CN114875782A - Earthquake recognition type shock-resistant support - Google Patents

Abstract

The invention relates to the technical field of bridge supports, and aims to solve the problems that a section of non-rigid sliding area is arranged between a first-stage limiting protection structure and a second-stage limiting protection structure in the conventional two-stage anti-seismic spherical steel support, after the first-stage limiting protection structure fails, a second-stage stop block needs to bear a large impact load, and the second-stage stop block is easily damaged by impact; a shear pin is connected between the inner stop block and the lower support plate; a cavity is formed between the inner stop block and the outer stop block, and a buffer piece is accommodated in the cavity; according to the invention, the buffer piece is arranged between the inner stop block and the outer stop block, so that a non-rigidity sliding area is not arranged between the inner stop block and the outer stop block, the buffer piece can absorb and absorb a part of earthquake energy, the impact load to the outer stop block is reduced, and the safety performance of a bridge structure is improved.

Description

An earthquake-recognized shock-resistant bearing

technical field

The invention relates to the technical field of bridge bearings, in particular, to an earthquake identification type anti-shock bearing, which is used in the Shanghai-Chongqing-Gao-Rong high-speed railway north branch bridge project on the Yangtze River.

Background technique

At present, the large horizontal force bearings used in bridge engineering are basically the first-class seismic type, that is, according to the horizontal bearing capacity requirements proposed by the design, a stop is set on each side of the lower bearing plate of the bearing. The blocks are consolidated with the upper support plate to withstand horizontal loads. Once the horizontal force generated by accidental factors such as earthquakes exceeds the ultimate bearing capacity of the block, the block will be sheared and the horizontal restraint structure will be lost. There are cables to pull the beam body), which is extremely unfavorable for arch bridges and simply supported beams, and there is no measure that can be relied on after the first limit fails.

There is already a second-level seismic type spherical steel bearing in the industry. On the basis of the ordinary bearing, a limit protection structure is added to realize the hierarchical limit function of the structure to a certain extent. There is a non-rigid slip area between the position protection structures. After the first-level limit protection structure fails, the second-level stopper needs to carry a large impact load, so the second-level stopper is easily damaged by impact.

SUMMARY OF THE INVENTION

The present invention aims to provide an earthquake identification type impact-resistant bearing, so as to solve the problem of a non-rigid slippage between the first-level and second-level limit protection structures in the existing second-level earthquake-resistant spherical steel bearings In this area, after the first-level limit protection structure fails, the second-level block needs to carry a large impact load, and the second-level block is easily damaged by the impact.

The present invention adopts the following technical scheme to realize:

An earthquake identification type impact-resistant bearing includes an upper bearing plate, a spherical crown lining plate, and a lower bearing plate arranged in sequence from top to bottom, and the upper bearing plate and the spherical crown lining plate are provided with a spherical sliding plate, a plane sliding plate is arranged between the spherical crown lining plate and the lower support plate;

The lower support plate is provided with an inner block and an outer block on both sides in the upward direction of the transverse bridge, and the inner block is located between the upper support plate and the outer block;

A shear pin is connected between the inner block and the lower support plate;

A cavity is formed between the inner block and the outer block, and a buffer is accommodated in the cavity.

It can be seen from the above content that the inner stopper is closer to the upper support plate than the outer stopper. Under special conditions such as earthquakes, the beam body is displaced in the upward direction of the transverse bridge. The outer stopper blocks upwards on the transverse bridge to avoid dangerous situations such as falling beams.

Since a shear pin is connected between the inner stop and the lower support plate, the rigidity of the shear pin before breaking is used as the first rigidity of the structure, which has a certain impact resistance, but if the inner stop is When the impact force exceeds the strength of the shear pin, the shear pin is broken, and the inner stopper will impact the outer stopper. The present invention is between the inner stopper and the outer stopper. A chamber is arranged, and a buffer is arranged in the chamber. Therefore, there is no rigid slip zone between the inner block and the outer block, and the buffer can absorb and absorb part of the seismic energy, reducing the impact on the The impact action of the block reduces the impact load on the outer block and improves the safety performance of the bridge structure.

As the preferred technical solution:

A rotating sleeve is disposed between the inner block and the upper support plate, and the rotating sleeve is sleeved on the outer side of the upper support plate.

