JPS6315885B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a concrete formwork having a flexible part, and a formwork which has a bendable part on the concrete molding surface but does not cause streaks on the surface of the concrete product corresponding to the bending part. The purpose is to provide.
Formwork here includes templates for on-site assembly.

For example, in forming forms for mass production of rectangular cylindrical concrete products such as boxes and culverts, the gap between the outer and inner molds is filled with concrete.
When demolding a product, the outer mold opens outward and the inner mold collapses inward to remove the product. For this reason, a part of the inner mold is cut off, and when demolding, it is pulled inward and the adjacent parts are brought together to narrow three sides inward, or one side is bent inward into a trough shape. The method used is to move the two adjacent surfaces inward.

In either method, the inner mold is divided into several parts,
When filling concrete, the divided parts are brought into close contact with each other, and when demolding, the divided parts are opened and operated for demolding. Because concrete with good fluidity is poured,
Concrete also invaded the joints of the parts that were supposed to be in close contact, and this solidified as it cured. This process is repeated to mass produce the product, so it sticks to the seams,
Accumulating concrete cleaning was hindering the efficiency of formwork assembly work. In addition, seam lines were always produced on the surface of the product, and the work to remove them was often required.

The present inventor abandoned the conventional idea of separating the molding surfaces and making them completely adhere to each other during mold assembly.
The idea was to make the molding surface itself bendable.
Then, a flexible plate made of rubber or the like is constructed at the position where bending is required on the molding surface, this flexible plate is backed by a bendable reinforcing plate, and this is fixed to a steel plate on the adjacent molding surface to support it. I let him do it.

Next, the configuration and embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a plan view of a forming form for mass production of prismatic cylindrical concrete products to which the present invention is applied, and FIG. 2 is a longitudinal sectional view thereof. The side plate 1a of the outer mold does not move during demolding,
The side plates 1b and 1c open outward as shown by the chain lines, and the side plate 1
d moves outward in parallel with the open side plates 1b and 1c attached, but this is not particularly different from the conventional method.

In this case, the features of this invention appear in the inner mold. That is, a part of the forming surface mainly composed of steel plates is made of a flexible plate 3 (Figs. 1 and 3) connected to adjacent steel plates 2b and 2c without any difference in level, and the flexible plate 3 has its longitudinal direction as an axis. A bendable reinforcing plate (hinge 4) is fixed to the non-molded surface side as a backing.
Both edges of the reinforcing plate (hinge 4) are adjacent to both steel plates 2
It is a concrete formwork having a flexible part that is fixed directly or in open contact to the non-forming surfaces of b and 2c.

Among the four side plates 2a, 2b, 2c, and 2d of the inner mold, part of the molding surface of the side plates 2b and 2c is a flexible plate, in this example, a rubber plate 3. Since the refraction axis B is located at the center of each of the side plates 2b and 2c, the steel plate is divided into left and right parts, and the rubber plate 3 is inserted in the center. Of course, on the forming surface that contacts the concrete, the steel plate part and the rubber plate part are connected smoothly, and since the rubber plate 3 is thicker, it protrudes to the back side accordingly.

3 and 4 show enlarged cross sections, the wing plate 4a of the hinge 4 fixed to the outer surface of the rubber plate 3 with screws 5 (or fixed with adhesive) is the entire length of the rubber plate 3, that is, the inner mold side plate 2b
Since it is a belt-shaped steel plate whose height is equal to the total length of the steel plate, it is also backed by a reinforcing channel steel 4b. A bracket is attached to each of the channel steels 4b on both sides, and a shaft 4c is passed through them to form a hinge. The wing plate 4a and the side plate 2b, which is an adjacent steel plate, are indirectly fixed by welding via an intervention plate 6 that fills the difference in level between the rubber plate 3 and the side plate 2b.
FIG. 4 shows a state in which the side plate 2b including the rubber plate 3 is slightly bent. The rubber plate 3 is the left and right wing plate 4a of the hinge 4,
Since both sides of the refraction axis B are lined from 4a, there is no risk of irregular deformation such as twisting or damage caused by the refraction action. In other words, even if the weak rubber plate 3 is added, the strength of the side plate is not impaired, and the surface of the bent portion is always smooth, so there is no risk of leaving streaks on the product surface.

