JPH0821094A - Bar vibrator and vibration deforming method using it - Google Patents

Abstract

PURPOSE:To reduce the rough bubbles in the inner part and surface of a panel and provide uniform bubbles over a wide range by inserting a bar vibrator having a plurality of vibrating arms protruded from the outer circumference of a bar vibrating shaft into the mortar in a form to promote the defoaming of the rough bubbles present in the vibration transmitting range by the vibration generated from the top end. CONSTITUTION:A bar vibrator 2 has a vibrating arm 3 on one end of a bar vibrating shaft 2a, and an exciter 8 for giving a vibration vertically to the vibrating arm 3 which is built in the same end. It is inserted into a form 1 to which mortar 5 is injected. Then, the vibration generated from the top end of the vibrating arm 3 is transmitted to the mortar 5 to promote the movement of the rough bubbles present in the vibration transmitting range. The mortar 5 is gradually deformed to the upper part. Thus, the rough bubbles are eliminated to facilitate the waterproofing work or coating of a panel surface, and a concrete having preferable appearance and strength can be manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for defoaming bubbles in a mortar using a rod-shaped vibrator, and more particularly to a method for defoaming bubbles from a mortar for lightweight cellular concrete (hereinafter abbreviated as ALC).

[0002]

2. Description of the Related Art In order to produce ALC, a siliceous raw material, a calcareous raw material and other binders and water are stirred by a mixer, and the mixed raw material mortar is poured into a mold having reinforcing bars and foamed. It was However, air bubbles are mixed in the step of stirring with a mixer and the step of injecting into the mold from the mixer, and this air bubble is brought into the mold as it is and hardens to form coarse bubbles on the surface and inside of the product. When cutting with a piano wire, it was one factor that deteriorates the appearance and workability of the cut surface. In order to remove such coarse air bubbles, there is an abacus ball on a rod-shaped vibrator used in concrete pouring such as Japanese Patent Publication No. 1-10322 or a vibration transmission shaft such as Japanese Patent Laid-Open No. 60-214906. It is known to have attached.

[0003]

However, the former rod-shaped vibrator has a large decapsulation effect in the vicinity of or in contact with the vibrating body of the rod-shaped vibrator, but has a drawback that the effect sharply decreases as the distance increases. In the latter case where the abacus ball is attached to the vibration transmission shaft, the defoaming effect of the coarse bubbles in the vicinity thereof is sufficient, but there is a problem that it takes a long time to completely remove the bubbles.

Therefore, the present invention has been made in view of the above circumstances, and an object thereof is to propose a vibration removal method with high uniformity, which efficiently removes coarse air bubbles mixed in a raw material mortar of an ALC material. That is.

[0005]

That is, the present invention is a bar-shaped vibrator in which a plurality of vibrating arms are projected from the outer periphery of a bar-shaped vibration shaft in a bar-shaped vibrator, and the bar-shaped vibrator is inserted into a mortar in a mold. The method is a vibration defoaming method for mortar, characterized by defoaming.

[0006]

According to the present invention, a plurality of vibrating arms project from the outer circumference of the vibrating shaft of the bar-shaped vibrator, so that the vibration generated from the vibrating arm tip promotes defoaming of coarse bubbles in the vibration transmitting range. It is possible to reduce coarse air bubbles inside and on the surface of the panel to make air bubbles uniform over a wide range.

[0007]

The present invention will be described in more detail with reference to the following examples. FIG. 1 is a view showing a state in which the rod-shaped vibrator 2 of the present invention is inserted between the reinforcing bars 4 arranged in the mold 1. By inserting the rod-shaped vibrator 2 between the reinforcing bars 4, it is possible to remove bubbles that tend to collect around the reinforcing bars 4 and in the vicinity thereof.

2 to 5 are views showing the shape and vibration transmission range of the rod-shaped vibrator. The rod-shaped vibrator 2 used in the present invention has a structure in which a vibrating arm 3 is arranged at one end of a rod-shaped vibrating shaft 2a as shown in FIG. 2, and the shaft and the vibrating arm 3 are joined and integrated. Rod-shaped vibrating arm 3
It is constituted by a vibrating device having a built-in vibrating device 8 for vibrating in a vertical direction. Also, the rod-shaped vibrating shaft 2
A drive motor 7 is attached to the other end of the vibration motor as a vibrating body and serves as a power source of the vibrator. Electric motor 7
May be provided in each of the rod-shaped vibrators 2, or may be fed to a plurality of rod-shaped vibrators from one power source. If multiple reinforcing bars are placed in the formwork, insert multiple bar-shaped vibrators between the reinforcing bars, and then combine the multiple bar-shaped vibrators with the frame etc. at the top, Can be moved.

