JP2012005225A - Approach shielding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To change a shape between a shielding state and a non-shielding state with good operability without adopting a turn mechanism of a shielding bar which is easily deteriorated in a severe environment such as on a steel tower in an approach shielding device which is fitted to a transmission line tower and inhibits an operator approaching a high voltage power line in a live state.SOLUTION: The approach shielding device installed on a cross arm 101 of the transmission line tower includes a metal fitting 31 fixed to a steel material constituting the cross arm and a shielding bar 50 supported by the metal fitting. The shielding bar includes a fixing member 51 supported by the metal fitting, movable members 55 which are supported by both ends of the fixing member so that they freely swing, and fixing means 20 fixing the movable members to the fixing member in a prescribed posture.

Description

  The present invention relates to an improvement in an access shielding device installed to prevent personnel working on a power transmission tower from being too close to an overhead power transmission line.

When carrying out periodic inspections on high-voltage transmission lines installed on power transmission towers, inspections and repairs in the event of an abnormality such as an accident, it is necessary for workers to climb the steel towers and work closer to the transmission lines. However, when a high-voltage transmission line is in a live state, there is a high risk of an electric shock just by approaching the worker without touching the high-voltage transmission line. An approach blocking device is used as means for preventing the overhead transmission line from being too close (Patent Document 1).
The access blocking device according to Patent Document 1 includes a metal fitting fixed to a steel material constituting the armature of a power transmission tower, and a blocking bar that is rotatably supported by the metal fitting and fixed to the metal fitting by a bolt, The direction of the blocking bar can be changed (rotated) without loosening or retightening the bolt. When blocking workers from approaching high-voltage transmission lines that are in a live state, the blocking rod is fixed in a blocking posture that is substantially perpendicular to the steel material that constitutes the brace, and physically prevents workers from approaching. And psychologically warning. On the other hand, when allowing the worker to approach the power transmission line, such as when the power transmission line is in a power failure state, the blocking bar in the blocking posture is rotated 90 degrees and fixed in a posture parallel to the steel material. In addition, this access blocking device is slidable to the end of one blocking rod when the blocking rods attached to the two handrails projecting opposite each other on the armature of the monopole tower are in the blocking state. Durability is improved by fitting and connecting the end of the other blocking bar in a tubular connecting portion provided in the above.

However, this access blocking device is suitable for application to a monopole tower equipped with a pair of handrails on the armrest, but there is a problem that it is difficult to apply to the armature of a conventional tower constructed by assembling steel materials. . Further, since the number of parts is large, the configuration may be complicated and the cost may increase. In addition, the rotating part of the metal fitting deteriorates over time in a harsh environment such as on a steel tower, rusts and becomes unable to rotate, and the connecting member and blocking bar are stuck and cannot slide and cannot be separated. Is assumed.
Patent Document 2 discloses an access blocking device that is attached to the arm of a power transmission tower made of a steel material. The bracket that inserts and supports the intermediate portion of the blocking rod is operated without using a tool, and the blocking rod is rotated 90 degrees. Although the structure to be moved is disclosed, there is a problem in durability because the metal shaft part, the spring that urges the shaft part, etc. are provided on the metal fitting, and it is impossible to operate due to deterioration over time and rusting There is a possibility of falling into.

JP 2006-333558 A JP 09-219916 A

  The present invention has been made in view of the above, and in an access blocking device that is attached to a power transmission tower and prevents an operator from approaching a high-voltage power transmission line that is in a live state, in a severe environment on the steel tower. The purpose of the present invention is to change the shape of the blocking bar between the blocking state and the non-blocking state without adopting a rotating mechanism of the blocking bar which is easily deteriorated.

