JP7113452B2 - Floor slab removal method and rail fixture - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for removing an existing floor slab and a rail fixture used in this method.

In recent years, there has been an increase in construction work to replace the deck slabs of aging bridges. When replacing the deck slab of a bridge, it is necessary to remove the existing deck first. When removing the floor slab of a steel girder bridge, it is necessary to cleanly remove the floor slab on the main girder and the joints such as stud dowels that connect the floor slab and the main girder, and flatten the upper flange of the main girder as much as possible. There is In addition, while the work of replacing the floor slabs is being carried out, traffic will be hindered, so it is necessary to complete the work of removing the floor slabs as soon as possible.

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

However, the floor slab removal method described above is still in the experimental stage and has not yet reached the stage of being applicable to the site, and there is still room for further shortening of the construction period.

Shinsuke Akamatsu, Takumi Moro, Shigeru Matsumoto, ``Renewal of existing RC floor slabs using high-performance cast iron floor slabs,'' Hanshin Expressway 49th Technical Research Presentation Conference Proceedings

SUMMARY OF THE INVENTION An object of the present invention is to provide a floor slab removal method capable of removing a floor slab in a short period of time, and a rail fixture used for this method.

The floor slab removal method consists of the first step of cutting and removing the portion of the floor slab that is not on the main girder using the first cutting device that can cut concrete and metal, and the floor above the main girder. A rail is attached to the slab via a rail fixture so that its longitudinal direction is substantially parallel to the axis of the bridge. 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 direction of the bridge axis, the second cutting device cuts the portion of the floor slab on the main girder near the main girder. and a second step of horizontally cutting the floor slab and the main girder, including the joints, and removing the cut floor slab.

In addition, the floor slab removal method consists of the third step of removing the floor slabs remaining on the main girder with a stripping device, and installing a frame on the main girder, and moving the third cutting device on the frame in the direction of the bridge axis. and a fourth step of horizontally cutting a portion closer to the main girder out of the joints remaining on the main girder and removing the cut joints. The third cutting device is capable of cutting metal, and has moving means for moving in the direction of the bridge axis.

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

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

The rail fixture includes a first side fixing part to which a rail can be attached and which is attached to one side of the floor slab, and a first upper surface fixing part connected to the first side fixing part and attached to the upper surface of the floor slab. and have. The first side fixed part is fixed to one side of the floor slab with a fixture. Also, the first upper surface fixing portion is fixed to the upper surface of the floor slab with a fixture.

In addition, the rail fixture further comprises 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. may be The second side fixed part is fixed to the other side of the floor slab with a fixture. Also, the second upper surface fixing portion is fixed to the upper surface of the floor slab with a fixture. Also, the first upper surface fixing portion and the second upper surface fixing portion are connected by a connector.

The gantry includes a pair of movement paths extending parallel to each other with a space therebetween, and a connecting member that connects the pair of movement paths. The distance between the pair of moving paths is longer than the width of the main girder.

According to the floor slab removal method, the floor slab can be removed in a short period of time. Moreover, according to the rail fixture, the rail and the second cutting device are reliably supported by the floor slab, and the floor slab on the main girder can be safely cut.

It is a top view which shows a steel girder bridge. FIG. 2 is a sectional view taken along the line II-II of FIG. 1; 4 is a flow chart showing the procedure of the floor slab removal method of the first embodiment. It is a cross-sectional view showing how the floor slabs other than those on the main girder are removed. FIG. 4 is a plan view showing how the floor slab on the main girder is cut by the second cutting device. FIG. 6 is a sectional view taken along the line VI-VI of FIG. 5; It is a figure which shows a 1st side fixing|fixed part, (A) is a front view, (B) is a side view. It is a figure which shows a 1st upper surface fixing|fixed part, Comprising: (A) is a front view, (B) is a right view, (C) is a top view. FIG. 4 is a plan view showing how the floor slab on the main girder is cut by the second cutting device. FIG. 10 is a cross-sectional view taken along the line XX of FIG. 9; It is a figure which shows a 2nd side fixing|fixed part, Comprising: (A) is a front view, (B) is a side view. Fig. 10 is a view showing the first upper surface fixing part and the second upper surface fixing part of another form, (A) is a front view, (B) is a right side view, and (C) is a plan view; (D) is a left side view. FIG. 4 is a partial cross-sectional view showing how the floor slab on the main girder is pinched by the pincher. FIG. 4 is a plan view showing how joints on the main girder are cut by a third cutting device. FIG. 15 is a cross-sectional view taken along line XV-XV of FIG. 14; FIG. 15 is a cross-sectional view taken along line XVI-XVI of FIG. 14; It is a front view which shows a mode that the joint part on a main girder is cut with a cutting device. FIG. 4 is a side view showing how joints on the main girder are cut by a cutting device; 6 is a flow chart showing each step of the floor slab removal method of the second embodiment. FIG. 4 is a plan view showing a state in which the treatment member of the first embodiment is installed on the main girder; 21 is a cross-sectional view along line XXI-XXI of FIG. 20; FIG. FIG. 4 is a plan view showing a state in which the treatment member of the second embodiment is installed on the main girder; FIG. 23 is a cross-sectional view taken along line XXIII-XXIII of FIG. 22; FIG. 10 is a plan view showing a state in which the treatment member of the third embodiment is installed on the main girder;

