JPH07197644A - Drawgear for elevating and lowering operator and extending method thereof - Google Patents

Abstract

PURPOSE:To obtain a drawgear, which draws an operator so as to assist the lifting and lowering of a ladder while preventing falling, has small-sized simple structure and is used for elevating and lowering the operator. CONSTITUTION:A frame T is mounted so as to face a shaft for a transmission- line steel tower. A ladder 1 is installed along the inwall of the shaft from the frame T. The ladder 1 is fixed through a guide fitting 4 and a bearing fitting 5. A traction guide 6 is set up at the central section of the ladder 1 in the direction of extension. A chain is fixed and constituted between a base plate and a stop plate in the traction guide 6. A drawgear 10 is mounted on the traction guide 6 so as to be able to be moved. The drawgear 10 has a sprocket engaged with the chain of the traction guide 6 and a motor, and the sprokcet is rotated and the drawgear is moved. A traction belt 26 is connected to the drawgear 10 through a load detector, and an operator is coupled. The load detector operates a limit switch in response to load, and changes over the revolution, stoppage and emergency stop of the motor 16.

Description

Detailed Description of the Invention

[0001]

[Industrial field of application] During the foundation work for the deep foundation of a power transmission line tower, a ladder is set up to enter and leave a shaft dug deep in the ground. The present invention relates to a traction device and a method of extending a traction path for assisting the vehicle and avoiding a fall.

[0002]

2. Description of the Related Art Conventionally, a ladder provided on an inner wall surface is used to get in and out of a vertical shaft. Also, there is a method in which a guide rail is fixed to an inner wall surface and an elevator is attached to the guide rail to move the guide rail up and down. Further related technology is a fall prevention device for lifting a steel tower (Japanese Patent Publication No. 58-58105).
issue). This device is provided with guide rails vertically provided on the side of a step bolt provided on the side of a steel tower, and a movable safety device is attached to the guide rails. The safety device is connected to a safety belt that connects with the worker, and the built-in sprocket meshes with the meshing hole of the guide rail and moves with the worker. Then, if the worker is about to fall due to a step or the like, the safety device stops on the guide rail to avoid danger.

[0003]

In the case of using a ladder among the above-mentioned conventional ones, as the vertical shaft becomes deeper as the work progresses, the labor required for going up and down increases, and the risk of falling increases. Installing an elevator requires large-scale installation work, is uneconomical, takes time, and hinders excavation work by machines. In the fall prevention device for raising and lowering a steel tower, the danger of falling can be avoided, but there is a problem that the labor of the operator himself to climb and descend is not reduced. Therefore, the present invention is a towing device for raising and lowering a worker and a towing device for raising and lowering the worker, which has a small size and a simple structure that prevents the operator from falling and prevents the worker from falling and does not hinder excavation work. It is an object of the present invention to provide a method of extending the tow path of a car.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a ladder 1 for vertically moving a worker provided along a wall surface of a vertical shaft and a center portion of step 3 of the ladder 1. A towing guide 6 fixed vertically along the ladder 1, and a towing machine 1 that moves on the towing guide 6 and moves up and down together with an operator.
0, and the traction guide 6 vertically extends a chain 8 on a base plate 7 that is fixed to the step 3 of the ladder 1, and fixes the chain 8 together with a stop plate 9 with a connecting pin 9a.
The motor 0 drives the sprocket 13 that meshes with the chain 8 by means of the motor 16, and is provided between the base plate and the stop plate, and is provided with the guide roller 12 that prevents the traction guide 6 from being disengaged. The load detection device 19 for detecting the load applied to the motor 16 is provided. The drive / stop of the motor 16 is switched according to the load.
A connecting tool for connecting the worker and the towing machine 10 was connected to the above to construct a worker lifting / lowering device.

Further, the vertical rod 2 of the ladder 1 is provided with a guide groove in the longitudinal direction, and the guide metal member 4 having a guide roller 4c capable of rolling the guide groove of the vertical rod 2 on the wall surface of the shaft and the gantry T.
Are provided at intervals.

Further, the mounting piece 5b of the gantry T is arranged so as to fall to the outside of the gantry T and rise up along the gantry T.
The support metal piece 5 is rotatably supported on the support metal piece 5, and the support metal piece 5 is provided with a concave portion 5c for receiving the step 3 of the ladder 1, and is provided with an abutting edge for preventing downward rotation in a fall state.

