JP2020012275A - Floor slab removal method and rail fixture - Google Patents

Abstract

To provide a floor slab removal method which allows a floor slab to be removed in a short time, and a rail fixture used for the same.SOLUTION: A floor slab removal method includes a first step and a second step. The first step includes: cutting and removing parts of a floor slab other than those on a main girder using a first cutting device capable of cutting concrete and metal. The second step includes: attaching a rail to the floor slab on the main girder via a rail fixture so that the longer direction is substantially parallel to a bridge axis direction; attaching to the rail a second cutting device capable of being attached to the rail, being moved along the rail, and cutting concrete and metal; horizontally cutting, by the second cutting device, the part of the floor slab on the main girder near the main girder, including the joints that join the floor slab and the main girder, while moving the second cutting device along the rail in the bridge axis direction; and removing the cut floor slab.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a method for removing an existing floor slab and a rail fixing tool used for the method.

  In recent years, construction work for replacing slabs of aging bridges has been increasing. When replacing a bridge slab, it is necessary to first remove the existing slab. When removing the slab of a steel girder bridge, it is necessary to remove the slab on the main girder and the joints such as the stud dowels that join the slab and the main girder, and make the upper flange of the main girder as flat as possible. There is. In addition, while the work of replacing the floor slab is being performed, traffic will be hindered. Therefore, it is required to immediately complete the work of removing the floor slab.

  Non-Patent Document 1 discloses a method of removing a floor slab of a steel girder bridge. In this method of removing the floor slab, first, the floor slab other than on the main girder is removed, and then the floor slab on the main girder is cut horizontally with a wall saw and removed. Next, the concrete remaining on the main girder is cut off with a chipper. Next, the base of the stud dowel remaining on the main girder is cut with a metal killer. Finally, the stud dowels that could not be completely cut by the metal killer are removed by grinding with a disc grinder.

  However, the method of removing the floor slab is an experimental stage, has not reached the stage where it can be applied to the site, and there is room for further shortening the construction period.

Shinsuke Akamatsu, Takumi Moro, Shigeru Matsumoto, "Study on Updating Existing RC Slabs Using High Performance Cast Iron Slabs", Proc. 49th Technical Research Presentation on Hanshin Expressway

  An object of the present invention is to provide a method of removing a floor slab which can be removed in a short period of time and a rail fixing tool used for the method.

  The method of removing the floor slab includes the first step of cutting and removing a portion of the floor slab other than on the main girder using the first cutting device capable of cutting concrete and metal, and the floor on the main girder. A rail is attached to the plate via a rail fixing device such that the longitudinal direction thereof is substantially parallel to the bridge axis direction, and then the rail can be attached to and movable along the rail, and concrete and metal can be removed. A second cutting device that can be cut is attached to the rail, and then, while moving the second cutting device along the rail in the bridge axis direction, the portion of the slab on the main girder near the main girder is moved by the second cutting device. A second step of cutting horizontally including a joint part for joining the floor slab and the main girder, and removing the cut floor slab.

  In addition, the method of removing the floor slab includes a third step of removing the floor slab remaining on the main girder with a shaving device, installing a gantry on the main girder, and moving the third cutting device on the gantry in the bridge axis direction. And a fourth step of horizontally cutting a portion near the main girder among the joints remaining on the main girder while moving the joint, and removing the cut joint. The third cutting device is capable of cutting metal, and includes a moving means for moving in the bridge axis direction.

  Further, the method of removing the floor slab may include a fifth step of removing the joint by cutting the joint remaining on the main girder with a cutting device. The cutting device includes a cutting device main body, a main shaft supported by the cutting device main body, and a tool. The main shaft supports the tool and rotates the tool about the rotation axis. The tool can cut metal and has a blade on a surface parallel to the rotation axis. Then, in the fifth step, the tool is rotated, and the side peripheral surface of the joint is cut along a plane parallel to the rotation axis of the tool.

  In the fifth step, a processing member may be installed on a portion of the main girder where the joint remains, instead of removing the joint by the cutting device. In this case, the processing member has a plate shape and is provided with a through-hole penetrating the plate surface, the plate surface is installed in contact with the main girder, and the joint is accommodated in the through-hole. Further, the thickness of the processing member is equal to or longer than the length of the joint portion accommodated in the through hole.

  The rail fixing device is capable of mounting a rail, a first side fixing portion attached to one side surface of the floor slab, and a first upper surface fixing portion connected to the first side fixing portion and mounted on the upper surface of the floor slab. And The first side fixing portion is fixed to one side surface of the floor slab by a fixing tool. The first upper surface fixing portion is fixed to the upper surface of the floor slab by a fixing tool.

  The rail fixing device further includes a second side fixing portion attached to the other side surface of the floor slab, and a second upper surface fixing portion connected to the second side fixing portion and mounted on the upper surface of the floor slab. It may be. The second side fixing portion is fixed to the other side surface of the floor slab by a fixing tool. Further, the second upper surface fixing portion is fixed to the upper surface of the floor slab by a fixing tool. Further, the first upper surface fixing portion and the second upper surface fixing portion are connected by a connecting tool.

  The gantry includes a pair of moving paths extending in parallel at an interval, and a connecting member connecting the pair of moving paths. The distance between the pair of moving paths is longer than the width of the main girder.

  According to the method of removing the floor slab, the floor slab can be removed in a short period of time. Further, according to the rail fixing device, the rail and the second cutting device are securely supported by the floor slab, and the floor slab on the main girder can be safely cut.

