JP2008137140A - Grinder holding device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a grinder holding device capable of being used in a space with narrow bridge beams and without support floor, and being easily carried. <P>SOLUTION: This device comprises a holding tool 12 holding a disc grinder 11, and an adapter 14 fixed and supported by a structure 4 around a ground article by a fixing part 16 and separably mounting the holding tool 12. The holding tool 12 has: a holder 22 fixing and holding the disc grinder 11 so that a grinding surface of a grinding disc 11a is directed upward; an arm 28 having a handle 26 on one end and fixed to the holder 22 on the other end; a moving part 24 guided and moved in a predetermined direction in parallel to a ground object surface 6 relative to the adapter 14; a shrinkage mechanism 30 interposed between the holder 22 and the moving part 24 and making the holder 22 parallel displacement in vertical direction to the moving part 24; and an inclination mechanism 34 inclining the holder 22 in vertical direction around an axial line perpendicular to the predetermined direction relative to the moving part 24. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a grinder holding device for holding a disc grinder having a grinding disc so that the grinding disc faces upward in order to grind the surface of an object to be ground upward from below.

2. Description of the Related Art Conventionally, a device disclosed in Patent Document 1 is known as a grinder holding device that holds a disc grinder upward and facilitates grinding of an object to be ground such as an overhead weld bead. This prior art has a tilting mechanism (variable tilting platform) to which a disc grinder is attached, a telescopic mechanism (jack) for raising and lowering the tilting mechanism, and a spring for pressing the grinding disc of the disc grinder against the workpiece. A moving part (slider) slides on a rail disposed on a carriage to grind an object to be ground.
Japanese Utility Model Sho 63-97448

  However, since the conventional grinder holding device has a large carriage, there is a problem that it cannot be used in a narrow space without a support floor such as in a bridge girder and cannot be carried and carried. .

  Furthermore, once the tilting angle of the tilting mechanism is set once, the grinding disk of the grinder is substantially always in contact with the workpiece at a constant angle, and is pressed against the workpiece with a constant pressing force by the spring. In addition, it is difficult to level the ground surface of the workpiece by reducing the angle with respect to the workpiece, and there is a problem that the grinding disc of the disc grinder is worn quickly.

  Therefore, the present invention can be used in a narrow space without a supporting floor such as in a bridge girder, and can be easily carried, and operability that can easily level the ground surface. An object of the present invention is to provide a grinder holding device.

  The present invention has been made to solve the above problems, and a grinder holding device according to the present invention includes a disc grinder having a grinding disc for grinding the surface to be ground of an object to be ground upward from below. A grinder holding device for holding a grinding surface of a grinding disk so as to face upward, a holding device for holding the disk grinder, and a fixed portion fixedly supported on a structure around the workpiece to be ground. And an adapter for detachably mounting the holding device, the holding device fixing the disk grinder so that the grinding surface of the grinding disk faces upward A holder to be held, a handle provided at one end by a human hand, an arm having the other end fixed to the holder, and the adapter On the other hand, a moving part guided and moved in a predetermined direction parallel to the surface to be ground, and interposed between the holder and the moving part, the holder is translated in the vertical direction with respect to the moving part. A telescopic mechanism; and a tilting mechanism that is interposed between the holder and the moving unit and tilts the holder in an up-down direction around an axis perpendicular to the predetermined direction with respect to the moving unit. It is a feature.

  In such a grinder holding device of the present invention, the holding device for holding the disc grinder is fixed to the structure around the object to be ground by the fixing portion and is disposed below the surface to be ground of the object to be ground. It is mounted on the adapter, and the holder moves in the vertical direction with respect to the moving part by expanding and contracting the expansion / contraction mechanism, and the person performing the grinding holds the handle and moves the handle in the vertical direction with respect to the adapter. Since the tilting mechanism tilts the holder in the vertical direction with respect to the moving part, the tilting mechanism moves the disc grinder's grinding surface of the disc grinder closer to the surface to be ground of the object to be ground. The contact angle between the grinding disk and the surface to be ground of the object to be ground is arbitrarily adjusted to bring the grinding disk into contact with the surface to be ground, and the handle is added. When the holding tool is reciprocated in a predetermined direction parallel to the surface to be ground with respect to the adapter by pushing and pulling it in a predetermined direction, the grinding disc of the disc grinder makes the surface to be ground of the workpiece to be ground upward from below. Grind.

  Therefore, according to the grinder holding device of the present invention, the adapter on which the holding device for holding the disc grinder is mounted is fixed to the structure around the object to be ground by the fixing portion, and the surface to be ground of the object to be ground is viewed from below. Since it grinds upward, it can be used even in a narrow space without a support floor such as in a bridge girder. Moreover, since the holding device and the adapter are separated, the adapter can be fixed because it can be mounted as it is without changing the holding device by adapting only the adapter to the structure around the object to be ground. It can be applied relatively easily to any place, and can be easily carried by separating them.

