A precision monitoring and correcting instrument for a bridge machine T-beam

Abstract

The application provides a bridge girder precision monitoring and correcting instrument for a bridge girder erection machine, which comprises a laser emitting device and a receiving device, the middle part of a laser emitting lamp plate is provided with a transverse standard lamp area, two side auxiliary lamp areas and a middle auxiliary lamp area along the transverse direction, the laser receiving device comprises a base and four groups of strip-shaped laser receivers, a controller one of the laser emitting device is used for controlling the start and stop of the transverse standard lamp area, the middle auxiliary lamp area and the longitudinal standard lamp area, and is also used for controlling the two side auxiliary lamp areas to be gradually extinguished from outside to inside according to a certain time sequence, a controller two of the laser receiving device is used for receiving the signals of the four groups of laser receivers respectively, and feeding back the signals to the hoisting system of the bridge girder erection machine, so as to provide a correcting guide for the moving direction of the crown block of the hoisting system. The scheme effectively solves the positioning difficulty and the poor precision problem of the bridge girder erection machine in the T-shaped girder transportation and installation, improves the installation precision, efficiency and safety, and is especially beneficial to large engineering projects.

Description

Technical Field

[0001] This invention belongs to the field of T-beam assembly and positioning technology for bridge erecting machines, and specifically relates to a precision monitoring and correction instrument for T-beams of bridge erecting machines. Background Technology

[0002] T-beams are common bridge structural elements, typically consisting of a horizontal top beam and a vertical column, resembling the Latin letter "T". Their structure makes them widely used in various construction and engineering projects. The primary function of T-beams is to bear vertical loads and transfer them to the foundation or supporting structure. This makes them crucial in building frame structures, bridges, and mechanical equipment supports. Bridge erecting machines (also known as bridge jacks or bridge lifting machines) are specialized equipment used to install the superstructure of bridges. They typically utilize enormous lifting capacity to precisely lift T-beams and other components onto piers, thus completing the bridge construction. T-beams are also widely used in the construction of highways and elevated roads. Bridge erecting machines can be used to place T-beams onto supports, forming the supporting structure of elevated roads. This application allows highways to cross rivers, railways, and other obstacles. In the construction of subway, light rail, and railway systems, T-beams and bridge erecting machines are equally important. T-beams support rails and trains, while bridge erecting machines are used to install these beams on underground or elevated tracks.

[0003] Construction projects involving T-beams are subject to building codes and standards that typically require structural components to meet specific precision requirements. Monitoring and ensuring the accuracy of the T-beams ensures project compliance with these regulations. Significant errors in beam dimensions or location can lead to structural instability or uneven load distribution, thereby affecting the structure's safety and stability. Summary of the Invention

[0004] To address the difficulties and poor accuracy in positioning T-beams during bridge erection machine installation, this solution provides a laser precision monitoring and adjustment mechanism to achieve high precision and safety in the installation position.

[0005] The solution to the technical problem of this invention is as follows: A bridge erecting machine T-beam accuracy monitoring and correction instrument is used, comprising a laser emitting device fixed in the middle of the pier base plate and a laser receiving device fixed in the center of the T-beam end. The laser emitting device includes a base, an adjustment mechanism, and a laser emitting light plate. The laser emitting light plate has a horizontal standard light area, two auxiliary light areas on both sides, and a central auxiliary light area distributed horizontally in the middle. The two auxiliary light areas are located outside the two strip-shaped horizontal standard light areas, and the central auxiliary light area is located inside the two strip-shaped horizontal standard light areas. Multiple laser emitting light strips are fixed vertically within the horizontal standard light areas, and multiple laser emitting light strips are also fixed vertically within the auxiliary light areas and the central auxiliary light area. Two strip-shaped longitudinal standard light areas are distributed on the front and rear sides of the laser emitting light plate, respectively. Each longitudinal standard light area contains... Multiple laser emitting light strips are fixed horizontally. The laser receiving device includes a base and four sets of strip-shaped laser receivers. Two sets of laser receivers are fixed horizontally at the front and rear ends of the base, and the other two sets are fixed vertically at the left and right ends of the base. Two horizontal standard light zones correspond to the positions of the two sets of horizontal laser receivers, and two vertical standard light zones correspond to the positions of the two sets of vertical laser receivers. Controller 1 of the laser emitting device is used to control the start and stop of the horizontal standard light zones, the central auxiliary light zone, and the vertical standard light zones. It is also used to control the auxiliary light zones on both sides to gradually turn off from the outside to the inside according to a certain time sequence. Controller 2 of the laser receiving device is used to receive the signals from the four sets of laser receivers and feed back each set of signals to the crane's lifting system, providing correction guidance for the movement direction of the crane.

[0006] Preferably, a light-blocking cover is fitted on the outside of the laser receiver device, leaving only the four strip-shaped laser receiver positions as light-transmitting areas.

[0007] Preferably, a light-blocking strip is affixed to the outer side of the light-transmitting area, and a strip-shaped light-transmitting area is located in the center of the light-blocking strip.

[0008] Preferably, the adjustment mechanism is located between the base and the laser emitting lamp plate, and is used to adjust the laser emitting lamp plate, including rotation adjustment, horizontal adjustment and vertical adjustment.

[0009] Preferably, a rotating mechanism is installed on the base. The rotating mechanism includes a housing and an internal worm gear assembly. A turntable is fixed to the upper end of the worm gear shaft, and a rotating knob is connected to the outer end of the worm. A longitudinal base is fixed on the turntable. A longitudinal track is provided on the upper side of the longitudinal base. The longitudinal track is specifically a groove-shaped structure, and a longitudinal slider is fitted inside it. A longitudinal screw is installed along the longitudinal direction inside the longitudinal track. The longitudinal screw and the longitudinal slider are threaded together. A longitudinal knob is connected to the outer end of the longitudinal screw. A horizontal base is fixed to the horizontal slider. A horizontal track is provided on the upper side of the horizontal base. The horizontal track is specifically a groove-shaped structure, and a horizontal slider is fitted inside it. A horizontal screw is installed along the longitudinal direction inside the horizontal track. The horizontal screw and the horizontal slider are threaded together. A horizontal knob is connected to the outer end of the horizontal screw. The horizontal slider is fixed to the base. The laser emitting light plate is fixed to the upper side of the base.

[0010] Preferably, an airbag is fixed in the inner cavity of the base, the airbag is equipped with a suction nozzle, and the suction nozzle is connected to a negative pressure device through an air extraction pipe.

[0011] Preferably, extension plates are fixedly distributed around the perimeter of the base, and an auxiliary positioning mechanism is installed below each extension plate.

[0012] Preferably, a leveling mechanism is installed at the four corners of the base to ensure that the surface of the base is level.

[0013] The beneficial effects of this invention are as follows: By using laser technology and a control system, this solution effectively solves the problems of positioning difficulties and poor accuracy in the transportation and installation of T-beams by bridge erecting machines, thereby improving the accuracy, efficiency and safety of installation, which is especially beneficial for large-scale engineering projects.

[0014] 1. Improved Positioning Accuracy: Through the collaboration of the laser emitter and receiver, the position of the T-beam can be precisely monitored and corrected. This helps ensure that the T-beam is accurately positioned to the predetermined location during installation, reducing positioning difficulties and inaccuracies.

[0015] 2. Automatic Positioning Function: The controller in the solution automates the entire process to a certain extent, reducing reliance on manual operation. Once the laser signal is correctly received, the lifting system can automatically control the position of the T-beam, making positioning more accurate and efficient.

[0016] 3. Gradual Correction: By gradually turning the laser light strip on and off, the solution can gradually correct the positional error of the T-beam. This gradual correction method helps avoid sudden position adjustments and reduces potential impact and damage.

[0017] 4. Multi-directional adjustment: The design considers the need for multi-directional adjustment, including lateral and longitudinal adjustments. This means that regardless of which direction the T-beam has a problem, it can be corrected through corresponding adjustments, increasing installation flexibility.

