JP7120888B2 - Lifting jig and lifting method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a technology for pulling a trolley onto a beam steel material.

Plain trolleys and geared trolleys are used to lift and move heavy objects (for example, Patent Document 1). These trolleys are attached to the lower flanges of the elevated beam steel. Beam steel materials include I-type steel for gate-type cranes and equipment frames, and H-type steel for equipment frames. Installation of the trolley on the beam steel is performed by workers using a temporary scaffold assembled to near the height of the beam steel or using an aerial work platform.

JP-A-6-340397

When installing a trolley using a temporary scaffold, it takes time to assemble the temporary scaffold. The higher the beam steel material is, the higher the temporary scaffolding needs to be assembled, and the more time it takes to assemble the temporary scaffolding. The weight of the trolley is, for example, 30 kg for a 3 ton load, 60 kg for a 5 ton load, and 100 kg for a 10 ton load. It is difficult to stably lift such a large and heavy trolley to the upper part of the temporary scaffolding.

In the case of installing a heavy trolley using an aerial work vehicle, two workers are required for the installation work, and the aerial work vehicle bears the weight of the two workers and the weight of the trolley. In this case, if the weight reaches the weight limit of the vehicle for high lift work and the vehicle for high lift extension extends the boom, there is a risk that the safety device of the vehicle for high lift work will be activated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a technology for lifting a trolley onto a beam steel that can solve the above problems.

The hoisting jig of the present invention is a beam steel material, which is I steel or H steel, which is suspended at a high place by connecting the first divided body and the second divided body of the trolley each having one of a pair of wheels. A lifting jig for attaching the trolley to the lower flanges with the pair of wheels resting on the lower flanges on both sides of the trolley, comprising: a clamp fixed to the upper flange of the beam steel; In addition, a first fixed pulley is supported above and on one side of the beam steel material, and a first movable pulley on which the first divided body is suspended is moved to one side of the beam steel material using the first fixed pulley. and a second movable pulley supported by the clamp and supporting a second fixed pulley above and on the other side of the beam steel, and on which the second divided body is suspended. and a second support arm for lifting the steel beam on the other side using the second fixed pulley.

According to the present invention, the first and second support arms support the first and second fixed pulleys above and on both sides of the steel beam. Thus, the first and second fixed pulleys can be used to suspend the first and second movable pulleys below the first and second support arms, and the trolley can be moved via the first and second movable pulleys. 1st and 2nd divided bodies can be hung. Using the first and second fixed pulleys and the first and second movable pulleys, the first and second divisions of the trolley can be lifted on both sides of the steel beam. Since the first and second divisions can be suspended on both sides of the steel beam, the work of connecting the first and second divisions can be performed by a single worker on the aerial work vehicle. .
According to the present invention, since the first and second divided bodies obtained by dividing the trolley are lifted in order, the first and second divided bodies can be lifted with less force than when the trolley itself is lifted.
According to the present invention, since the first and second divisions are lifted using the first and second fixed pulleys and the first and second movable pulleys, the weight of the first and second divisions is greater than the weight of the first and second divisions. It can be done with light force.
Conventionally, two workers and the trolley were placed on the aerial work vehicle when pulling up the trolley to the beam steel, and there was a risk that the safety device of the aerial work vehicle would be activated due to its weight. According to the present invention, it suffices to put one worker and a lifting jig on the aerial work vehicle. The lifting jig has a simple structure and can be made lighter than the trolley. Therefore, according to the present invention, the mounting weight of the vehicle for high-elevation work can be greatly reduced, and the activation of the safety device due to the weight limit of the vehicle for high-elevation work can be prevented.
As a method of pulling up the trolley to the beam steel and installing it on the beam steel, there is a method of using a temporary scaffold, but it takes a very long time to assemble the temporary scaffold. According to the present invention, the trolley is installed by lifting the lifting jig onto the beam steel material by the aerial work vehicle, attaching the lifting jig to the beam steel material, and using the lifting jig to move the trolley first and second. It is necessary to carry out a two-piece lifting. However, these work hours are much shorter than the time required to assemble temporary scaffolding.

In the present invention, the rope, one end of which is connected to the first support arm, is wound around the first movable pulley and the first fixed pulley one or more times, and then the second fixed pulley and the second movable pulley. is hung one or more times, hung on the ground side through the second fixed pulley, the rope is pressed against the first fixed pulley by the first stopper, and the rope is stopped from sliding at the pressing position. A first brake capable of switching between a brake fixed state in which the suspension position of the first divided body is fixed and a brake released state in which the first stopper is separated from the rope, and a second stopper operate the rope. is pressed against the second fixed pulley, and the suspension position of the second divided body is fixed by stopping the slipping of the rope at the pressing position, and the second stopper is separated from the rope. and a second brake switchable to a brake release state, wherein the second divided body is heavier than the first divided body, and the first divided body is suspended from the first movable pulley. In a state in which the body and the second divided body suspended by the second movable pulley are lowered to the ground and the first and second brakes are in the brake released state, the rope hung on the ground side is pulled. As a result, the first divided body is lifted to one side of the beam steel material, the first brake is switched to the brake fixed state, and the rope is further pulled, so that the second divided body is lifted to the beam. The other side of the steel material is lifted, and the second brake is switched to the brake fixed state.

