined height above the vertical conduit, a ring stopper 15 is applied to the filament body 14 immediately below the lowest stage of the split ring 13 in the stacked state as shown in FIG. A support 16 is attached to the inner surface of the vertical pipe 2 to support the entire split ring 13 from below. In addition, when fitting the split ring 13 into the cable 1, the cable 1 and the filament 14 may be pulled up intermittently each time one set of the split ring 13 is fitted, or may be pulled up continuously at a low speed. . After completing the above work, the cable 1 near the upper end of the vertical conduit 2 is fixed with a gripper and the wires 0-761 and 62 are removed, thereby completing all cable installation in the vertical conduit. Thus, according to the method of the invention, the cable 1 comprises a plurality of sets of split rings 1 supported downwardly by the ring support 16.
Since the cable 1 is laid in a snake-like manner inside the cable 3 to prevent it from falling, it is sufficient to use a gripping tool with an extremely simple structure for holding the cable 1. In addition, if the weight of the cable 1 is particularly large, each time one or more sets of split rings 13 are fitted into the cable 1, in order to eliminate the concentration of weight at the tip of the cable during installation work, body 1
The weight of the cable 1 can be distributed to the filament 14 by attaching a ring retainer to the wire lobe 62 and supporting the split ring with the filament 14 connected to the wire lobe 62.

Incidentally, even when the distal end of the cable 1 is pulled out laterally from the middle opening 30 of the vertical conduit 2 as shown in FIG. This is the same as when the pipe is pulled straight up to the top of the vertical pipe 2. Hereinafter, points specific to horizontal draw-out will be explained with reference to FIG. 2. When the split ring 13 fitted into the cable 1 is pulled up to the vicinity of the opening 30 in FIG. A ring support 16 is attached directly below the lower stage and is fixed to the inner surface of the vertical pipe to support the entire split ring 13 downward, and the cable 1 is supported within the vertical pipe 2. Thereafter, the wire lobe for pulling up the cable 1 and the wire lobe for pulling up the filament 14 are removed, and the cable 1 is pulled out from the opening 30 using the lateral pull-out lobe newly connected to the tip of the cable 1.

In FIG. 2, 7 is a sliding plate used for pulling out the cable 1 in the lateral direction, and similar to that used in the conventional laying method, it gives the cable 1 a predetermined bending radius when changing the laying direction of the cable 1. At the same time, the opening 30
The purpose is to prevent damage to the cable 1 due to etc., but as mentioned above, '! Since the cable 1 is supported within the vertical conduit by r1 sets of split rings 13, ring supports 16, etc. and then pulled out of the conduit, an excessive weight is not placed on the sliding plate. Therefore, no special sliding plate development is required when using the method of the invention. In addition, each time one or several sets of split rings 13 are fitted into the cable 1, a ring retainer is used to hold the part immediately below them, and only the lobes for pulling up the cable are separated, and the cable 1 is supported by the filament body 14. The cable can then be pulled out laterally before the ring support 16 is fixed in the vertical conduit 2.

[Effects of the Invention] As explained above, in the method for laying a cable in a vertical conduit according to the present invention, a plurality of sets of split rings with holes whose positions are gradually shifted are fitted into the cable and fixed in the vertical conduit. As a result, the cable can be supported within the vertical conduit, so there is no need to develop a special and complicated sliding plate or cable gripping tool, since no excessive weight is placed on the cable tip when pulling out or gripping the cable laterally. This method is extremely useful industrially because cables can be laid easily, safely, and with high reliability in a vertical conduit without causing any damage.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of an embodiment of the cable installation method in a vertical conduit based on the present invention, and FIG. 2 is an explanatory diagram of a case in which the cable is pulled out laterally from an opening in the middle of the vertical conduit. , and FIGS. 3 to 4 are explanatory diagrams of a conventional method for laying pipes in vertical pipes. 1: Cable, 2: Pipeline, 3: Untwister, 4: Metal wheel, 5: τ inch, 61.62.63: Wire lobe, 7: Sliding plate, 8: Cable grip tool, 9: protection pipe, 30140: opening, 12:), 13: split ring, 14: wire body, 15: ring retainer, 16: ring support, 20: ring unit, 21: split ring hole. M I mouth

Claims (1)

[Claims] (1) When laying a cable into a vertical conduit, two or more filamentary bodies vertically installed along the cable being pulled up into the vertical conduit are used as guides to guide the cable to the filamentous body. A plurality of sets of split rings are formed in the vertical conduit, and the positions of the holes of each set are gradually shifted so that the holes become snake-shaped when stacked in the longitudinal direction of the filament. The cable and the filament are pulled up while being fitted into the cable one after another near the bottom, and after the cable is pulled up to a predetermined position in a snake state, it is inserted into the inner surface of the vertical conduit directly below the plurality of sets of split rings. A method for installing a cable in a vertical conduit, characterized in that the cable is supported in the vertical conduit by attaching a split ring support.