JPH10184084A - Vibration-isolating structure and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the absorbing power of vibrational energy by piling high- strength spheres on the inside of a high-strength restrainig cylinder at a plurality of stages. SOLUTION: Ring-shaped ribs 2 are juxtaposed onto the external wall of a steel pipe 1, and a restraining cylinder 11 is constituted. The inside of the cylinder 11 is filled with steel balls 3 and steel balls 4. When the cylinder 11 is pressed by strong force from the direction of the arrow 8, each steel ball 3, 4 is rolled (or slid) in any directions as shown in the arrow 9, the arrow 10, etc., respectively, and energy is consumed by friction on contact surfaces. Consequently, vibrational energy given from a foundation is damped quickly and transmitted to a concrete pole 6, and both amplitude and strength are damped and transmitted to a building. Since the apparent bulk of the steel balls 3, 4 is kept approximately constant by the deformation of the restraint cylinder 11 and the abutting surfaces of each steel ball 3, 4 are only deformed elastically, an external shape is restored when external force such as vibrations is removed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seismic isolation structure and a method of manufacturing the same to increase vibration energy absorption capacity and withstand pressure.

[0002]

2. Description of the Related Art Conventionally, there has been known an invention in which a steel ball is interposed between a lower portion of a building frame and a foundation so as not to apply ground vibration to the frame (Japanese Patent Publication No. Hei 7-13371). In addition, a proposal has been made for an architectural seismic absorption foundation in which lubricating oil and steel balls are put into a U-shaped steel plate on a foundation concrete, a steel plate is put on the steel plate, and a floor plate on the building side is put on the steel plate. (Japanese Utility Model Application Laid-Open No. 56-130045).

[0003]

The known invention uses a steel ball as a bearing for horizontal movement, and cannot absorb vibration energy between a foundation and a building during an earthquake or the like. There was a problem.

[0004] In addition, the above-described known device absorbs vibration energy because the vibration is absorbed by the presence of lubricating oil. For example, withstand pressure when horizontal vibration occurs,
It is thought that it was required to be easily deformed.

[0005]

According to the present invention, high-strength balls are stacked in a plurality of stages inside a high-strength restraining cylinder and restrained on the outer peripheral side. Vibration energy can be effectively absorbed.

That is, the invention of the article is a seismic isolation structure characterized in that a high-strength sphere is filled in a plurality of stages inside a high-strength restraining cylinder. The high-strength restraint cylinder has an annular rib installed in parallel on the outer wall of the cylinder, or a helical streak installed on the outer wall of the cylinder, or a high-strength reinforcement wire is installed on the outer wall of the cylinder in order to improve the pressure resistance in the circumferential direction. It is characterized by being installed, the high strength sphere,
Special steel with a diameter of 5mm to 10mm, characterized in that it is a steel ball made of alloy in which nickel, tungsten, molybdenum, vanadium, cobalt, aluminum, titanium, etc. are added alone or in combination with carbon steel to 2-3%. Things.

Next, a method invention is characterized in that a bottom plate is provided at the bottom of the high-strength restraint cylinder, and high-strength spheres are mixed into the high-strength restraint cylinder in large and small sizes to terminate at a plurality of stages. Wherein the high-strength spheres are single spheres of the same size or mixed spheres of a plurality of sizes. Further, the high-strength restraining cylinder is characterized in that a reinforcing steel bar, a metal net, or a synthetic resin net is provided around the outer wall of the steel pipe. Are fixed in parallel.

The material of the restraining cylinder may be a fiber reinforced plastic pipe in addition to the steel pipe.

In the present invention, a relatively large diameter steel ball (for example, 50 mm to 100 mm) is used for a relatively large diameter restraining cylinder (for example, 50 cm to 100 cm). Likely diameter 5
mm ~ 50mm and 50mm ~ 100mm mixed (50%
Position).

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention fills a high-strength sphere in a plurality of stages inside a high-strength restraint cylinder,
Due to the deformation of the high-strength restraint cylinder, the high-strength spheres slide with each other, causing rolling and the like. Accordingly, the invention relates to a seismic isolation structure that absorbs vibration energy and a method of manufacturing the same.

The high-strength restraining cylinder includes a reinforced steel pipe or a fiber-reinforced plastic pipe.

