JP2005344373A - Space holder for concrete form - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight thin-type space holder for a concrete form having required strength without forming ribs. <P>SOLUTION: This space holder is constituted to form outer engaging pieces 12 and inner engaging pieces 13 by press-molding a thin iron plate and bending both side edges of a plate-like body 11. Concrete pressure is not thereby supported by the thickness of the bent parts of the outer engaging pieces 12 but can be supported by the width of the outer engaging pieces 12. Further, T-shaped locking pieces 15 are formed, and their tips are bent and locked to the end parts of the form. The holder 10 can thereby be positively mounted to the concrete form. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a concrete formwork spacing holder.

As shown in FIG. 4, a conventional concrete formwork spacing holder a bends both ends of a plate-like body b made of an iron plate to form outer engagement pieces c, and the inner side of each outer engagement piece c. The middle part of the plate material a is cut and raised to form an inner engagement piece d that forms a pair with the outer engagement piece, and the engagement of the end portions of the concrete mold f with both engagement pieces c and d is performed. A structure in which the portion e is formed is provided.
According to the concrete formwork spacing holder a having such a structure, the lower ends of a pair of opposing concrete molds f are respectively fitted to the formwork engaging parts e, and the upper ends are respectively molds of different holders a. By fitting into the frame engaging portion e, both concrete molds f are erected and held at a predetermined interval.
Then, after the concrete g is hardened, the upper gap holder a is removed from the concrete mold f, and the concrete mold f is removed from the mold engaging portion e of the lower gap holder a, so that the lower gap holder is removed. The formwork engaging portion e exposed from the concrete g is separated by hitting the side surface of a with a hammer or the like.
JP 9-4225 A

In the interval holder a having the above-described configuration, when the concrete is placed, the pressure is supported by the thickness of the bent portion of the outer engagement piece c. Therefore, if the thickness of the plate-like main body b is insufficient, the outer engagement piece c The concrete form f cannot be erected and held at a predetermined interval. Therefore, the plate-like main body b is thickened, and further, a rib having a cross-sectional shape such as a corrugated shape or a mountain shape is formed to increase its strength.
Thus, the conventional spacing holder a is heavy because it uses a thick material that can withstand the pressure of the concrete, and is inconvenient to handle. Further, a space is generated on the back surface of the plate-like main body b by the rib, and a nest due to the space of the rib is generated in the hardened concrete g, and the strength of the concrete g may be reduced. Furthermore, a gap is generated between the bottom surface of the mold frame f and the foundation concrete h due to the unevenness of the ribs, and the concrete poured between the mold frames f leaks from the gap, so that the appearance of the surface of the foundation concrete h is impaired.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a concrete formwork spacing holder that is light and thin and has a required strength without forming ribs.

The invention according to claim 1 is a concrete formwork spacing holder disposed between the lower ends of both concrete molds in order to keep a pair of concrete molds arranged opposite to each other at a predetermined distance. Outer engagement pieces are bent at both side edges of both ends in the longitudinal direction of the plate-like main body, and inner engagement pieces that are paired with the respective outer engagement pieces are bent at both side edges of the intermediate portion in the longitudinal direction of the plate-like main body Forming and forming a formwork engaging part with which the end of the concrete formwork is engaged by both the inner and outer engaging pieces.
Preferably, a notch is formed in the vicinity of the inner engagement piece of the mold engagement portion, and the plate-like main body is broken from the notch so that the outer engagement pieces can be separated.
Preferably, an inclined end portion is formed on an upper end of each outer engagement piece facing the inner engagement piece, and an inclination is formed on an upper end of each inner engagement piece facing the outer engagement piece. When the end portion is formed and the lower end portion of the concrete formwork is engaged with the formwork engaging portion, the lower end portion is configured to be dropped into the formwork engaging portion along both inclined end portions.
Further, preferably, a locking piece is formed by bending between the outer engaging pieces formed by bending on both side edges, and the front end of the locking piece is bent at the end of the concrete formwork engaged with the formwork engaging part. To be locked.

