JP6758787B2 - Plate cutting device and plate cutting method - Google Patents

Description

The present invention relates to a floor slab cutting device using a wire saw and a floor slab cutting method performed using the floor slab cutting device.

In Patent Document 1, the applicant is a dismantling system for dismantling / removing a concrete slab laid on a bridge girder and forming a road surface of a bridge, and can move along the extending direction of the bridge. We proposed a mobile stage and a floor slab cutting device installed in the work space between the part of the concrete floor slab that is dismantled into blocks and the mobile stage.
The slab cutting device is an endless wire saw that is continuously extended in the direction along the joint boundary between the bridge girder and the concrete slab and in the width and thickness directions of the concrete slab, and the wire saw is extended. It has a plurality of pulleys for guiding the traveling direction along the installation route and driving the traveling.

JP-A-2018-87418

The floor slab cutting device of Patent Document 1 simultaneously cuts the direction along the joint interface between the bridge girder and the concrete floor slab (horizontal direction) and the width direction and thickness direction (vertical direction) of the concrete floor slab with a wire saw. Therefore, it was not possible to prohibit the horizontal cutting operation of the bridge girder and the concrete slab, if necessary, during the vertical cutting of the concrete slab.
That is, depending on the conditions and conditions of the site, for example, it is conceivable to cut the bridge girder and the concrete slab in the horizontal direction after cutting the concrete slab in the vertical direction, but this cannot be dealt with.

An object of the present invention is, if necessary, in a floor slab cutting device using a wire saw that is continuously extended in the direction along the joint interface between the bridge girder and the concrete slab and in the width direction and thickness direction of the concrete slab. Therefore, it is possible to prohibit the cutting operation in the direction along the joint interface between the bridge girder and the concrete slab.
Another object of the present invention is to make it possible to prohibit the cutting operation in the width direction and the thickness direction of the concrete slab, if necessary.

In order to solve the above problems, the invention according to claim 1 is
A wire saw that is laid on the bridge girder and extends continuously in the direction along the joint interface between the concrete slab and the bridge girder that constitutes the road surface of the bridge, and in the width and thickness directions of the concrete slab, and the wire saw. In a floor slab cutting device provided with a plurality of pulleys for guiding the concrete in the traveling direction along the extension route and driving the concrete.
The joint between the bridge girder and the concrete slab by driving the wire saw while guiding the wire saw in the traveling direction in the vicinity of the cutting start portion in the direction along the joint boundary surface between the bridge girder and the concrete slab. It is characterized by arranging a fixed pulley that prohibits cutting operation in the direction along the boundary surface.

The invention according to claim 2
The floor slab cutting device according to claim 1.
The fixed pulleys are arranged on both sides of the bridge girder.

The invention according to claim 3
A method for cutting a floor slab using the floor slab cutting device according to claim 1 or 2.
A fixed pulley for guiding the wire saw in the traveling direction is arranged in the vicinity of the cutting start portion in the direction along the joint boundary surface between the bridge girder and the concrete floor slab.
It is characterized in that a cutting operation in a direction along the joint boundary surface between the bridge girder and the concrete slab by driving the wire saw is prohibited.

The invention according to claim 4
The floor slab cutting method according to claim 3.
After cutting the concrete slab in the width direction and the thickness direction by driving the wire saw,
Remove the fixed pulley and
By driving the wire saw, the bridge girder and the concrete slab are cut in a direction along the joint boundary surface.

The invention according to claim 5
A wire saw that is laid on the bridge girder and extends continuously in the direction along the joint interface between the concrete slab and the bridge girder that constitutes the road surface of the bridge, and in the width and thickness directions of the concrete slab, and the wire saw. In a floor slab cutting device provided with a plurality of pulleys for guiding the concrete in the traveling direction along the extension route and driving the concrete.
Along the width direction and the thickness direction of the concrete slab by driving the wire saw while guiding the wire saw in the traveling direction in the vicinity of the cutting start portion in the width direction and the thickness direction of the concrete slab. It is characterized by arranging a fixed pulley that prohibits cutting operation in the direction.

The invention according to claim 6
The floor slab cutting device according to claim 5.
The fixed pulley is arranged at at least one end of a planned cutting surface in the width direction and the thickness direction of the concrete slab.

The invention according to claim 7
A method for cutting a floor slab using the floor slab cutting device according to claim 5 or 6.
A fixed pulley for guiding the wire saw in the traveling direction is arranged near the cutting start portion in the width direction and the thickness direction of the concrete slab.
It is characterized in that the cutting operation in the width direction and the thickness direction of the concrete floor slab by the drive of the wire saw is prohibited.

The invention according to claim 8 is
The floor slab cutting method according to claim 7.
After cutting the joint interface between the bridge girder and the concrete slab by driving the wire saw,
Remove the fixed pulley and
By driving the wire saw, the concrete slab is cut in the width direction and the thickness direction.

According to the present invention, in a floor slab cutting device using a wire saw that is continuously extended in the direction along the joint interface between the bridge girder and the concrete slab and in the width direction and the thickness direction of the concrete slab, if necessary. Therefore, the cutting operation in the direction along the joint interface between the bridge girder and the concrete slab can be prohibited.
Further, according to the present invention, it is possible to prohibit the cutting operation in the width direction and the thickness direction of the concrete slab, if necessary.

It is a perspective view which shows the structure of one Embodiment of the floor slab cutting apparatus to which this invention is applied. It is a side view which shows the outline of the dismantling system of a concrete floor slab. It is a top view which shows the outline of the dismantling system of a concrete floor slab. It is a top view which shows the telescopic scaffolding. It is an enlarged sectional view which shows the dismantling system of the part where dismantling / removal work is performed. It is an enlarged sectional view which shows the dismantling system of the part where dismantling / removal work is performed. It is a perspective view which shows the outline of the floor slab cutting apparatus and the concrete floor slab to be cut. It is a front view which shows the floor slab cutting device and the concrete floor slab to be cut. It is a top view which shows the floor slab cutting apparatus and the concrete floor slab to be cut. It is a partially enlarged view which shows the driven pulley arranged around the 1st bridge girder and the peripheral structure. It is a front view which shows the floor slab cutting apparatus and the cut concrete floor slab. It is a side view which shows the outline of the dismantling system of a concrete floor slab. It is a schematic perspective view which shows the floor slab cutting apparatus of Embodiment 2. It is a schematic perspective view which shows the floor slab cutting apparatus of the modification 1. It is a schematic perspective view which shows the floor slab cutting apparatus of the modification 2. It is a schematic perspective view which shows the floor slab cutting apparatus of the modification 3. It is a schematic perspective view which shows the floor slab cutting apparatus of the modification 4. It is a schematic plan view (a) and a schematic front view (b) which show the structure of a mobile factory. It is a vertical sectional front view of the mobile factory of FIG. It is a schematic plan view which shows the floor slab cutting apparatus of Embodiment 3. It is a vertical sectional front view of the floor slab cutting device of FIG. It is a schematic plan view which shows the floor slab cutting apparatus of the modification 5.

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. Absent.

First, in FIG. 2 showing an outline of a concrete slab dismantling system to which the slab cutting device of the present invention is applied, 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 slab 3 laid on the plurality of bridge girders 2 to form a road surface of the bridge 1.
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.

A concrete wall rail 4 is provided on the side edge of the concrete floor slab 3. The wall balustrade 4 is provided integrally with the concrete floor slab 3, and can be disassembled at the same time as the concrete floor slab 3.
Further, the concrete slab 3 is formed by placing concrete in a state including a plurality of gibber 2a (for example, a stud gibber with a head) provided so as to project from the upper surface of the bridge girder 2 at the time of construction of the bridge 1. .. Therefore, the concrete floor slab 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 floor slab 3 are joined in this way is referred to as a joint boundary surface C1.

The concrete slab 3 constitutes the road surface of the bridge 1, and many vehicles normally pass through it. 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 slab 3 in the planned repair work section is divided into a plurality of areas (planned dismantling points) and dismantled / removed. Work shall be carried out.
Further, in such a bridge repair work, there are cases where all the passage of the bridge 1 is stopped and the concrete slab 3 is dismantled and removed at once in the width direction of the bridge 1, and a part of the passage of the bridge 1 is passed. In some cases, only a part of the concrete floor slab 3 is dismantled / removed, and the dismantling system of the present invention can handle both cases.
In the present embodiment, a case where only a part of the passage of the bridge 1 is stopped and a part of the concrete slab 3 is dismantled / removed will be described. However, the passage of the bridge 1 is completely stopped and the bridge 1 The same work process is used when the concrete floor slab 3 is dismantled and removed all at once in the width direction.

