JP2011007024A - Open-form holding bracket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To overcome problems of a form for a floor opening of a reinforced concrete building, wherein, though the concrete around the form is disassembled after being solidified, since the upper part of the form is made slightly larger than the lower part to facilitate disassembly, namely, a draft is provided thereto, the shaft of an anchor using a long nut attached at right angle to the side plate of the form is buried while being tilted by the same angle as the draft of the side plate, and therefore, several tens of deformed reinforcements screwed with the anchor later are also tilted temporarily, and much labor and time are required for correcting these reinforcements horizontally.SOLUTION: The four corners of the form are held with a pair of brackets made of a steel angle and fixed, while the side plate of the form at the floor opening is vertically installed. However, since the brackets have a structure as shown in Figs. 2 and 3, the brackets can be easily disassembled and removed from a solidified slab irrespective of the fact that the side plate is installed vertically. Then, the deformed reinforcements screwed with the anchor are stored horizontally, and can be welded without bending the deformed reinforcements brought into contact with these deformed reinforcements so as to face each other.

Description

  The present invention relates to a floor opening formwork in a reinforced concrete building. In the construction site, an opening is provided on the floor as needed for raising and lowering tools and the like. Since this opening part must be finally finished to a floor having a reinforcing bar based on a predetermined construction procedure, the formwork for constructing the opening part must take that into consideration. In other words, it must be a formwork having a mechanism that allows the reinforcing bars installed in the opening to be the floor at a later date to be constructed so as to have the same effect as the reinforcing bars in other parts of the floor.

  Conventionally, an anchor using a long nut for fixing the reinforcing bar is previously installed in the opening formwork of the floor because it is necessary to arrange a reinforcing bar based on the construction procedure as described above before placing concrete in the opening. ing. That is, one end of the reinforcing bar is spirally processed in the same spiral mountain as the long nut, and this is screwed into the long nut of the anchor to fix the reinforcing bar. Since this anchor is installed in a symmetrical position on the two opposite faces of the four sides of the formwork, the other ends of the rebars that are screwed together are on the same line as seen in plan view and are joined by welding After that, the raw control is placed in the opening.

As described above, the formwork of the floor opening is disassembled after the concrete around the formwork is solidified, but the upper part of the formwork is made slightly wider than the lower part in order to facilitate disassembly. Therefore, the anchor shaft using the above-mentioned long nut attached at right angles to the side plate of the formwork is not horizontal but is inclined at the same angle as the draft of the side plate. .
As a result, the reinforcing bars as described above screwed into the anchors of the opposite side plates are located on the same straight line when seen in a plan view, but when viewed from the side, they are in a crossing relationship with each other. When welding reinforcing bars, each reinforcing bar is bent and welded to a horizontal position.
As described above, from the viewpoint of the labor of bending several tens of reinforcing bars to a horizontal position and the so-called rebar covering accuracy, it is desirable that the side plate of the mold is positioned vertically.

  As a result of diligent research, the present inventor has invented a method in which the above-described four side plates of the open mold frame can be easily disassembled even if they are stored vertically. In other words, a pair of angle steels are provided at the four corners of the formwork, fixed with the side plates sandwiched between them, and after the concrete is solidified, the angle steels can be removed from the inside, that is, from the opening side. We succeeded in dismantling the entire form consisting of the side plates.

