Hanging jig for suspended scaffolding

Abstract

To provide a suspending jig for a hanging scaffold that can easily and quickly suspend a high safety hanging scaffold.SOLUTION: A suspending jig 1 for a hanging scaffold suspending a hanging scaffold 4 held between two beams provided in parallel comprises: a shaft body 5 where a shaft center is placed in parallel with a longer direction of the beam between two bridge girders 2, 2; a pair of supporting materials 6, 6 where one ends 6a are rotatably coupled to the shaft body 5, and other ends 6b extend respectively from the shaft body 5 to the opposite direction and abutted respectively to wall surfaces 2a, 2a opposed to each other of the two bridge girders 2, 2; and a holding part 7 mounted on the shaft body 5 to hold a chain 3 suspending the hanging scaffold 4. In the pair of supporting materials 6, 6, the other ends 6b abutted respectively to each wall surface 2a, 2a of the two bridge girders are located at lower position than that of the one ends 6a coupled to the shaft body 5 in the state that the hanging scaffold 4 is not suspended.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a hanging jig for hanging suspended scaffolding used in construction and repair work of elevated expressways, bridges, etc. [Background technology]

[0002] Generally, suspended scaffolding is made up of multiple scaffolding boards connected in a horizontal direction. There are known types of scaffolding boards, such as panel type, lattice assembly type, and frame type, but the scaffolding boards are usually held in place by being suspended by chains from the girders of elevated expressways, bridges, etc. (See, for example, Patent Document 1).

[0003] That is, if the bridge girder is made of steel, the upper end of the chain is fixed using a steel frame clamp, and if the bridge girder is made of concrete, a hole is drilled in the concrete and a hole-in anchor is attached, and the upper end of the chain is fixed to this anchor. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6685630 Summary of the Invention [Problem to be solved by the invention]

[0005] The suspension method using the above-mentioned steel frame clamps or hole-in anchors for concrete makes it difficult to suspend a suspended scaffolding easily and quickly. On the other hand, since suspended scaffolding is installed at high places such as bridge girders, safety is also required.

[0006] An object of the present invention is to provide a suspension jig for a suspended scaffold that can easily and quickly suspend a highly safe suspended scaffold. [Means for solving the problem]

[0007] The hanging jig for suspended scaffolding of the present invention is used to suspend suspended scaffolding held between two juxtaposed girders, and comprises a shaft disposed between the two girders with its axis parallel to the longitudinal direction of the girders, a pair of supports having one end rotatably connected to the shaft and the other ends extending in opposite directions from the shaft to abut against opposing wall surfaces of the two girders, and a holding section attached to the shaft or the pair of supports near the shaft to hold a suspender that suspends the suspended scaffolding. When the suspended scaffolding is not suspended, the other ends of the pair of supports that abut against the wall surfaces of the two girders are lower than the one ends connected to the shaft. [Effects of the Invention]

[0008] According to the present invention, one end of each of the pair of supports is inclined in a mountain shape from the shaft to which it is rotatably connected, and the other end abuts the wall surface of the girder. Therefore, when the suspended scaffolding is suspended by the holding part, the weight of the suspended scaffolding exerts a force that presses the other ends of the pair of supports firmly against the wall surfaces of the two girders. As a result, the suspended scaffolding can be installed easily, quickly, and reliably with almost one touch, and is also highly safe. Furthermore, if the girder is made of concrete or the like, there is no need to drill holes or otherwise damage the girder, and the scaffolding is not disposable but can be used repeatedly. Furthermore, when the support material is made of a single pipe, the jig itself becomes lightweight, which makes it easy to transport and work with, and it is also convenient to use. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is an explanatory diagram showing a state in which a hanging jig according to an embodiment of the present invention is used. [Figure 2] 10(a) and 10(b) are a side view and a plan view showing the use of a center adjuster located in the center of the hanging jig. [Figure 3] 3A is a front view showing the center adjuster of FIG. 2, FIG. 3B is a left side view of FIG. 3A, and FIG. 3C is a right side view of FIG. 3A. [Figure 4] FIG. [Figure 5] 1(a) and 1(b) are a front view and a cross-sectional view taken along line AA, showing a holding portion attached to a center adjuster. [Figure 6] 1(a) and 1(b) are a front view and a side view showing the shaft body. [Figure 7] 1(a) and 1(b) are a plan view and a side view showing a state in which a side adjuster is used according to one embodiment of the present invention. [Figure 8] 1A is a front view showing the length adjusting member of the side adjuster, FIG. 1B is a left side view of FIG. 1A, and FIG. 1C is a right side view of FIG. [Figure 9] 10(a) and 10(b) are a plan view and a cross-sectional view taken along line BB showing the contact portion at the tip of the side adjuster. [Figure 10] 10(a) and 10(b) are a front view and a side view showing a pin for connecting a side adjuster and a contact portion. [Figure 11] 10(a) and 10(b) are explanatory diagrams showing the function of a rotation stopper provided at the contact portion. [Figure 12] 10(a) and 10(b) are a plan view and a side view showing another example of a side adjuster. [Figure 13] 13 is a perspective view showing a length adjusting member in the side adjuster shown in FIG. 12. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0010] An embodiment of the present invention will now be described in detail with reference to the drawings, in which: Figure 1 is an explanatory diagram showing a state in which a hanging jig 1 of this embodiment is used.

[0011] As shown in FIG. 1, a hanging jig 1 is held between two juxtaposed bridge girders 2, 2 of an elevated expressway, a bridge, etc., and hangs a hanging scaffolding 4 with a chain 3 (hanging device). The hanging jig 1 comprises an axle 5 arranged between two bridge girders 2, 2, a pair of supports 6, 6 having one end 6a rotatably connected to the axle 5 and the other end 6b abutting against the opposing wall surfaces 2a, 2a of the bridge girders 2, 2, respectively, and a holding part 7 attached to the axle 5 and holding the upper end of a chain 3 that suspends the suspended scaffolding 4.

[0012] In Figure 1, the supports 6, 6 shown by dashed dotted lines indicate the position before the suspended scaffolding 4 is suspended, i.e., when no load is being applied to the suspended scaffolding 4, and the pair of supports 6, 6 are inclined in a mountain shape so that the other end 6b, which abuts against each of the wall surfaces 2a, 2a of the two bridge girders 2, 2, is lower than the one end 6a connected to the shaft 5. In this state, when the suspended scaffolding 4 is suspended by the chain 3 from the holding part 7, the load of the suspended scaffolding 4 causes the center of the supports 6, 6 to descend, as shown by solid lines, and both ends (other ends 6b, 6b) to spread apart and be pressed firmly against the wall surfaces 2a, 2a of the bridge girders 2, 2. This allows the suspended scaffolding 4 to be held safely.

[0013] 2(a) and 2(b) are a front view and a plan view showing the central portion of the hanging jig 1. As shown in FIGS. 2(a) and 2(b), the shaft body 5 is disposed so that its axis is parallel to the longitudinal direction of the bridge girders 2, 2, and one ends 6a, 6a of a pair of support members 6, 6 are rotatably connected to this shaft body 5. In other words, the pair of support members 6, 6 are rotatably connected to each other via the shaft body 5.

[0014] There are no particular limitations on the support members 6, 6, and rod-shaped or plate-shaped members can be used, but in this embodiment, a cylindrical single pipe such as a metal pipe is used from the viewpoint of weight reduction. Center adjusters 8, 8 that can adjust the length of protrusion from the supports 6, 6 are attached to one ends 6a, 6a of the pair of supports 6, 6, and the center adjusters 8, 8 are rotatably attached to the shaft body 5. Each center adjuster 8 has a plurality of through holes 10 formed along the longitudinal direction of the support 6, and the length of protrusion from each support 6 is adjusted and attached by inserting a fixing pin 9. By providing such center adjusters 8, it becomes possible to adjust the length of the hanging jig 1 according to the spacing between the bridge girders 2, 2, eliminating the need to prepare hanging jigs 1 of different lengths for each spacing between the bridge girders 2, 2. The center adjuster 8 does not have to be attached to both of the pair of support members 6, 6, but may be attached to one end 6a of at least one of them.

