JP6544575B2 - Tensile clamp - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a tension-resistant clamp used when disposing an overhead transmission line in a tension-resistant steel tower by a stringing method.

  Conventionally, in the stringing method, the cam along is attached to the power transmission line and temporarily tightened, and then the electric wire near the tower is lifted from the cam along mounting position, marking the position up to the conductor side yoke of the ladder device to this electric wire Then, there is a method of attaching a wedge-shaped retention clamp at an appropriate position with reference to the marking position and connecting the wedge-shaped retention clamp and the conductor side yoke.

  Also, when erecting the power transmission line, mark the position of the wire where the fixed position of the hooked holding clamp applies a predetermined tension to the wire, and attach the hooked holding clamp at this marking position, There has been proposed a stringing method for overhead transmission lines in which the work for attaching the cam-along and the related work are omitted (Patent Document 1). In this stringing method, in order to attach the hook-shaped retention clamp to the power transmission line, the operator moves to the retention clamp mounting position in a suspended manner on the electric wire, temporarily removes the hook and the clamp from the brought-in hook retention clamp. After temporarily attaching the clamp body to the power transmission line with the nut and the nut, the clamp body and the transmission line are fixed by using a weir mechanism consisting of a weir and a clamp and moving the clamp body. This securing operation requires a hydraulic tool to push the wire into the groove of the clamp body with a scissors. The hydraulic tool is heavy and cumbersome to handle. Therefore, the method of Patent Document 1 has a problem that labor is required when the operator carries and transports the hydraulic tool to a work place in a high place. Moreover, since it may be necessary to operate the hydraulic tool in a state of being suspended on the power transmission line at the time of fixing work, there is a problem that the burden on the operator is large.

  Patent Document 2 describes a tension-resistant clamp that can facilitate a tightening operation. This tension-resistant clamp has a structure in which a pair of rod-like attachment arms are rotatably attached to both sides of the wire guide groove of the clamp main body, with one attachment arm projecting more than the other, and the longer one It is characterized in that the mounting arm portion and the connection fitting on the forceps side are connected by a connector such as a taper bolt having a taper portion in the middle. In addition, on the jumper side of the wire guide groove, a clamp portion including a clamp and a tightening bolt with a nut is provided.

  According to this tension-resistant clamp, in a state in which the forceps side connection fitting and the longer attachment arm are temporarily fixed by the connector such as the taper bolt, the shorter attachment arm is rotated to make the transmission line into the guide groove. After the introduction, the shorter mounting arm is returned to the position where the original power transmission line is pinched, and the long mounting arm is connected with the connection fitting with a bolt, a nut or the like. Further, the power transmission line can be fixed to the clamp main body by the clamp portion consisting of the press fitting and the tightening bolt. Therefore, the tension clamp of Patent Document 2 does not require the use of a heavy tool such as a hydraulic tool and complicated handling as compared with the wedge-shaped retention clamp, and the electric wire and the electric wire can be easily done with only one torque wrench. Since the fixing operation with the clamp body can be performed, there is an advantage that the operation labor can be reduced.

  Patent Document 3 describes an overhead transmission wire stringing method that can easily carry out an overhead transmission wire stringing operation, a multiple conductor tensile insulator device used therefor, and a bolt-type tensile clamp. In this stringing method, the tension-resistant clamp is fixed at the clamp mounting position of the transmission line on the jumper side, and the conductor-side yoke and tension resistance of the multiple conductor tension insulator device suspended on the support arm of the transmission tower The tensioning clamp is connected with the jumper end of the tension clamp with a tensioning metal car, and by shortening this metal car, the multi-conductor tension resistance device and the power transmission line are raised, and then the multi-conductor resistance is used in the tension resistance clamp. It is what connects clamp connection metal fittings of a tension ladder device.

Japanese Patent Publication No. 57-58842 Japanese Utility Model Publication No. 52-29275 JP-A-9-182230

  In the tension-resistant clamp described in Patent Document 2, in a state where it is temporarily connected to the connection fitting of the forceps device with a taper bolt or the like, the shorter attachment arm of the pair of attachment arms is opened to allow wire introduction. After the wire is introduced into the guide groove, it is necessary to return the shorter mounting arm to the sandwiching position for sandwiching the wire and to perform connection with the connection fitting. That is, the bolt and nut must be attached and detached before and after the introduction of the transmission line. Since the work of introducing the transmission line into the tension clamp is performed at a high place, there is a demand for reducing the burden as much as possible, and it is desired to reduce the work of attaching and detaching the bolt and nut.

