KR101051439B1 - Lead Isolation Support Device with Improved Isolation Performance - Google Patents

Abstract

The present invention relates to a lead base bearing installed between an upper plate 10 installed on a bridge and a lower plate 20 installed on a bridge, and between the upper plate 10 and the lower plate 20, respectively. The upper and lower end plate 100 which is in close contact with each other, is formed with a coupling groove 140 to be opened outward on the outer circumferential surface of the central center hole 120, and the locking jaw 160 is formed on the circumferential surface of the outer edge end. 100a; Spacers 200 and 200a which are respectively positioned in the coupling grooves 140 and are respectively coupled to the upper and lower end plates 100 and 100a; A lead rod 300 having upper and lower ends respectively installed between the spaces 200 and 200a through the center holes 120 of the upper and lower end plates 100 and 100a; The upper and lower end plates 100 and 100a are coupled between the upper and lower end plates 100 and 100a so as to surround the lead rod 300 and the upper and lower ends of the outer edges are in close contact with the upper and lower plates 10 and 20. Wrapped around the rubber support 400 is fitted to the engaging jaw 160 and coupled; The rubber support 400 includes a plurality of reinforcement plates 500 positioned vertically and equally spaced apart from each other to support the lead rods 300.

Description

Lead Rubber Bearing Improved seismic Isolate capability

The present invention relates to a lead seismic bearing support device, and more particularly, the lead seismic bearing installed between a bridge and a pier controls the wind load which is always a horizontal force under the vertical load and the seismic force during the earthquake. Even if a strong tensile force is generated in the event of a large shear displacement, the upper and lower edges of the lead base bearings can be stably fixed, and at this time, the shape of the lead rods is maintained so that there are no voids. The present invention relates to a lead seismic isolator with improved seismic performance applied with a lead protective material for improving seismic performance preventing and maintaining damping performance continuously.

In general, a bridge is provided with a seismic isolation device between a bridge which is a substructure installed on the ground and an upper structure that is installed on the upper surface of the bridges to form a road for moving a vehicle or the like.

The seismic isolator is to play a role of distributing the load acting on the upper structure between the upper structure and the lower structure of the bridge to the lower structure, and various structures are presented as elastic bearing, lead side bearing and rubber bearing. It is.

The elastomeric bearing is a structure in which several layers of internal reinforcing steel plates and internal rubber layers are laminated, and there is no separate damping device. The device has no equivalent damping ratio of 12% or less, and thus has no damping function. There is a problem that can not be applied to bridges, bridges installed in areas with high earthquake intensity.

The lead rubber bearing is provided with upper and lower end plates 30 and 40 between upper and lower plates 10 and 20 as shown in FIG. 1 and the upper and lower end plates 30 and 40. Lead rod 50 in the center is composed of a rubber base 60 indented. In addition, the reinforcing plate 70 is laminated in the rubber support 60 to prevent vertical sag and increase vertical rigidity. In addition, the reinforcement plate 70 has a function of preventing deformation of the lead rod 50 when a horizontal displacement occurs.

The upper and lower end plates 30 and 40 are respectively fixed to each other by bolts 90 between the upper and lower plate 10 and 20.

In the assembled assembling lead seismic bearing as described above, the upper plate 10 is fixed to the bottom of the upper structure of the bridge by a bolt 92, the lower plate 20 is located on the upper surface of the bridge It is fixed to the bolt structure 92 is coupled to the substructure.

In the case described above, the lead rod 50 inserted into the rubber support 60 is soft, so that the press rod 50 may be press-fitted only at both ends as shown in FIG. In addition, if the shear bar is applied while the shear force is deformed when the horizontal force is applied, the pressure is applied to the inner reinforcing plate and the rubber layer to compress the rubber layer and lead to the rubber layer, which is not easily deformed and restored as shown in FIG. When more than the force is generated, heat is generated, yielding to the metal characteristics, it loses its elasticity and becomes a plastic state.After the force is removed, it is momentarily restored by the elastic force of the rubber layer, and the recrystallization time of lead is sensitive to the temperature and heat energy is dissipated. Recrystallization occurs. In addition, since the characteristics are very sensitive to change depending on the manufacturing technology or quality control state of the manufacturer, there is a limit to use universally.

The rubber bearing is a structure in which a plurality of inner reinforcing plates and inner rubber layers are laminated, and a method of adding a viscous material when rubber is mixed. The equivalent viscous attenuation ratio is 12% or less, and thus the damping performance is not good. Long bridges and bridges installed in areas with high earthquake strength have very uneconomical problems due to increased capacity or quantity. In addition, since the characteristics change greatly depending on the temperature, there is a problem that many restrictions are applied to the application in an environment having a large annual difference such as in Korea.

In addition, since the viscous material is added during rubber compounding, properties are very sensitive to change depending on the manufacturing technology or quality control state of the manufacturer, and thus there is a problem that there are many restrictions to use universally.

Despite this problem, the seismic isolator is fixed by the momentary resistance of the lead during earthquake, unlike the case where a large horizontal force acts on the fixed pier pier of the general bearing due to the inertia force proportional to the mass of the superstructure during the earthquake. Unlike the seismic power is concentrated in one fixed end pier as the stage is changed, the seismic power is distributed to the whole piers to prevent breakage of the piers. On the other hand, the displacement of the base bearing is largely generated, and as shown in FIG. 3 or 4, a large tensile force is generated at the upper and lower edges, thereby peeling off, thereby rapidly deteriorating aging.

In addition, the lead rod applied to the lead seismic support device has a constant diameter before indentation, but when the lead rod 50 is placed in the rubber base 60 to make a finished product, a gap is generated when the horizontal rod is acted upon by a seismic force or the like. There is a problem that the load is not properly transmitted to the pressurized bar by applying pressure to the lead rods 50 at the top and bottom. In this case, as shown in FIG. 1, since lead is ductile and easily deformed, it is impossible to press-fit to the hole center of the laminated rubber support 60, so that press-fitting is performed only at both ends. In addition, a spacer 80 is inserted and the upper and lower plates 10 and 20 are combined with the end plates 30 and 40 and the bolt 90 so that lead does not push out when absorbing seismic force after the press-fitting. do.

When the finished product assembled as described above is repeatedly installed in the field and the repetitive behavior, as shown in FIG. 2, the pressure bar 50 generates pressure between the intermediate reinforcement plate 70 and the reinforcement plate 70. 60) is deformed while the lead rod 50 is compressed into a portion. At this time, the lead rod 50 is sag phenomenon by the h1 from the initial length (L) is reduced by the length L1 has a problem that can not effectively control the wind load or seismic force during nonlinear behavior. In addition, the problem of lead shearing and nonlinear curve reduction in the elastic support hole and lead voids is reduced, that is, the dissipation energy is reduced and the stiffness change causes actual seismic forces to be greater than actual.

In order to control this, Korean Utility Model Registration No. 20-0254739 has been presented with a "pyeonmyeonjinbyeon support with a lead protection tube".

This is to control the deformation force of the lead rod through the lead protection tube (steel wire, high-tensile fiber material) made of an elastic body and to absorb a uniform earthquake force, but this is not a manufacturing problem.

In addition, when repeated behavior may be torn or damaged due to friction of the reinforcing plate is possible short-term effect, but considering the life of the bridge and the base of the base bearing is difficult to expect the effect in the long term.

In addition, the lead seismic bearing has to absorb the earthquake displacement, so the displacement is large. In the case of the currently constructed lead seismic bearing, the edges are mostly peeled off and the aging is rapidly progressing.

In order to solve this problem, Korea Patent Registration No. 10-0401234 "Integrated seismic isolator with improved adhesive strength" has been presented and registered.

This is a method of improving the edge adhesive strength, but the repetitive phenomenon in which the edge adhesive portion does not overcome the strong tensile force and the adhesive portion is peeled is reproduced.

FIG. 3 illustrates a phenomenon in which a conventional lead seismic isolator is aging as the adhesive part is severely peeled from the edge while continuously receiving a tensile force in a shared bridge.

