A monitoring device for determining the position of stirrups of a box girder by using BIM technology and a use method thereof

Abstract

The application relates to the technical field of bridge engineering, in particular to a monitoring device for measuring the position of a box girder stirrup by using BIM technology and a use method thereof, which comprises a translation support, a main track, a monitoring unit and a monitoring driving unit. The monitoring unit comprises a first connecting steel plate, a connecting rod and monitoring rods hinged to the periphery of the first connecting steel plate, and the first connecting steel plate is in sliding connection with the main track. One end of the monitoring rod is hinged to the first connecting steel plate, and the other end is in contact with the stirrup in the box girder. One end of the connecting rod is in sliding connection with the main track, and the other end is hinged to the monitoring rod. The monitoring rod comprises four monitoring rods arranged in four directions of the first connecting steel plate respectively, and the two monitoring rods symmetrically slide and hingedly rotate synchronously. The main driving block, the first driving block and the second driving block are arranged, so that the steps of measuring the stirrup position by the X-direction measuring position group and the Y-direction measuring position group can be carried out synchronously, and the monitoring efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, specifically to a monitoring device and method for determining the position of stirrups in a box girder using BIM technology. Background Technology

[0002] Prefabricated box girders are commonly used in bridge construction due to their high load-bearing capacity, high rigidity, and light weight. Currently, the fabrication of box girders mainly relies on intelligent steel reinforcement construction schemes combined with subsequent concrete pouring. The steel reinforcement cages in the box girders are assembled in the factory using intelligent machinery and then transported by vehicles to the concrete pouring molds.

[0003] Although box girders are manufactured in factories to ensure high precision, during actual on-site construction, issues such as insufficient installation accuracy by workers and deviations in the hoisting of construction equipment can easily lead to deviations in the position of the stirrups in the box girder. This can easily cause insufficient shear strength of the box girder and cracks on both sides of the web of the box girder. Summary of the Invention

[0004] To address the problem in existing technologies where deviations in the position of stirrups in box girders affect the quality of box girders, this invention provides a monitoring device and method for determining the position of stirrups in box girders using BIM technology.

[0005] This invention is achieved through the following technical solution:

[0006] A monitoring device for determining the position of stirrups in a box girder using BIM technology includes a translational support, a main track, a monitoring unit, and a monitoring drive unit. The main track is located inside the reinforcement cage to be measured and is slidably installed on the translational support. The monitoring unit is slidably mounted on the main track. The monitoring unit includes a first connecting steel plate, a connecting rod, and a monitoring rod hinged around the first connecting steel plate. The first connecting steel plate is slidably connected to the main track. One end of the monitoring rod is hinged to the first connecting steel plate, and the other end contacts the stirrups in the box girder. One end of the connecting rod is slidably connected to the main track, and the other end is hinged to the monitoring rod.

[0007] The first connecting steel plate is provided with a main drive block to drive the first connecting steel plate to slide on the moving active track;

[0008] The monitoring rods include four rods, which are respectively set in four directions of the first connecting steel plate, arranged symmetrically in pairs, and the two symmetrical monitoring rods slide and rotate synchronously; it also includes a first drive block and a second drive block set on the main track to drive the monitoring rods to move and rotate;

[0009] The main drive block, the first drive block, the second drive block, and the connecting rod are all controlled by an external control terminal.

[0010] Preferably, the monitoring rod includes a force measuring rod and a position measuring rod. One end of the force measuring rod is hinged to the first connecting steel plate, and the other end is fixedly connected to the position measuring rod. The length axis of the position measuring rod is perpendicular to the length axis of the force measuring rod. The connecting rod is hinged to the side wall of the force measuring rod.

[0011] Preferably, the first drive block is connected to the connecting rods corresponding to two of the symmetrical monitoring rods, and the second drive block is connected to the connecting rods corresponding to the remaining two symmetrical monitoring rods; the connecting rods are electric telescopic rods, and the connecting rods are controlled by an external control terminal.

[0012] Preferably, a stress plate is provided on the measuring rod, and the output end of the stress plate is connected to the input end of an external control terminal.

