Partition wall

Abstract

Highly fluid ready-mix concrete seeps into the gap between the sponge mold and the slab bottom (formwork), causing the sponge mold to lift. Furthermore, labor costs are currently incurred for chipping away the concrete that leaks out after it has hardened. [Solution] By using the present invention product instead of the conventionally installed rafters, it is possible to prevent the intrusion of fresh concrete into the slab bottom (formwork) and the bottom of the sponge mold, thereby preventing the sponge mold from floating. Previously, rafters were lined up to secure the pouring height (slab height) of the fresh concrete, but by using the present invention product, the pouring height of the fresh concrete can be secured, and because it adheres closely to the slab bottom (formwork), it is possible to prevent the sponge mold from floating. This eliminates the need to hire specialized contractors and leads to a reduction in unexpected labor costs due to chipping work after pouring, making it economical. Furthermore, since rafters are not required, it is characterized by a reduction in building material costs, a reduction in industrial waste, and a significant reduction in time, cost, and labor costs.

Description

Technical Field

[0001] The present invention is a formwork for preventing fresh concrete for a slab with a plate-shaped slit.

Background Art

[0002] Currently, as a method of joining when placing fresh concrete in slabs being constructed at a construction site, in the case of beams and walls, lath nets, air injection tubes, etc., and in the case of slabs, lath nets, sponge types, etc. are mainstream. For lath nets, a specialized contractor is requested to install them.

[0003] In recent years, for the work of preventing fresh concrete (concrete stop work) during the placement of fresh concrete in slabs, the opportunity for on-site earthwork workers to install a relatively easy-to-construct sponge type has been increasing. However, in the conventional concrete stop work using a sponge type, since the sponge type was installed by a specialized contractor, it could be installed without gaps. However, because the sponge type is relatively easy to construct, earthwork workers have started to install it. Although the construction itself is easy, the adhesion of the sponge type becomes loose, so at present, when high-strength concrete with high fluidity is used, floating occurs due to gaps between adjacent ones and leakage from under the sponge type.

[0004] Furthermore, after removing the sponge type after the concrete has hardened, it is necessary to level the leaked and hardened concrete before the next placement can be carried out. Therefore, at present, unexpected labor costs are incurred for the leveling work.

[0005] The concrete stopping work using this invention can be easily performed with just a short explanation and instruction. Since the installation of conventional sponge-type concrete blocks is mainly done on-site, the sponge block is installed on-site as before. Then, in the conventional method, a row of lumber (square timbers) is placed in front of the sponge block (on the concrete pouring side), and these lumbers are secured with wire. Because only the lumbers are secured, the sponge block cannot be fixed, and the concrete flowing below the lumbers is stopped by the sponge block. By simply securing the invention with wire instead of the lumbers, installation becomes easier, and leakage from below is prevented by covering the entire sponge block. Since the lumbers that were previously disposed of as industrial waste are no longer used at the end of the project, costs are reduced and waste is minimized.

[0006] Furthermore, highly fluid, high-strength concrete is difficult to remove once it adheres, making cleaning difficult and accelerating the deterioration of the sponge mold itself. The present invention uses a flexible and high-strength material, such as polypropylene resin, which is used in cutting boards and other kitchen utensils in recent years, as its raw material. Therefore, during dismantling, after removing the sponge mold, the binding wire can be cut, and the present invention can be easily removed by tapping it with a rubber hammer or similar tool from the pouring side in the direction from which the sponge mold was removed.

[0007] By using this invention, it becomes unnecessary to hire a specialist contractor for concrete slab jointing methods, leading to significant reductions in time, cost, and labor expenses. [Prior art documents] [Patent Documents]

[0008] [Non-Patent Document 1] Japanese Patent Publication No. 2007-085148

[0009] [Non-Patent Document 2] Japanese Patent Application Publication No. 09-088342 [Overview of the project] [Problems that the invention aims to solve]

[0010] The problem we are trying to solve is that, in concrete pouring slabs, the relatively easy-to-install sponge molds are increasingly being used by on-site earthworkers to secure the concrete. However, while conventional concrete securing work using sponge molds was done by specialized contractors, ensuring a seamless installation, the ease of installation has led to earthworkers installing them themselves. Although the installation itself is simple, the adhesion of the sponge molds becomes looser, resulting in gaps between adjacent molds and the sponge molds lifting due to leakage from below, especially with highly fluid, high-strength concrete. Furthermore, after the sponge molds are removed following concrete hardening, the leaked and hardened concrete must be chipped away and leveled before the next pour can be made, resulting in unforeseen labor costs that cannot be avoided. [Means for solving the problem]

[0011] The concrete-stopping work using this invention can be easily performed with just a short explanation and instruction. While the installation of conventional sponge-type concrete blocks is mainly done on-site, the sponge-type block itself is still installed on-site. However, in the conventional method, thick timbers were lined up horizontally in front of the sponge-type block and secured with wire. This invention, however, simply replaces these timbers with the product secured with wire, simplifying the installation process. Furthermore, since the timbers that were previously disposed of as industrial waste are no longer used, costs and waste are reduced. Additionally, this invention features a slit-shaped cutout in the part that contacts the slab reinforcement, allowing it to be installed on the front side (the side where the ready-mix concrete is poured) of the installed sponge-type block, minimizing contact between the ready-mix concrete and the sponge-type block.

[0012] Furthermore, highly fluid, high-strength concrete is difficult to remove once it adheres, making cleaning difficult and accelerating the deterioration of the sponge mold itself. The present invention uses a flexible and high-strength material, similar to polypropylene resin, which is used in cutting boards and other kitchen utensils in recent years. Therefore, during dismantling, after removing the sponge mold, the binding wire can be cut, and the present invention can be easily removed by tapping it with a rubber hammer or similar tool from the pouring side in the direction from which the sponge mold was removed. By using the present invention, it becomes unnecessary to rely on specialized contractors for the method of joining ready-mix concrete slabs, leading to significant reductions in time, cost, and labor expenses. [Effects of the Invention]

[0013] The concrete sealing work described in this invention can be easily performed with just a short explanation and instruction. By using the product of this invention, the leakage of fresh concrete from gaps in the sponge-type concrete due to poor contact with the sponge-type concrete, which was a problem when performed by non-specialist contractors, and especially the lifting of the sponge-type concrete due to leakage from the bottom of the sponge-type concrete, can be minimized. As a result, it becomes unnecessary to rely on a specialist contractor for concrete sealing methods when pouring fresh concrete for slabs. Furthermore, since thick timbers are not required, building material costs can be reduced. In addition, since chipping work after the fresh concrete hardens is greatly reduced, it is characterized by a reduction in industrial waste and a significant reduction in time, cost, and labor costs. [Brief explanation of the drawing]

[0014] [Figure 1] Figure 1 shows a typical slab reinforcement diagram (cross-section). [Figure 2] Figure 2 is a typical slab reinforcement diagram. [Figure 3] Figure 3 shows the installation status of the sponge-type, thick-ended corner piece. [Figure 4] Figure 4 shows the installation status of the partition wall (side view). [Figure 5] Figure 5 shows the installation status of the partition wall (front view from the pouring side). [Figure 6] Figure 6 shows the concrete pouring joint (side view).

Best Mode for Carrying Out the Invention

[0015] Since the product of the present invention is only fixed with a wire instead of a square bar, the construction can be easily carried out. At the end of the construction site, the square bar, which was disposed of as industrial waste, is not used, so the cost can be reduced and the waste can be decreased

Examples

[0016] FIG. 3 shows a conventional construction method in which a square bar 5 is fixed with a wire so as to be higher than the slab top surface when placing fresh concrete. It is 5 that is fixed with a wire, and 4 is only inserted.

[0017] 7 in FIG. 3 is the product of the present invention, and like 5 in FIG. 2, it can be easily installed above the slab top surface.

[0018] In the case of FIG. 3, when fresh concrete invades the gap between the lower part of 4 and 3, since 4 is a sponge, a phenomenon occurs in which the fresh concrete pushes up 4.

[0019] In FIG. 4, the product 7 of the present invention is plate-shaped and is fixed with a wire as shown by 6 in FIG. 4, so it is easy to make the bottom part of 7 contact closely with 3. Therefore, the invasion of fresh concrete into the lower part of 7 can be minimized.

[0020] In the conventional construction method of FIG. 3, 5 is fixed with a wire, but since 4 is not fixed, a phenomenon occurs in which 4 floats.

[0021] In order to prevent such a phenomenon, by fixing the product of the present invention with a wire in front of 4 (the fresh concrete placing side), there is an effect of minimizing the invasion of fresh concrete into the lower part of 4.

Examples

[0022] The embodiment shown in Figure 6 involves fixing the product 7 of the present invention to the concrete pouring side of the sponge-type 4 with binding wire. This eliminates leakage of fresh concrete from the top of the slab and greatly helps solve the problem of poor adhesion of the lower part 3 of 4, which had been a problem in terms of post-construction treatment. [Industrial applicability]

[0023] This eliminates the need to hire specialized contractors. Furthermore, since thick timbers are not required, building material costs can be reduced. In addition, because chipping work after the ready-mix concrete has hardened is significantly reduced, it leads to a substantial reduction in industrial waste, time, cost, and labor expenses. [Explanation of symbols]

[0024] 1. Slab reinforcement (reinforcement) 2. Slab reinforcement (main reinforcement) 3. Concrete formwork (slab bottom) 4 Sponge mold 5 thick corner Platform 6 7 Partition Walls 8. Ready-mix concrete

Claims

[Claim 1] This is a concrete-stopping member used at the joint surface when pouring fresh concrete for a slab. It is a plate-shaped member with slits cut out in the part that contacts the slab reinforcement, according to several slab reinforcement pitches, so that it does not interfere with the slab reinforcement and adheres tightly to the slab bottom (formwork), and the upper part has cutouts for fixing with binding wire, which simplifies construction. By fixing it with binding wire, it prevents fresh concrete from entering the lower part of the sponge-type mold and prevents the sponge-type mold from lifting, and is characterized by minimizing leakage of highly fluid, high-strength concrete.

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