It is a top view showing a steel girder bridge. FIG. 2 is a sectional view taken along line II-II of FIG. 1. It is a flowchart which shows the procedure of the floor slab removal method of 1st embodiment. It is sectional drawing which shows a mode that a floor slab other than a main girder is removed. It is a top view showing signs that a floor slab on a main girder is cut by the 2nd cutting device. FIG. 6 is a sectional view taken along line VI-VI of FIG. 5. It is a figure which shows a 1st side fixing part, (A) is a front view and (B) is a side view. It is a figure which shows a 1st upper surface fixing | fixed part, (A) is a front view, (B) is a right view, (C) is a top view. It is a top view showing signs that a floor slab on a main girder is cut by the 2nd cutting device. It is XX sectional drawing of FIG. It is a figure which shows a 2nd side surface fixed part, (A) is a front view and (B) is a side view. It is a figure which shows the 1st upper surface fixing part of another form, and a 2nd upper surface fixing part, (A) is a front view, (B) is a right side view, (C) is a top view, (D) is a left side view. FIG. 4 is a partial cross-sectional view showing how a floor slab on a main girder is cut by a cutting device. It is a top view which shows a mode that the joining part on a main girder is cut | disconnected by a 3rd cutting device. FIG. 15 is a sectional view taken along line XV-XV in FIG. 14. FIG. 15 is a sectional view taken along line XVI-XVI in FIG. 14. It is a front view which shows a mode that the joining part on a main girder is cut with a cutting device. It is a side view which shows a mode that a joining part on a main girder is cut with a cutting device. It is a flowchart which shows each process of the removal method of the floor slab of 2nd embodiment. It is a top view showing the state where the processing member of the first mode was installed in the main girder. FIG. 21 is a sectional view taken along line XXI-XXI of FIG. 20. It is a top view showing the state where the processing member of a 2nd mode was installed in the main girder. FIG. 23 is a sectional view taken along line XXIII-XXIII in FIG. 22. It is a top view showing the state where the processing member of a 3rd mode was installed in the main girder.

A method of removing a floor slab according to an embodiment of the present invention will be described. The removal method of the floor slab of the embodiment is applied to the floor slab of the steel girder bridge.
In the following description, a direction perpendicular to the bridge axis direction is referred to as a width direction or a lateral direction, and a direction perpendicular to the bridge axis direction and the width direction is referred to as a vertical direction. The bridge axis direction may be referred to as the front-back direction.

  1 and 2 show a steel girder bridge to which the method of removing a floor slab is applied. The steel girder bridge mainly includes a main girder 10, a floor slab 20, and a joint 30.

  The main girder 10 is formed of an I-shaped member extending in the bridge axis direction, and includes an upper flange 12, a lower flange 14, and a web 16 connecting the upper flange 12 and the lower flange 14. A plurality of main girders 10 are provided in the width direction, and are each bridged on an abutment or a pier.

  The floor slab 20 is made of reinforced concrete, and is installed on the upper flange 12 of the main girder 10 provided in a plurality in the width direction. The portion of the floor slab 20 that is installed on the upper flange 12 of the main girder 10 is a haunch portion 22 where the thickness of the slab is increased.

  The joining portion 30 is for joining the main girder 10 and the floor slab 20, and here, it is assumed that a stud dowel is used. The stud dowel is made of metal, and has a base connected to the upper flange 12 and extending upward from the base.

  As shown in FIG. 3, the floor slab removing method of the first embodiment includes a first step S1, a second step S2, a third step S3, a fourth step S4, and a fifth step S4. Step S5 is provided.

  In the first step S1, a portion other than on the main girder 10 of the floor slab 20 is cut and removed using the first cutting device 40 capable of cutting concrete and metal.

  Specifically, using a first cutting device 40 that cuts the floor slab 20 vertically, as shown by a dashed line in FIGS. The slab 20 is cut in the bridge axis direction at a slightly distant position, and the slab 20 is cut in the width direction at appropriate intervals in the bridge axis direction. Then, as shown in FIG. 4, the floor slab blocks 24 separated from the floor slab 20 are sequentially removed. As the first cutting device 40, a concrete cutter or the like capable of cutting concrete and metal can be used. A crane (not shown) can be used to remove the separated floor slab block 24. When a crane is used, before the floor slab block 24 is separated from the floor slab 20, the crane is connected to a portion of the floor slab 20 that can be the floor slab block 24 so that the floor slab block 24 can Once separated, remove with a crane.

  When the first step S1 is completed, the floor slab 20 remains only on the main girder 10.

  In the second step S2, as shown in FIG. 5 and FIG. 6, the rail 50 is placed on the floor slab 20 on the main girder 10 via the rail fixing member 60 so that the longitudinal direction thereof is substantially parallel to the bridge axis direction. Attach to Next, a second cutting device 120 that is attachable to the rail 50 and movable along the rail 50 and capable of cutting concrete and metal is attached to the rail 50. Next, while moving the second cutting device 120 in the bridge axis direction along the rail 50, the portion of the floor slab 20 on the main girder 10 near the main girder 10 including the joint 30 is moved by the second cutting device 120. It cuts horizontally and removes the cut floor slab 20.

  The rail 50 includes a rail main body 52 extending in one direction, and a mounting portion 54 for mounting the rail main body 52 to the rail fixing member 60. The attachment portion 54 is provided with a through hole (not shown) for attaching the rail 50 to the rail fixture 60. The rail 50 is attached to the rail fixture 60 by passing a bolt 56 through the through hole and fastening the bolt 56 to a fastening hole 73 (rail fixing portion) of the rail fixture 60 described later.

  As shown in FIGS. 5 and 6, the rail fixing tool 60 can be attached to the rail 50, and has a first side fixing part 70 attached to one side of the floor slab 20, and a first side fixing part 70. And a first upper surface fixing portion 80 connected to the upper surface of the floor slab 20. The first side fixing portion 70 is fixed to one side surface of the floor slab 20 by a fixing tool 77. In addition, the first upper surface fixing portion 80 is fixed to the upper surface of the floor slab 20 by the fixing member 87. The rail fixture 60 is formed of, for example, metal.

