JP6653966B2 - Fall prevention scaffold - Google Patents

Description

  The present invention relates to a fall prevention scaffold, and more particularly to a fall prevention scaffold for covering an opening of a casing tube insertion hole provided in a tubing device and preventing a worker or the like from falling.

  A tubing device (all-casing excavator) is used as a means for press-fitting a large-diameter casing tube (steel pipe pile) into the ground or pulling it out. This tubing device generally includes a base frame installed on the ground, a drive frame provided above and below the base frame via a lifting cylinder, and a drive frame provided above the drive frame via a chuck cylinder. A chuck frame provided; and a casing tube insertion hole vertically penetrating through the central portions of the base frame, the drive frame and the chuck frame.

  In such a tubing device, a handrail is provided along an outer edge of a work deck provided on an upper surface of the tubing device main body in order to prevent a fall accident when performing operations such as insertion and detachment of a casing and pouring of concrete, A handrail member is arranged in a ring shape around a casing tube insertion hole (for example, see Patent Documents 1 and 2).

JP 2001-329775 A JP 2015-40434 A

  However, as described in Patent Document 2, when the handrail member is arranged in a ring shape around the casing tube insertion hole, it is possible to prevent the worker from falling into the casing tube insertion hole in a normal working state. On the other hand, in a standby state during non-construction, the casing tube insertion hole is open upward, so that it was not possible to completely prevent a tool or the like from falling. In addition, an iron plate of an appropriate size can be used as a cover material, but there is a problem that attachment and detachment and transportation are troublesome.

  Therefore, the present invention can reliably prevent an operator or the like from dropping over an opening that is open at the top, particularly, an opening of a casing tube insertion hole provided in a tubing device, and can easily perform transportation and storage. It is intended to provide a scaffold for preventing falling.

  In order to achieve the above object, the fall prevention scaffold of the present invention is a fall prevention scaffold that is installed so as to cover an opening that is open at the top, and the fall prevention scaffold has upper surfaces connected by a hinge portion. A pair of scaffold halves foldably connected to each other in a state where they face each other, and a pair of scaffold halves in a horizontally deployed state, a deployed scaffold lifting member for lifting the horizontal state in a deployed state, The present invention is characterized in that a stacking scaffold lifting member is provided for lifting a scaffold half in a superposed state in which a pair of scaffold halves are folded while maintaining a horizontal state in the superposed state.

  Further, the fall prevention scaffold of the present invention is characterized in that the opening is an upper opening of a casing tube insertion hole in a tubing device. Further, the fall prevention scaffold of the present invention includes a rotation lifting member for rotating the one scaffold half toward the upper surface of the other scaffold half at a rotation end of the one scaffold half. The deployment scaffold lifting member is rotatably formed at a storage position stored in a storage portion provided on a connection side of the scaffold half and a lifting position protruding above the scaffold half. The stacking scaffold lifting member further includes a storage position stored in a storage portion provided in a lower scaffold half positioned at the time of polymerization, and an insertion hole provided in the upper scaffold half. Is formed so as to be rotatable at a lifting position protruding upward from a half of the scaffold half located at the upper side through the through hole.

  ADVANTAGE OF THE INVENTION According to the scaffold for fall prevention of this invention, a worker, a tool, etc. can be prevented from falling in an opening part by covering an opening part in the state which expanded a pair of scaffold halves. Further, since the scaffold is formed so as to be foldable, it can be easily transported or stored by folding the fall prevention scaffold installed in the opening having a large diameter. Furthermore, by providing the deployment scaffold lifting member, attachment / detachment to the opening can be easily performed, and by providing the overlapped scaffold lifting member, loading / unloading to / from a carrier of a transport vehicle can be easily performed.

It is a top view which shows an example of one form of the scaffold for fall prevention of this invention. It is a sectional front view of the same scaffold for fall prevention. It is a sectional side view of an important section showing a deployment scaffold lifting member and a polymerization scaffold lifting member similarly. It is a top view showing the state where the fall prevention scaffold of the present invention was installed in the upper opening of the casing tube insertion hole in the tubing device. It is a sectional front view of an important section similarly.

  1 to 3 show an embodiment of the fall prevention scaffold of the present invention. The fall prevention scaffold 11 shown in the present embodiment is obtained by connecting a pair of scaffold halves 12, 13 formed in a semicircular shape in plan view by two hinge portions 14, 14 so as to be foldable. The scaffold halves 12, 13 are formed by joining expanded metals 12b, 13b to upper surfaces of frames 12a, 13a framed in a semicircular shape.

