A limited self-resetting railway swing hollow bridge pier with built-in corrugated web damper

Abstract

The present invention discloses a limited self-resetting railway swaying hollow pier with a built-in corrugated web damper. The bottom of the round-end hollow pier body is assembled with the installation foundation. The bottom of the inner cavity of the hollow pier body is provided with a corrugated web damper along the transverse direction of the bridge. The lower end of the corrugated web damper is hinged to the foundation through a tie rod. When the pier sways, the corrugated web damper dissipates energy to reduce the input of seismic energy. A strut assembly is arranged directly above the corrugated web damper to improve the shear resistance of the pier and the integrity of the pier. Unbonded prestressed steel bars are anchored between the axial center of the pier bottom and the foundation, so that the pier can be lifted off the sway under the action of an earthquake to avoid damage to the pier structure. The swaying amplitude is limited to a certain extent, so that the pier has a certain post-earthquake self-resetting function. The provision of the corrugated web damper can also improve the shear resistance of the pier to a certain extent.

Description

Technical Field

[0001] The invention belongs to the field of bridge engineering earthquake resistance, and in particular relates to a limited self-resetting railway rocking hollow bridge pier with a built-in corrugated web damper. Background Art

[0002] Bridges account for a large proportion of high-speed railways, making them irreplaceable in rail transportation. The current seismic design of bridges is mainly based on the concept of ductile seismic resistance, which dissipates seismic energy by setting plastic hinges to produce plastic deformation. However, this design method will produce large residual displacements after an earthquake and is prone to severe local damage. Bridges with structural damage can only be repaired by demolition and reconstruction, which causes great economic losses and slows down the repair speed.

[0003] The damaged bridges after the earthquake not only lost their rail transit capacity, but also seriously delayed network transportation, bringing great difficulties to the repair and reconstruction work, and the rescue and emergency channels in the disaster area would be blocked. Bridge piers are the main load-bearing components of bridges, and are also the main energy-consuming components during earthquakes. They are one of the important components of bridge earthquake resistance. Avoiding the breakage of bridge piers can effectively prevent bridge collapse.

[0004] A swaying pier structure with damage control and self-reset capabilities has been developed. It can prevent the bridge from collapsing in a major earthquake, and can resume normal use after an earthquake without repair or with only a little repair. The swaying pier can reduce the lateral stiffness of the structure and extend the self-seismic period of the structure to achieve a seismic isolation effect, but it has poor shear resistance and integrity. At the same time, the deadweight of the upper structure and the prestressed beams provide the pier with self-reset capability, and the residual displacement is reduced. However, the swaying pier has poor energy dissipation capacity during earthquakes, and additional dampers are often required when swaying. The dampers are set externally, which are not only prone to human damage, but also have a service life affected by environmental factors. Summary of the invention

[0005] The purpose of the present invention is to provide a limited self-resetting railway swing hollow bridge pier with strong shear resistance, good integrity and built-in corrugated web damper to ensure that the bridge pier avoids damage to its own structure when encountering a large earthquake.

[0006] The limited self-resetting railway rocking hollow bridge pier with built-in corrugated web damper provided by the present invention has a round-end hollow pier body bottom that is assembled with an installation foundation, a corrugated web damper is arranged along the transverse direction of the bridge at the bottom of the inner cavity of the hollow pier body, the lower end of the corrugated web damper is hinged to the foundation through a pull rod, and a support rod assembly is arranged directly above the corrugated web damper; non-bonded prestressed steel bars are anchored between the axial center of the pier bottom and the foundation.

[0007] In one embodiment of the above-mentioned bridge pier, the bottom of the pier body is a solid section, the middle part of the bottom surface of the solid section is a downward convex arc-shaped boss, the bottom surfaces of the pier walls on both sides of the arc-shaped boss are upwardly converging arc surfaces, and a fiber concrete support seat is cast between the arc surface and the installation foundation.

[0008] In one embodiment of the above-mentioned bridge pier, steel strands are arranged between the outer walls at both transverse ends of the pier bottom and the foundation.

[0009] In one embodiment of the above-mentioned bridge pier, the upper end surface of the pier body is a plane, and is provided with a rubber bearing and a shock-absorbing tenon. The steel tenon body of the shock-absorbing tenon is an integral part of a conical support body and an upper spherical body. The spherical body and the conical support body are respectively provided with a tenon and a bottom plate. The bottom plate is fixed to the upper end surface of the pier body by bolts, and the tenon is fixed to the bottom surface of the structural box beam above the pier body by fasteners.

[0010] In one embodiment of the above-mentioned pier, the corrugated web damper includes a corrugated web, a mounting box and a clamping plate. The mounting box is a rectangular plate box, and its inner cavity width is greater than the total thickness of the corrugated section of the corrugated web. The clamping plate can be slid up and down and inserted into the bottom of the mounting box. The extension direction of the corrugated web is set in the vertical direction. The corrugated web is placed in the inner cavity of the mounting box, and the top is suspended by bolts passing through the mounting box. The bottom is clamped by the clamping plate and connected by bolts passing through the corrugated web. Connectors with outer surfaces matching the arc surface of the inner wall of the circular end of the pier body are symmetrically extended on both sides of the upper end of the mounting box.

[0011] In one embodiment of the above-mentioned bridge pier, the corrugated web has two pieces arranged side by side on the left and right, and their lower ends are respectively clamped and fixed by the clamping plates.

[0012] In one embodiment of the above-mentioned bridge pier, the outer wall of the clamping plate and the inner wall of the bottom of the inner cavity of the installation box are assembled through an embedded vertical tooth plate surface, a limit block is provided at the upper end of the clamping plate, and stop blocks are provided on both sides of the bottom of the installation box.

[0013] In one embodiment of the above-mentioned pier, the corrugated web damper includes a corrugated web and a mounting frame. The mounting frame is an inverted U-shaped frame, and a circle of rectangular grooves is arranged on its inner wall. The lower ends of the rectangular grooves on the two side arms are blind ends, and the width of the rectangular grooves is greater than the total thickness of the corrugated sections of the corrugated web. The extension direction of the corrugated web is arranged in the vertical direction, and two corrugated webs arranged side by side on the left and right are placed in the rectangular grooves, and the top is suspended by bolts passing through the mounting frame; connectors whose outer surfaces match the arc surfaces of the inner walls of the round ends of the pier bodies are symmetrically extended on both sides of the upper end of the mounting frame.

[0014] In one embodiment of the above-mentioned bridge pier, the strut assembly includes steel struts and mounting seats, the steel struts include multiple horizontal struts and diagonal struts between them, the mounting seat is a π-shaped seat, and the outer wall of its end plate is an arc that matches the inner wall of the hollow pier body; the end plate of the mounting seat is fixed to the circular end side wall of the pier body by bolts, and the ends of the horizontal struts and the diagonal struts are respectively hinged to the mounting seat by bolts.

[0015] The present invention anchors unbonded prestressed steel bars between the pier bottom and the foundation, so that the pier can be lifted and swung under the action of an earthquake to avoid damage to the pier structure, and the swaying amplitude is limited to a certain extent, so that the pier has a certain post-earthquake self-reset function. A corrugated web damper is arranged at the bottom of the inner cavity of the hollow pier body, and the corrugated web damper is connected to the foundation through a tie rod. When the pier sways, the corrugated web damper dissipates energy to reduce the input of seismic energy. A strut assembly is arranged above the corrugated web damper in the pier body to improve the shear resistance of the pier and the integrity of the pier. Of course, the arrangement of the corrugated web damper can also improve the shear resistance of the pier to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic cross-sectional view of the transverse bridge structure of the first embodiment of the present invention.

[0017] Figure 2 for Figure 1 Schematic diagram of the cross-section along line AA in FIG.

[0018] Figure 3 for Figure 1 Schematic diagram of the axonometric structure of the medium corrugated web damper.

[0019] Figure 4 for Figure 3 Schematic diagram of the structure after removing the installation box.

[0020] Figure 5 for Figure 1 Schematic diagram of the structure of the center support rod assembly.

[0021] Figure 6 for Figure 5 Schematic diagram of the exploded structure of the assembly of the middle horizontal brace and the diagonal brace with the mounting base.

[0022] Figure 7 Schematic diagram of the function of the steel strands between the outer wall of the pier bottom and the foundation in this embodiment.

