JPS62248753A - Apparatus for finishing surface of concrete - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] "Industrial Application Field" This invention is applicable to flooring,
This invention relates to a concrete surface finishing device used to form a dense and flat surface on the surface of walls, etc.

``Conventional technology'' To finish the concrete surface, after pouring the concrete, the unevenness caused by the aggregate and the overall unevenness are smoothed out using a wooden trowel. The irregular surfaces were pressed down and flattened by hand using a trowel. Then, if necessary, after 2 to 3 hours have elapsed, a second to third pressing with a metal trowel is performed to reduce the surface of the concrete with a metal trowel and exude the viscous cement paste. This was spread out to remove unevenness caused by sand particles and to obtain a smooth surface.

"Problems to be solved by the invention" In the above conventional concrete surface finishing method, (1)
(2) Because it is manual work using a metal trowel, the work efficiency is low and the work is extremely tiring. (2) To obtain an 8-quality finished surface, it is necessary to press the metal trowel two or more times. (3) Holding down with a metal trowel takes 5 to 10 hours, including concrete placement time, breathing water dissipation time, and metal trowel work time, so if you level the concrete directly, the work will be finished with deep liquid. It is inevitable that
(4) The thickness of the cement paste layer is 0.1111-0.
There were problems such as: (5) sand particles were exposed on the surface, and (6) surface hardness was low.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides an ultrasonic transducer (2) having a thin rectangular tip surface (2a). ) is attached to the back of the iron plate (1) so that it is horizontally elongated in the direction of movement of the iron plate (1), and a vibration generating device that generates vibrations in a direction parallel to the surface of the iron plate (1). (6) A concrete surface finishing device is provided.

``Operation'' When ultrasonic imaging is applied to the surface of concrete that has not hardened yet, only particles of the size of cement particles aggregate on the vibrating surface, forming a thick, dense layer with an extremely smooth surface. However, this dense layer adheres tightly to the vibrating surface, and its adhesion is so strong that it cannot be scraped off with fingers. In order to apply this effect of forming a dense layer composed of particles about the size of cement particles to floor finishing work, as shown in Figure 4, the humidifying plate ( 20〉 was moved in the direction of the arrow while applying it to the surface of the concrete (21) which had not hardened yet, and the surface of the vibration plate (20) appeared on the surface of the concrete (21) where the vibration plate (20) had passed. A shallow groove-like depression (23) with a width equal to the diameter of the circular dense layer (22) adhered to the surface was formed in a linear manner.

In order to form a flat, continuous, and dense surface without such dents (23) on the floor surface, it is necessary to move the vibrating plate (20) while sequentially forming dense layers (22) as the vibration plate (20) moves. For this purpose, the dense layer (22) is used as the vibration plate (20).
must be prevented from adhering to the surface.

As a method, a release material (fluororesin) was applied to the excitation surface, and a film (polyethylene or polyvinylidene chloride) was inserted between the excitation surface and the concrete surface. It was not possible to prevent the adhesion of a dense layer.

In this invention, as a result of providing an ultrasonic vibrator that applies circular vibration or reciprocating vibration in a direction parallel to the plate surface to the iron plate, which is the vibration plate, and has a thin rectangular tip end surface, i! Continuous flat and dense layer! ? I was able to