The dismantling system in the present embodiment is for dismantling and removing the concrete floor slab 3 in the bridge repair work, and includes a mobile stage 10, a floor slab cutting device 20, a floor slab lifting means 30, and a collection. It includes a dust means 40, a power generation means 50, and a control means.
The concrete floor slab 3 is dismantled in a plurality of sizes and sequentially so as to be large enough to be loaded on the transport vehicle T by such a dismantling system (see FIG. 12). In addition, the portion dismantled by the dismantling system also includes the wall balustrade 4. The dismantled (or dismantled) part of the concrete floor slab 3 is hereinafter referred to as a block 3a.

As shown in FIGS. 2 and 3, the mobile stage 10 is equipped with the above-mentioned means for dismantling / removing the concrete floor slab 3, and the extension direction of the bridge 1 with these means mounted. The stage main body 11, the legs 12, the protective work 13, the lower protective hanging scaffold 16, the protective fence 17, and the dust collector storage portion 18 are provided.
In such a mobile stage 10, after cutting the concrete floor slab 3 and separating the block 3a from the remaining portion, in the working direction (arrow Y) shown in FIGS. 2, 3, 9, and 12. It will be moved and placed where the next dismantling / removal work will take place.

The stage main body 11 is formed in a rectangular frame shape that is long in the extending direction of the bridge 1 by a plurality of steel frames 11a arranged vertically and horizontally in a plan view. Then, the legs 12 support the bridge 1 above the road surface (for example, at a height of about 2.5 m).
A fence 11b and a ramp 11c for ascending and descending between the road surface of the bridge 1 and the stage main body 11 are provided on the peripheral edge of the stage main body 11.
Further, as shown in FIG. 3, the stage main body 11 has an opening 11d formed by a plurality of steel frames 11a arranged vertically and horizontally, and formed at a position located above the work space 10S described later. The stage body 11 has a floor portion that is made of a wire mesh such as expanded metal and is provided at a position other than the opening 11d.
Further, of the plurality of steel frames 11a, the two steel frames 11a and 11a located above the work space 10S, which will be described later, are provided so as to project outside the bridge 1 (outside the wall column 4).

As shown in FIGS. 2 and 3, the legs 12 are provided on the lower surfaces of four steel frames 11a constituting the stage main body 11 so that the stage main body 11 and each of the means can be supported in a well-balanced manner. ..
Wheels 12a are provided at the lower ends of the legs 12, and the stage body 11 can be moved along the extending direction of the bridge 1.

As shown in FIGS. 2 to 6, the protective work 13 is connected to the stage main body 11 and is located outside the bridge 1, and extends from the side to the bottom of the concrete floor slab 3 cut by the plate cutting device 20. Have been placed. Since the protective work 13 is arranged from the side to the bottom of the concrete floor slab 3, it functions as a scaffolding during work and as a safety facility for the side and the bottom.
Such a protection work 13 includes an upper protection work 14 and a lower protection work 15, and these upper protection work 14 and the lower protection work 15 are connected via a rotating member 13a.

The upper protective work 14 is a skeleton structure formed of a plurality of metal materials, and among the steel frames 11a constituting the stage main body 11, is integrally with the steel frames 11a and 11a protruding to the outside of the bridge 1 described above. It is connected.
A rotating member 13a is provided at the center of the lower end of the upper protective work 14.

The lower protection work 15 is a skeleton structure formed of a plurality of metal materials, and is located below the concrete slab 3.
Further, as shown in FIGS. 4 to 6, the lower protection work 15 is provided with a telescopic scaffold 15a provided at the lower end portion of the lower guardian and expands and contracts in the horizontal direction. The lower protective work 15 is formed in a substantially L shape in a side view by providing the telescopic scaffolding 15a. The telescopic scaffold 15a has a floor portion made of a wire mesh such as an expanded metal.
A rotating member 13a is provided at the center of the upper end of the lower protective work 15. The lower protective work 15 can be rotated in the horizontal direction by the rotating member 13a.

The lower protective suspension scaffold 16 is arranged from the side to the lower side of the concrete floor slab 3 to be dismantled and removed, and is inside the protective work 13 by a suspension member such as a chain hooked on the bridge girder 2. It is provided so as to be located.
Since the lower protective suspension scaffold 16 is arranged from the side to the bottom of the concrete floor slab 3, it functions as a scaffold during work and as a safety facility for the side and the bottom.

The work space 10S refers to the space between the block-shaped disassembled portion (block 3a) of the concrete floor slab 3 and the mobile stage 10, and is below the opening 11d formed in the stage body 11. To position.
A protective fence 17 is provided around the work space 10S to prevent intrusion into the work space 10S and to suppress the scattering of dust generated in the cutting work of the floor slab cutting device 20. It is assumed that the guard fence 17 is provided on the four circumferences of the work space 10S.

The dust collector storage unit 18 is provided on the lower surface of the stage main body 11, and can store a plurality of dust collectors 40, which will be described later. Further, the dust collector storage portion 18 is arranged at a position surrounded by the four legs 12 and adjacent to the work space 10S.

As shown in FIGS. 6 to 10, the floor slab cutting device 20 is installed in the work space 10S between the portion (block 3a) of the concrete floor slab 3 to be disassembled into a block shape and the mobile stage 10. , For cutting the concrete floor slab 3 into blocks.
The floor slab cutting device 20 in the present embodiment is driven by a first wire saw cutting device 21, a second wire saw cutting device 22, and these first wire saw cutting device 21 and a second wire saw cutting device 22. The endless wire saw 23, various pulleys 210, 211,212 built in the first wire saw cutting device 21, various pulleys 220, 221 built in the second wire saw cutting device 22, depending on the cutting location. A plurality of driven pulleys 24 and guide rollers 25 are provided.
The first wire saw cutting device 21 is installed above the bridge girder 2 (hereinafter, the first bridge girder 2A) located on the outermost side of the bridge 1, and the second wire saw cutting device 22 is located on the outermost side. It is installed above the bridge girder 2 (hereinafter referred to as the second bridge girder 2B) located one inside the bridge girder 2A.

The wire saw 23 is continuously extended in the direction along the joint boundary surface C1 between the bridge girder 2 (first bridge girder 2A, second bridge girder 2B) and the concrete slab 3 and in the width direction and thickness direction of the concrete slab 3. ing.
The plurality of pulleys 210, 211,212, 220, 221 and the plurality of driven pulleys 24 built in the first wire saw cutting device 21 and the second wire saw cutting device 22 extend the wire saw 23 along its extension path. It is for guiding the vehicle in the traveling direction and driving the vehicle.

The first wire saw cutting device 21 includes a drive pulley 210, a fixed pulley 211, and a moving pulley 212 as a plurality of built-in pulleys.
Further, it is assumed that the plurality of pulleys 210, 211, and 212 are housed in the housing 21a. That is, the plurality of pulleys 210, 211, and 122 are in a state of being covered by the housing 21a.
Further, the first wire saw cutting device 21 is installed on a support base 21b installed on the road surface.
The first wire saw cutting device 21 is necessary for dismantling / removing the concrete floor slab 3, including a cooling device for cooling the wire saw 23, in addition to the plurality of built-in pulleys 210, 211,212. It shall have various devices and functions.

The drive pulley 210 is attached to the drive devices 210a and 210b and is configured to rotate. The drive pulley 210 (hereinafter referred to as the first drive pulley 210A) located on the wall balustrade 4 side and the bridge 1 are located on the center side of the bridge 1. It is composed of a positioned drive pulley 210 (hereinafter, second drive pulley 210B).
The wire saw 23 is fed out along with the rotational drive of the first drive pulley 210A and the second drive pulley 210B, and travels at high speed.

