JP4562194B2 - Overhead cable laying method - Google Patents

Description

  The present invention relates to an aerial cable laying method for laying, for example, lashing a plurality of cross-linked polyethylene cables as an aerial cable to a messenger wire laid between supports by a plurality of iron pillars or the like. .

  Usually, overhead cables of a voltage class of 22 kV or less are mainly applied to flat portions such as urban areas.

  In addition, the use of a 66 kV voltage class cross-linked polyethylene cable as an aerial cable is, for example, applied to a flat part in a private land such as a private factory.

  In addition, there is an example in which a 66 kV voltage class crosslinked polyethylene cable is used as an aerial cable, for example, in a flat track site of a railway.

  As described above, the 66 kV voltage class cross-linked polyethylene cable is applied to only the flat portion in the past even though it is used as an aerial cable. The 66 kV voltage class cross-linked polyethylene cable is used as an aerial cable. There was no case where it was applied in a mountainous area where there were many slopes and bends.

  In general, the following method has been adopted as a method of laying an aerial cable in a flat part such as an urban area.

  First, as shown in FIG. 14, a messenger wire MW is extended between the supports Q such as a plurality of iron pillars.

  14 and 15, the upper roller portion of the leading roller 21 is placed on the messenger wire MW, and one end of the pulling rope 22 is fixed in front of the connecting portion located below the leading roller 21. .

  At the same time, three aerial cables P arranged on the ground, for example, drawn from the three drums 23 are fixed to the rear of the extension yoke 16 positioned below the leading roller 21.

  Further, as shown in FIG. 18, a mounting base 25 having a plurality of curve rollers 24 arranged vertically at the retaining position of the messenger wire MW on the support Q having an inner and outer weight angle of 30 ° to 90 °. Is attached to allow the overhead cable P to pass through.

  In such a bent holding portion, the leading roller 21 and the moving roller 27 are attached from the place where the extending yoke 16 comes out of the curve roller 24.

  Further, as shown in FIG. 19, a vertically-arranged passing roller 26 is attached to the upper side surface of the support Q in the inner and outer curves so that the overhead cable P is passed through.

  Also in this case, the leading roller 21 and the moving roller 27 are attached from the place where the wire drawing yoke 16 comes out of the passing roller 26.

  Specifically, as shown in FIG. 14, the upper roller portion of the first moving roller 27 is placed on the messenger wire MW, and the lower roller portion of the moving roller 27 is connected to the leading roller 21. Place the three overhead cables P.

  As shown in FIG. 16, the moving roller 27 is provided with an upper roller portion 29 of two wheels at the upper end of an L-shaped arm 28, and three overhead cables P are placed on the lower horizontal portion. As described above, the support rollers 30 are attached in three horizontal rows.

  In addition, the connecting wire 31 connects the rear of the connecting portion located below the leading roller 21 and the lower roller portion of the first moving roller 27. The connecting wire 31 is wound around a wire winding drum 32 on the ground.

  Then, the pulling rope 22 is pulled, and the leading roller 21 is moved by about 4 m along the messenger wire MW.

  Next, the upper roller portion of the second moving roller 27 is mounted on the messenger wire MW, and the three overhead cables P connected to the leading roller 21 are placed on the lower roller portion of the moving roller 27.

  Then, the lower roller portions of the first moving roller 27 and the second moving roller 27 are connected by the connecting wire 31, the pulling rope 22 is pulled, and the leading roller 21 is moved about 4m along the messenger wire MW. Just move.

  By repeating this operation, as shown in FIG. 14, the moving rollers 27 are arranged at intervals of about 4 m along the messenger wire MW.

  In this way, the extension of the overhead cable P along the messenger wire MW is performed by pulling the pulling rope 22 attached to the leading roller 21. At this time, each of the leading roller 21 and each moving roller 27 is pulled. Since the lower roller portions are connected to each other by the connecting wire 31, no wire tension is applied to the overhead cable P itself.

  That is, since the three aerial cables P placed on the leading roller 21, each moving roller 27, and the lower roller portion of each moving roller 27 always move along the messenger wire MW, the aerial cable P It avoids the situation where wire tension is added to itself.

  Further, the leading roller 21 and each moving roller 27 are configured to automatically pass through the support Q.