As the vibrator 8 for giving vibration, it is preferable that the vibrating portion has a cylindrical shape, and the vibration generating method is an eccentric weight method, a planetary motion method or the like as shown in FIG. An eccentric weight system is preferred. By the way, as shown in FIG. 6, the eccentric weight system is a vibration shaft 10 of the eccentric weight.
When both ends of the are supported by the fixed portions 11 of the rotary shaft 9 and rotated by an electric motor or the like, the center of gravity is different from the center, so that the center of gravity moves to cause vibration.

The vibrating arm 3 attached to the rod-shaped vibrating shaft 2a of the rod-shaped vibrator 2 used in the present invention has a shape of a flat plate, a curved plate, a rod or the like, and the number of attached arms is preferably two or more. The flat plate may have a rectangular shape, a square shape, a rhombus shape, a parallelogram shape, a bow tie shape or the like, and a rectangular shape is particularly preferable. The thickness of the flat plate is 0.2
A vibrating plate of mm to 7.0 mm is preferable, especially 2 mm to 4 m.
m is preferred. If the diaphragm is too thick, it is difficult for vibration to be transmitted, and if it is too thin, the frequency is unstable. Further, as shown in FIG. 4, the number of vibrating arms 3 attached to the axial direction of the rod-shaped vibrating shaft 2a may be two or more, and particularly preferably two to four. In the structure in which the plate-shaped body is attached to the tip of the rod-shaped vibrating shaft 2a, the vibration acceleration becomes small and the transmission range becomes narrow. Therefore, it is preferable that the vibrating arm 3 be attached to the side surface of the rod-shaped vibrating shaft 2a.

When the rod-shaped vibrator 2 is inserted into the mold 1 into which the mortar for ALC is inserted, since the reinforcing bar 4 is arranged, the vibrating arms 3 including the vibrating shaft 2a vibrate so that they are arranged on the same plane. It is preferable to use two arms 3. As shown in FIG. 2 and FIG. 3, the vibration generated from the tip of the vibrating arm 3 is transmitted to the mortar for lightweight aerated concrete, which promotes the movement of coarse bubbles in the vibration transmission range and gradually defoams above the mortar. Go. When the number of vibrating arms 3 attached to the rod-shaped vibrating shaft 2a is one, the defoaming effect is great at or near the contact with the vibrating body,
Since the effect decreases as the distance increases, the vibration transmission range becomes narrower. On the other hand, when the number of vibrating arms is two or more, the vibration transmission range is widened according to the number of vibration transmission points, and the defoaming effect is exerted over a wide range.

The rod-shaped vibrator 2 used in the present invention is inserted between the reinforcing bars arranged in the formwork 1 or on the upper surface of the reinforcing bar, and the arm of the vibrating arm 3 is inserted parallel to the reinforcing bar. And The amplitude and frequency are set to prevent coarse air bubbles from being generated, and to prevent air entrapment due to the waviness of the liquid surface.
Maximum amplitude is 50 mm, maximum frequency is 2 per minute
It is preferable to set 0000 times, and the minimum amplitude and the minimum frequency at which the defoaming of the coarse bubbles is recognized are 0.1 mm and 100 times per minute, and particularly the amplitude is 1 to 10 mm and the frequency is 9000 to 7,000 minutes per minute. A range of 14,000 times is preferable. The vibration time is 5 minutes at maximum after pouring into the mold so that the mortar can be defoamed while keeping the mortar in a liquid state, and the flowability of the mortar is preferably up to 120 seconds, particularly preferably 90 seconds.

The raw material mortar used in the present invention comprises a siliceous raw material, a calcareous raw material, water and a foaming agent as main components. The mortar for ALC is mainly composed of a siliceous raw material, a calcareous raw material, water and a foaming agent, and is composed of, for example, cement, quick lime, silica stone, gypsum, crushed waste, water, metallic aluminum or the like. These mortars need to be prepared for optimum viscosity. If the viscosity of the mortar is too high, the mixed air becomes difficult to escape from the mortar, and if the viscosity is low, cracks due to drying shrinkage occur. Therefore, the rotational viscometer (Yamazaki type YV-1-400, SS-1, E100-2
The viscosity measured by 0A type) is preferably in the range of 450 to 740 g · cm, and particularly preferably in the range of 450 to 740 g · cm.

