JPH0446022Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a concrete vibrator, and is particularly suitable for concrete compaction and vacuum suction near the formwork provided during concrete pouring. Regarding vibrators.

<Prior Art> In order to improve the quality of concrete, vibration is usually applied to the concrete immediately after it is placed to compact it.

With this compaction, water leaks around the reinforcing bars of the concrete and onto the surface of the formwork, and air bubbles (avatars) are generated on or inside the concrete.

Vacuum suction of concrete is effective in removing this water and air bubbles.

Conventionally, devices that perform the above-mentioned compaction and vacuum suction at the same time are inserted into the concrete and compacted by applying vibrations to the concrete, and at the same time sucking out excess water and air bubbles contained in the concrete using a vacuum pump. A rod-shaped vibrator that is designed to achieve high density is known.

An example of this rod-shaped vibrator is shown in FIG. 5A and FIG. 5B, taken along the line V-V in the same figure.

In the same figure, the rod-shaped vibrator main body 51 is
A rod-shaped vibrating section 53 is placed inside a bottomed cylindrical container 52 made of a material having pores (for example, punched metal with a vacuum mat such as a mesh cloth attached tightly), and a rod-shaped vibrating section 53 is installed on the inner wall surface of the bottomed cylindrical container 52. It is housed coaxially with the bottomed cylindrical container 52 with a plurality of coil springs 54 interposed therebetween.

From the upper end of this rod-shaped vibrator 51, one end is located at an appropriate position of the rod-shaped vibrating section 53 (the upper end in the figure).
A lead shaft 55 connected to the suction hose 56 and a suction hose 56 whose one end is disposed in the hollow part of the bottomed cylindrical container 52 are pulled out.

The other end of the lead shaft 55 is connected to a vibrator body 57 which is a vibration source, and the other end of the suction hose 56 is connected to a vacuum pump 58.

The manner in which this rod-shaped vibrator 51 is used will be explained with reference to FIG. 6, taking as an example the construction of a reinforced concrete (hereinafter referred to as RC) column.

In the figure, reinforcing bars such as vertical-axis reinforcing bars 61 and hoop bars 62 are constructed in a columnar manner, the four sides of these reinforcing bars are surrounded by formwork 63, and concrete 60 is poured.
Immediately after this, the rod-shaped vibrator 51 is sunk into the concrete 60. Next, the vibrator body 57
The vibration from the lead shaft 55, rod-shaped vibrating part 5
3. Compact the concrete 60 by applying it to the concrete 60 via the coil spring 54 and the bottomed cylindrical container 52.

Excess water and air bubbles in the concrete 60 generated by this compaction are removed from the pores of the bottomed cylindrical container 52 by the suction force of the vacuum pump 58.
2 and is sucked out to the outside of the rod-shaped vibrator 51 via the suction hose 56.

《Problems to be solved by the invention》 By the way, in this type of vibrator,
From the viewpoint of work efficiency, it is necessary to propagate vibrations into the concrete as widely as possible, so it is necessary to have a large outer diameter.

However, in reinforced concrete such as RC columns, as is clear from FIG. 6, the cover thickness, that is, the distance between the formwork 63 and the tie bars 62 is small, so the rod-shaped vibrator 51 is operated close to the formwork 63. This was not easy, and compaction and vacuum suction near the formwork 63 were difficult. Therefore, the vertical axis reinforcing bar 6
1. Breathing water and air bubbles are likely to occur around the reinforcing bars such as the tie bars 62 and on the surface of the formwork 63, making it difficult to place high-quality concrete, and ultimately reducing the durability and aesthetics of concrete buildings. There was a problem.

In order to ensure sufficient compaction and vacuum suction in the vicinity of the formwork 63, a conventional method has been proposed in which vibration is applied to the concrete 60 from outside the formwork 63.

However, in this method, a vacuum mat such as a mesh cloth must be placed over the entire surface of the formwork 63, which requires a great deal of time and effort, and poses problems in terms of work efficiency and cost.

The present invention was developed in view of the above-mentioned problems, and its purpose is to ensure sufficient compaction and vacuum suction especially near the formwork, thereby improving the durability of concrete after drying. An object of the present invention is to provide a vibrator for concrete that can improve the aesthetic appearance.

