An emergency mechanical bridge retraction system and retraction method

Abstract

The present invention discloses an emergency mechanized bridge retraction system and a retraction method, belonging to the technical field of emergency mechanized bridges. The retraction system includes a bridge erection vehicle, a centering camera, a display device, and a control device. Among them, an erection mechanism and outriggers are provided in the front of the bridge erection vehicle; the centering camera is fixedly installed in the front of the bridge erection vehicle, and the centering camera is provided with a horizontal alignment reference line and is signal-connected to the display device, capable of capturing images of the bridge span in real time and transmitting the images of the bridge span to the display device in real time; the display device is fixedly installed in the cab of the bridge erection vehicle, capable of displaying the relative position of the image of the bridge span and the horizontal alignment reference line in real time; with the assistance of the display device, the driver issues a control command to the control device through the control device, controlling the erection mechanism and the outriggers to swing by a preset angle. This retraction system can efficiently complete the emergency bridge retraction operation without the assistance of outsiders during the operation with the cabin closed.

Description

Technical Field

[0001] The present invention belongs to the technical field of emergency mechanized bridges, and particularly relates to an emergency mechanized bridge retraction system and a retraction method. Background Art

[0002] When retracting an emergency mechanized bridge, a bridging vehicle is required to perform a closed-cabin retraction operation. For example, the publication number is CN109505253A, and the invention name is an erection mechanism for an extra-large-span mechanized bridge. It discloses that when it is necessary to pick up the bridge, the piston rod of the tilting oil cylinder is also controlled to extend, so that the erection frame rotates around the pin shaft connecting it to the platform. After placing the end of the mechanized bridge on the roller group of the erection frame, the piston rod of the tilting oil cylinder is controlled to retract, so that the erection frame rotates reversely around the pin shaft connecting it to the platform to realize the bridge picking-up. During this closed-cabin bridge-picking-up process, someone other than the driver needs to observe and command the reversing distance and angle of the bridging vehicle until the rollers on the erection mechanism of the bridging vehicle smoothly enter the bridge span slideway, and then enter the next operation process. If there is no manual auxiliary command during the closed-cabin bridge-picking-up, it is very difficult to achieve the bridge span centering and bridge retraction operation (that is, it is very difficult for the rollers to smoothly roll into the bridge span slideway), which undoubtedly increases the operation time of the closed-cabin bridge-picking-up and the operation efficiency is low. Summary of the Invention

[0003] In view of this, the present invention provides an emergency mechanized bridge retraction system and a retraction method, which solve the problem that when retracting an emergency mechanized bridge in a closed cabin, someone else needs to assist in guiding to make the rollers on the erection mechanism smoothly roll into the slideway of the bridge span.

[0004] The emergency mechanized bridge retraction system adopts the following technical solutions:

[0005] An emergency mechanized bridge retraction system includes a bridging vehicle, a centering camera, a display device, and a control device;

[0006] An erection mechanism capable of swinging up and down relative to the chassis of the bridging vehicle is provided in the front of the bridging vehicle for retracting the bridge span on the ground to the chassis of the bridging vehicle, and the bridging vehicle is also provided with legs for supporting;

[0007] The centering camera is fixedly installed in the front of the bridging vehicle. The centering camera is provided with a horizontal alignment reference line and is signal-connected to the display device, and can capture the image of the bridge span in real time and transmit the image of the bridge span to the display device in real time;

[0008] The display device is fixedly installed in the driver's cab of the bridging vehicle and can display the relative position of the image of the bridge span and the horizontal alignment reference line in real time, and is used to assist the driver in judging the distance between the bridge span and the bridging vehicle;

[0009] The control device is in signal connection with the control devices in the cockpit and the erection mechanism. With the assistance of the display device, the driver issues a control instruction to the control device through the control device. After receiving the control instruction, the control device can control the erection mechanism and the outriggers to swing by a preset angle.

[0010] Further, there are three horizontal alignment reference lines, namely a first horizontal alignment reference line, a second horizontal alignment reference line, and a third horizontal alignment reference line that are parallel to each other.

[0011] When the bridge erection vehicle approaches the bridge span, one end of the bridge span close to the bridge erection vehicle coincides with the first horizontal alignment reference line, the second horizontal alignment reference line, and the third horizontal alignment reference line in sequence.

[0012] Further, the erection mechanism is a front cantilever.

