Cutting device for longitudinal ribs of bridge girders

Abstract

To provide a cutting device for vertical ribs of bridge girders and bridge collapse prevention blocks for cutting and removing welded parts of reinforcing vertical ribs welded to elevated bridge girder or the welded parts of bridge collapse prevention blocks welded near the joint parts of the bridge girders of freeways.SOLUTION: A cutting device 11 for vertical bridge girder ribs and the bridge collapse prevention blocks consists of a guide part 12 arranged along the length direction of vertical ribs 52 or along bridge collapse prevention blocks, a block joint 14 which is movable along a guide rail 13 of the guide part and holds a cutting machine 15 and a cutting machine with a cutting blade 16 for cutting welded parts.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a cutting device for vertical ribs of bridge girders and bridge fall prevention blocks, which is used to cut the welded portions of reinforcing vertical ribs welded to elevated bridge girders of expressways, etc., or the welded portions of bridge fall prevention blocks welded near the joints of the bridge girders. [Background technology]

[0002] 8 and 9, reinforcing vertical ribs (vertical reinforcement steel members) 53 are welded and fixed vertically to bridge girders 52 of an expressway 51. Because the load caused by running vehicles is transmitted to these vertical ribs 53 via the bridge girders 52, they are prone to aging deterioration such as cracks, and therefore must be appropriately cut and removed, replaced, etc.

[0003] 16, bridge fall prevention blocks 55 are welded to both sides of joint portion 54 of bridge girder 52, and wires 56 are hung between these two bridge fall prevention blocks 55 to prevent the bridge from falling in the event of an earthquake. These bridge fall prevention blocks 55 are prone to rust and other deterioration over time, so they must be cut and removed as necessary and replaced. Incidentally, reference numeral 58 in Figs. 8, 9 and 16 denotes an asphalt pavement.

[0004] The applicant conducted a search for prior art patents and utility models on the patent information platform for cutting devices for longitudinal ribs of bridge girders and bridge fall prevention blocks, using keywords such as "bridge girder," "longitudinal rib," "vertical steel member," "bridge fall prevention block," "cutting," "cutting machine," and "cutting device," as well as the IPC (International Patent Classification) numbers "E01D1 / 00," "E01D2 / 00," "E01D19 / 00," "E01D22 / 00," "E01D24 / 00," "B23D45 / 00," and "B23D55 / 00." However, no examples of applications or registrations for cutting devices for longitudinal ribs of bridge girders and bridge fall prevention blocks were found.

[0005] On the other hand, Patent Document 1 discloses a cutting device that cuts a fillet welded portion of a sole plate that is attached to the lower part of the bottom flange of a bridge girder by fillet welding. This cutting device has a pair of rail members provided on the top of a long plate-shaped holding plate, and a base is installed so as to be freely movable along the longitudinal direction of the rail members. A driving motor installed on the base is provided with a cutting blade disposed along the lower flange. In addition, a magnet is disposed so as to be attracted to the lower flange and is disposed extending upward from the holding plate. This cutting device attracts the magnet to the lower part of the lower flange, and then rotates and drives the cutting blade to cut the fillet welded portion of the sole plate. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2015-121072 A Summary of the Invention [Problem to be solved by the invention]

[0007] This conventional cutting device cuts the sole plate welded to the bottom of the bottom flange of the bridge girder, so it is difficult to apply it to the longitudinal ribs and bridge fall prevention blocks of the bridge girder, which are welded in different positions from the sole plate. In other words, it is difficult to place the conventional cutting device on the longitudinal ribs and bridge fall prevention blocks, making cutting difficult.

