KR200170129Y1 - A elastomeric bearing which is connected movement restriction device by plate spring - Google Patents

Abstract

The present invention relates to an elastic bearing with a leaf spring type movement limiting device. More specifically, in the conventional elastic bearing, the shear deformation of the rubber is suppressed against the braking load and the wind load of the vehicle, thereby acting as a fixed end and a one-way fixed end. The present invention relates to an elastic bearing having improved fixing wedges, wherein both sides or four sides of the pad (1) are provided between the upper plate (2) and the lower plate (3) and the upper and lower plates (2, 3). Plate springs 4 installed on the upper and lower plates 2 and 3 spaced apart from each other, and fastening bolts connecting the upper and lower plates 2 and 3 so that the leaf springs 4 can be easily detached from the outside. (5) It is characterized by the fact that it is easy to manufacture to any size, and to loosen the fastening bolt 5, the replacement of the pad (1) is easy, and also the horizontal to the longitudinal direction (X direction) of the leaf spring Fully restrains displacement The right angle has a may allow the horizontal displacement, yet does not inhibit the basic function of the resilient support should allow rotation for every direction of effect on (Y direction).

Description

A elastomeric bearing which is connected movement restriction device by plate spring}

The present invention relates to an elastic bearing with a leaf spring type movement limiting device installed on the top of a bridge to accommodate the load and deformation of the bridge deck, and more specifically, to the braking load and the wind load of the vehicle in the conventional elastic bearing. Improved fixing wedges that play a role of fixed end and one-way fixed end by suppressing shear deformation of rubber, while suppressing side reaction force while being able to withstand wind load and braking load of vehicle, and attaching leaf spring for easy pad replacement It is related to the elastic bearing.

In general, the bridge structure has a longer length than the width of the building structure, so the temperature change of the bridge deck due to seasonal temperature change and daily crossover is severe. Especially, in the four seasons, such as Korea, If it cannot accommodate the expansion and contraction, the thermal stress can seriously affect the bridge structure. Therefore, the horizontal rubber is placed on the top of the bridge so that the horizontal stress is not applied to the contact area between the bridge deck and the bridge. To support the stretching and temperature of the bridge deck while supporting the weight of the bridge deck and the vehicle load. However, if there is no fixed point that acts as the center point of the bridge deck, there is an unreasonable point that the bridge deck swings against horizontal loads such as wind load and vehicle braking load. Therefore, the pads support the vertical load and the brake load and wind load of the vehicle. Fixing wedges installed on the upper and lower plates 2 and 3 by welding prevent the shear deformation of the pads as shown in FIGS. 1A and 1B to serve as fixed ends and one-way fixed ends. 2A, 2B, and 2C, a form using the elastic support includes a fixed end elastic support, one-way fixed end elastic support, and a bidirectional movable end elastic support.

The conventional fixed end elastic bearing is embedded in the top of the pier as shown in Figure 2a stud bolt 31 to be fixed to the pier concrete is attached to the lower surface and the lower plate wedge 32 protruding a certain height on both sides of the upper surface Is attached to the upper plate and the lower plate (3) is attached to the upper end of the lower plate (3) is embedded in the lower end of the bridge upper plate to be fixed to the upper plate and the lower plate of the lower plate (3) on both sides The upper plate (2) to which the upper plate wedge (22) inserted into the wedge (32) is attached and welded, and rubber or reinforcing steel plates are alternately stacked between the upper and lower plates (2, 3). The pad 1 is comprised.

However, the above is an example of the fixed end elastic bearing. When the upper plate wedge 22 and the lower plate wedge 32 are properly adjusted, as shown in FIGS. 2B and 2C, the one-way fixed end or the upper plate wedge 22 and It is also possible to produce a bidirectional movable end without installing the lower plate wedge 32.

Therefore, the conventional design configured as described above has the upper and lower plates 2 and 3 embedded in the bridge top plate and the pier by the stud bolts 21 and 31, respectively, and move integrally with the bridge top plate. In the case of this symmetry point, the fixed end support is used. The fixed end is fixed by inserting the lower plate wedge 22 into the upper plate wedge 32 so that the pad 1 transmits only vertical load without deforming in the horizontal direction and brakes the vehicle. The horizontal load due to the load is transmitted to the piers through the wedges.

On the other hand, the one-way fixed end to resist the wind load in the perpendicular direction of the bridge top plate without restraining the longitudinal temperature stretch of the bridge top plate, the two upper plate wedges 32 and the lower plate wedge 22 resists the wind load It does not resist temperature displacement.

That is, the elastic support has a disadvantage that the bridge top plate easily shakes due to the wind load and the braking load of the vehicle, since the horizontal rigidity is considerably less than the vertical stiffness, so that the upper and lower plates (2, 3) are usually used to improve the usability of the bridge. By attaching the fixing wedge by welding, the horizontal load due to the wind load and the braking load of the vehicle is transmitted to the bridge structure through the fixing wedge, and the vertical load and the rotational deformation due to the wind load and the braking load of the vehicle are applied to the pad. It is to be accommodated by, but also partly accommodated by an auxiliary device such as the wedge. On the other hand, since the fixing wedge cannot support large loads such as earthquakes, the wedge is broken, so that the entire bridge lengthens the inherent period of the bridge with the flexibility of the elastic bearing to reduce the seismic force and distribute the seismic load to each pier. After the earthquake, the wedges are rewelded.

In addition, in the conventional elastic support, the pad 1 is manufactured separately from the upper and lower plates 2 and 3 so that the pad 1 can be replaced during the life of the bridge due to the lack of reliability regarding the durability of the rubber. Therefore, when the pad is sheared in a considerable amount, a gap occurs between the pad and the upper and lower plates, which causes the pad to move to a position different from the initial position when the pad is returned to its original position.

However, in the above-described conventional design

First, when excessive horizontal load is applied to the pad, the fixing wedge is easily broken, especially when horizontal load such as earthquake load and excessive wind load is applied, and temperature extension of the bridge deck like a curved bridge is a part of elastic support. In the case of causing a large amount of displacement in the fixing wedge had a problem.

Second, the fixing wedge is basically used to be attached to the upper and lower plates, re-welding the broken fixing wedge in the field has a problem of causing a welding failure and damage the rubber by the heat of welding.

Third, the pad is deteriorated by the natural ozone and ultraviolet light, so in some cases it is necessary to replace the pad, and the conventional elastic bearing should be replaced by lifting the wedge and lifting the bridge deck. In this case, it was almost impossible to re-weld the wedges.

Fourthly, in the conventional elastic bearing, a considerable size of upper and lower plates are required in consideration of the free area for shear deformation of the pad and the attachment and re-welding of fixing wedges, resulting in a problem of increased cost, and an excessively large upper plate. This caused a problem that is out of the center of the bridge deck plate is attached.

Fifth, the upper and lower plates could not be attached to the pads to replace the pads due to long-term use, and this could not cause any resistance to the side reaction caused by lifting of the bridge top plate. . For example, a PC beam bridge widely used in elastic bearings allows each PC beam mounted on the elastic bearings to be integrally fixed by placing a cross beam and placing slab concrete on top thereof. However, if one PC beam is inverted due to inadvertent work and typhoons, etc. before the cross beams connecting the PC beams are completely fastened, the phenomenon that all PC beams are conducted by domino phenomenon is likely to occur in construction. there was.

The present invention is devised to solve the above problems, the object of the present invention is to be able to accommodate rotational deformation in all directions, which is the basic function of the pad, without using a welded wedge that is easy to break but difficult to re-weld. It provides a fixed end and a one-way fixed end against wind loads and braking loads of the vehicle, and is equipped with an easy-to-detach plate spring type movement limiter that can accommodate a large displacement of the bridge deck's temperature. In providing.

In order to achieve the above object, the present invention, instead of the conventional fixing wedge between the upper and lower plates, while accepting the rotational deformation function for all directions basically required in the elastic support, resistance and tolerance to horizontal deformation At the same time, it is characterized in that the detachable leaf spring type mobile limiting device is connected to both sides and four sides of the pad at a predetermined distance.

