JP6987283B1 - Deck cutting device and deck cutting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a deck cutting device compact and surely install it under a concrete deck, secure a sufficient cutting length, and facilitate horizontal cutting of a joint boundary surface between a bridge girder and a concrete deck. A floor slab cutting device CD includes a wire saw 5, a pair of wire drive units 6, a pair of guide rails 7, and a pair of guide shafts 8, and the pair of wire drive units 6 are provided. Each has a drive pulley 6a that is arranged at a height substantially equal to the joint boundary surface J and rotates horizontally, and the length of the wire saw 5 is such that there is no bending between the drive pulleys 6a in the pair of wire drive portions 6. The length of the wire saw 5 is set to be longer than the length of the wire saw 5 when it is wound in an oval ring, and the upstream portion 5a located on the upstream side of the cutting work direction Y and the downstream portion located on the downstream side of the wire saw 5 are set. The side portion 5b is arranged on the upstream side in the cutting work direction Y with respect to the pair of wire driving portions 6. [Selection diagram] Fig. 3

Description

The present invention relates to a floor plate cutting device and slab cutting how using a wire saw full waterless.

Bridges in viaducts, etc. will be repaired in a timely manner because they will deteriorate over the years and will be damaged by traffic loads larger than the design load. In addition, when the repair work is carried out, the concrete deck slab that constitutes the road surface of the bridge is removed.
As a technique for removing a concrete deck, for example, in Patent Document 1, a joint boundary surface between a bridge girder and a concrete deck is horizontally cut by an anhydrous wire saw that does not use cooling water, and the concrete deck is cut into appropriate blocks. The technology for dismantling and removing concrete is disclosed.

Japanese Unexamined Patent Publication No. 2013-194495

By the way, since the wire drive device for driving the wire saw is installed on the upper surface of the concrete deck, road regulation is performed during the removal work of the concrete deck. However, it is difficult to completely close the road until the concrete deck removal work is completed, so the concrete deck removal work will be carried out intermittently for a long period of time, prolonging the construction period. May be invited.
Therefore, in recent years, a technique has been developed in which a wire drive device is installed under the concrete deck and the joint boundary surface of the concrete deck is horizontally cut while the vehicle is allowed to pass. However, below the concrete deck, there are many obstacles such as braces being erected between bridge girders, and there are problems such as difficulty in installing a wire drive device and difficulty in securing a sufficient cutting length.
The present invention has been made in view of the above circumstances, and the problems thereof are that the deck cutting device can be made compact and can be reliably installed under the concrete deck, and a sufficient cutting length can be secured, and the bridge girder and the concrete floor can be secured. This is to facilitate horizontal cutting of the joint interface with the plate.

The invention according to claim 1 is a deck slab that is laid on a bridge girder and is arranged below a concrete deck that constitutes a road surface of a bridge, and cuts a joint boundary surface between the concrete deck and the bridge girder to be cut. In the cutting device
A wire saw arranged in the direction along the joint interface and
A pair of wire drive units that drive the wire saw to run,
A pair of guide rails arranged along the extending direction of the bridge girder to be cut and the wire driving unit traveling and moving along the length direction.
A pair of guide shafts arranged along both side edges at the upper end of the bridge girder to be cut and parallel to the guide rail and in contact with the lower surface of the wire saw are provided.
Each of the pair of wire drive units has a drive pulley around which the wire saw is wound and which is arranged at a height substantially equal to the joining boundary surface and rotates horizontally.
The length of the wire saw is set to be longer than the length of the wire saw when it is wound in an oval ring without bending between the drive pulleys in the pair of wire drive units.
Among the wire saws, the upstream side portion located on the upstream side in the cutting work direction and the downstream side portion located on the downstream side are arranged on the upstream side in the cutting work direction with respect to the pair of wire drive portions. And.

The invention according to claim 2 is a deck cutting method for cutting a joint boundary surface between a concrete floor slab and a bridge girder to be cut by the floor slab cutting device according to claim 1.
The upstream portion of the wire saw is arranged on the upstream side in the cutting work direction with respect to the pair of wire driving portions and on the upstream side in the cutting work direction of the joining boundary surface.
The downstream portion of the wire saw is arranged on the upstream side in the cutting work direction with respect to the pair of wire driving portions and on the downstream side of the joining boundary surface with respect to the upstream portion of the wire saw. death,
After that, the wire saw is driven to travel by the pair of wire drive units, and the pair of wire drive units are traveled and moved along the pair of guide rails.

The invention according to claim 3 is a deck slab that is laid on a bridge girder and is arranged below a concrete deck that constitutes a road surface of a bridge, and cuts a joint boundary surface between the concrete deck and the bridge girder to be cut. In the cutting device
A wire saw arranged in the direction along the joint interface and
A pair of wire drive units that drive the wire saw to run,
A pair of guide rails arranged along the extending direction of the bridge girder to be cut and the wire driving unit traveling and moving along the length direction.
A pair of guide shafts arranged along both side edges at the upper end of the bridge girder to be cut and parallel to the guide rail and in contact with the lower surface of the wire saw.
It is provided with a pair of fixed pulleys arranged on both side edges of the bridge girder to be cut and at the upstream end of the bridge girder to be cut in the cutting work direction.
Each of the pair of wire drive units has a drive pulley around which the wire saw is wound and which is arranged at a height substantially equal to the joining boundary surface and rotates horizontally.
The length of the wire saw is set to be longer than the length of the wire saw when it is wound in an oval ring without bending between the drive pulleys in the pair of wire drive units.
Of the wire saws, the upstream side portion located on the upstream side in the cutting work direction and the downstream side portion located on the downstream side are arranged on the upstream side in the cutting work direction with respect to the pair of wire drive units, and the wire saw is provided. The upstream portion of the wire is wound around the pair of fixed pulleys.

The invention according to claim 4 is a deck cutting method for cutting a joint boundary surface between a concrete floor slab and a bridge girder to be cut by the floor slab cutting device according to claim 3.
The upstream portion of the wire saw is wound on the upstream side of the pair of wire driving portions in the cutting work direction and around the pair of fixed pulleys.
The downstream portion of the wire saw is arranged on the upstream side in the cutting work direction with respect to the pair of wire driving portions and on the downstream side of the joining boundary surface with respect to the upstream portion of the wire saw. death,
After that, the wire saw is driven to travel by the pair of wire drive units, and the pair of wire drive units are traveled and moved along the pair of guide rails.

The invention according to claim 5 is a deck slab that is laid on a bridge girder and is arranged below a concrete deck that constitutes a road surface of a bridge, and cuts a joint boundary surface between the concrete deck and the bridge girder to be cut. In the cutting device
A wire saw arranged in the direction along the joint interface and
A wire drive unit that drives the wire saw to run,
A guide rail that is arranged along the extending direction of the bridge girder to be cut and the wire drive unit travels and moves along the length direction.
It is provided with a guide shaft that is arranged along one side edge at the upper end of the bridge girder to be cut and is arranged parallel to the guide rail and is in contact with the lower surface of the wire saw.
The wire drive unit has a drive pulley around which the wire saw is wound and which is arranged at a height substantially equal to the joining boundary surface and rotates horizontally.
The length of the wire saw is set to be longer than the length of the wire saw when arranged in an oval ring without bending in the direction orthogonal to the cutting work direction from the wire drive unit toward the bridge girder in a plan view. ,
Among the wire saws, the upstream side portion located on the upstream side in the cutting work direction and the downstream side portion located on the downstream side are arranged on the upstream side in the cutting work direction with respect to the wire driving unit. ..

The invention according to claim 6 is a deck cutting method for cutting a joint boundary surface between a concrete floor slab and a bridge girder to be cut by the floor slab cutting device according to claim 5.
The upstream portion of the wire saw is arranged on the upstream side in the cutting work direction from the wire driving unit and on the upstream side of the joining boundary surface in the cutting work direction, and further, the wire saw is provided. By arranging the downstream side portion on the upstream side in the cutting work direction from the wire driving portion and on the downstream side of the joining boundary surface on the upstream side portion of the wire saw, the wire A saw is bridged between the drive pulley and the joint interface,
After that, the wire saw is driven to travel by the wire drive unit, and the wire drive unit is traveled and moved along the guide rail.

