JP3984947B2 - Construction method of concrete foundation - Google Patents

Description

  The present invention relates to a method for constructing a concrete foundation mainly applied to a secondary structure such as a greenhouse or a simple structure such as a temporary structure.

  When building various structures, a concrete foundation is first constructed on the ground surface. Conventionally, in order to construct a concrete foundation, after assembling a formwork around, a method of placing a reinforcing bar in the formwork and placing concrete is generally used.

  As shown in FIG. 6, assembling the mold, first, mold panels 51 </ b> A to 51 </ b> D such as plywood or metal plate are built in the foundation construction site with foam ties 52, 52. Next, if the crosspiece 53 is arranged at the intersection of the adjacent formwork panels 51A to 51D and the formwork panels 51A to 51D are fixed to each other, the vertical end thick pipes 54, 54. Are arranged in the vertical direction on the outer surface side of the formwork panels 51A to 51D, and further, the horizontal end thick pipes 55, 55... Are arranged on the outer surface side of the vertical end thick pipes 54, 54. The end portions of 52, 52... Are fastened to the thick horizontal end pipes 55, 55.

  As described above, the formwork for constructing the concrete foundation requires many parts, and the construction of the formwork takes a lot of time and effort. For example, in the case of a structure such as a general building or a civil engineering structure, high quality and accuracy are required, so the above-mentioned method for installing the formwork must be followed. In the case of a simple structure such as a temporary structure, there has been a strong demand for a simplified form installation method separately from the above-described form construction method for cost reduction.

  Therefore, the main problem of the present invention is mainly for simple structures such as secondary structures such as greenhouses and temporary structures, and the number of formwork parts in order to construct the foundation of these structures. It is to provide a construction method of a concrete foundation that can reduce the work labor for installing the formwork and the construction cost.

As the present invention according to claim 1 for solving the above-mentioned problem , a long plastic film having a predetermined width is assembled in a ring shape so that the planar shape is circular at the foundation construction site. Installed by folding the lower edge side inward and penetrating the inner bent part on the lower edge side at a predetermined interval along the periphery, and fixing the ring-shaped plastic film to the support pile and assembling it inside A concrete foundation construction method is provided, in which concrete is placed using the ring-shaped plastic film as a mold after the reinforcing bars are arranged .

  In the present invention described in claim 1, a plastic film is used as the mold. The plastic film has a necessary and sufficient tensile strength as a mold, and if it is such a plastic film, it can be buried as it is, so that the work of installing and removing the mold can be greatly saved.

  Further, the plastic film mold is installed in a substantially circular shape in plan view. By making the mold shape circular, just like a circular vinyl pool, pressure in the outer direction of the mold is converted into the circumferential stress of the film when casting concrete, and the stress is equalized in the circumferential direction. Even if it is a simple fixing method using a support pile, the plastic film does not fall down, and the foundation shape does not become distorted and is formed into a perfect circle.

  Furthermore, the lower edge side of the plastic film mold was bent inward and fixed with the support pile. When the concrete is placed, the inner bent portion of the plastic film is pressed to the ground surface side by the weight of the concrete, so that the concrete leakage from the lower edge side of the plastic film can be effectively prevented.

As the invention according to claim 2, wherein the support pile and wood, plastic film how to build concrete foundation of the wooden support stakes formed by nailed claim 1 Symbol placement is provided.

In the invention according to the second aspect , as a method of connecting the support pile and the plastic film, it is desirable in terms of work that the support pile is made of wood and the plastic film is fastened to the wooden support pile.

  As described above in detail, according to the present invention, mainly for a simple structure such as a secondary structure such as a greenhouse or a temporary structure, a mold part for constructing a foundation for the structure is constructed. The number of points can be reduced, and the work labor for installing the formwork and the construction cost can be reduced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 is a side view of a greenhouse 1 to which the foundation construction method according to the present invention is applied, FIG. 2A is a view taken along the line IIA-IIA in FIG. 1, and FIG. 2B is IIB-IIB in FIG. FIG.

  The greenhouse 1 includes a frame 2 composed of pipes, H-shaped ropes, square steel pipes, C-shaped steel materials, and the like, and a solar permeable covering material 3 stretched on the outer surface of the frame so as to cover the space inside the frame. It consists of Since the greenhouse 1 according to this embodiment is a plastic house, a plastic film is used as the solar permeable covering material 3. Specifically, a hard film such as a polyester film or a fluorine film, or a soft film such as a polyolefin film such as a vinyl chloride film or a polyethylene film is used. On the other hand, the frame 2 has a plurality of horizontal connecting members 6, 6 in which a face member composed of intermediate face members 4, 4... And end face members 5, 5 is arranged along the horizontal direction (longitudinal direction). It is the structure connected by.