  That is, as shown in FIG. 16, the arm-shaped metal fitting 33 is attached to the support Q in advance by a fastening band 33C or the like. The bracket 33 includes a fixed portion 33A for the messenger wire MW on the lower side and a hanging portion 33B for the messenger wire MW on the upper side.

  The messenger wire MW is temporarily fastened to the hanging portion 33B, and the upper roller portions of the leading roller 21 and the moving rollers 27 pass over the receiving bracket 33 so as to pass over.

  In addition, when the arrangement | positioning operation | work of each moving roller 27 is completed, the messenger wire MW is moved and fixed to the fixing | fixed part 33A of the metal fitting 33 by hand.

  Next, the worker goes up on the support Q located on the drum 23 side and installs the lashing machine LM. This lashing machine LM binds the three overhead cables P to the messenger wire MW using the lashing wire LW.

  As shown in FIG. 17, the lashing machine LM is mounted so that the three aerial cables P are brought close to the messenger wire MW and the messenger wire MW and the three aerial cables P are held.

  The lashing machine LM is generally constituted by a leading portion 6 for bundling a messenger wire MW and a cable, and a lashing machine main body 9.

  The lashing machine main body 9 is connected to the rear end side of the leading portion 6 and rotates around the leading portion 6 so as to turn around the adjacent messenger wire MW and the three overhead cables P. It is provided with a pair of left and right rotating drums 8 around which a lashing wire LW for binding the three overhead cables P to the messenger wire MW is wound.

  And the base end part by the side of the wire winding drum 32 of the connection wire 31 is cut | disconnected, and the connection wire 31 is connected to the guide part 6 of the lashing machine LM. At the same time, a pulling rope (not shown) that pulls in a predetermined direction on the ground is connected.

  At the time of lashing, an operator on the ground pulls the pulling rope by hand or pulls it with a winch, and the lashing machine LM is moved along each of the messenger wire MW and the three overhead cables.

  At this time, the lashing wire LW is pulled out from the rotating drum 8 swirling of the lashing machine LM so that the messenger wire MW and the three overhead cables P each have a double spiral shape with a pitch interval of about 20 cm or less. The lashing wire LW is continuously wound.

  The leading portion 6 of the lashing machine LM hits the upper roller portion of each moving roller 27 located in the traveling direction, and moves while pushing each moving roller 27 forward.

When the lashing for each diameter is finished, the worker collects the collected moving rollers 27 on the support Q. Further, the lashing machine LM is manually set to the next diameter. And the lashing operation | work between the following diameters is performed.
nothing special

  However, the construction method for laying an aerial cable on the flat part as described above cannot be employed in a place with a steep slope such as a mountainous part.

  This is because a 66 kV voltage class cross-linked polyethylene cable is for transmitting a large amount of power, and therefore the thickness of the insulator is about 1 cm, which is twice that of the 22 kV voltage class. Therefore, for example, when compared with a 22 kV voltage class cable having the same conductor size, the weight is about twice as heavy and the cable diameter is about 1.5 times thicker.

  Therefore, it is not easy to handle like a conventional 22 kV voltage class overhead cable.

  More specifically, when the aerial cable P is laid on the support Q at a steep slope such as a mountainous area, if the laying method in the flat portion described above is performed, the following adverse effects will occur.

  For example, as shown in FIGS. 12 and 13, the aerial cable P mounted on each moving roller 27 attached to the messenger wire MW slides down in an inclined direction, and as a result, the aerial cable P is bent. .

  When the cross-linked polyethylene cable is bent significantly, the thickness of the polyethylene covering the conductor in the cable fluctuates and the insulation performance deteriorates. ) Has been decided. The allowable bending radius is determined by a value proportional to the diameter of the cable. The larger the diameter, the larger the allowable bending radius and the weaker the bending.

  That is, as shown in FIGS. 12 and 13, the aerial cable P placed on each moving roller 27 slides in the inclined direction, and as a result, the allowable bending radius of the aerial cable P may be exceeded. .

  In particular, the aerial cable of the present invention is a cross-linked polyethylene cable of 66 kV voltage class, so it is heavier than the conventional 22 kV voltage class, and therefore easily slips. Furthermore, since the diameter is large, the allowable bending radius is large, and the value of the allowable bending radius can be easily divided.

