JP3255733B2 - PC board lifting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for lifting precast concrete wall plates and floor plates (hereinafter referred to as PC plates).

[0002]

2. Description of the Related Art Conventionally, as a lifting device for removing, erecting, and moving a PC board formed on a bed, as shown in FIG. 2, 3 and 4 are fixedly attached and suspended.
a, 3a, 4a, and each of the hanging hooks 2a, 3a, 4
a was hooked on hook studs 6, 7, and 8 protruding from the PC board 5, and the wire 9 provided on the balance material 1 was wound up by a hoist or the like, so that the PC board 5 was detached, erected, and lifted. There is something. In the figure, 3b is a chain block.

[0003]

By the way, as shown in FIG. 6, for example, as the PC board, there is an irregularly shaped PC board having a portion 5a having a high wall height in a part of the PC board 5.

[0004] When such a modified PC board 5 is erected by the above-mentioned conventional lifting device, the following problem arises. As shown in FIG. 6, the hanging positions of the hanging ropes 2, 3, and 4 with respect to the PC board 5 are such that the two hanging ropes 2, 3 are hook streaks 6, 7 on the upper side of the low wall, and other One hanging rope 4
On the hook streaks 8 on the upper side of the high wall portion 5a.

In FIG. 7, when the hanging ropes 2, 3, and 4 are hung on the PC board 5A lying on the bed, the height (distance) from the hook streaks 6, 7, 8 to the balance material 1A is set. Are the same, and the hanging ropes 2 and 3 and the hanging rope 4 of the portion 5a having a high wall height are in the same tension state as shown in the figure.

However, in this state, the balance material 1 is
When the PC board is lifted at 0a and moved by the crane 10 to erect the PC board in an inclined state of 5B, the balance 1
The height to B becomes shorter than the height from the hook streaks 6 and 7 to the balance material 1B, and a step H occurs in these.

As a result, the hanging ropes 2 and 3 become tensioned, but the other hanging ropes 4 play loose as shown in the figure, and the load on the hook streaks 8 of the high wall portion 5a is eliminated, and the young P
In the C plate, there is a problem that the high wall portion 5a is warped downward, and the PC plate is deformed and cracks C are generated.

Further, when the PC board is erected in a vertical state as shown by 5C in FIG. 7, the hanging rope 4 further slackens. When the PC board is lifted from the bed in this state, as shown in FIG. Is supported only by two suspension ropes 2 and 3. Therefore, the wall on the right side of the hook streaks 7 in FIG. 6 has a cantilever structure supported by the hook streaks 7, and an excessive load is applied to the hook streaks 7 to generate cracks C on the PC board. There's a problem.

Further, as shown in FIG. 8, instead of the above-mentioned irregularly shaped PC board, even if it is a normal PC board having the same wall height over its entire length, the 6, 7, 8 It is difficult to completely match the protruding lengths of the hook streaks, and the protruding lengths of the hook streaks are irregular.

If the PC board adhered to the bed as described above is erected against the adhesive force due to such irregularities, a hook streak having a long protruding length, for example, the hook streak 7 shown in FIG.
Play occurs in the suspension rope 3, and a crack C as shown in FIG.

Conventionally, as shown in FIG. 8, a chain block 3b is provided on the central hanging rope 3, and when the projection lengths of the hook streaks 6, 7, 8 are not uniform as described above, the chain block 3b is operated. Then, the entire length of the hanging rope 3 is adjusted to prevent cracks.

However, it is difficult to adjust a slight difference in the protruding length of each hook streak by using the chain block 3b, and even if this chain block is used, generation of cracks cannot be prevented.

Accordingly, an object of the present invention is to propose a PC board lifting apparatus which does not cause such a problem.

[0014]

According to the present invention, in order to solve the above-mentioned problems, fixed rollers (13) and (14) are mounted on both ends of a balance material (11) which is suspended by a hoist or the like and raised and lowered.
A plurality of movable rollers (15, 16, 17) are provided on the lower side of the balance material (11) so as to be movable in the lower side direction, and the loop-shaped support rope (18) is attached to each of the rollers (13 to 13).
17) and hang between the rollers (13 to 17) on the lower side of the support rope (18),
The hanging support rope (1) between each roller (13-17)
8) is provided with a hanging pulley (23a-26a) in a rotatable manner, and each of the hanging pulleys (23a-26a) has a hanging rope (23-26) provided with a hanging hook (23b-26b) at the lower end.
26).

[0015]

When the oddly shaped PC board (5) having a part (5a) with a high wall height is partially erected from the bed, the hooks (23b-26b) of the hanging ropes (23-26) are connected to the PC.
The balance material (11) is lifted by a hoist or the like by being hooked on hook streaks (27 to 30) provided on the plate (5).