As shown in FIG. 7, the first side surface fixing portion 70 has a plate shape, and the plate surface is substantially rectangular. The height of the first side surface fixing portion 70 is higher than the height of the side surface (the surface orthogonal to the width direction) of the floor slab 20 on the main girder 10. In the lower part of the first side fixing part 70, a through hole 74 penetrating the plate surface is provided for fixing the first side fixing part 70 to the side surface of the floor slab 20 using the fixing tool 77. As the fixture 77, for example, an anchor bolt can be used.
Further, in the center of the plate surface of the first side surface fixing portion 70, a fastening hole 73 (in which the bolt 56 is fastened) for fixing the mounting portion 54 of the rail 50 to the first side surface fixing portion 70 using the bolt 56. Rail fixing portion).
In addition, a through hole 75 that penetrates the plate surface is provided at an upper portion of the first side surface fixing portion 70 in order to connect the first side surface fixing portion 70 and the first upper surface fixing portion 80 using the first connecting member 88. Provided. As the first connecting member 88, a bolt and a nut fastened to the bolt can be used.

  The first side surface fixing portion 70 aligns its plate surface with a side surface (a surface orthogonal to the width direction) of the floor slab 20 on the upper side of the haunch portion 22, and attaches an anchor bolt (a fixing tool 77) via a through hole 74. It is fixed to the floor slab 20 by driving into the lower part of the floor slab 20. When the first side surface fixing portion 70 is fixed to the side surface of the floor slab 20, its upper end is located at a position higher than the upper surface of the floor slab 20 and protrudes upward from the upper surface of the floor slab 20.

  As shown in FIG. 8, the first upper surface fixing portion 80 extends in one direction, and has a substantially L-shaped cross section in that direction. The first upper surface fixing part 80 includes a bottom part 81 and a first side part 82 connected to the bottom part 81. The bottom portion 81 has a plate shape, and the plate surface is substantially rectangular. The bottom portion 81 is provided with a through hole 84 that penetrates the plate surface in order to fix the first upper surface fixing portion 80 to the upper surface of the floor slab 20 using the fixing device 87. The first side portion 82 is plate-shaped, the plate surface is substantially rectangular, and the lower end is formed on one side end of the bottom portion 81 so that the plate surface is perpendicular to the plate surface of the bottom portion 81. Connected. The first side portion 82 is provided with a through hole 85 that penetrates the plate surface in order to fix the first upper surface fixing portion 80 to the first side surface fixing portion 70 using the first connecting member 88.

  As shown in FIGS. 5 and 6, the first upper surface fixing portion 80 is configured such that a side surface (plate surface) of the first side portion 82 on the first side surface fixing portion 70 side is a side surface (plate surface) of the first side surface fixing portion 70. In addition, the bottom 81 is aligned with the portion protruding above the upper surface of the floor slab 20 and the bottom surface of the bottom portion 81 is aligned with the upper portion of the floor slab 20. The nut (first connecting member 88) is fastened by passing a bolt (first connecting member 88) into the through hole 75 of the fixing portion 70, whereby the first side fixing portion 70 is connected. Further, the first upper surface fixing portion 80 is fixed to the floor slab 20 by driving an anchor bolt (fixing tool 87) into the upper surface of the floor slab 20 through the through hole 84 of the bottom portion 81.

  The first side surface fixing portion 70 and the first upper surface fixing portion 80 may be connected by welding or may be formed integrally in advance.

  The rail fixing device 60 is configured to fix the first side surface fixing portion 70 and the first upper surface fixing portion 80 to the first side surface fixing portion 70 in advance before attaching the first side surface fixing portion 70 and the first upper surface fixing portion 80 to the floor slab 20 individually. It is preferable to connect the portion 80 to the floor slab 20 in a connected state by using the first connecting tool 88. If the first side fixing portion 70 and the first upper fixing portion 80 are connected in advance, the rail fixing portion can be more easily and efficiently attached to the floor slab 20.

  The rail fixing device 60 may have other forms as described below. As shown in FIGS. 9 and 10, the rail fixing device 60 of another embodiment is capable of mounting the rail 50, and includes a first side fixing portion 70 mounted on one side of the floor slab 20, and a first side fixing portion 70. A first upper surface fixing portion 100 connected to the fixing portion 70 and attached to the upper surface of the floor slab 20, a second side surface fixing portion 90 attached to the other side surface of the floor slab 20, and a second side fixing portion 90 , A second upper surface fixing portion 110 attached to the upper surface of the floor slab 20. Then, the first side fixing portion 70 is fixed to one side surface of the floor slab 20 by the fixing member 77. Further, the second side surface fixing portion 90 is fixed to the other side surface of the floor slab 20 by the fixing member 97. Further, the first upper surface fixing portion 100 and the second upper surface fixing portion 110 are connected by the second connecting member 109. The rail fixture 60 is formed of, for example, metal.

  In the configuration of the rail fixing tool 60 in another aspect, the first side fixing part 70 is the same as the first side fixing part 70 shown in FIG. The first side surface fixing portion 70 has its plate surface aligned with one side surface of the floor slab 20 that is above the haunch portion 22 and is orthogonal to the width direction, and attaches the fixing device 77 to the floor slab 20 through the through hole 74. It is fixed to the floor slab 20 by being driven into the lower part.

  The second side fixing part 90 is basically the same as the first side fixing part 70 described above, except that the second side fixing part 90 does not include the fastening hole 73 (rail fixing part), as shown in FIG. In the lower part of the second side fixing part 90, a through hole 94 penetrating the plate surface is provided for fixing the second side fixing part 90 to the side surface of the floor slab 20 using the fixing tool 97. In addition, a through-hole 95 that penetrates the plate surface is provided at an upper portion of the second side surface fixing portion 90 in order to connect the second side surface fixing portion 90 and the second upper surface fixing portion 110 using the first connecting tool 118. Provided. The second side surface fixing portion 90 aligns the plate surface with the other side surface of the floor slab 20 that is above the haunch portion 22 and is orthogonal to the width direction, and attaches the fixing tool 97 to the floor slab 20 through the through hole 94. It is fixed to the floor slab 20 by being driven into the lower part. As the fixing members 77 and 97, for example, anchor bolts can be used. In a state where the first side fixing portion 70 and the second side fixing portion 90 are fixed to the side surface of the floor slab 20, the upper ends thereof are located higher than the upper surface of the floor slab 20, and project upward from the upper surface of the floor slab 20. Will be done.