[0015] The length adjustment mechanism of the center adjuster 8 will be described below. FIG. 3(a) is a front view of the center adjuster 8, FIG. 3(b) is a left side view of FIG. 3(a), and FIG. 3(c) is a right side view of FIG. 3(a), and FIG. 4 is an exploded perspective view of the center adjuster. The center adjuster 8 includes a cylindrical body 81 having a plurality of insertion holes 10 arranged side by side in the axial direction, and a plate-like body 82. The plate-like body 82 has a main body 82a inserted into the cylindrical body 81 and a head 82b having a through-hole 11. When the plate-like body 82 is inserted into the cylindrical body 81, cylindrical members 12 are provided at positions corresponding to the insertion holes 10 of the cylindrical body 81, passing perpendicularly through the plate-like body 82, and are fixed by welding (see FIGS. 3(b) and 3(c)). When inserted into the cylindrical body 81, it is preferable that the chamfered edges of both ends of the cylindrical member 12 abut against the inner surface of the cylindrical body 81. As shown in Figures 3(b) and (c), the plate-like body 82 is positioned off-center from the cylindrical body 81. This is because, as shown in Figure 2(b), the heads 82b of the plate-like body 82 of the center adjuster 8 attached to one end of each of the pair of supports 6, 6 are overlapped via the retaining portion 7, and the shaft 5 is inserted through them. Therefore, in Figures 3(b) and (c), it is preferable that the length from the line segment L passing through the center of the cylindrical body 81 to the plate-like body 82 is equal to the length obtained by dividing the thickness of the retaining portion 7 into two equal parts.

[0016] As shown in FIG. 4, the center adjuster 8 is constructed by inserting the main body 82a of the plate-shaped body 82 into the cylindrical body 81, and then welding the inner peripheral surface of the cylindrical body 81 to the wall surface 821a of the main body 82a of the plate-shaped body 82 using the welding holes 13 provided in the cylindrical body 81, thereby fixing the two together. As shown in Figures 2(a) and (b), the center adjuster 8 assembled in this manner is assembled by inserting the cylindrical body 81 into one end of the support material 6, aligning the insertion hole 10 with the hole 14 provided in the support material 6 that has the appropriate protruding length to match the spacing between the bridge girders 2, 2, and inserting the fixing pin 9.

[0017] To connect a pair of support members 6 to each other so that they can rotate freely, the heads 82b of the center adjusters 8 of each support member 6 are overlapped with the holding portion 7 interposed therebetween, and the shaft 5 is inserted through them. As shown in Figures 5(a) and (b), the holding portion 7 has an insertion hole 71 through which the shaft 5 is inserted, and is formed with a ring portion 72 at the bottom for attaching the chain 3. Note that the ring portion 72 may be replaced with a hook-shaped portion. Furthermore, holes 73 are formed on both sides of the upper portion of the holding portion 7 to connect one end of a spring material 15, which will be described later.

[0018] 6(a) and 6(b), a flange portion 51 that acts as a stopper for engaging with the head portion 82 is fixed to one end, and a pin insertion hole 52 is formed at the other end. As described above, the shaft 5 is inserted from the other end through the through hole 11, the insertion hole 71 of the holding portion 7, and the through hole 11 in that order, with the head portion 82b of the center adjuster 8 of each support material 6 overlapping via the holding portion 7, and a pin (not shown) is inserted through the pin insertion hole 52 to connect the center adjusters 8 of each support material 6.

[0019] Returning to Figure 2, a nut 16 is fixed by welding or the like to the upper part near one end of each support member 6, 6, and a bolt 17 is screwed into this nut 16. A spring material 15 is suspended between this bolt 17 and a hole 73 provided in the holding portion 7. The pair of support members 6, 6 are biased by this spring material 15 in a direction that rotates them upward, so that the other ends 6b, 6b of the support members 6, 6 press against the wall surfaces 2a, 2a of the two bridge girders 2, 2. In this way, the pressing force against the wall surfaces 2a, 2a is prevented from decreasing over time.

[0020] As shown in Figures 7(a) and (b), side adjusters 19, 19 are attached to the other ends 6b of the pair of supports 6, 6, respectively, and the protruding length from the supports 6, 6 can be adjusted. Each other end 6b abuts against the opposing wall surfaces 2a of the bridge girder 2 via the side adjuster 19.

[0021] 8(a) to 8(c), the side adjuster 19 includes a cylindrical body 191 having a plurality of insertion holes 10' arranged side by side in the axial direction, and a plate-like body 192 having a main body 192a to be inserted into the cylindrical body 191 and a head portion 192b having a through-hole 20. Furthermore, when the plate-like body 192 is inserted into the cylindrical body 191, cylindrical members 21 that penetrate the plate-like body 192 perpendicularly are provided at positions corresponding to the insertion holes 10 of the cylindrical body 191, and are fixed by welding.

