JPS5936068B2 - Formwork for concrete foundation construction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a formwork for constructing a concrete foundation for constructing a concrete foundation having an upright part and a two-chin part at one time.

Conventionally, when constructing a concrete foundation with an upright part and a two-chin part, a formwork to form the footing part is assembled, concrete is poured, and the footing part is constructed by curing for an appropriate period of time, and then the upright part is built on top of it. Either assemble the formwork to form the upright part and pour concrete to construct the upright part, or construct the formwork to form the upright part and the footing part at the same time, and pour concrete to create a concrete foundation with the upright part and the footing part. The construction method is to build all at once.

However, in the diagonal construction method, the former method requires concrete pouring twice, resulting in a long construction period, and the disadvantage is that a joint is created between the upright section and the footing section, which weakens the strength of the concrete. At the time of pouring,
The entire formwork was pushed upwards, a large amount of concrete flowed out from below the formwork, and the height of the formwork from the ground could not be adjusted, making it impossible to construct a concrete foundation of the specified shape. The drawback was that it couldn't be done.

The present invention solves the drawbacks of conventional forms for constructing concrete foundations having an upright part and a footing part, such as an inclined one, and provides a mold for constructing a concrete foundation that can construct the upright part and the footing part at a predetermined position at the same time. It provides a framework.

Hereinafter, the present invention will be explained with reference to the drawings of one embodiment.

Fig. 1 is a perspective view of an example of a formwork for constructing a concrete foundation according to the present invention, and Fig. 2 is a side view thereof.
A concrete foundation 1 having an upright portion 11 and a footing 12 as shown in the figure is constructed.

2.2' is a frame body, which includes upright parts 21, 21' and leg parts 22.
．． It has a crank shape consisting of 22' and an upright part 21.
．． 21' maintain a constant gap, and the legs 22 and 22' are arranged facing each other at appropriate intervals so as to spread out.

Flat formworks 3, 3' are installed between the upright parts 21, 21' of the adjacent frames 2, 2' to constitute parallel formworks forming the upright parts of the foundation. Along the lower ends of the frames 3, 3', parallel reinforcing bars 6, 6' are removably attached from the outside of the formwork.

For example, a through hole is provided at the lower end of the upright part of the formwork 3, 3/or the frame body 2, 2', and a wire is inserted through this hole to connect the reinforcing bars 6, 6' to the formwork 3, 3'. It is a good idea to hang it so that it sticks to the bottom edge and make it possible to remove the wire fixed to the outside of the formwork.

First tensile members 7 are installed between the first reinforcing bars 6 and 6' at appropriate intervals to prevent the spacing between the reinforcing bars 6 and 6' from widening.

Also, a gap wider than the gap between the first reinforcing bars 6, 6' is maintained on the ground inside the end portions of the legs 22, 22' in the same direction as the first reinforcing bars 6, 6'. The second reinforcing bars 8, 8' are placed side by side, and the second tension members 9 are attached to the second reinforcing bars 8, 8' at appropriate intervals to prevent spreading between the two reinforcing bars 8, 8'. 5 Steel wire meshes 4, 4' are placed between the two sets of first reinforcing bars 6, 6' and second reinforcing bars 8°8', respectively.
is installed.

These wire meshes 4, 4' form the outer periphery of the footing part 12,
It is buried together with the footing, and the frames 2, 2
' legs 22, 22'.

The reinforcing bars 6, 6' and 8.8
The side along / is fixed along these reinforcing bars.

Incidentally, there are upright portions 21.2 at both ends of the formwork in this invention.
1' and legs 22, 22', a formwork of the same shape as the foundation cross section is attached and closed at both ends.

In this way, the formwork of the present invention is formed in which the upright portion 11 and the footing portion 12 are integrally formed.

In addition, the height adjustment device 23.23 is attached to the leg portion 22.22'.
' is installed so that the height of the formwork from the ground can be adjusted.