In order to achieve the above object, the invention according to claim 1 is an access blocking device mounted on a metal arm of a power transmission tower, and is supported by a metal fitting fixed to a steel material constituting the metal arm. A blocking member that is supported by the metal fitting, a movable member that is pivotally supported by both ends of the fixing member, and a fixed member. And a fixing means for fixing each movable member in a predetermined posture.
The invention according to claim 2 is an access blocking device mounted on a metal arm of a power transmission tower, and is supported by a metal fitting fixed to a steel material constituting the metal arm, two wires, and the metal fitting. A blocking member, and the blocking rod includes a fixed member supported by the metal fitting, and a movable member pivotally supported by both end portions of the fixing member. A through hole is formed on the side surface, and an insertion hole communicating with the through hole is formed on the other surface of the fixing member. The metal fitting is a hollow tube metal fitting that passes through the fixing member. A main body, a screw rod having a male screw portion inserted into a bolt hole formed in one wall surface of the metal fitting main body and an insertion hole of the metal fitting main body, and a large-diameter head fixed to one end portion of the screw rod A bolt member provided between the one wall surface of the metal fitting body and the fixing member. And a fixing member having a screw hole into which the male screw portion of the screw rod is screwed, and a fixing member that is loosely fitted in the through hole of the fixing member and the screw rod is inserted and fixed in the center portion. A disc-shaped wire drum having a hole, and each of the wires is fixed to the movable member and the other portion is fixed to the wire drum to rotate the bolt member forward and backward. Thus, the wire drum is integrally rotated forward and backward so that the wires are wound around and fed out to the outer periphery of the wire drum to swing the movable members.

According to a third aspect of the present invention, in the second aspect of the present invention, both end portions in the longitudinal direction of the restraining member are projected outward from both end openings of the metal fitting body.
According to a fourth aspect of the present invention, in the second or third aspect, an opening that communicates with the through hole of the fixing member is formed in the mold body.

  According to the access blocking device of the present invention, since the blocking bar is composed of the fixed member fixed to the armature of the tower and the movable member supported to be swingable by the fixed member, the configuration is simplified, Therefore, the shape of the blocking bar can be changed between a blocking state and a non-blocking state with good operability.

(A) is the plane schematic which shows the state which attached the access cutoff device which concerns on one Embodiment of this invention to the armrest of the power transmission tower, (b) is a front view which shows the interruption | blocking state by a interruption | blocking bar, (c ) Is a cross-sectional view taken along line AA of (b), (d) is a perspective view in a blocked state, and (e) is a front view showing a non-blocked state. (A) And (b) is the bottom view which shows the state which the fixing means supports the movable member, and the bottom view which shows the state which does not support the movable member, (c) is the movable member by a fixing means. It is sectional drawing which shows a support state. (A) And (b) is a top view which shows the state which attached the access-blocking apparatus which concerns on other embodiment of this invention to the armrest of the power transmission tower, and the front view which shows the attachment state to an armrest. (A) And (b) is a front view which shows the interruption | blocking state of an approach interruption | blocking apparatus, and a non-blocking state. (A) And (b) is explanatory drawing which shows the interruption | blocking state by the interruption | blocking bar | burr, and a non-blocking state. (A) And (b) is a side view which shows the structure of a metal fitting, and the perspective view of a metal fitting, (c) And (d) is a structure explanatory drawing of a wire drum.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.
FIG. 1 (a) is a schematic plan view showing a state in which an access blocking device according to an embodiment of the present invention is attached to a brace of a power transmission tower, (b) is a front view showing a blocking state by a blocking bar, (C) is AA sectional drawing of (b), (d) is a perspective view of the interruption | blocking state, (e) is a front view which shows a non-blocking state, Fig.2 (a) and (b) ) Is a bottom view showing a state where the fixing means supports the movable member, and a bottom view showing a state where the fixing member is not supported, and (c) is a cross-sectional view showing a support state of the movable member by the fixing means. It is.
The access cutoff device 1 is a means for preventing an operator from approaching the high-voltage power transmission line 102 supported by the arm metal by projecting the interruption bar horizontally while being mounted on the arm metal 101 of the power transmission tower 100. is there.
The access blocking device 1 includes a metal fitting 2 that is fixed to a steel material 101a constituting the arm metal 101, and a blocking bar 5 that is supported by the metal fitting.

