JP2003018715A - Laying method and device for optical cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laying method and a device for an optical cable capable of eliminating lead-in and in-feed work in a drawing-in manhole in a lead-in construction for the optical cable. SOLUTION: For leading and laying the optical cable C in an end point side manhole He from a lead-in start point side manhole Hs that are connected with each other through a buried pipe conduit P while at least one drawing-in manhole Hp is provided in the midpoint therebetween, a plurality of guide rollers 2, 3 are arranged in advance between openings Pa, Pa of the buried pipe conduit that face the inside of the drawing-in manhole Hp provided in the midpoint, an offset guide path 1 of the optical cable C is formed, and thereafter, the optical cable C is led in.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to laying of an optical cable for communication, and more particularly to a method and apparatus for laying an optical cable which is effective when applied to an existing buried pipeline system on which a cable for electric power or communication is laid. .

[0002]

2. Description of the Related Art To lay an optical cable for communication (optical fiber cable) in the ground, generally, an existing buried pipeline system on which a cable for electric power, communication, etc. is laid is used.

When laying the optical cable C, as shown in FIG. 6, the optical cable C is located between the manhole Hs on the pulling start point side where the closure (junction box) B is installed and the closest manhole Hp to the ground. It is drawn into the manhole Hp through the buried pipeline P buried in the. Further, when two or more pulling manholes Hp are installed between the manhole Hs on the pulling start point side where the closure B is installed and the manhole He on the end point side, the optical cable C is the first pulling manhole. From Hp to the next passing manhole Hp These passing manholes Hp, H
It is drawn in through the buried pipeline P between p, and the drawing work between these pulling manholes Hp, Hp is sequentially repeated, and then the manhole He on the end point side where the closure B is installed is drawn in through the buried pipeline P. .

The manhole Hs in which the closure B is installed,
In He, the work of connecting the optical cables via the relay closure B and the work of sending the optical cable C to the pulling manhole Hp are performed, while in the pulling manhole Hp, the optical cable sent from the manhole Hs on the starting point side. Retracting work of C and next pulling manhole H
The work of sending the optical cable C to p is performed.

As the manholes Hs and He on the retracting start side and the retracting side where the closure B is installed, those which are generally installed in a place where daytime construction is possible are selected. On the other hand, the pull-through manhole Hp is often installed in a place where traffic jams are likely to occur, such as near intersections and along roads, which necessitates nighttime construction.

[0006]

However, since the electric power / communication cable is congested in the pulling manhole Hp in the existing buried pipeline system, the optical cable C inside the manhole Hp is congested.
It is not easy to pull in and feed in, and especially when the number of pulling manholes Hp is large, it becomes a serious work, which causes a decrease in work efficiency and a rise in construction cost. In addition, the work in the pull-through manhole Hp is often a night work depending on the traffic conditions and road conditions as described above, and as a result, the entire pulling work of the optical cable C may be a night work. However, this resulted in lower work efficiency and higher construction costs.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to omit the pulling-in and sending-in work in the pulling manhole at the time of pulling in the optical cable, and at the same time, the whole construction can be performed in the daytime. It is therefore an object of the present invention to provide an optical cable laying method and device which can rationalize pulling in work, improve work efficiency, and reduce construction cost.

[0008]

In order to achieve the above object, an optical cable laying method according to the present invention is provided with at least one manhole between a manhole on a starting point side and an end point side of an optical cable with a closure installed. In addition to installing individual pulling manholes, connecting these manholes with a buried conduit, and laying the optical cable by pulling the optical cable from the manhole on the starting point side toward the manhole on the end point side through the passing manhole, Prior to the pulling in of the optical cable, a plurality of guide rollers are arranged between the buried conduit openings facing each other in the pulling manhole to form an offset guide path for the optical cable, and then the optical cable is pulled in. Is characterized by.

According to the optical cable laying method of the first aspect, when the optical cable is passed through the manhole on the starting point side where the closure is installed and fed into the manhole, the optical cable passes through the offset guiding path formed in the pulling manhole. , The next pulling manhole or the manhole on the end point side where the closure is installed is sent. Therefore, it is possible to omit the work of pulling in or feeding the optical cable by the worker entering the pull-in manhole when pulling in the optical cable. Further, even if the intermediate manhole is installed in a place that cannot be opened in the daytime, it is not necessary to open it, so that the optical cable can be installed during the daytime.

