JP3193867U - Scaffolding chain and suspension scaffold using the same - Google Patents

Abstract

[PROBLEMS] To provide a scaffold suspension chain capable of remarkably improving the work efficiency of construction work of a suspended scaffold by making it possible to suspend one place suspended from the scaffold suspension chain with one scaffold suspension chain. Providing a suspension scaffold using A scaffold suspension chain comprising a chain, a first hook provided at one end of the chain, and a second hook provided at the other end of the chain, the scaffold suspension chain The permissible load for one single suspension was set to 430 kg or more. [Selection] Figure 1

Description

  The present invention relates to a scaffold suspension chain in which an allowable load for one suspension is set to 430 kg or more and a suspension scaffold using the same.

  As scaffolds for painting and repairing large structures such as bridges, suspension scaffolds in which scaffolds are supported in a suspended state by a scaffold suspension chain are widely implemented.

  As the scaffold suspension chain, one having a chain, a first hook provided at one end of the chain, and a second hook provided at the other end of the chain has been widely put into practical use (for example, Patent Documents). 1).

  Moreover, as a method of suspending a scaffold, loop suspension and single suspension are known. In the loop suspension, the chain is wound around a beam made of H-shaped steel or the like of the structure, and is also wound around a pipe of the scaffold, and the first hook at one end of the chain is engaged with the other end of the chain. This is a method of suspending a scaffold by wrapping a chain around a pipe in a loop shape. Further, the single suspension is such that the first hook is engaged with a piece fixed to the beam or a clamp for the suspension chain, or one end of the chain is wound around the beam, and the first hook is extended to the upper side of the chain. Engage the hook, fix one end of the chain to the beam, wrap the other end of the chain around the pipe of the scaffold, and attach the second hook to the lower part of the chain stretched between the beam and the pipe In this method, the other end of the chain is fixed to the beam, and the scaffold is suspended so that one chain portion is disposed between the beam and the pipe.

  On the other hand, as the suspension chain, one that has been certified by the temporary industry association is generally adopted. The temporary industry association considers 2/3 of the breaking strength 17.64kN (1.8t) as the guaranteed load and divides this value by a safety factor of 5, that is, the allowable load when one piece is suspended by 240kg (hereinafter referred to as the present load). In the invention, the permissible load certified by the temporary industry association is defined as the permissible permissible load), and 1.8 times the permissible permissible load for one suspension, that is, 430 kg is defined as the permissible permissible load for loop suspension. Yes. And the average breaking strength in five sampling tests is 17.64kN or more, and the minimum value is 15.68kN or more as the acceptance criterion, and the approved allowable load of one hanging is 240kg. It is certified that it is a scaffold suspension chain with a permissible load for loop suspension of 430 kg.

Utility Model Registration No. 3024747

  By the way, when looping a scaffold suspension chain, the work of wrapping the chain around the beam is a very complicated and dangerous work that is difficult to visually check at high places. For this, it is preferable to suspend one piece in which a first hook is engaged with a piece fixed to a beam or a clamp for a suspension chain. However, the temporary industry association currently has only one type of allowable load for 240kg suspension when hanging one scaffold suspension chain, and is necessary when using single suspension instead of loop suspension. In order to secure a sufficient allowable load, it is necessary to construct twice as many scaffold suspension chains, and even if one suspension method is adopted, the work efficiency cannot be improved sufficiently. It was.

  The purpose of the present invention is to make it possible to suspend one place with a single scaffold suspension chain so that the suspension suspension chain can be suspended in a loop, thereby significantly improving the work efficiency of the suspension scaffold construction work. It is to provide a chain and a suspension scaffold using the same.

  A scaffold suspension chain according to the present invention is a scaffold suspension chain comprising a chain, a first hook provided at one end of the chain, and a second hook provided at the other end of the chain, the scaffold suspension chain The permissible load for hanging one is set to 430 kg or more. In this specification, when it is simply referred to as “allowable load”, a calculation method similar to that of the temporary industry association, that is, 2/3 of the breaking strength of the scaffold suspension chain is regarded as a guaranteed load, and this value is a safety factor of 5 It means the value divided by.

