Friction pendulum seismic mitigation and isolation inhaul cable steel support capable of being jacked steplessly and continuously

Abstract

The invention discloses a stepless continuous jacking friction pendulum seismic mitigation and isolation inhaul cable steel support, which comprises a support top plate and a support bottom plate, and is characterized in that a support adjusting mechanism consisting of a support upper top plate, a wedge block, a sizing block and a non-slip block is arranged on the support top plate, so that the height of the support is continuously increased or decreased in a stepless manner; an inclined face with the middle gradually increasing towards the two baffles is arranged in a top plate on the support. The wedge block is a sliding block of which the top surface is an inclined surface which is gradually reduced from the middle to two sides and is matched with the inclined surface of the top plate on the support; the sizing block is arranged between the two wedge blocks; the non-slip block is arranged on the outer side of the wedge block; according to the support, the positions of the wedge block and the inclined plane of the top plate on the support are adjusted through the sizing block and the non-slip block, and the height of the support is adjusted. Compared with the prior art, the device has the advantages that the height of the support is continuously increased or decreased in a stepless mode, the structure is simple, the device can be used on the friction pendulum seismic mitigation and isolation support and can also be used on supports of any other forms, the construction cost is reduced, and the device has good application prospects.

Description

Technical Field

[0001] This invention relates to the field of bridge vibration damping bearing technology, and in particular to a friction pendulum vibration damping and isolation cable steel bearing that can be continuously lifted steplessly. Background Technology

[0002] Friction pendulum seismic isolation bearings are a type of seismic isolation and energy dissipation bearing widely used in bridge engineering, industrial and civil buildings both domestically and internationally. They possess advantages such as a clear seismic isolation mechanism, simple structure, high load-bearing capacity, and convenient installation, and are increasingly recognized by the engineering community. Friction pendulum seismic isolation bearings have become an industry standard. Currently, friction pendulum seismic isolation bearings generally do not have built-in stepless continuous jacking devices and high-strength steel wire rope cables, which fails to meet the seismic design code requirement that bridges should have "effective displacement constraints to reliably control structural displacement during earthquakes and prevent beam collapse," thus failing to achieve the seismic isolation and energy dissipation function during earthquakes.

[0003] Typically, large-tonnage friction pendulum seismic isolation bearings have a service life of over fifty years. However, in certain situations, such as unexpected earthquakes damaging the bearings, uneven settlement of the bridge foundation requiring adjustments to the bridge elevation, or premature damage to the bearings due to improper maintenance necessitating replacement or repair, it becomes necessary to erect large-scale scaffolding around the bearings. This scaffolding must also withstand enormous loads to ensure the safety of construction workers and the bridge itself. Erecting large, sturdy scaffolding not only incurs significant manpower, material, and financial costs but also severely impacts traffic on or under the bridge.

[0004] In summary, existing friction pendulum seismic isolation bearings cannot meet the seismic isolation and energy dissipation functions when bridge foundations experience uneven settlement or earthquakes. This leads to premature damage to the seismic isolation bearings, resulting in significant manpower, material and financial resources being spent on repairing or replacing the bearings, or adjusting the bridge elevation, as well as the erection of large-scale scaffolding. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a friction pendulum seismic isolation cable bearing that can be continuously and steplessly lifted. The bearing adjustment mechanism consists of a top plate, wedges, and several pads and stop blocks of different moduli and thicknesses, enabling stepless and continuous lifting of the bearing height. This mechanism utilizes the change in the relative position of two sliding inclined wedges to achieve stepless and continuous height adjustment. Because the load on the upper part of the bearing is quite large, the change in the relative position of the two sliding inclined wedges is implemented using flat jacks. This invention has a simple structure, is easy to manufacture and install, and effectively solves the problem of needing to erect large-scale scaffolding when replacing, repairing, or adjusting bridge elevation. This makes construction more convenient and faster, reduces construction costs, further improves construction safety, and has good application prospects.

