JP2018107937A - Fall prevention net device for multi-conductor aerial scaffold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fall prevention net for multi-conductor aerial scaffold capable of surely preventing a component (a spring, in particular) that is scattered when removing an inter-diameter spacer, from falling onto the ground.SOLUTION: The present invention relates to a fall prevention net device for multi-conductor aerial scaffold comprising: a lower frame that is provided around a lower part of multi-conductor aerial scaffold; an upper frame that is coupled to the lower frame and provided around an upper part of the multi-conductor aerial scaffold; a lower net that covers the lower frame; and an upper net that covers the upper frame. A conductor passing opening which is formed in such a manner that conductors constituting an overhead transmission line of a multi-conductor can pass, and an opening/closing part which is formed in such a manner that a member mounted on the overhead transmission line can pass are provided on a front face and a back face of the upper net. The multi-conductor aerial scaffold is disclosed in all front, rear, right, left, upper and lower directions by the lower and upper nets.SELECTED DRAWING: Figure 1

Description

  The present invention is a fallen object that is detachably mounted on an overhead power transmission line, particularly a multiconductor hoist for power transmission work that is suspended and traveling on a multiconductor overhead power transmission line, and falls from the power transmission line due to the work of the power transmission line. The present invention relates to a fall-prevention net device for a multi-conductor hoist that collects water.

  Conventionally, in a multiconductor overhead transmission line, a span spacer is provided between the transmission lines in order to prevent damage due to collision between the transmission lines. The installation and removal of the span spacer is carried out by the operator getting on the air hoist that is suspended from the power transmission line, and the net device for preventing falling objects is detachably attached to the air hoist. A technique is known that collects falling objects falling from power transmission lines and the like to prevent them from falling to the ground. As a conventional net device for preventing fallen objects, for example, the “working aid for a suspension machine” of the invention described in Patent Document 1 and “the suspension for power transmission line work” of the invention described in Patent Document 2 There is a “net device for preventing the aircraft from falling”, “a protective net for airborne aircraft” of the invention described in Patent Document 3 and the like. The inventions described in Patent Documents 1 to 3 are intended to prevent the removed parts from dropping to the ground when the difficult snow ring attached to the overhead power transmission line is removed or replaced.

  Here, FIG. 8 shows a four-conductor boltless spacer as the span spacer 100. FIG. 8A is an overall view of the span spacer 100, showing a state where it is removed from the overhead power transmission line, and FIG. 8B is an enlarged view of the main part of FIG. 8A. As shown in the figure, the interstitial spacer 100 often employs a cam pin system by adhering, and in this cam pin system, it is difficult to loosen the clamp portion 101. A method of threading the saucer bolt of the clamp part 101 with a pipe wrench or the like is employed. However, when the saucer bolt is threaded, there is a risk that the spring 102 will scatter in the vertical and forward / backward / left / right directions and fall to the ground as it is. There are safety issues.

Japanese Utility Model Publication No. 63-040107 Registered Utility Model No. 3140880 JP 2009-247166 A JP 2010-268634 A

  The inventions described in Patent Documents 1 and 2 describe in Patent Document 4 that "the ones in Patent Documents 1 and 2 above are a net body for collecting falling objects, above the seat plate on which the operator of the air hoist sits. Although the openings are located, the net openings are located below the transmission line, so when an operator works on the air hoist, for example, it is attached to the transmission line. A light and easy-to-jump electric wire accessory, such as a hard-to-snow ring, will scatter to the top of the power line and spill out of the net body during removal. Therefore, these conventional nets have the disadvantage that not all fallen objects can be collected "(see paragraph" 0005 "), which occurs when the span spacer is removed. Spattering parts jump over the net and fall downward There is. The same problem is assumed in the invention described in Patent Document 3. In particular, when removing the span spacer, the countersunk bolt of the clamp portion of the span spacer is threaded with a pipe wrench, etc., so that the biased spring may be scattered in an unpredictable direction due to the restoring force. In the inventions described in Patent Documents 1 to 3, the scattered spring jumps over the net and falls downward, and there is a high risk that the facility will be damaged or the workers on the ground will be injured. The spring constituting the interstitial spacer has a much larger elastic force than the hard-to-snow ring, so the scattering distance becomes longer and the risk of jumping over the net and falling to the ground is high.