Then, the ladder 1 is used to extend the traction device.
The lower part of the ladder is hung by the wire W wound by the winch Wi, the ladder material is connected to the upper part of the existing ladder 1, and then the vertical rod 2 of the ladder 1 is guided by the guide roller 4c attached to the vertical shaft during its extension. It is decided to hang it down with the winch Wi while fixing it and fix it with the support fitting 5 at a predetermined position.

[0008]

The traction device for raising and lowering a worker according to the present invention comprises a traction machine 10.
Is attached to the tow guide 6, and the connecting tool 26 is attached to the operator and moved up and down. The towing machine 10 moves as the motor-driven sprocket 13 rotates while biting the chain 8. At this time, since the guide roller 12 is positioned by the base plate 7 and the stopper plate 9, the traction machine 10
Moves without separating from the tow guide 6. The operator only needs to leave his / her weight on the towing machine 10 to proceed with his / her walk, and can easily move up and down without supporting his own weight. Tractor 10
The operating state of is properly changed according to the load by the load detecting device 19 detecting the load applied thereto. That is, in a normal state in which a worker deposits a part of his / her weight on the towing machine 10 and climbs up and down the ladder 1, the towing machine 10 moves at a constant speed. However, when a large deviation occurs in the moving speed between the operator and the towing machine 10, the load applied to the towing machine 10 changes, so the load detection device 19 detects this state, and the motor 16 is stopped to move the towing machine 10. stop. Therefore, if the worker is in danger of falling, the towing machine 10 stops to avoid this.

When the ladder 1 is extended according to the progress of the construction, a ladder material is connected to the upper part of the existing ladder 1 and the wire W connected to the lower part of the ladder 1 is hung from above by the winch Wi. . At this time, the vertical rods 2, 2 of the ladder 1 are guided by the guide rollers 4c of the guide fitting 4, so that they are arranged at predetermined positions. After the arrangement, the ladder 1 is fixed by, for example, the support fitting 5.

When the ladder 1 is hung down, the support fitting 5 does not prevent the step 3 from descending if the rotating piece 5b is erected upward along the pedestal T. On the other hand, when supporting the ladder 1, the turning piece 5b is tumbled to the outside of the pedestal 1 below the step 3, and the step 3 is lowered into the recess 5c to support the ladder 1. Since the rotating piece 5b is prevented from rotating downward by the abutting edge in the fall state, the rotating piece 5b reliably supports the ladder 1.

[0011]

Embodiments of the present invention will be described with reference to the drawings.
In this embodiment, the traction device is applied to a shaft dug deep underground in the deep foundation work of a transmission line tower. 1 to 4, a pedestal T is provided at the edge of the vertical shaft so as to face the vertical shaft.
Is provided. Reference numeral 1 is a ladder provided along the inner wall of the vertical shaft from the mount T. As shown in FIG. 4, the vertical rod 2 of the ladder 1 has a substantially C-shaped cross section open to the outside.

As shown in FIGS. 4 and 5, a liner plate L is stretched on the inner wall of the vertical shaft. Ladder 1
The frame T and the liner plate L are fixed by the guide fittings 4 attached to the flange L1. Guide fitting 4
Has a substantially U-shaped frame 4a conforming to the width of the ladder 1, clamp portions 4b on both sides of the back portion, and guide wheels 4c rotatably supported inside both end portions. Clamp part 4b is screw 4
Tighten d and clamp the flange L1 between it and the lower jaw. The guide roller 4c is fitted into the vertical rod 2 and is prevented from coming off, and is relatively movable in the vertical rod 2 in the longitudinal direction.

At the lower end of the ladder 1, as shown in FIG.
The wire W is connected through the connecting fitting 1a. The wire W is wound by the winch Wi provided on the upper part of the gantry T, and the ladder 1 can be raised and lowered. Also, ladder 1
Are supported on the gantry T by the support fittings 5. The support fitting 5 is
As shown in FIG. 6, the mounting piece 5 protruding laterally from the gantry T
It has a and a rotating piece 5b rotatably attached thereto. The middle portion of the rotating piece 5b is pivotally supported by the mounting piece 5a, but one end edge of the rotating piece 5b is in contact with the pedestal 1, so the rotating range is limited to approximately 90 ° from horizontal to vertical. A recess 5c for receiving the step 3 is provided on the edge of the rotating piece 5b.

At the center of the ladder 1, a traction guide 6 is provided in the extension direction. As shown in FIGS. 7 and 8, the traction guide 6 has a base plate 7 made of a long plate having a substantially U-shaped cross section, the facing surface of which is fixed to the step 2 of the ladder 1. A through hole 7a through which the step 3 penetrates is formed on the opposite surface of the base plate 7.
Have. A chain 8 and a stopper plate 9 are fixed to the upper portion of the base plate 7 by screws 9a. The chain 8 extends along the base plate 7, and a screw 9a is inserted into the tubular connecting pin 8a of the chain 8 to fasten the stopper plate 9 together with the base plate 7.