[0013] Preferably, the force measuring rod includes a first load-bearing rod, a self-resetting pressure-type damping component, and a second load-bearing rod connected in sequence. The end of the first load-bearing rod away from the self-resetting pressure-type damping component is connected to the measuring rod, and the end of the second load-bearing rod away from the self-resetting pressure-type damping component is connected to the first connecting steel plate. The connecting rod is connected to the outer wall of the self-resetting pressure-type damping component.

[0014] Preferably, a displacement sensor is provided on the self-resetting pressure damping component, and the output end of the displacement sensor is connected to the input end of an external control terminal.

[0015] Preferably, a Y-shaped branch rod is provided between the first load-bearing rod and the measuring rod, and the two branches of the Y-shaped branch rod are symmetrically arranged along the load-bearing rod, with the measuring rod fixed between the two branches.

[0016] A monitoring method for determining the position of stirrups in box girders using BIM technology, the specific steps of which are as follows:

[0017] S1. Assemble the translation support, connect the main track to the translation support, slide the monitoring drive unit onto the main track, and finally connect the monitoring unit to the monitoring drive unit.

[0018] S2, drive the main drive block to slide on the main rail and perform the first monitoring. In the first monitoring, monitor the four edges of each stirrup separately. Specifically, drive the main drive block to the monitoring point, then drive the first and second drive blocks, and use the monitoring rod to obtain the stirrup G to be monitored. 1i Collision point P 1ij And mark them in the BIM model; where i represents the i-th stirrup and j represents the j-th edge;

[0019] S3, adjust the position of the translational support and main track inside the stirrups, drive the main drive block to slide on the main track and perform a second monitoring. In the second monitoring, monitor the four edges of each stirrup separately. Specifically, drive the main drive block to the monitoring point, then drive the first and second drive blocks, and use the monitoring rod to obtain the G values ​​of all stirrups during the second monitoring process. 2i Collision point P 2ij And mark it in the BIM model;

[0020] S4. Based on the collision points obtained in the first and second monitoring, collect them uniformly and connect them with corresponding line segments in BIM. Then, extend each line segment to obtain the plane of any stirrup. Then connect all the stirrup planes to obtain the stirrup monitoring model.

[0021] S5. By comparing the stirrup monitoring model with the stirrup theoretical model established according to the drawings, the deviation of the corresponding position of the stirrup can be obtained.

[0022] Preferably, in S2 or S3, the collision point can be marked when the midpoint of the side rod in the corresponding monitoring rod collides with the stirrup.

[0023] Preferably, in S2 or S3, the position of the collision point relative to the main drive block 6 is calculated based on the instantaneous state and size of the force measuring rod 9 in the corresponding monitoring rod and the angle α between the force measuring rod 9 and the main track 5.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] This invention discloses a monitoring device for determining the position of stirrups in box girders using BIM technology. By setting up a main drive block, a first drive block, and a second drive block, the steps of determining the position of stirrups 2 in the X-direction and Y-direction measurement groups can be carried out simultaneously, thus accelerating the monitoring time. Furthermore, the device has low installation accuracy requirements, facilitating on-site installation and operation by workers. The monitoring device of this application has a relatively simple structure, low installation accuracy requirements, and relies on a remote receiving end for practical use, making it easy to operate.

[0026] The present invention discloses a monitoring device for determining the position of stirrups in box girders using BIM technology. The method involves taking two measurements and then connecting and extending the lines in the BIM three-dimensional space to determine the final stirrup state, thus ensuring the accuracy of the monitoring. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the actual use of the device for determining the position of stirrups in a box girder using BIM technology according to the present invention;

[0028] Figure 2 for Figure 1 Top view;

[0029] Figure 3 This is a schematic diagram of the device for determining the position of stirrups in a box girder using BIM technology according to the present invention.

[0030] Figure 4 This is another structural schematic diagram of the device for determining the position of stirrups in a box girder using BIM technology according to the present invention;

[0031] Figure 5 This is a side view of a device for determining the position of stirrups in a box girder using BIM technology, according to the present invention.

[0032] Figure 6 This is a flowchart of a device for determining the position of stirrups in a box girder using BIM technology, according to the present invention.

[0033] Figure 7 This is a flowchart illustrating the monitoring process of any single stirrup in a device for determining the position of stirrups in a box girder using BIM technology, as described in this invention.

[0034] Figure 8 This is a flowchart illustrating the monitoring process of arbitrary edges in a device for determining the position of stirrups in a box girder using BIM technology, as described in this invention.

[0035] Figure 9 This is a schematic diagram of the device for determining the position of stirrups in a box girder using BIM technology, according to the present invention, during the first monitoring of a certain stirrup;

[0036] Figure 10 This is a schematic diagram of a device for determining the position of stirrups in a box girder using BIM technology, according to the present invention, performing a second monitoring of a certain stirrup;

[0037] Figure 11 This is a schematic diagram illustrating the formation of the stirrup surface during the establishment of the stirrup monitoring model in this invention.

[0038] In the diagram, 1. Main reinforcement of precast box girder; 2. Stirrups; 31. Vertical bar; 32. Horizontal bar; 4. Fixed base; 5. Main track; 6. Main drive block; 61. First electric control drive block; 62. First connecting steel plate; 7. Y-shaped branch bar; 8. First drive block; 82. Second drive block; 83. Connecting rod; 9. Force measuring rod; 91. First load-bearing rod; 92. Self-resetting pressure type damping component; 93. Second load-bearing rod; 10. Position measuring rod. Detailed Implementation

[0039] The present invention will be further described in detail below with reference to specific embodiments. These descriptions are for explanation purposes only and are not intended to limit the scope of the invention.

[0040] This invention discloses a monitoring device for determining the position of stirrups 2 in a box girder using BIM technology, with reference to... Figure 1The system includes a translational support, a main track 5, a monitoring unit, and a monitoring drive unit. The main track 5 is located inside the steel cage to be measured and is slidably mounted on the translational support. The steel cage to be measured consists of the main reinforcement 1 and stirrups 2 of a precast box girder, and its cross-section can be rectangular, trapezoidal, or polygonal. The translational support includes a horizontal bar 32 and a vertical bar 31. During installation, the two ends of the main track 5 extending out of the steel cage are connected to the horizontal bar 32. The horizontal bar 32 is an electrically controlled slide rail, and a slider is installed inside the electrically controlled slide rail. The slider is rotatably connected to the circular main track 5 (such as a bearing connection), allowing the main track 5 to translate and rotate within the steel cage by means of the horizontal bar 32 and the vertical bar 31. The two ends of the horizontal bar 32 are connected to the vertical bar 31 by bolts or welding. The vertical bar 31 is an electrically controlled telescopic rod, and its lower end is fixed by a fixed base 4. Meanwhile, a level bubble is installed on the crossbar 32 to facilitate leveling. During installation, the top surface of the crossbar 32 remains horizontal in its initial position. The main track 5 has a circular cross-section, and a 360° scale line is provided circumferentially at the end where the main track 5 connects to the crossbar 32 to facilitate the detection of the rotation angle of the main track 5. Multiple vertical pointers are provided along the length of the crossbar 32. When taking a reading, the vertical pointers coincide with the 360° scale line to accurately obtain the rotation angle. Alternatively, an angle sensor can be installed on the main track 5 to obtain the rotation angle.

[0041] The monitoring unit is slidably mounted on the main track 5. The monitoring unit includes a first connecting steel plate 62, a connecting rod 83, and a monitoring rod hinged around the first connecting steel plate 62. The first connecting steel plate 62 is slidably connected to the main track 5. The first connecting steel plate 62 and the first electrically controlled drive block 61 form a main drive block 6 to drive the first connecting steel plate 62 to slide on the moving main track 5. The first connecting steel plate 62 is mounted on the first electrically controlled drive block 61 for connecting the monitoring rod.

[0042] One end of the monitoring rod is hinged to the first connecting steel plate 62, and the other end contacts the stirrup 2 in the box girder. There are four monitoring rods, which are respectively set in the four directions of the first connecting steel plate 62 and arranged symmetrically in pairs.

[0043] The monitoring rod includes a force measuring rod 9 and a position measuring rod 10. One end of the force measuring rod 9 is hinged to the first connecting steel plate 62, and the other end is fixedly connected to the position measuring rod 10. The length axis of the position measuring rod 10 is perpendicular to the length axis of the force measuring rod 9. A stress plate is provided on the position measuring rod 10. The output end of the stress plate is connected to the input end of the external control terminal. When the stirrup 2 comes into contact with the position measuring rod 10, the remote receiving end can monitor the contact position of the stirrup 2 on the position measuring rod 10. At the same time, when the stirrup 2 comes into contact in the middle of the position measuring rod 10, the remote receiving end can quickly and accurately receive the electrical signal.

[0044] One end of the connecting rod 83 is slidably connected to the main track 5 via the second driving block 82 or the first driving block 8, and the other end is hinged to the side wall of the force measuring rod 9. In this embodiment, the force measuring rod 9 includes a first supporting rod 91, a self-resetting pressure type damping element 92, and a second supporting rod 93 connected in sequence. The end of the first supporting rod 91 away from the self-resetting pressure type damping element 92 is connected to the positioning rod 10, and the end of the second supporting rod 93 away from the self-resetting pressure type damping element 92 is hinged to the first connecting steel plate 62; the connecting rod 83 is hinged to the outer wall of the self-resetting pressure type damping element 92. A displacement sensor is installed on the self-resetting pressure type damping element 92, and the output end of the displacement sensor is connected to the input end of an external control terminal. The self-resetting pressure type damping element 92 is a damper with its energy-consuming part built into a sleeve, such as a hydraulic damper, an SMA wire energy-consuming damper, or a sleeve damper with a built-in spring. A Y-shaped branch rod 7 is provided between the first load-bearing rod 91 and the measuring rod 10. The two branches of the Y-shaped branch rod 7 are symmetrically arranged along the load-bearing rod 9, and the measuring rod 10 is fixed between the two branches.

[0045] It also includes a first drive block 8 and a second drive block 82 mounted on the main track 5 to drive the monitoring rod to move and rotate. In this embodiment, the first drive block 8 and the second drive block 82 are located on the same side of the main drive block 6. The main drive block 6, the first drive block 8, the second drive block 82, and the connecting rod 83 are all controlled by an external control terminal. In this embodiment, the main drive block 6, the first drive block 8, and the second drive block 82 are all electrically controlled by cables to ensure that the main drive block 6, the first drive block 8, and the second drive block 82 can slide in a specific direction and lock in position on the circular main track 5.

[0046] The first drive block 8 is connected to the connecting rod 83 corresponding to two symmetrical monitoring rods, and the second drive block 82 is connected to the connecting rod 83 corresponding to the remaining two symmetrical monitoring rods. The connecting rod 83 is an electrically operated telescopic rod, controlled by an external control terminal. All electrically controlled telescopic rods can be controlled independently, and all electrically controlled telescopic rods are equipped with displacement sensors, which are connected to a remote receiver via cables. This is to facilitate the remote receiver in determining the working status of the electrically controlled telescopic rods at any time. Both the first drive block 8 and the second drive block 82 are equipped with connecting plates that are hinged to the connecting rod 83.

[0047] During engineering use, when either the Y-axis or X-axis measuring group first monitors and determines the collision point with the stirrup 2, the corresponding connected first drive block 8 or second drive block 82 and main drive block 6 can adjust their respective positions through the remote receiving end. The positions of the other group of first drive blocks 8 and second drive blocks 82 should also be adjusted synchronously to avoid the force measuring rod 9 colliding with the stirrup 2 or the main drive block 6 at too large a distance, causing some components to exceed the measuring range.

