jig to prevent severed protrusions from falling.

Abstract

The present invention provides a fall prevention jig for preventing the cut upper and lower protrusions from falling when sequentially cutting upper and lower protrusions, which are attached at predetermined intervals to the steel frame of erected steel columns or steel structural members, using a cutting machine. [Solution] The fall prevention jig 51 consists of an upper fall prevention member 51a that holds and connects the upper projection 53 and the lower projection 54, respectively, and a lower fall prevention member 51b that holds the lower projection 54 and can be magnetically attached to and detached from the steel frame 52.

Description

Technical Field

[0001] The present invention relates to a fall prevention jig for preventing the fall of the cut upper protrusions and lower protrusions when cutting upper protrusions such as erection pieces, suspension pieces, guide pieces or joint plates, etc. protruding from connection parts such as steel columns in steel frame structures or reinforced concrete structures using a cutting machine.

Background Art

[0002] First, a conventional cutting machine for cutting protrusions protruding from a steel frame part to be erected will be described. As shown in FIGS. 16 and 17, the cutting machine 1 includes four strong magnet-type attachment parts 2 detachably attached to a steel column, rail guide columns 3 provided on each attachment part 2, a moving guide rail 4 provided across the front and rear rail guide columns 3, a moving roller 5 for moving along the moving guide rail 4, an attachment substrate 7 connected to the moving roller 5 and having a cutting opening 6 for a protrusion (object to be cut) to pass through at the central part, a drive motor 8 provided on the attachment substrate 7, a drive roller 9 provided on the attachment substrate 7 and driven in conjunction with the drive of the drive motor 8, a pair of driven rollers 10 provided on the attachment substrate 7 opposite to the drive roller 9, and a band saw 11 rotated by the driven roller 10 and the drive roller 9 (see Patent Document 1).

[0003] When cutting the protrusion 13 with the cutting machine 1 having such a configuration, as shown in FIG. 18, after magnetically attaching the four attachment parts 2 to the protrusion 13 of the steel column 12 to be erected, the drive motor 8 is driven to rotate the band saw 11 at high speed.

[0004] Then, the attachment substrate 7 descends along the moving guide rail 4 due to its own weight, the cutting opening 6 of the attachment substrate 7 passes through the protrusion 13, and the band saw 11 cuts the protrusion 13.

Prior Art Documents

Patent Documents

[0005] [Patent Document 1] Japanese Patent Publication No. 2006-21265 [Overview of the project] [Problems that the invention aims to solve]

[0006] In this conventional example of a cutting machine 1, the band saw 11 prevents the cut protrusion 13 from falling by grasping the protrusion 13 with its hand just before it finishes cutting it. However, if the timing of grasping the protrusion 13 with one's hand is incorrect and one fails to grasp it, or if one forgets to grasp it with one's hand, the protrusion 13 may fall downwards, which is extremely dangerous. In particular, when the protrusions 13 are provided at two locations, the upper and lower parts of the steel frame 12, with a predetermined interval between them, the cut protrusions 13 become even more difficult to grasp, increasing the risk of them falling downwards.

[0007] Therefore, when cutting a protrusion 13 using a conventional cutting machine 1, there is a problem that must be solved in which a mechanism to prevent the protrusion to be cut is provided even when there are two protrusions to be cut, an upper protrusion and a lower protrusion, spaced apart by a predetermined distance. [Means for solving the problem]

[0008] The gist of the present invention, which solves the problems of the aforementioned conventional example, is a fall prevention jig for preventing the cut upper and lower protrusions from falling when an upper protrusion and a lower protrusion, which are attached at predetermined intervals to the steel frame of an erected steel column or steel frame material, are sequentially cut using a cutting machine, wherein the fall prevention jig consists of an upper fall prevention member that holds the upper protrusion and the lower protrusion, respectively, in a connected state, and a lower fall prevention member that holds the lower protrusion and can be magnetically attached to and detached from the steel frame.

