JP2000261925A - Device for pull-out cable laid in conduit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a worker to guide a cable to the output of a manhole without giving damages to the cable by easily and nearly vertically raising the cable by bending the cable on the bottom of the manhole by himself. SOLUTION: A device for drawing-out cable is composed of a fixed section 10 arranged on the bottom of a manhole 3, a vertically movable section 20, a pulley 30 for changing direction used for vertically raising a cable 1, a pulley position adjusting means 40 which moves the movable section 20 with respect to the fixed section 10, and a cable pulling-up means 50 for pulling up the cable 1. The fixed section 10 is provided with downwardly extendible height adjusting means 14a and 14b, and the pulley position adjusting means 40 is provided with a shaft 41, having a male screw engaged with the female screw of the fixed section 10 in the lower part of the movable section 20. In addition, the cable pulling-up means 50 is provided with a belt 52 and a belt winding device 53 with a backstop mechanism.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an in-pipe cable pulling device for pulling out a cable already laid in a pipe connected to a manhole to the outside.

[0002]

2. Description of the Related Art Deterioration of performance of cables such as communication cables buried underground in expressways, general roads, and other places is inevitable due to aging. Therefore, in order to maintain high reliability, it is necessary to periodically exchange a new cable. However, in many cases, rust, dust, sand, etc. accumulated over a long period of time in a certain conduit passing through the cable increase the friction between the conduit and the cable passing through the cable, and it is difficult for humans to pull out the cable. It's not easy. Moreover, the inside of the manhole is small and usually only fits one worker.

On the other hand, when working at the bottom of a manhole, it is almost impossible to apply a horizontal pulling force to the cable because there is no margin around the manhole. Some types of cables cannot be bent below a certain radius.
In such a case, if the cable is forcibly pulled, the cable is cut. Therefore, conventionally, when the cable is cut, the old cable is left as it is (so-called burying), and if there is a spare auxiliary hole, a new cable may be passed using the auxiliary hole. . In addition, a new hole may be dug to bury a new conduit, through which a new cable may be routed. Although various tools for introducing a new cable into a new conduit have been provided, they are useless for pulling out an old cable.

[0004]

As described above, when the cable already buried in the pipeline is to be replaced with a new cable, if the cable is cut off, the cable is usually cut off as described above. They had to bury old cables and use auxiliary holes or drill new holes to fill the pipeline. For this reason, digging a hole over a long distance along a road and laying a new pipeline without using the original pipeline is extremely wasteful in both cost and labor.

[0005] Even if there is an auxiliary hole and it can be used, there is a problem that if the cable needs to be added later, the auxiliary hole may not be used in some cases. . An object of the present invention is to solve such a problem and to provide a cable laying apparatus in a conduit that can easily bend the cable at the bottom of the manhole, stand up almost vertically, and guide the cable outside the manhole. It is.

[0006]

The present invention solves the above-mentioned problems by the following means. In addition,
In order to facilitate understanding, description will be given with reference numerals corresponding to the embodiments of the present invention, but the present invention is not limited thereto. That is, the invention according to claim 1 provides a fixing portion (1) for disposing on a bottom surface of a manhole (3) connected to a conduit (2) in which a cable (1) to be pulled out is laid.
0), a movable part (20) that can move up and down with respect to the fixed part (10), and a cable (1) that is laid horizontally is set up substantially vertically in the manhole (3). Direction changing means (30) attached near the lower end of the movable part (20); and the movable part (30) for pulling up the cable (1) which has been raised substantially vertically by the direction changing means (30). And a cable pulling means (50) attached to the pipe 20.

According to a second aspect of the present invention, there is provided the cable pulling device according to the first aspect, wherein the fixing portion (1
In order to move the movable part (20) up and down with respect to 0), the fixed part (10) or the movable part (20)
And a position adjusting means (40) for adjusting the position of the direction changing means attached to any of the above.

According to a third aspect of the present invention, in the cable pull-out apparatus according to any one of the first and second aspects, the fixing portion (10) corresponds to local irregularities on the bottom surface of the manhole. And a height adjusting means (14a or 14b).

[0009] The invention of claim 4 is the invention of claims 1 to 3.
The cable pulling device according to any one of the above, wherein the cable pulling means (50) comprises:
And a ratchet mechanism for preventing reverse rotation (53).

[0010]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of the present invention. FIG. 1 is an explanatory view (a cross-sectional view substantially cut along a center line of a manhole) showing the device of the present invention in use. FIG. 2 is a perspective view showing an outer shape of a fixing portion of the device shown in FIG. FIG. 3 is a perspective view showing a structure of a movable portion of the apparatus shown in FIG. FIG. 4 shows the fixing part of FIG. 2 and FIG.
FIG. 4 is an explanatory view (perspective view) showing a main part of the movable part in a state where the movable part is assembled.