  Moreover, a steel plate with high strength is used for a pair of attachment arm parts provided in a clamp main body on strength design. The steel plate has a larger specific gravity than the aluminum alloy which is a material of the clamp main body, and thus is a factor of increasing the weight of the tension-resistant clamp. In addition, a bolt and a nut are required to attach the pair of mounting arms to the clamp body, and a taper bolt is used to temporarily connect the mounting arms and the ladder device. Is also a cause of cost increase.

  SUMMARY OF THE INVENTION In view of the above-described conventional problems, an object of the present invention is to provide a tension clamp that can facilitate the installation work of transmission lines and reduce the burden of stringing work, and can reduce the weight and cost. is there.

The present invention according to claim 1 invented to achieve the above object is:
A tension-resistant clamp for disposing an electric wire in a tension-resistant steel tower,
A main body having a guide groove for guiding an electric wire formed at the upper edge, and a clamp portion for fixing the electric wire provided subsequently to the guide groove;
The main body portion has a guide wall standing along one side edge of the guide groove;
The guide wall includes a stringing link for attaching a stringing wire provided at one end side, a forceps connection portion for connecting with a forceps device provided at the other end side, and a surface facing the guide groove Is a tension-resistant clamp characterized in that it has a rib formed on the opposite side from the upper surface toward the guide groove.

  In the tension-resistant clamp according to the second aspect of the present invention, the guide wall further includes an overhang portion formed on the upper surface in a direction opposite to the direction facing the guide groove, and the stringing A link is formed on the overhanging portion.

  In the tension clamp of the present invention according to claim 3, the forceps connection portion has a slit into which the plate-like connection portion of the forceps device is inserted, and the inner surface of the slit at a distance from the stringing link An inclined surface is formed to expand the slit width toward the opening.

  The tension-resistant clamp of the present invention according to claim 4 is characterized in that the main body portion is made of an aluminum alloy.

  According to the tension-resistant clamp according to the present invention, since the guide wall is erected along one side edge of the guide groove provided in the main body, the power transmission line is introduced into the guide groove along the guide wall. be able to. Therefore, since a conventional wedge mechanism and a mounting arm made of a steel plate are unnecessary, the weight of the main body can be reduced, and the number of parts can be reduced, so that the cost can be reduced. In addition, since it has a cantilever structure with a guide wall, it is not necessary to press the rod with a conventional hydraulic tool, or to remove the bolt and nut and introduce an electric wire between a pair of mounting arms. Since the line work is simplified, the workability can be improved and the burden on the operator can be greatly reduced.

  A tensile load is concentrated on the guide wall due to tension between the wire for tensioning and the forceps device, but a rib is formed from the upper surface toward the guide groove on the surface opposite to the surface facing the guide groove Therefore, even if it is made of a lightweight aluminum alloy etc., it can have necessary and sufficient strength.

  Further, according to the tension-resistant clamp according to the present invention, the upper surface of the guide wall further includes an overhang formed in the direction opposite to the direction facing the guide groove, so that the strength of the guide wall is further improved. It can be done. Furthermore, when a stringing link is formed at the overhanging part, the stretching direction of the power transmission line introduced into the guide groove and the stringing direction of the stringing wire connected to the stringing link can be arranged side by side. Thus, the interference between the metal car and the power transmission line attached to the stringing wire can be avoided, and the shortening work by the wire carrousing of the metal car can be easily performed.

  In addition, when the tension-resistant clamp according to the present invention is pulled between the forceps device and the stringing wire, the main body portion is inclined with respect to the stretching direction. In the present invention, since the inclined surface for expanding the slit width toward the opening is formed on the inner surface far from the stringing link in the slit of the insulator connection, the main body is in the above-mentioned inclined posture. The plate-like connection portion of the forceps device inserted into the slit is in surface contact with the inclined surface, and a stable connection can be established.

  Further, when the main body portion of the tension resistant clamp according to the present invention is made of an aluminum alloy, weight reduction and cost reduction can be achieved.

It is related with one Embodiment of the tension | tensile_strength clamp which concerns on this invention, Comprising: A figure (A) is a front view, A figure (B) is a rear view. The figure (A) is a top view and the figure (B) is a bottom view which concerns on one Embodiment of the tension | tensile_strength clamp which concerns on this invention. The figure which concerns on one Embodiment of the tension | tensile_strength clamp which concerns on this invention, Comprising: A figure (A) is a left view, A figure (B) is a right view. FIG. 1 (A) is a cross-sectional view taken along the line A-A of FIG. 1 (A), and FIG. 1 (B) is taken along the line B-B according to an embodiment of the tension clamp according to the present invention. It is sectional drawing in a line. FIG. 1 (A) is a cross-sectional view taken along the line C-C in FIG. 1 (A), and FIG. 1 (B) is a line D-D in FIG. 1 (A). It is sectional drawing in a line. The figure (A) is a top view and the figure (B) is a front view for demonstrating the stringing operation | work using the tension | tensile_strength clamp which concerns on this invention. The figure (A) is a top view, and the figure (B) is a front view for demonstrating the stringing operation | work which used the conventional tension-resistant clamp.

