A bridge earthquake-time limited curved beam

Abstract

The present invention relates to a bridge earthquake-time limit curved beam, belonging to the field of bridge energy consumption technology. The bridge earthquake-time limit curved beam includes an operation and maintenance module and an earthquake-time limit module, the operation and maintenance module includes a suspension assembly, a booster pin, a follower core block and a guide slideway, the suspension assembly is used to connect the main beam, the suspension assembly is contacted and connected with the follower core block through the booster pin, the follower core block is slidably connected with the guide slideway, the earthquake-time limit module includes a variable cross-section curved beam arranged along the transverse direction of the bridge, one end of the variable cross-section curved beam is connected to the follower core block, and the other end is connected to the connecting beam bracket, and the connecting beam bracket is used to connect with the main beam. Compared with the prior art, the present invention double guarantees the stability of the sliding behavior of the device under the normal use state of the bridge structure through two force transmission paths, and the controllability during the operation period is stronger; the symmetrically cross-arranged curved beams can be deformed to the maximum extent along the transverse direction of the bridge, and play the role of energy consumption and limit during earthquake.

Description

Technical Field

[0001] The invention relates to the technical field of bridge energy dissipation, in particular to a bridge earthquake-limited curved beam. Background Art

[0002] In the seismic isolation design of bridges, the shearing of fixed bearings or the seismic movable bearings at the movable piers are generally used to isolate the main beam from transmitting inertial force to the piers, thereby protecting the lower structure from serious damage. However, this will be accompanied by a large relative displacement between the pier and the beam. Generally, a series of energy-absorbing limit devices are used to control the relative displacement within an acceptable range without significantly increasing the seismic force of the lower structure. Among them, the energy-absorbing limit devices at the movable piers are not only required to provide a limiting function during an earthquake, but also to be able to adapt to various effects that may occur to the bridge structure under normal use, such as the expansion and contraction displacement of the main beam in the longitudinal direction of the bridge due to temperature during operation, the settlement of the piers, and the rotation and tilt of the beam ends caused by braking of heavy-loaded vehicles and strong winds.

[0003] The recurrence period of earthquake loads ranges from decades to thousands of years. It is an accidental effect in bridge design. The energy-dissipating limiter designed for this purpose only provides a limit effect during an earthquake. However, once installed in a bridge project, it must be able to adapt to various effects of the bridge structure during operation. These effects must exist and exist for a long time. More importantly, they may affect the performance of their limit function during earthquakes.

[0004] Chinese patent CN 106192738 A discloses a new C-shaped steel damping bearing for bridges, including a sliding plate assembly connected to the bridge beam and an anchor plate assembly connected to the bridge pier, and the C-shaped steel is connected to both ends thereof. In the patent, the sliding mechanism during the operation period is sensitive to elevation changes. Once the pier has a slight settlement, the length (arm) of the C-shaped steel along the transverse direction of the bridge will produce a large angle in the sliding plate assembly, which seriously affects its sliding mechanism. At the same time, heavy-load vehicle braking and strong winds during the operation period will pose "short-term" challenges to the sliding mechanism. However, during the service life of the limit device (generally 20 to 50 years), these frequently encountered "short-term" challenges become important. Once a problem occurs in the sliding mechanism, it will not only produce redundant constraints on the main beam, but also affect its energy-consuming limit function during earthquakes. In addition, the device occupies a large space along the bridge direction, has a high demand for horizontal space, and has limited installation universality. Summary of the invention

[0005] The purpose of the present invention is to provide a bridge earthquake-limited curved beam to make the bridge more controllable during operation.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] The present invention provides a bridge earthquake-time limiting curved beam, comprising an operation and maintenance module and a earthquake-time limiting module, the operation and maintenance module comprising a suspension assembly, a booster pin, a follower core block and a guide slide, the suspension assembly is used to connect the main beam, the suspension assembly is contacted and connected with the follower core block through the booster pin, the follower core block is slidably connected with the guide slide, the earthquake-time limiting module comprises a variable-section curved beam arranged along the transverse direction of the bridge, one end of the variable-section curved beam is connected to the follower core block, and the other end is connected to a connecting beam bracket, and the connecting beam bracket is used to connect with the main beam.

[0008] In the present invention, the follower core block can slide freely along the longitudinal direction of the bridge through the guide slideway. There are two force transmission paths. The first one is realized by the booster pin embedded in the suspension assembly in the operation and maintenance module, and the second one is realized by the variable-section curved beam in the earthquake limit module.

[0009] In one embodiment of the present invention, two ends of the variable-section curved beam are respectively connected to a left ear plate and a right ear plate, the left ear plate is connected to a follower core block, and the right ear plate is connected to a connecting beam bracket.

