Post-earthquake low-damage self-resetting double-column high pier with replaceable rotating coupling beam

Abstract

The invention discloses a post-earthquake low-damage self-resetting double-column type high pier with a replaceable rotating coupling beam, and belongs to the technical field of earthquake resistance and shock absorption in bridge engineering. The double-column type high pier structure comprises a double-column type high pier used for supporting a bridge, the connecting positions of the upper ends and the lower ends of two pier bodies in the double-column type high pier and a bridge structure are each provided with a set of energy dissipation reinforcing steel bars, the double-column type high pier conducts stretching plastic deformation energy dissipation through the energy dissipation reinforcing steel bars, and the self-resetting effect is achieved through unbonded prestressed tendons; the two pier bodies are connected through a replaceable rotating coupling beam device, the rotating coupling beam device comprises connecting pieces, and the two connecting pieces are connected through a rotatable connecting structure and a wedge-shaped face clamping structure so as to achieve vibration energy dissipation and self-resetting. According to the structure, the function can be recovered after an earthquake; according to the structure, the overall stress performance of the bridge is optimized, the requirement for rapid construction is met, it is guaranteed that the overall structure is not damaged after an earthquake, and the pre-earthquake state can be rapidly recovered only by replacing related energy dissipation components.

Description

Technical Field

[0001] The invention belongs to the technical field of earthquake resistance and shock absorption in bridge engineering, and in particular relates to a post-earthquake low-damage self-resetting double-column high pier with a replaceable rotating connecting beam. Background Art

[0002] In recent years, as my country's bridge seismic design and construction technology has gradually moved towards a new stage of intelligence, standardization and prefabrication, the current bridge seismic design specifications have basically achieved the seismic fortification goal of "no damage in small earthquakes, repairable in medium earthquakes, and no collapse in large earthquakes". However, with the rapid development of the economy and the continuous advancement of urbanization, the construction of transportation abutment facilities is accelerating, especially in the context of the continuous rise of a large number of modern urban agglomerations with dense populations and concentrated wealth. The high concentration of such urban agglomerations has made earthquake disaster prevention face greater vulnerability problems, which has become an important challenge that needs to be addressed urgently. As an important part of urban transportation hub projects, whether bridges can be quickly restored to use after an earthquake directly affects the efficiency and effectiveness of the entire city's post-earthquake rescue and emergency response, and is of vital significance.

[0003] In order to minimize the interference of bridge damage on urban traffic functions after earthquakes and ensure the smooth progress of disaster relief transportation and reconstruction work, the seismic fortification goal of "not collapsing in strong earthquakes" alone can no longer meet the actual needs of modern society for bridge seismic performance. Therefore, the bridge design concept urgently needs to change from a single "anti-collapse" to "structural post-earthquake functional recovery". In order to meet the development needs of future recoverable cities, many scholars have begun to promote the application of self-resetting energy-absorbing bridge piers. At present, the design of self-resetting bridge piers mainly relies on prestressed tendons and energy-absorbing devices at the top and bottom of the piers to achieve the post-earthquake self-resetting effect and dissipate earthquake energy to achieve the purpose of rapid functional recovery. Therefore, how to achieve both rapid functional recovery of bridge structures after earthquakes and rapid repair of damage has become a key technical problem that technicians in this field urgently need to overcome.

[0004] Based on the above background, a structure suitable for prefabricated construction and equipped with replaceable rotating connecting beams was invented for double-column high piers, which can achieve post-earthquake functional recovery. This structure not only optimizes the overall stress performance of the bridge and meets the needs of rapid construction, but also ensures that the overall structure is not damaged after the earthquake, and can be quickly restored to the pre-earthquake state by simply replacing relevant energy-consuming components. Summary of the invention

[0005] In view of the above-mentioned problems existing in the prior art, the purpose of the present invention is to provide a post-earthquake low-damage self-resetting double-column high pier with a replaceable rotating connecting beam, which can improve the seismic performance and post-earthquake self-resetting ability of the high pier bridge structure, and provide protection for the safety and stability of transportation pier facilities.