  As shown in FIG. 12, the first upper surface fixing portion 100 and the second upper surface fixing portion 110 each extend in one direction, and have a substantially C-shaped cross section in that direction. The first upper surface fixing portion 100 and the second upper surface fixing portion 110 include bottom portions 101 and 111, respectively, and first side portions 102 and 112 and second side portions 103 and 113 connected to the bottom portions 101 and 111, respectively.

  The bottom portions 101 and 111 have a plate shape, and the plate surface is substantially rectangular. The first side portions 102 and 112 have a plate shape and a substantially rectangular plate surface, and the lower end thereof is formed on one of the bottom portions 101 and 111 so that the plate surface is perpendicular to the plate surfaces of the bottom portions 101 and 111. Is connected to the side end of. In addition, the second side portions 103 and 113 are each in the form of a plate and have a substantially rectangular plate surface, and the lower end thereof has a bottom 101, 111 so that the plate is perpendicular to the plate of the bottom 101, 111. 111 is connected to the other side end.

  In the first side portion 102 of the first upper surface fixing portion 100, a through-hole penetrating a plate surface for connecting the first upper surface fixing portion 100 and the first side surface fixing portion 70 using the first connecting member 108. 104 are provided. In addition, the first side portion 112 of the second upper surface fixing portion 110 penetrates the plate surface in order to connect the second upper surface fixing portion 110 and the second side surface fixing portion 90 using the first connector 118. A through hole 114 is provided. As the first connecting members 108 and 118, a bolt and a nut fastened to the bolt can be used. In addition, the first upper surface fixing portion 100 and the second upper surface fixing portion 110 are connected to the second side portions 103 and 113 of the first upper surface fixing portion 100 and the second upper surface fixing portion 110 using the second connecting member 109. For this purpose, through holes 105 and 115 penetrating the plate surface are provided. As the second connector 109, a bolt and a nut fastened to the bolt can be used.

The first upper surface fixing portion 100 is configured such that the side surface (plate surface) of the first side portion 102 on the first side surface fixing portion 70 side is located above the upper surface of the floor slab 20 in the side surface (plate surface) of the first side surface fixing portion 70. In accordance with the protruding portion, a bolt (first connecting member 108) is passed through the through hole 104 of the first side portion 102 of the first upper surface fixing portion 100 and the through hole 75 of the first side surface fixing portion 70, and a nut (first connecting member 108) is inserted. ) Is connected to the first side surface fixing portion 70.
The second upper surface fixing portion 110 is arranged such that the side surface (plate surface) of the first side portion 112 on the second side surface fixing portion 90 side is higher than the upper surface of the floor slab 20 of the side surface (plate surface) of the second side surface fixing portion 90. The bolt (first connecting member 118) is passed through the through hole 114 of the first side portion 112 of the second upper surface fixing portion 110 and the through hole 95 of the second side surface fixing portion 90 in accordance with the portion protruding to the nut. 118) is connected to the second side surface fixing portion 90.
The first upper surface fixing portion 100 and the second upper surface fixing portion 110 pass through the through holes 105 and 115 of the second side portions 103 and 113, respectively, by passing bolts (second connecting members 109) and nuts (second connecting members 109). Are connected by concluding.

  In addition, you may fix the 1st upper surface fixing part 100 and the 2nd upper surface fixing part 110 to the upper surface of the floor slab 20 using fixing tools, such as an anchor bolt. In this case, through holes are provided in the bottom portions 101 and 111 of the first upper surface fixing portion 100 and the second upper surface fixing portion 110 to penetrate the plate surface, and an anchor bolt is driven into the upper surface of the floor slab 20 from the through holes. The one upper surface fixing portion 100 and the second upper surface fixing portion 110 can be fixed to the floor slab 20.

  The first side surface fixing portion 70 and the first upper surface fixing portion 100 may be connected by welding or may be integrally formed in advance. Further, the second side surface fixing portion 90 and the second upper surface fixing portion 110 may be connected by welding or may be formed integrally in advance.

  Before the rail fixing member 60 is attached to the floor slab 20, the first side fixing portion 70 and the first upper fixing portion 100 are connected by the first connecting member 108, and the second side fixing portion 90 and the second upper fixing portion 110 are connected. Are connected by the first connecting member 118 and the first upper fixing portion 100 and the second upper fixing portion 110 are temporarily connected by the second connecting member 109, so that the rail fixing portion can be more easily and efficiently connected to the floor slab 20. Can be attached to

  The second cutting device 120 is a device capable of cutting concrete and reinforcing steel, and a wall saw is used in the present embodiment. As shown in FIGS. 5 and 6, the second cutting device 120 is attached to the rail 50 and is movable along the rail 50, and the second cutting device main body 122 is attached to the second cutting device main body 122. And a disk-shaped cutter 124 that is driven to rotate by the second cutting device main body 122. The cutter 124 is provided with a blade capable of cutting concrete and metal on the outer peripheral edge of the disk, and rotates around the center of the disk. When the second cutting device 120 is attached to the rail 50, the rotation axis of the cutter 124 is parallel to the vertical direction, and the board surface is orthogonal to the vertical direction. Note that the second cutting device 120 may include a movement driving unit for driving the movement of the second cutting device 120.

  Based on the above configurations, the second step S2 will be specifically described with reference to FIGS. First, before attaching the rail fixing member 60 to the floor slab 20 on the main girder 10, the first side fixing portion 70 and the first upper surface fixing portion 80 of the rail fixing member 60 are connected by a first connecting member 88 in advance. Is integrated. When using the rail fixing tool 60 of another aspect, the first side fixing part 70 and the first upper fixing part 100 are connected by the first connecting part 108, and the second side fixing part 90 and the second upper fixing part 110 are connected. Are connected by a first connecting member 118, and the first upper surface fixing portion 100 and the second upper surface fixing portion 110 are temporarily connected by a second connecting member 109, so that the components of the rail fixing member 60 are integrated.