  Embodiments of the present invention will be described with reference to the drawings. In the tension clamp T according to the present invention, the main body 1 is made of an aluminum alloy (for example, AC7AF). The main body portion 1 has a guide groove 1a for guiding the electric wire at the upper edge portion, and a clamp portion 10 for fixing the electric wire is provided in a region from the middle of the guide groove 1a to the end portion 1t. Further, a guide wall 2 is formed in an area between the start end 1s of the guide groove 1a in the main body 1 and the clamp 10 along the side edge of the guide groove 1a. The guide groove 1a is gently curved halfway from the start end 1s, and thereafter, it is formed linearly to the end 1t.

In the guide wall 2, a stringing link 3 for attaching a stringing wire is provided on one end side of the upper surface portion, and a forceps connecting portion 4 for connecting to a forceps device 60 (see FIG. 6) is provided on the other end side. Be In the present embodiment, the upper surface 2 a of the guide wall 2 is provided with the overhang portion 5 formed to project in the direction opposite to the direction facing the guide groove 1 a, and one end side of the overhang portion 5 Line link 3 is formed.

Furthermore, the guide wall 2 has a rib 20 formed from the upper surface 2a toward the guide groove 1a on the surface 2c opposite to the surface 2b facing the guide groove 1a. In the present embodiment, two ribs are arranged to be substantially orthogonal to the bottom surface of the guide groove 1a, but the number, the angle, and the like of the ribs 20 can be changed as appropriate.

  At the other end of the guiding wall 2 a forceps connection 4 is provided. In the present embodiment, the forceps connection portion 4 has a slit 4a into which the plate-like connection portion 61 of the forceps device 60 (see FIG. 6) is inserted, and the inner surface of the slit 4a at a distance from the stringing link 3 An inclined surface 4b is formed to expand the slit width toward the opening. In addition, 4c is a bolt and a nut for connecting the connection part 61 in the slit 4a.

  As shown in FIG. 5, the clamp unit 10 includes a pressing unit 12 rotatably attached to the main unit 1 by a pin 12p, a bolt 13 rotatably attached to the main unit 1 by a pin 13p, and a bolt And 13 and a nut 14 to be screwed together. In the present embodiment, the clamp portions 10 having different directions are alternately disposed on both sides of the guide groove 1a. In the present embodiment, the number of sets of bolts 13 and nuts 14 used is four, which is one set smaller than five in the conventional product. This is based on the finding that the grip performance of the electric wire E can be secured by setting the tightening torque of the bolt 13 to 140 N · m, which is 10 N · m higher than the conventional (130 N · m). As a result of reducing the bolt 13 and the nut 14 by one set, the tension-resistant clamp T of this embodiment can reduce the weight, reduce the cost, and improve the workability by reducing the number of bolt tightening operations.

The pressing portion 12 has a recess 12 a into which the shaft portion 13 a of the bolt 13 can be inserted. When the electric wire E is fixed to the main body portion 1, the holding portion 12 and the bolt 13 are rotated to the outside of the main body portion 1 to open the guide groove 1a. In this state, after introducing the electric wire E into the guide groove 1a, the holding portion 12 is rotated to a position covering the electric wire E, and then the bolt 13 is rotated to be inserted into the recess 12a of the holding portion 12. Then, a nut 14 screwed to the bolt 13 in advance is tightened to press the pressing portion 12 against the electric wire E, thereby completing the fixing of the electric wire E.

In the present embodiment, since the work of fixing the electric wire E by the clamp portion 10 can be performed without separating the nut 14 from the bolt 13, the workability is very good. In addition, since the nut 14 is not separated, there is no fear that the nut 14 will be dropped or lost.

  Next, a method for securing an overhead transmission line using the tension-resistant clamp T according to the present invention will be described. As shown in FIG. 6, a stringing metal wheel 40 consisting of a pair of pulleys is connected to a cam along 30 attached at a predetermined position of the electric wire E, and this and the tension-resistant clamp T are connected with the string wire 50. The tension clamp T is connected to a ladder device 60 attached to a support arm (not shown) of the transmission tower or the like. Then, by winding up the wire 41 wound around the metal wheel 40 using a winch or the like, the procedure for shortening the metal wheel 40 and raising the electric wire E is the same as in the prior art.

  The tension-resistant clamp T according to the present invention can introduce the electric wire E into the guide groove 1a along the guide wall 2 provided in the main body 1 when performing the fixing operation of the electric wire E, so Workability is significantly improved. Then, the wire E can be easily fixed to the tension-resistant clamp T by introducing the wire E into the guide groove 1a along the guide wall 2 and tightening the nut 14 of the clamp portion 10.