[0022] The side adjuster 19 is made by inserting the main body 192a of the plate-like body 192 into the cylindrical body 191, and then using the welding holes 13' provided in the cylindrical body 191, welding the inner surface of the cylindrical body 191 to the wall surface of the main body 192a of the plate-like body 192 to fix them together. As shown in Figures 7(a) and (b), the side adjuster 19 assembled in this manner is assembled by inserting the cylindrical body 191 into the other end 6b of the support material 6, aligning the insertion holes 10, 10' with the appropriate protruding length among the multiple insertion holes 10' to match the spacing between the bridge girders 2, 2 with the hole 14' provided in the support material 6, and inserting the fixing pin 9.

[0023] In this way, the side adjuster 19 has almost the same configuration as the center adjuster 8, but differs from the center adjuster 8 in that the plate-like body 82 is located at the center of the cylindrical body 81, as shown in Figures 8(b) and (c). This is because the side adjuster 19 does not have the retaining portion 7 as the center adjuster 8 does.

[0024] The side adjuster 19 also has a contact portion 22 at its tip that contacts the wall surface 2a of the bridge girder 2. The contact portion 22 has an anti-slip material 24 such as elastic rubber attached to the surface that contacts the wall surface 2a. This prevents the side adjuster 19 from slipping and also prevents the wall surface 2a of the bridge girder 2 from being damaged.

[0025] Fig. 9(a) is a plan view showing the contact portion 22, and Fig. 9(b) is a cross-sectional view taken along line BB. As shown in Fig. 9(a), the contact portion 22 has a slit 23 in the center. This slit 23 is for inserting the head 192b of the side adjuster 19. As shown in Fig. 9(b), the contact portion 22 has a bent portion 22a bent into a substantially U-shape in cross section, a cylindrical body 22b fixed in the bent portion 22a by welding 24, and an anti-slip material attachment portion 22c provided at the tip of the bent portion 22a for attaching the anti-slip material 24. In Fig. 9(a), reference numeral 13'' denotes a welding hole for performing welding 29. The cylindrical body 22b is fixed inside the bent portion 22a except for the portion of the slit 23. The bent portion 22a is made of an extruded aluminum material, and the non-slip material 24 is fixed to the bent portion 22a by welding 29.

[0026] 10 shows a shaft 25 for connecting the contact portion 22 to the side adjuster 19. A washer 26 serving as a stopper is fixed to one end of the shaft 25 by welding or the like, and a through hole 27 for inserting a pin is formed in the other end. That is, to connect abutment portion 22 to side adjuster 19, head 192a of plate-like body 192 at the tip of side adjuster 19 is inserted into slit 23 of abutment portion 22, through hole 20 of head 192a is aligned with the opening of cylindrical body 22, shaft body 25 is inserted into cylindrical body 22, and a pin (not shown) is inserted into through hole 27 for attachment.

[0027] With this type of connection method, the abutment portion 22 can freely rotate vertically relative to the side adjuster 19, so as shown in Figure 11(a), the anti-slip material mounting portion 22c of the abutment portion 22 may face downward, making it difficult to abut against the wall surface 2a of the bridge girder 2. 11(b), the abutment portion 22 has a rotation stopper 28 to prevent the anti-slip material mounting portion 22c from rotating downward. This allows the support material 6 to be easily pressed against the wall surface 2a of the bridge girder 2 after the length of the support material 6 has been adjusted with the center adjuster 8 and / or side adjuster 19, improving work efficiency.

[0028] Next, another example of a side adjuster according to the present invention will be described with reference to Figures 12 and 13. Note that the same members as those in the above embodiment are given the same reference numerals and their description will be omitted.

[0029] 12(a) and (b), a head 192b' protruding from a cylindrical body 191 at its tip is not plate-shaped, but is formed in a U-shape in plan view, with a through-hole 20' formed in each piece (see FIG. 13). Then, the abutment portion 22 is inserted into the U-shaped head 192b', and the shaft 25 is inserted through both through-holes 20' and the abutment portions 22. The rest is the same as in the above embodiment.