In addition, since the offset guide path in the pull-through manhole is formed by a plurality of guide rollers, it is possible to guide the pull-through optical cable by detouring (offset) in a direction that does not interfere with the existing equipment. Since the guide is caused by the rotation movement of each guide roller, the optical cable can be efficiently detoured and pulled through without causing resistance or damage due to sliding.

According to a second aspect of the present invention, after the optical cable is pulled in, the optical cable in the pulling manhole is held by an existing support structure in the pulling manhole, and each of the guides forming the offset guiding path. The roller may be removed.

According to the optical cable laying method of the second aspect, the optical cable in the pulled-in pull-through manhole can be stably held, and at the time of laying another cable,
It is possible to prevent the guide rollers arranged in the pull-through manhole from becoming an obstacle. It is also advantageous in that each removed guide roller can be used for another pulling work.

In the optical cable laying device according to the present invention, at least one pulling manhole is installed between the manhole on the starting side of the optical cable and the manhole on the ending side, each of which is provided with a closure. In the laying device of the optical cable, which is configured to connect the optical cable from the manhole on the starting point side to the manhole on the end point side through the manhole on the starting point side, In order to form an offset guide path for the optical cable, a deflection guide roller that deflects and guides the optical cable and a direct guide roller that guides the optical cable in a straight direction are arranged in combination, and the guide rollers are also drawn through the manhole. Brackets for mounting on existing support structures or temporary support columns inside Wherein the through bets are detachably attached.

According to the optical cable laying device of the third aspect, between the buried conduit openings in the pull-through manhole,
Since the offset guide path of the optical cable formed by a plurality of guide rollers is provided, the optical cable can be continuously drawn from the manhole on the start point side to the manhole on the end point side through the offset guide path formed in the manhole. . Therefore, it is possible to omit the work of the worker entering the pull-in manhole during the pulling-in operation to pull in or feed the optical cable. Further, even if the intermediate manhole is installed in a place that cannot be opened in the daytime, it is not necessary to open it, so that the optical cable can be installed during the daytime.

In addition, since the offset guide path in the pull-through manhole is formed by arranging a combination of a deflection guide roller for deflecting and guiding the optical cable and a direct guide roller for guiding in the straight direction, the pull-in optical cable is formed. Can be guided by offsetting in a direction that does not interfere with existing equipment, and because the guidance is caused by the rotational movement of each guide roller, it is efficient without causing resistance or damage due to sliding of the optical cable. It is possible to guide the detour and take it through.

Further, since the deflection guide roller and the direct guide roller are detachably attached to the existing support structure or the temporary support column, after the drawn optical cable is held in the existing support structure, the guide rollers are removed and temporarily installed. The support posts can also be removed and removed, avoiding these obstacles when laying another cable.

According to a fourth aspect of the present invention, the deflection guide roller has a planar outer shape of a rectangular shape, a main body frame on which the bracket is mounted, and a guide provided on a front portion of the main body frame. A guide frame provided with a roller and a bending guide roller provided at the rear, and the guide roller comprises a support frame in which a pair of columns is erected on both sides of the front end of a rectangular support substrate, and the inside of the columns on both sides of the support frame. A pair of side flat rollers arranged to face each other, and an upper part that is arranged between the upper ends of the columns on both sides of the rollers and that can be rotated and retracted outward with one column side as a fulcrum. A flat roller and a lower drum-shaped roller arranged immediately in front of the flat roller are provided, and the rear portion of the support substrate is connected to the main body frame through a fixing bolt, The bending guide roller has a structure in which the end side can be deflected to the left and right. A pair of free arms connected to each of them, a pair of side flat rollers arranged inside the columns of the free arms on both sides to face each other, and between the upper ends of the columns on both sides, The upper flat roller that can be rotated and retracted outward with the strut side as a fulcrum, and the two parts located at the tip of the free arm and immediately in front of the flat roller The first drum and the second V-shaped roller connected to and supported by the arm are provided, and the rear end of the universal arm is tilted downward to change the tilt angle with respect to the main body frame. Type roller and first V type low By changing the vertical relative positions of the over and a second V-type rollers can be assumed to be a change configurable radius of curvature bending with respect to the optical cable to induce.

According to the optical cable laying device of the fourth aspect, the deflection guide roller has the lower V-shaped roller of the guide roller provided at the front portion thereof and the first V-shaped roller of the bending guide roller provided at the rear portion thereof. Since the vertical relative position between the optical fiber and the second V-shaped roller is changed to change the radius of bending curvature with respect to the guiding optical cable, the guiding optical cable should be deflected in a predetermined direction with a curvature within a specified range. In addition, in the first and second V-shaped rollers, since the optical cable is guided by two-point contact, the contact load of the optical cable to be pulled and bent can be dispersed and reduced to guide the bending without difficulty.