  In the present example, as shown in FIG. 2 (A), the intermediate face member 4 has side columns 7 and 7 arranged on both sides thereof arranged in parallel in the front direction cross section (transverse cross section). The two pillars 7A and 7B are formed into a composite pillar structure that is integrally assembled by connecting members such as diagonal members 8, 8,... And / or horizontal members 9, 9,. The main beam 10 spanned between the composite columns 7 and 7 is a beam member that is inclined obliquely downward from the substantially top of each composite column toward the center of the frontage and joined in the middle. Further, in the composite column 7, the height of the column 7A positioned relatively outside is made lower than the height of the column 7B positioned relatively inside, and the outside column 7A and the inside column 7B are connected to the curved beam. 11 is a combined structure. The outer column 7A and the curved beam 11 may be a continuous and integral member. In this example, the top of the outer column 7A and the top of the inner column 7B are connected by the curved beam 11, but may be connected by a straight beam.

  On the other hand, as shown in FIG. 2 (B), the end face member 5 has the same structure cross section and basic structure as the intermediate face member 4 described above, but in addition to this, the studs 12.12. The entrance / exit part is provided at a predetermined location. In addition, the wife pillar, the wife beam, the duck, etc. for forming the entrance / exit part are omitted from the drawing.

  In the present invention, when the foundation 13 of the greenhouse 1 is constructed, a plastic film is used as a concrete placement form as shown in FIG. For the convenience of arrangement, this plastic film should basically be made of the same material as the solar permeable covering material 3, but since it is used as a mold, it is desirable to have a high tensile strength. It is desirable to use a thicker material than the commonly used solar permeable covering material 3.

  The concrete construction method of the foundation 13 will be described in detail. A plastic film mold 14 shown in FIG. 3 is installed in the foundation construction site of the greenhouse 1 for placing concrete.

  Since this plastic film mold 14 is a stepped foundation whose center is raised in a columnar shape at the center, a lower plastic film mold 15 that constitutes a relatively large diameter lower foundation part mold. And an upper-stage plastic film mold 19 that constitutes the mold of the upper-side base portion having a relatively small diameter.

  First, the lower plastic film mold 15 is installed by assembling the plastic film 16 in a ring shape so that the planar shape is circular on the lower base part to be constructed, and at an appropriate interval in the circumferential direction of the plastic film 16. The plastic film 16 is fixed to the arranged wooden support piles 17, 17. At this time, the wooden support pile 17 is disposed on the inner peripheral side of the plastic film 16 and is fixed by a nail 18 driven from the outer surface side of the plastic film 16. In the illustrated example, both ends of the plastic film 16 are also fixed to the wooden support pile 17 with nails 18 so as to be assembled in a ring shape.

  In installing the plastic film 16, it is desirable that the lower edge portion of the plastic film 16 is bent inward, and the wooden support pile 17 is provided through the bent portion 16a. By thus forming the inwardly bent portion 16a at the lower edge portion, it is possible to effectively prevent the concrete from leaking outside from the lower edge portion when the concrete is placed. In addition, in the lower edge portion of the plastic film 16, it is preferable to make a vertical cut from the lower edge side at an appropriate position in the circumferential direction so that it can be easily bent.

  On the other hand, the upper-stage plastic film mold 19 basically has the same structure as the lower-stage plastic film mold 15, but the plastic film 20 is arranged with the top edge of the lower-stage foundation as the lower edge. Therefore, as the wooden support pile 21, one having a long pile length is used. In the illustrated example, four wooden support piles 21, 21... Are arranged at a circumferential position, and a plastic film 20 is fixed as a support material for the wooden support piles 21, 21.

  The plastic film molds 15 and 19 are assembled by placing the plastic films 16 and 20 in a ring shape, then installing the wooden support piles 17 and 21 on the ground, and attaching the plastic films 16 and 20 to the wooden support piles 17 and 21. It is also possible to nail it, or after installing the wooden support piles 17 and 21 first, the plastic films 16 and 20 may be installed, and further, the plastic films 16 and 20 and the wooden support pile 17 After assembling 21 in advance, the wooden support piles 17 and 21 may be installed in a manner to penetrate the ground.