[0030] As described above in detail, the hanging jig 1 of the present invention is designed to suspend the suspended scaffolding 4 by pressing against the wall surfaces 2a, 2a of the bridge girders 2, 2, but with hanging jigs such as tension rods, there is a problem that they become loose after being suspended for a long period of time, making them less safe.In contrast, the hanging jig 1 of the present invention has a pair of supports 6, 6 that are inclined in a mountain shape, so that the pressing force does not decrease over a long period of time due to the spring material 15 at the time of installation, and due to the load of the suspended scaffolding 4 being applied after installation.

[0031] The suspended scaffolding 4 suspended by the suspension jig 1 of the present invention is not particularly limited, and for example, scaffolding using panel type, lattice assembly type, frame type, or other scaffolding boards can be used.

[0032] Although the embodiments of the present invention have been described above, the hanging jig of the present invention is not limited to the above embodiments and various modifications and improvements are possible. For example, only one of the center adjuster 8 and the side adjuster 19, 19' may be provided. Also, while the center adjuster 8 and the side adjuster 19, 19' are provided on each of the pair of supports 6, 6, they may be provided on only one of the supports 6. [Explanation of symbols]

[0033] 1 Hanging jig 2 Bridge girders (girders) 2a Wall 3 Chain (hanging device) 4. Suspended scaffolding 5-axis body 51 Flange 52 Pin insertion hole 6 Support material 6a one end 6b other end 7 Holding part 71 Insertion hole 72 Ring section 73 holes 8 Center adjuster 81 Cylinder 82 Plate-shaped body 82a main body 82b Head 9 Fixing pin 10, 10´ insertion holes 11 Through hole 12 Cylindrical body 13, 13´ Welding holes 14, 14 holes 15 Spring material 16 Nut 17 volts 19, 19´ Side Adjuster 191 Cylinder 192 Plate-shaped body 192a main body 192b Head 20, 20´ through holes 21 Cylinder member 22 Contact part 22a Bend part 22b Cylinder 22c Anti-slip material attachment part 23 Slit 24 Anti-slip material 25 shaft body 26 Washer 27 Through hole 28 Rotation stopper 29 Welding

Claims

1. A hanging jig for hanging a suspended scaffolding, which is held between two girders arranged side by side, A shaft body disposed between the two girders, the shaft center of which is parallel to the longitudinal direction of the girders; a pair of support members each having one end rotatably connected to the shaft body and the other end extending in opposite directions from the shaft body and abutting against opposing wall surfaces of the two girders; A holding portion attached to the shaft body or the pair of supports near the shaft body and holding a hanging tool for hanging the suspended scaffolding, A hanging jig for a suspended scaffolding, characterized in that when the suspended scaffolding is not suspended, the pair of support members are inclined in a mountain shape so that the other ends that abut against the wall surfaces of the two girders are at a lower position than the one ends connected to the shaft body.

2. The suspension jig according to claim 1 , wherein the pair of support members are biased by spring members in a direction of upward rotation so that the other ends press against the wall surfaces of the two beams, respectively.

3. 3. The suspension jig according to claim 2, wherein the holding portion is rotatably attached to the shaft body and has a mounting hole to which one end of the spring material is attached, the other end of the spring material being attached to the support material.

4. 4. The suspension jig according to claim 1, wherein a center adjuster is attached to the one end of at least one of the pair of support members, the center adjuster being rotatably attached to the shaft, the center adjuster being adjustable in length of protrusion from the support member.

5. 5. The hanging jig according to claim 4, wherein the center adjuster is attached to each of the pair of support members, and the shaft is inserted through an opening formed in the center adjuster and an opening formed in the holding portion, thereby rotatably holding the center adjuster and the holding portion.

6. 4. The suspension jig according to claim 1, wherein a side adjuster capable of adjusting a protruding length from the support is attached to the other end of the pair of support materials, and the other end abuts against opposing wall surfaces of the two girders via the side adjuster.

7. The suspension jig according to claim 6, wherein the side adjuster has a contact portion that contacts a wall surface of the beam, and the contact portion is provided with an anti-slip material for preventing slipping against the wall surface.

8. 8. The suspension jig according to claim 7, wherein the contact portion of the side adjuster is rotatable in a vertical direction relative to the support material, and the contact portion has a rotation stopper to prevent downward rotation.

9. 4. The suspension jig according to claim 1, wherein the pair of support members are single pipes.

10. A suspended scaffolding device comprising: a suspension jig according to any one of claims 1 to 3; a suspended scaffolding located below the suspension jig; and a suspension tool connecting the suspension jig and the suspended scaffolding.

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