JP6420652B2 - Beam clamp - Google Patents

Description

  The present invention relates to a beam clamp used when a lifting operation is performed with a chain block or a hoist (hereinafter referred to as “chain block or the like”) using a beam of a building, and a lifting method using the beam clamp.

  When using a building block made of H-shaped steel or I-shaped steel (hereinafter referred to as “building beam”) to lift a chain block, the steel clamp is fixed to the flange of the building beam. In general, a shackle or hook (hereinafter referred to as “shackle or the like”) attached to a chain block or the like via a wire is used as a fulcrum.

  At this fulcrum, a screw-type steel clamp that has been developed and marketed widely as a jig for lifting a steel plate or the like, for example, an iron clamp called “Eagle Clamp (registered trademark)” shown in FIG. (Hereinafter referred to as “screw type steel clamp”) is often used.

  Since the lifting work performed with a chain block or the like includes diagonal pulling and horizontal pulling, the load is often applied in the lateral direction in addition to the vertical load with respect to the fulcrum with the building beam. In the case of a screw-type steel clamp, it is possible that the load will deviate from the flange of the building beam, and in the worst case it may fall off. In order to avoid such a danger, as shown in FIG. 5, two screw type steel clamps are arranged so as to sandwich the flange of the building beam, and a shackle of two wires extended from the chain block etc. A method of stably receiving a lateral load is also adopted by connecting the two to each other and supporting them at two points.

  Further, as shown in FIG. 6, a pair of clamp plates are rotatably coupled via the opening / closing shafts, and the opening / closing shafts are used as coupling points for shackles such as chain blocks, and hooks provided on the respective clamping plates. Beam clamps (hereinafter referred to as “screw beam clamps”) that are fixed to the beam by adjusting the opening of the pair of clamp plates with screws so that the part hooks on both ends of the flange of the building beam are also commercially available and widely used Yes. Patent Document 1 is an invention related to the improvement of the screw beam clamp.

  Compared to the case of using two screw-type steel clamps, the screw-type beam clamp can receive the load more stably when the load is applied in the lateral direction in addition to the load in the vertical direction. There is an advantage that the preparatory work is easy as compared with the case where the screw type steel clamp is carried to a predetermined place and the two screws are fastened and fixed respectively.

  On the other hand, each building beam is selected in various dimensions according to its original role, so there are various building beams with different flange sizes even in a single building. . Therefore, it is very important in terms of versatility that a jig for constructing a fulcrum such as a chain block on a building beam can cope with various flange sizes, that is, various flange widths and thicknesses. Speaking from this point, both the screw type steel clamp that adjusts the opening of the clamp plate with the screw and the method of arranging two screw type steel clamps sandwiching the flange of the building beam are both the flanges of the building beam. It can be said that it has correspondence to the size of.

  However, the method using two screw-type steel clamps is inferior in workability as described above and has a large weight because it has a cast steel main body. On the other hand, the screw-type beam clamp has relatively good workability, but has a complicated structure and a large weight. A heavy jig increases the burden on the operator during transportation and installation. In addition, these jigs are difficult to produce and arrange easily at the work site, and must be purchased and prepared in advance.

JP 2001-234905 A

None

  Therefore, the problem to be solved by the present invention is a beam clamp that is used when a chain block or the like is connected to a building beam to perform lifting work, and can cope with the size of various building beam flanges. The present invention is to provide a beam clamp that is light and easy to handle, has little burden on workers, has a simple structure, and can be easily manufactured and arranged at a work site, and a lifting method using the beam clamp.

The present invention for solving the above problems is a beam clamp for connecting a chain block or the like to a building beam,
A lateral opening into which the end of the flange of the building beam can be inserted; and a lower extension that extends over half the width of the flange along the bottom surface of the flange when the flange end is inserted into the opening. A plurality of first clamp plates provided at positions corresponding to the width of the flange of the lower extending portion, the upper extending portion having a shape in contact with the top surface of the flange. A bolt hole, a second bolt hole comprising a long hole extending in a direction perpendicular to the extending direction of the lower extending portion provided at the end of the lower extending portion, and the tip of the upper extending portion contact the flange A mounting hole for connecting a shackle or the like such as a chain block provided in the lower extension portion on the opposite side of the second bolt hole as viewed from a perpendicular line drawn from a portion (hereinafter referred to as “tip contact portion”) Two clamping plates having,
The two clamp plates are arranged so as to face each other with the flange interposed therebetween, and with one end of the flange inserted into the opening of each clamp plate, either one of the first bolt holes of one clamp plate A beam clamp comprising two sets of bolts and nuts that couple the two clamp plates to each other using the second bolt holes of the other clamp plate.