According to the present invention, the deck cutting device can be made compact and can be reliably installed under the concrete deck, a sufficient cutting length can be secured, and the joint boundary surface between the bridge girder and the concrete deck can be easily cut horizontally. ..

It is a perspective view which shows the structure of the joint boundary surface. It is an enlarged front view which shows the structure of the deck cutting apparatus. It is a top view which shows the floor slab cutting apparatus in 1st Example. The same is a vertical sectional view. It is sectional drawing which shows an example of the case of cutting a concrete deck in a direction orthogonal to a cutting work direction. It is a top view which shows the modification of the floor slab cutting apparatus in 1st Example. It is a top view which shows the floor slab cutting apparatus in 2nd Example. It is a top view which shows the floor slab cutting apparatus in 3rd Example. The same is a vertical sectional view. It is a schematic plan view which shows the structure of the temporary enclosure for cutting a deck, (a) is a state which expanded the bellows type protective film, (b) is a state which has shrunk the bellows type protective film. FIG. 10 is a vertical sectional front view of the temporary enclosure for cutting the floor slab of FIG. It is a vertical sectional front view which shows the reference example of the deck cutting apparatus and the temporary enclosure for deck cutting.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, although the embodiments described below are provided with various technically preferable limitations for carrying out the present invention, the technical scope of the present invention is not limited to the following embodiments and illustrated examples. No.

<First Embodiment>
In FIG. 1, reference numeral 1 indicates a bridge. The bridge 1 is, for example, a viaduct on which a railway or a road is constructed, and the bridge 1 in the present embodiment refers to a viaduct on which a road is constructed.
The bridge 1 which is a viaduct includes a plurality of bridge girders 2 erected between piers (not shown) and a concrete deck 3 laid on the plurality of bridge girders 2 to form the road surface of the bridge 1. A concrete wall railing column 1a is integrally provided on the side edge of the concrete deck 3.
Although the bridge 1 in the present embodiment is a viaduct, the present invention is not limited to this, and other types of bridges may be adopted as long as the gist of the present invention is not deviated.

The plurality of bridge girders 2 are provided with reinforcing materials for improving the connecting strength between the plurality of bridge girders 2 and improving the strength of the bridge 1 itself. Examples of such a reinforcing material include a reinforcing beam 4a horizontally bridged between a plurality of bridge girders 2, a vertical brace 4b arranged in the vertical direction, a horizontal brace 4c arranged in the horizontal direction, and the like.
As shown in FIG. 3 and the like, a plurality of reinforcing beams 4a and vertical braces 4b are provided at intervals in the extending direction of the plurality of bridge girders 2. Therefore, the bridge 1 is in a state of being separated along the extending direction by these reinforcing beams 4a and the vertical brace 4b.

The concrete deck 3 has a haunch portion 3a that bulges downward as a portion that rests on the upper surface of the bridge girder 2, and when the bridge 1 is constructed, the haunch portion 3a is provided so as to project on the upper surface of the bridge girder 2. It is formed by casting concrete so as to include a gibber 2a (for example, a stud gibber with a head). Therefore, the concrete deck 3 is in a state of being joined to the bridge girder 2 via a plurality of gibber 2a. The surface where the bridge girder 2 and the concrete deck 3 are joined together in this way is referred to as a joint boundary surface J.

The concrete deck 3 constitutes the road surface of the bridge 1 as described above, and many vehicles normally pass therethrough. Therefore, the bridge repair work is carried out in a timely manner according to the deterioration over time or the damage caused by the traffic load larger than the design load.
Since the bridge repair work is often carried out in a long section along the extending direction of the bridge 1, the concrete deck 3 in the planned repair work section is divided into a plurality of areas (planned dismantling points) and dismantled / removed. Work is done.
In this embodiment, it is assumed that the bridge repair work is carried out so that the bridge 1 is not closed as much as possible.

The concrete deck 3 is separated from the bridge girder 2 by cutting the joint boundary surface J together with the above-mentioned gibber 2a by the deck cutting device CD (CD1, CD2, CD3) in the present embodiment. Then, the concrete deck 3 is disassembled into a plurality of pieces and sequentially so as to have a size that can be loaded on the transportation vehicle.

As shown in FIG. 2, the floor slab cutting device CD in the present embodiment is basically configured to include at least a wire saw 5, a wire drive unit 6, a guide rail 7, and a guide shaft 8. There is. A fixed pulley 9 (described later) for smoothing the running of the wire saw 5 may be added to this basic configuration.

The wire saw 5 is an anhydrous wire saw that is driven by a wire drive unit 6 and can be made endless by connecting one end and the other end. Then, by rotating such a wire saw 5 at high speed with a constant tension applied, the joint boundary surface J can be cut together with the gibber 2a.
Further, the endless wire saw 5 is arranged in a loop shape when viewed in a plan view.

When arranging the wire saw 5 so that the joint boundary surface J can be cut together with the gibber 2a, it is necessary to pass the wire saw 5 between one side and the other side with the bridge girder 2 to be cut sandwiched between them. Therefore, an insertion hole Jh for passing the wire saw 5 is formed in the joint boundary surface J (haunch portion 3a).

The wire drive unit 6 drives the wire saw to travel, and has a drive pulley 6a and a main body device unit 6b.

The drive pulley 6a is a pulley that is arranged at a height substantially equal to the joint boundary surface J and rotates horizontally. A groove into which the wire saw 5 is inserted is formed along the outer peripheral end surface, and the wire saw 5 is wound around the drive pulley 6a so as to be inserted into the groove.

The main body device unit 6b rotates and drives the drive pulley 6a and drives the drive pulley 6a to travel along the guide rail 7.
More specifically, the holding portion 60 for holding the drive pulley 6a in a rotatable state, the first motor 61 for rotating the drive pulley 6a, and the guide rail 7 in a state where the drive pulley 6a can be driven along the guide rail 7 It has an engaging portion 62 to be engaged, and a second motor 63 for driving the engaging portion 62 to travel along the guide rail 7.
The engaging portion 62 in the present embodiment includes upper and lower wheels provided above and below the guide rail 7 to hold the guide rail 7, and wheel holding portions for holding the upper and lower wheels. Wheels are configured to be rotated by a second motor 63.

The guide rail 7 is arranged along the extending direction of the bridge girder 2 to be cut, and the wire driving unit 6 travels and moves along the length direction. Have.

The rail body 7a is formed in a shape in which the engaging portion 62 of the wire driving portion 6 can be reliably engaged and the engaging portion 62 can be reliably driven to travel.
Specifically, ridges 70 are formed at the upper and lower ends of the wire drive portion 6 side end of the rail body 7a. The upper and lower wheels of the engaging portion 62 in the wire driving portion 6 are hooked on the upper and lower ridges 70, respectively. The upper and lower wheels exert a sufficient frictional force by securely engaging with the upper and lower ridges 70, and are rotated by the second motor 63 without idling.

The rail holding portion 7b holds the rail main body 7a, and is attached to the lower surface of the stiffener 2b or the concrete deck 3 in the bridge girder 2.
When attached to the stiffener 2b, the proximal end is attached by a clamp, as shown in FIG. When attached to the lower surface of the concrete deck 3, it is anchored.

The guide rail 7 may be treated as one long rail body 7a by making the plurality of rail bodies 7a continuous in the length direction.

The guide shaft 8 is arranged along both side edges at the upper end of the bridge girder 2 to be cut and is arranged in parallel with the guide rail 7 and is in contact with the lower surface of the wire saw 5. More specifically, the wire saw 5 is in contact with the lower surface of a portion of the wire saw 5 that protrudes from both side edges at the upper end of the bridge girder 2 to be cut.
By providing such a guide shaft 8, it is possible to guide the traveling drive of the wire saw 5 while surely suppressing the bending of the wire saw 5 that relaxes as the cutting work progresses. As a result, since the levelness of the wire saw 5 can be ensured, the cutting work of the joint boundary surface J can be performed accurately, and the upper end portion (upper flange) of the bridge girder 2 is damaged by the wire saw 5. Can be prevented.