[0013] One end of the front cantilever is hinged to the front of the bridge erection vehicle, and the other end extends forward along the longitudinal central axis of the bridge erection vehicle towards the front of the vehicle head of the bridge erection vehicle. The front cantilever is provided with rollers that can roll in the slideway of the bridge span.

[0014] Further, the system further includes a roller monitoring camera that is in signal connection with the display device.

[0015] The roller monitoring camera is fixedly installed on the front cantilever, can capture images of the rollers in real time, and can transmit the images of the rollers to the display device in real time for assisting the driver to dock the rollers with the slideway of the bridge span.

[0016] Further, the system further includes an outrigger monitoring camera that is in signal connection with the display device.

[0017] The outrigger monitoring camera is fixedly installed on the bridge erection vehicle, can capture images of the outriggers in real time, and can transmit the images of the outriggers to the display device in real time for assisting the driver to judge the position of the outriggers relative to the bridge span.

[0018] Further, the system further includes a laser indicator.

[0019] The laser indicator is fixedly arranged on the front cantilever. When the front cantilever swings to a preset angle, the laser emitted by the laser indicator can hit a preset marked position on the bridge span for assisting the driver to judge whether the front cantilever has swung to the preset angle.

[0020] Further, the outrigger is a support shovel.

[0021] In addition, the present invention also provides an emergency mechanized bridge retraction method based on the above-mentioned emergency mechanized bridge retraction system. The retraction method adopts the following technical solutions:

[0022] An emergency mechanized bridge retraction method, adopting the above-mentioned emergency mechanized bridge retraction system, includes the following steps:

[0023] Step 1: Control the bridge erection vehicle to approach the emergency mechanized bridge;

[0024] Step 2: When one end of the emergency mechanized bridge coincides with the horizontal alignment reference line, send a control command to the control device through the control device to control the lower swing and upper swing of the erection mechanism, so as to retract the bridge span to the bridge erection vehicle.

[0025] Further, the above-mentioned Step 2 specifically includes:

[0026] Step 201: When one end of the bridge span coincides with the first horizontal alignment reference line, send a control command to the control device through the control device to control the lower swing of the erection mechanism by a preset angle, so that the roller is aligned with the slideway;

[0027] Step 202: The driver continues to drive the bridge erection vehicle to approach the bridge span, so that the roller rolls into the slideway;

[0028] Step 203: When one end of the bridge span coincides with the second horizontal alignment reference line, the driver sends a control command to the control device through the control device to control the upper swing of the erection mechanism by a preset angle, so that one end of the bridge span is lifted;

[0029] Step 204: The driver continues to drive the bridge erection vehicle to approach the bridge span;

[0030] Step 205: When one end of the bridge span coincides with the third horizontal alignment reference line and the bridge span is completely lifted, the driver sends a control command to the control device through the control device to control the outrigger to swing down and support on the ground.

[0031] Further, the driver also selects reference objects on the left and right sides of the longitudinal central axis of the bridge span to align the rollers with the slideway left and right.

[0032] Beneficial effects:

[0033] (1) The centering camera is fixedly installed in the due front of the bridge erection vehicle. The centering camera is provided with a horizontal alignment reference line and is signal-connected to the display device. It can capture the image of the bridge span in real time and transmit the image of the bridge span to the display device in real time. The display device is fixedly installed in the cab of the bridge erection vehicle and can display the relative position of the image of the bridge span and the horizontal alignment reference line in real time, which is used to assist the driver in judging the distance between the bridge span and the bridge erection vehicle. The control device is signal-connected to the control device and the erection mechanism in the cab. With the assistance of the display device, the driver issues a control command to the control device through the control device. After receiving the control command, the control device can control the erection mechanism and the outriggers of the bridge erection vehicle to swing by a preset angle, so as to lift the bridge span, enabling the driver to efficiently complete the emergency bridge removal operation without the assistance of outsiders during the operation with the cab closed.

[0034] (2) There are three horizontal alignment reference lines, namely the first horizontal alignment reference line, the second horizontal alignment reference line, and the third horizontal alignment reference line that are parallel to each other. When the bridge erection vehicle approaches the bridge span, one end of the bridge span close to the bridge erection vehicle coincides with the first horizontal alignment reference line, the second horizontal alignment reference line, and the third horizontal alignment reference line in sequence, enabling the driver to take different corresponding operations according to the different distances between the bridge span and the bridge erection vehicle, making the removal of the emergency mechanized bridge more systematic, standardized, and efficient.

