A position deviation monitoring device for synchronous jacking of bridges

Abstract

The present invention discloses a position offset monitoring device for synchronous bridge jacking in the technical field of synchronous bridge jacking, which aims to solve the problem that the traditional monitoring method of bridge jacking in the prior art is not convenient for obtaining offset data in multiple directions. It includes a mounting platform and a top surface positioning plate, the mounting platform is positioned on the top surface of the cap beam and the top surface positioning plate is positioned on the bottom surface of the main beam, a first grating scale is rotatably mounted on the mounting platform, a second grating scale is mounted on the reading head of the first grating scale, an angle sensor is provided on the mounting platform, a connecting assembly is mounted on the top surface positioning plate, and the connecting assembly is fixedly connected to the reading head of the second grating scale. The present invention is used to simultaneously monitor multiple offset data during the synchronous bridge jacking process, and provide a more effective data basis for the jacking work of the main beam, thereby facilitating more precise control of the hydraulic jack system and ensuring the reliability of the main beam jacking process.

Description

Technical Field

[0001] The invention relates to a position deviation monitoring device for synchronous bridge jacking, belonging to the technical field of bridge jacking position deviation monitoring. Background Art

[0002] Replacing the bearings or changing the design of the bridge requires synchronous jacking of the bridge. By installing multiple hydraulic jacks on the cap beam to synchronously jack up different areas of the main beam, the main beam and the connector are separated, making it easier to replace and maintain the bearings or make additional design changes. However, during the synchronous jacking process, position offsets may occur. This offset may affect the safety, accuracy and structural stability of the project, or cause local uneven force to cause the main beam to tilt, affecting the hydraulic control accuracy of the jacking process. Therefore, it is very necessary to monitor the position offset during the jacking process.

[0003] At present, the traditional position offset monitoring method uses displacement sensors for detection, such as laser displacement meters or photoelectric displacement meters for jacking monitoring. However, this method can usually only detect the distance position changes between objects. It is impossible to directly obtain a reference benchmark for the horizontal offset and offset angle of the relative position. In other words, it is impossible to effectively obtain data such as the offset on the X-axis and Y-axis and the corresponding deflection angle. For the automatic control system, there is still a lack of relevant effective control data reference, making it difficult to improve the accuracy of the automatic control hydraulic system. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a position offset monitoring device for synchronous jacking of bridges, which is used to simultaneously monitor multiple offset data during the synchronous jacking of bridges, providing more effective data basis for the jacking work of the main beam, thereby facilitating more precise control of the hydraulic jack system and ensuring the reliability of the main beam jacking process.

[0005] To achieve the above object, the present invention is implemented by adopting the following technical solutions:

[0006] The present invention provides a position offset monitoring device for synchronous jacking of a bridge, comprising a mounting platform and a top surface positioning plate, wherein the mounting platform is positioned on the top surface of the cap beam and the top surface positioning plate is positioned on the bottom surface of the main beam, a first grating scale is rotatably mounted on the mounting platform so that the scale body of the first grating scale can rotate within a horizontal plane, a second grating scale is mounted on the reading head of the first grating scale, the scale body direction of the second grating scale is perpendicular to the rotation plane of the first grating scale, an angle sensor for detecting the deflection angle of the first grating scale is provided on the mounting platform, a connecting assembly is mounted on the top surface positioning plate, and the connecting assembly is fixedly connected to the reading head of the second grating scale.

[0007] Specifically, the mounting platform includes a mounting plate and a plurality of rollers arranged below the mounting plate. A plurality of anchor bolts are also installed on the mounting platform, and the bottom surface of the roller is located within the height adjustment range of the bottom support surface of the anchor bolt.

[0008] Specifically, it also includes an orientation device, which includes a positioning frame with a "T"-shaped structure and a connecting rod arranged at the end of the positioning frame. A plane bearing is provided on the mounting platform, and the scale body of the first grating scale is fixedly set on the upper end surface of the plane bearing. A positioning block is provided on the upper end surface of the plane bearing, and a slot is provided on the positioning block. The connecting rod can be inserted into the slot.

