JPH06322778A - Footing beam/foundation concrete form construction method - Google Patents

Abstract

PURPOSE:To maintain a horizontality on the top of a form even when the surfaces of a permanent form are rough and uneven. CONSTITUTION:L-shaped members 1 and 2 are loosely connected to each lower end of a pair of net-shaped boards having reinforcing materials 5 and 6 at the upper edges. The L-shaped members are separated from each other at a specified spacing and installed side by side and fixed on a permanent form. The reinforcing materials 5 and 6 for each of the net-shaped boards 3 and 4 are temporality fixed at a predetermined home position. The connection between each of the net-shaped boards 3 and 4 and each of the L-shaped members are solidified. A spacer 15 is inserted outside from one of the opposed net-shaped board 3 and 4 into the other net-shaped board where reinforcing members 11 and 13 mounted at both ends which penetrate each net-shaped board of the spacer. A reinforcing member 9, which controls a specified width, is mounted between the reinforcing materials 5 and 6 for each of the net-shaped boards 3 and 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a concrete formwork for an underground beam / foundation of a concrete structure.

[0002]

2. Description of the Related Art In the conventional formwork method, a face plate made of plywood or a metal plate is installed in a predetermined shape, and these are fixed by more supports than the outside, and concrete cast in the formwork is required. This is a method of removing the face plate and the support work after hardening to the strength of. However, such a conventional formwork method requires a large number of face plates to be installed without gaps and to be fixed so as not to shift, which is extremely complicated work. In view of such problems, a mold construction method has been devised which simplifies the manufacture of the mold using standardized materials. For example, Japanese Patent Publication 2-527
No. 47 or Japanese Unexamined Patent Publication No. 3-132525.

The outline of the mold construction method described in Japanese Patent Publication No. 2-52747 is as follows. That is, at least one surface of the mold is formed by a metal mold material of a horizontal rung and a vertical rung provided with a plurality of claws on one side surface and a wire mesh, and is provided on the metal mold material during assembly. With the claws facing inward, a shaft set is formed between two horizontal bars through a plurality of vertical bars, and a wire mesh is hooked on the claws and attached to the inside of the shaft set. The face materials thus assembled are erected so as to face each other to form a form, concrete is placed between the forms, and the framework is removed after the concrete is hardened.

Further, in the formwork method described in Japanese Patent Laid-Open No. 3-132525, a dam plate horizontal angle member is fixed at the foundation footing construction position on the upper surface of abandoned concrete, and then the adjacent corners of the foundation footing are adjacent to each other. After mounting the vertical L-shaped corner metal fittings between the horizontal angle members, the square pipes are fitted and fixed between the square tubular parts of the adjacent corner metal fittings, and the same corner pipes are assembled to the cross girder. A weir plate is attached across the inner surfaces of the square tubular portion and the weir plate stopping horizontal angle member of the corner metal fitting, and then a width stop member is attached in a cross shape across the opposing square pipes. Is.

[0005]

In the conventional formwork method as described above, the vertical dimension is based on the discarded concrete, but the surface of the discarded concrete has many irregularities (maximum 4 to 4 per 1 meter in length). There is unevenness of about 5 cm.), And it is difficult to secure the levelness of the upper surface of the mold.

The present invention has been made to solve the above problems, and even when the surface of the discarded concrete has irregularities, the levelness of the upper surface of the formwork can be secured and the assembly and disassembly can be easily performed. The purpose is to provide a method of constructing a concrete formwork for underground beams and foundations.

[0007]

In the method for constructing a concrete formwork for an underground girder / foundation according to the present invention, an angle member is loosely connected to each lower end portion of a pair of mesh plates having a strip member at the upper edge. A step, a step of separating the angle members from each other for a predetermined period of time, fixing the waste materials to the concrete, a step of temporarily fixing the strip members of the mesh plates to preset reference positions, and the mesh plates. A step of making the connection with each angle member firm, and inserting a spacer from one outer side of the opposing mesh plate over the other mesh plate, and stiffening members at both ends of the spacer penetrating each mesh plate. And a step of attaching a reinforcing member that regulates a space between the strip members of each mesh plate to a predetermined width.

Further, the upright piece of each angle member is provided with notches extending from the upper end portion to the bent portion at a plurality of positions in the longitudinal direction thereof.

[0009]

Since the angle members are loosely connected to the lower ends of the pair of mesh plates, the height direction can be adjusted when temporarily fixing the strip members of each mesh plate to the preset reference position. is there. Further, since the lower end portions of the mesh plate are connected to the angle members, workability at the time of temporary fixing is good.

By providing a notch in the standing piece of each angle member, each angle member can be bent following the unevenness of the discarded concrete.