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

1 and 2 show a steel girder bridge to which the floor slab removal method is applied. A steel girder bridge is mainly composed of main girders 10 , floor slabs 20 , and joints 30 .

The main girder 10 consists of an axially extending I-shaped member and includes an upper flange 12, a lower flange 14, and a web 16 connecting the upper and lower flanges 12,14. A plurality of main girders 10 are provided in the width direction and each spans over abutments, bridge piers, or the like.

The floor slabs 20 are made of reinforced concrete and are installed on the upper flanges 12 of the main girders 10 provided in the width direction. A portion of the floor slab 20 that is installed on the upper flange 12 of the main girder 10 serves as a haunch portion 22 with a thicker slab.

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

The floor slab removal method of the first embodiment includes, as shown in FIG. 3, first step S1, second step S2, third step S3, fourth step S4, and fifth step S1. and step S5.

In the first step S1, the first cutting device 40 capable of cutting concrete and metal is used to cut and remove the portion of the floor slab 20 other than the top of the main girder 10 .

Specifically, using the first cutting device 40 that vertically cuts the floor slab 20, as indicated by the dashed-dotted lines shown in FIGS. The floor slab 20 is cut in the bridge axis direction at a slightly distant position, and the floor 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 using a crane, 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 become the floor slab block 24, and the floor slab block 24 is separated from the floor slab 20. Once detached, remove with a crane.

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

In the second step S2, as shown in FIGS. 5 and 6, the rail 50 is attached to the floor slab 20 on the main girder 10 via the rail fixture 60 so that the longitudinal direction of the rail 50 is substantially parallel to the bridge axis direction. Attach to A second cutting device 120 attachable to and movable along the rail 50 and capable of cutting concrete and metal is then attached to the rail 50 . Next, while moving the second cutting device 120 along the rail 50 in the bridge axis direction, the second cutting device 120 cuts the portion of the floor slab 20 on the main girder 10 near the main girder 10 including the joint 30. Cut horizontally and remove the cut floor slab 20. - 特許庁

The rail 50 includes a rail body 52 extending in one direction and an attachment portion 54 for attaching the rail body 52 to the rail fixture 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 the bolt 56 through the through-hole and fastening the bolt 56 to a fastening hole 73 (rail fixing portion) of the rail fixture 60 to be described later.

As shown in FIGS. 5 and 6, the rail fixture 60 is capable of mounting the rail 50, and includes a first side fixing portion 70 attached to one side surface of the floor slab 20, and a first side fixing portion 70. and a first upper surface fixing portion 80 connected and attached 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 with a fixture 77 . Also, the first upper surface fixing portion 80 is fixed to the upper surface of the floor slab 20 with a fixture 87 . The rail fixture 60 is made of metal, for example.

As shown in FIG. 7, the first side fixing portion 70 is plate-shaped and has a substantially rectangular plate surface. The height of the first side fixing portion 70 is higher than the height of the side surface (surface orthogonal to the width direction) of the floor slab 20 on the main girder 10 . A through hole 74 penetrating through the plate surface is provided in the lower portion of the first side fixing portion 70 in order to fix the first side fixing portion 70 to the side surface of the floor slab 20 using a fixture 77 . An anchor bolt, for example, can be used as the fixture 77 .
In addition, a fastening hole 73 ( Rail fixing part) is provided.
In addition, a through hole 75 penetrating through the plate surface is formed in the upper portion of the first side fixing portion 70 in order to connect the first side fixing portion 70 and the first upper surface fixing portion 80 using the first connector 88 . are provided. A bolt and a nut fastened to the bolt can be used as the first connector 88 .

