Stud dowel cutting machine

Abstract

The present invention provides a stud dowel cutting machine that can efficiently cut stud dowels, which are installed on the upper flange of H-shaped steel bridge girders. [Solution] The cutting machine 11 consists of a cutting machine body 15 and a rail-equipped frame member 16. The cutting machine body includes a mounting base plate 18 that can move along the longitudinal direction of the flange 13, a side plate portion 19 provided on the mounting base plate, wheels 20 provided on the side plate portion, a drive motor provided on the mounting base plate, a drive roller 22, a driven roller 23, and a wire-shaped cutter 24 that rotates between the driven roller and the drive roller. The rail-equipped frame member includes a front frame portion 29 and a rear frame portion 30 attached to both sides of the flange, a rail frame portion 31 provided between the ends of the front frame portion and the rear frame portion, a rail 32 provided along the rail frame portion, and a traction means 33.

Description

Technical Field

[0001] The present invention relates to a cutter for a stud dowel that can cut the stud dowel provided on the upper flange of an H-shaped steel, which is a bridge girder, with good workability.

Background Art

[0002] As shown in FIG. 13, a concrete floor slab 1 of an elevated road or the like is integrally fixed with concrete 5 via a steel fixing stud dowel 4 provided on the upper part of a flange 3 of an H-shaped steel 2, which is a bridge girder. Reference numeral 7 in FIGS. 13 and 14 indicates asphalt provided on the upper part of the concrete 5.

[0003] The concrete floor slab 1 needs to be cut, removed, and rebuilt due to aging deterioration, damage, or the like caused by aging.

[0004] Conventionally, the work of cutting the concrete floor slab 1 is to vertically cut both sides (cutting lines 6) along the length direction of the H-shaped steel 2 using a concrete cutter or the like, remove the concrete floor slab portions 1a on both sides, and leave the remaining concrete floor slab portion 1b on the upper part of the H-shaped steel 2 as shown in FIG. 14.

[0005] Next, the concrete of the remaining concrete floor slab portion 1b is cut and removed using a concrete breaker or a sander or the like. Further, the stud dowel 4 on the upper part of the flange 3 is cut and removed using a gas burner or the like.

[0006] Note that Japanese Patent Laid-Open No. 9-111722 discloses a method for cutting a steel bridge girder in bridge reinforcement work and a cutting device used therefor (see Patent Document 1).

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

[0008] In conventional methods, cutting the stud dowel 4 with a gas burner or other open flame presents problems such as the scattering of sparks and dust, and the generation of smoke. Furthermore, there is a risk of deterioration and damage to the flange 3 of the H-beam 2 due to the heat.

[0009] Therefore, in the conventional example, there are challenges that must be addressed, namely preventing the scattering of sparks and dust and the generation of smoke, and preventing the flange 3 of the H-shaped steel 2 from deteriorating or being damaged by the heat of the fire. [Means for solving the problem]

[0010] The gist of the present invention, which solves the problems of the aforementioned conventional example, is a cutting machine for stud dowels provided on the upper flange of an H-shaped steel bridge girder, the cutting machine comprising a cutting machine body and a rail-equipped frame member fixedly attached to the flange, the cutting machine body comprising a mounting base that is movable along the longitudinal direction of the flange and has a cutting opening for passing the stud dowel, side plates provided on both sides of the mounting base, wheels provided on the side plates, a drive motor provided on the mounting base, and a drive rod provided on the mounting base that is driven in conjunction with the drive motor The rail-mounted frame member comprises a drive roller, at least one or a pair of driven rollers provided on the mounting base plate opposite to the drive roller, and a wire-shaped cutter that rotates between the driven roller and the drive roller, and the rail-mounted frame member comprises a front frame portion and a rear frame portion fixedly attached to both sides of the flange by fixing bolts and clamps, a rail frame portion provided between the ends of the front frame portion and the rear frame portion, a rail provided along the rail frame portion on which the wheels run, and a traction means provided on the front frame portion or the rear frame portion for traction of the mounting base plate along the longitudinal direction of the flange.