The purpose of setting the rotating sleeve is to avoid the force concentration of the inner stop caused by the corner, so that the shear pin is not broken in the design state.

As the preferred technical solution:

A pressure plate is connected to the top of the inner block, and the pressure plate is partially extended from the inner block and is crimped to the top of the rotating sleeve.

The pressing plate is crimped on the top of the rotating sleeve and can limit the rotating sleeve.

As the preferred technical solution:

The pressing plate and the inner block are connected by bolts.

As the preferred technical solution:

The buffer member is an elastic material member or a fluid material member.

As the preferred technical solution:

The elastic material components are rubber, steel shrapnel and the like.

Used to increase the lateral stiffness of the structure.

As the preferred technical solution:

The fluid material member includes an oil bag filled with a fluid buffer material, and the oil bag is broken when squeezed.

The fluid buffer material is wrapped with an oil bag design to avoid loss under normal conditions. However, under special conditions such as earthquakes, the oil bag will rupture under the action of external force, realizing the external flow of the fluid buffer material.

As the preferred technical solution:

The fluid buffer material is silicone oil, hydraulic oil and the like.

As the preferred technical solution:

Both the inner block and the outer block are provided with two steps, the stepped surfaces of the two are arranged oppositely, the outer block is matched with the inner block, and two cavities are formed between the two. chambers, respectively a first chamber and a second chamber, the top of the first chamber being closed by the pressure plate.

The stepped surfaces of the inner block and the outer block are matched. Specifically, the stepped surfaces of the two are opposite to each other, and a certain gap is left in the middle. Therefore, a completely closed chamber and a cavity are formed between the two. A chamber with an opening at the top, which can be just closed by a pressure plate.

As the preferred technical solution:

Both the first chamber and the second chamber are provided with the elastic material member.

The elastic material member has an elastic buffering effect, and can absorb and absorb a part of the seismic energy, thereby reducing the impact effect of the external stopper.

As the preferred technical solution:

The first chamber and the second chamber are both provided with the fluid material member, the pressing plate is provided with a first drainage hole, and the first drainage hole is communicated with the first chamber ;

The outer block is provided with a second drainage hole, and the second drainage hole communicates with the second chamber.

The first drainage hole is used to communicate the first chamber with the outside, and the second drainage hole is used to communicate the second chamber with the outside, so as to facilitate the oil bag to be squeezed and ruptured Afterwards, the fluid buffer material overflows the blocking space through the first drainage hole and the second drainage hole to provide a second section of rigidity for the structure.

As the preferred technical solution:

The elastic material member is arranged in the first chamber, and the fluid material member is arranged in the second chamber;

Or the fluid material member is arranged in the first chamber, and the elastic material member is arranged in the second chamber.

In the present invention, two materials can be combined and arranged in the first chamber and the second chamber respectively. The chamber where the elastic material member is arranged does not need to have a drain hole, and the chamber where the fluid material member is arranged corresponds to Just open the drain hole.

As the preferred technical solution:

The fluid material member is arranged in the second chamber, the first chamber and the second chamber are communicated with each other through a communication hole, the pressing plate is provided with a first drain hole, and the first A drain hole communicates with the first chamber.

The fluid material member is only arranged in the second chamber, and after the oil bag is squeezed and ruptured, the fluid buffer material enters the first chamber through the communication hole, and is then discharged from the first drainage hole. In the above process, the stiffness of the first segment is the stiffness before the shear pin is broken, the stiffness of the second segment is the stiffness of the fluid buffer material discharged from the second chamber to the first chamber when the second chamber is loaded, and the third segment is Stiffness is the stiffness at which the first chamber and the second chamber simultaneously carry the fluid cushioning material out of the structure. The above three sections of stiffness increase the safety of the structure.

As the preferred technical solution:

The shear pin is arranged through the outer block, the inner block and the lower support plate in sequence.

As the preferred technical solution:

The upper support plate and the lower support plate can be connected to the external structure through anchors, or can be directly connected to the external structure, such as welding, etc. The upper support plate is used to connect with the beam body, and the The lower support plate is used to connect with the abutment.

As the preferred technical solution:

The lower support plate is provided with a mirror-surface stainless steel plate, and the mirror-surface stainless steel plate and the flat sliding plate form a sliding pair.