[0006] The objective of this invention is achieved as follows: a friction pendulum seismic isolation cable-stayed steel support capable of stepless continuous lifting, comprising a top plate, a steel wire rope, a bottom plate, a seismic retaining ring, a spherical pendulum, and a spherical liner. The spherical pendulum is mounted on the bottom plate by the seismic retaining ring, which is fixed to the bottom plate with screws. A spherical liner is provided between the top plate and the spherical pendulum. The key feature is that the top plate of the support includes an upper top plate, a sliding wedge, and several shims and anti-slip blocks, forming a stepless continuous lifting mechanism. The support adjustment mechanism comprises a top plate of the support with baffles on both sides, the thickness of which gradually increases from the middle to the two baffles on an inclined surface; two slidable wedges are two slidable metal blocks disposed under the top plate of the support, the top surface of which is an inclined surface that gradually decreases from the middle to both sides, and slides in accordance with the slope of the inclined surface inside the top plate of the support, and the bottom surface is a flat surface that slides in accordance with the top plate of the support; and several metal plates are disposed between the two slidable wedges, the width of which is smaller than the width of the slidable wedges on both sides. The space formed by the width difference is the first position for placing the lifting tool; the stop block consists of several metal plates disposed on the outside of the two slidable wedges, the width of which is smaller than the width of the slidable wedges, and the space formed by the width difference is the second position for placing the lifting tool; the support top plate has two grooves; the two grooves are symmetrically disposed at both ends of the support top plate; the baffles on both sides of the support top plate have protruding keys that match the grooves; the protruding keys fit into the grooves to form a shear-resistant key pin structure; the two ends of the wire rope are... The anchorages are anchored to the top plate and bottom plate of the support, respectively. The friction pendulum type seismic isolation support uses several shims and anti-slip blocks to adjust the relative position between the sliding wedge and the inclined surface of the top plate of the support, thereby adjusting the height of the friction pendulum type seismic isolation support. The adjustment of the relative position between the sliding wedge and the inclined surface of the top plate of the support is implemented by using a flat jack set in the first or second position, and using several shims and anti-slip blocks to fix it in the locked position, thereby adjusting the height of the friction pendulum type seismic isolation support.

[0007] The sliding wedge is provided with a first friction pair and a second friction pair on its upper and lower sides, respectively, so that the wedge can slide between the upper plate of the support and the top plate of the support to facilitate adjustment of the height of the friction pendulum vibration damping and isolation support.

[0008] The pad and the stop block are composed of several metal sheets with different moduli and thicknesses.

[0009] The pad and the stop block are interchangeable components with the same shape and size. When the height position is locked after the support is adjusted, the stop block and the pad can be interchanged or replaced as needed.

[0010] Compared with the prior art, the present invention has the following beneficial technical effects and significant technical advancements: 1) The structure is simple, not only easy to process and manufacture, but also quick and convenient to install and adjust the height. The added self-lifting device does not affect the normal basic function of the friction pendulum seismic isolation bearing and the seismic isolation and energy dissipation function during an earthquake.

[0011] 2) It effectively solves the problem of having to erect large-scale scaffolding when replacing or repairing bearings or adjusting bridge elevation, making construction more convenient and faster, reducing construction costs, and further improving construction safety.

[0012] 3) Shear clamps are installed at the lower part of the baffles on both sides of the top plate. The shear clamps and the grooves on the top plate form anti-shear clamps. The shear clamps serve to fix the support adjustment device and resist the horizontal force on the support.

[0013] 4) High-strength steel wire ropes are installed at appropriate locations on the supports to connect the upper and lower parts of the supports. Since the upper and lower parts of the supports are connected to the bridge structure, once the displacement caused by an earthquake reaches or is about to exceed the set value, the steel wire ropes will limit the excessive displacement of the supports to ensure that no beam collapse occurs.