  Next, the integrated rail fixing device 60 is installed on the upper surface and the side surface of the floor slab 20, and is fixed to the floor slab 20 using the fixing devices 77, 87, and 97. Next, the rail 50 is attached to the first side fixing portion 70 so as to be parallel to the bridge axis direction. The rail 50 is attached to the rail fixing member 60 by passing a bolt 56 through a through hole (not shown) of the attaching portion 54 and fastening the bolt 56 to a fastening hole 73 of the first side fixing portion 70. Next, if the second cutting device 120 is attached to the rail 50, the preparation for cutting the floor slab 20 is completed. Then, while moving the second cutting device 120 in the bridge axis direction along the rail 50, the portion of the floor slab 20 on the main girder 10 near the main girder 10, such as the haunch portion 22, including the joint portion 30 is horizontally moved. Cut into pieces. When the cutting of the floor slab 20 on the main girder 10 is completed, the rail 50 and the rail fixture 60 are removed from the cut floor slab block (not shown), and the cut floor slab block is removed. The floor slab 20 on the main girder 10 is cut vertically in the width direction in the first step S1. A crane (not shown) can be used to remove the slab block. When using a crane, before cutting the floor slab 20, a crane is previously connected to the portion where the floor slab 20 is cut, and when the floor slab block is separated from the floor slab 20, it is removed with the crane.

  When the second step S2 is completed, the floor slab 20 and the joint portion 30 that have not been completely cut by the second cutting device 120 remain on the main girder 10. In the second step, the portion of the floor slab 20 on the main girder 10 close to the main girder 10 is cut by the second cutting device 120, so that the part including the reinforcing bar of the floor slab 20 is removed and remains on the main girder 10. The floor slab 20 is composed only of concrete.

  In the third step S3, as shown in FIG. 13, the floor slab 20 of the floor slab 20 and the joining portion 30 remaining on the main girder 10 after the second step S2 is removed by using the cutting device 130. .

  As the cutting device 130, a concrete chipper or a concrete breaker can be used.

  When the third step is completed, only the joints 30 that have not been cut in the second step S2 remain on the main girder 10.

  In the fourth step S4, as shown in FIG. 14 and FIG. 15, the gantry 140 is installed on the main girder 10, and the third cutting device 150 is moved on the gantry 140 in the bridge axis direction. A portion of the remaining joint 30 near the main girder 10 is cut horizontally, and the cut joint 30 is removed. The third cutting device 150 is capable of cutting metal, and includes a moving unit 153 for moving on the gantry 140.

  As shown in FIGS. 14 and 16, the gantry 140 includes a pair of moving paths 142, 142, and a moving path connecting portion 144 that connects the pair of moving paths 142, 142.

  The moving path 142 serves as a path for the third cutting device 150, is made of metal, is formed of a plate-like member extending in one direction, and has a substantially rectangular plate surface. The pair of moving paths 142, 142 are arranged such that the plate surfaces are perpendicular to the up-down direction and the longitudinal directions are parallel to each other with an interval in the width direction. The interval is longer than the width of the main girder 10, in other words, the width of the upper flange 12 of the main girder 10.

  The moving path connecting portion 144 is for connecting the pair of moving paths 142 arranged at an interval, and is made of a metal and is a plate-like member extending in one direction. The moving path connecting portion 144 is connected to the front and rear portions of the upper surfaces of the pair of moving paths 142 with the plate surface perpendicular to the vertical direction and the longitudinal direction perpendicular to the longitudinal direction of the moving path 142. Is done.

  The moving path 142 and the moving path connecting portion 144 are provided with through holes 145 and 146 penetrating through their respective plate surfaces at a portion where the both overlap with each other in order to fix them with the third connecting member 148. As the third connecting member 148, a bolt and a nut fastened to the bolt can be used. The pair of moving paths 142, 142 and the moving path connecting part 144 are integrated by passing a bolt (third connecting tool 148) through the through hole and fastening a nut (third connecting tool 148).

  As shown in FIGS. 14 and 15, the third cutting device 150 includes a third cutting device main body 151, and a cutter 152 attached to the third cutting device main body 151 and driven to circulate.

  The third cutting device main body 151 has a portal shape when viewed from the front, and has wheels on its side as moving means 153 for moving the third cutting device 150.

  The moving means 153 is connected to a rotating shaft that rotates about the horizontal direction and rotates, so that the third cutting device 150 can move in the front-rear direction.

  The third cutting device main body 151 includes a pair of pulleys 154 and 154. The pair of pulleys 154 and 154 are rotatably supported on left and right legs of the gate, respectively, on a rotating shaft that rotates about the front-rear direction. At least one pulley 154 is driven to rotate by the third cutting device main body 151.

  The cutter 152 is belt-shaped and annular, and is stretched over a pair of pulleys 154 and 154. The cutter 152 is horizontally horizontal between the pair of pulleys 154 and 154. The length of this horizontal portion is longer than the length of the section where the joint 30 exists in the width direction. The cutter 152 has a blade capable of cutting metal at one end in the front-rear direction. The lower horizontal portion of the cutter 152 bridged between the pair of pulleys 154 and 154 is a portion for cutting the object to be cut, and cuts the object to be cut near its root. Located nearby.

  The third cutting device 150 cuts the cutting target horizontally by circulating the cutter 152 with the pulley 154 while moving in the bridge axis direction. At this time, the third cutting device 150 moves by moving the joint 30 between the legs of the third cutting device main body 151.