[0014]

Example 1 Quartz stone (Blaine 3000 cm ² / g) 50
Part, quicklime 10 parts, ordinary Portland cement 35 parts,
To 100 parts of a mixture consisting of 5 parts of gypsum, 70 parts of water and 0.07 part of aluminum metal powder were added and kneaded to obtain a viscosity of 6
A mortar slurry of 00 g · cm (measured by a rotational viscosity type) was prepared.

After injecting this mortar slurry into a mold having a width of 600 mm, a length of 600 mm and a height of 600 mm, the rod-shaped vibrator (P-23F type, manufactured by Hayashi Vibrator Co., Ltd.) shown in FIG. 2 is placed in the center of the mold shown in FIG. Inserted into the part, the frequency is 11,000 to 14,000 times per minute, and the amplitude is 0.8 mm for 3
Excited for 0 seconds. Next, the hardened mortar was removed from the mold, and cut into a panel shape having a thickness of 100 mm, a length of 600 mm and a height of 600 mm with a piano wire, and subjected to autoclave curing. The surface of the obtained product was cut and polished, and the number of coarse bubbles having a diameter of 3 mm or more was measured. The results are shown in Table 1.

[0016]

Comparative Example 1 The same raw material slurry as in Example 1 was used, and an autoclave was cured by applying vibration acceleration with a rod-shaped vibrator without a vibrating arm. The number of coarse bubbles having a diameter of 3 mm or more was measured in the same manner as in Example 1 above. The results are shown in Table 1.

[0017]

Comparative Example 2 The same raw material slurry as in Example 1 was used, and autoclave curing was performed by a rod-shaped vibrator without a vibrating arm, without applying vibration acceleration. The number of coarse bubbles having a diameter of 3 mm or more was measured in the same manner as in Example 1 above. The results are shown in Table 1.

[0018]

[Table 1]

As shown in Table 1 above, a considerable amount of coarse air bubbles remained in the object which was not given the vibration acceleration, and when the vibration acceleration was given, it was reduced to about 1/5. Furthermore, it was reduced to about 1/17 by attaching the vibrating arm.

[0020]

According to the present invention, by injecting mortar into a mold having reinforcing bars and inserting a bar-shaped vibrator between the reinforcing bars, the vibration generated from the tip of the vibrating arm falls within the vibration transmitting range. It is possible to promote the defoaming of certain coarse bubbles and reduce the coarse bubbles inside and on the surface of the panel to form uniform bubbles over a wide range. Further, since the coarse bubbles are eliminated, waterproofing or painting of the panel surface with a spraying material or the like becomes easy, and lightweight cellular concrete which is favorable in appearance and strength can be manufactured.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a state in which a rod-shaped vibrator of the present invention is placed in a mold.

FIG. 2 is a front view of the rod-shaped vibrator of the present invention.

FIG. 3 is a plan view of a rod-shaped vibrator of the present invention.

FIG. 4 is a front view showing another example of the rod-shaped vibrator of the present invention.

FIG. 5 is a plan view showing another example of the rod-shaped vibrator of the present invention.

FIG. 6 is a front view of an eccentric weight-type vibrator of the rod-shaped vibrator of the present invention.

[Explanation of symbols]

 1 Formwork 2 Rod Vibrator 2a Rod Vibrating Shaft 3 Vibrating Arm 4 Reinforcing Bar 5 Mortar 6 Vibration Transmission Surface 7 Electric Motor 8 Vibrator 9 Rotating Shaft 10 Vibration Shaft

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location B28B 17/00 Z C04B 38/02 A

Claims (3)

[Claims] 1. A rod-shaped vibrator having a plurality of vibrating arms protruding from the outer periphery of a rod-shaped vibrating shaft in the rod-shaped vibrator. 2. A vibration defoaming method for mortar, which comprises inserting the rod-shaped vibrator according to claim 1 into a mortar in a mold to defoam. 3. The vibration defoaming method according to claim 2, wherein the mortar is a mortar for lightweight cellular concrete.