JPH0832408B2 - Method for producing plate-shaped or rod-shaped instant demolding concrete product - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for producing a concrete product of a plate-like or rod-like immediate demolding composition, for example, a lid for a road gutter, a land boundary block, a tree planting block, The present invention relates to a method for producing a concrete product capable of high-efficiency mass production by using concrete with an instant demolding composition in which a concrete flat plate, a law block, etc. are mortar finished on the upper surface.

(Prior Art) A plate-shaped or rod-shaped concrete product is prepared as shown in FIGS.
This is illustrated in the figure.

FIG. 2 is a perspective view of the road gutter 6 and shows the lid 1 which is a target of the manufacturing method of the present invention.

Fig. 3 is a land boundary block 2, Fig. 4 is a concrete flat plate 3, and Fig. 5 is each block constituting a planting pit 4, 6
The figure is the legal framework block 5.

Conventionally, such concrete products have been manufactured by pouring mixed concrete into a mold. Therefore, although it can be easily manufactured, the production amount is limited by the number of molds and the time required for demolding after pouring concrete, cleaning molds, assembling molds, and the like. That is, since the cast concrete poured into the formwork is cured together with the formwork to reveal its strength, the mold is removed and the formwork is cleaned, the formwork is assembled, and so on. It takes one day (24 hours),
The daily production can only manufacture the number of molds,
The production volume could not be increased without increasing the number of molds. On the other hand, since the cost of formwork is relatively expensive, increasing the number of formwork was not a good idea.

In addition, Machi Brook has been mass-produced by block machines using concrete with immediate demolding, but with plate-like or rod-like products such as the ones mentioned above, pressing of the bottom plate must be increased in order to prevent press work. It was also a cause of cracks.

[Problems to be solved by the invention]

It is an object of the present invention to provide a method for producing an instant demolding concrete product that can be efficiently mass-produced by a block machine with a single mold. In addition, the pressing process is carried out in a mold having high rigidity, and a manufacturing method has been developed in which the mold can be reversed and demolded and supported on the mortar face plate without using a special rigid bottom plate to cure.

[Means for solving problems]

The concrete product manufacturing method of the present invention comprises a combination of the following technical means, which will be described below with reference to FIG.

(1) A mold 10 including a bottom plate and side plates is attached to a block machine (not shown), and concrete 11 to be poured is supplied into the mold 10. In this case, in the case of reinforced concrete such as a gutter cover of a road gutter, as shown in Fig. 1 (a), approximately 11/3 of the total amount of concrete 11 is supplied flatly and spread. A reinforcing bar 12 is arranged on the upper side, and then the remaining 2/3 amount of concrete 11 is supplied into the formwork. This is subjected to vibration compaction (FIG. 1 (b)).

(2) Next, as shown in FIG. 1 (c), a press plate 13 is placed on the poured concrete, the concrete upper surface is pressed and the plate concrete is compacted to have a predetermined thickness, and the concrete upper surface is flattened. Then, the press plate 13 is removed. This state is shown in FIG. 1 (d).

(3) The surface mortar 15 is laid on the separately prepared face plate 14 and leveled, and the vibration is applied by the table vibrator 16 to level the surface mortar (FIG. 1 (e)).

(4) The face plate 14 is turned upside down and the face mortar 15 is attached to the surface of the concrete 11 shown in FIG. 4 (d).

(5) Next, while pressing the face plate 14 with the face plate retainer, as shown in FIG. 1 (g), the mold 10 is turned upside down. A table elevator (not shown) is raised to support the face plate 14 of the inverted formwork 10 on the table elevator.

(6) When the table elevator is lowered while applying vibration to the formwork 10, the immediately-released concrete 17 that has been cast is demolded from the formwork 10 and removed downward, as shown in FIG. 1 (h). As shown, it is taken out in a state of being placed on the face plate 14.

The mold 10 from which the cast concrete 17 has been removed is immediately turned upside down, and the process returns to the step (1) to manufacture the next groove lid.