The fixed pulley 211 is the first fixed pulley 211A, the second fixed pulley 211B, and the third fixed pulley 211C, which are fixed at a position between the first drive pulley 210A and the second drive pulley 210B and are rotatable. And consists of.
A wire saw 23 is wound around the fixed pulleys 211A, 211B, and 211C alternately with the moving pulley 212, and functions effectively when tension is applied to the wire saw 23 that relaxes as the cutting work progresses. To do.

The moving pulley 212 is a first moving pulley 212A that is movable upward (up and down) and is rotatable from a position between the first driving pulley 210A and the second driving pulley 210B, and a second moving pulley. It consists of 212B.
A wire saw 23 is wound around the moving pulleys 212A and 212B alternately with the fixed pulley 211, and tension can be applied to the wire saw 23 by moving so as to widen the distance from the fixed pulley 211. ..

The second wire saw cutting device 22 includes a drive pulley 220 and a fixed pulley 221 as a plurality of built-in pulleys.
In addition to the plurality of built-in pulleys as described above, the second wire saw cutting device 22 includes a cooling device for cooling the wire saw 23 and various types required for dismantling / removing the concrete floor slab 3. It shall have the equipment and functions of.
Further, it is assumed that the plurality of pulleys are housed in the housing 22a. That is, the plurality of pulleys are in a state of being covered by the housing 22a.

The drive pulley 220 is attached to the drive device 220a and is configured to rotate. Further, the drive pulley 220 is movable in the vertical direction. That is, the drive pulley 220 can not only run the wire saw 23 at high speed but also apply tension to the wire saw 23 by moving it in the vertical direction. Further, the rotation speed of the drive pulley 220 is equivalent to the rotation speed of the first drive pulley 210A and the second drive pulley 210B in the first wire saw cutting device 21.

The fixed pulley 221 is fixed at a position close to the drive pulley 220 and is rotatable.
The wire saw 23 is wound around the fixed pulley 221 alternately with the moving pulley 212, and functions effectively when tension is applied to the wire saw 23 that relaxes as the cutting operation progresses.

As shown in FIGS. 7 to 10, the plurality of driven pulleys 24 have a second wire saw cutting device 22 from a first driven pulley 240 provided following the first drive pulley 210A in the first wire saw cutting device 21. A tenth driven pulley 249 provided in front of the second drive pulley 210B in the first wire saw cutting device 21 is provided via the passage.

The first driven pulley 240 is attached to the lower end of the first wire saw cutting device 21 via an attachment member 240a, and is located below the first drive pulley 210A in the first wire saw cutting device 21. There is.
The wire saw 23 unwound from the first wire saw cutting device 21 is extended so as to continue to the upper end portion of the wall balustrade 4 via the first driven pulley 240.

The second driven pulley 241 is arranged at a position where it wraps around below the concrete floor slab 3 from the wall railing column 4. The second driven pulley 241 is attached to the first bridge girder 2A via the attachment member 241a.
The wire saw 23 is extended so as to be wound from the upper side of the second driven pulley 241 and extended downward.
By applying tension to the wire saw 23 wound around the first driven pulley 240 and the second driven pulley 241 to cut the portion of the concrete slab 3 located outside the first bridge girder 2A. be able to.

The third driven pulley 242 is arranged below the second driven pulley 241 and closer to the first bridge girder 2A. The third driven pulley 242 is attached to the first bridge girder 2A via the attachment member 242a. Further, the mounting member 242a is integrally configured with the mounting member 241a in the second driven pulley 241.
The wire saw 23 is extended so as to be wound around the lower side of the third driven pulley 242 and extended upward.

The fourth driven pulley 243 is arranged above the third driven pulley 242 and adjacent to the second driven pulley 241. Further, the fourth driven pulley 243 is arranged so as to intersect with the second driven pulley 241. Further, the fourth driven pulley 243 is attached to the first bridge girder 2A via the attachment member 243a. Further, the mounting member 243a is integrally formed with the mounting member 241a of the second driven pulley 241 and the mounting member 242a of the third driven pulley 242.
The wire saw 23 is wound around the upper side of the fourth driven pulley 242 and is extended so as to be horizontally extended in the length direction of the first bridge girder 2A. The wire saw 23 unwound from the fourth driven pulley 243 is extended so as to be wound around the edge of the joint boundary surface C1 between the first bridge girder 2A located on the outermost side of the bridge 1 and the concrete slab 3. There is.

The fifth driven pulley 244 is provided inside the first bridge girder 2A located on the outermost side (center side of the bridge 1) and inside the planned cutting surface C2 in the thickness direction of the block 3a.
The wire saw 23 wound around the edge of the joint boundary surface C1 between the first bridge girder 2A and the concrete floor slab 3 is wound around the fifth driven pulley 244. That is, by applying tension to the wire saw 23 wound around the fourth driven pulley 243 and the fifth driven pulley 244, the cutting work at the joint boundary surface C1 between the first bridge girder 2A and the concrete floor slab 3 is performed. It can be carried out. At this time, a plurality of gibber 2a provided on the upper surface of the first bridge girder 2A can also be cut at the same time.
The wire saw 23 wound around the fifth driven pulley 244 is extended so as to be extended toward the second bridge girder 2B.

The sixth driven pulley 245 is provided at an intermediate point between the first bridge girder 2A and the second bridge girder 2B, and at an intermediate point between the fifth driven pulley 244 and the seventh driven pulley 246, which will be described later.
The wire saw 23 is extended so as to be in contact with the upper side of the sixth driven pulley 245. That is, the sixth driven pulley 245 is located at an intermediate point between the fifth driven pulley 244 and the seventh driven pulley 246, which will be described later, and is provided to suppress the bending of the wire saw 23.

The seventh driven pulley 246 is provided at a position parallel to the fifth driven pulley 244 and on the first bridge girder 2A side of the second bridge girder 2B. That is, the 7th driven pulley 246 is positioned opposite to the 5th driven pulley 244.
The wire saw 23 unwound from the 5th driven pulley 244 is wound around the 7th driven pulley 246 via the 6th driven pulley 245, and the wire saw 23 unwound from the 7th driven pulley 246 is , The second bridge girder 2B and the concrete slab 3 are extended so as to be wound around the edge of the joint boundary surface C1.

The eighth driven pulley 247 is provided inside the second bridge girder 2B (on the center side of the bridge 1) and at a position aligned with the planned cutting surface C2 in the thickness direction of the block 3a.
The wire saw 23 wound around the edge of the joint boundary surface C1 between the second bridge girder 2B and the concrete floor slab 3 is wound around the eighth driven pulley 247. That is, by applying tension to the wire saw 23 wound around the 7th driven pulley 246 and the 8th driven pulley 247, the cutting work at the joint boundary surface C1 between the second bridge girder 2B and the concrete floor slab 3 is performed. It can be carried out. At this time, a plurality of gibber 2a provided on the upper surface of the second bridge girder 2B can also be cut at the same time.
The wire saw 23 wound around the eighth driven pulley 247 is extended so as to be extended toward the second bridge girder 2B.

The ninth driven pulley 248 is attached to the lower end of the second wire saw cutting device 22 via the attachment member 248a, and the core line cut portion 3c on the second bridge girder 2B side formed on the concrete floor slab 3. It is provided inside (described later). Further, the ninth driven pulley 248 is arranged at a position and orientation in which the wire saw 23 can be fed out along the planned cutting surface C2 in the thickness direction of the block 3a.
The wire saw 23 is wound around the lower side of the ninth driven pulley 248 and is extended so as to be extended upward. The wire saw 23 drawn upward is wound around a drive pulley 220 built in the second wire saw cutting device 22.

The wire saw 23 unwound from the ninth driven pulley 248 is wound around the drive pulley 220 of the second wire saw cutting device 22 located above the ninth driven pulley 248.
The wire saw 23 unwound from the drive pulley 220 is wound around the fixed pulley 221 of the second wire saw cutting device 22.
The wire saw 23 unwound from the fixed pulley 221 protrudes from the lower end of the second wire saw cutting device 22 and covers the lower surface of the portion of the concrete slab 3 located between the first bridge girder 2A and the second bridge girder 2B. After passing through, it passes upward through the core line cut portion 3b (described later) on the first bridge girder 2A side formed on the concrete slab 3, and is wound around the tenth driven pulley 249.