The guide shaft 8 in the present embodiment is composed of a long square pipe shaft along the guide rail 7. That is, it has a shaft main body 8a made of a square pipe shaft, and a shaft holding portion 8b for holding the shaft main body 8a.
The shaft holding portion 8b is attached to the lower surface of the stiffener 2b or the concrete deck 3 in the bridge girder 2. When attached to the stiffener 2b, the base end is attached by a clamp. When attached to the lower surface of the concrete deck 3, it is anchored as shown in FIG.

In the present embodiment, the shaft body 8a of the guide shaft 8 is composed of a square pipe shaft, but the present invention is not limited to this, and the guide shaft 8 is composed of a round pipe shaft having a rotating shaft. May be good. The round guide shaft 8 is arranged so that the rotation shaft is arranged along both side edges at the upper end portion of the bridge girder 2, so that the rotation shaft 8 can rotate around the shaft according to the running of the wire saw 5. If the wire saw 5 is rotated in accordance with the running of the wire saw 5, the friction generated between the wire saw 5 and the wire saw 5 can be suppressed as much as possible, so that the wire saw 5 is less likely to be damaged or the guide shaft 8 is less likely to be damaged.

The floor slab cutting device CD has the above basic configuration.
Then, the concrete deck 3 is separated from the bridge girder 2 by cutting the joint boundary surface J together with the above-mentioned gibber 2a by the deck cutting device CD having the above basic configuration.

Hereinafter, examples of such a deck cutting device CD will be described with reference to the drawings. In the following description, common elements such as the above basic configuration and the configuration of the bridge 1 are designated by a common reference numeral, and the description thereof will be omitted or simplified. In addition, the examples and modifications listed below may be combined as much as possible.

[First Example]
First, the first embodiment will be described with reference to the drawings.
As shown in FIGS. 3 to 5, the deck cutting device CD1 in the present embodiment includes a wire saw 5, a pair of wire drive units 6, a pair of guide rails 7, and a pair of guide shafts 8. ing.
The direction indicated by the arrow Y in FIG. 3 (FIG. 6) indicates the cutting work direction (hereinafter referred to as the cutting work direction Y) of the joining boundary surface J by the wire saw 5. The wire saw 5 cuts the joint boundary surface J from the upstream side to the downstream side in the cutting work direction Y. Further, the direction represented by the bidirectional arrow XX'in FIG. 3 indicates a direction orthogonal to the cutting work direction Y in a plan view (hereinafter, orthogonal direction X).
Further, the white arrows in FIG. 3 (FIG. 6) indicate the traveling directions of the pair of wire drive units 6 and the wire saw 5. Further, an arrow not assigned a reference numeral along the wire saw 5 indicates a traveling drive direction of the wire saw 5.

The plurality of bridge girders 2 are formed long along the opposite directions of the cutting work direction Y and the cutting work direction Y, and the reinforcing beam 4a is formed along the orthogonal direction X as shown in FIGS. 3 and 4. It is bridged between multiple bridge girders 2.
The pair of wire drive units 6 are arranged so as to be adjacent to each other along the orthogonal direction X with the bridge girder 2 to be cut interposed therebetween. Further, in these pair of wire drive units 6, the drive pulleys 6a are arranged at the same height position.
The guide rail 7 and the guide shaft 8 are arranged along the opposite directions of the cutting work direction Y and the cutting work direction Y.

The length of the wire saw 5 in this embodiment is set to be longer than the length of the wire saw 5 when the wire saw 5 is wound in an oval ring without bending between the drive pulleys 6a of the pair of wire drive units 6, for example. ing.
More specifically, first, since the wire saw 5 is arranged in a loop shape when viewed in a plan view as described above, the wire saw 5 is wound around a pair of wire drive portions 6 (drive pulley 6a). In, a portion located on the upstream side of the cutting work direction Y (hereinafter, upstream side portion 5a) and a portion located on the downstream side of the cutting work direction Y (hereinafter, downstream side portion 5b) are provided. ..
The upstream portion 5a is located upstream of the pair of wire driving portions 6 in the cutting work direction Y, and is arranged on the upstream side of the joining boundary surface J in the cutting work direction Y. On the other hand, the downstream side portion 5b is arranged on the upstream side in the cutting work direction Y with respect to the pair of wire drive portions 6, and is arranged on the downstream side of the joint boundary surface J with respect to the upstream side portion 5a. That is, of the wire saws 5 wound around the pair of wire drive portions 6, both the upstream side portion 5a and the downstream side portion 5b are located on the upstream side of the pair of wire drive portions 6 in the cutting work direction Y. On top of that, the upstream side portion 5a is located on the upstream side in the cutting work direction Y with respect to the downstream side portion 5b. That is, both the upstream side portion 5a and the downstream side portion 5b can be arranged in a "<" shape (symbol <, V shape may be used) by being set to be long as described above. ..

Insertion holes Jh are formed in a portion of the joint boundary surface J through which the upstream portion 5a of the wire saw 5 is passed and a portion through which the downstream portion 5b is passed.
The upstream portion 5a of the wire saw 5 wound around the pair of wire drive portions 6 is passed through the insertion hole Jh on the upstream side, and the insertion hole Jh on the downstream side is wound around the pair of wire drive portions 6. The downstream portion 5b of the broken wire saw 5 is passed through.
Further, by moving the pair of wire drive portions 6 to the downstream side along the pair of guide rails 7, tension can be applied to the wire saw 5 (pointing to the state shown in FIG. 3). Such a state is an initial state when the cutting work is advanced by the floor slab cutting device CD1.
The insertion hole Jh is formed along the orthogonal direction X, but is not limited to this, and may be formed at an angle with respect to the orthogonal direction X in a plan view.

When the joint boundary surface J is cut by the floor slab cutting device CD1 as described above, the pair of wire drive units 6 are driven while the drive pulleys 6a of the pair of wire drive units 6 are driven (high-speed rotation). It is moved downstream along the pair of guide rails 7. The upstream portion 5a of the wire saw 5 cuts from the upstream insertion hole Jh toward the downstream insertion hole Jh, and the downstream portion 5b of the wire saw 5 is further downstream from the downstream insertion hole Jh. Make a cut towards.
At this time, both the upstream side portion 5a and the downstream side portion 5b of the wire saw 5 rotate at high speed while being guided along the pair of guide shafts 8.

When the pair of wire drive units 6 are moved downstream along the pair of guide rails 7, the reinforcing beams 4a and the vertical braces 4b hinder the progress of the pair of wire drive units 6. However, since the wire saw 5 is driven running at a position above the reinforcing beam 4a (between the reinforcing beam 4a and the lower surface of the concrete deck 3), the progress is hindered by the reinforcing beam 4a and the vertical brace 4b. No.
In such a case, the pair of wire drive portions 6 are laid from the pair of guide rails 7 located on the upstream side of the reinforcing beam 4a and the vertical brace 4b to the pair of guide rails 7 located on the downstream side. Make a replacement.

When the cutting work of the joint boundary surface J is further advanced, the upstream side portion 5a of the wire saw 5 reaches the insertion hole Jh on the downstream side. When the joint boundary surface J is cut to that position, the tension of the wire saw 5 as in the initial state cannot be maintained. Therefore, when the cutting work is continued, the most downstream position cut by the downstream portion 5b of the wire saw 5 is used as the base point. Then, the floor slab cutting device CD1 itself is replaced.
That is, the wire saw 5 is once removed, and the pair of wire drive portions 6, the pair of guide rails 7, and the pair of guide shafts 8 are moved to a position where the next cutting operation is performed and installed.
Then, the upstream portion 5a of the wire saw 5 in the next cutting operation is arranged at the most downstream position cut by the downstream portion 5b of the wire saw 5 in the previous cutting operation. Further, on the downstream side thereof, an insertion hole Jh on the downstream side in the next work is formed, and the downstream portion 5b of the wire saw 5 is passed through the insertion hole Jh. As a result, the replacement of the floor slab cutting device CD1 is completed, and the cutting work can be continued.

