JP2009057726A - Bolt to be used to form concrete formwork - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bolt easy to fasten/unfasten when used to fix metal rib materials to both ends and the intermediate of a weir plate. <P>SOLUTION: The bolt 5 is used to form a concrete formwork 1. A stick piece 6 to be bitten into the sheathing board 2 is formed on the head of the bolt 5, and the bolt 5 is driven from the side of the sheathing board 2 into insertion holes 4 of the rib material 3 and the sheathing board 2. Thus, the idling of the bolt 5 is prevented to allow easy fastening/unfastening of a nut. After concrete is placed, the rib material 3 as an obstacle portion is easily dismounted in the state that the sheathing board 2 is left, and so the formwork is easily removed. Removal of the bolt 5 is facilitated when replacing the sheathing board 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a bolt used for forming a concrete formwork.

When placing concrete during the construction of a wall that is a concrete structure, after the reinforcement of the reinforcing bars that are the backbone of the concrete structure is completed, the concrete formwork (hereinafter simply referred to as the formwork) is placed on both sides of the reinforcement. In this case, a separate member is arranged between the opposing concrete molds so as to maintain the molds at a required interval, and the opposing concrete molds are tightened by the separate members, and Deploying and fixing the butter material that supports the back of the concrete formwork so as to support the load acting on the concrete formwork when placing concrete, and supplying concrete between the concrete formwork constructed in this way By doing (casting), the construction of the concrete structure is performed.

As for the structure of the concrete formwork, a method in which a formwork is generally used by using a crosspiece as a skeleton on a piling board such as a lauan plywood and a fixing member such as a nail on the piling board. However, wooden piers have the disadvantage that the stability of the material is inferior due to the instability of the strength due to the nodes and the distortion.

Because of this, in recent years, the durability and stability of drilling clip holes at regular intervals, aiming to reduce the cost of manufacturing concrete formwork, enable repeated use, and reduce costs. In particular, a concrete formwork for fixing a metal rib member to a plate such as a lauan plywood using a countersunk head bolt having a locking groove has attracted attention.

However, for the concrete formwork to fix the metal rib material that becomes a skeleton with clip holes perforated at fixed intervals, using countersunk head bolts having locking grooves at both ends and the middle part of a panel such as a control panel, When disassembling the formwork after placing concrete, if the rib material fixed at both ends becomes an obstacle, removing the metal rib material with the slat remaining is the removal of the nut due to the idle rotation of the countersunk head bolt. It is difficult to lock the screwdriver for preventing the bolt from spinning around due to the filling of the locking groove of the countersunk head bolt with concrete when replacing the plate after dismantling the formwork.
JP 2006-207367 A JP 2001-262825 A

The present invention has been made in view of the above-described points, and a metal rib material serving as a skeleton is a lavan plywood panel or a synthetic resin slat (hereinafter also simply referred to as a slat). Provided is a bolt used to fix the metal rib member to a portion, and a new bolt configuration that facilitates tightening and removal of the bolt.

The present invention has been made in view of the above-described points, and in manufacturing a concrete formwork, a bolt for fixing a metal rib material, which is a skeleton with perforated clip holes at fixed intervals, to both ends and an intermediate portion of a dam plate In order to prevent idle rotation of the bolt, the bolt formed with a piercing piece that bites into the dam plate on the bolt head is driven into the bolt insertion hole of the dam plate, and the rib material is inserted, and the nut is tightened or removed from one direction. Is to make it possible.

In the present invention, by forming a piercing piece that bites into the dam plate on the head of the bolt, it is possible to prevent rotation of the nut and to rotate a nut from one direction without using a partner, such as an impact driver. It is possible to operate with one hand, and it is possible to remove the rib material of the part that interferes with the dismantling of the concrete formwork with the retaining plate remaining, making the dismantling of the concrete formwork advantageous . Therefore, an effect of improving workability can be obtained by replacing the bolt by rotating the nut from one direction without requiring a counterpart.