  In addition, by moving the handle vertically with respect to the moving part, the contact angle between the grinding disc of the disc grinder and the surface to be ground of the workpiece can be adjusted, and the handle is moved to the surface to be ground with respect to the adapter. Since the object to be ground can be ground by pushing and pulling in a predetermined parallel direction, the grinding disk is applied to the surface to be ground of the object to be ground according to the degree of grinding of the surface to be ground while grinding the object to be ground. The contact angle and the pressing force can be adjusted at the same time, whereby the surface to be ground can be easily leveled and wear of the grinding disk due to grinding can be delayed.

  In the grinder holding device of the present invention, the expansion / contraction mechanism may be formed by connecting the moving part and the holder by a parallel link mechanism, and in this way, the grinding disk of the disk grinder The grinding surface of the grinding disk of the grinding machine can be brought close to the grinding target surface of the grinding object without changing the contact angle of the grinding object to the grinding target surface. The contact angle can be easily set to a desired angle by operating the handle.

  Further, in the grinder holding device of the present invention, the parallel link mechanism includes at least two sets of butterfly programs in which one butterfly plate of each of two hinges is coupled to face each other, the moving unit and the holder. The two other butterfly plates of each set of the two sets of butterfly programs are arranged in such a manner that they are aligned in the predetermined direction and the opening / closing central axis of the hinges is orthogonal to the predetermined direction. May be configured to be coupled to the moving part and the holder, and by doing so, the holder is translated in the vertical direction relative to the moving part by opening and closing two sets of butterfly programs together. be able to.

  Also, by using a butterfly program that combines two hinges, the holder moves up and down with respect to the moving part, and also moves forward and backward with respect to the moving part. On the other hand, if the hinge is arranged in the direction pushed forward, the grinding disc of the disc grinder can be advanced to a deeper position, and the grinding range can be broadened.

  Further, in the grinder holding device of the present invention, the holding device includes an adjuster that connects the arm and the moving unit and expands and contracts the extension mechanism by expanding and contracting a distance between the arm and the moving unit. In this case, since the parallel link mechanism constituting the expansion / contraction mechanism is interposed between the moving unit and the holder, the distance between the arm fixed to the holder and the moving unit by the adjuster. By expanding and contracting, the holder moves forward and backward with respect to the moving part and the link of the parallel link mechanism swings, so that the expansion and contraction mechanism can be expanded and contracted.

  Further, in the grinder holding device of the present invention, the adjuster is screwed through the arm and has a screw shaft provided with a knob at one end, and the other end of the screw shaft is rotatable to the moving portion. It is good also as a structure which has a connection member to connect, If it does in this way, the distance between an arm and a moving part can be easily expanded-contracted by grasping a knob and rotating an adjuster.

  Furthermore, in the grinder holding device of the present invention, the telescopic mechanism may include a stopper that limits the swing angle of the link of the parallel link mechanism, and in this way, the link swings excessively. Thus, it can be prevented from falling to the opposite side of the standing side.

  Furthermore, in the grinder holding device of the present invention, the tilting mechanism includes a hinge that tilts the holder with respect to the moving part as the handle moves, and a grinding surface of the grinding disk of the disc grinder. It is also possible to provide a spring that biases in a horizontal direction, and in this way, the person performing the grinding operation can tilt the holder vertically with respect to the moving part by operating the handle by hand. In the free state, the spring urges the holder to keep the grinding surface of the grinding disc of the disc grinder horizontal, so that the grinding disc can be ground even if the person who grinds during grinding removes the hand from the handle. If the grinding disk is rotated before the handle is operated manually by the person performing the grinding, the grinding disk Does not contact the cutting object surface, it is possible to ensure safety.

  Furthermore, in the grinder holding device of the present invention, the moving part is slidably fitted to a rail provided in the adapter and extending in the predetermined direction to form a guide mechanism together with the rail, and the adapter A linear bush that guides the movement of the moving part in the predetermined direction, and a wheel that travels on a surface parallel to the surface to be ground of the workpiece. Then, the moving part can be guided in the predetermined direction with respect to the adapter by the guide mechanism, and the moving part can be smoothly moved by using one of the wheels as a wheel without using two rails.

  In the grinder holding device of the present invention, the adapter may include a traveling surface on which the wheel travels instead of a surface parallel to the surface to be ground, and in this way, the moving unit is an adapter. It is possible to move even when there is no surface parallel to the surface to be ground below the surface to be ground of the workpiece.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view showing a first embodiment of a grinder holding device of the present invention, FIG. 2 is a side view showing a holding tool of the grinder holding device of the first embodiment, and FIG. FIG. 4 is a front view showing the grinder holding device of the first embodiment, FIG. 4 is a bottom view of the grinder holding device of the first embodiment seen from the direction of the arrow in FIG. 1, and FIGS. Is a cross-sectional view and a side view showing a state before the truffle is temporarily stiffened with temporary H steel in the repair and reinforcement process of the truffle that mainly has a fatigue crack in the welded portion of the steel floor slab bridge, 5 (c) and 5 (d) are cross-sectional views schematically showing a state after the truffles are once stiffened with temporary H steel in a process including a grinding operation using the grinder holding device of the embodiment. It is a side view.

