JPH09298818A - Cable laying device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly lay a cable by preventing a master wire for dragging a cable from falling off a sheave. SOLUTION: A chain of sheaves 20 which have pulleys which form a pair in two pieces are arranged at a specified interval downward on a cable laying course. Then, a master wire 30 is stretched along a cable laying course, being laid obliquely across around each pulley in every pair. It follows that stretching the master wire 30 obliquely across will have the master wire 30 given tension also from the pairs of sheaves 20 and 20, in addition to the initialized tension by a pulley 40 for tension adjustment. Accordingly, the master wire 30 increases in tension by the amount of the tension by the pairs of sheaves 20, so even if there is a bend in the cable layering course, the master wire 30 can be prevented from falling off the pairs of sheaves 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cable laying device, and more particularly to a cable laying device for laying an electric cable on a cable laying route at a construction site of a building.

[0002]

2. Description of the Related Art Conventionally, as a cable laying apparatus of this type, the applicant of the present application has disclosed its structure and its construction method in Japanese Patent Application Laid-Open No. 7-123554. According to this cable laying device, first, a plurality of pulleys are arranged at predetermined intervals along the cable laying path, and a parent wire is hung on these pulleys to be connected in a loop. Then, the branch wire is connected to an arbitrary position of the parent wire, the tip of the cable is connected to the branch wire, and then the parent wire is pulled by a winch to move around the cable laying path. As a result, the cable is unwound from the cable drum and laid in the cable laying path.

In the cable laying device, a pulley having a different diameter in which one of the two wall portions of the groove is removed is used as the pulley, and a cable receiving roller is connected to the pulley having the different diameter. . Further, a separation piece having a diameter larger than the groove width of the pulley is fixed to the branch wire, and the separation piece rides on the groove of the different diameter pulley when the branch wire passes through the different diameter pulley. As a result, the branch wire drops off from the wall cutting side of the groove of the different diameter pulley and is transferred onto the cable receiving roller. This separates the cable from the parent wire and lays it in the cable laying path.

[0004]

However, since the conventional cable laying device has a structure in which the parent wire is simply put on the groove of the pulley with a different diameter and is hung over, the cable laying path has a bending portion exceeding the limit in the traveling direction. In some cases, the disadvantage is that the parent wire frequently falls off the pulley. The present invention has been made in view of such circumstances, and an object of the present invention is to provide a cable laying device capable of smoothly laying a cable by preventing a parent wire from falling off a pulley.

[0005]

In order to achieve the above object, the present invention provides a method in which a cable is connected to a parent wire via a branch wire and the parent wire is pulled along a cable laying path. In a cable laying device for laying a cable in the cable laying path, at least two sets of pulley sheaves are arranged downward along the cable laying passage at predetermined intervals, and the pulleys of the pulley sheave The cable is laid by slantingly crossing the parent wires and pulling the parent wires.

According to the first aspect of the present invention, the pulley chains are arranged at predetermined intervals in the cable laying route, and the parent wires are slantingly crossed over the pulley lanes to stretch the parent wires in the cable laying route. Set up. When the parent wire is stretched in this way,
Since the parent wire is given tension from the pulley string in addition to the initial tension, the tension is increased by the tension of the pulley string as compared with the conventional device in which the parent wire is simply placed in the groove and hung around. . Therefore, according to the present invention, the parent wire does not fall off the pulley even if the cable laying path has a bend exceeding the limit. Further, according to the present invention, since the pulley pulleys are arranged downward, it is possible to arrange the pulley pulleys without taking up space even in a narrow cable laying route which is restricted in the height direction.

According to a second aspect of the present invention, the arrangement interval of the pulleys of the pulley chain is set to 5D ≧ P (D: groove diameter of pulley, P: distance from axis of pulley to adjacent axis of pulley). It has been set. If the distance P exceeds 5D, the gap between the pulleys becomes too wide, and thus the parent wire may fall off from the pulley even if the parent wires are slanted. Therefore, in the present invention, the arrangement interval is set to 5D ≧ P to reliably prevent the parent wire from falling off.