According to the present invention, the rope having one end connected to the first support arm and wound around the first fixed pulley and the first movable pulley of the first support arm is connected to the second fixed pulley and the second pulley of the second support arm. It is hung on a movable pulley. Since the second divided body is heavier than the first divided body, the first divided body can be hoisted while the second divided body is lowered to the ground by pulling the rope hung on the ground side. Then, by pulling the rope with the first brake in the brake fixed state, the second divided body can be lifted.
According to the present invention, by using the rope and the first and second movable pulleys as described above, the first and second divided bodies are sequentially lifted up only by switching the first and second brakes and pulling the rope. be able to. The same applies to the hanging of the first and second divided bodies. Therefore, according to the present invention, the work of lifting and lowering the first and second divided bodies can be easily performed.
In the lifting jig of the present invention, it is also possible to use the first rope for the first support arm and the second rope for the second support arm. That is, the first rope may be connected at one end to the first support arm, hung around the first fixed pulley and the first movable pulley, and then suspended on the ground side. By pulling the first rope to lift the first divided body and then setting the first brake to the brake fixing state, the first divided body can be fixed in the lifted state. Alternatively, the second rope may be connected at one end to the second support arm, hung around the second fixed pulley and the second movable pulley of the second support arm, and then suspended on the ground side. After the second rope is pulled to lift the second divided body, the second brake is set to the brake fixing state, so that the second divided body can be fixed in the lifted state.
When the first and second divided bodies are lifted using the first and second ropes in this way, the ground-side worker who pulls the first and second ropes must stand in a standing position when pulling the first rope, The standing position when pulling the second rope will be changed to the opposite side across the beam steel material. In order to align the heights of the first and second divided bodies after lifting the first and second divided bodies, a worker on the ground side pulls the first rope or the second rope. In addition, the first and second ropes are separately wound on two reels, and the two reels and the lifting jig of the present invention are carried by a plurality of people.
On the other hand, when lifting the first and second divided bodies with one rope, the operator does not need to change the standing position. When the heights of the first and second divided bodies are to be aligned after lifting the first and second divided bodies, after the ropes are fixed by the workers on the ground side, the workers on the elevated side lift the first and second divided bodies. By performing an operation such as putting the second stopper in a brake release state, the heights of the first and second divided bodies can be easily aligned. For example, a worker at a high place simultaneously puts the first and second stoppers in a brake release state, lowers the second division on the heavy side, and raises the first division on the light side, so that the first and second divisions height can be adjusted. In addition, when the first and second divided bodies are lifted with a single rope, only one reel is required because it is sufficient to wind the single rope, and the reel and the lifting jig of the present invention can be carried by one person. can. Thus, hoisting the first and second divided bodies with one rope is better than hoisting the first and second divided bodies with two ropes, from the viewpoint of operability and weight reduction of the jig as a whole. has advantages.

In the present invention, the first fixed pulley is located between a plurality of sheaves arranged in the axial direction and is located between the sheaves and has a height from the axis of the first fixed pulley that is higher than the outer diameter end of the sheave. a first separate plate that prevents the rope from slipping to the adjacent sheave, the first stopper extending parallel to the axis of the first fixed pulley, and the first separate plate having the first 1 brake has a notch for inserting and extracting the first stopper according to the transition between the brake fixed state and the brake released state, and the second fixed pulley includes a plurality of sheaves arranged in the axial direction and the sheaves. a second separate plate that is located between and has a height from the axis of the first fixed pulley that is higher than the outer diameter end of the sheave and prevents the rope on the sheave from slipping to the adjacent sheave; A second stopper extends in parallel with the axis of the second fixed pulley, and the second separate plate has a second stopper which is attached to the second brake as the second brake shifts between the brake fixed state and the brake released state. 2 There is a notch for inserting and removing the stopper.

According to the present invention, since the first fixed pulley has the first separate plate between the sheaves, it is possible to prevent the rope from slipping between the sheaves. Since the first stopper can be inserted into and removed from the notch of the first separate plate, it is possible to prevent the first separate plate from interfering with the first stopper when the first brake is shifted between the brake released state and the brake fixed state. . The same applies to the second fixed pulley.

In the present invention, the clamp rotates about a common shaft, and includes a pair of clamp arms that sandwich the upper flange from both sides with the common shaft positioned above the upper flange, and a pair of clamp arms that hold the upper flange from both sides. and a fastener that fastens the pair of clamp arms in a sandwiched state.

According to the present invention, the lifting jig can be installed on the steel beam simply by placing the lifting jig in an open state on the steel beam and fastening the pair of clamp arms with fasteners. To remove the lifting jig from the steel beam, simply release the fastening of the pair of clamp arms by the fasteners and lift the lifting jig. Therefore, it is easy to install and remove the lifting jig.

In the present invention, the first support arm extends laterally and upward from the clamp arm located on one side of the steel beam, and the second support arm extends from the clamp arm located on the other side of the steel beam. extends laterally and upwardly from the

According to the invention, the first and second support arms extend laterally and upwardly from the clamp, so that the structure is strong against loads from the first and second halves.

The lifting method of the present invention is to connect the first divided body of the trolley, each having one of a pair of wheels, and the second divided body, which is heavier than the first divided body, so that the I-beam is suspended at a high place. Or, in order to attach the trolley to the lower flanges with the pair of wheels resting on the lower flanges on both sides of the H-steel beam, the first segment and the second segment are placed on both sides of the beam steel. A lifting jig fixed to an upper flange of the beam steel material supports a first fixed pulley on one side of the beam steel material above the beam steel material, and on the other side of the beam steel material. A second fixed pulley is supported in the lifting jig, and a rope whose one end is connected to a portion of the lifting jig located on one side of the beam steel is connected to a first movable pulley on which the first divided body is suspended, and the first After being wound around the first fixed pulley one or more times, it is wound around the second fixed pulley and the second movable pulley on which the second divided body is suspended one or more times, and passes through the second fixed pulley to the ground side. by pulling the rope hanging on the ground side in a state in which the first and second divided bodies are lowered to the ground, the first divided body is lifted to one side of the beam steel material, and the A first brake of a lifting jig stops the rope from slipping on the first fixed pulley, fixing the first divided body in a state of being lifted to one side of the beam steel material, and the rope hung on the ground side. By pulling, the second divided body is lifted to the other side of the beam steel material, the second brake of the lifting jig stops the rope from slipping on the second fixed pulley, and the second divided body is lifted to the Fix the lifted state on the other side of the beam steel.

According to the present invention, the lifting jig can be used to lift the first and second divided bodies of the trolley on both sides of the steel beam, as in the effect of the lifting jig described above. One person can connect the first and second divisions using a work vehicle, and attach the trolley to the lower flange of the steel beam.
According to the present invention, since the first and second divided bodies of the trolley are lifted in order, the lifting work can be performed with less force than when the trolley itself is lifted. Moreover, since the lifting work is performed using the first and second fixed pulleys and the first and second movable pulleys, the lifting work can be performed with a force lighter than the weight of the first and second divided bodies.
According to the present invention, the first and second divisions can be hoisted only by switching the first and second brakes and pulling the rope. can be reduced, and the installation work of the trolley can be performed safely.
According to the present invention, since the first and second divided bodies of the trolley can be lifted on both sides of the beam steel using the lifting jig, the trolley can be installed on the beam steel when constructing a temporary scaffold. It can be done in a relatively short time.