Figure 4 is a conventional lead seismic isolator receives a horizontal force in the bridge in common, due to the problem that the length of the lead rod is reduced when the shear displacement occurs due to the problem that the shear rod is an abnormal shear deformation caused by the departure from the upper end plate and normal control during wind load or earthquake occurrence It is a situation where the performance is not secured.

Accordingly, the present invention is to prevent the phenomenon that the energy dissipation capacity due to the deformation, shear or voids of the lead rod when the horizontal force occurs in the lead seismic bearing which is the above problem and the upper and lower edges peel off when the strong tensile force caused by the horizontal shear displacement In order to achieve the same energy dissipation capacity as possible by minimizing the deformation of the lead rod when the horizontal shear displacement occurs due to wind load or earthquake displacement, the upper and lower edges of the rubber bearing are strong. It is to prevent the aging phenomenon of the edge adhesive portion by wrapping and fixing the end plate so that it can withstand without peeling even when tensile force is generated.

In order to achieve the above object, the present invention, in the lead seismic isol between the upper plate is installed on the bridge and the lower plate is installed on the bridge,

The upper plate and the lower plate are in close contact with each other, the center hole in the upper and lower axial direction is formed in the center, the engaging groove is formed to be opened outward on the outer circumferential surface of the center hole, the outer circumferential edge An upper and lower end plate having a locking jaw formed on a surface thereof; Spacers respectively positioned in the coupling grooves and coupled to the end plates by bolts; A lead rod having an upper and lower end passing through the center hole of the upper and lower end plates, respectively, between the space and the spacer; A rubber support positioned between the upper and lower end plates to surround the lead rods, and having a locking end such that upper and lower ends of the outer edge surround the upper and lower end plates in close contact with the upper and lower plates and are fitted to the locking jaws to be engaged; It is configured to include a plurality of reinforcing plate is positioned at equal intervals in the interior of the rubber support and supporting the lead rods.

Here, between the reinforcing plate and the reinforcing plate, it is preferable to further provide a lead protection plate for supporting the lead rods.

In addition, the outer diameter of the lead protective plate is preferably made smaller than the outer diameter of the reinforcing plate.

In addition, the inside of the locking jaw, the fixing grooves which are open outwardly each along the circumference is further formed to be fitted to be fixed to the fixing portion formed in the locking end of the rubber support.

In addition, the lead protection plate will be possible to be made of a carbon fiber mesh.

Therefore, the seismic isolator with improved seismic isolation performance according to the present invention prevents the deformation of the lead rods and thus suppresses the generation of voids between the rubber bearings and the lead rods, thereby preventing shear failure of the lead rods and ensuring the same energy dissipation capacity as the theoretical lifespan. To prevent excessive earthquake loads on the structure. In addition, the upper and lower edges of the outer edge of the rubber support wraps around the end plate and is fixedly coupled, so that even when a strong tensile force is generated, the edge adhesive portion does not peel off, thereby improving durability life and life of the structure.

In addition, since the adhesive does not need to be used when the rubber base and the end plate are combined, there is an effect of minimizing the peeling phenomenon due to friction.

1 is a half cross-sectional view of a conventional lead seismic bearing,
2 is a volume change diagram showing a volume change when the deformation force is generated in the lead rod of FIG.
3 is an example in which peeling occurs at the edge adhesive portion of the conventional lead seismic bearing,
4 is an example in which an abnormal displacement occurs because the lead rod of the conventional lead seismic isolator is separated from the upper end plate,
Figure 5 is a half cross-sectional view of the lead seismic bearing according to the present invention,
6 is a volume change diagram showing the volume change when the deformation force is generated in the lead bar of FIG.
7 is another embodiment according to the present invention in an enlarged view "C" of FIG.
8 is an example of a nonlinear hysteresis curve in which the lead damping capacity is normal.
9 is an example of a nonlinear hysteresis curve in which the energy attenuation capacity of the lead is significantly reduced.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the lead seismic bearing according to the present invention will be described in detail and when it is determined that the known art related to the present invention can obscure the subject matter of the present invention Will be omitted.

Figure 5 shows a half cross-section of a lead base bearing according to the present invention.

The present invention relates to a lead base is installed between the upper plate 10 installed on the bridge and the lower plate 20 installed on the bridge by FIG.

The lead base bearing is, the upper and lower plates 10 and 20, the upper and lower end plate 100, 100a and the center and the lead bar 300 is coupled to the upper and lower ends A rubber support 400 installed between the plates 100 and 100a, spacers 200 and 200a installed on the upper and lower end plates 100 and 100a to support upper and lower ends of the lead rod 300, It is configured to include a plurality of reinforcement plate 500 is installed to support the lead rod 300 in the interior of the rubber support (400).

The upper and lower plates 10 and 20 are respectively coupled and fixed by bolts 92 between the upper structure forming the bridge and the corresponding surface of the lower structure provided on the upper surface of the bridge.

That is, the upper and lower plates 10 and 20 are bolted 92 to the upper structure and the lower structure, respectively, which form a bridge in a state in which a lead base bearing is coupled between the upper and lower plates 10 and 20 as in the known art. Combined and fixed.

The upper and lower end plates 100 and 100a are tightly coupled to each other between the upper plate 10 and the lower plate 20 so as to be fixed by bolts 90, and the lead rod 300 is disposed at the center thereof. A center hole 120 in the up and down axial direction is formed to pass therethrough, and the spacers 200 and 200a are coupled so as to be coupled outwardly so as to open outward on the outer circumferential surface of the center hole 120. Groove 140 is formed. In addition, the upper and lower end plates 100 and 100a have a locking step 160 formed on the circumferential surface of the outer edge.

The spacers 200 and 200a are respectively positioned in the coupling groove 140 and are coupled to the upper and lower end plates 100 and 100a by bolts 220, respectively.

The lead rod 300 is the same as that known in the art, and the upper and lower ends pass through the center hole 120 of the upper and lower end plates 100 and 100a, respectively, and are installed between the space 200 and the spacer 200a.

The rubber support 400 is located between the upper and lower end plates 100 and 100a and coupled to surround the lead rods 300 through upper and lower inner center holes 410 and upper and lower ends of the outer edge of the upper and lower ends. A locking end 420 is formed to surround the upper and lower end plates 100 and 100a in close contact with the plates 10 and 20 so as to be fitted to the locking jaw 160 to be engaged.

In other words, the rubber support 400 couples the upper and lower end plates 100 and 100a through the locking end 420 provided on the upper and lower sides, respectively, and simultaneously the lead rod 300 to the center hole 410 provided at the center. ) Can be combined. Thereafter, the spacers 200 and 200a are coupled to the upper and lower end plates 100 and 100a, respectively, to keep the lead rod 300 in a fixed state. Then, when the upper and lower plates 10 and 20 are respectively positioned on the upper and lower surfaces of the rubber support 400, the assembly is completed.

The reinforcement plate 500 is positioned up and down at an equal interval inside the rubber support 400 to support the lead rod 300.

Here, a lead protection plate 520 for supporting the lead rod 300 may be further provided between the reinforcement plate 500 and the reinforcement plate 500.

This is to prevent irregular deformation when the vertical force of the lead rod 300 is generated as shown in FIG. 6.

That is, when displacement occurs due to seismic force in the lead rod 300, the initial lead rod 300 is compressed at full length L. At this time, only the h2 'is compressed through the reinforcement plate 500 and the lead protection plate 520, so that the non-linear behavior can be achieved. It can control and absorb wind load or seismic force.

Here, the outer diameter of the lead protective plate 520 is formed smaller than the outer diameter of the reinforcing plate 500.

Preferably, as can be seen in the figure of Figure 5 is preferably formed in the size of 1/3 to 1/5 with respect to the outer diameter of the reinforcing plate 500.

This means that the reinforcement plate 500 supports the initial strong vertical and horizontal deformation force when the deformation force of the lead rod 300 is generated, and at the same time, the horizontal deformation force is provided through the gap between the reinforcement plate 500 and the other reinforcement plate 500. If it occurs minutely it will control this.

