JPH07252850A - Formwork for building foundation - Google Patents

Abstract

PURPOSE:To provide a lightweight formwork board excellent in execution property by rotatably connecting adjacent formwork boards made of a corrugated fiberboard, folding them into a flat shape at the time of transportation, and burying them under the ground after placing concrete. CONSTITUTION:A notch 12 is provided between adjacent formwork boards 11 so that they can be folded into a flat shape at the time of transportation, and a formwork 10 is constituted. The formwork board 11 is made of a cardboard such as a corrugated fiberboard, it is made lightweight, and it has good transportation and execution property. After the formwork boards 11 are carried in to the site, they are recovered to a rectangular shape and assembled with an adhesive, and connecting rods 14 are suspended to reinforce and fix them. The formwork 10 is assembled for the footing section of a building foundation, for example, concrete is placed, then soil is back-filled while the formwork 10 is not removed, and concrete is cured under the ground. The lightweight formwork 10 excellent in execution property can be obtained.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a formwork for a building foundation.

[0002]

2. Description of the Related Art Conventional building foundations are, as described in Japanese Patent Publication No. 56-29052 and Japanese Patent Publication No. 57-15728, before or after arranging reinforcing bars inside the root cutting built at the construction site. Then, a mold having a predetermined shape is constructed by joining a plurality of mold plates, and concrete is placed in the mold.

Here, the form frame plate forming the conventional form frame is made of a wooden or metal fixed-length plate. Then, the formwork is constructed by standing up on a predetermined straight line in a narrow space inside the root cutting while sequentially preventing each formwork plate from falling down one by one.

[0004]

However, the prior art has the following problems. It is necessary to stand the form plates one by one in a narrow place with high accuracy while paying attention to the prevention of the form plate from tilting or bending, which makes construction difficult.

In order to construct a mold having a predetermined shape corresponding to a building, a large number of mold plates are required, and the handling of these many mold plates is troublesome.

When a large number of mold plates are assembled in advance in a factory or the like into molds of a predetermined shape and used, the efficiency of transporting and storing the molds is poor. Further, in this case, the weight of the assembled form becomes large, which makes it difficult to load and unload the form on the transportation vehicle.
An object of the present invention is to construct a formwork for a building foundation with high accuracy and easily, and to improve the handleability and the transportation / storage efficiency.

[0007]

The present invention according to claim 1 is such that the side edges of a plurality of mold plates are rotatably joined to each other so that they can be folded. is there.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, the form plate is made of corrugated cardboard.

[0009]

According to the present invention described in claim 1,
Has the effect of. Since a plurality of formwork plates are integrated in advance so as to form a predetermined formwork at a factory, etc., a highly accurate formwork can be obtained by simply carrying it out in the folded state and then unfolding it. Can be formed. Therefore, it is possible to easily construct a highly accurate formwork on site without worrying about the tilting or bending of each formwork plate.

Since a plurality of mold plates are preliminarily joined and integrated, the handling such as transportation is good. In addition, at the transportation / storage stage, the entire formwork can be stacked in a folded shape, which improves transportation / storage efficiency.

According to the second aspect of the present invention, in addition to the above-mentioned items, the following actions are obtained. By making the form board made of corrugated cardboard,
The weight of the formwork constructed by assembling a plurality of formwork plates is not increased, and loading and unloading onto and from the transport vehicle is easy.

If a plurality of formwork plates are integrally formed of a corrugated paper which is a long continuous body and a cut is made between adjacent formwork plates, the adjacent formwork plates are easily bent at the cuts. Therefore, the foldable / unfoldable mold can be easily configured. Since the formboard made of corrugated paper is low in cost, it does not need to be reused and can be backfilled immediately after placing concrete without removing the formwork, greatly reducing the construction period and man-hours. , The productivity of foundation construction can be improved.

Corrugated cardboard does not hinder the environment because it naturally decomposes and fits in the soil even when it is buried in the ground, and since it has water retention properties, it is suitable for concrete curing.