  As shown in FIGS. 5 (a) and 5 (b), in the repair / reinforcement of the truffle 3 of the steel floor slab bridge 2 having a fatigue crack 1 or the like, the truffle 3 is cut by gas cutting and cut off as shown in FIG. As shown in c) and (d), there is a method in which an alternative rib (not shown) is newly bolted after the H steel 4 is attached as a temporary support stiffener. In such a method, the weld metal portion 6 remaining on the downward surface (lower surface) of the steel deck slab deck plate 5 after cutting the truffle 3 is ground with a disc grinder before the replacement rib is bolted, and the surface is leveled. Work is required. Therefore, in the first embodiment, the H steel 4 attached to the steel deck deck plate 5 after the truffle 3 is excised is disposed on the lower flange portion 4a of the H steel 4 to hold the disc grinder. 1 shows a grinder holding device 10 capable of grinding the weld metal portion 6.

  As shown in FIGS. 1 to 4, the grinder holding device 10 of the first embodiment includes a holding device 12 that holds the disc grinder 11 and an H steel 4 that is attached to the lower surface of the steel deck deck plate 5. And an adapter 14 fixedly supported by the lower flange portion 4a.

  The adapter 14 has two clamps 16 as fixing portions for fixing the adapter 14 to the lower flange portion 4a of the H steel 4 and the holding device 12 parallel to the lower surface of the steel deck deck plate 5 with respect to the adapter 14. And a round bar-like rail 18 that forms part of a guide mechanism that guides the steel steel 4 to move in a predetermined direction that is an extending direction of the H steel 4 and two clamps 16. It is comprised from the two support plates 20 which fix and support both ends.

  Here, the two clamps 16 are respectively arranged on the front (left side in FIG. 1) and the rear (right side in FIG. 1) of the adapter 14, and these clamps 16 are arranged as shown in FIG. From the U-shaped clamp frame 16a that is wider than the thickness of the lower flange portion 4a of the steel 4, and the bolt 16b that is threaded through the clamp frame 16a and presses the lower flange portion 4a against the inside of the clamp frame 16a. It has become.

  Further, the two support plates 20 protrude from the two clamp frames 16a toward the sides, respectively, and the support plates 20 extend in the front-rear direction of the adapter 14, that is, in the predetermined direction. The rail 18 is penetrated and held. Further, as shown in FIG. 4, both ends 18 a of the rail 18 are arranged in the diameter direction of the rail 18 in order to prevent the rail 18 from moving in the front-rear direction of the adapter 14 and falling off from the support plate 20. A stopper pin 18b extending therethrough is provided.

  On the other hand, the holding tool 12 moves the holding tool 12 in the front-rear direction with respect to the adapter 14 and the holder 22 for holding the disc grinder 11 having the grinding disk 11a so that the grinding surface of the grinding disk 11a faces upward. Between the grinding disk 11a of the disk grinder 11 and the welded metal part 6, the moving part 24 to be operated, the arm 26 provided with a handle 26 operated by a grinder at one end and the other end fixed to the holder 22. An expansion / contraction mechanism 30 for adjusting the distance, an adjuster 32 for expanding / contracting the expansion / contraction mechanism 30, and a tilting mechanism 34 for adjusting the contact angle between the grinding disk 11 a of the disk grinder 11 and the weld metal portion 6. The disc grinder 11 here is a general disc grinder and is an electric type. It may be a pneumatic also.

  As shown in FIG. 3, the moving portion 24 is arranged across the rail 18 of the adapter 14 and the upper surface 4 b of the lower flange portion of the H steel 4. The moving portion 24 is guided by the rail 18 and In order to move the moving part 24 in the extending direction of the rail 18, a normal linear bush 36 slidably fitted to the rail 18 to form a part of the guide mechanism, and the upper surface of the lower flange part of the H steel 4 4b is disposed between the linear bushing 36 and the wheel 38 portion on the lower surface of the wheel 40 that travels on the wheel 4b, the substrate 40 that supports the linear bushing 36 and the wheel 38 while being spaced apart from each other, The adjuster 32 is composed of a hook 42 for connecting to the moving unit 24. Here, the wheel 38 is screwed into an angle 44 attached to the substrate 40, and the distance between the angle 44 and the wheel 38 is increased. Is adjustable levelness of the substrate 40.

