JP2005211254A - Wire rope tensioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tensioner of a horizontal master rope which is tightened between poles for preventing a spiderman from falling under construction of high-rise buildings, and to take effect for a wire rope, especially for a synthetic resin-coated wire rope. <P>SOLUTION: The tensioner has a mechanism for obtaining necessary tensile strength by easily making fine adjustment, a winding mechanism capable of setting at the middle position of the wire rope in the longitudinal direction, and a buffering mechanism for absorbing and alleviating high shock load while falling. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  This application is a tensioner of horizontal master rope stretched between pillars for the purpose of preventing the fall of workers at high places, such as construction sites of high-rise buildings. Of course, wire rope as well as synthetic resin-coated wire rope This is related to a tension device that takes effect.

Synthetic resin-coated wire rope (hereinafter referred to as “wire rope”) is stretched between the pillars of the construction site as a horizontal master rope, and the hook provided on the lifeline tip of the safety belt attached to the waist of the operator is hooked. Therefore, construction methods to prevent crashes were used.
In such a construction method, in general, a method of stretching a wire rope is to connect a wire rope having a wire socket at the tip to one pillar using a shackle, and to use a shackle for the other pillar. The turnbuckle was connected, the end of the wire rope was inserted through the turnbuckle and folded, the folded portion was fixed with a plurality of wire clips, and then the turnbuckle was tightened to tension the wire rope.

  The above conventional wire rope tensioning method requires the use of a number of tensioning devices such as shackles, turnbuckles, wire clips, etc., and the number of tensioning operations is large and takes a long time. Therefore, since a large number of workers are required, there is a high risk of falling in high-altitude work.

In order to solve the above drawbacks, there is one disclosed in Japanese Patent No. 3232061.
This has a pair of parallel side plates, a mounting shaft for attaching a hook fixed to the front end of the side plate, and a through-hole through which a wire rope provided rotatably at the rear end of the side plate is drilled. A drum and a ratchet formed at the opening end of the through hole at the center in the outer peripheral direction of the drum at the edge and at the opening end at the inclined axis along the periphery of the drum in the axial direction and fixed coaxially with the drum A wheel, a ratchet that meshes with the ratchet wheel and restricts the rotation of the drum only in the winding direction of the wire rope, a spring that biases the ratchet in the meshing direction with the ratchet wheel, and the spring And a release device that holds the mesh in the release state.
Japanese Patent No. 3232061

The tensioning device of the invention achieves the intended purpose of greatly simplifying and speeding up the tension fixing work and shortening the dangerous working time at a high place, but has completely solved the problem. It couldn't be said.
In other words, the equipment used for the purpose of preventing such a fall at the time of lateral movement is stretched between the pillars of high-rise buildings under construction, etc. In ordinary construction, the distance between the pillars is always constant, so in such use, the wire rope inserted through the drum's through hole is bent at almost the same point, deteriorated over time, and synthesized. Cracks are likely to occur in the resin. Therefore, the subject that a water droplet etc. penetrate | invade from there and rust generate | occur | produces on a wire rope and causes a strength fall arises.

  Further, when inserting the wire rope through the through hole, the end of the wire rope is found and inserted, which is a troublesome work.

  In addition, an operator hooks a safety belt on the wire rope to prepare for a crash, and uses it as a handrail when moving, so if the wire rope is slack, it becomes unstable and becomes a dangerous situation. Therefore, it was often observed that the wire rope was tensioned more than necessary.

  When applying this tension, unlike a fiber rope, in the case of a wire rope having high rigidity, the ratchet mechanism meshed delicately. When the ratchet meshes out of place, the stretched length of the wire rope moves by 3 to 6 mm, and the tension of the highly rigid wire rope varies greatly due to this slight difference in length. Since the change in the tension of the wire rope can be felt by hand, the operator inevitably tends to be over-tensed by acting even tightly.

  Tensioning the wire rope with high tension in this way makes it difficult to absorb and relax the high impact load at the time of the fall, and the tensioner itself does not have an impact absorbing mechanism, so if the operator falls For example, a wire rope with less elongation than a fiber rope and a large impact load are applied to the worker, and the operator's body damage and the wire rope breakage can be considered.