[0011] Furthermore, the front frame and the rear frame are each provided with a pair of elongated holes into which the fixing bolts are inserted and screwed into the clamp, and the clamp can be positioned along the side of the flange by moving the fixing bolts along the elongated holes; The front frame portion and the rear frame portion are provided with a center line for marking the center of the flange; The clamp has small bolts screwed into it to maintain a distance from the front frame or the rear frame that is the same as the thickness of the flange; The traction means comprises a retractable strip-shaped traction spring, a connecting portion that connects the tip of the strip-shaped traction spring to the mounting base plate, and a winding portion for winding up the strip-shaped traction spring; It includes. [Effects of the Invention]

[0012] According to the stud dowel cutting machine of the present invention, a wire-shaped cutter cuts the stud dowel horizontally, so unlike cutting with a gas burner flame, there is no scattering of sparks or dust, and no generation of smoke. Furthermore, the flame does not degrade or damage the flange of the H-beam. Furthermore, the frame member with rails is equipped with rails, and the wheels of the cutting machine body run on these rails. This guides the movement of the cutting machine body during cutting, ensuring accuracy and resulting in various excellent effects, such as reliable and smooth cutting.

[0013] The front and rear frames are each provided with a pair of elongated holes into which fixing bolts are inserted. These fixing bolts are screwed into clamps, and by moving the fixing bolts along the elongated holes, the clamps can be positioned to conform to the sides of the flanges. This configuration allows the front and rear frames to fit snugly against the flanges. Therefore, it offers the excellent advantage of allowing the rail-equipped frame member to be stably mounted while fixed to the flange.

[0014] The front frame part and the rear frame part are provided with center lines for marks that coincide with the center of the flange, so that when attaching the framed member with rails to the flange, it is easy to align the center line with the center of the flange. Therefore, it has an excellent effect that the framed member with rails can be accurately attached to a predetermined position of the flange.

[0015] The clamp is screwed with small bolts for maintaining the same distance as the thickness of the flange from the front frame part or the rear frame part. When the fixing bolt is tightened and one end of the clamp is crimped to the flange, due to the presence of the small bolts, the other end of the clamp is maintained at the same distance as the thickness of the flange from the front frame part or the rear frame part. That is, when the fixing bolt is tightened and one end of the clamp is crimped to the flange, due to the presence of the small bolts, the other end of the clamp does not lift upward, so it has an excellent effect that no distortion occurs in the clamp.

[0016] The traction means comprises a winding type belt traction spring, a connecting part for connecting the tip of the belt traction spring to the mounting substrate, and a winding part for winding the belt traction spring. In particular, since the traction spring is formed in a belt shape with a required width, it can be stably wound, and it has an excellent effect that the mounting substrate can be stably tractioned along the longitudinal direction of the flange.

Brief Description of the Drawings

[0017] [Figure 1] It is a perspective view of a stud dibel cutting machine according to the present invention. [Figure 2] It is a front view of a stud dibel cutting machine according to the present invention. [Figure 3] It is a plan view of a stud dibel cutting machine according to the present invention. [Figure 4] It is a front view of the cutting machine body. [Figure 5] It is a rear view of the cutting machine body. <00000{88}> [Figure 6] It is a plan view of the cutting machine body. [Figure 7] It is a right side view of the cutting machine body. [Figure 8] It is a plan view of the frame member with rails. [Figure 9] It is a front view of the frame member with rails. [Figure 10] It is a front view showing the separation of the cutting machine body and the frame member with rails. [Figure 11] It is a plan view of the cutting machine according to the present invention during the cutting of the stud dibel. [Figure 12] It is a plan view of the cutting machine according to the present invention after the cutting of the stud dibel is completed. [Figure 13] Regarding the description of the conventional example, it is a perspective view of a bridge showing the concrete floor slab broken. [Figure 14] Regarding the description of the conventional example, it is a front view showing the remaining concrete floor slab part broken.

Embodiments for Carrying out the Invention

[0018] Next, embodiments of the present invention will be described with reference to the drawings. The cutting machine 11 for the stud dibel of the present invention is a cutting machine for cutting the stud dibel 14 provided on the upper flange 13 of the H-shaped steel 12 which is a bridge girder. The cutting machine 11 for the stud dibel 14 is composed of a cutting machine body 15 and a frame member with rails 16 which is fixedly attached to the flange 13, as shown in FIGS. 1 to 3 and FIG. 10. Note that although the stud dibel 14 represents a horseshoe-shaped stud dibel in each figure, it includes stud dibels made of steel and having various shapes for fixing.

[0019] FIG. 1 is a perspective view of the cutting machine 11 for the stud dibel, FIG. 2 is a front view of the cutting machine 11 for the stud dibel, and FIG. 10 is a front view showing the separation of the cutting machine body 15 and the frame member with rails 16, and all show the state of being attached to the flange 13. FIG. 3 is a plan view of the cutting machine 11 for the stud dibel.