[0035] (3) The erection mechanism is a front cantilever. One end of the front cantilever is fixedly installed at the front of the bridge erection vehicle, and the other end extends forward along the longitudinal central axis of the bridge erection vehicle towards the front of the bridge erection vehicle. The front cantilever is provided with rollers, and the rollers can roll in the slideway of the bridge span. In this way, when the bridge erection vehicle is retracting with the cab closed, the driver can drive the bridge erection vehicle forward towards the bridge span, and when the bridge erection vehicle approaches the bridge span, the front cantilever can also extend into the slideway of the bridge span. The driver has a large observation field of view, which is convenient for the closed-cab retraction of the emergency mechanized bridge.

[0036] (4) The roller monitoring camera is fixedly installed on the front cantilever, can capture the image of the roller in real time, and can transmit the image of the roller to the display device in real time, enabling the driver to observe the relative position of the roller and the bridge span slideway on the display device in the cab in real time, improving the reliability of the closed-cab retraction of the emergency mechanized bridge.

[0037] (5) The outrigger monitoring camera is fixedly installed on the bridge erection vehicle, can capture the image of the outrigger in real time, and can transmit the image of the outrigger to the display device in real time, which is used to assist the driver in judging the position of the outrigger and the bridge span, enabling the driver to comprehensively master the external environment of the bridge erection vehicle and further improving the reliability of the closed-cab retraction of the emergency mechanized bridge.

[0038] (6) The laser indicator is fixedly installed on the front cantilever. When the front cantilever swings to a preset angle, the laser emitted by the laser indicator can hit a preset marked position on the bridge span, which is used to assist the driver in judging whether the front cantilever swings to the preset angle, further improving the reliability of the emergency mechanized bridge's closed-cabin retraction.

[0039] (7) The outrigger is of a support shovel structure, enabling the outrigger to not only play a supporting role during the closed-cabin retraction process of the bridge span but also perform earthwork operations, facilitating the closed-cabin retraction operation of the emergency mechanized bridge.

[0040] (8) For this emergency mechanized bridge retraction method, when one end of the emergency mechanized bridge coincides with the horizontal alignment reference line, the driver issues a control command to the control device through the control device to control the lower swing and upper swing of the erection mechanism. With the assistance of the horizontal reference line, it is possible to systematically and standardly complete the closed-cabin retraction of the bridge span without overly relying on the driver's experience, saving operation time.

[0041] (9) When one end of the bridge span coincides with the first horizontal alignment reference line, the driver issues a control command to the control device through the control device to control the erection mechanism to swing downward by a preset angle, aligning the rollers with the slideway. Then the driver continues to drive the bridge erecting vehicle closer to the bridge span, causing the rollers to roll into the slideway. When one end of the bridge span coincides with the second horizontal alignment reference line, the driver issues a control command to the control device through the control device to control the erection mechanism to swing upward by a preset angle, lifting one end of the bridge span. Then the driver continues to drive the bridge erecting vehicle closer to the bridge span. When one end of the bridge span coincides with the third horizontal alignment reference line, the entire bridge span is lifted. The driver issues a control command to the control device through the control device to control the outrigger to swing downward and support on the ground, and then the entire bridge span can be retracted onto the chassis of the bridge erecting vehicle. During this closed-cabin retraction process, the driver can take corresponding operations according to the display of the bridge span and each horizontal alignment reference line in the driver's cab, which is simple and efficient.

[0042] (10) The driver also selects reference objects on both the left and right sides of the longitudinal central axis of the bridge span to align the rollers with the slideway left and right, so that the rollers can more conveniently extend into the slideway of the bridge span, achieving the centered retraction of the bridge span (aligned in both the left-right direction and the horizontal direction). Description of the Drawings

[0043] Figure 1 Schematic diagram of the closed-cabin retraction operation using the emergency mechanized bridge retraction system of the present invention;

[0044] Figure 2 For Figure 1 Structural schematic diagram of the bridge erecting vehicle in

[0045] Figure 3 For Figure 2 Top view of the bridge erecting vehicle in

[0046] Figure 4 A schematic diagram of a display device showing a bridge span and a first horizontal alignment reference line;

[0047] Figure 5 A schematic diagram of a display device showing a bridge span and a second horizontal alignment reference line;

[0048] Figure 6 A schematic diagram of a display device showing a bridge span and a third horizontal alignment reference line;

[0049] Wherein, 1 - bridge erection vehicle, 101 - front cantilever, 102 - support shovel, 103 - bridge pushing motor, 2 - bridge span, 3 - display device, 301 - display screen, 302 - control button. Detailed implementation manners

[0050] The present invention will be described in detail below with reference to the accompanying drawings and by way of examples.