  The expansion / contraction mechanism 30 includes two sets of butterfly programs 48 and 49 in which one butterfly plate 45a and 46a of the two hinges 45 and 46 are coupled to each other so as to face each other, and a moving unit. 24, and the butterfly programs 48 and 49 are arranged between the substrate 40 and the plate 50 in the above-mentioned front-rear direction (left-right direction in FIG. 2) of the adapter 14, And the parallel link mechanism is comprised side by side so that the opening-and-closing center axis line of those hinges 45 and 46 may be orthogonal to the said front-back direction, and it can be opened and closed in the front-back direction. Further, from the upper surface of the rear side of the plate 50 (right side in FIG. 2), a stopper 52 formed in a U-shape is projected toward the butterfly program 49 on the rear side in the front-rear direction, and the butterfly program 48, The butterfly programs 48 and 49 are prevented from opening excessively by making the tip of the stopper 52 abut the butterfly program 49 on the rear side while the 49 is opened at a right angle.

  The tilt mechanism 34 includes a hinge 54 that opens and closes with respect to the moving part 24 and a spring 56 that constantly biases the hinge 54 in a closing direction to keep the holder 22 horizontal in a free state. Between the upper plate 50 and the holder 22.

  The holder 22 is threaded through the substantially U-shaped hold frame 22a that surrounds the front end of the disc grinder 11 with a slight gap, and both side walls of the hold frame 22a. Two bolts 22b fixed to the hold frame 22a and a holder plate 22c fixed to the lower part of the hold frame 22a and extending in the length direction of the disc grinder 11. The lower surface of the holder plate 22c is a tilting mechanism. 34 is fixed to one hinge plate 54a of the hinge 54.

  The other end of the arm 28 is fixed to the lower surface of the holder plate 22c. The other end of the arm 28 has a handle 26 at one end which is gripped by a person who performs grinding. A hole 28a for allowing the adjuster 32 to pass therethrough and a nut 28b to be screwed with the adjuster 32 are disposed between the holder 22 plate and the holder 22 plate.

  The adjuster 32 penetrates the hole 28a of the arm 28 and is screwed with the nut 28b of the arm 28, a knob 32b for rotating the screw shaft 32a, a moving part 24, and a screw shaft 32a. And a hook 32d for connecting the connecting portion 32c to the screw shaft 32a. The connecting portion 32c has a swivel 32e as a connecting member for returning the twist caused by the rotation of the screw shaft 32a. Is provided.

  In the grinder holding device 10 of the first embodiment, the holding device 12 for holding the disc grinder 11 is fixed to the lower flange portion 4a of the H steel 4 attached to the lower surface of the steel deck deck plate 5 by a clamp 16. The holder 22 is moved to the moving part by rotating the knob 32b of the adjuster 32 to shorten or extend the distance between the arm 28 and the moving part 24 and to extend / contract the expansion / contraction mechanism 30. The holder 22 moves with respect to the moving unit 24 by the tilting mechanism 34 by moving the handle 26 in the vertical direction with respect to the adapter 14. Therefore, the telescopic mechanism 30 sets the grinding surface of the grinding disk 11a of the disk grinder 11 as the surface to be ground of the workpiece. The contact angle between the grinding disk 11a of the disk grinder 11 and the surface of the weld metal part 6 is arbitrarily adjusted by the tilting mechanism 34 while appropriately approaching the weld metal part 6 of the weld metal part 6, and the grinding disk 11a is adjusted to the surface of the weld metal part 6. The holding tool 12 reciprocates in the front-rear direction with respect to the adapter 14 by pushing and pulling the handle 26 in the front-rear direction of the adapter 14, and the grinding disk 11 a of the disk grinder 11 is welded to the weld metal portion 6. Grind upward from below.

  Therefore, according to the grinder holding device 10 of the first embodiment, the adapter 14 that movably supports the holding device 12 that holds the disc grinder 11 is attached to the lower flange portion 4a of the H steel 4 of the steel deck deck plate 5. Since the welded metal portion 6 is ground upward from below by being fixed with the clamp 16 of the adapter 14, it can be used even in a narrow space without a support floor, such as in a bridge girder. Moreover, since the holding device 12 and the adapter 14 are separated from each other, only the adapter 14 is a structure around the workpiece (in this case, the lower flange portion 4a of the H steel 4 attached to the lower surface of the steel deck deck plate 5). ), The holding device 12 can be mounted as it is without changing, so that the adapter 14 can be applied to any place where the adapter 14 can be fixed relatively easily. And the adapter 14 can be easily carried by separating them.

  The contact angle between the grinding disk 11a of the disk grinder 11 and the weld metal part 6 can be adjusted by moving the handle 26 in the vertical direction with respect to the moving part 24. Since the weld metal part 6 can be ground by pushing and pulling in the front-rear direction of the adapter 14, the grinding disk 11 a and the weld metal part 6 according to the degree of grinding of the weld metal part 6 while grinding the weld metal part 6. It is possible to adjust the contact angle and the pressing force at the same time, whereby the surface to be ground of the portion where the weld metal portion 6 was present can be easily leveled and the grinding disk 11a is worn by grinding. Can be delayed.