[0023] Figure 8 It is a schematic diagram of the axonometric structure of the corrugated web damper in the second embodiment of the present invention. DETAILED DESCRIPTION

[0024] Embodiment 1: Figure 1As shown, the limited self-resetting railway rocking hollow bridge pier with built-in corrugated web damper disclosed in this embodiment mainly includes a hollow pier body 1, a corrugated web damper 2, a horizontal strut 3, an oblique strut 4, a mounting seat 5, a tie rod 6, a fiber concrete support seat 7, a cast-in-place foundation 8, unbonded prestressed steel bars 9, a steel strand 10, a shock-absorbing tenon 11 and a rubber bearing 12.

[0025] After combination Figure 1 , Figure 2 It can be seen that the two ends of the transverse bridge of the hollow pier body 1 are round ends, and a corrugated web damper 2 is fixed at the bottom of the transverse bridge center plane in its inner cavity. A strut assembly assembled by horizontal struts 3, diagonal struts 4 and mounting seats 5 through fasteners is arranged above the corrugated web damper 2.

[0026] After combination Figure 2 , Figure 3 It can be seen that the corrugated web damper 2 includes a corrugated web 21, a mounting box 22 and a clamping plate 23. The mounting box 22 is a rectangular plate box, the width of the inner cavity of which is slightly larger than the total thickness of the corrugated section of the corrugated web 21, and the clamping plate 23 can be slidably inserted at the bottom of the mounting box 22: the outer wall of the clamping plate and the inner wall of the bottom of the inner cavity of the mounting box are assembled by an interlocking rectangular toothed plate surface, a limit block is set at the upper end of the clamping plate, and stoppers are set on both sides of the bottom of the mounting box.

[0027] The corrugations of the corrugated web 21 are arranged in the horizontal direction so that the corrugated web can be expanded and contracted in the vertical direction.

[0028] When the corrugated web damper 2 is assembled, two corrugated webs 21 are placed side by side in the inner cavity of the installation box 22, the top is suspended by high-strength bolts that penetrate the installation box 22, and the bottom is clamped by a pair of clamps 23 and fixed by high-strength bolts that penetrate. When the pier sways under the action of an earthquake, and the displacement of the left and right sides at the same height in the pier is inconsistent, which may cause damage to the pier structure, this problem can be effectively solved by the independent movement of the two corrugated webs. When the corrugated web needs to be replaced after the earthquake, the operation is convenient and quick.

[0029] Connectors with outer surfaces matching the arc surface of the inner wall of the round end of the pier body extend symmetrically from both sides of the upper end of the installation box 22, and the connectors are fixed to the inner wall by high-strength bolts.

[0030] Combination Figure 1 , Figure 5 and Figure 6 It can be seen that there are multiple horizontal braces 3 arranged in parallel and at equal intervals, and mounting seats 5 are respectively arranged at both ends of each horizontal brace. The mounting seat 5 is a π-shaped seat, and the outer wall of its end plate is an arc that matches the inner wall of the circular end of the pier body. Diagonal braces 4 are arranged between each horizontal brace 3, and the two ends of the diagonal braces 4 and the horizontal braces 3 are respectively plugged into the corresponding mounting seats 5 through rectangular ear plates and then hinged by bolts.

[0031] The end plate of the mounting seat 5 is fixed to the inner wall of the circular end of the pier body by high-strength bolts, and the support rod assembly is arranged in a semi-meter shape on the transverse center plane of the hollow pier body.

[0032] The strut assembly can effectively transfer the shear force of the structural box girder at the upper end of the pier body, improve the shear resistance of the joints of the prefabricated piers and the integrity of the piers, and solve the problems of weak shear resistance and poor integrity of traditional hollow piers.

[0033] from Figure 1 It can be seen that the lower end of the corrugated web damper 2 is connected to the cast-in-place foundation of the hollow pier body through the tie rods 6 on both sides, and the lower edge of the clamping plate 23 of the corrugated web damper 2 is symmetrically connected with ear plates for connecting the tie rods 6. As an energy dissipation device, the corrugated web damper dissipates seismic energy through the structure of the corrugated web itself, and can also improve the shear resistance of the hollow pier to a certain extent.

[0034] The bottom of the hollow pier body 1 has a solid section, the middle part of the bottom surface of the solid section is a downward convex arc boss, the bottom surfaces of the pier walls on both sides of the arc boss are upwardly contracted arc surfaces, and a fiber concrete support seat 7 is cast between the arc surface and the installation foundation.

