KR101145779B1 - Elastomeric bearing having elastic layer - Google Patents

Abstract

PURPOSE: An elastomeric bearing having an elastic layer is provided to prevent an elastic pad from becoming separated from upper and lower plates even if the horizontal displacement of a structure is increased because the elastic pad has high-viscosity and high-adhesion. CONSTITUTION: An elastomeric bearing having an elastic layer comprises an upper plate(10), a lower plate(20), an elastic pad(30), and an elastic layer(40). The upper and lower plates are fixed to upper and lower structures(U,L) through anchor bolts(11,21). The elastic pad is installed between the upper and lower plates and is composed of a rubber layer(31), one or more reinforcing plates(32), and top and bottom reinforcing plates(34). The reinforcing plates are formed inside the rubber layer. The elastic layer is inserted between the upper plate and the top of the elastic pad or between the lower plate and the bottom of the elastic pad.

Description

Laminated rubber bearing with elastic layer {ELASTOMERIC BEARING HAVING ELASTIC LAYER}

The present invention relates to a laminated rubber bearing used in a bridge, and more particularly, to a laminated rubber bearing for a bridge installed between an upper structure and a lower structure of a bridge.

In general, laminated rubber bearings are installed between upper structures such as bridge decks and lower structures such as bridges that support them to ensure supporting safety with sufficient rigidity vertically while providing sufficient deformation capacity and energy dissipation capacity horizontally. It refers to a device capable of absorbing.

When such laminated rubber bearings are used in bridges, the laminated rubber bearings must have a structure capable of adequately responding to factors that constantly cause relative displacements and loads of the deck and piers. For example, by appropriately preparing for the displacement and load of bridge deck caused by factors such as dynamic loads due to traffic, changes in top plate length due to seasonal and temperature changes, and impact forces due to earthquakes, ultimately the entire or partial collapse of the bridge You can stop.

Laminated rubber bearings are mainly composed of elastic pads which are conventionally laminated with a plurality of rubber plates and steel sheets, and upper and lower plates for installing the elastic pads in a bridge structure.

However, as shown in FIG. 1, the conventional laminated rubber bearing has an upper structure U because the elastic pad 3 is placed in a simple contact state without being completely fixed to the upper plate 1 and the lower plate 2. As the displacement caused by the horizontal load of the upper plate 1 fixed thereto increases, tensile stress is generated at one lower end of the elastic pad 3 and the other upper end in the diagonal direction, causing the roll-over phenomenon in which this part is lifted. Due to this, problems such as slip phenomenon and bridge damage due to detachment of the elastic pad due to the reduction of the ground area are generated.

In order to solve this problem, conventionally, the elastic pad 3 and the upper and lower plates 2 are tabbed and fastened with bolts to interconnect the elastic pads and the upper and lower plates 1 and 2, or the elastic pads. (3) and the upper and lower plates (1, 2), but additionally installed a slip preventing stopper, but in this case there is a problem that the construction of the laminated rubber bearing is complicated, the cost increases.

The present invention is to solve the above problems, the object of the present invention is the construction and manufacturing process is simple, even if the horizontal displacement of the structure increases the roll-over and slip phenomenon between the elastic pad and the upper and lower plates It is to provide a laminated rubber support that can effectively suppress the.

The present invention for achieving the above object, the upper plate and the lower plate fixed to each of the upper structure and the lower structure of the bridge; Installed between the upper plate and the lower plate, the rubber layer, at least one reinforcing plate formed in the rubber layer, and the upper and lower reinforcing plate of the metal material is located on the top and bottom of the rubber layer exposed to the outside An elastic pad configured; Interposed between the upper plate and the upper reinforcement plate of the elastic pad, or between the lower plate and the lower reinforcement plate of the elastic pad, the elastic pad and the upper plate or the elastic made of a composition having a viscosity and adhesion of 7000 cps or more An elastic layer that provides a bonding force so that the pad and the lower plate are integral with each other without slipping, and the elastic layer is 85-94% of methyl methacrylate (MMA) as a main material and benzoyl perlock as a curing agent. Side layer (benzoyl peroxide) and epoxy resin and butyl benzyl (Butyl Benzyl) provides a laminated rubber bearing, characterized in that consisting of a mixed composition.