Further, a pair of side flat rollers facing each other and an upper flat roller positioned above them are provided on the front guide roller and the rear bending guide roller, so that they are routed. It can be guided without deviating from the optical cable.

Further, since the front guide roller is connected to the main body frame so that the front end side can be deflected to the left and right, the direction of the optical cable introduced and led out via the guide roller is relative to the main body frame. Even if the optical cable is slightly deflected, the optical cable can be stably introduced and led out by adjusting the deflection angle of the end portion.

Furthermore, since the upper flat rollers provided at the front and rear of the deflection guide roller are provided so as to be able to rotate and retract, by retracting these upper flat rollers after the optical cable is pulled in. , The deflection guide roller can be removed and removed by releasing the engagement with the optical cable.

According to a fifth aspect of the present invention, the direct guide roller is formed into a short rectangular tube shape in which one side portion is cut and opened, and a mounting bracket is attached to the lower side portion thereof. Support frame, the upper flat roller and the lower flat roller arranged to face the inside of the upper side and the inside of the lower side of the support frame, and the inside of the side that is the closing side of the support frame. Side flat rollers arranged in
The collapsible side flats are arranged between the opening side end portions of the upper side portion and the lower side portion of the support frame, and can be pivotally retracted downward toward the side with the lower side portion as a fulcrum. And a mold roller.

According to the optical cable laying device of the fifth aspect, the direct guide rollers form a square-shaped guide path by the side flat rollers and the upper and lower flat rollers which are arranged to face each other. Therefore, it is possible to guide in the straight direction without deviating from the optical cable. Also, the collapsible side flat roller on the opening side of the support frame is
Since it is provided so that it can be rotated and retracted, after retracting the optical cable, by rotating and retracting the flat side roller, the engagement with the optical cable is released, and the direct guide roller is removed and removed. You can

According to a sixth aspect of the present invention, the bracket has a short angled main body having a U-shaped cross section and two lower longitudinal sides of the main body with a space therebetween in the longitudinal direction. Provided between the two clamp screws, which are provided between the two clamp screws, which are screwed in toward the opposing upper side portions to grip the mounting counterpart member, and which are provided between the two clamp screws toward the opposing upper side portions. A drop-out prevention screw that is screwed in and enters the engagement hole that is provided in the mounting counterpart member in advance and prevents the drop-out, and an XY that is orthogonal to the outside of the upper side and the outside of the side of the main body. It may be provided with two roller mounting screws protruding in two directions.

According to the optical cable laying device of the sixth aspect, the bracket holds the attachment partner member with the two clamp screws, and the fall prevention screw provided between them is provided in advance on the attachment partner member. The bracket itself and the guide roller connected to the bracket itself are prevented from damaging the optical cable by being dropped due to load and vibration when the optical cable is pulled through because it is configured to enter the engaged hole. You can Further, even when there is a restriction on the mounting direction of the bracket, either one of the two roller mounting screws provided in the two orthogonal X-Y directions and the rotation direction on the roller mounting screw are selected. The deflection guide roller and the direct guide roller connected to the bracket can be held and fixed in a predetermined direction by selecting the angle.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below.
This will be described with reference to FIGS.

FIG. 1 is an explanatory view of an optical cable drawing-in procedure according to the present invention, and FIG. 2 is a perspective view showing a schematic structure of an offset guide path provided in a drawing manhole.

In FIG. 1, Hs is a manhole on the pull-in start point side where the closure B is installed, Hp is a pull-through manhole, He is a manhole on the pull-in end point where the closure B is installed, and P is each manhole Hs, Hp, and He. The buried pipeline, C, is an optical cable buried in the ground between. The pull-through manholes Hp are installed between the manhole Hs on the starting point side and the manholes He on the end point side, and the number thereof is set at two places in the illustrated example, but there may be more than one.

The optical cable C to be laid is composed of two manholes Hp, which are drawn from the manhole Hs on the pull-in start point side.
Although it is drawn into the manhole He on the end point side through Hp, in this example, as shown in FIG. 1, prior to this drawing, the buried conduit opening P facing each through manhole Hp is shown.
The offset guide path 1 of the optical cable C formed by arranging a plurality of guide rollers 2 and 3 is provided between a and Pa, and then the optical cable C is pulled in.