In this embodiment, the pair of wire drive units 6 are controlled by a control device (not shown) so as to travel and move along the pair of guide rails 7 in synchronization, but the pair of wire drive units 6 travel and move separately. It may be controlled. Further, in addition to the pair of wire drive units 6 traveling and moving separately in this way, the pair of wire drive units 6 may be slightly traveled and moved in the direction opposite to the cutting work direction Y. If controlled in this way, for example, when an event occurs in which the wire saw 5 is caught and does not drive, it is necessary to re-hook the wire saw 5 or manually correct the positions of the pair of wire drive units 6. Can be eliminated and work efficiency can be improved.
Further, the above-mentioned control device is wirelessly or wiredly connected to an operation unit possessed by a worker so as to be able to communicate with the operation unit, and can be remotely controlled from the operation unit.
Further, a plurality of cameras for monitoring the cutting work are arranged around the cutting work place. These plurality of cameras are wirelessly or wiredly connected to the above-mentioned operation unit (which shall be provided with a display unit) and / or other display devices so as to be able to communicate with each other. Therefore, images taken by a plurality of cameras can be displayed on the above-mentioned operation unit and display device. As a result, the worker can monitor the work status, and the work efficiency and safety can be ensured.

Further, the arrow A in FIG. 3 indicates the ejection direction of chips generated when the concrete floor slab 3 is cut, and in the case of the deck cutting device CD1 in the present embodiment, when the concrete floor slab 3 is cut by the upstream portion 5a. And, chips are ejected in two directions when cut by the downstream portion 5b. Therefore, it is desirable to perform dust curing in the range cut by the upstream portion 5a and the range cut by the downstream portion 5b.
The dust curing is a cover (not shown) for preventing the scattering of chips, and a hose of a dust collector 23, which will be described later, can be attached to the end of such a cover.

After the cutting work is completed to the planned position, the concrete deck 3 is cut along the orthogonal direction X by the cutter device 10 having the cutter blade 10a for anhydrous use, as shown in FIG.
Since the cutter blade 10a is substantially circular, the cutting work by the cutter device 10 cannot be performed up to the end of the orthogonal direction X. Therefore, the end portion of the concrete deck 3 in the orthogonal direction X is end-stopped by core drilling or the like (referred to as core drilling portion 3b).
By the above method, the concrete deck 3 can be disassembled into a concrete block having a size that can be loaded on a transportation vehicle. The concrete block is removed by a crane.

According to this embodiment, the deck cutting device CD1 for separating the concrete deck 3 and the bridge girder 2 includes a wire saw 5, a pair of wire drive units 6, a pair of long guide rails 7, and a pair. Since it has a simple structure including the long guide shaft 8 of the above, the deck cutting device CD1 can be made compact and can be reliably installed under the concrete deck 3. That is, in various conventionally known techniques, a wire saw is renormalized into a plurality of pulleys inside and outside the apparatus and wound up by an electric motor to cut the joint boundary surface. Therefore, the larger the number of pulleys into which the wire saw is fed, the longer the cutting length will be. The disadvantages are "It takes time and effort to assemble, disassemble, and refill the floor slab cutting device on site.", "The shape of the cutting device is large, and obstacles in the site (bridge main girder). Affects the installation conditions. " On the other hand, according to the present embodiment, the number of pulleys into which the wire saw 5 is fed is reduced as much as possible, so that the size can be reduced and the installation and diversion in the field can be simplified. Further, even if the number of pulleys is reduced as much as possible, the cutting length of the concrete deck 3 can be easily increased by lengthening the length of the wire saw 5 and the guide rail 7. Furthermore, the influence of obstacles such as the reinforcing beam 4a can be reduced.
Further, each of the pair of wire drive portions 6 has a drive pulley 6a around which the wire saw 5 is wound and is arranged at a position substantially equal to the joining boundary surface J and rotates horizontally, and the length of the wire saw 5 is long. The length is set to be longer than the length of the wire saw 5 when it is wound in an oval ring without bending between the drive pulleys 6a of the pair of wire drive portions 6, and the cutting work direction Y of the wire saw 5 is set. Since the upstream side portion 5a located on the upstream side and the downstream side portion 5b located on the downstream side are arranged on the upstream side in the cutting work direction Y with respect to the pair of wire drive portions 6, the upstream side portion in the wire saw 5 It is possible to cut the joint boundary surface J at both the 5a and the downstream side portion 5b at the same time, thereby ensuring a sufficient cutting length and horizontally cutting the joint boundary surface J between the bridge girder 2 and the concrete slab 3. It will be easier.
Further, according to the floor slab cutting method using such a floor slab cutting device CD1, the same effect can be exhibited.

(Modification example)
FIG. 6 is a modification of the first embodiment, and shows a mode in which the joint boundary surface J between the plurality of bridge girders 2 and the concrete deck 3 is simultaneously cut by the deck cutting device CD1.

In this way, when the joint boundary surface J between the plurality of bridge girders 2 and the concrete deck 3 is cut at the same time, one of the pair of wire drive units 6 (X side in the orthogonal direction X) of the wire drive unit 6 is used. The wire drive unit 6 is arranged on the outer side (X side in the orthogonal direction X) of one bridge girder 2 and the wire drive unit 6 on the other side (X'side in the orthogonal direction X) is located on the outer side (X'side in the orthogonal direction X) of the other bridge girder 2. Place in.
Further, along with the positions of the pair of wire drive portions 6, the pair of guide rails 7 are also arranged outside the plurality of bridge girders 2 (X side and X'side in the orthogonal direction X). The guide rail 7 may be attached to the stiffener 2b of the bridge girder 2 or the concrete deck 3 constituting the adjacent lane.

In this modification, the pair of guide shafts 8 are arranged along both side edges at the upper end of each bridge girder 2. However, the present invention is not limited to this, and like the pair of wire drive units 6 and the pair of guide rails 7, they may be arranged on the outside of the plurality of bridge girders 2 (X side and X'side in the orthogonal direction X). ..

Insertion holes Jh on the upstream side and the downstream side are also formed in each of the plurality of bridge girders 2, and the wire saw 5 is wound around the pair of wire drive units 6 while passing through the insertion holes Jh to the outside of the plurality of bridge girders 2. Arrange so as to rotate around the X side and the X'side in the orthogonal direction X). Then, if the wire saw 5 arranged in this way is driven by a pair of wire drive units 6, the joint boundary surface J between the plurality of bridge girders 2 and the concrete deck 3 can be cut at the same time.

Since dust curing is required at two locations for each joint boundary surface J between each bridge girder 2 and the concrete deck 3, when cutting the joint boundary surface J between the two bridge girders 2 and the concrete deck 3. Requires a total of 4 dust curing.

According to the cutting work performed by the deck cutting device CD1 having the above configuration, the joint boundary surface J between the two bridge girders 2 and the concrete deck 3 can be cut at the same time, so that each bridge girder 2 and concrete can be cut at the same time. It is more efficient than the case where the cutting work is performed for each joint interface J with the deck 3.

[Second Example]
Subsequently, the second embodiment will be described with reference to the drawings.
As shown in FIG. 7, the floor slab cutting device CD2 in the present embodiment includes a wire saw 5, a pair of wire drive units 6, a pair of guide rails 7, a pair of guide shafts 8, and a pair of fixed pulleys 9. And prepare.
In FIG. 7, the direction indicated by the arrow Y is the cutting work direction Y, the direction indicated by the bidirectional arrow X-X'is the orthogonal direction X, and the direction indicated by the arrow A is the chip ejection direction. be.

Similar to the drive pulley 6a, the pair of fixed pulleys 9 are wound with a wire saw 5 and arranged at a height substantially equal to the joining boundary surface J to rotate horizontally. Then, it is arranged on both side edges at the upper end of the bridge girder 2 to be cut and at the end on the upstream side of the cutting work direction Y in the bridge girder 2 to be cut, and the deck cutting device CD2 is replaced. Do not move from this position to another position until.

If the distance between the pair of fixed pulleys 9 is long, the length of the wire saw 5 will be excessively long. Therefore, the distance between the pair of fixed pulleys 9 when cutting the joint boundary surface J between one bridge girder 2 and the concrete deck 3 is such that the pair of fixed pulleys 9 interfere with the bridge girder 2, the concrete deck 3, and the like. It is set to be as short as possible within the range that does not occur.

