JP2014241688A - Scaffold for work - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily or safely extend a distance in a vertical direction between a scaffold for work and a wire or an electric facility.SOLUTION: A support device 7 which supports a wiring ladder 1 as a scaffold for work on a wire or the like above the wiring ladder is provided in a distal end portion of the wiring ladder 1. The support device 7 comprises a belt 11 in which a hook 12 is connected to one end portion, and a takeup device 14 for taking up the belt 11. The takeup device 14 is attached at a distal end side of a pipe-shaped support member 13 connected to a ladder body 6. A worker operates the takeup device 14 while getting on the ladder body 6, and by feeding out the belt 11, a distance in a vertical direction between a wire 4 and the wiring ladder 1 can be extended. The worker takes up the belt 11 by the takeup device 14, such that the distance in the vertical direction between the wire 4 and the wiring ladder 1 can be reduced.

Description

  The present invention relates to a work scaffold that can be used, for example, when performing work related to power transmission and distribution equipment at a high place.

  For example, when performing work related to power transmission and distribution equipment, such as work to fix the electric wire with an overhead wire clamp provided at the tip of the insulator supported by the steel tower, work to connect the electric wires supported respectively to the steel tower by a jumper device, The worker uses a work scaffold such as an overhead ladder. Specifically, the worker installs the overhead ladder so that it extends substantially horizontally from the steel tower along the electric wire, moves on the overhead ladder to a position slightly away from the steel tower, and at that position, the above-mentioned Do work.

  More specifically, as shown in FIG. 6, the operator connects the base end portion of the ladder main body 101 of the overhead ladder 100 to the pillar portion 103 of the tower by the rope 102, and connects the distal end portion of the ladder main body 101 to the rope 104. To the wire 105. Then, the worker rides on the ladder body 101 and performs, for example, an operation of compressing and connecting the connection end portion 105A of the electric wire 105 and the end portion (not shown) of the jumper wire of the jumper device. In addition, 110 in FIG. 6 is an insulator device, 111 is a lightning arrester.

  In Patent Document 1 below, an example of an overhead ladder is described.

JP 2008-18295 A

  Meanwhile, as shown in FIG. 7, the conventional overhead ladder 100 is provided with a hook 107 at the tip of the ladder main body 101, and the hook 107 is hooked on the electric wire 105 to support the tip of the ladder main body 101 on the electric wire 105. can do.

  The hook 107 is connected to the distal end portion of the ladder main body 101 via a short rod-like support member 108 whose length cannot be changed. For this reason, as long as the hook 107 is directly hooked on the electric wire 105 and used, the vertical distance between the electric wire 105 and the ladder main body 101 is determined by the length of the support member 108 and cannot be extended.

  However, there are various arrangements of electric wires and electric facilities in the steel tower, and depending on the work site, the shorter the distance in the vertical direction between the electric wires 105 and the ladder main body 101, the better the workability may be. In some cases, workability is improved.

  For example, in the example shown in FIG. 7, since the vertical distance between the electric wire 105 and the tip of the ladder main body 101 is short, the connection end portion 105 </ b> A where the electric wire 105 hangs down is positioned below the ladder main body 101. In this state, the operator must work while lifting the connection end 105A of the electric wire 105, and workability is poor. In such a case, it is desirable to increase the vertical distance between the electric wire 105 and the ladder body 101. Then, the connection end portion 105A of the electric wire 105 is positioned between the ladder main body 101 and the electric wire 105, and the height position of the connection end portion 105A is close to the operator working on the ladder main body 101. Since it is almost the same as the height position, the operator can work without lifting the connection end 105A, and the workability is improved.

  Conventionally, in order to increase the vertical distance between the electric wire 105 and the ladder main body 101, as shown in FIG. 6, a method of interposing a rope 104 between the electric wire 105 and the hook 107 has been adopted. However, this method has a problem that it is difficult to perform an operation of connecting the electric wire 105 and the hook 107 with the rope 104.