[0009] Furthermore, the upper fall prevention member comprises a first main body having a bottom portion for contacting the upper part of the lower projection, a first clamping portion consisting of two pieces spaced apart to clamp the upper part of the lower projection, a fixing screw screwed into one side of the first clamping portion and maintaining the clamped state of the lower projection held by the first clamping portion in a fixed state, a box-shaped guide portion erected on the first main body with an up / down position adjustment screw screwed into the front side, and a long hole into which the up / down position adjustment screw can be inserted, which allows for adjustment of the up / down position by moving up and down relative to the guide portion, and which can maintain the adjusted up / down position in a fixed state with the up / down position adjustment screw. Furthermore, the lower fall prevention member comprises a vertical position adjustment member having a first stopper surface for contacting the lower part of the upper projection, and a second clamping portion consisting of two pieces spaced apart at a predetermined distance, extending from the upper part of the vertical position adjustment member and clamping the lower part of the upper projection; the lower fall prevention member comprises a magnet portion that can be magnetically attached to and detached from the steel frame portion by switching it on and off, a second main body portion on which the magnet portion is provided, a box-shaped extension portion erected on the second main body portion and having a second stopper surface for contacting the lower part of the lower projection, and a third clamping portion provided on the extension portion and consisting of two pieces spaced apart at a predetermined distance, clamping the upper part of the lower projection; It includes. [Effects of the Invention]

[0010] According to the cutting jig for preventing cut protrusions from falling, when cutting an upper protrusion, the presence of an upper fall prevention member that holds and connects the upper and lower protrusions prevents the upper protrusion from falling because it is held in a clamped state. Furthermore, when cutting the lower protrusion, the lower protrusion is held in place by the clamping mechanism, and the presence of the lower fall prevention member, which is magnetically attached to the steel frame, prevents it from falling. Therefore, it has the excellent effect of improving safety by preventing accidents caused by the falling of upper and lower protrusions. [Brief explanation of the drawing]

[0011] [Figure 1] It is a perspective view of the upper fall prevention member from the front side. [Figure 2] It is a perspective view of the upper fall prevention member from the front side. [Figure 3] It is a perspective view of the upper fall prevention member from the back side. [Figure 4] It is a rear view of the upper fall prevention member. [Figure 5] It is a perspective view of the lower fall prevention member from the front side. [Figure 6] It is a perspective view of the lower fall prevention member from the front side. [Figure 7] It is a side view of the lower fall prevention member. [Figure 8] It is a side view for explaining the procedure of attaching the fall prevention jig (upper fall prevention member and upper fall prevention member) according to the present invention to the upper protrusion and the lower protrusion. [Figure 9] It is a perspective view of the cutting machine. [Figure 10] It is a side view of the cutting machine. [Figure 11] It is a front view of the cutting machine body. [Figure 12] It is a side view of the upper protrusion being cut by the cutting machine. [Figure 13] It is a side view of the upper protrusion after the cutting by the cutting machine is completed. [Figure 14] It is a side view of the lower protrusion being cut by the cutting machine. [Figure 15] It is a side view of the lower protrusion after the cutting by the cutting machine is completed. [Figure 16] It is a perspective view of the cutting machine according to the conventional example. [Figure 17] It is a perspective view of the cutting machine according to the conventional example. [Figure 18] It is a perspective view for explaining the usage state of the cutting machine according to the conventional example.

Mode for Carrying Out the Invention

[0012] Next, embodiments of the present invention will be described with reference to the drawings. The cut projection fall prevention jig 51 of the present invention is a fall prevention jig that prevents the cut upper projection 53 and lower projection 54 from falling when the upper projection 53 and lower projection 54, which are attached at predetermined intervals to the steel frame portion 52 of the erected steel column 24 or steel frame material, are sequentially cut using a cutting machine 21 (see Figures 8, 12 to 15). The upper projection 53 and lower projection 54 in each figure are, for example, erection pieces that protrude from the steel frame 52.

[0013] As shown in Figure 8, the fall prevention jig 51 consists of a metal upper fall prevention member 51a that holds and connects the upper projection 53 and the lower projection 54, and a metal lower fall prevention member 51b that holds the lower projection 54 and is magnetically attachable to and detachable from the steel frame 52.

