JP6034434B2 - Snow accretion prevention device and installation method of snow accretion prevention device - Google Patents

Description

  The present invention relates to a snow accretion prevention apparatus for preventing snow on a brace constituting an overhead power transmission line tower, and a method for attaching the apparatus.

  When snow accumulates on a member of an overhead power transmission line tower, a load higher than the design is applied to the tower member due to the weight of the snow, and the member may be deformed, for example. In particular, the brace part projecting from the pillar of the steel tower is a structure in which members are combined, and since it has many horizontal surfaces and gentle slopes, it is the most prone to snow due to the structure of the steel tower. For this reason, when snow covered with snow on the arm metal part becomes a large lump and falls, the vinyl house under the line may be damaged or the house may be damaged. Moreover, when the tip of the armature part of the steel tower is covered with snow, the snow continues to accumulate downward along the insulator surface, and finally the snow is connected to the vicinity of the power line. In such a state, since the snow is conductive, the voltage applied to the power line is transmitted through the snow and causes a ground fault with the steel tower.

  For this reason, the manager of the overhead power transmission line tower climbs the tower to the tower during snowfall, and uses, for example, an insulating rod to drop the snow covered on the tower arm. Since the steel tower is built every few hundred meters and is not built only on a flat position, snow removal work requires considerable labor costs. In addition, in the snow melting method, which is another measure for preventing snow accretion, only the surface of the member is melted, so that the snow can be hollowed out and it is difficult to obtain a sufficient snow melting effect.

  As yet another snowfall countermeasure, for example, Patent Document 1 describes a steel tower crown snow prevention device in which, when a certain amount of snow has accumulated on a snowfall plate, the snowfall plate opens to cause snow to fall. . Patent Document 2 describes a snowfall prevention device that prevents snowfall by entangling snow in a mesh of a net-like cover. Furthermore, Patent Document 3 describes a structure for preventing icing and snowing in which a synthetic resin foam molded body is fitted so as to fill an inner space portion of an angle steel constituting a metal arm of a steel tower.

Japanese Utility Model Publication No. 2-121550 JP 2001-333523 A JP 2002-276197 A

  However, the steel tower crown snow prevention device described in Patent Document 1 snows at the same time as the snow falling plate opens, so there is a possibility of damage to the vinyl house directly under the steel tower or damage to the house. If it is frozen as a lump, it may be difficult to fall snow even if the snowfall plate opens.

  Moreover, in the snow fall prevention apparatus described in the said patent document 2, since snow is entangled in a mesh, there exists a possibility that a power transmission line may be ground-faulted along with the insulator surface, and snow keeps piled down.

  Furthermore, in the said patent document 3, since a arm metal part becomes an inclined surface with a synthetic resin foaming molding, there exists a problem that a scaffold is bad for the operator who works with the arm metal of an overhead power transmission line tower, and workability | operativity worsens. is there.

  The object of the present invention has been made in view of the above-described problems, and can reliably prevent snow from reaching the end of the armrest during snowfall without impairing the workability of working with an overhead power transmission line tower. An object of the present invention is to provide a snow accretion prevention device and a method for installing the snow accretion prevention device.

A snow accretion prevention device according to the present invention includes a support column erected on the ground, an arm metal main member projecting horizontally from the support column, and an arm metal part having an arm metal suspension material for supporting the arm metal main member. A fixing member that is fixed only to a tip portion of the armrest suspension member of the overhead power transmission line tower, and a cover member that is detachably attached to the fixing member, and the fixing member grips the armrest suspension member A clamping part that sandwiches the armrest suspension material by a claw part to be engaged, one end fastened to the clamping part via a first fastening part, and the other end fastened to the cover member via a second fastening part It consists an angle to said cover member, extends in a state of being attached to the fixed member, to the outside from the front end portion of the cross-arm portion so as to cover the upper end portion of the cross-arm portions Thus, it is possible to prevent snow at the tip of the arm metal part .
Moreover, the snow accretion prevention apparatus which concerns on the preferable aspect of this invention is characterized by the said cover member being formed with the board | plate material, and this board | plate material being flat form.

  According to the present invention, since the cover member can be attached to and detached from the fixing member, the cover member can be easily detached from the arm metal part, for example, during maintenance work, and the workability of working at the arm metal tip part can be impaired. There is no advantage. Furthermore, according to the present invention, when the cover member is attached to the fixing member, it is possible to prevent snow on the arm metal tip by covering the top of the arm metal tip. That is, according to the present invention, for example, it is possible to reliably prevent snow from reaching the tip of the armrest during snowfall without impairing the workability of the overhead power transmission line tower during maintenance or management work.