  On the other hand, although the invention described in Patent Document 4 has been improved compared to the inventions described in Patent Documents 1 to 3, “This invention is based on such prior art, A net covering the upper part of the airliner and above the power transmission line is provided, and even if the wire accessories and tools are scattered or fallen when working on the airliner, all of these can be collected. The purpose is to provide a full net type fallen object prevention device "(see paragraph" 0006 ")," Through this, the power transmission line around the spacecraft B excluding the rear portion of the spacecraft B. When C is surrounded by the net 6 ”(see paragraph“ 0024 ”), it is not surrounded by the“ net 6 ”when used to remove the span spacer. There is a high risk that the scattered spring will fall to the ground from the rear of the Aircraft BIn practice, it is impossible to thread the saucer bolt by controlling the scattering direction so that the spring (coil spring) is always scattered in the net.

  In addition, the fall prevention net device that is detachably attached to the hoist is required to be lightweight, easy to install, and to have good workability in the net.

  Accordingly, the present invention has been made to solve the above-described problem, and by surrounding the direction in the front, rear, left, right, top and bottom of the air hoist with a net, a component (particularly, a spring) that scatters when the span spacer is removed. It is an object of the present invention to provide a fall prevention net for a multiconductor hoist that can surely prevent a fall to the ground.

  Another object of the present invention is to provide a fall prevention net for a multiconductor hoist that is lightweight, easy to mount, and has good workability in the net.

  In order to achieve the above object, the invention of claim 1 is detachably attached to a multiconductor hoist for transmission line work that is suspended and traveled by a multiconductor overhead power transmission line. A fall prevention net device for a multiconductor hoist that is configured to collect falling objects that fall due to work of an electric wire, a lower frame provided around a lower portion of the multiconductor hoist, and the lower portion An upper frame connected to a frame and provided around the upper portion of the multiconductor hoist, a lower net covered by the lower frame, and an upper net covered by the upper frame, On the front and back of the upper net, a conductor passage opening formed so that each conductor constituting the multi-conductor overhead power transmission line can pass, and a member attached to the overhead power transmission line can be passed. An opening / closing part provided, All directions of the left and right upper and lower front and rear Chu riding machine is characterized in that it is surrounded by the lower and upper nets.

  The invention according to claim 2 is the fall prevention net device for a multiconductor hoist according to claim 1, wherein the upper net is composed of a left upper net and a right upper net having the same shape, The upper net and the right upper net are detachably connected to each other.

  Further, the invention of claim 3 is the fall prevention net device for a multiconductor hoist according to claim 1 or 2, wherein the multiconductor hoistor includes an overhead power transmission line of the multiconductor. A mounted moving pulley and a pedestal installed below the moving pulley are provided, and a member attached to the overhead power transmission line is a span spacer.

  According to the fall prevention net device for a multiconductor hoist according to the present invention, a part (particularly, a spring) that scatters when the span spacer is removed by covering the front, rear, left, right, upper, and lower directions of the multiconductor hoist with a net. The remarkable effect that the fall to the ground can be surely prevented.

  Moreover, according to the fall prevention net device for a multiconductor hoist according to the present invention, it is lightweight, easy to install, and has good workability in the net, so that the manufacturing cost can be reduced and installed. The work can be performed in a short time, and there is a remarkable effect that the safety and efficiency during the work can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. It is a disassembled perspective view explaining the lower frame and lower net | network of the fall prevention net apparatus for multiconductor suspension machines which show embodiment of this invention. It is a disassembled perspective view explaining the upper frame and upper net | network of the fall prevention net apparatus for multiconductor suspension machines which show embodiment of this invention. FIG. 3 is a development view of the lower net in FIG. 2. FIG. 4 is a development view of the upper net in FIG. 3. It is a side view explaining the use condition of the fall prevention net apparatus for multiconductor air hovers of FIG. It is a front view explaining the use condition of the fall prevention net apparatus for multiconductor air hovers of FIG. It is a figure explaining the interstitial spacer which the removal operation was completed.

  Hereinafter, the present invention will be described more specifically with reference to preferred embodiments. However, the following embodiment is merely an example embodying the present invention, and the present invention is not limited to this.

(Embodiment)
A fall prevention net device for a multiconductor hoist according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an overall perspective view of a fall prevention net device for a multiconductor hoist, and FIG. 2 is an exploded perspective view for explaining a lower frame and a lower net constituting the fall prevention net device for a multiconductor hoist. FIG. 3 is an exploded perspective view for explaining the upper frame and the upper net of the fall prevention net device for a multiconductor hoist, and FIG. 4 is an exploded view of the lower net in FIG. FIG. 5 is a development view of the upper net in FIG. 3, FIG. 6 is a side view for explaining a use state of the fall prevention net device for a multiconductor hoist, and FIG. 7 is for a multiconductor hoist. It is a front view explaining the use condition of a fall prevention net apparatus, and FIG. 8 is a figure explaining the span spacer which the removal operation was completed. For convenience of explanation, arrows in the figure indicate directions and correspond to the directions described in the following explanation.