Hereinafter, the present invention will be described in detail with reference to the drawings.
FIG. 1 is an image view of an opening mold using a mold holding metal fitting according to the present invention, where reference numeral 1 is a side plate reference numeral 2 is a metal plate which is formed of a pair of angle steels at four corners of the mold and holds the reference numeral 1. Reference numeral 3 is an anchor in which a short reinforcing bar is welded to a long nut, and is fixed via the reference numeral 1 until the concrete placed around the opening mold is solidified by a bolt 4.
FIG. 2 is a detailed image diagram of the reference numeral 2 according to the present invention, in which the reference numeral 5 is an angle steel for holding the reference numeral 1 from the outside, and the reference numeral 6 is a round steel for determining the position of the reference numeral 1 and is welded to the reference numeral 5. . Reference numeral 7 is a long nut and is also welded perpendicularly to the reference numeral 5. Reference numeral 8 is an angle steel that suppresses reference numeral 1 from the inside, and has a through hole of reference numeral 9 having a diameter slightly larger than the outer diameter of the long nut at a position where it interferes with the long nut of reference numeral 7. Therefore, by screwing the wing nut of the reference numeral 10 with the long nut of the reference numeral 7, the angle steel of the reference numeral 9 can be pressed, and the side plate of the reference numeral 1 sandwiched between the pair of angle steels can be fixed. .
FIG. 3 is a top view of the outer angle steel described above, where reference numeral 11 indicates that the long nut number 7 is easily and firmly welded, and when the mold is disassembled, the angle peelability is improved. For chamfering. In addition, the inclination process of reference numeral 12 is also for improving the peelability.
FIG. 4 is an image diagram when the single-helix deformed reinforcing bar 13 is screwed to the anchor 3 described above after dismantling the formwork, and the number of deformed reinforcing bars to be screwed in order to avoid complication of the figure. It is drawn by subtracting. As shown in the image diagram, the opposite deformed reinforcing bars are in contact with each other horizontally to facilitate welding. Therefore, so-called rebar cover is also arranged at a predetermined position along the construction procedure. Reference numeral 14 denotes a slab around the opening.

  As described above, when the opening mold holding metal fitting according to the present invention is used, the deformed reinforcing bars screwed into the anchors are not inclined and stored on the side surfaces of the opening as in the prior art. The labor to bend to the position is not necessary, and the cover of the deformed reinforcing bar becomes accurate.

In a reinforced concrete construction site where a double reinforcement bar slab with a thickness of 180 mm, vertical and horizontal bars of D13 and pitch of 200 mm is constructed, an opening having dimensions of 400 mm in length and 1000 mm in width is placed in a formwork as shown in FIG. It was constructed. At this time, 24 anchors of the above-mentioned reference numeral 3 were used. The length of the deformed reinforcing bar of D13 subjected to the single helix processing was 250 mm in the vertical direction and 550 mm in the horizontal direction.
The concrete on the floor around the opening was placed under the above conditions, and then the formwork was disassembled on the 7th day, but all the formwork members were removed in about 15 minutes, and there was nothing in the disassembly work. No hindrance was observed.
Further, in the temporary installation test of the D13 reinforcing bar subjected to the single helix processing performed the next day, the opposing reinforcing bars were joined at the horizontal position, and it was confirmed that there was no problem in the final welding of the reinforcing bars.

  Opening formwork image   Image of mold holding hardware   Top view of outer angle steel   Image of opening

DESCRIPTION OF SYMBOLS 1, Side plate 2, Formwork holding metal 3, Anchor 4, Bolt 5, Outer angle steel 6, Positioning round steel 7, Long nut 8, Inner angle steel 9, Through hole 10, Wing bolt 11, Chamfer 12, Chamfer 13 , Single helix deformed bar 14, slab

Claims (1)

3. A metal object composed of three elements as shown in FIG. 2, which can be easily disassembled while vertically installing a side plate of the form frame in a form of a slab opening of a reinforced concrete structure.
The metal hardware is composed of a pair of angle steels that are fixed by sandwiching the side plates of the mold frame at the four corners of the mold frame. Of these, the angle steels arranged outside the mold frame and in contact with the concrete are denoted by reference numerals 11 and 12 in FIG. Since the chamfering process is performed, the angle steel can be easily removed at the final stage of dismantling.
On the other hand, the angle steel indicated by reference numeral 8 arranged on the inner side of the formwork is screwed together with a wing bolt indicated by reference numeral 9 and a long nut indicated by reference numeral 7 welded to the outer angle steel described above, thereby allowing the side plate indicated by reference numeral 1 to be used. Can be easily dismantled as well.

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