In the above example, in order to stretch the wire mesh 4, 4' along the inner surface of the legs 22, 22' of the frames 2, 2', the reinforcing bars 6, 4' are
′ and reinforcing bars 8, 8′ are used to fix both sides of the wire mesh 4°4′, but since the wire mesh 4 has a high rigidity, by bending the wire mesh 4, the legs can be fixed in the same manner as above. If the reinforcing bars 8, 8' can be stretched along the inner surface of the section 22, the reinforcing bars 8, 8' are not necessary.

Reference numeral 5 denotes a sawing material, and reinforcing reinforcing bars not shown in the drawings are appropriately incorporated in advance in forming the formwork.

In the above-described embodiments, a crank-type frame was used, but the frame is not limited to this, and any frame having an upright portion and leg portions may be used as appropriate.

In addition, although steel wire mesh was used as the mesh material, not only various wire meshes and expanded metals, but also woven fabrics, non-woven fabrics, and other materials may be used depending on the topography of the concrete foundation construction site, the type of ground, and the accompanying pouring. It is selected and used as appropriate depending on the type of concrete.

The mesh size of the mesh varies depending on the concrete being poured and the type of aggregate used therein, but the mesh spacing is usually 1.0 m.
Anything less than m is used.

Inside the formwork structured as if it were diagonally upwards / Fresh concrete I from above
First, fresh concrete is filled in the area surrounded by the wire mesh 4, 4' and the convex formwork, and then the parallel formworks 3, 3' forming the upright part and the molds at both ends are filled. After filling fresh concrete into the compartment surrounded by the frame and curing it for an appropriate period, the frame body 2.2' and the parallel formworks 3, 3'
In addition, the formwork at both ends is removed and a concrete foundation having an upright portion 11 and a footing portion 12 is constructed at once.

The reinforcing bars and net-like materials are located and buried on the top and side surfaces of the footing portion 11 of this foundation.

The formwork for concrete IJ-G foundation construction of the present invention is constructed as described above, and one end is fixed to the reinforcing bars attached to the inside of the frame forming the leg part along the formwork forming the upright part. Since the netting is stretched, the pressure of the fresh concrete poured into this area is absorbed by the netting, and the entire formwork does not lift up, and the uprights and footings are held in place. Concrete foundations with multiple sections can be constructed at once.

Pressure is applied with a rod or a charging nozzle to eliminate voids in the fresh concrete poured into the mold, but when extra pressure is applied, the fresh concrete escapes from the formwork through the mesh of the mesh and forms a mesh. This is because it is possible for objects to deform in such a way that they bulge out.

Furthermore, by using the mesh material, excess water in the fresh concrete is drained outward, improving the quality of the concrete foundation.

In addition, the position can be adjusted simply by adjusting the height adjustment tool, and the formwork can be easily installed in a predetermined position even on soil, chestnut stone, abandoned concrete, etc. where the ground is not sufficiently leveled.

[Brief explanation of drawings]

Fig. 1 is a perspective view of an example of a form for constructing a concrete foundation according to the present invention, Fig. 2 is a side view thereof, and Fig. 3 is a side view of a concrete foundation constructed using the form for constructing a concrete foundation according to the present invention. be. Explanation of symbols 1... Concrete foundation, 2, 2')
... Frame body, 3, 3'... Parallel formwork forming the upright part, 4.4'... Wire mesh, 21, 21'... Upright part, 2
2゜22'...legs, 23,23'...height adjuster, 6゜6'...reinforcing bars.

Claims (1)

[Claims] 1 Frames having upright parts and leg parts are arranged facing each other at appropriate intervals, and a flat formwork is attached between the upright parts of the frame bodies to form parallel formworks forming the upright parts. Parallel reinforcing bars are removably attached to the outside of the formwork along the lower edge of the parallel formwork, and the reinforcing bars form the outer periphery of the footing, and one side of the mesh that is buried together with the footing is fixed. The mesh is stretched along the inner surface of the leg of the frame,
A formwork for constructing a concrete foundation, in which a height adjuster is attached to the legs of the frame body.