[0008] Therefore, the cutting device in the conventional example has a problem that must be solved in terms of accurately and efficiently cutting the welded portions of vertical ribs and bridge fall prevention blocks welded to highway bridge girders, while also cutting without damaging the bridge girders. [Means for solving the problem]

[0009] The gist of the present invention for solving the problems of the above-mentioned conventional example is to weld the welded portion of a long plate-shaped longitudinal rib welded along the vertical direction to an elevated bridge girder. Cutting device for cutting The cutting device is arranged in a length direction of the longitudinal rib. Arrange along The guide section is made up of a guide rail, a block joint that is movable along the guide rail of the guide section and holds a cutter, and the cutter is provided with a cutting blade for cutting the welded portion. The guide section is made up of a main body section of a required length, a long plate-shaped guide rail provided on the main body section, and a cutting blade provided at the base of a bending section that bends from both ends of the main body section. Holds the longitudinal rib The block joint has a block portion that can move while clamping the guide rail, a stopper portion that can be fastened and fixed to the guide rail, and a holding portion that holds the inserted cutting machine, and the cutting machine has the cutting blade, a motor that rotates the cutting blade, a switch that turns on and off the drive of the motor, and a cutting guide that covers the cutting blade in a U-shape. and an adjustment plate is provided on both sides of the holding part, the mounting position of which can be adjusted by tightening or loosening a plate bolt, the end of the adjustment plate has a protruding portion, and the cutting guide is provided with a locking rail that locks onto the protruding portion, and the locking rail is locked onto the protruding portion when the cutting tool is inserted into the holding part, thereby preventing the cutting position from shifting due to the cutting blade. It is.

[0010] The holding means further comprises: Clamp or magnet Being; The stopper portion is configured to be fastened to the guide rail to maintain a fixed state and suppress a reaction force generated by the rotation of the cutting blade; the cutting blade being a welding saw; It includes. Effect of the Invention

[0011] According to the cutting device for bridge girder vertical ribs and bridge fall prevention blocks of the present invention, when cutting a vertical rib, first, the vertical rib is clamped with the holding means (clamp) of the guide section and fixed with a clamp bolt, then the guide rail is clamped with the block section of the block joint and the stopper section is operated to fix it to the guide rail. Then, the mounting position of the adjustment plate is adjusted relative to the holding portion and fixed with a plate bolt, and the cutter is inserted into the holding portion while the locking rail of the cutting guide is locked onto the ridge portion of the adjustment plate. Furthermore, by turning on the cutter switch to drive the motor and pressing the cutting blade against the welded part of the vertical rib to cut it, the welded part of the vertical rib can be cut accurately without damaging the bridge girder. Also, since no sparks are produced, the work can be done safely, which is an excellent effect. Furthermore, when cutting the bridge fall prevention block, the guide section's holding means (magnet) is magnetically attached and fixed to the bridge girder, and the same procedure as above is followed, such as clamping the guide rail with the block section of the block joint. Then, by pressing the cutting blade against the welded part of the bridge fall prevention block and cutting it, the welded part of the bridge fall prevention block can be cut accurately without damaging the bridge girder. In addition, since no sparks are produced, the work can be carried out safely, which has various excellent effects.

[0012] The holding means is a clamp that clamps the vertical rib, or a magnet that is magnetically attached to the bridge girder, which has the excellent effect of allowing the vertical rib to be clamped with the clamp and firmly fixed with the clamp bolt when cutting the vertical rib, and allowing the magnet to be magnetically attached to the bridge girder and firmly fixed when cutting the bridge fall prevention block.

[0013] The stopper part is configured to suppress the reaction force generated by the rotation of the cutting blade by fastening it to the guide rail and maintaining it in a fixed state, so that the reaction force in the direction of rotation of the cutting blade or in the direction opposite to the direction of rotation can be suppressed when cutting the vertical ribs or bridge fall prevention blocks. In other words, the cutting blade does not wobble or shift, and the cutting position can always be accurately cut.

[0014] On both sides of the holding part, there are adjustment plates whose mounting positions can be adjusted by tightening or loosening the plate bolts, the ends of the adjustment plates have ridges, and the cutting guides are provided with locking rails that lock onto the ridges, and when the cutter is inserted into the holding part, the locking rails are locked onto the ridges to prevent the cutting position from shifting due to the cutting blade. This means that the mounting position of the adjustment plates relative to the holding part can be adjusted in advance, and then the cutter can be inserted into the holding part to start cutting, preventing the cutting blade from shifting. In other words, any cutting position can be cut accurately, and the phenomenon of the cutting blade floating up can be prevented, resulting in the excellent effect of not damaging the bridge girder.

[0015] Since the cutting blade is a welding saw, it is capable of cutting hard steel materials and the like, and has the excellent effect of being able to cut the welded parts of vertical ribs and bridge fall prevention blocks. [Brief description of the drawings]

[0016] [Figure 1] 1 is a front view of a cutting device for longitudinal ribs of bridge girders and bridge fall prevention blocks according to the present invention. FIG. [Diagram 2] 1 is a perspective view of a cutting device for a longitudinal rib of a bridge girder and a bridge fall prevention block according to the present invention. FIG. [Diagram 3] 1 is a perspective view of a guide portion with a vertical rib clamped by a clamp, and a block joint attached to the guide portion. FIG. [Figure 4] 1 is a perspective view of a guide portion with a vertical rib clamped by a clamp, and a block joint attached to the guide portion. FIG. [Diagram 5] FIG. [Figure 6] FIG. [Figure 7] 1A is an explanatory view showing the cutting guide and the holding part separated from each other, and FIG. 1B is an explanatory view showing the cutting guide and the holding part with the locking rail locked to the protruding portion. [Figure 8] FIG. 1 is a front view of a highway showing a longitudinal rib welded to a bridge girder and a cutting device of the present invention. [Figure 9]FIG. 1 is a front view of a highway showing a longitudinal rib welded to a bridge girder and a cutting device of the present invention. [Figure 10] FIG. 1 is a front view of a highway showing a longitudinal rib welded to a bridge girder and a cutting device of the present invention. [Figure 11] FIG. 1 is a front view of a highway showing a longitudinal rib welded to a bridge girder and a cutting device of the present invention. [Figure 12] 13 is a front view of a guide member with a clamp clamping a vertical rib. FIG. [Figure 13] 13 is a rear view of the guide member with a clamp clamping the vertical rib. FIG. [Figure 14] 13 is a side view of a guide member with a clamp clamping a vertical rib. FIG. [Figure 15] 1 is a side view of a guide member with a clamp holding a vertical rib and a cutting machine inserted into a main body. FIG. [Figure 16] FIG. 1 is a front view of a highway showing fall prevention blocks welded to a bridge girder. [Figure 17] FIG. 2 is a front view of a cutting device according to the present invention for cutting a fall prevention block. [Figure 18] FIG. 2 is a front view of a cutting device according to the present invention for cutting a fall prevention block. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Next, an embodiment of the present invention will be described with reference to the drawings. First, in Fig. 1 and Fig. 2, reference numeral 11 denotes a cutting device for a longitudinal rib of a bridge girder and a bridge fall prevention block, and this cutting device 11 is composed of a guide part 12 arranged along the length of the longitudinal rib 53 or along the bridge fall prevention block 55 (see Fig. 16), a block joint 14 movable along the guide rail 13 (see Fig. 1) of the guide part 12 and holding a cutting machine 15, and the cutting machine 15 equipped with a cutting blade 16 for cutting the welded part.

[0018] The cutting device 11 for bridge girder vertical ribs and bridge fall prevention blocks is a cutting device for cutting the welded portion 53a of a long plate-shaped vertical rib 53 welded vertically to an elevated bridge girder 52 of an expressway 51 or the like, or for cutting the welded portion 55a of a bridge fall prevention block 55 welded near a joint portion 54 of the bridge girder 52 (see Figures 8 to 11, 16 and 17).

[0019] As shown in Figures 2 to 4, the guide portion 12 has a main body portion 17 of a required length formed in a rectangular column shape, a long plate-shaped guide rail 13 (see Figure 1) provided along the inside of the main body portion 17, and a holding means (clamp 21 or magnet 22) provided at the base 19 of a bending portion 18 that bends from both ends of the main body portion 17 and holds the vertical rib 53 or bridge girder 52.

[0020] The bent portion 18 is formed in a thick plate shape separately from the main body portion 17, and the main body portion 17 and the bent portion 18 are integrally fixed together with a mounting bolt 20 (see Figs. 2 to 4). Note that the main body portion 17 and the bent portion 18 may be integrally formed without using the mounting bolt 20.