[0051] Example 1:

[0052] This example provides an emergency mechanized bridge withdrawal system, as Figures 1 to 6 shown, the withdrawal system includes a bridge erection vehicle 1, a centering camera, a display device 3 and a control device, wherein:

[0053] In front of the bridge erection vehicle 1, there is an erection mechanism that can swing up and down relative to the chassis of the bridge erection vehicle 1. In this embodiment, the erection mechanism is exemplified by the front cantilever 101. One end of the front cantilever 101 is hinged to the front of the bridge erection vehicle 1, and the other end extends forward along the longitudinal central axis of the bridge erection vehicle 1 towards the front of the vehicle head. The front cantilever 101 is provided with rollers that can roll in the slideway of the bridge span 2. A bridge pushing motor 103 is also provided in the front cantilever 102. The front cantilever 101 is used to retract the bridge 2 on the ground to the chassis of the bridge erection vehicle 1. The bridge erection vehicle 1 is also provided with outriggers for support. In this embodiment, the outrigger is specifically a support shovel 102. The alignment camera is fixedly installed in front of the bridge erection vehicle 1. The alignment camera is provided with a horizontal alignment reference line and is signal-connected to the display device 3. It can capture the image of the bridge span 2 in real time and transmit the image of the bridge span 2 to the display device 3 in real time. The display device 3 is fixedly installed in the cab of the bridge erection vehicle 1 and can display the relative position of the image of the bridge span 2 and the horizontal alignment reference line in real time, which is used to assist the driver in judging the distance between the bridge span 2 and the bridge erection vehicle 1. The control device is fixedly installed on the bridge erection vehicle 1, and the control device is signal-connected to the control device in the cab and the erection mechanism. With the assistance of the display device 3, the driver issues a control command to the control device through the control device. After receiving the control command, the control device can control the erection mechanism and the support shovel 2 to swing a preset angle. In this embodiment, the control device is a PLC. An angle sensor for detecting its swing angle is provided on the support shovel 102, and a rotary encoder for detecting its swing angle is provided on the front cantilever 101. The PLC is signal-connected to the angle sensor and the rotary encoder. The detection data of the angle sensor and the rotary encoder can be sent to the PLC. The PLC compares the received detection data with the preset data. When the detection data is equal to the preset data, the PLC sends a stop work command to the drive devices of the front cantilever 101 and the support shovel 102, so that the front cantilever 101 and the support shovel 102 rotate a preset angle. In this embodiment, the working environment temperature of the sensor and the camera is: -30°C to +45°C, the range of the angle sensor is 117°, and the range of the rotary encoder is 360°.

[0054] In this way, the centering camera is fixedly installed in the front of the bridge erection vehicle 1. The centering camera is provided with a horizontal alignment reference line and is signal-connected to the display device 3. It can capture images of the bridge span 2 in real time and transmit the images of the bridge span 2 to the display device 3 in real time. The display device 3 is fixedly installed in the cab of the bridge erection vehicle 1 and can display the relative position between the image of the bridge span 2 and the horizontal alignment reference line in real time, which is used to assist the driver in judging the distance between the bridge span 2 and the bridge erection vehicle 1. The control device is signal-connected to the control device and the erection mechanism in the cab. With the assistance of the display device, the driver issues control commands to the control device through the control device. After receiving the control commands, the control device can control the erection mechanism and the legs of the bridge erection vehicle 2 to swing by a preset angle, so as to lift the bridge span 2, enabling the driver to efficiently complete the emergency bridge retraction operation without the assistance of outsiders during the closed-cabin operation process.

[0055] In this embodiment, specifically, as Figures 3 to 6 shown, the display device 3 includes a display screen 301 and control buttons 302, and there are three horizontal alignment reference lines. In the display screen 301, from top to bottom, they are the mutually parallel first horizontal alignment reference line, the second horizontal alignment reference line, and the third horizontal alignment reference line. The first horizontal alignment reference line and the third horizontal alignment reference line form an isosceles trapezoid. During the process of the bridge erection vehicle 1 continuously approaching the bridge span 2, the moving path of the bridge span 2 in the display screen 301 is an isosceles trapezoid. That is, when the bridge erection vehicle 1 approaches the bridge span 2, the end of the bridge span 2 close to the bridge erection vehicle 1 will coincide with the first horizontal alignment reference line, the second horizontal alignment reference line, and the third horizontal alignment reference line in sequence. Because the coincidence with different horizontal alignment reference lines indicates different distances between the bridge erection vehicle 1 and the bridge span 2, at this time, the driver can take corresponding operations according to the coincidence of the bridge span 2 with different horizontal alignment lines, making the retraction of the emergency mechanized bridge more systematic, standardized, and efficient.

[0056] As an improvement, in this retraction system, there is also a roller monitoring camera signal-connected to the display device 3. The roller monitoring camera is fixedly installed on the front cantilever 101, can capture images of the rollers in real time, and can transmit the images of the rollers to the display device 3 in real time, which is used to assist the driver in docking the rollers with the slideway of the bridge span 2.

[0057] Moreover, in this retraction system, there is also a leg monitoring camera signal-connected to the display device 3. The leg monitoring camera is fixedly installed on the bridge erection vehicle 1, can capture images of the legs in real time, and can transmit the images of the legs to the display device 3 in real time, which is used to assist the driver in judging the relative position between the legs and the bridge span 2, enabling the driver to more comprehensively grasp the external environment of the bridge erection vehicle 1 and further improving the reliability of the closed-cabin retraction of the emergency mechanized bridge.

[0058] In addition, a laser indicator is further included in the retraction system. The laser indicator is fixedly arranged on the front cantilever 101. When the front cantilever 101 swings to a preset angle, the laser emitted by the laser indicator can hit a preset marked position on the bridge span 2, which is used to assist the driver in judging whether the front cantilever 101 swings to the preset angle, thereby improving the reliability of the retraction system.

[0059] The display device 3 includes a display screen 301 and control buttons 302. Through the control buttons 302, it is possible to switch between the images captured by the centering camera, the roller monitoring camera, and the outrigger monitoring camera, and instructions such as the lower swing or upper swing of the front cantilever 101 can be sent to the PLC through the control buttons.

[0060] Embodiment 2:

[0061] Based on Embodiment 1, this embodiment provides an emergency mechanized bridge retraction method, which includes the following steps:

[0062] Step 1: The driver drives the bridge erection vehicle 1 towards the emergency mechanized bridge;

[0063] Step 2: When one end of the emergency mechanized bridge coincides with the horizontal alignment reference line, the driver issues a control command to the control device through the control device to control the lower swing and upper swing of the erection mechanism, so as to retract the bridge span 1 to the bridge erection vehicle 1.

[0064] Specifically, the above Step 2 includes:

[0065] Step 201: When one end of the bridge span 2 coincides with the first horizontal alignment reference line, the driver issues a control command to the control device through the control device to control the lower swing of the erection mechanism by a preset angle (it will automatically stop after swinging to the calibrated position), so that the rollers are aligned with the slideway;

[0066] Step 202: The driver continues to drive the bridge erection vehicle 1 towards the bridge span 2, so that the rollers roll into the slideway;

[0067] Step 203: When one end of the bridge span 2 coincides with the second horizontal alignment reference line, the driver issues a control command to the control device through the control device to control the upper swing of the erection mechanism by a preset angle (it will automatically stop after swinging to the calibrated position), so that one end of the bridge span 2 is lifted;

[0068] Step 204: The driver continues to drive the bridge erection vehicle 1 towards the bridge span 2;

[0069] Step 205: When one end of the bridge span 2 coincides with the third horizontal alignment reference line, the bridge span 2 is completely lifted, and the driver issues a control command to the control device through the control device to control the outriggers to swing down and support on the ground.

[0070] In addition, the driver also selects reference objects on both the left and right sides of the longitudinal central axis of the bridge span 2, aligns the rollers with the slideways left and right, so that the rollers can more conveniently extend into the slideways of the bridge span 2, and realizes the centering and retraction of the bridge span 2 (aligned in both the left-right direction and the horizontal direction).