Figure 1a is a cross-sectional view showing the rotation of the conventional elastic bearing,

Figure 1b is a front view showing the shear deformation of the conventional elastic bearing,

Figure 2a is a partial cutaway perspective view showing a conventional fixed end elastic bearing,

Figure 2b is a partial cutaway perspective view showing a conventional one-way fixed end elastic support,

Figure 2c is a partial cutaway perspective view showing a conventional bidirectional movable end elastic support,

Figure 3 is a perspective view showing the configuration of the present invention is installed and applied to the elastic support for the bridge.

※ Explanation of codes for main parts of drawing

1: pad 11: reinforcing steel plate

12: rubber 2: upper plate

21, 31: stud bolt 22: top plate wedge

3: lower plate 32: lower plate wedge

4: leaf spring 5: fastening bolt

6: home

Hereinafter, with reference to the accompanying drawings will be described in detail.

Figure 3 is a cross-sectional view showing the configuration of the present invention is installed and applied to the elastic support for the bridge.

As shown in the present invention, the upper plate 2 mounted on the bridge top plate, the lower plate 3 mounted on the bridge, and the rubber 12 and the reinforcing iron plate 11 are laminated between the upper and lower plates. In the elastic support (1) inserted, plate springs (4) attached to the upper and lower plates (2, 3) slightly spaced apart on both sides and four sides of the pad (1), and the leaf springs (4) The fastening bolt 5 is connected to the upper and lower plates 2 and 3 so as to be easily removable from the outside.

The above-described configuration of the present invention primarily accommodates the vertical and horizontal loads so that the compressive deformation due to the vertical load of the pad 1 and the horizontal deformation due to the horizontal load are not constrained by the pad 1. Since it is reinforcement against excessive vertical load and horizontal load by the rigidity of the leaf spring 4, as a result, it acts to suppress the excessive rotational deformation of the bridge structure by reinforcing the rotational rigidity of the conventional pad.

The length of the leaf spring (4) installed in the direction of suppressing the horizontal displacement can be installed about 1.5 times longer than the length of the conventional wedge, and using a leaf spring of about 5mm thickness is about half the thickness of the weld neck when using the wedge In terms of cross-sectional area, it corresponds to about 75% of the wedge weld surface. However, the shear strength of the spring steel used for the leaf spring (4) corresponds to about 3.5-4 times that of the welded rolled steel (SWS490) used for the wedge, so about three times the wedge 22 and the guide wedge 32 It can withstand shear stresses. In addition, in the case of the wedge 22 and the guide wedge 32, the composite force due to the shear force and the moment should be considered, but in the case of the leaf spring 4, since there is no force for the moment, it is safer.

In general, in the case of the bridge structure, the wind load is less than 10% of the vertical load, and in the case of earthquake loads, most of it exceeds 15% of the vertical load. It can endure without damage and can be easily replaced in the event of a huge earthquake that surpasses the design earthquake force.

That is, when the pad 1 is to be replaced under the structure of the present invention, since there is no wedge 22 and the guide wedge 32, there is no need to tear off the wedge 22 and the guide wedge 32 and reweld it as in the conventional design. , Simply loosen the fastening bolt (5) for fastening the leaf spring (4) to the upper and lower plates, remove the leaf spring from the elastic support, and then simply replace the pad (1).

Comparing the horizontal wedge capacity of the conventional wedge-shaped elastic support and the elastic support by the leaf spring of the present invention is shown in Table 1 below.

Comparison table of horizontal resistance capacity Vertical load Conventional Wedge Type Leaf spring method of the present invention Horizontal resistivity Horizontal Load / Vertical Load Horizontal resistivity Horizontal Load / Vertical Load 100 tons (250 × 400) 6.4 tons 6.4% 10 tons 15% 200 tons (300 × 600) 11.6 tons 5.8% 20 tons 15% 300 tons (450 × 600) 17.4 tons 5.8% 30 tons 15% 500 tons (600 × 700) 27.0 tons 5.4% 50 tons 15% 600 tons (700 × 700) 31.5 tons 5.3% 60 tons 15% 700 tons (700 × 800) 36.0 tons 5.1% 70 tons 15% 800 tons (800 × 800) 41.1 tons 5.1% 80 tons 15% 1000 tons (900 × 900) 52.1 tons 5.2% 100 tons 15%