The length of the wire saw 5 in this embodiment is also set to be longer than the length of the wire saw 5 when the wire saw 5 is wound in an oval ring without bending between the drive pulleys 6a of the pair of wire drive units 6, for example. There is.
More specifically, first, since the wire saw 5 is arranged in a loop shape when viewed in a plan view, the cutting operation is performed when the wire saw 5 is wound around the pair of wire drive units 6 (drive pulley 6a). It has a portion located on the upstream side of the direction Y (hereinafter, upstream side portion 5a) and a portion located on the downstream side of the cutting work direction Y (hereinafter, downstream side portion 5b).
The upstream portion 5a is arranged on the upstream side in the cutting work direction Y with respect to the pair of wire driving portions 6, and is wound around the pair of fixed pulleys. On the other hand, the downstream side portion 5b is arranged on the upstream side in the cutting work direction Y with respect to the pair of wire drive portions 6, and is arranged on the downstream side of the joint boundary surface J with respect to the upstream side portion 5a. That is, of the wire saws 5 wound around the pair of wire drive portions 6, both the upstream side portion 5a and the downstream side portion 5b are located on the upstream side of the pair of wire drive portions 6 in the cutting work direction Y. On top of that, the upstream portion 5a is wound around a pair of fixed pulleys 9. That is, both the upstream side portion 5a and the downstream side portion 5b are set to be long as described above so that they can be arranged in a "<" character (or a symbol <or a hexagonal bracket, or a V character). It has become.

An insertion hole Jh is formed in a portion of the joint boundary surface J through which the downstream portion 5b of the wire saw 5 is passed, and a wire wound around a pair of wire drive portions 6 is formed in the insertion hole Jh. The downstream portion 5b of the saw 5 is passed through.
Further, by moving the pair of wire drive portions 6 to the downstream side along the pair of guide rails 7, tension can be applied to the wire saw 5 (pointing to the state shown in FIG. 7). Such a state is an initial state when the cutting work is advanced by the floor slab cutting device CD2.

When the joint boundary surface J is cut by the floor slab cutting device CD2 as described above, the pair of wire drive units 6 are driven while the drive pulleys 6a of the pair of wire drive units 6 are driven (high-speed rotation). It is moved downstream along the pair of guide rails 7. The upstream portion 5a of the wire saw 5 does not move from the position of the pair of fixed pulleys 9, and the downstream portion 5b of the wire saw 5 cuts from the insertion hole Jh toward the downstream side.
At this time, the downstream portion 5b of the wire saw 5 rotates at high speed while being guided along the pair of guide shafts 8.

When the pair of wire drive units 6 are moved downstream along the pair of guide rails 7, the reinforcing beams 4a and the vertical braces 4b hinder the progress of the pair of wire drive units 6. The pair of wire drive units 6 are replaced.

As the cutting work of the joining boundary surface J is further advanced, the pair of wire driving portions 6 reach the downstream end portions of the pair of guide rails 7. Alternatively, the downstream portion 5b of the wire saw 5 moves to the downstream end portion of the pair of wire drive portions 6 (drive pulley 6a) in the cutting work direction Y. However, if the joint boundary surface J is cut to such a position, the cutting work cannot be continued. Therefore, when the cutting work is continued, the floor slab is set from the most downstream position cut by the downstream portion 5b of the wire saw 5. The cutting device CD2 itself is replaced.
That is, the wire saw 5 is once removed, and the pair of wire drive portions 6, the pair of guide rails 7, the pair of guide shafts 8, and the pair of fixed pulleys 9 are moved and installed at positions where the next cutting operation is performed.
Then, the pair of fixed pulleys 9 in the next cutting work are arranged at the most downstream position cut by the downstream side portion 5b of the wire saw 5 in the previous cutting work. Further, an insertion hole Jh in the next work is formed on the downstream side thereof, and the downstream portion 5b of the wire saw 5 is passed through the insertion hole Jh. As a result, the replacement of the floor slab cutting device CD2 is completed, and the cutting work can be continued.

As described above, the arrow A in FIG. 3 indicates the ejection direction of chips generated when the concrete deck 3 is cut, and in the case of the deck cutting device CD2 in this embodiment, the downstream portion 5b. Chips are ejected only when cut by. Therefore, it is possible to take measures against dust by performing dust curing only in the range cut by the downstream portion 5b.

After the cutting work is completed to the planned position, the concrete deck 3 is cut along the orthogonal direction X by the cutter device 10, and the concrete deck 3 is large enough to be loaded on the transport vehicle. Dismantle into concrete blocks.

According to this embodiment, the deck cutting device CD2 for separating the concrete deck 3 and the bridge girder 2 includes a wire saw 5, a pair of wire drive portions 6, a pair of long guide rails 7, and a pair. Since it has a simple structure including a long guide shaft 8 and a pair of fixed pulleys 9, the deck cutting device CD2 can be made compact and can be reliably installed under the concrete deck 3. That is, in various conventionally known techniques, a wire saw is renormalized into a plurality of pulleys inside and outside the apparatus and wound up by an electric motor to cut the joint boundary surface. Therefore, the larger the number of pulleys into which the wire saw is fed, the longer the cutting length will be. The disadvantages are "It takes time and effort to assemble, disassemble, and refill the floor slab cutting device on site.", "The shape of the cutting device is large, and obstacles in the site (bridge main girder). Affects the installation conditions. " On the other hand, according to the present embodiment, the number of pulleys into which the wire saw 5 is fed is reduced as much as possible, so that the size can be reduced and the installation and diversion in the field can be simplified. Further, even if the number of pulleys is reduced as much as possible, the cutting length of the concrete deck 3 can be easily increased by lengthening the length of the wire saw 5 and the guide rail 7. Furthermore, the influence of obstacles such as the reinforcing beam 4a can be reduced.
Further, each of the pair of wire drive portions 6 has a drive pulley 6a around which the wire saw 5 is wound and is arranged at a position substantially equal to the joint boundary surface J and rotates horizontally, and the length of the wire saw 5 is long. The length is set to be longer than the length of the wire saw 5 when it is wound in an oval ring without bending between the drive pulleys 6a of the pair of wire drive portions 6, and the cutting work direction Y of the wire saw 5 is set. The upstream side portion 5a located on the upstream side and the downstream side portion 5b located on the downstream side are arranged on the upstream side in the cutting work direction Y with respect to the pair of wire drive portions 6, and the upstream side portion 5a of the wire saw 5 is arranged. Since it is wound around a pair of fixed pulleys 9, the joint boundary surface J can be cut at the downstream portion 5b of the wire saw 5, whereby a sufficient cutting length can be secured, and the bridge girder 2 and the concrete slab 3 can be cut. It becomes easy to horizontally cut the joint interface J with the wire. In addition, it is not necessary to perform dust curing at the position of the upstream side portion 5a of the wire saw 5, and if dust curing is performed only in the range cut by the downstream side portion 5b, dust countermeasures can be taken. Excellent in terms of workability and cost.
Further, according to the floor slab cutting method using such a floor slab cutting device CD2, the same effect can be exhibited.

When the joint boundary surface J between the plurality of bridge girders 2 and the concrete deck 3 is cut by the floor slab cutting device CD2 in this embodiment, a pair of wire drive portions 6 and a pair of guide rails 7 are used. It is arranged on the outside of the bridge girder 2 (X side and X'side in the orthogonal direction X), and the pair of guide shafts 8 are arranged along both side edges at the upper end portion of each bridge girder 2. Further, of the pair of fixed pulleys 9, one (X side in the orthogonal direction X) fixed pulley 9 is arranged on the outer side (X side in the orthogonal direction X) of one bridge girder 2, and the other (X side in the orthogonal direction X). The fixed pulley 9 on the'side) is arranged on the outside (X'side in the orthogonal direction X) of the other bridge girder 2.
Then, an insertion hole Jh is formed in each of the plurality of bridge girders 2, and the wire saw 5 is wound around the pair of wire drive portions 6 and the pair of fixed pulleys 9 while passing through the insertion hole Jh, so that the plurality of bridge girders 2 are formed. Arrange so as to rotate around the outside (X side and X'side in the orthogonal direction X). Then, if the wire saw 5 arranged in this way is driven by a pair of wire drive units 6, the joint boundary surface J between the plurality of bridge girders 2 and the concrete deck 3 can be cut at the same time.