Here, as shown in FIG. 2, the offset guide path 1 in the pulling manhole Hp includes a deflecting guide roller 2 for deflecting and guiding the optical cable C, and a direct guide roller 3 for guiding in a straight direction. And a plurality of them are combined and detachably attached to the existing support structure 5 or the temporary support pillar 6 in the pull-through manhole Hp via the mounting bracket 4, and the pull-through optical cable C is installed in the existing power / communication cable or closure. It is formed by arranging along a direction in which the device is detoured (offset) in a direction that does not interfere with the equipment.

In this way, each pulling manhole Hp is previously prepared.
In the present example in which an offset guide path 1 formed by a plurality of guide rollers 2 and 3 is provided between the buried conduit openings Pa, Pa in the inside, a wire guide rope G is connected to the leading end of the optical cable C on the lead-in side. And the extended guide rope G
From the pull-in start point side through the manhole Hs on the end point side through the manholes Hp, Hp, and the offset guide route 1 in each of the manholes Hp, Hp, so that the subsequent optical cable C follows the same route as shown in FIG. It can be pulled through continuously. Therefore, at the time of this pull-in, it is not necessary for the worker to enter the inside of the manholes Hp, Hp for pulling in or pulling out the optical cable C.

Further, in this example, after the optical cable C is pulled in, the optical cable C in the pulling manholes Hp, Hp is moved to the existing support structure 5 (for example, a standing member, a receiving member, a support, etc.) in the pulling manholes Hp, Hp. The guide rollers 2, 3 and the temporary support column 6 forming the offset guide path 1 are removed while being held by a cable support fitting such as a separate support). In this case, the optical cable C in the pull-through manholes Hp and Hp can be stably held, and it is possible to prevent the guide rollers 2 and 3 and the temporary support column 6 from becoming an obstacle when laying another cable. it can. In addition, the removed guide rollers 2 and 3 are used for drawing in another optical cable C.

Further, the deflection guide roller 2 and the direct guide roller 3 of the present example forming the offset guide path 1 are constructed as described below.

3A and 3B are views showing a schematic structure of the deflection guide roller. FIG. 3A is a side view and FIG.
3A is a rear side view, FIG. 3C is a perspective view, and FIG. 3D is a perspective view taken along the arrow A in FIG. 3C.

The deflection guide roller 2 is shown in FIG.
As shown in (d), a main body frame 9 to which the mounting bracket 4 is attached, a guide roller 10 provided at the front portion of the main body frame 9 and a bending guide roller 20 provided at the rear portion thereof are provided. .

The body frame 9 is shown in FIG.
As shown in FIGS. 3 (c) and 3 (d), a pair of side plates 9a, 9a, which are flat plates having a constant width and are arranged in parallel at a predetermined interval, are provided at a substantially central portion in the front-rear direction. The lower edge parts are integrally connected by a flat plate-shaped central bridge plate 9a on which the bracket 4 is mounted, and the upper edge parts of the front end parts are integrally connected by a substantially square front bridge plate 9c. The outer shape of the plane is rectangular.

The guide rollers 10 are arranged on the front bridge plate 9c of the main body frame 9, and are provided on both sides of the front end portion of a support substrate 11a having substantially the same shape as the front bridge plate 9c, as shown in FIG.
As shown in FIG. 3C and FIG. 3D, the pair of columns 11
b and 11b, and a pair of side flat rollers 12 and 1 rotatably arranged so as to face the insides of the columns 11b and 11b on both sides of the support frame 11.
2 and an upper flat roller 13 that is rotatably arranged between the upper portions of the columns 11b on both sides of the same and that can be rotated and retracted outward with one column 11b as a fulcrum. The lower flat hourglass roller 14 is rotatably arranged on the supporting substrate 11a positioned immediately in front of the side flat rollers 12, 12.

The guide roller 10 is shown in FIG.
As shown in (a), the widthwise center of the support substrate 11a near the rear is passed through a fixing bolt 15 that penetrates the support substrate 11a and the front bridge plate 9c of the lower body frame 9 The front end side is connected to the main body frame 9 so as to be deflectable to the left and right. Then, as necessary, as shown in FIG. 3D, a state in which the front end side is deflected by a predetermined angle with respect to the body frame 9 or a state in which the axes are aligned is selected, and the front side of the body frame 9 is selected. It is configured to be fixed in a selected state by an angle fixing pin 9d provided with a screw provided on the front end of the partial bridge plate 9c and having its tip end abutted against the lower surface of the front end of the support substrate 11a.