According to a third aspect of the present invention, a guide roller for guiding the parent wire is installed in the cable laying path between the pulley chains. By installing the guide roller in this way, it is possible to prevent the parent wire from hanging down between the pulley pulleys, so that it is possible to prevent the parent wire from falling off the pulley pulleys. The invention according to claim 4 particularly relates to a branch wire, wherein the branch wire and the cable are connected by a twist prevention jig to prevent the cable from twisting with respect to the branch wire. This can prevent the cable from being entangled with the parent wire. Then, when the branch wire passes through the pulley chain, the leading piece provided on the branch wire separates the branch wire from the groove of the pulley, and the separation piece provided on the branch wire causes the branch wire to drop from the pulley. , The cable is laid in the cable laying route. Therefore, the cable can be laid smoothly.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of a cable laying device according to the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is an overall side view in which a cable laying device according to an embodiment of the present invention is applied for laying an electric cable 10, and FIG. 2 is a sectional view taken along line 2-2 in FIG. As shown in FIG. 1, the laying route of the cable 10 is formed in a two-story structure with the long cable trays 12 and 14, and the space 16 between the cable tray 12 and the cable tray 14 and the cable tray 14 are provided. The upper space 18 is used as a cable laying space.

In the laying space 16, three pulley chains 2 are provided.
0, 20 ... Are arranged at a predetermined interval. As shown in FIG. 2, these pulley chains 20, 20, ... Are removably fixed to a support beam 22 of the cable tray 14 via a mounting jig 24. Similarly, in the laying space 18, three pulley stations 20, 20 ... Are arranged at a predetermined interval, and these pulley stations 20, 20 ... Are beams extending above the cable tray 14. It is removably fixed to 26 through a mounting jig 28. The pulley block 20 will be described later.

As shown in FIG. 1, the parent wire 30 for pulling the cable 10 is stretched over the three sheave stations 20, 20, ... In the laying space 16 and upward from the guide roller 32 on the left side in the figure. After being turned around, it is guided to the laying space 18 via the winch drive pulley 34. The parent wire 30 guided to the laying space 18 is hung from the guide roller 36 to the three pulley chains 20, 20 ... Then, the parent wire 30 is turned downward from the guide roller 38, and then guided to the laying space 16 via the tension adjusting pulley 40 and the guide roller 42.
Therefore, the parent wire 30 is connected in a loop along the cable laying path. The parent wire 30 thus connected has an initial tension set by the tension adjusting pulley 40, and is rotated around the cable laying path by the rotational driving force of the driving pulley 34.

FIG. 3 is a plan view seen from the line 3-3 in FIG. The parent wire 30 shown in the same figure is stretched around the pulleys 21, 21 of the pulley string 20 constituted by two pairs in an oblique manner. Therefore, the parent wire 30 is moved circularly in a state where tension is applied from the pulley string 30 in addition to the initial tension set by the tension adjusting pulley 40. Each pulley 2
As shown in FIG. 4, the reference numerals 1 and 21 are axially supported by the connecting plate 44 and arranged downward, and the attachment jigs 24 and 28 are fixed to the connecting plate 44. Further, as shown in FIG. 5, the interval between the pulleys 21 of the pulley block 20 is D, the groove diameter of the pulley 21 is D, and the distance from the axis 21A of the pulley 21 to the axis 21A of the adjacent pulley 21 is P. Then, 5D ≧ P
Is set to Further, as shown in FIG. 4, in each pulley 21, the upper side wall 21C of both side walls 21C and 21D of the groove 21B is formed as a large diameter different diameter pulley, and the parent wire 30 is prevented from coming off from the side wall 21C. To prevent.

By the way, the parent wire 30 is connected in a loop through two free wires 46, 46, as shown in FIG. As shown in FIGS. 4 and 5, both ends of the free wire 46 are connected to the connecting ring 48 and the twist preventing jig 5.
The parent wire 30A on one side and the parent wire 30B on the other side are connected via 0. The twist prevention jig 50
Is for canceling the relative twist between the parent wires 30A and 30B. Even if the twist prevention jig 50 twists the wire due to the tension of the parent wire 30 or the twist occurs due to other causes, the free wire is free wire. The twist 46 can prevent twisting by a slight component of the tension acting on the branch wire 52.