The tenth driven pulley 249 is attached to the lower end of the first wire saw cutting device 21 via an attachment member 249a, and is located below the second drive pulley 210B in the first wire saw cutting device 21. There is.
The wire saw 23 unwound from the tenth driven pulley 249 is wound around the second drive pulley 210B in the first wire saw cutting device 21.

The wire saw 23 unwound from the second drive pulley 210B is alternately wound around the fixed pulleys 211 (211A, 211B, 211C) and the moving pulleys 212 (212A, 212B) in the first wire saw cutting device 21. It is hung and reaches the first drive pulley 210A.
Since the wire saw 23 has an endless shape, the concrete slab 3 can be cut by traveling along the extension path as described above.
Since the wire saw 23 relaxes as the cutting work progresses, the moving pulleys 212 (212A and 212B) in the first wire saw cutting device 21 and the drive pulley 220 in the second wire saw cutting device 22 are operated to move appropriately. , Tension will be applied to the wire saw 23.

As shown in FIGS. 9 and 10, the guide roller 25 has a rotation axis along both side edges at the upper ends of both the first bridge girder 2A and the second bridge girder 2B, and the first bridge girder 2A and the second bridge girder 2A. 2B is arranged so as to be in contact with the lower surface of the wire saw 23 protruding outward from both side edges at the upper ends of both sides. Such a guide roller 25 is configured to be rotatable around an axis according to the traveling of the wire saw 23.
That is, the guide roller 25 includes a wire saw 23 wound around the fourth driven pulley 243 and the fifth driven pulley 244 in order to cut the joint boundary surface C1 between the first bridge girder 2A and the concrete floor slab 3. The wire saw while suppressing the bending of the wire saw 23 wound around the 7th driven pulley 246 and the 8th driven pulley 247 in order to cut the joint boundary surface C1 between the second bridge girder 2B and the concrete floor slab 3. It is for guiding the running of 23.
The 4th driven pulley 243 and the 5th driven pulley 244 are horizontally separated from the upper end of the 1st bridge girder 2A, and the 7th driven pulley 246 and the 8th driven pulley 247 are horizontally separated from the upper end of the 2nd bridge girder 2B. Are separated from each other. Therefore, the wire saw 23 wound around each of the pulleys 243, 244, 246, and 247 is opened in a "H" shape toward the pulleys 243, 244, 246, and 247. Further, as the cutting work proceeds, the wire saw 23 gradually approaches each pulley 243, 244, 246, 247, so that the portion of the wire saw 23 where bending should be suppressed also gradually changes as the cutting work progresses. .. The guide roller 25 is formed to be long to correspond to this, and even if the bending position of the wire saw 23 gradually changes as the cutting work progresses, the bending of the wire saw 23 is more reliably suppressed. While doing so, it is possible to guide the traveling of the wire saw 23.
The guide rollers 25 include a first guide roller 25A and a second guide roller 25B along both side edges at the upper end of the first bridge girder 2A, and a third guide roller 25C and a third guide roller 25C along both side edges at the upper end of the second bridge girder 2B. It consists of a fourth guide roller 25D.
Further, these guide rollers 25A, 25B, 25C, and 25D are fixed to the first bridge girder 2A and the second bridge girder 2B via the support member 26.

Since the concrete slab 3 is laid on the first bridge girder 2A and the second bridge girder 2B, the concrete slab 3 from which the block 3a is separated by the slab cutting device 20 is the first bridge girder 2A and the first bridge girder 2A. There will be places that are not on either of the two bridge girders 2B.
As shown in FIG. 8, the second bridge girder 2B is provided with a reinforcing vertical girder 27 via a diagonal member 27a in order to ensure that the concrete floor slab 3 can be supported even if such a portion occurs. ing. The reinforcing vertical girder 27 shall be provided in advance along the place where the concrete floor slab 3 is to be dismantled / removed. Further, the installation work of the reinforcing vertical girder 27 may be performed by using the protective work 13 or the lower protective suspended scaffold 16 as a work scaffold after the protective work 13 or the lower protective suspended scaffold 16 is installed.

The floor slab lifting means 30 is for lifting the block 3a of the concrete floor slab 3 mounted on the mobile stage 10 and separated from other parts by the floor slab cutting device 20. In this embodiment, a jib crane is adopted, and the jib crane is fixed to the steel frame 11a so as to be located on the plurality of steel frames 11a constituting the stage main body 11.
The hook of the jib crane, which is the floor slab lifting means 30, can be inserted into the work space 10S through the opening 11d of the stage body 11.
The floor slab lifting means 30 in the present embodiment employs a jib crane, but the present invention is not limited to this. That is, any crane can be used as long as it can be fixed to the stage body 11, the block 3a can be lifted, and the block 3a can be lifted and swiveled.

The dust collecting means 40 is for sucking dust generated when the concrete floor slab 3 is cut by the floor slab cutting device 20, and is composed of a plurality of dust collectors 40.
The plurality of dust collectors 40 are housed in the dust collector storage unit 18 provided on the lower surface of the stage main body 11 as described above. Further, the plurality of dust collectors 40 are provided with hoses (not shown), and the hoses are arranged particularly toward places where dust is generated, such as in the work space 10S and the lower protective suspension scaffold 16.

The power generation means 50 is a power supply device arranged on the upper surface of the stage main body 11 adjacent to the floor slab lifting means 30. The power supply device 50 includes a power transmission cable (not shown) and is wired toward a device that requires electric power.

Although not shown, the control means is for controlling various means such as the floor slab cutting device 20 and the floor slab lifting means 30 constituting the above dismantling system, and communicates with various means. be able to. As a result, various means constituting the dismantling system can be remotely controlled, and safety during work can be improved.
In addition, cameras are installed around the mobile stage 10 and the work site so that workers can remotely monitor them.

Next, a method of dismantling the concrete slab 3 constituting the road surface of the bridge 1 will be described by the dismantling system having the above configuration.

In carrying out the repair work of the bridge 1, first, as shown in FIGS. 2 and 3, the lane regulation on the bridge 1 is performed by using the road cone 5 and the regulation bar 6.
However, in the repair work of the bridge 1 in the present embodiment, only a part of the bridge 1 is stopped and a part of the concrete slab 3 is dismantled / removed, and the bridge 1 is extended in the width direction. When the concrete floor slab 3 is dismantled and removed at once, the bridge 1 is closed.

Subsequently, the mobile stage 10 is arranged so as to form a work space 10S between the concrete floor slab 3 and a portion (block 3a) of the concrete floor slab 3 to be separated from other portions by the plate cutting device 20.
More specifically, the mobile stage 10 is assembled at the repair work site surrounded by the road cone 5 and the regulation bar 6, and the jib crane 30, the plurality of dust collectors 40, and the power supply device 50 are mounted on the mobile stage. It is mounted on 10.
When assembling the mobile stage 10, the protective work 13 is also assembled and connected to the stage main body 11. Further, the lower protective suspension scaffold 16 is also installed on the first bridge girder 2A and the second bridge girder 2B.

Subsequently, the reinforcing vertical girder 27 is installed on the second bridge girder 2B by using the lower protective work 15 or the lower protective suspension scaffold 16 in the protective work 13. The reinforcing vertical girder 27 shall be installed on the lower protective work 15 or the lower protective suspended scaffold 16 using, for example, a wire rope or a pulley.
When the reinforcing vertical girder 27 is installed or the concrete floor slab 3 is being cut, the telescopic scaffolding 15a of the lower protective work 15 is in an extended state as shown in FIGS. 4 and 5.

