JP2020063608A - Floor slab cutter and floor slab cutting method - Google Patents

Abstract

To provide a floor slab cutter using a wire saw which extends continuously in a direction along a joint boundary surface between a bridge girder and a concrete slab and in width and thickness directions of the concrete slab, which is capable of prohibiting a cutting operation in the direction along the joint interface between the bridge girder and the concrete slab if necessary.SOLUTION: A floor slab cutter 20 includes: a wire saw 23 that extends continuously in the direction along the joint boundary surface between a bridge girder 2 and a concrete slab 3 and in the width and thickness directions of the concrete slab 3; and multiple pulleys for guiding and driving the wire saw 23 in a traveling direction along its extension route. In the vicinity of a cutting start part in the direction along a joint boundary C1 between the bridge girder 2 and the concrete slab 3, a fixed pulley 61 is arranged which prohibits the cutting operation in the direction along the joint boundary surface C1 between the bridge girder 2 and the concrete slab 3 by the drive of the wire saw 23 while guiding the wire saw 23 in the traveling direction.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD 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.

The applicant of the present invention is a dismantling system for dismantling and removing a concrete floor slab that is laid on a bridge girder and constitutes a road surface of the bridge in Patent Document 1, and is movable along the extending direction of the bridge. We proposed a new movable stage and a floor slab cutting device installed in the work space between the movable stage and the part of the concrete floor slab that is dismantled into blocks.
The floor slab cutting device is an endless wire saw that is continuously extended in the direction along the joint boundary surface between the bridge girder and the concrete floor slab, and in the width and thickness directions of the concrete floor slab, and the wire saw. And a plurality of pulleys for guiding and driving in a traveling direction along the set route.

JP, 2018-87418, A

The floor slab cutting device of Patent Document 1 simultaneously cuts a direction (horizontal direction) along a joint boundary surface between a bridge girder and a concrete floor slab and a width direction and a thickness direction (vertical direction) of the concrete floor slab with a wire saw. However, it was impossible to prohibit the horizontal cutting operation of the bridge girder and the concrete floor slab if necessary during the vertical cutting of the concrete floor slab.
That is, depending on the various conditions and conditions of the site, for example, it may be possible 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 a floor slab cutting device using a wire saw that is continuously extended in a direction along a joint boundary surface between a bridge girder and a concrete floor slab and in a width direction and a thickness direction of the concrete floor slab, if necessary. Therefore, it is possible to prohibit the cutting operation in the direction along the joint boundary surface between the bridge girder and the concrete floor slab.
Moreover, this invention makes it a subject to make it possible to prohibit the cutting operation | movement of the width direction and thickness direction of a concrete floor slab as needed.

In order to solve the above problems, the invention described in claim 1 is
A wire saw laid on the bridge girder and continuously extending in the width direction and the thickness direction of the concrete slab and the direction along the joint boundary surface between the concrete slab and the bridge girder constituting the road surface of the bridge. In a floor slab cutting device including a plurality of pulleys for guiding and driving the traveling direction along the extension route,
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, while guiding the wire saw in the traveling direction, the joining of the bridge girder and the concrete floor slab by driving the wire saw. It is characterized by arranging a fixed pulley that prohibits a cutting operation in a direction along the boundary surface.

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

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

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

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

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

The invention according to claim 7 is
A floor slab cutting method using the floor slab cutting device according to claim 5,
In the vicinity of the cutting start part in the direction along the width direction and the thickness direction of the concrete floor slab, a fixed pulley for guiding the wire saw in the traveling direction is arranged,
The cutting operation in the width direction and the thickness direction of the concrete floor slab by driving the wire saw is prohibited.

The invention described in claim 8 is
The floor slab cutting method according to claim 7,
After cutting the joint boundary surface between the bridge girder and the concrete floor slab by driving the wire saw,
Remove the fixed pulley,
Driving the wire saw cuts the concrete floor slab in a direction along the width direction and the thickness direction.

According to the present invention, in a floor slab cutting device using a wire saw continuously extending in the direction along the joint boundary surface between the bridge girder and the concrete floor slab and in the width direction and the thickness direction of the concrete floor slab, if necessary. Therefore, the cutting operation in the direction along the joint boundary surface between the bridge girder and the concrete floor slab can be prohibited.
Further, according to the present invention, the cutting operation in the width direction and the thickness direction of the concrete floor slab can be prohibited as necessary.

It is a perspective view showing composition of one embodiment of a floor slab cutting device to which the present invention is applied. It is a side view which shows the outline of the disassembly system of a concrete floor slab. It is a top view which shows the outline of the disassembly system of a concrete floor slab. It is a top view which shows a telescopic scaffold. It is an expanded sectional view which shows the disassembly system of the place where disassembly and removal work are performed. It is an expanded sectional view which shows the disassembly system of the place where disassembly and removal work are performed. It is a perspective view showing an outline of a floor slab cutting device and a concrete floor slab to be cut. It is a front view showing a slab cutting device and a concrete slab to be cut. It is a top view which shows the floor slab cutting device and the concrete floor slab to be cut. FIG. 5 is a partially enlarged view showing a driven pulley arranged around the first bridge girder and a peripheral structure. It is a front view which shows the floor slab cutting device and the cut concrete floor slab. It is a side view which shows the outline of the disassembly system of a concrete floor slab. It is a schematic perspective view which shows the floor slab cutting device of Embodiment 2. It is a schematic perspective view which shows the floor slab cutting device of the modified example 1. It is a schematic perspective view which shows the floor slab cutting device of the modified example 2. It is a schematic perspective view which shows the floor slab cutting device of the modification 3. It is a schematic perspective view which shows the floor slab cutting device of the modified example 4. It is a schematic plan view (a) and schematic front view (b) which show the structure of a mobile factory. It is a vertical front view of the mobile factory of FIG. It is a schematic plan view which shows the floor slab cutting device of Embodiment 3. It is a vertical front view of the floor slab cutting device of FIG. It is a schematic plan view which shows the floor slab cutting device of the modification 5.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  However, various technically preferable limitations for carrying out the present invention are added to the embodiments described below, but the technical scope of the present invention is not limited to the following embodiments and illustrated examples. Absent.

