JP2005220571A - Two-way concrete void slab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate installation of a void form 40 in upper-lower end reinforcements 2 and 3. <P>SOLUTION: This two-way concrete void slab is constituted so that the foaming resin void form 40 is arranged in a checker-like space S between the grating-like upper-lower end reinforcements 2 and 3, concrete is place, and the void form 40 is installed by locking on the upper-lower end reinforcements 2 and 3, by inserting and rotating in the checker-like space S, by arranging a projecting locking part 42 being a quadrangular shape in a plan view on a side surface of a columnar body 41. Thus, installation work is facilitated, and at this time, since the locking part 42 is locked on the upper-lower end reinforcements by resiliency of a foaming resin, the void form 40 can be surely fixed in the checker-like space S, to eliminate swelling of the void form 40 by placing the concrete. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a two-way concrete void slab in which lightweight void molds are arranged in a grid pattern between upper and lower ends, a construction method thereof, and the void molds.

As this type of two-way concrete void slab, for example, as shown in FIG. 8, upper floor bars 2 are arranged in a grid pattern on floor mold 1, and lower bar bars 3 are also arranged in a grid pattern. There is a structure in which a lightweight void 4 made of a foamed resin or the like is placed in each of the grid-like spaces S and concrete is placed (see Patent Documents 1 and 2).
Japanese National Patent Publication No. 6-502896 JP 2001-64391 A

In the construction of this two-way concrete void slab, it is necessary to prevent the void form 4 from being lifted and prevent the void form 4 from coming out of the space S of the upper and lower end bars 2 and 3 during concrete placement.
Conventionally, this has been prevented by connecting the void form 4 to the upper and lower reinforcing bars 2 and 3 by various means. For example, as shown in FIG. 8, auxiliary muscles 5 crossing each grid-like space S are spanned between the upper and lower muscles 2, 3, and the upper and lower surfaces of each void form frame 4 are suppressed by the auxiliary muscles 5 to lift them. I try to prevent it.
Further, a locking tool 6 straddling the auxiliary muscle 5 is inserted into the upper surface of the void mold 4 so as to prevent the lateral movement.

However, the arrangement of the auxiliary muscles 5 is troublesome, and the auxiliary muscles 5 must be arranged even when they are not necessary, which is wasteful. Further, it is troublesome to insert the locking tool 6.
This invention makes it a subject to make easy the attachment in between the upper-lower end muscles of a void formwork.

In order to achieve the above-mentioned object, the present invention is designed such that the light-weight void frame is inserted and rotated in the grid-like space between the upper and lower muscles, and the void frame is locked and attached to the upper muscle. is there.
In this way, the installation by inserting and turning has a very good workability.

  In the present invention, since the lightweight void frame is inserted and turned in the grid-like space between the upper and lower ends, the void frame is locked and attached to the end bars, so the upper and lower ends of the void frame Installation in the muscle is easy, and the workability is improved.

  As one embodiment of the present invention, a grid-like bottom stripe is provided in parallel with a vertical spacing so that the grid-like space in the grid coincides with the grid-like top stripe, and light in each of the spaces. In a two-way concrete void slab in which a void formwork is placed and concrete is placed, the void formwork can be fitted into the grid-like space from above at any position in the circumferential direction and required in the circumferential direction. It consists of a main body with a size and shape that can be rotated at an angle, and a locking part that protrudes laterally from the main body. The locking part can enter the space at a position where the main body can fit into a grid-like space. It is possible to adopt a configuration in which the position, size, and shape are set so as to be engaged with the lower surface of the upper end muscle at any other position rotated in the circumferential direction within the required angle from the position.

  When placing concrete in this configuration, buoyancy acts on the void formwork due to the concrete, and an upward force acts on it, but since the locking part is locked to the lower surface of the upper end muscle, the upward movement is blocked. The void formwork is fixed in the concrete at the required position in the grid-like space.

  At this time, if the locking part is also locked to the upper surface of the lower end line, the locking part is locked to both the upper and lower side bars, so that the void form frame is pulled out in the vertical direction in the grid-like space. There is no fear, and the void formwork is securely fixed in the concrete at the required position in the grid-like space. Further, if the locking portion is elastically locked to the upper and lower ends, the void form frame is more reliably attached to the upper and lower ends due to its elasticity. The elasticity can be easily obtained by forming the void mold with an elastic body such as foamed resin. As a material for the void form, a well-known lightweight material such as a hollow body or solid body made of foamed resin, metal, resin or the like is appropriately employed.

  Furthermore, if the body of the void form is an object extending from the grid-like space in the upper and lower muscles into the grid-like space in the upper muscle and the grid-like space in the lower muscle, There is no risk of the void formwork coming off in the horizontal direction in the grid-like space.

  The shape of the body of the void form may be any shape as long as it can be inserted into the grid-like space from above at any position in the circumferential direction and can rotate at a required angle in the circumferential direction. As seen in a plan view, it consists of an elliptical (including round) columnar body with the long side of the grid-like space as the long axis and the short side as the short axis. The shape which consists of the bulging part which protrudes in the diagonal direction of can be employ | adopted.

  In order to construct this two-way concrete void slab, for example, after placing the upper and lower bars on the floor mold, the void molds are placed upward in each grid-like space between the upper and lower bars. By locking the locking portion to the lower surface of the upper end muscle by fitting in and rotating in the circumferential direction, to prevent upward slipping between the upper and lower end muscles of the void mold, Place concrete.

FIG. 1 to FIG. 5 show an embodiment, and the void form frame 40 of this embodiment is made of a solid foamed resin, its main body 41 is a cylindrical body, and its center is square in plan view. Locking portions 42 protrude from the four side surfaces.
The diameter a of the main body 41 is the length of one side of the grid-like square space S between the upper and lower stripes 2 and 3, and the plan view square formed by the outer peripheral surface of the locking portion 42 is the grid-like square space. This is the same as the plan view of S. For this reason, the distance b between the apexes of the opposing locking portions 42 and 42 (in the diagonal direction) is longer than the side length a.

  Therefore, as shown in FIGS. 2 (a), 3 (a), and 4 (a), this void form 40 is fitted into a grid-like square space S between the upper and lower reinforcements 2 and 3. Then, as shown in each (b), the void form frame 40 is rotated 90 degrees, and the locking portion 42 is locked to the lower surface of the upper end muscle 2 and the upper surface of the lower end muscle 3 in a pressure contact state. After that, if necessary, auxiliary bars and the like are arranged and concrete is laid.

  The upper and lower reinforcing bars 2 and 3 are arranged in the same manner as in the prior art, and are connected and fixed by appropriate means so as to be parallel to each other so that the grid-like spaces S coincide with each other.

  As the shape of the void form 40, any shape can be used as long as it can be inserted from above at any position in the circumferential direction according to the size and shape of the grid-like space S and can be rotated by a required angle in the circumferential direction. But it ’s okay. For example, as shown in FIG. 6A, the main body 41 can be a quadrangular prism, and an elliptical cylinder as shown in FIG. 6B. An elliptic cylinder is suitable for a grid-like space S having a rectangular shape in plan view. Further, as shown in FIGS. 7C and 7D, a simple regular prism or elliptical cylinder is arranged in the space between the upper and lower ends 2 and 3 as shown in FIGS. 7C and 7D. Can be adopted. Further, as shown in FIG. 6 (e), the lower main body protruding portion can be deleted. The arrangement is as shown in FIG.

Schematic perspective view of one embodiment The operation | movement top view of the Example is shown, (a) is the state which inserted the void formwork in the board-like space, (b) is the state attached by rotating the void formwork in the board-like space. The operation | movement sectional drawing of the Example is shown, (a) is the state which inserted the void formwork in the board-like space, (b) is the state attached by rotating the void formwork in the board-like space. Operation perspective view of the embodiment The void formwork of the Example is shown, (a) is a perspective view, (b) is a plan view The perspective view of each Example of another void formwork Arrangement state schematic perspective view between upper and lower ends of the embodiment Schematic perspective view of a conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Floor form frame 2 Upper end muscle 3 Lower end muscle 40 Void type frame 41 Void type frame main body 42 Void type frame latching | locking part S Grid-like space

Claims (5)

Similar to the grid-like upper stripes 2, the grid-like lower stripes 3 are provided in parallel at intervals in the vertical direction so that the grid-like spaces S in the grid coincide with each other, and a lightweight void frame 40 is arranged in each space S. In the two-way concrete void slab with concrete C,
The void form frame 40 can be fitted into the grid-like space S from above at any position in the circumferential direction, and can be rotated by a required angle in the circumferential direction. The engaging portion 42 protrudes laterally, and the engaging portion 42 can enter the space S at a position where the main body 41 can fit into the grid-like space S, and is within the required angle from the position. A two-way concrete void slab characterized in that the position, size and shape are set so as to be engaged with the lower surface of the upper end reinforcement 2 at any other position rotated in the circumferential direction.   The main body 41 of the void mold 40 is formed in a grid-like space S in the upper end muscle 2 and in a grid-like space S in the bottom muscle 3 from within the grid-like space S between the upper and lower muscles 2 and 3. The two-way concrete void slab according to claim 1, wherein the two-way concrete void slab extends.   A main body 41 of the void form frame 40 is composed of an elliptical (including a round shape) columnar body having a long side as a long axis and a short side as a short axis in plan view. 3. The two-way concrete void slab according to claim 1, wherein the portion includes a bulging portion protruding in a diagonal direction of the grid-like space S from a side surface of the main body 41.   It is a method of constructing the two-way concrete void slab according to any one of claims 1 to 3, wherein the upper reinforcement 2 and the lower reinforcement 3 are arranged on the floor form 1, and then the upper reinforcement 2 and the lower reinforcement 3 The void form frame 40 is fitted in each of the grid-like spaces S from above and rotated in the circumferential direction thereof to lock the locking portion 42 on the lower surface of the upper end muscle 2 so that the void form frame 40. A method for constructing a two-way concrete void slab, comprising preventing upward slipping from between 40 upper and lower reinforcing bars 3 and then placing concrete C therein.   A void form for use in the two-way concrete void slab according to claim 1.

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