[0071] In summary, the above are only the preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An emergency mechanized bridge withdrawal system, characterized in that, It includes a bridging vehicle, a centering camera, a display device, and a control device; An erection mechanism capable of swinging up and down relative to the chassis of the bridging vehicle is provided in the direct front of the bridging vehicle, which is used to retract the bridge span on the ground to the chassis of the bridging vehicle, and the bridging vehicle is also provided with outriggers for support; The centering camera is fixedly installed in the direct front of the bridging vehicle. The centering camera is provided with a horizontal alignment reference line and is signal-connected to the display device. It can capture the image of the bridge span in real time and transmit the image of the bridge span to the display device in real time; The display device is fixedly installed in the cab of the bridging vehicle and can display the relative position between the image of the bridge span and the horizontal alignment reference line in real time, which is used to assist the driver in judging the distance between the bridge span and the bridging vehicle; The control device is signal-connected to the control device in the cab and the erection mechanism. With the assistance of the display device, the driver issues a control command to the control device through the control device. After receiving the control command, the control device can control the erection mechanism and the outriggers to swing by a preset angle; There are three horizontal alignment reference lines, namely the first horizontal alignment reference line, the second horizontal alignment reference line, and the third horizontal alignment reference line that are parallel to each other; When the bridging vehicle approaches the bridge span, one end of the bridge span close to the bridging vehicle coincides with the first horizontal alignment reference line, the second horizontal alignment reference line, and the third horizontal alignment reference line in sequence; The erection mechanism is a front cantilever; One end of the front cantilever is hinged to the head of the bridging vehicle, and the other end extends forward along the longitudinal central axis of the bridging vehicle towards the front of the head of the bridging vehicle. The front cantilever is provided with rollers, and the rollers can roll in the slideway of the bridge span; It also includes a roller monitoring camera signal-connected to the display device; The roller monitoring camera is fixedly installed on the front cantilever, can capture the image of the rollers in real time, and can transmit the image of the rollers to the display device in real time, which is used to assist the driver in docking the rollers with the slideway of the bridge span.

2. The emergency mechanized bridge withdrawal system according to claim 1, wherein, It also includes a outrigger monitoring camera signal-connected to the display device; The outrigger monitoring camera is fixedly installed on the bridging vehicle, can capture the image of the outriggers in real time, and can transmit the image of the outriggers to the display device in real time, which is used to assist the driver in judging the position of the outriggers relative to the bridge span.

3. The emergency mechanized bridge withdrawal system according to claim 1, characterized in that, It also includes a laser indicator; The laser indicator is fixedly arranged on the front cantilever. When the front cantilever swings to a preset angle, the laser emitted by the laser indicator can hit a preset marked position on the bridge span, which is used to assist the driver in judging whether the front cantilever swings to the preset angle.

4. The emergency mechanized bridge retraction system according to claim 2, characterized in that, The outrigger is a support shovel.

5. A method for withdrawing an emergency mechanized bridge, characterized in that, Adopting the emergency mechanized bridge retraction system according to any one of claims 1-4, it includes the following steps: Step 1: Control the bridging vehicle to approach the emergency mechanized bridge; Step 2: When one end of the emergency mechanized bridge coincides with the horizontal alignment reference line, send a control command to the control device through the control device to control the lower swing and upper swing of the erection mechanism, so as to retract the bridge span to the bridge erection vehicle.

6. The emergency mechanized bridge retraction method according to claim 5, wherein Step 2 specifically includes: Step 201: When one end of the bridge span coincides with the first horizontal alignment reference line, send a control command to the control device through the control device to control the lower swing of the erection mechanism by a preset angle, so that the rollers are aligned with the slideway; Step 202: The driver continues to drive the bridge erection vehicle closer to the bridge span, so that the rollers roll into the slideway; Step 203: When one end of the bridge span coincides with the second horizontal alignment reference line, the driver sends a control command to the control device through the control device to control the upper swing of the erection mechanism by a preset angle, so that one end of the bridge span is lifted; Step 204: The driver continues to drive the bridge erection vehicle closer to the bridge span; Step 205: When one end of the bridge span coincides with the third horizontal alignment reference line and the bridge span is completely lifted, the driver sends a control command to the control device through the control device to control the outrigger to swing down and support on the ground.

7. The emergency mechanized bridge retraction method according to claim 5 or 6, characterized in that, The driver also selects reference objects on the left and right sides of the longitudinal central axis of the bridge span to align the rollers with the slideway left and right.

Images