Cutting device and method for assembling the same

Abstract

To provide a cutting device allowing efficient setting work and transfer work thereof, in a narrow work space under a concrete slab.SOLUTION: A cutting device cuts and separates a joint part of a concrete slab and a main girder of a bridge. The cutting device includes: a wire saw forming a cut surface along the main girder in the joint part; a driven pulley guiding the wire saw in a direction along the cut surface; a support mechanism detachably set on the main girder; and a driving unit supported by the support mechanism and making the wire saw travel around.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a cutting device used to cut and separate a joint between a concrete deck and a main girder, and a method for assembling the cutting device. [Background technology]

[0002] Bridge deck renewal work involves replacing deteriorated concrete decks with new, more durable ones, and traffic must be blocked during this work. This means that construction traffic restrictions, such as road closures to general vehicles and various traffic restrictions, must be implemented, but the duration of these restrictions must be minimized to minimize the impact on existing traffic.

[0003] However, replacing the deck with a new one requires removing the existing concrete deck from the bridge girder, a process that takes a significant amount of time. In particular, removing the concrete around the shear stop of the composite girder, which was streamlined by integrating the behavior of the deck and bridge girder, took longer than that of a non-composite structure.

[0004] In this situation, in order to minimize the time traffic restrictions are imposed during construction work, various deck cutting devices have been developed that can be placed under the deck so that cutting work on the concrete deck can begin as soon as traffic restrictions for construction work arrive. For example, Patent Document 1 discloses a deck cutting device that uses a wire saw to cut the joint interface between the concrete deck and the bridge girder.

[0005] Specifically, a wire saw cutting device equipped with a drive pulley, a fixed pulley, and a movable pulley is placed on one side of the bridge girder. A driven pulley is placed on the other side. All of these pulleys are installed on the underside of the concrete deck so that they rotate horizontally within a horizontal plane that includes the joint interface between the concrete deck and the bridge girder. The wire saw is inserted through a small-diameter drilling section close to the joint interface and is looped around each of the pulleys.

[0006] In this state, when the drive pulley is operated, the wire saw travels in the extension direction, and the cutting operation to cut the bonded interface begins. As the cutting operation progresses, the wire saw relaxes, so the position of the movable pulley relative to the fixed pulley is adjusted to retract the wire saw into the cutting device. In this way, by maintaining tension on the wire saw so that it can cut the concrete deck, a cutting surface parallel to the bonded interface is formed, and the concrete deck and bridge girder can be cut and separated. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 6626599 Summary of the Invention [Problem to be solved by the invention]

[0008] According to Patent Document 1, the work of cutting and separating the concrete deck and the bridge girder can be carried out under the concrete deck. However, when installing the deck cutting device under the concrete deck in the advance preparation stage before starting the cutting work, it becomes necessary to install the wire saw cutting device in a hanging state on the underside of the concrete deck.

[0009] These generally involve drilling holes in the underside of the concrete slab to create anchor holes, which are then supported by post-installed anchors. This type of work requires workers to perform the work while facing upward, which is both unsatisfactory and unsafe. Furthermore, concrete slabs are often densely packed with reinforcing bars, which not only makes the drilling process cumbersome, but also makes it difficult to install the wire saw cutting device in the desired location when the anchor holes are drilled while avoiding these reinforcing bars.

[0010] Furthermore, in the deck cutting device of Patent Document 1, the wire saw cutting device is equipped with not only the drive pulley, fixed pulley, and movable pulley described above, but also various other devices such as a cooling device for the drive unit and wire saw, and is installed on the underside of the concrete deck. This means that the number of anchors required for suspension support becomes enormous, and the installation work tends to become more complicated.

[0011] Furthermore, as the cutting work progresses, relocation work is required, and each relocation requires the work of removing the post-installed anchors to remove the wire saw cutting device and the work of installing the post-installed anchors to install the wire saw cutting device at the new location, which can require a lot of work time.In addition, since these wire cutting devices are installed on the underside of the concrete deck, the work space under the low-head concrete deck tends to become even more narrow, creating challenges in the work environment.

[0012] The present invention has been made in consideration of the above-mentioned problems, and its main object is to efficiently install and relocate a cutting device in a narrow working space under a concrete slab. [Means for solving the problem]

[0013] In order to achieve this object, the cutting device of the present invention is a cutting device for cutting and separating the joint between the concrete deck and main girder of a bridge, and includes a wire saw that forms a cutting surface along the main girder at the joint, a driven pulley that guides the wire saw in a direction along the cutting surface, a support mechanism that is detachably installed on the main girder, and a drive unit that is supported by the support mechanism and causes the wire saw to travel in a circular motion. The drive unit includes a pulley guide in an upright position that guides the up and down movement of the drive pulley, and the support mechanism includes a drive support beam that supports the pulley guide. The present invention is characterized by comprising:

[0014] The cutting device of the present invention is characterized in that the support mechanism is installed on the lower flange of the main girder or on a cross beam connected to the main girder.

[0015] The cutting device of the present invention is characterized in that the support mechanism is installed on the web of the main girder.

[0016] The cutting device of the present invention is characterized in that it is installed on the vertical stiffening member of the main girder.

[0018] In the cutting device of the present invention, the drive unit The aforementioned Drive pulley and the pulley guide a storage mechanism having a guide pulley around which the excess length of the wire saw is hung; and a guide mechanism having a direction changing part that changes the extension direction of the wire saw along the cutting surface.