According to the present invention, the upper plate and the lower plate by the upper and lower elastic layers having high viscosity and high elongation are coupled to the upper and lower reinforcing plates of the elastic pad, respectively, with high elongation and elasticity, the upper structure and the lower Even if the elastic pad is deformed due to the displacement due to the horizontal load acting between the structures, the rollover phenomenon and the slip phenomenon in which the upper and lower ends of the elastic pad are separated from the upper and lower plates can be effectively prevented.

1 is a longitudinal sectional view showing a state in which a horizontal displacement occurs in the laminated rubber bearing according to the prior art.
2 is a longitudinal cross-sectional view of the laminated rubber support according to an embodiment of the present invention.
3 is a longitudinal sectional view showing a state in which a horizontal displacement occurs in the laminated rubber support of FIG.
4 is a longitudinal sectional view of a laminated rubber support according to another embodiment of the present invention.
Figure 5 is an enlarged longitudinal sectional view showing a portion of the laminated rubber support according to another embodiment of the present invention.
Figure 6 is a longitudinal sectional view showing a part of the laminated rubber bearing according to another embodiment of the present invention.
Figure 7 is a photograph showing the laminated rubber bearing separately in accordance with the present invention.
8A to 8D are shear deformation test photographs of the laminated rubber bearing according to the present invention, and show when the rubber layers are 70%, 100%, 150%, and 200% of the thickness, respectively.
9 is a tensile shear bond strength test report at room temperature for the laminated rubber bearing according to the present invention.
10 is a tensile shear bond strength test report at low temperature for the laminated rubber bearing according to the present invention.

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

First, Figures 2 to 3 show the first embodiment of the laminated rubber bearing according to the present invention, the laminated rubber bearing of this embodiment is anchor bolt 11, respectively in the upper structure (U) and the lower structure (L) of the bridge 21, the upper plate 10 and the lower plate 20 fixed by the fastening means, the elastic pad 30 is installed between the upper plate 10 and the lower plate 20, and the upper plate ( 10) a high viscosity elastic layer 40 interposed between the upper surface of the elastic pad 30, and a high viscosity elastic layer 40 interposed between the lower plate 20 and the lower surface of the elastic pad 30. It consists of a configuration including.

The elastic pad 30 includes a rubber layer 31 that provides an elastic force, and a plurality of reinforcing plates 32 made of a metal material formed of steel sheets stacked at regular intervals in the rubber layer 31, and the rubber layer 31. The top and bottom of each of the upper reinforcing plate 33 and the lower reinforcing plate 34 of the metal material is disposed. That is, the elastic pad 30 is made of a rubber layer 31, at least one reinforcing plate 32, the upper reinforcing plate 33 and the lower reinforcing plate 34, it is formed as a structure through a vulcanization process. Therefore, the elastic pad 30 has a structure in which steel materials, which are the upper reinforcing plate 33 and the lower reinforcing plate 34, are exposed to the outside, and the upper reinforcing plate 33 and the lower part are formed by the elastic layer 40. The reinforcement plate 34 forms an integral structure with the upper plate 10 and the lower plate 20.

In this embodiment, the upper reinforcing plate 33 and the lower reinforcing plate 34 is the same as the thickness of the reinforcing plate 32, but may alternatively have a larger thickness than the reinforcing plate (32). The upper reinforcing plate 33 and the lower reinforcing plate 34 are coupled to the upper plate 10 and the lower plate 20 in a non-slip state by the elastic layer 40, respectively.

In addition, as shown in another embodiment in Figure 4, the upper reinforcing plate 33 and / or the lower reinforcing plate 34 is preferably formed so that the end is bent into the rubber layer (31). The bent end may be formed at two opposite edge portions or at all four edges. Therefore, the bending area of the upper reinforcing plate 33 and / or the lower reinforcing plate 34 increases the adhesive area with the rubber layer 31, so that the edge portion of the elastic pad 30 is sheared. It is possible to more effectively prevent the rubber peeling phenomenon. The bent portion of the upper reinforcing plate 33 and / or the lower reinforcing plate 34 is preferably maintained at an angle of 90 degrees for adhesion to the rubber layer 31.