<Means for Solving the Problems> In order to achieve the above object, the present invention includes a bottomed cylindrical part inserted into concrete, and a cylindrical part that extends horizontally from the bottomed cylindrical part integrally. an extending flat plate-like fin, a vibrating part that vibrates the bottomed cylindrical part and the fin, a hollow part formed inside at least one of the bottomed cylindrical part and the fin, and a vibration part of the vibrating part. Therefore, it is characterized by comprising a porous hole for extracting excess water and air bubbles from the concrete into the hollow part, and a suction hose for discharging the excess water and air bubbles extracted into the hollow part through the porous hole to the outside. It is something to do.

<<Operation>> In the concrete vibrator according to the present invention, vibrations from the vibrating part are transmitted through the bottomed cylindrical part and the flat fins that integrally extend radially from the bottomed cylindrical part in the horizontal direction. , propagates to the concrete around the vibrator and causes this concrete to vibrate. The concrete is compacted by this vibration, and excess water and air bubbles in the concrete are extracted through the holes in the bottomed cylindrical part or the hollow part inside the fins, and are sucked out by a vacuum pump via a suction hose, and the excess water and air bubbles in the concrete are extracted from the outside of the concrete. is discharged to. As a result, the concrete is compacted and vacuum suctioned immediately after it is poured.

《Example》 Fig. 1 shows a first embodiment of a vibrator for concrete according to the present invention, Fig. 1A is a front view, Fig. 1B is a sectional view taken along line I-I in Fig. 1A, FIG. 1C is a side view.

The concrete vibrator 1 is composed of a bottomed cylindrical part 2 provided at the center and flat plate-shaped fins 9, which integrally extend radially from the bottomed cylindrical part 2 in the horizontal direction.

A hollow portion is formed inside the bottomed cylindrical portion 2 and the fins 9, 9, and each hollow portion is in communication with the slit provided at the connection portion between the bottomed cylindrical portion 2 and the fins 9, 9. It is becoming.

Further, the bottomed cylindrical portion 2 and the fins 9, 9 are made of a perforated iron plate such as punched metal or ribrass, and have holes that communicate between the inside and outside of the bottomed cylindrical portion 2. A vacuum mat 10 such as a mesh cloth is tightly attached to the outer surface and the bottom and the outer surface of the fins 9,9.

A rod-shaped vibrating body vibrating section 3 is housed coaxially with the bottomed cylindrical section 2 with a plurality of coil springs 4 interposed between the inner wall surface and the bottomed cylindrical section 2 . Further, a lead shaft 5 whose one end is connected from the upper end of the bottomed cylindrical part 2 to the upper part of the rod-shaped vibrating body 3;
A suction hose 6 whose one end is disposed in the hollow part of the bottomed cylindrical part 2 is pulled out, and the other end of this lead shaft 5 is connected to the vibrator main body 7 which is a vibration source. are connected to the vacuum pump 8, respectively.

The following design changes can be made to the first embodiment shown in FIGS. 1A to 1C.

First, the bottomed cylindrical portion 2 can be configured without pores. Also in this case, one end of the suction hose 6 is connected to the top or side of the fins 9, 9.

On the other hand, the fins 9, 9 can be made of a flat plate-like material that does not have pores and can be configured without providing a hollow portion inside.

The vibration source is replaced by a rod-shaped vibrating body 3 instead of the external vibration source as described above.
You can use what you have inside. In this case, a power cord may be connected to the rod-shaped vibrating body 3 instead of the lead shaft 5 described above.

FIG. 2 is a cross-sectional view showing an example of how the concrete vibrator according to the present invention shown in FIG. 1 is used. In FIG. 2, the same reference numerals as in FIG. 6 indicate the same parts as in FIG.

As shown in FIG. 2, the concrete vibrator 1 is sunk into the concrete 60 immediately after the concrete 60 is placed. Next, the vibrator body 7 is operated to apply vibration to the concrete 60 via the lead shaft 5, the rod-shaped vibrating body 3, the coil spring 4, the bottomed cylindrical portion 2, and the fins 9, 9. This vibration propagates within the concrete 60 within an effective distance L from the bottomed cylindrical portion 2 and the fins 9, 9, and compacts the concrete.

Excess water and air bubbles in the concrete 60 generated by this compaction are extracted into the internal hollow part through the pores of the vacuum mat 10 that is tightly attached to the bottomed cylindrical part 2 and the fins 9, 9 by the suction force of the vacuum pump 8. and is discharged to the outside via the suction hose 6.

Hereinafter, other embodiments will be described with the same reference numerals assigned to the same components as in the first embodiment.