In addition, the lead protection plate 520, it will be possible to be made of carbon fibers in the mesh shape as well as metal or synthetic resin material.

In this case, the lead protection plate 520 can increase the durability as well as the fixing force by affinity with the rubber support 400.

7 is another embodiment according to the present invention, such that the fixing grooves 180 which are respectively opened outward along the periphery of the locking projection 160 formed in the upper and lower end plates 100 and 100a are further formed. It is shown.

The fixing groove 180 is fixed to the fixing portion 440 formed on the locking end 420 of the rubber support 400 is fixed to minimize the peeling phenomenon by securing a stable adhesion and fixing force when the tensile force is generated.

When the seismic forces, such as the seismic force is generated in the assembled state as described above, the structure can be controlled by the plastic behavior of the lead rod 300, and the edge peeling of the rubber feet 400 due to the frequent horizontal behavior occurs. The development may prevent the peeling phenomenon by increasing the adhesive strength of the upper locking end 420 of the rubber support 400 and the elastic support force.

8 is an example of a nonlinear hysteresis curve in which the energy attenuation capacity of the lead isolation bearing shows normal performance as designed.

FIG. 9 is a non-linear hatched area in which the energy damping capacity of the lead isolation base is different from the design, and thus the energy attenuation capacity of the lead isolation base is significantly reduced due to the gap between the lead rod insertion hole and the lead rod or the deformation of the lead rod. This is a hysteresis curve.

When the seismic forces, such as the seismic force is generated in the assembled state as described above, the structure can be controlled by the plastic behavior of the lead rod 300, and the edge peeling of the rubber feet 400 due to the frequent horizontal behavior occurs. The development may prevent the peeling phenomenon by increasing the adhesive strength of the upper locking end 420 of the rubber support 400 and the elastic support force.

100: upper end plate 100a: lower end plate
120: center hole 140: coupling groove
160: locking step 180: fixing groove
200,200a: spacer 220: bolt
300: salary
400: rubber base 410: center hole
420: locking step 440: fixing part
500: gusset
520: lead shield

Claims (3)

In the lead seismic bearing which is installed between the upper plate 10 installed on the bridge and the lower plate 20 installed on the bridge,
The upper plate 10 and the lower plate 20 are in close contact with each other, the center hole 120 in the vertical direction is formed in the center, outwardly on the outer circumferential surface of the center hole 120 A coupling groove 140 is formed to be open, and upper and lower end plates 100 and 100a having a locking step 160 formed on the circumferential surface of the outer edge end;
Spacers 200 and 200a which are respectively positioned in the coupling grooves 140 and are respectively coupled to the upper and lower end plates 100 and 100a by bolts 220;
A lead rod 300 having upper and lower ends passing through the center hole 120 of the upper and lower end plates 100 and 100a, respectively, between the space 200 and the spacer 200a;
The upper and lower end plates 100 and 100a are coupled between the upper and lower end plates 100 and 100a so as to surround the lead rod 300 and the upper and lower ends of the outer edges are in close contact with the upper and lower plates 10 and 20. A rubber support 400 having a locking end 420 to surround the locking jaw and fitted to the locking jaw 160;
A plurality of reinforcing plates 500 positioned vertically and equally spaced inside the rubber support 400 to support the lead rods 300;
Between the reinforcement plate 500 and the reinforcement plate 500 arranged up and down is formed having a small outer diameter of 1/3 to 1/5 of the outer diameter of the reinforcement plate 500 to the lead rod 300 A plurality of lead shield plates 520 for supporting;
Lead seismic support device with improved seismic performance, characterized in that configured to include
The method according to claim 1,
Inside the locking jaw 160,
Fixed base 180 is further formed along the circumference of each of the fixing grooves 180 is further formed, the seismic performance is improved lead seismic support, characterized in that the fixing portion 440 formed in the locking end 420 of the rubber support 400 is fitted Device.
The method according to claim 1,
The lead protection plate is improved the seismic isolation performance, characterized in that the lead protection plate 520 is made of carbon fiber mesh.

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