Subsequently, in the concrete floor slab 3, a diamond bit (cylindrical shape) (cylindrical shape) (cylindrical shape) is not shown at a portion included in the peripheral edge of the block 3a separated from other parts and located above the first bridge girder 2A and the second bridge girder 2B. (Refer to Fig. 9 etc.).
As a result, core line cut portions 3b and 3c are formed at two locations on the first bridge girder 2A of the concrete floor slab 3, and core line cut portions 3d and 3e are formed at two locations located on the second bridge girder 2B. Is formed.
Further, only when the concrete floor slab 3 is first cut to separate the block 3a from other parts, the core line cut portion 3c on the first bridge girder 2A and the core line cut portion 3e on the second bridge girder 2B The space and the space between the core line cut portion 3c and the outer end of the concrete floor slab 3 (including the wall column 4) are cut by a cutting machine (not shown). As a result, the inter-core cut portion 3f is formed.
Further, the boundary portion between the location where the repair work is to be performed (the location to be removed) and the location on the center side of the bridge 1 (the remaining location) is cut in the extending direction of the bridge 1 (repair work is performed) by a cutting machine (not shown). Cut along the extending direction of the portion: the direction of the arrow Y). As a result, the boundary cut portion 3g is formed.
The core line cut portions 3b to 3e and the inter-core cut portion 3f are formed so as to penetrate the concrete floor slab 3 in the thickness direction.
Further, the end on the center side of the bridge 1 in the core line cut portions 3d and 3e located on the second bridge girder 2B corresponds to the end on the center side of the bridge 1 in the block 3a to be removed. Similarly, the boundary cut portion 3g corresponds to the central side side of the bridge 1 in the block 3a to be removed.

Subsequently, guide rollers 25 (25A, 25B, 25C, 25D) are arranged along both side edges at the upper ends of both the first bridge girder 2A and the second bridge girder 2B. At this time, the rotation axes of the guide rollers 25 (25A, 25B, 25C, 25D) are also in a state along both side edges at the upper ends of both the first bridge girder 2A and the second bridge girder 2B.

Subsequently, as shown in FIG. 6 and the like, the first wire saw cutting device 21 and the second wire saw cutting device 22 are installed and fixed in the work space 10S. The first wire saw cutting device 21 is installed on the concrete slab 3 via the support base 21b.
Further, the wire saw 23 is continuously extended in the direction along the joint boundary surface C1 between the first bridge girder 2A and the second bridge girder 2B and the concrete slab 3 and in the width direction and the thickness direction of the concrete slab 3.
That is, the driven pulleys 240 to 249 are arranged at predetermined positions and directions. Then, the endless wire saw 23 is driven by the pulleys 210 and 211 and 212 built in the first wire saw cutting device 21 and the pulleys 220 and 221 built in the second wire saw cutting device 22. Wrap around pulleys 240 to 249.
At this time, the wire saw 23 is also hooked on the upper end portion of the wall balustrade 4, and is also passed through the core line cut portions 3b to 3e.
Further, the wire saw 23 is in contact with each of the guide rollers 25 (25A, 25B, 25C, 25D) arranged along both side edges at the upper ends of both the first bridge girder 2A and the second bridge girder 2B.

Subsequently, a protective fence 17 is installed on the outer circumference of the work space 10S.
Further, hoses (not shown) extending from the plurality of dust collectors 40 are arranged toward places where dust is particularly generated, such as in the work space 10S and the lower protective suspension scaffold 16, and other necessary places.
In addition, a seat cover that suppresses the scattering of dust is appropriately provided at a place where the scattering of dust is expected in the cutting range.

Subsequently, the drive pulleys 210A, 210B, and 220 of the first wire saw cutting device 21 and the second wire saw cutting device 22 are rotated to drive the wire saw 23 traveling along the extending direction thereof. As a result, the cutting work of the concrete floor slab 3 is started.
Since the wire saw 23 relaxes as the cutting work progresses, as shown in FIG. 7, the moving pulleys 212A and 212B built in the first wire saw cutting device 21 and the drive pulley 220 in the second wire saw cutting device 22 The cutting work is performed while moving the concrete floor slab 3 upward to maintain a tension sufficient to cut the concrete floor slab 3.
While the wire saw 23 is running, the wire saw 23 is cooled by a cooling device (not shown) built in the first wire saw cutting device 21 and the second wire saw cutting device 22, and the wire saw 23 generates heat. Suppress.

By driving the wire saw 23 in this way, the concrete floor slab 3 can be cut and disassembled into blocks. That is, as shown in FIG. 11, the block 3a can be separated from other parts of the concrete slab 3.
While the concrete floor slab 3 is being cut by the floor slab cutting device 20, a portion (block 3a) to be separated from other portions is suspended and supported by the jib crane 30.
After the block 3a is separated, the first wire saw cutting device 21, the second wire saw cutting device 22, the wire saw 23, and the driven pulleys 240 to 249 are removed. The removed devices, etc. will be transported to the next planned dismantling location. At this time, each device or the like may be carried on an empty space on the mobile stage 10 by using a jib crane 30 or the like.

The block 3a separated from other parts is lifted by the jib crane 30 and placed on the transport vehicle T as shown in FIG.
When the block 3a is large enough to pass through the opening 11d of the stage main body 11, the block 3a is lifted upward by passing through the opening 11d by the jib crane 30.
On the other hand, if the block 3a has a size that does not allow it to pass through the opening 11d, the mobile stage 10 is temporarily moved in the working direction while being lifted to a height that allows it to stay in the work space 10S, and then moved to the next planned dismantling location. Temporarily place block 3a. Subsequently, the mobile stage 10 is further moved in the working direction to bring the block 3a out of the range of the working space 10S, and then lifted by the jib crane 30 and placed on the transport vehicle T. Then, the block 3a is carried out by the transport vehicle T.

After the block 3a is placed on the transport vehicle T, the portion of the first bridge girder 2A and the second bridge girder 2B from which the block 3a has been removed is cleaned and the adhering concrete is removed.
It should be noted that this work may be carried out collectively after the concrete floor slab 3 has been dismantled and removed in all the planned repair work sections.

After that, the mobile stage 10 is moved so that the work space 10S is located on the next planned dismantling location, the above-mentioned work process is repeated, and the dismantling / removal of all the concrete slabs 3 in the planned repair work section is performed. Do the work.
If there is a pier in the planned repair work section, the lower protection work 15 in the protection work 13 is rotated 90 degrees or 180 degrees via the rotating member 13a to prevent the lower protection work 15 and the pier from coming into contact with each other. .. At this time, it is desirable to reduce the load applied to the stage body 11 by keeping the telescopic scaffold 15a in a contracted state.

Although not shown, new slabs such as steel slabs and precast concrete slabs manufactured in advance at the factory will be installed after the dismantling / removal work of all concrete slabs 3 in the planned repair work section. ..
Bridge repair work is carried out as described above.

According to the present embodiment, the floor slab cutting device is installed in the work space between the concrete floor slab and the mobile stage, and the floor slab lifting means is mounted on the mobile stage, so that each means can be moved. It can be gathered together in and around the stage. Therefore, each means is unlikely to interfere with each other's work, and it is possible to prevent each means from interfering with the movement of the moving stage. Further, since the floor slab cutting device 20 has a wire saw 23 extending continuously in the direction along the joint boundary surface C1 between the bridge girder 2 and the concrete floor slab 3 and in the width direction and the thickness direction of the concrete floor slab 3. , The concrete floor slab 3 can be disassembled into blocks. As a result, the concrete floor slab 3 can be efficiently disassembled and removed.

Further, the floor slab cutting device 20 has a wire saw 23 whose rotation axis is along both side edges at the upper end of the bridge girder 2 (2A, 2B) and protrudes outside from both side edges at the upper end of the bridge girder 2. It has guide rollers 25 (25A, 25B, 25C, 25D) arranged so as to be in contact with the lower surface, and the guide rollers 25 are rotatably configured around the axis according to the traveling of the wire saw 23. It is possible to guide the running of the wire saw 23 while surely suppressing the bending of the wire saw 23 that relaxes as the cutting work progresses. As a result, the levelness of the wire saw 23 can be ensured, so that the cutting work of the joint boundary surface C1 between the bridge girder 2 and the concrete slab 3 can be performed accurately.

Further, since the dismantling system is mounted on the mobile stage 10 and includes a plurality of dust collectors 40 for sucking dust generated when the concrete floor slab 3 is cut by the floor slab cutting device 20, for example, the work space 10S and the lower protection It is possible to reliably suck the dust generated in a place where dust is particularly generated, such as in the suspension scaffold 16, or in other necessary places. As a result, it is possible to suppress the scattering of dust to the surroundings, so that dismantling / removal work can be performed in consideration of the surrounding environment.