  The hinge portion 14 is provided on a semicircular chord portion, and extends in a direction from a state where the scaffold halves 12 and 13 are unfolded in the horizontal direction to a state where the upper surfaces of the scaffold halves 12 and 13 are overlapped with each other. Only the scaffold halves 12, 13 are foldably connected. Further, on the chords of the scaffold halves 12 and 13, a pair of scaffold halves 12 and 13 in a horizontally unfolded state are extended in a long plate shape so as to be lifted while maintaining the horizontal state in the unfolded state. Scaffold lifting members 15 are provided at two places. Further, on one scaffold half 12, two long plate-shaped superimposed scaffold lifting members 16 for lifting the folded superimposed scaffolds 12 and 13 while maintaining the horizontal state in the superimposed state are provided at two places. It is provided in.

  The deployed scaffold lifting member 15 is provided in a box-shaped deployed scaffold lifting member storage portion 17 provided on the chord side surface which is a connection side of the one scaffold half 12. The deployment scaffold lifting member storage section 17 has a horizontal support shaft 17a that rotatably holds the base end 15a of the deployment scaffold lifting member 15, and a rotation amount regulating member 17b. The deployed scaffold lifting member 15 having the base end 15a held by the support shaft 17a is in a storage position where the entirety is stored in the deployed scaffold lifting member storage portion 17 in a state where the deployment scaffold lifting member 15 is tilted horizontally around the support shaft 17a. When the distal end 15b of the scaffold lifting member 15 is rotated upward, the distal end 15b of the deployed scaffold lifting member 15 is in a lifting position protruding above the upper surfaces of the deployed scaffold halves 12, 13. Is formed. In addition, a mounting hole 15c for mounting a shackle 18a is formed at the distal end 15b of the deployment scaffold lifting member 15.

  The superimposed scaffold lifting members 16 are provided in box-shaped superimposed scaffold lifting member storages 19 provided at two places at the center of the scaffold half 12 positioned below during polymerization. The overlapped scaffold lifting member storage section 19 has a horizontal support shaft 19a that rotatably holds the base end 16a of the overlapped scaffold lifting member 16 and a rotation amount regulating member 19b. The overlapped scaffold lifting member 16 whose base end 16a is held by the support shaft 19a is in a storage position where the entirety is stored in the overlapped scaffold lifting member storage portion 19 in a state where the stacking scaffold lifting member 16 is horizontally tilted around the support shaft 19a. When the tip 16b of the scaffold lifting member 16 is rotated upward, the upper end of the scaffold half 13 is passed through a rectangular superimposed scaffold lifting member insertion hole 20 provided in the scaffold half 13 that is located above during stacking. It is formed so as to be a lifting position protruding from Further, a mounting hole 16c for mounting a shackle 18b is formed at the tip 16b of the polymerized scaffold lifting member 16. Further, in a superimposed state in which the scaffold halves 12, 13 are folded, the superposed scaffold lifting member 16 is projected upward to attach the shackle 18b to the mounting hole 16c. The scaffold halves 12, 13 can be reliably maintained in a polymerized state, and it is possible to prevent the scaffold halves 12, 13 from unexpectedly opening during transportation or storage.

  In addition, a turning end of one scaffold half 13 positioned above during stacking is turned to the upper surface of the other scaffold half 12 positioned below during stacking. A moving lifting member 21 is provided. The pivoting lifting member 21 has a base end 21a rotatably supported by a support shaft 22a provided in a groove-shaped opening 22 formed in the frame 13a of the scaffold half 13 and the expanded metal 13b. A mounting hole 21c for mounting the shackle 18c is formed at the tip 21b of the rotation lifting member 21. In the groove-shaped opening 22, a rotation stopper 22b for regulating the rotation range of the rotation lifting member 21 is provided. In a state where the scaffold halves 12 and 13 are deployed, the rotation lifting member 21 is brought to a storage position where it is accommodated in the groove-shaped opening 22 by being tilted in the horizontal direction, and the scaffold half 13 is pivoted and deployed. When the stacking state is changed from the stacking state, or when the stacking state is changed to the deployed state, the scaffold half 13 is formed so as to be rotatable from the upper surface side to the lower surface side in a state protruding from the scaffold half 13.

  The thus formed fall prevention scaffold 11 is installed so as to cover the upper opening of the casing tube insertion hole 32 provided in the tubing device 31, as shown in FIGS. 4 and 5, for example. In this case, the outer diameter of the fall prevention scaffold 11 in which the scaffold halves 12 and 13 are unfolded is formed to be larger than the inner diameter of the casing tube insertion hole 32, and the fall prevention scaffold 11 is inserted into the upper opening of the casing tube insertion hole 32. It is set so that the casing tube insertion hole 32 can be completely covered with the fall prevention scaffold 11 when it is placed.