  Further, for example, when an aerial cable P is laid on the support Q where there is a steep slope such as a mountainous area or where there is a steep bend in the horizontal direction, each moving roller attached to the messenger wire MW When 27 passes through the support Q, the support Q becomes in the way, and there arises a situation in which the support Q cannot actually be displaced.

  In addition, where there is a sharp bend in the horizontal direction, the pulling rope 22 is pulled more strongly inwardly in the bending direction of the curve, so the moving roller 27 is inclined when passing through the support Q, There is a possibility that the aerial cable P riding on the support roller 30 of the moving roller 27 may fall off.

  Therefore, the present invention was created in view of the existing circumstances as described above. For example, a 66 kV voltage class cross-linked polyethylene cable is installed as an aerial cable P in a mountainous area where there are many steep slopes and bends. Can be performed safely and reliably, and the wire drawing speed of the overhead cable P, that is, the installation work time of the overhead cable P per span of the support Q is easily reduced from 3 days to less than 1 day. An object of the present invention is to provide a method for laying an aerial cable P that can be performed.

An aerial cable laying method according to the present invention includes a step of attaching a jig body for replacing a suspended belt comprising a guide pulley on the upper side of a support installed on a steep slope, and a plurality of supports. The process of extending the messenger wire and attaching a plurality of suspension wheels to the messenger wire, and deploying the overhead cable along the messenger wire via the suspension vehicle and the towing rope connected to the suspension vehicle An aerial cable laying method comprising a process and a process of binding an aerial cable to a messenger wire using a lashing machine ,
The step of deploying the aerial cable along the messenger wire is performed by tying and fixing the aerial cable by a suspension belt provided below the suspension car and towing the suspension car along the messenger wire by towing the tow rope. Something to move,
The jig body is supported by a guide pulley on which a tow rope is placed and passed, and a support arm portion disposed in front of and behind a horizontal arm portion protruding horizontally from the bearing portion lower side of the guide pulley. It consists of a guide part that fixes a tubular member provided with a cut along the longitudinal direction, and the overhead cable is supported by the guide part when the suspension wheel is replaced on the upper side of the support. Settled.

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  In addition, the process of tying an aerial cable to a messenger wire using a lashing machine can be performed using a lashing machine with a scorpioner, with a scorpioner placed at the top of the lashing machine, and the above-mentioned problem Solved.

  In addition, when using a lashing machine with a hoist, the above-mentioned problem was solved by performing lashing while collecting the suspension wheel with the hoist.

  Moreover, the above-mentioned subject was similarly solved by resetting the lashing machine with a hoistor manually to the next diameter at the end of the lashing for every one diameter.

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  According to the present invention, for example, a 66 kV voltage class aerial cable P can be safely and reliably laid in a mountainous area or the like where there are many steep slopes and bends, and the extending speed of the aerial cable P can be increased. That is, the installation work time of the overhead cable P per span of the support Q can be easily reduced from 3 days to 1 day or less.

  Moreover, in the installation method of the aerial cable P according to the present invention, the predetermined suspension wheel 1 is used. When this suspension wheel 1 is used, the human power of the worker on the support Q is used. Therefore, it is necessary to replace the suspension wheel 1 between the next diameters.

  At this time, since the suspension interval of the suspension wheel 1 is restricted by the allowable surface pressure of the overhead cable P, the allowable bending radius, etc., the interval is several meters, and the weight of the cable applied to each suspension wheel 1 is It reaches several tens of kilograms.

  In order to remove and replace the suspension wheel 1 to which the load of several tens of kg is applied, it is necessary to temporarily suspend the overhead cable P, and the wire drawing work must be temporarily stopped. However, according to the present invention, this problem can be solved and continuous wire drawing work can be realized.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

The laying method of the aerial cable P according to the present invention is as shown in FIG. 2 in order to prevent the aerial cable P from falling off and to easily attach and detach the suspension car 1 to the messenger wire MW. It is what you use.

  As shown in FIGS. 7 (a) and 7 (b), the suspension wheel 1 includes a suspension belt 2 below, and wraps the suspension belt 2 around three overhead cables P so as to be suspended. Yes.