In this application, in order to solve these problems, a mechanism that can be obtained while easily adjusting the required tension, a winding structure that can be set even in the middle position in the length direction of the wire rope, and absorbing and mitigating high impact loads when dropped A wire rope tensioner provided with a buffer structure is disclosed.
Specifically, a structure in which the wire rope W is wound around the taper-shaped drum 4 is adopted, and most of the tension is handled by the large diameter portion of the drum base, and the wire rope end portion of the small diameter portion is wound up with almost no load. As a result, the tail processing of the wire rope W is facilitated.
Further, when winding the wire rope W around the drum 4, one end of the shaft 2 of the drum 4 is fixed to the frame 1 in a cantilever state so that it is not necessary to start winding from the end, and the winding space is rotatable. The lid frame 7 is configured to be freely opened and closed. The lid frame 7 is provided with a tail pin 71, a main bearing 72, and an opening 73 for handling the tail.

Ratchet teeth 41 are engraved on the edge of the outer diameter of the drum 4 on the frame 1 side of the drum 4 toward the center, and a lock claw 31 with a spring is provided on the center side. A ratchet mechanism corresponding to 41 is provided.
A pair of the lock claws 31 are provided with the shaft 2 interposed therebetween, and the tip ends thereof are two ridges corresponding to the tooth portions, and the pair of lock claws 31 do not mesh with the ratchet teeth 41 simultaneously.
The half of the ratchet teeth 41 is displaced by half, and when the two claw 31 of the lock claw 31 is completely engaged, the two claw 31 of the other lock claw 31 is located in the middle of the crests and valleys of the ratchet teeth 41. To do. (Fig. 6)

  The ratchet teeth 41 can only be provided about 80 teeth due to the weight restrictions and strength problems of the device of the present application requiring compactness, and the drum is located at a central angle of 4.5 degrees per tooth. Since the length of the wire rope W wound around 4 is 5 to 6 mm, the difference between the ratchet teeth at the time when the tension is gradually applied and becomes almost the desired tension is 50 to 100 kgf (0.49 to .0. 98KN), but in order to enable a little fine adjustment, a structure in which any one of the pair of lock claws 31 is selected and meshed is adopted.

Further, when an impact load at the time of falling is applied to the wire rope W that has been wound and tensioned, the pulling force of the wire rope W promotes the reverse rotation of the drum 4, and the ratchet teeth 41 and the lock claws 31 mesh with each other, and the lock claw mounting plate 3 also rotates integrally, and the anti-rotation shaft 32 having a predetermined strength connecting the lock claw mounting plate 3 and the frame 1 is cut.
The impact load is relieved by this cutting force, and the contact pin 33 protruding from the lock claw mounting plate 3 that rotates together with the drum 4 at the position where the wire rope W is fed out by about 60 mm makes contact with the frame 1 in the reverse rotation. Thus, an impact buffer structure for stopping further rotation of the drum 4 is provided.

  Further, a turnbuckle shaft 8 is provided at the attachment portion between the wire rope tensioner and the structure of the present application, and a tension mechanism capable of fine adjustment is provided.

The drum 4 of the wire rope tensioner of the present application has a tapered configuration in order to enable stable tension setting.
Therefore, a large frictional resistance is generated between the drum 4 and the wire rope W and between the wire ropes W due to the tension applied to the wire rope W and the load that the wire rope W tries to slide to a small diameter. This makes it easier to set the tension.

  Further, the load applied to the wire rope W is distributed over the entire width of the drum 4, and the damage is very small as compared with the method of winding the rope through the through hole and winding it. Therefore, one place of the wire rope W is not intensively damaged and can be used repeatedly.

  In addition, the ratchet teeth 41 provided on the outer side of the drum 4 are engraved as much as possible, and the tip contact portions of the corresponding lock claws 31 are doubled to ensure strength, and the ratchet teeth of the pair of lock claws 31 are provided. By arranging the contact position with 41 shifted by a half mountain, the tension can be adjusted with a fine step selection. (Fig. 6)

Since the wire rope tensioner of the present application adopts a structure in which one of the main frames 1 can be opened and closed and the winding part of the drum 4 can be opened, the intermediate part of the wire rope W can be wound and fixed. . Therefore, it is not necessary to prepare a wire rope W cut from the end or cut to a length matching the diameter of the structure under construction.
Also, if the lid frame 7 is provided with a tail pin 71 for handling the tail, and the lid frame 7 is normally closed, the tail pin 71 automatically fixes the tail bending of the wire rope W to prevent loosening. To do.

Further, the main bearing 72 of the lid frame 7 prevents the main shaft 2 from being deformed even if a large load is applied to the wire rope W when a crash occurs.
Further, when the wire rope W of the drum 4 is rotated forward, a rotation-preventing shaft 32 having a predetermined strength that is planted on the lock claw mounting plate 3 and fixed to the main frame 1 reversely rotates the drum 4. When the falling load to be applied is applied, the ratchet teeth 41 and the lock claw 31 mesh with each other and rotate together with the lock claw mounting plate 3, and break when reaching a predetermined strength.
By this breaking action, the drop impact load is absorbed and relaxed, the drum is rotated about 60 degrees, and the wire rope W is fed out about 60 mm. Therefore, the tension applied to the wire rope W is relaxed and reduced, and the wire rope W is cut and the terminal fixing portion is prevented from coming off, thereby preventing a serious accident.