[0048] This invention also discloses a monitoring method for determining the position of stirrups in box girders using BIM technology, the specific steps of which are as follows:

[0049] S1. Assemble the translation support, connect the main track 5 to the translation support, slide the monitoring drive unit on the main track 5, and finally connect the monitoring unit to the monitoring drive unit.

[0050] S2, drive the main drive block 6 to slide on the main track 5 and perform the first monitoring. In the first monitoring, monitor the four edges of each stirrup 2 separately. Specifically, drive the main drive block 6 to the monitoring point, then drive the first drive block 8 and the second drive block 82, and use the monitoring rod to obtain the stirrup G to be monitored. 1i Collision point P 1ij The collision point is marked in the BIM model (the collision point P is marked when the midpoint of the measuring rod 10 in the corresponding monitoring rod collides with the stirrup 2); where i represents the i-th stirrup and j represents the j-th edge. At the same time, the position of the collision point relative to the main drive block 6 is calculated based on the instantaneous state and size of the corresponding force measuring rod 9 and the angle α between the force measuring rod 9 and the circular main track 5.

[0051] Four monitoring rods are designated as the first X-axis monitoring rod, the second X-axis monitoring rod, the first Y-axis monitoring rod, and the second Y-axis monitoring rod. The first X-axis monitoring rod, the second X-axis monitoring rod, and the first drive block 8 form the X-axis positioning group, while the first Y-axis monitoring rod, the second Y-axis monitoring rod, and the second drive block 82 form the Y-axis positioning group. Initially, the X-axis detection group is parallel to the horizontal plane of the ground, and the Y-axis positioning group is perpendicular to the horizontal plane of the ground. During installation, the entire monitoring unit is located within a steel cage. To avoid collisions with the steel reinforcement, the X-axis and Y-axis monitoring groups will rotate appropriately, resulting in an angular difference from their initial positions. The angle γ can be read from the scale lines. X γ Y The value can be used to calculate the real-time angle β of the plane where the X-axis positioning group is located relative to the vertical plane perpendicular to the earth plane where the main track axis 5 is located.

[0052] In this invention, the X-direction positioning group and the Y-direction positioning group determine the spatial position of the stirrup 2 by contacting and colliding with it using the same principle. (See reference...) Figure 7 Taking the first stirrup G in the first monitoring 11 Let's take space monitoring as an example to illustrate:

[0053] S21, see reference Figure 8 , 9 The first drive block 8 and the second drive block 82 are driven, and the first X-axis monitoring rod is used to obtain the first stirrup G. 11 Collision point P 11j And mark it in the BIM model;

[0054] Specifically as follows:

[0055] (1) Drive the first drive block 8 and the second drive block 82 to ensure that the first drive block 8 and the second drive block 82 are in an overall forward state, and avoid the force measuring rod 9 from colliding with the stirrup 2. When one of the measuring rods 10 in the X-direction monitoring group first makes contact with the stirrup G 11 When a collision occurs, let's assume that point is the collision point P. 111 ;

[0056] (2) Determine the collision point P 111 Check if it coincides with the midpoint of the positioning rod 10. If it does not coincide, readjust the positions of the first drive block 8 and the second drive block 82, and retest to ensure the collision point P. 11j It encountered the midpoint of the measuring rod 10;

[0057] (3) When the collision point P 11j When the collision occurs at the midpoint of the measuring rod 10, the collision point P is calculated by the remote receiving end based on the instantaneous state and dimensions of the force measuring rod 9 and the α value. 111 The collision point P can be obtained relative to the position of the main drive block 6, i.e., by using the α value, the real-time angle β of the plane where the X-axis positioning group is located relative to the vertical plane perpendicular to the earth plane where the axis of the main track 5 is located, and the distance from the midpoint of the positioning rod 10 to the main drive block 6. 111 The position relative to the main drive block 6. Let α be the angle between the length direction of each force measuring rod 9 and the axis of the main track 5. The value of α is related to the distance m1 from the first drive block 8 to the main drive block 6, the distance m2 from the second drive block 82 to the main drive block 6, and the sum of the centerline heights of the force measuring rod 9 and the Y-shaped branch rod 7. Before the monitoring device of this application is used, the calculation formulas of α(m1,l) and α(m2,l) need to be obtained through experimental methods and theoretical calculations. l is the sum of the centerline heights of the force measuring rod 9 and the Y-shaped branch rod 7.

[0058] (4) The remote receiver records the position of the main drive block 6 relative to the main track 5 at this time, and records it as the fixed point Q. 1ij This allows the creation of collision points P in BIM software. 111 The relative positions of the main drive block 6 and the main track 5.

[0059] S22, drive the first drive block 8 and the second drive block 82 until another measuring rod 10 in the X-direction monitoring group collides with the stirrup 2, and use the second X-direction monitoring rod to obtain the collision point P. 112 Mark it in BIM software;

[0060] S23, drive the first drive block 8 and the second drive block 82, and use the first Y-axis monitoring rod to obtain the collision point P. 113 And mark it in the BIM model;

[0061] S24, drive the first drive block 8 and the second drive block 82, and use the second Y-axis monitoring rod to obtain the collision point P. 114 And mark it in the BIM model;

[0062] Then, following the same sequence of S21 to S24, the positions of all stirrups 2 were measured. The measurement results were then unified in the same BIM to obtain the positions of all stirrups under the first monitoring state.

[0063] S3, refer to Figure 10 Adjust the position of the translational support and main track 5 inside the stirrups, drive the main drive block 6 to slide on the main track 5 and perform a second monitoring. In the second monitoring, monitor the four edges of each stirrup 2 separately. Specifically, drive the main drive block 6 to the monitoring point, then drive the first drive block 8 and the second drive block 82, and use the monitoring rod to obtain all stirrup G during the second monitoring process. 2i Collision point P 2ij The position of the main drive block 6 relative to the main track 5 during the second monitoring process is recorded as the determination point Q. 2ij ;

[0064] S4, see reference Figure 11 Based on the collision points obtained from the first and second monitoring, the corresponding collision points are uniformly collected and connected and extended in BIM (i.e., the two collision points of the four edges of each stirrup are connected) to obtain the stirrup monitoring model.

[0065] S5. By comparing the monitoring model of stirrup 2 with the theoretical model of stirrup established according to the drawings, the deviation of the corresponding position of stirrup 2 can be obtained.

[0066] During use, safety limits are set for the maximum deviation of the force measuring rod 9 from the main track 5 in stages to prevent the force measuring rod 9 from directly colliding with the stirrup 2 and affecting the monitoring accuracy.

[0067] The present invention discloses a monitoring device for determining the position of stirrups 2 in a box girder using BIM technology. The device employs two measurements, followed by connecting and extending lines in the BIM three-dimensional space to determine the final state of the stirrups 2, thus ensuring the accuracy of the monitoring.

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the technical solution of the present invention in any way. Those skilled in the art should understand that, without departing from the spirit and principles of the present invention, the technical solution can be modified and replaced in several simple ways, and these modifications and replacements are all within the scope of protection covered by the claims.