[0020] As shown in Figures 4 to 7, the cutting machine body 15 consists of a mounting base plate 18 that is movable along the longitudinal direction of the flange 13 (see arrow B in Figures 1, 8, 11, and 12) and has a cutting opening 25 for passing through the stud dowel 14, side plate portions 19 provided on both sides of the mounting base plate 18, wheels 20 provided on the side plate portions 19, a drive motor 21 provided on the mounting base plate 18, a drive roller 22 provided on the mounting base plate 18 and driven in conjunction with the drive motor 21, at least one or a pair of driven rollers 23 provided on the mounting base plate 18 opposite the drive roller 22, and a wire-shaped cutter 24 that rotates between the driven roller 23 and the drive roller 22.

[0021] The mounting base plate 18 is formed in the shape of a plate of the required size, and a cutting opening 25 is formed in the center of it, as shown in Figures 4 and 5. This cutting opening 25 is an opening for the stud dowel 14 to pass through.

[0022] The cutting opening 25 has vertically formed edges 25a. The spacing between the edges 25a is the required spacing to allow the stud dowel 14 to pass through. In other words, it is a spacing that corresponds to the width of the stud dowel 14 to be cut.

[0023] As shown in Figures 6 and 7, the side plate portion 19 is formed in a horizontally elongated plate shape and is provided on both sides of the mounting base plate 18. Furthermore, as shown in Figures 4 to 7, a pair of wheels 20 are rotatably mounted on the inside of the side plate portion 19. The wheels 20 also include rotating rollers or bearings. Reference numeral 19a in Figures 2 to 7 indicates a fixing bolt for attaching the side plate portion 19 to the mounting base plate 18.

[0024] The drive motor 21 is mounted on the mounting board 18, and is driven and stopped by an ON / OFF switch 21a.

[0025] The drive roller 22 is designed to be driven in conjunction with the drive motor 21 and is mounted on the mounting base plate 18. The drive roller 22 is made of a pulley that is larger in diameter than the driven roller 23, and a wire-shaped cutter 24 is wrapped around it to transmit power to the driven roller 23.

[0026] A pair of driven rollers 23 are provided on the mounting base plate 18 opposite the drive rollers 22. In other words, the driven rollers 23 consist of a pair of pulleys attached to the mounting base plate 18, and the driven rollers 23 and drive rollers 22 are arranged so that the cutter 24 is perpendicular to the stud dowel 14. Furthermore, the number of driven rollers 23 installed is not limited to one pair; there may be one or more.

[0027] The wire cutter 24 is a wire-type rotary cutter, such as a wire saw or band saw, and is wrapped around a drive roller 22 and two driven rollers 23, rotating at high speed.

[0028] In Figures 3 and 5, reference numeral 26a indicates a cutting fluid tank, reference numeral 26b indicates a cock, and reference numeral 26c indicates a fluid supply hose. When cutting the stud dowel 14 with the cutting machine 11, smooth cutting can be achieved by manually opening the cock 26b and supplying the cutting fluid from the cutting fluid tank 26a to the cutter 24. Furthermore, reference numeral 27a indicates a fixing nut provided on the mounting base plate 18, and reference numeral 27b indicates a tension bolt. Reference numeral 28 indicates a spring hanging shaft.

[0029] As shown in Figures 1, 8, and 9, the rail-equipped frame member 16 consists of a front frame portion 29 and a rear frame portion 30 fixedly attached to both sides 13a of the flange 13, a rail frame portion 31 provided between both ends of the front frame portion 29 and the rear frame portion 30, a rail 32 provided along the rail frame portion 31, and a traction means (tractor) 33 provided on the front frame portion 29 or the rear frame portion 30. Figure 8 is a plan view of the rail-equipped frame member 16, and Figure 9 is a front view of the rail-equipped frame member 16, both showing the state in which it is attached to the flange 13.