As shown in FIG. 1, an in-pipe cable laying apparatus (hereinafter, referred to as the present apparatus) of the present invention is used by being arranged on a bottom surface 3a of a manhole (see FIG. 4).
The pipe 2 is connected to the manhole 3. A cable 1 to be pulled out is laid in the conduit 2. As shown in FIG. 4, the fixing portion 10 of the present device is arranged to face the opening of the conduit 2. The movable section 20 is engaged with the fixed section 10 and is capable of sliding up and down.

As shown in FIG. 2, the fixing portion 10 is provided with a notch portion 12 having a substantially U-shaped cross section and a vertically long notch portion 12 extending upward from the lower end. Certain blocks 13a, 13b and 15 are fixed. The notch 12 is provided to allow the cable 1 that has come out of the conduit 2 (manhole side) to be inserted from below the fixed part 10. Since the blocks 13a and 13b are screwed to the male screws of the legs 14a and 14b for height adjustment, respectively, the legs 14a or 14b are rotated to expand and contract to correspond to local irregularities on the bottom surface of the manhole. Left and right tilts can be corrected.

As shown in FIG. 3, the movable portion 20 has a U-shaped cross section slightly smaller than that of the fixed portion 10, and
A direction changing pulley 30 and a fitting 23 are fixed to a channel steel member 21 which can be slidably fitted inside the fixing portion 10. The direction changing pulley 30 is attached near the lower end of the outer surface of the back of the channel steel member 21 having a U-shaped cross section. The direction changing pulley 30 is for raising the cable 1 laid horizontally in the manhole 3 substantially vertically. The joint 23 is made of the channel steel 2
The first pulley 30 for direction change is fixed near the upper end on the same plane as the surface to which the pulley 30 is fixed. The joint 23 is for engaging the hook 53 a of the belt winding device 53.

The pulley position adjusting means 40 moves the movable section 20 up and down with respect to the fixed section 10 so that the direction changing pulley 3
0 is adjusted to be at an appropriate position in front of the opening of the conduit 2. FIG. 5 is a block diagram of block 1 in FIG.
FIG. 5 is a cross-sectional view cut along an xz plane that includes No. 5; As shown in FIGS. 4 and 5, the block 15 of the fixed portion 10 is screwed to the male screw portion 41 a of the vertical position adjusting shaft 41 of the pulley position adjusting means 40 attached to the movable portion 20.

As shown in FIGS. 1 to 4, the pulley position adjusting means 40 includes a vertical position adjusting shaft 41 provided inside the channel steel member 21 of the movable portion 20, and a vertical position adjusting shaft 41.
Is constituted by a handle 42 for turning the. The lower end portion of the vertical position adjusting shaft 41 has a male screw portion 41a.
The upper part of the vertical position adjusting shaft 41 penetrates the lid 22 closing the upper end of the channel steel material 21 and is connected to the handle 42. The flange 41 b is rotated by the handle 42 to rotate the shaft 4.
When the first member 1 is raised, the lid 22 is simultaneously lifted to slide the entire movable portion 20 upward.

The cable pulling means 50 is for pulling up the cable 1 vertically raised by the direction changing pulley 30. This cable pulling means 50
Is a connector 5 which can be detachably fixed to the end of the cable 1.
1, a belt 52 for lifting the coupling tool 51, and a belt winding device 53 for winding the belt 52 from the end.

The winding device 53 incorporates a ratchet wheel device 56 for preventing reverse rotation in order to give directionality to rotation for winding. Ratchet car device 5
The belt 52 can be wound around the winding device 53 from the end by rotating the handle 57 connected to 6 up and down. A hook 53a is attached to an upper portion of the belt winding device 53. Hook 53a
Is for coupling to the fitting 23 of the movable part 20 when used.

When the apparatus shown in FIGS. 1 to 5 is used, the notch 1 of the fixing portion 10 is provided in front of the opening of the pipe 2.
The device is set up on the bottom surface 3a of the manhole so that 2 comes. At this time, the end of the cable 1 which extends to some extent from the opening is placed so that the fixing part 10 straddles from above. If there is unevenness on the bottom surface 3a of the manhole, the leg 14a or 14b is turned to extend and contract the leg so as to correct the left and right inclination so that the apparatus stands substantially vertically along the longitudinal axis of the manhole 3.