Claims

1. A monitoring device for determining the position of stirrups in a box girder using BIM technology, characterized in that, The system includes a translational support, a main track (5), a monitoring unit, and a monitoring drive unit. The main track (5) is located inside the steel cage to be tested and is slidably installed on the translational support. The monitoring unit is slidably set on the main track (5). The monitoring unit includes a first connecting steel plate (62), a connecting rod (83), and a monitoring rod hinged around the first connecting steel plate (62). The first connecting steel plate (62) is slidably connected to the main track (5). One end of the monitoring rod is hinged to the first connecting steel plate (62), and the other end is in contact with the stirrups (2) in the box girder. One end of the connecting rod (83) is slidably connected to the main track (5), and the other end is hinged to the monitoring rod. The first connecting steel plate (62) is provided with a main driving block (6) to drive the first connecting steel plate (62) to slide on the moving active track; The monitoring rods include four rods, which are respectively set in four directions of the first connecting steel plate (62), arranged symmetrically in pairs, and the two symmetrical monitoring rods slide and rotate synchronously; it also includes a first drive block (8) and a second drive block (82) set on the main track (5) to drive the monitoring rods to move and rotate; The main drive block (6), the first drive block (8), the second drive block (82) and the connecting rod (83) are all controlled by an external control terminal; The monitoring rod includes a force measuring rod (9) and a position measuring rod (10). One end of the force measuring rod (9) is hinged to the first connecting steel plate (62), and the other end is fixedly connected to the position measuring rod (10). The length axis of the position measuring rod (10) is perpendicular to the length axis of the force measuring rod (9). The connecting rod (83) is hinged to the side wall of the force measuring rod (9). The first drive block (8) is connected to the connecting rod (83) corresponding to two of the symmetrical monitoring rods, and the second drive block (82) is connected to the connecting rod (83) corresponding to the remaining two symmetrical monitoring rods; the connecting rod (83) is an electric telescopic rod, and the connecting rod (83) is controlled by an external control terminal; A stress plate is provided on the measuring rod (10), and the output end of the stress plate is connected to the input end of the external control terminal; The force measuring rod (9) includes a first load-bearing rod (91), a self-resetting pressure-type damping element (92), and a second load-bearing rod (93) connected in sequence. The end of the first load-bearing rod (91) away from the self-resetting pressure-type damping element (92) is connected to the measuring rod (10), and the end of the second load-bearing rod (93) away from the self-resetting pressure-type damping element (92) is connected to the first connecting steel plate (62). The connecting rod (83) is connected to the outer wall of the self-resetting pressure-type damping element (92). A displacement sensor is installed on the self-resetting pressure damping element (92), and the output end of the displacement sensor is connected to the input end of the external control terminal. A Y-shaped branch rod is provided between the first load-bearing rod (91) and the measuring rod (10). The two branches of the Y-shaped branch rod are symmetrically arranged along the load-bearing rod (9), and the measuring rod (10) is fixed between the two branches.

2. A monitoring method for determining the position of stirrups in a box girder using BIM technology as described in claim 1, characterized in that, The specific steps are as follows: S1, Assemble the translational support, connect the main track (5) to the translational support, slide the monitoring drive unit on the main track (5), and finally connect the monitoring unit to the monitoring drive unit; S2, drive the main drive block (6) to slide on the main track (5) and perform the first monitoring. In the first monitoring, monitor the four edges of each stirrup separately. Specifically, drive the main drive block (6) to the monitoring point, and then drive the first drive block (8) and the second drive block (82) to obtain the stirrup to be monitored using the monitoring rod. G 1i collision point P 1ij And mark it in the BIM model; among which, i Indicates the first i One stirrup, j Indicates the first j Edges; S3, adjust the position of the translational support and the main track (5) inside the stirrups, drive the main drive block (6) to slide on the main track (5) and perform a second monitoring. ， In the second monitoring, the four edges of each stirrup were monitored separately. Specifically, the main drive block (6) was driven to the monitoring point, and then the first drive block (8) and the second drive block (82) were driven. The monitoring rod was used to obtain the data of all stirrups during the second monitoring process. G 2i collision point P 1ij And mark it in the BIM model; S4. Based on the collision points obtained in the first and second monitoring, collect them uniformly and connect them with line segments in the BIM. Then, extend each line segment to obtain the plane of any stirrup. Then connect all the stirrup planes to obtain the stirrup monitoring model. S5. By comparing the stirrup monitoring model with the stirrup theoretical model established according to the drawings, the deviation of the corresponding position of the stirrup (2) can be obtained.

3. The monitoring method according to claim 2, characterized in that, In S2 or S3, the collision point can be marked when the midpoint of the side rod in the corresponding monitoring rod collides with the stirrup.

4. The monitoring method according to claim 2, characterized in that, In S2 or S3, based on the instantaneous state and size of the force measuring rod (9) in the corresponding monitoring rod, and the angle between the force measuring rod (9) and the circular main track (5), α The value is calculated to determine the position of the collision point relative to the main drive block (6).

Images