[0030] The front frame portion 29 and the rear frame portion 30 are formed from metal material into long, flat plates and are arranged in front of and behind the rail-equipped frame member 16. Furthermore, the front frame portion 29 and the rear frame portion 30 can be fixedly attached to both sides 13a of the flange 13 using fixing bolts 34 and clamps 35. Specifically, as shown in Figure 8, the front frame portion 29 and the rear frame portion 30 are each provided with a pair of elongated holes 36, 36. As shown in Figures 8 and 9, fixing bolts 34 are inserted into the elongated holes 36, and the fixing bolts 34 are screwed into the clamp 35. With this configuration, the clamp 35 can be positioned along the side 13a of the flange 13 by moving the fixing bolt 34 along the elongated hole 36 (see arrow A in Figures 8 and 9). Therefore, when the fixing bolt 34 is tightened, the rail-equipped frame member 16 can be stably attached to the flange 13 in a fixed state.

[0031] As shown in Figure 9, small bolts 37 are screwed into the clamp 35 to maintain a distance equal to the thickness of the flange 13 from the front frame portion 29 or the rear frame portion 30. Therefore, when the fixing bolt 34 is tightened and the clamp 35 rises, with one end 35a pressed against the flange 13, the presence of the small bolt 37 keeps the other end 35b of the clamp 35 at the same distance from the front frame portion 29 or the rear frame portion 30 as the thickness of the flange 13. In other words, when the fixing bolt 34 is tightened and the clamp 35 rises, causing one end 35a to press against the flange 13, the presence of the small bolt 37 prevents the other end 35b of the clamp 35 from lifting upward, thus preventing distortion of the clamp 35.

[0032] The front frame portion 29 and the rear frame portion 30 are provided with a center line 38 as a marker to align with the center 13b of the flange 13 (see Figure 8). Therefore, when attaching the rail-equipped frame member 16 to the flange 13, it is easy to align the center line 38 with the center 13b of the flange 13, and the rail-equipped frame member 16 can be accurately attached to the predetermined position (center position) of the flange 13. In this way, by accurately attaching the rail-equipped frame member 16, the cutting machine body 15 can be set in the correct position, and as a result, the cutting opening 25 of the mounting base plate 18 can pass through the stud dowel 14 properly. Note that the center 13b of the flange 13 shown in Figure 8 is determined by the worker measuring and marking the line on-site.

[0033] As shown in Figures 1, 8, and 9, the rail frame portion 31 is formed from a metal material in the shape of a long, flat plate and is provided between the ends of the front frame portion 29 and the rear frame portion 30. Then, the rail frame portion 31, the front frame portion 29, and the rear frame portion 30 form a rectangular frame body. In Figure 8, reference numeral 39 indicates a stopper pin provided on the rail frame portion 31, which maintains the mounting base plate 18 in a fixed state.

[0034] As shown in Figures 1, 8, and 9, the rail 32 is formed from a metal material into a long, flat plate shape and is installed along the lower side of the rail frame 31. The rail 32 is the part on which the wheels 20 of the cutting machine body 15 run along its longitudinal direction.

[0035] As shown in Figures 8, 11, and 12, the traction means (tractor) 33 consists of a retractable strip-shaped traction spring 33a, a connecting part 33b that connects the tip of the strip-shaped traction spring 33a to the mounting base plate 18, and a winding part 33c for winding up the strip-shaped traction spring 33a. With a traction means (tractor) 33 configured in this way, in particular, since the traction spring 33a is formed in the shape of a strip of the required width, it can be retracted stably, and the mounting base plate 18 is pulled in a stable state along the longitudinal direction of the flange 13 (see arrow B).

[0036] Next, the procedure for cutting the stud dowel 14 using the stud dowel cutting machine 11 of the present invention will be described step by step. First, as shown in Figure 10, the frame member 16 with rails is attached to the flange 13. In this case, as shown in Figure 8, the center lines 38 of the front frame portion 29 and the rear frame portion 30 are aligned with the center line 13b drawn in advance on the flange 13, and the frame member 16 with rails is accurately set to the predetermined position (center position) on the flange 13. Then, the fixing bolts 34 of the front frame portion 29 and the rear frame portion 30 are moved along the elongated holes 36 to adjust the position of the clamp 35 so that it is aligned with the side portion 13a of the flange 13, and the fixing bolts 34 are tightened, thereby maintaining the rail-equipped frame member 16 in a fixed state on the flange 13. Furthermore, the wheels 20 of the cutting machine body 15 are placed on the rails 32, and the cutting machine body 15 is set on the rail-equipped frame member 16 (see Figure 10). Next, the connecting portion 33b of the strip-shaped traction spring 33a is attached to the spring shaft 28, and then the stopper pin 39 is removed, and the mounting base plate 18 is moved toward the stud dowel 14 by the traction force of the traction means (tractor). Figure 11 shows the state in which the mounting board 18 is moved in this manner, passing through the cutting opening 25 or the stud dowel 14, and the cutter 24 cuts the stud dowel 14 horizontally. Figure 12 shows the state after the cutting is complete.