On the other hand, the bending guide roller 20 has a column 21b standing upright at the rear end of the main body 21a having a flat plate shape with a constant width, and as shown in FIGS. 3 (a) and 3 (c), The substantially central portion of the main body portion 21a is connected to the rear end portions of the side plates 9a, 9a on both sides of the main body frame 9 via tightening bolts 26 to form a pair of free arms 21, 21 on both sides of the rear portion. As shown in FIG. 3 (b), the columns 21 b and 21 b of the free arms 21 and 21 on both sides are provided.
A pair of side flat rollers 22 and 22 rotatably arranged facing each other inside and the upper ends of the columns 21b and 21b on both sides thereof are rotatably arranged and one column 21b is provided.
Positioned on the upper flat roller 23 that can be pivoted and retracted outward with the side as a fulcrum, and the front ends of the free side arms 21 and 21 on both sides and the pair of side flat rollers 22 and 22. 2 free arms 21, 21 on both sides
It is provided with two first and second V-shaped rollers 24 and 25 that are rotatably connected and supported.

Then, the rear end portions of the free arms 21, 21 are tilted downward to change the inclination angle with respect to the main body frame 9, so that the lower drum-shaped roller 14, the first V-shaped roller 24, and the second The radius of the bending curvature with respect to the guided optical cable C can be changed by changing the vertical relative position to the V-shaped roller 25.

In the deflection guide roller 2 of the present embodiment having the above-mentioned structure, a pair of side flat rollers 12, which are opposed to the front guide roller 10 and the rear bend guide roller 20,
Since 12, 22 and 22 and the upper flat rollers 13 and 23 arranged above them are respectively provided, it is possible to guide the optical cable C through which the optical cable C is drawn without deviating. Further, since the upper flat rollers 13 and 23 are configured to be rotatable and retractable, the upper flat rollers 13 and 23 are pivotally retracted after the optical cable C is retracted to engage with the optical cable C. Then, the deflection guide roller 2 can be removed and removed.

Further, since the front guide roller 10 has a structure in which the front end side can be deflected to the left and right, the direction of the optical cable C introduced and led out via the guide roller 10 is with respect to the main body frame 9. Even when the optical cable C is slightly deflected, the optical cable C can be stably introduced and led out by adjusting the deflection angle.

By changing and adjusting the inclination angle of the rear bending guide roller 20 with respect to the main body frame 9, the lower drum-shaped roller 14 of the front guide roller 10 and the first V-shaped roller of the same bending guide roller 20 can be adjusted. 24 and the second V
Since the radius of the bending curvature with respect to the guided optical cable C can be changed by changing the relative position in the vertical direction with respect to the mold roller 25, the optical cable C can be deflected in a predetermined direction with a curvature within a specified range. Then, in the first and second V-shaped rollers 24 and 25 located in the bending guide portion,
Since the optical cable C is guided by two-point contact, it is possible to reduce the contact load of the optical cable C that is bent and bent, and bend and guide the optical cable C without difficulty.

FIG. 4 is a diagram showing a schematic structure of the direct guide roller, FIG. 4 (a) is a front side view and FIG. 4 (b) is a perspective view.

As shown in FIGS. 4 (a) and 4 (b), the direct guide roller 3 is formed in a short rectangular tube shape in which one side portion is cut and opened, and the lower side thereof is formed. A support frame 31 on which a mounting bracket 4 is mounted, and the inside of the upper side portion 31a and the lower side portion 3 of the support frame 31.
An upper flat roller 32 and a lower flat roller 33, which are rotatably arranged so as to face the inner side of 1c, and a side portion, which is rotatably arranged inside a side portion 31b that is a closing side of the support frame 31. It is rotatably arranged between the flat roller 34 and the opening side end portions of the upper side portion 31a and the lower side portion 31c, and can be rotated and retracted outward with the lower side portion 31c side as a fulcrum. And the inclinable side flat roller 35.

In the direct guide roller 3 of the present embodiment having the above-mentioned structure, the side flat rollers 34, which are arranged to face each other,
35 and the upper and lower flat rollers 32, 33 form a square-shaped guide path, so that the optical cable C can be guided in a straight direction without deviating from the optical cable C. Further, the collapsible side flat roller 35 on the opening side of the support frame 31 is
Since it is configured to be pivotally retracted, the retractable side flat roller 25 is pivotally retracted after the optical cable C is pulled in to release the engagement with the optical cable C and remove the direct guide roller. Can be removed.