  On the other hand, in the conventional stringing operation, as shown in FIG. 7, it is necessary to insert the electric wire E between the pair of mounting arms 101 and 102 provided on the tension-proof clamp t. It is necessary to attach and detach. That is, the bolt and nut are removed, the shorter mounting arm 101 is pivoted to the open position, and after introducing the electric wire E, the mounting arm 101 is pivoted again to the clamping position sandwiching the electric wire E. It is necessary to install and tighten the nut.

Thus, in order to introduce the electric wire E, it is necessary for the conventional tension-resistant clamp t to attach and detach the bolt and nut in the temporary connection state with the forceps device 60 and to open and close the mounting arms 101 and 102. On the other hand, since the tension-resistant clamp T of this embodiment can introduce the electric wire E into the guide groove 1a along the guide wall 2 and can hold the electric wire E in the cantilever state by the guide wall 2, the main body 1 Since the wire E can be introduced while the part 1 is connected to the forceps device 60, the workability is remarkably improved, and the problems of the dropout and the loss of the bolt and the nut are solved. In addition, the tension-resistant clamp T of the present embodiment can be reduced in weight as compared with the conventional tension-resistant clamp t having the attachment arms 101 and 102. For example, in the tension clamp for overhead power transmission line ACSR 810 mm ² , the weight reduction of about 5 kg can be achieved in this embodiment (about 16 kg) as compared with the conventional product (about 21 kg).

  In the tension-resistant clamp T of the present embodiment, a metal wheel 40 for stringing and a forceps device 60 are connected to the guide wall 2 and receive a large tensile load between them. Further, after completion of the stringing operation, the guide wall 2 receives a deformation force from the electric wire E held in tension in the guide groove 1a in a cantilever state. Therefore, ribs are formed on one surface 2c of the guide wall 2 to secure strength against tensile load and deformation force. As described above, the tension-resistant clamp T according to the present invention is a creative design for reinforcing design that can withstand a large tensile load when changing from the conventional double-supported structure to a single-ended structure, and as a result, the main body The part 1 is made of an aluminum alloy to reduce the weight as compared with the conventional product, and a rib can be provided to ensure the same tensile strength as that of the conventional tension-resistant clamp.

Further, in the tension-resistant clamp T of the present embodiment, since the stringing link 3 is provided on the upper surface 2a of the guide wall 2, the stringing wire 50 connected thereto and the electric wire E at the time of being introduced into the guiding groove 1a Since it is arranged side by side, the winding operation of the wire 41 of the metal wheel 40 is not disturbed. Moreover, since the stringing link conventionally provided at two places is one place in this embodiment, cost reduction and weight reduction can be achieved.

Furthermore, in the tension-resistant clamp T of the present embodiment, since the position of the stringing link 3 is on the side of the guide groove 1a, as shown in FIG. 6A, between the metal wheel 40 and the forceps device 60. When the main body portion 1 is pulled in the direction S1, the main body portion 1 is slightly inclined with respect to the pulling direction. Therefore, in the present embodiment, the inclined surface 4b is formed on one inner surface of the slit 4a of the forceps connection portion 4, and the plate-like connection portion 61 of the forceps device 60 faces the inner surface of the slit 4a when the main body 1 is inclined. It was configured to touch. According to this configuration, the connection portion 61 of the forceps device 60 can eliminate the problem of being distorted in the slit 4a, and a stable connection state can be obtained.

T Tension-proof clamp 1 body 1a guide groove 2 guide wall 3 wire connection link 4 ladder mounting portion 5 overhang portion 10 clamp portion 20 rib E electric wire

Claims (4)

A tension-resistant clamp for disposing an electric wire in a tension-resistant steel tower,
A main body having a guide groove for guiding an electric wire formed at the upper edge, and a clamp portion for fixing the electric wire provided subsequently to the guide groove;
The main body portion has a guide wall standing along one side edge of the guide groove;
The guide wall includes a stringing link for attaching a stringing wire provided at one end side, a forceps connection portion for connecting with a forceps device provided at the other end side, and a surface facing the guide groove And a rib formed on the opposite side surface from the upper surface toward the guide groove. The guide wall further includes an overhang portion formed on the upper surface in a direction opposite to a direction facing the guide groove,
The tension clamp according to claim 1, wherein the stringing link is formed in the overhanging portion. The forceps connection portion has a slit into which the plate-like connection portion of the forceps device is inserted, and on the inner surface of the slit far from the stringing link, an inclined surface for expanding the slit width toward the opening portion A tensioning clamp according to claim 1 or 2 which is formed.   The tension resistant clamp according to any one of claims 1 to 3, wherein the main body is made of an aluminum alloy.

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