The blocking bar 5 is fixed to the fixed member 6 supported by the metal fitting 2, the movable member 10 pivotally supported by the hinge portions 7 provided at both ends of the fixed member so as to be swingable in the vertical direction, and the fixed member 6. Fixing means 20 for fixing each movable member 10 in a predetermined posture (blocking posture).
The blocking bar 5 of this example is a tubular body having a square cross-section, but the blocking bar may have a circular or other arbitrary shape, or the blocking bar may not be a hollow body such as a tube. Also good. The blocking bar is preferably made of an insulating material such as resin.
The metal fitting 2 is a means for securing the strength when the fixing member 6 constituting the blocking bar 5 is fixed to the armature steel material 101a, and there is no problem in strength even if the fixing member 6 is directly fixed to the steel material 101a. Can omit the metal fittings.
The metal fitting 2 is a rectangular column-shaped tube body having an inner surface shape that matches the outer surface shape of the fixing member 6, and the fixing member 6 is inserted into the inside thereof and fixed by screwing, bonding, caulking, or the like. Arbitrary means such as a stainless steel band 3 is used as means for fixing the metal fitting and the fixing member to the steel member 101a of the arm metal. In this example, two stainless steel bands 3 are wound around the steel material 101a in a state where the two stainless steel bands 3 are inserted from both ends in the axial direction of the metal fitting, and the end portions of the stainless steel bands are fixed by the fastener 3a.

The movable member 10 is pivotally supported by a hinge portion 7 provided at the lower edge of both end portions of the fixed member 6 so that the lower edge portion can be pivoted in the vertical direction, and is shown in the shut-off state shown in FIGS. It is possible to rotate in the vertical direction between the ascending posture) and the non-blocking state (lowering posture) shown in FIG. In this example, in the cut-off state, the movable member 10 is in a substantially horizontal state as shown in FIGS. 1B and 1A, and the worker moves to the high-voltage power transmission line 102 at the tip of the arm bracket 101. Stop. On the other hand, in the non-blocking state, the movable member 10 is in a lowered state as shown in FIGS. 1C and 1A, and the worker is allowed to move to the high-voltage power transmission line side.
The fixing means 20 is a means for holding the movable member 10 in a cut-off state. The fixing means 20 according to this example is a locking piece 21 pivotally supported by a shaft portion 21 a provided at one end on the bottom surface of the fixing member 6. The locking piece 21 is dimensioned so that it can support the bottom surface of the movable member when protruding to the movable member side, and a bent portion 21b provided at the tip thereof is inserted into the fitting groove 11 provided on the bottom surface of the movable member. It is comprised so that it may fit. When the bent portion 21b is fitted in the fitting groove 11, the locking piece 21 can be supported so that the movable member 10 does not descend.

  According to the access blocking apparatus according to this embodiment, according to the access blocking apparatus according to this embodiment, since the blocking bar is composed of a fixed member and a movable member, the number of parts is small, the configuration is simple, and the durability is high. It is good, there are few failures, and cost can be reduced. Furthermore, it is difficult to deteriorate and rust over time in a severe environment on a steel tower, and the movable member does not fall vertically.

Next, an access blocking apparatus according to another embodiment of the present invention will be described.
3 (a) and 3 (b) are a plan view showing a state in which an access blocking device according to another embodiment of the present invention is attached to a brace of a power transmission tower, and a front view showing an attached state to the brace. 4 (a) and 4 (b) are front views showing the blocking state and the non-blocking state of the access blocking device, and FIGS. 5 (a) and 5 (b) show the blocking state and the non-blocking state by the blocking bar. FIGS. 6A and 6B are a side view and a perspective view of the metal fitting, and FIGS. 6C and 6D are a drawing explaining the structure of the wire drum.
The access blocking device 30 includes a metal fitting 31 that is fixed to the steel material 101 a constituting the arm metal 101, two wires 45, and a blocking bar 50 that is supported by the metal fitting 31.
The blocking bar 50 includes a fixed member 51 supported by the metal fitting 31 and a movable member 55 that is pivotally supported in the vertical direction by hinge portions 52 provided at both ends of the fixed member.

