JPH0643685B2 - Horizontal cutting method of bridge deck - 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. The present invention relates to a horizontal cutting method of a bridge slab 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 up and down along the bridge girder with a concrete cutter as shown in Fig. 13, and at appropriate intervals in the longitudinal direction either before or after. The width direction is also cut in the vertical direction to form a concrete block, and as shown in FIG. 14, the cut concrete block is suspended and removed using a large crane or the like. After removing the concrete block, as shown in FIG. 15, 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. After that, as shown in FIG. 16, the floor slab fixing anchor is cut by a gas cutter or the like, and the floor slab crushed waste is 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 provides the horizontal hunch portion of the contact portion between the concrete floor slab of the bridge and the bridge girder suitable for the method for removing the bridge floor slab with low pollution and economical efficiency, as described below. It is intended to provide a directional cutting method.

[Structure of Invention]

(Means for solving the problem) The concrete block is made by cutting the haunch part at the contact part between the concrete floor slab and the bridge girder and the floor slab fixing anchor horizontally and cutting the width direction vertically. The above problem is solved by removing the more separated concrete block. Specifically, it is provided in the direction perpendicular to the bridge axis according to the cutting height of the haunch part at the contact part between the concrete deck and the bridge girder. The sewing wire is inserted through the insertion hole, and this sewing wire is provided on the driving machine supported by each of a pair of driving machine holding traveling rails mounted in the bridge axial direction on both sides of the bridge girder that contacts the bridge girder. It is hung on the rotating body of the sewing wire to make it endless, and this sewing wire is rotated by the rotation of the rotating body to drive it. By driving the driving machine on the machine holding traveling rail, the haunch part and the floor slab fixing anchor are horizontally cut by the sawing wire.

(Operation) In the above configuration, the concrete floor slab is cut horizontally along with the floor slab anchoring anchor in the haunch portion of the contact portion between the concrete floor slab and the bridge girder, and is easily cut vertically in the width direction. A concrete block that is easy to remove is formed.

Horizontal cutting is performed using a sawing wire, which is movably supported on each of a pair of drive machine holding traveling rails attached to the undersides of the floor slabs on both sides in the girder direction of the haunch portion that contacts the bridge girder. It is performed by the rotation of the driving machine, and the driving machine travels on the driving machine holding traveling rail, so that the cutting height in the horizontal direction of the haunch portion in contact with the bridge girder can be maintained.

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

1 to 3 are schematic explanatory views showing a cutting method, showing a side surface, a plane, and a cross section taken along 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 fixing anchor, 4 is a sewing wire, 5 is a driving machine holding traveling rail, 6 is a driving machine, 7 is a rotating body, 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. 8, a combination of a steel plate and a reinforcing bar (a), a stat 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. , A concrete block, and separate the concrete floor slab 1 and the bridge girder 2. The cutting in the horizontal direction and the cutting in the vertical direction in the width direction may be mixed.

The horizontal cutting is performed by applying the sawing wire 4 to a cutting point and moving the sawing wire 4 in the horizontal direction while rotating the sawing wire 4.

Generally used sewing wire 4 is a plurality of diamond beads 4a as shown in FIGS. 9 and 10.
It is formed endlessly through the wire 4b.

1 to 3, the sewing wire 4 is inserted into a pair of insertion holes 8 formed in a direction perpendicular to the bridge girder 2 of the haunch portion 1a of the concrete floor slab 1 so as to form an endless shape, and the haunch portion Endless by hanging on a rotating body 7 of a sewing wire 4 provided on a driving machine 6 movably supported on each of a pair of driving machine holding traveling rails 5 mounted on the undersides of concrete floor slabs on both sides in the bridge girder direction with 1a interposed therebetween. It is as a condition. Sewing wire 4
At the end of the haunch portion 1a, for example, at the expansion joint position, the end portion of the expansion joint extends along the end face thereof, is inserted into one insertion hole, and is hung on the rotating body to form an endless shape. In this embodiment, the rotating body 7 is a pulley, and the driving machine holding traveling rail 5 has a length corresponding to the cutting height of the haunch portion 1a and a length corresponding to the cutting length, and the haunch portion 1a is provided on the back surface of the concrete floor slab 1. A pair can be attached by sandwiching. Drive machine holding traveling rail 5
Is attached to the steel plate 9 and is attached to the bottom surface of the concrete floor slab by anchoring 10 the steel plate 9.
Of course, it may be attached directly. Another embodiment of how to mount the drive unit holding traveling rail 5 is shown in FIG. 4. In this embodiment, the drive unit holding traveling rail 5 is the bridge girder 2.
It is fixed by bolting 13 to the support member 11 which is attached to the bridge girder 2 by bolting 12 between them. An example of the driving machine holding traveling rail 5 is shown in FIGS. 5 to 7. The driving machine 6 is an endless sewing wire 4
It has a rotating body 7 for rotating at a cutting height of the haunch part, and is connected to a held portion 11 held by the driving machine holding traveling rail 5, and the held portion 11 is supported by the driving machine holding traveling rail 5 so as to be able to travel. Has been done.