  Thus, when tied, when towing a steep slope as shown in FIGS. 12 and 13 with the tow rope 11, the three cross-linked polyethylene cables are not loosened by their own weight, and are towed safely and reliably. be able to.

  Then, as shown in FIGS. 2, 5 (a), (b), and FIG. 6, a jig body 3 for replacing the suspension belt 2 is installed above the support Q.

  The jig body 3 includes a guide portion 4 made of an Eflex tube that allows the aerial cable P to pass therethrough, and a guide pulley 5 that supports the guide portion 4 and allows the towing rope 11 to pass therethrough.

  Further, in this construction method, it is necessary to collect the suspension wheel 1 after the aerial cable P is extended. Therefore, a worker who connects the lashing machine LM and the hoist R and rides the hoist R Is adapted to collect the suspension wheel 1 manually according to the lashing.

  As shown in FIGS. 8 and 10, the air hoist R is formed in a substantially chair shape that allows an operator to sit sideways with respect to the traveling direction along the messenger wire MW. A pair of front and rear suspension pulleys are attached to the upper side of the air hoist R. Then, one end side of the suspension pulley is connected to the leading portion 6 of the lashing machine LM via a pulling member 7.

  As shown in FIGS. 9 and 11, a guide portion 4 made of an Eflex tube that allows the aerial cable P to pass therethrough may be disposed on the seat of the air hoist R.

As shown in FIGS. 10 and 11, the lashing machine LM includes a leading portion 6 that is attached to each of the messenger wire MW and the three overhead cables P, and moves along the same, and a pair of left and right rotating drums 8. The lashing machine main body 9 and a rain cover 10 that covers the upper side of the lashing machine main body 9 used during rainfall are generally constituted.

  The lashing machine body 9 is connected to one end side of the leading portion 6 and rotates around the leading portion 6 so as to turn around the messenger wire MW and the three overhead cables P. A pair of left and right rotating drums 8 around which lashing wires LW are wound are provided.

  By pulling the lashing machine LM in the direction of travel along the messenger wire MW, the messenger wire MW and each of the three overhead cables P can be lashed smoothly at a constant pitch. Is performed from the lower direction of the next support Q or the like, and therefore the traveling direction and the towing direction do not coincide with each other at a steep ascending slope.

  In this case, as shown in FIG. 4, the occupant R is placed on the messenger wire MW so that the occupant R comes to the head of the lashing machine LM, so that the occupant R and the worker who rides it The climbing gradient in the traveling direction of the lashing machine LM is relaxed by the total weight of the lashing machine LM so that a smooth lashing operation can be realized.

  As shown in FIGS. 7A and 7B, the suspension belt 2 is fixed to the suspension wheel 1 through the carabiner 1A so that each of the three overhead cables P is bundled and tied. Yes. This prevents the cable P from slipping off in a mountainous area with a steep slope and a lot of bending.

  Furthermore, the intermediate part of the suspension wheel 1 suspended from the messenger wire MW and the suspension belt 2 is connected by a tow rope 11 as shown in FIG. 2 arranged below the messenger wire MW.

  The jig body 3 is configured so that the aerial cable P is automatically temporarily suspended when the suspension wheel 1 is replaced.

  Specifically, as shown in FIGS. 5A and 5B and FIG. 6, the aerial cable P can be easily formed along the upper longitudinal direction of the guide portion 4 by a cylindrical flexible eflex tube. The cut 4A is provided so that it can be taken out.

  The guide portion 4 by the F-flex pipe is an arc shape arranged in three places before and after the horizontal arm portion 15 protruding in the horizontal direction from the lower side of the L-shaped bearing portion 14 in the guide pulley 5 on which the towing rope 11 is placed. It is being fixed in the state supported by the support arm part 12.

  Further, on the upper side of the bearing portion 14 of the guide pulley 5, a mounting portion 13 for lifting and fixing the jig body 3 on the support Q is provided.

  The jig body 3 configured in this way is fixed to the upper side of the support Q. At this time, further safety measures are taken through a sling belt (not shown) that is double protected.

  Next, an example of the installation method of the aerial cable P according to the present invention will be described.

  First, as shown in FIG. 1, a messenger wire MW is extended between the supports Q such as a plurality of iron pillars.