[0010] The two ends of the variable-section curved beam are respectively connected to the left ear plate and the right ear plate, the left ear plate is connected to the follower core block, and the right ear plate is connected to the connecting beam bracket, forming a second force transmission path.

[0011] In one embodiment of the present invention, a plurality of the variable-section curved beams are provided, and the plurality of variable-section curved beams are symmetrically cross-arranged.

[0012] Furthermore, the two ends of the variable-section curved beam are connected to the left ear plate or the right ear plate through a pin and a nut, and the screw tail end of the pin is tightened by the nut to ensure that the variable-section curved beam only produces good hysteresis energy dissipation behavior within the plane during vibration.

[0013] In one embodiment of the present invention, a step cover plate is provided on the top of the booster pin, and a V-shaped incision is provided in the middle portion. The booster pin is suspended in the suspension assembly through the step cover plate, and the bottom of the booster pin extends into the follower core block, and the V-shaped incision exists between the suspension assembly and the follower core block.

[0014] In one embodiment of the present invention, a replacement bin is provided in the suspension assembly, a first hole is opened at the bottom of the replacement bin, and the booster pin is suspended in the first hole at the bottom of the replacement bin through a step cover plate.

[0015] In one embodiment of the present invention, the first hole is a circular hole.

[0016] In one embodiment of the present invention, a second hole is provided on the upper portion of the follower core block along the transverse bridge direction, and the bottom of the boosting pin extends into the second hole in the follower core block.

[0017] The boosting pin is inserted into the first hole at the lower part of the replacement bin and the second hole of the follower core block which are docked to form a first force transmission path.

[0018] In one embodiment of the present invention, the second hole is an elliptical hole, the length of the minor axis of the second hole is the same as the diameter of the boost pin, and the interval between the major axis and the boost pin is not greater than the yield displacement of the variable-section curved beam.

[0019] In one embodiment of the present invention, the guide slideway is connected to the pier top embedded plate; the pier top embedded plate is connected to the bridge pier via a ground anchor screw.

[0020] In one embodiment of the present invention, the suspension assembly is connected to the main beam via suspension assembly connecting bolts.

[0021] In one embodiment of the present invention, the connecting beam bracket is connected to the main beam via connecting beam bracket connecting bolts.

[0022] In one embodiment of the present invention, a sliding contact surface is formed between the follower core block and the guide slideway for relative movement along the longitudinal direction of the bridge, and the sliding contact surface is composed of an ultra-high molecular plate and a mirror stainless steel plate to reduce friction.

[0023] When the bridge structure is in normal use, the operation and maintenance module is the main component of the device. The main beam and suspension assembly drive the follower core block to slide freely through the boost pin shaft with set capacity. This is the first force transmission path. Considering the challenges to the sliding mechanism caused by pier settlement, heavy-load vehicle braking, strong winds, etc. that may occur during the operation period, the connecting beam bracket and the variable-section curved beam in the earthquake limit module slide in coordination with the follower core block. This is the second force transmission path. During the earthquake, the boost pin with set capacity undergoes shear failure in a specified mode, and then the variable-section curved beam begins to deform along the transverse direction of the bridge, playing the role of energy dissipation and limit.

[0024] In addition to assisting the sliding of the follower core block during operation and providing energy dissipation and limiting functions during earthquakes, the variable-section curved beam also has the following functions: in normal use, the elliptical hole set on the top of the follower core block allows the curved beam to operate within the range of elastic deformation, providing a certain transverse strength and stiffness for the bridge structure support system.

[0025] The present invention dually ensures the stability of the sliding behavior of the device under normal use of the bridge structure through two force transmission paths, and has stronger controllability during operation; the symmetrically cross-arranged curved beams can deform to the maximum extent along the transverse direction of the bridge, and also play a role in energy consumption and limiting during earthquakes; the space requirements in both the longitudinal and transverse directions of the bridge are relatively small, and the installation is universal; the booster pins can be adjusted and replaced according to the actual operation conditions of the bridge structure to monitor and improve the sliding performance of the operation and maintenance module; at the same time, the operation and maintenance module is highly detachable, the earthquake limit module is highly modularized, and daily and post-earthquake maintenance and replacement are relatively low.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] 1. When the bridge structure is in normal use, the follower core block, as the main working component of the device, has two force transmission paths as a guarantee of the sliding mechanism, making the device more controllable during the operation period.

[0028] 2. The flexible docking design of the replacement bin and the booster pin with setting capacity in the suspension assembly in the operation and maintenance module allows engineers to monitor and improve the sliding performance of the follower core block in real time, which is convenient for inspection, adjustment and replacement.

[0029] 3. The variable-section curved beams in the earthquake limit module are symmetrically cross-arranged, which greatly saves the horizontal space requirements of the device in the longitudinal and transverse directions of the bridge, making its spatial installation more universal.

[0030] 4. When the bridge structure is in normal use, the device can provide a certain stiffness and strength in the transverse direction of the bridge for the supporting connection system, and can replace the restraint behavior of certain one-way bearings in the transverse direction of the bridge depending on the situation.

[0031] 5. The device operation and maintenance module is highly detachable, the earthquake limit module is highly modular, and the daily and post-earthquake maintenance and replacement costs are relatively low. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 Schematic diagram of the top view of the structure of the bridge earthquake limit curved beam in Example 1;

[0033] Figure 2 This is a schematic diagram of the main structure of the bridge earthquake-limited curved beam in Example 1;

[0034] Figure 3 It is a schematic diagram of the three-dimensional structure of the bridge earthquake-limited curved beam in Example 1;

[0035] Figure 4 This is a schematic diagram of the main structure of the operation and maintenance module of the bridge earthquake-limited curved beam in Example 1;

[0036] Figure 5 Schematic diagram of the top view of the structure of the earthquake time limiting module of the bridge earthquake time limiting curved beam in Example 1;

[0037] Figure 6 It is a schematic diagram of the three-dimensional structure of the seismic time limiting module of the bridge seismic time limiting curved beam in the first embodiment;

[0038] Figure 7 It is a schematic diagram of the three-dimensional structure of the suspension assembly of the bridge earthquake-limited curved beam in Example 1;

[0039] Figure 8It is a schematic diagram of the boosting pin structure of the bridge earthquake limiting curved beam in the first embodiment;

[0040] Fig. 9 It is a schematic diagram of the three-dimensional structure of the follower core block of the bridge earthquake-limited curved beam in the first embodiment;

[0041] Fig.10 It is a schematic diagram of the three-dimensional structure of the guide slideway of the bridge earthquake limiting curved beam in Example 1;

[0042] Fig.11 It is a schematic diagram of the three-dimensional structure of the left ear plate or the right ear plate of the bridge earthquake limiting curved beam in Example 1;

[0043] Fig.12 It is a schematic diagram of the three-dimensional structure of the connection assembly for connecting the variable-section curved beam and the ear plate of the bridge earthquake limiting curved beam in the first embodiment;

[0044] Fig.13 This is a schematic diagram of the first force transmission path of the bridge's earthquake-limited curved beam in Example 1;

[0045] Fig.14 This is a schematic diagram of the second force transmission path of the bridge earthquake-limited curved beam in Example 1.

[0046] The numbers in the figure show:

[0047] 1-suspension assembly, 2-boost pin, 3-follow-up core block, 4-guide slide, 5-pier top embedded plate, 6-left ear plate, 7-variable cross-section curved beam, 8-right ear plate, 9-connecting beam bracket, 10-connecting beam bracket connecting bolt, 11-replacement bin, 12-suspension assembly connecting bolt, 13-nut, 14-ground anchor screw, 15-first hole, 16-pin shaft, 21-step cover plate, 22-V-shaped incision, 31-ultra-high molecular weight plate, 32-second hole, 41-mirror stainless steel plate. DETAILED DESCRIPTION

[0048] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0049] Embodiment 1

[0050] refer to Figure 1-Figure 6 The present embodiment provides a bridge seismic time-limited curved beam with stronger controllability during operation, including an operation and maintenance module and a seismic time-limited module. The operation and maintenance module includes a suspension assembly 1, a booster pin 2, a follower core block 3 and a guide slide 4. The suspension assembly 1 is used to connect the main beam. The suspension assembly 1 is contacted and connected with the follower core block 3 through the booster pin 2. The follower core block 3 is slidably connected with the guide slide 4. The seismic time-limited module includes a variable-section curved beam 7 arranged along the transverse direction of the bridge. One end of the variable-section curved beam 7 is connected to the follower core block 3, and the other end is connected to a connecting beam bracket 9. The connecting beam bracket 9 is used to connect to the main beam.

[0051] In this embodiment, the follower core block 3 can slide freely along the longitudinal direction of the bridge through the guide slide 4. There are two force transmission paths. The first one is realized by the booster pin 2 inserted in the suspension assembly 1 in the operation and maintenance module, and the second one is realized by the variable-section curved beam 7 in the earthquake limit module.

[0052] In this embodiment, reference Figure 1 , Figure 5 , Figure 6 , Fig.11 The two ends of the variable cross-section curved beam 7 are respectively connected to the left ear plate 6 and the right ear plate 8, the left ear plate 6 is connected to the follower core block 3, and the right ear plate 8 is connected to the connecting beam bracket 9. The two ends of the variable cross-section curved beam are respectively connected to the left ear plate and the right ear plate, the left ear plate is connected to the follower core block, and the right ear plate is connected to the connecting beam bracket, forming a second force transmission path.

[0053] Further references Fig.11 , Fig.12 The two ends of the variable-section curved beam 7 are connected to the left ear plate 6 or the right ear plate 8 through a pin 16 and a nut. The screw tail end of the pin 16 is tightened by a nut 13 to ensure that the variable-section curved beam 7 only produces good hysteresis energy dissipation behavior within the plane when it vibrates.

[0054] refer to Figure 1 , Figure 2 , Figure 3 , Figure 6 The variable-section curved beam 7 is provided with a plurality of variable-section curved beams 7 which are symmetrically cross-arranged.

[0055] refer to Figure 4 , Figure 8 In this embodiment, a step cover plate 21 is provided on the top of the booster latch 2, and a V-shaped cutout 22 is provided in the middle portion. The booster latch 2 is suspended in the suspension assembly 1 through the step cover plate 21, and the bottom of the booster latch 2 extends into the follower core block 3. The V-shaped cutout 22 exists between the suspension assembly 1 and the follower core block 3.

[0056] refer to Figure 7 In this embodiment, a replacement bin 11 is provided in the suspension assembly 1 , a first hole 15 is opened at the bottom of the replacement bin 11 , and the booster pin 2 is suspended in the first hole 15 at the bottom of the replacement bin 11 through a step cover plate 21 .

[0057] refer to Figure 7 In this embodiment, the first hole 15 is a circular hole.

[0058] refer to Fig. 9 In this embodiment, a second hole 32 is provided on the upper portion of the follower core block 3 along the transverse bridge direction, and the bottom of the booster pin 2 extends into the second hole 32 in the follower core block 3 .

[0059] refer to Fig. 9 In this embodiment, the second hole 32 is an elliptical hole, the length of the minor axis of the second hole 32 is the same as the diameter of the booster pin 2, and the interval between the major axis and the booster pin 2 is not greater than the yield displacement of the variable-section curved beam 7.

[0060] The boosting pin is inserted into the first hole at the lower part of the replacement bin and the second hole of the follower core block which are docked to form a first force transmission path.

[0061] refer to Figure 2 , Figure 3 , Fig.13 In this embodiment, the guide slideway 4 is connected to the pier top embedded plate 5; the pier top embedded plate 5 is connected to the bridge pier through the ground anchor screw 14.

[0062] refer to Figure 3 , Figure 4 The suspension assembly 1 is connected to the main beam via the suspension assembly connecting bolts 12.

[0063] refer to Figure 2 , Figure 3 The connecting beam bracket 9 is connected to the main beam through the connecting beam bracket connecting bolts 10.

[0064] refer to Fig. 9 , Fig.10 In this embodiment, the follower core block 3 and the guide slideway 4 form a sliding contact surface that moves relatively along the longitudinal direction of the bridge. The sliding contact surface is composed of an ultra-high molecular plate 31 and a mirror stainless steel plate 41 to reduce friction.

[0065] See also Fig.13 In the operation and maintenance module, the main beam is connected to the suspension assembly 1 through the suspension assembly connecting bolts 12, the suspension assembly 1 is connected to the follower core block 3 through the booster pin 2, the follower core block 3 is connected to the guide slide 4 through the inserted sliding surface, and the guide slide 4 is connected to the pier top embedded plate 5; the pier top embedded plate 5 is connected to the bridge pier through the anchor screw 14, forming the first force transmission path.

[0066] See also Fig.14 The core block 3 is connected to the left ear plate 6 in the earthquake limiting module, the left ear plate 6 is connected to the variable-section curved beam 7, the other side of the variable-section curved beam 7 is connected to the right ear plate 8, the right ear plate 8 is connected to the connecting beam bracket 9, and the connecting beam bracket 9 is connected to the main beam through the connecting beam bracket connecting bolts 10, forming a second force transmission path.

[0067] When the bridge structure is in normal use, the operation and maintenance module is the main component of the device. The main beam and suspension assembly drive the follower core block to slide freely through the boost pin shaft with set capacity. This is the first force transmission path. Considering the challenges to the sliding mechanism caused by pier settlement, heavy-load vehicle braking, strong winds, etc. that may occur during the operation period, the connecting beam bracket and the variable-section curved beam in the earthquake limit module slide in coordination with the follower core block. This is the second force transmission path. During the earthquake, the boost pin with set capacity undergoes shear failure in a specified mode, and then the variable-section curved beam begins to deform along the transverse direction of the bridge, playing the role of energy dissipation and limit.