To sum up, due to the adoption of the above-mentioned technical solutions, the beneficial effects of the present invention are:

The earthquake identification type impact-resistant bearing of the present invention is provided with an inner stopper and an outer stopper, that is, a two-level limit protection structure. Under special conditions such as earthquakes, the beam body is displaced in the upward direction of the transverse bridge. The inner block and the outer block resist upwards on the transverse bridge to avoid dangerous situations such as falling beams. A shear pin is connected between the inner stop and the lower support plate, and the stiffness of the shear pin before breaking is used as the first segment stiffness of the structure, which has a certain impact resistance, but if the inner stop is subjected to When the impact force exceeds the strength of the shear pin, the shear pin is broken, and the inner stopper will impact the outer stopper. The present invention is arranged between the inner stopper and the outer stopper. The cavity, a buffer is arranged in the cavity, therefore, there is no rigid sliding area between the inner block and the outer block. The displacement process can effectively buffer, reduce the impact on the outer block, reduce the impact load on the outer block, prevent the outer block from being damaged by impact, and improve the safety performance of the bridge structure.

Description of drawings

FIG. 1 is a schematic structural diagram of the earthquake identification type shock-resistant bearing according to Embodiment 1 of the present invention.

FIG. 2 is a schematic structural diagram of the earthquake identification type shock-resistant bearing according to Embodiment 2 of the present invention.

FIG. 3 is a schematic structural diagram of the earthquake identification type impact-resistant bearing according to Embodiment 3 of the present invention.

FIG. 4 is a schematic structural diagram of the earthquake identification type shock-resistant bearing according to Embodiment 4 of the present invention.

Icons: 1- Upper bearing plate, 2- Spherical crown lining plate, 3- Lower bearing plate, 4- Spherical sliding plate, 5- Flat sliding plate, 6- Mirror stainless steel plate, 7- Anchor, 8- Inner stop, 9-outer block, 10-step surface, 11-first chamber, 12-second chamber, 13-elastic material member, 14-fluid material member, 15-rotating sleeve, 16-pressing plate, 17-shear force Pin, 18-first drain hole, 19-second drain hole, 20-communication hole.

Detailed ways

In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, not all examples. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

As shown in FIG. 1 , this embodiment proposes an earthquake identification type impact-resistant bearing, which includes an upper bearing plate 1 , a spherical crown lining plate 2 , and a lower bearing plate 3 arranged in sequence from top to bottom. A spherical sliding plate 4 is arranged between the seat plate 1 and the spherical crown lining plate 2, the spherical sliding plate 4 is located in the groove on the upper support plate 1, and the spherical sliding plate 4 is connected to the spherical crown lining plate. A rotating pair is formed between 2, and a flat sliding plate 5 is arranged between the spherical crown lining plate 2 and the lower support plate 3, and the flat sliding plate 5 is located in the stop on the spherical crown lining plate 2. The A mirror-surface stainless steel plate 6 is fixed on the lower support plate 3 , and the mirror-surface stainless steel plate 6 and the flat sliding plate 5 form a sliding pair.

The upper support plate 1 and the lower support plate 3 can be connected to the external structure through anchors 7, or can be directly connected to the external structure, such as welding, etc. The upper support plate 1 is used for connecting with the beam body. connection, the lower support plate 3 is used to connect with the abutment.

The lower support plate 3 is provided with an inner stopper 8 and an outer stopper 9 on both sides of the transverse bridge upward, and the inner stopper 8 is located between the upper support plate 1 and the outer stopper 9 , that is, the inner block 8 is closer to the upper support plate 1 than the outer block 9 is. Under special conditions such as earthquakes, the beam body is displaced in the upward direction of the transverse bridge, and is resisted in the upward direction of the transverse bridge by the inner block 8 and the outer block 9 to avoid dangerous situations such as falling beams.

A shear pin 17 is connected between the inner block 8 and the lower support plate 3 , and the shear pin 17 passes through the outer block 9 , the inner block 8 , and the lower support in sequence. Seat plate 3 set.

In order to avoid the force concentration of the inner stopper 8 and the shear pin 17 from breaking in the design state, a rotating sleeve 15 is provided between the inner stopper 8 and the upper support plate 1 . 15 is sleeved on the outer side of the upper support plate 1 .

The top of the inner block 8 is connected with a pressure plate 16 , the pressure plate 16 partially protrudes from the side of the inner block 8 and is crimped on the top of the rotating sleeve 15 for limiting the rotating sleeve 15 . In this embodiment, the pressing plate 16 and the inner block 8 are connected by bolts.

The inner block 8 and the outer block 9 are both provided with two steps, the step surfaces 10 of the two are oppositely arranged, and there is a certain distance between them, the outer block 9 and the The inner block 8 is matched to form a cavity with an open top and a completely closed cavity, which are the first cavity 11 and the second cavity 12 respectively. The second chamber 12 is closer to the upper support plate 1 , and the top of the first chamber 11 is closed by the pressing plate 16 .

Both the first chamber 11 and the second chamber 12 are provided with elastic material members 13, and the elastic material members 13 are rubber, steel dome and the like. The elastic material member 13 has an elastic buffering effect, and can absorb and absorb a part of the seismic energy, thereby reducing the impact of the outer block 9 .

Since the shear pin 17 is connected between the inner block 8 and the lower support plate 3, the stiffness of the shear pin 17 before breaking is used as the first segment stiffness of the structure, and has a certain impact resistance, but if the shear pin 17 is broken When the impact force on the inner block 8 exceeds the strength of the shear pin 17, the shear pin 17 is broken, and the inner block 8 will impact the outer block 9. Therefore, the shear pin 17 can control the timing of work. Since the elastic material member 13 is provided between the inner stopper 8 and the outer stopper 9, there is no rigid sliding area between the inner stopper 8 and the outer stopper 9. The elastic material member 13, as the second rigidity of the structure, can effectively buffer and reduce the impact on the outer stopper 9 during the displacement of the outer stopper 9 after the inner stopper 8 fails. The impact load of the outer block 9 improves the safety performance of the bridge structure.

The earthquake identification type shock-resistant bearing provided in this embodiment can realize damping characteristics, velocity-related characteristics, and buffering characteristics between the inner block 8 and the outer block 9 to reduce the load on the outer block 9 under special conditions such as earthquakes. shock.

Example 2

The difference between this embodiment and Embodiment 1 is:

As shown in FIG. 2 , both the first chamber 11 and the second chamber 12 are provided with a fluid material member 14 , and the fluid material member 14 includes an oil bag filled with a fluid buffer material. , the oil sac is squeezed and ruptured. The fluid buffer material is wrapped with an oil bag design to avoid loss under normal conditions. The fluid buffer material is silicone oil, hydraulic oil and the like.

The pressing plate 16 is provided with a first drain hole 18, and the first drain hole 18 is communicated with the first chamber 11; the outer block 9 is provided with a second drain hole 19, so The second drain hole 19 communicates with the second chamber 12 . The first drainage hole 18 is used to communicate the first chamber 11 with the outside of the block, and the second drainage hole 19 is used to communicate the second chamber 12 with the outside of the block. It is convenient that after the oil bag is squeezed and ruptured, the fluid buffer material flows out of the blocking space through the first drainage hole 18 and the second drainage hole 19, so as to provide a second section of rigidity for the structure.

Under special conditions such as earthquakes, when the inner stopper 8 fails, the inner stopper 8 impacts the outer stopper 9, and the oil bag between the two is crushed under pressure, and the fluid buffer material in it flows into the chamber, and due to the pressure , the fluid buffer material in the chamber is discharged from the first discharge hole 18 and the second discharge hole 19 to realize the external flow of the fluid buffer material, then, the second stiffness is the first chamber The chamber 11 and the second chamber 12 simultaneously carry the stiffness for expelling the fluid buffer material out of the structure.

Example 3

The difference between this embodiment and Embodiment 2 is:

As shown in FIG. 3 , the elastic material member 13 is arranged in the first chamber 11 , and the fluid material member 14 is arranged in the second chamber 12 ; in this embodiment, the components of the two materials are combined, They are respectively arranged in the first chamber 11 and the second chamber 12. In this embodiment, since the elastic material member 13 is arranged in the first chamber 11, there is no need to open the The first drain hole 18 .

Of course, the fluid material member 14 may also be arranged in the first chamber 11 , and the elastic material member 13 may be arranged in the second chamber 12 . The chamber in which the elastic material member 13 is provided does not need to be provided with a drain hole, and the chamber in which the fluid material member 14 is provided may be provided with a drain hole correspondingly.