The first side fixing portion 70 has its plate surface aligned with the side surface (surface orthogonal to the width direction) of the floor slab 20 on the upper side of the haunch portion 22 , and anchor bolts (fixtures 77 ) are attached through through holes 74 . It is fixed to the floor slab 20 by driving it into the lower part of the floor slab 20.例文帳に追加When the first side fixing portion 70 is fixed to the side surface of the floor slab 20 , the upper end thereof is positioned 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 portion 80 includes a bottom portion 81 and a first side portion 82 connected to the bottom portion 81 . The bottom portion 81 is plate-shaped and has a substantially rectangular plate surface. The bottom portion 81 is provided with a through hole 84 penetrating through the plate surface in order to fix the first upper surface fixing portion 80 to the upper surface of the floor slab 20 using a fixture 87 . The first side portion 82 has a plate-like shape with a substantially rectangular plate surface, and the lower end thereof is aligned with one side end portion of the bottom portion 81 so that the plate surface is perpendicular to the plate surface of the bottom portion 81 . are connected. The first side portion 82 is provided with a through hole 85 penetrating through the plate surface in order to fix the first top surface fixing portion 80 to the first side surface fixing portion 70 using a first connector 88 .

As shown in FIGS. 5 and 6, the first upper surface fixing portion 80 has a side surface (plate surface) of the first side portion 82 on the first side surface fixing portion 70 side (plate surface) of the first side surface fixing portion 70 . ), the bottom surface of the bottom part 81 is aligned with the upper part of the floor slab 20, and the through hole 85 of the first side part 82 of the first top surface fixing part 80 and the first side surface are aligned. A bolt (first connector 88 ) is passed through the through hole 75 of the fixing portion 70 and a nut (first connector 88 ) is fastened to connect to the first side fixing portion 70 . Further, the first upper surface fixing portion 80 is fixed to the floor slab 20 by driving anchor bolts (fixtures 87 ) through the through holes 84 of the bottom portion 81 into the upper surface of the floor slab 20 .

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

Rather than individually attaching the first side fixing portion 70 and the first upper surface fixing portion 80 to the floor slab 20 , the rail fixture 60 is configured such that the first side fixing portion 70 and the first upper surface fixing portion 70 are fixed in advance before being attached to the floor slab 20 . It is preferable to connect the part 80 with the first connecting tool 88 and attach it to the floor slab 20 in a connected state. If the first side fixing portion 70 and the first upper fixing portion 80 are connected in advance, the rail fixing portion can be attached to the floor slab 20 more easily and efficiently.

The rail fixture 60 can take other forms as described below. As shown in FIGS. 9 and 10, another embodiment of the rail fixture 60 is to which the rail 50 can be attached, and includes a first side fixing part 70 attached to one side of the floor slab 20 and a first side 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 surface fixing portion 90 are connected. , and a second upper surface fixing portion 110 attached 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 with a fixture 77 . Also, the second side fixing portion 90 is fixed to the other side surface of the floor slab 20 by a fixture 97 . Also, the first upper surface fixing portion 100 and the second upper surface fixing portion 110 are connected by a second connector 109 . The rail fixture 60 is made of metal, for example.

Among other configurations of the rail fixture 60, the first side fixing portion 70 is the same as the first side fixing portion 70 shown in FIG. The first side fixing portion 70 has its plate surface aligned with one side surface of the floor slab 20 above the haunch portion 22 and perpendicular to the width direction, and a fixture 77 is attached to the floor slab 20 through a through hole 74 . It is fixed to the floor slab 20 by driving it into the lower part.

As shown in FIG. 11, the second side fixing portion 90 is basically the same as the first side fixing portion 70 except that it does not have a fastening hole 73 (rail fixing portion). A through hole 94 penetrating through the plate surface is provided in the lower part of the second side fixing part 90 in order to fix the second side fixing part 90 to the side surface of the floor slab 20 using a fixture 97 . In addition, a through hole 95 penetrating through the plate surface is formed in the upper portion of the second side fixing portion 90 in order to connect the second side fixing portion 90 and the second upper fixing portion 110 using the first connector 118 . are provided. The second side fixing portion 90 has its plate surface aligned with the other side surface of the floor slab 20 that is above the haunch portion 22 and perpendicular to the width direction. It is fixed to the floor slab 20 by driving it into the lower part. Anchor bolts, for example, can be used as the fixtures 77 and 97 . When the first side fixed part 70 and the second side fixed part 90 are fixed to the side surface of the floor slab 20 , the upper end thereof is positioned higher than the upper surface of the floor slab 20 and protrudes above the upper surface of the floor slab 20 . It 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 fixing part 100 and the second upper fixing part 110 have bottoms 101, 111, and first side parts 102, 112 and second side parts 103, 113 connected to the bottoms 101, 111, respectively.

The bottoms 101 and 111 are plate-shaped, and the plate surfaces are substantially rectangular. The first side portions 102 and 112 are plate-shaped and have substantially rectangular plate surfaces. is connected to the side end of the Each of the second side portions 103 and 113 has a plate-like shape with a substantially rectangular plate surface. It is connected to the other side end of 111 .

The first side portion 102 of the first upper surface fixing portion 100 has a through hole penetrating through the plate surface for connecting the first upper surface fixing portion 100 and the first side surface fixing portion 70 using the first connector 108 . 104 are provided. In addition, the first side portion 112 of the second upper surface fixing portion 110 has a first connector 118 that penetrates the plate surface to connect the second upper surface fixing portion 110 and the second side surface fixing portion 90 using a first connector 118. A through hole 114 is provided. A bolt and a nut fastened to the bolt can be used as the first couplers 108 and 118 . 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 connector 109 . For this purpose, through holes 105 and 115 are provided through the plate surface. A bolt and a nut fastened to the bolt can be used as the second connector 109 .

The first upper surface fixing portion 100 is configured such that the side surface (plate surface) of the first side portion 102 on the side of the first side surface fixing portion 70 is positioned above the upper surface of the floor slab 20 among the side surfaces (plate surface) of the first side surface fixing portion 70 . Aligning with the projecting portion, the bolt (first connector 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 fixing portion 70, and the nut (first connector 108 ), it is connected to the first side fixing portion 70 .
The second upper surface fixing portion 110 is configured such that the side surface (plate surface) of the first side portion 112 on the side of the second side surface fixing portion 90 is positioned above the upper surface of the floor slab 20 among the side surfaces (plate surface) of the second side surface fixing portion 90 . The bolt (first connector 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 fixing portion 90, and the nut (first connector 118), it is connected to the second side fixing portion 90. As shown in FIG.
The first upper surface fixing portion 100 and the second upper surface fixing portion 110 are connected to the through holes 105 and 115 of the respective second side portions 103 and 113 by passing the bolts (second connector 109) through the nuts (second connector 109). are connected by concluding the

Note that the first upper surface fixing part 100 and the second upper surface fixing part 110 may be fixed to the upper surface of the floor slab 20 using fixing tools such as anchor bolts. In this case, through holes penetrating through the plate surface 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, and anchor bolts are driven into the upper surface of the floor slab 20 through the through holes. The first upper surface fixing part 100 and the second upper surface fixing part 110 can be fixed to the floor slab 20 .

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

Before the rail fixture 60 is attached to the floor slab 20, the first side fixing part 70 and the first upper surface fixing part 100 are connected by the first connector 108, and the second side fixing part 90 and the second upper surface fixing part 110 are connected. are connected by the first connector 118, and the first upper surface fixing portion 100 and the second upper surface fixing portion 110 are temporarily connected by the second connector 109, the rail fixing portion can be more easily and efficiently attached to the floor slab 20. can be attached to

The second cutting device 120 is a device capable of cutting concrete and reinforcing bars, and a wall saw is used in this embodiment. The second cutting device 120, as shown in FIGS. 5 and 6, is attached to the rail 50 and movable along the rail 50. A disc-shaped cutter 124 that is driven to rotate by the second cutting device main body 122 is provided. The cutter 124 has a blade capable of cutting concrete and metal on the outer peripheral edge of the disc, and rotates around the center of the disc. When the second cutting device 120 is attached to the rail 50, the rotating shaft of the cutter 124 is parallel to the vertical direction, and the board surface is perpendicular to the vertical direction. In addition, the second cutting device 120 may be provided with movement driving means 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. 5 to 12. FIG. First, before attaching the rail fixture 60 to the floor slab 20 on the main girder 10, the first side fixing part 70 and the first upper surface fixing part 80 of the rail fixture 60 are connected in advance by the first connector 88, and these be integrated. When using the rail fixture 60 of another mode, the first side fixing part 70 and the first upper fixing part 100 are connected by the first connector 108, and the second side fixing part 90 and the second upper fixing part 110 are connected. are connected by a first connector 118, and further the first upper surface fixing portion 100 and the second upper surface fixing portion 110 are temporarily connected by a second connector 109 to integrate each component of the rail fixing device 60 in advance.