On the other hand, the cast concrete 17 is steam-cured together with the face plate 14 to obtain a predetermined concrete product. The face plate 14 is reused after curing.

[Action]

The concrete product according to the present invention is a plate or rod made of concrete with immediate demolding and has a mortar surface on the upper surface, so that the upper surface has a smooth and chamfered decorative surface, and the side surface has an upper surface. Taper in the direction from the lower surface to the lower surface than the upper surface.
It is highly durable and easy to mass produce. For example, in the case of road gutters, the strength is 1.5 to 2 times that of conventional gutters with the same thickness, mortar is spread on the upper surface, and a decorative surface integrated with the main body during the manufacturing process. Therefore, the design of the groove lid is not inferior to that of the conventional casting groove lid, and mass production is possible.

Further, in the manufacturing process of the present invention, only one mold is required, and if many inexpensive face plates 14 are held, mass production can be easily performed.

〔Example〕

The concrete groove lid 1 (for special vehicle lid 240, 310 × 90 × 500, bending strength 30) shown in FIG. 2 was produced by the production process of the present invention shown in FIG. This concrete groove cover 1 has a decorative surface 2 on the upper surface of a concrete plate of immediate demolding composition, contains reinforcing bars 12, and has four chamfers 4 on the four upper surfaces.

The dimensions and specifications of this product, the composition of instant demolding concrete and the composition of mortar are as follows.

Product dimensions: 500 mm × 310 mm × 90 mm thick Reinforcing bar: 6 mm × 3 in length, 9 mm × 5 in width Appearance: Smoothed upper surface, other rough surface Combination: Unit cement amount 360 kg Unit water amount 133 kg W / C 37.0% S / A 55.0% Maximum size of coarse aggregate 10mm Unit amount of fine aggregate 1045kg Unit amount of coarse aggregate 840kg Continuous production using a block machine for producing the intelligent block produced an average production time of about 1 minute per piece . Therefore, efficient mass production is possible with one mold. This is a curing room (8m long x 2.5m wide x 3m high x 6 layers)
It was put in a box (up to 160 pieces) and cured by a standard curing cycle.

The three-point bending strength of the product is average in the conventional pouring groove lid
40.5 kg, while the average value for the groove lid by the method of the present invention
65kg and rose to 150-200%. Moreover, the surface mortar was in close contact with the immediate release concrete of the groove lid body, and no peeling was observed. In addition, good results were obtained as a result of the JIS freeze-thaw test.

〔The invention's effect〕

According to the present invention, it is possible to easily manufacture a high-strength instant demolding product, the cost is low, and mass production is possible.

[Brief description of drawings]

FIG. 1 is a process diagram of the method of the present invention, and FIGS. 2 to 6 are perspective views illustrating a plate-shaped or rod-shaped concrete product of an instant demolding composition to which the method of the present invention is applied. 1 ... Concrete groove cover, 2 ... Ground boundary block 3 ... Concrete flat plate, 4 ... Tree planting pit, 5 ... Law frame block, 10 ... Formwork 11 ... Placing concrete 12 ... Reinforcing bar, 13 ... … Press plate 14 …… face plate, 15 …… face mortar

Claims (1)

[Claims] 1. A formwork consisting of a bottom plate and side plates is mounted on a block machine, concrete with immediate demolding is supplied into the formwork, vibration compaction is carried out, and then a press plate is poured into the concrete. Place it on top and press the concrete upper surface to compact it so that the concrete has a predetermined thickness and flatten the concrete upper surface, and spread the surface mortar on the face plate prepared separately and level it by applying vibration. Reverse the front and back of the face plate and stick the surface mortar to the top surface of the concrete, then turn the formwork upside down while pressing the face plate, receive the face plate of the inverted formwork with the table elevator, and apply vibration to the formwork. Immediate demolding concrete product in the form of a plate or rod, characterized in that the immediate demolding concrete is demolded from the formwork while being added and extracted downward and steam-cured together with the face plate. Manufacturing method.