  The present application can be easily removed by simply opening the lid frame 7 and manually removing the wire rope W from the tail and the drum 4. Since the drum 4 has a tapered shape, tension is applied to the wire rope W of the large-diameter portion, but the wire rope wound around the large-diameter portion instead of the tensile tension as it moves to the small-diameter portion. This is because W is in a state where only a pushing load is applied to move to the small diameter portion, and the wire rope W of the small diameter portion can be easily removed. Therefore, it can be easily withdrawn without using a tool.

  In addition, a nut is provided on the main frame 1, one end of the turnbuckle shaft is screwed in, and a tip metal fitting provided with a nut is provided on the other, so that the final tension of the wire rope W can be performed and it is securely installed between the columns. Can do.

Detailed description of the first embodiment of the present application,
A lock claw mounting plate 3 in which a lock claw 31 that operates outward is disposed in a substantially symmetrical position with a disc shape sandwiched between the center is inserted into the main shaft 2 protruding and fixed to the main frame 1. The main frames 1 are connected to each other by a rotation stop shaft 32, and ratchet teeth 41 corresponding to the lock claws 31 of the lock claw mounting plate 3 are provided toward the outer wall edge end in the center direction, and the bottom portion is successively reduced in diameter. A taper drum 4 is inserted and engaged with the lock claw 31, and a lid frame 7 is rotatably provided with a shaft 5 provided at one end of the main frame 1 as a base end, and the base end of the lid frame 7 is provided. Has a tail pin 71, a main bearing 72 in the middle, and an opening 73 in the tip so that the winding space of the drum 4 can be closed and opened freely.
When a load is applied to the wire rope W wound around the drum 4, the ratchet teeth 41 and the lock claws 31 of the drum 4 are engaged and locked.

Detailed description of the second embodiment of the present application,
A lock claw 31 is provided on the main shaft 2 projecting and fixed to the main frame 1 and is arranged in a disc-like shape with a center sandwiched between them. The mounting plate 3 is inserted, the lock claw mounting plate 3 and the main frame 1 are connected to each other by a rotation stop shaft 32 having a predetermined strength, and the ratchet teeth 41 corresponding to the lock claw 31 of the lock claw mounting plate 3 are connected to the outer wall edge. A taper drum 4 provided at the end toward the center and having a bottom that is successively reduced in diameter is fitted into and engaged with the lock claw 31, and the shaft 5 provided at one end of the main frame 1 is rotated as a base end. A lid frame 7 is provided freely, a tail pin 71 is provided at the base end portion of the lid frame 7, a main bearing 72 is provided at the intermediate portion, and an opening 73 is provided at the distal end portion to close the winding space of the drum 4. It is configured to be freely opened.
When a load is applied to the wire rope W wound around the drum 4, the ratchet teeth 41 of the drum 4 and the lock claw 31 are engaged with each other, and a rotational force is applied to the lock claw mounting plate 3 so that the rotation stop shaft 32 set to a predetermined strength. Breaks and absorbs and relaxes the load, and the contact pin 33 comes into contact with the main frame 1 to be in the final locked state, and has a mechanism for reducing the tension of the impact load.

In the present application, a turn buckle shaft 8 is provided at an attachment portion with a structure, and a tension mechanism capable of fine adjustment is provided.
A through hole is provided in the central portion of the turnbuckle shaft 8 so that it can be rotated by inserting a sinus.
In general, frame type turnbuckles and pipe type turnbuckles are well known, but they all rotate on the nut side screwed with right and left screws, but the turnbuckle shaft 8 of the present application is the main frame. A right-handed nut is provided on one side, and a left-handed nut is provided on the U-shaped end fitting 9 side.
Further, it is possible to perform tension only on the main frame 1 side by making the U-shaped end fitting 9 side rotatable.

In the present application, since the tapered drum 4 is used, a large frictional resistance is generated between the drum 4 and the wire rope W and between the wire ropes W due to the tension of the wire rope W and the load that the wire rope W tends to slide to a small diameter. Occurs, and this becomes a large gripping force.
In this structure, since the load applied to the wire rope W is dispersed without being concentrated in one place, the damage to the wire rope W is very small. Therefore, the wire rope W can be used repeatedly.
The present application is a structure in which the wire rope W is stretched by turning the drum 4 with a spanner, but with a normal spanner (length 20 cm), the tension is about 0.5 to 0.6 KN, and a large spanner exerts a large force. Even if added, the tension does not become higher than necessary.

