JPH06136722A - Bridge floor plate disassembly method and device therefor - Google Patents

Abstract

PURPOSE:To improve working efficiency of disassemblying a bridge floor plate by cutting a floor board into a plural number of blocks, drilling lifting holes in the blocks, laying a removal girder across the reaction leg portion positioned on adjacent blocks on both sides and lifting up the blocks upon connecting the removal girder and the blocks together through the lifting holes. CONSTITUTION:A concrete floor plate 1 required to be disassembled is cut into a plural number of blocks 3. Lifting holes 4 is then drilled in the blocks 3. A reaction leg portion 7 provided with a reaction jack 8 is positioned on blocks 32, 32 adjacent to the block 31, which is to be freed from anchored to a bridge girder 5, and a removal girder 6 is laid across the leg portions 7 so as to make a vertical move by virtue of the action of a piston 81 of the reaction jack 8. The removal girder 6 and the block 31 are connected together by means of inserting lifting bolts 9 through a through hole 62 drilled in the removal girder 6 and lifting holes 4 on the block 31 and secured with nuts 10. The reaction jack 8 is then actuated to elevate the piston 81. When the removal girder 6 is pushed upward, the block 31 is pulled by the lifting bolts 9 causing the bridge girder 5 to be separated from the block 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for dismantling a concrete bridge slab that needs to be reconstructed due to deterioration or the like easily and economically.

[0002]

2. Description of the Related Art Concrete bridge slabs on elevated roads, etc. may deteriorate or become damaged over time.
There is a need for remodeling, and it is necessary to dismantle and remove the floor slab when remodeling.

The usual method of dismantling is to restrict traffic on one lane on the bridge, occupy the construction site, and then use a crusher such as a concrete breaker to sequentially remove the slab concrete from the end. Alternatively, divide it into blocks with a concrete cutter or concrete breaker in advance to a size that can be carried out by a truck, etc., and lift it up with a crane and carry it out.

However, in the former method, the demolished slab concrete falls down, so it is necessary to receive it on a scaffold on the river, and it is considerable to raise the concrete once dropped and carry it out. Requires manpower and cost,
In the latter method, the slab concrete is usually fixed to the bridge girder by reinforcing bars or steel materials that stop slabs, and unless it is demolished and released with a concrete breaker, it is difficult to lift it with a crane, etc.,
The size of the slab block will also be small, and a considerable amount of concrete will fall onto the scaffolding, which will require considerable manpower and expense to clear it up. The impact when released from the stop is large, and the reaction may cause the crane to tip over, which is dangerous, and depending on the bridge, the crane's elevation angle cannot be taken, and therefore a corresponding force cannot be exerted.

Therefore, the present inventor has previously proposed Japanese Patent Application No. 2-41.
Cutting the floor slab as seen in No. 8570 into a plurality of blocks and opening a lifting hole penetrating the upper and lower surfaces,
Providing fulcrums to receive reaction force on the blocks on both sides adjacent to the block that is trying to release the fixation, and bridge the removal girder,
A bridge floor slab dismantling method was proposed, in which a center hole jack was installed on the removal girder, the center hole jack and the lower surface of the floor slab were fixed through the lifting holes, and the block was lifted by operating the center hole jack. .

According to this method, it is possible to reduce the manpower and the cost for carrying out the concrete lumps that have fallen due to the conventional slab concrete being sequentially destroyed from the end portions. Furthermore, unlike lifting and breaking with a crane, there is no risk of the rollover of the crane when using a crane to break, and the separated blocks can be easily removed with a crane or the like. Since it can be removed, it has the advantage of being safer and easier than the method of hoisting and breaking it using a crane or the like, but it is not inconvenient in practice.

[0007]

For example, (1) the center hole jack has a relatively short expansion and contraction length, and therefore the floor slab cannot be lifted high. (2) Each time the floor slab is lifted, A relatively heavy center hole jack must be set on the floor slab,
(3) When moving the removal girder and the center hole jack, due to the structure, the removal caster is lowered and raised by moving the moving casters up and down, which complicates the work. The present invention is intended to solve such practical problems.

