JPH0643682B2 - Bridge floor slab removal method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Purpose of the Invention] (Field of Industrial Use) The present invention is to remove a bridge floor slab that needs to be reconstructed due to deterioration and the like with low pollution and economical efficiency. Concerning the method of removing bridge deck slabs that can be used.

(Prior Art) Bridge slabs on elevated roads, etc. are deteriorated or damaged due to the passage of time and need to be reconstructed. At the time of renovation, concrete slabs that form the bridge slabs are required. Need to be removed.

The usual method of removal is to cut the concrete slab vertically along the bridge girder using a concrete cutter, as shown in Fig. 11, and at appropriate intervals in the longitudinal direction either before or after. The width direction is also cut vertically to form a concrete block, and the cut concrete block is suspended and removed using a large crane or the like as shown in FIG. After removing the concrete block, as shown in FIG. 13, the residual concrete on the bridge girder is crushed using (a) a human breaker or (b) a large hydraulic breaker, or (c) crushed by a hydraulic crusher. Thereafter, as shown in FIG. 14, the floor slab fixing anchor is cut by a gas cutter or the like, and floor slabs are collected by a belt conveyor or the like.

(Problems to be Solved by the Invention) However, such a removal method causes various problems.

First, cutting the concrete slab in the width direction of the bridge must of course be done in the vertical direction on both sides in the bridge girder direction, and the cutting itself requires a considerable amount of time. Besides,
Since the residual concrete on the bridge girder is crushed by a breaker, noise, vibration, and dust pollution are significant, which is not suitable for urban work, but also causes damage to the bridge girder. Moreover, even after removing the concrete floor slab, the work of cutting the anchor for anchoring the floor slab, the work of collecting the crushed concrete, etc.
The next task is forced.

In view of such a point, the present invention intends to provide a method for removing a bridge floor slab with low pollution and economy as described below.

[Structure of Invention]

(Means for Solving Problems) Basically, the present invention solves the problem by horizontally cutting the haunch portion of the contact portion between the concrete floor slab and the bridge girder and the floor slab fixing anchor, and It makes a concrete block by cutting in the vertical direction and makes it easy to remove the concrete block separated from this bridge girder, and it is to solve the above problems by removing it by hanging etc. Further, preferably, as one of the concrete methods of horizontally cutting the haunch part of the contact portion between the concrete floor slab and the bridge girder together with the floor slab fixing anchor, the sawing wire is cut in the bridge girder contact portion cutting line direction of the concrete floor slab. Along with running along with forming a sewing wire endlessly and moving it while rotating the sewing wire Specifically, this endless sewing wire is made to follow the cutting line on both sides of the haunch part, and the direction is changed to the spatial direction by using a direction changing pulley provided in the middle, and the end thereof is changed. Part is rotatably wound around the rotating body of the driving device that moves through the moving rail, and is rotated by the rotation of the rotating body, and the driving device is moved through the moving rail, so that the haunch part is fixed to the floor plate by the sawing wire. It is intended to remove this concrete block as a concrete block by cutting it horizontally with the anchor, and if necessary, temporarily connect the cut concrete floor slab or block to the bridge girder and let the vehicle pass through. It is possible.

(Operation) In the above configuration, the concrete floor slab is horizontally cut together with the floor slab fixing anchor by the disc blade, the sawing wire, the water jet, or the horizontal direction at the haunch portion of the contact portion between the concrete slab and the bridge girder. It is easy to remove because it is cut in the vertical direction along with the width.

(Example) Next, the Example of this invention is described based on drawing.

1 to 3 are schematic explanatory views showing a cutting method using a sawing wire, showing a side surface, a plane, and a cross section taken along the line AA of FIG. 1, respectively.

In the drawings, 1 is a concrete floor slab, 2 is a bridge girder, 3 is a floor slab anchoring anchor, 4 is a sawing wire, 5 is a direction changing pulley, 6 is a drive device, 7 is a moving rail, and 8 is an insertion hole.

The concrete floor slab 1 is placed on the bridge girder 2 and fixed by the floor slab fixing anchor 3. Floor slab anchor 3
For example, as shown in FIG. 4, a combination of a steel plate and a reinforcing bar (a), a stud dowel (b), a reinforcing bar or a tightening iron (c), a square steel and a reinforcing bar (d), a reinforcing bar (e), etc. Yes, the flange 2a of the bridge girder 2 and the haunch portion 1a of the concrete floor slab 1 are firmly fixed.

In the concrete floor slab 1 thus formed, the haunch portion 1a at the contact portion with the bridge girder is horizontally cut together with the floor slab anchoring anchor 3, and the width direction of the concrete floor slab 1 is vertically cut. As a block, concrete floor slab 1 and bridge girder 2 are separated. The cutting in the horizontal direction and the cutting in the vertical direction in the width direction may be mixed.

The cutting in the horizontal direction is performed by applying a sawing wire, a disk-shaped blade, a water jet, etc. to the cutting point and moving them in the horizontal direction.