  When the installation of the plastic film molds 15 and 19 is completed by the above procedure, the braided reinforcing bars 23 are arranged inside the plastic film molds 15 and 19. Next, as shown in FIG. 4 (A), after placing ready-mixed concrete 22A in the lower plastic film form 15 and reaching its top end, and waiting for its hardening, the upper plastic film is then placed. The ready-mixed concrete 22 </ b> B is placed up to the top of the inside of the mold 19.

  By the way, in the greenhouse 1 mentioned above, it became clear by analysis that a negative reaction force (uplift) is generated in the foundation 13 on one side when a wind load is applied. Therefore, in order to suppress the negative reaction force, as shown in FIG. 5, the soil cement 27 is filled around the relatively small-diameter upper base portion. In filling the soil cement in this case, the plastic film mold 24 can be used. As shown in the figure, wooden support piles 26, 26 are installed at appropriate intervals in the circumferential direction of the outer surface of the lower base portion, and the plastic film 25 is provided on the inner surface side of the wooden support piles 26, 26. Is fixed to the wooden support pile 26 with the nails 18 and 18. When the mold is ready, the soil cement 27 is filled into the plastic film mold 24.

  The method for constructing a concrete foundation according to the present invention has been described above using an example of a greenhouse, but this method can be applied to foundations such as prefabricated buildings, and can be applied to foundations of other general structures. It is.

[Other examples]
(1) In the above embodiment, the wooden support piles 17 and 21 are disposed on the inner surfaces of the plastic films 16 and 20 when the lower plastic film mold 15 and the upper plastic film mold 19 are installed. The wooden support piles 17 and 21 may be disposed outside the plastic films 16 and 20.
(2) In the above embodiment, the bottom surface is ground, but a plastic film cut into a circle may be laid on the bottom surface.
(3) In the above embodiment, the nails 18 are used to fix the plastic films 16 and 20 to the wooden support piles 17 and 21. It is also possible to fix it using a tool) or other driving tool such as a scissors.
(4) In the above embodiment, the wooden support piles 17 and 21 are used as the plastic film support members, but steel piles, reinforcing bars, steel bars, and the like may be used as the support piles.
(5) In addition to installing wooden support piles 17 and 21, steel piles, steel bars, steel bars, steel bars, etc., which are inserted into the ground as support members, You may make it install through a connection member or a spacer.
(6) The plastic films 16 and 20 and the wooden support piles 17 and 21 can be removed, but it is desirable to bury them if allowed.

1 is a side view of a greenhouse 1 to which a tunnel foundation construction method according to the present invention is applied. (A) is the IIA-IIA arrow directional view of FIG. 1, (B) is the IIB-IIB arrow directional view of FIG. FIG. 3 is a perspective view of an installation state of a plastic film mold 14. It is a concrete placement procedure figure after completion of formwork. The form installation procedure for filling soil cement is shown, (A) is a plan view, and (B) is a longitudinal sectional view. It is a top view which shows the form installation point for the conventional foundation construction.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Greenhouse, 2 ... Frame, 3 Solar radiation permeable covering material, 4 ... Intermediate surface material, 5 ... End surface material, 6 ... Horizontal connection material, 7 ... Composite pillar, 7A ... Outer pillar, 7B ... Inner pillar, 8 ... diagonal material, 9 ... horizontal material, 10 ... main beam, 11 ... curved beam, 12 ... stud, 13 ... foundation, 14 ... plastic mold, 15 ... lower plastic film mold, 16 ... plastic film, 17 ... Wooden support pile, 18 ... Nails, 19 ... Upper plastic film form, 20 ... Plastic film, 21 ... Wooden support pile, 22 ... Ready-mixed concrete, 23 ... Reinforcing bar

Claims (2)

At the foundation construction site, a long plastic film with a predetermined width is assembled in a ring shape so that the planar shape is circular, and the lower edge side of this ring-shaped plastic film is folded inward and installed at predetermined intervals along the circumference In the inner bent portion on the lower edge side, a support pile is provided, the ring-shaped plastic film is fixed to the support pile, and a braided bar is arranged inside, and then the ring-shaped plastic film is used as a formwork A method for constructing a concrete foundation, characterized by placing concrete. The support piles and wood, how to build a concrete foundation of a plastic film is formed by a nail fixed to the wooden support stakes claim 1 Symbol placement.

Images