As shown in FIG. 4, when the PC board (5) is in the middle of being erected and is in an inclined state, a portion (5a) where the wall height is high is provided.
In step (H), the height from the hook streak (30) to the balance material (11) and the height from the hook streaks (27 to 29) to the balance material (11) in the other low portions are different, and the wall height is lower. The hanging rope (26) of the high part (5a) and the supporting rope part (18a) with which the hanging rope (26) engages tend to sag.

However, the supporting rope portion (18a) is pulled by the other supporting rope portions (18b to 18d) and moves, and the supporting ropes (18a to 18d) are balanced with the load imposed on the suspension pulleys (23a to 26a). 18) The movement stops.

Therefore, each of the hanging ropes (23 to 26) is tensioned by the same tension, and each of the hanging hook bars (27 to 3) is tensioned.
Part (5a) where the burden load of (0) becomes uniform and the wall height is high
Is also erected with the same lifting force as the other parts.

Further, when the PC board is suspended after being erected, the portion (5a) having a high wall height is also supported as described above. In addition, in the case of a regular PC board having the same wall height over the entire length instead of such a deformed PC board, and the projection lengths of the hook streaks are not uniform, the hanging ropes of the hook streaks having a long projection length are used. Play occurs. However, the play is lifted by the other suspension ropes via the support ropes 18, and the load imposed on each hook streak becomes equal, and the same suspension force is generated in each hook streak, and the PC board is erected. You.

Further, there is a difference in wall height as described above,
If the hanging hooks are irregular in length, a slight change in stress occurs in each hanging hook when the PC board is erected.
In this case, since the support rope (18) is formed in a loop shape, the support rope portions on the left and right sides of the suspension rope in the portion where the stress change occurs make the load applied to each suspension hook uniform.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in FIGS. 1 to 4 will be described. Numeral 11 denotes a balance material formed in a predetermined length, which is supported in a horizontal state by a lifting wire 12 of a hoist 10a, and is lifted and lowered by hoisting and rewinding the lifting wire 12 by the hoist 10a. The hoist 10a is moved by the crane 10.

Reference numerals 13 and 14 denote fixed rollers provided at both ends of the balance material 11. Movable rollers 15, 16 and 17 are provided on rails 11a provided on the lower side of the balance material 11, and are movable in the longitudinal direction of the balance material 11.

Numeral 18 denotes a loop-shaped support rope which extends between the fixed rollers 13 and 14, and a lower side of which is extended above the movable rollers 15, 16 and 17. Further, the length of the support rope 18 is set such that the rope at the lower side between the fixed rollers 13 and 14 hangs slightly as shown in FIG.

Reference numerals 19 and 20 denote upper support rollers of the support rope 18. Reference numerals 21 and 22 denote stoppers formed of coil springs, each of which is disposed at an angle, and the lower end thereof is a balance material 1.
1 and the upper end is fixed to the support rope 18.

Reference numerals 23, 24, 25, and 26 denote four suspension ropes, each having the same length, and a suspension pulley 23 at the upper end thereof.
a, 24a, 25a, 26a are provided, and each of the pulleys is rotatably hung on the lower side of the support rope 18. Further, hanging hooks 23b, 24b, 25b, 26b are provided at lower ends of the hanging ropes 23, 24, 25, 26, respectively.

Reference numeral 5 denotes a PC board, which has a high wall portion 5 as described above.
This is a modified PC board having a. 5b and 5c are P
5 shows a window hole formed in the C plate 5. Hook bars 27, 28 and 29 are provided on the upper side of the lower wall portion of the PC board 5, and hook bars 30 are provided on the upper side of the high wall portion 5a.

Next, the work of erecting a PC board will be described. The PC board to be erected is a modified PC board as shown in FIG. As shown in FIG. 4, each of the hook streaks 27 to of the lying PC board 5 </ b> A after being cast on a bed, cured, and cured.
The hooks 23b to 26b of the suspension ropes 23 to 26 are hooked on the hook 30 as described above.

In this state, since the height from the hook streaks 27 to 30 to the balance material 11A is the same, a uniform load acts on each of the suspension ropes 23 to 26 in the initial stage of suspension in this state. , Lower hook streaks 27, 28, 2
The odd-shaped PC board is erected by applying an even load to the hook streaks 30 at a position as high as 9.

In FIG. 4, when the wire 12 is wound up while the hoist 10a is moved to the left from A to B, C and D by the crane 10, the balance material 11 becomes 11 in FIG.
The PC board rises while moving from A to 11B, 11C, and 11D, and the PC board is erected from 5A to 5B, 5C, and 5D.

In the standing state from 5A to 5D, the height from the hook streaks 30 of the high wall portion 5a to the balance material 11 is from the hook streaks 27, 28, 29 of the low wall portion to the balance material 11. Is smaller than the height H, and the step H increases as the angle increases.