[0018] 5. Real-time monitoring: The laser system used in this solution provides real-time monitoring to ensure the T-beams remain in precise position throughout the installation process. This helps avoid incorrect installation and improves the quality and safety of the project. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the laser emitting device of the monitoring and correction instrument in a specific implementation.

[0020] Figure 2 This is a schematic diagram showing the installation status of the laser receiver;

[0021] Figure 3 yes Figure 1 Perspective

[0022] Figure 4 yes Figure 1 Side view;

[0023] Figure 5 yes Figure 1 The attempt;

[0024] Figure 6 This is a schematic diagram illustrating the coordination between laser emission and reception.

[0025] Figure 7 This is a schematic diagram of the laser strip distribution on the laser emitting light board;

[0026] Figure 8 yes Figure 1 Assembly drawing;

[0027] Figure 9 This is a schematic diagram of an auxiliary positioning structure;

[0028] Figure 10 This is a schematic diagram of a leveling mechanism;

[0029] Figure 11 This is a partial circuit diagram of a laser emitting device;

[0030] Figure 12 This is a system block diagram of a laser receiving device.

[0031] Numbered in the diagram: Base 1; Rotating mechanism 2; Rotating knob 3; Turntable 4; Longitudinal base 5; Longitudinal rail 6; Longitudinal knob 7; Horizontal base 8; Horizontal rail 9; Base 10; Horizontal knob 11; Laser emitting light plate 12; Pad 13; Lower baseline 14; T-beam 15; Support top plate 16; Receiver group 17; Receiving area 18; Upper baseline 19; Airbag 20; Suction nozzle 21; Extension plate 22; Triangular prism 23; Connecting rod 24; Horizontal cylinder 25; Horizontal air pipe 26; Push-pull rod 27; Hinge rod 28; Vertical cylinder 29; Piston body 30; Milled surface 31; Sealing surface 32; Vent groove 33; Support leg 34; Support 35; Vertical air pipe 36. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] Example 1: After assembly, T-beams need to be closely fitted with other structural components (such as bridge piers) to ensure structural integrity and normal operation. Precise dimensional and positional control helps ensure the accuracy of this fit. A method is provided below... Figure 1 and Figure 2 The bridge erecting machine T-beam accuracy monitoring and correction device shown is designed to address the positioning difficulties and poor accuracy issues that arise when the bridge erecting machine relies solely on manual control during T-beam transportation and installation. This solution mainly includes a laser emitting device fixed to the center of the pier base plate and a laser receiving device fixed to the center of the T-beam end. These two devices work together to provide correction signals to the bridge erecting machine's lifting system. This solution achieves automatic positioning functionality based on the information provided by the correction device, building upon the initial manual control of the bridge erecting machine.

[0034] Specifically, such as Figure 1 The laser emitting device includes a base 1, an adjustment mechanism, and a laser emitting lamp plate 12, such as... Figure 6 and Figure 7 As shown, the laser emitting light panel 12 has a horizontal standard light area, two auxiliary light areas on both sides and a central auxiliary light area distributed in the middle. ① is the horizontal standard light area, ② is the two auxiliary light areas on both sides, ③ is the central auxiliary light area, and ④ is the vertical standard light area.

[0035] Outside the two horizontal standard light areas are the two auxiliary light areas, and inside the two horizontal standard light areas is the central auxiliary light area. Multiple laser emitting light strips are fixed vertically in the horizontal standard light areas, and multiple laser emitting light strips are fixed vertically in the auxiliary light areas and the central auxiliary light area. Two vertical standard light areas are distributed on the front and rear sides of the laser emitting light plate 12, and multiple laser emitting light strips are fixed horizontally in each vertical standard light area.

[0036] like Figure 2The laser receiving device includes a base and four sets of strip-shaped laser receivers. Two sets of laser receivers are fixed horizontally to the front and rear ends of the base, and the other two sets of laser receivers are fixed vertically to the left and right ends of the base. Two horizontal standard light areas correspond to the positions of the two sets of horizontal laser receivers, and two vertical standard light areas correspond to the positions of the two sets of vertical laser receivers.

[0037] like Figure 11 The controller of the laser emitting device is used to control the start and stop of the horizontal standard light zone, the central auxiliary light zone, and the vertical standard light zone, and also to control the auxiliary light zones on both sides to gradually turn off from the outside to the inside according to a certain time sequence. For example... Figure 12 The controller 2 of the laser receiver device is used to receive signals from the four sets of laser receivers respectively, and feed back each set of signals to the lifting system of the bridge erecting machine to provide correction guidance for the movement direction of the crane in the lifting system.

[0038] When the bridge erecting machine transports the T-beams to the top of the pier, each T-beam has a large longitudinal span. Its length is determined by the concrete T-beam length, generally ranging from 4m to 12m; its width is determined by the concrete T-beam width, generally ranging from 300mm to 1000mm; and its height is determined by the concrete T-beam height, generally ranging from 200mm to 600mm. Multiple T-beams are installed side-by-side on corresponding supports on the upper side of the same pier. Because each end of each T-beam has only one support, the bridge erecting machine requires high precision in hoisting, positioning, and installing the T-beams, presenting a significant positioning challenge. This is especially true when multiple T-beams need to be arranged side-by-side, requiring the bridge erecting machine's front and rear trolleys to move laterally simultaneously to maintain the gaps between the T-beams within the design range. The difficulty of adjusting the lateral movement is significantly greater than that of the longitudinal movement.

[0039] Figure 6 , Figure 7 and Figure 11 In the diagram, ① is the horizontal standard light area, ② are the auxiliary light areas on both sides, ③ are the central auxiliary light area, and ④ are the vertical standard light area. The horizontal standard light area can be one or more lines; the number of lines corresponds to different levels of precision, with fewer lines resulting in higher precision. It is usually designed with multiple lines, and the required number of lines are illuminated as needed. The controller can simultaneously control multiple lines or just one line to be illuminated.

[0040] Specific configurations include: Multiple auxiliary light strips arranged side-by-side on both sides, with controller 1 sequentially controlling the laser light strips to turn off in sequence based on the encoder. Multiple auxiliary light strips arranged side-by-side in the central area, with controller 1 simultaneously controlling both the central auxiliary light area to be fully on and off, or sequentially controlling the laser light strips to turn off in sequence based on the encoder. One or more vertical standard light strips, with different numbers corresponding to different levels of precision; typically designed with multiple strips, the number illuminated as needed. Controller 1 can simultaneously control multiple strips to be illuminated or a single strip to be illuminated, or sequentially control the laser light strips to turn off in sequence based on the encoder.

[0041] During construction, when the end of the T-beam being transported by the manually controlled bridge erecting machine approaches the top of the pier, controller one first illuminates all the light strips in all zones to allow the receivers to obtain approximate position information. Once all four receivers receive laser information, the system switches to automatic control mode for the lifting system. First, longitudinal control is performed, with all four light strips illuminated. Controller one then gradually extinguishes a portion of the light strips in the longitudinal standard light zone. While the upper and lower lateral receivers still receive signals, the remaining light strips are gradually extinguished until only one or several central light strips remain. During the partial extinguishing of light strips, if one of the upper or lower lateral receivers loses signal, the lifting system controls the longitudinal movement system to move towards the side with a signal. Next, lateral adjustment is performed, illuminating all the light strips in zones ①, ②, and ③. Then, controller one gradually extinguishes the auxiliary light zones on both sides from the outermost layer inwards until all are extinguished.

[0042] During this process, when both left and right longitudinal receivers have signals, the remaining light strips are gradually turned off. When one of the left or right longitudinal receivers can no longer receive a signal, the lifting system controls the lateral movement system to move towards the side with the signal (because the central auxiliary light area is always on, there is always at least one side receiving a signal, or both sides receiving signals).

[0043] When all four receivers have signals, and the left and right longitudinal receivers correspond to the horizontal standard light areas, and the upper and lower transverse receivers correspond to the vertical standard light areas, the central auxiliary light area is turned off. At this point, the positioning is accurate and meets the installation requirements of the support base (the support base has several forms, including multi-directional adjustable, transverse adjustable, longitudinal adjustable, and fixed). To further improve positioning accuracy, based on the above scheme, the above-mentioned lighting and extinguishing control method can be applied to the light strips in the transverse and vertical standard light areas to further improve accuracy and meet the installation requirements of the fixed support base. Alternatively, a controllable receiver outer casing component can be used, such as a light shield fitted on the outside of the laser receiver device, leaving only the positions of the four strip-shaped laser receivers as light-transmitting areas. Or, a light shield strip can be attached to the outside of the light-transmitting area, with a strip-shaped light-transmitting area in the center of the light shield strip. By changing the type of light shield strip, the area of ​​the light-transmitting area can be changed. When the light-transmitting area is small, higher projection accuracy is required.

[0044] When implementing the above solution, the following steps can be followed:

[0045] 1. Preparation: Ensure the bridge erecting machine and T-beams are in working condition; install the laser transmitter in the middle of the pier base plate; install the laser receiver at the center of the end of the T-beam (can be installed off-site in advance).

[0046] 2. System Activation: Activate controller one of the laser transmitter to illuminate the horizontal and vertical standard light areas; activate controller two of the laser receiver to prepare for receiving laser signals.

[0047] 3. T-beam transport: The bridge erecting machine begins to transport the T-beams to the top of the bridge piers for installation.

[0048] 4. Longitudinal control: When the T-beam approaches the top of the pier, the controller gradually controls the light strips in the longitudinal standard light zone to turn off; at the same time, it monitors the signal of the laser receiver. If there is a signal interruption, the lifting system controls the longitudinal movement system to move according to the side of the signal interruption to maintain signal stability.

[0049] 5. Lateral control: When the T-beam is in the correct position for longitudinal control, the controller gradually controls the light strips in the auxiliary light areas on both sides to turn off gradually; at the same time, it monitors the signal of the laser receiver. If there is a signal interruption, the lifting system controls the lateral movement system to move according to the side of the signal interruption to maintain signal stability.

[0050] 6. Positioning Complete: When all four receivers receive the laser signal and the signal is stable, the controller stops the light strip from turning on and off. At this point, the T-beam is accurately positioned on the support above the pier, completing the installation preparation.

[0051] 7. Safety Inspection: Conduct a final safety inspection to ensure that the T-beam is securely and firmly installed on the support.

[0052] 8. Records and Documentation: Record all data and monitoring results during the installation process for future reference.

[0053] These steps describe how to use laser precision monitoring devices to automate and refine the installation process of T-beams, ensuring accurate positioning and compliance with design requirements. This approach improves project safety and quality, and is particularly suitable for large-scale projects.

[0054] The above structural form and control method require ensuring that both the laser emitting light panel 12 and the receiver group 17 are in the standard baseline position. Since the receiver group 17 is pre-fixed with the T-beam and is already in the standard position, only precision adjustment of the position of the laser emitting light panel 12 is needed on-site. An adjustment mechanism is used, located between the base 1 and the laser emitting light panel 12, for adjusting the laser emitting light panel 12. This adjustment mechanism includes rotation adjustment, lateral adjustment, and longitudinal adjustment.

