JPH04203024A - Circular forms made of plate for foundation bed - Google Patents

Abstract

PURPOSE:To facilitate assembly by a method wherein a beltlike plate is curved in a circle, the two end parts thereof are overlapped with each other, and the plates of the overlapped part are intercoupled by means of a plurality of screws inserted therethrough. CONSTITUTION:A beltlike plate 1 made of a beltlike steel sheet is curved in a circle, the two end parts of the plate 1 are overlapped with each other, and fastened for coupling by means of a plurality of screws 2 to form circular forms 4. L-metals 5 are arranged at equal angular intervals to the inner lower part of the forms 4, and a vertical plate 6 of the metal 5 is fixed to the forms 4 by means of a screw 9 to form a circular forms 10 with a mounting metal. The forms 10 are then placed to the upper part of a leveling concrete layer 12, a horizontal plate 7 of the metal 5 is fixed to the layer 12 by means of concrete nails 13, and concrete 14 is placed in the forms 4. Even when the plate 1 is thin, this constitution holds the forms 4 in the shape of roundness by means of a hoop tension, reduces the cost, and facilitates assembly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a circular formwork made of plate material for foundation plates used when constructing concrete foundation plates for civil engineering structures, large buildings, etc.

[Conventional technology]

Conventionally, as a formwork that can be used for constructing a concrete foundation, as disclosed in Japanese Patent Application Laid-Open No. 60-203769, an upper flange that projects outward and an upper part of a vertical board of an L cedar board is used. The downward protrusions are successively bent and connected, and the lower downward protrusions are bent and connected to the tip of the horizontal plate in the cedar board, and a retaining plate fixed to the vertical plate and a retaining plate fixed to the horizontal plate are connected. were connected via an angle adjustment device, and a template was fixed to the vertical plate to form a linear formwork unit, and the four formwork units were arranged and fixed to form a quadrangle. Formwork is known.

[Problem to be solved by the invention]

In the case of the conventional formwork, the structure is complicated, the manufacturing cost is high (and complicated adjustment operations are required).

The object of the present invention is to provide a circular formwork made of plate material for a foundation board, which can advantageously solve the above-mentioned problems.

[Means to solve the problem]

In order to achieve the above-mentioned object, in the circular formwork made of plate material for foundation board of the first invention, one strip-shaped plate material 1 is curved into a circle, and both ends of the strip-shaped plate material 1 are overlapped, and the polymerization is performed. The respective plate members of the section are connected by a plurality of screws 2 passed through them.

Further, in the circular formwork made of plate material for foundation board according to the second invention, a plurality of band-shaped plate materials 3 curved in an arc shape are arranged to form a circle, and the ends of adjacent band-shaped plate materials 3 are overlapped. The plates of the overlapping portion are connected by a plurality of screws 2 inserted through them.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

Figures 1 to 4 show a circular formwork with mounting brackets according to an embodiment of the first invention, in which a single frame made of a strip-shaped steel plate is shown.
A plurality of strip-shaped plates 1 are bent into a circular shape, and both ends of the strip-shaped plates 1 are overlapped, and a plurality of through holes are provided in advance in each plate at the overlapped portion, and screws 2 are inserted into the through holes. , the plates of the overlapping portion are fastened together to form a circular formwork 4.

A through-hole is provided in the vertical plate 6 of the L-carved metal fitting 5, and a through-hole 8 for needle insertion is provided in the horizontal plate 7 of the L-carved metal fitting 5. are arranged at equal angular intervals inside the lower part of the circular formwork 4, and the vertical plates 6 of the carving tool 5 are superimposed on the inner surface of the lower part of the circular formwork 4 and fixed with screws 9. A circular formwork 10 with a mounting bracket is constituted by the L-carved metal fittings 5 fixed thereto.

5 to 7 show the state in which the circular formwork 4 of the first invention is fixed in position, and a chestnut stone layer 11 is laid at the bottom of a depression in the ground. A sacrificial concrete layer 12 is placed on top of the hardened sacrificial concrete layer 12, and a circular formwork 10 with mounting fittings is placed on top of the hardened sacrificial concrete layer 12. The concrete nail 13 is inserted into the waste concrete N12 and fixed to the concrete.