[0019] In the cutting device of the present invention, the drive unit includes a frame that is detachably mounted on the support mechanism, and the frame is a columnar frame on which the drive pulley is mounted. The aforementioned The device is characterized by being composed of a pulley guide, a columnar pulley holder provided in the storage mechanism and on which the guide pulley is installed, and a beam-shaped connecting member provided in the guide mechanism, on which the direction change section is installed and which connects the pulley guide and the pulley holder.

[0020] The cutting device of the present invention is characterized in that the frame is fixed to the support mechanism at least at three points.

[0021] The method for assembling a cutting device of the present invention is characterized by comprising the steps of: installing the support mechanism on the main beam or the counter beam; and installing the drive unit on the support mechanism.

[0022] According to the cutting device and assembly method of the present invention, the cutting device is provided with a support mechanism that is detachably attached to the main girder or counter-tilt structure, and a drive unit that is supported by the support mechanism and drives the wire saw. This allows the drive unit to be installed below the concrete slab without the need for a worker to perform complicated tasks such as placing it under the concrete slab using post-installed anchors while facing upward, or drilling anchor holes while avoiding the rebar in the concrete slab. Furthermore, when relocating the drive unit, which occurs as the cutting work progresses, the drive unit can be removed and the support mechanism removed from the main girder, and then the support mechanism can be installed on the main girder at the new location, and the drive unit can be reinstalled.

[0023] This makes it possible to improve the efficiency of the work involved in installing and relocating the entire cutting device, including the drive unit, under the concrete deck. Furthermore, because there are no restrictions on the installation position of the drive unit, there is a high degree of freedom, so the drive unit can be installed while adjusting its position to ensure sufficient working space in the narrow area under the concrete deck. This makes it possible to improve the ease of the entire work of cutting and separating the concrete deck and main girder.

[0024] Furthermore, the drive unit frame can be assembled simply by connecting the columnar pulley guide in the drive mechanism and the columnar pulley holder in the storage mechanism with the beam-shaped connecting member in the guide mechanism. Furthermore, the drive unit can be installed below the concrete slab simply by installing the frame on the support mechanism. This reduces the number of installation steps and saves labor compared to handling the drive mechanism, storage mechanism, and guide mechanism separately.

[0025] Furthermore, if the assembled frame is fixed to the support mechanism at least at three points, the drive unit equipped with the frame can be stably supported by the support mechanism. When relocating the cutting device, it becomes possible to relocate the frame in its assembled state, i.e., the drive unit, and this also shortens the overall construction time for cutting and separating the concrete deck and main girder.

[0026] In addition, the drive unit is equipped with a direction changer that changes the extension direction of the wire saw along the cutting surface. This allows the extension direction of the wire saw to be changed so that it runs in a direction along the web of the main girder, so the drive unit can be installed upright along the web of the main girder. Therefore, combined with the ability to adjust the installation position of the drive unit, it is possible to further increase the degree of freedom in installation position. [Effects of the Invention]

[0027] According to the present invention, a support mechanism that can be attached and detached to the main girder or counter-tilt structure and a drive unit that is supported by this support mechanism and runs the wire saw in a circular motion are provided, making it possible to efficiently install and relocate the cutting device, including the drive unit, in the narrow working space under the concrete deck. [Brief explanation of the drawings]

[0028] [Figure 1] 1 is a side view showing a cutting device according to an embodiment of the present invention, as viewed from the bridge axis direction. FIG. [Figure 2] 1 is a plan view of a cutting device according to an embodiment of the present invention. [Figure 3] 1A and 1B are diagrams illustrating how a cut surface is formed by a cutting device according to an embodiment of the present invention. [Figure 4] 2A and 2B are a front view and a plan view of a drive unit and a support mechanism according to the embodiment of the present invention. [Figure 5] 10A and 10B are diagrams illustrating other examples of installation positions of the support mechanism according to the embodiment of the present invention. [Figure 6] FIG. 10 is a diagram (viewed from a direction perpendicular to the bridge axis) showing another example (part 1) of a support mechanism for supporting a drive unit in an embodiment of the present invention. [Figure 7] FIG. 10 is a diagram (front view) showing another example (part 1) of the support mechanism for supporting the drive unit according to the embodiment of the present invention. [Figure 8]FIG. 10 is a diagram (viewed from a direction perpendicular to the bridge axis) showing another example (part 2) of the support mechanism that supports the drive unit in the embodiment of the present invention. [Figure 9] FIG. 10 is a diagram (front view) showing another example (part 2) of the support mechanism for supporting the drive unit in the embodiment of the present invention. [Figure 10] FIG. 10 is a diagram (viewed from a direction perpendicular to the bridge axis) showing another example (part 3) of the support mechanism that supports the drive unit in the embodiment of the present invention. [Figure 11] FIG. 10 is a diagram (front view) showing another example (third example) of the support mechanism for supporting the drive unit in the embodiment of the present invention. [Figure 12] FIG. 10 is a diagram (front view) showing another example of the drive unit according to the embodiment of the present invention. [Figure 13] FIG. 10 is a diagram (plan view) showing another example of the drive unit according to the embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0029] The present invention is a cutting device used to cut and separate the concrete deck and main girder during deck renewal work on road bridges.It is equipped with a support mechanism that can be attached and detached to the main girder or counter-girder, and this support mechanism supports a drive unit that runs the wire saw in a circular motion, thereby improving work efficiency when installing the drive unit under the concrete deck.

[0030] The cutting device and the method for assembling the cutting device will be described in detail below with reference to Figures 1 to 13, taking as an example a case where a joint between a concrete deck slab and a main girder is cut and separated using a push-cutting method with a wire saw. Note that the cutting method using a wire saw is not limited to the push-cutting method, and can also be used with other cutting methods such as a pull-cutting method.