  Furthermore, according to the grinder holding device 10 of the first embodiment, the telescopic mechanism 30 sets a pair of butterfly programs in which the butterfly plates 45a and 46a of the two hinges 45 and 46 are coupled to face each other. The two butterfly programs 48 and 49 are arranged on the substrate 40 of the moving unit 24 in the front-rear direction of the adapter 14 to form a parallel link mechanism, and are arranged to be openable and closable with respect to the moving unit 24 in the front-rear direction. Thus, the holder 22 can be moved in the vertical direction with respect to the moving unit 24 by opening and closing the butterfly programs 48 and 49.

  In addition, by using two sets of butterfly programs 48 and 49, each of which is a combination of two hinges 45 and 46, the holder 22 moves in the vertical direction with respect to the moving unit 24 and also in the front and rear direction with respect to the moving unit 24. When the holder 22 is raised, the holder 22 is pushed forward with respect to the moving portion 24 in conjunction with the rise, and the grinding disk 11a of the disk grinder 11 can be advanced to a deeper position. Thus, the grinding range can be expanded.

  Furthermore, according to the grinder holding device 10 of the first embodiment, the holding device 12 includes the adjuster 32 that connects the arm 28 and the moving unit 24 and expands / contracts the distance between the arm 28 and the moving unit 24. Therefore, by shortening or extending the distance between the arm 28 and the moving unit 24 with the adjuster 32, the holder 22 moves in the front-rear direction with respect to the moving unit 24, and the butterfly programs 48 and 49 are opened and closed in conjunction therewith. Thus, the telescopic mechanism 30 can be expanded and contracted.

  Furthermore, according to the grinder holding device 10 of the first embodiment, the adjuster 32 is screwed through the nut 28b of the arm 28 and has a knob 32b at one end, and the screw shaft 32a. Since the connecting portion 32c is rotatably connected to the moving portion 24 at the other end, the arm 28 and the moving portion 24 can be easily moved by grasping the knob 32b and rotating the screw shaft 32a. The distance between can be expanded and contracted.

  Further, according to the grinder holding device 10 of the first embodiment, since the telescopic mechanism 30 includes a stopper for limiting the opening degree of the butterfly programs 48 and 49, the butterfly programs 48 and 49 are excessively opened. It is possible to prevent 22 from falling forward of the moving unit 24.

  Furthermore, according to the grinder holding device 10 of the first embodiment, the tilting mechanism 34 includes the hinge 54 that tilts the holder 22 relative to the moving part 24 as the handle 26 moves, and the holder 22 is ground on the disc grinder 11. And a spring 56 that urges the grinding surface of the disk 11a to be horizontal, so that a person who performs grinding manually operates the handle 26 to move the holder 22 up and down with respect to the moving part 24. In the free state, the spring 56 urges the holder 22 to keep the grinding surface of the grinding disk 11a of the disk grinder 11 horizontal, so that a person who performs grinding during the grinding operation can manually The grinding disk 11a does not continue to contact the welded metal portion 6 as the surface to be ground of the object to be ground even if it is released. Since the grinding disc 11a also 26 rotates the grinding disc 11a prior to operating by hand is not in contact with the weld metal portion 6, it is possible to ensure safety.

  According to the grinder holding device 10 of the first embodiment, the moving part 24 is slidably fitted to the rail 18 provided in the adapter 14 and extending in the front-rear direction of the adapter 14. The linear bush 36 which comprises a guide mechanism with 18 and guides the movement of the moving portion 24 relative to the adapter 14 in the front-rear direction, and the upper surface of the lower flange portion of the H steel 4 attached to the lower surface of the steel deck deck plate 5 4b, so that the moving mechanism 24 can be guided in the front-rear direction with respect to the adapter 14 by the guide mechanism, and one of the two is not used. By using the wheel 38, the moving part 24 can be moved smoothly.

  Next, a second embodiment of the grinder holding device of the present invention will be described in detail with reference to the drawings. FIG. 6 is a side view showing a grinder holding device according to the second embodiment of the present invention, and FIGS. 7A, 7B, and 7C are adapters of the grinder holding device according to the second embodiment. 8A and 8B are a side view, a plan view, and a rear view seen from the direction of the arrow in FIG. 7B, respectively, and FIGS. 8A and 8B each have a fatigue crack mainly in the welded portion of the steel deck bridge. FIG. 2 is a perspective view schematically showing a vertical stiffener before and after cutting, in which the same parts as those in the first embodiment are explained using the same reference numerals; Further, those having similar actions and effects will not be described.

