KR20120110764A - Elastomeric rubber bearing - Google Patents

Abstract

PURPOSE: An elastomeric rubber bearing is provided to improve the durability by laminating a reinforcement plate and increase adhesive property and vertical weight load between a rubber plate and the reinforcement plate. CONSTITUTION: An elastomeric rubber bearing(120) comprises a rubber plate(121), a reinforcement plate, and an embossing concave-convex portion. The rubber plate and a reinforcement plate are laminated alternately. The reinforcement plate is composed of one of a metal plate, a carbon mat, glass fiber reinforced plastic, or carbon fiber reinforced plastic. The embossing concave-convex portion is composed of a groove portion and a projection portion and formed on the contact surface of the rubber plate and the reinforcement plate. The boundary portion of a groove portion and the projection portion of the embossing concave-convex portion is rounded.

Description

Elastomeric Rubber Bearing}

The present invention relates to an elastic bearing, and more particularly, to an elastic bearing for preventing seismic waves from being transmitted from the ground to the structure.

In general, all structures on the earth (nuclear power plants, petrochemical plants, bridges, tunnels, apartments, multi-unit houses) are generally designed to withstand vertical loads such as global gravity, but they are designed to withstand horizontal loads such as typhoons and earthquakes. Many are vulnerable. As society develops and the economy grows, earthquake damage of important structures such as nuclear power plants and large structures such as skyscrapers and bridges is accompanied by enormous casualties and property damage, so that earthquake-resistant design is inevitable. It became. Increasingly, in the environment where large cities are developed and various structures and general structures coexist with the concentration of the population, defense measures are required against natural disasters such as earthquakes.

When explaining the seismic design of earthquake preparedness for earthquake, Earthquake Resistance is the concept of constructing a very strong structure and when the earthquake occurs and the earthquake force acts on the structure, it will stand up against the earthquake force and bear the structure. That is, the seismic force acting on the structure is intended to counter the seismic force by increasing the member force such as the strength and toughness of the member, and the seismic isolation is a passive but fairly economical and seismic margin to avoid the earthquake. It can be defined as an active concept that tries to overcome the damage of the earthquake.

Earthquake resistant design means that the structure is designed to be safe against earthquakes that are likely to occur in the future. Earthquake proof design, which prevents the structure from being damaged in the event of an earthquake, is virtually impossible. Consider seismic design to withstand The principle of seismic design is to design the structure so that the structure and the foundation ground are not separated from each other when the seismic wave is delivered. For this purpose, for example, by reinforcing steel aggregate on the column and thickening the wall concrete, the design method is applied to the impact. If is to reinforce the pillars and walls of the structure to sustain the impact, the seismic design prevents the seismic waves from affecting the structure by separating the structure and the ground from each other, but it is impossible to completely separate the ground and the structure. In order to prevent the transfer from the ground to the structure as much as possible the idea of inserting the cushioning material between the two, as a cushioning material is usually used a high elastic rubber, various cushioning materials have been used recently.

However, the elastic support of the cushioning material that has been used conventionally, since the rubber pad portion and each of the upper and lower plate members are installed in a state separated from each other, the shear deformation continuously occurs during the continuous movement of the bridge, and eventually the rubber pad slippage occurs. I had a problem that would occur. This sliding phenomenon is more prominent in the long bridge with a large amount of movement, and occurs even before the upper vertical load is completely loaded. Thus, the rubber pads deviate from their intended positions in the design, and thus, there is a problem that it is difficult to exhibit sufficient seismic capacity during an earthquake.

An object of the present invention devised to solve the problems of the prior art is to reinforce the rigidity against the vertical load by stacking the reinforcement plate between the rubber plate, while the round (R) to expand the ground area between the rubber plate and the reinforcement plate (R) ) By forming embossed concave-convex part, the adhesion between rubber plate and reinforcement plate and the rigidity against horizontal load are improved, and the elastic modulus of elastic support is improved, so that due to typhoon in structure or earthquake caused by earthquake in foundation ground It is to provide an elastic support to effectively block the generated vibration is transmitted to the structure.

The elastic support for achieving the object of the present invention is characterized in that the rubber plate and the reinforcement plate to be laminated alternately, the embossed convex portion is formed on the ground surface of the rubber plate and the reinforcement plate.

Here, the reinforcing plate may be manufactured using any one of a metal plate, carbon mat, glass fiber reinforced plastic, carbon fiber reinforced plastic.

And, the embossed concave-convex portion is characterized in that the grooves and protrusions formed in the reinforcement plate and the rubber plate.

In addition, the embossed concave-convex portion is characterized in that the boundary between the groove portion and the periphery and the flat surface is formed in a round (R).

The present invention according to the above configuration by reinforcing plate between the rubber plate to reinforce the rigidity to the vertical load, while forming an embossed concave-convex portion formed with a round (R) for expanding the ground area between the rubber plate and the reinforcing plate, The adhesion between the rubber plate and the reinforcement plate and the rigidity against the horizontal load are improved, and the elastic modulus of the elastic bearing is improved so that the vibration generated from the earthquake caused by the earthquake on the foundation ground or the typhoon from the structure is transmitted to the structure. By effectively blocking, there is an effect of improving the durability of the structure, and has the effect of providing a safe installation environment.

1 is a perspective view showing an elastic support according to an embodiment of the present invention.
Figure 2 is a plan view showing an elastic support according to an embodiment of the present invention.
3 is a sectional view taken along the line AA in Fig.
4 is a detail view of the portion “A” of FIG. 3.
5 is a perspective view of the reinforcing plate applied to the elastic support according to an embodiment of the present invention.
6 is a perspective view showing a modification of the elastic support according to an embodiment of the present invention.
Figure 7 is a schematic cross-sectional view showing the construction structure of the elastic support according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing an elastic support according to an embodiment of the present invention.

Referring to Figure 1, the elastic support 120 according to an embodiment of the present invention, the outer surface is manufactured in the form of a block wrapped by a rubber material.

2 is a plan view showing an elastic support according to an embodiment of the present invention. Referring to FIG. 2, the reinforcing plate 125 as shown by the hidden line inside the elastic bearing 120 is interpolated. The reinforcing plate 125 forms a myriad of embossed uneven portions 127 on its surface.

The internal structure of the elastic support 120 will be described in more detail with reference to FIGS. 3 and 4 as follows.

3 is a sectional view taken along the line A-A in Fig. Referring to FIG. 3, a plurality of rubber plates 121 and reinforcing plates 125 are alternately stacked, and in particular, the inner and outer surfaces of the reinforcing plates 125 are all covered by the rubber plates 121. In addition, by smoothly rounding the end edge (r ') of the reinforcing plate 125, due to the end edge (r') of the reinforcing plate 125 at the external impact or intense pressing of the elastic support 120 121) is to prevent tearing.

That is, the elastic support plate 120 according to the embodiment of the present invention is a structure in which the reinforcing plate 125 is not exposed to the outside, the appearance is concise, and the moisture does not penetrate.

5 is a perspective view of a reinforcing plate applied to the elastic support according to an embodiment of the present invention.

Referring to Figure 5, the reinforcing plate 125 is to provide the structural strength to the elastic support 120, a metal plate, carbon mat, glass fiber reinforced plastic (GFRP: Glass Fiber Reinforced Plastic), carbon fiber reinforced plastic (CFRP) Carbon Fiber Reinforced Plastic).

In particular, carbon mat, glass fiber reinforced plastic, carbon fiber reinforced plastic can be used. Such carbon mat, glass fiber reinforced plastic, carbon fiber reinforced plastic is light, acid resistance, durability, impact resistance, wear resistance, and no corrosion. It has the advantage of being high strength, not deformed by heat, and easy to process.

At this time, the embossed concave-convex portion in which the ground surface of the rubber plate 121 and the reinforcing plate 125 is rounded as shown in FIG. 4 in a manner to widen the ground area of the rubber plate 121 and the reinforcing plate 125 ( 127).

4 is a detailed view of the portion “A” of FIG. 3. Referring to FIG. 4, the embossed concave-convex portion 127 in which the round R is formed may be either a groove or a protrusion, and the groove and the protrusion may be alternately repeatedly formed.

The embossed convex portion 127 is manufactured in a form in which the rubber plate 121 and the reinforcement plate 125 coincide with each other. That is, when the groove is formed in the reinforcing plate 125, the protrusion is formed in the rubber plate 121 corresponding thereto.

When the embossed convex portion 121 is formed between the rubber plate 121 and the reinforcing plate 125 as described above, the ground area is greatly increased, and the rigidity against the vertical load is reinforced as the ground area is increased.

At this time, the cross-sectional area of the embossed uneven portion 121 can be arranged in the following manner.

When the embossed convex-concave portion 121 is a hemispherical groove, the diameter of the hemisphere is a, and when the depth is a / 2, the cross-sectional area of the groove can be expressed by the following equation (1).

...........(식1)

........... (Equation 1)

As such, when the ground area is widened, the elastic modulus of the elastic support 120 may be increased to improve vibration absorption and restoring force.

Here, in order to increase the ground area, a boundary between the groove and the periphery of the embossed convex and convex portion 121 and the flat surface may be formed in a round (R).

At this time, the cross-sectional area of the round (R) can be represented by the following equation (2).

.........(식2)

......... (Equation 2)

That is, the cross-sectional area of the embossed uneven portion 121 in which the round R is formed may be summarized by the following Equation 3.

.........(식3)

......... (Eq. 3)

Since the rubber plate 121 installed in the present invention is an ideal incompressible material having a Poisson's ratio close to 0.5, similar to water, the amount of expansion of the elastic bearing is the rigidity of the rubber plate 121 used and the rubber plate 121 used. The thickness is dominantly affected.