[0009] Specifically, the connecting assembly includes a first connecting bar fixedly arranged below the top positioning plate and a second connecting bar fixedly arranged on the second grating scale reading head. The first connecting bar and the second connecting bar are connected through a connecting rod. Threaded grooves are provided at both ends of the connecting rod. Nuts are assembled on the threaded grooves for connecting and fixing the connecting rod to the first connecting bar and the second connecting bar respectively.

[0010] Specifically, it also includes a support plate, and the support plate and the top positioning plate are both equipped with a rotating seat, and the two rotating seats are respectively rotatably provided with rotating rods, and the ends of the two rotating rods are hingedly connected by a connecting sleeve, and two piston plates are slidingly provided inside the connecting sleeve along the axial direction of the sleeve, and the two piston plates are connected by a first spring. The two rotating rods and one side of the piston plate are both equipped with column heads, and the column heads on the two rotating rods are hingedly provided with driving rods, and the other ends of the two driving rods are respectively hingedly connected to the column heads on the two adjacent piston plates, and the two rotating rods maintain the parallelism of the rotating rod axes through a limiting device.

[0011] Specifically, the limiting device includes limiting sleeves respectively mounted on two rotating rods, at least one of the limiting sleeves is fixedly connected to the rotating rod, and two connecting joints are provided on the two limiting sleeves. The distance between the two connecting joints of the two groups of the limiting sleeves is equal, and the two groups of connecting joints of the two limiting sleeves are hingedly connected through two limiting rods, and the two limiting rods are located on parallel lines of the parallelogram where the outer connecting lines of the four connecting joints are located.

[0012] Specifically, the limiting rod includes a sleeve and a sliding rod slidably arranged in the sleeve, and each of the sleeve and the sliding rod is hingedly arranged on a corresponding connecting joint.

[0013] Specifically, a positioning hole is provided on the sleeve, a plurality of connecting holes are provided on the slide bar, and a pin capable of selectively plugging into one of the connecting holes is provided on the positioning hole.

[0014] Specifically, two second springs are respectively provided on both sides of the interior of the connecting sleeve for abutting against the piston plate, and the elastic moduli of the two second springs are equal and smaller than the elastic modulus of the first spring.

[0015] Specifically, an elastic layer is provided between the top surface positioning plate and the corresponding rotating seat, and between the support plate and the corresponding rotating seat, and an inclination sensor is provided on the top surface positioning plate.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention provides a mounting platform and a top surface positioning plate that are respectively fixed relative to the cap beam and the main beam, and uses a combination of two grating scales and an angle sensor to monitor the position offset between the top surface positioning plate and the mounting platform. The inclination degree of the bridge body in the X-axis and Y-axis directions is judged by the angle offset and the actual offset amplitude of the grating scale. At the same time, the combination of the grating scales can also measure the actual height position change of the jacking, and obtain the actual offset position of the relative fixed point in the spatial coordinate system. Compared with the traditional straight-line measurement of distance changes, these data obtain more effective parameters that can provide instructions. After the equipment is positioned, there is no need for manual participation in the adjustment of related measurement structures, and it is also more convenient to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 1 is a schematic diagram of the overall structure of a detection device provided by an embodiment of the present invention;

[0019] Figure 2 This invention Figure 1 An enlarged view of the structure at point A of a detection device provided in an embodiment;

[0020] Figure 3 This is another perspective structural diagram of a detection device provided by an embodiment of the present invention;

[0021] Figure 4 is a front view of a detection device provided by an embodiment of the present invention;

[0022] Figure 5 This invention Figure 4 An enlarged view of the structure at position B of a detection device provided in an embodiment;

[0023] Figure 6 is a side view of a detection device provided by an embodiment of the present invention;

[0024] Figure 7 This invention Figure 6 A cross-sectional view in the CC direction of a detection device provided in an embodiment;

[0025] Figure 8 This invention Figure 6A DD-direction cross-sectional view of a detection device provided in an embodiment;