[0014] As shown in Figures 1 to 4, the upper fall prevention member 51a comprises a first main body portion 55, a first clamping portion 56 hanging down from the first main body portion 55, a fixing screw 57 screwed into one side of the first clamping portion 56, a guide portion 58 erected on the first main body portion 55, a substantially U-shaped vertical position adjustment member 59 provided so as to overlap the guide portion 58 from the front side, and a second clamping portion 60 extending from the upper part of the vertical position adjustment member 59.

[0015] The first main body portion 55 is formed in the shape of a rectangular, slightly thick plate, and its bottom surface is provided with a bottom portion 61 for contacting the upper part of the lower projection 54.

[0016] The first clamping portion 56 consists of two plate bodies 56a that hang down from both sides of the first main body portion 55 and are spaced apart by a predetermined distance, and each plate body 56a is fixed by a screw 62 that is screwed into the first main body portion 55. The first clamping portion 56 is the part that clamps the upper part of the lower projection 54.

[0017] The fixing screw 57 is screwed into one side of the first clamping portion 56 and protrudes from the opposite side. By screwing in the fixing screw 57, it serves to maintain the clamped state of the lower projection 54 that is clamped by the first clamping portion 56 in a fixed state.

[0018] The guide section 58 is formed in a rectangular, thick box shape and is installed upright on the first main body section 55. A vertical position adjustment screw 63 is screwed onto the front side of the guide section 58. The function of the vertical position adjustment screw 63 will be explained below.

[0019] The vertical position adjustment member 59 is formed in a roughly U-shape and is provided so as to overlap the guide portion 58 from the front side, and is capable of vertical movement relative to the guide portion 58 (see arrow A). Furthermore, the vertical position adjustment member 59 has an elongated hole 64 into which the vertical position adjustment screw 63 is inserted. In other words, the vertical position adjustment member 59 can be adjusted by moving up and down along the elongated hole 64 into which the vertical position adjustment screw 63 is inserted (see arrow A), and the vertical position adjustment screw 63 can be screwed into the adjusted vertical position to maintain it in a fixed state. Furthermore, it is provided with a first stopper surface 65 for contacting the lower part of the upper projection 53.

[0020] The second clamping portion 60 extends from the upper parts on both sides of the vertical position adjustment member 59 and consists of two clamping pieces 60a spaced apart by a predetermined interval. The second clamping portion 60 is the part that clamps the lower part of the upper projection 53.

[0021] As shown in Figures 5 to 7, the lower fall prevention member 51b comprises a magnet portion 66, a second main body portion 67 on which the magnet portion 66 is provided, an extension portion 68 erected on the second main body portion 67, and a third clamping portion 69 provided on the extension portion 68.

[0022] The magnet section 66 is formed in a box shape and is designed to be magnetically attached to and detached from the steel frame section 52 by turning the switch 70 on and off.

[0023] The second main body 67 is formed in the shape of a rectangular plate, and a magnet portion 66 is provided on the lower side.

[0024] The extension portion 68 is formed in a rectangular, slightly thick box shape, erected on the upper side of the second main body portion 67, and fixed by screws 73 threaded from the second main body portion 67. It also has a second stopper surface 71 for contacting the lower part of the lower projection 54. A hole 72 is provided in the central part of the extension portion 68 to reduce the weight.

[0025] The third clamping portion 69 is provided on the upper sides of the extension portion 68 and consists of two clamping pieces 69a spaced apart by a predetermined interval. The third clamping portion 69 is the part that clamps the lower part of the lower projection 54.

[0026] Next, the procedure for attaching the fall prevention jig 51 (upper fall prevention member 51a and lower fall prevention member 51b) to the upper projection 53 and the lower projection 54 will be explained. First, the procedure for attaching the upper fall prevention member 51a to the upper projection 53 and the lower projection 54 will be explained. As shown in Figure 8, the bottom 61 of the upper fall prevention member 51a is brought into contact with the upper part of the lower projection 54, the first clamping portion 56 is clamped onto the lower projection 54, and then the fixing screw 57 is tightened to maintain the clamped state of the first clamping portion 56 in a fixed state.