Therefore, the parent wire 30 and the branch wire 52 can move around without being entangled. When the parent wire 30 is twisted, the parent wire 30 moves in a direction to return the twist, and as a result, it may move around at a position outside the cable laying route. For example, the parent wire 30 is moved around without being separated from the cable laying route.

On the other hand, the branch wire 52 to which the cable 10 is connected has its tip end connected to the connecting wheel 48. A cable grip 56 is connected to the rear end of the branch wire 52 via a twist prevention jig 54, and the tip of the cable 10 is gripped by the cable grip 56. The twisting prevention jig 54 cancels out relative twisting between the branch wire 52 and the cable 10, and the twisting prevention jig 54 pulls the cable 10 onto the parent wire 30 without twisting. When the cable 10 is twisted, the cable 10 may be entangled with the parent wire 30. By canceling the twist in this way, the cable 10 is pulled without being entangled with the parent wire 30.

A leading piece 58 is fixed to the branch wire 52. The leading piece 58 is formed in a conical shape whose diameter increases from the front end portion to the rear end portion, and the branch wire 52 penetrates and is fixed to the center thereof. Also,
A separation piece 60 is provided behind the leading piece 58. The separation piece 60 is formed to have a diameter larger than the groove diameter of the pulley 21, and the branch wire 52 is penetrated and fixed to the center of the separation piece 60.

Next, a method of laying the electric cable 10 by the cable laying device constructed as described above will be described. First, the drive pulley 34 shown in FIG. 1 is rotationally driven by a winch to move the parent wire 30 in an orbital manner.
The winch is stopped when 6 is located at the cable laying start position. Next, as shown in FIGS. 4 and 5, the tip of the cable 10 is fixed to the cable grip 56 of the branch wire 52, and the tip of the branch wire 52 is connected to the connecting ring 48 of the free wire 46.

In this state, the winch is re-driven to rotate the drive pulley 34 in the clockwise direction in FIG. 1 so that the parent wire 30 is moved along the cable laying path. As a result, the cable 10 starts to be pulled by the parent wire 30 via the branch wire 52, is unwound from the cable drum 61, and is sequentially laid on the cable receiving roller 62 without being entangled with the parent wire 30. That is,
The cable 10 is first laid in the laying space 16 on the lower floor by the circular movement of the parent wire 30, and
It is guided to the laying space 18 on the upper floor and laid in this space 18.

While the parent wire 30 is moving around the parent wire 30, the parent wire 30 is slanted around the pulley stations 20, 20, ... Is also moved with tension applied. Therefore, in the present embodiment, the tension is increased by the tension due to the pulley chain, as compared with the conventional device in which the parent wire is simply placed in the groove and hung, and therefore even if there is a bend in the cable laying path. The parent wire 30 does not fall off the pulley blocks 20, 20 ...

In the present embodiment, the pulley block 20 is used.
Since the is arranged downward, the pulley string 20 can be arranged without taking up a space even in a narrow laying space which is restricted in the height direction. Further, in the present embodiment, the arrangement interval between the pulleys 21, 21 of the pulley block 20 is set to 5D ≧ P (D: groove diameter of pulley,
P: distance from the axis of the pulley to the axis of the adjacent pulley). When the distance P exceeds 5D, the pulley 21
Since the gap between the pulley 21 and the pulley 21 becomes too wide, the desired tension cannot be obtained, and the parent wire 30 may fall off from the pulley 21, but in the present embodiment, the arrangement interval is 5D ≧ P. Since it is set to, it is possible to prevent the parent wire 30 from falling off.

When the cable 10 is laid to a predetermined position in such a state, the winch is stopped. And
After removing the branch wire 52 from the parent wire 30 and the cable 10 from the cable grip 56,
The cables 10 laid on the cable receiving rollers 62, 62 ... Are transferred onto the cable trays 12, 14. This completes the work of laying one cable 10.
When laying a plurality of wires, the above-mentioned work may be repeated.

In the present embodiment, the pulley 20 having the pair of pulleys 21 and 21 is described, but the invention is not limited to this. For example, as shown in FIGS. 6 and 7, three pulleys 21, 21, 21 may be combined to form a pulley block. If three pulleys 21, 21, 21 are used, as shown in FIG.
And the derivation direction B can be corrected in a straight line. Accordingly, the branch wire 52 can be prevented from meandering, so that the cable 10 can be laid on a straight line.