A towing machine 10 is attached to the towing guide 6 so as to be vertically movable. The towing machine 10 is shown in FIGS.
As shown in, the guide rollers 12, 12 are rotatably supported by the lower middle portion in the front and rear of the bottom portion 11a of the box body 11. The guide rollers 12 and 12 are located between the base plate 7 and the stop plate 9 of the traction guide 5 so that the chain 8 is sandwiched therebetween. A sprocket 13, a push roller 14, and a speed reducer 15 are provided on the front side inside the box 11.
Further, on the rear side, a motor 16 and a current control inverter 1 are provided.
7, a sequencer 18, and a load detection device 19 are provided.
The sprocket 13 moves the towing machine 10 by being engaged with the chain 8 and rotating. The push roller 14 faces the sprocket 13 so as to sandwich the chain 8 and prevents the sprocket 13 from being separated from the chain 8. The shaft of the sprocket 13 is connected to a motor 16 via a speed reducer 15 and is rotationally driven by the motor 16. The rotation direction of the motor 16 is switched by the elevating switch 20. A power cable 21 is externally connected to the motor 16. The power cable 21 is wound around a reel R provided on the pedestal T.

As shown in FIG. 13, the load detecting device 19 includes a spring 23 housed in a spring housing 22 in a compressible manner.
Is equipped with. One end of the spring 23 is locked to one inner end of the spring housing 22, and the other end is locked to the movable bar 25. The movable bar 25 is movable in and out of the spring housing 22 in the expansion and contraction direction of the spring 23. Movable bar 2
An actuating arm 24, which is movable in the longitudinal direction together with the movable bar 25, is fixed to the locking portion of the spring 23 in FIG. The actuating arm 24 projects laterally from the spring container 22. A traction belt 26 is connected to the outer end of the movable bar 25. The tow belt 26 is fastened to a safety belt 27 worn by the worker. Limit switches LS1, LS2, L are provided on the sides of the spring housing 22 in the longitudinal direction.
S3 faces. Limit switches LS1, LS2, LS3 are
Actuating arm 2 displaced by compression of spring 23 due to load
Turns on and off by 4. That is, the load detection device 19
When the load is not applied, the motor 16 is stopped because the operating arm 24 turns off the limit switch LS1 as shown in FIG. 13 (A). Load (5kg
When the spring 23 is compressed by (f to 50 kgf), the limit switch LS1 is turned on to rotate the motor 16. If further load is applied, limit switch L
S2 is turned off and the motor 16 is stopped. When the overload is suddenly applied, the limit switch LS3 is turned off to stop the motor 16 in an emergency. In this way, the limit switches LS1, LS2, LS3 rotate the motor 16,
Switch between stop and emergency stop.

The towing machine 10 has an automatic operation switch 28, and can operate the motor 16 at a constant speed for unmanned operation. Bumpers 29, 3 are provided at the front and rear ends of the box body 11.
0 is provided. The support portions of the bumpers 29, 30 have an upper limit switch 31 and a lower limit switch 32 for sensing contact with the stoppers 6a, 6b provided at the upper and lower ends of the traction guide 6 during automatic operation. A hook 33 is provided on the top of the box 11. Since the operator's hand is blocked on the hook 33 during lifting and lowering, tools and other hand-held objects can be hung, and during automatic operation, the traction belt 26 swings and catches on a fixed object to prevent the traction machine 10 from traveling. You can hang it to prevent it.

In the towing apparatus of this embodiment, the towing machine 10 is attached to the towing guide 6 and the safety belt 2 attached to the worker is provided.
The traction belt 26 is fastened to 7 and operated. Tractor 10
Puts the up / down switch 28 in “up” or “down” to apply a tension of 5 kgf or more to the traction belt 26,
The load detection device 19 detects this and rotates the motor 16. The sprocket 13 is rotated by the motor 16 while biting the chain 8, and the traction machine 10 advances at a constant speed. At this time, since the guide rollers 12 and 12 are between the stopper plate 9 and the base plate 7 and the pressing roller 14 sandwiches the chain 8 together with the sprocket 13, the traction machine 1
0 does not separate from the tow guide 6. In the load detection device 19, the spring 22 is compressed by the load,
When the operating arm 24 is displaced, the limit switches LS1, LS2, LS3 are turned on and off to drive and stop the motor 16. Therefore, the operator and the towing machine 1 are in progress.
When a large deviation in the moving speed from 0 occurs, a large load is applied to the load detection device 19, so the operating arm 24 limit switch LS2 is turned off to stop the motor and stop the traction machine 10. From this state, the proper load state (5
limit switch LS2 is O
Then, the traction machine 10 advances. In this way, the worker
Since it is towed by the towing machine 10, a part of the weight can be deposited and the walking can be advanced, and the ladder 1 can be easily climbed up and down without supporting the total weight. If the worker is likely to fall by stepping on step 3, etc., the operating arm 24 suddenly crosses the limit switch LS2 and the limit switch LS3 is turned off.