First, in FIG. 2, which shows an outline of a concrete floor slab dismantling system to which the floor slab cutting apparatus of the present invention is applied, reference numeral 1 indicates a bridge. The bridge 1 is, for example, a viaduct on which railways and roads are constructed, and the bridge 1 in the present embodiment refers to a viaduct on which roads are constructed.
The bridge 1 that is a viaduct includes a plurality of bridge girders 2 that are installed between bridge piers (not shown), and a concrete floor slab 3 that is laid on the plurality of bridge girders 2 and that constitutes the road surface of the bridge 1.
Although the bridge 1 in the present embodiment has been described as a viaduct, it is not limited to this and other types of bridges may be adopted without departing from the spirit of the present invention.

A concrete wall balustrade 4 is provided at a side edge portion of the concrete floor slab 3. The wall balustrade 4 is provided integrally with the concrete slab 3 and can be dismantled at the same time as the concrete slab 3.
In addition, the concrete floor slab 3 is formed by concrete placing in a state including a plurality of dowels 2a (for example, headed stud dowels) provided so as to project on the upper surface of the bridge girder 2 when the bridge 1 is constructed. . Therefore, the concrete floor slab 3 is in a state of being joined to the bridge girder 2 via a plurality of dowels 2a. A surface where the bridge girder 2 and the concrete floor slab 3 are bonded to each other in this manner is referred to as a bonding boundary surface C1.

The concrete floor slab 3 constitutes the road surface of the bridge 1, and many vehicles normally pass through. Therefore, bridge repair work will be performed in a timely manner as it deteriorates over time and is damaged by traffic loads that are larger than the design load.
Since the bridge repair work is often performed in a long section along the extension direction of the bridge 1, the concrete floor slab 3 in the planned repair work section is divided into multiple areas (disassembly points) and dismantled / removed. Work shall be performed.
In addition, such a bridge renovation work includes the case where all the passage of the bridge 1 is stopped and the concrete floor slab 3 is disassembled and removed all at once in the width direction of the bridge 1, and the passage of a part of the bridge 1. There is a case where a part of the concrete floor slab 3 is dismantled / removed by stopping just that, and the dismantling system of the present invention can cope with both cases.
In addition, in this embodiment, a case where only a part of the bridge 1 is stopped and a part of the concrete floor slab 3 is dismantled / removed is described, but all the passage of the bridge 1 is stopped and the bridge 1 is removed. The same work process is performed when the concrete floor slab 3 is disassembled and removed all at once in the width direction.

The dismantling system according to the present embodiment is for performing dismantling / removing work of the concrete floor slab 3 in bridge repair work, and includes a movable stage 10, a floor slab cutting device 20, a floor slab lifting means 30, and a collecting unit. The dust means 40, the power generation means 50, and the control means are provided.
The concrete floor slab 3 is dismantled and sequentially disassembled by such a disassembling system so that the concrete slab 3 has a size that can be loaded on the transport vehicle T (see FIG. 12). In addition, the wall balustrade 4 is also included in the part dismantled by the dismantling system. Such a disassembled (or disassembled) portion of the concrete floor slab 3 is hereinafter referred to as a block 3a.

As shown in FIGS. 2 and 3, the movable stage 10 is equipped with the above-mentioned respective means for performing the dismantling / removal work of the concrete floor slab 3, and the extension direction of the bridge 1 in the state in which these respective means are mounted. The stage main body 11, the legs 12, the protective work 13, the lower protective suspension scaffolding 16, the protective fence 17, and the dust collector storage 18 are provided.
In addition, in such a movable stage 10, after cutting the concrete floor slab 3 to separate 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 at the location where the dismantling and removal work will be performed next.

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 11 a arranged vertically and horizontally in a plan view. The legs 12 are supported above the road surface of the bridge 1 (for example, at a height of about 2.5 m).
A fence 11b and a ramp 11c for moving up and down between the road surface of the bridge 1 and the stage body 11 are provided on the periphery of the stage body 11.
In addition, as shown in FIG. 3, the stage body 11 is formed of a plurality of steel frames 11a arranged vertically and horizontally and has an opening 11d formed at a position located above a working space 10S described later. The stage body 11 is composed of, for example, a wire mesh such as expanded metal, and has a floor portion provided at a position excluding the opening 11d.
Further, among the plurality of steel frames 11a, two steel frames 11a, 11a located above a work space 10S described later are provided so as to project to the outside of the bridge 1 (to the outside of the wall balustrade 4).

As shown in FIGS. 2 and 3, among the plurality of steel frames 11a forming the stage body 11, the leg portions 12 are respectively provided on the lower surfaces of the four places capable of supporting the stage body 11 and the respective means in a well-balanced manner. .
Wheels 12 a are provided at the lower ends of the legs 12 to move the stage body 11 along the extending direction of the bridge 1.

As shown in FIGS. 2 to 6, the guard 13 is located outside the bridge 1 while being connected to the stage body 11, and extends from the side to the bottom of the concrete floor slab 3 to be cut by the floor slab cutting device 20. It is arranged. Since the protector 13 is disposed from the side of the concrete floor slab 3 to the lower side, the protector 13 functions as a scaffold for work and as a safety facility for the side and the bottom.
The protector 13 has an upper protector 14 and a lower protector 15, and the upper protector 14 and the lower protector 15 are connected to each other via the rotating member 13a.