  The constituent members of the beam clamp of the present invention are only two plate members, that is, an A clamp plate, a B clamp plate, and two sets of bolts and nuts, which are easily available at the work site. Each of the clamp plate A and the clamp plate B has an end portion of a lower flange (hereinafter referred to as “target flange”) made of an H-shaped steel or an I-shaped steel to which the beam clamp is fixed. Has a lateral opening large enough to be inserted in, and the lower side of the opening extends more than half the width of the flange along the bottom surface of the flange when the target flange end is inserted into the opening. A lower extending portion is formed. On the other hand, the upper side of the opening has a shape in which the tip is in contact with the upper surface of the flange when the end of the target flange is inserted into the opening, that is, the tip part is lower than the back part of the opening. The upper extending portion having the shape is formed.

  The A clamp plate and the B clamp plate are arranged facing each other so as to sandwich the target flange, and are used in a state where the end portion of the target flange is inserted into each opening. At that time, the A lower extension part of the A clamp plate and the B lower extension part of the B clamp plate each have a length exceeding half of the width of the target flange, so that they are partially parallel to each other. Become.

  The 2nd bolt hole is provided in the edge part of A lower extending part. A first bolt hole is provided at a position corresponding to the second bolt hole of the A lower extending portion in the parallel B lower extending portion according to the width of the target flange. A plurality of first bolt holes are provided in accordance with the widths of a plurality of target flanges so as to have versatility that can be handled by one beam clamp even if the widths of the target flanges are different. The second bolt hole of the B lower extension part and the first bolt hole of the A lower extension part are also provided at the same relative positions.

  Two sets of the first bolt hole of the A lower extension part and the second bolt hole of the B lower extension part, and the first bolt hole of the B lower extension part and the second bolt hole of the A lower extension part, respectively. The beam clamp is fixed to the target flange by connecting with the bolts and nuts. The preparation of the lifting operation is completed by connecting shackles or the like of two wires extending from the chain block or the like to the mounting holes provided in the respective clamp plates.

  The attachment hole is provided in the lower extension part on the opposite side of the second bolt hole as seen from the part where the tip of the upper extension part contacts the flange, that is, the perpendicular line dropped from the tip contact part. By adopting this configuration, when a downward force is applied to the mounting hole from a shackle or the like, the force is transmitted to the upper surface of the target flange through the tip contact portion of the upper extension portion, and the clamp plate is centered on the tip contact portion. Rotate slightly. The rotation of the clamp plate stops when the tip of the lower extension portion comes into contact with the lower surface of the target flange, and the tip of the lower extension portion pushes up the lower surface of the target flange to give an upward force. Therefore, the target flange is sandwiched from both the upper and lower surfaces by the force from the chain block, etc. Even if only one clamp plate is used as a fulcrum, the resistance force against the lateral load from the chain block etc. And has little deviation.

  In this way, the clamp plate, which itself is firmly fixed to the target flange using the load from the chain block or the like, is arranged so as to sandwich the target flange, and those openings do not come off the end of the target flange. As described above, since the two bolts and nuts are fixed in accordance with the width of the target flange, it can be an extremely stable fulcrum with respect to the load in the vertical direction as well as the load in the horizontal direction.

  In addition, in order for the clamp plate to exert the sandwiching force from both sides of the upper surface and the lower surface of the target flange as described above, the clamp plate must be able to rotate slightly around the tip contact portion. This bolt hole is a long hole extending in a direction perpendicular to the extending direction of the lower extending portion. Therefore, even if two clamp plates are fixed at two locations using two sets of bolts and nuts, this movement is hindered. There is nothing.