FIG. 5 is a diagram showing a schematic structure of a mounting bracket to be mounted on the guide roller, and FIG.
Is a front view and FIG. 5B is a side view.

The bracket 4 has a U-shaped cross section in the form of a short angle, and a main body portion 41 in which two U-shaped stiffening members 42 are arranged at two positions spaced apart in the longitudinal direction.
It is provided at two locations in the longitudinal direction of the lower side portion 41c of the main body portion 41 at intervals, and is screwed toward the facing upper side portion 41a as shown in FIG. Two clamp screws 43 for holding the omitted mating member
Is provided between the two clamp screws 43, is screwed in the direction of the opposing upper side portion 41a, and penetrates into an engagement hole provided in advance in a mounting counterpart member (not shown), Fall prevention screw 44 that prevents the bracket 4 from falling off
And the outside of the upper side 41a of the body 41 and the side 41
The guide rollers 10 and 20 are provided at the base end portions of the guide rollers 10 and 20 so as to project from the outside of the b toward two directions of XY orthogonal to each other.
Two roller mounting screws 4 with swivel seat 45a
5 and.

In the bracket 4 of the present embodiment having the above-described structure, the two clamp screws 43 hold the mounting mating member, and the fall prevention screw 44 provided between them is provided in the mounting mating member in advance. Since the bracket itself and the guide rollers 2 and 3 connected to the bracket itself are prevented from falling due to load and vibration when the optical cable C is pulled, it is possible to reliably prevent the optical cable C from being damaged. it can. Further, even when the mounting direction of the bracket 4 is restricted, either one of the two roller mounting screws 45 provided in the two XY directions and the rotation on the roller mounting screw 45 are selected. By selecting the angle of the direction, the deflection guide roller 2 and the direct guide roller 3 connected to the bracket 4 can be held and fixed in a predetermined direction.

When it is mounted on the direct guiding roller 3, the roller mounting screw 45 is loosely tightened so that the direct guiding roller 3 swings following the deflection of the optical cable C being pulled. To reduce the resistance, and when fixing is needed,
As shown by the alternate long and short dash line in (b), one of the roller mounting screws 45 is attached to the support frame 3 of the direct guide roller 3.
It is also possible to attach a detent plate 46 that abuts 1 to prevent swinging.

In the present embodiment, the offset guide path 1 of the optical cable C formed by combining the deflection guide roller 2 and the direct guide roller 3 having the above-described structure is provided in each of the pull-through manholes Hp, Hp.・ It is possible to forcefully detour (offset) in a direction that does not interfere with existing equipment such as communication cables and closures, and because the guidance is caused by the rotation movement of each guide roller, the optical cable C can be prevented from sliding resistance or damage. Without causing
It is possible to efficiently guide and pass around.

Therefore, as described above, when the optical cable C is pulled in, the operator pulls it through the manhole H.
Enter the inside of p and Hp to pull in the optical cable C,
The work of sending out is unnecessary. As a result, it is possible to carry out the pulling-in work only during the daytime, since it is sufficient to enter and leave the manholes Hs and He on the pulling-in start point side and the end point side, which are often possible. It was

[0053]

As described above, in the method of laying an optical cable according to the present invention, a plurality of guide rollers are arranged in a pulling manhole to form an offset guide path for the optical cable. It is possible to omit the work of pulling in an operator in the pull-in manhole and the work of sending in when pulling in the optical cable. As a result, the entire lead-in work can be performed in the daytime, and thus the lead-in work of the optical cable can be rationalized, work efficiency can be improved, and work cost can be reduced.

The optical cable laying method according to claim 2 is:
After pulling in the optical cable, each guiding roller that formed the offset guiding path in the pulling manhole is removed, so that it is possible to avoid those guiding rollers from becoming an obstacle when laying another optical cable and guiding them. Effectively, the roller can be used for another pulling work.