  Referring to FIG. 1, a multi-conductor hoisting apparatus 1 according to the present invention includes a front / rear / left / right / up / down of a multi-conductor hoist 2 mounted with a plurality of pulleys suspended on a multi-conductor overhead wire. All directions are surrounded by a net. For this reason, during removal work of span spacers attached to multi-conductor overhead power transmission lines, the span spacer springs are collected by the net regardless of the front, back, left, right, top or bottom direction. Can be reliably prevented from falling to the ground, protect the facilities below (transverse objects), and ensure the safety of ground workers, etc. As compared with the prior art including, a remarkable effect can be achieved. In FIG. 1, the overhead power transmission line and the span spacer are not shown.

  The fall prevention net device 1 for a multiconductor hoist has a lower frame 3 attached to the multiconductor hoist 2, an upper frame 4 attached to the multiconductor hoist 2 connected to the lower frame 3, A lower net 5 that covers the lower frame 3 and an upper net 6 that covers the upper frame 4 are provided. Conductor passing openings 7 are formed in the front and back portions of the upper net 6 so that the conductors constituting the multiconductor overhead power transmission line can pass therethrough. The diameter of the conductor passage opening 7 is formed such that scattered objects do not jump out from the gap between the conductor passage opening 7 and the passage conductor. In the present embodiment, since a four-conductor overhead electric wire is assumed, four conductor passage openings 7 are formed on the front surface of the upper net 6 and four on the back surface.

  The lower net 5 is formed in a basket shape having an opening on the upper side. In other words, the lower surface of the lower net 5 and the left and right front and rear side surfaces are formed of connected nets. At the left and right ends of the opening of the lower net 5, a securing opening 8 a is opened, and at the front end and the rear end of the opening of the lower net 5, a twist-type hook 9 a is provided. .

  The upper net 6 is formed in a shape in which the lower net 5 is turned upside down. In other words, the upper surface of the upper net 6 and the front and rear side surfaces are formed by connected nets. Secured apertures 8b are opened at the left and right ends of the opening of the upper net 6, and a twist type corresponding to the twist hook 9a is provided at the front end and the rear end of the opening of the upper net 6. A hook portion 9b is provided.

  The fixed opening 8a of the lower net 5 and the lower frame 3 are each secured by a string, whereby the lower net 5 and the lower frame 3 are connected and fixed. The securing hole portion 8b of the upper net 6 and the upper frame 4 are each secured by a string, whereby the upper net 6 and the upper frame 4 are connected and fixed. Further, the torsional hooks 9a and 9b are constructed and connected to males and females (or females and males), respectively, so that the front end portion of the opening portion of the lower net 5 and the opening portion of the upper net 6 are provided. The front end of the lower net 5 can be easily attached and detached, and the rear end of the opening of the lower net 5 and the rear end of the opening of the upper net 6 can be easily attached and detached. As will be described in detail later, the upper net 6 is composed of a left upper net 6a and a right upper net 6b, and the left upper net 6a and the right upper net 6b are connected by twist-type hooks 10a and 10b. Has been.

  With reference to FIG. 2 and FIG. 3, the internal structure of the fall prevention net device 1 for a multiconductor hoist according to the present embodiment will be described. In addition, please refer to other drawings as needed. First, in FIG. 2, the multiconductor hoist 2 includes a moving pulley A, a connecting portion 2 a, and a pedestal B. In the present embodiment, since a four-conductor overhead transmission line is assumed, the moving pulley portion A is configured to run while being suspended by four conductors. It has two pairs of front and rear pulleys A1 for traveling on two conductors and a pair of pulleys A2 for traveling on two upper conductors. Moreover, the pulley A for movement is connected with the base part B used as a scaffold of an operator via the connection part 2a.

  The lower frame 3 includes a left lower frame 3 a and a right lower frame 3 b disposed around the left and right lower portions of the multiconductor hoist 2. The left lower frame 3a and the right lower frame 3b are connected by connecting members 3c, 3d, 3e, and 3f at the front end portion, the rear end portion, and the central portion, respectively. The central portions of the connecting members 3c and 3d may be connected by a coupler. Further, the connecting members 3 e and 3 f are also connected to the multiconductor hoist 2.

  As described above, the lower net 5 is formed in a basket shape having an opening on the upper side, and the lower surface of the lower net 5 and the left and right side surfaces are formed by connected nets. As clearly shown in FIG. 2, a plurality of lashing openings 8 a are formed at the left and right ends of the opening of the lower net 5, and the front end and the rear end of the opening of the lower net 5 are formed. Are provided with a plurality of torsional hooks 9a. The lower net 5 is covered with the lower frame 3 in the direction of the white arrow in FIG. As a result, the lower frame 3 attached to the multiconductor hoist 2 is surrounded by the lower net 5 in the front / rear / left / right lower direction.