The method for using the concrete formwork spacing holder according to the present invention is as follows. Install the distance holder at a predetermined location on the foundation concrete surface, and fit the lower end of one of the pair of inner and outer concrete formwork between the inner end of the outer engagement piece and the outer end of the inner engagement piece. Combine. Similarly, the lower end of the other mold is fitted to the other mold fitting. In addition, a spacing holder is also attached to the upper ends of the pair of inner and outer concrete molds to hold both molds upright at a predetermined distance.
Concrete is poured between both molds standing and held by the gap holder, and after the concrete has hardened to some extent and pressure applied to the mold disappears, the mold is removed from the gap holder. Since the formwork engaging part is exposed from the hardened concrete, the outer engaging piece is separated from the vicinity of the inner engaging piece.
According to the distance holder according to the present invention, the outer side engagement piece and the inner side engagement piece are formed by bending both side edges of the plate-like main body. Rather than supporting the concrete pressure with the thickness, the width concrete pressure of both engaging pieces can be supported.
Therefore, the thickness of the plate-like main body can be reduced as much as possible to reduce the weight, and the required strength can be ensured without forming ribs.
Then, by forming the notch portion in the vicinity of the inner engagement piece of the mold engagement portion, the outer engagement pieces can be easily separated when the plate-like main body is broken from the notch portion.
In addition, by forming the inclined end portions at the upper end portions of the outer engagement piece and the inner engagement piece, the lower end portion of the concrete mold can be dropped into the mold engagement portion along the inclined portion. The installation work of the frame becomes easy and the efficiency of construction improves.
Furthermore, the holder can be securely mounted on the concrete mold by forming a locking piece, bending the tip thereof and locking it to the end of the mold.

  A thin steel plate is press-molded to form a flat plate-like main body, and outer engagement pieces are bent at both side edges of both ends in the longitudinal direction of the plate-like main body, Inner engagement pieces that are paired with the outer engagement pieces are bent at both side edges to form a formwork engagement portion that engages the ends of the concrete formwork with the inner and outer engagement pieces. A notch portion is formed in the vicinity of the inner engagement piece of the mold engagement portion, and the plate-like main body is broken from the notch portion so that the outer engagement pieces can be separated. An inclined end portion is formed at an upper portion of each outer engagement piece facing the inner engagement piece, and an inclined end portion is formed at an upper portion of each inner engagement piece facing the outer engagement piece. And when engaging the lower end part of a concrete formwork with a formwork engagement part, it comprises so that the same lower end part may be dropped in a formwork engagement part along both inclination edge parts. A locking piece is formed between the outer engaging pieces that are bent on both side edges, and the front end of the locking piece is bent and locked to the end of the concrete formwork that is engaged with the formwork engaging part. Configure as follows.

  The present invention will be described below with reference to the drawings. FIG. 1 shows a concrete formwork spacing holder according to an embodiment of the present invention. The spacing holder is formed by press-molding a thin iron plate, two outer engagement pieces 12 at each end, four inner engagement pieces paired with each outer engagement piece, both ends The two intermediate bent pieces 14 and the two locking pieces 15 for connecting the inner engaging pieces are formed.

  The plate-like main body 11 is formed in a flat rectangular shape having no irregularities. The outer engagement piece 12 has a substantially square shape and is bent at right angles from both side edges of both ends in the longitudinal direction of the plate-like main body 11. Triangular engagement convex pieces 12 a are integrally formed at the upper corners inside the outer engagement pieces 12. An inclined end 12b is formed on the engaging convex piece 12a.

  The inner engagement piece 13 and the intermediate bent piece 14 are bent at right angles from both side edges of the intermediate portion in the longitudinal direction of the plate-like main body 11. The inner engagement piece 13 is provided higher than the intermediate bent piece 14, and an inclined portion 13 a is formed at an upper corner portion outside the inner engagement piece 13.

    Two outer engagement pieces 12 on one end side and two inner engagement pieces 13 adjacent to each other form a pair, and both engagement pieces 12 and 13 form a frame engagement portion 16 at one end of the plate-like main body 11. A partition is formed, and similarly, the mold fitting portion 16 is also formed on the other end side.

  A triangular notch 17 is formed in the mold fitting portion 16 adjacent to the inner engagement piece 13. The notch 17 extends from the side edge of the plate-like main body 11 in the body width direction, and the width of the plate-like main body 11 is narrowed by the notch 17, so that the plate-like main body 11 can be separated from the notch.

  The locking piece 15 has a substantially T-shape and is erected between the adjacent outer engaging pieces 12. The locking piece 15 is formed by punching a part of the mold fitting portion 16 into a T shape, and bending the punched piece at a right angle with respect to the plate-like main body 11. Arranged to align.

  Circular punched holes 18 are formed at a plurality of locations in the middle portion of the plate-like body 11 in order to reduce the weight. A nail hole 19 is formed between the adjacent outer engagement pieces 12.