[0008]

In order to solve the above-mentioned problems, the present invention, when dismantling a bridge slab, cuts the slab to be disassembled into a plurality of blocks and forms a lifting hole through the upper and lower surfaces. Position a reaction leg with a reaction jack on the blocks on both sides of the block that is to be opened and adjacent to the block to release the anchor, and bridge the removal girder to this reaction leg to release the removal girder and the anchor The block to be tried was connected with a hoisting bolt through the hoisting hole, and the block was hoisted by using a reaction force jack.

Further, as a bridge floor slab dismantling device, a removal girder capable of attaching a suspension bolt is bridged to a reaction force leg portion provided with a reaction force jack located on both adjacent blocks of a block whose release is to be released. It was decided to provide a device in which a caster for movement is attached to the removal girder via an attachment member.

[0010]

[Operation] Relocating the reaction leg with the reaction jack to the adjoining concrete block of the cut concrete block to release the anchor, and to release the removal girder and anchor anchored on the reaction leg Blocks are connected by suspension bolts and the reaction force jacks are used to lift the blocks.Therefore, concrete around the slabs at the anchorages of the bridge girder and concrete block is pulled and shearing is promoted. Destroy and separate.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show an embodiment of the present invention.
Is a schematic view seen from the bridge axis direction, and FIG. 2 is a schematic view seen from the top,
Fig. 3 is a detailed view of the main part as seen from the direction perpendicular to the bridge axis, and Fig. 4 is Fig. 3
5 is a partial cutaway view taken along the line A-A of FIG. 5, FIG. 5 is a schematic view showing a broken state of the floor slab fixing portion, and FIG. , B are explanatory views showing a moving time, FIG. 7 is also a conventional example diagram, A is a lifting time of a floor slab, and B is an explanatory view showing a moving time.

First, in FIGS. 1 and 2, a concrete floor slab 1 that needs to be disassembled is cut 2 into a plurality of blocks 3 using a concrete cutter or the like, and a lifting hole 4 for lifting, which will be described later, is provided in the block 3. To open a hole. It does not matter if the work of cutting into blocks and the opening of the lifting holes are moved back and forth.

Next, referring to FIGS. 3 and 4, the piston 81 and the cylinder tube 8 are attached to the blocks 32 and 32 adjacent to the block 31 which is going to release the fixation with the bridge girder 5.
The reaction force leg portion 7 having the reaction force jack 8 made of 2 is positioned, and the removal girder 6 made of H steel or the like is placed there.
It is bridged so as to move up and down by the operation of the piston 81.

In this embodiment, the reaction force leg portion 7 and the removal girder 6 are integrated with each other by slidably fitting the fixed cylinder bodies 71 and 61 so that they cannot be separated from each other. Although the cylinders 71 and 61 are shown in this embodiment, they may be omitted.

Here, the pair of reaction force leg portions 7 and the removal girder 6 are set in advance so that the reaction force leg portions 7 are positioned in the blocks 32 on both sides of the block 31 for releasing the fixing, as shown in FIG. By thus attaching the moving casters 11 to the removal girder 6 via the attachment members 12, the bridge deck slab dismantling device is obtained.

The withdrawal girder 6 and the block 31 for releasing the fixing are connected to the insertion hole 62 provided in the withdrawal girder 6 and the hoisting hole 4 formed in the block 31 through the hoisting bolt 9, and by the nut 10. Fixed.

Preparation is made in this way for releasing the block 31 from the bridge girder 5, and then the reaction force jack 8
And the piston 81 is raised, the removal girder 6 is pushed upward. When the removal girder 6 is pushed upward, the suspension bolt 9 pulls the block 31 to pull and shear around the slab stopper 13 in the fixing portion, so that the bridge girder 5 and the block 31 are separated in the state shown in FIG. To do.

After the block 31 is separated from the bridge girder 5, the suspension bolt 9 connecting the removal girder 6 and the block 31 is removed from the nut 10, and the removal girder 6 is moved. The block to be separated is separated from the bridge girder, and the separated block is lifted by a crane or the like and removed.

FIG. 7 shows an apparatus with casters shown in the disassembling method proposed in Japanese Patent Application No. 2-418570.

In FIG. 6, when the block 31 is lifted, as shown in FIG. 6A, the piston 81 of the reaction force jack 8 is
6C, the moving caster 11 is raised, and when moving, as shown in FIG. 6B, by lowering the piston 81, the cylinder tube 82 is raised and the reaction force leg portion 7 is raised. The caster 11 is grounded.

In FIG. 7, when the block 31 is lifted,
As shown in FIG. 7A, the moving caster is lifted by operating the handle so as not to interfere with the lifting of the block 31, and at the time of moving, the moving caster 11 is lifted while operating the handle to pull up the removal girder 6. Ground.

[0022]

Since the present invention is constructed as described above,
It has the following effects. Cut the floor slab into multiple blocks and open the lifting holes that penetrate the upper and lower surfaces, and position the reaction force legs equipped with reaction force jacks on the blocks on both sides adjacent to the block to release the fixing. , The reaction girder is bridged with the removal girder, and the block to be released from the removal girder and the anchor is connected with the hanging bolt through the lifting hole, and the reaction force jack works to release the anchor. Are lifted upwards, which promotes the tensioning and shearing of the concrete around the anchorage slab stop. Therefore, the area near the slab stop is destroyed and the block and bridge girder are separated. Since the separated block can be easily removed by a crane, etc., it is safer than the method of hoisting and breaking using a crane or the like.

Next, in the present invention, since the reaction force jack is used, the expansion / contraction length is longer than that of the center hole jack, so that the floor plate block to be released from fixing can be lifted at a large height. .

By using a reaction force jack,
As in the case of using the center hole jack, the trouble of setting the heavy center hole jack and the block each time the floor slab block is lifted is eliminated, and work efficiency and safety can be improved.

When installing and using the casters for moving, it is not necessary to lift the removal girder by the casters for moving when moving, unlike when using the center hole jack, and the operation is simple and the working time is reduced, so that work is performed. Increases efficiency.

[Brief description of drawings]

FIG. 1 is a schematic view in the bridge axis direction illustrating an embodiment of the present invention.

FIG. 2 is a schematic top view illustrating an embodiment of the present invention.

FIG. 3 is a detailed view of a bridge axis perpendicular direction for explaining a main part of the present invention.

FIG. 4 is a partially cutaway view taken along the line AA of FIG.

FIG. 5 is a schematic view showing a broken state of a floor slab fixing unit.

FIG. 6 is an embodiment diagram in which the removal girder is provided with a transfer caster.

FIG. 7 is a view showing a conventional example in which a removal caster is provided with a transfer caster.

[Explanation of symbols]

 1 Concrete floor slab 2 Cutting 3 Block 31 Block that tries to release anchorage 32 Adjacent block 4 Lifting hole 5 Bridge girder 6 Removal girder 7 Reaction force leg 8 Reaction force jack 81 Reaction force jack piston 82 Reaction force jack cylinder tube 9 Lifting bolt 10 Nut 11 Transfer caster

Claims (2)

[Claims] 1. A reaction force leg provided with a reaction force jack on both sides of a block which is adjacent to the block to release fixing, by cutting the floor slab into a plurality of blocks and opening a lifting hole penetrating the upper and lower surfaces. Position the part, bridge the removal girder to this reaction force leg, connect the removal girder and the block to release the fixing with the hanging bolt through the lifting hole, and lift the block by operating the reaction force jack A method for dismantling a bridge floor slab. 2. A pair of reaction force legs provided with reaction force jacks located on both sides of adjacent blocks of the block where the fixing is to be released are bridged with a removal girder capable of mounting a suspension bolt and attached to the removal girder. A bridge floor slab dismantling device characterized in that a caster for movement is attached through a member.