  As shown in FIGS. 8 (a) and 8 (b), the vertical stiffener 61 attached to the main girder web 58 (or lateral rib or lateral girder) of the steel floor slab bridge having a fatigue crack 60 or the like. In the repair, a part of the vertical stiffener 61 is cut off by gas cutting and then a steel plate (plate) connecting the steel deck deck plate 62 and the vertical stiffener 61 is bolted. Then, it is necessary to grind the weld metal portion 63 remaining on the downward surface (lower surface) of the steel deck slab plate 62 with a disc grinder to level the surface of the steel deck slab deck plate 62. Therefore, in this second embodiment, after part of the vertical stiffener 61 is excised, it is attached to the remaining part of the vertical stiffener 61 to hold the disc grinder and grind the weld metal part 63. A grinder holding device 70 is shown.

  As in the first embodiment, the grinder holding device 70 of the second embodiment includes a holding device 12 that holds the disc grinder 11 and an adapter 72 that mounts the holding device 12. FIG. As shown, the adapter 72 is fixedly supported by a vertical stiffener 61 of a steel floor slab bridge. Here, the holding device 12 mounted on the adapter 72 has the same configuration as the holding device 12 of the first embodiment, except that the wheel 38 has two wheels 38 aligned in the moving direction.

  As shown in FIG. 7, the adapter 72 fixes the adapter 72 to the vertical stiffener 61, a clamp 74 as a fixing portion, and the holding device 12 with respect to the adapter 72 on the lower surface of the steel deck deck plate 62. The holding device 12 is guided in such a manner that the adapter 72 moves in the front-rear direction of the adapter 72 in the parallel direction and the width direction of the vertical stiffener 61 (the left-right direction in FIGS. 7A and 7B). The rail 76 which comprises a guide mechanism combining with the linear bush 36 of the moving part 24, and the running surface 78 which has the upper surface which supports the two wheels 38 of the moving part 24 of the holding fixture 12 so that driving | running | working is comprised. Yes.

  The clamp 74 is provided in front of the adapter 72 (to the right in FIG. 6), and is brought into contact with the end of the vertical stiffener 61 where the main girder web 58 in the width direction is not attached. The U-shaped clamp frame 74a that makes the traveling surface 78 parallel to the steel deck deck plate 62 and the vertical stiffener 61 are spaced apart from each other and fixed to the clamp frame 74a. The clamp plates 74b and 74c are threaded through one clamp plate 74b, and the vertical stiffener 61 is pressed against the inside of the other clamp plate 74c to fix the clamp plates 74b and 74c to the vertical stiffener 61. It consists of two bolts 74d. Furthermore, at the upper end of the outer side of each clamp plate, angles 82 and 83 that are parallel to the steel deck deck plate 62 are directed toward the rear of the adapter 72 (leftward in FIGS. 7A and 7B). The clamp frame 74a and the clamp plates 74b and 74c, and the clamp plates 74b and 74c and the angles 82 and 83 are fixed to each other with screws (not shown), respectively.

  And on each angle 82 and 83, the rectangular board | plate materials 84 and 85 so that it may extend in the front-back direction (left-right direction in FIG. 7) of the adapter 72, respectively, in parallel with the steel deck deck plate 62, respectively. One of the plate members 84 and 85 (downward in FIG. 7B) has a running surface 78 on which the two wheels 38 of the holding device 12 travel, and the other plate member 85 ( 7B supports the rail 76 that constitutes the guide mechanism.

  The rails 76 extend along the plate member 85 and are supported at both ends by L-shaped bearings 87 protruding upward from both ends of the plate member 85. A stopper 89 is provided to prevent the adapter 72 from moving in the front-rear direction of the adapter 72 and falling off the bearing 87.

  The holding device 12 mounted on the adapter 72 of the grinder holding device 70 of the second embodiment is substantially the same as the holding device 12 of the first embodiment as described above. In the example, the wheel 38 of the holding device 12 runs on the upper surface 4 b of the lower flange portion of the H steel 4, whereas in this second embodiment, the wheel 38 of the holding device 12 runs on the running surface 78 of the adapter 72. It is different in that.

  In the grinder holding device 70 of the second embodiment, the holding device 12 that holds the disc grinder 11 is mounted on an adapter 72 that is fixed to the vertical stiffener 61 of the steel deck slab bridge by a clamp 74. By rotating the knob 32 b of the adjuster 32, the distance between the arm 28 and the moving unit 24 is shortened or extended, and the telescopic mechanism 30 is expanded and contracted, whereby the holder 22 moves in the vertical direction with respect to the moving unit 24. A person who performs grinding grips the handle 26 and moves the handle 26 in the vertical direction with respect to the adapter 72, so that the holder 22 is tilted in the vertical direction with respect to the moving unit 24 by the tilting mechanism 34. While making the grinding surface of the grinding disk 11a of the disk grinder 11 appropriately approach the weld metal part 63 as the surface to be ground of the workpiece to be ground by the mechanism 30, The moving mechanism 34 arbitrarily adjusts the contact angle between the grinding disk 11a of the disk grinder 11 and the surface of the weld metal part 63 to bring the grinding disk 11a into contact with the surface of the weld metal part 63 and the handle 26 to the adapter 72. By pushing and pulling in the front-rear direction, the holding tool 12 reciprocates in the front-rear direction with respect to the adapter 72, and the grinding disk 11a of the disk grinder 11 grinds the weld metal part 63 upward from below.