Further, the mobile stage 10 has a protective work 13 which is connected to the stage main body 11 and is located outside the pier and is arranged from the side to the lower side of the concrete floor slab 3 cut by the floor slab cutting device 20. Therefore, the protective work 13 functions as a scaffolding during work and further as safety equipment for the side and the lower side, and can improve the safety during work.
Further, the lower protective work 15 which is a part of the protective work 13 located below the concrete slab 3 is configured to be able to rotate in the horizontal direction with respect to the upper protective work 14, so that it can be used in the planned repair work section. When there is a pier, contact with the pier can be prevented by rotating the lower protection work 15. Therefore, even if there is a pier in the section scheduled for repair work, the mobile stage 10 can be moved, so that the concrete floor slab 3 can be dismantled and removed without delay.

In the floor slab cutting device 20 in the above floor slab dismantling system, in the present invention, as shown in FIG. 1, a wire saw is provided in the vicinity of the cutting start portion in the direction along the joint boundary surface C1 between the bridge girder 2 and the concrete floor slab 3. A fixed pulley 61 that prohibits a horizontal cutting operation along the joint boundary surface C1 between the bridge girder 2 and the concrete slab 3 driven by the wire saw 23 is arranged while guiding the 23 in the traveling direction.

That is, in the illustrated example, in the first wire saw cutting device 21 and the second wire saw cutting device 22, near the position in front of the cutting start portion in the horizontal direction along the joint boundary surface C1 between the bridge girders 2A and 2B and the concrete floor slab 3. , Rotating fixed pulleys 61, which prohibit the horizontal cutting operation along each joint boundary surface C1, are fixed to both sides of the bridge girders 2A and 2B with mounting members (not shown) and arranged.
Regarding the first wire saw cutting device 21, a pair of left and right wire saws 23 wound around the fourth driven pulley 243 and the fifth driven pulley 244 are arranged on both sides near the cutting start portion of the bridge girder 2A. Wrap around the fixed pulley 61 of.
Regarding the second wire saw cutting device 22, a pair of left and right wire saws 23 wound around the seventh driven pulley 246 and the eighth driven pulley 247 are arranged on both sides in the vicinity of the cutting start portion of the bridge girder 2B. Wrap around the fixed pulley 61 of.

By arranging the fixed pulley 61 in this way, by driving the wire saw 23, both the first wire saw cutting device 21 and the second wire saw cutting device 22 are in the width direction and the thickness direction of the concrete floor slab 3, that is, Only the vertical direction is cut, and the horizontal cutting along the joint boundary surface C1 between the bridge girders 2A and 2B and the concrete slab 3 is not started, and each is held in the prohibited state.

After that, the drive of the wire saw 23 is stopped, and the fixed pulley 61 is removed from the mounting members on both sides of the bridge girders 2A and 2B, respectively.
As a result, as shown in FIG. 7, both the first wire saw cutting device 21 and the second wire saw cutting device 22 cut in the horizontal direction along the joint boundary surface C1 between the bridge girders 2A and 2B and the concrete slab 3. It will be possible.

Therefore, by driving the wire saw 23 again, both the first wire saw cutting device 21 and the second wire saw cutting device 22 cut the bridge girders 2A and 2B in the horizontal direction along the joint boundary surface C1 of the concrete floor slab 3.

As described above, according to the floor slab cutting device 20 of the embodiment, in the first wire saw cutting device 21 and the second wire saw cutting device 22, in the horizontal direction along the joint boundary surface C1 between the bridge girders 2A and 2B and the concrete floor slab 3. In the vicinity of the cutting start portion, fixed pulleys 61 for prohibiting each horizontal cutting operation are arranged on both sides of the bridge girders 2A and 2B, respectively.
Therefore, by driving the wire saw 23, both the first wire saw cutting device 21 and the second wire saw cutting device 22 can cut only the vertical direction of the concrete floor slab 3, respectively, and the bridge girders 2A and 2B and the concrete floor can be cut. The horizontal cutting operation of the plate 3 is not started, and each can be held in the prohibited state.

In this way, at the work site for dismantling the floor slab, the horizontal cutting operation of the bridge girders 2A and 2B and the concrete floor slab 3 can be prohibited as necessary depending on the conditions and conditions of the site.

Then, the drive of the wire saw 23 is stopped, and the fixed pulley 61 is removed from the mounting members on both sides of the bridge girders 2A and 2B. By driving the wire saw 23 again, the first wire saw cutting device 21 and the first wire saw are cut. Both the wire saw cutting device 22 can cut the bridge girders 2A and 2B and the concrete slab 3 in the horizontal direction, respectively.

(Embodiment 2)
FIG. 13 shows the floor slab cutting device 20 of the second embodiment, in which the wire saw 23 is guided in the traveling direction in the vicinity of the cutting start portion in the width direction and the thickness direction of the concrete floor slab 3. Fixed pulleys 62, 63, and 64 that prohibit the vertical cutting operation along the planned cutting surface C2 of the concrete floor slab 3 driven by the saw 23 are arranged and configured.

That is, as shown in the drawing, the first wire saw cutting device 21 is cut in the vertical direction along the planned cutting surface C2 near the position in front of the cutting start portion in the vertical direction along the planned cutting surface C2 of the concrete floor slab 3. A rotatable fixing pulley 62, which prohibits operation, is fixed to the outer portion of the concrete floor slab 3 and the wall balustrade 4 with a mounting member (not shown) and arranged vertically.
In this way, the wires wound around the first driven pulley 240 and the second driven pulley 241 around the pair of upper and lower fixed pulleys 62 arranged in the outer portion near the front position of the cutting start portion of the concrete floor slab 3 and the wall plate 4. Wrap each saw 23.

Further, also for the second wire saw cutting device 22, the vertical cutting operation along the planned cutting surface C2 is prohibited in the vicinity of the position in front of the cutting start portion in the vertical direction along the planned cutting surface C2 of the concrete floor slab 3. , The rotatable fixing pulley 63 is fixed to the inner portion of the bridge girder 2A with a mounting member (not shown) and arranged vertically.
Further, the rotatable fixing pulley 64 is also fixed to the inner portion of the bridge girder 2B with a mounting member (not shown) and arranged vertically.
In this way, the wire saws 23 wound around the fixed pulley 221 and the eighth driven pulley 247 are attached to the three fixed pulleys 63 and 64 arranged on both sides near the cutting start portion of the concrete floor slab 3. Wrap it around.

By arranging the fixed pulleys 62, 63, and 64 in this way, the bridge girders 2A and 2B and the concrete floor slab 3 are used for both the first wire saw cutting device 21 and the second wire saw cutting device 22 by driving the wire saw 23. Only the direction along the joint boundary surface C1, that is, the horizontal direction is cut, and the vertical cutting along the width direction and the thickness direction of the concrete slab 3 is not started and is held in the prohibited state.

After that, the drive of the wire saw 23 is stopped, the fixed pulley 62 is removed from the mounting members on the outer side of the concrete floor slab 3 and the wall railing 4, respectively, and the fixed pulleys 63 and 64 are placed inside both the bridge girders 2A and 2B. Remove each from the mounting member of the part.
As a result, as shown in FIG. 7, both the first wire saw cutting device 21 and the second wire saw cutting device 22 can cut the concrete floor slab 3 in the vertical direction along the planned cutting surface C2.

Therefore, by driving the wire saw 23 again, both the first wire saw cutting device 21 and the second wire saw cutting device 22 cut in the vertical direction along the planned cutting surface C2 of the concrete floor slab 3.

As described above, according to the floor slab cutting device 20 of the second embodiment, in the first wire saw cutting device 21 and the second wire saw cutting device 22, the cutting start portion in the vertical direction along the planned cutting surface C2 of the concrete floor slab 3 Fixed pulleys 62, 63, and 64, which prohibit cutting operations in the vertical direction, are arranged in the vicinity on the outer side of the concrete floor slab 3 and the wall railing 4, and on both inner sides of the bridge girders 2A and 2B, respectively.
Therefore, by driving the wire saw 23, both the first wire saw cutting device 21 and the second wire saw cutting device 22 can cut only the bridge girders 2A and 2B and the concrete slab 3 in the horizontal direction, respectively, and the concrete floor. The vertical cutting operation of the plate 3 and the wall railing 4 can be held in a prohibited state without starting.

In this way, at the work site for dismantling the floor slab, the vertical cutting operation of the concrete floor slab 3 and the wall railing 4 can be prohibited as necessary depending on the conditions and conditions of the site.

