System for automatically monitoring incremental launching construction of small-radius curve steel box girder bridge

Abstract

The utility model relates to the field of automatic monitoring of pushing of a small-radius curve steel box girder bridge, and discloses a system for automatic monitoring of pushing construction of a small-radius curve steel box girder bridge, which comprises an inertia monitoring mechanism, the inertia monitoring mechanism comprises a sliding rail, the sliding rail is arranged on the longitudinal central axis of a girder, a sliding block is slidably connected to the sliding rail, and the sliding block is arranged on the sliding rail. And an inertial sensor is arranged on the sliding block. Therefore, the quality and the safety of the bridge in the pushing process are improved.

Description

Technical Field

[0001] This utility model relates to the field of automated monitoring of the launching of small-radius curved steel box girder bridges, specifically to a system for automated monitoring of the launching construction of small-radius curved steel box girder bridges. Background Technology

[0002] During the jacking process of a bridge, since the temporary supports are in a fixed position while the beam is constantly moving, the cantilever lengths before and after the beam are constantly changing, and the vertical displacement is also in a dynamic process. Therefore, it is particularly important to monitor the alignment of the bridge during the jacking process. Furthermore, for curved bridges, it is necessary to control the axis within a reasonable range during the jacking process in order to jack it to the designated position. At this time, axis monitoring and correction are also very important.

[0003] In existing technologies, reflective stickers are typically installed on the main beam, and optical equipment is used to measure the stickers to detect the beam's position and other information, thus enabling timely correction. However, this method suffers from low accuracy, is highly susceptible to external interference, and has a low data update rate. The position of each point needs to be measured individually, and data between points is missing. It cannot reflect changes in the bridge's alignment and axis from multiple dimensions and perspectives, and it cannot provide better feedback to the site for timely correction, making it difficult to improve the quality and safety of the bridge during the jacking process. Utility Model Content

[0004] The present invention aims to provide an automated system for monitoring the jacking construction of small-radius curved steel box girder bridges, thereby improving the quality and safety of the bridge during the jacking process.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a system for automatically monitoring the jacking construction of a small-radius curved steel box girder bridge, comprising an inertial monitoring mechanism, the inertial monitoring mechanism comprising a slide rail, the slide rail being set on the longitudinal centerline of the main beam, a slider being slidably connected on the slide rail, and an inertial sensor being provided on the slider.

[0006] The beneficial effects of this plan are:

[0007] 1. This scheme is based on the jacking construction of bridges. The track is made of materials with good ductility, such as steel, so that the track can deform with the main beam.

[0008] 2. In the initial state, the slider slides to the end of the track. After the jacking device completes one jacking, when the top and bottom beams remain stable, the inertial sensor records its own movement trajectory L1 along with the main beam. Then, the slider slides back and forth along the slide rail, recording the slide rail alignment M1 at this time. The recorded data is compared with the design data to correct the direction of movement. The alignment M1 is compared with the initial slide rail alignment to adjust the synchronization rate between the jacking devices and reduce the deformation of the slide rail and the main beam.

[0009] 3. Compared to existing technologies that measure various points with reflective stickers, this solution directly uses inertial sensors to obtain the position, attitude angle, heading, and speed of the main beam's central axis. This allows for multi-dimensional and multi-faceted reflection of changes in the bridge's alignment and axis, providing better feedback to the site and enabling timely correction of the bridge's deviations, thereby improving the quality and safety of the bridge during the jacking process.

[0010] 4. Regarding the spatial domain of the beam's shape, the inertial sensor can continuously acquire the beam's shape data due to the use of a slider + rail arrangement.

[0011] Furthermore, the slide rail is equipped with a rack, the slider is equipped with a drive motor, and the output shaft of the drive motor is equipped with a gear, which meshes with the rack.

[0012] Furthermore, it also includes several jacking devices, each equipped with a pressure sensor. The pressure sensor is used to detect the lifting force of the output shaft of the jacking device. When the pressure of all pressure sensors remains stable, the drive motor drives the slider to slide back and forth on the slide rail.

[0013] Furthermore, the slide rail is detachably connected to the longitudinal centerline on the lower surface of the main beam.

[0014] Furthermore, it also includes an optical monitoring mechanism, which consists of a total station and several reflective pads. The reflective pads are equidistantly arranged on the side of the main beam, and the total station is used to measure the spatial position of the reflective pads.

[0015] Furthermore, the spacing between reflective stickers is 1 / 8 of the main beam length.

[0016] Furthermore, it also includes a stress monitoring mechanism, which consists of several strain gauges that are equally spaced along the inner and outer edges of the main beam.

