JPH02147203A - Centrifugal molding method of concrete product - Google Patents

Abstract

PURPOSE:To improve a production efficiency, by a method wherein after concrete is compacted down with an action of centrifugal force, the same is demolded through the inside of a concrete shuttering and then accelerated curing is performed. CONSTITUTION:After lid parts 4, 4 are fitted to both ends of a main body part A2 by arranging a pallet 5 made of steel and provided with natural building stone 6 at a fixed position within the main body part A2 of a centrifugal molding machine A, the inside of a cylindrical concrete shuttering body 3 which is turned and driven is loaded with a concrete material 8 by a concrete material loading machine. The loaded concrete material is compacted down with an action of centrifugal force due to a rotation of the main body part A2. A stairwaylike block B comprised of the natural building stone integrated with a pallet 5 made of steel and the compacted concrete material 8 is extruded on rollers 12 of a conveying stand E with a demolding machine D of a molded product. Then the main body part A2 is turned a half turn and the other side stairwaylike block B is extruded similiarly along with the pallet 5 made of the steel. The stairwaylike blocks B demolded through the centrifugal molding machine A are put in order on a product mounting stand E, conveyed to an accelerated curing chamber and steam curing is performed as mentioned above.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to concrete block products having a flat plate shape or having a flat plate shape as a main part, such as flooring materials, wall materials, stairs, etc. for construction or civil engineering. This invention relates to a centrifugal molding method.

(Prior Art) Conventionally, it is known that a concrete block product having a flat plate shape or a flat plate shape as a main part is formed using a centrifugal molding machine. The process of obtaining a product using this centrifugal molding machine involves first mixing concrete, putting the mixed concrete into the formwork of the centrifugal molding machine, and compacting the concrete by the centrifugal force generated by the rotation of the centrifugal molding machine. The concrete still in the formwork of this centrifugal forming machine is placed in a curing chamber for accelerated curing with steam, and then the concrete is removed from the formwork to obtain a concrete product.

(Problem to be solved by the invention) Conventionally, when forming a flat concrete block product using a centrifugal forming machine, a plurality of formworks are arranged in the centrifugal forming machine, concrete is poured into these, and centrifugal force Since compaction is performed by centrifugal force and the mold is removed after accelerated curing, the period in which the formwork of the centrifugal molding machine is in use spans the time required for compaction by centrifugal force and curing, making it extremely long and difficult to mass produce. It has the disadvantage of requiring a large number of formworks when
Moreover, there is a problem in that a curing room space is required for curing each formwork.

SUMMARY OF THE INVENTION An object of the present invention is to provide a manufacturing method suitable for manufacturing a flat concrete product or a concrete product having a shape close to a flat plate using a centrifugal molding machine in order to eliminate such drawbacks.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a centrifugal forming method for concrete products having a flat or nearly flat shape, in which concrete having an appropriate slump is poured into a rotating formwork. The method is characterized in that after the concrete in the form is compacted by the action of centrifugal force, it is removed from the form, and then accelerated curing is performed.

(Function) In the centrifugal forming method for concrete products of the present invention,
Since the mold is removed from the formwork of the centrifugal forming machine before curing, the molding production efficiency of concrete products per formwork of the centrifugal forming machine is extremely high.

Further, in the curing chamber, there is no need for curing together with the formwork of the centrifugal molding machine, which allows the curing chamber to be made smaller and allows for efficient curing of concrete products.

(Example) Hereinafter, a method for centrifugal molding of concrete products of the present invention will be described.

Immediate removal from concrete with 0 slump has been carried out, but immediate removal from concrete with large slump is meaningful.

In the centrifugal forming method of the present invention, concrete having a slump of about 3a++ to 10C11 can be used as the concrete material, and in addition, this concrete can be immediately demolded in the centrifugally formed state; It is placed in an accelerated curing room for curing.

FIG. 1 shows a centrifugal molding machine A used in the present invention. The centrifugal molding machine A consists of a drive section A and a centrifugally rotating main body section A2 that includes a mold.

The drive section A supports and rotates the main body section A2, so
A support wheel 2.2 is arranged to support a rotating wheel 1.degree.1 formed on the outer periphery of the main body portion A2, and one of the support wheels 2.2 is configured to be driven by a drive source such as a motor.

The main body part A2 is attached to the outer periphery of the cylindrical frame 3 having a square cross section.
Rotating wheels 1 placed on the support wheels 2, 2 are provided at the front and rear, and circular openings 4a are provided at the ends of the cylindrical frame 3 to respectively input concrete material and to regulate the amount of concrete material input. A lid portion 4 provided with a lid is provided so as to be removable.

In the centrifugal molding machine A of the present invention, two stepped blocks B, B are centrifugally formed, and as shown in FIG. A steel pallet 5.5 is placed on the steel pallet 5.5, a natural stone 6 is provided on the steel pallet 5.5, and a concrete layer is placed between the natural stone 6 and a separator 7 formed protruding from the inner surface of the cylindrical frame 3. Material 8 is filled in an L-shape, and natural stone 6
A stepped block B is obtained in which the concrete material 8 and the concrete material 8 are integrated.