[0035] The axial center of the solid section at the bottom of the pier is connected to the cast-in-place foundation 8 through unbonded prestressed steel bars 9 and anchors, and the tie rod 6 passes through the solid section and the cast-in-place foundation. That is, mounting holes for unbonded prestressed steel bars 9 and tie rod 6 are respectively provided on the solid section and the cast-in-place foundation.

[0036] Steel strands 10 are symmetrically hinged between the outer wall of the circular end of the hollow pier body 1 and the cast-in-place foundation.

[0037] The top surface of the hollow pier body 1 is a plane, and is provided with a shock-absorbing tenon 11 and a rubber bearing 12. The steel tenon body of the shock-absorbing tenon 11 is an integral part of a conical support body and an upper spherical body, and the spherical body and the conical support body are respectively provided with a tenon and a bottom plate, the bottom plate is fixed to the upper end surface of the pier body by bolts, and the tenon is fixed to the bottom surface of the structural box beam above the pier body by fasteners.

[0038] The hollow pier body of this embodiment can be cast in situ in sections or prefabricated in a factory in sections, and the installation foundation of the hollow pier body is cast in situ.

[0039] The construction process of the segmented cast-in-place hollow pier is as follows:

[0040] (1) During foundation pouring, holes are reserved for installing unbonded prestressed steel bars and tie rods to connect the pier bottom and the corrugated web damper to the foundation. Note that the diameter of the holes used to install unbonded prestressed steel bars only needs to be considered for ease of installation, while the diameter of the holes used to install tie rods also needs to consider the space for the tie rods to follow the pier body swaying during an earthquake.

[0041] (2) After the curing period of the foundation concrete is over, fiber concrete is poured. Fiber concrete has certain strength and toughness, and can support the piers during normal use. Compared with different concretes, it is not easy to be crushed when the piers swing and collide with each other. When the fiber concrete is poured, the outer surface should be flush with the pier wall, and the inner surface should be a circular arc surface that matches the round end of the pier bottom. In this way, when the fiber concrete is crushed in a medium or large earthquake, the pier can swing smoothly with the circular arc surface embedded in the foundation, increasing the contact surface area during swinging.

[0042] (3) Cast the pier bottom section, middle section and pier top section in sequence

[0043] The pier bottom section is cast according to the designed shape, and after forming, it is embedded with the foundation and the fiber concrete molded body. After the pier bottom section is cured, the tie rod, unbonded prestressed steel bars and corrugated web damper are installed, and the upper end of the tie rod is connected to the corrugated web damper. The steel strand is installed between the outer wall of the circular end of the pier bottom and the foundation;

[0044] During the pouring of the middle section, each support rod is installed in sequence according to the actual situation;

[0045] When pouring the pier top section, reserve an inspection hole, and install the shock-absorbing tenon and rubber bearing after pouring.

[0046] That is, the components are installed and fixed after the corresponding casting sections of the hollow pier are formed.

[0047] When the hollow pier body is prefabricated in sections in the factory, after the prefabrication of each section of the pier body is completed, it is installed and fixed according to the designed position of the built-in structural parts. That is, the built-in structure is installed in the factory, and only the sections need to be spliced ​​and the splicing seams need to be cast on site.

[0048] The energy dissipation principle of the corrugated web damper of the above structure is as follows:

[0049] There are baffles on both sides of the crest and trough of the corrugated web, which are consistent with the tensile and compressive deformation direction. In normal use, the corrugated web does not contact the baffles. The bottoms of the two corrugated webs are clamped by a pair of clamps respectively, and can be stretched and contracted separately during deformation. Moreover, the bottom of the installation box and the clamps are meshed through the vertical rectangular tooth plate surface, so the corrugated web can only undergo vertical stretching movement when the clamps slide up and down, and there will be no horizontal displacement relative to the baffle. In addition, the vertical stretching of the corrugated web has an upper limit and a lower limit, which can prevent the clamps from being pulled out of the installation box when the stretching displacement is too large, or the entire clamp is embedded in the baffle when compressed. That is, the structure of the installation box can ensure that the corrugated web can achieve tensile and compressive energy consumption within the set range.