[0017] Furthermore, the strain gauge spacing is 1 / 4 of the main beam length.

[0018] Furthermore, the inertial sensor is a strapdown inertial navigation system.

[0019] This solution also has the following effects:

[0020] 1. To ensure the main beam remains stable while the slider slides on the slide rail, the drive motor must drive the slider to slide back and forth on the slide rail once only after the pressure readings from all pressure sensors have stabilized. The specific time for the pressure to stabilize can be set to 30 seconds to 1 minute. That is, if the pressure readings from all pressure sensors remain stable within 30 seconds to 1 minute, the drive motor can be started automatically. Alternatively, the drive motor can be set to manual start, and can only be started manually after the pressure readings from all pressure sensors have stabilized within 30 seconds to 1 minute.

[0021] 2. A Leica total station is used. The Leica total station automatically locates the reflective pads to collect readings, thereby detecting the position of the main beam as an auxiliary means.

[0022] 3. The strain gauge is a vibrating wire strain gauge. The stress in the main beam is monitored by the vibrating wire strain gauge so that the internal stress can be adjusted and reduced in a timely manner.

[0023] 4. The inertial sensor model is MN400, which is a strapdown inertial navigation system. This system establishes a navigation coordinate system based on the output of the gyroscope, calculates the velocity and position of the transport vehicle in the navigation coordinate system based on the output of the accelerometer, and can also display the linear attitude of the bridge beam during the bridge jacking process, so as to adjust the jacking direction in a timely manner. Attached Figure Description

[0024] Figure 1 This is a bottom view diagram of the installation process in an embodiment;

[0025] Figure 2 This is a schematic diagram of the correction method used in an embodiment.

[0026] Figure 3 A cross-sectional view of the slide rail and slider in the embodiment. Detailed Implementation

[0027] The following detailed description illustrates the specific implementation method:

[0028] The reference numerals in the accompanying drawings include: main beam 1, slide rail 21, slider 22, inertial sensor type 23, rack 24, drive motor 25, drive gear 26, upper rotating wheel 27, side rotating wheel 28, total station 3, strain gauge 4, and jacking device 5.

[0029] Example

[0030] The implementation examples are basically as follows Figures 1-3 As shown: A system for automatically monitoring the jacking construction of a small-radius curved steel box girder bridge is applicable to the jacking construction of small-radius curved steel box girder bridges. The main construction process is as follows: the main girder 1 is jacked to the design position using a walking jacking device 5. This embodiment includes an inertial monitoring mechanism, an optical monitoring mechanism, a stress monitoring mechanism, the jacking device 5, and a data processing mechanism.

[0031] The inertial monitoring mechanism includes slide rail 21, such as Figure 1 As shown, the slide rail 21 is set on the longitudinal centerline of the lower surface of the main beam 1, as follows: Figure 3 As shown, a slider 22 is slidably connected to the slide rail 21. An inertial sensor, model MN400, is mounted on the slider 22. This is a strapdown inertial navigation system. The system establishes a navigation coordinate system based on the gyroscope output and calculates the velocity and position of the transport vehicle within the navigation coordinate system based on the accelerometer output. It can also display the linear attitude of the bridge beam during the jacking process. Specifically, the slide rail 21 is a cold-bent I-beam. A rack 24 is welded to the surface of the slide rail 21. An installation cavity is formed inside the slider 22. A strip-shaped hole is provided on the upper surface of the slider 22, extending through the front and rear directions of the slider 22. The strip-shaped hole connects the installation cavity and the external space of the slider 22. The width of the strip-shaped hole is greater than the width of the web of the slide rail 21 but less than the width of the lower flange of the slide rail 21. The lower flange of the slide rail 21 is accommodated within the installation cavity. An inertial sensor and a drive motor 25 are bolted together within the installation cavity. The output shaft of the drive motor 25... A drive gear 26 is connected to the left end key, and the upper side of the drive gear 26 meshes with the rack 24. Two upper rotating wheels 27 are rotatably connected to the upper side wall of the mounting cavity, and a side rotating wheel 28 is rotatably connected to the left side wall and the right side wall of the mounting cavity, respectively. The upper rotating wheel 27 is used to roll on the upper surface of the lower flange of the slide rail 21, and the side rotating wheel 28 is used to roll on the side of the lower flange of the slide rail 21. The installation method of the upper rotating wheel 27 and the side rotating wheel 28 is that they are passed through a rotating shaft and rotatably connected to the rotating shaft. This is the existing wheel installation method, which will not be described in detail.

