JPH094217A - Footboard for circular scaffolding - Google Patents

Abstract

PURPOSE: To make small the step level difference between footboard and standard framed scaffolds to increase safety and prevent the footboards from shifting and further, increase the strength of the whole scaffolds. CONSTITUTION: Footboard devices for a circular scaffold connecting standard framed scaffolds in which a pair of gate type braces are connected to cross each other and footboards are placed on horizontal pipes of the braces, are circularly arranged with a distance, are constituted of footboard bodies 12 fixed to a thick rectangular rib bodies 11, and step boards 23 fixed to thin reinforcing ribs 21 connected to both ends of the rib bodies 11 and grasping ribs 22. Grasping metal tools 24 with a C-shaped section are fitted respectively to the ends of grasping ribs and fixed to the horizontal pipes of the braces in the standard framed scaffolds and also the reinforcing ribs 21 are placed on the footboards of the standard framed scaffolds and the step boards 23 are arranged on the footboards.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circular scaffold tread device for connecting standard frame scaffolds spaced apart in a circular shape.

[0002]

2. Description of the Related Art Frame scaffolding used at construction sites
As shown in FIG. 4, a pair of gate-shaped building frames 90 in which two vertical pipes 91 are connected to each other near the upper ends thereof by a horizontal pipe 92, which is a beam, with two sets of X-shaped cross braces 93. The four pillars are connected to form a frame, and a tread board 94 is placed and fixed on two horizontal pipes 92 to form a unit. In addition,
The dimension of the cross braces 93 is standardized to a fixed value, that is, the span of the pair of building frames 90 is 1829 mm, 1524.
mm, 1219 mm, 914 mm, etc., and the width of the building frame 90 is also 1219 mm, 914 mm.
mm, 762 mm, 610 mm, etc., and the frame scaffold is a standard frame scaffold U.

Such standard frame scaffolds are arranged around a building under construction. When the building is circular, such as a circular tank, the standard frame scaffolds adjacent to the standard frame scaffolds arranged in a circle along the building. There is a gap between Therefore, a tread device for connecting the standard frame scaffold and the adjacent standard frame scaffold is required, but the conventional tread device has a simple structure in which the tread is attached to the rectangular rib. Then, both ends of the tread device are placed on the treads of the standard frame scaffold, and both ends of the tread device are bound to the treads of the standard frame scaffold by wires or ropes in order to prevent the tread device from falling off due to blowing up.

[0004]

By the way, in this tread device, in order to withstand a predetermined design load, the thickness of the rectangular rib is about 50 mm. For this reason, a large step of about 50 mm is formed between the tread device and the standard frame scaffold, and there is a problem that the operator is likely to stumble at this step. Also,
Since the tread device and the standard frame scaffold are fixed only by connecting them with a wire or rope, the tread device is easily displaced by vibration or impact, and the distance between the standard frame scaffold and the adjacent standard frame scaffold is likely to be uneven, The standard frame scaffolds and the adjacent standard frame scaffolds are fixed by using pipes without using standardized cross braces, and both ends of the pipes laid horizontally are fixed to the building frames of the standard frame scaffolds. Therefore, there is a problem that the strength of the entire scaffold is not always sufficient.

Therefore, according to the present invention, the step between the tread device and the standard frame scaffold is small and the safety is improved, the tread device is not displaced, and the distance between the standard frame scaffold and the adjacent standard frame scaffold is constant. It is therefore an object of the present invention to provide a circular scaffolding tread device that has the advantage that it can be fixed by standardized cross braces and that the strength of the entire scaffolding is also improved.

[0006]

In order to achieve the above object, the present invention provides a standard in which a pair of gate-shaped building frames are connected by cross braces and a tread is placed on a horizontal pipe of the building frame. Frame scaffolds are arranged in a circular shape with a space between them, and in this scaffolding device for circular scaffolds connecting the standard frame scaffolds, a main body tread attached to a thick rectangular main body rib, and a thin continuous tread attached to both ends of the main body rib. It consists of a reinforcing rib and a step plate attached to the grip rib, and a grip fitting with a C-shaped cross section is attached to each end of the grip rib. The grip fitting is attached to the horizontal pipe of the building frame of the standard frame scaffolding. While fitting together, the reinforcing ribs are placed on the treads of the standard frame scaffolding and the step plates are placed on the treads.

[0007]

In other words, what is placed on the tread plate of the standard frame scaffold is the thin reinforcing rib to which the step plate is attached, so that the step difference between the tread plate device and the standard frame scaffold is small and the safety is improved. Further, since the grips at both ends are engaged with the horizontal pipes of the building frame of the standard frame scaffold, the tread device is not displaced, and the distance between the standard frame scaffold and the adjacent standard frame scaffold is constant and standardized crossover. It will be possible to fix it with the braces, and the strength of the entire scaffolding will be improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the embodiments shown in the drawings. FIG. 1B shows a plan view of the tread device of the present invention, and FIGS. 1A and 1C show side views, respectively. The main body rib 11 has a U-shaped cross-section of the plate material. It is formed into a rectangular shape having a width of 500 mm and a length of 1442 mm, and its thickness (height) is about 50 mm. A body tread 12 having a plate thickness of 1.25 mm is welded to the body rib 11. Further, on one side surface of the main body rib 11, two connecting fittings 13 having a U-shaped cross section are provided.
Or installed.

Reinforcing ribs 21 and gripping ribs 22 are continuously provided on both side edges of the main body rib 11. The reinforcing rib 21 has a thickness of 16 mm and is much thinner than the main body rib 11. The thickness of the gripping rib 22 is about 50 mm like the main body rib 11, but the gripping metal member 24 has a C-shaped cross section at the end of the gripping rib 22.
Is attached. Here, two grips 24
Has a center-to-center length of 1892 mm, which is equal to the standardized size of the cross braces 93. The plate thickness is 1.6 mm on the reinforcing rib 21 and the gripping rib 22.
The step plate 23 is welded.

Since the tread device has a width of 500 mm, the auxiliary tread device shown in FIG. 2 is used together when the scaffold has a wider width. The structure of the auxiliary tread device is basically the same as that of the above-mentioned tread device. This will be described with reference to FIG. 2. A main body tread 32 is welded onto a rectangular main body rib 31 having a thickness of 50 mm and a lateral width of 240 mm, and a reinforcing member having a thickness of 16 mm from both ends of the main body rib 31. Only the rib 41 is continuously provided. That is, the gripping rib 22 and the gripping metal fitting 24 of the tread device are not provided. Then, the step plate 42 is welded onto the reinforcing rib 41, and one side surface of the main body rib 31 is provided with a tongue-shaped connecting fitting 3.
3 is attached. Therefore, by inserting and engaging the connecting metal fitting 33 of the auxiliary tread device to the connecting metal fitting 13 of the tread device of the present invention, the tread device and the auxiliary tread device of the present invention can be connected, and the width of the scaffolding is widened. be able to.

FIG. 3 shows an example in which the tread device and the auxiliary tread device of the present invention are connected and used. FIG. 3 (A) shows an example in which the standard frame scaffold U is arranged at an angle of 15 °. Figure 3
(B) shows an example arranged at an angle of 30 °. First,
Vertical pipe 91 outside the structure of the standard frame scaffold U
The distance of the vertical pipe 91 outside the standard frame scaffold U adjacent to is set to 1829 mm, which is equal to the standardized dimension of the cross bracing and the center-to-center distance between the pair of grip fittings 24, and the vertical pipes 91 are braced with each other. connect. Then, the grips 24 are placed outside the building, and the grips 2 on both sides are arranged.
4 are engaged with the horizontal pipes 92 of the standard framework scaffold U, respectively. As a result, since the standard framework scaffold U is arranged at an angle, the thin reinforcing ribs 21 are placed on the treads 94 of the standard framework scaffold U, and the step plates 23 and 42 are arranged on the treads 94. Then, in order to prevent the step plates 23, 4 from being removed by blowing up, a wire or a rope (not shown) is used.
Tie 2 and the tread 94. In addition, when the angle of the adjacent standard frame scaffold U becomes extremely large, the thick main body rib 11 causes the tread 9
In this case, it is necessary to use a tread device having a long reinforcing rib 21, that is, a step plate 23 having a long step plate 23.

As described above, the thin reinforcing ribs 21 to which the step plate 23 is attached are arranged on the step board 94.
Therefore, the level difference between the standard frame scaffold U and the tread device is small, and there is little risk that the operator will stumble and safety is improved.
Further, since the adjacent standard frame scaffolds U can be connected to each other by the standardized cross braces, the strength of the entire scaffold is improved, and further, the grip metal fittings 24 are attached to the horizontal pipes 92 of the standard frame scaffold U.
Therefore, the tread device will not be displaced due to vibration or impact.

[0013]

As described above, the tread device for circular scaffolding of the present invention has a body tread attached to a thick rectangular body rib, and thin reinforcing ribs connected to both ends of the body rib for gripping. It is composed of step plates attached to the ribs, and grips with a C-shaped cross section are attached to the ends of the gripping ribs, and the grips are reinforced and engaged with the horizontal pipe of the building frame of the standard frame scaffolding. Since the rib is placed on the tread of the standard frame scaffold and the step plate is arranged on this tread, the step between the tread device and the standard frame scaffold is small and it is safe, and the tread device shifts. Since the distance between the standard frame scaffold and the adjacent standard frame scaffold is constant, it is possible to fix the scaffold with standardized cross braces, and the strength of the scaffold as a whole is improved.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of a tread device of the present invention.

FIG. 2 is an explanatory diagram of an auxiliary tread device.

FIG. 3 is an explanatory view of a usage state of the tread device of the present invention.

FIG. 4 is a perspective view of a standard framework scaffold.

[Explanation of symbols]

 11 main body rib 12 main body tread 13 connecting metal fitting 21 reinforcing rib 22 gripping rib 23 step plate 24 gripping metal fitting 90 building frame 91 vertical pipe 92 horizontal pipe 93 cross bracing 94 tread U standard frame scaffolding

Front Page Continuation (72) Inventor Teruo Okuyama 1-13-1, Kaizuka, Kawasaki-ku, Kawasaki, Kanagawa Stock Company Shinnittan (72) Inventor Noboru Mizuochi 4020 No. 1 Saikoji, Kamiyamagawa, Yuki City, Ibaraki Prefecture 1 Stock Company Shinnittan Yuki factory

Claims (1)

[Claims] 1. Standard frame scaffolds in which a pair of gate-shaped building frames are connected by cross braces and treads are placed on horizontal pipes of the building frames are arranged in a circular shape and are spaced apart from each other. A footrest device for a circular scaffold for connecting a body footboard attached to a thick rectangular body rib, thin reinforcing ribs continuously provided at both ends of the body rib, and a step board attached to a gripping rib. In addition, gripping metal fittings each having a C-shaped cross section are attached to the end portions of the gripping ribs, the gripping metal fittings are engaged with the horizontal pipe of the building frame of the standard frame scaffolding, and the reinforcing ribs are A footboard device for a circular scaffold, which is placed on a footboard of a standard framed scaffold, and a step board is arranged on the footboard.