[0037] As described above, the stud dowel cutting machine 11 uses a wire-shaped cutter 24 to cut the stud dowel 14 horizontally, so unlike cutting with a gas burner, there is no scattering of sparks or dust, and no generation of smoke. Furthermore, the heat does not degrade or damage the H-beam. Furthermore, rails 32 are provided on the rail-equipped frame member 16, and the wheels 20 of the cutting machine body 15 run on the rails 32. This guides the movement of the cutting machine body 15 during cutting, ensuring accuracy and resulting in reliable and smooth cutting. [Industrial applicability]

[0038] The stud dowels 14 provided on the flange 13 of the H-shaped steel beam 12 refer to a general term for anchoring anchors used to secure the concrete floor slab, and include not only the horseshoe-shaped stud dowels 14 shown in each figure, but also various shapes of metal anchoring protrusions such as reinforcing bars, nails, fasteners, square steel bars, steel rods, bolts, and shear stoppers. [Explanation of symbols]

[0039] 1. Concrete slab 1a Concrete slab sections on both sides 1b Remaining concrete slab section 2 H-shaped steel 3 flanges 4 Stud dowels 5. Concrete 6 cutting line 7 Asphalt 11 Stud dowel cutting machine 12 H-beam 13 Flange 13a Side 13b Center 14 Stud dowels 15 Cutting machine body 16. Frame component with rails 18 Mounting board 19 Side plate part 19a Fixing bolts 20 wheels 21 Drive motor 21a ON / OFF switch 22 drive rollers 23 Driven roller 24 cutters 25 Cutting opening 25a Edge 26a Tank for cutting fluid 26b Cock 26c fluid supply hose 27a Fixing nut 27b Tension bolt 28 Spring-loaded hanging scroll 29 Front frame section 30 Rear frame section 31 Rail frame section 32 rails 33 Traction means (traction device) 33a Retractable strip-type traction spring 33b Connection part 33c Winding section 34 Fixing bolts 35 Clamp 35a One end 35b Other end 36 long hole 37 Small bolts 38 Center Line 39 Stopper pin

Claims

1. A cutting machine for stud dowels installed on the upper flange of an H-shaped steel bridge girder, The cutting machine consists of a cutting machine body and a frame member with rails that is fixedly attached to the flange. The cutting machine body is A mounting base plate that is movable along the longitudinal direction of the flange and has a cut opening for passing through the stud dowel, Side plate portions provided on both sides of the mounting substrate, The wheels provided on the side plate, A drive motor provided on the mounting board, The drive roller is driven in conjunction with the drive motor and is provided on the mounting board, A driven roller is provided on the mounting substrate opposite to the drive roller, and at least one or a pair of driven rollers are provided. The system comprises a wire-shaped cutter that rotates between the driven roller and the drive roller, The aforementioned frame member with rails is The front frame and rear frame are fixedly attached to both sides of the flange by fixing bolts and clamps, A rail frame portion is provided extending between the ends of the front frame portion and the rear frame portion, A rail provided along the rail frame portion, on which the wheels run, The front frame portion or the rear frame portion is provided with a traction means for pulling the mounting substrate along the longitudinal direction of the flange. A stud dowel cutting machine featuring the following characteristics.

2. The front frame and the rear frame are each provided with a pair of elongated holes. The fixing bolt is inserted into the elongated hole. The fixing bolt is screwed into the clamp, The configuration allows the clamp to be positioned along the side of the flange by moving the fixing bolt along the elongated hole. A stud dowel cutting machine according to claim 1, characterized by the above.

3. The front frame portion and the rear frame portion are provided with a center line to serve as a marker to align with the center of the flange. A stud dowel cutting machine according to claim 1, characterized by the above.

4. The clamp is fitted with small bolts that maintain a distance from the front frame or rear frame that is the same as the thickness of the flange. A stud dowel cutting machine according to claim 1, characterized by the above.

5. The traction means comprises a retractable strip-shaped traction spring, a connecting portion that connects the tip of the strip-shaped traction spring to the mounting base plate, and a winding portion for winding up the strip-shaped traction spring. A stud dowel cutting machine according to claim 1, characterized by the above.

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