  FIG. 3 shows a state in which the upper frame 4 is connected to the lower frame 3 on which the lower net 5 is mounted, and the upper net 6 is covered on the upper frame 4. The upper frame 4 has a left upper frame 4a and a right lower frame 4b disposed around the left and right upper portions of the multiconductor hoist 2. The left upper frame 4a and the right upper frame 4b are connected by connecting members 4c, 4d, and 4e at the front end, the rear end, and the center, respectively. The connecting members 4c, 4d, and 4e may be connected at the center by a coupler.

  As described above, the upper net 6 is formed in a shape in which the lower net 5 is turned upside down, and the upper surface of the upper net 6 and the left and right front and rear side surfaces are formed of connected nets. As clearly shown in FIG. 3, a plurality of lashing openings 8 b are formed at the left and right ends of the opening of the upper net 6, and the front end and the rear end of the opening of the upper net 6 are formed. Are provided with a plurality of twisted hook portions 9b. Conductor passing openings 7 are formed in the front and back portions of the upper net 6 so that the conductors constituting the multiconductor overhead power transmission line can pass therethrough. Since the present embodiment assumes a four-conductor overhead transmission line, the conductor passage openings 7 are provided at four locations on the front surface of the upper net 6 and four locations on the rear surface. As will be described later, the upper net 6 is composed of a left upper net 6a and a right upper net 6b having the same shape, and the left upper net 6a and the right upper net 6b are easily twisted by hook-type hook portions 10a and 10b. It is detachably connected to. The front and back of the upper net 6 can be opened and closed by detaching the front and rear twist hooks 10a and 10b of the upper net 6, and the front part of the upper net 6 can be opened and removed when the span spacer is carried in and out. And the back part may be opened and closed. The front portion of the upper net 6 provided with the twisted hook portions 10a, 10b is referred to as a front opening / closing portion 11a, and the rear portion of the upper net 6 provided with the twisting hook portions 10a, 10b is referred to as a rear opening / closing portion 11b. The upper net 6 is covered on the upper frame 4 in the direction of the white arrow in FIG. As a result, the upper frame 4 attached to the multiconductor hoist 2 is surrounded by the upper net 6 in the front / rear / left / right upper direction. The multiconductor hoist 2 is surrounded by the lower net 5 and the upper net 6 in all the front, rear, left, and right directions.

  FIG. 4 is a development view of the lower net 5. The lower net 5 includes a rectangular bottom net 20, a left side lower net 21 and a right side lower net 22 connected to the left and right ends of the bottom net 20 in the longitudinal direction. At the front and rear ends of the bottom net 20, the aforementioned twisted hook portion 9 a is formed, and at the left end of the left side lower net 21, the above-mentioned securing aperture 8 a is opened, and the right side lower net 22. The above-described securing hole portion 8a is opened at the right end portion. The bottom net 20, the left side lower net 21, and the right side lower net 22 are formed so as to be rotatable at the connecting portion. The front part and the rear part of the bottom net 20 form the front surface and the back surface of the lower net 5, respectively.

  FIG. 5 is a development view of the upper net 6. As described above, the upper net 6 includes the left upper net 6a and the right upper net 6b having the same shape. The left upper net 6a includes a rectangular left top net 30a and a left side upper net 30b connected to the left end in the longitudinal direction of the left top net 30a. The above-described twisted hook portion 10a is formed at the right end portion of the left top net 30a, the above-described twisted hook portion 9b is formed at the front and rear end portions, and the above-described conductor passage openings are respectively formed at the front and rear portions. Two portions 7 are formed in the longitudinal direction. The above-described securing hole 8b is opened at the left end of the left side upper net 30b. The left top net 30a and the left side upper net 30b are formed so as to be rotatable at the connecting portion.

  Similarly, the right upper net 6b includes a rectangular right net 30c and a right upper net 30d connected to the right end in the longitudinal direction of the right net 30c. The above-described twisted hook portion 10b is formed at the left end portion of the right top net 30c, the above-described twisted hook portion 9b is formed at the front and rear end portions, and the above-described conductor passage openings are respectively formed at the front and rear portions. Two portions 7 are formed in the longitudinal direction. The above-described securing hole 8b is opened at the right end of the right side upper net 30d. The right top net 30c and the right side upper net 30d are formed to be rotatable at the connecting portion.