  In the lower extension portion of the clamp plate, a first bolt hole is provided at a position corresponding to the second bolt hole of another clamp plate according to the width of the target flange. By providing a plurality of first bolt holes, even if the width of the target flange is different from, for example, 200 mm, 250 mm, and 300 mm, one beam clamp can be used, and versatility with respect to the width of the target flange can be provided. .

  In addition, as described above, the clamp plate is fixed to the flange at the tip contact portion and the tip of the lower extension portion by slightly rotating itself, so the width of the lateral opening provided in the clamp plate is the thickness of the target flange. There is no need to create exactly the same. By setting the width of the opening with a margin so that the end of the target flange of various thicknesses can be inserted and does not hinder the slight rotation around the tip contact part, Versatility.

  Since it consists of only two plates and two sets of bolts and nuts, it is light in weight, easy to handle, has little burden on workers, has a simple structure, and can be easily manufactured and arranged on site.

  Furthermore, this invention which solves the said subject is the lifting method performed by connecting a chain block etc. to a building beam using said beam clamp.

  The beam clamp described above can be a very stable fulcrum with respect to a horizontal load as well as a vertical load from a chain block or the like, so that a safe and reliable lifting operation can be performed. In addition, the burden on the worker is small as described above.

  The beam clamp of the present invention is a very stable fulcrum for not only the load from the vertical direction from the chain block or the like but also the load from the lateral direction. Moreover, even if the size of the target flange to which the beam clamp is fixed is different, it has a versatility that can be handled by one beam clamp. In addition, it is light in weight and easy to handle, has little burden on workers, has a simple structure, and can be easily manufactured and arranged at the work site.

  Further, since the beam clamp of the present invention can be a very stable fulcrum with respect to the horizontal load as well as the vertical load from the chain block or the like, the lifting method performed using the beam clamp of the present invention is adopted. Thus, a safe and reliable lifting operation can be performed. In addition, as described above, the burden on workers in preparation work such as transportation and installation is small.

It is the front view (a) and side view (b) of Example 1 of the beam clamp of this invention. FIG. It is explanatory drawing of the lifting method (Example 2) performed using the beam clamp of this invention. It is explanatory drawing of the clamp for screw type steels of a prior art. It is explanatory drawing of an example of the usage method. It is explanatory drawing of the screw type beam clamp of a prior art.

  Embodiments of the present invention will be described with reference to the drawings. The present invention is not limited to such an embodiment, and it goes without saying that various modifications may be made to the specific structure within the scope of the present invention.

  1A and 1B are a front view and a side view of a beam clamp 1 according to a first embodiment of the present invention. The beam clamp 1 is composed of only two plate members, that is, an A clamp plate 2 and a B clamp plate 3 and two sets of bolts and nuts 5 and 6.

  Each of the A clamp plate 2 and the B clamp plate 3 has lateral openings 2a and 3a large enough to insert the end portions 8a and 8b of the target flange 8 therein, and the lower sides of the openings are the target flanges. When the end portion is inserted into the opening, lower extending portions 2b and 3b are formed that extend over half the width of the flange along the lower surface 8c of the flange. On the other hand, the side above the opening has a shape in which the tips 2c and 3c are in contact with the upper surface 8d of the flange when the end portion of the target flange is inserted into the opening, that is, compared to the back portion of the opening. Upper extending portions 2d and 3d having a shape in which the portion is lowered are formed.

  The A clamp plate 2 and the B clamp plate 3 are arranged to face each other with the target flange 8 interposed therebetween, and are used in a state where the target flange end portions 8a and 8b are inserted into the respective openings 2a and 3a. At that time, since the lower A extended portion 2b and the lower B extended portion 3b each have a length that exceeds half the width of the target flange 8, they are partially parallel to each other.

  FIG. 2 is an explanatory view showing the beam clamp of the first embodiment in an exploded manner. A second bolt hole 2e is provided at the end of the A lower extending portion 2b, and a second bolt hole 3e is provided at the end of the B lower extending portion. The A lower extension 2b is provided with first bolt holes 2f1, 2f2, 2f3, and the B lower extension 3b is provided with first bolt holes 3f1, 3f2, 3f3.

