Rigid hinge in midspan for rigid frame bridges resistant to fault dislocation

Abstract

The application discloses a rigid-jointed bridge for resisting fault dislocation, and relates to the technical field of bridges.The main girder of a rigid-jointed bridge on one side of the midspan is a first main girder, the main girder of a rigid-jointed bridge on the other side of the midspan is a second main girder, and the rigid-jointed bridge comprises a first supporting cross beam, a second supporting cross beam and a shockproof unit.The shockproof unit comprises a first fixing sleeve, a second fixing sleeve, a fixed pipe beam, a moving pipe beam and a safety ring.The first fixing sleeve is arranged in the first supporting cross beam, the moving pipe beam passes through the first fixing sleeve and is in sliding fit with the first fixing sleeve, and the first end of the moving pipe beam is fixedly connected with the first supporting cross beam.The second fixing sleeve is arranged in the second supporting cross beam, the fixed pipe beam passes through the second fixing sleeve, and the fixed pipe beam is fixedly connected with the second supporting cross beam.The fixed pipe beam and the moving pipe beam are fixedly connected with the safety ring.The rigid-jointed bridge can resist fault dislocation.

Description

A rigid frame bridge with a mid-span rigid hinge to resist fault slippage Technical Field

[0001] This invention relates to the field of bridge technology, and in particular to a mid-span rigid hinge for rigid frame bridges that resists fault displacement. Background Technology

[0002] A fault is a structural feature of the Earth's crust that fractures under stress, resulting in significant relative displacement of rock blocks on either side of the fracture surface. Faults vary in size, from large ones that can extend hundreds of kilometers along their strike and are often composed of many faults, forming a fault zone, to small ones that are only a few tens of centimeters in diameter. Faults are widely developed in the Earth's crust and are one of its most important structural features. Geomorphologically, large faults often form rift valleys and steep cliffs, such as the famous East African Rift Valley.

[0003] Bridges near or crossing faults face significant risks of near-fault earthquake damage, and seismic design codes for bridges stipulate the avoidance of constructing bridges that cross faults. While avoiding the construction of bridges that cross faults is the best practice to mitigate the risk of near-fault earthquake damage, it is not always feasible, especially in areas with dense networks of active faults.

[0004] A bridge whose span structure and piers are integrally connected is called a rigid frame bridge, also known as a rigid frame bridge. Because the main girder and two corresponding main piers of a rigid frame bridge are equivalent to a portal frame, the relative movement at the pier bases will cause significant secondary internal forces to the main girder and piers. The characteristics of fault ground motion, the crossing angle, and the crossing location all have a significant impact on the bridge's seismic response. Therefore, steel frame bridges spanning faults face a particularly greater risk of near-fault earthquake damage.

[0005] Currently, there are few designs for resisting fault displacement in rigid frame bridges spanning faults, and no relevant technologies have been found to enable rigid frame bridges to resist fault displacement. How to achieve resistance to fault displacement in rigid frame bridges is a technical problem that urgently needs to be solved in the field of bridge technology. Summary of the Invention

[0006] The purpose of this invention is to provide a mid-span rigid hinge for rigid frame bridges that resists fault displacement, so as to solve the problems existing in the prior art and realize the resistance of rigid frame bridges to fault displacement.

[0007] To achieve the above objectives, the present invention provides the following solution:

[0008] This invention provides a mid-span rigid hinge for rigid frame bridges to resist fault slippage. The main girder of the rigid frame bridge located on one side of the mid-span is a first main girder, and the main girder of the rigid frame bridge located on the other side of the mid-span is a second main girder, comprising:

[0009] A first supporting transverse beam, one end of which is fixedly connected to the end of the first main beam near the middle of the span;

[0010] A second supporting transverse beam, one end of which is fixedly connected to the end of the second main beam near the middle of the span;

[0011] The seismic-resistant unit includes a first fixed sleeve, a second fixed sleeve, a fixed pipe beam, a movable pipe beam, and a safety ring. The axial directions of the first fixed sleeve, the second fixed sleeve, the fixed pipe beam, the movable pipe beam, and the safety ring are all the same as the longitudinal direction of the rigid frame bridge. The first fixed sleeve is disposed within the first supporting transverse beam, the movable pipe beam passes through the first fixed sleeve and is slidably fitted with the first fixed sleeve, and the first end of the movable pipe beam is fixedly connected to the first supporting transverse beam. The second fixed sleeve is disposed within the second supporting transverse beam, the fixed pipe beam passes through the second fixed sleeve, and the fixed pipe beam is fixedly connected to the second supporting transverse beam. The safety ring is located between the fixed pipe beam and the movable pipe beam, and the second ends of the fixed pipe beam and the movable pipe beam are respectively fixedly connected to the safety ring.

[0012] Preferably, the yield point of both the fixed tube beam and the movable tube beam is higher than the yield point of the safety ring, and the ring width of the safety ring is 0.5m-1m.

[0013] Preferably, it further includes a telescopic connecting beam located between the first supporting crossbeam and the second supporting crossbeam, one end of the telescopic connecting beam being fixedly connected to the first supporting crossbeam and the other end being fixedly connected to the second supporting crossbeam.

[0014] Preferably, the first end of the movable tube beam is fixedly connected to the first supporting crossbeam via a plurality of tuned viscous dampers, one end of the tuned viscous damper being fixedly connected to the first end of the movable tube beam and the other end being fixedly connected to the first supporting crossbeam; a first receiving cavity is provided inside the first supporting crossbeam, and the first end of the movable tube beam and all the tuned viscous dampers are located in the first receiving cavity.

[0015] Preferably, the first fixing sleeve, the second fixing sleeve, the fixed tube beam, the movable tube beam, and the safety ring are coaxial.

[0016] Preferably, the fixed tube beam is provided with two limiting rings, one of which abuts against one end of the second fixed sleeve, and the other of which abuts against the other end of the second fixed sleeve.

[0017] Preferably, there are at least two seismic-resistant units, and all of the seismic-resistant units are distributed at intervals along the lateral direction of the rigid frame bridge.

[0018] Preferably, a cavity is formed between the first supporting crossbeam and the second supporting crossbeam, and the safety ring, the second end of the movable tube beam, and the second end of the fixed tube beam are all located in the cavity.

[0019] Preferably, the first and / or the second support crossbeams are further provided with a manhole communicating with the cavity, the manhole serving as a passage for operators to access the cavity.

[0020] The present invention achieves the following technical effects compared to the prior art:

[0021] The rigid frame bridge anti-fault displacement mid-span rigid hinge of the present invention can effectively release the forced displacement caused by fault displacement, reduce the cross-fault seismic force on the main beam and pier, and realize the anti-fault displacement of rigid frame bridge. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 is a structural schematic diagram of a rigid frame bridge equipped with the mid-span rigid hinge for resisting fault displacement of the present invention.

[0024] Figure 2 is a longitudinal cross-sectional view of the mid-span rigid hinge for resisting fault displacement in the rigid frame bridge of the present invention.

[0025] Figure 3 is a cross-sectional view of AA in Figure 2;

[0026] Figure 4 is a cross-sectional view of BB in Figure 2;

[0027] Among them, 100, rigid hinge at mid-span for rigid frame bridge to resist fault displacement; 1, first receiving cavity; 2, first supporting transverse beam; 3, movable tube beam; 4, first fixed sleeve; 5, second receiving cavity; 6, second supporting transverse beam; 7, second fixed sleeve; 8, fixed tube beam; 9, safety ring; 10, telescopic connecting beam; 11, tuned viscous damper; 12, cavity; 13, manhole; 14, limiting ring. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] The purpose of this invention is to provide a mid-span rigid hinge 100 for rigid frame bridges to resist fault displacement, so as to solve the problems existing in the prior art and realize the resistance of rigid frame bridges to fault displacement.

[0030] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] As shown in Figures 1-4, this embodiment provides a mid-span rigid hinge 100 for rigid frame bridges to resist fault displacement, including a first supporting transverse beam 2, a second supporting transverse beam 6, and a seismic unit.

[0032] The main girder of the rigid frame bridge located on one side of the mid-span is called the first main girder, and the main girder of the rigid frame bridge located on the other side of the mid-span is called the second main girder. One end of the first supporting transverse beam 2 is fixedly connected to the end of the first main girder near the mid-span, and one end of the second supporting transverse beam 6 is fixedly connected to the end of the second main girder near the mid-span.

[0033] In this embodiment, there are two seismic resistance units, and the two seismic resistance units are distributed at intervals along the lateral side of the rigid frame bridge.

[0034] Each seismic unit includes a first fixed sleeve 4, a second fixed sleeve 7, a fixed tube beam 8, a movable tube beam 3, and a safety ring 9; the axial directions of the first fixed sleeve 4, the second fixed sleeve 7, the fixed tube beam 8, the movable tube beam 3, and the safety ring 9 are all the same as the longitudinal direction of the rigid frame bridge; the first fixed sleeve 4, the second fixed sleeve 7, the fixed tube beam 8, the movable tube beam 3, and the safety ring 9 in the same seismic unit are coaxial.

[0035] The first fixed sleeve 4 is disposed inside the first supporting transverse beam 2, the movable tube beam 3 passes through the first fixed sleeve 4 and is slidably engaged with the first fixed sleeve 4, and the first end of the movable tube beam 3 is fixedly connected to the first supporting transverse beam 2; the second fixed sleeve 7 is disposed inside the second supporting transverse beam 6, the fixed tube beam 8 passes through the second fixed sleeve 7, and the fixed tube beam 8 is fixedly connected to the second supporting transverse beam 6; the safety ring 9 is located between the fixed tube beam 8 and the movable tube beam 3, and the second end of the fixed tube beam 8 and the second end of the movable tube beam 3 are respectively fixedly connected to the safety ring 9.

[0036] It should be noted that the yield points of both the fixed pipe beam 8 and the movable pipe beam 3 are higher than the yield point of the safety ring 9, and the ring width of the safety ring 9 is 0.5m-1m, which facilitates installation and subsequent maintenance and replacement.

[0037] The rigid frame bridge anti-fault displacement mid-span rigid hinge 100 of this embodiment also includes a telescopic connecting beam 10 located between the first supporting transverse beam 2 and the second supporting transverse beam 6. One end of the telescopic connecting beam 10 is fixedly connected to the first supporting transverse beam 2 and the other end is fixedly connected to the second supporting transverse beam 6.

[0038] In this embodiment, the first end of the movable tube beam 3 is fixedly connected to the first supporting transverse beam 2 via several tuned viscous dampers 11. One end of each tuned viscous damper 11 is fixedly connected to the first end of the movable tube beam 3, and the other end is fixedly connected to the first supporting transverse beam 2. A first receiving cavity 1 is provided inside the first supporting transverse beam 2, and the first end of the movable tube beam 3 and all the tuned viscous dampers 11 are located in the first receiving cavity 1. The function of the tuned viscous dampers 11 is to assist in controlling the movement of the movable tube beam along the longitudinal direction of the bridge 3, and to reduce the relative displacement of the first main beam and the second main beam during an earthquake. A second receiving cavity 5 is provided inside the second supporting transverse beam 6, and the end of the fixed tube beam 8 away from the safety ring 9 is located in the second receiving cavity 5.

[0039] Two limiting rings 14 are provided on the fixed pipe beam 8. One limiting ring 14 abuts against one end of the second fixed sleeve 7, and the other limiting ring 14 abuts against the other end of the second fixed sleeve 7. The two limiting rings 14 can fix the fixed pipe beam 8 and the second fixed sleeve 7 relative to each other, preventing the fixed pipe beam 8 from sliding relative to the second fixed sleeve 7.

[0040] A cavity 12 is formed between the first supporting crossbeam 2 and the second supporting crossbeam 6. The safety ring 9, the second end of the movable tube beam 3, and the second end of the fixed tube beam 8 are all located in the cavity 12. The first supporting crossbeam 2 and / or the second supporting crossbeam 6 are also provided with a manhole 13 communicating with the cavity 12. The manhole 13 serves as a passage for operators to access the cavity 12. After accessing the cavity 12 through the manhole 13, operators can perform welding of the safety ring 9 and other installation, maintenance, and other operations.

[0041] The working principle of the mid-span rigid hinge 100 for resisting fault displacement in the rigid frame bridge of this embodiment is as follows:

[0042] During an earthquake, due to the rigid frame bridge spanning a fault, the relative movement of different pier bases will cause the first and second main beams to tend to move relative to each other. Assuming that the first and second main beams move away from each other due to the earthquake, the first main beam will move the movable tube beam 3 away from the second main beam through the first supporting transverse beam 2 and the tuned viscous damper 11. The second main beam will move the fixed tube beam 8 away from the first main beam through the second supporting transverse beam 6. However, since the movable tube beam 3 and the fixed tube beam 8 are connected by the safety ring 9, the tuned viscous damper 11 will first play its role in dissipating energy for longitudinal relative movement, while the safety ring 9 will mainly dissipate energy for vertical relative movement. The safety ring 9 absorbs energy and yields through deformation, minimizing damage to the articulated tube beam and the rest of the main beam. It should be noted that the safety ring 9 can deform by using steel with a lower yield point than the movable tube beam 3 and the fixed tube beam 8. At the same time, the safety ring 9 has a smaller ring width.

[0043] After the safety ring 9 yields, the movable tube beam 3 can slide relative to the first fixed sleeve 4, preventing the main body of the rigid frame bridge from being damaged by the earthquake. After the earthquake, only repair measures need to be taken to allow the first main beam and the second main beam to move relative to each other, and the movable tube beam 3 can be reconnected to the fixed tube beam 8 through the new safety ring 9 to restore the rigid frame bridge to its reuse. However, it should be noted that the longitudinal displacement of the movable tube beam 3 during the earthquake must be less than the maximum allowable displacement value. The maximum displacement value is related to the length of the movable tube beam and the length of the telescopic connecting beam. It is necessary to ensure that the tube beam does not detach from the first fixed sleeve 4 under the maximum displacement condition and that the displacement is less than the maximum relative displacement of the telescopic connecting beam.

[0044] In the description of this invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A mid-span rigid hinge for resisting fault displacement in a rigid frame bridge, wherein the main girder of the rigid frame bridge located on one side of the mid-span is a first main girder, and the main girder of the rigid frame bridge located on the other side of the mid-span is a second main girder, characterized in that, include: A first supporting transverse beam, one end of which is fixedly connected to the end of the first main beam near the mid-span; a second supporting transverse beam, one end of which is fixedly connected to the end of the second main beam near the mid-span; a seismic unit, the seismic unit comprising a first fixed sleeve, a second fixed sleeve, a fixed tube beam, a movable tube beam, and a safety ring; the axial directions of the first fixed sleeve, the second fixed sleeve, the fixed tube beam, the movable tube beam, and the safety ring are all the same as the longitudinal direction of the rigid frame bridge; the first fixed sleeve is disposed within the first supporting transverse beam, the movable tube beam passes through the first fixed sleeve and is slidably fitted with the first fixed sleeve; the second fixed sleeve is disposed within the second supporting transverse beam, the fixed tube beam passes through the second fixed sleeve and is fixedly connected to the second supporting transverse beam; the safety ring is located between the fixed tube beam and the movable tube beam, and the second end of the fixed tube beam and the second end of the movable tube beam are respectively fixedly connected to the safety ring; the first... The first supporting crossbeam is fixed to the first supporting crossbeam by several tuned viscous dampers. One end of each tuned viscous damper is fixed to the first end of the movable tube beam, and the other end is fixed to the first supporting crossbeam. A first receiving cavity is provided inside the first supporting crossbeam, and the first end of the movable tube beam and all the tuned viscous dampers are located in the first receiving cavity. There are at least two seismic units, and all the seismic units are distributed at intervals along the transverse direction of the rigid frame bridge. A cavity is formed between the first supporting crossbeam and the second supporting crossbeam, and the safety ring, the second end of the movable tube beam, and the second end of the fixed tube beam are all located in the cavity. A manhole communicating with the cavity is also provided on the first supporting crossbeam and / or the second supporting crossbeam, and the manhole serves as a passage for operators to access the cavity. Two limiting rings are provided on the fixed tube beam, one of which abuts against one end of the second fixed sleeve, and the other of which abuts against the other end of the second fixed sleeve.

2. The mid-span rigid hinge for rigid frame bridges resisting fault slippage according to claim 1, characterized in that: The yield points of both the fixed tube beam and the movable tube beam are higher than the yield point of the safety ring, and the ring width of the safety ring is 0.5m-1m.

3. The mid-span rigid hinge for rigid frame bridges resisting fault slippage according to claim 1, characterized in that: It also includes a telescopic connecting beam located between the first supporting crossbeam and the second supporting crossbeam, with one end of the telescopic connecting beam fixedly connected to the first supporting crossbeam and the other end fixedly connected to the second supporting crossbeam.

4. The mid-span rigid hinge for rigid frame bridges resisting fault slippage according to claim 1, characterized in that: The first fixed sleeve, the second fixed sleeve, the fixed tube beam, the movable tube beam, and the safety ring are coaxial.

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