Hydraulic power, electric power, compressed air, or the like can be used as power for traveling on the drive unit holding traveling rail 5 of the drive unit 6 and rotation of the rotating body 7, and the traveling may be performed by towing.

Then, the sewing wire 4 is inserted into the pair of insertion holes 8 and stretched over the rotating body 7 of the pair of driving machines 6 in an endless manner, and the driving machine 6 is rotated while the rotating body 7 is rotated. When running, the endless sawing wire 4 rotates under tension and cuts the inner surface of the insertion hole 8 in the traveling direction. Then, as the cutting progresses, the sawing wire 4 is kept in tension as it moves along the driving machine holding traveling rail 5 of the driving machine 6, and the cutting is further advanced in the horizontal direction, so that the concrete floor slab 1 together with the anchor 3 is fixed. Separate from bridge girder 2.

After that, using a concrete cutter or the like, the concrete blocks are cut at appropriate intervals in the width direction in the vertical direction. The vertical cutting in the width direction may be performed before the horizontal cutting, and in this case, the cutting portion may be one insertion hole 8 of the sawing wire 4.

Then, the cut concrete block is suspended and removed by a known method using, for example, a large crane as shown in FIGS. 11 and 12.

〔The invention's effect〕

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

Since the haunch part at the contact part between the concrete deck and the bridge girder and the floor anchoring anchor are horizontally cut, the concrete floor slab is not vertically cut on both sides along the bridge girder, but in the vertical direction in the width direction. The concrete block separated from the bridge girder is formed only by cutting 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.
Since there is no gas melting of the slab anchors, adverse effects such as reverse warping of bridge girder due to heat can be avoided.The cutting of the contact part between the concrete slab and bridge girder is for the horizontal direction, so without stopping the traffic. Since it can be performed and the time can be shortened as a whole, it has an advantage that the influence on general traffic can be reduced.

Further, according to the present invention, the drive machine is caused to travel on the pair of drive machine holding traveling rails attached in accordance with the horizontal cutting heights of the haunch portions on both sides in the bridge girder direction, so that the target cutting height is reliably maintained. Since the driving machine moves horizontally just below the concrete slab in the horizontal direction, it has an excellent effect that a small work space is required.

[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 cross-sectional view showing an embodiment of a drive unit holding traveling device, FIGS. 5 to 7 are examples of a drive unit holding traveling rail, and FIG. 8 is a schematic perspective view illustrating a floor slab fixing anchor. FIG. 9, FIG. 9 and FIG. 10 are schematic views showing an embodiment of the sewing wire.
The drawing is a plan view, FIG. 10 is a cross-sectional view, FIGS. 11 and 12 are schematic views showing an embodiment of removing the concrete floor slab after cutting, and FIG. 11 is a schematic view in the width direction, The figure is a schematic view in the longitudinal direction, and FIGS. 13 to 16 are schematic views showing a conventional example. In the drawing, 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 driving machine holding traveling rail, 6 is a driving machine, 7
Is a rotating body, and 8 is an insertion hole.

Claims (1)

[Claims] 1. A haunch part in which a sawing wire is inserted into an insertion hole provided in a direction perpendicular to the bridge axis according to the cutting height of the haunch part at the contact portion between the concrete floor slab and the bridge girder, and the sawing wire comes into contact with the bridge girder. The bridge girders on both sides of the bridge are attached to the pair of drive-carrying rails mounted in the axial direction of the bridge. A horizontal cutting method for a bridge floor slab, which comprises horizontally cutting the haunch portion and the floor plate fixing anchor by a sawing wire by causing the driving machine to travel on a driving machine holding traveling rail.