Next, concrete 14 that constitutes the foundation board inside the circular formwork 4
is poured.

When concrete 14 is placed inside the circular formwork 4, hoop tension acts on the circular formwork 4 due to the pressure of the concrete 14, so even if the plate material constituting the circular formwork 4 is thin, the hoop tension Circular formwork 4
is held in a perfect circle.

8 and 9 show a circular formwork 10 with mounting brackets according to an embodiment of the second invention, in which three strip-shaped plates 3 made of strip-shaped steel plates are curved into an arc shape, and each strip-shaped plate material 3
are arranged to form a circular shape, and the ends of adjacent strip-shaped plates 3 are overlapped, and each plate in the overlapping part is tightened and connected by a plurality of screws 2 passed through them, and the two are tightened and connected. A circular formwork 4 is constituted by the three arc-shaped band-shaped plates 3, but the other configurations are the same as in the embodiment of the first invention.

When carrying out this invention, as the band-shaped plate materials 1 and 3, a band-shaped iron plate, a band-shaped aluminum plate, a band-shaped FRP plate, etc. can be used. When using a band-shaped iron plate, the L carved metal fittings 5 may be fixed by welding.

[Effects of the Invention] Since the present invention is configured as described above, it produces the following effects.

One strip-shaped plate material 1 is curved into a circular shape, and both ends are overlapped, and the overlapping parts are tightened together with a plurality of screws 2 to form a circular formwork 4, or curved into an arc shape. A plurality of strip-shaped plates 3 are arranged to form a circular shape, and overlapping portions of the ends of adjacent strip-shaped plates 3 are tightened and connected with a plurality of screws 2 to form a circular formwork 4. Therefore, the structure of the formwork for the foundation board is simple and can be manufactured at low cost, and the formwork for the foundation board can be assembled and installed easily and quickly.Furthermore, since the formwork is circular, Hoop tension acts on the circular formwork 4 due to the pressure of the concrete placed within the frame, so even if thin plate material is used as the strip plate material 1.3 that constitutes the circular formwork 4, the strength against the pressure of the concrete is insufficient. The hoop tension is large, and the circular formwork 4 can be held in a perfectly circular state.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the first invention, in which FIG. 1 is a plan view of a circular formwork with mounting brackets, FIG. 2 is a front view thereof, and FIG. 3 is a strip-shaped plate. FIG. 4 is an enlarged cross-sectional plan view showing the overlapping connection portions at both ends, and FIG. 4 is a vertical cross-sectional side view showing the mounting portion of the L-shaped fitting. Figures 5 to 7 show the state of use of the circular formwork made of plate materials for foundation plates of the first invention, and Figure 5 shows the circular formwork installed on waste concrete and concrete poured into it. FIG. 6 is a partially longitudinal side view showing the state in which the mold has been cast, FIG. 6 is a longitudinal side view showing the state in which the circular formwork is fixed to the concrete, and FIG. 7H is a front view thereof. FIG. 8 is a plan view of a circular formwork with mounting fittings according to an embodiment of the second invention, and FIG. 9 is a front view thereof. In the figure, 1 is a strip-shaped plate material, 2 is a screw, 3 is a strip-shaped plate material,
4 is a circular formwork, 5 is an L-shaped metal fitting, 8 is a through hole for needle insertion, 9 is a screw, 10 is a circular formwork with mounting hardware, 12 is a waste concrete layer, 13 is a concrete nail, and 14 is concrete.

Claims (2)

[Claims] (1) A foundation in which one strip-shaped board 1 is curved into a circular shape, and both ends of the strip-shaped board 1 are overlapped, and each board in the overlapped part is connected by a plurality of screws 2 inserted across them. Circular formwork made of board material. (2) A plurality of strip-shaped plates 3 curved in an arc shape are arranged to form a circle, and adjacent strip-shaped plates 3
A circular formwork made of plate materials for a foundation board, in which the ends of the plates are overlapped, and each plate material in the overlapped part is connected by a plurality of screws 2 passed through them.