JPH0349722B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for manufacturing L-shaped concrete shapes for making concrete stairs and other arbitrary shaped concrete shapes.

<Conventional technology> The conventional method for manufacturing concrete forms is to stack a plurality of formworks on a table vibrator driven by a vibration motor, and pour fluid concrete into each formwork to fill the formworks. A common method is to compact concrete by applying vibrations.

Another method is to fix various frames inside a cylindrical form and pour fluid concrete into the form while rotating the cylindrical form.

<Problems to be Solved by the Invention> Among the conventional methods described above, the method of pouring fluid concrete into formwork on a vibration table is difficult because it is not possible to place too many formworks on the table. However, there are problems such as poor manufacturing efficiency and the fact that the concrete is compacted only by vibration, which may cause air bubbles to form and result in defective products.

In addition, concrete can be poured efficiently by fixing various frames inside a cylindrical formwork and pouring fluid concrete into the formwork while rotating the cylindrical formwork. There was a problem in that after pouring concrete and hardening the concrete, it took a considerable amount of time to disassemble the various frames inside the cylindrical formwork and take out the product.

<Means for Solving the Problems> The present invention was made to solve the above-mentioned problems.
A large number of drawer-shaped inner forms for forming a concrete form of a desired shape are removably attached to the side of the cylindrical form, and while the cylindrical form is rotated, the inside of the cylindrical form is The present invention provides a method for producing a concrete mold material, in which a desired mold material is formed by pouring fluid concrete into a mold material using centrifugal force, and then hardened by a conventional method and taken out from an inner mold material.

<Operation> The present invention is as described above, and first, a number of drawer-shaped inner forms are installed from the side of the cylindrical form to form a desired concrete form within the cylindrical form.

Then, this cylindrical form is placed on a suitable rotating device, and while the cylindrical form is rotated by this rotating device, fluid concrete is poured into the cylindrical form using centrifugal force. After forming the desired form material, it is cured. However, in the case of this invention, each inner formwork is of a pull-out type, so each inner formwork is pulled out from the cylindrical formwork together with the inner formwork before the concrete completely hardens. It can be cured in a curing room.

<Example> In FIG. 1 and FIG. 2, cylindrical formwork 2 is a large number of inner formworks mounted within the cylindrical formwork 1. In FIG.

Reference numeral 3 denotes a rotating device for the cylindrical formwork 1, which includes a pair of front and rear support stands 4 and a pair of support rollers fixed to both ends of a rotating shaft 5 rotatably supported by a bearing on each support stand 4. It consists of 6.

Then, the flanged rings 7 on the outer periphery of both ends of the cylindrical formwork 1 are placed on each support roller 6, and the cylindrical formwork 1 is rotated by rotating the rotating shaft 5 by a drive device (not shown). It is something.

As shown in FIG. 4, the inner formwork 2 is a drawer-shaped body consisting of a bottomed box-shaped main body 10 made of iron plate or the like and a front plate 11 at the front end thereof.
1 has a handle 12 attached to it.

As shown in the enlarged view of FIG. 3, inside the cylindrical formwork 1, a large number of groove-shaped receiving portions 13 formed of iron plates or the like and trapezoidal convex portions 14 between the receiving portions 13 are provided alternately. be.

Each of the inner formworks 2 is inserted into each of the receiving portions 13 from the side.

Then, appropriate connecting plates 15 are attached to both ends of each inner formwork 2.
, and tighten each coupling plate 15 with bolts 16 inserted between the left and right inner formworks 2.
Each inner formwork 2 is arranged and fixed in parallel inside the cylindrical formwork 1 by a method such as connecting the respective inner formworks 2 together.

In the case of this embodiment, the purpose is to make a stairway profile 17 having an L-shaped cross section as shown in FIG.

For this purpose, an inner mold 18 as shown in FIG. 3 is removably fixed in the main body 10. As shown in FIG.

That is, the projecting edge 19 provided on the side edge of the inner mold 18 is fixed to the main body 10 with screws 20.

This inner mold 18 is also made of an iron plate or the like.

Further, if necessary, a prefabricated reinforcing bar is inserted between the inside of the main body 10 and the outside of the inner mold 18.

The cylindrical formwork 1 with a large number of inner formworks 2 set therein as described above is placed on each roller 6 of the rotating device 3 as shown in FIGS. The cylindrical formwork 1 is driven in a fixed direction by
While rotating the concrete, fluid concrete is injected into the inside of the two groups of inner formwork.

The concrete poured as described above is poured into the inside of the main body 10 of each inner formwork 2 and the inner mold 18 as shown in FIG.
The L-shaped space between them is filled and compacted by centrifugal force.

When the concrete has hardened to some extent, all the connecting plates 15 are removed, each inner formwork 2 is pulled out from each receiving part 13, put into a curing chamber together with the inner formwork 2, cured for a predetermined time, and then taken out from the curing chamber.

Thereafter, the screws 20 are removed from the main body 10 of the formwork 2, and the stairway profile 17 made of hardened concrete as shown in FIG. 5 is taken out from the main body 10 along with the inner mold 18, and the inner mold 18 is removed.

In the molded material 17 manufactured as described above, the curved surface portion 21 that became inside during molding is on the lower side,
Stairs 23 are formed by sequentially stacking and fixing them so that the part that was in contact with the inner mold 18 becomes the tread 22 as shown in FIG.

In addition to the embodiments described above, by changing the shape of the main body 10 and changing the shape and mounting position of the inner mold 18, a product having any desired shape can be freely obtained.

<Effects> As described above, the present invention includes a drawer-shaped inner formwork for forming a concrete form of a desired shape installed inside the cylindrical formwork, and this cylindrical formwork is rotated by an appropriate rotating device. The concrete is placed on top of the mold and rotated, using centrifugal force to inject fluid concrete into the inner formwork within the cylindrical formwork, making it extremely efficient to manufacture concrete forms with complex shapes. Moreover, since the concrete is compacted by a strong centrifugal force, there is no risk of bubble generation as in the conventional compaction method using a vibration table, and a far superior product can be obtained compared to the conventional method.

In addition, since the inner formwork is a pull-out type that can be attached and removed from the side of the cylindrical formwork, the inner formwork can be easily taken out from the cylindrical formwork after molding.
Thereafter, the concrete can be cured together with the inner formwork in a curing chamber, which has the effect of facilitating post-forming processing.

[Brief explanation of drawings]

Fig. 1 is a front view showing an embodiment of a formwork for carrying out the method of this invention, Fig. 2 is a side view of the above, Fig. 3 is an enlarged sectional view showing the main parts of the above, and Fig. 4 is an inner formwork. FIG. 5 is a partially cutaway perspective view showing an example of the product, and FIG. 6 is a partially cutaway perspective view of a staircase made of the product. DESCRIPTION OF SYMBOLS 1... Cylindrical formwork, 2... Inner formwork, 3... Rotating device, 10... Main body, 17... Staircase material, 18... Inner mold.

Claims (1)

[Claims] 1 Inside the cylindrical form, a number of drawer-shaped inner forms for forming the desired concrete form are removably attached to the side of the cylindrical form, and the cylindrical form is rotated. The concrete is characterized by injecting fluid concrete into the inner formwork of a cylindrical formwork using centrifugal force to form a form material of a desired shape, and then hardening it by a conventional method and taking it out from the inner formwork. A method for manufacturing concrete shapes.