FIG. 3 is an explanatory diagram showing a second embodiment of the vibrator for concrete according to the present invention.

As shown in the figure, in this embodiment, fins 9, 9 whose cross-sectional shape is fan-shaped are used.

According to the concrete vibrator 1 of this embodiment, it can be suitably used for an RC column whose cross-sectional shape is circular, or an RC column whose reinforcing bar portion is circular in cross-section.

FIG. 4 is an explanatory diagram showing a third embodiment of the vibrator for concrete according to the present invention and an example of its usage mode.

In this embodiment, the approximately rectangular fins 9, 9 are
One side of it is 90 degrees from the other including the central axis of the bottomed cylindrical part 2.
It is connected to the outer surface of the bottomed cylindrical portion 2 within two planes that intersect at an angle of .degree.

According to the concrete vibrator 1 of this embodiment, as shown in FIG. 4, it can be suitably used for various parts of RC columns whose cross section is square.

Note that the above angle is not limited to 90 degrees, but can be any angle less than 180 degrees.

Furthermore, without being limited to the above-mentioned embodiments, the concrete vibrator according to the present invention has a cross-sectional shape of the bottomed cylindrical portion 2 such as an elliptical shape, a square shape, etc. Furthermore, the shape of the fins 9, 9 can also be semicircular, etc. It can have various shapes such as a triangle. In addition, the diameter of the bottomed cylindrical portion 2,
The length, thickness, size, etc. of the fins 9, 9 can also be varied. Moreover, Finn 9,
9 can be either fixed to the bottomed cylindrical portion 2 or detachable.

Further, the location of use is not limited to the RC column of the embodiment, but can be used in various locations or members such as steel reinforced columns, foundations, floors, beams, etc. The above-mentioned cross-sectional shape, size, arcuate angle of the fins 9, 9, mounting angle, etc. may be appropriately selected depending on the location and member to be used. Furthermore, a configuration in which the fins 9, 9 are directly connected can be adopted. In this case, one end of the suction hose 6 is connected to the top or side of the fins 9,9.

<<Effects of the invention>> According to the vibrator for concrete according to the present invention, the following effects can be achieved.

(1) Concrete compaction and vacuum suction can be easily performed in narrow areas near formwork provided during concrete pouring, and as a result, the durability of concrete buildings is improved.

(2) Since the vibration is applied from the bottomed cylindrical part and the fins, the effective distance for vibration propagation is large, and even when used near the formwork, concrete compaction and vacuum suction can be performed to the center.

(3) By changing the shape of the fins and the angle of attachment to the bottomed cylindrical part, it can be easily used in concrete casting parts of various shapes or square parts.

(4) Since it mainly consists of a bottomed cylindrical portion and fins, it is easy and inexpensive to manufacture.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing a first embodiment of a vibrator for concrete according to the present invention, in which Fig. 1A is a partially cutaway front view, and Fig. 1B is a sectional view taken along the line I-I of Fig. 1A. , FIG. 1C is a side view of FIG. 1A, FIG. 2 is an explanatory view showing an example of the usage of the first embodiment shown in FIG. 1, and FIG. 3 is a second view of the concrete vibrator according to the present invention. FIG. 4 is an explanatory diagram showing a third embodiment of the concrete vibrator according to the present invention and an example of its usage, and FIG. 5A is a cross-sectional view showing the embodiment.
is a longitudinal sectional view, Fig. 5B is a transverse sectional view, and Fig. 6 is a 5th sectional view.
It is a figure which shows the usage example of the rod-shaped vibrator shown in a figure. 1... Vibrator body for concrete, 2...
...Bottomed cylindrical part, 3... Rod-shaped vibrating body (vibrating part), 4
...Coil spring, 5...Lead shaft, 6...
Suction hose, 7... Vibrator body, 8... Vacuum pump, 9... Fin, 10... Vacuum mat.

Claims (1)

[Scope of utility model registration request] A bottomed cylindrical part inserted into concrete, flat plate-shaped fins that integrally extend radially from the bottomed cylindrical part in the horizontal direction, and a vibrating part that vibrates the bottomed cylindrical part and the fins. a hollow part formed inside at least one of the bottomed cylindrical part and the fin; a porous hole for extracting excess water and air bubbles from the concrete into the hollow part by vibration of the vibrating part; A vibrator for concrete comprising a suction hose that discharges excess water and air bubbles extracted into the hollow part through the holes to the outside.