  Based on the above configurations, the fourth step S4 will be specifically described with reference to FIGS. First, the gantry 140 is installed on the upper flange 12 of the main girder 10. In the gantry 140, the longitudinal direction of the moving path 142 is substantially parallel to the bridge axis direction, the upper flange 12 of the main girder 10 is located between the pair of moving paths 142, 142, and the moving path connecting portion 144 is in the width direction. The main girder 10 is installed on the upper flange 12 in a state of being substantially parallel to the above. In addition, the gantry 140 is installed at a position where the moving path connecting portion 144 does not interfere with the joining portion 30 remaining on the upper flange 12 of the main girder 10. After the gantry 140 is installed on the upper flange 12 of the main girder 10, the gantry 140 is fixed to the main girder 10 using the fixing means 149. As the fixing means 149, for example, a vise can be used. The gantry 140 is fixed to the main girder 10 by fixing the moving path connecting portion 144 and the upper flange 12 with a vice.

  Next, the third cutting device 150 is installed on the pair of moving paths 142, 142 of the gantry 140 such that the front-rear direction is parallel to the bridge axis direction. Then, the third cutting device 150 is moved in the bridge axis direction while the cutter 152 is circulated, and the joint 30 remaining on the main girder 10 is cut horizontally. At this time, when there are a plurality of joints 30 in the width direction, the joints 30 in the width direction are cut at the same time by the third cutting device 150. When cutting the joints 30 outside the range where the gantry 140 is installed, the fixing of the gantry 140 by the fixing means 149 is released, the gantry 140 is shifted in the bridge axis direction, and all the joints 30 on the main girder 10 are removed. Repeat the above steps until cutting.

  When the fourth step S4 is completed, the joining portions 30 that cannot be completely cut in the fourth step S4 remain on the main girder 10.

  In the fifth step S5, as shown in FIGS. 17 and 18, the joint 30 remaining on the main girder 10 is cut by a cutting device 160 to remove the joint 30. 17 is a side view of the cutting device 160, and FIG. 18 is a front view of the cutting device 160.

  The cutting device 160 includes a cutting device main body 161, a main shaft 167 supported by the cutting device main body 161, and a tool 168 capable of cutting metal.

The cutting device main body 161 includes a moving unit 162 that moves in the front-rear direction and the lateral direction with respect to the cutting device main body 161. The moving unit 162 is provided with an elevating unit (not shown) for elevating the main shaft 167. The cutting device main body 161 includes an operation unit 163 for operating the movement of the moving unit 162 and the elevation of the main shaft 167.

  In addition, the cutting device main body 161 includes a pair of installation portions 164 for installation on the main girder 10. The installation portion 164 extends in the front-rear direction, and has a substantially L-shaped cross section in that direction. The installation part 164 includes a bottom part 165 and a side part 166 connected to the bottom part 165. The bottom 165 has a plate shape, and the plate surface is substantially rectangular. The side portion 166 is plate-shaped, the plate surface is substantially rectangular, and its lower end is connected to one side end of the bottom portion 165 so that the plate surface is perpendicular to the plate surface of the bottom portion 165. I have. The installation portion 164 is attached to the cutting device main body 161 by fixing the side portion 166 to the side surface of the cutting device main body 161 using a fixing tool such as a screw so that the bottom surface of the bottom portion 165 is substantially horizontal.

  The main shaft 167 supports the tool 168 and drives the tool 168 to rotate about a vertical axis as a rotation axis. The main shaft 167 is supported by the moving unit 162 so as to be able to move up and down.

  The tool 168 is capable of cutting metal, has a columnar shape, and has an upper portion attached to the main shaft 167. The tool 168 includes a cutting blade on a surface parallel to the rotation axis, that is, on a side peripheral surface. An end mill can be used as the tool 168.

  By operating the operation unit 163, the cutting device 160 can move the main shaft 167 and the tool 168 in the horizontal direction or move the tool 168 up and down.

  Based on the above configurations, the fifth step S5 will be specifically described with reference to FIGS. First, the cutting device 160 is set so that the front-rear direction of the cutting device 160 is substantially parallel to the width direction of the main girder 10 and the tool 168 is located on the side of the joint 30. At this time, the tip of the tool 168 may be in contact with the upper surface of the upper flange 12 or may be close to the upper surface of the upper flange 12 to such an extent that it does not contact. The cutting device 160 installed on the main girder 10 is fixed to the main girder 10 by sandwiching the installation portion 164 and the upper flange 12 of the main girder 10 by fixing means 149 such as a vise. When the cutting device 160 is fixed to the main girder 10, it is easy to cut the joint 30 and the cutting finish is improved, and the cutting can be performed efficiently.

  Next, by rotating the tool 168 of the cutting device 160 and operating the operating portion 163 to move the tool 168, one or a plurality of joints 30 in the width direction of the main girder 10 are individually cut and removed. I will do it. At this time, the joint portion 30 is cut by applying the side peripheral surface of the tool 168 to the side peripheral surface of the joint portion 30. For the joint 30 that cannot be cut within the range where the cutting device 160 is installed, the cutting device 160 is installed by moving the cutting device 160 to the opposite side of the width direction of the upper flange 12 or by moving the cutting device 160 in the bridge axis direction. Perform 30 cuts.

  When the fifth step S5 is completed, the joint 30 on the main girder 10 is removed, the upper surface of the upper flange 12 of the main girder 10 is flush, and the removal of the floor slab 20 is completed.

  The cutting device 160 may not include both or one of the moving unit 162 and the elevating unit. Further, the cutting device 160 may not include the installation portion 164. When the installation unit 164 is not provided, the cutting device 160 cuts the joint 30 without fixing to the main girder 10.

  According to the method of removing the floor slab of the first embodiment, the floor slab 20 can be removed in a short period of time.