As shown in FIG. 5, a through hole 51a is formed on the side surface of the fixing member 51, and an insertion hole 51b communicating with the through hole 51a is formed on the other surface of the fixing member.
The metal fitting 31 includes a hollow tube metal fitting body 32 that is inserted through the fixing member 51, a bolt hole 32a formed on one wall surface (upper surface) of the metal fitting body, and a male screw portion that is inserted through the fixing member insertion hole 51b. And a bolt member 35 having a large-diameter head portion 35b fixed to one end of the screw rod, and a screw rod 35a. A holding member 37 having a screw hole 37a into which the male screw portion of the screw member is screwed, and a fixing hole 40a which is arranged in a loosely fitted state in the through hole 51a of the fixing member and in which the screw rod 35a is inserted and fixed in the center portion. And a disk-shaped wire drum 40 having two grooves 40b on the outer peripheral surface.
A part of each wire 45 is fixed to an appropriate position of each movable member 55 and the other part is fixed to the outer peripheral surface of the wire drum 40. In this example, one end of each wire 45 is fixed at an appropriate position inside each pipe-shaped movable member 55, and the other end of each wire 45 is locked to the groove 40 b on the outer periphery of the wire drum 40.
The two grooves 40b are not essential, and it is sufficient if there is one recess capable of winding two wires on the outer peripheral surface of the wire drum.

By rotating the bolt member 35 forward and backward using a tool such as a monkey spanner or pliers, the wire drum 40 integrally rotates forward and backward, and the wires 45 are simultaneously wound into the grooves 40b on the outer periphery of the wire drum, Each movable member is configured to move up and down by simultaneously sending out from each groove. When each wire 45 is wound up simultaneously, each movable member rises, and conversely, when each wire is sent out simultaneously, the movable member descends.
When the metal fitting 31 is assembled to the fixing member 51, the wire drum 40 is disposed in advance in a through hole 51a formed through the side surface of the fixing member, and the metal fitting body 32 is assembled to the outside of the fixing member in this state. .
Subsequently, the screw rod 35a of the bolt member is inserted from the bolt hole 32a of the upper wall of the metal fitting body with the holding member 37 inserted between the fixing member and the upper wall of the metal fitting body. At this time, the screw rod is inserted into the holding member. The screw hole 37a, the insertion hole 51b on the upper surface of the fixing member, and the fixing hole 40a of the wire drum 40 are sequentially inserted. When the screw rod 35a is inserted into the fixing hole 40a of the wire drum, a jagged locking surface provided on the inner wall of the fixing hole 40a is fixed and integrated with the screw rod 35a. When the bolt member 35 is rotated, the bolt hole 32a and the insertion hole 51b and the screw rod 35a are idle. On the other hand, since the male screw portion of the screw rod 35a and the screw hole 37a of the holding member are in a screwed state, the holding member 37 moves forward and backward by rotating the bolt member forward and backward. For this reason, the holding member 37 can hold and hold the fixing member between the lower wall of the metal fitting body and can release the holding state.

Alternatively, the bolt hole 32a, the insertion hole 51b, etc. may be set as female screw holes and screwed into the screw rod 35a.
By screwing and fastening the screw rod 35a and each female screw portion, the movable member can be held at the raised position and the lowered position.
Note that an opening 32A (FIG. 6) for exposing the through hole 51a of the fixing member is formed on one side surface of the metal fitting body 32 in order to facilitate the work of assembling a part such as a wire drum to the fixing member. May be.
In addition, the operation | work which attaches the metal fitting 31 with respect to the interruption | blocking bar | burr 50 is not necessarily implemented on a power transmission tower, but is implemented in a factory etc.
By projecting both ends in the longitudinal direction of the holding member 37 from the openings at both ends of the metal fitting body 32 to the outside, the movable member is lifted by cooperation with the pulling force by the wire 45 in the shut-off state shown in FIG. The posture of time can be maintained.
Further, the holding member 37 is appropriately provided with a shape for avoiding interference with the movable member so that the holding member 37 does not interfere with the movable member at the blocking position.