Next, a simple handling explanation of the embodiment shown in FIGS. 1 and 2 will be given. As shown by solid lines in FIG. 1, concrete is poured from above into the gaps between the assembled outer mold side plates 1a to 1d and inner mold side plates 2a to 2d, and curing is the same as in the past. During demolding, the outer mold is opened by rotating the side plates 1b and 1c as before, and the side plate 1d is moved in parallel to open the three outer surfaces of the formed concrete, but the inner mold is opened by rotating the side plates 1b and 1c.
In order to bend b and 2c inward, a threaded rod 7 passed through the center of the formwork is turned with a handle 8, and female threads 9 and 9 with left and right links 10 attached are moved. As a result, each hinge shaft 4c is simultaneously pulled inward via the link 10, and the side plates 2b, 2c are pulled inward as shown by the chain lines in FIG.
refract inward. Note that when the side plates 2b and 2c are bent at their respective centers, the corner portions 11 at both ends of the side plates 2a and 2d, which are connected as a single plate, are slightly bent.
The entire inner mold can now be extracted upwards using a crane. Then molded concrete products as well.
Take it out using a crane. Alternatively, the inner mold may be left as it is, and the product may be immediately carried out by holding the product at a position away from the inner mold side plates 2b, 2c.

The present invention has been explained above using an example in which it is applied to a forming form for prismatic cylindrical concrete products, but this invention has been developed by changing the molding surface of various concrete forms and templates, which have always been rigid. , a part of which is a flexible surface reinforced to be bendable, and can be varied and applied in a variety of ways depending on the implementation conditions without changing its gist. For example, FIGS. 5 to 7 show three embodiments in which the backing reinforcing plate 4 of the flexible plate 3 is not a hinge. In FIG. 5, the molding surface between the adjacent steel plates 11 and 11 is made of a flexible plate 3 made of rubber, and the reinforcing plate 4' that backs it is also an integral rubber plate, and both edges of the molding surface are formed between the adjacent steel plates 11 and 11.
This is an example in which it was glued to 11. The reinforcing plate 4'' in FIG. 6 is a flexible metal thin plate, to which the rubber plate 3 is glued, and both edges are glued to adjacent steel plates 11, 11. In FIG. 7, the same as in FIG. A thick rubber plate serves as both the flexible plate 3 and the reinforcing plate 4', and this is an example in which its refraction axes are arranged in parallel at several locations.In addition, the flexible plate 3
be made of a material other than rubber, or the reinforcing plates 4, 4',
The design can be made according to the implementation conditions, such as by variously changing the combination with 4''.

Including the above-mentioned embodiments, the formwork in which the molding surface was divided because the shape of the molding surface was not suitable for demolding is simplified by this invention, and it is possible to produce a wide variety of products in small quantities in which only a part of the product or the bending angle changes. With this invention, the formwork for the product can be designed to be used for multiple purposes, and the steel template for on-site assembly can also be bent at any angle and used.

This invention changes part of the molding surface of the steel plate formwork into a flexible surface without any steps, supports the flexible surface from the back with a hinge mechanism, and fixes the hinge wing plate to the adjacent steel plate. Even if a weak flexible plate was used, the strength as a concrete form forming surface could be secured.

This invention makes it possible to provide a flexible bent portion on the molding surface of a formwork, which has heretofore always been considered rigid, which adds considerable convenience to the design and construction of concrete molding forms.

[Brief explanation of the drawing]

1 and 2 are a plan view and a vertical sectional view of an example of a molding frame to which the present invention is applied, FIG. 3 is an enlarged sectional view of a bending portion of the molding surface, FIG. 6 and 7 are sectional views of essential parts of three other embodiments of the present invention. 3... Flexible (rubber) plate, 4, 4'... Reinforcement plate.

Claims (1)

[Claims] 1 A part of the forming surface of the formwork, which is mainly composed of steel plates, is made of a flexible plate that is connected to an adjacent steel plate without any difference in level, and the flexible plate is non-conforming with a reinforcing plate that can be bent around its longitudinal direction as a backing. 1. A concrete formwork having a flexible portion, which is fixed to a forming surface side, and both edges of the reinforcing plate are directly or indirectly fixed to both adjacent steel plates non-forming surface sides.