[0031] As shown in Figure 1, the bridge 200 has a steel main girder 201 and a concrete slab 202 placed on the main girder 201, and a haunch 204 is formed on the underside of the concrete slab 202, which serves as a joint with the main girder 201. In addition, headed studs 2011 are embedded in the haunch 204 and are installed in the upper flange 201c of the main girder 201. The headed studs 2011 are members that function as a stopper for the concrete slab 202 in the approximately horizontal direction (mainly in the bridge axis direction).

[0032] When deck replacement work is carried out on the composite bridge 200 in which the concrete deck 202 and steel main girder 201 are integrated, first, a cutting device 100 equipped with a wire saw 10, which is widely used when cutting concrete structures, is used to form a cut surface C in the haunch portion 204 as shown in FIG. 2. After this, the concrete deck 202 that has been cut and separated from the main girder 201 is removed and replaced with a new concrete deck. The cutting device 100 equipped with the wire saw 10 used when forming the cut surface C in the haunch portion 204 will be described below.

[0033] ≪≪≪Cutting device 100≫≫≫ The wire saw 10 is a member formed by processing a diamond saw wire into an endless shape, and the cutting device 100 has a structure as shown in FIG.

[0034] The wire saw 10 includes, in that order along its extension direction, first and second front support devices 40a, 40b, first and second rear support devices 50a, 50b, and a drive unit D. The drive unit D also includes a drive mechanism 20, a storage mechanism 30, and a guide mechanism 70. As shown in FIG. 1 , the cutting device 100 also includes a support mechanism 80 that supports the drive unit D, and a pair of traveling rails 60 provided on both sides of the haunch portion 204.

[0035] 1 and 3, the pair of traveling rails 60 includes a guide portion 61 extending along the main girder 201 and a guide support 62 that supports the guide portion 61. The guide support 62 is detachably installed on the underside of the concrete floor slab 202 and suspends the guide portion 61. The guide support 62 is slidably installed relative to the guide portion 61, and the guide portion 61 is installed movable in the height direction relative to the guide support 62.

[0036] 2, the first and second rear support devices 50a, 50b have third to fifth driven pulleys 51, 52, 53 around which the wire saw 10 is respectively wound, and a pulley frame 56 that supports these. Furthermore, as shown in FIG. 1, the pulley frame 56 has a moving body 55 that moves along a guide portion 61 formed on the underside of the traveling rail 60, and a feed device 54 that drives the moving body 55 and moves the first and second rear support devices 50a, 50b.

[0037] A pinion is used for the moving body 55, and the pulley frame 56 is supported on the upper surface side of the traveling rail 60. As shown in Fig. 2, the first and second front support devices 40a and 40b are disposed in front of the first and second rear support devices 50a and 50b (upper side of the drawing).

[0038] 2 and 3, the first and second front support devices 40a, 40b have first and second driven pulleys 41-42 around which the wire saw 10 is wound, respectively, and a pulley frame 46 that supports them. Furthermore, like the first and second rear support devices 50a, 50b, the pulley frame 46 has a moving body 45 that moves along a guide portion 61 formed on the underside of the traveling rail 60, and a feed device 44 that drives the moving body 45.

[0039] The first and second driven pulleys 41-42 supported by the first and second front support devices 40a, 40b and the third to fifth driven pulleys 51-53 supported by the first and second rear support devices 50a, 50b are all pulleys that rotate horizontally and change the direction of the wire saw 10 within a horizontal plane. Between the first driven pulley 41 and the third driven pulley 51, the wire saw 10 passes through the haunch portion 204. In this embodiment, the horizontal direction refers to a direction parallel to the upper flange 201c of the main girder 201.

[0040] <<Drive unit>> As shown in Figure 2, the drive unit D is an integrated structure in which the drive mechanism 20 and the storage mechanism 30 are connected by a guide mechanism 70, and as shown in Figure 1, it is positioned below the concrete deck slab 202 in an upright position parallel to the web 201b of the main girder 201.

[0041] The drive mechanism 20 applies a constant tension and high-speed rotational force to the wire saw 10, and as shown in FIG. 1, includes a pulley guide 22 in an upright position and an elevating device 23 that moves up and down along the pulley guide 22, with a flat support plate 221 attached to the lower end of the pulley guide 22. The elevating device 23 also includes a drive pulley 21 that rotates the wire saw 10 and a drive unit 24 that drives the drive pulley 21. The drive pulley 21 is attached to the elevating device 23 via a horizontal shaft, and rotates vertically around the horizontal shaft to apply high-speed rotational force to the wound wire saw 10. The wire saw 10 is also tensioned by moving up and down along the pulley guide 22 via the elevating device 23.

[0042] The storage mechanism 30 stores the excess length of the wire saw 10 while maintaining a certain tension, and also unwinds the wire saw 10 in stages as the cutting operation of the haunch portion 204 progresses and the first and second front support devices 40a, 40b move forward. Any structure may be adopted as long as it has these functions.

[0043] In Figure 4(a), a pulley holder 31 in an upright position and equipped with first to third guide pulleys 32 to 34 that rotate vertically is used as the storage mechanism 30. A jack base 35 is provided at the lower end of the pulley holder 31, and the height position of the base part 352 can be adjusted by extending or retracting the jack part 351. In the drive unit D, a pair of storage mechanisms 30 configured in this way are provided, one on each side of the drive mechanism 20 in the bridge axis direction.

[0044] 4(a), the guide mechanism 70 includes a beam-shaped connecting member 71, and is provided to connect the columnar pulley holder 31 and the columnar pulley guide 22 near their upper portions. The guide mechanism 70 also includes first and second direction changing units 72, 73 around which the wire saw 10 is hung, and first and second guide pulleys 74, 75, which are installed on the connecting member 71. The first and second guide pulleys 74, 75 are pulleys that rotate in the vertical direction, and guide the wire saw 10 from the drive mechanism 20 to the other of the paired storage mechanisms 30, and from one of the paired storage mechanisms 30 to the drive mechanism 20, respectively.