The upper protector 14 is a skeleton structure formed of a plurality of metal materials, and is integrated with the above-mentioned steel frames 11a, 11a protruding outside the bridge 1 among the steel frames 11a forming the stage body 11. It is connected.
The rotating member 13a is provided at the center of the lower end of the upper protector 14.

The lower protector 15 is a skeleton structure made of a plurality of metal materials, and is located below the concrete floor slab 3.
Further, as shown in FIGS. 4 to 6, the lower protector 15 is provided with a telescopic scaffold 15a that is provided at the lower end portion of itself and that expands and contracts in the horizontal direction. The lower protector 15 is provided with the telescopic scaffold 15a, and thus is formed in a substantially L shape in a side view. In addition, the telescopic scaffold 15a has a floor portion made of, for example, a metal net such as expanded metal.
The rotating member 13a is provided at the center of the upper end of the lower armor 15. The lower armor 15 can be horizontally turned by the rotating member 13a.

The lower protective suspension scaffolding 16 is arranged from the side of the concrete floor slab 3 to be dismantled / removed to the lower side, and is suspended inside the protective work 13 by a suspending 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 of the concrete floor slab 3 to the lower side, the lower protective suspension scaffold 16 functions as a scaffold at the time of work and further as a safety equipment for the side and the bottom.

The working space 10S refers to a space between the movable stage 10 and a portion (block 3a) of the concrete floor slab 3 to be disassembled in a block shape, and is located below an opening 11d formed in the stage body 11. To position.
Around the work space 10S, a protection fence 17 is provided for preventing the work space 10S from entering the work space 10S and for suppressing dust scattering generated during the cutting work of the floor slab cutting device 20. In addition, the protection fence 17 shall be provided in four circumferences of the work space 10S.

  The dust collector housing portion 18 is provided on the lower surface of the stage body 11 and can house a plurality of dust collectors 40 described later. Further, the dust collector housing 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 a work space 10S between the movable stage 10 and a portion (block 3a) of the concrete floor slab 3 to be disassembled into blocks. , For cutting the concrete floor slab 3 into blocks.
The floor slab cutting device 20 in the present embodiment is driven to travel by the first wire saw cutting device 21, the second wire saw cutting device 22, and the first wire saw cutting device 21 and the second wire saw cutting device 22. 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, and depending on the cutting location A plurality of driven pulleys 24 that are arranged in parallel and a guide roller 25 are provided.
The first wire saw cutting device 21 is installed above the bridge girder 2 (hereinafter referred to as 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), which is located inside one bridge girder 2A.

The wire saw 23 is continuously extended in the direction along the joint boundary surface C1 between the bridge girder 2 (the first bridge girder 2A, the second bridge girder 2B) and the concrete floor slab 3 and the width direction and the thickness direction of the concrete floor slab 3. ing.
The plurality of pulleys 210, 211, 212, 220, 221 built in the first wire saw cutting device 21 and the second wire saw cutting device 22 and the plurality of driven pulleys 24 move the wire saw 23 along its extension path. It guides the vehicle in the traveling direction and drives 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, the plurality of pulleys 210, 211 and 212 are assumed to be housed in the housing 21a. That is, the plurality of pulleys 210, 211 and 212 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, in addition to the plurality of built-in pulleys 210, 211, and 212, includes a cooling device that cools the wire saw 23, and is necessary for dismantling and removing the concrete floor slab 3. It has various devices and functions.

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

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

The moving pulley 212 is movable between the first driving pulley 210A and the second driving pulley 210B upward (movable up and down) and is rotatable, and the second moving pulley 212A and the second moving pulley 212A are rotatable. And 212B.
The wire saw 23 is wound around the movable pulleys 212 </ b> A and 212 </ b> B alternately with the fixed pulley 211, and tension can be applied to the wire saw 23 by moving the movable pulleys 212 </ b> A and 212 </ b> B so as to widen the distance between the movable pulley 212 </ b> A and 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 that cools the wire saw 23, and various types required for dismantling and removing the concrete floor slab 3. Shall have the following devices and functions.
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 apply tension to the wire saw 23 not only by causing the wire saw 23 to travel at high speed but also by moving in the vertical direction. The rotation speed of the drive pulley 220 is equal 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 effectively functions when tension is applied to the wire saw 23 that relaxes as the cutting work progresses.

  As shown in FIGS. 7 to 10, the plurality of driven pulleys 24 are connected to the first driven pulley 240 that is provided subsequent to the first drive pulley 210 </ b> A in the first wire saw cutting device 21, and are connected to the second wire saw cutting device 22. Via the 10th driven pulley 249 provided in front of the 2nd drive pulley 210B in the 1st wire saw cutting device 21, it is provided.

The first driven pulley 240 is attached to the lower end portion of the first wire saw cutting device 21 via a mounting 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 delivered from the first wire saw cutting device 21 is extended 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 that wraps around the wall balustrade 4 and below the concrete floor slab 3. The second driven pulley 241 is attached to the first bridge girder 2A via the attachment member 241a.
The wire saw 23 is wound around 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, the work of cutting the concrete floor slab 3 outside the first bridge girder 2A is performed. 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. The mounting member 242a is integrally formed with the mounting member 241a of the second driven pulley 241.
The wire saw 23 is wound around the lower side of the third driven pulley 242 and extended in a state of being 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. The mounting member 243a is integrally configured 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 in a state of being horizontally extended in the length direction of the first bridge girder 2A. The wire saw 23 paid out from the fourth driven pulley 243 is extended in a state of being 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 floor slab 3. There is.

The fifth driven pulley 244 is provided inside the outermost first bridge girder 2A (on the center side of the bridge 1) and inside the planned cutting plane 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 can be performed. It can be carried out. At this time, the plurality of dowels 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 an intermediate point between the fifth driven pulley 244 and a seventh driven pulley 246 described later.
The wire saw 23 is extended to be in contact with the upper side of the sixth driven pulley 245. That is, the sixth driven pulley 245 is provided at an intermediate point between the fifth driven pulley 244 and a seventh driven pulley 246, which will be described later, for suppressing 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 seventh driven pulley 246 is positioned opposite to the fifth driven pulley 244.
The wire saw 23 fed from the fifth driven pulley 244 is wound around the seventh driven pulley 246 via the sixth driven pulley 245, and the wire saw 23 fed from the seventh driven pulley 246 is , The second bridge girder 2B and the concrete floor slab 3 are 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 plane 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 seventh driven pulley 246 and the eighth driven pulley 247, the cutting work at the joint boundary surface C1 between the second bridge girder 2B and the concrete floor slab 3 can be performed. It can be carried out. At this time, the plurality of dowels 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 portion 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 3c. It is provided inside (described later). Further, the ninth driven pulley 248 is arranged at a position / direction where the wire saw 23 can be paid out along the planned cutting plane 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 extends in a state of being drawn upward. The wire saw 23 fed upward is wound around the drive pulley 220 incorporated in the second wire saw cutting device 22.

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

The tenth driven pulley 249 is attached to the lower end portion of the first wire saw cutting device 21 via a mounting 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 fed 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 fed from the second drive pulley 210B is alternately wound around each fixed pulley 211 (211A, 211B, 211C) and each moving pulley 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 floor slab 3 can be cut by traveling along the above-described extended route.
Since the wire saw 23 relaxes as the cutting work progresses, the moving pulleys 212 (212A, 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. The tension is applied to the wire saw 23.

As shown in FIG. 9 and FIG. 10, the guide roller 25 has its 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. 2B is arranged so as to be in contact with the lower surface of the wire saw 23 protruding outside the both side edges at both upper ends. The guide roller 25 as described above is configured to be rotatable around its axis in accordance with the traveling of the wire saw 23.
That is, the guide roller 25 is a wire saw 23 wound around the fourth driven pulley 243 and the fifth driven pulley 244 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 seventh driven pulley 246 and the eighth 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 traveling of 23.
The fourth driven pulley 243 and the fifth driven pulley 244 are horizontally separated from the upper end of the first bridge girder 2A, and the seventh driven pulley 246 and the eighth driven pulley 247 are horizontally separated from the upper end of the second 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 in a state of opening in a “C” shape toward the pulleys 243, 244, 246, and 247. Further, as the cutting work progresses, the wire saw 23 gradually approaches the pulleys 243, 244, 246, 247, so that the portion of the wire saw 23 where bending should be suppressed gradually changes as the cutting work progresses. . The guide roller 25 is formed to be long in order 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 traveling, the traveling of the wire saw 23 can be guided.
The guide rollers 25 are the first guide roller 25A and the second guide roller 25B along the upper edges of the first bridge girder 2A and the second guide rollers 25B, and the third guide rollers 25C along the both edges of the upper end of the second bridge girder 2B. And a fourth guide roller 25D.
The guide rollers 25A, 25B, 25C, 25D are fixed to the first bridge girder 2A and the second bridge girder 2B via a support member 26.

Since the concrete floor slab 3 is in a state of being laid on the first bridge girder 2A and the second bridge girder 2B, the concrete floor slab 3 from which the block 3a has been cut off by the floor slab cutting device 20 is the same as the first bridge girder 2A. There will be places that do not appear on any of the two bridge girders 2B.
In order to ensure that the concrete floor slab 3 can be supported even if such a location occurs, the second bridge girder 2B is provided with a reinforcing vertical girder 27 via a diagonal member 27a as shown in FIG. ing. The reinforcing vertical girders 27 are provided in advance along the places where the concrete floor slab 3 is dismantled and removed. Further, the installation work of the reinforcing vertical girders 27 may be performed by using the protective work 13 or the lower protective suspension scaffold 16 as a work scaffold after the protective work 13 or the lower protective suspension scaffold 16 is installed.

The floor slab lifting means 30 is mounted on the movable stage 10 and lifts the block 3a of the concrete floor slab 3 separated from other parts by the floor slab cutting device 20. In the present embodiment, a jib crane is adopted, and is fixed to the steel frame 11a so as to be positioned on the plurality of steel frames 11a forming the stage body 11.
The hook of the jib crane, which is the floor slab lifting means 30, can be inserted into the working space 10S through the opening 11d of the stage body 11.
Although the floor slab lifting means 30 in the present embodiment employs a jib crane, it is not limited to this. That is, a crane that can be fixed to the stage body 11, can lift the block 3a, and can lift and rotate the block 3a may be used.

The dust collecting means 40 is for sucking dust generated when the concrete slab 3 is cut by the floor slab cutting device 20, and includes a plurality of dust collectors 40.
The plurality of dust collectors 40 are housed in the dust collector housing portion 18 provided on the lower surface of the stage 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 a place where dust is generated, such as in the work space 10S or the lower protective suspension scaffold 16.

  The power generation unit 50 is a power supply device that is arranged on the upper surface of the stage body 11 adjacent to the floor slab lifting unit 30. The power supply device 50 includes a power transmission cable (not shown) and is wired toward a device that requires 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 that compose the above dismantling system, and communicates with the various means. be able to. With this, it is possible to perform remote control of various means constituting the disassembly system, and it is possible to improve safety during work.
A camera is installed around the movable stage 10 and the work site so that the worker can remotely monitor.

  Next, a method for disassembling the concrete floor slab 3 forming the road surface of the bridge 1 by the disassembling system having the above-described configuration will be described.

In carrying out the repair work on the bridge 1, first, as shown in FIGS. 2 and 3, the road cone 5 and the regulation bar 6 are used to regulate the lanes of the bridge 1.
However, in the repair work of the bridge 1 in the present embodiment, only a part of the bridge 1 is stopped and the concrete floor slab 3 is partially disassembled and removed, and the bridge 1 extends in the width direction. When the concrete floor slab 3 is dismantled and removed all at once, the bridge 1 is closed.