  The front and rear portions of the left top net 30a and the front and rear portions of the right top net 30c form the front surface and the back surface of the upper net 6 described above. Further, the vicinity of the front and rear opening / closing portions 11a and 11b of the left and right top net 30a and the vicinity of the front and rear opening and closing portions 10a and 10b of the right and left top net 30c constitute the front opening and closing portion 11a and the rear opening and closing portion 11b.

  FIGS. 6 and 7 are views for explaining a state in which the multi-conductor hoisting fall prevention net device 1 of the present embodiment is installed on a four-conductor overhead transmission line C that is installed in a factory in a simulated manner. FIG. 6 is a side view. FIG. 7 is a view as seen from the front (front), and shows a state where the worker H is riding on the base B. The multiconductor hoist 2 is detachable from the four-conductor overhead transmission line C. The four-conductor overhead transmission line C is composed of four conductors C1, C2, C3, and C4. As shown in the drawing, the fall prevention net device 1 for a multiconductor hoisting machine includes all of the front, rear, left, right, upper, and lower sides of the multiconductor hoisting machine 2 mounted with a plurality of pulleys suspended on a four-conductor overhead wire C. Is surrounded by the lower net 5 and the upper net 6. For this reason, when removing the span spacers attached to the four-conductor overhead transmission line C, the spring of the span spacers is collected by the lower net 5 and the upper net 6 regardless of the forward / backward, left / right, upper / lower directions. As a result, it is possible to reliably prevent the flying object from falling to the ground, protect the facility below (transverse object), and ensure the safety of ground workers and the like.

  The fall prevention net device 1 for a multiconductor hoisting machine according to this embodiment has a single component maximum weight of 5 kg or less, and realizes a total weight of the anti-falling net device 1 for a multiconductor hoisting machine of 35 kg. I was able to. In addition, by providing a space of 0.3 m on the left and right of the rear part of the multiconductor hoist 2 and 1.0 m on the front part, it was possible to form a space where two workers could work. The installation time of the fall prevention net device 1 for a multiconductor hoist was 15 minutes, and installation in a short time became possible.

  In the present embodiment, the case where the overhead power transmission line is a four-conductor system has been described, but the present invention can also be applied to multi-conductor overhead power transmission lines other than the four-conductor system. In addition, spacers are not used for single-conductor overhead transmission lines, but the present invention can also be used for removing a difficult snow ring attached to a single-conductor overhead transmission line. it can.

DESCRIPTION OF SYMBOLS 1 Fall prevention net apparatus for multiconductor hoist 2 Multiconductor hoist 2a Connecting part 3 Lower frame 3a Left lower frame 3b Right lower frame 3c, 3d, 3e, 3f Connecting member 4 Upper frame 4a Left upper frame 4b Right upper part Frame 4c, 4d, 4e Connecting member 5 Lower net 6 Upper net 6a Left upper net 6b Right upper net 7 Conductor passing openings 8a, 8b Secured opening 9a, 9b, 10a, 10b Twist hook part 11a Front opening / closing part 11b Rear opening / closing part 20 Bottom net 21 Left side lower net 22 Right side lower net 30a Left side top net 30b Left side upper net 30c Right side top net 30d Right side upper net A Moving pulley part A1, A2 Pulley B Pedestal part C 4 conductors Overhead power transmission line C1, C2, C3, C4 Conductor H Worker

Claims (3)

Removably attached to a multiconductor hoist for power transmission work that is suspended from a multiconductor overhead power transmission line and configured to collect falling objects that fall due to the work of the multiconductor overhead power transmission line An anti-fall net device for a multiconductor air hoist,
A lower frame provided around a lower portion of the multiconductor hoist;
An upper frame connected to the lower frame and provided around the upper portion of the multiconductor hoist;
A lower net covering the lower frame;
An upper net covering the upper frame,
A conductor passage opening formed so that each conductor constituting the multi-conductor overhead power transmission line can pass through the front part and the rear part of the upper net, and a member attached to the overhead power transmission line can pass therethrough. A formed opening / closing part is provided,
An anti-fall net device for a multi-conductor hoist, wherein all directions of front, rear, left, right, upper, and lower sides of the multi-conductor hoist are surrounded by the lower and upper nets. The upper net is composed of a left upper net and a right upper net having the same shape,
The fall prevention net device for a multiconductor hoist according to claim 1, wherein the left upper net and the right upper net are detachably connected. The multi-conductor hoist is provided with a moving pulley placed on the multi-conductor overhead power transmission line, and a pedestal installed below the moving pulley.
3. The fall prevention net device for a multiconductor hoist according to claim 1, wherein the member mounted on the overhead power transmission line is a span spacer.