  That is, the operation of connecting the wire 105 and the hook 107 with the rope 104 is as follows. First, the worker connects the base end side of the ladder main body 101 to the pillar portion 103 of the tower with the rope 102 and hangs the hook 107 on the electric wire 105. Subsequently, the operator gets on the ladder main body 101 and moves on the ladder main body 101 toward the distal end side of the ladder main body 101 until reaching a position where the hand can reach the hook 107. Subsequently, the operator ties one end side of the rope 104 to the hook 107 that is hung on the electric wire 105. Subsequently, the operator hangs on the electric wire 105 while supporting the front end side of the ladder body 101 with his hand so that his / her weight is not applied to the ladder body 101. In this state, the operator removes the hook 107 from the electric wire 105 and lowers the tip of the ladder body 101 while feeding the rope 104 tied to the hook 107. When the distance in the vertical direction between the electric wire 105 and the ladder main body 101 becomes an appropriate distance, the operator stops feeding the rope 104 and ties the other end of the rope 104 to the electric wire 105. Then, the worker who is hanging on the electric wire transfers from the electric wire 105 to the ladder main body 101.

  In such an operation of connecting the electric wire 105 and the hook 107 with the rope 104, the operation of hanging on the electric wire 105 while supporting the ladder main body 101 with a hand is difficult unless it is an experienced worker with abundant experience.

  In addition, after the electric wire 105 and the hook 107 are connected by the rope 104 and the distance in the vertical direction between the electric wire 105 and the ladder body 101 is once set, it is difficult to change the distance.

  In addition, although the substantial length (effective length of an overhead line ladder) of the horizontal direction of an overhead line ladder can be extended in the overhead line ladder described in the said patent document 1, the vertical direction between an overhead line ladder and an electric wire is sufficient. The distance cannot be extended.

  The present invention has been made in view of the above-described problems, for example, and an object of the present invention is to provide a working scaffold that can easily or safely extend or shrink a distance in the vertical direction from an electric wire or electrical equipment. It is to provide.

  In order to solve the above-mentioned problems, a first working scaffold according to the present invention is a longitudinal plate-like or ladder-like scaffold main body, and an electric wire or electrical equipment located above the scaffold main body in the length direction of the scaffold main body. A support device capable of supporting one end portion and changing a vertical distance between the one end portion of the scaffold main body and the electric wire or the electrical equipment, and the support device has a long string shape. Alternatively, a long member formed in a belt shape, a connecting portion that removably connects a distal end side of the long member to the electric wire or electrical equipment, and a proximal end side of the long member is the one end of the scaffold body. A winding that can be connected to a portion and can change a distance at which the connecting portion can be separated from the one end portion of the scaffold body by extending or winding the elongated member in accordance with a user operation. With equipment And wherein the Rukoto.

  Further, the second work scaffold of the present invention is the above-described first work scaffold of the present invention, wherein the proximal end side is connected to the one end portion of the scaffold main body, and the distal end side is connected to the one end portion of the scaffold main body. It is provided with a bar-like or plate-like support member extending in the direction of leaving, and the winding device is attached to the distal end side of the support member, and is arranged at a location away from the one end of the scaffold body. To do.

  Further, the third working scaffold of the present invention is the above-described second working scaffold of the present invention, wherein the connecting portion or the distal end portion of the supporting member includes the connecting portion and the distal end portion of the supporting member. It is characterized in that a fixing mechanism capable of directly connecting and fixing is provided.

  The fourth work scaffold according to the present invention is the above-described work scaffold according to any one of the first to third aspects of the present invention described above, wherein the winding device is configured to feed the long member and the long member. An operation handle is provided for selectively performing an operation of winding the roll.

  The fifth working scaffold according to the present invention is the above-described working scaffold according to any one of the first to fourth aspects of the present invention, wherein the winding device has a distal end side of the long member separated from the winding device. It is provided with a ratchet mechanism for restricting the pulling out.

  ADVANTAGE OF THE INVENTION According to this invention, the distance in the vertical direction between a working scaffold and an electric wire or an electrical installation can be extended or shortened easily or safely. Therefore, good workability can be ensured according to the work site.