The elastic layer 40 is made of 85 to 94% of methyl methacrylate (MMA) as a main material, benzoyl peroxide, epoxy resin and butyl benzyl as a curing agent. It has high viscosity and high adhesive strength of about 7000 cps or more, preferably 8000 cps or more, excellent cold resistance that can withstand about 50 ° C. after curing, and excellent heat resistance and high elongation to withstand high temperatures of 177 ° C. That is, since the bridge in which the laminated rubber bearing is installed is placed in a very low and high temperature environment in winter and summer, the elastic layer 40 forming the composition must have strong temperature resistance. When the main composition of the composition is outside the 85 to 94% range, the viscosity is lower than 7000 cps, the adhesive strength is lowered, the bonding force between the upper and lower reinforcing plates (33, 34) and the upper and lower plates (10, 20) Lack of this makes all behavior difficult. In addition, the main mixing ratio of the elastic layer 40 composition is preferably 90 to 92%.

In addition, the elastic layer 40 is applied between the upper reinforcing plate 33 of the upper plate 10 and the elastic pad 30, the lower plate 20 and the lower reinforcing plate 34 of the elastic pad 30. After curing at room temperature curing method. In addition, the elastic layer 40 is made of a gravity curing method. That is, the elastic layer 40 formed by the application of the composition has a bonding force by being cured in a state in which no external pressure is applied, that is, natural gravity. Therefore, after the curing time has elapsed, the upper and lower plates 10 and 20 and the elastic pad 30 are integrated.

The elastic layer 40 is preferably applied to a thickness of approximately 200㎛ or more. When the thickness of the elastic layer 40 is smaller than 200 μm, the elastic layer 40 may be damaged due to a strong impact at a low temperature or when a sudden horizontal displacement is applied, thereby preventing its function.

The upper plate 10 and the lower plate 20 are coupled to the upper reinforcing plate 33 and the lower reinforcing plate 34 of the elastic pad 30 by high elasticity and elasticity, respectively, by the elastic layer 40. Accordingly, as shown in FIG. 3, even when the elastic pad 30 is deformed due to the displacement caused by the horizontal load between the upper structure U and the lower structure L, the upper and lower end portions of the elastic pad 30 are The rollover phenomenon and the slip phenomenon lifted apart from the upper and lower plates 10 and 20 are suppressed.

The elastic layer 40 may be formed only in an area corresponding to the upper reinforcing plate 33 and the lower reinforcing plate 34, or alternatively, may be formed over the entire upper and lower surfaces of the elastic pad 30.

Figure 5 shows another embodiment of the laminated rubber bearing according to the present invention, the laminated rubber bearing of this embodiment is a groove (with a predetermined depth in the upper reinforcing plate 33 and the lower reinforcing plate 34 of the elastic pad 30) 35 is formed, it is preferable that the elastic layer 40 is formed thicker than the depth of the groove 35 inside the groove 35 so that the elastic layer 40 protrudes out of the groove 35.

As such, when the groove 35 is formed in the upper reinforcing plate 33 and the lower reinforcing plate 34, and the elastic layer 40 is formed inside the groove 35, the increase in the thickness of the entire laminated rubber base is minimized. While it is possible to increase the thickness of the elastic layer 40, it is possible to obtain the advantage that the end of the elastic layer 40 is caught by the end of the groove 35 to increase the resistance to horizontal displacement. In addition, it has the effect of reducing the overall thickness of the upper and lower reinforcing plate (33, 34) to reduce the material cost.

In this embodiment, the groove 35 may be formed on the upper and lower reinforcing plates 33 and 34 singly, but a plurality of grooves may be formed at regular intervals as shown in FIG. 6. In this case, the ribs 36 between the grooves 35 function as reinforcing bars to increase the overall strength of the upper and lower reinforcing plates 33 and 34.

As a result of the following test in order to confirm the adhesive bonding strength of the composition forming the elastic layer 40, the viscosity and the adhesive bonding strength of the elastic layer 40 depends on the mixing ratio of the main composition and the curing agent constituting the composition. It could be known.

Ratio (weight ratio) Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 subject 85 90 92 94 81 83 95 Hardener 15 10 8 6 9 7 5

(1) shear deformation test

When performing the shear deformation test, the size of the elastic pad 30 is 300mm, 400mm and 100mm in the horizontal, vertical and thickness, respectively, the elastic layer 40 is a thickness of 200㎛, the upper plate 10 And the sizes of the lower plates 40 were 400 mm, 500 mm and 38 mm, respectively.

First, 720 kN was applied as a vertical load, and then the shear deformation of the elastic pad 30 was tested to be 70%, 100%, 150%, and 200% of the thickness of the rubber layer 31, and then visual inspection was performed. 8a to 8d are photographs showing the results of this shear deformation test.