[0045] The first and second direction changing units 72, 73 each include horizontal pulleys 721, 731 and vertical pulleys 722, 732. As shown in Fig. 2, the first direction changing unit 72 twists the wire saw 10 fed from the first rear support device 50a to one of the paired storage mechanisms 30. The second direction changing unit 73 twists the wire saw 10 fed from the other paired storage mechanism 30 to the first front support device 40a. In this embodiment, the vertical direction refers to the direction parallel to the web 201b of the main girder 201.

[0046] As described above, in the drive unit D, the pulley guide 22 and the pulley holder 31 are connected by the connecting member 71, and these form a frame F that resembles a pillar and a beam. Looking at Figure 4, it can be seen that the frame F is formed by the pulley guide 22, the two pulley holders 31, and the connecting member 71. In the cutting device 100, this frame F is installed on the support mechanism 80, and the support mechanism 80 supports the drive unit D.

[0047] ≪≪Support mechanism≫≫ As shown in Figure 4(b), the support mechanism 80 includes a drive support beam 81 on which the pulley guide 22 is installed, a storage support beam 82 on which the pulley holder 31 is installed, and a plurality of clamping fittings 83.

[0048] The drive support beam 81 is made up of two long members 81a that extend in a direction perpendicular to the bridge axis, perpendicular to the main girders 201, and are arranged in parallel with a gap between them. These are arranged so as to span adjacent main girders 201, with each end resting on the bottom flange 201a of the main girders 201. The storage support beam 82 is made up of a single long member that is arranged so as to span adjacent main girders 201 in parallel with the drive support beam 81, with each end resting on the bottom flange 201a of the main girder 201. The clamping fitting 83 can be a C-clamp or a vice, but a C-clamp is used in this embodiment.

[0049] <Installation structure between the support mechanism 80 and the lower flange 201a of the main girder 201> As shown in Figure 4(b), both the drive support beam 81 and the storage support beam 82 are clamped together with the lower flange 201a of the main girder 201 by clamping fittings 83, and are fastened and fixed in place so as to be easily attached and detached. Note that the means for fastening the drive support beam 81 and the storage support beam 82 to the lower flange 201a of the main girder 201 is not limited to clamping fittings 83, and any means other than fastening may be used as long as it has a structure that allows for detachable installation.

[0050] Furthermore, H-shaped aluminum steel is used for the long member 81a that constitutes the drive support beam 81 and the storage support beam 82, but any member that can support the drive unit D may be used, and other long steel members with different cross-sectional shapes or materials other than steel may also be used.

[0051] <<Installation structure of support mechanism 80 and drive unit D>> 4(a), in the support mechanism 80 having the above-described configuration, the pulley guide 22 is installed on the drive support beam 81 via a clamping member 91. In addition, the pulley holder 31 is installed on the storage support beam 82 via a clamping metal fitting 95.

[0052] The clamping member 91 includes a through bolt 92, a through bolt fixing device 93 fixed to one end of the through bolt 92, and a support frame 94 having a through hole (not shown) through which the through bolt 92 passes. A support plate 221 of the pulley guide 22 is installed on the support frame 94, and this support plate 221 also has a through hole (not shown) through which the through bolt 92 passes.

[0053] These are arranged so that the through-bolt fixing device 93 abuts against the lower flange of the drive support beam 81. Furthermore, the support frame 94 is arranged so as to rest on the upper flange of the drive support beam 81. Then, the through-bolt 92 is arranged to pass through the drive support beam 81, the support frame 94, and the support plate 221. In this state, as shown in FIG. 4(b), the nut 92a provided on the through-bolt 92 is rotated, and the through-bolt fixing device 93 and the support frame 94 tighten and fix the drive support beam 81.

[0054] In this way, the pulley guide 22 constituting the frame F is detachably fastened to the drive support beam 81 via the clamping member 91. Although only one set of the combination of the through bolt 92, through bolt fixing device 93, and nut 92a may be provided for the support frame 94, here, as shown in Figures 1 and 4(a), two sets of these are provided with an interval between them and fastened at two points.

[0055] Meanwhile, clamping fixture 95 is similar to clamping fixture 83 constituting support mechanism 80, and a clamp, vice, or the like can be used, and Figures 4(a) and (b) show a C-clamp as an example. Clamping fixture 95 clamps between base portion 352 of jack base 35 provided on pulley holder 31 and storage support beam 82. As a result, pulley holder 31 constituting frame F is detachably fastened and fixed to storage support beam 82 via clamping fixture 95.

[0056] As described above, frame F is firmly installed on support mechanism 80 with a total of four fixing points: two fixing points are provided by through bolts 92 between pulley guide 22 and drive support beam 81, and two fixing points are provided by clamping brackets 95 between each of two pulley holders 31 and storage support beam 82. As a result, drive unit D is firmly installed and supported on support mechanism 80 in a stable state while being detachable from the support mechanism 80.

[0057] Note that as long as there are at least three fixing points, the drive unit D can be stably installed on the support mechanism 80. Therefore, for example, only one of the two pulley holders 31 may be fastened and fixed with the clamping fittings 95, and the other may be simply abutted by the base portion 352 of the jack base 35 against the upper surface of the storage support beam 82.

[0058] <<Method for assembling the cutting device and method for cutting and separating the concrete deck slab and main girder>> The procedure for assembling the cutting device 100 having the above-described configuration in the processing area and the procedure for forming the cut surface C on the haunch portion 204 by the cutting device 100 are as follows.

[0059] <Cutting device assembly work> First, as shown in Figures 4(a) and 4(b), the support mechanism 80 is installed on the lower flange 201a of the main girder 201. The support mechanism 80 has the drive support beam 81 positioned opposite the pulley guide 22 of the frame F, and the storage support beam 82 positioned opposite the pulley holder 31 of the frame F. Both ends of these are fastened and fixed to the lower flange 201a of the adjacent main girder 201 with clamping fittings 83.

[0060] Thereafter, the frame F provided for the drive unit D is placed on the support mechanism 80, and the drive unit D is supported on the support mechanism 80. That is, the drive support beam 81 is fastened and fixed to the pulley guide 22 via the clamping members 91. Also, the pulley holder 31 is fastened and fixed to the storage support beam 82 via the clamping metal fittings 95. The drive unit D is carried in with the drive mechanism 20, storage mechanism 30, and guide mechanism 70 pre-assembled and equipped with the frame F, and this frame F is installed on the support mechanism 80 as described above. Alternatively, the drive mechanism 20, storage mechanism 30, and guide mechanism 70 may be carried in separately and installed while being assembled on the support mechanism 80.

[0061] In this way, the drive unit D is supported on the support mechanism 80 in an upright position parallel to the web 201b of the main girder 201, as shown in Figure 1. In this way, there are no restrictions on the installation position of the drive unit D, allowing for a high degree of freedom, so the drive unit D can be installed while adjusting its position to ensure sufficient working space in the narrow area below the concrete slab 202. This makes it possible to improve the ease of construction of the entire work involved in cutting and separating the concrete slab 202 and the main girder 201.

[0062] Before, during, or at the same time as these operations, an insertion hole 205 for inserting the wire saw 10 is formed in the haunch portion 204 of the concrete slab 202, at the starting position for the horizontal cutting operation, as shown in Figure 1. In addition, a pair of traveling rails 60 are installed in predetermined positions on the underside of the concrete slab 202, suspended via anchor bolts (not shown). At the same time, first and second front support devices 40a, 40b and first and second rear support devices 50a, 50b are installed on the traveling rails 60, and the wire saw 10 is hung around them to assemble the cutting device 100 as shown in Figure 1.

[0063] <Cutting and separating work for the concrete deck and main girder> Once the cutting device 100 is assembled, the drive mechanism 20 is operated to apply a rotational force in the extension direction so that the wire saw 10, which has penetrated the haunch portion 204 in a direction perpendicular to the bridge axis, can travel in a circular motion. The wire saw 10 then travels horizontally on the first and second driven pulleys 41-42 provided on the first and second front support devices 40a, 40b and the first to third driven pulleys 51-53 provided on the first and second rear support devices 50a, 50b, and is fed into the drive unit D.

[0064] As shown in Fig. 4(a), the wire saw 10 in the drive unit D has its traveling direction changed from horizontal to vertical at the first direction change section 72, and then travels vertically on the first to third guide pulleys 32 to 34 of one of the paired storage mechanisms 30. Next, the wire saw 10 is fed into the drive mechanism 20 via the second guide pulley 75 of the guide mechanism 70. Then, the wire saw 10 travels vertically on the first to third guide pulleys 32 to 34 of the storage mechanism 30 via the drive pulley 21 and the first guide pulley 74 of the guide mechanism 70.

[0065] Then, the traveling direction of the wire saw 10 is changed from vertical to horizontal at the second direction change section 73, and then the wire saw 10 is paid out to the first and second driven pulleys 41-42 provided on the first and second front support devices 40a, 40b. After this, tension is applied to the wire saw 10 traveling in a circular motion to an extent that a cutting surface C can be formed in the haunch portion 204. The tension can be adjusted by moving the drive pulley 21 along the pulley guide 22.

[0066] At the same time, with the first and second rear support devices 50a, 50b stopped, the first and second front support devices 40a, 40b are moved along the traveling rails 60 in a direction away from them. Then, the wire saw 10 located between the first and second front support devices 40a, 40b is pressed against the planned height of the cutting surface C in the haunch portion 204. As a result, as shown in Fig. 2, the wire saw 10 travels in a circle in the extension direction, and moves in the bridge axis direction along the main girder 201 while being pressed against the planned position of the cutting surface C.

[0067] At this time, as shown in Figure 3(b), as the wire saw 10 moves in the bridge axis direction along the main girder 201, the drive pulley 21 is moved along the pulley guide 22. As a result, the wire saw 10 is sent out from the drive unit D, so the wire saw 10 always maintains tension that allows it to form the cut surface C. This allows the wire saw 10 to form the cut surface C in the haunch portion 204 by the push-cutting method.

[0068] 3(b), when the drive pulley 21 has moved to the upper end of the pulley guide 22, the drive pulley 21 is moved to the lower end along the pulley guide 22 while the excess length of the wire saw 10 is paid out from the pair of storage mechanisms 30. This operation is repeated to form a cutting surface C in the haunch portion 204.

[0069] When all the excess length of the wire saw 10 stored in the storage mechanism 30 has been unwound, the work of forming the cut surface C is stopped. After this, if the work of forming the cut surface C is to be continued, the cutting device 100 is moved to the next installation position. Also, if the work of forming the cut surface C is to be completed, the cutting device 100 is removed.

[0070] <Cutting device relocation work> When relocating the cutting device 100, the clamping members 91 and clamping fittings 95 are removed from the frame F of the drive unit D, and the clamped fastening is released. Next, the clamping fittings 83 of the support mechanism 80 are removed, and the fastening between the drive support beam 81 and the storage support beam 82 and the lower flange 201a of the main girder 201 is released. After this, at the destination, as in the installation described above, the drive support beam 81 and the storage support beam 82 are placed on the lower flange 201a of the main girder 201, and are clamped together with the lower flange 201a of the main girder 201 by the clamping fittings 83.

[0071] Next, the drive unit D is moved in its assembled state to the relocation destination, and the pulley guide 22 is fastened and fixed via clamping members 91 to the drive support beam 81 of the support mechanism 80 that was previously installed at the relocation destination. In addition, the pulley holder 31 is fastened and fixed via clamping fittings 95 to the storage support beam 82. In this way, it becomes possible to relocate the frame F in an assembled state, that is, the entire drive unit D, and it is also possible to shorten the overall construction period for cutting and separating the concrete deck slab 202 and the main girder 201. Note that these relocation operations may be performed by temporarily disassembling the drive unit D and then reassembling it on the support mechanism 80 installed at the relocation destination.

[0072] In this way, by performing the steps of installing the support mechanism 80 on the lower flange 201a of the main girder 201, installing a frame F equipped with the drive unit D on the support mechanism 80, and supporting the drive unit D on the support mechanism 80, the drive unit D can be installed below the concrete slab 202.Therefore, it is possible to improve the efficiency of the work involved in installing and relocating the entire cutting device 100, including the drive unit D, which is carried out under the concrete slab 202.

[0073] <<When a horizontal brace is connected to the lower flange 201a of the main girder 201>> The support mechanism 80, which is provided to span the lower flanges 201a of the adjacent main girders 201, may be installed on the cross beam 205. As shown in Figure 5, the cross beam 205 is a member that spans the adjacent main girders 201 via gusset plates 206 so as to be oblique to the bridge axis direction. The gusset plates 206 are fixed to the webs 201b by welding in an orientation parallel to the lower flanges 201a, and are members that are used to connect not only the cross beam 205 but also the diagonal beam 203 and the main girders 201.

[0074] Therefore, for example, the storage support beam 82 may be fastened to the cross beam 205 via clamping fittings 83, and the drive support beam 81 may be fastened to the lower flange 201a of the main girder 201 or the gusset plate 206 via clamping fittings 83. Alternatively, at least one of the storage support beam 82 and the drive support beam 81 may be fastened to the cross beam 205 via clamping fittings 83. If an angle iron is used for the cross beam 205, a backing material or the like may be inserted between the drive support beam 81 and the storage support beam 82 and the cross beam 205 when they are fastened to each other via clamping fittings 83.

[0075] <<Other examples of support mechanisms>> In the above support mechanism 80, the drive support beam 81 and the storage support beam 82 are fastened to the lower flange 201a of the main girder 201 via clamping fittings 83, but the fixing means is not limited to clamping fittings 83, and any means that can be installed freely and detachably, such as a magnet, may be used.

[0076] Furthermore, there are no restrictions on the installation position or shape of the drive support beams 81 and storage support beams 82, as long as they are able to support the drive unit D below the concrete floor slab 202. Furthermore, instead of having the drive support beams 81 and storage support beams 82 as separate bodies, a combined support beam 84 that combines the functions of both may be used. Other examples of the support mechanism 80 are shown below.

[0077] <<Example of Installing the Support Mechanism 80 on the Web 201b of the Main Girder 201>> As shown in Figures 6 and 7, the support mechanism 80 includes a drive support beam 81, a storage support beam 82, a plurality of magnet members 85, and a reinforcing member 86 that reinforces the drive support beam 81 and the storage support beam 82.

[0078] The drive support beam 81 is composed of a pair of elongated members 81a, with its tip extending laterally from the web 201b of the main girder 201 and its base end attached to the web 201b of the main girder 201 via a magnet member 85. As the drive support beam 81 is configured like a cantilever beam, a reinforcing member 86 is provided on the upper surface side of the base end. The reinforcing member 86 is composed of a vertical member 861 standing upright from the upper surface near the base end of the drive support beam 81, and a diagonal member 862 connecting the upper end of the vertical member 861 to the longitudinal middle part of the drive support beam 81.

[0079] The storage support beam 82 is composed of a pair of elongated members 82b, and similar to the drive support beam 81, its tip extends laterally from the web 201b of the main girder 201, and its base end is attached to the web 201b of the main girder 201, forming a cantilever beam. Therefore, similar to the drive support beam 81, a reinforcing member is provided on the upper surface side of the base end, although this is not shown in the figures.

[0080] <<Installation structure of support mechanism 80 and drive unit D>> In the support mechanism 80 configured as described above, the pulley guide 22 is installed on the drive support beam 81 via the clamping member 91 described above. Also, the pulley holder 31 is installed on the storage support beam 82 via the clamping metal fitting 95 described above. In this way, the drive unit D is firmly installed on the support mechanism 80.

[0081] 6, angle-shaped aluminum steel is used for the pair of elongated members 81a constituting the drive support beam 81 and the pair of elongated members 82a constituting the storage support beam 82. However, as long as the member can support the drive unit D, it does not necessarily have to be made of steel, and any material having any cross-sectional shape may be used.

[0082] <<Example of Installing the Support Mechanism 80 on the Vertical Stiffening Member 201d of the Main Girder 201>> As shown in Figures 8 and 9, the support mechanism 80 comprises a dual-purpose support beam 84 that combines the functions of both the drive support beam 81 and the storage support beam 82, a clamping bracket 83, and multiple brackets 87.

[0083] As shown in Figure 8, the bracket 87 is a cantilever-shaped member with its tip extending laterally from the web 201b of the main girder 201, and its base end is detachably attached to the vertical stiffening member 201d of the main girder 201 via a clamping fixture 83. A plurality of such brackets 87 are installed on each of the vertical stiffening members 201d adjacent to each other in the bridge axis direction, and Figure 9 shows an example in which brackets 87 are installed on four adjacent vertical stiffening members 201d.

[0084] A dual-purpose support beam 84 is installed to span these four vertical stiffening members 201d. As shown in FIG. 8, the dual-purpose support beam 84 is formed by arranging a pair of long members 84a in parallel with a gap between them, extending in the bridge axis direction parallel to the main girder 201. As shown in FIG. 9, the dual-purpose support beam 84 is placed on the upper surfaces of the above-mentioned multiple brackets 87 and is detachably installed via clamping fittings 83. Note that the pair of long members 84a that make up the dual-purpose support beam 84 are made of channel-shaped aluminum steel. However, as long as the member can support the drive unit D, it does not necessarily have to be made of steel, and any material with any cross-sectional shape may be used.

[0085] <Support mechanism and drive unit D installation structure> 9, in the support mechanism 80 having the above-described configuration, the dual-purpose support beam 84 is disposed below the pulley guide 22 and the pulley holder 31 that constitute the frame F provided in the drive unit D. Therefore, the pulley guide 22 is mounted on the dual-purpose support beam 84 via the clamping member 91 described above, and the pulley holder 31 is mounted on the dual-purpose support beam 84 via the clamping metal fittings 95 described above. In this way, the drive unit D is firmly mounted on the support mechanism 80.

[0086] In this case as well, the pulley guide 22 is fastened and fixed at two points to the dual-purpose support beam 84. Specifically, as shown in Fig. 9, two sets of combinations of through-bolt 92, through-bolt fixing device 93, and nut 92a that constitute clamping member 91 are installed on either side of the pulley guide 22.

[0087] <<Example of installing the support mechanism 80 on the counter-tilt structure 203 or crossbeam>> 10 and 11, the support mechanism 80 includes a dual-purpose support beam 84 that combines the functions of both the drive support beam 81 and the storage support beam 82, and a clamping bracket 83. The support mechanism 80 is installed so as to span adjacent counter-tilt structures 203, adjacent cross beams, or adjacent counter-tilt structures 203 and cross beams.

[0088] The counter-tilt structure 203 is a frame-shaped member that combines vertical members, horizontal members, and diagonal members, and the cross beam is a member made of a flexible steel material such as an I-beam. Both are members that are arranged with a gap between them and the concrete deck slab 202 and at a distance in the bridge axis direction, and the support mechanism 80 is installed using this gap. Details will be explained below using an example where the support mechanism is installed on adjacent counter-tilt structures 203.

[0089] As shown in Figure 10, the dual-purpose support beam 84 is formed by arranging a pair of long members 84a in parallel with a gap between them, extending in the bridge axis direction parallel to the main girder 201. As shown in Figure 11, these are placed on the top surfaces of adjacent counter-tilt structures 203 so as to span them, and are detachably installed via clamping fixtures 83. The pair of long members 84a that make up the dual-purpose support beam 84 are made of H-shaped aluminum steel. However, as long as they are capable of supporting the drive unit D, they do not necessarily have to be made of steel, and any material with any cross-sectional shape may be used.

[0090] <Support mechanism and drive unit D installation structure> 11, in the support mechanism 80 having the above-described configuration, the dual-purpose support beam 84 is disposed straddling above the pulley guide 22 and pulley holder 31 that constitute the frame F provided in the drive unit D. For this reason, the pulley guide 22 is mounted on the dual-purpose support beam 84 via the clamping member 91 described above, and the pulley holder 31 is mounted on the dual-purpose support beam 84 via the clamping metal fittings 95 described above.

[0091] 10 , clamping member 91 abuts through-bolt fixing device 93 against the upper surface of the lower flange of dual-purpose support beam 84, and also abuts support frame 94 against the lower surface of the lower flange of dual-purpose support beam 84, causing through-bolt 92 to pass through a bolt hole (not shown) of support frame 94 and dual-purpose support beam 84. In this state, nut 92a provided on through-bolt 92 is rotated, and the lower flange of dual-purpose support beam 84 is clamped between through-bolt fixing device 93 and support frame 94, whereby pulley guide 22 attached to support frame 94 is suspended and fixed to dual-purpose support beam 84.

[0092] 11, pulley holder 31 is clamped and fixed to dual-purpose support beam 84 via clamping metal fittings 95 (not shown). Any clamping and fixing method may be used, but for example, by attaching a support plate or the like that protrudes horizontally to the upper end of pulley holder 31 and clamping this and the lower flange of dual-purpose support beam 84 with clamping metal fittings 95, pulley holder 31 can be easily suspended and fixed to dual-purpose support beam 84.

[0093] In this case as well, the pulley guide 22 is fastened and fixed to the dual-purpose support beam 84 at two points. Specifically, as shown in Figure 11, two sets of combinations of through-bolt 92, through-bolt fixing device 93, and nut 92a that make up clamping member 91 are installed on either side of the pulley guide 22. In this way, the drive unit D is firmly installed on the support mechanism 80.

[0094] The deck cutting and separation system and the method for cutting and separating a concrete deck and a main girder of the present invention are not limited to the above-described embodiments, and various modifications are possible within the scope of the spirit of the present invention.

[0095] For example, in this embodiment, the drive unit D is provided with a storage mechanism 30 on each side of the drive mechanism 20 in the bridge axis direction, but this is not necessarily limited to this. The number of storage mechanisms 30 can be increased or decreased as appropriate depending on the length of the excess length of the wire saw 10. For example, Figure 12(a) shows an example in which the excess length is short and only one storage mechanism 30 is provided.

[0096] 12(b), the drive unit D is fixed at three points in total: two fixed points by through bolts 92 between the pulley guide 22 and the drive support beam 81, and one fixed point by clamping metal fitting 95 between the pulley holder 31 and the storage support beam 82. Therefore, the drive unit D can be stably installed on the support mechanism 80.

[0097] 12(a) and 13, the storage mechanism 30 may be provided on the front side of the drive mechanism 20 in the traveling direction of the wire saw 10. This suppresses chatter vibrations that continuously occur between the position of the haunch portion 204 where the wire saw 10 is pressed and the drive mechanism 20, and can prevent damage to the wire saw 10, removal of the wire from the drive pulley 21, deterioration in the accuracy of the cut surface C, and the like.

[0098] In the present embodiment, the first and second front support devices 40a, 40b are moved in a direction away from the stopped first and second rear support devices 50a, 50b to form the cut surface C in the haunch portion 204 by the push-cutting method. However, the present invention is not limited to this.

[0099] It is also possible to stop the first and second front support devices 40a, 40b and move the first and second rear support devices 50a, 50b in a direction away from them, thereby making it possible to provide a cutting surface C in the haunch portion 204 with the wire saw 10 between the first and second rear support devices 50a, 50b.

[0100] Furthermore, by fixing the first and second rear support devices 50a, 50b, moving the drive pulley 21 along the pulley guide 22 in the direction of pulling the wire saw 10 into the drive unit D, and allowing the first and second front support devices 40a, 40b to freely follow the movement of the wire saw 10, it is also possible to form a cutting surface C in the haunch portion 204 by the pull-cutting method. [Explanation of symbols]

[0101] 100 cutting equipment 10 Wire Saw 20 Drive mechanism 21 Drive pulley 22 Pulley guide 23 Lifting device 24 Drive unit 30 Storage Mechanism 31 Pulley holder 32 First guide pulley 33 Second guide pulley 34 Third guide pulley 35 Jack base 351 Jack section 352 Base 40a First front support device (moving device) 40b Second front support device (moving device) 41~42 1st and 2nd driven pulleys 44 Feeder 45 Mobile 46 Pulley stand 50a First rear support device (moving device) 50b Second rear support device (moving device) 51~53 3rd~5th driven pulleys 54 Feeder 55 Mobile 56 Pulley stand 564 Feeder 60 Running rail 61 Guide part 62 Guide support 70 Guide mechanism 71 Connecting member 72 First Turning Point 721 Horizontal pulley 722 Vertical pulley 73 Second Turning Point 731 Horizontal pulley 732 Vertical Pulley 74 First guide pulley 75 Second guide pulley 80 Support mechanism 81 Drive support beam 82 Storage support beam 83 Clamping hardware 84 Dual-purpose support beam 85 Magnet components 86 Reinforcement member 861 Vertical members 862 Diagonal 87 Bracket 91 Clamping member 92 through bolt 92a Nut 93 Through-bolt fixing device 94 Support stand 95 Clamping fittings 200 Bridges 201 Main girder 2011 Headed Studs 201a Lower flange 201b Web 202c Upper flange 202d Vertical stiffening member 202 Concrete deck 203 Counter-tilting structure 204 Haunch part (joint part) 205 Horizontal 206 Gusset Plate C Cut surface D Drive Unit F Frame

Claims

1. A cutting device that cuts and separates a joint between a concrete deck and a main girder of a bridge, a wire saw for forming a cutting surface along the main girder at the joint; a driven pulley that guides the wire saw in a direction along the cutting surface; a support mechanism detachably installed on the main girder; a drive unit supported by the support mechanism and causing the wire saw to travel in a circular motion; Including, A cutting device characterized in that the drive unit includes a pulley guide in an upright position that guides the raising and lowering of a drive pulley, and the support mechanism includes a drive support beam that supports the pulley guide.

2. 2. The cutting device according to claim 1, A cutting device characterized in that the support mechanism is installed on the lower flange of the main girder or on a cross beam connected to the main girder.

3. 2. The cutting device according to claim 1, A cutting device characterized in that the support mechanism is installed on the web of the main girder.

4. 2. The cutting device according to claim 1, A cutting device characterized in that the support mechanism is installed on a vertical stiffening member of the main girder.

5. A cutting device according to any one of claims 1 to 4, The drive unit is a drive mechanism including the drive pulley and the pulley guide; a storage mechanism including a guide pulley around which the excess length of the wire saw is wound; A cutting device characterized by comprising: a guide mechanism having a direction changing portion that changes the extension direction of the wire saw along the cutting surface.

6. In the cutting device described in claim 5, the drive unit includes a frame that is detachably mounted on the support mechanism; The frame is a columnar pulley guide provided in the drive mechanism and on which the drive pulley is installed; a columnar pulley holder provided in the storage mechanism and on which the guide pulley is installed; a beam-shaped connecting member provided in the guide mechanism, on which the direction changing portion is installed and which connects the pulley guide and the pulley holder; A cutting device characterized by comprising:

7. In the cutting device according to claim 6, The cutting device is characterized in that the frame is fixed to the support mechanism at at least three points.

8. A cutting device according to any one of claims 1 to 7, a moving device that moves along the main girder below the concrete deck, The cutting device is characterized in that the driven pulley is provided on the moving device.

9. A method for assembling a cutting device according to any one of claims 1 to 8, comprising: a step of installing the support mechanism on the main girder or the counter beam; installing the drive unit on the support mechanism; A method for assembling a cutting device, comprising:

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