Then, the movable stage 10 is arranged so as to form a work space 10S between the concrete floor slab 3 and a site (block 3a) to be separated from other sites by the floor slab cutting device 20.
More specifically, the mobile stage 10 is assembled at the site of the repair work surrounded by the load 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 attached to the mobile stage. Mounted on 10.
When the movable stage 10 is assembled, the protector 13 is also assembled and connected to the stage 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 lower girder 15 of the girder 13 or the lower girder suspension scaffold 16 is used to install the reinforcing vertical girder 27 on the second bridge girder 2B. The reinforcement girders 27 are installed on the lower protection worker 15 or the lower protection suspension scaffold 16 by using, for example, a wire rope and a pulley.
During installation work of the reinforcement girders 27 and during cutting work of the concrete floor slab 3, as shown in FIGS. 4 and 5, the telescopic scaffold 15a of the lower guard 15 is extended.

Subsequently, in the concrete floor slab 3, a portion which is included in the peripheral portion of the block 3a to be separated from other portions and is located on the first bridge girder 2A and the second bridge girder 2B is a diamond bit (not shown) The hole is continuously drilled (see FIG. 9 etc.).
As a result, the 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 the core line cut portions 3d and 3e are formed at two locations on the second bridge girder 2B. Is formed.
Moreover, 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 are separated. 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 balustrade 4) are cut by a cutting machine (not shown). As a result, the inter-core cut portion 3f is formed.
Further, the boundary 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 location that remains) is extended by the cutting machine (not shown) in the extending direction of the bridge 1 (the repair work is performed). Cut along the direction of extension of the portion: the direction of 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 of the core line cut portions 3d and 3e located on the second bridge girder 2B on the center side of the bridge 1 corresponds to the end of the block 3a on the center side of the bridge 1 removed. Similarly, the boundary cut portion 3g corresponds to the central side of the bridge 1 in the block 3a to be removed.

  Subsequently, the 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 shafts of the guide rollers 25 (25A, 25B, 25C, 25D) are also in a state of being along both side edges at the upper end portions 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 floor slab 3 via the support base 21b.
Furthermore, 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 floor slab 3 and the width direction and the thickness direction of the concrete floor slab 3.
That is, the driven pulleys 240 to 249 are arranged at predetermined positions and orientations. The endless wire saw 23 is connected to the pulleys 210, 211 and 212 built in the first wire saw cutting device 21, the pulleys 220 and 221 built in the second wire saw cutting device 22, and the driven wheels. Wrap around the pulleys 240 to 249.
At this time, the wire saw 23 is also hooked on the upper end of the wall balustrade 4 and passed through the core line cut portions 3b to 3e.
Further, the wire saw 23 is in contact with each guide roller 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.

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

Subsequently, the drive pulleys 210A, 210B, 220 in the first wire saw cutting device 21 and the second wire saw cutting device 22 are rotated to drive the wire saw 23 to run along the extending direction. 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 are provided. The cutting work is performed while moving the above to maintain the tension enough 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 to generate heat from the wire saw 23. Suppress.

By driving and driving the wire saw 23 in this manner, the concrete floor slab 3 can be cut and disassembled into blocks. That is, the block 3a can be separated from other parts of the concrete floor slab 3, as shown in FIG.
Note that, while the floor slab cutting device 20 is cutting the concrete floor slab 3, 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 and the second wire saw cutting device 22, the wire saw 23, and the driven pulleys 240 to 249 are removed. The removed devices 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 movable stage 10 by using a jib crane 30 or the like.

The block 3a separated from the other parts is hoisted 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 body 11, the block 3a is lifted upward by the jib crane 30 through the opening 11d.
On the other hand, when the size of the block 3a cannot pass through the opening 11d, the movable stage 10 is once moved in the working direction while being lifted to a height that can be retained in the working space 10S, and then moved to the next planned dismantling position. The block 3a is temporarily placed. Then, the movable stage 10 is further moved in the working direction to bring the block 3a out of the working space 10S, and then the hoisting device is 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 portions of the first bridge girder 2A and the second bridge girder 2B where the block 3a has been removed are cleaned and the adhering concrete is removed.
It should be noted that this work may be carried out collectively after the dismantling / removing work of the concrete slab 3 in all the planned repair work sections.

After that, the movable stage 10 is moved so that the work space 10S is located above the next planned dismantling site, and the above-described work process is repeated to dismantle and remove all the concrete floor slabs 3 in the planned repair work section. Do the work.
If there is a bridge pier in the planned repair work section, lower protector 15 in protector 13 is rotated 90 degrees or 180 degrees through rotating member 13a to prevent lower protector 15 from coming into contact with the bridge pier. . 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, after the dismantling / removal work of all the concrete floor slabs 3 in the rehabilitation scheduled area, new floor slabs such as steel floor slabs and precast concrete floor slabs manufactured in the factory are installed in advance. .
The 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 movable stage, and the floor slab lifting means is mounted on the movable stage. It can be collected together on the stage and its vicinity. Therefore, the respective means hardly interfere with each other's work, and it is possible to prevent the respective means from hindering the movement of the moving stage. Further, since the floor slab cutting device 20 has the wire saw 23 continuously extending 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 dismantling and removing work of the concrete floor slab 3 can be performed efficiently.

  In addition, the floor slab cutting device 20 has a rotating shaft extending along both side edges of the bridge girder 2 (2A, 2B) at the upper end thereof, and of the wire saw 23 protruding outside the both side edges of the upper end of the bridge girder 2. Since the guide roller 25 (25A, 25B, 25C, 25D) arranged so as to contact the lower surface is provided, and the guide roller 25 is configured to be rotatable around the axis in accordance with the traveling of the wire saw 23, It is possible to guide the traveling 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 floor slab 3 can be performed accurately.

  In addition, the dismantling system includes a plurality of dust collectors 40 mounted on the movable stage 10 and sucking dust generated when the concrete slab 3 is cut by the floor slab cutting device 20, and thus, for example, the work space 10S and the lower protection. It is possible to reliably aspirate the dust generated particularly in the place where dust is generated, such as in the suspension scaffolding 16 or in other necessary places. As a result, it is possible to suppress the scattering of dust to the surroundings, and therefore it is possible to perform dismantling and removal work in consideration of the surrounding environment.

Further, the movable stage 10 has a protector 13 which is connected to the stage main body 11 and is located outside the bridge pier and is arranged from the side to the bottom of the concrete floor slab 3 to be cut by the floor slab cutting device 20. Therefore, the protector 13 functions as a scaffold during work and also as a safety device for the side and the lower side, and the safety during work can be improved.
In addition, since the lower protection 15 which is a part of the protection 13 located below the concrete floor slab 3 is configured to be horizontally rotatable with respect to the upper protection 14, it is included in the planned repair work section. When there is a pier, by rotating this lower protector 15, it is possible to prevent contact with the pier. Therefore, even if there are bridge piers in the rehabilitation work scheduled section, the movable stage 10 can be moved, so that the concrete floor slab 3 can be disassembled and removed without delay.

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

That is, in the illustrated example, in the first wire saw cutting device 21 and the second wire saw cutting device 22, in the vicinity of the front position of the horizontal cutting start portion along the joint boundary surface C1 between the bridge girders 2A and 2B and the concrete floor slab 3. A rotatable fixed pulley 61 for prohibiting a horizontal cutting operation along each joint boundary surface C1 is fixed to both sides of the bridge girders 2A and 2B by mounting members (not shown).
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 in the vicinity of the front position of the cutting start portion of the bridge girder 2A. It is wound 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 front position of the cutting start portion of the bridge girder 2B. It is wound around the fixed pulley 61 of.

  By arranging the fixed pulley 61 in this way, by driving the wire saw 23, the first wire saw cutting device 21 and the second wire saw cutting device 22 both 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 floor slab 3 is not started, but is kept in the prohibited state.

After that, the driving of the wire saw 23 is stopped, and the fixed pulleys 61 are removed from the attachment members on both sides of the bridge girders 2A and 2B, respectively.
Thereby, as shown in FIG. 7, both the first wire saw cutting device 21 and the second wire saw cutting device 22 perform horizontal cutting along the joint boundary surface C1 between the bridge girders 2A and 2B and the concrete floor slab 3, respectively. 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 in the horizontal direction along the joint boundary surface C1 between the bridge girders 2A and 2B and the concrete floor slab 3, respectively.

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. Fixed pulleys 61 for prohibiting the respective horizontal cutting operations are arranged near the cutting start portion 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. The horizontal cutting operation of the plate 3 can be held in the prohibited state without starting.

  As described above, in the floor slab dismantling work site, 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 site conditions and conditions.

  Then, the drive of the wire saw 23 is stopped, and the fixed pulley 61 is removed from the attachment members on both sides of the bridge girders 2A and 2B, so that the wire saw 23 is driven again to drive the first wire saw cutting device 21 and the first wire saw cutting device 21. Both the two-wire saw cutting device 22 can cut the bridge girders 2A and 2B and the concrete floor slab 3 in the horizontal direction.

(Embodiment 2)
FIG. 13 shows a 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, 64 are arranged to prohibit the vertical cutting operation along the planned cutting surface C2 of the concrete floor slab 3 by driving the saw 23.

That is, as shown in the figure, in the first wire saw cutting device 21, a vertical cutting along the planned cutting surface C2 is provided in the vicinity of the position before the cutting start portion in the vertical direction along the planned cutting surface C2 of the concrete floor slab 3. A rotatable fixed pulley 62, which prohibits the operation, is fixed to the outside of the concrete floor slab 3 and the wall balustrade 4 by a mounting member (not shown) and is arranged vertically.
Thus, the wire wound around the first driven pulley 240 and the second driven pulley 241 is wound around the pair of upper and lower fixed pulleys 62 arranged on the outer side of the concrete floor slab 3 and the wall balustrade 4 in the vicinity of the front position of the cutting start portion. Wrap each of the saws 23.

Also, regarding 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 vertical cutting start portion along the planned cutting surface C2 of the concrete floor slab 3. The rotatable fixed pulley 63 is fixed to the inner portion of the bridge girder 2A by a mounting member (not shown) and arranged vertically.
Further, a rotatable fixed pulley 64 is fixed to the inner side of the bridge girder 2B by a mounting member (not shown) and arranged vertically.
In this way, the wire saw 23 wound around the fixed pulley 221 and the eighth driven pulley 247 is respectively wound around the three fixed pulleys 63 and 64 arranged on both sides near the position before the cutting start portion of the concrete floor slab 3. Wrap around.

  In this way, by disposing the fixed pulleys 62, 63, 64, the first wire saw cutting device 21 and the second wire saw cutting device 22 are driven by the wire saw 23, so that the bridge girders 2A, 2B and the concrete floor slab 3 The cutting is performed in the direction along the joint boundary surface C1, that is, only in the horizontal direction, and the cutting in the vertical direction along the width direction and the thickness direction of the concrete floor slab 3 is not started, but is kept in the prohibited state.

After that, the driving of the wire saw 23 is stopped, the fixed pulleys 62 are removed from the mounting members on the outside of the concrete floor slab 3 and the wall balustrade 4, and the fixed pulleys 63 and 64 are attached to both insides of the bridge girders 2A and 2B. Remove from each mounting member.
As a result, as shown in FIG. 7, both the first wire saw cutting device 21 and the second wire saw cutting device 22 enable vertical cutting along the planned cutting plane C2 of the concrete floor slab 3, respectively.

  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 plane C2 of the concrete floor slab 3, respectively.

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, of the vertical cutting start portion along the planned cutting surface C2 of the concrete floor slab 3. In the vicinity, fixed pulleys 62, 63, 64 for prohibiting the cutting operation in the vertical direction are arranged on the outer side of the concrete floor slab 3 and the wall balustrade 4 and both inner sides of the bridge girders 2A, 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 horizontal direction of the bridge girders 2A and 2B and the concrete floor slab 3, respectively. The cutting operation of the plate 3 and the wall balustrade 4 in the vertical direction does not start, but can be kept in the prohibited state.

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

  Then, by stopping the driving of the wire saw 23 and removing the fixed pulleys 62, 63, 64 from the mounting members on the outer side of the concrete floor slab 3 and the wall balustrade 4 and both inner side portions 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.

(Modification 1)
FIG. 14 shows a 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 240 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.
In addition, the sixth driven roller 245 is removed from the first wire saw cutting device 21 to the second driven wire saw cutting device 22, and the wire saw 23 is attached to the fixed pulley 221 from the second drive roller 210B through 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. The floor slab cutting device 20 may be configured to simultaneously cut the concrete floor slab 3 only in the horizontal direction.

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

In this way, the wire saw 23 is extended to the cutting start position on the upper surface of the third bridge girder 2C, so that only the horizontal directions of the three bridge girders 2A, 2B, 2C and the concrete floor slab 3 are simultaneously cut. be able to.
Therefore, the work can be made more efficient by cutting it widely and largely.

(Modification 3)
FIG. 16 shows a floor slab cutting device 20 of Modification Example 3, in which the second driven pulley 241, the third driven pulley 242, the fourth driven pulley 243, the fifth driven pulley 244, and the second wire saw cutting device of FIG. 22 (driving pulley 220, fixed pulley 221, seventh driven pulley 246, eighth driven pulley 247, ninth driven pulley 248) is removed, and the wire saw 23 from the second driving roller 210B to the inside of the tenth driven roller 249. Is wrapped around.
A fixed pulley 67 similar to the sixth driven pulley 245 on the right side is fixed to the left side of the first bridge girder 2A by a mounting member (not shown).
Furthermore, the wire saw 23 is extended from the sixth driven pulley 245 and the tenth driven pulley 249 to the cutting start position on the side of the planned cutting plane 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 balustrade 4. The floor slab cutting device 20 may be configured to simultaneously cut the two.

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

(Modification 4)
FIG. 17 shows a floor slab cutting device 20 of modification 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 fixed pulley 68 is arranged above the ninth driven pulley 248 while being fixed by a mounting member (not shown).
Then, the wire saw 23 wound around the ninth driven pulley 248 and the fixed pulley 68, respectively, is installed on the right side from the ninth driven pulley 248 of the concrete floor slab 3 on the right side of the planned cutting plane C2 and on the wall balustrade installed on the right side. 4 is extended to the cutting start position on the outer side of No. 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 floor slab 3 are not cut in the horizontal direction, and the concrete floor slab 3 and The 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 slab 3 and the left and right wall balustrades 4 only in the vertical direction can be made long, and there is an advantage that a large and wide concrete slab 3 can be cut.
In this way, the work is made more efficient by cutting it widely and largely.

  As described above, using the floor slab cutting device 20 of the modified example 4 and the floor slab cutting device 20 of the modified example 1 described above, the step of simultaneously cutting only the vertical direction of the concrete floor slab 3 and the wall balustrade 4 is preceded. The step of simultaneously cutting only the horizontal direction of the bridge girders 2A and 2B and the concrete floor slab 3 respectively can be performed separately, and the two girders can be separately performed.

(Mobile factory)
18 and 19 show the structure of a 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 type, soundproof and dustproof type, and has a bellows type upper protection equipment 71 which can freely expand and contract along the longitudinal direction of the concrete floor slab 3 and its bellows type upper protection equipment 71. Equipped with a tire type self-propelled equipment 72 for moving the concrete along 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 protection equipment 71 covers both sides of the upper and left wall balustrades 4 including the completely anhydrous first wire saw cutting device 21 and the second wire saw cutting device 22 on the concrete slab 3.

  With such a mobile factory 70, for example, in the case of a one-lane bridge with a narrow road vehicle, a bellows type upper protection equipment 71 incorporating a dust collector 73, a lighting equipment 74 and a ventilation device is completely covered, For example, it becomes possible to cut and remove the whole cross section with a width of 2 m, it can be carried out by a trailer, etc., and it is also possible to handle night shift work with two shifts.

(Embodiment 3)
20 and 21 show the floor slab cutting device 20 of the third embodiment. As illustrated, a third wire saw cutting device 81 and a fourth wire saw cutting device 91 are arranged below the concrete floor slab 3. Thus, the wire saw 23 has one end fixed by the swinging fixture 231 and the other end fixed by the fixture 232.

That is, in the third wire saw cutting device 81, the housing 82, the drive pulley 83, and the drive device 83a are arranged below the concrete floor slab 3 between the first bridge girder 2A and the second bridge girder 2B. The wire saw 23 whose one end is fixed by the swinging fixture 231 is wound around the drive pulley 83.
The wire saw 23 is 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 in order, and further, the driven pulleys arranged on both sides of the right bridge girder 2B. The pulleys 87 and 88 are wound around one after another.

Further, in the fourth wire saw cutting device 91, the 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 wound around the drive pulley 93. The wire saw 23 thus wound 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 which are 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 by the swing fixing tool 231, and the other end is fixed to the fixing tool 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 balustrade 4 with the wire saw 23, the wire saw 23 comes into contact with the stopper roller 233, as indicated by a phantom 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 swing fixing tool 231, and the other end is fixed. Also in the floor slab cutting device 20 using the wire saw 23 in which the fixing tool 232 is fixed, the fixed pulley 61 or the fixed pulleys 62, 63, 64 for cutting prohibition can be arranged as in the first or second embodiment described above. Is.