  On the upper side of the support Q, as shown in FIG. 2, the suspension belt 2, which includes a guide pulley 5 for supporting the guide portion 4 through which the overhead cable P can pass and for allowing the towing rope 11 to pass therethrough. A jig body 3 for replacement is attached in advance.

  Then, the worker goes up to the support Q, mounts the first suspension wheel 1 on the messenger wire MW, and at the same time hangs the three overhead cables P drawn from the three drums arranged on the ground. Tie to the suspension belt 2 of the gold wheel 1.

  Further, as shown in FIG. 2, a tow rope 11 disposed below the messenger wire MW is connected to an intermediate portion between the suspension wheel 1 and the suspension belt 2 suspended on the messenger wire MW.

  At this time, the tow rope 11 is placed on the guide pulley 5 of the jig main body 3 disposed on the upper side of the support Q, and by pulling the tow rope 11, the towing wheel 1 and the suspension belt 2 are pulled by towing. The middle part of the moves along the messenger wire MW.

  Then, the tow rope 11 is pulled along the messenger wire MW to move the first hanging wheel 1 by about 5 m, and then the second hanging wheel 1 is mounted on the messenger wire MW. At the same time, the three overhead cables P drawn from the three drums arranged on the ground are bound to the suspension belt 2 of the second suspension wheel 1.

  Next, the first hanging wheel 1 and the second hanging wheel 1 are connected by the tow rope 11 and the tow rope 11 is pulled to connect the both hanging wheels 1 along the messenger wire MW. Move about 5m.

In addition, in order to perform a series of operations on steep mountain slopes, the tow rope 11 needs a traction force corresponding to both the load of the tow rope 11 and the load of the cross-linked polyethylene cable on the up slope. On the down slope, conversely, a pulling force is required for both loads. However, since the load of the tow rope 11 and the load of the crosslinked polyethylene cable are known in advance, if the load is calculated in advance, Even a steep mountain slope can be handled with a small winch.

  When each suspension wheel 1 passes through the support Q, the aerial cable P is supported in a state of being placed on the guide portion 4 of the jig main body 3, so that it is added to each suspension wheel 1. The cable weight is extremely small.

  Moreover, if a lubricant is applied to the Eflex tube of the guide portion 4, the movement of the aerial cable P is improved, which contributes to the improvement of the laying efficiency.

  As shown in FIG. 2, in the portion supported by the guide portion 4, the suspension belt 2 itself suspended from the suspension wheel 1 is in a relaxed state, and the suspension belt via the support Q The replacement work of the car 1 can be easily performed.

  That is, as shown in FIG. 3, when a cross-linked polyethylene cable is used as the aerial cable P in a state where the guide part 4 of the jig body 3 is not installed on the support Q, it is added per one suspension wheel 1. Cable weight reaches several tens of kilograms.

  In order to remove and replace the suspension wheel 1 to which the load of several tens of kg is applied, it is necessary to temporarily suspend the overhead cable P, and the wire drawing work must be temporarily stopped. Although it had the problem of becoming worse, this problem was solved by installing the guide part 4 of the jig body 3 on the support Q, and further applying a lubricant to the guide part 4. Therefore, continuous wire drawing work can be realized.

  Thus, by repeatedly performing such an operation, each hanging wheel 1 is arranged at intervals of about 5 m along the messenger wire MW.

  Next, the lashing machine LM is installed in order to bind the three overhead cables P to the messenger wire MW using the lashing wire LW.

  Then, the hoistor R is put on the messenger wire MW so that the hoistor R comes to the head of the lashing machine LM. At this time, the lashing machine LM and the hoist R are connected via the pulling member 7.

  Thereafter, the lashing machine LM is moved to perform lashing. The lashing machine LM is moved by pulling a pulling rope H attached to the lashing machine LM by hand by an operator on the ground or by a winch as shown in FIG.

  At this time, as shown in FIG. 4, the worker riding on the air hoist R performs lashing while removing the suspension belt 2 of the suspension wheel 1. In addition, the worker collects the suspension wheel 1 sequentially.

  At the time of lashing, the lashing machine LM moves along each of the messenger wire MW and the three aerial cables P, and the lashing wire LW is pulled out from the rotating rotating drum 8, and the messenger wire MW and the three aerial cables A lashing wire LW is wound around each P so as to form a double spiral with a pitch interval of 20 cm or less.