The present invention constituted as described above has the same function as the conventional elastic bearing of the conventional vertical load of the bridge deck, for example, the load of the bridge deck delivered from the upper plate 2 is reinforced steel plate 11 and rubber ( It is supported and accommodated by the vertical stiffness of the pad 1, which is composed of 12), and the horizontal displacement caused by the temperature expansion and contraction of the bridge top plate due to the temperature difference of the atmosphere generates temperature stress because the rigidity of the leaf spring (Y direction) is not restricted. The horizontal load such as wind load and braking load of the vehicle can be suppressed by the lateral stiffness of the leaf spring (X direction) for the horizontal load which can improve the usability of the bridge.

Since the pad 1 used in the present invention is inserted into the inner space formed by the upper and lower plates 2 and 3 and the leaf spring 4, the pad 1 is represented in the longitudinal direction for technical convenience. It can be configured in any shape, and at this time the setting of the position or number of the leaf spring 4 is the same as the conventional design.

In addition, in the present invention, since it is composed of a plate spring (4) having elastic restoring force, an additional function of compensating the creep characteristics of the pad (1) due to the horizontal displacement which is left for a long time due to seasonal temperature displacement to have the characteristic to return to the original position There is also.

In addition, the present invention takes advantage of the above-mentioned characteristics of returning to the original position, and when the pad is excessively horizontally deformed due to the temperature shift of the bridge top plate, the pad slips off the lower plate, thereby deviating from the center point of the upper and lower plates. The groove | channel 6 in which a pad is put is provided in the center of the said upper and lower plates so as to prevent it.

As described above, the present invention can significantly reduce components that are difficult to repair and difficult to repair, such as fixing wedges, in the conventional elastic support, without affecting the rotation function, which is a basic function of the pad. The size of the bottom plate can be reduced so that it does not exceed the width of the PC beam. In addition, the plate spring is connected to the upper and lower plates and fastening bolts for easy removal, and thus, the plate spring has a great effect on the convenience for the construction and regular pad replacement.

Existing designs have suffered the disadvantages of re-welding to attach horizontal bearings without disturbing the basic rotational functions that bridge bearings should have, and attached separate fixing wedges by welding to upper and lower plates. Rotational deformation can be accommodated by the vertical deformation capacity of the leaf spring, and in the horizontal direction, it is connected to the upper and lower plates by a fastening bolt (5) while having both a direction capable of accommodating the displacement and a direction of suppressing the displacement. There is an advantage that can be easily removable.

In addition, the leaf spring (4) is connected to the upper and lower plates in the vertical direction, thereby preventing excessive rotational deformation of the bridge top plate to protect the bridge top plate, and in bridges where side reactions occur, such as in curved bridges, It also has the additional function of resisting negative reaction.

Claims (3)

Pads formed by laminating rubber 12 and reinforcing steel plates 11 between the upper plate 2 installed on the bridge top plate, the lower plate 3 installed on the bridge, and the upper and lower plates 2 and 3 ( In the elastic support into which 1) is inserted, Both sides of the pad 1 are slightly spaced apart on the four sides, and the leaf springs 4 are attached to the upper and lower plates 2 and 3, respectively, and one end thereof is inserted into the upper and lower plates 2 and 3, respectively. The other end is inserted into the leaf spring (4), the leaf spring type movement limitation, characterized in that the additional configuration of the fastening bolt (5) for connecting the leaf spring (4) and the upper and lower plates (2, 3) Elastic foot with device attached. The upper and lower plates (2 and 3) of claim 1, wherein the leaf spring (4) is used to fasten the upper and lower plates (2, 3) to the outside using the fastening bolt (5). The plate spring type movement limiting device is characterized in that the contact portion is flat and the portion not in contact with the upper and lower plates 2 and 3 is bent in a bow shape from the inside of the upper and lower plates 2 and 3 to the outside. Elastic bearings. The upper and lower plates (2) according to claim 1, wherein the upper and lower plates (2, 3) are provided with the pads (1) placed on the upper and lower plates (2, 3) due to the temperature displacement of the bridge upper plate (2). , 3) An elastic support with a leaf spring type movement limiting device, characterized in that the groove (6) is formed to prevent deviation from the center point.