[0011]

1 is a perspective view of a concrete formwork constructed by the method for constructing a concrete formwork for an underground girder / foundation according to the present invention. First, the members used in the method for constructing an underground girder / foundation concrete formwork according to the present invention will be described with reference to FIG. 1, 2 are fixed on the upper surface of discarded concrete,
It is an L-shaped metal fitting that holds a lower end portion of a face material described later in a predetermined width dimension. The L-shaped metal fittings 1 and 2 are manufactured by bending a thin steel plate of about 0.8 mm, and one piece is discarded and fixed to the upper surface of the concrete, and the other piece is set upright. Notch 1 on the standing piece of L-shaped metal fittings 1 and 2.
a and 2a are provided, and by providing the notch 1a, it is possible to bend following the unevenness of the discarded concrete. Further, the fixed pieces of the L-shaped metal fittings 1 and 2 are provided with convex portions 1b and 2b over the entire length in the longitudinal direction.

Reference numerals 3 and 4 are mesh plates (lath sheets), and the mesh plates 3 and 4 constitute the face material of the concrete form.
Reference numerals 5 and 6 are reinforcing members attached to the upper end of the mesh plate 3, and the reinforcing members 5 and 6 are formed of round bars having a diameter of about 9 to 19 mm. Note that, as shown in FIG. 2, the L-shaped metal fitting 1 and the mesh plate 3 are adjustable loosely, and the mesh plate 3 and the reinforcing member 5 are rigidly connected in advance by annealed wire. L-shaped bracket 2
The same applies to the mesh plate 4 and the mesh plate 4 and the reinforcing member 6.

Reference numerals 7, 8 and 9 denote reinforcing members which are attached to the upper surface of the concrete formwork to prevent the entire concrete formwork from moving laterally or being largely bent.
As shown in FIG. 3, the reinforcing member 7 is made of L-shaped steel having a width of about 50 mm to 75 mm and a length of about 3.0 to 5.0 m. As shown in FIG. Is tied up with. The reinforcing member 9 has a width of 35 mm to 50 mm as shown in FIG.
It is made of L-shaped steel having a length of about 1.0 mm and a length of about 1.0 to 2.0 m, and cut portions 9a and 9b for fitting to the upright pieces of the reinforcing member 7 are provided at both ends thereof. Reference numerals 11 and 13 are stiffening materials for preventing the mesh plate 3 from being deformed outward by the lateral pressure of the cast concrete. The stiffening materials 11 and 13 have a diameter of about 30 mm to 50 mm as shown in FIG. It is made of steel pipe. Further, elongated holes 11a, 13a and 11b, 13b that are long in the longitudinal direction are provided in the upper and lower portions of the stiffening members 11, 13. Further, notches 11c and 13c are provided at the lower ends of the stiffeners 11 and 13, respectively.

Reference numeral 15 is a spacer for keeping the width of the concrete formwork constant. FIG. 6 is an explanatory diagram for explaining the structure of the spacer 15. As shown in FIG. 6, male screw portions 15a and 15b are formed at both ends of the spacer 15. Further, in the middle portion of the spacer 15, there are provided protrusions 15c and 15d which engage with the mesh plates 3 and 4 to keep the width of the concrete formwork constant. 17,18
Are nuts screwed into the male screw portions 15a and 15b, respectively, and the nuts 17 and 18 are protrusions 15c and 15d, respectively.
At the same time, the mesh plate 3 and the stiffening members 11 and 13 are held.

7 and 8 are explanatory views for explaining the method for constructing a concrete formwork of the present invention. FIG. 7 is a front sectional view of the concrete formwork under construction, and FIG. 8 is a side view thereof. . In the figure, 20 is excavated soil, 21 is reinforcing bar, and 23 is waste concrete placed on the excavated soil 20. Hereinafter, a method for constructing a concrete formwork will be described with reference to FIGS. 7 and 8. Abandoned concrete 23
A reference line indicating a predetermined position in the width direction is marked out on the upper surface of, and the L-shaped metal fitting 1 is discarded along the reference line and fixed to concrete 23 by nailing or the like. At this time, discard the fixing piece of the L-shaped metal fitting 1 and bend it according to the unevenness of the concrete 23,
Make sure there is no gap between the concrete and the waste concrete 23. By doing so, it is possible to securely fix the L-shaped metal fitting 1, and it is possible to prevent the concrete from leaking from the lower end portion of the formwork when pouring the concrete.

Next, the reinforcing member 5 is temporarily fixed to the reference line 25 which indicates the position of the upper surface of the mold which is set in advance. At this time, since the L-shaped metal fitting 1 and the mesh plate 3 are loosely connected to each other by the smoothing number line, the position of the reinforcing member 5 can be adjusted in the vertical direction according to the reference line. The above-mentioned temporary fixing is performed by preliminarily stiffening a required number of stiffening members as shown in FIG. 5 on the L-shaped metal fitting 1 and tying the stiffening members 5 to the stiffening members with annealed wire. After temporary fixing,
The annealing number line connecting the L-shaped metal fitting 1 and the mesh plate 3 is aligned with the position of temporary fixing and tightly connected. The same work is performed on the L-shaped metal fitting 2 and the reinforcing material 6 on the opposite surfaces.