In the case of a concrete product made only of concrete material, the steel pallet 5 is used to prevent damage to the surface of the concrete product and to avoid damage to the inner surface of the cylindrical frame 3 of the main body A2 when the concrete product is immediately removed from the main body A2. If natural stones are placed on the surface of a concrete material, a steel pallet is not necessarily required, since the natural stones will play the role of a steel pallet.

After placing the steel pallet 5 with natural stones 6 on it at a predetermined position in the main body A2 of the centrifugal forming machine A, and attaching the lids 4, 4 to both ends of the main body A2, as shown in FIG. Then, the concrete material 8 is charged into the inner surface of the rotatably driven cylindrical frame 3 by a concrete material charging machine C equipped with a belt conveyor 9 that can enter and exit through the circular opening 4a of one lid part 4. The poured concrete material is compacted by centrifugal force caused by the rotation of the main body A2.

Next, in order to remove the stepped block B, which is a compacted concrete material, from the cylindrical frame 3 by molding removal aD, as shown in FIG. 4, lids 4. 4 and remove the centrifugal molding machine A as shown in Fig. 5.
At one end, a carrying out table E suitable for carrying out the stepped block B placed on a steel pallet 5 is located, and at the other end of the centrifugal molding machine A, the stepped block B is placed.
The stepped block B can be extruded by a molded product demolding machine equipped with a jack 10 having the same extrusion surface as the extrusion surface. Main body A2 of molded product demolding machine and centrifugal molding machine A
As a positioning means, a fixed part 11 provided on the molded product demolding machine is engaged with the flange 1a of the rotating wheel 1,
Rollers 12 are provided on the upper surface of the carry-out table E.

On the roller 12 of tLBjlE, a stepped block B made of natural stone 6 and compacted concrete material 8 integrated with a steel pallet 5 is extruded by a molded product demolding machine, and then the main body part A! is turned half a turn, and the other stepped block B is pushed out together with the steel pallet 5.

As described above, the stepped blocks B immediately removed from the centrifugal molding machine A are sequentially placed on the product platform F, transported to the accelerated curing chamber, and subjected to steam curing.

As an example of the present invention, a step-like block having a shape similar to a flat plate has been described, but it can also be applied to flat flooring and wall materials, and instead of a composite material consisting of stone and concrete, concrete can be used. It goes without saying that the present invention can also be applied to products made only of materials.

In addition, in the embodiments of the present invention, steel pallets are used, but using steel pallets is suitable for ensuring product dimensions and preventing product deformation, especially in contact with formwork. In the case of concrete products where stones are placed on the surface, steel pallets are not necessarily required since the stones play this role. Further, as the molded product demolding machine, either a punching type or a drawing type can be used.

In the centrifugal molding method of the present invention, it is possible to repeat the charging and demolding of concrete material while the main body part equipped with a formwork is placed on the drive part of the centrifugal molding machine. This has the advantage that it is not necessary to carry out the main body portion provided with the frame to the curing room and move it from the curing room to a position for demolding.

(Effects of the Invention) The centrifugal molding method of the present invention provides the following effects.

(b) The main body of a centrifugal molding machine is equipped with a formwork, so demolding can be done before curing, rather than after curing as in the past, so there is no need to prepare many formworks, and one centrifugal The production efficiency of products using the formwork of the molding machine can be significantly increased, and there is no need to increase the formwork of the centrifugal molding machine, and the cost for this can be significantly reduced.

(b) Since the demolded product can be fed into the curing room, there is no need to bring the main body of the centrifugal molding machine into the curing room as in the past, which reduces the volume of the curing room and increases the thermal efficiency of steam curing. be able to.

(8) Since the mold can be removed before curing, hardened concrete does not adhere to the formwork of the centrifugal molding machine compared to the conventional case of demolding after curing, and the formwork of the centrifugal molding machine can be cleaned. There is no need to spend time on it.

(d) It has the advantage that the main body provided with the formwork does not need to be moved, and that no space is required for movement or work associated with the movement.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a centrifugal molding machine used in the centrifugal molding method of the present invention, Figure 2 is a cross-sectional view of the main body mold of the centrifugal molding machine of Figure 1, and Figure 3 is a centrifugal molding machine of Figure 1. A perspective view showing concrete material being fed into the molding machine. Figure 4 shows the concrete material in Figure 3 being compacted by centrifugal force and the lid removed for demolding. A perspective view, Figure 5 is a perspective view showing the concrete product being demolded from the centrifugal molding machine, and Figure 6 is a perspective view showing the demolded concrete product being placed on a molded product platform to be transported to the curing room. Perspective view. A...Centrifugal molding machine, B...Stepped block, C...
・Concrete material feeding machine, D... Molded product demolding machine, E
... Carrying out stand, 3... Cylindrical frame, 4... Lid, 5
...Steel pallet, 6...Natural stone, 8...
・Concrete material.

Claims (1)

[Claims] Concrete with an appropriate slump is poured into a rotating formwork, the concrete in the formwork is compacted by the action of centrifugal force, and then removed from the formwork, followed by accelerated curing to obtain a product. A centrifugal forming method for concrete products characterized by: