JPS61183562A - Demolding of mold frame for molding horizontal slab with reinforcing rib - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for demolding a formwork for forming a horizontal slab with reinforcing ribs, and more specifically, the present invention relates to a method for removing a formwork for forming a horizontal slab with reinforcing ribs. The present invention relates to a method for easily removing a formwork used for a horizontal slab with one-way reinforcing ribs, which is one of the structures, after the poured concrete has hardened, and for making the formwork repeatable.

In recent years, medium-to-high-rise apartment buildings or medium-to-high-rise office buildings have been increasing.
In medium-to-high-rise buildings such as the above, there is a problem with sound insulation between the upper and lower floors, and in order to solve this problem, there is a tendency to increase the thickness of flat horizontal slabs.

However, increasing the thickness of a horizontal slab can have a significant mechanical impact not only on the slab itself but also on the entire building.

For example, an increase in vertical load manifests itself as an increase in horizontal load, which necessitates increasing the cross-sectional dimensions of structural members, which may result in an increase in material costs and push up the construction cost of the building. The situation can be seen.

In order to overcome these problems, it was devised to form reinforcing ribs on the lower surfaces of floors and ceilings.

In other words, by attaching reinforcing ribs to a flat horizontal slab, you can obtain the same effect as increasing the thickness of the horizontal slab, increase the moment of inertia, and effectively use reinforcing bars. Increase the strength and rigidity of the slab and reduce vibration.
This succeeded in improving noise isolation.

However, the work of attaching reinforcing ribs to this horizontal slab involves various problems.

The most problematic issue is that when forming the reinforcing ribs attached to the horizontal slab, in order to form the recesses between the reinforcing ribs, a formwork with the recess shape as the surface shape is used to pour concrete. It is troublesome to place the concrete on a suitable support, pour concrete from above, remove the support after the poured concrete has hardened, and then remove the formwork. It is severely damaged and soiled and cannot be reused.

Various methods have been proposed to make this work smoother, but typical ones include (1) applying a mold release agent to the outer surface of the formwork before pouring the concrete; Method (2) When demolding the formwork, since the outer surface of the formwork and the inner surface of the recess are in a vacuum, a through hole is bored between the top and bottom surfaces of the formwork, and the air is removed using the through hole. There is a method of press-fitting between the inner surface of the recess in poured concrete and the outer surface of the formwork.

However, method (1) has the disadvantage that the mold release agent used remains on the concrete surface after hardening, and removal of the residual mold release agent is troublesome. However, the poured concrete firmly adheres to the formwork, which not only makes it impossible to remove the formwork even when air is injected, but also causes damage and stains, making it difficult to withstand repeated use. .

The present invention was invented in view of the problems with the conventional methods described above, and the gist of the method is to remove concrete from the outside surface of the formwork. In order to prevent direct contact with the boundary layer, an air supply means is provided on the formwork side to pressurize air between the inner surface of the boundary layer and the outer surface of the formwork, and this formwork is placed on the support. After the placement, concrete is placed, and after the poured concrete has hardened, the support is removed and air is injected between the inner surface of the boundary layer and the outer surface of the formwork using an air supply means, thereby forming the formwork with the poured concrete and the boundary layer. By removing the formwork from the mold, it is possible to prevent the formwork from coming into direct contact with the poured concrete, making it easier to remove the formwork, and also preventing damage and staining of the formwork, making it suitable for repeated use. It is a command to endure.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the method for forming a horizontal slab with reinforcing ribs according to the present invention will be disclosed below with reference to the accompanying drawings.

The formwork 1 whose surface shape is the shape of a recess formed by ribs on the lower surface of a horizontal slab forming a floor, ceiling, etc. has an upper surface 1a.
A through hole 2 is provided that penetrates between the bottom surface 1b and the bottom surface 1b.
By an appropriate method such as coating or fitting on the outer surface except for b (hereinafter, the outer surface is defined as excluding the bottom surface),
The boundary layer 3 is coated so that the inner surface of the boundary layer and the outer surface of the formwork 1 are in close contact or close contact.

Such a formwork 1 is coated with a boundary layer 3 on a support A formed by, for example, laying a formwork plywood 5 horizontally on the upper surface of a pobeam 4 made of a steel frame or the like. With the bottom surface 1b, which is not covered, facing downward, a spacer 6, which is either integrated with or separate from the formwork 1 of a substantially plate-like body as shown by the dashed line in the figure, is interposed in the gap between them, or with the spacer 6 interposed therebetween. It should be placed appropriately without causing any problems.

After that, on the upper surface of the support A on which the formwork 1... is placed,
Concrete 7 is poured from the upper surface of the formwork 1 to a thickness that provides the strength allowed as a horizontal slab, and after the poured concrete 7 has hardened, it is formed with the bow beam 4 and the formwork plywood 5. One end of a tube 8 such as a pipe or hose is connected to the through hole 2 of the formwork 1, the other end of the tube 8 is connected to a compressor (not shown), and the through hole is removed. 2. Air is forced into the space between the outer surface of the formwork 1 and the inner surface of the boundary layer 3 by an air supply means B composed of a pipe body 8 and a compressor.

Therefore, the formwork 1 is removed with the boundary layer 3 remaining in the poured concrete 7. Thus, reinforcing ribs D are formed on the horizontal slab C.

The boundary layer 3 may be left in the poured concrete 7 or removed.

If a lubricant such as lubricating oil is appropriately interposed between the inner surface of the boundary layer 3 and the outer surface of the mold 1, the mold 1 can be demolded more easily.

At this time, the presence of the boundary layer 3 prevents the lubricant from remaining in the poured concrete.

If at least one side surface of the outer surface of the sea urchin is sloped, the poured concrete becomes a draft angle against the force pressing the formwork 1 from five directions, making the work of demolding the formwork even smoother. effective.

In this case, it is also considered that the through hole 2 is bored through the space between the inclined side surface of the outer surface and the bottom surface 1b.

Here, the formwork 1 is made of metal such as steel plate, foamed polystyrene,
The block shape or only the external shape is formed from materials such as foamed urethane foam, foamed polyethylene foam, rubber, plywood, etc.

When the formwork 1 is formed of a plate-shaped material, the bottom surface 1b is made an opening surface, and the through holes 2 as the air supply means B may be provided by a method described later.

As the boundary layer 3, a thin sheet made of a synthetic resin such as polypropylene, polyethylene, or vinyl chloride is used, or the same material as the sheet is coated.
The fitting relationship is made by curing after application, or by vacuum forming, press forming, etc. from synthetic resin such as polyethylene, vinyl chloride, steel plate, plywood, etc., with the inner surface shape matching the outer surface shape of the formwork 1. The outer surface of the formwork 1 is coated by the following methods. In particular, using a polyolefin plastic such as polypropylene, which has a small coefficient of friction, as the synthetic resin has a great effect on demolding work.

If a material that does not easily deform under the pressure of poured concrete is used as the boundary layer 3, instead of the through hole 2 penetrating between the upper surface 1a and the bottom surface 1b of the formwork 1, the boundary layer 3 may be formed between the upper surface 1a and the bottom surface 1b. It is also possible to form a groove on the side surface 1c and use the groove as the air supply means B. Furthermore, this does not preclude applying a mold release agent to the outer surface of the boundary layer 3.

FIG. 2 shows another embodiment of the air supply means B, in which the air supply part E of the air supply means B has a substantially box-like shape with a hollow interior that is thin-tubular or thin-walled. , an air outlet main body 9 in which a continuous opening or a discontinuous opening is provided on the peripheral edge side of the upper surface plate to form an air outlet 9a, and an opening into which a pipe body described later can be inserted is provided in the lower surface plate. Then, insert the air outlet into the opening of the lower plate of the air outlet main body 9 until the edge comes into contact with the inner surface of the upper plate, and form an appropriate number of holes 10a in the insertion portion existing in the box body, or Although not shown, the pipe 10 is shown as having a full size air flow path pipe 10 with the end edge of the tube facing the opening of the bottom plate of the box body and with no hole 10a formed in the insertion portion of the tube.

Therefore, a recess 11 having a depth such that the air supply portion E having the above configuration can be accommodated with the upper surface of the mold 1 and the surface of the air outlet main body 9 flush with each other is formed, and the recess 1
1 and the bottom of the formwork 1 are formed with through-holes 12 for inserting the press-fit air passage pipe 10 of the tubular body, one end of which is inserted into the opening of the bottom plate of the air outlet main body 9. It is installed inside.

The air feeding means B is constructed by connecting the air feeding portion E installed in the formwork 1 to an external compressed air blowing means such as a compressor (not shown). In the figure, 13 is a sealing member such as a packing.

Here, the lower surface plate of the main body of the air outlet 9, the side plate, and the pipe 10 located in the through hole 12 can be omitted as appropriate.

Further, if such an air supply portion E is used, it is convenient to provide the air supply means B on the side of the formwork 1 when the formwork 1 is formed of a plate-shaped material as described above.

An example of this is shown in FIG. Reference numeral 14 in the figure represents a holding member that is appropriately provided when the air supply portion E is installed in the formwork 1.

By providing the main body of the air outlet 9 in the air supply means B in this way, the main body of the air outlet 9 acts like a nozzle and efficiently connects the inner surface of the boundary layer 3 and the outer surface of the formwork 1. Air can be press-fitted.

In the embodiments shown in FIGS. 2 and 3, the side IC of the outer surface of the formwork 1 is made into an inclined surface to make it easier to remove the formwork 1 from the poured concrete 7. There is.

In the method for demolding a horizontal slab forming formwork with reinforcing ribs of the present invention as described above, the outer surface of the formwork is coated with a boundary layer, and an air supply means is provided on the formwork side. Because the poured concrete does not stick, and the air that is forced in between the inner surface of the boundary layer and the outer surface of the formwork applies pressure in the direction that the formwork is released, a draft is created on the side surface of the outer surface of the formwork. Even if an inclined surface is not formed,
It is possible to easily demold the formwork.

In addition, since the formwork does not come into direct contact with the poured concrete, there is little damage, no staining, and it can withstand repeated use, making it possible to estimate the cost required for formwork at a lower cost in construction costs. Also plays.

Furthermore, since no mold release agent is used, it is possible to beautifully finish the surface of the poured concrete after the formwork has been removed.

[Brief explanation of the drawing]

Figure 1 is a longitudinal cross-sectional view showing the formwork used in the construction method of the present invention placed on a support and concrete poured, and Figures 2 and 3 show the reliability of the formwork and air supply means. It is a longitudinal explanatory diagram showing travel sentiment. A: Support, B: Air supply means, C: Horizontal slab, D: Reinforcement rib, E: Air supply part. 1: Formwork, 2: Through hole, 3: Boundary layer, 4: Pobeam, 5: Plywood,
6: Spacer, 7: Concrete, 8
: pipe body, 9: air outlet main body, 10: pipe, 11: recessed part, 12: through hole, 13: sealing member. Patent applicant Kanebuchi Chemical Industry Co., Ltd. Figure 3 Figure 1 Figure 2

Claims (1)

[Claims] 1) A boundary layer with the poured concrete is coated on the outer surface of the formwork whose surface shape is the shape of a recess formed by ribs on the lower surface of the floor and ceiling, and a boundary layer with the inner surface of the boundary layer is formed. An air supply means is provided on the formwork side to pressurize air between the outer surfaces of the formwork. After the formwork is appropriately placed on the support, concrete is poured, and after the poured concrete hardens, the support is The body is removed and air is injected between the inner surface of the boundary layer and the outer surface of the formwork using an air supply means.
A formwork removal method for forming a horizontal slab with reinforcing ribs, which is obtained by removing the formwork from the poured concrete and boundary layer. 2) As an air supply means, a thin cylindrical or thin rectangular cylindrical inner hollow substantially box-like shape is provided with continuous openings or discontinuous openings on the end side of the periphery of the upper plate, and the lower plate is used as an air supply means. Insert the air outlet body into the opening of the lower plate of the air outlet body until the end edge abuts the inner surface of the upper plate, and make an appropriate number of holes in the insertion part. Formation of a horizontal slab with reinforcing ribs according to claim 1, comprising: a pipe body with a perforation therein; a compressor connected to the pipe body; and a formwork provided with the air supply means. Formwork removal method. 3) The method for demolding a horizontal slab forming formwork with reinforcing ribs according to claim 1, wherein a slipping material is interposed between the inner surface of the boundary layer and the outer surface of the formwork.