Its action is shown in Fig. 5, in which an ultrasonic transducer (2) with a thin rectangular end face (2a) is lightly placed on unhardened concrete (24) and moved in the direction of the arrow (25). When longitudinal vibration is applied by the longitudinal vibration generator, the concrete (24) directly under the tip surface (2a) of the ultrasonic vibrator (2) becomes a dense compact plate with a thin rectangular cross section of thickness a). cement paste (2
6), and the tip surface (2a
The concrete (24) behind ) has already become a dense cement paste (27). The vibration is an arrow (
25), the cement paste (27) in the rear, which is already in a dense and compacted state, is in the plate shape attached to the lower surface of the tip surface (2a) of the ultrasonic transducer (2). It is then compacted with a dense compacted cement paste (26). At this time, this cement paste (26)
The force received by the ultrasonic transducer (2) is the adhesion stress (28) of the cement paste (26) to the tip surface (2a) of the ultrasonic vibrator (2) and the area (thickness a) of the tip surface (2a) of the ultrasonic vibrator (2).
The force (A>, which is the product of The area of the tip surface (2a) is significantly smaller than the area of the cement paste (26), so the force (B)
overcomes the force (A>) and the tip surface (2) of the ultrasonic transducer (2)
The cement paste (26) is now peeled off from a), and the cement paste (26) is separated from the cement paste (
27). As the ultrasonic transducer (2) advances in the direction of travel (25) and changes its mechanical force during imaging, the cement paste (2) adhering to its tip (2a) is removed.
6) is peeled off from the tip (2a) and cement paste (
27), and this left behind cement paste (26) becomes integrated with cement paste (27) and performs 190% of peeling off the next attached cement paste (26), thereby causing ultrasonic vibration. As the layer (2) progresses, a layer of cement paste with a compact shape (g) is formed. In addition, the ultrasonic transducer
2) Instead of applying forward vibration to (or the iron plate),
Even when circular vibration is applied, since the circular vibration includes a vibration component in the front-rear direction, the same result as above can be obtained by 1q.

"Embodiment" An embodiment of the present invention will be described with reference to FIGS. 1 to 3. (1) is a trowel plate, on which a large number of ultrasonic transducers (2) having thin rectangular tip surfaces (2a) are provided. (See Figures 2 and 3) (3) is a handle, which is attached to the top plate (4), and a motor (5) is installed in the center of the top plate (4). .

(6) is a circular vibration generator which is attached to the upper plate (4) via a rubber plate (7) or bellows, and the shaft (8) of the motor (5) is extended through the upper plate (4) to create a universal The shaft (10) connected by the int (9) is connected to the bearing (11).
), and an eccentric lever (12) is provided on the shaft (10). The trowel plate (1) and the upper plate (4) are welded together and covered with a bellows (14) to prevent concrete and other foreign matter from entering.

When you hold the handle (3) and move the trowel plate (1) onto the unhardened concrete, the ultrasonic vibrator (2)
), a relatively thick and dense layer of particles with a particle size similar to cent particles is formed on the surface of the concrete, and the circular vibration generator causes the trowel plate (1) to vibrate in a circular manner. By moving the plate (1), this dense layer is peeled off from the trowel plate (1) to form a continuous flat surface, allowing finishing of concrete surfaces such as floors.

``Effects of the Invention'' Since the present invention comprises the above-mentioned means, it is possible to form a smooth, dense layer of particles with a particle size similar to that of cement particles on the surface of concrete, much thicker than when using a metal trowel. . As a result, the penetration of carbon dioxide gas in the air is extremely small, significantly delaying the carbonation of concrete, and the hard, dense layer of cement improves the abrasion resistance of the concrete surface, which cannot be achieved with conventional metal trowel finishing. Achieves a high-quality surface finish that cannot be achieved with other surfaces.

Furthermore, since a dense layer, which could conventionally only be obtained by hard mixing, can be obtained in a soft mixing state, it is also possible to easily level concrete that has been placed by soft mixing.

In addition, worker fatigue is significantly reduced because workers only need to place the trowel on the concrete surface and move it without applying force like using a metal trowel. Since a high-quality surface can be obtained, work efficiency is high, and the work can be completed without having to work late at night.

[Brief explanation of drawings]

Figures 1 and 2 show one embodiment of the present invention, with Figure 1 being a vertical front view, Figure 2 being a back view, Figure 3 being a perspective view of the ultrasonic transducer, and Figure 4 being a perspective view of the ultrasonic transducer. FIG. 5 is a longitudinal sectional front view showing the state of concrete when an ultrasonic vibrator is attached to a vibrating plate and moved. FIG. 5 is a longitudinal sectional front view illustrating the present invention in detail. (1)... Trowel plate, (2)... Ultrasonic sensor, (2
a)... Tip surface, (6)... Vibration generator.

Claims (1)

[Claims] An ultrasonic transducer (2) having a thin rectangular tip surface (2a) is placed on a trowel plate so that the tip surface (2a) is horizontally elongated in the direction of movement of the trowel plate (1). A concrete surface finishing device that is attached to the back of the concrete surface (1) and is equipped with a vibration generator (6) that generates vibrations on the trowel plate (1) in a direction parallel to the surface of the trowel plate (1).