It is a figure for demonstrating the purpose of a lifting jig. It is a figure which shows a lifting jig. FIG. 4 is a side view of the first clamp arm; FIG. 11 is a side view of a second clamp arm; It is a figure which shows a 1st fixed pulley. It is a figure which shows a 2nd fixed pulley. It is a figure which shows a brake release state. It is a figure which shows a brake fixation state. It is a figure for demonstrating the installation work to beam steel of a jig|tool. It is a figure for demonstrating the connection work of the 1st divided body to a 1st movable pulley. It is a figure for demonstrating the connection work of the 2nd division body to a 2nd movable pulley. It is a figure for demonstrating the operation|work which lifts a 1st divided body to the one side of a beam steel material. It is a figure for demonstrating the operation|work which lifts a 2nd division body to the other side of a beam steel material. It is a figure for demonstrating the connection work of a 1st, 2nd division body. It is a figure for demonstrating the 2nd modification of the installation operation method of a jig|tool. It is a figure for demonstrating the lifting operation|work of the 1st divided body in a 2nd modification.

(Configuration of lifting jig 1)
FIG. 1 is a diagram for explaining the purpose of the lifting jig 1. FIG.
The hoisting jig 1 is installed on a beam steel material 8 that is bridged at a high place. The beam steel material 8 may be I-steel or H-steel. The lifting jig 1 can be used to lift the first and second divisions 91 and 92 of the trolley 9 on both sides of the beam steel material 8 . The trolley 9 can be divided into divisions each having one of the pair of wheels 911,921. Let the divided body on the light side be the first divided body 91 and the divided body on the heavy side be the second divided body 92 . That is, the second split body 92 is heavier than the first split body 91 .

The second split body 92 has a connecting shaft 922 arranged below the lower flange 81 of the steel beam 8 . The connecting shaft 922 has hooks 923 for connecting heavy objects. The first divided body 91 has a cylindrical portion 912 into which the connecting shaft 922 is inserted. The second divided body 92 can be connected to the first divided body 91 by, for example, inserting the connecting shaft 922 of the second divided body 92 into the cylindrical portion 912 of the first divided body 91 .

The trolley 9 moves on the steel beam 8 by wheels 911 and 921 installed on the lower flanges 81 on both sides of the steel beam 8 to move the heavy load hung on the hook 923 along the steel beam 8 . In this embodiment, the trolley 9 is a geared trolley in which an annular hand chain 924 is rotatably suspended from the second split body 92 . When the operator pulls down and rotates the hand chain 924 , the gears in the second split body 92 rotate to rotate the wheels 911 and 921 and the trolley 9 moves on the beam steel material 8 . The trolley 9 may be a plain trolley that moves on the beam steel 8 by being pushed by an operator. The trolley 9 may be an electric trolley that incorporates a motor that rotates the wheels 911 and 921 and that can be moved on the steel material 8 by button operation.

A worker connects the first and second split bodies 91 and 92 of the trolley 9 lifted on both sides of the steel beam 8 so that a pair of wheels 911 and 921 are mounted on the lower flanges 81 on both sides of the steel beam 8. In resting condition, the trolley 9 can be attached to the lower flange 81 .

FIG. 2 is a diagram showing the lifting jig 1. As shown in FIG. Hereinafter, the lifting jig 1 is simply referred to as the jig 1 .
The jig 1 includes a clamp 2 , first and second support arms 41 and 42 and first and second brakes 51 and 52 .

The clamp 2 is fixed to the upper flange 82 of the beam steel 8 . The clamp 2 comprises first and second clamp arms 21, 22 and a tightening bolt 3 (fastener).

The first and second clamp arms 21 and 22 form a pair and are connected to a common shaft 23 at their upper ends. The first and second clamp arms 21 and 22 rotate around a common shaft 23 . The first and second clamp arms 21 and 22 sandwich the upper flange 82 of the steel beam 8 from both sides in an inverted V-shaped posture in which the common shaft 23 is positioned above the steel beam 8 .

A clamp arm positioned on the left side (one side) of the beam steel 8 in FIG. do. The lower right side of the first clamp arm 21 has a groove 211 into which the left end of the upper flange 82 is inserted. The lower left side of the second clamp arm 22 has a groove 221 into which the right end of the upper flange 82 is inserted.

FIG. 3 is a side view of the first clamp arm 21. FIG.
A pair of steel plates 212 are connected to the first clamp arm 21 by a bolt 214 and a nut 217 via a collar 213 defining a thickness, and by using a common shaft 23 . A screw receiver 215 is fixed to the central portion of the first clamp arm 21 . A screw hole 216 is formed in the longitudinal central portion of the screw receiver 215 .

4 is a side view of the second clamp arm 22. FIG.
The second clamp arm 22 has a configuration similar to that of the first clamp arm 21 . However, in the second clamp arm 22 , the direction of the female screw in the screw hole 224 of the screw receiver 223 is opposite to the direction of the female screw in the screw hole 216 of the first clamp arm 21 .

Returning to FIG. 2, the tightening bolt 3 is a left-right screw, and the direction of the screw on the tip side of the shaft portion 31 is opposite to the direction of the screw on the base end side. The tightening bolt 3 is passed through the screw holes 216 and 224 of the first and second clamp arms 21 and 22 and rotated in one direction to move the first and second clamp arms 21 and 22 in a closing direction. Let The tightening bolt 3 is turned in the opposite direction to move the first and second clamp arms 21 and 22 in the opening direction. In this embodiment, the tightening bolt 3 is used as an example of a fastener for fastening the first and second clamp arms 21 and 22 with the upper flange 82 sandwiched therebetween. However, any suitable fasteners may be used, such as simple bolts and nuts. The first and second clamp arms 21 and 22 may be fastened from both sides with bolt heads and nuts fastened to the bolts.