Next, in order to prevent the cable from being damaged when the cable is pulled out, the handle 42 of the vertical position adjusting shaft 41 is turned to adjust the direction changing pulley 30 to the optimum position with respect to the end of the cable 1. I do. The hook 53 a of the belt winding device is hung on the metal fitting 23 of the movable portion 20, and the coupling tool 51 is fixed to the end of the cable 1. From this state, by operating the handle 57 and winding the belt 52 from the end to the winding device 53, the terminal portion of the cable 1 whose direction has been changed vertically by the direction changing pulley 30 is connected to the manhole 3. Can be pulled up to near the ground opening. If the cable 1 can move in this initial operation,
Since the close contact with the pipeline 2 is released, the work becomes easy.

Further, in order to send out the cable 1 and completely pull it out of the manhole 3, the lock of the belt winding device is released, the belt 52 is extended, and the position where the coupling tool 51 is fixed to the cable 1 is changed. The operation of winding the belt 52 with the belt winding device 53 may be repeated. The long portion of the cable 1 that has protruded above the ground may be wound up manually or automatically on a drum or the like (not shown) as appropriate.

(Other Embodiments) The present invention is not limited to the above-described embodiments, and various modifications or changes are possible, and these are also within the equivalent scope of the present invention. (1) For example, in the embodiment of FIG. 6, the drive unit 62 that rotates the vertical position adjustment shaft 41 is fixed to the upper part of the movable unit 20. The drive unit 62 includes a motor 62a and a speed converter 62b such as a worm and a worm gear. The belt winding device 63 is fixed to the upper side surface of the movable part.

(2) Although not shown, the belt winding device may be electrically driven instead of manually. Also, a means for directly pulling a cable without using a belt may be provided. (3) The work inside the manhole shall be only the first set to connect the cable terminal to the device, and all subsequent work to pull up the cable will be performed on the ground outside the manhole by operating the buttons on the operation unit (not shown). You may be able to do it.

(4) The structure and form of the fixed part and the movable part and their combination may be variously modified in addition to those shown in FIGS. 1 to 5, but any of them may be used. The same applies to the pulley position adjusting means and the cable pulling means. For example, as a pulley position adjusting means, a flat gear attached to one of a fixed part and a movable part,
It is also possible to engage the teeth of the gears attached to the other side and to have a locking function on it.

[0024]

As described above, according to the present invention,
There are various effects as follows. (1) The movable part can be moved up and down with respect to the fixed part arranged on the bottom surface of the manhole, and the movable part is provided with a direction changing means and a cable pulling means for vertically rising the cable. When pulling up, there is an effect that work can be easily performed with the least effort without carelessly damaging the cable.

(2) Since the position adjusting means is provided, the relative position between the fixed part and the movable part can be freely changed, and the position of the direction changing means can be adjusted with respect to the cable laying position.

(3) A telescopic height adjusting means is provided at the lower end of the fixing part to cope with local irregularities on the bottom surface of the manhole, so that the inclination of the apparatus can be corrected.

(4) As the cable pulling means,
Since the ratchet mechanism for preventing reverse rotation is provided, reverse rotation can be prevented when the cable is pulled up, so that the operation can be performed efficiently, and the above-described effect can be easily and specifically improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view (left side sectional view) showing an embodiment of the present invention in a use state.

FIG. 2 is a perspective view showing an outer shape of a fixing portion of the apparatus shown in FIG.

FIG. 3 is a perspective view showing a structure of a movable part of the apparatus shown in FIG.

FIG. 4 is an explanatory view (perspective view) showing a main part in a state where a fixed part and a movable part are assembled in a partially broken manner.

FIG. 5 is a sectional view cut along a plane including the xz axis in the drawing of FIG. 4;

FIG. 6 is a left side view showing the vicinity of an upper portion of a movable unit according to another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cable 2 Pipeline 3 Manhole 10 Fixed part 11, 21 Channel steel material 12 Notch part 14a, 14b Leg for height adjustment 15 Block 20 Movable part 23 Joint fitting 30 Direction change pulley 40 Pulley position adjusting means 52 Belt 53 Belt winding device 56 Ratchet car device

Claims (4)

[Claims] 1. A fixed part for arranging on a bottom surface of a manhole connected to a conduit in which a cable to be pulled out is laid, a movable part movable up and down with respect to the fixed part, Direction changing means attached near the lower end of the movable portion to raise the cable laid substantially vertically in the manhole; and to lift the cable raised substantially vertically by the direction converting means. And a cable pulling means attached to the movable portion. 2. The cable pulling device according to claim 1, wherein the movable portion is attached to one of the fixed portion and the movable portion so as to move the movable portion up and down with respect to the fixed portion. And a position adjusting means for adjusting the position of the direction changing means. 3. The cable pulling device according to claim 1, wherein the fixing unit includes a height adjusting unit corresponding to local unevenness on a bottom surface of the manhole. Characteristic cable pulling device in the pipeline. 4. One of claims 1 to 3
The cable pulling device according to claim 1, wherein the cable pulling means includes a ratchet mechanism for preventing reverse rotation.