JPH0810129Y2 - Bubble eliminator for rod-shaped vibrator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a rod-shaped vibrator used for concrete compaction work, and more particularly to a bubble elimination device for eliminating bubbles and the like in concrete caused by vibration of the vibrator.

[Prior Art] In compacting concrete when constructing a concrete structure, a rod-shaped vibrator a shown in FIG. 3 is used, concrete is placed in a formwork, and the rod-shaped vibrator a is placed in the concrete. As shown in FIG. 5, the concrete is directly inserted and the concrete is compacted by vibrating with a vibrator.

At this time, air bubbles b are generated on the contact surface between the rod-shaped vibrator a and the concrete c, and the bubbles b remain and disperse in the concrete c, so that many air avatars are generated on the surface of the cast concrete. , There are many cavities inside the concrete. In order to reduce the air avatars and cavities, conventionally, the working time for compaction, the insertion pitch of the rod-shaped vibrator, and the like are adjusted by a skilled person.

[Problems to be Solved by the Invention] However, when a rod-shaped vibrator is used depending on the feeling of a skilled person, there is a problem in that the result of compaction work of concrete varies. Further, there is a problem that a repair of the surface of the concrete having air avatars is required at the time of finishing the exposed concrete, resulting in a large repair cost. Furthermore, the occurrence of many air avatars and cavities weakens the strength of concrete, so if strength is emphasized, it will cause a serious problem in concrete finishing,
Management of compaction work has become a serious issue.

This invention was made in order to solve these problems, and it is possible to seal or eliminate air bubbles generated in concrete by vibrating the rod-shaped vibrator, and eliminate air bubbles and voids in the rod-shaped vibrator in the concrete. The purpose is to provide a device.

[Means for Solving the Problems] The bubble eliminating device for a rod-shaped vibrator according to the present invention covers the entire vibrating portion of the rod-shaped vibrator with a mesh cylinder having a plurality of rod-shaped ribs in the axial direction of the inner periphery, It is characterized in that the base end of the tubular body is fixed to the vibrating section, and an axial space is formed between the vibrating section and the mesh tubular body.

In this case, the hole diameter of the mesh of the reticulated cylindrical body may be 2 mm to 3 mm. Further, it is preferable that the reticulated tubular body is integrally formed of synthetic resin or rubber.

[Operation] In the bubble eliminating device of the rod-shaped vibrator of the present invention,
Attaching the mesh cylinder to the vibration part of the rod-shaped vibrator,
The ribs on the inner periphery of the mesh cylinder contact the surface of the rod-shaped vibrator and form a space there. Therefore, the vibrator vibrates and the bubbles generated on the surface of the vibrator are sealed in the inner peripheral space of the mesh cylinder, and most of the bubbles stay. Therefore, air bubbles are less likely to diffuse inside the concrete. Further, the bubbles passing through a part of the mesh are destroyed by hitting the mesh and become small bubbles, which diffuse into the concrete.

When the mesh hole diameter of the mesh cylinder is set to about 2 mm to 3 mm, bubbles can be less likely to pass through the mesh, and the ratio of bubbles to be retained in the mesh cylinder can be reduced.

Furthermore, in the case of integrally molding the reticulated tubular body with a synthetic resin, it is possible to provide a bubble erasing device which is easy to process and retain its shape and has excellent strength and durability.

[Embodiment] An embodiment of a bubble eliminator for a rod-shaped vibrator of the present invention will be described below.

The bubble elimination device of the rod-shaped vibrator shown in FIG.
When constructing a concrete structure, when compacting concrete c, it is used by being attached to the vibrating part of the bar-shaped vibrator a as shown in FIG. 2, and the upper end of the mesh-like tubular body 1 whose entire surface is meshed. It has a structure in which a ring-shaped fastener 2 is provided.

The reticulated cylindrical body 1 is a cylinder manufactured by integral molding with synthetic resin or rubber that is easy to process and has excellent strength, and has a diameter slightly larger than the outer diameter of the vibrating portion of the rod-shaped vibrator a. Thus, it is formed to be longer than the entire length of the vibrating section so that the entire vibrating section can be covered.