  The snow accretion prevention device according to a preferred aspect of the present invention is characterized in that a water repellent layer made of a water repellent material is formed on the surface of the cover member. According to this aspect, since the surface of the cover member has a water-repellent function, the snow on the surface of the cover member does not accumulate, and the snow on the surface of the cover member slides down to the lower part of the steel tower, so that the arm can be surely secured. Snow on the gold tip can be prevented.

  In the snow accretion prevention device according to a preferred aspect of the present invention, the fixing member has a variable mechanism capable of changing an inclination angle of the cover member. According to this aspect, by making it possible to change the inclination angle of the cover member, the snow on the surface of the cover member can be slid down to the lower part of the tower before the snow that has snowed on the cover member accumulates.

  The snow accretion prevention device according to a preferred aspect of the present invention further includes a swing mechanism capable of swinging the cover member with a connection portion with the fixing member as a fulcrum. According to this aspect, by making the cover member swingable, snow accumulated on the cover member can be forcibly shaken off by swinging of the cover member.

Moreover, the snow accretion prevention device according to the present invention comprises a fixing member fixed to the armrest tip of the armature that constitutes the overhead power transmission line tower, and a cover member that is detachably attached to the fixing member. The cover member is formed of a plate material, the plate material has a mountain shape or a dome shape, and covers the upper portion of the arm metal tip when attached to the fixing member, so that the arm metal tip It is characterized by preventing snow on the part.
And this invention can be grasped | ascertained not only as the said aspect but as the attachment construction method of the snow accretion prevention apparatus which concerns on the said aspect.

  ADVANTAGE OF THE INVENTION According to this invention, the installation work of the snow accretion prevention apparatus and snow accretion prevention apparatus which can prevent reliably that it snows on a front-end | tip part of an arm bracket, without impairing the workability | operativity which works with an overhead power transmission line tower. A method can be provided.

It is a figure which shows the overhead power transmission line tower to which the snow accretion prevention apparatus to which this invention was applied is attached. It is a figure which shows the front-end | tip part of the arm bracket part of an overhead power transmission line tower. It is a figure which shows the structure of the snow accretion prevention apparatus to which this invention was applied. It is a figure for demonstrating the specific structure of the fixing member which fixes a cover member. It is a figure for demonstrating the specific structure of a cover member. It is a figure for demonstrating the modification of a cover member. It is a figure for demonstrating the structure of the snow accretion prevention apparatus which concerns on a 1st modification. In the snow accretion prevention apparatus which concerns on a 1st modification, it is a figure for demonstrating the structure of the cover member concerning another form. It is a figure for demonstrating the structure of the snow accretion prevention apparatus which concerns on a 2nd modification.

  A mode for carrying out the present invention (hereinafter referred to as the present embodiment) will be described with a specific example. The present embodiment relates to a snow accretion prevention device for preventing snow on a brace constituting an overhead power transmission line tower, and a method for attaching the snow accretion prevention device.

  Prior to specific description of the snow accretion prevention device to which the present invention is applied, an overhead power transmission line tower to which the snow accretion prevention device is attached will be described.

  As shown in FIG. 1A, the overhead power transmission line tower 1 is composed of a support column 2 standing on the ground G and a plurality of armrests 3a, 3b, 3c, 3d protruding in a horizontal direction from the support column 2. It consists of and. In FIG. 1A, the brace portions 3a, 3b, 3c, and 3d are provided in order from the ground G in the vertical direction, but the number of the brace portions may be arbitrary.

  Power transmission lines are laid on the arm metal parts 3 a, 3 b, 3 c (hereinafter collectively referred to as the arm metal part 3) via a lever 4 provided on the tip part 30. Specifically, the arm metal portions 3 a, 3 b, and 3 c are respectively composed of an arm metal main material 31 arranged in the horizontal direction and an arm metal suspension material 32 that supports the arm metal main material 31. In addition, at the distal end portion 30 of the armrest portion 3, an insulator 4 is attached to the armrest main material 31, and a power transmission line is laid through the insulator 4.

  As shown in FIG. 1 (B), the overhead power transmission line tower 1 having the above-described configuration causes snow S to accumulate on the brace part 3 and the support column 2 during snowfall. In particular, the brace part 3 is a structure in which the bracelet main material 31 and the bracelet suspension material 32 are combined, and since there are many horizontal surfaces and gentle slopes, as is apparent from FIG. It is the most prone to snow.