[0026] Figure 9 This is a schematic diagram of the principle of measuring the axial offset data of the coordinate system according to the present invention;

[0027] Figure markings: 1. Mounting platform; 101. Mounting plate; 102. Roller; 103. Anchor bolt; 2. Plane bearing; 3. First grating scale; 4. Second grating scale; 5. Angle sensor; 6. Top surface positioning plate; 7. Connecting assembly; 701. First connecting bar; 702. Second connecting bar; 703. Connecting rod; 8. Orienting device; 9. Positioning block; 10. Inclination sensor; 11. Support plate; 12. Rotating seat; 13. Rotating rod; 15. Limiting rod; 1501. Sleeve; 1502. Sliding rod; 16. Connecting sleeve; 17. Piston plate; 18. First spring; 19. Drive rod; 20. Second spring; 21. Limiting sleeve. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0030] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0031] A position offset monitoring device for synchronous bridge jacking provided by an embodiment of the present invention is used to simultaneously monitor data of multiple offsets during the synchronous bridge jacking process, providing a more effective data basis for the jacking work of the main beam, thereby facilitating more precise control of the hydraulic jack system and ensuring the reliability of the main beam jacking process. In order to enable the monitoring device to obtain the spatial position offset data of the main beam, the monitoring device is provided here, including a mounting platform 1 and a top surface positioning plate 6, wherein the mounting platform 1 is positioned on the top surface of the cap beam, and the top surface positioning plate 6 is positioned on the bottom surface of the main beam (the cap beam and the main beam are usually connected by a support, not in direct contact, with a certain gap). ), the positioning and fixing method of the mounting platform 1 and the top surface positioning plate 6 is not limited here. The mounting platform 1 can be placed directly on the cap beam, and the top surface positioning plate 6 can be fixed below the main beam by bolts and other structures. By fixing the mounting platform 1 and the top surface positioning plate 6, when the main beam is lifted, the spatial position offset of the main beam can be detected by monitoring the relative position offset of the top surface positioning plate 6 and the mounting platform 1. In order to obtain more accurate actual offsets of the main beam in the X-axis, Y-axis and Z-axis directions, a first grating ruler 3 is rotatably installed on the mounting platform 1 so that the scale body of the first grating ruler 3 can rotate within the horizontal plane. Please refer to Figure 1 As shown, the design bearing is assembled in the middle of the mounting platform 1, and the support is rotated on the bearing. The first grating scale 3 is fixed on the support, so that the first grating scale 3 can rotate freely in the plane direction according to the rotation of the support. Figure 1 As shown, a second grating ruler 4 is installed on the reading head of the first grating ruler 3, so that the scale body direction (extension direction) of the second grating ruler 4 is perpendicular to the rotation surface of the first grating ruler 3. In order to realize the measurement of position deviation, a connecting component 7 is installed on the top surface positioning plate 6 (the specific connection method is not further limited here), and the connecting component 7 is fixedly connected to the reading head of the second grating ruler 4. Through the above structural design, when the main beam of the bridge is lifted, the top surface positioning plate 6 will move with the change of the main beam position. During the movement, the connecting component 7 drives the reading head of the second grating ruler 4 to move within the spatial range, and the reading head of the second grating ruler 4 When the number head moves, the second grating ruler 4 and the reading head of the first grating ruler 3 are simultaneously driven to shift relative to the first grating ruler 3, thereby obtaining the plane position offset on the first grating ruler 3, and the reading head of the second grating ruler 4 can detect the position offset in the Z-axis direction. In order to effectively obtain the data of the plane position offset, an angle sensor 5 for detecting the deflection angle of the first grating ruler 3 is provided on the mounting table 1. The angle sensor 5 can be coaxially connected to the transmission shaft of the support to obtain the plane deflection angle, thereby calculating the actual offset in the X-axis and Y-axis directions according to the plane offset read out by the first grating ruler 3, as shown in FIG. Figure 9As shown, the square indicates the position of the reading head of the first grating ruler 3. The reading of the initial position can be set parallel to the X-axis (that is, the initial position of the first grating ruler 3 is parallel to the X-axis, which is more convenient for calculation), which is recorded as the zero position. When deflection occurs, the reading of the first grating ruler 3 becomes △L, and the angle sensor 5 then measures the deflection angle α, which can be used to obtain the actual offset of the positioning point on the X-axis and Y-axis during the jacking process, respectively, as △Lcosα and △Lsinα. Through the above configuration, the offset of the spatial position change of the monitoring point can be realized. The operation is simple. After fixing once, there is no need to manually change the detection point, which helps to achieve multi-directional monitoring during the main beam jacking process at one time.

[0032] An embodiment of the present invention provides a position offset monitoring device for synchronous jacking of a bridge. Considering that after the top surface positioning plate 6 is fixed, when the reading head of the second grating ruler 4 is connected through the connecting assembly 7, the initial position of the mounting platform 1 is not convenient to match. For this reason, it is preferably provided that the mounting platform 1 can be movable to facilitate the connection of the connection point. Specifically, in order to simultaneously ensure the position positioning and movement of the mounting platform 1, the mounting platform 1 includes a mounting plate 101 and a plurality of rollers 102 arranged below the mounting plate 101. Since the mounting platform 1 itself is prone to unstable position offset after the rollers 102 are installed, a plurality of anchor bolts 103 can also be installed on the mounting platform 1. Figure 4 As shown, the bottom surface of the roller 102 is located within the height adjustment range of the bottom support surface of the anchor bolt 103, so that a stable support foot can be provided when the mounting plate 101 needs to be positioned. Through this structural design, the mounting table 1 can also allow the first grating scale 3 to be in the initial X-axis position during the movement.

[0033] The embodiment of the present invention provides a position deviation monitoring device for synchronous jacking of a bridge. In order to facilitate the definition of the direction of the X-axis during the monitoring process, the device is provided with a direction device 8, such as Figure 1 As shown, an orientation device 8 is provided including a positioning frame with a "T"-shaped structure and a connecting rod arranged at the end of the positioning frame. At the same time, a plane bearing 2 is provided on the mounting table 1, so that the scale body part of the first grating scale 3 is fixedly provided on the upper end face of the plane bearing 2, so that the upper end face of the plane bearing 2 and the first grating scale 3 can only undergo synchronous deflection movements. At the same time, a positioning block 9 is provided on the upper end face of the plane bearing 2, and a slot is provided on the positioning block 9, so that the connecting rod of the orientation device 8 can be just inserted into the slot. Through this design, after the orientation device 8 is inserted, the side wings of the "T"-shaped positioning frame can determine whether it is in a position parallel to the preset Y-axis, and the position of the mounting table 1 can be further adjusted and calibrated through the judgment structure of the orientation device 8.

[0034] An embodiment of the present invention provides a position deviation monitoring device for synchronous jacking of a bridge, specifically providing a connection method of a connecting component 7. Specifically, the connecting component 7 includes a first connecting bar 701 fixedly arranged below the top surface positioning plate 6 and a second connecting bar 702 fixedly arranged on the reading head of the second grating ruler 4, such as Figure 1 As shown, a first connecting bar 701 and a second connecting bar 702 are connected through a connecting rod 703, and threaded grooves are provided at both ends of the connecting rod 703. Nuts are installed on the threaded grooves for connecting and fixing the connecting rod 703 to the first connecting bar 701 and the second connecting bar 702 respectively. Here, the connecting rod 703 adopts an assembly design with nuts, which can adapt to the height difference between different cap beam positions and the main beam for assembly, which helps to improve the connection range and facilitate manual assembly operations.