Next, the integrated rail fixtures 60 are installed on the top and side surfaces of the floor slab 20 and fixed to the floor slab 20 using fixtures 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 fixture 60 by passing a bolt 56 through a through hole (not shown) of the attachment portion 54 and fastening the bolt 56 to the fastening hole 73 of the first side fixing portion 70 . Next, when 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 along the rail 50 in the bridge axis direction, the portion of the floor slab 20 on the main girder 10 near the main girder 10 such as the haunch portion 22 is horizontally cut including the joint portion 30. cut to 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 floor slab block. When using a crane, before cutting the floor slab 20, the crane is connected in advance to the part where the floor slab 20 is cut, and when the floor slab block is cut off from the floor slab 20, it is removed by the crane.

When the second step S2 is completed, the floor slabs 20 and joints 30 that could not be 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 near the main girder 10 is cut by the second cutting device 120, so the portion of the floor slab 20 including the reinforcing bars 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 slabs 20 and the joints 30 remaining on the main girder 10 after the second step S2 are removed using a scraper 130. .

A concrete chipper or a concrete breaker can be used as the scraping device 130 .

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

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

The moving path 142 serves as a path for the third cutting device 150, is made of metal, is made 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 so that their longitudinal directions are parallel to each other while maintaining a gap in the width direction with the plate surfaces perpendicular to the vertical direction. The interval between them is the width of the main girder 10 , in other words, the width of the upper flange 12 of the main girder 10 or longer.

The movement path connection part 144 is for connecting a pair of movement paths 142, 142 arranged with a gap therebetween, and is made of metal and consists of a plate-like member extending in one direction. The moving path connection part 144 is connected to the front and rear parts of the upper surfaces of the pair of moving paths 142, 142 in a state where the plate surface is orthogonal to the vertical direction and the longitudinal direction is orthogonal to the longitudinal direction of the moving path 142. be done.

The moving path 142 and the moving path connecting portion 144 are provided with through-holes 145 and 146 penetrating through the respective plate surfaces in the portion where the two overlap to fix them with the third connecting tool 148 . A bolt and a nut fastened to the bolt can be used as the third connector 148 . The pair of moving paths 142, 142 and the moving path connecting portion 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 gate shape when viewed from the front, and wheels are provided on the sides thereof 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 lateral direction, and rotates, so that the third cutting device 150 can move in the front-rear direction.

The third cutting device main body 151 has a pair of pulleys 154,154. A pair of pulleys 154, 154 are rotatably supported on a rotating shaft that rotates about the front-rear direction at the left and right leg portions of the gate. At least one pulley 154 is rotationally driven 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 , 154 . The cutter 152 is vertically horizontal between the pair of pulleys 154 , 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 spanned by the pair of pulleys 154, 154 is the portion that cuts the object to be cut. Located nearby.

The third cutting device 150 horizontally cuts the object to be cut by circulating the cutter 152 with a pulley 154 while moving in the bridge axis direction. At this time, the third cutting device 150 is moved while passing the joint portion 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. 14 to 16. FIG. First, the frame 140 is installed on the upper flange 12 of the main girder 10 . In the frame 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 positioned between the pair of moving paths 142, 142, and the moving path connecting portion 144 extends in the width direction. It is installed on the upper flange 12 of the main girder 10 in a state of being substantially parallel to. In addition, the frame 140 is installed at a position where the moving path connecting portion 144 does not interfere with the joint portion 30 remaining on the upper flange 12 of the main girder 10 . Once the cradle 140 is installed on the upper flange 12 of the main girder 10 , the cradle 140 is fixed to the main girder 10 using fixing means 149 . A vise, for example, can be used as the fixing means 149 . The frame 140 is fixed to the main girder 10 by fixing the travel path connecting portion 144 and the upper flange 12 in a vise.

Next, the third cutting device 150 is installed on the pair of moving paths 142, 142 of the frame 140 so that the longitudinal direction thereof is parallel to the bridge axis direction. Then, while the cutters 152 are circulated, the third cutting device 150 is moved in the direction of the bridge axis to horizontally cut the joints 30 remaining on the main girder 10 . At this time, if there are a plurality of joints 30 in the width direction, the joints 30 in the width direction are collectively cut by the third cutting device 150 at the same time. 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 direction of the bridge axis, and all the joints 30 on the main girder 10 are cut. Repeat the above steps until cut.

When the fourth step S4 is completed, on the main girder 10, the joints 30 that could not be completely cut in the fourth step S4 will remain.

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

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

The cutting device body 161 also has 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 portion 164 has a bottom portion 165 and side portions 166 connected to the bottom portion 165 . The bottom portion 165 is plate-shaped and has a substantially rectangular plate surface. The side portion 166 has a plate-like shape with a substantially rectangular plate surface, and its lower end is connected to one side end portion of the bottom portion 165 so that the plate surface is perpendicular to the plate surface of the bottom portion 165 . there is 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 fasteners such as screws so that the bottom surface of the bottom portion 165 is substantially horizontal.

The main shaft 167 supports the tool 168 and rotates the tool 168 with the vertical direction as a rotation axis.

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

The cutting device 160 can move the main shaft 167 and the tool 168 in the horizontal direction or move them up and down by operating the operation portion 163 .

Based on the above configurations, the fifth step S5 will be specifically described with reference to FIGS. 17 and 18. FIG. First, the cutting device 160 is installed such that the longitudinal direction of the cutting device 160 is substantially parallel to the width direction of the main girder 10 and the tool 168 is positioned laterally 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 brought close to the upper surface of the upper flange 12 so as not to be in 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 with a fixing means 149 such as a vise. When the cutting device 160 is fixed to the main girder 10, cutting of the joint 30 can be easily performed, the finish of cutting is improved, and cutting can be performed efficiently.

Next, by rotating the tool 168 of the cutting device 160 and operating the operation part 163 to move the tool 168, one or more joints 30 in the width direction of the main girder 10 are individually cut and removed. continue. At this time, the side peripheral surface of the tool 168 is brought into contact with the side peripheral surface of the joint portion 30 to cut the joint portion 30 . For the joint portion 30 that cannot be cut within the range where the cutting device 160 is installed, the cutting device 160 is moved to the opposite side of the upper flange 12 in the width direction and installed, or moved in the bridge axis direction and installed. 30 cuts are made.

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

Note that the cutting device 160 may not include both or one of the moving section 162 and the lifting section. Moreover, the cutting device 160 may not include the installation portion 164 . If the installation portion 164 is not provided, the cutting device 160 cuts the joint portion 30 without being fixed to the main girder 10 .

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

Moreover, the floor slab removal method of the first embodiment includes the second step S2, so that most of the floor slab 20 remaining on the main girder 10 can be cut and removed in a short period of time. Also, if the rail 50 and the second cutting device 120 are attached to the side surface of the floor slab 20 on the main girder 10 via the rail fixture 60 that is attached only to the side surface of the rail 50, the thickness of the floor slab 20 will be 2. Since it is relatively thin compared to the cutting device 120, the space for driving the fixture for fixing the rail fixture 60 to the floor slab 20 and the range for attaching the mounting portion 54 of the rail 50 are narrow. Although there is a problem that the rail 50 and the second cutting device 120 cannot be reliably supported by the slab 20, in the second step S2, the rail fixtures 60 are fixed to the upper and side surfaces of the floor slab 20, so the rails 50 and the second cutting device 120 can be reliably supported by the floor slab 20 . Further, in the rail fixture 60, as in the embodiment, the height of the first side fixing portion 70 is higher than the height of the side surface (surface orthogonal to the width direction) of the floor slab 20 on the main girder 10, and the first 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 mounting portion 54 of the rail 50 can be mounted in a wide range in the vertical direction. can be reliably fixed to the first side fixing portion 70 , and thus the rail 50 and the second cutting device 120 can be more reliably supported by the floor slab 20 . Further, in the second step S2, before installing the rail fixture 60 on the floor slab 20, if the first upper surface fixing part 80 and the first side fixing part 70 are connected in advance by the first connector 88, The rail fixture 60 can be attached to the floor slab 20 easily and in a short time.

Moreover, the floor slab removal method of the first embodiment includes the fourth step S4, so that the joints 30 remaining on the main girder 10 can be cut and removed in a short period of time. In addition, in the fourth step S4, it is easy to move and install the frame 140, and when the cutting of the joint portion 30 in the range where the frame 140 is installed is completed, the frame 140 is moved in the direction of the bridge axis to move the main girder 10. , and the cutting of the joint 30 remaining on the main girder 10 by the third cutting device 150 can be repeated.

