JPH022828Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a stair formwork used for constructing stairs by on-site concrete pouring.

More specifically, the upper weir plate for creating each step of the concrete staircase, the lower weir plate for creating the back side of the stairs, and the lower shoring that supports both of these weir plates and the concrete to be poured. , and an upper shoring which is connected to the lower shoring via a fastening hardware and is inclinedly disposed above the upper weir plate along the staircase slope while maintaining a constant interval between the two weir plates. Regarding the stair formwork provided with.

[Conventional technology]

Conventionally, the formwork for stairs generally had a structure as shown in FIG. In other words, in order to create the back side of the stairs, a lower weir board S _L ′ such as a plywood board is used.
This weir plate S _L ′ is supported by a lower support T _L ′ consisting of thick timbers 20 a, pipe supports 20 b, and the like. Furthermore, in order to create each step of the staircase, an upper weir plate S _U ' is provided at the riser of each step, with a plurality of plywood boards 21 and the like erected vertically. Then, on the top of this upper weir plate S _U ′,
An upper support T _U ′ such as a thick timber 23 is installed at an angle along the slope direction of the stairs via a stop plate 22 to prevent deformation of the weir plate, and the upper and lower supports T _L ′ and T _U ′ are Upper and lower weir plates S _L ′, S _U ′ can be connected by tightening hardware M′, etc.
The intervals between the two are kept constant.

Although not shown, in order to prevent concrete from spewing out from the stair treads during concrete pouring, a plywood board, etc. is provided in this part, and together with the plywood board, etc. of the riser part, the upper weir plate S _U ' is formed. There are some things like that (there is no specific literature).

[Problem that the invention attempts to solve]

However, in the case of the above-mentioned conventional configuration, the current situation is that there are problems as described below, and there is room for improvement.

In other words, after the formwork F _S ' is assembled and until the concrete is poured, this part of the stair form F _S ' is often used as a temporary passage connecting the upper and lower floors. However, because the upper supports T _U ′ are lined up in the width direction of the stairs, it is difficult to pass through them. In addition, due to multiple passes, the plywood boards, etc. on the treads that make up the upper weir board S _U ' often come off, and the plywood boards, etc. on the risers often fall over, resulting in a lot of rework. This tends to happen. Furthermore, in the case of the upper weir plate S _U ′ with an open tread surface as shown in Figure 5, when passing through the stairway formwork F _S ′, reinforcing bars that have not yet been buried in the concrete may be removed. You will step on B _S ′. Therefore, the reinforcing bars are likely to be disordered, and there is a risk that the reinforcing bars may not be sufficiently covered at the lower end of the stair slab, or that the strength of the stairs may be insufficient.

In view of the above-mentioned circumstances, the purpose of this invention is to create a stairway formwork that can be easily passed through when used as a temporary passageway, and that will not have any adverse effects on the formwork itself or reinforcing bars, etc. It's about doing.

[Means for solving problems]

The characteristic structure of the stair formwork according to the present invention is that a plurality of nearly horizontal treads are attached to the upper support, which is installed at an angle along the slope of the stairs above the upper weir plate for creating each step of the stairs. This is because it was established.

[Effect]

In other words, by standing on these treads, you can pass through the stairway formwork without stepping on any weir boards or reinforcing bars.

[Effect of the idea] As a result, even if this stairway formwork is used as a temporary passageway for connecting the upper and lower floors after the formwork is assembled and before the concrete is poured, the weir plate will not come off or tilt. There is less risk of the reinforcing bars becoming loose, and the disorder of the reinforcing bars can also be reduced. Therefore, it is possible to suppress the occurrence of rework, and also prevent a decrease in the strength of the stairs, making it possible to provide an excellent stair formwork that can effectively reduce costs and ensure quality. .

In particular, when a reticulated steel plate such as Ribrass is used as the upper weir plate, as in the case of the embodiment described later, deformation due to passage is likely to occur, so the effects of the present invention are more pronounced.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

Figure 1 shows formwork F _S for constructing a staircase made of reinforced concrete. T _L is the lower shoring that supports the load of the concrete being poured. This lower support T _L consists of upper and lower horizontal members 1 installed horizontally at both the upper and lower ends of the stairs.
a, 1b, and both horizontal members 1a, 1b
It has an inclined member 1c which is constructed over the area.

The horizontal members 1a and 1b are made of C-shaped steel, and at both the upper and lower ends of the stairs,
A pair of horizontal members 1a and 1b are arranged in parallel at appropriate intervals in the width direction of the stairs. Each horizontal member 1a, 1b is connected to a vipe support 2 erected on the slab of the lower floor and a wall formwork F _W of the lower floor.
It is supported by hanging hardware 4 made of both steels suspended from the upper end of a steel pipe end 3 constituting the pipe. and,
At both the upper and lower ends of the stairs, steel pipe ends 5a, 5b are placed along the width direction of the stairs over the upper parts of the pair of horizontal members 1a, 1b. On top of 5b, stair formwork F _S
Plywood boards 6a and 6b constituting the lower weir board S _L are spread all over.

The inclined member 1c is also formed from C-shaped steel, and a pair of inclined members 1c, 1 are arranged in parallel in the width direction of the stairs.
c is supported by upper and lower horizontal members 1a and 1b located at corresponding positions, respectively. Inclined member 1
c and the upper horizontal member 1a are attached to be rotatable around a fulcrum P by a pin 7. Also,
The inclined member 1c and the lower horizontal member 1b are configured such that bolts 8 are tightened by combining appropriate elongated holes m and n formed in both members. In other words, commensurate with the slope of the stairs, etc.
The mounting angle and mounting position of both members 1a, 1b and the inclined member 1c can be changed and fixed as appropriate. Angle steels 9 for preventing falling are welded to each of the pair of inclined members 1c at appropriate intervals along the slope direction of the stairs. A plurality of steel pipe ends 5c are placed while being received by the angle steels 9, and the lower weir plate S _L
The sloping portion of the plywood board 6c that makes up the structure is laid out.

On the other hand, the upper weir plate for creating each step of the stairs
S _U is provided above the lower weir plate S _L. As shown in Figures 1 to 3, this upper weir plate
The S _U is formed from ribs 10, and in order to prevent deformation due to lateral pressure during concrete pouring, rib portions 10a are provided at each entry corner r and each exit corner e in a cross-sectional view of the staircase. It is bent so that it is placed. Further, reinforcing metal fittings 11 made of nine reinforcing bars are placed along each corner r, and are fastened to the rebrass 10 with binding wires. As shown in FIGS. 3 and 4, both ends of the re-brass 10 in the width direction of the stairs are covered with plywood boards 12 that serve as dam plates for the rising part of the stairs.
It is fastened with a binding wire to the angle steel 13 which is nailed and fixed to. Note that the nails 14 for fixing the angle steel 13 to the plywood board 12 in the upright portion are double-headed in order to facilitate the removal of the angle steel 13 when dismantling the formwork.

In other words, when pouring concrete, Libras 10 sufficiently prevents the concrete from spewing out, while at the same time preventing concrete from pouring into the stairway formwork F _S , especially into the corner e of the stairway where it is difficult for concrete to enter. It is extremely easy to visually check the quality of concrete filling. Therefore, while making it possible to cast high-quality concrete without any slabs, etc., the concrete for the stairs can be cast all at once, and it is possible to improve work efficiency and quality at the same time. In addition, the concrete that oozes out from the openings of the libras 10 during concrete placement forms an uneven surface when hardened, which improves the adhesion of mortar and the like in the later finishing process.

Then, fixing hardware 16 is attached to four bolts 15, which are fixed to the inclined member 1c of the lower support T _L and protrude upwardly, passing through both the upper and lower weir plates S _L and S _U.
The upper shoring T _U is fixed through. This upper support T _U has a pair of C-shaped steels 17a arranged facing each other, and a plurality of tread plates 1 spanning both C-shaped steels 17a.
7b is fixed by welding. Both C-shaped steel 17a
The lower end line _of
The weir plates S L and S U are arranged so as to come into contact with each of the protruding corners e of the weir plates S _L and S _U to maintain a constant distance from each other against the lateral pressure during concrete pouring.

Each step board 17b is formed from a floor steel plate, and is positioned substantially horizontally when the formwork F _S is installed.

Therefore, after the assembly of the formwork F _S is completed and before concrete is poured, when using the stair formwork F _S part as a temporary passage, it is necessary to step on the tread 17b of the upper support T _U. Therefore, it is possible to pass through the formwork F _S and reinforcing bars B _S without stepping on them, reducing the need for rework, as well as preventing the reinforcing bars B _S from being disturbed and reducing their strength. .

The material, shape, mounting structure, etc. of the upper and lower shoring T _L , T _U and the upper and lower weir plates S _L , S _U can be changed as appropriate. For example, plywood may be used as the upper weir plate S _U. Of course, there is no problem. In addition, in the above-mentioned embodiment, the stairway formwork F _S is supported by four pipe supports 2 (top, bottom, left and right) and hanging hardware 4 so that it can easily pass through when used as a temporary passage. However, in the present invention, the lower support T _L may have a large number of pipe supports 2 as in the conventional case. Furthermore, in the previous embodiment, in order to increase the versatility of the formwork F _S , the inclined member 1c and the horizontal members 1a and 1b were used.
Although a case has been described in which the mounting angle of the inclined member 1c can be arbitrarily changed and fixed, the slope of the inclined member 1c may be fixed.

For the upper weir plate S _U , expanded metal, punched metal, or the like may be used in addition to the rebrass 10, and these are referred to as a reticulated steel plate 10. The material, shape, etc. of this reticulated steel plate 10 can be changed as appropriate.

Further, to connect the upper and lower supports T _L and T _U , ordinary separators or the like may be used instead of the combination of bolts 15 and fixing hardware 16, and these are referred to as fastening hardware M.

[Brief explanation of drawings]

1 to 4 show embodiments of the present invention,
Fig. 1 is a side view of the stair formwork, Fig. 2 is a view taken along the - line in Fig. 1, Fig. 3 is an enlarged sectional view showing the mounting part of the ribras, and Fig. 4 is an enlarged view showing the mounting part of the ribrass. The front view and FIG. 5 are sectional views corresponding to FIG. 1 showing a conventional example. S _U ... Upper weir plate, S _L ... Lower weir plate, T _L ... Lower shoring, T _U ... Upper shoring, M ... Fastening hardware,
17b...Treadboard, 1a, 1b...Horizontal member, 1c
... Inclined member, 10 ... Reticular steel plate.

Claims (1)

[Scope of claim for utility model registration] Upper weir plate S _U for creating each step of the concrete staircase, lower weir plate S _L for creating the back side of this staircase, these two weir plates S _U , S _L and The lower support T _L that supports the concrete to be poured,
In addition, it is connected to this lower shoring T _L via a fastening hardware M, and the upper weir plate S _U is tilted along the staircase slope while maintaining a constant distance between the two weir plates S _L and S _U. Upper shoring to be installed T _U ,
In the stair formwork with
A stair formwork in which a plurality of substantially horizontal treads 17b are provided on T _U. The stair formwork according to claim 1, wherein the upper weir plate S _U is a mesh steel plate 10. Upper and lower horizontal members 1a and 1b, in which the lower support T _L is installed in a substantially horizontally supported state near both the upper and lower ends of the stairs, and
It is constructed across both horizontal members 1a and 1b, and both horizontal members 1 are constructed in accordance with the slope of the stairs.
The stair formwork according to claim 1 or 2, which has an inclined member 1c whose mounting angle can be freely changed and fixed with respect to a and 1b.