At this time, the support rope 18 is provided so as to be freely movable with respect to each of the movable rollers 13 to 17, and a uniform tensile stress is applied to the support rope 18 over its entire length. Therefore, the supporting rope portion 18a of the portion of the suspension rope 26 that is likely to sag due to the step H
Is the supporting rope part 1 of the part of the hanging ropes 23, 24, 25
As shown in FIG. 1, the suspension ropes 8 b, 18 c, and 18 d are pulled, and the suspension posture of the support rope 18 is stopped in a state where the load on each of the suspension pulleys 23 a to 26 a is balanced.

Further, the movable rollers 15 to 17 move to the position of the center of gravity between the hook streaks 27 to 30 and stop. As a result, the hook streaks 27, 28, 2
9 and equalize the load on the hook 30 at the high position,
The deformed PC board can be removed, raised and lifted.

When the center of gravity of the PC board is significantly deviated, for example, in FIG. 1, when the load on the right side of the PC board 5 is larger than the left side, the support rope 18 is turned clockwise from the state of FIG. It may move. In this case, FIG.
The coil spring-shaped stopper 21 on the left side of FIG. If the load on the left side is excessive, the right coil spring-shaped stopper 22b is
6 is suppressed.

FIG. 5 shows a case where a normal rectangular PC board having no such a high wall portion 5a is erected. In this case, since there is no step H at the time of erecting, the suspension pulleys 23a to 26a of the suspension ropes 23 to 26 are located at the same height.

In the case where the wall height is the same over the entire length as shown in FIG. 5, if the projection lengths of the hook streaks 27 to 30 are not uniform, the hooking ropes of the hook streaks having the longer projection length may be used. Play occurs. However, the play is lifted by the other hanging ropes via the loop-shaped rope 18, and the load on each of the hook streaks 27 to 30 is equalized. A board is erected and lifted.

Further, since the support rope 18 is formed in a loop shape and laid as described above, the following operations and effects are obtained. As described above, when the attachment position of the hook streaks 30 is different from the attachment position of the other hook streaks 27, 28, 29, or when the protrusion lengths of the hook streaks 27 to 30 are different, the PC board A phenomenon occurs in which the length of the hanging portion of the support rope 18 changes continuously as the standing angle of the support rope 18 increases.

In this case, if the hanging portion of the support rope 18 and each of the suspension ropes 23 to 26 cannot be kept in the same state and have the same tension, the PC board warps and cracks occur in the young concrete. .

Therefore, in order to cope with a pure stress generated near each hook streak portion of the PC board during the erecting work, the support rope 18 needs to respond to the change in the stress with a delicate movement. .

Therefore, as in the present invention, the support rope 18
Are formed in a loop shape and both sides thereof are fixed rollers 1
By supporting the supporting rope 18 in the loop direction by supporting the supporting rope 18, the hanging part is pulled right and left due to a change in the suspension load acting on the hanging part of the supporting rope 18. It is designed to respond softly and quickly to movement.

The number of hook streaks and the number of hanging hooks supporting the hook streaks may be four or more depending on the lateral length of the PC board. Area).

[0041]

As described above, according to the present invention, even when a deformed PC board having a part with a high wall or a PC board having a different projection length of a hook streak is to be built or suspended. Further, since each hook streak can be supported with the same lifting force, it is possible to prevent the occurrence of cracks due to the deformation of the PC board as in the related art.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is an explanatory view showing a standing state.

FIG. 5 is a front view showing a state in which a PC board having a uniform wall height is suspended and supported.

FIG. 6 is a front view of a case where an odd-shaped PC board is lifted by a conventional lifting device.

FIG. 7 is an explanatory view showing the standing state.

FIG. 8 is a front view showing a case where a PC board having a different projection length of a hook streak is lifted by a conventional lifting device.

[Explanation of symbols]

 11 Balance material 13,14 Fixed roller 15-17 Movable roller 18 Support rope 23-26 Suspended rope 23a-26a Suspended pulley 23b-26b Suspended hook

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B66C 1/10 B66C 1/62 B66C 13/08

Claims (1)

(57) [Claims] 1. Fixed rollers (13) and (14) at both ends of a balance material (11) suspended and raised by a hoist or the like.
A plurality of movable rollers (15, 16, 17) are provided on the lower side of the balance material (11) so as to be movable in the lower side direction, and the loop-shaped support rope (18) is attached to each of the rollers (13 to 13).
17) and hang between the rollers (13 to 17) on the lower side of the support rope (18),
The hanging support rope (1) between each roller (13-17)
8) is provided with a hanging pulley (23a-26a) in a rotatable manner, and each of the hanging pulleys (23a-26a) has a hanging rope (23-26) provided with a hanging hook (23b-26b) at the lower end.
26) A lifting device for a PC board, comprising: