JPS6127422Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to an opening device for making an opening in a slab of a concrete structure.

Conventional technology Conventionally, paper tubes were used as a means of drilling openings in slabs when piping was installed through a concrete slab or when moving a reference mark from a lower floor to an upper floor. A method has been used in which the paper tube is fixed at an appropriate position, concrete is placed, and after curing, the paper tube is peeled from the concrete slab to form an opening, but this method has the following drawbacks.

Problems that the invention aims to solve: (1) The paper tube is fixed by nailing it to the slab formwork, which is time-consuming.

(2) Peeling the paper tube from the concrete slab is difficult and requires tools, which is inefficient.

Also, the paper tube is damaged when it is peeled off, so it cannot be used for other purposes.

(3) Normally, 1 to 2 days after concrete is poured, the ink is transferred to the upper floor, so the slab formwork at the bottom of the opening is penetrated with a crowbar, etc., so the formwork used for the opening is Cannot be used for other purposes.

(4) To close the opening, the concrete is placed from the lower floor and supported with supports, and then the opening is filled with concrete from the upper floor to close it, which makes the work difficult and inefficient.

Means for Solving the Problems This idea was devised in view of the above-mentioned conventional problems, and the purpose is to provide a concrete slab opening device that has a simple structure, excellent workability, and is economical. An opening forming body in which a fitting portion is connected to a cylindrical lower part that is tapered toward the lower end, a closing plate having an outer peripheral shape that is tapered like the opening forming body, and the first opening forming body. It is characterized by comprising a bottom plate having a fitting hole drilled at an appropriate position to removably fit the fitting part of the bottom plate.

Operation Place the bottom plate at the appropriate location between the slab forms, support the slab form and the bottom plate with supports, fit the fitting part of the opening forming body into the fitting hole, and pour concrete.

After the concrete has hardened, the problem with the previous model is solved by removing the opening forming body, closing the bottom of the opening with a closing plate, and filling the upper part of the opening with concrete. It is.

Embodiments Below, embodiments of this invention will be described in detail based on the drawings.

FIGS. 1A, 1B, and 1C are a perspective view and a front view in longitudinal cross section showing the structure of an opening device according to an embodiment of this invention.

Reference numeral 1 denotes an opening forming body in which a cylindrical fitting part 3 having the same diameter as the small diameter end 4 is connected to the lower part of the inverted conical part 2 .

Reference numeral 6 denotes a closing plate formed by providing a rib 8 inside an inverted conical dish-shaped portion 7 and forming an inverted conical slope to match the slope of the inverted conical portion 2 of the opening forming body 1. be.

10 is a bottom plate formed by drilling a fitting hole 12 in the center of a bottom plate main body 11 made of plywood, synthetic resin, etc. into which the fitting part 3 of the opening forming body 1 can be attached and detached.

An example of use of the opening device 1 according to the embodiment configured as described above will be described below.

As shown in FIGS. 2 and 3, the bottom plate 10 is placed at a suitable position between the slab forms F, the slab form F and the bottom plate 10 are supported by supports H, and the opening forming body 1 is placed in the fitting hole 12. The fitting parts 3 are fitted together, and concrete is poured.

After the concrete has hardened, the opening forming body 1 is removed, and the bottom of the opening is closed with a closing plate 6.
This will be repaired by filling the upper part of the opening with concrete C.

Note that any shape may be used as long as the fitting portion of the opening forming body in the above embodiment can be attached to and detached from another fitting hole.

Further, if a handshake is provided on the upper part of the opening forming body, it is easy to pull out.

Effects of the invention As explained above in detail, according to this invention, (1) The opening forming body is fitted and attached to the bottom plate, so the work is easy and the formwork is not damaged.

Further, the opening forming body can be reused.

(2) Since the opening forming body has an inverted conical shape, it can be easily removed without the need for tools after the concrete hardens.

(3) After pouring concrete, the fitting holes in the bottom plate can be used to transfer the ink to the upper floor, and there is no need to cut out the formwork as in the past, and the bottom plate can be reused.

(4) To close an opening, you can repair it by engaging a closing plate at the bottom of the opening and then filling the top of the opening with concrete, so you can support it by placing a plate from the lower floor as in the past. Work can be done on the slab without the need for it.

(5) After the opening forming body is fitted to the bottom plate, a closing plate can be inserted into the opening forming body to close the opening before concrete is poured, thereby preventing debris, tools, etc. from falling to the lower floor. It also has the side effect of preventing.

Thus, it is possible to obtain a concrete slab opening device that is extremely effective in practice.

[Brief explanation of the drawing]

Figures 1a, b, and c are perspective views and central vertical sectional front views showing the configuration of an opening device according to an embodiment of the invention, and Figures 2 and 3 are partial central vertical sectional front views showing the same state of use. and a central longitudinal sectional front view. DESCRIPTION OF SYMBOLS 1... Opening part formation body, 3... Fitting part, 6... Closure plate, 10... Bottom plate, C... Concrete.

Claims (1)

[Scope of utility model registration request] an opening forming body in which a fitting part is connected to a lower part of a cylinder whose outer periphery is tapered toward the lower end; a closing plate having an outer circumferential shape that is tapered like the opening forming body; and the opening. 1. A concrete slab opening device comprising: a bottom plate having a fitting hole drilled at an appropriate position to removably fit a fitting part of a part forming body;