Then, the drive of the wire saw 23 is stopped, and the fixed pulleys 62, 63, and 64 are removed from the mounting members on the outer side of the concrete floor slab 3 and the wall railing 4 and both inner parts of the bridge girders 2A and 2B. By driving the wire saw 23 again, both the first wire saw cutting device 21 and the second wire saw cutting device 22 can cut the concrete floor slab 3 and the wall balustrade 4 in the vertical direction, respectively.

(Modification example 1)
FIG. 14 shows the floor slab cutting device 20 of the first modification, and in the first wire saw cutting device 21, the first driven roller 240, the second driven roller 241 and the third driven roller 241 arranged at the position of the bridge girder 2A in FIG. The driven roller 242 is removed, and the wire saw 23 is directly wound around the first drive pulley 210A and the fourth driven pulley 243.
Further, from the first wire saw cutting device 21 to the second driven wire saw cutting device 22, the sixth driven roller 245 is removed, and the wire saw 23 is connected to the fixed pulley 221 from the second drive roller 210B via the tenth driven roller 249. Is wrapped around.

In this way, by driving the wire saw 23, both the first wire saw cutting device 21 and the second wire saw cutting device 22 do not cut the concrete floor slab 3 and the wall balustrade 4 in the vertical direction, and the bridge girders 2A and 2B are used. A floor slab cutting device 20 that simultaneously cuts only the horizontal direction of the concrete floor slab 3 may be configured.

(Modification 2)
FIG. 15 shows the floor slab cutting device 20 of the second modification, and is fixed to both sides of the third bridge girder 2C in the configuration of FIG. 14 corresponding to the case where the bridge 1 is provided with the parallel third bridge girder 2C. The pulleys 65 and 66 are fixedly arranged by a mounting member (not shown).
Then, the wire saw 23 wound around the 8th fixed pulley 247 and the 9th fixed pulley 249 is pulled out above the 3rd bridge girder 2C, and the pulled out wire saw 23 is pulled out to the left and right fixed pulleys 65 and 66, respectively. After winding, it is extended to the cutting start position on the upper surface of the third bridge girder 2C.

In this way, by extending the wire saw 23 to the cutting start position on the upper surface of the third bridge girder 2C, only the three bridge girders 2A, 2B, 2C and the concrete floor slab 3 can be cut simultaneously in the horizontal direction. be able to.
Therefore, the work efficiency can be further improved by cutting wide and large.

(Modification 3)
FIG. 16 shows the floor slab cutting device 20 of the modified example 3, and the second driven pulley 241 and the third driven pulley 242, the fourth driven pulley 243, the fifth driven pulley 244, and the second wire saw cutting device of FIG. 7 are shown. 22 (drive pulley 220, fixed pulley 221, 7th driven pulley 246, 8th driven pulley 247, 9th driven pulley 248) is removed, and the wire saw 23 is inside the 10th driven roller 249 from the 2nd drive roller 210B. Is wrapped around.
A fixed pulley 67 similar to the sixth driven pulley 245 on the right side is fixedly arranged on the left side of the first bridge girder 2A with a mounting member (not shown).
Further, the wire saw 23 is extended from the 6th driven pulley 245 and the 10th driven pulley 249 to the cutting start position on the side of the planned cutting surface C2 of the concrete floor slab 3.

In this way, by driving the wire saw 23 only by the first wire saw cutting device 21, the bridge girders 2A and 2B and the concrete floor slab 3 are not cut in the horizontal direction, but only in the vertical direction of the concrete floor slab 3 and the wall railing column 4. A floor slab cutting device 20 may be configured to simultaneously cut each of the above.

As described above, the step of simultaneously cutting only the concrete floor slab 3 and the wall balustrade 4 in the vertical direction by using the floor slab cutting device 20 of the modified example 3 and the floor slab cutting device 20 of the above-mentioned modified example 1 precedes. , The step of cutting the bridge girders 2A and 2B and the concrete slab 3 at the same time only in the horizontal direction can be performed separately by the two units.

(Modification example 4)
FIG. 17 shows the floor slab cutting device 20 of the modified example 4, and in the configuration of FIG. 16, the drive pulley 220, the fixed pulley 221 and the ninth driven pulley 248 of the second wire saw cutting device 22 are arranged and the driven pulley 248 thereof is arranged. A fixed pulley 68 is fixedly arranged above the ninth driven pulley 248 with a mounting member (not shown).
Then, the wire saw 23 wound around the 9th driven pulley 248 and the fixed pulley 68, respectively, is placed on the side of the planned cutting surface C2 on the right side of the 9th driven pulley 248 of the concrete floor slab 3, and on the right side. It is stretched to the cutting start position on the outer side of 4.

In this way, by driving the wire saw 23 by the first wire saw cutting device 21 and the second wire saw cutting device 22, the bridge girders 2A and 2B and the concrete slab 3 are not cut in the horizontal direction, and the concrete slab 3 and the concrete slab 3 are not cut. A floor slab cutting device 20 that simultaneously cuts only the vertical direction of the left and right wall railings 4 may be configured.
In this case, the cutting width of the concrete floor slab 3 and the left and right wall railings 4 only in the vertical direction can be made long, and there is an advantage that a large wide concrete floor slab 3 can be cut.
In this way, by cutting wide and large, work efficiency can be further improved.

As described above, the step of simultaneously cutting only the concrete floor slab 3 and the wall balustrade 4 in the vertical direction by using the floor slab cutting device 20 of the modification 4 and the floor slab cutting device 20 of the modification 1 described above is preceded. , The step of cutting the bridge girders 2A and 2B and the concrete slab 3 at the same time only in the horizontal direction can be performed separately by the two units.

(Mobile factory)
18 and 19 show the configuration of the mobile factory 70, where 71 is a bellows type upper protection equipment, 72 is a tire type self-propelled equipment, 73 is a dust collector, and 74 is a lighting equipment.
As shown in the figure, the mobile factory 70 is an all-weather, soundproof and dustproof type, and has a bellows type upper protective equipment 71 that can expand and contract along the longitudinal direction of the concrete floor slab 3 and its bellows type upper protective equipment 71. Is provided with a tire-type self-propelled equipment 72 that moves the concrete floor slab 3 in the longitudinal direction, a dust collector 73 installed in the bellows-type upper protection equipment 71, a lighting equipment 74, and a ventilation device (not shown). There is.
The bellows type upper protective equipment 71 covers both sides of the upper and left and right wall railings 4 including the completely anhydrous first wire saw cutting device 21 and the second wire saw cutting device 22 on the concrete floor slab 3.

With such a mobile factory 70, for example, in the case of a bridge with one lane on each side with a narrow road vehicle width, the dust collector 73, the lighting equipment 74, and the bellows type upper protection equipment 71 incorporating the ventilation device completely cover the bridge. For example, it is possible to cut and remove the entire cross section with a width of 2 m, carry it out with a trailer, etc., and also support night work with two shifts.

(Embodiment 3)
20 and 21 show the floor slab cutting device 20 of the third embodiment, and as shown in the drawing, the third wire saw cutting device 81 and the fourth wire saw cutting device 91 are arranged below the concrete floor slab 3. One end of the wire saw 23 is fixed by the swing fixing tool 231 and the other end is fixed by the fixing tool 232.

That is, in the third wire saw cutting device 81, the housing 82, the drive pulley 83, and the drive device 83a thereof are arranged between the first bridge girder 2A and the second bridge girder 2B below the concrete floor slab 3. A wire saw 23 whose one end is fixed by a swing fixing tool 231 is wound around a drive pulley 83.
The wire saw 23 is sequentially wound around the fixed pulley 84A, the moving pulley 85A, the fixed pulley 86, the moving pulley 85B, and the fixed pulley 84B incorporated in the housing 82, and is further arranged on both sides of the bridge girder 2B on the right side. It is wound around the pulleys 87 and 88 in sequence.

Further, in the fourth wire saw cutting device 91, a drive pulley 93 and its drive device 93a are arranged below the concrete floor slab 3 between the second bridge girder 2B and the third bridge girder 2C, and are wound around the drive pulley 93. The wire saw 23 is wound around the driven pulley 94 and turned upward.
Then, the wire saw 23 is sequentially wound around the driven pulley 95, the fixed pulley 96A, the moving pulley 97A, the fixed pulley 98, the moving pulley 97B, and the fixed pulley 96B incorporated in the housing 22a of the second wire saw cutting device 22. , It is wound around the drive pulley 220 of the second wire saw cutting device 22.