[0027] Then, the vertical position adjustment screw 63 is loosened to adjust the vertical position of the vertical position adjustment member 59, bringing the first stopper surface 65 into contact with the lower part of the upper projection 53. Furthermore, the vertical position adjustment screw 63 is tightened to maintain the vertical position of the vertical position adjustment member 59 in a fixed state. In this way, the upper fall prevention member 51a is attached to the upper projection 53 and the lower projection 54.

[0028] Next, the procedure for attaching the lower fall prevention member 51b to the lower projection 54 will be explained. As shown in Figure 8, the second stopper surface 71 of the lower fall prevention member 51b is brought into contact with the lower part of the lower projection 54. Then, the magnet part 66 is brought into contact with the steel frame part 52, and the switch 70 is turned on to magnetically attach the magnet part 66 to the steel frame part 52. In this way, the lower fall prevention member 51b is attached to the lower projection 54.

[0029] In Figure 8, the upper fall prevention member 51a and the lower fall prevention member 51b are attached together to the upper projection 53 and the lower projection 54, and in this state (the state in Figure 8), it is possible to sequentially perform cutting work using the cutting machine 21. However, in some cases, as shown in Figures 12 to 15, it is also possible to perform the installation work of the upper fall prevention member 51a and the lower fall prevention member 51b separately, and to perform the cutting work of the upper projection 53 and the lower projection 54 separately.

[0030] Next, we will describe the cutting machine 21 that cuts the upper projection 53 and the lower projection 54 that are attached to the steel frame 52. As shown in Figures 9 to 11, the cutting machine 21 consists of a magnetic mounting jig 22 for mounting guides and the cutting machine body 23.

[0031] As shown in Figures 9 and 10, the mounting jig 22 includes a magnetic front mounting portion 26 that can be detachably attached to the steel portion 52, and a connecting portion 27 adjacent to the front mounting portion 26. The front mounting section 26 is box-shaped and has a powerful magnetic attachment section 28 at its bottom, allowing it to be strongly magnetically attached to or detached from the steel section 52 by turning the lock handle 29 ON / OFF. A pair of positioning frames 31 are provided on both sides of the connecting portion 27, and the positioning frames 31 have locking recesses 32 formed therein. The positioning frames 31 can be adjusted along the elongated holes 31a by tightening and loosening bolts 33, and the position of the locking recesses 32 can be adjusted.

[0032] As shown in Figures 9 to 11, the cutting machine body 23 includes a locking bar 35 that rotatably locks into a locking recess 32 of the mounting jig 22, front support columns 36 provided at both ends of the locking bar 35, a pair of powerful magnetic rear mounting parts 37 that are detachably magnetically attached to the steel part 52, rear support columns 38 provided on each rear mounting part 37, a rear horizontal plate 49 provided between each rear support column 38, a movable guide rail 39 provided between the front support column 36 and the rear support column 38, and a movable guide rail The system includes a guide holder 40 that is movable along a 39, a mounting base plate 41 connected to the guide holder 40 and having a cutting opening 50 (see Figure 11) in the center through which protrusions 53 and 54 pass, a drive motor 42 provided on the mounting base plate 41, a drive roller 43 provided on the mounting base plate 41 that is driven in conjunction with the drive motor 42, a pair of driven rollers 44 provided on the mounting base plate 41 opposite the drive rollers 43, and a band saw 45 that rotates with respect to the driven rollers 44 and the drive rollers 43. In Figures 9 and 10, reference numeral 47 indicates a movable auxiliary rail, and reference numeral 48 in Figure 9 indicates a front cross plate.

[0033] The locking bar 35 is formed in a cylindrical shape of a predetermined length, and a locking groove 46 is formed in the middle of it that fits into the locking recess 32 (see Figure 9).

[0034] The rear mounting sections 37 are provided on both sides of the rear of the cutting machine body 23, are box-shaped, and have powerful magnets. They can be firmly attached to or detached from the steel section 52 by turning the switch 37a ON / OFF. Furthermore, each rear mounting section 37 is provided with a rear support column 38 (see Figures 9 and 10). A rear cross plate 49 is provided spanning between each rear support column 38 (see Figure 9).

[0035] The movable guide rail 39 is provided between the front support column 36 and the rear support column 38, and a guide holder 40 that can move along the movable guide rail 39 is attached to it.

[0036] The guide holder 40 is formed to clamp the movable guide rail 39, and is designed to move (descend) by sliding along the movable guide rail 39. The guide holder 40 is also connected to the mounting base plate 41.

[0037] The mounting base plate 41 is formed to a predetermined size, and both sides of the mounting base plate 41 are connected to the guide holder 40. The mounting base plate 41 descends along the movable guide rail 39 due to its own weight, and the cutting opening 50 of the mounting base plate 41 passes through the protrusions 53 and 54, allowing the band saw 45 to cut the protrusions 53 and 54. In other words, a cutting opening 50 is formed in the center of the mounting substrate 41 for the protrusions 53 and 54 to pass through (see Figure 11).

[0038] As shown in Figure 11, the cutting opening 50 has a vertically formed edge 50a. Therefore, it can cut through vertically protruding projections 53 and 54.

[0039] The drive motor 42 is mounted on the mounting board 41, and is driven and stopped by the ON / OFF operation of the switch 42a.

[0040] The drive roller 43 is designed to be driven in conjunction with the drive motor 42 and is mounted on the mounting base plate 41. The drive roller 43 is made up of a pulley that is larger than the driven roller 44, and a rotating band saw 45 is wrapped around it to transmit power to the driven roller 44.

[0041] The driven roller 44 is mounted on the mounting base plate 41 opposite the drive roller 43. The driven roller 44 and the drive roller 43 are positioned such that the band saw 45 is perpendicular to the protrusions 53 and 54.

[0042] The band saw 45 is a wire-type rotary cutter that rotates at high speed via a drive roller 43 and a driven roller 44.

[0043] Next, the process of sequentially cutting the upper projection 53 and the lower projection 54, to which the upper fall prevention member 51a or upper fall prevention member 51b is attached, using the cutting machine 21 will be described over time. First, Figure 12 is a side view of the upper projection 53 being cut by the cutting machine, and Figure 13 is a side view of the upper projection 53 after it has been cut. Figure 14 is a side view of the lower projection 54 being cut by the cutting machine, and Figure 15 is a side view of the lower projection 54 after it has been cut. In each figure, reference numeral 74 indicates the weld bead.

[0044] As shown in Figure 12, the mounting base plate 41 descends along the moving guide rail 39 due to its own weight, the cutting opening 50 (see Figure 11) passes over the projection 53, and the band saw 45 cuts the upper projection 53. As shown in Figure 13, once the upper projection 53 has been cut off, the presence of the upper fall prevention member 51a keeps the upper projection 53 in a clamped state and prevents it from falling.

[0045] As shown in Figure 14, the mounting base plate 41 descends along the moving guide rail 39 due to its own weight, the cutting opening 50 (see Figure 11) passes over the projection 54, and the band saw 45 cuts the lower projection 54. As shown in Figure 15, once the lower projection 54 has been cut, the lower fall prevention member 51b holds the lower projection 54 in place and is magnetically attached to the steel frame 52, so it will not fall.

[0046] Figures 12 to 15 illustrate the process of separately installing the upper fall prevention member 51a and the lower fall prevention member 51b, and separately cutting the upper projection 53 and the lower projection 54. However, in some cases, as shown in Figure 8, the upper fall prevention member 51a and the lower fall prevention member 51b may be attached together to the upper projection 53 and the lower projection 54, and the cutting operation may be performed sequentially using the cutting machine 21 in this state.