It is a perspective view which shows the overhead ladder etc. which are embodiment of the scaffold for work of this invention. It is explanatory drawing which shows the support apparatus of the overhead ladder which is embodiment of the scaffold for work of this invention. It is explanatory drawing which shows the state by which the belt was extended | stretched long in the support apparatus of the overhead ladder which is embodiment of the scaffold for work of this invention. It is explanatory drawing which shows the winding apparatus etc. of the overhead ladder which are embodiment of the scaffold for work of this invention. It is explanatory drawing which shows the state by which the hook was fixed to the support member in the overhead wire ladder which is embodiment of the scaffold for work of this invention. FIG. 6 is a perspective view showing a state in which a hook and an electric wire are connected via a rope in an overhead ladder according to a conventional technique. FIG. 6 is a perspective view showing a state in which hooks and electric wires are directly connected in an overhead ladder according to a conventional technique.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an overhead ladder as a working scaffold according to an embodiment of the present invention. In FIG. 1, the overhead ladder 1 can be used as a scaffold for performing work related to power transmission and distribution equipment at a high place. For example, the overhead wire ladder 1 is used as a scaffold for performing an operation of connecting a jumper wire (not shown) of a jumper device to a connection end portion 4A of an electric wire 4 connected to a pillar portion 2 of a steel tower via an insulator device 3. be able to. A lightning arrester 5 is attached to the insulator device 3.

  The overhead ladder 1 includes a ladder main body 6 as a scaffold main body, and a support device 7 that supports a tip portion (one end portion in the length direction) of the ladder main body 6 on an electric wire or an electrical facility located above the overhead ladder 1. ing. Further, the support device 7 has a function of changing a vertical distance between the tip of the ladder body 6 and the electric wire or the electrical equipment. In the present embodiment, the support device 7 supports the distal end portion of the ladder main body 6 on the electric wire 4 located above the ladder main body 6 and changes the vertical distance D between the distal end portion of the ladder main body 6 and the electric wire 4. Can be made. In addition, the length of the ladder body 6 in the present embodiment is, for example, about 4 meters to 5 meters, but the length of the ladder body 6 may be less than 4 meters or may be longer than 5 meters.

  2 to 5 show the support device 7. As shown in FIG. 2 or FIG. 3, the support device 7 has a belt 11 as an elongated member, a hook 12 as a connecting portion that removably connects the distal end side of the belt 11 to an electric wire or electrical equipment, and a proximal end side. A rod-like or tubular support member 13 connected to the distal end portion of the ladder body 6 and extending in a direction away from the distal end portion of the ladder body 6, and attached to the distal end side of the support member 13, the base end side of the belt 11 is A winding device 14 is provided that is connected to the ladder main body 6 side and that feeds or winds the belt 11 according to the operation of the operator.

  The belt 11 has a length of, for example, about 5 meters, is wide, and is formed of a material having excellent tensile strength and durability, such as a nylon material. The length of the belt 11 may be less than 5 meters or may be longer than 5 meters, and the material of the belt 11 may be another material excellent in tensile strength and durability. For example, a belt used for a cargo clamping machine can be used as the belt 11. Moreover, it can replace with the belt 11 as a long member, and can also use a rope or a wire.

  The hook 12 and the belt 11 are connected to each other via a connecting member 15. Specifically, the distal end portion of the belt 11 is fixed to the proximal end side of the connecting member 15. It is desirable to fix the front end of the belt 11 to the outer peripheral side of the connecting member 15. If the overhead ladder 1 is used repeatedly, the belt 11 may be damaged. However, if the tip of the belt 11 is fixed to the outer peripheral side of the connecting member 15, the operator may damage the belt 11. It can be easily confirmed by eye whether or not there is any.

  Further, the proximal end side of the hook 12 is attached to the distal end side of the connecting member 15 so as to be rotatable in the direction of arrow A in FIG. The hook 12 is formed in a bowl shape with a metal material covered with a resin, for example, and has a strength that does not deform even when a large load is applied downward.

  The hook 12 and the connecting member 15 are provided with link-like locking portions 16 and 17, respectively. After the hook 12 is hung on the electric wire or the electric equipment, it is possible to prevent the hook 12 from coming off from the electric wire or the electric equipment by connecting a rope or the like between the locking portions 16 and 17.

  The support member 13 is a pipe-shaped member having a rectangular cross section formed of, for example, a metal material. The base end side of the support member 13 is connected to the distal end portion of the ladder body 6 via the connecting member 18 so as to be rotatable in the direction indicated by the arrow B in FIG. The length of the support member 13 is desirably 70 centimeters or more and 120 centimeters or less, for example.