[0050] Specifically, when the pier sways under the action of an earthquake, the upper end of the installation box of the corrugated web damper is fixed to the inner wall of the pier body and moves with the pier, while the pull rod between the lower end of the corrugated web damper and the foundation can cause the baffle of the installation box of the corrugated web damper and the plywood at its bottom to produce an upward and downward relative displacement. Since the baffle is connected to the upper end of the corrugated web and the plywood is connected to the lower end of the corrugated web, the upward and downward relative displacement of the baffle and the plywood can cause the corrugated web to produce vertical tensile or compressive deformation, thereby achieving energy dissipation. When the corrugated web is compressed to a certain extent, the front and rear baffles of the installation box can limit the outward bulging of the crests and troughs of the corrugated web to avoid excessive deformation, and can also improve the overall shear bearing capacity of the corrugated web damper. The corrugated web damper uses two side-by-side corrugated webs inside. On the one hand, it can ensure that the two corrugated webs can move independently with the left and right sides of the pier to stretch and compress respectively, and on the other hand, it can facilitate the replacement of damaged structures after the earthquake. The shape and size of the corrugated web can be selected according to the needs. The shape of the corrugation includes sine wave shape and square wave shape, but it is necessary to ensure that the extension direction of the corrugated web is vertical. The use of corrugated web enhances its out-of-plane stability and shear resistance, and overcomes the disadvantage of flat steel plate that it is easy to buckle out-of-plane.

[0051] The restoring force of the unbonded prestressed steel bars installed between the axial center of the bottom of the hollow pier and the foundation can be used to achieve self-reset of the pier, reduce or eliminate residual displacement of the bridge structure after an earthquake, and enable rapid traffic after a disaster.

[0052] The steel strands installed between the outer wall of the round end of the pier and the foundation can prevent the pier from turning over at too large an angle during the swaying process, and at the same time ensure that the corrugated web damper built into the pier is not damaged. Figure 7 shown.

[0053] The shock-absorbing tenon at the top of the pier does not affect the normal use of the bridge bearing. At the same time, it bears the braking force and temperature force to a certain extent and is in an elastic state. In the event of an earthquake, the steel tenon of the shock-absorbing tenon will undergo plastic deformation, which absorbs the seismic energy on the one hand, and reduces the structural stiffness on the other hand, prolongs the natural vibration period of the structure, and reduces the seismic effect.

[0054] The specific working conditions of the bridge piers when encountering earthquakes of different degrees are as follows:

[0055] When a small earthquake occurs: When the earthquake wave reaches the bridge structure, the inertial force of the upper structure causes the steel tenons in the shock-absorbing tenons to undergo plastic deformation, which increases the structural damping ratio and consumes the energy input by the earthquake. At the same time, due to the reduction in stiffness, the structural period is extended, effectively avoiding the frequency range where the earthquake energy is concentrated.

[0056] During moderate or large earthquakes: Under moderate or large earthquakes, the seismic energy consumed by the yield of the steel tenons of the damping tenons is relatively small. At this time, the bottom of the pier sways, and the energy dissipation devices inside the hollow pier come into play. The horizontal force transmitted to the pier by the superstructure increases, and the pier is about to lift off and sway at the bottom. A relative displacement occurs between the foundation and the pier, and the bottom end of the damper is connected to the foundation through a foundation connecting rod, and the top end is fixed to the inner wall of the hollow pier by ordinary bolts. As the pier sways, the top and bottom ends of the corrugated web are relatively displaced, resulting in tensile or contraction deformation, and the deformation consumes the input energy of the earthquake. Taking the pier swinging to the right as an example, the working state of the pier is explained: when the pier swings to the right, the bottom of the left pier is lifted off, and the bottom of the left pier and the foundation are relatively displaced. Since two corrugated webs are placed side by side inside the corrugated web damper, the corrugated web on the left undergoes tensile deformation, and the corrugated web on the right undergoes compressive deformation, both of which dissipate seismic energy and avoid damage to the bridge structure caused by the earthquake. The same is true when the pier swings to the right. When the bridge pier sways, it collides with the foundation and crushes the fiber concrete. The bridge pier swings and lifts away along the arc section at the bottom, which further extends the bridge structure period and reduces the input of seismic energy. After the earthquake stops, the bridge pier resets itself under the action of the pier's own weight and the restoring force of the prestressed steel bars. Since the concrete structure of the bridge pier itself has not been damaged, it is only necessary to replace the crushed fiber concrete at the bottom and the deformed corrugated web.