Example 4

The difference between this embodiment and Embodiment 2 is:

As shown in FIG. 4 , the second drain hole 19 in Embodiment 2 is cancelled, and only the first drain hole 18 is opened on the pressing plate 16 , and the first drain hole 18 is connected to the first chamber 11 . The first drainage hole 18 communicates the first chamber 11 with the outside of the block.

The first chamber 11 and the second chamber 12 communicate with each other through a communication hole 20 , and only the second chamber 12 is provided with the fluid material member 14 .

Since the first chamber 11 and the second chamber 12 are in communication, after the inner stopper 8 fails, the inner stopper 8 will move towards the outer stopper 9, and the The oil bag in the second chamber 12 is squeezed. After the oil bag is ruptured, the fluid buffer material will flow into the first chamber 11 from the second chamber 12 , and then flow out of the first chamber 11 through the first drain hole 18 . The first chamber 11 discharges the block.

Therefore, the three-stage stiffness of the structure can be obtained as follows: the first-stage stiffness is the stiffness before the shear pin 17 breaks, and the second-stage stiffness is when the second chamber 12 is loaded with the fluid buffer material discharged from the second chamber 12 to the first The stiffness of the chamber 11, the third stiffness is that the first chamber 11 and the second chamber 12 simultaneously carry the stiffness to discharge the fluid buffer material to the outside of the structure. The above three sections of stiffness increase the safety of the structure.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims (10)

1. An earthquake identification type impact-resistant bearing, comprising an upper bearing plate, a spherical crown lining plate, and a lower bearing plate arranged in sequence from top to bottom, and between the upper bearing plate and the spherical crown lining plate A spherical sliding plate is provided, and a plane sliding plate is arranged between the spherical crown lining plate and the lower support plate, and is characterized in that: The lower support plate is provided with an inner block and an outer block on both sides in the upward direction of the transverse bridge, and the inner block is located between the upper support plate and the outer block; A shear pin is connected between the inner block and the lower support plate; A cavity is formed between the inner block and the outer block, and a buffer is accommodated in the cavity. 2. earthquake identification type shock-resistant bearing according to claim 1 is characterized in that: A rotating sleeve is disposed between the inner block and the upper support plate, and the rotating sleeve is sleeved on the outer side of the upper support plate. 3. earthquake identification type shock-resistant bearing according to claim 2 is characterized in that: A pressure plate is connected to the top of the inner block, and the pressure plate is partially extended from the inner block and is crimped to the top of the rotating sleeve. 4. The earthquake identification type shock-resistant bearing according to claim 3 is characterized in that: The buffer member is an elastic material member or a fluid material member. 5. The earthquake identification type shock-resistant bearing according to claim 4 is characterized in that: The fluid material member includes an oil bag filled with a fluid buffer material, and the oil bag is broken when squeezed. 6. The earthquake identification type shock-resistant bearing according to claim 5 is characterized in that: Both the inner block and the outer block are provided with two steps, the stepped surfaces of the two are arranged oppositely, the outer block is matched with the inner block, and two cavities are formed between the two. chambers, respectively a first chamber and a second chamber, the top of the first chamber being closed by the pressure plate. 7. The earthquake identification type shock-resistant bearing according to claim 6 is characterized in that: Both the first chamber and the second chamber are provided with the elastic material member. 8. The earthquake identification type shock-resistant bearing according to claim 6 is characterized in that: The first chamber and the second chamber are both provided with the fluid material member, the pressing plate is provided with a first drainage hole, and the first drainage hole is communicated with the first chamber ; The outer block is provided with a second drainage hole, and the second drainage hole communicates with the second chamber. 9. The earthquake identification type shock-resistant bearing according to claim 6 is characterized in that: The elastic material member is arranged in the first chamber, and the fluid material member is arranged in the second chamber; Or the fluid material member is arranged in the first chamber, and the elastic material member is arranged in the second chamber. 10. The earthquake identification type shock-resistant bearing according to claim 6 is characterized in that: The fluid material member is arranged in the second chamber, the first chamber and the second chamber are communicated with each other through a communication hole, the pressing plate is provided with a first drain hole, and the first A drain hole communicates with the first chamber.

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