  When the ends 8a and 8b of the target flange 8 are inserted into the openings 2a and 3a, a first bolt hole 3f1 is provided at a position corresponding to the second bolt hole 2e, and similarly, the second bolt hole 3e. Since the first bolt hole 2f1 is provided at a position corresponding to, the A clamp plate 2 and the B clamp plate 3 can be obtained by tightening them using the bolt 5a and nut 5b and the bolt 6a and nut 6b. It is firmly integrated and fixed to the flange 8.

  1 and 2, the first bolt hole 3f1 and the first bolt hole 2f1 are selected, and the bolt bolts and nuts 5 and 6 are used to form the second bolt hole 2e and the second bolt hole 3e. Although it is tightened, this is an attachment procedure corresponding to FIG. 3 (c). When the beam clamp of the present invention is used for a building beam having a smaller flange width, as shown in FIG. 3 (b). When the first bolt hole 3f2 and the first bolt hole 2f2 are selected and used for a building beam having a smaller flange width, as shown in FIG. 3 (a), the first bolt hole 3f3 and the first bolt hole 3f2 By selecting the bolt hole 2f3 and tightening it to the second bolt hole 2e and the second bolt hole 3e with bolts and nuts 5 and 6, one beam clamp of the present invention can be used to produce three types of flanges having different widths. Can respond.

  In this embodiment, each of the clamp plates is provided with three first bolt holes. However, depending on the number of types of beams constituting the building that uses the beam clamp of the present invention, a larger number of first bolt holes are provided. It is also possible to provide one bolt hole.

  When the bolts and nuts 5 and 6 are tightened and the beam clamp of the present invention is attached to the building beam, the shackles of the two wires extended from the chain block etc. to the mounting holes 2g and 3g provided in the respective clamp plates Etc. are combined with each other to complete the preparatory work.

  A state in which the lifting operation is performed with a chain block or the like will be described with the A clamp plate 2 as an example. The mounting hole 2g is provided in the lower extending portion 2b opposite to the second bolt hole 2e when viewed from the perpendicular line 2h lowered from the tip contact portion 2c where the tip of the upper extending portion contacts the upper surface 8d of the flange. When a shackle or the like is coupled to the mounting hole 2g and a downward force F1 is applied from the shackle or the like to the mounting hole 2g, the force is transmitted to the upper surface 8d of the target flange through the tip contact portion 2c of the upper extension portion, and is directed downward. Force F2 is generated.

  On the other hand, the force F1 rotates the clamp plate 2 slightly counterclockwise around the tip contact portion 2c. The rotation of the clamp plate 2 stops when the tip 2k of the lower extension portion comes into contact with the lower surface 8c of the target flange, and the tip 2k of the lower extension portion pushes up the lower surface 8c of the target flange to give an upward force F3. As a result, when the force F1 from the chain block or the like is applied, the A clamp plate 2 sandwiches the target flange 8 with the downward force F2 and the upward force F3.

  Therefore, even if two clamp plates are not used in combination, and only one clamp plate is used as a fulcrum for a chain block or the like, it will have a resistance to lateral loads and will shift. Less is. In this way, the clamp plate, which itself is firmly fixed to the target flange using the load from the chain block or the like, is arranged so as to sandwich the target flange, and those openings do not come off the end of the target flange. As described above, since the two sets of bolts and nuts 5 and 6 are connected in accordance with the width of the target flange, it can be a very stable fulcrum with respect to the load in the vertical direction as well as the load in the horizontal direction.

  The B clamp plate 3 also receives the force from the chain block or the like and acts similarly to the A clamp plate 2. Here, the clamp plates 2 and 3 are fixed to the flange 8 by their tip contact portions 2c and 3c and the tips 2k and 3k of the lower extension portions by slightly rotating themselves, so that the lateral opening 2a provided in the clamp plate It is not necessary to create the width 3a so as to match the thickness of the target flange 8 exactly. Set the width of the openings 2a and 3a with enough margins so that the ends of the target flanges of various thicknesses can be inserted and the slight rotation around the tip contact portions 2c and 3c is not hindered. Thus, a beam clamp having versatility with respect to the thickness of the target flange can be obtained.