[0047] As described above, the jig 51 for preventing the protrusion from falling prevents the upper protrusion 53 from falling when the upper protrusion 53 is cut, because the upper fall prevention member 51a holds the upper protrusion 53 and the lower protrusion 54 in a connected state by clamping them together. Furthermore, when cutting the lower projection 54, the lower projection 54 is held in place by the lower fall prevention member 51b, which is magnetically attached to the steel frame 52, and therefore does not fall. Therefore, accidents involving the falling of the upper protrusion 53 and the lower protrusion 54 can be prevented, thus improving safety. [Explanation of symbols]

[0048] 1 cutting machine 2 Mounting part 3 Rail guide posts 4. Guide rails for movement 5. Mobile roller 6 Cutting opening 7 Mounting board 8 Drive motor 9 Drive rollers 10 Driven rollers 11 Bandsaw 12 Steel columns 13 Projection (object to be cut) 21 Cutting machine 22 Mounting jig 23 Cutting machine body 24 Steel columns 26 Front mounting section 27 Connection part 28 Magnetized part 29 Lock handle 30 Stoppers 31 Positioning frame 31a long hole 32 Recess for locking 33 volts 35 Locking bar 36 Front support column 37 Rear mounting section 37a switch 38 Rear support 39. Guide rail for movement 40 Guide Holder 41 Mounting board 42 Drive motor 42a switch 43 Drive rollers 44 Driven roller 45 Bandsaw 46 Locking groove 47. Auxiliary rail for movement 48 Front transverse plate 49 Rear transverse plate 50 cutting opening 50a Edge 51. Fixture to prevent protrusions from falling. 51a Upper fall prevention member 51b Lower fall prevention member 52 Steel frame section 53 Upper protrusion (erection piece) 54 Lower protrusion (erection piece) 55 First main body 56 1st clamping part 56a plate 57 Fixing screws 58 Guide section 59 Vertical position adjustment member 60 Second clamping part 60a clamping piece 61 Bottom 62 screws 63. Vertical position adjustment screw 64 long hole 65 First stopper surface 66 Magnet section 67 Second Main Body 68 Extension 69 Third clamping part 69a Clamping piece 70 switches 71 Second stopper surface 72 Hole 73 screws 74 Weld Bead

Claims

1. A fall prevention jig for preventing the cut upper and lower protrusions from falling when sequentially cutting upper and lower protrusions that are attached at predetermined intervals to the steel frame of a steel column or steel frame material to be erected using a cutting machine, The fall prevention jig is, An upper fall prevention member that holds and connects the upper and lower protrusions, respectively, It consists of a lower fall prevention member that clamps the lower projection and is magnetically attachable to and detachable from the steel frame. A jig for preventing cut protrusions from falling, characterized by the following features.

2. The aforementioned upper fall prevention member is The first main body portion includes a bottom portion for contacting the upper part of the lower projection, The first clamping portion consists of two pieces spaced apart from the first main body that hang down and clamp the upper part of the lower projection, A fixing screw is screwed into one side of the first clamping portion and maintains the clamped state of the lower projection that is clamped by the first clamping portion in a fixed state, A box-shaped guide section is erected on the first main body, and a vertical position adjustment screw is screwed into the front side of the box-shaped guide section, A vertical position adjustment member is provided, which can be adjusted vertically by moving up and down relative to the guide portion, can maintain the adjusted vertical position in a fixed state with the vertical position adjustment screw, has an elongated hole into which the vertical position adjustment screw is inserted, and has a first stopper surface for contacting the lower part of the upper projection, The vertical position adjustment member extends from the upper part and comprises a second clamping portion consisting of two pieces spaced apart at a predetermined distance from each other, which clamps the lower part of the upper projection. The lower fall prevention member is A magnet part that can be magnetically attached to and detached from the steel frame by switching it on and off, The second main body portion on which the magnet portion is provided, A box-shaped extension is erected on the second main body and has a second stopper surface for contacting the lower part of the lower projection, The extension portion is provided with a third clamping portion consisting of two pieces spaced apart at a predetermined distance from each other, which clamps the upper part of the lower projection. A jig for preventing the falling of a cut protrusion, as described in claim 1, characterized by the above.

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