[Third Example]
Subsequently, the third embodiment will be described with reference to the drawings.
As shown in FIGS. 8 and 9, the floor slab cutting device CD3 in the present embodiment includes a wire saw 5, one wire drive unit 6, one guide rail 7, one guide shaft 8, and the like. I have.
In FIG. 8, the direction represented by the arrow Y is the cutting work direction Y, and the direction represented by the bidirectional arrow X—X ′ is the orthogonal direction X.

One wire driving unit 6 is arranged at intervals in the orthogonal direction X of the bridge girder 2 to be cut. Further, one guide rail 7 is arranged at a position where the wire driving unit 6 can travel and move.
One guide shaft 8 is arranged along one side edge at the upper end portion of the bridge girder 2, and is arranged at a position closer to the bridge girder 2 to be cut than the wire drive portion 6 and the guide rail 7.

The length of the wire saw 5 in this embodiment is, for example, the length of the wire saw 5 when arranged in an oval ring without bending in a direction orthogonal to the cutting work direction Y from the wire drive unit 6 toward the bridge girder 2 in a plan view. It is set longer than the length.
More specifically, first, since the wire saw 5 is arranged in a loop shape when viewed in a plan view, the cutting work direction Y in the state of being wound around the wire drive unit 6 (drive pulley 6a). It has a portion located on the upstream side (hereinafter, upstream side portion 5a) and a portion located on the downstream side in the cutting work direction Y (hereinafter, downstream side portion 5b).
Further, in the joint boundary surface J, an insertion hole Jh is formed in a portion through which the upstream side portion 5a of the wire saw 5 is passed and a portion through which the downstream side portion 5b is passed. The upstream portion 5a of the wire saw 5 wound around the wire drive portion 6 is passed through the insertion hole Jh on the upstream side, and the wire saw 5 wound around the wire drive portion 6 is passed through the insertion hole Jh on the downstream side. The downstream part 5b is passed through.
That is, the wire saw 5 is bridged and arranged between the wire driving unit 6 and the joint boundary surface J.
On top of that, both the upstream side portion 5a and the downstream side portion 5b of the wire saw 5 are arranged on the upstream side of the wire driving portion 6 in the cutting work direction Y. Then, by moving the wire drive unit 6 to the downstream side along the guide rail 7, tension can be applied to the wire saw 5 (pointing to the state shown in FIG. 8). Such a state is an initial state when the cutting work is advanced by the floor slab cutting device CD3.

When the joint boundary surface J is cut by the floor slab cutting device CD3 as described above, the wire drive unit 6 is moved to the guide rail 7 while the drive pulley 6a in the wire drive unit 6 is driven (high-speed rotation). Travel along the downstream side. The upstream portion 5a of the wire saw 5 cuts from the upstream insertion hole Jh toward the downstream insertion hole Jh, and the downstream portion 5b of the wire saw 5 is further downstream from the downstream insertion hole Jh. Make a cut towards.
At this time, both the upstream side portion 5a and the downstream side portion 5b of the wire saw 5 rotate at high speed while being guided along the guide shaft 8.

When the wire drive unit 6 is moved downstream along the guide rail 7, the reinforcing beam 4a and the vertical brace 4b hinder the progress of the wire drive unit 6, so that the wire drive unit 6 is built. Make a replacement.

When the cutting work of the joining boundary surface J is further advanced, the upstream side portion 5a of the wire saw 5 reaches the insertion hole Jh on the downstream side. If the joint boundary surface J is cut to that position, the tension of the wire saw 5 as in the initial state cannot be maintained. Therefore, when the cutting work is continued, the most downstream position cut by the downstream portion 5b of the wire saw 5 is used as the base point. Then, the floor slab cutting device CD3 itself is replaced.

After the cutting work is completed to the planned position, the concrete deck 3 is cut along the orthogonal direction X by the cutter device 10, and the concrete deck 3 is large enough to be loaded on the transport vehicle. Dismantle into concrete blocks.

According to this embodiment, the deck cutting device CD3 for separating the concrete deck 3 and the bridge girder 2 includes a wire saw 5, one wire drive unit 6, one guide rail 7, and one. Since the structure is simple with the guide shaft 8, the deck cutting device CD3 can be made compact and can be reliably installed under the concrete deck 3. That is, in various conventionally known techniques, a wire saw is renormalized into a plurality of pulleys inside and outside the apparatus and wound up by an electric motor to cut the joint boundary surface. Therefore, the larger the number of pulleys into which the wire saw is fed, the longer the cutting length will be. The disadvantages are "It takes time and effort to assemble, disassemble, and refill the floor slab cutting device on site.", "The shape of the cutting device is large, and obstacles in the site (bridge main girder). Affects the installation conditions. " On the other hand, according to the present embodiment, the number of pulleys into which the wire saw 5 is fed is reduced as much as possible, so that the size can be reduced and the installation and diversion in the field can be simplified. Further, even if the number of pulleys is reduced as much as possible, the cutting length of the concrete deck 3 can be easily increased by lengthening the length of the wire saw 5 and the guide rail 7. Furthermore, the influence of obstacles such as the reinforcing beam 4a can be reduced.
Further, the wire drive unit 6 has a drive pulley 6a around which the wire saw 5 is wound and which is arranged at a height substantially equal to the joint boundary surface J and rotates horizontally. In a plan view, the wire saw 5 is set to be longer than the length of the wire saw 5 when arranged in an oval ring without bending in the direction orthogonal to the cutting work direction Y from the wire drive unit 6 toward the bridge girder 2. Since the upstream side portion 5a located on the upstream side of the cutting work direction Y and the downstream side portion 5b located on the downstream side are arranged on the upstream side of the cutting work direction Y with respect to the wire driving unit 6, the wire saw 5 is used. It is possible to cut the joint boundary surface J at both the upstream side portion 5a and the downstream side portion 5b at the same time, whereby a sufficient cutting length can be secured, and the joint boundary surface J between the bridge girder 2 and the concrete slab 3 can be formed. It becomes easier to cut horizontally.
Further, according to the floor slab cutting method using such a floor slab cutting device CD3, the same effect can be exhibited.

When cutting the joint boundary surface J between the plurality of bridge girders 2 and the concrete deck slab 3 by the floor slab cutting device CD3 in this embodiment, an insertion hole Jh is formed in each of the plurality of bridge girders 2 and a wire saw. 5 is wound around the wire drive unit 6 while passing through the insertion hole Jh, and is arranged so as to rotate around the outside of the plurality of bridge girders 2 (X side and X'side in the orthogonal direction X). Then, if the wire saw 5 arranged in this way is driven by the wire drive unit 6, the joint boundary surface J between the plurality of bridge girders 2 and the concrete deck 3 can be cut at the same time. Further, the guide shaft 8 is arranged along the inner edge of the upper end portion of the plurality of bridge girders 2 (the edge portion on the deck cutting device CD3 side).

<Second Embodiment>
10 and 11 show the configuration of the temporary enclosure 20 for cutting the floor slab (hereinafter, temporary enclosure 20), where reference numeral 21 is a bellows type protective film, reference numeral 22 is a traveling portion, and reference numeral 23 is a dust collector. Reference numeral 24 is a lighting device, and reference numeral 25 is a ventilation device.
As shown in the figure, the temporary enclosure 20 is an all-weather, soundproof and dustproof type, and the floor slab cutting device CD (CD1, CD2, CD3) for cutting the joint boundary surface J between the concrete floor slab 3 and the bridge girder 2 is provided. When placed below the concrete deck 3, the deck cutting device CD covers the upper part and the sides of the concrete deck 3 in the portion placed below.
Such a temporary enclosure 20 includes a bellows type protective film 21, a traveling unit 22, a dust collector 23, a lighting device 24, and a ventilation device 25.

The bellows type protective film 21 is configured to be able to expand and contract along the longitudinal direction of the concrete deck 3. That is, a plurality of frames formed in an arch shape are connected by a film body in the longitudinal direction of the concrete deck 3. Then, as shown in FIGS. 10A and 10B, the film body expands when the plurality of frames are separated from each other, and the film body is folded and contracted when the plurality of frames are close to each other.
Further, the bellows type protective film 21 covers the upper side and the side surface (outside of the wall height column 1a on both the left and right sides) of the concrete floor slab 3, but as shown in FIG. 11, it covers the side surface of the concrete floor slab 3. The lower end portion of the portion is arranged so as to wrap around below the concrete deck 3. That is, the lower ends of the plurality of frames constituting the bellows type protective film 21 are formed in a substantially L shape so as to be bent toward the bridge girder 2. The lower end of the bellows type protective film 21 is located at least below the drive pulley 6a so as not to interfere with the operation of the deck cutting device CD. The above-mentioned surveillance camera may be provided at the lower end of the bellows type protective film 21.