When the wire rope W with less elongation is used for the horizontal master rope, the tension applied at the time of falling prevention becomes very large, which may cause a very serious accident such as the wire rope W being cut or the terminal coming off.
Therefore, in the present application, a structure for preventing over tension is added, and when the tension of about 10 KN or more is applied, the rotation stop shaft 32 is broken, so that the drum 4 is rotated about 60 degrees and the wire rope W is Roll out about 60mm. Thereby, the tension of the wire rope W is greatly reduced.

In the mounting method of the present application, first, the end fitting 9 is directly mounted on a mounting plate provided on the H steel column or the steel pipe column, or is mounted on a mounting wire rope mounted on the H steel column or the steel pipe column via a carabiner or the like. Then, the tightening nut 61 is loosened, and the lid frame 7 is removed from the connecting shaft 6. Then, the wire rope W is wound around the drum 4 in a single layer from the large diameter side to the small diameter side about two and a half times. Remove the slack of the span while pulling the end side by hand. Further, the hexagonal shaft 42 of the drum 4 is rotated by a ratchet wrench to remove the slack of the wire rope W. The wire rope W hanging from the drum 4 is passed between the tail shaft 5 and the tail pin 71.
Then, the lid frame 7 is rotated while the wire rope W is not loosened, the opening 73 is hung on the connecting shaft 6, and the tightening nut 61 is tightened so that the lid frame 7 does not come off.
Subsequently, the turnbuckle shaft 8 is rotated by the tip of the ratchet wrench or a sinus to perform final tension.
This completes the installation.
In the case of detaching, the turnbuckle shaft 8 is rotated and loosened in the reverse manner, then the tightening nut 61 is loosened, the lid frame 7 is removed from the connecting shaft 6, and the wire rope W is removed from the drum 4. The removal is now complete.

The perspective view of this-application wire rope tensioner. The front view of this-application wire rope tensioner. The top view of this-application wire rope tensioner. The rear view of this-application wire rope tensioner. The rear view of the place which buffered the wire rope tensioner of this application. The front view of the tension fine adjustment mechanism of this-application wire rope tensioner. The perspective view which shows the relationship between the main frame of this-application Claim 1, and a lock nail | claw attachment plate. The perspective view which shows the relationship between the main frame of this-application Claim 2, and a lock nail | claw attachment plate. The front side perspective view of this-application wire rope tensioner.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main frame 2 Main axis | shaft 3 Lock claw mounting plate 4 Drum 5 Tail shaft 6 Connection axis 7 Lid frame 8 Turnbuckle axis 9 Tip metal fittings
31 Locking claw
32 Non-rotating shaft
33 per pin
41 ratchet teeth
42 Hex axis
61 Tightening nut
71 Butt Hand Pin
72 Main bearing
73 Opening W Synthetic resin coated wire rope

Claims (3)

  A lock claw mounting plate 3 in which a lock claw 31 that operates outward is disposed in a substantially symmetrical position with a disc shape sandwiched between the center is inserted into the main shaft 2 protruding and fixed to the main frame 1. The main frames 1 are connected to each other by a rotation stop shaft 32, and ratchet teeth 41 corresponding to the lock claws 31 of the lock claw mounting plate 3 are provided in the center direction toward the outer wall edge. The tapered drum 4 is inserted and engaged with the lock claw 31, and a lid frame 7 is rotatably provided with a shaft 5 provided at one end portion of the main frame 1 as a base end portion. A wire rope tensioner comprising a tail pin 71, a main bearing 72 in the middle, and an opening 73 in the tip so that the winding space of the drum 4 can be closed and opened.   A contact pin 33 protrudes from the lock claw mounting plate 3 of the wire rope tensioner, and the lock claw mounting plate 3 and the main frame 1 are connected by a rotation stop shaft 32 having a predetermined strength and wound around a drum 4. When a load is applied to the wire rope W, the ratchet teeth 41 of the drum 4 and the lock claw 31 are engaged with each other, a rotational force is applied to the lock claw mounting plate 3, and the anti-rotation shaft 32 having a predetermined strength is broken to apply the load load. The wire rope tensioner according to claim 1, further comprising a mechanism for absorbing and reducing tension.   A tension mechanism is provided in which a nut is provided at one end of the main frame 1 of the wire rope tensioner, one end of a turnbuckle shaft 8 is screwed into the nut, and a tip fitting 9 having a nut is threaded into the other. The wire rope tensioner according to claim 1 or 2, wherein

Images