In addition, the apparent amount of swelling varies considerably depending on the thickness of the coated rubber used.

Poisson's ratio refers to the ratio of compressive strain to compressive load and tensile strain in the lateral direction.However, the Poisson's ratio of 0.5 means that a volume equal to the volume reduction corresponding to the compressive strain caused by the vertical load protrudes in the horizontal direction. It is called an incompressible material.

In other words, rubber is an object with a Poisson's ratio of 0.5 equal to the apparent volume compressed by the compressive load and the actual volume expanding horizontally.

Cork, on the other hand, is an object with zero porosity ratio with no horizontal projection because the void inside the object absorbs the compressive strain due to vertical load. It is an object.

Looking at the functional relationship between the vertical elastic modulus and the cross-sectional area of the elastic support 120 through the following experimental example.

Calculation of vertical modulus of elasticity (e.g. 135 tons square)

Specifications of the base: 300 mm (short side) × 400 mm (long side) × 105 mm (height), thickness of one rubber layer: 12 mm, thickness of one steel sheet: 4 mm, total number of rubber layers: 6 layers, top and bottom coating thickness: 2.5 mm, side cover thickness : 4mm, height of elastic base: 12mm × 6ea + 4mm × (6 + 1) ea + 2.5mm × 2ea = 105mm

The vertical elastic modulus Kv of the elastic support 120 is a function of the elastic modulus (E) and the cross-sectional area (A) of the rubber and the pure rubber thickness (∑te) as shown in Equation 1 below, and can be evaluated by the following equation. have.

Equation 1 ......... Kv = E × A / ∑te = 2,962 kg / cm2 × (39.2cm × 29.2cm) /7.2cm = 470,989 kg / cm

here,

E: (3 + 6.58S2) × G = (3 + 658 × 6.972) × 9.18 = 2,962 kg / cm2,

G: Shear modulus of rubber (G = 9.18kg / cm2)

S (shape coefficient): a × b / [2 (a + b) × te] = 29.2 × 39.2 / [2 (29.2 + 39.2) × 1.2] = 6.97

∑te: Total thickness of pure rubber (excluding top and bottom cover thickness) = 7.2cm

6 is a perspective view showing a modified example of the elastic bearing according to the embodiment of the present invention. Referring to Figure 6, the outer shape of the elastic bearing 120 according to an embodiment of the present invention can be produced in the form of a circular block. As described above, the elastic support 120 has a feature that can be deformed in any number of forms in addition to the appearance of a rectangular block or a circular block.

Figure 7 is a schematic cross-sectional view showing the construction structure of the elastic support according to an embodiment of the present invention.

Referring to FIG. 7, an elastic support plate 120 is installed on the concrete slab layer 111, and a finishing layer 113 is installed on the elastic support plate 120.

At this time, the elastic support plate 120 may be installed so that a plurality of uniformly disposed on the concrete slab layer 111, a separate bonding process may be performed to prevent the flow in the installation process. Bonding process may be to be bonded to the elastic base plate 120 on the concrete slab layer 111, or to the bottom of the finishing layer 113.

As described above, the elastic support according to the embodiment of the present invention reinforces the rigidity against the vertical load by stacking the reinforcement plate 125 between the rubber plates 121, while the rubber plate 121 and the reinforcement plate 125 By forming the embossed concave-convex portion 127 in which the round R is formed to expand the ground area therebetween, the rigidity against the adhesive force and the horizontal load between the rubber plate 121 and the reinforcing plate 125 is improved and the elastic support ( By improving the modulus of elasticity of 120), it effectively blocks the transmission of vibration generated by earthquakes or earthquakes caused by earthquakes in the foundation to the structure, thereby improving the durability of the structure as well as providing a safe facility environment. It can be provided.

111: concrete slab layer
113: finishing layer
120: elastic bearing
121: rubber plate
125: gusset
127: embossed irregularities
129: bolt fastener
130: fastening bolt

Claims (4)

The rubber plate 121 and the reinforcement plate 125 to be alternately stacked, the elastic support, characterized in that the embossed convex portion 127 is formed on the ground surface of the rubber plate 121 and the reinforcement plate (125).
The method of claim 1,
The reinforcing plate 125 is rounded at the end edge r ′, and any one of a metal plate, a carbon mat, a glass fiber reinforced plastic (GFRP), and a carbon fiber reinforced plastic (CFRP) Elastic stand, characterized in that made using one.
The method of claim 1,
The embossed concave-convex portion 127 is an elastic support, characterized in that the groove portion and the protrusion formed in the reinforcement plate 125 and the rubber plate 121.
The method of claim 3,
The embossed concave-convex portion 127 is an elastic bearing, characterized in that the boundary between the groove portion and the protrusion and the flat surface is formed in a round (R).

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