  This scaffold suspension chain has a permissible load for single suspension of 430kg or more, and the temporary industry association has approved the permissible load for single suspension as 430kg. Because it is possible to hang one loop suspended with a scaffold suspension chain with a certified allowable load of 430kg with one scaffold suspension chain, there is no need to wrap the chain around the beam. The workability of the suspension chain can be improved. In addition, there is no need to increase the number of scaffold suspension chains, as in the case of replacing a conventional suspension suspension chain with a single suspension using a single suspension with an authorized allowable load of 240 kg. The work time required to construct the suspension scaffold can be greatly reduced.

  Here, by setting the wire diameter of the link of the chain to 6.5 mm to 8.0 mm, the allowable load for one suspension can be set to 430 kg or more. When the wire diameter of the link is less than 6.5 mm, it is necessary to use a metal material having high strength and rigidity in order to ensure sufficient strength, and there is a problem that the material cost is increased or the workability is lowered. Yes, if it exceeds 8.0 mm, it is possible to adopt a metal material that can be obtained at a low cost, but there is a problem that the weight of the scaffolding chain increases, so that the portability is lowered or the workability is lowered. It is preferable to set the distance between 0.5 mm and 8.0 mm.

  It is also preferable to make the first hook larger than the second hook. In this case, the assembly of the first hook to the structure can be improved by arranging the large first hook on the structure side.

  A suspension scaffold according to the present invention is a suspension scaffold in which a scaffold is suspended using the scaffold suspension chain, and the first hook is hooked on a suspension piece fixed to a structure or a suspension chain clamp, and the scaffold is suspended. One end of the suspension chain is fixed to the structure, and the second hook is hooked on the suspension ring of the scaffold, or the chain is wrapped around the pipe of the scaffold, and the middle part of the chain extends from the pipe to the structure. A second hook is hooked and fixed to the other end of the scaffold suspension chain to the scaffold.

  This suspension scaffold is a scaffold suspension chain in which the allowable load for one suspension is set to 430 kg or more. In the temporary industry association, the scaffold suspension chain in which the allowable load for a single suspension is certified to 430 kg is used. Because it is used, it is possible to hang one place with a single scaffold suspension chain using a scaffold suspension chain with a certified allowable load of 430kg for loop suspension. On the other hand, since there is no need to wrap the chain, the workability of the scaffold hanging chain can be improved. In addition, there is no need to increase the number of scaffold suspension chains, as in the case of replacing a conventional suspension suspension chain with a single suspension using a single suspension with an authorized allowable load of 240 kg. The work time required to construct the suspension scaffold can be greatly reduced.

  According to the scaffold suspension chain and the suspension scaffold using the same according to the present invention, the scaffold suspension chain in which the allowable load for one suspension is set to 430 kg or more. Since a scaffold suspension chain that has been approved for a single load of 430 kg is used, a single suspension suspension chain can be used to place a place where a loop suspension was used with a scaffold suspension chain with a certified allowable load of 430 kg. This makes it possible to suspend one chain, and it is not necessary to wrap the chain around the beam, so that the workability of the scaffold hanging chain can be improved. In addition, there is no need to increase the number of scaffold suspension chains, as in the case of replacing a conventional suspension suspension chain with a single suspension using a single suspension with an authorized allowable load of 240 kg. The work time required to construct the suspension scaffold can be greatly reduced.

Scaffolding chain (a) is a front view, (b) is a side view Exploded perspective view of first hook detachment prevention means Perspective view of hanging scaffold Front view of hanging scaffold Side view of mounting structure of first hook to beam

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a scaffold suspension chain 1 includes a chain 2, a first hook 10 provided at one end of the chain 2, and a second hook 20 provided at the other end of the chain 2. The allowable load for suspension is set to 430 kg or more, and the allowable load for single suspension is certified to 430 kg as a single item in the temporary industry association.

  As shown in FIG. 1, the chain 2 has a well-known configuration in which a plurality of links 2a are formed by bending a metal wire into an oval rounded rectangular shape and welding both ends thereof. The wire material D is set to 6.5 mm to 8.0 mm, and the metal material constituting the chain 2 is selected so that the allowable load for one suspension is 430 kg or more. When the wire diameter D of the link 2a is less than 6.5 mm, it is necessary to use a metal material with high strength and rigidity in order to ensure sufficient strength, which increases the material cost and decreases the workability. There is a problem, and if it exceeds 8.0 mm, it is possible to adopt a metal material that can be obtained at a low cost, but there is a problem that the weight of the scaffold suspension chain 1 is increased and the portability is lowered or the workability is lowered. Therefore, it is preferable to set to 6.5 mm or more and 8.0 mm or less. In the implementation product, a wire diameter D set to 7.0 mm was adopted.