[0068] In addition to assisting the sliding of the follower core block during operation and providing energy dissipation and limiting functions during earthquakes, the variable-section curved beam also has the following functions: in normal use, the elliptical hole set on the top of the follower core block allows the curved beam to operate within the range of elastic deformation, providing a certain transverse strength and stiffness for the bridge structure support system.

[0069] The above description of the embodiments is to facilitate the understanding and use of the invention by those skilled in the art. It is obvious that those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative work. Therefore, the present invention is not limited to the above embodiments, and improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. A bridge earthquake limited curved beam, characterized in that: The invention comprises an operation and maintenance module and a seismic time limit module, wherein the operation and maintenance module comprises a suspension assembly (1), a boosting pin (2), a follower core block (3) and a guide slideway (4), wherein the suspension assembly (1) is used to connect the main beam, wherein the suspension assembly (1) is contact-connected with the follower core block (3) via the boosting pin (2), wherein the follower core block (3) is slidably connected with the guide slideway (4), and wherein the seismic time limit module comprises a variable cross-section curved beam (7) arranged along the transverse direction of the bridge, wherein one end of the variable cross-section curved beam (7) is connected to the follower core block (3), and the other end is connected to a connecting beam bracket (9), wherein the connecting beam bracket (9) is used to connect to the main beam; The follower core block (3) slides freely along the longitudinal direction of the bridge through the guide slideway (4), and there are two force transmission paths, the first of which is realized by the boosting pin (2) in the operation and maintenance module, and the second is realized by the variable-section curved beam (7) in the earthquake time limit module; The variable cross-section curved beam (7) is provided in plurality, and the plurality of variable cross-section curved beams (7) are symmetrically cross-arranged; When the bridge structure is in normal use, the operation and maintenance module is the main working component of the device. The main beam and the suspension assembly drive the follower core block to slide freely through the booster pin shaft with set capacity. This is the first force transmission path. The connecting beam bracket and the variable-section curved beam in the earthquake limit module slide in coordination with the follower core block. This is the second force transmission path. During an earthquake, the booster pin with set capacity undergoes shear failure in a specified mode, and then the variable-section curved beam begins to deform along the transverse direction of the bridge, playing the role of energy dissipation and limiting.

2. The bridge earthquake limited curved beam according to claim 1, characterized in that: The two ends of the variable cross-section curved beam (7) are respectively connected to a left ear plate (6) and a right ear plate (8); the left ear plate (6) is connected to a follower core block (3); and the right ear plate (8) is connected to a connecting beam bracket (9).

3. The bridge earthquake limited curved beam according to claim 1, characterized in that: The boosting pin (2) is provided with a step cover plate (21) at the top and a V-shaped cutout (22) at the middle. The boosting pin (2) is suspended in the suspension assembly (1) through the step cover plate (21). The bottom of the boosting pin (2) extends into the follower core block (3). The V-shaped cutout (22) exists between the suspension assembly (1) and the follower core block (3).

4. The bridge earthquake limited curved beam according to claim 3 is characterized in that: A replacement bin (11) is provided in the suspension assembly (1), a first hole (15) is provided at the bottom of the replacement bin (11), and the booster latch (2) is suspended in the first hole (15) at the bottom of the replacement bin (11) through a step cover plate (21).

5. The bridge earthquake limited curved beam according to claim 3, characterized in that: A second hole (32) is arranged on the upper part of the follower core block (3) along the transverse bridge direction, and the bottom of the boosting pin (2) extends into the second hole (32) in the follower core block (3).

6. The bridge earthquake limited curved beam according to claim 5, characterized in that: The second hole (32) is an elliptical hole, the length of the minor axis of the second hole (32) is the same as the diameter of the boosting pin (2), and the interval between the major axis and the boosting pin (2) is not greater than the yield displacement of the variable-section curved beam (7).

7. The bridge earthquake limited curved beam according to claim 1, characterized in that: The guide slideway (4) is connected to the pier top embedded plate (5); the pier top embedded plate (5) is connected to the bridge pier via a ground anchor screw (14).

8. The bridge earthquake limited curved beam according to claim 1, characterized in that: A sliding contact surface that moves relatively along the longitudinal direction of the bridge is provided between the follower core block (3) and the guide slideway (4), and the sliding contact surface is composed of an ultra-high molecular plate (31) and a mirror stainless steel plate (41).

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