  Here, FIG. 2A is a top view in which the distal end portion 30 of the armrest portion 3 is enlarged from the top to the bottom of the overhead power transmission line tower 1, and FIG. FIG. 2C is an enlarged view of the distal end portion 30 of the armrest portion 3 from the distal end portion 30 of the armrest portion 3 toward the support column 2 side.

As shown in FIGS. 2 (A) to 2 (C), the arm metal main material 31 (31a) and the arm metal main material 31 (31b) are arranged so as to be combined on the distal end portion 30 side. Similarly, the bracelet suspension material 32 (32a) and the bracelet suspension member 32 (32b) are arranged so as to be combined on the distal end portion 30 side. Moreover, since the arm metal main material 31 and the arm metal suspension material 32 are each fixed to the joining member 33 by bolting at the distal end portion 30, a gap D shown in FIG. 2 is formed. Since such a gap D snow S is easily clogged during snowfall, the tip portion 30 is easily snowcapped. In addition, when the surface of the arm metal main member 31 and the arm metal suspension member 32 snows at the tip portion 30, the snow continues to accumulate downward along the insulator 4 surface. And finally, there is a possibility that the snow S is connected to the vicinity of the power line 5 connected to the lower part of the insulator 4. In such a state, since the snow S is conductive, the voltage applied to the power line 5 is transmitted through the snow S, and as shown in FIG. 2B, a ground fault occurs from the overhead power transmission line tower 1 to the ground G. become.

  Therefore, in order to surely prevent the snow from landing on the distal end portion 30 of the armrest portion 3 described above, as shown in FIG. 3, the snow accretion prevention device 100 according to the present embodiment has the following configuration. .

  FIG. 3A is a top view showing the snow accretion prevention device 100 attached to the armrest suspension 32, FIG. 3B is a side view showing the snow accretion prevention device 100, and FIG. It is the figure which expanded and looked at the snow accretion prevention apparatus 100 which made the viewpoint 2 side from the front-end | tip part 30 a viewpoint. As shown in FIGS. 3A to 3C, the snow accretion prevention device 100 includes a fixing member 110 and a cover member 120.

The fixing member 110 is a member fixed to the distal end portion 30 of the arm metal 3, specifically, a member fixed to the arm metal suspension member 32. For example, when the brace suspension member 32 is angle steel, the fixing member 110 has a configuration as shown in FIG. Here, FIG. 4A is a view showing the fixing member 110 from the cross-sectional direction of the armband suspension member 32 as a viewpoint, and FIG. 4B is fixed from the longitudinal direction of the armband suspension member 32 as a viewpoint. It is the figure which showed the member 110. FIG. As shown in FIG. 4A and FIG. 4B, the fixing member 110 has a total of 2 including a sandwiching portion 111 for sandwiching the armband suspension material 32, an L-shaped angle 112, a bolt and a nut. It consists of a set of fastening portions 113a and 113b. The sandwiching portion 111 fixes the fixing member 110 to the arm metal suspension member 32 by holding the arm metal suspension member 32 with a pair of claw portions 111a and 111b. One end of the L-shaped angle 112 is fastened to the sandwiching part 111 via the fastening part 113a , and the other end is fastened to the cover member 120 so as to be detachable via the fastening part 113b.

The cover member 120 is a member that is detachably attached to the fixing member 110 described above, and specifically has a configuration as shown in FIG. Here, FIG. 5A is a side view of the cover member 120, and FIG. 5B is a back view of the cover member 120. As shown in FIGS. 5A and 5B, the cover member 120 has a total of four attachment portions 122a, 122b, 122c, 122d (collectively referred to as attachment portions 122) that can be attached to and detached from the fixing member 110. Consists of. Specifically, the attachment portions 122a and 122b are attached to the distal end portion 30 side of the armband suspension members 32a and 32b via the fixing member 110, respectively. Moreover, the attachment parts 122c and 122d are attached to the support 2 side of the armband suspension members 32a and 32b via the fixing member 110, respectively. Further, each attachment portion 122 is formed with a hole 1221 for fastening with the fastening portion 113b of the fixing member 110 described above.

  As shown in FIG. 5B, the cover member 120 has a water repellent layer 121 made of a water repellent material formed on the surface thereof. Specifically, the water repellent layer 121 is formed, for example, by applying a water repellent paint, performing a water repellent surface treatment, or attaching a water repellent tape.

