JPH0320436Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention relates to construction scaffolding used at construction sites such as buildings, and in particular to a fall prevention device installed between a structure and a framework scaffold assembled around it. It is something.

Conventional technology In the construction work of buildings and civil engineering structures, scaffolding is provided for various workers during the period from erection to finishing work. This is then assembled into a framework scaffold made of prefabricated units by arranging them at equal intervals parallel to the outer wall surface using scaffolding board frames and braces, and then building them up ahead of or parallel to the ongoing construction work. It's layered. This framework scaffolding has a horizontal support on the side of the structure to prevent it from tilting or collapsing, and has handrails and a mesh frame on the outside side to facilitate work at heights, as well as to provide safety facilities. It is indispensable as such. In this framework scaffolding, the scaffolding boards that span each frame act as a ceiling for the lower floors and also act as a safety shelf for falling objects during construction, but there are horizontal structures in addition to horizontal supports between the scaffolding and the structure. In order to prevent falling objects at this interval, an eave-like plate is protruded from the lowest frame toward the structure to protect against falling objects, or to provide safety against accidental falls of workers. there was.

For such safety facilities, so-called brackets are commercially available.The base end is fixed to the construction pillar inside the gate frame body, the cantilever beam is projected toward the construction side, and an appropriate space is placed between the adjacent brackets. It is known that scaffolding boards are hung over the ground to prevent falls. Such a bracket is a roughly triangular frame made of steel corbels, and the cantilever on the upper side is telescopic, or the part that is fixed to the frame pillar is of a pivot structure, and the bracket itself is Scaffolding boards are provided that have a protruding position toward the supporting structure and a folded position parallel to the structure surface, and even those that have scaffolding boards placed and fixed to these can prevent falls. It has become so popular that the entire device is collectively called a bracket, and it has become an essential part of the structure, not just as an attached facility to a scaffold.

Problems that the invention aims to solve When looking at scaffolding facilities in terms of the functions of work and safety as described above, it can be said that they are fixed in terms of safety and dynamic in terms of work. Simply put, it is unavoidable that fixed safety facilities act as a hindrance to changes in work, and fall prevention shelves are often removed at any time during work. As mentioned above, some brackets have been developed to have such a corresponding function, but the more securely and securely fixing the scaffolding board to the brackets, the more the work is prioritized and the restoration after removal becomes more difficult. Management can become negligent. After all, conventional safety facilities ensure safety only when they are fixed and in an orderly manner, so as long as they are repeatedly removed temporarily for reasons such as bringing in materials or working on walls, separate safety facilities are not necessary. It is necessary to strengthen patrols through management and restore it to its original appearance to achieve its goals. Under these circumstances, there has been a growing desire for a fall prevention device that is easy to install, disassemble, and restore.

Means for Solving the Problems In view of the above-mentioned circumstances, the present invention has developed a fall prevention device installed on scaffolding, in which arms are fixed to both ends of the scaffold board, and these pairs of arms The base end of the scaffold board is pivoted to a pair of brackets fixed to the construction pillars of the frame body, and an integral fall prevention shelf that shares the brackets is formed in series on both sides of each bracket. The scaffolding is characterized by being movable between a horizontally protruding position toward the structure and a vertically folded position along the structure side of the scaffold, meeting work needs and ensuring safety. The purpose is to ensure that

Embodiments The fall prevention device for framework scaffolding of the present invention will be explained in detail based on drawings of preferred embodiments.

In FIGS. 1 and 2, 1 is a construction pillar of a unit frame of a frame scaffold, and is shown as an inner frame pillar facing the structure B shown at the right end in FIG. 1,
The distance between this frame 1 and the adjacent frame is set at 1.8 m according to normal standards, and the distance between it and the structure B is set at 40 cm or more.