Next, the reinforcing members 7 and 8 are tightly connected to the reinforcing members 5 and 6 by means of a smoothed wire. The reinforcing members 7 and 8
Alternatively, the reinforcement members 5 and 6 can be tightly connected in advance with a spoiler wire. Further, the length adjustment of the reinforcing member in the longitudinal direction is performed by tightly connecting a plurality of reinforcing members with a tie line as shown in FIG. Next, the spacer is inserted from the outside of one mesh plate 3 to the other mesh plate 4, and then the male screw portion of the spacer 15 is inserted with the elongated holes of the stiffening members 11 and 13. Then, as shown in FIG. 10, the notches 11c and 13c at the lower ends of the stiffening members 11 and 13 are engaged with the protrusions 1b and 2b provided on the fixing piece of the L-shaped metal fitting 1, and then the nuts 17 and 18 are engaged.
Tighten the male screw by screwing. FIG. 11 shows a state during assembly at this time.

Next, the notches 9a and 9b of the reinforcing member 9
Is engaged with the upright pieces of the reinforcing members 7 and 8, and the width and the large curve of the form are adjusted while tightly connecting with the number lines. At this time,
As shown in FIG. 2, the reinforcing member 9 and the reinforcing members 7 and 8 form a truss structure. When the attachment of the reinforcing member 9 is completed, concrete is poured. After the concrete hardens to a certain strength, the reinforcing material 5 and the reinforcing member 7,
Nuts 17, 18, stiffeners 11, 13, male screw portion 15
Remove in the order of a and 15b. These removed parts will be reused.

Although the mesh plate is used as the face material in the above embodiment, it is also possible to use a thin steel plate provided with spacer insertion holes instead of the mesh plate.

[0020]

As described above, in the present invention, the lower end of the net-like plate is firmly fixed after the upper end of the net-like plate is temporarily fixed, so that even if the surface of the discarded concrete has irregularities. The horizontalness of the upper surface of the mold can be ensured. Further, since the lower end portions of the mesh plate are loosely connected to the angle members, workability in temporarily fixing the upper end portion of the mesh plate is good.

Further, since the notch extending from the upper end to the bent portion is provided at a plurality of longitudinal portions of the upright piece of each angle member, each angle member can be bent following the unevenness of the discarded concrete, and the formwork can be bent. There is no gap at the lower end of the. As a result, it is possible to omit construction work such as mortar for preventing concrete leakage, and improve work efficiency.

[Brief description of drawings]

FIG. 1 is a perspective view of a concrete formwork constructed by a method for constructing an underground girder / foundation concrete formwork according to the present invention.

FIG. 2 is an explanatory diagram illustrating a connected state of an L-shaped metal fitting, a mesh plate, and a reinforcing material used in the present invention.

FIG. 3 is a perspective view of a reinforcing member used in the present invention.

FIG. 4 is a perspective view of another reinforcing member used in the present invention.

FIG. 5 is a perspective view of a stiffening material used in the present invention.

FIG. 6 is a front view of a spacer used in the present invention.

FIG. 7 is a front cross-sectional view of the concrete formwork during construction.

FIG. 8 is a side view of FIG. 7.

FIG. 9 is an explanatory diagram illustrating a method of adjusting the length of the reinforcing member in the longitudinal direction used in the present invention.

FIG. 10 is an explanatory view illustrating the installation state of the lower end portion of the stiffening material used in the present invention.

FIG. 11 is a front view of the concrete formwork during construction.

FIG. 12 is an explanatory diagram illustrating a method of attaching a reinforcing member of the present invention.

[Explanation of symbols]

 1, 2 L-shaped metal fittings 1a, 2a Notches 1b, 2b Convex parts 3,4 Reticulated plate 5,6 Reinforcing material 7,8,9 Reinforcing member 11,13 Stiffening material 15 Spacer

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Yoshihito Sakamoto Marunouchi 1-2-2 Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Ryuji Kojima 4-4 Nihonbashi Hisamatsucho, Chuo-ku, Tokyo N Inside K-Trading Co., Ltd.

Claims (2)

[Claims] 1. A step of loosely connecting angle members to respective lower end portions of a pair of mesh plates having a strip member at an upper end edge thereof, and a step of separating the angle members from each other for a predetermined distance and fixing them to abandoned concrete. , Temporarily fixing the strips of each mesh plate to a preset reference position, firmly connecting each mesh plate and each angle member, and the outer side of one of the mesh plates facing each other. Through the spacer over the other mesh plate, attaching a stiffening member to both ends of the spacer that penetrates each mesh plate, and a reinforcing member that regulates the space between the strip members of each mesh plate to a predetermined width. A method of constructing a concrete formwork for an underground girder / foundation, characterized by comprising a step of attaching. 2. The underground beam / foundation according to claim 1, wherein the upright piece of each angle member is provided with notches extending from the upper end portion to the bent portion at a plurality of positions in the longitudinal direction thereof. Concrete formwork construction method.