JP4308896B2 - Removal method of bridge deck - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for removing a concrete floor slab that needs to be repaired due to aging or the like.
[0002]
[Prior art]
In order to repair concrete floor slabs of bridges that have been damaged by traffic loads or that have deteriorated over time, it is necessary to dismantle and remove existing slabs. Also, the truck load standards for bridges have been raised, and it has become necessary to remove the old standard floor slabs and replace them with new standards.
Conventionally, the floor slab was crushed and removed with a breaker or the like, but protective work was necessary to prevent the crushed pieces from falling, and the efficiency was poor. Also, in the method of cutting the floor slab into blocks with a cutter and pulling it up with a crane etc., the floor slab and the girder are firmly connected with a gibber, and when releasing this connection, the floor slab is lifted rapidly and the equipment It was difficult to perform safe construction because it could damage the door and harm the surroundings.
[0003]
Therefore, a method of cutting the floor slab and dividing it into blocks, lifting the block upward using a jack, and releasing the breakage of the connection between the floor slab and the girder with that force is disclosed in Japanese Patent Publication No. 7-26369 and No. 7-26371 is proposed.
As shown in Fig. 6, the former method is to cut a concrete floor slab and divide it into blocks, install a beam straddling the block, pull up the block with a center hole jack provided on the beam, and peel it off the girder It is. In the latter method, as shown in FIG. 7, the beam is bridged across the removal block, the beam and the block are connected with a steel rod, the beam is lifted with jacks arranged at both ends, and the removal block is peeled off from the beam. Is.
[0004]
[Problems to be solved by the invention]
The blocks are divided into widths of about 2m. Therefore, the beams straddling them become a large device exceeding 2m, which is heavy and requires a lot of labor for transportation and installation even if it is equipped with movement aids such as casters. In addition, movement during work on site was not easy.
In addition, a large force is required to peel off the floor slab connected with the girders and the gibber, and a device having a large capacity is required to obtain this with the lifting force of the jack.
The field work is preferably performed with a simple device, and the present invention enables the removal of the floor slab with a simple device and the concrete floor slab with a smaller force.
[0005]
[Means for Solving the Problems]
For this reason, when removing a concrete floor slab of a bridge, the floor slab is cut and divided into a plurality of blocks, the insulator is placed symmetrically with a distance to the removal block, and the arm of the insulator and the removal block are connected. By lifting the end of the arm and competing against the opposing lion, the connection between the removal block and the girder is released and removed.
[0006]
Specifically, the insulator has a support leg at the end of the arm, the support legs of the insulator are placed symmetrically on the removal block, and the arm of the insulator and the removal block are connected with a steel rod or the like, The end of the lever's arm is lifted with a jack, the supporting leg is tilted to compete with the end of the lever, and the removal block and girder are released by the action of the lever and removed.
The corners of the insulator are chamfered or curved in order to perform the competition of the insulators smoothly.
[0007]
If the width of the removal block is large and the lever arm does not reach the next block, a spacer is placed between the levers to compete.
Furthermore, by providing a hinge on the spacer, it is possible to smoothly perform the competition of the insulators.
[0008]
The insulators are opposed to each other with a gap, and one device is miniaturized, making it easy to carry in a narrow area on the bridge, and to easily install and move on site.
In addition, since the removal block is peeled and removed from the girders by competing for the lever, the jack's power is amplified by the action of the lever, and the jack's ability is smaller than the conventional one.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
As shown in FIG. 1, the concrete floor slab 1 is cut into 2 m wide blocks 21, 22, and 23 with a concrete cutter, and a through hole is made in this block with a hole saw or a drill. Whether to cut the block or drill the through hole first is determined in consideration of the ease of work on site.
[0010]