  As the water-repellent paint, an epoxy or urethane paint can be primed on the surface of the cover member and then applied with a paint containing polymer powder. For example, a super water-repellent paint HIREC manufactured by NTT Advanced Technology Corporation can be used. The water repellent surface treatment is, for example, a coating of PTFE (tetrafluoroethylene resin) on a cover member. Moreover, as a water repellent tape, the tape which provided the adhesion layer in PTFE (tetrafluoroethylene resin) can be used, for example. In order to prevent breakage, a material in which the deterioration resistance strength of the tape is improved by combining glass fibers may be used.

  In the snow accretion prevention apparatus 100 configured as described above, since the cover member 120 is detachable from the fixing member 110, for example, during maintenance work, an operator removes the cover member 120 from the fixing member 110, There is an advantage that the workability at the tip portion 30 of 3 is not impaired. Furthermore, the snow accretion prevention device 100 can prevent the snowfall of the tip 30 of the arm metal 3 by the cover member 120 attached to the fixing member 110 covering the top of the tip 30 of the arm 3. . In other words, the snow accretion prevention device 100 reliably prevents the snow from reaching the tip 30 of the armrest 3 during snowfall without impairing the workability of working with the overhead power transmission line tower 1 during maintenance or management work, for example. can do.

  Moreover, since the snow accretion prevention apparatus 100 has a water-repellent function on the surface of the cover member 120, the snow on the surface of the cover member 120 does not accumulate, and the snow on the surface of the cover member 120 slides down to the lower part of the tower. As a result, it is possible to more reliably prevent the tip 30 of the arm metal 3 from snowing.

  Note that the cover member 120 is not limited to a flat plate as shown in FIG. 3C, and for example, a mountain-shaped (substantially inverted V-shaped) plate as shown in FIG. 6A may be used. A dome-shaped (semi-circular, substantially inverted U-shaped) plate as shown in FIG. 6B may be used. The use of a mountain-shaped or dome-shaped plate material is preferable in that snow is more slippery and is less likely to snow on the cover member 120.

  Next, with reference to FIG. 7 (A) and FIG. 7 (B), the snow accretion prevention apparatus 100a which concerns on a 1st modification is demonstrated. The snow accretion prevention device 100 a includes a fixing member 130 and a cover member 120. As shown in FIG. 7 (B), the fixing member 130 has a total of four sets including a sandwiching portion 111, angles 132a and 132b having variable mechanisms capable of changing the lot length, and one set of bolts and nuts. It is comprised from fastening part 133a, 133b, 133c, 133d. The angle 132a is an L-shaped angle, and one end is fastened to the sandwiching part 111 via the fastening part 133a, and the other end is fastened to the angle 132b via the fastening parts 133c and 133d. The angle 132b is a straight type angle, and one end is fastened to the angle 132a via fastening portions 133c and 133d, and the other end is attached to the cover member 120 via the fastening portion 133b. The fixing member 130 having such a configuration can change the lot length of the angles 132a and 132b as a whole by adjusting the fastening position of the fastening portion 133c. Thus, the inclination angle of the cover member 120 can be changed by adjusting the height of the cover member 120 from the surface of the armband suspension member 32. That is, the angles 132a and 132b and the fastening portions 133c and 133d function as the tilt angle variable mechanism 13a as a whole.

  The snow accretion prevention apparatus 100a having the above configuration can attach the cover member 120 with a desired inclined surface by making the inclination angle of the cover member 120 changeable by the inclination angle variable mechanism 13a. In other words, since the cover member 120 can be a steep slope, the snow can be slid down from the surface of the cover member 120 to the lower part of the overhead power transmission line tower 1 before a large amount of snow has accumulated on the cover member 120.

  Moreover, in the snow accretion prevention apparatus 100a which concerns on a 1st modification, the inclination | tilt angle is made high by raising the support | pillar 2 side of the cover member 120. FIG. For this reason, in the support | pillar 2 side, the cover member 120, the bracelet suspension material 32, and the clearance gap D1 become large. Therefore, as shown in FIG. 8, a cover 120 a that fills the gap D <b> 1 may be formed on the cover member 120 at the end 1201 on the support column 2 side of the cover member 120. By forming the covering portion 120a at the end portion 1201 on the support column 2 side of the cover member 120, it is possible to fill the gap D1 with the armrest suspension material 32, and intrusion of snow falling from the support column 2 toward the tip end portion 30 side. Can be prevented, and snow at the tip 30 can be further prevented.

  Next, with reference to FIG. 9 (A) thru | or FIG. 9 (C), the snow accretion prevention apparatus 100b which concerns on a 2nd modification is demonstrated. The snow accretion prevention device 100b according to the second modified example swings the cover member around the two fixing members 110, the cover member 120 that is detachably attached to the fixing member 110, and the connecting portion of the fixing member 110. And a rocking mechanism 140 to be moved. The two fixing members 110 are arranged in the same straight line, and are fixed to the armband suspension members 32a and 32b, respectively.

  The swing mechanism 140 is an elastic member (spring member) attached to a connection portion between the cover member 120 and the fixing member 110. More preferably, the swing mechanism 140 is fixed together with the fixing member 110 at a position slightly opposite to the distal end 30 side of the arm metal 3 of the cover member 120. By attaching the fixing member 110 and the swinging mechanism 140 to such a position, the cover member 120 is normally set in a substantially horizontal position, and the cover member 120 has a certain crown as shown in FIG. When the snow S is loaded, the force by which the swing mechanism 140 keeps the cover member 120 horizontal is released by the weight of the snow S. And the snow on the surface of the cover member 120 slides down when the cover member 120 inclines like a seesaw toward the distal end portion 30 of the armrest 3. Subsequently, as shown in FIG. 9C, after the snow on the surface of the cover member 120 is dropped, the cover member 120 is returned to the original position by the restoring force of the spring that is the swing mechanism 140. .

  In addition, it is preferable to dispose the springs 141 and 142 at the contact portion of the cover member 120 in the armband suspension member 32 in terms of accelerating vibration at the time of impact and reducing damage to each member.

  The snow accretion prevention device 100b according to the second modified example having the above-described configuration covers the snow accumulated on the tower column 2 side of the cover member 120 by swinging the cover member 120 by the swing mechanism 140. The member 120 can be forcibly moved to the tip 30 of the armrest 3 and shaken off.

DESCRIPTION OF SYMBOLS 1 Overhead power transmission line tower 3, 3a, 3b, 3c, 3d Arm metal 30 Tip part 110, 130 Fixing member 120 Cover member

Claims (7)

The armrest suspension material of an overhead power transmission line tower having a support column standing on the ground, an armrest main member projecting horizontally from the support column, and an armrest portion having an armrest suspension member for supporting the armrest main member. A fixing member fixed only to the tip portion of
A cover member detachably attached to the fixing member,
The fixing member has a sandwiching portion that sandwiches the armband suspension material by a claw portion that grips the armband suspension material, one end fastened to the sandwiching portion via a first fastening portion, and the other end An angle that is fastened to the cover member via two fastening portions;
Said cover member is in a state of being attached to the fixed member, than said front end portion of the cross-arm portion so as to cover the upper tip of the cross-arm portion extended to the outside by the cross-arm portions A snow accretion prevention device characterized by preventing snow accretion at the tip . The snow accretion prevention device according to claim 1, wherein the cover member is formed of a plate material, and the plate material has a flat plate shape. The snow accretion prevention device according to claim 1 or 2 , wherein a water repellent layer made of a water repellent material is formed on a surface of the cover member. The snow accretion prevention device according to any one of claims 1 to 3, wherein the fixing member has a variable mechanism capable of changing an inclination angle of the cover member. The snow accretion prevention device according to any one of claims 1 to 4 , further comprising a swinging mechanism capable of swinging the cover member with a connection portion with the fixing member as a fulcrum. A fixing member to be fixed to the armrest tip of the armature constituting the overhead power transmission line tower;
A cover member detachably attached to the fixing member,
The cover member is formed of a plate material , the plate material has a mountain shape or a dome shape, and covers the upper portion of the arm metal tip when attached to the fixing member, so that the arm metal tip A snow accretion prevention device characterized by preventing snow accretion of a part. The armrest suspension material of an overhead power transmission line tower having a support column standing on the ground, an armrest main member projecting horizontally from the support column, and an armrest portion having an armrest suspension member for supporting the armrest main member. Providing a fixing member only at the tip portion of
The cover member for preventing snow accretion by extending the tip portion of the arm-portion to the outside from the front end portion of the cross-arm portion so as to cover the upper end portion of the cross-arm portions, the fixing member And a step of detachably attaching to the snow-prevention device.

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