  The structure of the concrete formwork spacing holder 10 according to the present embodiment is as described above, and the method of using the structure will be described below. As shown in FIG. 2, the interval holder 10 is installed at a predetermined location on the foundation concrete surface h, and the nail 20 is driven into the concrete surface h from the nail hole 19 to fix the interval holder 10. While the concrete mold 30 is tilted along the inclined portion 12 b of the outer engagement piece 12 and the inclined portion 13 a of the inner engagement piece 13, the concrete mold 30 is inserted until it hits the bottom surface of one of the mold engagement portions 16. The mold 30 is raised so as to make a right angle with the concrete surface h, and the lower end of the mold 30 is fitted between the inner end of the outer engagement piece 12 and the outer end of the inner engagement piece 13. As a result, the engagement convex piece 12a of the spacing holder 10 is engaged with the folded piece 31 provided on the back surface of the lower end portion of the mold frame 30, and the head of the T-type locking piece 15 is further bent to form the mold. Locks to the folded piece 31 of the frame 30. Similarly, the mold 30 is fitted to the other mold fitting 16. Subsequently, as shown in FIG. 3, two spacing holders 10 are respectively attached to the upper end portions of the concrete mold 30 to hold both the molds 30 upright at predetermined intervals.

  As shown in FIG. 3, after pouring concrete between the two molds 30 standing and held by the four spacing holders 10, the concrete is hardened to some extent and the pressure applied to the mold 30 disappears, and then the upper end of the mold The spacing holder 10 is removed, and then the mold 30 is removed from the spacing holder 10 embedded in the concrete. Then, since the formwork engaging part 16 is exposed from the hardened concrete, the formwork fitting part 16 is separated from the notch part 17 together with the outer engaging piece by hitting with a hammer.

According to the interval holder 10 according to the present embodiment, the outer side engagement pieces 12 and the inner engagement pieces 13 are formed by bending both side edges of the plate-like main body 11, so that the outer engagement is performed like a conventional interval holder. Rather than supporting the concrete pressure with the thickness of the bent portion of the piece 12, the concrete pressure can be supported with the width of the outer engagement piece 12.
Therefore, the thickness of the plate-like main body 11 can be reduced as much as possible to reduce the weight, and the required strength can be ensured without forming ribs.

  Since the notch 17 is formed in the vicinity of the inner engagement piece 13 of the mold engaging part 16, the mold fitting part 16 can be easily separated from the notch 17. In addition, since the inclined end portions 12b and 13a are formed at the upper end portions of the outer engagement piece 12 and the inner engagement piece 13, the lower end portion of the concrete mold 30 is moved along the inclined portions 12a and 13a. Can be dropped to 16. For this reason, the installation work of the formwork 30 becomes easy and the efficiency of construction improves.

  Since the T-shaped locking piece 15 can be formed, and its tip can be bent and locked to the end 31 of the mold 30, the holder 10 can be securely attached to the concrete mold 30.

It is a perspective view which shows the space | interval holder for concrete forms which concerns on the Example of this invention. It is a partially broken sectional view which shows the usage method of the space | interval holder. It is a perspective view which shows the usage method of the space | interval holder. It is a perspective view which shows the usage method of the space | interval holder for the conventional concrete formwork.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Space | interval holder for concrete formwork, 11 ... Plate-shaped main body, 12 ... Outer engagement piece, 12a ... Engagement convex piece, 12b ... Inclination part, 13 ... Inner engagement piece, 13a ... Inclination part, 15 ... Engagement Stop piece, 16 ... Formwork fitting part, 17 ... Notch part.

Claims (4)

A concrete mold spacing holder disposed between the lower ends of both concrete molds to hold a pair of opposing concrete molds at a predetermined interval, and both ends of the plate-like body in the longitudinal direction The outer engaging pieces are bent and formed on both side edges of the plate-like body, and the inner engaging pieces that are paired with the outer engaging pieces are bent and formed on both side edges of the intermediate portion in the longitudinal direction of the plate-like main body. A concrete formwork spacing holder, characterized in that a formwork engaging part with which an end of a concrete formwork is engaged is formed. The cutout portion is formed in the vicinity of the inner engagement piece of the mold engagement portion, and the outer engagement piece is separable by breaking the plate-like main body from the cutout portion. Spacing retainer for concrete formwork. An inclined end portion is formed at an upper portion of each outer engagement piece facing the inner engagement piece, and an inclined end portion is formed at an upper portion of each inner engagement piece facing the outer engagement piece. When the lower end portion of the concrete mold is engaged with the formwork engaging portion, the lower end portion is dropped into the formwork engaging portion along both inclined end portions. The spacing holder for concrete molds according to 1. A locking piece is formed between the outer engaging pieces that are bent on both side edges, and the front end of the locking piece is bent and locked to the end of the concrete formwork that is engaged with the formwork engaging part. The interval holder for concrete molds according to claim 1, which is configured as described above.

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