In the optical cable laying device according to the present invention, since the offset guide path of the optical cable formed by combining the deflection guide roller and the straight-ahead direct guide roller is provided in the pull-in manhole, the pull-in manhole is pulled in when the optical cable is pulled in. It is possible to omit having an operator inside to pull in the optical cable or perform a feeding operation. Further, even if the intermediate manhole is installed in a place that cannot be opened in the daytime, it is not necessary to open it, so that the optical cable can be installed during the daytime. In addition, the offset guide path is formed by a combination of a deflection guide roller that deflects and guides the optical cable and a direct guide roller that guides the optical cable in a straight direction, so that the optical cable to be pulled through cannot be interfered with existing equipment. It is possible to guide without detouring (offset), and since the guiding is performed by the rotation movement of each guiding roller, the optical cable can be guided efficiently without causing resistance or damage due to sliding. In addition, since each guide roller is detachably attached, it is possible to avoid these obstacles when laying another cable by removing and removing the guide rollers after pulling in the optical cable. As a result, it is possible to rationalize the work of pulling in the optical cable, improve the work efficiency, and reduce the construction cost.

The optical cable laying device according to claim 4 is
The deflection guide roller can change the radius of bending curvature with respect to the guided optical cable to deflect the optical cable in a predetermined direction with a curvature within a prescribed range. In addition, the first and second guide cables located in the bending guide section can be used. Since the V-shaped roller guides the optical cable by two-point contact, the contact load of the optical cable to be pulled and bent can be dispersed and reduced to smoothly guide the bending. In addition, even if the direction of the optical cable that is introduced and led out via the guide roller is slightly deflected with respect to the main body frame, the front guide roller deflects the front end side to stably introduce the optical cable.・ Can be derived. Further, since the upper flat rollers provided at the front and rear portions can be rotated and retracted, the upper flat rollers can be rotated and retracted after the optical cable is pulled in, so that the engagement with the optical cable is released. The deflection guide roller can be removed and removed.

The optical cable laying device according to claim 5 is:
Since the direct guide roller forms a square-shaped guide path with the side flat rollers and the upper and lower flat rollers arranged opposite to each other, it is possible to guide in the straight direction without deviating from the optical cable. it can. In addition, since the one flat side flat roller can be rotated and retracted, the retractable flat roller can be rotated and retracted after the optical cable is pulled in to engage with the optical cable. Solve
The direct guide roller can be removed and removed.

The optical cable laying device according to claim 6 is:
Since the mounting bracket has a captive screw between the two clamp screws, the bracket itself and the guide roller connected to it drop due to load and vibration when the optical cable is pulled through and damage the optical cable. It can be surely prevented. Even if the mounting direction of the bracket is restricted, XY
The deflection guide roller and the direct guide roller connected to the bracket by selecting one of the two roller mounting screws provided in the two directions and the angle of the rotation direction on the roller mounting screw. Can be held and fixed in a predetermined direction.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an optical cable drawing construction procedure according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a schematic configuration of an offset guide path provided in the pulling manhole according to the embodiment.

3A is a side view showing a schematic configuration of a deflection guide roller according to the embodiment, FIG. 3B is a rear side view of FIG. 3A, and FIG. 3C is a perspective view. 3 (d) is shown in FIG. 3 (c).
FIG.

FIG. 4 (a) is a front side view showing a schematic configuration of a direct guide roller according to the embodiment, and FIG. 4 (b) is a perspective view.

FIG. 5 (a) is a front view showing a schematic configuration of a mounting bracket attached to the guide roller according to the embodiment, and FIG. 5 (b) is a side view.

FIG. 6 is an explanatory view of a conventional optical cable drawing-in procedure.

[Explanation of symbols]

1 Offset guidance route 2 deflection guide roller 3 Direct induction roller 4 Mounting bracket 5 Existing support structure 6 Temporary support pillars 9 Body frame 10 Guide roller 11 Support frame 11a support substrate 11b prop 12 side flat rollers 13 Upper flat roller 14 Lower drum roller 15 Fixing bolt 20 Bending induction roller 21 Free arm 21a main body 21b prop 22 Side flat roller 23 Upper flat roller 24 First V-shaped roller 25 Second V-shaped roller 26 Tightening bolt 31 Support frame 32 Upper flat roller 33 Lower flat roller 35 Foldable side flat roller 41 Body 42 Stiffener 43 Clamp screw 44 Captive screws 45 Roller mounting screw B closure C optical cable He end point side manhole Hs starting point side manhole Hp through manhole P buried pipeline Pa buried conduit port

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hideki Ichihara             3-3-22 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture             Kansai Electric Power Co., Inc. (72) Inventor Isao Kuroda             5-8 Kitakagaya, Suminoe-ku, Osaka-shi, Osaka             No. 102 Kansai Electric Power Co., Inc.             Inside the construction site (72) Inventor Shoji Nakazawa             1 Stock Association at 166 Ichibacho, Ono City, Hyogo Prefecture             Inside Daiwa Seisakusho F-term (reference) 2H038 AA21 CA68

