JP2007032237A - Surfacing preventing metal fitting for void slab - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems in a conventional mounting operation for a metal fitting to prevent a void tube and a spiral tube for a void slab from surfacing when a readymixed concrete is deposited wherein an operation is required on the lower side of a form plywood on which the metal fitting is set, the operation is extremely dangerous and acerb, and a removal operation for the check part of the lower part of the metal fitting performed when the form is dismantled is also a dangerous operation. <P>SOLUTION: The void tube and the spiral tube can be installed by only an operation above the form plywood by using the metal fitting. Also, the removal operation for the check part projected from the lower surface of the form plywood when the form is dismantled can be extremely easily performed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

The present invention relates to the construction of void slabs for reinforced concrete buildings.
Floors or slabs in reinforced concrete buildings are often constructed with void slabs for the purpose of saving raw materials, reducing weight, and insulating sound. The present invention relates to a hardware that prevents the phenomenon of rebar lifting due to the buoyancy of a void tube or polystyrene foam used in the construction of a void slab.

  Conventionally, a hardware for fixing a void pipe or a spiral pipe for void slab to a predetermined height from a formwork veneer plate on the bottom surface of a slab laid when placing concrete, uses a hardware commonly called P-con. In the work of fixing the void pipe or the like using this hardware, it involves work on the ceiling of the floor below the floor, so that there are problems of so-called high-altitude work and reduced work efficiency. .

  Safe and efficient work to prevent void rebar lifting due to buoyancy received when placing concrete pipes and void pipes and spiral pipes for void slabs at a predetermined height from the formwork plywood plate on the bottom of the slab It needs to be a thing.

  As a result of diligent research, the present inventor succeeded in producing a hardware that can accommodate a void tube or a spiral tube at a predetermined height from a formwork veneer plate on the bottom surface of the slab and prevent the rebar from lifting. This hardware is characterized in that the void tube and the spiral tube can be fixed only by the work on the formwork floor plywood on the floor.

  Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is an image diagram of a hardware according to the present invention. Here, reference numeral 1 denotes an annealed iron wire for binding to a void tube or a reinforcing bar that tends to float when concrete is placed. Reference numeral 2 is a hole through which the annealed iron wire of reference numeral 1 passes. Reference numeral 3 is slightly thicker than the hole formed in the mold veneer plate in the main part, and when this hardware is placed on the mold veneer plate, it does not fall through the hole in the veneer plate. Reference numeral 4 is designed to be easily folded when the formwork is disassembled after the concrete cast in the constricted portion is solidified. The reference numeral 5 indicates that when inserted into a hole formed in the formwork plywood at the flowering portion, the blockage is blocked and passes through the hole, and then again flowered and the void tube or the reinforcing bar receives buoyancy. It has the function of catching and preventing these lifts. Reference numeral 6 is a portion whose cross section is a rectangle such as a hexagon so that a commercially available tool can be used when the constricted portion of the reference numeral 4 is twisted and cut. Is made of synthetic resin and is provided to the user in an integrated state by a screw mechanism or an adhesive.

  FIG. 2 is a cross-sectional view of a state in which a metal object according to the present invention is installed on a veneer plate of a mold, where reference numeral 7 denotes a veneer of the mold. As described above, the flower-like portion denoted by reference numeral 5 has a mechanism that can open larger than the hole formed in the veneer plate of the mold and resist buoyancy. FIG. 3 is a cross-sectional view of a state in which a void pipe arranged in the middle of a frame reinforcing bar is fixed by an annealed iron wire of reference numeral 1 using a hardware according to the present invention. 10 is also a lower end line. Reference numeral 11 denotes a void tube.

  As mentioned above, if the attachment work of floating bodies, such as a void pipe, is performed using the hardware by this invention, an operator can complete construction by the operation | work only on the said floor. Therefore, an operator can perform a work of attaching a void tube or the like safely and easily. Also, when disassembling the veneer plate of the formwork, the non-return function part can be easily cut and removed simply by twisting the rectangular part at the bottom of the present invention, and in addition, since the cut surface is coincident with the bottom surface of the slab, it is conventionally performed. There is no need for repair work after dismantling the formwork. As a result, a significant cost reduction can be achieved in terms of both a reduction in labor costs required for construction and a reduction in price as a product associated with the simple structure of the product of the present invention.

In the field where the slab thickness is 250 mm, the so-called D13 upper and lower bar reinforcement pitches are 150 mm, and the outer diameter of the void tube is 150 mm, the present invention product is voided using a total of 100 pieces of 10 pieces at a pitch of about 1 m in length and width. After the pipes were bound and fixed, concrete was actually placed and the presence or absence of the effect of preventing the rise of the void pipe was verified.
As a result, the lifting prevention hardware received about 200 kgf of buoyancy per piece, but withstands buoyancy in the same manner as the conventional product used in parallel at this site, and there was no problem at all. In addition, the processing time of the lower end portion of the present hardware that must be removed when the mold is disassembled was about 10 seconds for the product of the present invention compared to about 30 seconds for the conventional product.

  The image figure of this invention goods.   Sectional drawing when the lifting prevention metal fitting by this invention is attached to a formwork veneer board.   Sectional drawing when the void tube is bound and fixed with the product of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, Annealing iron wire 2, Annealing iron wire through hole 3, Main part 4, Constriction part 5, Flowering part for non-returning 6, Rectangular part 7, Formwork veneer board 8, Concrete upper end surface 9, Upper end reinforcement 10, Lower end reinforcement 11 , Void tube

Claims (1)

It is a construction hardware that prevents the rise of void pipes and rods that occur during the construction of void slabs, and it is extremely beneficial in terms of both workability and cost by having a flower-shaped part at the tip and a part confined in the middle. A bar-shaped building hardware having a characteristic shape made of synthetic resin.

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