  When the lashing for each diameter is completed, the lashing machine LM is set again to the next diameter by the manual operation by the worker.

  The present invention relates to an aerial cable P for laying while lashing an ultra-heavy aerial cable P composed of a plurality of cross-linked polyethylene cables with respect to a messenger wire MW erected between support parts such as a plurality of iron pillars. As a laying method, it is widely used in various fields.

It is a side view which shows the state which installed the messenger wire between the supports. It is a side view which shows the state which installs an aerial cable between spans with a hanging wheel in the state which attached the jig | tool main body to the support body. It is a side view which shows the state which installs an aerial cable between spans with a hanging wheel in the state in which a jig | tool main body does not exist in a support body. It is a side view which shows the state which is performing the lashing operation | work with an air hoist. An example of a jig | tool main body is shown, (a) is a front perspective view of the guide pulley which shows the state which removed the guide part, (b) is an exploded perspective view of the guide pulley which shows the state which attaches a guide part. It is a perspective view which shows the whole structure of a jig | tool main body. An example of a suspension wheel is shown, (a) is a front view of a state where an aerial cable is attached to a suspension belt, and (b) is a perspective view of a state where an aerial cable is attached to a suspension belt. It is a side view which shows an example of the use condition of a hoist. It is a side view which shows the other use condition of a hoist. It is a side view which shows the state which connected the air hoist and the lashing machine. It is a side view which shows the state which connected the air hoist and the lashing machine and is using the guide part. It is the side view explaining the laying state of the aerial cable in a steep mountain part. It is the side view explaining the installation state of the aerial cable in a steep mountain part. It is the side view explaining the installation method of the aerial cable in a prior art example. It is a perspective view which shows the use condition of a guide roller. It is a perspective view which shows the passage state of the movement roller in the vicinity of a support body. It is a perspective view which shows the use condition of a lashing machine. It is a perspective view which shows the example of arrangement | positioning of the curve roller in the vicinity of a support body. It is a perspective view which shows the example of arrangement | positioning of the other curve roller in the vicinity of a support body.

P ... Aerial cable Q ... Supported object R ... Suspension MW ... Messenger wire LM ... Lashing machine LW ... Lashing wire H ... Pulling rope 1 ... Suspension wheel 1A ... Carabiner 2 ... Suspension belt 3 ... Jig body 4 ... Guide Part 4A ... Cut 5 ... Guide pulley 6 ... Leading part 7 ... Traction member 8 ... Rotating drum 9 ... Lashing machine body 10 ... Rain cover 11 ... Towing rope 12 ... Support arm 13 ... Mounting part 14 ... Bearing part 15 ... Horizontal Arm part

Claims (4)

A step of attaching a jig body for replacing a suspension belt comprising a guide pulley on the upper side of a support installed on a steep slope, a step of extending a messenger wire between a plurality of supports, Attach multiple suspension wheels to the messenger wire, deploy the aerial cable along the messenger wire via the suspension vehicle and the towing rope connected to the suspension vehicle, and use a lashing machine to messenger A method of tying an aerial cable to a wire, and an aerial cable laying method comprising:
The step of deploying the aerial cable along the messenger wire is performed by tying and fixing the aerial cable by a suspension belt provided below the suspension car and towing the suspension car along the messenger wire by towing the tow rope. Something to move,
The jig body is supported by a guide pulley on which a tow rope is put and passed, and a support arm portion arranged in front of and behind a horizontal arm portion protruding in a horizontal direction from the bearing portion lower side of the guide pulley, An aerial cable comprising a guide portion to which a tubular member having a cut along the longitudinal direction is fixed, and the aerial cable is supported by the guide portion when the suspension wheel is replaced on the upper side of the support. Laying method. Use lashing machine, step tie the aerial cable to the messenger wire is placed in the air-ride device to the top of the lashing machine, the aerial cable according to claim 1 carried out using a lashing machine with perched multiply unit Laying method. The method for laying an aerial cable according to claim 2 , wherein, when a lashing machine with a hoistor is used, lashing is performed while collecting the suspension wheel with the hoistor. The laying method for an aerial cable according to claim 2 or 3 , wherein a lashing machine with a hoist is manually set to the next diameter at the end of the lashing for each diameter.

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