Next, as shown in the plan view of FIG. 3, the support legs 12 of the insulator 10 are symmetrically arranged at the center of the removal block 21 to be peeled off from the girders with an interval of 80 mm. In the illustrated example, two sets are installed in parallel. The end portion of the arm 11 of the insulator 10 reaches the adjacent blocks 22 and 23. When the width of the removal block 21 is larger than the arm 11 of the insulator 10 and does not reach the adjacent block, as shown in FIG. 4, the installation interval of the support legs 12 is increased, and the spacer 15 is interposed between the opposing insulators 10. Or add an extension member.
The spacer 15 includes an extension member 16 and a hinge 17 that rotatably connects the extension member.
[0011]
A groove is provided in the central portion of the arm 11 of the insulator 10 so that the steel bar 5 can be fixed at an arbitrary position. Moreover, you may make it provide the some hole which attaches the steel bar 5 in the middle.
A threaded steel rod 5 (Gevin destab) is fixed to a portion where the position of the through hole provided in the removal block 21 coincides with a support plate and a nut, and the arm 11 of the insulator 10 and the removal block 21 are connected.
When the jack 6 provided at the end of the lever 10 is operated in synchronization and the arm 11 of the lever 10 is lifted upward, the support leg 12 rotates around the lower end of the support leg 12, as shown in FIG. Both support legs 12 come into contact with each other at the corners and compete. Since a large load acts on the corners of the support legs 12 when competing, it is reinforced, chamfered so as to be easily rotated, or formed into a curved surface.
[0012]
When the jack 6 is further extended, the corners of the support legs 12 are pressed against each other, and the arm 11 of the lever 10 rotates with the contact part of the support legs 12 as a fulcrum to pull up the steel bar 5. The lifting force transmitted to the steel bar 5 lifts the removal block 21 from the lower surface, destroys the removal block 21 and the connecting member such as the girders of the spar, and peels the removal block 21 from the spar.
[0013]
When the removal block 21 is peeled from the girders, the removal block 21 is temporarily held, the insulator 10 is moved from the removal block 21, and the removal block 21 is removed by a forklift or a crane.
Repeat this process to remove all concrete slabs.
[0014]
【The invention's effect】
Two insulators are placed facing each other, and they compete against each other, and the removal block is raised upward by the action of the insulators, so a beam larger than the block width is not required, and the floor slab is installed with a simple device suitable for narrow work sites. Can be removed.
Further, since the block is lifted by the lever action, the coupling between the floor slab and the girder can be broken with a jack having a smaller capacity compared to the conventional one, the capacity of the hydraulic pump may be small, and the downsizing of the apparatus can be achieved.
In addition, since the two divided insulators are used, it can be easily moved and installed even on a narrow bridge, and can be easily moved and installed using a machine such as a backhoe.
Since the removed block can be easily transported to a collecting place by a forklift or the like, the cycle time can be shortened as compared with the crane work.
[Brief description of the drawings]
FIG. 1 is a front view of a removal device.
FIG. 2 is a front view at the time of removal work.
FIG. 3 is a plan view during removal work.
FIG. 4 is an enlarged view showing a state in which a hinge is inserted into the insulator.
FIG. 5 is a side view of an insulator.
FIG. 6 is a perspective view at the time of removal using a conventional removal device.
FIG. 7 is a front view of another conventional example.
[Explanation of symbols]
1 Concrete floor slab 21 Removal blocks 22, 23 Adjacent block 3 Cutting line 5 Steel bar 6 Jack 10 Insulator 11 Arm 12 Support leg 15 Spacer 17 Hinge

Claims (6)

Cut the concrete floor slab of the bridge into multiple blocks, place the insulators symmetrically on the removal block at intervals, connect the insulator arms to the removal block, lift the insulator arms with jacks, and A method of removing a bridge deck that lifts the removal block and peels it off the girder in a state where the ends are brought into contact with each other. The method for removing a bridge deck according to claim 1, wherein the insulator is an arm and a support leg of the arm. 3. The method for removing a bridge floor slab according to claim 2, wherein a through hole is provided in the removal block and connected to a steel bar extending from an arm of the insulator. 4. The method for removing a bridge deck according to any one of claims 1 to 3, wherein a spacer is installed between opposing insulators to be integrated with each other. 4. The method for removing a bridge deck according to claim 1, wherein a spacer having a hinge is interposed between opposing insulators. A bridge floor slab removal device comprising two independent insulators having support legs at one end and a spacer having a hinge interposed between the two insulators.

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