  In addition, the method of removing the floor slab of the first embodiment can cut and remove most of the floor slab 20 remaining on the main girder 10 in a short time by providing the second step S2. When the rail 50 and the second cutting device 120 are to be mounted on the side surface of the floor slab 20 on the main girder 10 via the rail fixing tool 60 mounted only on the side surface of the rail 50, the thickness of the floor slab 20 is reduced to Since the thickness is relatively thin with respect to the two-cutting device 120, the space for driving the fixing device for fixing the rail fixing device 60 to the floor slab 20 and the mounting range of the mounting portion 54 of the rail 50 are narrow, and the floor on the main girder 10 is small. There is a problem that the plate 20 cannot reliably support the rail 50 and the second cutting device 120. However, in the second step S2, the rail fixture 60 is fixed to the upper surface and the side surface of the floor slab 20, so that the rail 50 and the second cutting device 120 can be reliably supported by the floor slab 20. Also, in the rail fixing device 60, as in the embodiment, the height of the first side fixing portion 70 is higher than the height of the side surface (the surface orthogonal to the width direction) of the floor slab 20 on the main girder 10, and By attaching the side fixing portion 70 to the floor slab 20 so as to protrude from the upper surface of the main girder 10, the range in which the mounting portion 54 of the rail 50 can be mounted can be secured widely in the vertical direction. Can be securely fixed to the first side fixing portion 70, and the rail 50 and the second cutting device 120 can be more reliably supported by the floor slab 20. In the second step S2, if the first upper surface fixing portion 80 and the first side surface fixing portion 70 are connected in advance by the first connecting member 88 before the rail fixing member 60 is installed on the floor slab 20, The rail fixture 60 can be easily and quickly attached to the floor slab 20.

  In addition, the method of removing the floor slab of the first embodiment includes the fourth step S4, so that the joint 30 remaining on the main girder 10 can be cut and removed in a short time. Further, in the fourth step S4, the movement and installation of the gantry 140 are easy, and when the cutting of the joint 30 in the area where the gantry 140 is installed is completed, the gantry 140 is moved in the bridge axis direction so that the main girder 10 can be moved. And the cutting of the joint 30 remaining on the main girder 10 by the third cutting device 150 can be repeated.

  In addition, since the floor slab removing method of the first embodiment includes the fifth step S5, the cutting portion 160 is used to cut and remove the joint 30 remaining on the main girder 10, so that the conventional method is used. As compared with the case where the joint 30 is polished and removed by a polishing device such as a grinder, the operation time can be greatly reduced, and the surface to be removed can be remarkably finished.

  Next, a method of removing the floor slab according to the second embodiment will be described. As shown in FIG. 19, the floor slab removing method according to the second embodiment includes a first step S1, a second step S2, a third step S3, a fourth step S4, and a fifth step S4. Step S5 is provided. Since the method of removing the floor slab of the second embodiment is different from the first embodiment only in the content of the fifth step S5, only the fifth step S5 will be described here.

In the fifth step S5, as shown in FIG. 20 to FIG. 24, processing members 170, 180, and 190 are installed on a portion of the main girder 10 where the joining portion 30 remains.
Each of the processing members 170, 180, and 190 has a metal plate shape, and has through holes 172, 182, and 192 penetrating the plate surface. The through holes 172, 182, and 192 are for accommodating the joint 30 in the holes, and are provided at positions where the joint 30 exists. The diameters of the through holes 172, 182, 192 are large enough to accommodate the joint 30 in the through holes 172, 182, 192. The thickness of the processing members 170, 180, and 190 is set so that the bonding portions 30 do not protrude from the through holes 172, 182, and 192 when the processing members 170, 180, and 190 are installed on the main girder 10. It is longer than the length of the part 30.

  The processing members 170, 180, and 190 are installed on the main girder 10 such that the plate surface is in contact with the upper flange 12 of the main girder 10, and the joint 30 is accommodated in the through holes 172, 182, and 192.

  The processing members 170, 180, and 190 are provided with a floor slab fixture (not shown) for mounting a new floor slab 20 on the main girder 10 on the upper surface thereof. Fixed to Therefore, the processing members 170, 180, and 190 may have through holes 174, 184, and 194 through which bolts are passed in advance. Further, the through holes 172, 182, and 192 of the processing members 170, 180, and 190 installed on the main girder 10 may be filled with a filler such as putty in order to refill the holes.

  Hereinafter, a plurality of embodiments of the processing members 170, 180, and 190 will be described. In the first embodiment of the processing member 170, as shown in FIGS. 20 and 21, the shape of the plate surface is rectangular, and can accommodate a plurality of joints 30 in the bridge axis direction. A plurality of through holes 172 that can accommodate the joint 30 are provided. In the first aspect of the processing member 170, a plurality of processing members 170 can be installed in the bridge axis direction, and in the bridge axis direction, a plurality of processing members 170 can be installed so as to accommodate all the joints 30 in the through-holes 172. May not be installed at the joint 30 in the section of.

  In the second embodiment of the processing member 180, as shown in FIGS. 22 and 23, the shape of the plate surface is rectangular, and includes a plurality of through holes 182 capable of accommodating a plurality of joints 30 in the bridge axis direction. . In the second aspect of the processing member 180, a plurality of processing members 180 can be installed in the bridge axis direction and the width direction. In the bridge axis direction and the width direction, a plurality of processing members 180 are installed so that all the joints 30 are accommodated in the through holes 182. Alternatively, it may not be installed at the joint 30 in some sections. In the second aspect of the processing member 180, from the viewpoint of installing a new member on the processing member 180, the processing member 180 is installed at the joining portion 30 arranged in the bridge axis direction at least at the outermost side in the width direction. Is preferred.

  In the third embodiment of the processing member 190, as shown in FIG. 24, the shape of the plate surface is rectangular and provided with a plurality of through holes 192 capable of accommodating all the joints 30 arranged in one width direction. The third aspect of the processing member 190 can be provided in a plurality in the bridge axis direction. In the bridge axis direction, a plurality of the processing members 190 may be provided so as to accommodate all the joints 30 in the through holes 192, or some of them may be provided. It may not be installed at the joint 30 of the section.

  Note that the processing members 170, 180, and 190 may be provided with one through-hole and can accommodate one joint 30.

  According to the floor slab removing method of the second embodiment, in the fifth step S5, the processing members 170, 180, and 190 are installed on the portion where the joint 30 remains, and the joint 30 is inserted into the through hole 172. , 182, and 192, the main girder 10 can be flattened and the joint 30 remaining on the main girder 10 does not need to be completely removed. The time required for removing the plate 20 can be greatly reduced.

  The method of removing the floor slab of the present invention and the rail fixing tool used for the method are not particularly limited to the above embodiment, and can be appropriately changed within the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Main girder 12 Upper flange 14 Lower flange 16 Web 20 Floor slab 22 Haunch part 24 Floor slab block 30 Joining part 40 First cutting device 50 Rail 52 Rail main body 54 Mounting part 56 Bolt 60 Rail fixture 70 First side fixing part 73 Fastening hole (rail fixing part)
74, 75 Through hole 77 Fixing device 80 First upper surface fixing portion 81 Bottom portion 82 First side portion 84, 85 Through hole 87 Fixing device 88 First connector 90 Second side fixing portion 94, 95 Through hole 97 Fixing device 100 First One upper surface fixing portion 101 Bottom portion 102 First side portion 103 Second side portion 104, 105 Through hole 108 First connecting member 109 Second connecting member (connecting member)
110 second upper surface fixing portion 111 bottom portion 112 first side portion 113 second side portion 114, 115 through hole 118 first connection tool 120 second cutting device 122 second cutting device main body 124 cutter 130 shaving device 140 gantry 142 moving path 144 Moving path connecting portions 145, 146 Through holes 148 Third connecting tool 149 Fixing means 150 Third cutting device 151 Third cutting device main body 152 Cutter 153 Moving means 154 Pulley 160 Cutting device 161 Cutting device main body 162 Moving portion 163 Operating portion 164 Installation part 165 Bottom part 166 Side part 167 Main shaft 168 Tool 170, 180, 190 Processing member 172, 174, 182, 184, 192, 194 Through hole S1 First step S2 Second step S3 Third step S4 Fourth Process S5 Fifth process

Claims (9)

Using a first cutting device capable of cutting concrete and metal, the first step of cutting and removing parts other than on the main girder of the floor slab,
A rail is attached to a floor slab on a main girder via a rail fixing device so that its longitudinal direction is substantially parallel to the bridge axis direction, and then can be attached to the rail and can move along the rail A second cutting device capable of cutting concrete and metal is attached to the rail, and then the main girder is moved by the second cutting device while moving the second cutting device in the bridge axis direction along the rail. A second step of horizontally cutting a portion of the upper slab near the main girder including a joint portion for joining the floor slab and the main girder, and removing the cut slab. A method for removing a floor slab, comprising: A third step of removing the floor slab remaining on the main girder with a shaving device,
On the main girder, a gantry is installed, and while the third cutting device is moved in the bridge axis direction on the gantry, a portion near the main girder of the joints remaining on the main girder is horizontally cut and cut. And a fourth step of removing the joined portion,
The floor slab removing method according to claim 1, wherein the third cutting device is capable of cutting metal, and includes a moving unit for moving in a bridge axis direction. A fifth step of removing the joint by cutting the joint remaining on the main girder with a cutting device,
The cutting device includes a cutting device main body, a spindle supported by the cutting device main body, and a tool,
The main shaft supports the tool and rotates the tool around a rotation axis.
The tool is capable of cutting metal, and has a blade on a surface parallel to the rotation axis,
The method for removing a floor slab according to claim 2, wherein the tool is rotated, and a side peripheral surface of the joint is cut along a plane parallel to a rotation axis of the tool. On the main girder, for the portion where the joining portion remains, a fifth step of installing a processing member,
The processing member has a plate shape, and a through-hole penetrating the plate surface is provided, the plate surface is installed in contact with a main girder, and the joint is accommodated in the through hole,
The method for removing a floor slab according to claim 2, wherein a thickness of the processing member is equal to or longer than a length of the joint portion accommodated in the through hole.   The gantry includes a pair of moving paths extending in parallel at an interval, and a connecting member that connects the pair of moving paths, and an interval between the pair of moving paths is longer than a width of the main girder. The method for removing a floor slab according to claim 2, 3 or 4. A rail fixing device, to which the rail can be attached, a first side fixing portion attached to one side surface of the floor slab, and a first side fixing portion connected to the first side fixing portion and attached to the upper surface of the floor slab. One upper surface fixing portion,
The first side fixing portion is fixed to one side surface of the floor slab by a fixing tool,
The method according to claim 1, 2, 3, 4, or 5, wherein the first upper surface fixing portion is fixed to the upper surface of the floor slab by a fixing tool. The rail fixing device further includes a second side fixing portion attached to the other side surface of the floor slab, and a second upper surface fixing portion connected to the second side fixing portion and attached to the upper surface of the floor slab. ,
The second side fixing portion is fixed to the other side surface of the floor slab by a fixing tool,
The second upper surface fixing portion is fixed to the upper surface of the floor slab by a fixing tool,
The method for removing a floor slab according to claim 6, wherein the first upper surface fixing portion and the second upper surface fixing portion are connected by a connecting tool. A rail fixing tool for fixing a rail to a floor slab, wherein the rail can be mounted, and a first side fixing part attached to one side surface of the floor slab, and the first side fixing part is connected to the first side fixing part. And a first upper surface fixing portion attached to the upper surface of the floor slab,
The first side fixing portion is fixed to one side surface of the floor slab by a fixing tool,
The rail fixing device, wherein the first upper surface fixing portion is fixed to the upper surface of the floor slab by a fixing device. Further, a second side surface fixing portion attached to the other side surface of the floor slab, and a second upper surface fixing portion connected to the second side surface fixing portion and attached to the upper surface of the floor slab,
The second side fixing portion is fixed to the other side surface of the floor slab by a fixing tool,
The second upper surface fixing portion is fixed to the upper surface of the floor slab by a fixing tool,
The rail fixing device according to claim 8, wherein the first upper surface fixing portion and the second upper surface fixing portion are connected by a connecting device.

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