JPH05185407A - Method and device for forming concrete - Google Patents

Abstract

PURPOSE:To provide a forming method of concrete, in which a proper weight is applied while transmitting vibrations so that compaction is equalized, compaction is conducted under a free state and concrete having the low percentage of voids can be obtained. CONSTITUTION:An abutting body 5 is abutted against the top face of a concrete material 2 in a form body 3 for forming and the form body 3 for forming is vibrated in a forming method of concrete, the weight of a member 6 for balancing the abutting body slightly lighter than that of the abutting body 5 in the direction that the abutting body 5 is lifted, and the abutting body 5 is followed up to the sinking of the top face of the concrete material 2 generated in a concrete forming process, thus eliminating the effect of compression by the weight of the abutting body 5, then compacting concrete.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete molding method and a concrete molding apparatus, and in particular,
The present invention relates to a concrete molding method and a concrete molding apparatus that perform compaction.

[0002]

2. Description of the Related Art Conventionally, as a concrete molding method for performing compaction by vibration, a concrete material is mechanically compressed from the upper side through a pressure plate to vibrate the concrete material. There is a method of molding.

[0003]

However, according to this method, in the concrete molding process, the concrete
In order to mechanically compress the concrete material from the upper side, the vibration of the concrete is actually reduced, and the aggregate (sand, gravel, etc.) in the concrete near the pressure plate is frictionally attracted. However, there is a problem in that the concrete cannot be submerged, a portion having a very high porosity is formed under the arch, and the portion easily separates.

On the contrary, when the pressure plate is eliminated and vibration is applied in a weightless state, there is a problem that the upper portion cannot be compacted.

According to the present invention, in the concrete molding process, appropriate weight is applied while transmitting vibration so that compaction is evenly distributed, and compaction is performed in a free state to achieve compaction with a low porosity. An object of the present invention is to provide a concrete molding method and a concrete molding apparatus capable of obtaining a sheet.

[0006]

In order to achieve the above-mentioned object, the concrete molding method of the present invention comprises the step of bringing the contacting body into contact with the upper surface of the concrete material in the molding frame. A concrete molding method for vibrating a molding frame,
The weight of the contact body balancing member, which is slightly lighter than the weight of the contact body, acts on the contact body in a direction of lifting the contact body, so that the contact body is caused to sink in the upper surface of the concrete material during the concrete molding process. Is followed, and the influence of the compression due to the weight of the contact body is eliminated to compact the concrete.

Further, in the concrete molding apparatus of the present invention, a molding frame for accommodating a concrete material, a vibrating section for vibrating the molding frame, and the molding frame are provided. An abutting body that comes into contact with the upper surface of the concrete material and a contacting body balancing member that applies a slightly lighter weight than the weight of the abutting body in a direction of lifting the abutting body are provided.

[0008]

In the concrete molding apparatus of the present invention, when the abutting body is brought into contact with the upper surface of the concrete material in the molding frame to vibrate the molding frame, the molding frame is formed. The weight of the abutment body that abuts the upper surface of the concrete material in the body is
The contact body balancing member acts on the upper surface of the concrete material with a reduction, and the vibration causes the aggregate (sand, gravel, etc.) grains in the concrete material in the molding frame body to come close to each other.

As a result, the upper surface of the concrete material sinks, but since the abutment body is heavier than the abutment body balancing member,
Following the sinking of the upper surface of the concrete material, the abutment body continues to vibrate in contact with the upper surface of the concrete material.

Further, when the effect of vibration is enhanced, the concrete
Cement paste on the surface of aggregate (sand, gravel, etc.) grains
The strike is fluid, and gradually the entire concrete becomes fluid and the concrete is compacted.

[0011]

[Examples] As a good filling method for concrete materials, make a state in which air mixed in by concrete is sufficiently discharged until it is compacted. In order to prevent the separation of concrete material, the compaction should be evenly distributed.

The concrete used in this embodiment has a small ratio of water to cement. For example, the conventional concrete has a high water-cement ratio of about 55%, whereas the concrete used in this embodiment has a high water-cement ratio. The concrete used in the example has a ratio of water to cement of about 40% or less and is hard.

As a result of experiments, the present inventor found that in the concrete molding process, the concrete material was
In the above-mentioned conventional method in which the concrete material is mechanically compressed through the pressure plate and the concrete material is vibrated to be formed, the vibration of the concrete is reduced to reduce the aggregate (sand) in the concrete near the pressure plate. , Gravel, etc.) form an arch by friction, making it impossible to sink concrete, and a portion with a very high porosity is formed under the arch, and separation is likely to occur at that portion. On the contrary, when vibration was applied with no load, the upper part could not be compacted.

As a result, the present inventor has found that in the vibration pressure concrete molding method in which vibration is applied to perform compaction (hereinafter referred to as "vibration pressure concrete"), the entire molding process is performed during the concrete molding process. In order to carry out uniform compaction, it is not necessary to compress, and to ensure that the compaction is evenly distributed, a proper weight is applied while transmitting vibration completely, and compaction is performed under free conditions. It was found that hardening is a necessary condition, and good experimental results were obtained.

The term "appropriate weighting" as used herein means that, ideally, the abutting body that abuts on the upper surface of the concrete material does not have a weight but only a mass. , Actually, when compacted, aggregate (sand, gravel, etc.) grains in the concrete material come close to each other, and the upper surface of the concrete material sinks, so that the contact body (mass) As a means for following the sinking of the top surface of the concrete material, a suitable weight is placed on the top surface of the concrete material.

Further, in the method of molding the vibration pressure concrete, in order to reduce the transmission of vibration from the molding frame side to the contact body balancing member side, the vibration pressure concrete is contacted with the upper surface of the concrete material. An elastic body is provided so that the contact body is affected by the gravitational acceleration and the upper surface of the concrete material reduces the influence.

That is, when the molding frame moves downward,
The abutting body that is going to move downward resists the force of the elastic body, so that the force of gravitational acceleration is reduced, and the abutting body becomes concrete.
When the molding frame moves upward, the force of gravitational acceleration is partially absorbed by the elastic body, and the force of gravitational acceleration is reduced. Abut on the upper surface of the grate material.

As a result, the upper surface of the concrete material sinks, but since the abutment body is slightly heavier than the abutment body balancing member, the abutment body follows the depression of the upper surface of the concrete material, and the abutment body moves. Vibration is continued while abutting on the upper surface of the concrete material.

Further, when the effect of vibration is enhanced, the concrete
Cement paste on the surface of aggregate (sand, gravel, etc.) grains
The strike is fluid, and gradually the entire concrete becomes fluid and the concrete is compacted.

(In a stable state in which the concrete is compacted by vibration and the subsidence of the upper surface of the concrete material is eliminated, conversely, when vibrating, a load is applied from the upper surface of the concrete material. Alternatively, the pressure may be propagated in all directions of the concrete material so that the concrete material is more closely adhered to form the concrete.) Vibration is performed for a predetermined time, and then the vibration is stopped, Remove the concrete from the molding frame.

FIG. 1 is a diagram schematically showing a concrete molding apparatus 1 of an embodiment of the concrete molding method described above.

The concrete molding apparatus 1 is generally provided with aggregates (sand, gravel, etc.) supplied by a supply pipe (not shown), Portland cement, water (the ratio of water to cement is about 40% or less). , Etc., and a vibrating section 4 for vibrating the molding frame 3 vertically, for example, and a concrete in the molding frame 3 The contact member 5 contacts the upper surface of the torch material 2.

A contact body balancing member 6 [for example, the mass of the contact body 5 is m is applied to the contact body 5 in the direction of lifting the contact body 5 so as to apply a slightly lighter weight than the weight of the contact body 5]. (10
kg), the mass of the contact body balancing member 6 is m−Δ
m (9.7 kg). In this way, a slight difference (0.3 kg) is provided between the mass of the contact body 5 and the mass of the contact body balancing member 6 in consideration of mechanical loss such as a pulley and the like. With the sinking of the upper surface, the contact body 5 follows the contact with the upper surface of the concrete material 2, and the contact body 5 is kept in contact with the upper surface of the concrete material 2 to continue vibration. This is because. ], The contact body balancing member 6 and the contact body 5
Are connected to each other via the elastic member 7 by, for example, a wire-8.

Reference numeral 9 is a dashpot, and 10 is an elastic member. The dashpot 9 and the elastic member 10 reduce vibrations from the vibrating section 4 transmitted to the floor 11.

(In a stable state where the concrete is compacted by vibration and the sinking of the upper surface of the concrete material 2 is eliminated, conversely, a weight is applied from the upper surface of the concrete material 2. , The contact body balancing member 6 is lifted, and the contact body 5 is placed on the upper surface of the concrete material 2.
Under the condition that the weight of the contact member 5 acts or the contact member 5 is positively applied with an external force,
It is also possible to propagate the pressure in all directions of the cover material 2 to bring the concrete material 2 into closer contact with each other to form the concrete. Although the elastic member 7 is provided in this embodiment, the present invention is not limited to this, and the concrete molding apparatus 1 shown in FIG. 1 in which the elastic member 7 is omitted may be used.

[0026]

The concrete molding method of the present invention is a concrete molding method in which a contact body is brought into contact with the upper surface of the concrete material in the molding frame body to vibrate the molding frame body. The weight of the contact body balancing member, which is slightly lighter than the weight of the contact body, acts in the direction in which the contact body is lifted to cause the upper surface sink of the concrete material generated in the concrete molding process. Since the concrete is compacted by following the abutment body and eliminating the influence of compression due to the weight of the abutment body, the vibration is transmitted while the compaction is evenly distributed. It can be compacted under free conditions by applying an appropriate weight, and a concrete having a low porosity can be obtained.

Further, in the concrete molding apparatus of the present invention, the molding frame for accommodating the concrete material, the vibrating section for vibrating the molding frame, and the inside of the molding frame. Since the abutting body that comes into contact with the upper surface of the concrete material and the abutting body balancing member that applies a slightly lighter weight than the weight of the abutting body in the direction of lifting the abutting body are provided. By applying an appropriate weight while transmitting vibration so that the compaction is uniformly distributed, compaction can be performed in a free state, and a concrete having a low porosity can be obtained.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a concrete molding apparatus of an embodiment of the concrete molding method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete molding device 2 Concrete material 3 Forming body 4 for molding 4 Vibrating part 5 Contact body 6 Contact member balancing member 7 Elastic member

Claims (2)

[Claims] 1. A concrete molding method in which a contact body is brought into contact with an upper surface of a concrete material in a molding frame body to vibrate the molding frame body, and the contact body is lifted. The weight of the abutment body balancing member, which is slightly lighter than the weight of the abutment body, is applied in the direction to cause the abutment body to follow the depression of the upper surface of the concrete material generated in the concrete molding process. A concrete characterized by compacting the concrete by eliminating the influence of compression due to the weight of the contact body.
Molding method. 2. A molding frame for accommodating a concrete material, a vibrating portion for vibrating the molding frame, and an abutting member for contacting an upper surface of the concrete material in the molding frame. A concrete molding apparatus comprising: a contact body; and a contact body balancing member that exerts a weight slightly lower than the weight of the contact body in a direction of lifting the contact body.