[0021] Specifically, the holding means is a clamp 21 (see Figs. 1 to 4) that clamps the vertical rib 53, or a magnet 22 that is magnetically attached to the bridge girder 52 (see Fig. 17). When cutting the vertical ribs 53, they are clamped by the clamps 21 and firmly fixed by the clamp bolts 23 (see Figs. 1 to 4). When cutting the bridge fall prevention blocks 55, the magnets 22 are magnetically attached to the bridge girder 52 and firmly fixed (see Fig. 17). The reference numeral 22a in Figs. 17 and 18 denotes a magnetic switch for activating or deactivating the magnetic force.

[0022] As shown in Figures 1 and 3, the block joint 14 has a block portion 24 that can clamp the guide rail 13 and move, a stopper portion 25 that can be tightened and fixed to the guide rail 13, and a holding portion 26 that holds the inserted cutting machine 15.

[0023] The block portion 24 has a groove-like portion (not shown) in the center, and is designed to be able to clamp the long plate-like guide rail 13 and move in the longitudinal direction (see FIG. 1).

[0024] By operating the rail stopper 27, the stopper portion 25 can be tightened to the guide rail 13 to maintain the block joint 14 in a fixed state. By keeping the block joint 14 fixed in this way, it is possible to suppress the reaction force generated by the rotation of the cutting blade 16. In other words, since the reaction force (see arrow A in FIG. 1) in the direction of rotation of the cutting blade 16 or the direction opposite to the direction of rotation can be suppressed when cutting the vertical rib 53 or the bridge fall prevention block 55, the cutting blade 16 can be prevented from shaking or shifting, and the cutting position can be accurately cut.

[0025] As shown in Figs. 1, 3 and 4, the holding portion 26 is formed in a U-shape, and surrounds and holds the inserted cutting device 15 (see Figs. 1 and 2). Further, plate-shaped adjustment plates 28 are provided on both sides of the holding portion 26, and protruding stripes 30 are provided along the ends of the adjustment plates 28 (see Figs. 2 to 4). The adjustment plate 28 has a plate bolt 29 attached to a long hole 40 (see Figures 2 to 4), and the attachment position can be adjusted by tightening or loosening the plate bolt 29, so that the convex portion 30 can be adjusted to any position. The protruding portion 30 engages with a locking rail 34 of a cutting guide 33, which will be described later.

[0026] As shown in Figures 5 and 6, the cutting machine 15 has a cutting blade 16, a motor 31 that rotates the cutting blade 16, a switch 32 that turns the motor 31 on and off, and a cutting guide 33 that covers the cutting blade 16 in a U-shape. In the figure, reference numeral 38 denotes a handle, and reference numeral 39 denotes a reduction gear box.

[0027] The cutting blade 16 is formed in a disk shape, and is specifically a welding saw for wood. Therefore, since it can cut hard steel materials, it is possible to cut the welded parts 53a, 55a of the vertical ribs 53 and the bridge fall prevention blocks 55.

[0028] 5 and 6, an L-shaped locking rail 34 is provided over a required length on both sides of the cutting guide 33. The locking rail 34 is a portion that locks the protruding portion 30 of the adjustment plate 28 when the cutting machine 15 is inserted into the holding portion 26.

[0029] The relationship between the protruding portion 30 of the adjustment plate 28 and the locking rail 34 of the cutting guide 33 will be described. The position of the ridge portion 30 of the adjustment plate 28 can be adjusted by adjusting the mounting position by tightening or loosening the plate bolt 29. In other words, when the cutter 15 is inserted into the holding portion 26, the position of the ridge portion 30 can be adjusted so that the cutting position of the cutting guide 33 and the series of cutting blades 16 is optimal. Therefore, by engaging the convex strip portion 30 with the engaging rail 34, the cutting guide 33 and the series of cutting blades 16 can cut at an optimal and arbitrary cutting position, and the phenomenon of the cutting blades floating up can be prevented, as a result, the bridge girder is not damaged.