[0006] The present invention provides the following technical solutions: a post-earthquake low-damage self-resetting double-column high pier with a replaceable rotating connecting beam, comprising a double-column high pier for supporting a bridge, wherein a group of energy-absorbing steel bars are provided at the connection between the upper and lower ends of the two pier bodies of the double-column high pier and the bridge structure, the double-column high pier is stretched and plastically deformed to absorb vibration energy through the arranged energy-absorbing steel bars, and self-resetting is achieved through the unbonded prestressed tendons arranged through the pier body; the connecting beam sections on the two pier bodies are connected by a replaceable rotating connecting beam device, the rotating connecting beam device comprises connecting parts correspondingly connected to the two pier bodies, and the two connecting parts are connected by a vertically arranged rotatable connecting structure and a transversely arranged wedge-shaped surface clamping structure fastened by spring combination bolts to achieve transverse vibration energy absorption and self-resetting.

[0007] Furthermore, the bottom of the double-column high pier is arranged on a pedestal, and a cap beam is arranged on the top; a group of energy-absorbing steel bars are arranged between the pier body of the double-column high pier, the cap beam and the pedestal.

[0008] Furthermore, the unbonded prestressed tendons are passed through the pier body, and both ends thereof pass through the cap beam and the pedestal respectively and are tensioned and fixed by prestressed anchors.

[0009] Furthermore, both ends of the pier body are wrapped with steel pipe protective sleeves, and steel plates are embedded in the connection between the ends of the two ends and the cap beam and the pedestal.

[0010] Furthermore, the connecting member includes an embedded steel plate and a connecting plate. The embedded steel plate is embedded in the connecting beam section in the middle of the pier body, and the connecting plate is vertically arranged on the embedded steel plate. The connecting plates on the two connecting members are connected by pins and fasteners to form a rotatable connecting structure, so that the two connecting members fit together and can rotate vertically.

[0011] Furthermore, a central clamping plate is transversely arranged on each of the connecting members, and the corresponding central clamping plates on both sides are connected by a cover plate and a spring combination bolt.

[0012] Furthermore, wedge-shaped planes are provided on both sides of the central clamping plate, and a wedge-shaped surface structure matching with the wedge-shaped planes is provided on the cover plate.

[0013] Furthermore, the spring combination bolt includes a screw rod penetrating the center clamping plate and the cover plate, a nut arranged on the screw rod, and a spring arranged between the nut and the end surface of the cover plate during tightening and installation.

[0014] By adopting the above technology, compared with the prior art, the beneficial effects of the present invention are as follows:

[0015] (1) The present invention introduces a replaceable rotating connecting beam device between the double pier connecting beams and utilizes its internal energy dissipation mechanism to significantly reduce the damage caused by earthquakes to the main structure of the bridge piers and improve the overall seismic performance of the bridge.

[0016] (2) The present invention combines the dual self-resetting effects of spring combination bolts and unbonded prestressed tendon post-tensioning system to ensure that the bridge piers can quickly return to their initial positions after an earthquake, thus efficiently achieving post-earthquake self-resetting.

[0017] (3) In the present invention, the deformation of the pier body is concentrated on the opening of the end joint and the rotation of the replaceable rotating connecting beam device, thereby ensuring that the pier body is in elastic deformation. The steel pipe constraint at the end of the pier body and the replaceable type of the damaged parts of the connecting beam avoid large-scale repair of the pier, achieve low damage characteristics, and also improve maintenance efficiency and flexibility.

[0018] (4) In the present invention, the double-column high pier adopts the pier body segment prefabrication construction technology, and the pier body is a steel-concrete combination at the end and a reinforced concrete structure in the middle. The main body can be prefabricated in the factory and assembled on the construction site, which greatly shortens the construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an overall schematic diagram of an embodiment of the present invention;

[0020] Figure 2 is a schematic diagram of the structure of a replaceable rotating connecting beam device in an embodiment of the present invention;

[0021] Figure 3 is a schematic diagram of the structure of an arc-shaped connecting member in an embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the combined structure of the center splint and the cover plate in an embodiment of the present invention;

[0023] Figure 5 Schematic diagram of the structure of the elastic fastener in an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments of the specification. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] On the contrary, the present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention as defined by the claims. Further, in order to make the public have a better understanding of the present invention, some specific details are described in detail in the detailed description of the present invention below. Those skilled in the art can fully understand the present invention without the description of these details.