[0014] 5) The relative position of the top plate and the sliding wedge is changed using a flat jack. Changing the relative position of the flat jack changes the adjustment method. Several shims and stop blocks of different module thicknesses are used to maintain and fix the adjusted height. This fixing method is reliable and ensures safety. The different module thicknesses not only meet the needs of continuous stepless adjustment, but also allow the stop blocks and shims to be interchanged or used interchangeably as needed.

[0015] 6) The top plate of the inclined support and the sliding inclined wedge are equipped with friction pairs with low coefficient of friction at their contact points. The contact surface between the sliding wedge and the top plate of the support is also equipped with a sliding friction pair with low coefficient of friction. As needed, the sliding inclined wedge can slide within the top plate of the inclined support and between the top plate of the support. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 for Figure 1 Section II; Figure 3 This is a schematic diagram of the support lifting in Example 1. Detailed Implementation

[0017] See Figure 1 The present invention includes a friction pendulum type seismic isolation bearing composed of a top plate 11, a steel wire rope 12, a bottom plate 13, a seismic retaining ring 16, a spherical pendulum 17, and a spherical liner 18. The spherical pendulum 17 is mounted on the bottom plate 13 by the seismic retaining ring 16, and the seismic retaining ring 16 is fixed to the bottom plate 13 by screws. A spherical liner 18 is provided between the top plate 11 and the spherical pendulum 17. The top plate 11 is provided with an upper top plate 1 and a sliding wedge 3, as well as several shims 4 and anti-slip blocks 5 to form a stepless connection. The support adjustment mechanism for continuous lifting includes a top plate 1 on the support with baffles 8 on both sides, the thickness of which gradually increases from the middle to the two baffles 8; the slidable wedges 3 are two slidable metal blocks set under the top plate 1 of the support, the top surface of which is a slope that gradually decreases from the middle to both sides, and is slidably engaged with the slope of the slope inside the top plate 1 of the support; the bottom surface of the slidable wedges 3 is flat and is slidably engaged with the top plate 11 of the support; the shims 4 are several different types of shims set between the two slidable wedges 3. The support consists of rectangular metal sheets of different modulus thicknesses; the stop block 5 is a rectangular metal sheet of different modulus thicknesses disposed on the outer sides of the two wedges 3; the support top plate 11 has two grooves 10, symmetrically disposed at both ends of the support top plate 11; the baffles 8 on both sides of the support top plate 1 have protruding keys 9 that match the grooves 10; the protruding keys 9 fit into the grooves 10 to form a shear-resistant key-pin structure, which serves to fix the support adjustment device and resist the horizontal force on the support; the steel wire rope 12 is anchored at both ends. The fixture 19 is anchored to the top plate 1 and the bottom plate 13 of the support, respectively. The friction pendulum type vibration isolation support uses several modulus thickness pads 4 and stop blocks 5 to adjust the relative position between the slidable wedge 3 and the inclined surface of the top plate 1 of the support, thereby adjusting the height of the friction pendulum type vibration isolation support. The upper and lower parts of the slidable wedge 3 are respectively provided with a first friction pair 2 and a second friction pair 7. The wedge 3 is slidably engaged with the top plate 1 and the top plate 11 of the support to facilitate the adjustment of the height of the friction pendulum type vibration isolation support.

[0018] See Figure 2The shim 4 consists of several rectangular metal sheets of different modulus thicknesses placed between the two sliding wedges 3. The width of the shim 4 is smaller than the width of the sliding wedges 3, and the space formed by the width difference is the first position 15 for placing the lifting tool. The stop block 5 consists of rectangular metal sheets of different modulus thicknesses placed on the outer sides of the two wedges 3. The width of the stop block 5 is smaller than the width of the sliding wedges 3, and the space formed by the width difference is the second position 6 for placing the lifting tool. Due to the presence of the inclined surface, the vertical load acting on the support will generate a horizontal force on the two friction pairs above and below the sliding wedges 3. This horizontal force will cause the two sliding wedges 3 to be compressed towards the center. Because the shim 4 is placed between the two sliding wedges 3, this compressive force will not cause the sliding wedges 3 to slide towards the center. The main function of the shim 4 is to prevent the sliding wedges 3 from sliding towards the center under the action of the upper vertical load. Both sliding wedges 3 have stop blocks 5 on their outer sides. The sliding wedges 3 are firmly fixed in the locked position by the shims 4 and the stop blocks 5. Specifically, the main function of the shims 4 and the stop blocks 5 is to firmly fix the position of the sliding wedges 3.