2 is a T-shaped steel bracket with the web 21 vertical and the flange 22 horizontal at the lower side, with a total length of 15 cm and the web 21 so as to have a trapezoidal side.
The outer end side of the pipe is cut off, and the small end of the inner end 23 is vertically welded to a steel pipe clamp C in the direction of pipe insertion. 3 is a short support shaft made of flat steel, with a space provided between the base end side of the web 21 of the bracket 2 and the flange 22, with the direction of the width 31 of the steel material being perpendicular;
The thickness 32 direction is horizontal, protrudes perpendicularly to the surface of the web 21, and is fixed horizontally on both sides thereof. This shaft member 3 may be inserted through the web 21, and the protruding portions on both sides thereof may be formed of a single material and welded.

Next, 4 is an arm made of L-shaped steel, and has a vertical side 41 and a horizontal side 42, and has a total length of 30 cm.
Bolts 43 are welded onto the upper surface of the horizontal side 42 at two locations, and the bolts 43 and nuts 4
4 fixedly supports the end of the scaffolding board 5. Normally, the horizontal flange 42 is the lower side. On the other hand, an opening 46 is provided near the base end of the web 41 of the arm 4 at a position a predetermined distance away from the base end 45 thereof. This opening 46 has a circular portion 47 having an inner diameter to which the shaft 3 is rotatably attached when the shaft 3 is inserted thereinto, and a cutout that is widened in the longitudinal direction of the arm 4 so as to engage the side edge of the thickness 32 of the shaft 3. It has a notch 48 and is formed approximately in the shape of a keyhole.

Further, the corners of the vertical side 41 and the horizontal side 42 are chamfered 49 from the base end 45. The cutting dimension of this hypotenuse is sufficient as long as it does not come into contact with the upper surface of the flange 22 of the bracket 2 when the arm 4 is rotated around the shaft 3, and may be in the shape of an arc. Further, an opening 4 is provided at the base end 45 of the arm 4.
The above-mentioned predetermined dimension D is given in relation to the center position of 6. That is, when the arm 4 is rotated 90 degrees around the shaft 3 and raised to the side of the frame column 1, the notch 48 faces the top surface of the shaft 3, and when the arm 4 is lowered as a whole, the notch 48 is fitted onto the upper side of the shaft 3, the base end 45 comes into contact with the upper surface of the flange 22, and the arm 4 and the shaft 3 are engaged with each other. Therefore, the center position of axis 3,
When the center position of the opening 46 is determined, the seat 2 provided on the top surface of the tip of the flange 22 of the bracket 3
4 holds the arm 4 horizontally, and when the arm 4 is rotated vertically, the end dimension D and the cutting depth of the notch 48 are both determined as design values. Further, the cross section other than the engagement portion between the shaft 3 and the vertical side 41 of the arm 4 may be circular.

Next, the scaffold board 5 is preferably made of commercially available thick plywood with a width of 24 mm and a thickness of 24 mm, and has two mounting holes 51, 51 at each end, and as shown in FIG. Arm 4 similar to the above provided on frame column 1
It is spanned across the horizontal sides 42 of the two arms 4 which are paired as a pair, and is attached with bolts 43 and nuts 44 so that both ends are supported. As a result, the bracket 2 attached to each frame column 1 can have two arms 4 pivoted from both sides to the shaft 3 protruding from both sides of the web 21, and the arms 4 and the scaffold board 5 can be integrated. The fall prevention shelf is assembled so that it can be raised and lowered between horizontal and vertical positions, and the fall prevention device is completed.

In order to further improve the safety of this device, which serves as both a fall prevention shelf and an auxiliary scaffold, it is preferable to improve the installation and strength by using two upper and lower clamps C for supporting the bracket 2 at its base. . In one example, an additional clamp Ca is coaxially fixed to the clamp C, as shown by the dotted line in FIG. Part 25
It is best to secure the clamp and bracket together over the entire length of the bracket.

Function The function of the present invention will be explained based on the method of assembling and using the device.

First, once the frame scaffolding is installed, select the frame posts 1, 1 of one set of frame bodies, use the clamp C that fixes one set of brackets 2 to the web 21, and attach the frame posts with the tips facing the structure B side. Install it at the same height as 1. As explained in the following embodiments, the arm 4 is attached via the shaft 3 to serve as a supporting hardware, and the scaffold board 5 is attached by spanning the opposing flanges 42. This mounting order may be changed. During this time, the positions of both ends of the pair of arms 4 are determined by the length of the scaffolding board 5, and although the shaft 3 and the opening 46 of the arm are simply fitted together, there is no risk of the scaffolding falling off. Board 5 is arm 4 at both ends
Along with this, it becomes possible to rise and fall freely. Although the scaffolding board 5 is only supported at both ends, it forms an auxiliary scaffolding/fall prevention shelf between the framework scaffolding and the structure B, which is horizontal both in the lengthwise direction and the widthwise direction, due to its selected strength.