One end of the wire saw 23 is fixed to the housing 21a of the first wire saw cutting device 21 with a swinging fixture 231 and the other end is fixed to the fixture 232 below the concrete floor slab 3. There is. The fixture 232 is fixed to the first bridge girder 2A via a mounting member (not shown).
After cutting the end of the concrete floor slab 3 including the wall plate 4 with the wire saw 23, the wire saw 23 comes into contact with the stopper roller 233 as shown by a virtual line in FIG.

In this way, the third wire saw cutting device 81 and the fourth wire saw cutting device 91 are newly arranged below the concrete floor slab 3, one end is fixed by the swinging fixture 231 and the other end. Also in the floor slab cutting device 20 using the wire saw 23 fixed with the fixture 232, the fixed pulley 61 or the fixed pulleys 62, 63, 64 for prohibiting cutting can be arranged as in the above-described first or second embodiment. Is.

(Modification 5)
FIG. 22 shows the floor slab cutting device 20 of the modified example 5, and the first wire saw cutting device 21 and the second wire saw cutting device 22 arranged on the concrete floor slab 3 of FIGS. 20 and 21 are removed. Then, the fourth wire saw cutting device 91 arranged under the concrete floor slab 3 is also removed, and the swing fixing tool 231 and the fixing tool 232 are also removed.
Then, under the concrete floor slab 3, two driven pulleys 89 and 90 for guiding the endless wire saw 23 are newly arranged.

That is, as shown in the figure, the endless wire saw 23 using only the third wire saw cutting device 81 is arranged on the driven pulley 88 arranged on the right side of the right bridge girder 2B and on the left side of the left bridge girder 2A. It is wrapped around a new driven pulley 89.
Further, between the left and right driven pulleys 88 and 89, the endless wire saw 23 passed through the core line cut portions 3b and 3d on the left and right bridge girders 2A and 2B of the concrete floor slab 3 has a concrete intermediate portion. It is guided from below by a new driven pulley 90 arranged under the floor slab 3.

In this way, without arranging the first wire saw cutting device 21 and the second wire saw cutting device 22 on the concrete floor slab 3 on the upper surface of the road, only the third wire saw cutting device 81 arranged under the concrete slab 3 By using the endless wire saw 23, only the horizontal direction of the bridge girders 2A and 2B and the concrete slab 3 can be cut at the same time.
Therefore, in the daytime, the third wire saw cutting device 81 is arranged under the concrete slab 3 in a state where the vehicle is allowed to pass without road regulation, and the bridge girders 2A and 2B and the concrete slab 3 are cut in the horizontal direction. Only can be done, and the construction period can be shortened.

As described above, in order to arrange the third wire saw cutting device 81 under the concrete floor slab 3 in the daytime without road regulation, the bridge girder of the concrete floor slab 3 is used. Small-diameter holes (core line cut portions 3b and 3d) for passing the wire saw 23 are drilled on 2A and 2B, and the core line cut portions 3b and 3d are cured so as not to interfere with vehicle running. ..
Further, the vertical cutting of the concrete floor slab 3 and the left and right wall railings 4 is performed at night by traffic regulation by using the floor slab cutting device of the above-mentioned modified example 3 or 4.

As described above, according to the floor slab cutting device 20 of the modified example 5, the construction period can be shortened by increasing the daytime work.
Moreover, traffic congestion can be reduced by avoiding daytime traffic restrictions.

(Other variants)
In the above embodiments and modifications, the floor slab cutting device having a guide roller is used, but the guide roller may not be provided.

1 Bridge 2 Bridge girder 2A 1st bridge girder 2B 2nd bridge girder 2C 3rd bridge girder 2a Jibel 3 Concrete floor slab 3a Block 4 Wall balustrade 10 Mobile stage 10S Work space 11 Stage body 11d Opening 12 Leg 13 Protective work 13a Rotating member 15 Lower protection work 20 Floor slab cutting device 21 1st wire saw cutting device 210 Drive pulley 211 Fixed pulley 212 Moving pulley 22 2nd wire saw cutting device 220 Drive pulley 221 Fixed pulley 23 Wire saw 24 Driven pulley 240 1st driven pulley 241 First 2 Driven pulley 242 3rd driven pulley 243 4th driven pulley 244 5th driven pulley 245 6th driven pulley 246 7th driven pulley 247 8th driven pulley 248 9th driven pulley 249 10th driven pulley 25 Guide roller 30 Floor slab lifting Means 40 Dust collecting means 50 Power generating means 61 Fixed pulley 62 Fixed pulley 63 Fixed pulley 64 Fixed pulley 65 Fixed pulley 66 Fixed pulley 67 Fixed pulley 68 Fixed pulley 70 Mobile factory 71 Bellows type upper protection equipment 72 Tire type self-propelled equipment 73 collection Dust device 74 Lighting equipment 81 Third wire saw cutting device 83 Drive pulley 84 Fixed pulley 85 Moving pulley 86 Fixed pulley 87 Driven pulley 88 Driven pulley 89 Driven pulley 90 Driven pulley 91 Fourth wire saw cutting device 93 Drive pulley 94 Driven pulley 95 Driven pulley 96 Fixed pulley 97 Moving pulley 98 Fixed pulley C1 Joint boundary surface C2 Planned cutting surface

Claims (8)

A wire saw that is laid on the bridge girder and extends continuously in the direction along the joint interface between the concrete slab and the bridge girder that constitutes the road surface of the bridge, and in the width and thickness directions of the concrete slab, and the wire saw. In a floor slab cutting device provided with a plurality of pulleys for guiding the concrete in the traveling direction along the extension route and driving the concrete.
The joint between the bridge girder and the concrete slab by driving the wire saw while guiding the wire saw in the traveling direction in the vicinity of the cutting start portion in the direction along the joint interface between the bridge girder and the concrete slab. A floor slab cutting device characterized by arranging a fixed pulley that prohibits cutting operations in the direction along the boundary surface. The floor slab cutting device according to claim 1, wherein the fixed pulleys are arranged on both side portions of the bridge girder. A method for cutting a floor slab using the floor slab cutting device according to claim 1 or 2.
A fixed pulley for guiding the wire saw in the traveling direction is arranged in the vicinity of the cutting start portion in the direction along the joint boundary surface between the bridge girder and the concrete floor slab.
A floor slab cutting method comprising prohibiting a cutting operation in a direction along the joint boundary surface between the bridge girder and the concrete floor slab driven by the wire saw. After cutting the concrete slab in the width direction and the thickness direction by driving the wire saw,
Remove the fixed pulley and
The floor slab cutting method according to claim 3, wherein the bridge girder and the concrete floor slab are cut in a direction along the joint boundary surface by driving the wire saw. A wire saw that is laid on the bridge girder and extends continuously in the direction along the joint interface between the concrete slab and the bridge girder that constitutes the road surface of the bridge, and in the width and thickness directions of the concrete slab, and the wire saw. In a floor slab cutting device provided with a plurality of pulleys for guiding the concrete in the traveling direction along the extension route and driving the concrete.
Along the width direction and the thickness direction of the concrete slab by driving the wire saw while guiding the wire saw in the traveling direction in the vicinity of the cutting start portion in the width direction and the thickness direction of the concrete slab. A floor slab cutting device characterized by arranging a fixed pulley that prohibits cutting operation in the direction. The floor slab cutting device according to claim 5, wherein the fixed pulley is arranged at at least one end of a planned cutting surface in the width direction and the thickness direction of the concrete floor slab. A method for cutting a floor slab using the floor slab cutting device according to claim 5 or 6.
A fixed pulley for guiding the wire saw in the traveling direction is arranged near the cutting start portion in the width direction and the thickness direction of the concrete slab.
A floor slab cutting method comprising prohibiting a cutting operation in a direction along a width direction and a thickness direction of the concrete slab by driving the wire saw. After cutting the joint interface between the bridge girder and the concrete slab by driving the wire saw,
Remove the fixed pulley and
The floor slab cutting method according to claim 7, wherein the concrete floor slab is cut in the width direction and the thickness direction by driving the wire saw.

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