[0026] Example:

[0027] like Figure 1 As shown, a post-earthquake low-damage self-resetting double-column high pier with replaceable rotating connecting beams of the present invention comprises a double-column high pier 1, a cap beam 2, a cap 3, a non-energy-consuming connecting beam section 4 arranged on the high pier 1, and a replaceable rotating connecting beam device 5. All components are prefabricated in the factory and assembled on site.

[0028] Unbonded prestressed steel bars 7 and energy-absorbing steel bars 8 are used at both ends of the two piers in the high pier 1 to realize the self-reset capability and energy dissipation of the structure; and the connecting beam section 4 is designed with a replaceable rotating self-reset device 5, which can also realize the self-reset and energy dissipation functions. The two self-reset and energy dissipation designs can effectively ensure that the double-column high pier 1 can achieve the low residual requirement after an earthquake.

[0029] Specifically, the bottom of each pier body is arranged on the cap 3, and the cap beam 2 is erected on the top of the pier body.

[0030] At the positions where the ends of the pier body are connected to the cap beam 2 and the abutment 3, conventional low-carbon steel bars are built in around the cross section of the pier body as energy-absorbing steel bars 8 to dissipate seismic energy.

[0031] PVC channels are provided in the internal structures of the pier body, cap beam 2 and pedestal 3, in which unbonded prestressed tendons 7 are arranged. Both ends of the unbonded prestressed tendons 7 are fixed by post-tensioning method through prestressed anchors 6, so as to give the overall structure the ability of self-resetting.

[0032] The top and bottom of the pier body are wrapped with a layer of steel pipe protective sleeve 9 to form a local steel pipe concrete section, and the connection parts between the cap beam 2, the abutment 3 and the pier body are embedded with steel plates 10 to avoid local crushing of concrete in the end swing compression zone and ensure that the steel bars in the compression zone do not undergo unconstrained buckling, so as to achieve the low damage characteristics of the swing end.

[0033] Specifically, two connecting beam sections 4 are arranged at intervals in the middle of the pier body, and the corresponding connecting beam sections 4 on the two pier bodies are connected via a replaceable rotating connecting beam device 5 .

[0034] like Figure 2 As shown, the replaceable rotating connecting beam device 5 includes two connecting members 51, a central clamping plate 52 and a cover plate 53. The two connecting members 51 are respectively connected to the connecting beam 4 on the corresponding high pier 1, and the two connecting members 51 are rotatably connected by a pin 13 and a high-strength bolt 14; a central clamping plate 52 is transversely arranged on each connecting member 51, and the central clamping plates 52 of the connecting members 51 on both sides are connected by a cover plate 53 and a spring combination bolt.

[0035] like Figure 3As shown, the connecting member 51 includes an embedded steel plate 511, a stud 12, a vertically arranged connecting steel plate 512 and a fixing plate 513. The embedded steel plate 511 and the stud 12 are embedded in the side wing of the non-energy absorbing connecting beam section 4 before pouring, and the two connecting steel plates 512 are welded to the embedded steel plate 511 and fixed by the fixing plate 513 to form a whole.

[0036] A circular reserved hole 514 is provided at a corresponding position on the single-piece connecting steel plate 512, and the circular reserved hole 514 includes a circular pin hole and four waist-shaped bolt holes. The overall structure is prefabricated in a factory and embedded before pouring.

[0037] like Figure 4 As shown, the central splint 52 has bolts connected to one side, and a waist-shaped bolt hole 521 is reserved on the other side; the cover plate has a circular bolt hole 531. The junction between the central splint 52 and the cover plate 53 is a continuous wedge-shaped surface to increase the friction energy dissipation and self-reset ability between the steel plates.