[0035] The embodiment of the present invention provides a position deviation monitoring device for synchronous jacking of a bridge. Considering that if the top surface positioning plate 6 is fixed by bolts, it will undoubtedly greatly increase the manual construction workload, and it is not convenient to perform manual drilling and fixing operations for the narrow space under the main beam. Once the holes are drilled, only a specific local position can be fixed, which is not convenient for flexible position adjustment and is relatively cumbersome to disassemble. Therefore, in order to simplify the use of the device, the device is provided herein and further includes a support plate 11, such as Figure 4 As shown, the support plate 11 and the top positioning plate 6 are both equipped with a rotating seat 12, and the two rotating seats 12 are respectively provided with a rotating rod 13, and as shown in FIG. Figure 1 and Figure 3 As shown, the ends of the two rotating rods 13 are hingedly connected by connecting sleeves 16, as shown in FIG. Figure 1 As shown, the two ends of the connecting sleeve 16 are provided with hinge points, and the interior is hollow. The two hinge points on both sides are respectively hinged (rotatably connected) to the ends of the two rotating rods 13. The interior of the connecting sleeve 16 is provided with two piston plates 17 that slide along the axial direction of the sleeve. The two piston plates 17 are connected by a first spring 18. Figure 1As shown, column heads are installed on one side of the two rotating rods 13 and the piston plate 17 (all column heads are located on the same side), and driving rods 19 are hingedly provided on the column heads on the two rotating rods 13. The other ends of the two driving rods 19 are hingedly connected to the column heads on the two adjacent piston plates 17. Finally, the two rotating rods 13 are set to keep the axes of the rotating rods 13 parallel through limit devices. Through the design of this structure, the driving rod 19 will control the angle difference between the connecting sleeve 16 and the adjacent rotating rods 13. Due to the elastic action of the first spring 18, the initial angle between the connecting sleeve 16 and the rotating rod 13 is large, which is manifested as a large relative position deviation between the support plate 11 and the top surface positioning plate 6. During installation, it is manually overcome the first spring 18. The elastic force of a spring 18 compresses the height difference between the top surface positioning plate 6 and the support plate 11, and after it is placed at the monitoring point, the compression is released, allowing the first spring 18 to stretch freely, thereby realizing the abutment between the top surface positioning plate 6 and the bottom of the main beam. This installation method is more flexible and easier to disassemble, which can effectively reduce the workload of manual installation and help to facilitate the switching or increase of monitoring points. In order to ensure the stability of the support, a limit device is used to maintain the parallelism between the two rotating rods 13, wherein the specific limiting method of the limit device is not limited here. The preferred embodiment can be referred to as shown below. The design of the limit device is used to prevent the instability of the angular deflection of the drive rod 19 due to the unstable position of the piston plate 17. When the top surface positioning plate 6 is positioned in this way, the rotating seat 12 can provide adaptive deflection for the rotating rod 13. According to different design sizes, the support plate 11 and the top surface positioning plate 6 can have different adjustment ranges, which can achieve stable support while simplifying the installation work.

[0036] The embodiment of the present invention provides a position deviation monitoring device for synchronous jacking of a bridge, which specifically provides a setting method of a limit device to ensure the stable expansion and contraction of the support plate 11 and the top surface positioning plate 6. Specifically, the limit device provided here includes a limit sleeve 21 respectively sleeved on the two rotating rods 13, at least one of the limit sleeves 21 is fixedly connected to the rotating rod 13, such as Figure 3As shown, two connecting joints are provided on each of the two limiting sleeves 21, and the distances between the two connecting joints of the two groups of limiting sleeves 21 are equal. The two groups of connecting joints of the two limiting sleeves 21 are hingedly connected by two limiting rods 15. The two limiting rods 15 are located on the parallel lines of the parallelogram where the outer connecting lines of the four connecting joints are located, that is, the effective connection lengths of the connecting limiting sleeves 21 of the two limiting rods 15 are equal, and can be hingedly connected with the connecting joints so that the four connecting joints are in the state of being at the nodes of the parallelogram. When the four connecting joints are in the parallelogram position, the limiting sleeves 21 are naturally in a parallel state, so that the rotating rod 13 is in a connected state. When the telescopic change occurs, one of the limiting sleeves 21 is fixed, and the other limiting sleeve 21 slides relative to the rotating rod 13 where it is located, thereby ensuring that the two rotating rods 13 are in a parallel state during the dynamic process. The rotating rod 13 that is always in a parallel state can effectively ensure stable pressure on the monitoring point and avoid the occurrence of rollover and other situations caused by structural instability.