The mesh 3 of the reticulated cylindrical body 1 allows air to flow in and out, bubbles b generated by the vibration of the vibrator are less likely to pass through, the bubbles b can be retained inside the reticulated cylindrical body 1, and the ratio of the generation of the bubbles b is also increased. It is necessary to make the size of the hole diameter small. As a result of an experiment by the inventor of the present invention, it was found that the optimum mesh size was 2 mm to 3 mm. The shape of the mesh 3 is not limited to the round shape, but may be another shape.

A plurality of rod-shaped ribs 4 are provided in the axial direction on the inner periphery of the reticulated tubular body 1 at appropriate intervals, and the ribs 4 and the surface of the rod-shaped vibrator a come into contact with each other to form a reticulated tubular body. A plurality of axial spaces are formed in the inner peripheral portion of the body 1. In this space, as shown in FIG. 4, bubbles b generated when the rod-shaped vibrator a vibrates.
Are retained inside the reticulated tubular body 1 to prevent the bubbles b from diffusing inside the concrete c.

The fastener 2 for attaching the bubble eliminating device to the vibrating portion of the rod-shaped vibrator a has a ring partially opened and the screw 2a
It consists of a metal band that can be tightened with, and can be easily attached to the vibration part of the rod-shaped vibrator by tightening the upper base end of the mesh cylinder 1 with the fastener 2. There is. If a rod-shaped vibrator having a vibrating portion having the same diameter as the net-like tubular body is used, the bubble eliminating device can be attached without using the fastening tool 2.

[Effect of the device] The bubble eliminating device of the rod-shaped vibrator of the present invention is simply attached to the vibration part of the rod-shaped vibrator for use.
Bubbles generated on the surface of the vibrating portion of the rod-shaped vibrator can be sealed or erased to compact the cast concrete. Further, in the bubble eliminator, since the outer periphery of the rod-shaped vibrator is covered with the net-like cylindrical body, it is possible to avoid the rod-shaped vibrator from directly hitting the concrete formwork surface during use, and the formwork surface is not damaged.

Therefore, even if the concrete is exposed to the finish, the repair work can be reduced and the repair cost can be reduced.
Further, air avatars on the concrete surface and cavities inside the concrete can be reduced, and it is most suitable for placing concrete that emphasizes strength such as super-strength concrete. Further, a skilled worker is not required for the concrete compaction work, and the work time can be shortened.

[Brief description of drawings]

FIG. 1 is a view showing a bubble eliminating device of the present invention, FIG. 2 is a perspective view when the bubble eliminating device is mounted, FIG. 3 is a perspective view of a vibrating part of a rod-shaped vibrator, and FIG. 4 is a bubble eliminating device. FIG. 5 is an explanatory diagram when the device is used, and FIG. 5 is an explanatory diagram of a conventional case where the device is not used. 1; mesh cylinder, 2; fastener 3; mesh, 4; rib a; bar vibrator, b; air bubble

Continuation of the front page (56) References Practical application Microfilm (JP, U) Practical application of the specification and drawings attached to the application for Sho 62-120475 (Actual development Sho 64-26463) A microfilm (JP, U) of the detailed description and drawings attached to the application for Sho 59-143375 (Sho 61-58350)

Claims (3)

[Scope of utility model registration request] 1. A vibrating portion of a rod-shaped vibrator is entirely covered with a mesh cylinder having a plurality of rod-shaped ribs in the axial direction of the inner circumference, and the proximal end of the mesh cylinder is fixed to the vibration portion to raise the vibration. A bubble eliminator for a rod-shaped vibrator, characterized in that an axial space is formed between the vibrating portion and the mesh cylinder. 2. The bubble eliminator for a rod-shaped vibrator according to claim 1, wherein the mesh hole of the mesh cylinder has a hole diameter of 2 mm to 3 mm. 3. A bubble eliminator for a rod-shaped vibrator according to claim 1, wherein the reticulated tubular body is integrally formed of synthetic resin or rubber.