[0032] The optical monitoring system includes a total station (3 units) and several reflective pads, such as... Figure 1 As shown, several reflective stickers are equidistantly pasted on the inner side of the main beam 1 (the side closest to the total station 3). The spacing between the reflective stickers is 1 / 8 of the length of the main beam 1. The total station 3 is a Leica total station 3, which is used to automatically locate the reflective stickers, collect readings, and measure the spatial position of the reflective stickers.

[0033] like Figure 1 As shown, the stress monitoring mechanism includes several strain gauges 4, which are welded at equal intervals along the inner and outer edges of the main beam 1. The spacing between the strain gauges 4 is 1 / 4 of the length of the main beam 1, and the strain gauges 4 are vibrating wire strain gauges 4.

[0034] The jacking device 5 is a walking jacking device 5. Each jacking device 5 is equipped with a pressure sensor. The pressure sensor is used to detect the lifting force of the output shaft of the jacking device 5. The installation method of the pressure sensor is existing technology and will not be described in detail.

[0035] The data processing unit includes a computer and a transmission module. The transmission module electrically connects the computer to the inertial sensor, drive motor 25, total station 3, strain gauge 4 and pressure sensor for transmitting signals. The transmission module consists of a DTU wireless transceiver unit, a 220V to 12V transformer power supply module and a hub.

[0036] Data collected by the inertial sensor is wirelessly transmitted to the computer via a transmission module;

[0037] The reading signals from strain gauge 4 and pressure sensor are wirelessly transmitted to the computer via the transmission module;

[0038] The data collected by the total station 3 is wirelessly transmitted to the computer via the transmission module;

[0039] When the pressure from all pressure sensors remains stable for 30-60 seconds, the computer issues a command to drive motor 25 to drive slider 22 to slide back and forth on slide rail 21.

[0040] The usage method of the inertial monitoring mechanism is as follows:

[0041] In the initial state, slider 22 slides to the end of the track. After the jacking device 5 completes one jacking, when the jacking and lowering beams remain stable, the inertial sensor records its own movement trajectory L1 along with the main beam 1. Then, slider 22 slides back and forth along slide rail 21, recording the current line shape M1 of slide rail 21. The recorded data is compared with the design data to correct the direction of movement. The line shape M1 is compared with the initial line shape of slide rail 21, and the synchronization rate between the jacking devices 5 is adjusted to reduce the deformation of slide rail 21 and main beam 1. The schematic diagram of M1 and the corrected main beam 1 is shown below. Figure 2 As shown.

[0042] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A system for automated monitoring of incremental launching construction of a small-radius curve steel box girder bridge, characterized in that: The inertial monitoring mechanism comprises a slide rail arranged on the longitudinal center axis of the main beam, a sliding block connected to the slide rail, and an inertial sensor arranged on the sliding block.

2. The system for automated monitoring of incremental launching construction of a small-radius curve steel box girder bridge according to claim 1, characterized in that: The slide rail is provided with a rack, and the sliding block is provided with a driving motor, and the output shaft of the driving motor is provided with a gear, and the gear is engaged with the rack.

3. The system for automated monitoring of incremental launching construction of a small-radius curve steel box girder bridge according to claim 2, characterized in that: The pushing device is provided with a pressure sensor for detecting the jacking force of the output shaft of the pushing device, and when the pressure of all the pressure sensors is stable and unchanged, the driving motor drives the sliding block to slide on the slide rail.

4. The system for automated monitoring of incremental launching construction of a small-radius curve steel box girder bridge according to claim 1, characterized in that: The slide rail is detachably connected to the longitudinal center axis of the lower surface of the main beam.

5. The system for automated monitoring of incremental launching construction of a small-radius curve steel box girder bridge according to claim 1, characterized in that: The optical monitoring mechanism comprises a total station and a plurality of reflective stickers, and the reflective stickers are equidistantly arranged on the side surface of the main beam.

6. The system for automated monitoring of incremental launching construction of a small-radius curve steel box girder bridge according to claim 5, characterized in that: The distance between the reflective stickers is 1 / 8 of the length of the main beam.

7. The system for automated monitoring of incremental launching construction of a small-radius curve steel box girder bridge according to claim 1, characterized in that: The stress monitoring mechanism comprises a plurality of strain gauges equidistantly arranged on the inner and outer edges of the main beam.

8. The system for automated monitoring of incremental launching construction of a small-radius curve steel box girder bridge according to claim 7, characterized in that: The distance between the strain gauges is 1 / 4 of the length of the main beam.

9. The system for automated monitoring of incremental launching construction of a small-radius curve steel box girder bridge according to claim 1, characterized in that: The inertial sensor is a strapdown inertial navigation system.

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