[0030] Next, we will explain the procedure for using the cutting device 11 to cut the welded portion 53a (see Figure 1) of a long plate-shaped vertical rib 53 welded vertically to a bridge girder 52 of an expressway 51, as shown in Figures 8 and 9. First, the vertical rib 53 is clamped by the clamp 21 of the guide part 12 and fixed with the clamp bolt 23, then the guide rail 13 is clamped by the block part 24 of the block joint 14, and the rail stopper 27 is operated to fix the stopper part 25 to the guide rail 13. At this time, the block joint 14 is maintained in a fixed state. Then, the mounting position of the adjustment plate 28 is adjusted with respect to the holding portion 26, and fixed with the plate bolt 29. At this time, the position of the convex strip portion 30 is adjusted so that the cutting position of the cutting blade 16 is at an appropriate position. Next, the cutting machine 15 is inserted into the holding portion 26 , and the locking rail 34 of the cutting guide 33 is locked onto the protruding portion 30 of the adjustment plate 28 . Furthermore, the switch 32 of the cutting machine 15 is turned on to drive the motor 31, and the cutting blade 16 is pressed against the welded portion of the vertical rib 53 to cut it.

[0031] Once cutting of the cutting position is completed in this manner, the rail stopper 27 is operated to release the stopper portion 25 from the fixed state to the guide rail 13, and the block joint 14 is moved downward (or upward) approximately 5 to 20 cm along the length of the vertical rib 53. Then, the rail stopper 27 is operated to fix the stopper portion 25 to the guide rail 13 again, and the cutting blade 16 is pressed against the welded portion of the vertical rib 53 to cut it through the same procedure as described above.

[0032] This procedure is repeated several times, and when cutting along the length of the guide portion 12 is completed, the clamp bolt 23 is loosened to release the clamp 21 from its fixed state to the vertical rib 53, and the guide portion 12 is then moved downward (or upward) along the length of the vertical rib 53 to the next cutting section. Then, the guide portion 12 is set for the next cutting section, the rail stopper 27 is operated to fix the stopper portion 25 to the guide rail 13 again, and cutting is then performed by pressing the cutting blade 16 against the welded portion of the vertical rib 53 multiple times, following the same procedure as above.

[0033] After the longitudinal ribs 53 have been cut in this manner, uncut portions remain at the upper end 35 and the lower end 36 of the longitudinal ribs 53, as shown in Figs. When cutting this uncut portion, a clamp-equipped guide member 37 shown in Figs. 12 to 15 is used to perform the cutting.

[0034] 12 to 15, the clamp-equipped guide member 37 has a U-shaped main body 41 that holds the cutting machine 15 to be inserted, a clamp plate 42 that holds a vertical rib 53 between itself and one end of the main body 41, a clamp bolt 43 provided on the clamp plate 42, and a plate-shaped adjustment plate 44 provided on both sides of the main body 41, with a protruding rib portion 45 provided on an end of the adjustment plate 44. A plate bolt 47 is attached to an elongated hole 46 of the adjustment plate 44, and the mounting position can be adjusted by tightening or loosening the plate bolt 47, so that the protruding rib portion 45 can be adjusted to any position. The protruding portion 45 is a portion that engages with the engaging rail 34 of the cutting guide 33 .

[0035] The clamped guide member 37 having such a configuration is set on the upper end 35 (or lower end 36) of the vertical rib 53, the mounting position of the adjustment plate 44 is adjusted, the cutting machine 15 is inserted into the main body 41, and the locking rail 34 of the cutting guide 33 is locked onto the convex portion 45 of the adjustment plate 44. Furthermore, the switch 32 of the cutting machine 15 is turned on to drive the motor 31, and the cutting blade 16 is pressed against the welded portion of the vertical rib 53 to cut the uncut portions remaining at the upper end 35 and lower end 36 of the vertical rib 53. Furthermore, if any uncut portions remain, they are removed using a saber saw or a tipped saw.

[0036] By cutting the entire length of the vertical rib 53 according to the above procedure, the welded portion of the vertical rib 53 can be cut accurately without damaging the bridge girder 52. In addition, since no sparks are produced, the work can be performed safely.