  Therefore, according to the grinder holding device 70 of the second embodiment, the adapter 72 that movably supports the holding device 12 that holds the disc grinder 11 is attached to the vertical stiffener 61 of the steel floor slab bridge. By fixing with the clamp 74, the weld metal part 63 is ground upward from below, so that it can be used even in a narrow space without a support floor such as in a bridge girder. Moreover, since the holding device 12 and the adapter 72 are separated from each other, only the adapter 72 is adapted to the structure around the object to be ground (in this case, the vertical stiffener 61 of the steel deck bridge). Since the holding device 12 can be mounted as it is, the adapter 72 can be applied to any place where the adapter 72 can be fixed relatively easily, and the holding device 12 and the adapter 72 can be separated. Can be easily carried around.

  Further, by moving the handle 26 in the vertical direction with respect to the moving part 24, the contact angle between the grinding disk 11a of the disk grinder 11 and the weld metal part 63 can be adjusted, and the handle 26 is adjusted with respect to the adapter 72. Since the weld metal part 63 can be ground by pushing and pulling in the front-rear direction of the adapter 72, the grinding disk 11a and the weld metal part 63 according to the degree of grinding of the weld metal part 63 while grinding the weld metal part 63. It is possible to adjust the contact angle and the pressing force at the same time, whereby the surface to be ground of the portion where the weld metal portion 63 was present can be easily leveled and the grinding disk 11a is worn by grinding. Can be delayed.

  Moreover, according to the glider holding device 70 of the second embodiment, since the adapter 72 has the running surface 78 on which the wheel 38 of the holding device 12 runs, the moving part 24 is supported by the adapter 72, Even if there is no surface parallel to the surface to be ground below the surface to be ground of the workpiece, it can move.

  As mentioned above, although demonstrated based on the example of illustration, this invention is not limited to the above-mentioned Example, It can change suitably within the description range of a claim, For example, the fixing | fixed part of an adapter is Any material can be used as long as it can be fixed to a part of the object to be ground, and a magnet may be used instead of the clamp. In the embodiment, the distance between the moving unit and the arm has been described as extending and contracting by rotating the screw shaft of the adjuster threaded through the nut of the arm. A round bar provided with through holes at arbitrary intervals is used, and instead of the nut of the arm, a boss having a through hole corresponding to the through hole is also provided. It is possible to adjust the distance between the moving part and the arm step by step by appropriately replacing the pins that fix the round bar and the boss to each other.

  Thus, according to the grinder holding device of the present invention, the adapter on which the holding device for holding the disc grinder is mounted is fixed to the structure around the workpiece by the fixing portion, and the surface to be ground of the workpiece is ground from below. Since it grinds upward, it can be used even in a narrow space without a support floor such as in a bridge girder. Moreover, since the holding device and the adapter are separated, the adapter can be fixed because it can be mounted as it is without changing the holding device by adapting only the adapter to the structure around the object to be ground. It can be applied relatively easily to any place, and can be easily carried by separating them.

  In addition, by moving the handle vertically with respect to the moving part, the contact angle between the grinding disc of the disc grinder and the surface to be ground of the workpiece can be adjusted, and the handle is moved to the surface to be ground with respect to the adapter. Since the object to be ground can be ground by pushing and pulling in a predetermined parallel direction, the grinding disk is applied to the surface to be ground of the object to be ground according to the degree of grinding of the surface to be ground while grinding the object to be ground. The contact angle and the pressing force can be adjusted at the same time, whereby the surface to be ground can be easily leveled and wear of the grinding disk due to grinding can be delayed.