[0057] In summary, this pier has the following advantages:

[0058] The corrugated web is innovatively proposed as a damper for energy-absorbing components. This structure can dissipate earthquake input energy by tensile and compressive deformation when the bridge pier swings. Compared with ordinary H-shaped steel plates, the corrugated web has greatly improved impact resistance, corrosion resistance and rust resistance, and has certain fire retardant capabilities. During construction, its later installation and processing are very convenient, with strong plasticity, and waveforms of different cross-sectional sizes can be designed according to the actual situation of the project.

[0059] The corrugated web damper is a boxed structure, and the bottoms of the two corrugated webs are fixed by clamps. When the pier swings and drives the corrugated webs to move up and down, a chiseled vertical track is set between the front and rear baffles of the installation box and the bottom clamp to ensure the stretching and compression direction of the corrugated webs. The clamp and the limit structure at its upper end can also prevent the corrugated webs from excessive deformation, playing a protective role.

[0060] Several steel struts are added inside the piers, arranged in a half-meter shape. These struts enhance the shear resistance of the hollow piers and improve the integrity of the piers. These rods themselves can also increase the overall stiffness of the piers and reduce damage to the piers during earthquake shaking.

[0061] Placing the steel struts and corrugated web dampers inside the hollow piers prevents environmental damage to these components and reduces daily maintenance costs. Moreover, compared with common hydraulic dampers and pulse dampers on the market, the corrugated web dampers will not leak or leak during normal use. The internal components of the hollow piers only function during earthquakes, further reducing daily maintenance costs.

[0062] The two-level protection structure enables the bridge piers to meet the design standard of "no damage in small earthquakes, repairable in medium earthquakes, and not collapsing in large earthquakes". Under the action of small earthquakes, the steel tenons of the shock-absorbing tenons yield to consume earthquake energy, while reducing the structural stiffness to extend the structural period and reduce earthquake damage. Under the action of medium and large earthquakes, the fiber concrete at the bottom of the piers is crushed, and the piers are lifted and swung along the arc section where the bottom and the foundation are embedded, further extending the structural period and dissipating earthquake energy. The steel strands between the pier bottom and the foundation can prevent the pier body from turning too far during the swinging process and overturning, and also ensure that the damper inside is not damaged. The main body of the pier will not be damaged after the earthquake, so it will not affect the recovery of the transportation system and the reconstruction of the disaster area after the earthquake.

[0063] Embodiment 2. The main difference between this embodiment and embodiment 1 is that the structure of the corrugated web damper built into the bottom of the pier body is different. The corrugated web damper 2 of this embodiment includes a corrugated web 21 and a mounting frame 24. The mounting frame 24 is an inverted U-shaped frame, and a circle of rectangular grooves is arranged on its inner wall. The lower ends of the rectangular groove sections on the two side arms are blind ends, so that the corrugated web can be limited downward to prevent the corrugated web 21 from being pulled out of the mounting frame 24. The width of the rectangular groove is greater than the total thickness of the corrugated section of the corrugated web 21. The corrugations of the corrugated web 21 are arranged in the horizontal direction, and the two corrugated webs arranged side by side on the left and right are placed in the rectangular groove, and the top is suspended by bolts passing through the mounting frame 24; the upper end of the mounting frame has symmetrically extending connectors on both sides, whose outer surfaces match the arc surface of the inner wall of the round end of the pier body, such as Figure 8 shown.

[0064] The bottom of the corrugated web 21 is connected to the tie rod 6 via high-strength bolts.

[0065] The other structures and assembly methods of this embodiment are the same as those of the first embodiment.

[0066] The corrugated web damper in Example 1 is best assembled during factory production. Compared with the corrugated web damper in Example 1, the cost is slightly higher. However, since the corrugated web is installed with a mounting plate box and a plywood, the protection of the corrugated web is stronger and the deformation range of the corrugated web is limited. The overall bearing capacity is higher than the corrugated web damper in the second embodiment, and it is more suitable for use in areas with high intensity.