  As shown in FIG. 2, the winding device 14 includes a drum portion 21 that winds the belt 11, a drum support portion 22 that rotatably supports the drum portion 21 on the distal end side of the support member 13, and the drum portion 21. A rotation restricting mechanism 23 for restricting the rotation and an operation handle 24 for an operator to operate the feeding and winding of the belt 11 are provided.

  Here, FIG. 4 schematically shows a state in which the belt 11 is wound around the drum portion 21 of the winding device 14. As shown in FIG. 4, the base end portion of the belt 11 is fixed to the winding shaft of the drum portion 21, and the belt 11 is wound around the drum portion 21 starting from that portion. Further, a hole is formed in a portion where the winding device 14 is attached on the distal end side of the support member 13, and a part of the outer peripheral side of the drum portion 21 is placed inside the support member 13 through the hole. I'm submerged. Further, the tip end side of the belt 11 enters the inside of the support member 13 from the portion where the drum portion 21 has entered the inside of the support member 13, and is supported from the tip end of the support member 13 through the inside of the pipe-like support member 13. It extends to the outside of the member 13.

  The rotation restricting mechanism 23 includes two sets of ratchet mechanisms, and the drum portion 21 and the operation handle 24 are switchably connected to one of the two sets of ratchet mechanisms of the rotation restricting mechanism 23.

  In the rotation restricting mechanism 23, the first ratchet mechanism allows rotation of the drum portion 21 in the winding direction (clockwise direction in FIG. 4) and prevents rotation in the feeding direction (counterclockwise direction in FIG. 4). . When the operation handle 24 is at the position P1 in FIG. 4 or when the operation handle 24 rotates between the positions P1 and P2, the drum portion 21 and the operation handle 24 are connected to the first ratchet mechanism. When the operation handle 24 is tilted from the position P1 toward the position P2, the first ratchet mechanism rotates the drum portion 21 in the winding direction in accordance with the operation of the operation handle 24. On the other hand, when the operation handle 24 is returned from the position P2 to the position P1, the first ratchet mechanism permits the operation of the operation handle 24 but prevents the drum portion 21 from rotating in the feeding direction. The operator can wind the belt 11 around the drum portion 21 by repeating the operation of tilting the operation handle 24 from the position P1 to the position P2 and the operation of returning the operation handle 24 from the position P2 to the position P1.

  Further, in the rotation restricting mechanism 23, the second ratchet mechanism allows the drum portion 21 to rotate in the feeding direction and prevents rotation in the winding direction. When the operation handle 24 is moved from the position P1 to the position P3 in FIG. 4, the ratchet mechanism connected to the drum portion 21 and the operation handle 24 is switched from the first ratchet mechanism to the second ratchet mechanism. The second ratchet mechanism has a spring that biases the drum portion 21 in the winding direction. When the operation handle 24 is tilted from the position P3 to the position P4, the second ratchet mechanism resists the urging force of the spring and rotates the drum portion 21 in the feeding direction with the operation of the operation handle 24. On the other hand, when the operation handle 24 is returned from the position P4 to the position P3, the second ratchet mechanism permits the operation of the operation handle 24 but prevents the drum portion 21 from rotating in the winding direction. The operator can pay out the belt 11 from the drum unit 21 by repeating the operation of tilting the operation handle 24 from the position P3 to the position P4 and the operation of returning the operation handle 24 from the position P4 to the position P3.

  Further, when the operator pulls out the belt 11 from the drum portion 21 in this way, the drum portion 21 is urged in the winding direction by the spring of the second ratchet mechanism. Thereby, it is possible to prevent the belt 11 from being fed out from the drum portion 21 at a high speed due to a load applied to the ladder body 6 when an operator rides on the ladder body 6.

  When the feeding of the belt 11 is completed, the operator returns the operation handle 24 from the position P3 to the position P1. As a result, the ratchet mechanism connected to the drum portion 21 and the operation handle 24 is switched from the second ratchet mechanism to the first ratchet mechanism.