The traveling portion 22 moves the bellows type protective film 21 in the longitudinal direction along the concrete deck 3, and has legs attached to both ends of several frames among the plurality of frames, and the legs. It has a tire provided at the lower end portion of the portion. That is, the bellows type protective film 21 is supported on the concrete deck 3 by the traveling portion 22, and can be moved on the concrete deck 3 by the tire.
The tire in this embodiment is configured to be driveable by an electric motor (not shown). The electric motor is controlled by a control device (not shown), and the electric motor attached to each tire can be driven individually or synchronously. As a result, even a bridge 1 having a straight portion and a curved portion can be supported. That is, if it is a straight portion, all the tires may be driven, and if it is a curved portion, the tires outside the curve may be moved more than inside the curve.
Further, the above-mentioned control device is wirelessly or wiredly connected to an operation unit possessed by a worker so as to be able to communicate with the operation unit, and can be remotely controlled from the operation unit.
Although the tire in the present embodiment can be driven by an electric motor, the bellows type protective film 21 may be moved by hand by a worker.

The dust collector 23 is a device that collects dust from the bellows-type protective film 21, and is installed in the bellows-type protective film 21. The number may be plural or one depending on the performance. In the present embodiment, it is installed so as to be able to run on the concrete deck 3 while being mounted on the carriage 23a. The carriage 23a may be connected to the legs of the traveling portion 22 and move with the movement of the bellows type protective film 21, or may be moved separately without being connected to the legs of the traveling portion 22. Further, the dust collector 23 in the present embodiment is arranged on the concrete deck 3 close to the roadside zone (wall height column 1a side) of the bridge 1.
The dust collector 23 can be used by extending a hose (pipe) from the main body. The hose may be routed under the concrete deck 3 from the outside of the wall railing column 1a, or a through hole may be formed in the concrete deck 3 and routed under the concrete deck 3 from the through hole. That is, the hose of the dust collector 23 is drawn into the lower surface of the concrete deck 3, and the tip thereof is arranged in the vicinity of the wire saw 5. Then, the chips generated during the cutting work of the concrete deck 3 are collected.

A plurality of lighting devices 24 are installed in the bellows type protective film 21. In the present embodiment, the bellows-type protective film 21 is attached to a plurality of frames and moves with the movement of the bellows-type protective film 21.

The ventilation device 25 ventilates the air in the bellows type protective film 21, and is installed in the bellows type protective film 21. The number may be plural or one depending on the performance. In the present embodiment, it is attached to the leg portion of the traveling portion 22 and moves with the movement of the bellows type protective film 21. Further, although the ventilation device 25 in the present embodiment is provided on the center side of the bridge 1 in the legs, it may be provided on the wall height column 1a side in the legs, or it may be provided on the roadside zone of the bridge 1 and the concrete floor. It may be provided on the plate 3. Further, similarly to the lighting device 24, it may be attached to the frame of the bellows type protective film 21.

The temporary enclosure 20 configured as described above covers the upper side of the concrete deck 3 constituting the two-lane bridge 1 and both sides of the left and right wall railings 1a by the bellows type protective film 21. Not limited. For example, by further providing a traveling portion 22 located on the center line, the bending of the frame of the bellows type protective film 21 is suppressed so as to cover the upper side and the left and right sides of the concrete deck 3 constituting the four-lane bridge 1. You may. Further, the traveling portion 22 located on the center line and the traveling portion 22 located on the wall height column 1a side on one side may cover the upper side and one side of the concrete deck 3 for one lane on each side. ..
Such a temporary enclosure 20 can cover the upper side and the side of the concrete deck 3 to be cut by, for example, the deck cutting device CD. For example, it is possible to cut and remove the entire cross section with a width of 2 m, and it can be carried out by a trailer or the like, and it can also be used for night work in a two-shift system.

Further, as shown in FIG. 11, the temporary enclosure 20 in the present embodiment may be provided with a steady rest 26 in contact with the lower surface of the concrete deck 3. The steady rest 26 is provided at the lower end portion of the frame of the bellows type protective film 21. Such a steady rest 26 is provided as necessary on a windy day or when there is a concern that the bellows-type protective film 21 may be agitated by the wind pressure of a vehicle passing through the bellows-type protective film 21. It shall be.

The lower protective suspension scaffold 16 is arranged from the side of the concrete deck 3 to be dismantled / removed from the side to the bottom, and is suspended by a suspension member such as a chain hooked on the bridge girder 2. Since the lower protective suspension scaffold 16 is arranged from the side to the lower side of the concrete deck 3, it functions as a scaffold for work and as a safety facility for the side and the lower side.
The main body of the dust collector 23 may be installed on the lower protective suspension scaffold 16.

The bridge may be perforated with through holes that penetrate the concrete deck in the thickness direction.
For example, the haunch portion 3a may not exist in the concrete deck 3, and the above-mentioned insertion hole Jh cannot be formed. In such a case, it is necessary to form an opening groove for passing the upstream side portion 5a and the downstream side portion 5b of the wire saw 5 through the concrete deck 3. The opening groove is formed to be longer than the width dimension (dimension in the orthogonal direction X) of the upper surface of the bridge girder 2.
Further, when the hose of the dust collector 23 is routed from above to below the concrete deck 3 as described above, it is necessary to form a through hole in the concrete deck 3.
Further, since the joint portion of the plurality of bridge girders 2 may be provided with splicing plates and bolts to complicate the structure, the joint portion may be exposed prior to the cutting work of the joint boundary surface J. Even in such a case, it is necessary to form an opening for exposing the joint portion through the concrete deck 3.
As described above, since the bridge 1 may have a through hole penetrating the concrete deck 3 in the thickness direction, rainwater may flow into the lower surface side of the concrete deck 3. When rainwater enters the cut portion below the concrete deck 3, the chips generated when the concrete deck 3 is cut and attached to the wire saw 5 may be formed into dumplings due to the rainwater. When such a phenomenon occurs, the friction at the time of cutting the concrete deck 3 becomes large, and it may be difficult to horizontally cut the joint boundary surface J between the bridge girder 2 and the concrete deck 3.
In Japan, construction is often interrupted due to the rainy season and the effects of typhoons, which may reduce work efficiency and extend the process.
On the other hand, according to the present embodiment, the all-weather type temporary deck cutting enclosure 20 may cover the upper side and the side of the concrete deck 3 in the portion where the deck cutting device CD is arranged below. can. Further, since the bellows type protective film 21 can be expanded and contracted as needed, it becomes easy to prevent rainwater from entering the lower surface side of the concrete deck 3, and as a result, the joint boundary between the bridge girder 2 and the concrete deck 3 is formed. The surface J can be easily cut horizontally. Moreover, since the temporary enclosure 20 for cutting the floor slab has a traveling portion 22 for moving the bellows type protective film 21 in the longitudinal direction along the concrete floor slab 3, the floor slab corresponding to the replacement of the floor slab cutting device CD. The temporary enclosure 20 for cutting can be easily moved. Furthermore, depending on the diameter of the through hole that penetrates the concrete deck 3 in the thickness direction and the condition of obstacles, vehicles on the concrete deck 3 can pass through. It will be possible to carry out construction. Further, if the all-weather type floor slab cutting temporary enclosure 20 as in the present embodiment is installed, the influence in rainy weather can be reduced.

If the dust collector 23 (or hose) must be moved according to the traveling drive of the wire saw 5, the traveling drive of the wire saw 5 and the movement by the traveling unit 22 of the temporary enclosure 20 are synchronized and interlocked. You may let it.

(Reference example)
In the following, when the floor slab cutting device CD4 for the concrete floor slab 3 is arranged on the concrete floor slab 3, the portion where the floor slab cutting device CD4 is arranged on the upper surface is the floor slab in the present embodiment. A reference example for covering with the temporary cutting enclosure 20 will be described. In the following description, the elements common to the above description will be designated by a common reference numeral, and the description will be omitted or abbreviated.