[0014]

EXAMPLE FIG. 1 is a schematic view showing an example of a mold, FIG. 2 is a schematic view showing a mold plate connecting rod, FIG. 3 is a schematic view showing another example of the mold, and FIG. 4 is a foundation construction procedure. Fig. 5 is a schematic diagram showing an example of the foundation standing formwork used in an example of the foundation construction procedure, Fig. 6 is a schematic diagram showing another example of the foundation construction procedure, and Fig. 7 is a foundation diagram. FIG. 8 is a schematic diagram showing still another example of the construction procedure, FIG. 8 is a schematic diagram showing another example of the mold, and FIG. 9 is a schematic diagram showing still another example of the mold.

(Example 1 of Formwork) (FIGS. 1 and 2) In FIG. 1, 10 is a formwork for a building foundation. Formwork 10
Is foldable by integrally rotatably integrating the side edges of a plurality of (four in this embodiment) formwork plates 11. At this time, as shown in FIG. 1 (A), the mold 10 is formed by integrally forming the above-described four mold plates 11 with a paperboard which is a long continuous body, particularly preferably corrugated cardboard, and adjoining the molds. By forming a cut 12 between the frame plates 11 and 11, the adjacent form plates 11 and 11 are rotatable with respect to each other by the cut 12.

That is, in the mold 10, four mold plates 11 are previously integrated in a factory or the like so as to form a rectangular shape which is a predetermined mold shape, and as shown in FIG. 1 (B). Fold from a parallelogram into a flat plate shape by crushing from the side,
The foldable form 10 is stacked on a truck or the like in a stacked state, transported to the site, and then again developed into a rectangular shape for use.

The formwork 10 may be provided with a reinforcing bar support 13 at an appropriate height position of the formwork plate 11. The reinforcing bar receiver 13 is composed of an iron plate, a shelf dowel, etc., and may be attached to a predetermined position of the (a) formwork plate 11 in advance in a factory or the like, and (b) the formwork plate 1
It may be inserted and attached on the spot to the receiver setting position which is marked in advance at a predetermined position of No. 1 at a factory or the like. Formwork 10
By supporting the reinforcing bar on the reinforcing bar receiver 13, the positioning work for securing the covering thickness of the reinforcing bar (base reinforcing bar) becomes easy.

Further, as shown in FIG. 1 (A), the mold 10 is constructed by bridging a connecting rod 14 between facing mold plates 11 and 11 to fix the mold plates 11 and 11. May be. As shown in FIGS. 2 (A) and 2 (B), the connecting rod 14 has a flange 14 inside the threaded portions 14A and 14A at both ends.
B, 14B, and screw parts 14A, 14 at both ends
Caps 14C and 14C with internal threads can be screwed into A, the form plate 11 is sandwiched between the flanges 14B and the cap 14C on both sides, and the intervals between the facing form plates 11 and 11 are set to a predetermined interval.

The connecting rod 14 is set at the same height as the reinforcing bar receiver 13 and can also function as a reinforcing bar receiver. Further, as shown in FIG. 2 (A), the mold 10 may be provided with fall-prevention leg portions 15 on the lower outer surface of the mold plate 11. The leg portion 15 is made of paperboard or the like, and is integrally formed with the mold frame plate 11 at a factory or the like, or is attached to the mold frame plate 11 on the site by an adhesive agent or the like.

(Form Form 2) (FIG. 3) The form 20 shown in FIG. 3 is a modification of the form 10. The mold frame 20 has a U-shaped shape in which a part in the circumferential direction is open, whereas the mold frame 10 has a rectangular circumferential shape closed in the circumferential direction. That is, the mold 20 can be folded by rotatably integrating the side edges of the three mold plates 21. At this time, the mold 20 is similar to the mold 10 in that the above-mentioned three mold plates 21 are integrally formed by a paperboard which is a long continuous body, particularly preferably corrugated cardboard, and adjacent mold frames 21 are formed. By making a notch 22 between the two, the adjacent form plates 21, 21 are made rotatable relative to each other by the notch 22.

In this embodiment, the two molds 20 are butted at the site as shown in FIG. 3 (A), and the butted parts of both are assembled and integrated by the joining plate 24 as shown in FIG. 3 (B). As a result, a rectangular shape which is a predetermined formwork shape is formed. The joining plate 24 is joined to the outer surfaces of the formwork 20, 20 via an adhesive.

