JPH0244975B2 - OOGATAKATAWAKUNODATSUGATAKOHO - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a method for demolding large formwork used in constructing buildings such as apartment complexes and buildings.

[Conventional technology]

When constructing an apartment complex, large floor formwork or large formwork combined with beam formwork is installed in parallel, and after pouring concrete for the floor slab onto the large formwork, it is removed from the form as it is. A large formwork construction method is known in which the concrete work is carried out while repurposing and reusing the large formwork for the upper floors.

Figure 5 a, b, and c show an example.
A large formwork 1 consisting of a temporary beam 2 assembled in a truss shape and a floor form 3 on the temporary beam 2 is used as a known floor slab A.
It is supported by a plurality of supports 4 on top, and concrete for the floor slab A of the upper floor is poured on top of it. Although not shown, in the width direction of the large formwork 1, the two left and right temporary beams 2 are connected by a connecting material.
In this example, the large formwork 1 is supported by a total of 10 supports 4, including the four corners and six in the middle. Further, in the figure, numeral 5 is a corner material for installing the support 4, and numeral 6 is a net for preventing falling.

Incidentally, conventionally, demolding of such a large-sized formwork 1 has been carried out according to the following procedure, as shown in FIGS. 6a, b to 8a, b, c.

First, the supports 4 at the four corners are shortened to store the square timbers 5. Next, shorten the 6 middle supports 4,
The six middle supports 4 and the square beams 5 are stored as shown in the figure. Next, as shown in Fig. 6b, the jack receiving brackets 10 are fixed with bolts under the four corner steel beams B of the large formwork 1, the hydraulic jacks 11 for demolding are set, and the jacks are lifted to remove the mold. (See Figures 6a and b). At that time, the fall prevention net 6 is folded.

As shown in FIG. 7b, the jack receiving brackets 10 are placed at four predetermined locations on the temporary beams 2 of the large formwork 1.
Move it to the bottom and set the hydraulic jack 18.
Next, the demolding post 19 is fixed at four predetermined locations with bolts, and the jack 18 is jacked up to store the support 4. Next, the jack 18 is lowered, the demolding posts 19 are placed on the ground, and the large formwork 1 is supported by the four demolding posts 19 (Fig. 7a,
b, c).

The jack receiving bracket 10 is again placed on top of the temporary beam 2, and the hydraulic jack 18 is set. Remove the demolding post 19 by jacking it up, place the rollers 12 at six predetermined positions, lower the jack 18, and place the large formwork 1 on the rollers 12 (see FIGS. 8a, b, and c).

Note that the large formwork 1 is then pulled out along the rollers 12 and transferred to the upper floor by a crane or the like.

[Problem that the invention seeks to solve]

In the above-mentioned conventional demolding method, it is necessary to reload the mold during demolding and lowering, which requires a lot of effort and time. In addition, when demolding, the large formwork does not fall horizontally, so there is a risk that the supports may bend, and there is also the problem of impact on the floor.

This invention aims to solve the problems in the prior art as described above.

[Means for solving problems]

In the demolding method for large formwork of this invention, a plurality of hanging devices 8 such as chain blocks are installed on the steel beam B under the floor slab A to be poured, and the lifting devices 8 and the large formwork 1 are connected to each other. The large formwork 1 can be suspended and supported by being connected. In that state, remove support 4,
The demolded large formwork 1 is suspended and supported by the steel beam B via a suspension device 8. Next, the hanging device 8
By operating the large formwork 1, the large formwork 1 can be lowered quietly without having to be replaced.

〔Example〕

Next, the illustrated embodiment will be described.

Since FIGS. 1a, b, c to 3 a, b, c show embodiments of the present invention, the work will be carried out in the following steps.

Attach the hanging jig 7 to the lower flange 13 of the steel beam B at four locations as shown in Figure 1 a, b, and c, suspend the chain block as the hanging device 8, and sling it to the temporary beam 2 of the large formwork 1. Hook the wire 9 on the hook at the tip. In this state, the supports 4 are contracted and the square timbers 5 are housed in the large formwork 1.

As shown in FIG. 4, the hanging jig 7 may be one in which a pair of metal fittings made by bending a steel plate are joined with bolts 17 so as to be latched to the lower flange 13 of the steel beam B. In addition, in the figure, 14 is a stiffener, 15 is a bolt hole, and 16 is a mounting hole for attaching a hanging device.

Next, as shown in FIG. 2a, the support 4 is stored and the fall prevention net 6 is also folded. Second
Jacket bracket 1 as shown in Figures b and c.
0 with bolts, and set demolding jacks 11 at each of the four locations. At this time, the hanging device 8
The chain block is loosened and suspends and supports the large formwork 1 that has been removed from the mold by jacking up the jacks 11 for removing the mold.

Rollers 12 are installed at six predetermined positions, and by operating a hanging device 8, the demolded large formwork 1 is suspended and placed on the rollers 12.

〔Effect of the invention〕

In the construction method of this invention, when removing large formwork from a mold, the large formwork is supported on a steel beam via a lifting device such as a chain block, and the lifting device is suspended one by one. It can be safely lowered by operation.

In addition, unlike conventional construction methods, there is no impact on the floor slab below during demolding, and no excessive force is applied to the supports. Also, since there is no need to change the jack, there is no hassle and the work can be completed quickly.

[Brief explanation of the drawing]

Figures 1a, 2a and 3a are side views showing the construction procedure in an embodiment of the present invention, Figure 1b,
Figures 2b and 3b are front views of the main parts, Figure 1c,
Figures 2c and 3c are side views of the main parts, Figure 4a is a side view of the hanging jig attached to the steel beam, Figure 4b is a front view, Figures 5a and 6a. , Fig. 7a, Fig. 8a are side views showing the construction procedure of the conventional example, Fig. 5b,
Figures 6b, 7b, and 8b are front views of the main parts;
FIG. 5c, FIG. 7c, and FIG. 8c are side views of the main parts. A... Floor slab, B... Steel beam, 1... Large formwork, 2... Temporary beam, 3... Floor formwork, 4... Support, 5... Bedding square timber, 6... Fall prevention net, 7...
...hanging jig, 8...hanging device, 9...wire,
10... Jacket bracket, 11... Jacket for demolding, 12... Roller, 13... Flange, 1
4... Stiffener, 15... Bolt hole, 16...
Mounting hole, 17... Bolt, 18... Jacket, 1
9...Demolition post.

Claims (1)

[Scope of Claims] 1. After pouring concrete onto the large formwork, the large formwork can be suspended and supported by a plurality of hanging devices installed on the steel beams below the slab, and the support is removed to demold the form. A method for demolding large formwork, characterized in that the large formwork is suspended and supported by the steel beam via the hanging device, and the large formwork is lowered by operating the hanging device. 2. The method for demolding large formwork according to claim 1, wherein the hanging device is a chain block.