It is the side view which showed 1st Example of the grinder holding | maintenance apparatus of this invention. It is the side view which showed the holding fixture of the grinder holding | maintenance apparatus of the said 1st Example. It is the front view which showed the grinder holding | maintenance apparatus of the said 1st Example. It is the bottom view which looked at the grinder holding device of the said 1st Example from the arrow direction in FIG. (A), (b) shows the state of the steel floor slab bridge before the stiffening of the truffle with temporary H steel in the repair / reinforcement process of the truffle having a fatigue crack mainly in the welded portion. (C) and (d) are schematic views after the truffles are once stiffened with temporary H steel in a process including a grinding operation using the grinder holding device of the above embodiment. It is sectional drawing and side view which were shown automatically. It is a side view which shows the grinder holding | maintenance apparatus of 2nd Example of this invention. (A), (b), (c) is the side view which shows the adapter of the grinder holding | maintenance apparatus of the said 2nd Example, respectively, the top view, and the rear view seen from the arrow direction in FIG.7 (b). (A), (b) is the perspective view which showed typically before and after cut | disconnecting the vertical stiffener which mainly has a fatigue crack in the welding part of a steel floor slab bridge, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fatigue crack 2 Steel floor slab bridge 3 Trough rib 4 H steel 4a Lower flange part 4b Upper surface of lower flange part 5 Steel floor slab deck plate 6 Weld metal part 10 Grinder holding device 11 Disc grinder 11a Grinding disk 12 Holding tool 14 Adapter 16 Clamp 16a Clamp frame 16b Bolt 18 Rail 18a Rail both ends 18b Stopper pin 20 Support plate 22 Holder 22a Hold frame 22b Bolt 22c Holder plate 24 Moving part 26 Handle 28 Arm 28a Hole 28b Nut 30 Extending mechanism 32 Adjuster 32a Screw shaft 32 32c connecting portion 32d hook 32e swivel 34 tilting mechanism 36 linear bush 38 wheel 40 substrate 42 hook 44 angle 45 hinge 45a butterfly plate 45b butterfly plate 46 hinge 46a butterfly plate 4 6b Butterfly plate 48 Butterfly program 49 Butterfly program 50 Plate 52 Stopper 54 Hinge 54a Butterfly plate 56 Spring 58 Main girder web 60 Fatigue crack 61 Vertical stiffener 62 Steel deck deck plate 63 Weld metal part 70 Grinder holding device 72 Adapter 74 Clamp 74a Clamp frame 74b Clamp plate 74c Clamp plate 74d Bolt 76 Rail 78 Running surface 82 Angle 83 Angle 84 Plate material 85 Plate material 87 Bearing 88 Stopper

Claims (9)

A grinder holding device for holding a disc grinder having a grinding disc so that the grinding surface of the grinding disc faces upward in order to grind the surface to be ground of the workpiece to be ground upward from below.
A holding device for holding the disc grinder;
An adapter that is fixedly supported on a structure around the object to be ground by a fixing part and is arranged below the surface to be ground of the object to be ground, and that mounts the holding device in a separable manner,
The holding device is
A holder for holding and holding the disc grinder so that the grinding surface of the grinding disc is facing upward;
A handle that is manually operated by one person at one end and an arm having the other end fixed to the holder;
For the adapter, a moving part that is guided and moved in a predetermined direction parallel to the surface to be ground;
An expansion / contraction mechanism interposed between the holder and the moving part, and moving the holder in parallel with the moving part in the vertical direction;
A tilting mechanism that is interposed between the holder and the moving unit, and tilts the holder in an up-down direction around an axis perpendicular to the predetermined direction with respect to the moving unit;
A grinder holding device comprising:   The grinder holding device according to claim 1, wherein the expansion / contraction mechanism is formed by connecting the moving unit and the holder by a parallel link mechanism.   The parallel link mechanism aligns at least two sets of butterfly programs in which one butterfly plate of each of the two hinges is opposed to each other in the predetermined direction between the moving unit and the holder, And the opening / closing center axis of the hinges is arranged so as to be orthogonal to the predetermined direction, and the other two butterfly plates of each set of the two sets of butterfly programs are coupled to the moving part and the holder. The grinder holding device according to claim 2, wherein   The said holding | maintenance instrument is equipped with the adjuster which expands / contracts the said expansion-contraction mechanism by expanding / contracting the distance of the said arm and the said movement part while connecting the said arm and the said movement part. Grinder holding device. The adjuster is
A screw shaft threaded through the arm and provided with a knob at one end;
A connecting member that rotatably connects the other end of the screw shaft to the moving part;
The grinder holding device according to claim 4, characterized by comprising:   The grinder holding device according to any one of claims 2 to 5, wherein the expansion / contraction mechanism includes a stopper that limits a swing angle of the link of the parallel link mechanism. The tilt mechanism is
A hinge for tilting the holder with respect to the moving part as the handle moves;
A spring for biasing the holder in a direction in which a grinding surface of the grinding disk of the disk grinder is horizontal;
The grinder holding device according to any one of claims 1 to 6, further comprising: The moving unit is
A linear guide that guides the movement of the moving portion relative to the adapter in the predetermined direction by slidably fitting with a rail provided on the adapter and extending in the predetermined direction to form a guide mechanism. With Bush,
A wheel traveling on a surface parallel to the surface to be ground of the object to be ground;
The grinder holding device according to any one of claims 1 to 7, characterized by comprising:   The grinder holding device according to claim 8, wherein the adapter includes a traveling surface on which the wheel travels instead of a surface parallel to the surface to be ground.

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