JP2006016868A - Foam reducing vibrator and foam reducing method for concrete - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibrator reducing air bubbles on the surface of concrete, adjusting the space between the spade board and the mold form with ease. <P>SOLUTION: The air bubble reducing vibrator on the concrete surface has a vibrator body connecting a motor or a built-in motor, a spade board, and a joint part connecting the vibrator and the spade board. The air bubble reducing vibrator is constituted to satisfy the following conditions; (1) The spade board is connected to the vibrator body through the joint which joints at the deviated position from the center shaft of the vibrator body. (2) The spade board approaches the center axis of the vibrator body than the joint position with the vibrator body of the joint part. (3) The spade board is substantially parallel to the center shaft of the vibration body. And further, the bubble reducing vibrator is favorable when it has a spacer. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a concrete vibrator used by being inserted into uncured concrete, and more specifically, by eliminating or removing bubbles generated near the interface between uncured concrete and a formwork, The present invention relates to a concrete bubble reduction vibrator for reducing bubbles, particularly bubbles on a surface. In addition, the present invention relates to a method for reducing the bubbles of concrete by reducing the bubbles of the uncured concrete by reducing the bubbles of the uncured concrete, and more specifically, occurred near the interface between the uncured concrete and the formwork. The present invention relates to a concrete bubble reduction method for reducing concrete bubbles, particularly bubbles on the surface, by eliminating or removing the bubbles.

When concrete is poured into a mold to produce a hardened concrete body, most of them are compacted using a vibrator for the purpose of preventing poor filling. This vibrator is broadly classified into an internal vibrator that is used by inserting a vibrator into uncured concrete and an external vibrator that vibrates a formwork or the like from the outside without inserting the vibrator into uncured concrete. Even if these vibrators are used, bubbles generated at the interface between the uncured concrete and the mold cannot be sufficiently reduced, and there are many bubbles on the surface of the concrete after hardening and demolding. It is not preferable in terms of quality such as aesthetics of concrete and neutralization of concrete. A vibrator having a gutter plate for reducing the bubbles has been proposed (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3). However, it is difficult to adjust the gap between the plate and the formwork with the conventional concrete bubble reduction vibrator, and the surface of the plate and the formwork comes into contact with each other. When traces appear greatly, or when the platen and the formwork are separated too much, problems such as inability to reduce bubbles may occur.
Japanese Utility Model Publication No. 64-43150 Japanese Utility Model Publication No. 64-26463 JP-A-11-107530

  The present invention has been made in view of the above circumstances, and provides a concrete bubble reduction vibrator capable of easily adjusting the gap between a plate and a formwork and reducing concrete bubbles, particularly bubbles on the surface. For the purpose. It is another object of the present invention to provide a method for reducing concrete bubbles that easily reduces the air bubbles in the concrete after curing, particularly the air bubbles on the surface.

That is, the present invention is a concrete bubble reduction vibrator represented by the following (1) or (2) and a concrete bubble reduction method represented by (3).
(1) A concrete bubble reduction vibrator having a vibrating body for connecting or incorporating an electric motor, a gutter plate, and a connecting portion for coupling the vibration body and the gutter plate, and having the following conditions:
A) The flange plate is connected to the vibrating body via the connecting portion joined at a position deviating from the central axis of the vibrating body.
A) The flange plate is closer to the central axis of the vibrating body than the position where the connecting portion is joined to the vibrating body.
C) the gutter plate is substantially parallel to the central axis of the vibrator;
Concrete bubble reduction vibrator that meets the requirements. (2) The concrete bubble reduction vibrator according to (1), further comprising a spacer. (3) A method for reducing bubbles in concrete, wherein the bubble reducing vibrator of (1) or (2) is inserted in the vicinity of an uncured concrete mold and vibrated.

  ADVANTAGE OF THE INVENTION According to this invention, since it is easy to adjust the space | interval of a base plate and a formwork, the concrete bubble reduction vibrator which can reduce a concrete bubble, especially the surface bubble is obtained. The concrete hardened body obtained by using the concrete bubble reduction vibrator of the present invention is neutralized in that there are very few bubbles in the concrete, especially on the surface, and there is no trace of contact between the plate and the formwork on the concrete surface. It becomes a hardened concrete body with excellent quality and aesthetics. This hardened concrete body can omit the finish coating material. In addition, according to the present invention, a method of reducing concrete bubbles can be easily obtained which can easily reduce bubbles of concrete, particularly bubbles on the surface.