A commonly used sewing wire 4 is endlessly formed by passing a wire 4b through a plurality of diamond beads 4a as shown in FIGS.

The sewing wire 4 is inserted into the insertion hole 8 which is formed at a right angle to the bridge girder 2 of the haunch portion 1a of the concrete floor slab 1 so as to extend along the cutting line direction, and along the cutting line direction on both sides of the haunch portion 1a. Turn to the spatial direction with. At the end of the haunch part 1a, for example, at the expansion joint position, the sawing wire 4 may be along the end surface of the haunch portion 1a without providing the insertion hole 8 and along the both-side cutting line direction. In this embodiment, the direction is changed downward through the direction changing pulleys 5 attached to both sides in the cutting line direction, and further, the direction is changed horizontally by the lower direction changing pulleys 5. This direction change can maintain a moving space for moving the sawing wire 4 in the cutting direction as the cutting progresses. A moving rail 7 for moving the driving device 6 is laid below and the driving device 6 is located. The sawing wire 4 whose direction has been changed is wound endlessly around a rotating body of a drive device 6 that moves via a drive device moving rail 7 that is laid below so as to be rotatable by the rotation of the rotating body. The drive device 6 rotates the sawing wire 4 by the rotation of the rotating body, cuts the haunch portion 1a by the sawing wire 4, and the drive device 6 moves through the moving rail as the cutting progresses, and the sawing wire 4 moves. It is designed to keep the tension constant.

Then, the sewing wire 4 is moved along the cutting line direction of the haunch portion 1a, the direction is changed, and the rotating body of the drive device 6 is driven endlessly when the rotating body of the drive device 6 is endlessly wound. The sawing wire 4 thus rotated rotates under tension and cuts the inner surface of the insertion hole 8. When the driving device 6 is moved along the moving rail 7 as the cutting progresses, the tension of the sawing wire 4 is maintained and the cutting is further advanced in the horizontal direction, so that the concrete floor slab 1 together with the floor slab anchoring anchor 3 are bridge girders. Separate from 2.

After that, the concrete blocks are cut at appropriate intervals in the width direction in the vertical direction. The cutting in the vertical direction in the width direction may be performed before the cutting in the horizontal direction. In this case, the cutting portion may be the insertion hole 8 of the sawing wire.

Next, FIG. 7 shows an example in which a disc blade is used to horizontally cut the haunch portion 1a at the contact portion with the bridge girder 2 and the fixing anchor.

The disk-shaped blade 14 has an anchor 17a on the side surface of the bridge girder 2.
It is attached to the drive device 16 connected to the holding portion 15 held by the drive device moving rail 17 attached by. The driving device 16 rotates the disk-shaped blade 14 by driving the motor, and cuts the haunch part 1a at the contact portion with the bridge girder 2 and the fixing anchor by the disk-shaped blade 14, and as the cutting progresses, the driving device moving rail 1
The holding part 15 is moved along 7 and moved.

For cutting in the horizontal direction, the disc-shaped blade 14 is used for the haunch portion 1.
Apply to a. After the horizontal cutting, as in the case of sawing wire cutting, vertical cutting is performed in the width direction at appropriate places to form concrete blocks.

By temporarily connecting the cut concrete slab 1 to the bridge girder 2, the traffic can be opened even before the removal.

An example of temporary connection is shown in FIG.

Anchor bolts 21 set on both sides of the bottom haunch part of the concrete floor slab or block separated from the bridge girder 2.
Is set, the bridge girder 2 and the haunch portion 1a are connected by a leaf spring 22, and the bolt is tightened and fixed. A wedge 23 or the like made of a hard material is inserted into the gap formed by cutting. When removing it, the temporary connection is released.

The cut concrete block is suspended and removed by a known method, for example, using a large crane as shown in FIGS. 9 and 10.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

In the claim, since the haunch portion of the contact portion between the concrete floor slab and the bridge girder and the floor slab fixing anchor are horizontally cut, the concrete floor slab is not vertically cut on both sides along the bridge girder as in the conventional case, The floor slab and the bridge girder are separated from each other, and in the claims, a concrete block is separated from the bridge girder by cutting the width direction in the vertical direction at appropriate intervals.

Therefore, the number of cutting points on the concrete floor slab is small, and the haunch part is cut together with the floor slab anchor to separate the concrete floor slab from the bridge girder. Since the work of collecting concrete scraps can be omitted, the overall work time can be shortened, the work of crushing the residual concrete on the bridge girder is not required, and the breaker,
Since no hydraulic crusher is used, noise, vibration and dust are extremely small, and the damage to the bridge girder is minimal.
Because the anchorage of the slab anchorage is not melted by gas, adverse effects such as reverse warping of the bridge girder due to heat can be avoided.The cutting of the haunch part at the contact part between the concrete slab and bridge girder is for the horizontal direction, so stop the traffic. Since it can be carried out without any time and the time can be shortened as a whole, it has advantages such as being able to reduce the influence on general traffic.