  In addition, in order for the clamp plate to rotate slightly around the tip contact portions 2c and 3c, it is obstructed by fixing two clamp plates at two locations using two sets of bolts and nuts 5 and 6. However, each clamp plate is a long hole in which the second bolt holes 2e and 3e extend perpendicular to the extending direction of the lower extending portions 2b and 3b. Even if two clamp plates are used and fixed, this movement is not hindered.

  FIG. 3 is an explanatory diagram of a lifting method (Example 2) performed using the beam clamp of the present invention. Cases in which the beam clamp 1 of the present invention is to be used in a building having building beams 81, 82, and 83 having flange widths different from 200 mm, 250 mm, and 300 mm are shown in (a), (b), and (c), respectively. It is shown.

  Case in which the beam clamp 1 is attached to the building beam 81 having the smallest flange width of 200 mm. In FIG. 3A, the second bolt hole 2e and the first bolt hole 3f3 shown in FIG. 2 bolt holes 3e and first bolt holes 2f3 are fastened with bolts and nuts 6 and fixed to the building beam 81, and then extended from the chain block 9 to the mounting holes 2g and 3g provided in the respective clamp plates. After the shackles 11 of the wires 10 are coupled to each other, an operation of lifting an object is performed.

  Case where the beam clamp 1 is attached to the building beam 82 having the second flange width of 250 mm. In FIG. 3B, the second bolt hole 2e and the first bolt hole 3f2 shown in FIG. The second bolt hole 3e and the first bolt hole 2f2 may be fastened and fixed with bolts and nuts 6. Further, in FIG. 3C, the beam clamp 1 is attached to the building beam 83 having the largest flange width of 300 mm. In FIG. 3C, the second bolt hole 2e and the first bolt hole 3f1 shown in FIG. The second bolt hole 3e and the first bolt hole 2f1 may be fastened and fixed with bolts and nuts 6.

  In any case, the beam clamp 1 can be an extremely stable fulcrum with respect to not only the vertical load from the chain block 9 but also the lateral load. Can perform heavy lifting work. In addition, the structure is simple, light and easy to handle, and the burden on workers during preparations such as transportation and installation is low.

1 Beam Clamp 2 A Clamp Plate 3 B Clamp Plate 2a, 3a Opening 2b, 3b Lower Extension 2c, 3c Tip of Upper Extension 2d, 3d Upper Extension 2e, 3e Second Bolt Hole 2f1, 2f2, 2f3, 3f1 3f2, 3f3 1st bolt hole 2g, 3g Perpendicular line 2k, 3k passing through mounting hole 2h 2c End of lower extension 5,6 Bolt / nut 5a, 6a Bolt 5b, 6b Nut 8 Target flange 8a, 8b Flange end 8c Flange bottom surface 8d Flange top surface 9 Chain block 10 Wire 11 Shackle 81, 82, 83 Building beams with different flange widths

Claims (2)

A beam clamp for connecting a chain block or hoist (hereinafter referred to as “chain block etc.”) to a beam (hereinafter referred to as “building beam”) made of H-shaped steel or I-shaped steel,
A lateral opening into which the end of the flange of the building beam can be inserted; and a lower extension that extends over half the width of the flange along the bottom surface of the flange when the flange end is inserted into the opening. A plurality of first clamp plates provided at positions corresponding to the width of the flange of the lower extending portion, the upper extending portion having a shape in contact with the top surface of the flange. A bolt hole, a second bolt hole comprising a long hole extending in a direction perpendicular to the extending direction of the lower extending portion provided at the end of the lower extending portion, and the tip of the upper extending portion contact the flange Shackles and hooks (hereinafter referred to as “shackles and the like”) of chain blocks and the like provided in the lower extension portion on the opposite side of the second bolt holes as viewed from the perpendicular line drawn from the portion (hereinafter referred to as “tip contact portion”) Mounting holes to connect) Two and a clamp plate that,
The two clamp plates are arranged so as to face each other with the flange interposed therebetween, and with one end of the flange inserted into the opening of each clamp plate, either one of the first bolt holes of one clamp plate A beam clamp comprising two sets of bolts and nuts that couple the two clamp plates together using the second bolt holes of the other clamp plate.   A lifting method performed by connecting a chain block or the like to a building beam using the beam clamp according to claim 1.

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