  The major axis L1 and the minor axis L2 of the link 2a are set to be larger than the dimension capable of hooking the hook part 11a of the second hook 20.

(First hook)
The first hook 10 prevents the hook member 11 and the suspension member 3 including the suspension piece, the suspension ring, the link 2a of the chain 2 and the like that are hooked on the hook portion 11a of the hook body 11 from being detached from the hook portion 11a. The stopper means 15 is provided.

  The hook body 11 has an inverted J-shaped hook portion 11a, a mounting hole 11c provided in the proximal end portion 11b of the hook portion 11a, and a proximal end portion 11b of the hook portion 11a that protrudes toward the distal end portion 11d side of the hook portion 11a. The protrusion 11e provided in a shape and the pivotal support hole 11f provided at the tip of the protrusion 11e are made of a metal plate having a substantially uniform thickness.

  A holding space 12 for holding the suspension member 3 is formed in the hook portion 11a, and the suspension member 3 is introduced into the holding space 12 from the outside between the distal end portion 11d and the protruding portion 11e of the hook portion 11a. An opening 13 is formed.

  The hook body 11 is connected to a link 2 a at one end of the chain 2. Specifically, when manufacturing the link 2a arranged at one end of the chain 2, the metal wire is inserted into the mounting hole 11c of the hook body 11, and the metal wire is bent into an oval rounded rectangle. Then, both ends of the metal wire are welded to be connected to one end of the chain 2.

  The thickness t1 of the metal plate constituting the hook body 11 is set to 5.0 to 7.0 mm so that the allowable load when one scaffold suspension chain 1 is suspended is 430 kg or more. When the thickness t1 of the metal plate constituting the hook body 11 is less than 5.0 mm, it is necessary to use a metal material with high strength and rigidity in order to ensure sufficient strength, and the material cost increases. There is a problem that the workability is lowered, and if it exceeds 7.0 mm, a metal material that can be obtained at a low cost can be adopted. However, the weight of the scaffolding chain 1 increases, and the portability is lowered. Since there exists a problem that it falls, it is preferable to set to 5.0 mm or more and 7.0 mm or less. In the implementation product, a plate thickness t1 set to 6 mm was used.

  As shown in FIGS. 1 and 2, the anti-detachment means 15 is provided with a pivot pin 16 in the pivot hole 11 f of the hook body 11, and an opening 13 is opened and closed in the middle of the pivot pin 16. A possible stopper 17 is supported so as to be rotatable over a closed position indicated by a solid line in FIG. 1B and an open position indicated by an imaginary line in FIG. The pivot pin 16 supports a coil spring 18 that constantly urges the stopper 17 toward the closed position. As shown in FIG. 1B, the stopper 17 has a distal end portion 11d of the hook portion 11a. The inside of the holding space 12 is pressed against the inside of the holding space 12, and the opening 13 of the hook portion 11a is closed.

  In this detachment prevention means 15, when the suspension member 3 is hooked on the hook portion 11 a, the suspension member 3 is pushed against the urging force of the coil spring 18, and the suspension member 3 is pushed to the open position side, whereby the hook portion The suspension member 3 can be hooked on the hook portion 11a by opening the opening 13 of 11a. On the other hand, when the suspension member 3 hooked on the hook portion 11a is detached from the hook portion 11a, the suspension member 3 is detached from the hook portion 11a in a state where the stopper 17 is operated to the open position side by hand. Even if an external force acts on the suspension member 3 hooked on the hook portion 11a, the suspension member 3 cannot be easily detached from the hook portion 11a because the stopper 17 is held in the closed position by the coil spring 18. It is configured as follows.