The concrete bubble reduction vibrator of the present invention is a concrete bubble reduction vibrator having a vibrating body that connects or incorporates an electric motor, a gutter plate, and a connecting portion that couples the vibration body and the gutter plate. Conditions,
A) The flange plate is connected to the vibrating body via the connecting portion joined at a position deviating from the central axis of the vibrating body.
A) The flange plate is closer to the central axis of the vibrating body than the position where the connecting portion is joined to the vibrating body.
C) the gutter plate is substantially parallel to the central axis of the vibrator;
It is a bubble-reducing vibrator for concrete that satisfies the above requirements. The number of electric motors, vibrators, ribs, and connecting portions provided in the bubble reduction vibrator of the present invention may be one or more. Further, it is preferable to provide a spacer.

  The vibrator used in the bubble reduction vibrator of the present invention is connected to or built in an electric motor. When connecting a vibration body and an electric motor, you may connect a vibration body and an electric motor directly, and you may connect via a flexible shaft between a vibration body and an electric motor. The vibrator and electric motor used in the present invention are preferably compatible with JIS A 8610 “concrete rod vibrator”.

  The gutter plate used in the bubble reduction vibrator of the present invention is preferably a plate having a plurality of holes. It is preferable that the total area of the holes provided when viewed from the front side of the steel plate is 20% to 80% of the surface area of the steel plate, since the air bubbles in the concrete, particularly the air bubbles on the surface can be further reduced. The size of the hole is not particularly limited, but is preferably less than or equal to the maximum size of the coarse aggregate in the concrete. The coarse aggregate in the concrete does not pass through, but a size that allows cement and fine aggregate to pass through is more preferable. The shape of the hole is not particularly limited, and examples thereof include a circular shape, a polygonal shape, an elliptical shape, a semicircular shape, and a combination thereof, as viewed from the front side of the plate. The shape of the plate is not particularly limited, but it is preferably a substantially flat plate, and when viewed from the front of the plate, the shape is a polygon such as a triangle, a quadrangle, or a pentagon, an ellipse, a circle, and a combination thereof. It can be illustrated. Although the material of the said board is not specifically limited, For example, metals, such as aluminum, iron, and stainless steel, resin, ceramics etc. can be illustrated. The size of the slats is not particularly limited, but the length is 0.3 to 2.0 times the casting height of concrete once, the width is 5 cm to 150 cm, and the thickness is 0.1 cm to 1 cm is preferable.

  The said board is connected with the said vibrating body through the connection part joined in the position which remove | deviates from the central axis of this vibrating body. The magnitude | size and material of a connection part are not specifically limited. The shape of the connecting portion is not particularly limited as long as the rib plate is closer to the central axis of the vibrating body than the joint position of the connecting portion with the vibrating body and can be substantially parallel to the central axis. Here, the meaning of being substantially parallel to the central axis of the vibrating body includes the case where the central axis is on the saddle plate, and the intersection angle between the central axis of the vibrating body and the saddle plate is 10 °. Or less, preferably parallel. The joint position of the connecting portion with the vibrating body or the connecting portion is a guide when the bubble reducing vibrator of the present invention is inserted into concrete. The said saddle plate and the said connection part, the said vibrating body and the said connection part, or the said saddle plate, the said vibrating body, and the said connection part may be shape | molded integrally.

  The bubble reducing vibrator of the present invention is preferably provided with a spacer. The spacer prevents contact between the plate and the formwork. The location, number, shape and material of the spacer are not particularly limited. The distance between the plate and the mold can be prevented and the distance between the plate and the mold can be reduced within the range of air bubbles on the concrete surface. It only needs to be adjusted within. The spacer may be installed on any of the plate, the vibrating body, and the connecting portion. You may make the said connection part the shape and magnitude | size which can fulfill | perform the function as a spacer.