The joining structure of the abutting portions of the molds 20 and 20 does not use the joining plate 24, but as shown in FIG.
Alternatively, the inner projecting piece 23B, which is notched in the other frame 20, may be joined with an adhesive.

The means for joining the molds 20, 20 is not limited to an adhesive, but an adhesive tape, a clip, a stapler or the like may be used. In addition, even in the formwork 20, the formwork 10
Needless to say, similarly to the above, the reinforcing bar receiver 13, the connecting rod 14, and the fall preventing leg portion 15 can be provided.

(Example 1 of foundation construction procedure) (FIGS. 4 and 5) The construction procedure of the foundation using the mold 10 (substantially the same for the mold 20) is as follows.

(1) The formwork 10 is unfolded on a flat ground at the site to assemble a predetermined formwork shape (in the case of the formwork 20, further,
The two developed molds 20 are butted against each other to form a predetermined mold shape) (FIG. 14 (A)). In the present embodiment, the formwork 10 corresponds to the side surface of the footing portion F1 of the foundation (FIG. 5).

(2) The formwork 10 assembled as described in (1) above is carried into the inside of the root cutting 1 which has been built in advance at the site, and is installed at a predetermined position (FIG. 4 (B)). (3) The rebar 30 (Fig. 4 (C)) is placed at a predetermined position in the mold 10 installed in (2) above (Fig. 4 (D)).

The reinforcing bar 30 of this embodiment is composed of a base reinforcement 31 corresponding to the footing portion F1 of the foundation and a rising reinforcement 32 corresponding to the rising portion F2 of the foundation.
In addition, the form 10 is not deformed or displaced due to concrete pressure when pouring concrete.
As shown in FIG. 4 (D), (a) the periphery of the formwork plate 11 is fixed with soil, and (b) it is fixedly held by the hooked pin 16 inserted into the ground.

(4) Around the rising bar 32 of the reinforcing bar 30 in (3) above, the form 4 corresponding to the side surface of the rising part F2 of the foundation.
Set 0 (FIG. 5 (A)). This form 40 is supported by supports 41 that are driven into the ground on both sides of the root cutting 1.

The form 40 may be made of a wooden or metal form plate, but may be made of a paperboard such as corrugated paper similar to the form 10. (5) The concrete of the footing portion F1 is placed in the mold 10 (FIG. 5 (B)). This concrete is filled from the space between the upper end of the mold 10 and the lower end of the mold 40.

(6) The concrete upper surface of the footing portion F1 of the above (5) is covered with the plate member 42, and then the soil around the formwork 10 and the plate member 42 is backfilled to cover the concrete of the footing unit F1. This concrete is cured in the ground (FIG. 5 (C)).

(7) After the above (6), concrete of the rising portion F2 is placed in the form 40 of the above (4). still,
The form 40 of (4) may be installed after the footing portion F1 of (5) is concrete-cast.

(Example 2 of Foundation Construction Procedure) (FIG. 6) The foundation using the mold 10 may be constructed as follows. (1) Same as (1) of Example 1 of the above-mentioned foundation construction procedure (Fig. 6).
(A)). (2) The rebar 30 is placed at a predetermined position inside the root cutting 1 which has been built in advance on the site (FIG. 6 (B)).

(3) The formwork 10 assembled in (1) above is
It is carried in and installed at a predetermined position around the reinforcing bar 30 arranged in (2) (Fig. 6 (C)). In addition, the form 10 is not deformed or displaced due to concrete pressure when pouring concrete.
(a) The periphery of the formwork plate 11 is fixed with soil, and (b) it is fixed and held by a pin 16 with a hook inserted into the ground. (4) ~ (7) Same as (4) ~ (7) in Example 1 of the above-mentioned foundation construction procedure.

(Example 3 of Foundation Construction Procedure) (FIG. 7) The foundation using the mold 10 may be constructed as follows. (1) to (3) (1) to (3) in Example 1 of the above-mentioned foundation construction procedure,
Or it is the same as (1) to (3) in Example 2 of the foundation construction procedure.