[0012]

Embodiment 1 An annular rib 2 is juxtaposed on the outer wall of a steel pipe 1 to form a restraining cylinder 11, and a steel ball 3 having a diameter of about 30 mm is provided inside the restraining cylinder 11 at 50% (weight) and a diameter of 80 mm. 5 steel balls 4
It is filled with 0% (weight). In the figure, 5 is a foundation concrete, 6 is a concrete column, and 7 is a bottom plate.

In the above-described embodiment, when the restraining cylinder 11 is inclined in the same direction when a strong pressure is applied from the direction of arrow 8, the steel balls 3, 4 are moved in the directions of arrows 9, 10, respectively. Rolls (or slips) and consumes energy due to friction at the contact surface. Therefore, the vibration energy given from the foundation is rapidly attenuated and transmitted to the column 6, and the amplitude and the intensity are reduced and transmitted to the building.

The apparent bulk of the steel balls 3, 4 is substantially constant due to the deformation of the restraining cylinder 11 described above, and each steel ball 3, 4
Since the contact surface 4 only deforms elastically, the external shape is restored if there is no external force such as vibration.

It is also conceivable to provide a surface hardened layer (provided by laminating a special steel plate, quenching, etc.) on the inner cylinder wall of the restraining cylinder 11 in the above.

[0016]

Embodiment 2 FIG. 2 shows an embodiment of a fiber-reinforced restraining cylinder.
That is, the annular flange 13 is provided outside the upper end of the steel pipe 12, and
The carbon fiber is densely wound around the entire outer periphery of the steel pipe 12 from the lower portion of the annular flange 13 to provide a carbon fiber layer 14.

According to the above embodiment, the steel pipe 12 has sufficient strength even if the wall thickness is relatively thin.

Instead of the carbon fiber, a glass fiber 16 or a glass fiber net is formed into a cylindrical shape, and this is impregnated with a polyester resin 17 to form a restraining tube 15. This restraint tube has water resistance, chemical resistance, and corrosion resistance.

[0019]

According to the present invention, since the high-strength sphere filled in the restraining cylinder absorbs vibration energy and has sufficient pressure resistance, it is highly reliable as a seismic isolation structure, and has a wide base and a wide base. There is an effect that the characteristics can be exhibited by interposing between the building and the building.

[Brief description of the drawings]

FIG. 1 is a sectional view of a structure according to an embodiment of the present invention in use.

FIG. 2 is a sectional view of an embodiment of the high-strength restraint cylinder.

FIG. 3 is a sectional view of an embodiment of a high-strength restraint cylinder also made of a fiber-reinforced synthetic resin.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 steel pipe 2 annular rib 3, 4 steel ball 5 base concrete 6 concrete column 7 bottom plate 11, 15 restraining cylinder 12 steel pipe 13 annular flange 14 carbon fiber layer 16 glass fiber 17 polyester resin

Claims (7)

[Claims] 1. A seismic isolation structure characterized in that a high-strength sphere is filled in a plurality of stages inside a high-strength restraint cylinder. 2. A high-strength restraining cylinder is provided with an annular rib on the outer wall of the cylinder, a helical bar on the outer wall of the cylinder, or a high-strength reinforcement on the outer wall of the cylinder in order to improve the pressure resistance in the circumferential direction. The seismic isolation structure according to claim 1, wherein the wire is provided around the wire. 3. The high-strength sphere is a special steel having a diameter of 5 mm to 10 mm, and nickel, tungsten, molybdenum,
The seismic isolation structure according to claim 1, wherein vanadium, cobalt, aluminum, titanium, or the like is used alone or in combination to form an alloy steel ball to which 2 to 3% is added. 4. A method of manufacturing a seismic isolation structure, comprising: providing a bottom plate at the bottom of a high-strength restraint cylinder; mixing high-strength spheres into the high-strength restraint cylinder; 5. The method for manufacturing a seismic isolation structure according to claim 4, wherein the high-strength sphere is a single sphere of the same size or a mixed sphere of a plurality of sizes. 6. The method for manufacturing a seismic isolation structure according to claim 4, wherein the high-strength restraining cylinder has a reinforcing bar, a metal net, or a synthetic resin net surrounding the steel pipe on its outer wall. 7. The method for manufacturing a seismic isolation structure according to claim 4, wherein the high-strength restraining cylinder has a steel ring fixed in parallel to an outer wall of a steel pipe.