JP2001018209A - Manufacture of concrete product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely remove air in concrete by releasing the air in the concrete into a vacuum space without requiring a high-powered vibrator by placing concrete into a form in a vacuum state. SOLUTION: A form 1 is set in a placing room 3 in a vacuum state or the form 1 is brought into a vacuum state by shutting off air. Concrete C is cast while penetration of the air is intercepted, and the concrete C is placed in the form 1 by allowing the concrete to freely drop. By surely removing air by releasing air in the concrete into a vacuum space without requiring a vibrator thereby, even for the concrete from which exclusion of an air bubble is difficult by the conventional arts, concrete of a more higher density can be placed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a precast concrete product, such as a concrete panel, formed by a mold.

[0002]

2. Description of the Related Art In general, when concrete is poured into a formwork, vibrations are given to the concrete using a vibrator or the like, so that air mixed in as bubbles in the concrete is expelled to the outside air and the concrete is compacted. Is making.

[0003]

The problem to be solved is that, depending on the device for applying vibration to concrete, a large noise or vibration is generated, so that the working environment of the casting worker is deteriorated and the device is resistant to vibration. Due to the necessity of using a formwork, the cost of manufacturing the formwork is high, and depending on the mix and type of concrete, the air in the concrete may not be sufficiently removed with a vibrator, and particularly highly viscous highly fluidized concrete and resin concrete And the like, and furthermore, it is difficult to expel air bubbles inside a mold with a lid.

[0004]

According to the present invention, in order to solve the above-mentioned conventional problems, the mold is placed in a casting chamber in a vacuum state, or the mold is placed in a vacuum state in which the atmosphere is shut off, and the atmosphere is cut off. By sending concrete while blocking the entry and dropping concrete into the formwork while freely falling in the vacuum space, the air in the concrete can be reliably released and removed into the vacuum space without the need for a vibrator, and the conventional bubble The most important feature is that concrete can be cast with higher density even if concrete has been difficult to remove.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION A mold is placed in a casting chamber in which a vacuum is drawn by vacuuming the air inside through a vacuum suction pipe, and concrete is poured into the mold by a concrete charging pipe which is shielded from the atmosphere. Alternatively, a concrete charging pipe and a vacuum suction pipe are connected to the upper part of the mold with the mold closed, and concrete is poured by a charging pipe that is cut off from the atmosphere while vacuum-sucking from the vacuum suction pipe.

[0006]

FIG. 1 shows a first embodiment of the present invention, in which a mold 1 of various concrete products is vacuum-evacuated by vacuum suction of the air inside thereof through a vacuum suction pipe 2 by a vacuum pump. The mold 1 is placed in the casting chamber 3 in which a complete vacuum and a quasi-vacuum state close to a thin vacuum of air are included.
It is configured such that concrete C is poured into the inside thereof by a concrete charging pipe 4 which shields the atmosphere.

The form 1 has a different shape and structure depending on the concrete product to be shaped. For example, as shown in the figure, the cover 1 'is detachably attached to the form body so as to be removable. Doing is the same as a general formwork.

The casting chamber 3 is provided with a form transfer path 5 for transferring the form 1 such as a roller conveyor or a rail (a form with wheels or a carriage on which the form is mounted) in series inside and outside thereof. In addition, the front and rear walls are provided with entrances and exits 6 and 7 through which the form transfer path 5 passes, and the entrances and exits 6 and 7 are provided with opening and closing gates 8 and 9 capable of sealing the interior of the casting chamber 3 in an airtight manner. .

The charging pipe 4 is connected to the lower end of a hopper 11 with a shut-off valve 10 for sequentially charging the concrete 4 so that its tip penetrates into the interior from the upper wall of the casting chamber 3, and a certain amount of concrete is charged and shut off. The casting chamber 3 is shut off from the outside air by intermittently charging the valve 10 by closing it, opening it again, and feeding it again.

In this case, the charging pipe 4 may be connected to a pumping pipe from a concrete pumping pump.

A plurality of injection pipes 4 can be installed, a plurality of molds 1 can be simultaneously carried into the casting chamber 3, and a plurality of vacuum casting operations can be performed simultaneously.

FIG. 2 shows a second embodiment of the present invention. The mold 1 which can be removed from the mold 1 by detachably attaching a lid 1 'is sealed, and a concrete charging pipe 12 is provided on the upper part thereof. And a vacuum suction pipe 13 connected thereto, and while the air in the mold is vacuum-evacuated from the vacuum suction pipe 13, the concrete C is poured by the charging pipe 12 in a state where the atmosphere is shut off as in the first embodiment. It is like that.

In the first and second embodiments, a simple vibrator for applying light vibration to the form may be mounted to compact the concrete poured into the form.

[0014]

As described above, according to the present invention, concrete is poured into the formwork in a vacuum state, so that the air in the concrete can be reliably discharged and removed into the vacuum space without using a powerful vibrator. It becomes possible to cast concrete with a higher degree of density even in concrete where it has been difficult to expel air bubbles in the past.

When the mold is placed in a casting chamber in a vacuum state, it is not necessary to apply vacuum equipment to the mold itself, so that the manufacturing cost of the mold can be reduced, and the mold is sequentially and intermittently placed in the casting chamber. One or a plurality of molds can be fed in to continuously form a concrete product in a flow operation.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a first embodiment of the present invention.

FIG. 2 is a vertical sectional side view showing a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Formwork 1 'lid 2 Vacuum suction pipe 3 Casting room 4 Input pipe 5 Formwork transfer path 6 Doorway 7 Doorway 8 Opening / closing gate 9 Opening / closing gate 10 Shutoff valve 11 Hopper 12 Input pipe 13 Vacuum suction pipe C Concrete

Claims (2)

[Claims] 1. A mold is placed in a casting chamber which has been evacuated by vacuum suction of air inside the vacuum pump through a vacuum suction pipe, and a concrete injection pipe in which air is shut off in the mold. A method for producing a concrete product, comprising placing concrete by means of casting. 2. A concrete form is hermetically sealed, a concrete charging pipe and a vacuum suction pipe are connected to the upper part thereof, and concrete is poured by a charging pipe which cuts off the atmosphere while sucking vacuum from the vacuum suction pipe. To manufacture concrete products.