Further, the floor slab removal method of the first embodiment includes the fifth step S5, in which the cutting device 160 is used to cut and remove the joint 30 remaining on the main girder 10. The work time can be greatly shortened and the removed surface can be remarkably finely finished compared to the case of polishing and removing the joint portion 30 with a polishing device such as a grinder.

Next, a floor slab removal method according to the second embodiment will be described. The floor slab removal method of the second embodiment includes, as shown in FIG. 19, first step S1, second step S2, third step S3, fourth step S4, and fifth step S1. and step S5. Since the floor slab removal method of the second embodiment differs 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 FIGS. 20 to 24, treatment members 170, 180, 190 are installed on the portion of the main girder 10 where the joint 30 remains.
The processing members 170, 180, and 190 are plate-like members made of metal, and have through holes 172, 182, and 192 penetrating through the plate surface. The through holes 172 , 182 , 192 are for accommodating the joints 30 in the holes, and are provided at positions where the joints 30 are present. The diameters of the through holes 172 , 182 , 192 are large enough to accommodate the joints 30 in the through holes 172 , 182 , 192 . The thickness of the processing members 170 , 180 , 190 is set so that the joints 30 do not protrude from the through holes 172 , 182 , 192 when the processing members 170 , 180 , 190 are installed on the main girder 10 . It is equal to or longer than the length of the portion 30 .

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

The treatment members 170, 180, 190 are provided with floor slab fixtures (not shown) for attaching the new floor slab 20 to the main girder 10 on their upper surfaces. fixed to Therefore, the processing members 170, 180, 190 may be provided with through-holes 174, 184, 194 for passing the bolts in advance. Also, the through holes 172, 182, 192 of the treatment members 170, 180, 190 installed on the main girder 10 may be filled with a filler such as putty in order to backfill the holes.

Several aspects of the processing members 170, 180, 190 are described below. As shown in FIGS. 20 and 21, the first embodiment of the processing member 170 has a rectangular plate surface, can accommodate a plurality of joints 30 in the longitudinal direction, and can accommodate all joints 30 in the width direction. A plurality of through holes 172 are provided to accommodate the joints 30 . A first aspect of the processing member 170 is that 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 that all the joints 30 are accommodated in the through holes 172. may not be installed in the joint portion 30 of the section.

As shown in FIGS. 22 and 23, the second embodiment of the processing member 180 has a rectangular plate surface and has a plurality of through holes 182 capable of accommodating a plurality of joints 30 in the bridge axis direction. . A second aspect of the processing member 180 is that a plurality of processing members 180 can be installed in the bridge axial direction and the width direction, and a plurality of processing members 180 are installed so that all the joints 30 are accommodated in the through holes 182 in the bridge axial direction and the width direction. Alternatively, they may not be installed in the joint portions 30 of some sections. A second aspect of the processing member 180 is that, from the viewpoint of installing a new member on the processing member 180, it should be installed at the joints 30 aligned in the bridge axis direction at least on the outermost side in the width direction. is preferred.

As shown in FIG. 24, the processing member 190 according to the third embodiment has a rectangular plate surface and has a plurality of through holes 192 that can accommodate all the joints 30 arranged in the width direction. A third aspect of the treatment member 190 is that a plurality of processing members 190 can be provided in the bridge axis direction. It may not be installed at the joint portion 30 of the section.

In addition, the processing members 170 , 180 , 190 may have one through-hole and can accommodate one joint 30 .

According to the floor slab removal method of the second embodiment, in the fifth step S5, the processing members 170, 180, and 190 are installed on the portions where the joints 30 remain, and the joints 30 are formed through the through holes 172. , 182 and 192, the top of the main girder 10 can be flattened and there is no need to completely remove the joint 30 remaining on the main girder 10. The construction period for removing the plate 20 can be greatly shortened.

The floor slab removal method of the present invention and the rail fixtures used therein are not particularly limited to the above-described embodiments, and can be appropriately modified within the scope of the present invention.

10 main girder 12 upper flange 14 lower flange 16 web 20 floor slab 22 haunch portion 24 floor slab block 30 joint portion 40 first cutting device 50 rail 52 rail main body 54 mounting portion 56 bolt 60 rail fixture 70 first side fixing portion 73 Fastening hole (rail fixing part)
74, 75 Through hole 77 Fixing tool 80 First upper fixing part 81 Bottom part 82 First side part 84, 85 Through hole 87 Fixing tool 88 First connecting tool 90 Second side fixing part 94, 95 Through hole 97 Fixing tool 100 Second One upper surface fixing part 101 Bottom part 102 First side part 103 Second side part 104, 105 Through hole 108 First connector 109 Second connector (connector)
110 second upper surface fixing part 111 bottom part 112 first side part 113 second side part 114, 115 through hole 118 first connector 120 second cutting device 122 second cutting device main body 124 cutter 130 picking device 140 mount 142 moving path 144 moving path connecting portion 145, 146 through hole 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 portion 165 Bottom portion 166 Side portion 167 Spindle 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 step Step S5 Fifth step

Claims (9)

a first step of cutting and removing a portion of the floor slab other than the main girder using a first cutting device capable of cutting concrete and metal;
A rail can be attached to the floor slab on the main girder via a rail fixture so that the longitudinal direction of the rail is substantially parallel to the bridge axis direction, and then can be attached to the rail, along the rail. A movable second cutting device capable of cutting concrete and metal is attached to the rail, and then the second cutting device moves the second cutting device along the rail in the direction of the bridge axis while the second cutting device cuts the a second step of horizontally cutting a portion of the floor slab on the main girder near the main girder including the joint portion joining the floor slab and the main girder, and removing the cut floor slab; A method for removing a floor slab, comprising: a third step of removing the floor slabs remaining on the main girder with a scraping device;
A trestle is installed on the main girder, and while moving the third cutting device on the trestle in the direction of the bridge axis, of the joints remaining on the main girder, the part near the main girder is cut horizontally. and a fourth step of removing the joined portion,
2. The floor slab removal method according to claim 1, wherein said third cutting device is capable of cutting metal, and is provided with moving means for moving in the direction of the bridge axis. A fifth step of removing the joint portion by cutting the joint portion remaining on the main girder with a cutting device,
The cutting device includes a cutting device body, a spindle supported by the cutting device body, and a tool,
The spindle supports the tool and rotates the tool around a rotation axis,
The tool is capable of cutting metal and has a blade in a plane parallel to the axis of rotation,
3. The floor slab removal method according to claim 2, wherein the tool is rotated to cut the side peripheral surface of the joint portion with a plane parallel to the rotation axis of the tool. A fifth step of installing a treatment member on a portion of the main girder where the joint remains,
The processing member is plate-shaped and provided with a through hole passing through the plate surface, the plate surface is installed in contact with the main girder, and the joint portion is accommodated in the through hole,
3. The floor slab removing method according to claim 2, wherein the thickness of the processing member is equal to or greater than the length of the joint portion accommodated in the through hole. The gantry includes a pair of movement paths extending parallel to each other at a distance, and a connecting member connecting the pair of movement paths, wherein the distance between the pair of movement paths is longer than the width of the main girder. The floor slab removal method according to claim 2, 3 or 4. The rail fixture includes a first side fixing part, to which the rail can be attached, which is attached to one side surface of the floor slab, and a second side fixing part, which is connected to the first side fixing part and is attached to the upper surface of the floor slab. and a fixing part on one upper surface,
The first side fixed part is fixed to one side of the floor slab by a fixture,
6. The floor slab removal method according to claim 1, wherein the first upper surface fixing portion is fixed to the upper surface of the floor slab with a fixture. The rail fixture further comprises a second side fixing portion attached to the other side 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 fixed part is fixed to the other side of the floor slab by a fixture,
The second upper surface fixing part is fixed to the upper surface of the floor slab with a fixture,
7. The floor slab removal method according to claim 6, wherein said first upper surface fixing portion and said second upper surface fixing portion are connected by a connector. A rail fixture for fixing a rail to a floor slab, comprising: a first side fixing part to which the rail can be attached and which is attached to one side of the floor slab; and a connection with the first side fixing part. and a first upper surface fixing portion attached to the upper surface of the floor slab,
The first side fixed part is fixed to one side of the floor slab by a fixture,
A rail fixture, wherein the first upper surface fixing portion is fixed to the upper surface of the floor slab by a fixture. Furthermore, a second side fixed part attached to the other side of the floor slab, and a second upper surface fixed part connected to the second side fixed part and attached to the upper surface of the floor slab,
The second side fixed part is fixed to the other side of the floor slab by a fixture,
The second upper surface fixing part is fixed to the upper surface of the floor slab with a fixture,
9. The rail fixture according to claim 8, wherein said first upper surface fixing part and said second upper surface fixing part are connected by a connector.

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