Bridge transverse overturning early warning device and method under heavy traffic flow

Abstract

The invention discloses an early warning device and method for transverse overturning of a bridge under heavy traffic flow. The device comprises a control terminal, detection mechanisms symmetrically installed on the two sides of a pier, flow guide mechanisms installed on guardrails on the two sides of a bridge, blocking rods installed on the two sides of an approach bridge, and an automatic protection mechanism installed in a bridge expansion joint between the approach bridge and a main bridge. The method comprises the following steps: 1, acquiring heavy-load traffic flow on a bridge in real time; 2, obtaining a dynamic response result of the bridge in a heavy-load traffic flow state, and determining a bridge displacement time travel curve under the heavy-load traffic flow effect; 3, monitoring the bridge in real time by using the bridge transverse overturning early warning device under the heavy traffic flow, and collecting the actual measurement dynamic response amplitude of the bridge in real time; 4, calculating a transverse early warning safety coefficient of the bridge; and 5, obtaining the early warning level of the transverse overturning of the bridge under the heavy-load traffic flow, and carrying out corresponding early warning protection. According to the invention, the transverse overturning condition of the bridge can be monitored in real time, and vehicles getting on the bridge can be managed and controlled in real time.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge overturning warning, and in particular relates to a device and method for warning the lateral overturning of a bridge under heavy-load traffic. Background Art

[0002] Single pier is a single-column pier. Since the pier in a single-column pier bridge is mainly supported by a single hinge, and the diameter of the single-column pier is limited, the spacing between the lateral supports is small, the deadweight of the beam is not large, and the anti-overturning moment is small, the lateral anti-overturning stability of the bridge is poor. Therefore, under the eccentric driving of overweight vehicles and multiple heavy vehicles in succession, the bridge will cause the problem of lateral overturning. Once an accident occurs, it will cause serious casualties, economic losses and social impacts. Therefore, a lateral overturning warning device and method for bridges under heavy-load traffic is urgently needed. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a lateral overturning warning device for bridges under heavy-load traffic in response to the deficiencies in the above-mentioned prior art. The device has a novel and reasonable design, can monitor the lateral overturning of the bridge in real time, and perform real-time control of vehicles on the bridge. The automatic vehicle guardrail mechanism is installed at the expansion joint, which neither affects traffic nor takes up space, is easy to operate, and is convenient for promotion and use.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a bridge lateral overturning warning device under heavy-load traffic, characterized in that it includes a control terminal, a detection mechanism symmetrically installed on both sides of the bridge pier, a diversion mechanism installed on the guardrails on both sides of the bridge, a stopper rod installed on both sides of the approach bridge, and an automatic guard mechanism installed in the expansion joint of the bridge between the approach bridge and the main bridge;

[0005] The detection mechanism includes a displacement meter, a strain meter and a pressure meter arranged from the inside to the outside between the pier and the bridge;

[0006] The diversion mechanism includes a diversion indicator and a first telescopic rod used to drive the diversion indicator to extend to limit the traffic flow of the corresponding side lane;

[0007] The automatic guardrail mechanism includes a plurality of automatic guardrail units installed in the expansion joint of the bridge and used to block the passage of vehicles on the corresponding lanes. The automatic guardrail units include a steel base plate and a steel baffle hinged to the steel base plate. A second telescopic rod for lifting or retracting the steel baffle is provided on the steel base plate.

[0008] The above-mentioned device for warning the lateral overturning of a bridge under heavy-load traffic is characterized in that a plurality of wide-angle cameras are arranged along the length direction of the guardrail.

[0009] The above-mentioned device for early warning of lateral overturning of a bridge under heavy traffic is characterized in that a display screen for information reminders and displaying early warning information is provided on the approach bridge.

[0010] At the same time, the present invention also discloses a method for early warning of lateral overturning of a bridge under heavy-load traffic, which is characterized in that the method comprises the following steps:

[0011] Step 1: Real-time collection of heavy-load traffic on the bridge;

[0012] Step 2: Obtain the dynamic response result of the bridge under the heavy traffic flow state, and determine the displacement time history curve of the bridge under the heavy traffic flow;

[0013] Step 3: Use the bridge lateral overturning warning device under heavy traffic to monitor the bridge in real time, and collect the actual dynamic response amplitude of the bridge in real time;

[0014] Step 4: According to the formula Calculate the bridge lateral warning safety factor a, where A b is the measured dynamic response amplitude of the bridge, A t The dynamic response amplitude of the bridge theoretically calculated given by the time history curve of bridge displacement under heavy traffic flow;

[0015] Step 5: Obtain the warning level of lateral overturning of the bridge under heavy traffic flow and perform corresponding warning protection. The process is as follows:

[0016] When the bridge's lateral warning safety factor a≥1.5, the bridge's lateral overturning warning level under heavy traffic reaches level one, and bridge warning control protection is carried out. The lateral overturning direction of the bridge is obtained through a wide-angle camera, displacement meter, strain gauge and pressure gauge. The lateral overturning direction of the bridge is the side where the data collected by the displacement meter, strain gauge and pressure gauge on the corresponding side increases. At this time, the gear lever corresponding to the side of the bridge where the data collected by the displacement meter, strain gauge and pressure gauge increases is activated to reduce the traffic volume in the lane on the corresponding side; at the same time, the first telescopic rod corresponding to the side of the bridge where the data collected by the displacement meter, strain gauge and pressure gauge increases is extended, and the diversion indicator guides the vehicle to change lanes to reduce the traffic volume in the lane on the corresponding side; the automatic guard unit installed at the expansion joint on the corresponding lane is activated in real time to prevent vehicles from passing through the lane on the corresponding side;

[0017] When the bridge lateral warning safety factor is 1.2<a<1.5, the bridge lateral overturning warning level under heavy traffic reaches Level 2, and the monitoring frequency is increased. The lateral overturning trend of the bridge is obtained through wide-angle cameras, displacement meters, strain gauges and pressure gauges, and lane suggestions are given through the display screen set on the approach bridge for information reminders and display of warning information;

[0018] When the lateral warning safety factor of the bridge a≤1.2, the lateral overturning warning level of the bridge under heavy traffic is level three, and normal warning monitoring of the bridge is carried out.

[0019] The above-mentioned method for warning of lateral overturning of bridges under heavy traffic is characterized in that: in step five, when the lateral warning safety factor a of the bridge is ≥1.5, the lateral overturning warning level of the bridge under heavy traffic reaches level one, and bridge warning control protection is performed; when the lateral warning safety factor a of the bridge is reduced to 1.2, the guide mechanism, the gear lever and the automatic guard mechanism return to the initial state, and the display screen displays the return to normal instruction.

[0020] The above-mentioned method for early warning of lateral overturning of a bridge under heavy traffic is characterized in that: in step one, the heavy traffic on the bridge includes the number of vehicles on each lane of the bridge, the distance between vehicles, the type of vehicles and the driving speed.

[0021] The above-mentioned method for early warning of lateral overturning of a bridge under heavy traffic flow is characterized in that: in step 2, the dynamic response result of the bridge under the heavy traffic flow state is obtained, and the displacement time history curve of the bridge under the heavy traffic flow is determined, including the following steps:

[0022] Step 201: Construct the vehicle-bridge coupling matrix under the current heavy-load vehicle flow state and solve the corresponding bridge dynamic response increment in, is the vehicle mass matrix under the current heavy-load traffic state, M B is the bridge mass matrix, is the vehicle damping matrix under the current heavy traffic state, C B is the bridge damping matrix, is the bridge damping coupling matrix under the current heavy traffic state; is the bridge-vehicle damping coupling matrix under the current heavy traffic state, is the vehicle stiffness matrix under the current heavy-load traffic state, K B is the bridge stiffness matrix, is the bridge stiffness coupling matrix under the current heavy traffic state, is the bridge-vehicle stiffness coupling matrix under the current heavy-load traffic state, is the external force matrix of the vehicle under the current heavy-load traffic state, is the external force matrix of the bridge under the current heavy traffic state;

[0023] Y i is the vehicle displacement increment matrix under the current heavy traffic state, is the vehicle speed increment matrix under the current heavy traffic state, is the vehicle acceleration increment matrix under the current heavy traffic state;

[0024] Q i is the incremental matrix of bridge displacement under the current heavy traffic state, is the bridge speed increment matrix under the current heavy traffic state, is the incremental matrix of bridge acceleration under the current heavy traffic state;

[0025] The bridge displacement increment matrix, bridge velocity increment matrix and bridge acceleration increment matrix constitute the bridge dynamic response increment;

[0026] Step 202, obtaining the dynamic response result of the bridge under the current heavy-load traffic state: the initial state of the heavy-load traffic on the bridge is a 0 vector, and the dynamic response increment of the bridge under the current heavy-load traffic state is accumulated to obtain the dynamic response result of the bridge under the current heavy-load traffic state;

[0027] Step 203: Collect the heavy-loaded traffic on the bridge at the next moment, construct the vehicle-bridge coupling matrix under the heavy-loaded traffic state at the next moment, and solve the corresponding bridge dynamic response increment in, is the vehicle mass matrix under the heavy-load traffic state at the next moment, is the vehicle damping matrix under the heavy traffic state at the next moment, is the bridge damping coupling matrix under the heavy traffic state at the next moment; is the bridge-vehicle damping coupling matrix under the heavy traffic state at the next moment, is the vehicle stiffness matrix under the heavy-load traffic state at the next moment, is the bridge stiffness coupling matrix under the heavy traffic state at the next moment, is the bridge-vehicle stiffness coupling matrix under the heavy traffic state at the next moment, is the external force matrix of the vehicle under the heavy traffic state at the next moment, is the external force matrix of the bridge under the heavy traffic state at the next moment;

[0028] Y i+1 is the vehicle displacement increment matrix under the heavy traffic state at the next moment, is the vehicle speed increment matrix under the heavy traffic state at the next moment, The vehicle acceleration increment matrix under the heavy traffic state at the next moment;

[0029] Q i+1 is the incremental matrix of bridge displacement under heavy traffic conditions at the next moment, is the bridge speed increment matrix under the heavy traffic state at the next moment, The incremental matrix of bridge acceleration under heavy traffic condition at the next moment;

[0030] Step 204: Obtain the dynamic response result of the bridge under the heavy traffic state at the next moment:

[0031] At the next moment, the incremental displacement matrix Q of the bridge under the heavy traffic state i+1 and the bridge displacement increment matrix Q under the current heavy traffic state iWhen the dimensions are consistent, the dynamic response increment of the bridge under the heavy traffic state at the next moment is accumulated to obtain the dynamic response result of the bridge under the heavy traffic state at the next moment;

[0032] At the next moment, the incremental displacement matrix Q of the bridge under the heavy traffic state i+1 and the bridge displacement increment matrix Q under the current heavy traffic state i When the dimensions are inconsistent and there are new vehicles on the bridge, the last bit of the matrix corresponding to the dynamic response result of the bridge under the current heavy traffic state is filled with 0, and then it is accumulated with the dynamic response increment of the bridge under the heavy traffic state at the next moment to obtain the dynamic response result of the bridge under the heavy traffic state at the next moment;

[0033] At the next moment, the incremental displacement matrix Q of the bridge under the heavy traffic state i+1 and the bridge displacement increment matrix Q under the current heavy traffic state i When the dimensions are inconsistent and there are vehicles going down the bridge, the first digit of the matrix corresponding to the dynamic response result of the bridge under the current heavy traffic state is filled with 0, and then it is accumulated with the dynamic response increment of the bridge under the heavy traffic state at the next moment to obtain the dynamic response result of the bridge under the heavy traffic state at the next moment;

[0034] Step 205: Determine the time history curve of bridge displacement under the heavy traffic flow according to the bridge displacement increment result in the dynamic response result of the bridge under the heavy traffic flow state.

[0035] The beneficial effects of the present invention are that the design is novel and reasonable, the lateral overturning of the bridge can be monitored in real time, the vehicles on the bridge can be controlled in real time, and the automatic vehicle guard mechanism is installed at the expansion joint, which neither affects the traffic nor takes up space, and is easy to operate; the dynamic response calculation results of the bridge under random traffic flow are compared with the actual bridge monitoring results, and different safety factor values ​​are used to give early warnings to vehicles running on the bridge, which provides a certain reference for bridge structure damage and operational safety assessment, has high reliability, provides a reference for bridge safe operation and function assessment, and is easy to promote and use.

[0036] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the cross-section structure of the bridge of the present invention.

[0038] Figure 2 This is a usage status diagram of the early warning device of the present invention.

[0039] Figure 3 It is a structural schematic diagram of the automatic guarding mechanism of the present invention.

[0040] Figure 4 It is a flowchart of the method of the present invention.

[0041] Description of reference numerals:

[0042] 1—bridge pier; 2—displacement meter; 3—strain meter;

[0043] 4—pressure gauge; 5—wide-angle camera; 6—main bridge;

[0044] 7—approach bridge; 8—bridge expansion joint; 9—guardrail;

[0045] 10—flow diversion indicator; 11—first telescopic rod; 12—gear lever;

[0046] 13—Automatic guard mechanism; 13-1—Steel bottom plate; 13-2—Steel baffle;

[0047] 13-2—Second telescopic rod. DETAILED DESCRIPTION

[0048] like Figures 1 to 3 As shown, the lateral overturning warning device of a bridge under heavy-load traffic of the present invention comprises a control terminal, a detection mechanism symmetrically installed on both sides of a bridge pier 1, a flow guide mechanism installed on guardrails 9 on both sides of the bridge, a stopper 12 installed on both sides of an approach bridge 7, and an automatic guarding mechanism 13 installed in a bridge expansion joint 8 between the approach bridge 7 and a main bridge 6;

[0049] The detection mechanism includes a displacement meter 2, a strain meter 3 and a pressure meter 4 arranged from the inside to the outside between the pier 1 and the bridge;

[0050] The diversion mechanism includes a diversion indicator 10 and a first telescopic rod 11 for driving the diversion indicator 10 to extend to limit the traffic flow of the corresponding side lane;

[0051] The automatic guardrail mechanism 13 includes a plurality of automatic guardrail units installed in the expansion joint 8 of the bridge and used to block the passage of vehicles on the corresponding lanes. The automatic guardrail units include a steel base plate 13-1 and a steel baffle 13-2 hinged to the steel base plate 13-1. A second telescopic rod 13-3 for lifting or retracting the steel baffle 13-2 is provided on the steel base plate 13-1.

[0052] In this embodiment, the guardrail 9 is provided with a plurality of wide-angle cameras 5 along the length direction.

[0053] In this embodiment, a display screen for information reminder and early warning information is provided on the approach bridge 7.

[0054] like Figure 4 The method for early warning of lateral overturning of a bridge under heavy traffic is characterized in that the method comprises the following steps:

[0055] Step 1: Real-time collection of heavy-load traffic on the bridge;

[0056] Step 2: Obtain the dynamic response result of the bridge under the heavy traffic flow state, and determine the displacement time history curve of the bridge under the heavy traffic flow;

[0057] Step 3: Use the bridge lateral overturning warning device under heavy traffic to monitor the bridge in real time, and collect the actual dynamic response amplitude of the bridge in real time;

[0058] Step 4: According to the formula Calculate the bridge lateral warning safety factor a, where A b is the measured dynamic response amplitude of the bridge, A t The dynamic response amplitude of the bridge theoretically calculated given by the time history curve of bridge displacement under heavy traffic flow;

[0059] Step 5: Obtain the warning level of lateral overturning of the bridge under heavy traffic flow and perform corresponding warning protection. The process is as follows:

[0060] When the bridge's lateral warning safety factor a≥1.5, the bridge's lateral overturning warning level under heavy traffic reaches level one, and bridge warning control protection is performed. The wide-angle camera 5, displacement meter 2, strain meter 3 and pressure meter 4 are used to obtain the bridge's lateral overturning direction. The bridge's lateral overturning direction is the side where the data collected by the displacement meter 2, strain meter 3 and pressure meter 4 on the corresponding side increases. At this time, the gear lever 12 corresponding to the bridge side where the data collected by the displacement meter 2, strain meter 3 and pressure meter 4 increases is activated to reduce the traffic volume in the lane on the corresponding side; at the same time, the first telescopic rod 11 corresponding to the bridge side where the data collected by the displacement meter 2, strain meter 3 and pressure meter 4 increases is extended, and the diversion indicator 10 guides the vehicle to change lanes to reduce the traffic volume in the lane on the corresponding side; the automatic guard unit installed at the expansion joint on the corresponding lane is activated in real time to prevent vehicles from passing through the lane on the corresponding side;

[0061] When the bridge lateral warning safety factor is 1.2<a<1.5, the bridge lateral overturning warning level under heavy traffic reaches level 2, and the monitoring frequency is increased. The lateral overturning trend of the bridge is obtained through the wide-angle camera 5, displacement meter 2, strain gauge 3 and pressure gauge 4, and lane suggestions are given through the display screen for information reminder and warning information set on the approach bridge 7;

[0062] When the lateral warning safety factor of the bridge a≤1.2, the lateral overturning warning level of the bridge under heavy traffic is level three, and normal warning monitoring of the bridge is carried out.

[0063] In this embodiment, in step five, when the lateral warning safety factor a of the bridge is ≥1.5, the lateral overturning warning level of the bridge under heavy traffic reaches level one, and bridge warning control protection is performed. When the lateral warning safety factor a of the bridge is reduced to 1.2, the guide mechanism, the gear lever 12 and the automatic guard mechanism 13 return to the initial state, and the display screen displays the return to normal instruction.

[0064] In this embodiment, in step 1, the heavy-load traffic on the bridge includes the number of vehicles on each lane of the bridge, the driving distance between vehicles, the type of vehicles and the driving speed.

[0065] In this embodiment, in step 2, obtaining the dynamic response result of the bridge under the heavy traffic flow state and determining the displacement time history curve of the bridge under the heavy traffic flow includes the following steps:

[0066] Step 201: Construct the vehicle-bridge coupling matrix under the current heavy-load vehicle flow state and solve the corresponding bridge dynamic response increment in, is the vehicle mass matrix under the current heavy-load traffic state, M B is the bridge mass matrix, is the vehicle damping matrix under the current heavy traffic state, C B is the bridge damping matrix, is the bridge damping coupling matrix under the current heavy traffic state; is the bridge-vehicle damping coupling matrix under the current heavy traffic state, is the vehicle stiffness matrix under the current heavy-load traffic state, K B is the bridge stiffness matrix, is the bridge stiffness coupling matrix under the current heavy traffic state, is the bridge-vehicle stiffness coupling matrix under the current heavy-load traffic state, is the external force matrix of the vehicle under the current heavy traffic state, is the external force matrix of the bridge under the current heavy traffic state;

[0067] Y i is the vehicle displacement increment matrix under the current heavy traffic state, is the vehicle speed increment matrix under the current heavy traffic state, is the vehicle acceleration increment matrix under the current heavy traffic state;

[0068] Q i is the incremental matrix of bridge displacement under the current heavy traffic state, is the bridge speed increment matrix under the current heavy traffic state, is the incremental matrix of bridge acceleration under the current heavy traffic state;

[0069] The bridge displacement increment matrix, bridge velocity increment matrix and bridge acceleration increment matrix constitute the bridge dynamic response increment;

[0070] Step 202, obtaining the dynamic response result of the bridge under the current heavy-load traffic state: the initial state of the heavy-load traffic on the bridge is a 0 vector, and the dynamic response increment of the bridge under the current heavy-load traffic state is accumulated to obtain the dynamic response result of the bridge under the current heavy-load traffic state;

[0071] Step 203: Collect the heavy-loaded traffic on the bridge at the next moment, construct the vehicle-bridge coupling matrix under the heavy-loaded traffic state at the next moment, and solve the corresponding bridge dynamic response increment in, is the vehicle mass matrix under the heavy-load traffic state at the next moment, is the vehicle damping matrix under the heavy traffic state at the next moment, is the bridge damping coupling matrix under the heavy traffic state at the next moment; is the bridge-vehicle damping coupling matrix under the heavy traffic state at the next moment, is the vehicle stiffness matrix under the heavy-load traffic state at the next moment, is the bridge stiffness coupling matrix under the heavy traffic state at the next moment, is the bridge-vehicle stiffness coupling matrix under the heavy traffic state at the next moment, is the external force matrix of the vehicle under the heavy traffic state at the next moment, is the external force matrix of the bridge under the heavy traffic state at the next moment;

[0072] Y i+1 is the vehicle displacement increment matrix under the heavy traffic state at the next moment, is the vehicle speed increment matrix under the heavy traffic state at the next moment, The vehicle acceleration increment matrix under the heavy-load traffic state at the next moment;

[0073] Q i+1 is the incremental matrix of bridge displacement under heavy traffic conditions at the next moment, is the bridge speed increment matrix under the heavy traffic state at the next moment, The incremental matrix of bridge acceleration under heavy traffic condition at the next moment;

[0074] Step 204: Obtain the dynamic response result of the bridge under the heavy traffic state at the next moment:

[0075] At the next moment, the incremental displacement matrix Q of the bridge under the heavy traffic state i+1 and the bridge displacement increment matrix Q under the current heavy traffic state iWhen the dimensions are consistent, the dynamic response increment of the bridge under the heavy traffic state at the next moment is accumulated to obtain the dynamic response result of the bridge under the heavy traffic state at the next moment;

[0076] At the next moment, the incremental displacement matrix Q of the bridge under the heavy traffic state i+1 and the bridge displacement increment matrix Q under the current heavy traffic state i When the dimensions are inconsistent and there are new vehicles on the bridge, the last bit of the matrix corresponding to the dynamic response result of the bridge under the current heavy traffic state is filled with 0, and then it is accumulated with the dynamic response increment of the bridge under the heavy traffic state at the next moment to obtain the dynamic response result of the bridge under the heavy traffic state at the next moment;

[0077] At the next moment, the incremental displacement matrix Q of the bridge under the heavy traffic state i+1 and the bridge displacement increment matrix Q under the current heavy traffic state i When the dimensions are inconsistent and there are vehicles going down the bridge, the first digit of the matrix corresponding to the dynamic response result of the bridge under the current heavy traffic state is filled with 0, and then it is accumulated with the dynamic response increment of the bridge under the heavy traffic state at the next moment to obtain the dynamic response result of the bridge under the heavy traffic state at the next moment;

[0078] Step 205: Determine the time history curve of bridge displacement under the heavy traffic flow according to the bridge displacement increment result in the dynamic response result of the bridge under the heavy traffic flow state.

[0079] When the present invention is used, the detection mechanism is symmetrically installed on both sides of the pier 1. When the data collected by the displacement meter 2, strain gauge 3 and pressure gauge 4 on the left side increases, it means that the bridge has the risk of overturning to the left. When the data collected by the displacement meter 2, strain gauge 3 and pressure gauge 4 on the right side increases, it means that the bridge has the risk of overturning to the right. When there is a risk of lateral overturning of the bridge, the gear lever 12 prevents vehicles on the corresponding side from getting on the bridge, the guide mechanism guides the vehicle to change lanes, reduces the pressure on the bridge deck on the corresponding side, and the automatic guard unit prevents vehicles from communicating in the risk lane to block the risk. The lateral overturning warning device of the bridge under heavy traffic can monitor the lateral overturning of the bridge in real time, and conduct real-time control of the vehicles on the bridge. The automatic guard mechanism of the vehicle is installed at the expansion joint, which neither affects the traffic nor takes up space, and is convenient for operation. The dynamic response calculation results of the bridge under random traffic are compared with the actual bridge monitoring results, and different safety factor values ​​are used to warn the vehicles running on the bridge, which provides a certain reference for the damage to the bridge structure and the operation safety assessment. It has high reliability and provides a reference for the safe operation and function assessment of the bridge.

[0080] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A bridge lateral overturning warning device under heavy traffic, characterized by: It comprises a control terminal, a detection mechanism symmetrically installed on both sides of a bridge pier (1), a flow guide mechanism installed on guardrails (9) on both sides of the bridge, a barrier rod (12) installed on both sides of an approach bridge (7), and an automatic barrier mechanism (13) installed in a bridge expansion joint (8) between the approach bridge (7) and a main bridge (6); The detection mechanism comprises a displacement meter (2), a strain meter (3) and a pressure meter (4) which are arranged from the inside to the outside between the pier (1) and the bridge; The diversion mechanism comprises a diversion indicator (10) and a first telescopic rod (11) used for driving the diversion indicator (10) to extend to limit the traffic flow of the corresponding side lane; The automatic guarding mechanism (13) comprises a plurality of automatic guarding units installed in the expansion joint (8) of the bridge and used to block the passage of vehicles on the corresponding lanes. The automatic guarding units comprise a steel base plate (13-1) and a steel baffle plate (13-2) hinged to the steel base plate (13-1). A second telescopic rod (13-3) for raising or retracting the steel baffle plate (13-2) is arranged on the steel base plate (13-1).

2. A bridge lateral overturning warning device under heavy-load traffic according to claim 1, characterized in that: The guardrail (9) is provided with a plurality of wide-angle cameras (5) along the length direction.

3. A bridge lateral overturning warning device under heavy-load traffic according to claim 1, characterized in that: The approach bridge (7) is provided with a display screen for information reminder and early warning information.

4. A method for early warning of lateral overturning of a bridge under heavy traffic using the device as claimed in claim 2, characterized in that: The method comprises the following steps: Step 1: Real-time collection of heavy-load traffic on the bridge; Step 2: Obtain the dynamic response result of the bridge under the heavy traffic flow state, and determine the displacement time history curve of the bridge under the heavy traffic flow; Step 3: Use the bridge lateral overturning warning device under heavy traffic to monitor the bridge in real time, and collect the actual dynamic response amplitude of the bridge in real time; Step 4: According to the formula Calculate the bridge lateral warning safety factor a, where A b is the measured dynamic response amplitude of the bridge, A t The dynamic response amplitude of the bridge theoretically calculated given by the time history curve of bridge displacement under heavy traffic flow; Step 5: Obtain the warning level of lateral overturning of the bridge under heavy traffic flow and perform corresponding warning protection. The process is as follows: When the bridge lateral warning safety factor a≥1.5, the bridge lateral overturning warning level under heavy traffic reaches level one, and bridge warning control protection is performed. The lateral overturning direction of the bridge is obtained through the wide-angle camera (5), displacement meter (2), strain meter (3) and pressure meter (4). The lateral overturning direction of the bridge is the side where the data collected by the displacement meter (2), strain meter (3) and pressure meter (4) on the corresponding side increases. At this time, the gear lever (12) corresponding to the side of the bridge where the data collected by the displacement meter (2), strain meter (3) and pressure meter (4) increases is activated to reduce the traffic volume of the lane on the corresponding side; at the same time, the first telescopic rod (11) corresponding to the side of the bridge where the data collected by the displacement meter (2), strain meter (3) and pressure meter (4) increases is extended, and the diversion indicator (10) guides the vehicle to change lanes to reduce the traffic volume of the lane on the corresponding side; the automatic guard unit installed at the expansion joint on the corresponding lane is activated in real time to prevent vehicles from passing through the lane on the corresponding side; When the bridge lateral warning safety factor is 1.2<a<1.5, the bridge lateral overturning warning level under heavy traffic reaches level 2, and the monitoring frequency is increased. The lateral overturning trend of the bridge is obtained through a wide-angle camera (5), a displacement meter (2), a strain gauge (3) and a pressure gauge (4), and a lane suggestion is given through a display screen for information reminder and warning information provided on the approach bridge (7); When the bridge's lateral warning safety factor a≤1.2, the bridge's lateral overturning warning level under heavy traffic is level three, and normal bridge warning monitoring is carried out.

5. The method for early warning of lateral overturning of a bridge under heavy traffic according to claim 4, characterized in that: In step five, when the bridge lateral warning safety factor a≥1.5, the bridge lateral overturning warning level under heavy traffic reaches level one, and bridge warning control protection is performed. When the bridge lateral warning safety factor a decreases to 1.2, the guide mechanism, the gear lever (12) and the automatic guard mechanism (13) return to the initial state, and the display screen displays the return to normal instruction.

6. The method for early warning of lateral overturning of a bridge under heavy traffic according to claim 4, characterized in that: In step 1, the heavy traffic flow on the bridge includes the number of vehicles on each lane of the bridge, the driving distance between vehicles, the type of vehicles and the driving speed.

7. The method for early warning of lateral overturning of a bridge under heavy traffic according to claim 4, characterized in that: In step 2, the dynamic response result of the bridge under the heavy traffic flow state is obtained, and the displacement time history curve of the bridge under the heavy traffic flow is determined, including the following steps: Step 201: Construct the vehicle-bridge coupling matrix under the current heavy-load vehicle flow state and solve the corresponding bridge dynamic response increment in, is the vehicle mass matrix under the current heavy-load traffic state, M B is the bridge mass matrix, is the vehicle damping matrix under the current heavy traffic state, C B is the bridge damping matrix, is the bridge damping coupling matrix under the current heavy traffic state; is the bridge-vehicle damping coupling matrix under the current heavy traffic state, is the vehicle stiffness matrix under the current heavy-load traffic state, K B is the bridge stiffness matrix, is the bridge stiffness coupling matrix under the current heavy traffic state, is the bridge-vehicle stiffness coupling matrix under the current heavy-load traffic state, is the external force matrix of the vehicle under the current heavy-load traffic state, is the external force matrix of the bridge under the current heavy traffic state; Y i is the vehicle displacement increment matrix under the current heavy traffic state, is the vehicle speed increment matrix under the current heavy traffic state, is the vehicle acceleration increment matrix under the current heavy traffic state; Q i is the incremental matrix of bridge displacement under the current heavy traffic state, is the bridge speed increment matrix under the current heavy traffic state, is the incremental matrix of bridge acceleration under the current heavy traffic state; The bridge displacement increment matrix, bridge velocity increment matrix and bridge acceleration increment matrix constitute the bridge dynamic response increment; Step 202, obtaining the dynamic response result of the bridge under the current heavy-load traffic state: the initial state of the heavy-load traffic on the bridge is a 0 vector, and the dynamic response increment of the bridge under the current heavy-load traffic state is accumulated to obtain the dynamic response result of the bridge under the current heavy-load traffic state; Step 203: Collect the heavy traffic flow on the bridge at the next moment, construct the vehicle-bridge coupling matrix under the heavy traffic flow state at the next moment, and solve the corresponding bridge dynamic response increment in, is the vehicle mass matrix under the heavy-load traffic state at the next moment, is the vehicle damping matrix under the heavy traffic state at the next moment, is the bridge damping coupling matrix under the heavy traffic state at the next moment; is the bridge-vehicle damping coupling matrix under the heavy traffic state at the next moment, is the vehicle stiffness matrix under the heavy-load traffic state at the next moment, is the bridge stiffness coupling matrix under the heavy traffic state at the next moment, is the bridge-vehicle stiffness coupling matrix under the heavy traffic state at the next moment, is the external force matrix of the vehicle under the heavy traffic state at the next moment, is the external force matrix of the bridge under the heavy traffic state at the next moment; Y i+1 is the vehicle displacement increment matrix under the heavy traffic state at the next moment, is the vehicle speed increment matrix under the heavy traffic state at the next moment, The vehicle acceleration increment matrix under the heavy-load traffic state at the next moment; Q i+1 is the incremental matrix of bridge displacement under heavy traffic conditions at the next moment, is the bridge speed increment matrix under the heavy traffic state at the next moment, The incremental matrix of bridge acceleration under heavy traffic condition at the next moment; Step 204: Obtain the dynamic response result of the bridge under the heavy traffic state at the next moment: At the next moment, the incremental displacement matrix Q of the bridge under the heavy traffic state i+1 and the bridge displacement increment matrix Q under the current heavy traffic state i When the dimensions are consistent, the dynamic response increment of the bridge under the heavy traffic state at the next moment is accumulated to obtain the dynamic response result of the bridge under the heavy traffic state at the next moment; At the next moment, the incremental displacement matrix Q of the bridge under the heavy traffic state i+1 and the bridge displacement increment matrix Q under the current heavy traffic state i When the dimensions are inconsistent and there are new vehicles on the bridge, the last bit of the matrix corresponding to the dynamic response result of the bridge under the current heavy traffic state is filled with 0, and then it is accumulated with the dynamic response increment of the bridge under the heavy traffic state at the next moment to obtain the dynamic response result of the bridge under the heavy traffic state at the next moment; At the next moment, the incremental displacement matrix Q of the bridge under the heavy traffic state i+1 and the bridge displacement increment matrix Q under the current heavy traffic state i When the dimensions are inconsistent and there are vehicles going down the bridge, the first digit of the matrix corresponding to the dynamic response result of the bridge under the current heavy traffic state is filled with 0, and then it is accumulated with the dynamic response increment of the bridge under the heavy traffic state at the next moment to obtain the dynamic response result of the bridge under the heavy traffic state at the next moment; Step 205: Determine the time history curve of bridge displacement under the heavy traffic flow according to the bridge displacement increment result in the dynamic response result of the bridge under the heavy traffic flow state.

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