JP2546103B2 - Method for forming concrete curved surface - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a concrete curved surface portion.

[0002]

In order to manufacture a concrete member having a curved surface portion, a mold having a curved surface corresponding to the curved surface portion is used. Conventionally, such a curved form has been generally formed by stacking a plurality of thin plates to form a shape, and covering the top with plywood to form a curved surface to form a form. This formwork takes time and labor, and since the number of craftsmen who can make wooden patterns is decreasing, the production cost is high.

The present invention has been made in view of the above circumstances. The purpose is to propose a method for forming a concrete curved surface portion by using a mold that does not need to make a wooden mold and can manufacture molds having various curved surface shapes at low cost.

[0004]

According to the present invention, a rod-shaped shape memory alloy mesh having a transformation point in a temperature rising range due to heat generated during hardening of injected concrete is formed into a predetermined curved surface at a temperature equal to or higher than the transformation point. After molding and memorizing the curved surface shape, a waterproof film is laminated on the back surface of the mesh body at a low temperature below the transformation point to assemble a curved surface part formwork, and concrete is poured into this formwork. Is a method for forming a curved surface portion of concrete.

A first point of the present invention is to use a mesh body of a rod-shaped shape memory alloy, which stores a predetermined curved surface shape, as a material for a curved surface section mold, and a second point thereof is a rod-shaped shape memory. The point is to use the heat of hydration at the time of hardening of the injected concrete itself as a heat source for returning the alloy mesh to the predetermined shape.

As the shape memory alloy used in the present invention, one having a transformation point at a temperature slightly higher than room temperature is selected in consideration of the fact that the heat source is only the heat of hydration of the poured concrete itself. Usually, those with a transformation point of about 40-60 ° C are used, and those with a higher transformation point in the summer,
In winter, it is preferable to use one with a lower transformation point, but when the curved part formwork is assembled and installed, the temperature of the shape memory alloy rises above the transformation point and returns to the curved surface that the shape remembers. Since there is no problem with doing so, a material with a transformation point as low as possible is selected within a range that does not hinder the assembly and installation of the curved surface formwork.

To store a predetermined curved surface shape in a shape memory alloy, a rod-shaped shape memory alloy net-like body is pressed against a reference model having a predetermined curved surface and held at a temperature equal to or higher than a transformation point for a considerable time. Can be performed more easily.

A rod-shaped shape memory alloy mesh body that memorizes a predetermined curved surface shape becomes soft when cooled to room temperature below the transformation point, so it can be freely deformed by laminating it with a waterproof film to form a curved surface part formwork. Can be easily assembled. Inject concrete into the assembled curved surface formwork. The shape memory alloy is heated above the transformation point due to the heat of hydration when hardening concrete, and the mesh body returns to the curved surface shape that it remembers while pulling the waterproof membrane, and the prescribed curved surface part is formed on the concrete surface. To be done.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a perspective view showing an example of a curved surface form. The curved shape of the reference model is stored in advance in the mesh body 1 of the rod-shaped shape memory alloy. The waterproof film 2 is laminated on the lower surface of the mesh body 1 at room temperature, and the curved surface form 3 is assembled and arranged while deforming the mesh body 1. The transformation point of shape memory alloy is 4
It is 0 to 50 ° C.

When concrete is poured into this form, the temperature of the concrete rises to 60 ° C. or higher as shown in FIG. When the temperature of the mesh body 1 rises as the temperature of the concrete rises to a temperature equal to or higher than the transformation point, the surface shape of the mesh body 1 returns to the memorized curved surface shape to form the curved surface part mold 3 having high rigidity. , A concrete surface having a curved surface of a predetermined shape is formed. When the hardening of the concrete progresses and the temperature of the mesh body 1 becomes lower than the transformation point, the curved surface part mold 3 becomes low in rigidity and returns to the original shape which is easily deformed and can be easily demolded.

[0011]

The present invention is as described above, and the curved surface part mold used in the present invention has a mesh shape of a rod-shaped shape memory alloy pressed against a reference model having a predetermined curved surface to a temperature not lower than the transformation point. Since it can be manufactured by a simple operation of maintaining at temperature, it is not necessary to make one wooden mold for each curved surface mold, just by preparing a reference model with various curved surfaces, molds with various curved shapes can be prepared. Can be mass-produced at low cost.

[0012] Then, by simply using the molds having various curved surface shapes, the heat generated when the concrete is hardened is used, and the precast concrete members having various curved surface shapes corresponding to the curved surface shapes of the molds are used. It is possible to efficiently manufacture the exterior material. It has excellent effects such as.

[Brief description of drawings]

FIG. 1 is a perspective view showing an example of a curved surface form.

FIG. 2 is a correlation graph between the elapsed time after placing concrete and the concrete temperature.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... A rod-shaped shape memory alloy mesh body, 2 ... Waterproof film, 3 ... Curved surface part formwork.

Claims (1)

(57) [Claims] 1. A rod-shaped shape memory alloy mesh having a transformation point in a temperature rising range due to heat generated during hardening of poured concrete is formed into a predetermined curved surface at a temperature equal to or higher than the transformation point, and the curved shape is memorized. After that, a waterproof film is laminated on the back surface of the mesh body at a low temperature below the transformation point to assemble a curved surface form,
A method for forming a concrete curved surface portion, which comprises injecting concrete into the formwork.