JPH0321770A - How to support slab formwork - Google Patents

Abstract

PURPOSE:To improve the work efficiency by laying a balloom-form blocks made by pressing in the air in containers formed in a box-shape and applying a pressure, between underground beams, and laying a slab mould on the upper surface. CONSTITUTION:After underground beams 4 and 4 are constructed, balloom-form blocks 9... made by pressing in the air and applying a pressure in box-form containers of a synthetic resin are laid between the underground beams 4 and 4. In this case, verious large and small sizes of balloom-form blocks 9... are used, and moreover, they are laid giving no gap by regulating the inside air pressure adequately. The upper surfaces of them are made even, over which a slab mould 5 is laid by supporting with the balloom-form blocks 9..., and a concrete is placed over the surface to construct a slab 6.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method for supporting slab formwork used when constructing a slab that is built on the ground when constructing a structure.

[Prior art] When constructing a slab on the ground, as shown in Figure 3,
After excavating the ground 1 to the required depth and constructing the foundation 2 underground for the underground beam construction section, underground Yanagawa formwork 3 is erected and concrete is poured, and after curing, the formwork 3 is removed. Then, underground beams 4 are constructed at predetermined intervals, and then slab formwork 5 is placed and supported in the horizontal direction between each of the underground beams 4, and concrete is poured onto the slab formwork 5. Slab 6 is then constructed.

Conventionally known methods for supporting slab formwork when placing and supporting the slab formwork 5 above the underground beams 4 after constructing the above-mentioned underground beams 4 include: ■ Supporting with support hardware; ■Method of supporting by mounding soil, ■Method of supporting with foamed steel, etc.

As shown in Fig. 4, the method (2) is to install the expensive supporting hardware 7 in the space between the underground beams 4 after constructing the underground beams 4, and place the slab formwork on the supporting hardware 7. 5 is placed and supported, and in this state, concrete is poured onto the slab formwork 5 to construct a slab 6.

As shown in Fig. 5, the method (2) is to backfill soil 8 between the underground beams 4 and to support the slab formwork 5 by rolling it on top of the backfilling soil 8. .

In method (2), blocks of foamed steel are packed between the underground beams 4, and a slab formwork 5 is placed on top of the foamed steel to support it.

[Problems to be Solved by the Invention] However, each of the above conventional methods (■■■) has the following drawbacks.

In the case of method (■), the slab formwork 5 using the supporting hardware 7
This has the advantage of being able to support the slab formwork 5 easily and quickly, resulting in excellent workability. However, on the other hand, in order to recover the expensive supporting hardware 1 after slab construction, It is necessary to provide a post-cast opening in a part of the middle beam 4 or the slab 6, and the construction is difficult.

In addition, in the case of method (■), after constructing the underground 134, it is necessary to create an extra embankment passage in order to pass large heavy machinery over the underground beam 4, and when backfilling the soil, it is necessary to break this while filling. It is necessary to perform backfilling, and the work efficiency is poor because workers have to do it manually in small spaces.Also, when working in urban areas, it is difficult to obtain soil for backfilling, and securing soil for backfilling requires high construction costs. It is expensive, and furthermore, it requires time-consuming work such as water tightening to compact the backfilled soil.

In the case of method (2), foamed steel blocks are laid between the underground beams 4, and when the foamed steel blocks are assembled and cut to fit the size of the area, the foamed steel powder at the cut end is It is easy to scatter and may cause a pollution problem.Also, when constructing the underground beams 4, when digging the ground 1, there are cases where the top is left on the mountain as shown by the two-dot chain line between the underground beams 4. , if you leave the soil as above to reduce the amount of foamed steel,
Although the amount of foamed steel can be reduced, it has the disadvantage of having to insert foamed steel blocks between the four underground beams.

Therefore, the present invention aims to eliminate the above-mentioned drawbacks by making it possible to support a slab formwork without using the conventional methods described above.

[Means for Solving the Problems] In order to solve the above problems, the present invention, after an underground beam is constructed, fills a box-shaped container such as a cube or rectangular parallelepiped with air and pressurizes it. Balloon-shaped blocks made of clay are spread between the underground beams, and the upper surfaces are flattened and slab formwork is laid out on top of them, so that the slab formwork is supported by being pushed onto the balloon-like blocks. The balloon-shaped blocks will be prepared in different sizes and laid out without any gaps, and the balloon-shaped blocks will be deformed and packed while adjusting the amount of air inside as appropriate.

[Operation] The balloon-shaped blocks remain embedded in the slab even after construction. Therefore, the balloon-shaped block has air pressure inside that can withstand the load of the slab, and
The container needs to be strong enough not to break, but if it is made of plastic, it can be manufactured at low cost, so there is no need to collect it. When laying the blocks, the balloon-shaped blocks can be deformed by adjusting the air pressure inside, so they can be packed into any area and spread evenly with ease.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show embodiments of the present invention.
Similar to the conventional method shown in Figs. As a method for horizontally supporting the slab formwork 5, the present invention supports the slab formwork 5 by laying a large number of balloon-shaped blocks 9.

The balloon-shaped block 9 is a collapsible cubic or rectangular container 9 made of synthetic resin such as plastic and having enough rigidity to maintain its original shape to some extent.
A is molded as shown in Fig. 2, and air is blown into the container 9a to pressurize it to make it into a balloon shape. The air pressure can be adjusted by letting the air out, and by lowering the internal air pressure, the entire structure can be deformed by external pressure.

The method for supporting slab formwork according to the present invention is that after the underground beams 4 are constructed, in the spaces formed between each underground beam 4,
As shown in FIG. 1, a large number of balloon-shaped blocks 9 are spread uniformly and stacked in a required number of layers so that the top surface of the top layer is equal to the top surface of the underground beam 4. At this time, the balloon-shaped blocks 9 are prepared in advance in various sizes such as cubes and rectangular parallelepipeds, and if there is a gap when laying the blocks between the underground beams 4, use balloons that match the size of the gap. In addition, if there is no balloon-shaped block 9 with a thick size that fits the gap, the balloon-shaped block itself is deformed and set by adjusting the internal air pressure. Even when stacking a large number of balloon-like blocks 9 upward and raising the upper surface level at the top stage, the sizes of the balloon-like blocks 9 to be spread are selected and the internal air pressure is adjusted while setting.

When the balloon-shaped blocks 9 are spread between the underground beams 4 in this way, the slab formwork 5 is laid on the upper surface thereof, and the slab formwork 5 is supported by a large number of balloon-like blocks 9. Once the slab formwork 5 is laid out, concrete is placed thereon and on the upper surface of the underground beam 4 to construct the slab 6. After constructing the slab 6, the slab formwork 5 and balloon-shaped blocks 9 are left as they are and buried.

In the above, balloon-shaped block 9 used in the method of the present invention
By making the slab formwork 5 freely foldable, workers can easily transport it to the site in the folded state, and when using it, it can be easily made into a cube or rectangular parallelepiped by blowing air into it. The work before supporting can be done easily and quickly, and work efficiency can be improved.

[Effect of the invention 1 As described above, according to the method for supporting slab formwork of the present invention, blocks made of balloons made by pressurizing air are placed in a container made of plastic or the like and used as a support material for slab formwork. Since the balloon-shaped blocks can be produced relatively inexpensively and can be buried even after the slab is constructed, there is no need to support the slab formwork and collect the slab after constructing it. There is no need to provide post-drill openings in slabs and underground beams, unlike when using conventional support hardware, and the work up to supporting the slab formwork can be done easily and quickly, improving work efficiency. In addition, balloon-shaped blocks can be manufactured in various sizes and can be deformed by adjusting the internal air pressure, so when laying them down, they are not only laid out without any gaps, but are also influenced by the unevenness of the ground. It can be spread evenly without any problems, and in this case, there is no problem of powder scattering that occurs when conventional foamed steel is deformed, and other excellent effects can be achieved.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention, FIG. 2 is an example of a balloon-shaped block used in the method of the present invention, and FIG. 3 is a schematic diagram showing the state when a slab is constructed on the ground. FIG. 4 and FIG. 5 are both schematic diagrams showing a conventional method of supporting a slab formwork. 1... Ground, 4... Underground beam, 5... Slab formwork,
6...Slab, 9...Balloon-shaped block, 9a...
Container (box type container), 9b...Air inlet.

Claims (1)

[Claims] (1) Make a balloon-shaped block by pressurizing air by pressurizing it into a box-shaped container made of synthetic resin, spread many balloon-shaped blocks and set it to the height where the slab formwork will be placed, until the required height is reached. A method for supporting slab formwork, which is characterized in that slab formwork is laid out and supported on top of spread balloon-shaped blocks.