  The method for reducing bubbles in concrete according to the present invention is characterized in that the bubble reducing vibrator is inserted in the vicinity of an uncured concrete mold and vibrated. The bubble reducing vibrator described above is inserted in the vicinity of the uncured concrete mold and vibrated to reduce bubbles in the vicinity of the concrete mold. Further, by moving the vicinity of the concrete mold up and down and / or right and left while vibrating the bubble reducing vibrator, bubbles near the concrete mold are further reduced. The vibration of the electric motor is transmitted to the vibrating body and further transmitted to the saddle plate through the connecting portion. This vibration causes the bubbles in the concrete near the interface between the uncured concrete and the formwork to disperse and the size of the bubbles to decrease, move to the top surface of the concrete due to the difference in specific gravity, or burst, Since it decreases by coming out of the top surface of the concrete and rupturing, etc., the bubbles in the concrete after hardening and demolding, especially the bubbles on the surface, are greatly reduced. The timing for starting the vibration of the bubble reduction vibrator is not particularly limited, and may be before or after the bubble reduction vibrator is inserted in the vicinity of an uncured concrete mold.

  The bubble reduction vibrator is connected to the vibrating body via a connecting portion where the rib plate is bonded at a position shifted from the central axis of the vibrating body, and the rib plate is bonded to the vibrating body at the connecting portion. The bubble reducing vibrator of the present invention is inserted in the vicinity of an uncured concrete formwork or while being vibrated, because it is closer to the center axis of the vibrating body and is substantially parallel to the center axis. When moving the vicinity of the concrete formwork up and down and / or left and right, even if the connecting part comes into contact with the formwork, the plate does not come into contact with the formwork and the distance from the formwork is within an appropriate range. Can fit in.

  The joining position of the connecting portion with the vibrating body is a guideline for inserting the bubble reducing vibrator into the concrete. When the bubble reducing vibrator is inserted in the vicinity of an uncured concrete formwork or vibrated. However, when the vicinity of the concrete formwork is moved up and down and / or right and left, the distance between the plate and the formwork can be within an appropriate range.

  If the bubble reducing vibrator is provided with the spacer for preventing contact between the plate and the formwork, the distance between the plate and the formwork can be set easily and reliably. The traces of contact between the plate and the formwork do not appear, and the bubbles on the concrete surface can be reduced easily and reliably without causing any problems if the plate and the formwork are too far apart to reduce the bubbles sufficiently. .

  1, 2, 3, 4, and 5 are a schematic front view, a rear view, a left side view, and a cross-section showing a use state of an embodiment of a concrete bubble reduction vibrator according to the present invention. It is an enlarged view and a perspective view of the connection part vicinity of a figure and a left view. This concrete bubble reduction vibrator 1 includes a vibrator 3 directly connected to an electric motor 2, a connecting portion 4, and a gutter plate 5 having a number of holes 6 (length 120 cm × width 20 cm × thickness 0.5 cm). . In this embodiment, the gutter plate 5 and the connecting portion 4 are integrally formed by bending an iron plate with a press machine and punching a large number of holes 6 and bolt holes 8, and a rubber thin plate 11 is bonded to the iron plate. is there. The connecting portion 4 and the vibrating body 3 are fixed by bolts 13 and nuts 14 with the vibrating body 3 sandwiched between the fixing plate 12 and the connecting portion 4. Thus, the flange plate 5 is connected to the vibrating body 3 via the connecting portion 4 joined at a position away from the central axis 7 of the vibrating body. A contact surface between the rubber thin plate 11 and the vibrating body 3 is a joint position 9 between the connecting portion 4 and the vibrating body 3. The saddle plate 5 is closer to the central axis 7 of the vibrating body 3 than the joint position 9 of the connecting portion 4 with the vibrating body 3, and the saddle plate 5 is parallel to the central axis 7. This makes it difficult for the gutter 5 and the formwork 16 to contact each other. The connection part 4 becomes a standard when inserting the bubble reduction vibrator 1 into the uncured concrete 15. In this embodiment, the bolt 13 is a spacer for preventing the contact between the plate 5 and the mold 16. If spacers are also provided in the vicinity of the front end 10 to the center of the saddle plate 5, contact between the saddle plate 5 and the mold 16 can be further prevented. In this embodiment, the total area of the holes 6 when viewed from the front surface of the plate 5 is 50% of the area of the plate.