When the ladder 1 is extended by digging down the vertical shaft, a new guide metal fitting 4 is attached to the liner plate L while the ladder material is connected to the upper part of the existing ladder 1. Then, the ladder 1 is slightly lifted by the wire W, and the turning piece 5b of the support fitting 5 is raised so as not to hinder the descent of the ladder 1. Then, suspend the wire W with the winch Wi,
Lower the ladder 1. At this time, the vertical rods 2, 2 of the ladder 1
Is guided by the guide roller 4c of the guide fitting 4 and descends. When the lower end reaches a predetermined position, the turning piece 5b of the support fitting 5 is horizontally inverted and the step 3 of the ladder 1 is placed on the recess 5c.

[0020]

As described above, according to the present invention, since the worker can easily go up and down the ladder, the labor associated therewith can be greatly reduced, and the risk of falling due to stepping off the step or the like. Since it is possible to avoid rising and falling, it is possible to safely climb up and down in high places, the structure is relatively simple, and because it is small, it does not require a large installation space and does not hinder the construction. Have.

[Brief description of drawings]

FIG. 1 is a front view of a worker lifting / lowering traction device according to the present invention.

FIG. 2 is a side view of the traction device.

FIG. 3 is a front view of a ladder.

FIG. 4 is a plan view of a guide fitting.

FIG. 5 is a side view of a guide fitting.

FIG. 6 is a side view of a support fitting.

FIG. 7 is a side view of the tow guide.

FIG. 8 is an exploded perspective view of a towing guide.

FIG. 9 is a side view of the towing machine.

FIG. 10 is a plan view of the towing machine.

FIG. 11 is a bottom view of the towing machine.

FIG. 12 is a front view of the towing machine.

13 (A), (B), (C), and (D) are schematic vertical sectional views of a load detection device.

[Explanation of symbols]

 1 Ladder 2 Vertical Rod 3 Step 4 Guide Metal Fitting 5 Support Metal Fitting 6 Traction Guide 8 Chain 10 Traction Machine 12 Guide Roller 13 Sprocket 16 Motor 19 Load Detecting Device L Liner Plate T Frame W Wire Wi Winch

Claims (4)

[Claims] 1. A ladder for vertically moving a worker provided vertically along a wall surface of a vertical shaft, a traction guide fixed vertically at the center of a step of the ladder, and moved on the traction guide. The pulling guide includes a base plate fixed to the step of the ladder, and a chain stretched vertically on the base plate and fixed by a connecting pin together with the stop plate. The tractor is a sprocket that is meshed with a chain and driven by a motor, a rolling guide roller that is located between a base plate and a stop plate and that prevents the tractor from being separated from the traction guide, and a load applied to the tractor. And a load detecting device for switching between driving and stopping of the motor according to the load, and a connector for connecting the worker and the tractor by connecting to the load detecting device. For lifting Drawing device. 2. The vertical rod of the ladder is provided with a guide groove in a longitudinal direction, and guide walls provided with a guide roller capable of rolling in the guide groove of the vertical rod are provided on a wall surface and a gantry of the shaft. The pulling device for lifting and lowering a worker according to claim 1, wherein a plurality of the pulling devices are provided at different positions. 3. The pedestal is rotatably supported by a mounting piece of the pedestal so as to stand up along the pedestal while falling down to the outside of the pedestal. 2. The operator lifting / lowering device according to claim 1, further comprising a support metal piece provided with a rotating piece having an abutment edge for preventing rotation of the operator. 4. A lower part of the ladder is hung by a wire wound by a winch, a ladder material and a traction guide are connected to an upper part of an existing ladder, and a vertical rod having a guide groove of the ladder is provided on the way of extension thereof. The method of extending the operator traction device according to claim 2, wherein the ladder is fixed while being guided by a guide roller, and the ladder is fixed at a predetermined position.