The first support arm 41 is supported by the clamp 2 and supports the first fixed pulley 61 above the steel beam 8 and on the left side (one side) in FIG. As shown in FIG. 1, the first support arm 41 moves the first movable pulley 71 on which the first divided body 91 is suspended to the left side of the steel beam 8 in FIG. It is for lifting.

Specifically, the first support arm 41 extends leftward and upward in FIG. In the first support arm 41, a pair of steel plates 411 (FIG. 3) are connected by a bolt 413 and a nut 415 (FIG. 3) via a collar 412 (FIG. 3) that defines the thickness. The steel plate 411 is fixed to the steel plate 212 of the first clamp arm 21 . A hole 414 for connecting one end of the rope 93 is provided on the lower side of the first support arm 41 .

One end of the rope 93 may be connected to the first support arm 41 by passing the rope 93 through the hole 414 and tying it. One end of the rope 93 may be a ring-shaped rope attached to a base, and may be hooked on a shackle or the like hooked on the hole 414 . The first support arm 41 supports the first fixed pulley 61 on the distal end side.

FIG. 5 is a diagram showing the first fixed pulley 61. As shown in FIG. A cross-sectional view is shown above the center line of FIG. 5, and a side view is shown below the center line.
In the first fixed pulley 61, two sheaves 611 (pulleys) are aligned in the axial direction. Sheave 611 is provided on sheave bolt 612 . The sheave bolt 612 is a cap bolt with a hexagonal hole in its head. The sheave bolt 612 has a screw formed at the tip of the shaft, and a cap nut 618 is fastened to the screw. A shaft portion of the sheave bolt 612 is not threaded except for the tip portion.

Sheave 611 incorporates bearing 613 and is rotatable with respect to sheave bolt 612 . A groove 614 for guiding the rope 93 is provided on the outer circumference of the sheave 611 . The sheave 611 is pushed to one side in the axial direction of the first fixed pulley 61 . A separate plate 615 (first separate plate) is provided between the sheaves 611 and on the other axial side of the two sheaves 611 . Between each element 411,613,615 is a collar 616 that positions the elements 613,615. Collar 616 is cylindrical and fits over sheave bolt 612 .

The separate plate 615 has a height from the sheave bolt 612 (the axis of the first fixed pulley 62 ) than the outer diameter end of the sheave 611 and prevents the rope 93 on the sheave 611 from slipping to the adjacent sheave 611 .

Returning to FIG. 2 , the second support arm 42 is paired with the first support arm 41 and has the same configuration as the first support arm 41 . The second support arm 42 extends rightward and upward in FIG. The second support arm 42 has a pair of steel plates 421 (FIG. 4) connected via a collar 423 (FIG. 4) by bolts 422 and cap nuts 424 (FIG. 4). The steel plate 421 is fixed to the steel plate 225 of the second clamp arm 22 .

The lower side of the second support arm 42 has a hole 423 that can be used to connect one end of the rope 93 . The second support arm 42 supports the second fixed pulley 62 on the distal end side.

FIG. 6 is a diagram showing the second fixed pulley 62. As shown in FIG. A cross-sectional view is shown above the center line of FIG. 6, and a side view is shown below the center line.
The second fixed pulley 62 differs from the first fixed pulley 61 in that three sheaves 621 are arranged in the axial direction, and the other configuration is the same as that of the first fixed pulley 61 . A groove 624 for guiding the rope 93 is provided on the outer circumference of the sheave 621 . Sheave 621 incorporates bearing 623 and is provided rotatably with respect to sheave bolt 622 . The sheave bolt 622 is a cap bolt with a hexagonal hole in its head, and a cap nut 628 is fastened to its tip. There is a separate plate 625 (second separate plate) between the sieves 621 . Bearing 623 and separate plate 625 are positioned by collar 626 fitted on sheave bolt 622 . The separate plate 625 has a height from the sheave bolt 622 (the shaft of the second fixed pulley 62 ) than the outer diameter end of the sheave 621 and prevents the rope 93 on the sheave 621 from slipping to the adjacent sheave 621 .

FIG. 7 is a diagram showing a brake released state. FIG. 8 is a diagram showing a brake fixed state.
The first brake 51 is made of metal and supported by the first support arm 41 . The first brake 51 can be switched between a brake released state and a brake fixed state. The first brake 51 separates the stopper bar 511 (first stopper) from the rope in the brake released state of FIG. In the brake fixed state of FIG. 8, the first brake 51 presses the rope 93 against the first fixed pulley 61 by the stopper bar 511 to stop the rope 93 from slipping at the pressing position. Thereby, the first brake 51 fixes the hanging position of the first divided body 91 . A configuration example of the first brake 51 when the first brake 51 is a toggle switch will be described below. Any suitable first brake 51 can be used as long as it can be switched between a brake released state and a brake fixed state.

The body plate 512 of the first brake 51 is fixed to the first support arm 41 by fitting the collar 213 of the first support arm 41 at the base end. A lever 513 is connected to the body plate 512 in an upright position with respect to the first support arm 41 . A proximal end of the lever 513 is rotatably connected to the body plate 512 . The switch arm 514 is rotatably connected to the body plate 512 in a posture laid on the first support arm 41 . An arm bar 515 extending toward the first support arm 41 is provided at the tip of the switch arm 514 , and a stopper bar 511 is attached to the tip of the arm bar 515 . The stopper bar 511 extends parallel to the axis of the first fixed pulley 61 and is made of metal. The stopper bar 511 is rod-shaped, more specifically cylindrical, straddling the sheave 611 (see also FIG. 5).

Switch arm 514 is connected to lever 513 via link mechanism 516 . In the first brake 51, as shown in FIG. 7, when the lever 513 is pushed down, the switch arm 514 is lifted by the link mechanism 516 and fixed in this state. As a result, the first brake 51 is brought into the brake released state.

In the first brake 51 , as shown in FIG. 8 , when the lever 513 is erected with respect to the first support arm 41 , the switch arm 514 is laid down by the link mechanism 516 . The posture of the switch arm 514 is fixed with the stopper bar 511 pressing the rope 93 against the first fixed pulley 61 . As a result, the first brake 51 is brought into a brake fixing state.