[0019] The pad 4 and the stop block 5 are interchangeable components with the same shape and size. When the height position is locked after the support is adjusted, the stop block 5 and the pad 4 can be interchanged or mutually complementary as needed.

[0020] This invention relates to a novel multifunctional friction pendulum seismic isolation bearing, which adds a stepless continuous lifting mechanism and a high-strength steel wire rope to a conventional friction pendulum type seismic isolation bearing. The bearing adjustment mechanism utilizes the relative position changes of two additional sliding wedges 3 with inclined surfaces to achieve stepless continuous height adjustment or lowering. Because the load on the upper part of the bearing is quite large, the change in the relative position of the two sliding wedges 3 is implemented using a flat jack located at either the first position 15 or the second position 6.

[0021] This invention relates to a support installed under a bridge structure. This type of support is typically used in extra-large bridges and statically indeterminate continuous beam structures. It acts like a joint, transferring the loads and deformations of the bridge superstructure to the piers and ultimately the foundation. In statically indeterminate continuous beam bridges, uneven settlement of the foundation can generate harmful secondary internal forces on the superstructure, causing the bridge's stress state to deviate from the design specifications. This severely impacts the bridge's driving comfort, service life, and safety, requiring timely correction. This invention utilizes a built-in stepless continuous lifting mechanism to raise or lower the support, quickly eliminating the hazards of uneven settlement. The installation of this invention is similar to that of ordinary friction pendulum seismic isolation steel bearings. After factory fabrication, the entire assembly is transported to the designated location on the construction site for installation. Disassembly of the support is not permitted during installation. After the support is placed on the pier, bridge components are placed on the support in sections, and then the sections are assembled into a whole, completing the support installation. In the initial stage of bridge construction, the bearings do not require adjustment; adjustments are only made after major natural disasters or unexpected events. A typical friction pendulum type seismic isolation bearing mainly consists of a bearing base plate 13, a seismic retaining ring 16, a spherical pendulum 17, a spherical liner 18, and a bearing top plate 11. The adjustment mechanism of this invention is located on the bearing top plate 11. The bearing base plate 13 primarily bears the load and deformation transmitted from the bridge superstructure. Another important function of the bearing base plate 13 is that after an earthquake, when the seismic retaining ring 16 breaks, the spherical pendulum 17 will perform pendulum-like reciprocating motion on the bearing base plate 13, thus reducing seismic intensity and dissipating energy, protecting the bridge. The high-strength steel wire rope 12 and anchorages 19 on the bearing are the main components connecting the upper and lower parts of the bearing. Since the upper part of the support is connected to the bridge structure and the lower part of the support is connected to the pier, once the displacement caused by the seismic force reaches or is about to exceed the set value, the steel wire rope 12 will limit the excessive displacement of the support to ensure that the support does not collapse, thereby avoiding the occurrence of beam collapse.

[0022] The invention will be further described below with specific examples of raising or lowering the support.