(Second hook)
The second hook 20 prevents the suspension member 4 including the suspension ring, the suspension hook, the link 2a of the chain 2 and the like that is hooked on the hook body 21 and the hook portion 21a of the hook body 21 from being detached from the hook portion 21a. The stopper means 25 is provided. In addition, since the come-off prevention means 25 is the same structure as the come-off prevention means 15 of the 1st hook 10, the same code | symbol is attached | subjected to the same member and the detailed description is abbreviate | omitted.

  The hook body 21 has a J-shaped hook portion 21a, a mounting hole 21c provided in the proximal end portion 21b of the hook portion 21a, and a protruding shape from the proximal end portion 21b of the hook portion 21a to the distal end portion 21d side of the hook portion 21a. And a pivotal support hole 21f provided at the tip of the protruding portion 21e, and is formed of a metal plate having a substantially uniform thickness.

  A holding space 22 for holding the suspension member 4 is formed in the hook portion 21a, and the suspension member 4 is introduced into the holding space 22 from the outside between the tip portion 21d and the protruding portion 21e of the hook portion 21a. An opening 23 is formed.

  The hook body 21 is connected to the link 2 a at the other end of the chain 2. Specifically, when manufacturing the link 2a arranged at the other end of the chain 2, the metal wire is inserted into the mounting hole 21c of the hook body 21, and the metal wire is bent into an oval rounded rectangle. After processing, the both ends of the metal wire are welded to be connected to the other end of the chain 2.

  The plate thickness t2 of the metal plate constituting the hook body 21 is set to 5.0 to 7.0 mm so that the allowable load when one scaffold suspension chain 1 is suspended is 430 kg or more. When the thickness t2 of the metal plate constituting the hook body 11 is less than 5.0 mm, it is necessary to use a metal material having high strength and rigidity in order to ensure sufficient strength, and the material cost is increased. There is a problem that the workability is lowered, and if it exceeds 7.0 mm, a metal material that can be obtained at a low cost can be adopted. However, the weight of the scaffolding chain 1 increases, and the portability is lowered. Since there exists a problem that it falls, it is preferable to set to 5.0 mm or more and 7.0 mm or less. In the implementation product, a plate thickness t2 set to 6 mm was used.

  The first hook 10 and the second hook 20 are of any shape and configuration as long as the allowable load when one scaffolding chain 1 is suspended is 430 kg or more. The same configuration can be adopted, and the first hook 10 can be made larger than the second hook 20 as shown in FIG.

  Next, the suspension scaffold 30 using the scaffold suspension chain 1 will be described while explaining its construction method.

  First, as shown in FIG. 3, a plurality of suspension chain clamps 40 are fixed to a pair of beams 31 made of H-shaped steel or the like of a structure such as a bridge, with a space between each other. The first hooks 10 are respectively hooked on the suspension members 3 including the U-shaped suspension ring 43 of the clamp 40, and the upper ends of the plurality of scaffold suspension chains 1 are fixed to the two beams 31, respectively.

  Here, as shown in FIG. 5, the suspension chain clamp 40 has a C-shaped main body member 41, a fixing bolt 42 fixed to one end portion of the main body member 41, and the other end portion of the main body member 41. With a well-known configuration provided with a U-shaped suspension ring 43 as a suspension member 3 that is rotatably provided, with the body member 41 fitted to the flange portion 31a on the lower side of the beam 31, The fixing bolt 42 is tightened so that the flange 31 a is sandwiched between the fixing bolt 42 and the other end of the main body member 41 so that the fixing can be detachably fixed to the beam 31. However, as the suspension chain clamp 40, it is also possible to adopt another configuration. Further, as shown in FIG. 5, a suspension piece 44 is previously fixed to the beam 31 as the suspension member 3 by welding, and the first hook 10 is hooked on the suspension piece 44 or the chain 2 is wrapped around the beam 31. Thus, it is also possible to fix one end of the scaffold suspension chain 1 to the beam 31 by hooking the first hook 10 on the suspension member 3 consisting of the link 2a in the middle of the chain 2 extending downward from the beam 31. is there.

  Next, as shown in FIGS. 3 and 4, the second hook 20 is hooked on the link 2 a in the vicinity of the lower end of the chain 2 of the plurality of scaffold suspension chains 1 fixed to the two beams 31. A loop 2b is formed, and a pair of scaffold suspension chains 1 fixed at the same position in the length direction of the two beams 31 is inserted and supported in the vicinity of both ends of the horizontal pipe 32, so that two A plurality of horizontal pipes 32 are installed and supported between the beams 31. However, the loop 2b can be formed in advance at the lower end of the scaffold suspension chain 1 before being fixed to the beam 31.