Further, although a pulley having a different diameter is used as the pulley 21 in the present embodiment, the pulley is not limited to this, and a standard pulley having both walls with the same diameter is used as shown in FIGS. May be. Further, if a guide roller that guides the parent wire 30 is installed in the cable laying path between the pulley stations 20, the hanging of the parent wire 30 between the pulley stations 20 can be prevented. It is possible to reliably prevent the parent wire 30 from falling off.

Further, in the present embodiment, Japanese Patent Laid-Open No. 7-123 is used.
The different-diameter pulley disclosed in Japanese Patent No. 554 can also be used together. For example, if the different-diameter pulleys are arranged between the pulley pulleys 20, a small number of pulley pulleys 20 can be used even in a relatively long cable laying route.
Can be addressed. In this case, the branch wire 52 passes through the groove of the different diameter pulley, but the leading piece 58 provided on the branch wire 52 rides over the groove of the different diameter pulley to separate the branch wire 52 from the groove of the different diameter pulley. And the separation piece 6
When 0 abuts on the different diameter pulley 21, it completely separates from the groove and falls off the different diameter pulley 21. Therefore, the cable 10 can be laid smoothly even if the different diameter pulley is applied.

[0025]

As described above, according to the cable laying apparatus of the present invention, the pulley chains are arranged downward in the cable laying path at predetermined intervals, and the parent wires are obliquely crossed to these pulley chains. Since the cable is laid over and stretched, the parent wire can be reliably prevented from falling off the pulley even if there is a bend in the cable laying path.

[Brief description of drawings]

FIG. 1 is an overall side view showing a cable laying device according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the cable laying device viewed from line 2-2 in FIG.

FIG. 3 is a partial plan view of the cable laying device as seen from line 3-3 in FIG.

FIG. 4 is a side view showing a pulling state of a branch wire and a cable passing below the pulley string.

FIG. 5 is a plan view of the pulley chain or the like seen from line 5-5 in FIG.

FIG. 6 is a side view showing a set of three pulleys.

FIG. 7 is a plan view of the pulley chain shown in FIG.

[Explanation of symbols]

 10 ... Cable 12, 14 ... Cable tray 20 ... Pulley train 21 ... Pulley 30 ... Parent wire 32, 36, 38, 42 ... Guide roller 34 ... Drive pulley 40 ... Tension adjusting pulley 46 ... Free wire 50, 54 ... Twist prevention Jig 52 ... Branch wire 56 ... Cable grip 58 ... Leading piece 60 ... Separation piece

Claims (4)

[Claims] 1. A cable laying device for laying the cable on the cable laying path by connecting the cable to the parent wire via a branch wire and pulling the parent wire along the cable laying path. At least two sets of pulley sheaves are arranged downward at a predetermined interval along the cable laying route, and the parent wires are slantingly crossed over the respective sheaves of the pulley sheaves to pull the parent wire. A cable laying device, wherein the cable is laid by doing so. 2. The arrangement interval of the pulleys of the pulley series is set to 5D ≧ P, where D is the groove diameter of the pulleys and P is the distance from the axis of the pulley to the axis of the adjacent pulley. The cable laying device according to claim 1, wherein: 3. The cable laying device according to claim 1, wherein a guide roller for guiding the parent wire is installed in the cable laying path between the pulley chains. 4. A cable laying device for laying the cable in the cable laying path by connecting the cable to the parent wire via a branch wire and pulling the parent wire along the cable laying path. At least two pulley sheaves arranged downward at a predetermined interval along the cable laying path and on which the parent wires are crossed obliquely; and a branch wire for connecting the branch wire and the cable. A twist prevention jig for preventing the cable from twisting with respect to the branch wire, a spherical separation piece provided on the branch wire and having a diameter larger than the width of the groove of each pulley of the pulley string, and the separation piece A cable laying provided with a conical leading piece provided on a front branch wire and having a large diameter portion at its rear end formed to be larger than the width of the groove of the pulley. Location.