[Concrete block production test]
Uncured concrete 15 was driven into the mold 16 to produce a rectangular concrete block having a length of 200 cm, a height of 100 cm, and a width of 50 cm. At this time, the bubble-reducing vibrator 1 of the present invention is inserted into only half of the concrete (length 100 cm × height 100 cm × width 50 cm) while vibrating before the concrete is solidified, and up and down while contacting the bolt with the formwork. Moved left and right. The mold was demolded 7 days after placing concrete, and the ratio of the area occupied by bubbles on the side of the concrete block was measured separately for the part using the bubble reducing vibrator of the present invention and the part not using it. The area occupied by the bubbles was measured using an image analysis device after a transparent cellophane paper was applied to the side of the concrete and the bubbles having a diameter of 1 mm or more were copied.

  As a result, the ratio of the area occupied by the bubbles on the side of the concrete block in the part where the bubble reduction vibrator of the present invention was not used was 4.5%, whereas the ratio of the portion using the bubble reduction vibrator of the present invention was 4.5%. The ratio of the area occupied by the bubbles on the side of the concrete block was 0.8%. In addition, there was no trace of contact between the plate and the formwork on the side surface of the concrete block in the part using the bubble reducing vibrator of the present invention.

  According to the present invention, it is possible to easily produce a hardened concrete body in which the air bubbles of the concrete after hardening, particularly the air bubbles on the surface are significantly reduced, and thus a hardened concrete body having excellent aesthetics and quality can be obtained. Since the hardened concrete obtained by the present invention is particularly suitable for a concrete structure using exposed concrete, the present invention can be suitably used for the production of a concrete structure using exposed concrete. In addition, since the hardened concrete produced using the present invention has significantly reduced bubbles on the concrete surface and the size of the bubbles is small, when the concrete surface is finished with a finish coating material, the bubbles on the concrete surface are repaired. The process of filling with etc. can be omitted or reduced. Therefore, this invention can be used suitably also for manufacture of the concrete structure finished with a finishing coating material.

It is a typical front view showing one embodiment of a concrete bubble reduction vibrator of the present invention. It is a typical rear view showing one embodiment of a concrete bubble reduction vibrator of the present invention. It is a typical left view which shows one Embodiment of the bubble reduction vibrator of the concrete of this invention. It is typical sectional drawing which shows the use condition of one Embodiment of the bubble reduction vibrator of the concrete of this invention. It is an enlarged view of the connection part vicinity of the left view which shows one Embodiment of the bubble reduction vibrator of the concrete of this invention shown in FIG. It is a typical perspective view which shows one Embodiment of the bubble reduction vibrator of the concrete of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Concrete bubble reduction vibrator 2 Electric motor 3 Vibrating body 4 Connection part 5 Girder board 6 Hole 7 Center axis | shaft of a vibrating body 8 Bolt hole 9 Joining position of coupling part 4 with vibrator 3 10 Tip of gutter board 11 Rubber Thin plate 12 Fixed plate 13 Bolt 14 Nut 15 Uncured concrete 16 Form 17 Holding handle 18 Holding handle

Claims (3)

A concrete bubble-reducing vibrator having a vibrator that connects or incorporates an electric motor, a gutter plate, and a connecting portion that couples the vibrator and the gutter plate, the following conditions:
A) The flange plate is connected to the vibrating body via the connecting portion joined at a position deviating from the central axis of the vibrating body.
A) The flange plate is closer to the central axis of the vibrating body than the position where the connecting portion is joined to the vibrating body.
C) the gutter plate is substantially parallel to the central axis of the vibrator;
Concrete bubble reduction vibrator that meets the requirements. The concrete bubble reduction vibrator according to claim 1, further comprising a spacer. A method for reducing bubbles in concrete, comprising inserting the bubble reducing vibrator according to claim 1 or 2 in the vicinity of a mold frame of uncured concrete to vibrate.

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