[0038] like Figure 5 As shown, the spring combination bolt includes a screw rod 111 that passes through the center clamping plate 52 and the cover plate 53, a nut 112 that is arranged on the screw rod 111, and a spring 113 that is arranged between the nut 112 and the end surface of the cover plate 53 during tightening and installation. The spring 113 can enhance the self-resetting ability of the replaceable rotating connecting beam.

[0039] The working principle of the structure of this embodiment is as follows:

[0040] The structure and design concept of this embodiment integrates the elastic self-resetting and shock-absorbing energy-dissipating mechanisms of the self-resetting pier system, and applies it to the field of earthquake resistance and shock absorption technology in bridge engineering.

[0041] Under the action of lateral earthquake, relative lateral displacement will occur between the two piers of the double-column high pier 1, and the connecting beam section 4 between the two piers will be deformed, and the replaceable rotating connecting beam device 5 can adapt to this deformation. At this time, the connecting member 51 in the replaceable rotating connecting beam device 5 is under pressure through the pin shaft 13 and the high-strength bolt 14 in its hinge structure, and induces relative friction rotation, thereby realizing effective dissipation of earthquake energy.

[0042] At the same time, the wedge-shaped surfaces of the central clamping plate 52 and the cover plate in close contact with each other slide relative to each other, further promoting the dissipation of energy; and the rebound effect of the spring combination screw 11 realizes the self-resetting function of the rotation of the device.

[0043] In addition, the post-tensioning system of the unbonded prestressed tendons 7 of the pier body can effectively control the swinging motion of the bridge pier and enhance the self-reset performance of the structure. The energy-absorbing steel bars 8 arranged between the pier top and the cap beam, and between the pier bottom and the pedestal can also increase the energy-absorbing capacity of the structure. The steel plates 10 and the steel pipe protective sleeves 9 can effectively protect the concrete in the key area of ​​the pier end from damage when the end of the swinging pressure-bearing surface contacts.

[0044] Based on the above structural design, it is ensured that the entire double-column high pier maintains a low-damage state after the earthquake and has self-reset capability, and the overall performance of the structure can be quickly restored by replacing the damaged parts in the rotating coupling beam device 5 at the damaged coupling beam section.

[0045] The specific construction steps of the structure of this embodiment are as follows:

[0046] S1. Before installing the bridge pier, the predetermined position needs to be treated with a cap to ensure that the high pier 1 can be installed stably and firmly.

[0047] S2. The construction of the cap 3 is cast on site. At the same time, a PVC pipe is pre-installed on the central axis of the double-column high pier 1, and a metal corrugated pipe is pre-buried around it. In addition, a steel plate 10 is embedded in the connection between the cap 3 and the double-column high pier 1, and drilling is performed at the required position.

[0048] S3. After the processing of the foundation is completed, the segments of the double-column high pier 1 are placed one by one, and energy-absorbing steel bars 8 are placed at the bottom of the pier and grouting is performed to fill the joints to ensure the density and durability of the joints.

[0049] S4. After the segments of the pier body are installed to the pier top, a cap beam 2 is set up on the top of the pier body, and a steel plate 10 is embedded in the connection area between the cap beam 2 and the pier body. Similarly, holes need to be drilled in the center and corresponding positions around the steel plate 10 at the pier top to reserve channels for the unbonded prestressed tendons 7 and energy-absorbing steel bars 8.

[0050] S5. The unbonded prestressed tendons 7 are passed through from the bottom to the top of the pier body, and the two ends are preliminarily tensioned and fixed by prestressed anchors 6. The energy-absorbing steel bars 8 at the top are placed in the reserved metal corrugated pipe holes in the cap beam 2 and grouted to ensure the density and durability of the joints.

[0051] S6. The connecting piece 51 is connected by a pin 13 and a high-strength bolt 14 to construct a hinge-type connection part, thereby realizing rotational friction and component pressure to dissipate energy. At the same time, with the help of the upper and lower cover plates 53 and the tightening effect of the spring combination bolt 11, the close fit between the central clamping plate 52 and the cover plate 53 is enhanced, thereby inducing sliding friction to dissipate energy, and achieving a self-reset effect through the spring and wedge-shaped part.

[0052] S7, tensioning unbonded prestressed tendons 7, the magnitude of the prestress is determined according to the anti-overturning moment required under the design earthquake action to provide the pier with self-resetting ability.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A post-earthquake low-damage self-resetting double-column high pier with replaceable rotating connecting beams, characterized in that: The invention comprises a double-column high pier (1) for supporting a bridge, wherein a group of energy-absorbing steel bars (8) are provided at the connection points between the upper and lower ends of the two pier bodies of the double-column high pier (1) and the bridge structure, and the double-column high pier (1) is stretched, plastically deformed and vibrated to dissipate energy through the energy-absorbing steel bars (8), and self-reset is achieved through the unbonded prestressed bars (7) arranged through the pier body; the connecting beam sections (4) on the two pier bodies are connected through a replaceable rotating connecting beam device (5), and the rotating connecting beam device (5) comprises connecting members (51) correspondingly connected to the two pier bodies, and the two connecting members (51) are connected through a vertically arranged rotatable connecting structure and a wedge-shaped surface clamping structure arranged horizontally and fastened by a spring combination bolt (11) to achieve vibration energy dissipation and self-reset.

2. A post-earthquake low-damage self-resetting double-column high pier with replaceable rotating connecting beams according to claim 1, characterized in that: The bottom of the double-column high pier (1) is arranged on a capping platform (3), and a cap beam (2) is arranged on the top of the double-column high pier (1); a group of energy-absorbing steel bars (8) are arranged between the pier body of the double-column high pier (1), the cap beam (2) and the capping platform (3).

3. The post-earthquake low-damage self-resetting double-column high pier with replaceable rotating connecting beam according to claim 2, characterized in that: The unbonded prestressed tendons (7) are inserted into the pier body, and the two ends thereof respectively pass through the cap beam (2) and the pedestal (3) and are tensioned and fixed by prestressed anchors (6).

4. A post-earthquake low-damage self-resetting double-column high pier with replaceable rotating connecting beams according to claim 2 or 3, characterized in that: Both ends of the pier body are wrapped with steel pipe protective sleeves (9), and steel plates (10) are embedded in the connection between the ends of the two ends and the cap beam (2) and the pedestal (3).

5. The post-earthquake low-damage self-resetting double-column high pier with replaceable rotating connecting beam according to claim 2, characterized in that: The connecting member (51) comprises an embedded steel plate (511) and a connecting plate (512); the embedded steel plate (511) is embedded in a connecting beam section (4) in the middle of the pier body; the connecting plate (512) is vertically arranged on the embedded steel plate (511); the connecting plates (512) on the two connecting members (51) are connected via a pin shaft (13) and a fastener (14) to form a rotatable connection structure, so that the two connecting members (51) fit each other and can be vertically rotated.

6. The post-earthquake low-damage self-resetting double-column high pier with replaceable rotating connecting beams according to claim 5, characterized in that: A central clamping plate (52) is transversely arranged on each of the connecting members (51), and the corresponding central clamping plates (52) on both sides are connected via a cover plate (53) and a spring combination bolt (11).

7. The post-earthquake low-damage self-resetting double-column high pier with replaceable rotating connecting beams according to claim 6, characterized in that: Wedge-shaped planes are provided on both sides of the central clamping plate (52), and a wedge-shaped surface structure matching the wedge-shaped planes is provided on the cover plate (53).

8. The post-earthquake low-damage self-resetting double-column high pier with replaceable rotating connecting beams according to claim 7, characterized in that: The spring combination bolt comprises a screw rod (111) penetrating a central clamping plate (52) and a cover plate (53), a nut (112) arranged on the screw rod (111), and a spring (113) arranged between the nut (112) and the end surface of the cover plate (53) during fastening and installation.

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