The deck cutting device CD4 arranged on the concrete deck 3 is completely extended in the direction along the joint boundary surface J between the bridge girder 2 and the concrete deck 3 and in the width direction and the thickness direction of the concrete deck 3. It has an anhydrous wire saw 5 and a plurality of pulleys for guiding and driving the wire saw 5 in the traveling direction along the extension path thereof, and the concrete deck 3 is provided by the wire saw 5. Is for cutting in the direction along the joint boundary surface J between the bridge girder 2 and the concrete deck 3 and in the width direction and the thickness direction of the concrete deck 3 to be disassembled into a block shape.
As shown in FIG. 12, the main body of the deck cutting device CD4 is composed of a first device CD4a and a second device CD4b each having a plurality of pulleys including a drive pulley, and the wire saw 5 Is driven by a main body including these two devices CD4a and CD4b. Since the two devices CD4a and CD4b are used in this way, it is possible to drive the wire saw 5 long enough to extend in the direction along the joint boundary surface J and in the width direction and thickness direction of the concrete deck 3. can.

The temporary fence 20 for cutting the deck (hereinafter referred to as the temporary fence 20) covers the upper side of the concrete deck 3 provided with the deck cutting device CD4 as described above and the sides of the left and right wall railings 1a.
Since the temporary enclosure 20 in this reference example has the same configuration as the temporary enclosure 20 described in the second embodiment, it exhibits the same effect as that of the second embodiment. Further, Patent No. 6758787 discloses an embodiment similar to this reference example as a mobile factory, but this reference example is easier to use than the embodiment related to the mobile factory in Japanese Patent No. 6758787. good.

In the case of this reference example, since the floor slab cutting device CD4 is provided on the concrete floor slab 3, it is necessary to block the traffic of vehicles. Therefore, the temporary enclosure 20 may be provided with an opening film that covers the opening of the bellows type protective film 21. By covering the opening with the opening membrane, it is possible to prevent rainwater from entering from the opening, so that the joint interface J between the bridge girder 2 and the concrete deck 3 can be easily cut horizontally even in rainy weather.

CD Deck cutting device J Joint boundary surface Jh Insertion hole Y Cutting work direction X Orthogonal direction 1 Bridge 2 Bridge girder 2a Jibel 3 Concrete deck 3a Haunch part 4a Reinforcing beam 4b Vertical brace 5 Wire saw 5a Upstream part 5b Downstream part 6 Wire drive 6a Drive pulley 7 Guide rail 8 Guide shaft 9 Fixed pulley

Claims (6)

In a deck cutting device that is laid on a bridge girder and is placed below a concrete deck that constitutes the road surface of a bridge and cuts a joint boundary surface between the concrete deck and the bridge girder to be cut.
A wire saw arranged in the direction along the joint interface and
A pair of wire drive units that drive the wire saw to run,
A pair of guide rails arranged along the extending direction of the bridge girder to be cut and the wire driving unit traveling and moving along the length direction.
A pair of guide shafts arranged along both side edges at the upper end of the bridge girder to be cut and parallel to the guide rail and in contact with the lower surface of the wire saw are provided.
Each of the pair of wire drive units has a drive pulley around which the wire saw is wound and which is arranged at a height substantially equal to the joining boundary surface and rotates horizontally.
The length of the wire saw is set to be longer than the length of the wire saw when it is wound in an oval ring without bending between the drive pulleys in the pair of wire drive units.
Among the wire saws, the upstream side portion located on the upstream side in the cutting work direction and the downstream side portion located on the downstream side are arranged on the upstream side in the cutting work direction with respect to the pair of wire drive portions. Floor slab cutting device. A floor slab cutting method for cutting a joint boundary surface between the concrete floor slab and the bridge girder to be cut by the floor slab cutting device according to claim 1.
The upstream portion of the wire saw is arranged on the upstream side in the cutting work direction with respect to the pair of wire driving portions and on the upstream side in the cutting work direction of the joining boundary surface.
The downstream portion of the wire saw is arranged on the upstream side in the cutting work direction with respect to the pair of wire driving portions and on the downstream side of the joining boundary surface with respect to the upstream portion of the wire saw. death,
After that, the floor slab cutting method is characterized in that the pair of wire drive units are driven to travel along the pair of guide rails while the wire saw is driven to travel by the pair of wire drive units. In a deck cutting device that is laid on a bridge girder and is placed below a concrete deck that constitutes the road surface of a bridge and cuts a joint boundary surface between the concrete deck and the bridge girder to be cut.
A wire saw arranged in the direction along the joint interface and
A pair of wire drive units that drive the wire saw to run,
A pair of guide rails arranged along the extending direction of the bridge girder to be cut and the wire driving unit traveling and moving along the length direction.
A pair of guide shafts arranged along both side edges at the upper end of the bridge girder to be cut and parallel to the guide rail and in contact with the lower surface of the wire saw.
It is provided with a pair of fixed pulleys arranged on both side edges of the bridge girder to be cut and at the upstream end of the bridge girder to be cut in the cutting work direction.
Each of the pair of wire drive units has a drive pulley around which the wire saw is wound and which is arranged at a height substantially equal to the joining boundary surface and rotates horizontally.
The length of the wire saw is set to be longer than the length of the wire saw when it is wound in an oval ring without bending between the drive pulleys in the pair of wire drive units.
Of the wire saws, the upstream side portion located on the upstream side in the cutting work direction and the downstream side portion located on the downstream side are arranged on the upstream side in the cutting work direction with respect to the pair of wire drive units, and the wire saw is provided. A floor slab cutting device, characterized in that the upstream portion of the above is wound around the pair of fixed pulleys. A floor slab cutting method for cutting a joint boundary surface between the concrete floor slab and the bridge girder to be cut by the floor slab cutting device according to claim 3.
The upstream portion of the wire saw is wound on the upstream side of the pair of wire driving portions in the cutting work direction and around the pair of fixed pulleys.
The downstream portion of the wire saw is arranged on the upstream side in the cutting work direction with respect to the pair of wire driving portions and on the downstream side of the joining boundary surface with respect to the upstream portion of the wire saw. death,
After that, the floor slab cutting method is characterized in that the pair of wire drive units are driven to travel along the pair of guide rails while the wire saw is driven to travel by the pair of wire drive units. In a deck cutting device that is laid on a bridge girder and is placed below a concrete deck that constitutes the road surface of a bridge and cuts a joint boundary surface between the concrete deck and the bridge girder to be cut.
A wire saw arranged in the direction along the joint interface and
A wire drive unit that drives the wire saw to run,
A guide rail that is arranged along the extending direction of the bridge girder to be cut and the wire drive unit travels and moves along the length direction.
It is provided with a guide shaft that is arranged along one side edge at the upper end of the bridge girder to be cut and is arranged parallel to the guide rail and is in contact with the lower surface of the wire saw.
The wire drive unit has a drive pulley around which the wire saw is wound and which is arranged at a height substantially equal to the joining boundary surface and rotates horizontally.
The length of the wire saw is set to be longer than the length of the wire saw when arranged in an oval ring without bending in the direction orthogonal to the cutting work direction from the wire drive unit toward the bridge girder in a plan view. ,
Among the wire saws, the upstream side portion located on the upstream side in the cutting work direction and the downstream side portion located on the downstream side are arranged on the upstream side in the cutting work direction with respect to the wire driving unit. Floor slab cutting device. A floor slab cutting method for cutting a joint boundary surface between the concrete floor slab and the bridge girder to be cut by the floor slab cutting device according to claim 5.
The upstream portion of the wire saw is arranged on the upstream side in the cutting work direction from the wire driving unit and on the upstream side of the joining boundary surface in the cutting work direction, and further, the wire saw is provided. By arranging the downstream side portion on the upstream side in the cutting work direction from the wire driving portion and on the downstream side of the joining boundary surface on the upstream side portion of the wire saw, the wire A saw is bridged between the drive pulley and the joint interface,
After that, the floor slab cutting method is characterized in that the wire driving unit is driven to travel along the guide rail while the wire saw is driven to travel by the wire driving unit.

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