However, in this Example 3, the reinforcing bar 30 is composed only of the base reinforcing bar 31 corresponding to the footing portion F1 of the foundation.
In addition, in this Example 3, the foundation rising block 50 is arranged inside the root cutting 1 before or after the reinforcement 30 is arranged inside the root cutting 1 or at the same time (FIG. 7 (A)). The foundation rising block 50 is precast in advance and preferably has a hook for connecting to the reinforcing bar 30 at the lower end thereof.

(4) Same as (5) in Example 1 of the above-mentioned foundation construction procedure. However, the concrete in this case is filled from the gap between the upper end of the mold 10 and the side surface of the foundation rising block 50. (5) Same as (6) in Example 1 of the foundation construction procedure described above.

The operation of this embodiment will be described below. Since a plurality of formwork plates 11 (21) are integrated in advance in a factory or the like so as to form a predetermined formwork shape, they can be easily unfolded after being transported to the site in a folded state. An accurate mold 10 (20) can be formed. Therefore, in the field, it is possible to easily construct a high-accuracy form without worrying about preventing the form plates 11 (21) from collapsing or bending.

Since the plurality of mold plates 11 (21) are preliminarily joined and integrated, the handling property such as transportation is good. In addition, at the transporting / storing stage, the entire formwork 10 (20) can be stacked in a folded shape, and transporting / storing efficiency is good.

Since the form plate 11 (21) is made of corrugated cardboard, the weight of the form 10 (20) constructed by assembling a plurality of form plates 11 (21) is not increased. It is also easy to load and unload on a transport vehicle.

A plurality of mold frame plates 11 (21) are integrally formed from a corrugated paper which is a long continuous body, and adjacent mold frame plates 11 are formed.
If the cuts 12 (22) are made between the (21), the adjacent formwork plates 11 (21) are cut into the cuts 12 (22).
Can be easily folded with (22) and can be folded /
The deployable formwork 10 (20) can be easily configured.

Since the mold plate 11 (21) made of corrugated paper is low in cost, it does not need to be reused, and the mold plate can be backfilled without removing the mold plate immediately after placing concrete. , Man-hours can be significantly reduced and the productivity of foundation construction can be improved. Corrugated paper is suitable for concrete curing because it does not hinder the environment because it decomposes naturally even if it is buried in the ground and fits in the soil.

Although the embodiment of the present invention has been described in detail above with reference to the drawings, the specific structure of the present invention is not limited to this embodiment, and changes in design within the scope not departing from the gist of the present invention can be made. Even if it exists, it is included in the present invention. For example, the formwork of the present invention may be one in which the side edges of a plurality of formwork plates are rotatably joined together, and as shown in FIG. 8, a plurality of formwork plates 61 forming a long continuous body. Circular mold 6 closed in the circumferential direction by
When forming 0, the one end portion 61A and the other end portion 61B of the long continuous body are not joined and the end portions 6 thereof are assembled at the time of assembling the mold.
1A and 61B may be simply butted.

Further, as shown in FIG. 9, the form plate 71 may be made of wood or metal, and adjacent form plates 71, 71 may be rotatably joined by a hinge 72.

[0044]

As described above, according to the present invention, it is possible to construct a formwork for a building foundation with high accuracy and easily, and it is possible to improve handleability and transportation / storage efficiency.

[Brief description of drawings]

FIG. 1 is a schematic view showing an example of a mold.

FIG. 2 is a schematic view showing a form plate connecting rod.

FIG. 3 is a schematic view showing another example of the mold.

FIG. 4 is a schematic diagram showing an example of a foundation construction procedure.

FIG. 5 is a schematic diagram showing a usage state of a foundation rising formwork in an example of a foundation construction procedure.

FIG. 6 is a schematic diagram showing another example of a procedure for constructing a foundation.

FIG. 7 is a schematic view showing still another example of the foundation construction procedure.

FIG. 8 is a schematic view showing another example of the mold.

FIG. 9 is a schematic view showing still another example of the mold.

[Explanation of symbols]

 10, 20 Formwork 11, 21 Formwork plate

Claims (2)

[Claims] 1. A formwork for a building foundation, characterized in that it is foldable because the side edges of a plurality of formwork plates are rotatably joined together. 2. The formwork for a building foundation according to claim 1, wherein the formwork plate is made of corrugated cardboard.