As construction progresses, the horizontal auxiliary scaffolding often has to be temporarily removed when work is performed or materials are transported between the scaffolding and the structure. In the method of using the device of the present invention, when a worker places his hand on the outer edge of the scaffold board 5 from above the scaffold board of the framework scaffold and lifts it up, this force causes the arms 4 at both ends to rotate around the axis 3. , and stand up with axis 3 as the center. Arm 4
When the worker's holding force is released when the and scaffolding board 5 are upright, the opening 46 that has moved around the axis 3
The notch 48 descends together with the arm 4 from a position facing above the shaft 3 and is fitted onto the shaft 3 from above.
(Dotted line shown) At the same time, the base end 45 of the arm 4 also descends and stops when it comes into contact with the upper surface of the flange 22 of the bracket 2, and the engagement between the notch 48 and the upper edge of the shaft 3 is achieved, and the arm 4 is held in an upright position. In this state, the fall prevention shelf is evacuated from between it and the structure B, and this space is used as a free space for various operations. After completing the work, the fall prevention shelf can be easily restored by simply performing the above operations in reverse.

Effects of the invention Since the fall prevention device of the present invention is constructed as described above, it uses almost the same type of materials compared to conventional similar equipment, and the amount of materials used is rather reduced. Since the scaffolding board and the arm are fixedly supported and the entire structure is movable, the labor required for mounting and fixing the scaffolding board and disassembling and removing it in the conventional bracket is completely eliminated.
Therefore, even after removing it from time to time in response to work, it is possible to immediately return it to the fixed state as a safety facility on the spot without any hassle. In addition, since this can be done by the worker himself/herself, there is no need for separate safety management. In addition, the shaft-mounted system, which is movable upright and upright, can automatically hold and hold the unit even when standing upright, and can secure a working space suitable for removal.

[Brief explanation of the drawing]

The drawings show a preferred embodiment of the present invention, with FIG. 1 being a side view mainly showing the supporting hardware, and FIG. 2 being an elevational view seen from the tip side of the supporting hardware. 1... Construction pillar, frame pillar, 2... Bracket, 21
... Web, 22 ... Flange, 23 ... Web base end, 3 ... Support shaft, 32 ... Thickness, upper edge, 4 ...
Arm, 41...Vertical side, 42...Horizontal side, 4
3, 44... Bolt, nut, 45... Base end, 4
6...Opening, 47...Circular part, 48...Notch,
49... Chamfering, 5... Scaffolding board, 51... Mounting hole, D... Predetermined dimensions, B... Construction.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A vertical web with an inverted T-shaped cross-section and a vertical web with a gripping hardware fixed to the base end to be attached to the construction frame pillar of the scaffolding and the lower end of the web. a bracket having a flange extending horizontally to the base end thereof, a support shaft fixed to the surface of both side surfaces of the web in a direction perpendicular to the surface and horizontally, and a piece perpendicular to the support shaft; The bracket has a pair of supporting hardware including an arm having an L-shaped cross section for pivoting the opening at the base end, and a scaffold board having a length corresponding to the spacing between the construction frames, and the surface of both sides of the web of the bracket. A pair of arms are placed opposite each other, and a scaffolding board is spanned between the horizontal sides of the arms, and both arms and the scaffolding board remain integrated to prevent horizontal falls. A fall prevention device for a frame scaffold, characterized in that it is rotatable between a posture that serves as a shelf and an auxiliary scaffold and an upright retracted posture in which it is secured and held on a support shaft. (2) The means for retaining the engagement between the support shaft and the arm is based on a fitting structure in which a part of the opening is widened and the support shaft is moved relative to each other. Fall prevention device for framework scaffolding.