[0037] Next, a procedure for using the cutting device 11 to cut the welded portion of the bridge collapse prevention block 55 welded near the joint portion 54 of the bridge girder 52 of the expressway 51 shown in FIG. 16 will be described. First, as shown in Figure 17, the magnet 22 of the guide portion 12 is magnetically attached and fixed to the bridge girder 52 by turning the magnet switch 22a on and off, and then the cutting blade 16 is pressed against the welded portion of the bridge fall prevention block 55 and cut it, following the same procedure as when cutting the vertical rib 53, such as clamping the guide rail 13 with the block portion 24 of the block joint 14.

[0038] In addition, if a cross rib 57 is present near the bridge fall prevention block 55, as shown in Figure 18, the cross rib 57 can be clamped with a clamp 21 instead of a magnet 22 and fixed with a clamp bolt 23, and then cutting can be performed using the same procedure as described above.

[0039] By cutting the welded parts of the bridge fall prevention block 55 in the above-mentioned procedure, any desired cutting position of the bridge fall prevention block 55 can be cut accurately without damaging the bridge girder. In addition, since no sparks are produced, the work can be done safely. [Industrial Applicability]

[0040] Furthermore, the cutting device 11 for cutting longitudinal ribs and bridge fall prevention blocks of bridge girders of the present invention can be applied to cut not only the longitudinal ribs 53 and bridge fall prevention blocks 55 but also the transverse ribs 57. [Explanation of symbols]

[0041] 11 Cutting device for bridge girder longitudinal ribs and bridge fall prevention blocks 12 Guide section 13 Guide rail 14 Block joint 15 Cutting machine 16 cutting blade 17 Main body 18 Bend section 19 Base 20 Mounting bolts 21 Clamp 22 Magnet 22a Magnetic switch 23 Clamp bolt 24 Block section 25 Stopper part 26 Holding part 27 Rail stopper 28 Adjustment Plate 29 Plate bolt 30 Convex stripe 31 Motor 32 Switch 33 Cutting Guide 34 Locking rail 35 Upper end 36 Lower end 37 Guide member with clamp 38 Handle 39 Reduction gear box 40 long hole 41 Main body 42 Clamp plate 43 Clamp bolt 44 Adjustment Plate 45 Convex strip 46 long hole 47 Plate bolt 51 Expressway 52 Bridge girder 53 Vertical rib (vertical reinforcement material) 53a Welded part 54 Joint part 55 Bridge fall prevention block 55a Welded part 56 Wire 57 Horizontal ribs 58 Asphalt pavement

Claims

1. A cutting device for cutting a welded portion of a long plate-shaped longitudinal rib welded along a vertical direction to an elevated bridge girder, The cutting device is composed of a guide section disposed along the longitudinal direction of the vertical rib, a block joint movable along the guide rail of the guide section and holding a cutting machine, and the cutting machine having a cutting blade for cutting the welded portion, The guide portion has a main body portion of a required length, the guide rail having a long plate shape provided on the main body portion, and a holding means provided at a base of a bent portion that is bent from both ends of the main body portion and holds the vertical rib, the block joint has a block portion that can move while clamping the guide rail, a stopper portion that can be fastened to the guide rail and fixed thereto, and a holding portion that holds the inserted cutting machine, The cutting machine includes the cutting blade, a motor for rotating the cutting blade, a switch for turning on and off the motor, and a cutting guide for covering the cutting blade in a U-shape, An adjustment plate is provided on both sides of the holding portion, and the mounting position of the adjustment plate can be adjusted by tightening or loosening the plate bolt. The end of the adjustment plate has a protruding portion. The cutting guide is provided with a locking rail that locks onto the protruding portion, The locking rail is locked to the protruding portion when the cutting tool is inserted into the holding portion, thereby preventing the cutting position of the cutting blade from shifting. A cutting device for longitudinal ribs of a bridge girder, comprising:

2. The holding means is a clamp or a magnet.

2. The cutting device for longitudinal ribs of a bridge girder according to claim 1 .

3. The stopper portion is fastened to the guide rail to maintain the guide rail in a fixed state, and is configured to suppress a reaction force generated by the rotation of the cutting blade.

2. The cutting device for longitudinal ribs of a bridge girder according to claim 1 .

4. The cutting blade is a welding saw.

2. The cutting device for longitudinal ribs of a bridge girder according to claim 1 .

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