  Further, the mounting position of the winding device 14 on the support member 13 is such that when the support member 13 is raised perpendicularly to the length direction of the ladder body 6, as shown in FIG. The distance C between the winding device 14 and the winding device 14 is set to be approximately 60 centimeters or more and 1 meter or less, for example. As a result, the winding device 14 is disposed at a location 60 cm to 1 meter away from the tip of the ladder body 6, that is, at a location that can be easily reached by an operator who works on the ladder body 6. . Therefore, the operator can easily change the vertical distance between the electric wire 4 and the ladder body 6 by operating the winding device 14 while working.

  Further, the overhead ladder 1 has a fixing mechanism for directly connecting and fixing the hook 12 and the support member 13 as shown in FIG. The fixing mechanism includes a locking hole 25 (see FIG. 2) formed on the base end side of the connecting member 15 to which the hook 12 is connected, and a butterfly screw 26 as a fixing member attached to the distal end side of the support member 13. It has. The operator inserts the base end side of the connecting member 15 connected to the hook 12 from the front end of the support member 13 into the inside thereof. Then, the position of the thumbscrew 26 and the position of the locking hole 25 coincide. The operator can insert the tip of the thumbscrew 26 into the locking hole 25 by tightening the thumbscrew 26. The hook 12 is fixed to the support member 13 by inserting the tip of the thumbscrew 26 into the locking hole 25.

  When working on the power transmission / distribution facility, first, the worker carries the overhead ladder 1 to the work site above the steel tower. At this time, the belt 11 of the overhead wire ladder 1 is completely wound around the drum portion 21, and the hook 12 is fixed to the support member 13 with a thumbscrew 26. After carrying the overhead ladder 1 to the work site, the operator loosens the thumbscrew 26 and removes the tip of the thumbscrew 26 from the locking hole 25. Subsequently, the operator connects the base end side of the ladder main body 6 to the column portion 2 of the tower with the rope 8 and hangs the hook 12 on the electric wire 4. Subsequently, the operator gets on the ladder body 6, moves to the tip side of the ladder body 6, and connects a rope between the locking portions 16 and 17. Subsequently, the operator moves the operation handle 24 of the winding device 14 from the position P1 to the position P3. Subsequently, the operator repeats the operation of tilting the operation handle 24 from the position P3 to the position P4 and the operation of returning the operation handle 24 from the position P4 to the position P3. A vertical distance between 6 and 6 is set. By extending the belt 11, the distance at which the hook 12 can be pulled away from the tip of the ladder body 6 is increased, and as a result, the vertical distance between the electric wire 4 and the ladder body 6 is increased. The operator can extend the belt 11 while keeping it on the ladder body 6 and lightly extend his hand to grab the operation handle 24, and reciprocate the operation handle 24 between the positions P3 and P4. The vertical distance between 4 and the ladder body 6 can be increased. After the setting of the vertical distance between the electric wire 4 and the ladder body 6 is completed, the operator returns the operation handle 24 from the position P3 to the position P1. Thereby, the rotation of the drum portion 21 in the feeding direction is blocked by the first ratchet mechanism, and the belt 11 can be pulled out from the drum portion 21 even when a large force is applied in the direction of separating the hook 12 and the ladder body 6. Is prevented.

  Further, after the belt 11 is drawn out from the drum portion 21 in this way and the vertical distance between the electric wire 4 and the ladder body 6 is set, when the operator wants to shorten the distance, the operator gets on the ladder body 6. In this state, the hand 11 is lightly extended to grasp the operation handle 24, and the operation of tilting the operation handle 24 from the position P1 to the position P2 and the operation of returning the operation handle 24 from the position P2 to the position P1 are repeated. Take up around.

  On the other hand, when there is no need to increase the vertical distance between the electric wire 4 and the ladder body 6, the hook 12 is hung on the electric wire 4 while the hook 12 is fixed to the support member 13 with the thumbscrew 26. May be.

  As described above, according to the overhead ladder 1 according to the embodiment of the present invention, an operator can easily reach the ladder body 6 and lightly extend his hand to grasp the operation handle 24 and operate the operation handle 24. The distance in the vertical direction between the electric wire 4 and the ladder main body 6 can be easily extended or reduced, thereby realizing good workability. Moreover, unlike the conventional overhead wire ladder, it is not necessary to hang the rope by hanging the wire while supporting the overhead wire ladder by hand, so that the safety of the operation can be improved.

  Further, by providing the operation handle 24, the operator can easily wind and unwind the belt 11. Further, the two sets of ratchet mechanisms of the winding device 14 can prevent the belt 11 from being pulled out of the drum portion 21 due to the load applied to the ladder body 6, and a large vibration is generated in the ladder body 6. Can be prevented, and the safety of work can be ensured. Further, by providing a fixing mechanism for fixing the hook 12 to the support member 13, the hook 12 can be firmly fixed to the support member 13. For example, when a heavy apparatus is placed on the ladder body 6, When working inside, the ladder main body 6 can be firmly supported below the electric wire or electrical equipment to ensure the safety of the work.

  Note that the work scaffold of the present invention is not limited to the overhead ladder 1 described above. For example, a long plate-like scaffold body can be used in place of the ladder body 6. Further, the hook 12 can be hung not on the electric wire but on the electric equipment. Further, as the connection portion, a calbiner or a shackle can be used instead of the hook 12. Further, an electric winding device may be used, and the winding or feeding of the belt 11 may be operated by a push button or a knob.

  In the above-described embodiment, the belt 11 is connected to the hook 12 side through the inside of the support member 13. However, the belt 11 may be connected to the hook 12 side by extending the outside of the support member 13. Good. The shape of the support member 13 may be a plate shape. Further, the length of the support member 13 may be less than 70 centimeters or may be longer than 120 centimeters. In addition, the attachment position of the winding device 14 may be less than 60 centimeters or more than 1 meter from the tip of the ladder body 6 as long as it is within the reach of the operator.

  The overhead ladder 1 is not limited to work related to power transmission / distribution equipment, but can be used for various work such as equipment installation work, repair work, painting work, monitoring work, rescue work performed at high places or places where it cannot stand safely. Can be used.

  Further, the present invention can be appropriately changed without departing from the spirit or idea of the invention that can be read from the claims and the entire specification, and the working scaffold accompanied by such change is also the technical idea of the present invention. include.

DESCRIPTION OF SYMBOLS 1 Overhead ladder 2 Pillar part 3 Insulator device 4 Electric wire 5 Lightning arrester 6 Ladder main body 7 Support apparatus 8 Rope 11 Belt (long member)
12 Hook (connection part)
DESCRIPTION OF SYMBOLS 13 Support member 14 Winding device 15 Connection member 16, 17 Locking part 18 Connection member 21 Drum part 22 Drum support part 23 Rotation restriction mechanism (ratchet mechanism)
24 Operation handle 25 Locking hole (fixing mechanism)
26 Thumbscrew (Fixing mechanism)

Claims (5)

A long plate-like or ladder-like scaffold body,
The one end in the length direction of the scaffold body is supported by the electric wire or electrical equipment located above the scaffold body, and the vertical distance between the one end of the scaffold body and the electrical wire or electrical equipment is changed. And a support device that can be made to
The support device is
A long member formed into a long string or belt, and
A connecting portion for detachably connecting the distal end side of the elongate member to the electric wire or electrical equipment;
The proximal end side of the long member is connected to the one end portion of the scaffold body, and the connection portion is connected to the one end portion of the scaffold body by paying out or winding the elongated member according to a user operation. A working scaffold comprising: a winding device capable of changing a distance that can be separated from the work. A proximal end is connected to the one end of the scaffold body, and a distal end is provided with a rod-like or plate-like support member extending in a direction away from the one end of the scaffold body,
2. The work scaffold according to claim 1, wherein the winding device is attached to a distal end side of the support member and is disposed at a position away from the one end of the scaffold body.   3. The fixing mechanism capable of directly connecting and fixing the connection portion and the tip end portion of the support member is provided at the connection portion or the tip end portion of the support member. The working scaffold described.   4. The winding device according to claim 1, further comprising an operation handle for selectively performing an operation of feeding out the long member and an operation of winding up the long member. The working scaffold described.   5. The work scaffold according to claim 1, wherein the winding device includes a ratchet mechanism that restricts the distal end side of the long member from being pulled out from the winding device.

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