Bolts that have bifurcated, trifurcated, quadrupled, etc. on the head of the bolt, which are formed with piercing pieces that bite into the plate, are used according to the material of the plate, and the plate is inserted into the insertion hole drilled in the rib material and plate The head of the bolt is driven in from the side, and the rib member can be tightened or removed from one direction with a nut, so that it becomes easy to remove the rib member in the part that becomes an obstacle after placing concrete. Specifically, in the case of a concrete form that is surrounded by four sides like an internal formwork and has a plurality of continuous lines, there is no gap to insert the bar, so first remove the rib material that interferes with the concrete formwork to be placed next to it. Demolding is facilitated by inserting the tip of the burl 14 into the clip hole formed in the mating rib member. From the second sheet, there is no adjacent mold, and the insertion of the burl 14 is facilitated.

Hereinafter, the present invention will be described in more detail based on the embodiments shown in the drawings. However, the present invention is not limited to this, and can be appropriately modified without departing from the technical idea of the present invention. Of course it should be understood.

FIG. 1 is a partial side view showing a state of use, in which a concrete mold 1 is inserted into a through hole 4 drilled in a plate 2 and a rib member 3 from the side of the plate 2 and driven with a hammer or the like. As a result, the piercing piece 6 formed on the head of the bolt 5 bites into the dam plate 2 and is fixed. Next, the nut 7 is screwed and tightened using a tool such as an impact driver, so that the rib material 3 is fixed to the dam plate 2 and the concrete mold 1 is formed.

2 is a side view of the bolt 5 in which two nail-like piercing pieces 6 are formed on the head, and FIG. 3 is a side view of the bolt 5 in which three nail-like piercing pieces 6 are formed on the head. FIG. 4 is a side view of the bolt 5 in which four nail-like piercing pieces 6 are formed on the head. Each bolt 5 is properly used depending on the material of the dam plate 2.

FIG. 5 is a cross-sectional view taken along line AA of FIG. 2 showing the piercing piece 6 of the head. FIG. 6 is a cross-sectional view taken along line BB in FIG. 3 showing the piercing piece 6 of the head. FIG. 7 is a cross-sectional view taken along the line CC of FIG. 4 showing the piercing piece 6 of the head.

FIG. 8 is a cross-sectional plan view showing the state of dismantling the concrete formwork. After the concrete is placed, since the internal formwork surrounded by the four sides has no gap for inserting the burl 14, The other side concrete material frame 1 is removed by removing the rib material 3 on one side, inserting the tip of the burl 14 into the clip hole 15 formed in the rib material 3 on the other side, and kneading it in the direction of the broken line shown in FIG. Is easily removed. Therefore, when removing the nut 7 of the bolt 5 that fixes the rib material 3 in order to remove the rib material 3 on one side, the head of the bolt 5 can be locked and fixed to prevent the bolt 5 from spinning around. is important.

The partial side view which shows the use condition of the volt | bolt concerning this invention The side view of the volt | bolt which formed the latching | locking part two places in the head of the volt | bolt concerning this invention The side view of the volt | bolt which formed three latching | locking parts in the head of the volt | bolt concerning this invention The side view of the volt | bolt which formed the latching | locking part four places in the head of the volt | bolt concerning this invention AA line sectional view of FIG. BB sectional view of FIG. CC sectional view of FIG. Sectional plan view showing concrete formwork dismantling

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Concrete formwork 2 Brake plate 3 Rib material 4 Insertion hole 5 Bolt 6 Piercing piece 7 Nut 8 Separate member 9 Concrete 10 Concrete formwork clamp 11 Clip metal 12 Batter material 13 Temporary stop tab 14 Bar 15 Clip hole

Claims (2)

  A bolt for fixing a plate such as a lauan plywood to a metal rib material that becomes a skeleton in a concrete formwork, and forming a piercing piece that bites into the piercing plate at the head of the bolt, the piercing A bolt used for forming a concrete formwork characterized in that a piece is locked and fixed on a dam plate to prevent idle rotation and a nut is rotated from one direction to facilitate tightening and removal. Bolts to fix the slats such as lauan plywood to the metal ribs that form the skeleton of the concrete formwork, and easily remove the ribs that form the skeleton while leaving the slats after the concrete is placed Bolts used to form concrete formwork, characterized in that

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