  Next, as shown in FIGS. 3 and 4, two vertical pipes 33 are installed on the upper side of the plurality of horizontal pipes 32 with an interval therebetween, and are fixed to the horizontal pipe 32 by a pipe clamp (not shown). Then, the both ends of the two vertical pipes 33 are supported, and the scaffolding plate 34 is constructed and supported on the two vertical pipes 33 to construct the suspended scaffold 30.

  According to the scaffold suspension chain 1 and the suspension scaffold 30 using the scaffold suspension chain 1, since the temporary suspension is used in the temporary industry association, the allowable suspension load for one suspension is 430 kg. It is possible to suspend one loop with one scaffold suspension chain 1 using a scaffold suspension chain with a certified allowable load of 430 kg for loop suspension, and wrap the chain 2 around the beam 31. Since it is not necessary, the workability of the scaffold hanging chain 1 can be improved. In addition, there is no need to increase the number of scaffold suspension chains, as in the case of replacing a conventional suspension suspension chain with a single suspension using a single suspension with an authorized allowable load of 240 kg. The work time required for the construction of the suspension scaffold 30 can be greatly shortened.

  In addition, this scaffold suspension chain 1 is applicable also to suspension scaffolds using a scaffold panel such as a safety SK panel (manufactured by Alinco). In this case, the first hook 10 is hooked on the suspension member 3 such as the suspension chain clamp 40 and the suspension piece 44 fixed to the beam 31 and the upper end portion of the scaffold suspension chain 1 is engaged. After that, the lower end portion of the chain 2 is wrapped around the frame material of the scaffold panel, and the second hook 20 is hooked on the middle portion of the chain 2 between the frame material and the beam 31, or the inverted U-shaped suspension hook of the scaffold panel The scaffolding panel is suspended from the lower end of the scaffold suspension chain 1 by hooking the second hook onto the scaffolding chain.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above at all, The structure can be arbitrarily combined or changed in the range which does not deviate from the summary of this invention. Of course.

DESCRIPTION OF SYMBOLS 1 Scaffolding chain 2 Chain 2a Link 2b Loop 3 Hanging member 4 Hanging member 10 1st hook 11 Hook main body 11a Hook part 11b Base end part 11c Mounting hole 11d Tip part 11e Protruding part 11f Pivoting hole 12 Holding space 13 Opening part 15 Detachment means 16 Pivot pin 17 Fastener 18 Coil spring 20 Second hook 21 Hook body 21a Hook part 21b Base end part 21c Mounting hole 21d Tip part 21e Projection part 21f Pivot hole 22 Holding space 23 Opening part 25 Detach prevention means 30 Suspended scaffold 31 Beam 31a Flange 32 Horizontal pipe 33 Vertical pipe 34 Scaffold plate 40 Chain clamp 41 Body member 42 Fixing bolt 43 Suspension ring 44 Suspension piece

Claims (4)

A scaffold hanging chain comprising a chain, a first hook provided at one end of the chain, and a second hook provided at the other end of the chain,
The allowable load in one suspension of the scaffold suspension chain was set to 430 kg or more,
Scaffolding suspension chain characterized by that.   The scaffold suspension chain according to claim 1, wherein a wire diameter of the link of the chain is set to 6.5 mm to 8.0 mm.   The scaffold suspension chain according to claim 1 or 2, wherein the first hook is configured to be larger than the second hook. A suspension scaffold formed by suspending a scaffold using the scaffold suspension chain according to any one of claims 1 to 3,
The first hook is hooked on a suspension piece or suspension chain clamp fixed to the structure, and one end of the scaffold suspension chain is fixed to the structure.
The second hook is hooked and fixed to the suspension ring of the scaffold, or the chain is wrapped around the pipe of the scaffold, and the second hook is hooked and fixed to the middle part of the chain extending from the pipe to the structure side. The other end of the scaffold suspension chain was fixed to the scaffold.
Suspended scaffold characterized by that.

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