The second brake 52 is provided on the second support arm 42 and has a posture opposite to that of the first brake 51 . A stopper bar 521 (second stopper) of the second brake 52 straddles three sheaves 621 of the second fixed pulley 62 (see FIG. 6). Other configurations of the second brake 52 are the same as those of the first brake 51 .

As shown in FIG. 7 , the separate plate 615 has a notch 617 in a portion located above the sheave 611 and closer to the center of the jig 1 than right above the sheave 611 . The first brake 51 inserts and removes the stopper bar 511 into and out of the notch 617 as the brake is released and the brake is fixed. The stopper bar 511 presses the rope 93 against the sheave 611 of the first fixed pulley 61 while being inserted into the notch 617 when the brake is fixed. The separate plate 625 of the second brake 52 also has a notch 627 (FIG. 6) similar to the notch 617 of the first brake 51 .

(Installation operation method of jig 1)
Before the jig 1 is installed on the steel beam 8, a rope 93 is wound around the jig 1 as shown in FIG. One end of the rope 93 is connected to the first support arm 41 using the hole 414 of the first support arm 41 . A first movable pulley 71 is attached to a rope 93 whose one end is connected to the first support arm 41 . The first movable pulley 71 has two sheaves 711, and an appropriate one can be used as long as it has a portion for hooking a shackle or the like. The rope 93 is looped twice around the first movable pulley 71 and the first fixed pulley 61 of the first support arm 41 . In order to facilitate carrying of the jig 1 , a rope 93 is looped so that the first movable pulley 71 is positioned immediately below the first support arm 41 . The first brake 51 is brought into a brake fixed state, and the position of the first movable pulley 71 is fixed.

The rope 93 passed through the first fixed pulley 61 is wound around the second fixed pulley 62 of the second support arm 42 . A second movable pulley 72 is attached to a rope 93 that is wound around the second fixed pulley 62 . The second movable pulley 72 has two sheaves 721, and if it has a portion for hooking a shackle or the like, an appropriate one can be used. After the rope 93 is looped around the second movable pulley 72 and the second fixed pulley 62 twice, it is suspended on the ground side via the second fixed pulley 62 . The end 931 of the rope 93 that has passed through the second fixed pulley 62 is wound around the reel 94 (FIG. 9). The rope 93 is wound around so that the second movable pulley 72 is positioned immediately below the second support arm 42 . The second brake 52 is brought into a brake fixed state, and the position of the second movable pulley 72 is fixed.

In the following, an example in which the installation operation of the jig 1 is performed by two people, a worker on the aerial work vehicle and a worker on the ground, will be described. In addition, a plurality of workers may ride on the aerial work vehicle. A plurality of workers may be employed on the ground.

As shown in FIG. 9 , the worker gets on the aerial work vehicle and lifts the jig 1 up to the beam steel material 8 . At this time, the reel 94 winding the rope 93 hanging from the jig 1 is still held by the worker on the ground, and the end 931 of the rope 93 is hung on the ground side.

An operator of the aerial work vehicle places the jig 1 in an open state on the steel beam 8 and tightens the tightening bolt 3 to clamp the first and second clamp arms 21 and 22 across the upper flange 82. be concluded in the state of Thereby, the jig 1 is installed on the beam steel material 8 (procedure 1).

As shown in FIG. 10, the operator of the aerial work vehicle puts the first and second brakes 51 and 52 in the brake released state, and ties the rope to the first movable pulley 71 to pull the first movable pulley from the ground. Lower the pulley 71 to the ground. A ground worker slings the first divided body 91 on the light side of the trolley 9 on the first movable pulley 71 (procedure 2). Slinging means connecting the first divided body 91 to the first movable pulley 71 via a shackle or the like.

As shown in FIG. 11, the operator of the aerial work vehicle lowers the second movable pulley 72 to the ground by, for example, tying an intermediate rope to the second movable pulley 72 and pulling it from the ground. A ground worker slings the second divided body 92 on the heavy side of the trolley 9 on the second movable pulley 72 (procedure 3).

As a result, the first and second divided bodies 91 and 92 having different weights are connected to the rope 93 via the first and second movable pulleys 71 and 72, and are lowered to the ground. Note that "the state in which the first and second divided bodies 91 and 92 are lowered on the ground" means the state in which the first and second divided bodies 91 and 92 are placed directly on the ground, A state in which the divided bodies 91 and 92 are placed on a truck bed or a carriage is also included.

With the first and second split bodies 91 and 92 lowered to the ground, as shown in FIG. 12, when an operator on the ground pulls the end 931 of the rope 93, the second split body 92 on the heavy side is pulled. The first divided body 91 on the light side is lifted up in the state of being lowered to the ground. The rope 93 slides on the second moving pulley 72 to which the second divided body 92 on the heavy side is connected and the second fixed pulley 62 .

The first movable pulley 71 to which the first divided body 91 on the light side is connected is supported by four ropes 93 . Therefore, by pulling the end 931 of the rope 93 with a force equal to or greater than 1/4 of the weight of the first divided body 91, the divided body 91 can be lifted. For example, the weight of the trolley 9 with a lifting load of 10 tons is 100 kg, and the light side of the first divided body 91 is 40 kg. In this case, the first divided body 91 can be lifted by pulling the end portion 931 of the rope 93 with a force of 10 kgf (98 N) or more, which is 1/4 of 40 kgf.

A ground worker pulls the end portion 931 of the rope 93 and lifts the first divided body 91 to the left side of the steel beam 8 in FIG. The operator of the aerial work vehicle sets the first brake 51 to the brake fixed state, and lifts the first divided body 91 to the left side of the steel beam 8 in FIG. 12 and fixes it (procedure 4).

Subsequently, the ground worker pulls the end 931 of the rope 93 again, as shown in FIG. The one end of the rope 93 is fixed between the first brake 51 and the first fixed pulley 61 because the first brake 51 is in the brake fixed state. As a result, when the end 931 of the rope 93 is pulled, the second divided body 92 on the heavy side is lifted.