(2) Tensile shear bond strength test

The fabrication and testing of the test piece were carried out according to KS M 3734. After washing both sides of the adhesive with IPA, the composition was evenly applied (the adhesive area was 25mm × 25mm, and left for 24 hours after clamping. The test was carried out in the same and at low temperatures, and then the result was confirmed.

(3) impact test

The test piece was prepared with reference to KS M 3734, and the weight (5.24 kg) was dropped and tested at a height of 0.5m and 1.3m, and the test piece was tested at room temperature and low temperature, respectively. Visual inspection was performed after the test.

The results for the test are as follows.

Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Comparative Example 3 Shear deformation test 70% Good Good Good Good Good Good Ripped 100% Good Good Good Good Side peeling Fine peeling Ripped 150% Good Good Good Good Side peeling Fine peeling Ripped 200% Peeling Good Good Good Ripped Ripped stop Tensile Shear Adhesion Strength
(At room temperature, N / cm ² ) 1335 1405 1170 1408 890 956 856 Tensile Shear Adhesion Strength
(Low temperature, N / cm2) 1591 1460 1652 1884 968 900 986 Shock
exam
(Room temperature) 0.5m Good Good Good Good Adhesive Crack Good Good 1.3 m Good Good Good Good Adhesive Crack Test piece separation Test piece separation Shock
exam
(-20) 0.5m Good Good Good Good Adhesive Crab Good Adhesive Crab 1.3 m Adhesive Crack Good Good Good Adhesive Crack Test piece separation Test piece separation

In addition, as can be seen from the shear deformation test picture of the laminated rubber support of the present invention shown in Figure 8a to 8d and the test report of Figures 9 and 10, the laminated rubber bearing of the present invention is the high viscosity and high By the elastic layer 40 having an adhesive force (see FIG. 2), the rollover phenomenon and the slip phenomenon that the upper and lower end portions of the elastic pad 30 (see FIG. 2) are separated from the upper and lower plates do not occur.

Embodiments of the above-described laminated rubber bearing according to the present invention are presented for the purpose of illustration only to help understanding of the present invention, and the present invention is not limited thereto, and it is attached to those skilled in the art to which the present invention pertains. Various changes and implementations may be made within the scope of the technical idea described in the claims.

10: upper plate 20: lower plate
30: elastic pad 31: rubber layer
32: reinforcement plate 33: upper reinforcement plate
34: lower reinforcing plate 35: groove
36: rib 40: elastic layer
U: Upper Structure L: Lower Structure

Claims (6)

An upper plate 10 and a lower plate 20 fixed to each of the upper structure U and the lower structure L of the bridge;
It is installed between the upper plate 10 and the lower plate 20, the rubber layer 31, at least one reinforcing plate 32 formed in the rubber layer 31, and the top and bottom surfaces of the rubber layer 31 An elastic pad 30 formed of an upper reinforcing plate 33 and a lower reinforcing plate 34 made of a metal material exposed to the outside;
It is interposed between the upper plate 10 and the upper reinforcing plate 33 of the elastic pad 30, or between the lower plate 20 and the lower reinforcing plate 34 of the elastic pad 30, 7000cps or more An elastic layer made of a composition having a viscosity and adhesive force to provide a bonding force so that the elastic pad 30 and the upper plate 10 or the elastic pad 30 and the lower plate 20 are integrated with each other without slipping ( 40),
The elastic layer 40 is composed of 85 to 94% methyl methacrylate (MMA: methyl methacrylate) as a main ingredient, benzoyl peroxide (benzoyl peroxide), epoxy resin and butyl benzyl (Butyl Benzyl) as a curing agent Laminated rubber bearing, characterized in that made. The laminated rubber support according to claim 1, wherein the upper reinforcing plate (33) and the lower reinforcing plate (34) have the same thickness as the reinforcing plate (32). The laminated rubber support according to claim 1, wherein the upper reinforcing plate (33) or the lower reinforcing plate (34) is formed so that its ends are bent. The laminated rubber bearing according to any one of claims 1 to 3, wherein the elastic layer (40) is formed to a thickness of 200 µm or more. The groove 35 is formed in any one of the upper reinforcement plate 33 or the lower reinforcement plate 34, and the elastic layer 40 is the groove. (35) Laminated rubber support, characterized in that formed in the inner thickness of the groove 35 or more. The laminated rubber bearing according to any one of claims 1 to 3, wherein the elastic layer (40) is formed over the entire area of the top or bottom surface of the elastic pad (30).

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