In the claims, since the sewing wire is used as the cutting tool, the fixing anchor connecting the concrete floor slab and the bridge girder can be cut relatively easily.

In the claims, as a matter of course having the effects of claim 1, claim 2 and claim 3, the concrete and floor slab fixing anchors are cut by the operation of the drive device, and the drive device moving rail is provided. As a result, the cutting can be continued while moving the driving device as the cutting progresses, and the direction of the sawing wire can be changed by the pulley, so that the lower surface of the floor slab can be effectively used.

In the claims, since the separated concrete floor slab or concrete block and the bridge girder are temporarily connected, safe traffic opening is possible.

[Brief description of drawings]

1 to 3 are schematic views showing an embodiment in cutting a concrete floor slab, FIG. 1 is a side view, FIG. 2 is a plan view, and FIG. 3 is a sectional view taken along line AA of FIG. , FIG. 4 is a schematic perspective view illustrating a floor slab fixing anchor, and FIGS. 5 and 6 are
FIG. 5 is a schematic view showing an embodiment of a sewing wire, FIG. 5 is a plan view, FIG. 6 is a cross-sectional view, FIG. 7 is a schematic view showing an embodiment in cutting using a disc blade, and FIG. ,
Schematic diagrams showing an example of temporary connection after cutting, FIGS. 9 and 10 are schematic diagrams showing an example of a procedure for removing a concrete floor slab, and FIG. 9 is a schematic diagram in the width direction, FIG. 10 is a schematic view in the longitudinal direction, and FIGS. 11 to 14 are schematic views showing a conventional example. In the drawings, 1 is a concrete floor slab, 1a is a haunch part, 2 is a bridge girder, 3 is a floor slab fixing anchor, 4 is a sewing wire, 5 is a direction changing pulley, 6 is a driving device, 7 is a driving device moving rail, and 8 is Insertion hole, 14 is a disk-shaped blade,
Reference numeral 16 is a drive device, and 17 is a drive device moving rail.

 ─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-62-45804 (JP, A) JP-A-62-55306 (JP, A) JP-A-63-151791 (JP, A) JP-A-60- 162602 (JP, A)

Claims (10)

[Claims] 1. A method for removing a bridge slab, which comprises cutting a concrete floor slab from a bridge girder by horizontally cutting a haunch part at a contact portion between the concrete slab and the bridge girder and a floor slab fixing anchor. 2. The concrete floor slab is separated from the bridge girder by horizontally cutting the haunch portion at the contact portion between the concrete floor slab and the bridge girder and the floor plate anchor, and the separated concrete slab is removed. Bridge bridge slab removal method. 3. A concrete block separated from the bridge girder is obtained by horizontally cutting the haunch part at the contact portion between the concrete floor slab and the bridge girder and the floor slab fixing anchor and cutting the width direction up and down. A method of removing bridge decks, characterized by removing from the bridge girder. 4. A haunch portion at a contact portion between a concrete floor slab and a bridge girder and a floor slab fixing anchor are horizontally cut using a sawing wire.
Method of removing bridge deck slab as described in paragraph. 5. The method according to claim 1, 2 or 3, wherein the haunch portion of the contact portion between the concrete floor slab and the bridge girder and the floor slab fixing anchor are horizontally cut using a disc blade. Bridge floor slab removal method. 6. A drive device in which a sewing wire is arranged along a cutting line direction between a haunch part and a bridge girder, and direction change is performed by using direction changing pulleys provided on the both sides of the haunch part in the cutting line direction. It guides rotatably in the endless form to the rotating body of the drive device that moves via the moving rail,
This sawing wire is rotated by the rotation of the rotating body, and the driving device is moved through the driving device moving rail, whereby the haunch part and the floor slab fixing anchor are cut horizontally by the sewing wire and the width direction is changed vertically. Cut into concrete blocks,
A method for removing a bridge deck characterized by removing a concrete block separated from the bridge girder from the bridge girder. 7. The haunch part at the contact portion between the concrete floor slab and the bridge girder and the floor slab fixing anchor are horizontally cut, the concrete floor slab is separated from the bridge girder, and the separated concrete floor slab and bridge girder are temporarily provisionally connected. After removing the temporary connection, the concrete floor slab is removed from the bridge girder. 8. A horizontal cutting of the haunch part of the contact portion between the concrete floor slab and the bridge girder and the floor anchoring anchor is performed, and the cut concrete floor slab and the bridge girder are temporarily connected, and then the width direction is changed vertically. A method for removing a bridge deck, which is characterized in that the concrete block is cut off into a concrete block, the temporary connection is released, and then the concrete block is removed from the bridge girder. 9. The bridge floor according to claim 7 or 8, wherein the temporary connection between the cut concrete floor slab or concrete block and the bridge girder is performed by a support metal member for connecting and fixing leaf springs with anchor bolts. Plate removal method. 10. A concrete floor slab or a concrete block separated from a bridge girder is removed by being carried out by a hanging method, claim 1, claim 2, claim 3, claim 6, claim 7, or claim 8. The method for removing the bridge slab described in paragraph.