Since the second movable pulley 72 is supported by the four ropes 93, the second divided body 92 can be lifted by pulling the ends 931 of the ropes 93 with a force equal to or greater than 1/4 of the weight of the second divided body 92. can be lifted. For example, the weight of the trolley 9 with a lifting load of 10 tons is 100 kg, and the weight of the second divided body 92 on the heavy side is 60 kg. Therefore, if the end portion 931 of the rope 93 is pulled with a force of 15 kgf (147 N) or more, which is 1/4 of 60 kgf, the second divided body 92 can be lifted.

A worker on the ground pulls the end portion 931 of the rope 93 and lifts the second divided body 92 on the heavy side to the right side of the beam steel material 8 in FIG. The operator of the aerial work vehicle sets the second brake 52 to the brake fixed state, and lifts and fixes the second divided body 92 to the right side of the steel beam 8 in FIG. 13 (step 5).

As described above, the first and second divided bodies 91 and 92 of the trolley 9 are lifted on both sides of the beam steel material 8 .

As shown in FIG. 14 , the operator of the aerial work vehicle connects the first and second divided bodies 91 and 92 lifted on both sides of the beam steel material 8 . As a result, the trolley 9 can be attached to the lower flanges 81 of the beam steel 8 while the pair of wheels 911 and 921 of the trolley 9 rest on the lower flanges 81 on both sides of the beam steel 8 (step 6).

Thereafter, the operator of the aerial work platform removes the first and second divisions 91 and 92 from the first and second movable pulleys 71 and 72, loosens the tightening bolts 3, and moves the jig 1 onto the beam steel 8. The jig 1 can be lowered to the ground by removing it from the base.

By performing the above steps 1 to 6 in reverse order, the trolley 9 attached to the beam steel 8 can be removed and lowered to the ground.

In the embodiment, the rope 93 is wound around the first fixed pulley 61 and the first movable pulley 71 twice, but the rope 93 may be wound only once, or may be wound three times or more. good. In the embodiment, the rope 93 is hung around the second fixed pulley 62 and the second movable pulley 72 twice, and then lowered to the ground side via the second fixed pulley 62 . However, after the rope 93 is wound around the second fixed pulley 62 and the second movable pulley 72 only once, or after being wound around three times or more, it is lowered to the ground side via the second fixed pulley 62. good too.

(First Modification of Installation Operation Method of Jig 1)
When lifting the chain block attached to the trolley 9, the jig 1 used for lifting the trolley 9 may be used. In this case, the operator of the aerial work vehicle releases only the second brake 52 . The second movable pulley 72 is lowered to the ground, and a worker on the ground slings the chain block onto the second movable pulley 72 . After that, the ground worker pulls the end 931 of the rope 93 and lifts the chain block to the vicinity of the trolley 9 attached to the beam steel 8 . The operator of the aerial work vehicle attaches the chain block to the trolley 9 after setting the second brake 52 to the brake fixed state. By performing the procedure in reverse to the above, the chain block attached to the trolley 9 can be removed and lowered to the ground.

(effect)
In this embodiment, the first and second support arms 41 and 42 support first and second fixed pulleys 61 and 62 above and on both sides of the steel beam 8 . Accordingly, in this embodiment, the first and second movable pulleys 71 and 72 can be hung below the first and second support arms 41 and 42 using the first and second fixed pulleys 61 and 62. Thus, the first and second divisions 91 and 92 of the trolley 9 can be hung below the first and second support arms 41 and 42 via the first and second movable pulleys 71 and 72 .

In this embodiment, first and second fixed pulleys 61 and 62 and first and second movable pulleys 71 and 72 are used to move the first and second divisions 91 and 92 of the trolley 9 to the beam steel material 8 . can be lifted on both sides of the Therefore, in the present embodiment, it is possible for a worker on the aerial work vehicle to perform the connecting work of the first and second divided bodies 91 and 92 by himself.

In this embodiment, since the first and second divided bodies 91 and 92 obtained by dividing the trolley 9 are lifted, the first and second divided bodies 91 and 92 can be lifted with less force than when the trolley 9 itself is lifted. can.

Since the first and second divided bodies 91 and 92 are lifted using the first and second fixed pulleys 61 and 62 and the first and second movable pulleys 71 and 72, the first and second divided bodies 91 , 92, and in this embodiment, a force that is a quarter of the weight of the first and second divided bodies 91, 92. Therefore, in this embodiment, even when lifting the 100 kg trolley 9 with a lifting load of 10 tons, the first divided body 91 can be lifted by 10 kgf (98 N), and the second divided body 92 can be lifted by 15 kgf (147 N). 1. The second divided bodies 91 and 92 can be easily lifted. In this embodiment, since the trolley 9 can be installed by connecting the first and second divided bodies 91 and 92 in a lifted state, the installation work of the trolley 9 can be performed without causing pinching of limbs or back pain. can be done safely by reducing

Conventionally, when lifting the trolley 9 to the beam steel 8, two workers and the trolley 9 were placed on the aerial work vehicle, and there was a risk that the safety device of the aerial work vehicle would be activated due to the weight. In this embodiment, one worker and the jig 1 may be placed on the aerial work vehicle. Here, the trolley 9 with a lifting load of 10 tons is, for example, 100 kg. On the other hand, the jig 1 can be made compact and is mainly composed of steel plates 212, 225, 411, and 421. Therefore, even if the jig 1 can lift the trolley 9 with a lifting load of 10 tons, it weighs about 13 kg. It can be made significantly lighter than 9. Therefore, in the present embodiment, the weight of the vehicle for high-elevation work can be greatly reduced, and the operation of the safety device due to the weight limit of the vehicle for high-elevation work can be prevented.

As a method of lifting the trolley 9 to the steel beam 8 and installing it on the steel beam 8, there is a method of using a temporary scaffold, but it takes a very long time to assemble the temporary scaffold. In this embodiment, the trolley 9 is installed by pulling up the jig 1 onto the beam steel 8 using the aerial work vehicle, attaching the jig 1 to the beam steel 8, and moving the trolley 9 using the jig 1. 1. It is necessary to lift the second divided bodies 91 and 92 . However, these work hours are much shorter than the time required to assemble temporary scaffolding.

A rope 93 having one end connected to the first support arm 41 and wound around the first fixed pulley 61 and the first movable pulley 71 of the first support arm 41 is connected to the second fixed pulley 62 and the first movable pulley 71 of the second support arm 42 . It is hung around the two moving pulleys 72 . Since the second divided body 92 is heavier than the first divided body 91, when the rope 93 hanging on the ground side is pulled, the first divided body 91 is lifted while the second divided body 92 is lowered to the ground. can be lifted. Then, by pulling the rope 93 with the first brake 51 in the brake fixing state, the second divided body 92 can be lifted up. Thus, in the present embodiment, the first and second divided bodies 91 and 92 can be sequentially lifted only by switching the first and second brakes 51 and 52 and pulling the rope 93 . The suspension of the first and second divided bodies 91 and 92 is the same. Therefore, in this embodiment, the work of lifting and lowering the first and second divided bodies 91 and 92 can be easily performed.

Since there is a separate plate 615 between the sheaves 611 in the first fixed pulley 61 , it is possible to prevent the rope 93 from slipping between the sheaves 611 . Since the stopper bar 511 can be inserted into and removed from the notch 617 of the separate plate 615, the separate plate 615 can be prevented from interfering with the stopper bar 511 when the first brake 51 is in the brake fixed state. The same applies to the second fixed pulley 62 as well.

To install the jig 1 on the steel beam 8, the jig 1 is placed on the steel beam 8 in an open state, and the tightening bolt 3 is tightened. Removal of the jig 1 from the beam steel material 8 can be accomplished simply by loosening the tightening bolts 3 and lifting the jig 1 . Therefore, installation and removal of the jig 1 are easy.

Since the first and second support arms 41 and 42 extend laterally and upward from the clamp 2, the structure is strong against loads from the first and second divisions 91 and 92. As shown in FIG.

In the method of lifting the first and second divided bodies 91 and 92 of the embodiment, the first and second divided bodies 91 can be lifted by simply switching the first and second brakes 51 and 52 and pulling the rope 93 by the operator. , 92 can be lifted in sequence. Therefore, the lifting method of the embodiment can reduce the work of lifting the trolley 9 and the first and second divided bodies 91 and 92 by the worker, and enables the installation work of the trolley 9 to be performed safely.

A device including the jig 1, the rope 93, and the first and second movable pulleys 71 and 72 can be regarded as a device for lifting a heavy object such as the trolley 9. The structure, installation operation method, and effect of the jig 1 of the embodiment are merely examples, and should not be construed as limiting the present invention. Appropriate configurations can be added to the structure of the jig 1 of the embodiment, and alternative configurations can be adopted. In the installation operation method of the jig 1 of the embodiment, the order of procedures can be changed, appropriate procedures can be added, and alternative procedures can be adopted.

(Second Modified Example of Installation Operation Method of Jig 1)
15A and 15B are diagrams for explaining a second modification of the installation operation method of the jig 1. FIG.
In the embodiment, the same rope 93 is used for the first support arm 41 and the second support arm 42 by hanging the rope 93 between the first and second support arms 41 and 42 . However, as in the second modification, the first rope 93A can be used on the first support arm 41 side, and the second rope 93B can be used on the second support arm 42 side.

Before lifting the first and second divisions 91 and 92, the first rope 93A is connected at one end to the first support arm 41, and is wound around the first fixed pulley 61 and the first movable pulley 71. The part 931A side is hung on the ground side. The end portion 931A side of the first rope 93A is wound around the reel 94A. The first movable pulley 71 is on the ground and connected to the first divided body 91 . The end portion 931A of the first rope 93A and the first movable pulley 71 are on one side (left side in FIG. 15) of the beam steel material 8 .

Similarly, the second rope 93B has one end connected to the second support arm 42, and after being looped around the second fixed pulley 62 and the second movable pulley 72, the end portion 931B side hangs down on the ground side. be. The end portion 931B side of the second rope 93B is wound around the reel 94B. The second fixed pulley 62 is on the ground and is connected to the second split body 92 . The end portion 931B of the second rope 93B and the second movable pulley 72 are on the other side (right side in FIG. 15) with respect to the beam steel material 8 .

16A and 16B are diagrams for explaining the lifting operation of the first divided body 91. FIG.
A worker on the ground pulls the end portion 931A of the first rope 93A to lift the first divided body 91, and a worker on the aerial work vehicle sets the first brake 51 to a brake fixed state, thereby lifting the first divided body 91. can be fixed in a suspended state. Subsequently, the worker on the ground moves to the other side (right side in FIG. 16) with respect to the steel beam 8, and similarly pulls the end 931B of the second rope 93B to lift the second divided body 92. Then, the worker of the aerial work vehicle sets the second brake 52 to the brake fixed state, so that the second divided body 92 can be fixed in the lifted state. After that, the worker of the aerial work vehicle can connect the first divided body 91 and the second divided body 92 to attach the trolley 9 to the lower flange 81 of the beam steel material 8 .

When the first and second divided bodies 91 and 92 are lifted using the two first and second ropes 93A and 93B in this way, the operator on the ground must be in a standing position when pulling the first rope 93A. , and the standing position when pulling the second rope 93B are changed to the opposite side with the beam steel material 8 interposed therebetween. When the heights of the first and second divided bodies 91 and 92 are to be aligned after lifting the first and second divided bodies 91 and 92, a ground worker pulls the first rope 93A or the second rope 93B. becomes. In addition, the first and second ropes 93A and 93B are separately wound on two reels 94A and 94B, and the two reels 94A and 94B and the jig 1 are heavy and bulky, so that multiple people cannot carry them. Become.

On the other hand, when lifting the first and second divided bodies 91 and 92 with one rope 93 as in the embodiment, the operator does not need to change the standing position. When the heights of the first and second divided bodies 91 and 92 are aligned after lifting the first and second divided bodies 91 and 92, a ground worker fixes the end 931 (reel 94) of the rope 93. After that, the operator of the aerial work vehicle can easily adjust the height of the first and second divided bodies 91 and 92 by operating the first and second stoppers 51 and 52 to release the brakes. can be aligned. For example, a worker who works at high places simultaneously puts the first and second stoppers 51 and 52 into a brake release state, lowers the second divided body 92 on the heavy side, and raises the first divided body 91 on the light side, so that the first , the heights of the second divided bodies 91 and 92 can be made uniform.

In addition, when the first and second divided bodies 91 and 92 are lifted by one rope 93 as in the embodiment, one reel 94 is sufficient because the one rope 93 is wound. The jig 1 can be carried by one person. Therefore, hoisting the first and second divisions 91 and 92 with one rope 93 is easier and easier than lifting the first and second divisions 91 and 92 with two ropes 93A and 93B. There is an advantage in lightening the weight of the tool 1 as a whole.

1... Lifting jig 2... Clamp 3... Tightening bolt (fastener)
8 beam steel 9 trolleys 21, 22 clamp arm 41 first support arm 42 second support arm 51 first brake 52 second brake 61 first fixed pulley 62 second fixed pulley 71 second 1 movable pulley 72 second movable pulley 81 lower flange 82 upper flange 91 first divided body 92 second divided body 93 rope 511 stopper bar (first stopper)
521... Stopper bar (second stopper)
611... Sheave of first fixed pulley 612... Sheave bolt (shaft of first fixed pulley)
615 Separate plate (first separate plate)
617... Notch of first separate plate 621... Sheave of second fixed pulley 622... Sheave bolt (shaft of second fixed pulley)
625 ... Separate plate (second separate plate)
627... Notch of second separate plate 911, 921... Wheel

Claims (5)

By connecting the first and second divisions of the trolley each having one of a pair of wheels, the above-mentioned A lifting fixture for mounting the trolley to the lower flange on a pair of wheels, comprising:
a clamp fixed to the upper flange of the beam steel;
While being supported by the clamp, a first fixed pulley is supported above and on one side of the beam steel material, and the first movable pulley on which the first divided body is suspended is moved using the first fixed pulley. a first support arm for lifting to one side of the beam steel;
While being supported by the clamp, a second fixed pulley is supported above and on the other side of the beam steel material, and the second movable pulley on which the second divided body is suspended is moved using the second fixed pulley. a second support arm for lifting to the other side of the beam steel ,
The rope, one end of which is connected to the first support arm, is wound around the first movable pulley and the first fixed pulley one or more times, and then passed through the second fixed pulley and the second movable pulley one or more times. It is hung around and suspended on the ground side through the second fixed pulley,
a brake fixing state in which the rope is pressed against the first fixed pulley by a first stopper to stop the rope from slipping at the pressed position, thereby fixing the suspension position of the first divided body; and the first stopper. a first brake that can be switched to a brake release state that separates from the rope;
a brake fixing state in which the second stopper presses the rope against the second fixed pulley and stops the rope from slipping at the pressing position, thereby fixing the suspension position of the second divided body; and the second stopper. is separated from the rope, and a second brake that can be switched to,
The second divided body is heavier than the first divided body,
The first divided body suspended by the first movable pulley and the second divided body suspended by the second movable pulley are lowered to the ground, and the first and second brakes are the brakes. In the released state, by pulling the rope hanging on the ground side, the first divided body is lifted to one side of the beam steel while the second divided body is lowered to the ground,
the first brake is switched to the brake fixed state;
By further pulling the rope, the second divided body is lifted to the other side of the beam steel material,
The second brake is switched to the brake fixed state
A lifting jig characterized by: The first fixed pulley is located between a plurality of sheaves arranged in the axial direction and is located between the sheaves and has a height from the axis of the first fixed pulley higher than the outer diameter end of the sheave, and the rope on the sheave is adjacent. and a first separate plate that prevents displacement of the sheave of
the first stopper extends parallel to the axis of the first fixed pulley;
The first separate plate has a notch for inserting and removing the first stopper as the first brake shifts between the brake fixed state and the brake released state,
The second fixed pulley is located between a plurality of sheaves arranged in the axial direction and is located between the sheaves and has a height from the axis of the second fixed pulley higher than the outer diameter end of the sheave, and the rope on the sheave is adjacent. and a second separate plate that prevents displacement of the sheave of
the second stopper extends parallel to the axis of the second fixed pulley;
2. The second separate plate has a notch for inserting and removing the second stopper as the second brake shifts between the brake fixed state and the brake released state. Lifting jig as described. a pair of clamp arms that rotate about a common shaft and sandwich the upper flange from both sides with the common shaft positioned above the upper flange;
a fastener that fastens the pair of clamp arms while sandwiching the upper flange from both sides;
The lifting jig according to claim 1 or 2 , comprising: The first support arm extends laterally and upward from the clamp arm located on one side of the steel beam,
The lifting jig according to claim 3 , wherein the second support arm extends laterally and upward from the clamp arm positioned on the other side of the steel beam. A beam steel material, which is I steel or H steel, which is strung at a high place by connecting a first division body of a trolley, each having one of a pair of wheels, and a second division body that is heavier than the first division body. A lifting method for lifting the first divided body and the second divided body to both sides of the beam steel material in order to attach the trolley to the lower flange with the pair of wheels resting on the lower flanges on both sides of the ,
A lifting jig fixed to the upper flange of the steel beam supports a first fixed pulley on one side of the steel beam above the steel beam, and a second fixed pulley on the other side of the steel beam. , a rope having one end connected to a portion of the lifting jig located on one side of the steel beam is hung one or more times on the first movable pulley on which the first divided body is suspended and the first fixed pulley. After being rotated, the second fixed pulley and the second movable pulley on which the second divided body is suspended are hung one or more times, and suspended on the ground side via the second fixed pulley. By pulling the rope hanging on the ground side while the second divided body is lowered to the ground, the first divided body is moved from the beam steel material while the second divided body is lowered to the ground. Lift to one side,
stopping the rope from slipping on the first fixed pulley by a first brake of the lifting jig, and fixing the state in which the first divided body is lifted to one side of the beam steel material;
By pulling the rope hanging on the ground side, the second divided body is lifted to the other side of the beam steel material,
A lifting method, wherein a second brake of the lifting jig stops the rope from slipping on the second fixed pulley, and the second divided body is fixed in a state of being lifted on the other side of the steel beam.

Images