[0037] An embodiment of the present invention provides a position offset monitoring device for synchronous jacking of a bridge. Considering that the height of the position gap between the main beam and the cap beam is different, the design length of the rotating rod 13 may be limited during installation. Then the rotating rod 13 cannot provide sufficient length for the limiting sleeve 21 to slide significantly to adapt to the adaptive telescopic change. At this time, the design of the limiting rod 15 is changed, so that the limiting rod 15 includes a sleeve 1501 and a slide rod 1502 slidably set in the sleeve 1501, and each sleeve 1501 and the slide rod 1502 are respectively hinged and set on the corresponding connecting joint, such as Figure 3 and Figure 8 As shown, a positioning hole is provided on the sleeve 1501, and a plurality of connecting holes are provided on the slide rod 1502. A pin is provided on the positioning hole, which can be selectively plugged into one of the connecting holes. By changing the position design of the pin, the effective connection length range of the limit rod 15 is changed, thereby changing the adaptive sliding range of the limit sleeve 21, which helps to adapt it to different height position differences and slide and retract within the adaptive range, thereby avoiding the rotating rod 13 structure being too short, resulting in the effective sliding distance being insufficient to meet the usage requirements of various scenarios.

[0038] The embodiment of the present invention provides a position deviation monitoring device for synchronous jacking of a bridge, which specifically provides an additional structure for stabilizing the piston plate 17 in the middle area. Specifically, two second springs 20 are provided on both sides of the interior of the connecting sleeve 16 to abut the piston plate 17, that is, to abut on the other side plane abutted by the first spring 18, such as Figure 5As shown, the first spring 18 and the two piston plates 17 can be regarded as a whole, and the two second springs 20 are used to drive this whole to the middle position inside the connecting sleeve 16, so that the corresponding driving rod 19 is in a more stable angle change range. In order to avoid the design of the second spring 20 affecting the stretching effect of the first spring 18 on the driving rod 19, it is necessary to design the elastic modulus of the two second springs 20 to be equal and smaller than the elastic modulus of the first spring 18, so that when the device is in a natural state, the support plate 11 and the top positioning plate 6 can be normally in an extended state.

[0039] An embodiment of the present invention provides a position offset monitoring device for synchronous jacking of a bridge. Taking into account that the main beam of the bridge will also undergo a certain angular offset during the jacking process, in order to facilitate the acquisition of the actual amount of tilt angle offset, an elastic layer is provided between the top surface positioning plate 6 and the corresponding rotating seat 12, and between the support plate 11 and the corresponding rotating seat 12, so that the part of the device that actually contacts the bridge body is connected to the device through the elastic layer. When the main beam of the bridge body deviates in position, the support plate 11 and the top surface positioning plate 6 here will also adaptively match the inclination. At this time, by providing an inclination sensor 10 on the top surface positioning plate 6, the change between the current inclination and the horizontal plane angle can be conveniently and quickly detected. In some preferred embodiments, multiple inclination sensors 10 can be set on the same top surface positioning plate 6, which helps to obtain more accurate deflection data in multiple directions.