According to the access blocking device according to this embodiment, unlike the conventional product in which a single long blocking bar is rotated in the horizontal direction, the blocking bar is composed of a fixed member and a movable member, and the bracket side bolt Since the wire is configured to operate the movable member by manipulating the member, the number of parts is small, the configuration is simple, the durability is good, the failure is small, and the cost can be reduced. Furthermore, it is difficult to deteriorate and rust over time in a severe environment on a steel tower, and the movable member does not fall vertically.
In each of the above embodiments, the movable member is moved in the vertical direction. However, the movable member may be moved in the horizontal direction or in the oblique direction.

DESCRIPTION OF SYMBOLS 1 ... Access blocking device, 2 ... Metal fitting, 3 ... Stainless steel band, 3a ... Fastener, 5 ... Blocking bar, 6 ... Fixing member, 7 ... Hinge part, 11 ... Fitting groove, 20 ... Fixing means, 21 ... Locking Piece, 21a ... Shaft part, 21b ... Bending part, 30 ... Access blocking device, 31 ... Metal fitting, 32 ... Metal fitting body, 32A ... Opening, 32a ... Bolt hole, 35 ... Bolt member, 35a ... Screw rod, 35b ... Head 37 ... restraining member, 37a ... screw hole, 40 ... wire drum, 40a ... fixing hole, 40b ... groove, 45 ... wire, 50 ... blocking bar, 51 ... fixing member, 51a ... through hole, 51b ... insertion hole, 52 ... Hinge part, 55 ... Moveable member

Claims (4)

An access blocking device equipped on the arm of the transmission tower,
A metal fitting fixed to the steel material constituting the arm metal, and a blocking bar supported by the metal fitting,
The blocking bar includes a fixed member supported by the metal fitting, a movable member pivotally supported by both ends of the fixed member, and each movable member in a predetermined posture with respect to the fixed member. An access blocking device comprising: a fixing means for fixing. An access blocking device equipped on the arm of the transmission tower,
A metal fitting fixed to the steel material constituting the arm metal, two wires, and a blocking bar supported by the metal fitting,
The blocking bar includes a fixed member supported by the metal fittings, and a movable member pivotally supported by both end portions of the fixed member, respectively.
A through hole is formed on the side surface of the fixing member, and an insertion hole communicating with the through hole is formed on the other surface of the fixing member.
The metal fitting has a hollow tube metal fitting body through which the fixing member is inserted, a bolt hole formed on one wall surface of the metal fitting main body, and a screw having a male screw portion inserted through the metal fitting insertion hole. A rod member, a bolt member having a large-diameter head fixed to one end portion of the screw rod, a male screw portion of the screw rod interposed between one wall surface of the metal fitting body and the fixing member A holding member having a screw hole into which the screw rod is screwed, and a disk-shaped wire drum having a fixing hole which is disposed in a loosely fitted state in the through hole of the fixing member and into which the screw rod is inserted and fixed at the center. With
Each of the wires is partially fixed to the movable members and the other part is fixed to the wire drum,
By rotating the bolt member forward and backward, the wire drum is integrally rotated forward and backward so that the wires are wound around the wire drum and fed out to swing the movable members. An access blocking device characterized by that.   The approach blocking apparatus according to claim 2, wherein both end portions in the longitudinal direction of the holding member protrude outward from both end openings of the metal fitting body.   The access blocking device according to claim 2, wherein an opening communicating with the through hole of the fixing member is formed in the mold body.

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