[0023] Example 1 See Figure 3The invention is used as follows: When the support needs to be raised, a lifting tool, namely a flat jack 20, can be placed at the first position 15 at both ends of the sliding wedge 3. Simultaneously, a certain thickness of stop block 5 is removed according to the required height adjustment (the slope of the sliding wedge 3 and the inclined surface of the top plate 1 of the support, as designed in this invention, is such that for every 50mm movement of the sliding wedge 3, the support height changes by 12mm). Then, the flat jack 20 is activated, causing the sliding wedge 3 to move a certain distance, filling the gap left at the shim 4 after the flat jack 20 has been raised. Since the gap left at the shim 4 after the flat jack 20 has been raised has the same thickness as the removed stop block 5, the stop block 5 and the shim 4 can still effectively fix the position of the sliding wedge 3. The support height adjustment is thus completed. Conversely, to lower the support height, the operation is reversed. Place the flat jack 20 at the second position 6 at both ends of the stop block 5, and remove shims 4 of a certain thickness as needed for the required reduction. Start the flat jack 20 and push the sliding wedge 3 a certain distance. Then, replace the removed shims 4 into the gap left at the stop block 5 after the flat jack 20 is lifted. The support lowering work is now complete.

[0024] The above embodiments are merely illustrative of the present invention and are not intended to limit the scope of the present invention. Any equivalent implementations of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A friction pendulum seismic isolation cable-stayed steel support capable of stepless continuous lifting, comprising a friction pendulum type seismic isolation support consisting of a support top plate, a support bottom plate, a steel wire rope, and a spherical pendulum, wherein the spherical pendulum is mounted on the support bottom plate by an anti-seismic retaining ring, the anti-seismic retaining ring being fixed to the support bottom plate by screws, and a spherical liner plate being provided between the support top plate and the spherical pendulum, characterized in that... The support top plate is equipped with a support top plate, sliding wedges, several shims, and stop blocks, forming a stepless continuous lifting support adjustment mechanism. The support top plate is a cover plate with baffles on both sides, and its thickness gradually increases from the middle to the two baffles. The sliding wedges are two sliding metal blocks set under the support top plate. Their top surfaces are slopes that gradually decrease from the middle to both sides, and slide in a manner matching the slope of the slope inside the support top plate. Their bottom surfaces are flat and slide in a manner matching the support top plate. The shims are several metal pieces set between the two sliding wedges. The width of the shims on both sides is smaller than the width of the sliding wedges. The space formed by the width difference is the first position for placing the lifting tool. The shims are clearance-fitted with the sliding wedges on both sides. The stop blocks are several metal pieces set on the outside of the two sliding wedges. The width of the shims on both sides is smaller than the width of the sliding wedges. The width difference between the two is the second position for placing the lifting tool. The anti-sliding block and the sliding wedge are in clearance fit. The top plate of the support has two grooves, which are symmetrically arranged at both ends of the top plate of the support. The baffles on both sides of the top plate of the support have protruding keys that match the grooves. The protruding keys and the grooves fit together to form a shear-resistant key pin structure. The two ends of the wire rope are anchored to the top plate of the support and the bottom plate of the support, respectively. The friction pendulum type vibration isolation support uses several shims and anti-sliding blocks to adjust the relative position between the sliding wedge and the inclined surface of the top plate of the support to adjust the height of the support. The adjustment of the relative position between the sliding wedge and the inclined surface of the top plate of the support is carried out by setting a flat jack at the first or second position, and locking the adjusted position with several shims and anti-sliding blocks to adjust the height of the friction pendulum type vibration isolation support.

2. The friction pendulum seismic isolation cable support with stepless continuous lifting capability according to claim 1, characterized in that, The sliding wedge is provided with a first friction pair and a second friction pair with a low coefficient of friction on its upper and lower sides, respectively.

3. The friction pendulum shock-absorbing and isolation cable steel support capable of stepless continuous lifting according to claim 1 or claim 2, characterized in that, The pad and the stop block are composed of several metal sheets with different moduli and thicknesses.

4. The friction pendulum shock-absorbing and isolation cable steel support capable of stepless continuous lifting according to claim 1 or claim 3, characterized in that, The pad and the stop block are interchangeable components with the same shape and size.

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