  By covering the upper opening of the casing tube insertion hole 32 with the fall prevention scaffold 11 in this way, when the casing tube insertion hole 32 is opened upward in a non-operation state, various operations are performed on the upper work deck 33. In this case, it is possible to completely prevent a worker, a tool, or the like from falling into the casing tube insertion hole 32. Further, the attachment / detachment of the fall prevention scaffold 11 to / from the upper opening of the casing tube insertion hole 32 is performed by lifting the deployment scaffold lifting member 15 with a crane via the shackle 18a, thereby keeping the fall prevention scaffold 11 in the deployed state. It can be carried out.

  When the inner diameter of the casing tube insertion hole 32 is, for example, 3 m, the outer diameter of the fall prevention scaffold 11 exceeds 3 m. By folding into a polymerized state, the length can exceed 3 m, but the width can be reduced to 2 m or less, so that it can be easily transported by a general truck.

  Further, by providing the superimposed scaffold lifting member 16, the scaffold halves 12, 13 in the superimposed state can be hoisted while keeping the horizontal state, so that the loading and unloading to the loading platform can be performed easily and safely. In addition, by providing the rotating lifting member 21, the scaffold halves 12, 13 can be easily expanded and folded.

  Moreover, since the deployed scaffold lifting member 15, the overlapped scaffold lifting member 16, and the rotation lifting member 21 are stored in the storage section or the like so as to be within the thickness of the scaffold halves 12, 13 except during use. In addition, the number of members protruding from the upper surface of the fall prevention scaffold 11 covering the casing tube insertion hole 32 can be reduced as much as possible, and the plurality of fall prevention scaffolds 11 can be stably stacked when stored.

  In addition, a member for maintaining the developed state and a member for maintaining the superposed state can be provided. Further, a positioning member or a fixing member for fixing the fall prevention scaffold 11 to the opening may be provided. Furthermore, the fall prevention scaffold can be used not only for the upper opening of the casing tube insertion hole but also for covering various openings, and the outer shape is not limited to a circle but can be formed in a square shape. Further, a metal or wooden plate can be used in place of the expanded metal.

  11: Fall prevention scaffold, 12, 13: Scaffold half, 12a, 13a: Frame, 12b, 13b: Expanded metal, 14: Hinge part, 15: Deployment scaffold lifting member, 15a: Base end, 15b: Tip, 15c ... Mounting holes, 16: Stacked scaffold lifting member, 16a: Base end, 16b: Tip, 16c: Mounting hole, 17: Deployment scaffold lifting member storage section, 17a: Support shaft, 17b: Rotation amount regulating member, 18a, 18b, 18c: shackle, 19: stacking scaffold lifting member storage section, 19a: support shaft, 19b: rotation amount regulating member, 20: stacking scaffold lifting member insertion hole, 21: rotation lifting member, 21a: base end, 21b: distal end, 21c: mounting hole, 22: grooved opening, 22a: support shaft, 22b: detent, 31: tubing device, 32: casing tube insertion hole, 33: upper part Work deck

Claims (5)

  A fall prevention scaffold that is installed so as to cover an opening that is open at the top, wherein the fall prevention scaffold is a pair of scaffold halves that are foldably connected to each other so that upper surfaces thereof are opposed to each other by a hinge portion. And, a pair of scaffold halves in a horizontally deployed state, a deployment scaffold lifting member for lifting while holding the horizontal state in the deployed state, and a stacked scaffold half in which the pair of scaffold halves are folded, A drop prevention scaffold, comprising: a polymerized scaffold lifting member for lifting while holding a horizontal state in a polymerized state.   The fall prevention scaffold according to claim 1, wherein the opening is an upper opening of a casing tube insertion hole of the tubing device.   2. A rotating lifting member for rotating one scaffold half toward an upper surface of the other scaffold half at a pivot end of one scaffold half. Or the scaffold according to 2 above.   The deployment scaffold lifting member is configured to be rotatable between a storage position stored in a storage portion provided on a connection side of the scaffold half and a lifting position protruding above the scaffold half. The fall prevention scaffold according to any one of claims 1 to 3, characterized in that:   The stacking scaffold lifting member includes a storage position stored in a storage portion provided in a lower scaffold half positioned at the time of polymerization, and a scaffold half positioned upward through an insertion hole provided in the upper scaffold half. The fall prevention scaffold according to any one of claims 1 to 4, wherein the scaffold is formed to be rotatable at a lifting position protruding above the body.

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