JPS6132710A - Centrifugal molding device for stair block - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is an apparatus for forming concrete stair blocks using centrifugal force.

2. Description of the Related Art Conventionally, it has been known to form stairs by stacking concrete stair blocks having a cross-sectional shape as shown in FIG. 4 as shown in FIG. Stair blocks of this shape cannot be formed using centrifugal force, but in order to uniformly fill the material, it is difficult to place the formwork inside the rotating cylinder, and it is usually necessary to pour the material and apply vibration. Created by pressure. In particular, centrifugal molding is difficult when the length of the stepping portion is twice or more than the length of the rising portion.

Problems to be Solved by the Invention The above-mentioned stair block can be molded using centrifugal force, and a homogeneous and high-strength product can be obtained.

Means for Solving the Spill μ Point The present invention provides a formwork for forming a stair block having an L-shaped rising part and a stepping part, and having thicker bottom corner parts, on the inner circumferential wall of a rotating cylinder. A plurality of molds are arranged in parallel in the axial direction with the rising part side facing the wall surface, and each mold is arranged at an angle to the radiation surface on the opposite side of the rotation direction of the rotary cylinder. This is a centrifugal molding device for stair blocks.

The stair block manufactured by the present invention is preferably formed into a cross-sectional shape as shown in FIG. 3 to facilitate centrifugal force forming. That is, the relationship between the dimension a of the rising portion 1 and the dimension of the footstep portion 2 may be the same as that of the conventional stair block, but it is particularly effective when b≧2a. and bottom corner 3
It has an arcuate surface in parentheses () to make it thicker. This arcuate surface may be straight, 1 and the angle of each formwork to the radial surface is 10 to 15, depending on the size of the block.
The most preferred range is 12°.

Embodiment FIG. 1 is a partially cutaway front view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing the internal structure of the same.

In the figure, reference numeral 4 denotes a rotary cylinder, and formworks 5 are arranged parallel to each other in the axial direction on the inner circumferential wall. The formwork 5 has a rising part 1 forming part 6 and a stepping part 2 forming part 7 of the stair block in an L-shape, and the corners thereof are formed into arc-shaped parts 8. Each formwork is arranged at an angle α on the side opposite to the direction of rotation of the rotary cylinder 4 with respect to the radiation surface A. In the case of this example α-12
° It is.

Effects of the Invention When the molding device of the present invention is charged with concrete material while rotating at high speed, the concrete material is compressed by centrifugal force.
Enter inside each formwork 5. Although the formwork 5 has an arcuate portion 8 formed therein, the formwork itself is installed at an angle α on the opposite side of the rotating direction of the rotary cylinder 4, so that the concrete material is formed in the rising portion 1. It flows smoothly into the molding part 6 and is densely filled. That is, the present invention makes it possible to easily 'Am' a stair block, which has conventionally been difficult to efficiently manufacture by centrifugal molding, due to the synergistic effect between the shape of the stair block and the configuration of the centrifugal molding form. In addition, the manufactured stair blocks are solid, strong, and have a beautiful finish, and have high commercial value.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the present invention - a partially cutaway front view, Fig. 2 is a perspective view showing the internal structure of the same, Fig. 3 is a sectional view of a stair block obtained by the present invention, FIG. 4 is a sectional view of a conventional stair block, and FIG. 5 is an assembled sectional view of the same. 1... Rising part 2... Foot stepping part 3... Corner part 4... Rotating body

Claims (3)

[Claims] (1) It has an L-shaped rising part and a stepping part,
A plurality of formworks for forming stair blocks with thick bottom corners are arranged in parallel in the axial direction on the inner circumferential wall of the rotary cylinder, with the rising part side facing the wall surface, and each formwork has a radial surface. A centrifugal forming apparatus for a stair block, characterized in that the rotary cylinder is arranged at an angle on the opposite side of the rotational direction of the rotary cylinder. (2) A centrifugal forming apparatus for a stair block according to claim (1), wherein the thick portion uses a formwork having an arc shape. (3) The centrifugal forming apparatus for stair blocks according to claim (1), wherein the length of the stepping portion is at least twice the length of the rising portion.