(Modification 5)
FIG. 22 shows a floor slab cutting device 20 of modification 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 swinging fixture 231 and the fixture 232 are also removed.
Then, two driven pulleys 89 and 90 for guiding the endless wire saw 23 are newly arranged under the concrete floor slab 3.

That is, the endless wire saw 23 formed only by 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 as illustrated. It is wound around a new driven pulley 89.
In addition, between the left and right driven pulleys 88 and 89, an endless wire saw 23 that is 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 middle portion between them. A new driven pulley 90 arranged below the floor slab 3 is guided from below.

Thus, only the third wire saw cutting device 81 arranged under the concrete floor slab 3 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 road upper surface. By using the endless wire saw 23 according to the above, it is possible to simultaneously cut only the horizontal direction of the bridge girders 2A and 2B and the concrete floor slab 3, respectively.
Therefore, the third wire saw cutting device 81 is arranged below the concrete floor slab 3 in the daytime without passing through the road to regulate the vehicle so that the bridge girders 2A and 2B and the concrete floor slab 3 are cut in the horizontal direction. Can be done only, and the construction period can be shortened.

In addition, as described above, in order to arrange the third wire saw cutting device 81 under the concrete floor slab 3 in a state in which the vehicle is allowed to pass during the daytime without road regulation, the bridge girder of the concrete floor slab 3 is arranged. Small diameter holes (core line cut portions 3b and 3d) for passing the wire saw 23 are formed on 2A and 2B, but the core line cut portions 3b and 3d are cured so as not to hinder the vehicle traveling. .
Further, the vertical slab cutting of the concrete floor slab 3 and the left and right wall balustrades 4 is performed by traffic control at night by using the floor slab cutting device of the modified example 3 or 4 described above.

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

(Other modifications)
Although the floor slab cutting device having the guide roller is used in the above-described embodiment and modification, the guide roller may be omitted.

1 Bridge 2 Bridge Girder 2A 1st Bridge Girder 2B 2nd Bridge Girder 2C 3rd Bridge Girder 2a Gibel 3 Concrete Floor Slab 3a Block 4 Wall Railing 10 Movable Stage 10S Working Space 11 Stage Main Body 11d Opening 12 Leg 13 Guard 13a Rotating Member 15 Lower protector 20 Floor slab cutting device 21 First wire saw cutting device 210 Drive pulley 211 Fixed pulley 212 Moving pulley 22 Second wire saw cutting device 220 Drive pulley 221 Fixed pulley 23 Wire saw 24 Driven pulley 240 First driven pulley 241 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 plate lifting Means 40 Dust collecting means 5 0 power generation 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 dust collector 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 driving pulley 94 driven pulley 95 driven pulley 96 fixed pulley 97 Moving pulley 98 Fixed pulley C1 Joining boundary surface C2 Planned cutting surface

Claims (8)

A wire saw, which is laid on the bridge girder and continuously extends in the direction along the joint boundary surface between the concrete floor slab that constitutes the road surface of the bridge and the bridge girder and in the width direction and the thickness direction of the concrete floor slab, and the wire saw In a floor slab cutting device including a plurality of pulleys for guiding and driving the traveling direction along the extension route,
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, while guiding the wire saw in the traveling direction, the joining of the bridge girder and the concrete floor slab by driving the wire saw. A floor slab cutting device, in which a fixed pulley that prohibits a cutting operation along a boundary surface is arranged.   The floor slab cutting device according to claim 1, wherein the fixed pulleys are arranged on both sides of the bridge girder, respectively. A floor slab cutting method using the floor slab cutting apparatus according to claim 1,
In the vicinity of the cutting start portion in the direction along the joint boundary surface of the bridge girder and the concrete floor slab, a fixed pulley for guiding the wire saw in the traveling direction is arranged,
A floor slab cutting method, which prohibits a cutting operation in a direction along the joint boundary surface between the bridge girder and the concrete floor slab by driving the wire saw. After cutting in the width direction and the thickness direction of the concrete floor slab by driving the wire saw,
Remove the fixed pulley,
The floor slab cutting method according to claim 3, wherein the wire saw is driven to cut in a direction along the joint boundary surface between the bridge girder and the concrete floor slab. A wire saw laid on the bridge girder and continuously extending in the width direction and the thickness direction of the concrete slab and the direction along the joint boundary surface between the concrete slab and the bridge girder constituting the road surface of the bridge. In a floor slab cutting device including a plurality of pulleys for guiding and driving the traveling direction along the extension route,
In the vicinity of the cutting start portion in the direction along the width direction and the thickness direction of the concrete floor slab, while guiding the wire saw in the traveling direction, along the width direction and the thickness direction of the concrete floor slab by driving the wire saw. A floor slab cutting device, in which a fixed pulley that prohibits a cutting operation in a predetermined direction is arranged.   The floor slab cutting apparatus according to claim 5, wherein the fixed pulley is arranged at least at one end of a planned cutting surface in the width direction and the thickness direction of the concrete floor slab. A floor slab cutting method using the floor slab cutting device according to claim 5,
In the vicinity of the cutting start part in the direction along the width direction and the thickness direction of the concrete floor slab, a fixed pulley for guiding the wire saw in the traveling direction is arranged,
A floor slab cutting method, which prohibits a cutting operation in a width direction and a thickness direction of the concrete floor slab by driving the wire saw. After cutting the joint boundary surface between the bridge girder and the concrete floor slab by driving the wire saw,
Remove the fixed pulley,
The floor slab cutting method according to claim 7, wherein a direction along the width direction and the thickness direction of the concrete floor slab is cut by driving the wire saw.

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