[0067] The corrugated web damper in the second embodiment can be assembled on site, has low cost and is convenient for replacement after an earthquake, and is more suitable for areas with lower earthquake intensity.

[0068] Therefore, two structures of corrugated web dampers can be selected for application according to actual needs.

Claims

1. A limited self-resetting railway swing hollow bridge pier with a built-in corrugated web damper, characterized in that: The bottom of the hollow pier with round end is assembled with the installation foundation. The bottom of the inner cavity of the hollow pier is provided with a corrugated web damper along the transverse direction. The lower end of the corrugated web damper is hinged with the foundation through a tie rod. A support rod assembly is arranged directly above the corrugated web damper. Unbonded prestressed steel bars are anchored between the axial center of the pier bottom and the foundation. The corrugated web damper comprises a corrugated web, a mounting box and a clamping plate. The mounting box is a rectangular plate box, the width of its inner cavity is greater than the total thickness of the corrugated section of the corrugated web, the clamping plate can be slid up and down and inserted into the bottom of the mounting box, the corrugations of the corrugated web are arranged in the horizontal direction, the corrugated web is placed in the inner cavity of the mounting box, the top is suspended by bolts penetrating the mounting box, and the bottom is clamped by the clamping plate and connected by bolts penetrating the corrugated web; connectors with outer surfaces matching the arc surfaces of the inner wall of the circular end of the pier body are symmetrically extended on both sides of the upper end of the mounting box; the corrugated web has two pieces arranged side by side on the left and right, and their lower ends are respectively fixed by clamping the clamping plates; the outer wall of the clamping plate and the inner wall of the bottom of the inner cavity of the mounting box are assembled by means of a chimeric vertical toothed plate surface, a limit block is arranged at the upper end of the clamping plate, and stop blocks are arranged on both sides of the bottom of the mounting box; Alternatively, the corrugated web damper comprises a corrugated web and a mounting frame, wherein the mounting frame is an inverted U-shaped frame, and a circle of rectangular grooves is arranged on the inner wall thereof, the lower ends of the rectangular grooves on the two side arms are blind ends, the width of the rectangular grooves is greater than the total thickness of the corrugated sections of the corrugated web, the corrugations of the corrugated web are arranged in a horizontal direction, and two corrugated webs arranged side by side on the left and right are placed in the rectangular grooves, and the tops are suspended by bolts passing through the mounting frame; connectors whose outer surfaces match the arc surfaces of the inner walls of the round ends of the pier bodies are symmetrically extended on both sides of the upper end of the mounting frame.

2. The position-limited self-resetting railway rocking hollow bridge pier with built-in corrugated web damper as claimed in claim 1, characterized in that: The bottom of the pier body is a solid section, the middle part of the bottom surface of the solid section is a downward convex arc boss, the bottom surfaces of the pier walls on both sides of the arc boss are upwardly contracted arc surfaces, and a fiber concrete support seat is cast between the arc surface and the installation foundation.

3. The position-limited self-resetting railway rocking hollow bridge pier with built-in corrugated web damper as claimed in claim 2, characterized in that: Steel strands are arranged between the outer walls at both transverse ends of the pier bottom and the foundation.

4. The position-limited self-resetting railway rocking hollow bridge pier with built-in corrugated web damper as claimed in claim 1, characterized in that: The upper end surface of the pier body is a plane, and is provided with a rubber bearing and a shock-absorbing tenon. The steel tenon body of the shock-absorbing tenon is an integral part of a conical support body and an upper spherical body. The spherical body and the conical support body are respectively provided with a tenon and a bottom plate. The bottom plate is fixed to the upper end surface of the pier body by bolts, and the tenon is fixed to the bottom surface of the structural box beam above the pier body by fasteners.

5. The position-limited self-resetting railway rocking hollow bridge pier with built-in corrugated web damper as claimed in claim 1, characterized in that: The strut assembly includes a steel strut and a mounting seat. The steel strut includes multiple horizontal struts and diagonal struts between them. The mounting seat is a π-shaped seat, and the outer wall of its end plate is an arc that matches the inner wall of the hollow pier body. The end plate of the mounting seat is fixed to the circular end side wall of the pier body by bolts, and the ends of the horizontal struts and the diagonal struts are respectively hinged to the mounting seat by bolts.

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