Claims (6)

[Claims] 1. At least one pulling manhole is installed between the manhole on the starting side and the manhole on the ending side of the optical cable, each of which is provided with a closure, and these manholes are communicated with each other by a buried pipeline.
A method of laying an optical cable in which an optical cable is drawn from a manhole on a starting point side and drawn through a manhole toward a manhole on an end point side to be laid, in which, before the drawing of the optical cable, a space between buried conduit openings facing the drawing manhole is provided. In the method of laying an optical cable, a plurality of guiding rollers are provided to form an offset guiding path for the optical cable, and then the optical cable is retracted. 2. After pulling in the optical cable, the optical cable in the pulling manhole is held by an existing support structure in the pulling manhole, and each guiding roller forming the offset guiding path is removed. 1
The method of laying the described optical cable. 3. At least one pulling manhole is installed between the manhole on the starting side of the optical cable and the manhole on the ending side, each of which is provided with a closure, and these manholes are communicated with each other by a buried pipeline.
In the laying device of the optical cable configured to pull the optical cable from the manhole on the start side to the manhole on the end side through the manhole, the offset guidance of the optical cable is provided between the buried conduit openings facing the pulling manhole. In order to form a path, a deflection guide roller that deflects and guides the optical cable and a direct guide roller that guides in a straight direction are arranged in combination, and the guide rollers are passed through the existing support structure or temporary support in the manhole. An optical cable laying device, which is detachably attached to a pillar via a mounting bracket. 4. The deflection guide roller has a planar outer shape of a rectangular shape, a main body frame on which the bracket is mounted, a guide roller provided on a front portion of the main body frame, and a rear portion of the main body frame. And a guide frame provided with a pair of support columns standing on both sides of the front end of a rectangular support substrate, and the guide rollers are disposed so as to face each other on the inside of the support columns on both sides of the support frame. And a pair of side flat rollers, and an upper flat roller that is arranged between the upper ends of the columns on both sides and is capable of turning and retracting outward with one column as a fulcrum. A lower drum-shaped roller disposed immediately in front of the flat roller is provided, and the rear portion of the support substrate is connected to the main body frame via a fixing bolt so that the front end side can be deflected left and right. The bending guide roller has a pair of pillars which are erected at the rear end of the main body portion, and a central portion in the front-rear direction connected to both sides of the rear end portion of the main body frame through tightening bolts. The flexible arm, a pair of side flat rollers arranged to face the inner side of the columns of the flexible arms on both sides, and the flexible arms are arranged between the upper ends of the columns on both sides, and one side of the columns is a fulcrum for the outside. An upper flat roller that can be rotated and retracted toward one side, and two portions located at the tip of the free arm and immediately in front of the flat roller, and connected and supported by the free arms on both sides. Two lower V-shaped rollers, the first V-shaped roller and the first V-shaped roller, are provided by tilting the rear end of the universal arm downward to change the tilt angle with respect to the main body frame. Mold roller and second V-shaped law By changing the vertical relative position of the over laying apparatus of the optical cable of the curvature radius of the modifiable configuration as has been and claim 3, wherein the bending for cable guiding. 5. The direct guide roller is formed in a short-angled tubular shape in which one side portion is cut and opened, and a support frame for mounting the bracket on the lower side portion thereof,
The upper flat roller and the lower flat roller arranged to face the inner side of the upper side and the inner side of the lower side of the support frame, and the side arranged on the inner side of the side that is the closing side of the support frame. It is arranged between the flat type roller and the opening side end portions of the upper side portion and the lower side portion of the support frame, and can be rotated and retracted downward with the lower side portion as a fulcrum. The laying device for an optical cable according to claim 3, further comprising: a retractable side flat roller. 6. The bracket is provided with a short angled main body having a U-shaped cross section, and two lower side portions of the main body, which are spaced apart from each other in the longitudinal direction and are opposed to each other. Two clamp screws that are screwed in the direction of the upper side to grip the attachment partner member, and are provided between the two clamp screws, and are screwed in the direction of the opposite upper side to be attached. A drop-out prevention screw that enters into an engagement hole provided in the side member in advance to prevent the drop-out, and a protrusion in two directions X-Y orthogonal to the outer side of the upper side and the outer side of the side of the main body. 6. The optical cable laying device according to claim 3, 4 or 5, further comprising two roller mounting screws provided.