[0040] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A position deviation monitoring device for synchronous jacking of a bridge, characterized in that: The invention comprises a mounting platform (1) and a top surface positioning plate (6), wherein the mounting platform (1) is positioned on the top surface of the cap beam and the top surface positioning plate (6) is positioned on the bottom surface of the main beam, a first grating ruler (3) is rotatably mounted on the mounting platform (1) so that the scale body of the first grating ruler (3) can rotate within a horizontal plane, a second grating ruler (4) is mounted on the reading head of the first grating ruler (3), the scale body direction of the second grating ruler (4) is perpendicular to the rotation plane of the first grating ruler (3), an angle sensor (5) for detecting the deflection angle of the first grating ruler (3) is provided on the mounting platform (1), a connecting component (7) is mounted on the top surface positioning plate (6), and the connecting component (7) is fixedly connected to the reading head of the second grating ruler (4); The mounting platform (1) comprises a mounting plate (101) and a plurality of rollers (102) arranged below the mounting plate (101); a plurality of anchor bolts (103) are further mounted on the mounting platform (1); the bottom surface of the rollers (102) is located within a height adjustment range of the bottom support surface of the anchor bolts (103); It also includes an orientation device (8), the orientation device (8) includes a positioning frame with a "T"-shaped structure and a plug-in rod arranged at the end of the positioning frame, the mounting platform (1) is provided with a plane bearing (2), the scale body portion of the first grating scale (3) is fixedly arranged on the upper end surface of the plane bearing (2), the upper end surface of the plane bearing (2) is provided with a positioning block (9), the positioning block (9) is provided with a slot, and the plug-in rod can be inserted into the slot; It also includes a support plate (11), wherein the support plate (11) and the top surface positioning plate (6) are both provided with a rotating seat (12), and a rotating rod (13) is rotatably provided on the two rotating seats (12), and the ends of the two rotating rods (13) are hingedly connected through a connecting sleeve (16), and two piston plates (17) are provided inside the connecting sleeve (16) so as to slide along the axial direction of the sleeve, and the two piston plates (17) are abutted and connected by a first spring (18), and a column head is provided on one side of the two rotating rods (13) and the piston plate (17), and a driving rod (19) is hingedly provided on the column heads of the two rotating rods (13), and the other ends of the two driving rods (19) are respectively hingedly connected to the column heads on the two adjacent piston plates (17), and the two rotating rods (13) keep the axis of the rotating rod (13) parallel through a limiting device; Two second springs (20) are respectively provided on both sides of the interior of the connecting sleeve (16) for contacting the piston plate (17), and the elastic moduli of the two second springs (20) are equal and smaller than the elastic modulus of the first spring (18); Elastic layers are provided between the top surface positioning plate (6) and the corresponding rotating seat (12), and between the support plate (11) and the corresponding rotating seat (12). An inclination sensor (10) is provided on the top surface positioning plate (6).

2. A position deviation monitoring device for synchronous bridge lifting according to claim 1, characterized in that: The connecting assembly (7) includes a first connecting bar (701) fixedly arranged below the top surface positioning plate (6) and a second connecting bar (702) fixedly arranged on the reading head of the second grating ruler (4), the first connecting bar (701) and the second connecting bar (702) are connected through a connecting rod (703), and thread grooves are provided at both ends of the connecting rod (703), and nuts are assembled on the thread grooves for connecting and fixing the connecting rod (703) to the first connecting bar (701) and the second connecting bar (702) respectively.

3. The position deviation monitoring device for synchronous bridge lifting according to claim 2 is characterized in that: The limiting device comprises limiting sleeves (21) respectively sleeved on two rotating rods (13), at least one of the limiting sleeves (21) is fixedly connected to the rotating rod (13), two connecting joints are provided on the two limiting sleeves (21), the distances between the two connecting joints of the two groups of limiting sleeves (21) are equal, the two groups of connecting joints of the two limiting sleeves (21) are hingedly connected through two limiting rods (15), and the two limiting rods (15) are located on parallel lines of the parallelogram where the connecting lines outside the four connecting joints are located.

4. A position deviation monitoring device for synchronous bridge lifting according to claim 3, characterized in that: The limiting rod (15) comprises a sleeve (1501) and a sliding rod (1502) slidably arranged in the sleeve (1501), and each sleeve (1501) and sliding rod (1502) are respectively hingedly arranged on a corresponding connecting joint.

5. The position deviation monitoring device for synchronous bridge lifting according to claim 4 is characterized in that: The sleeve (1501) is provided with a positioning hole, the slide rod (1502) is provided with a plurality of connection holes, and the positioning hole is provided with a pin that can be selectively plugged into one of the connection holes.

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