[0055] Specifically, such as Figure 8As shown, a rotating mechanism 2 is installed on the base 1. The rotating mechanism 2 includes a housing and an internal worm gear assembly. A turntable 4 is fixed to the upper end of the worm gear shaft, and a rotating knob 3 is connected to the outer end of the worm. A longitudinal base 5 is fixed on the turntable. A longitudinal rail 6 is provided on the upper side of the longitudinal base 5. The longitudinal rail 6 is specifically a groove-shaped structure, and a longitudinal slider is fitted inside it. A longitudinal screw is installed along the longitudinal direction inside the longitudinal rail, and the longitudinal screw is threadedly connected to the longitudinal slider. A longitudinal knob 7 is connected to the outer end of the longitudinal screw. A horizontal base 8 is fixed to the horizontal slider as a whole. A horizontal rail 9 is provided on the upper side of the horizontal base 8. The horizontal rail 9 is specifically a groove-shaped structure, and a horizontal slider is fitted inside it. A horizontal screw is installed along the longitudinal direction inside the horizontal rail, and the horizontal screw is threadedly connected to the horizontal slider. A horizontal knob 11 is connected to the outer end of the horizontal screw.

[0056] The horizontal slider is fixed to the base 10 as a whole, and the laser emitting light plate 12 is fixed to the upper side of the base 10.

[0057] An airbag 20 is fixed in the inner cavity of the base 1. The airbag 20 is equipped with a suction nozzle 21, which is connected to a negative pressure device through an air extraction pipe.

[0058] like Figure 1 In the bridge pier, a cross-shaped lower baseline is provided in the middle of the upper side pad 13. The airbag of the base 1 is positioned as close as possible to the center of the cross-shaped lower baseline. After the airbag is sucked in by the negative pressure device, it is fixed to the center of the pad. The base can also be fixed to the pad using expansion bolts, but to improve construction efficiency, the airbag can significantly improve the installation and removal efficiency of the base. Since the airbag cannot ensure the installation accuracy of the base, it cannot ensure the precise correspondence between the laser emitting light plate 12 and the receiver group 17. It is necessary to operate multiple knobs separately to ensure that the center lines of the four sides of the laser emitting light plate 12 correspond to the lower baseline 14.

[0059] Based on the above structural relationship, the precise adjustment mechanism for the laser emitting light panel ensures that it is in the standard baseline position with the receiver group. Therefore, the preparation work also includes the following:

[0060] 1. Preparation: Ensure that there is a cross-shaped lower baseline on the upper side plate of the pier for reference.

[0061] 2. Airbag fixing: Install the airbag 20 in the inner cavity of the base 1, and ensure that the airbag's suction nozzle 21 is located at the center of the cross-shaped lower baseline; use a negative pressure device to suction the airbag and firmly fix the airbag in the center of the pad.

[0062] 3. Rotation adjustment: Using the rotation mechanism 2, the rotation of the turntable 4 is controlled by the knob 3 so that the center line of one side of the laser emitting lamp plate 12 corresponds to the lower baseline 14.

[0063] 4. Longitudinal adjustment: Using the longitudinal rail 6 and longitudinal screw, and through the longitudinal knob 7, control the center line of the other side of the laser emitting lamp plate 12 to correspond with the lower baseline 14.

[0064] 5. Horizontal adjustment: Using the horizontal rail 9 and the horizontal screw, the center lines of the other two sides of the laser emitting lamp plate 12 are aligned with the lower baseline 14 by the horizontal knob 11.

[0065] 6. Inspection and verification: Ensure that the center lines of all four sides are accurately aligned with the lower baseline 14; conduct a final inspection and verification to ensure that the laser emitting light panel 12 is in the standard baseline position.

[0066] By following the above steps, it can be ensured that the laser emitting light panel 12 and the receiver group 17 are in the standard baseline position, thereby guaranteeing the accuracy and effectiveness of the laser precision monitoring system. This helps to ensure the accuracy and positioning precision during the T-beam installation process.

[0067] Alternatively, extension plates 22 can be fixed around the perimeter of the base 1. Below each extension plate 22, a triangular prism 23 is hinged via two parallel connecting rods 24. Each triangular prism 23 matches a V-shaped lower baseline groove distributed on the pier pad 13. A horizontal cylinder 25 is fixed laterally inside the base 1. A horizontal piston is fitted inside the horizontal cylinder 25, dividing it into an inner and outer air chamber. The inner air chamber is connected to the airbag 20 via a horizontal air pipe 26. A push-pull rod 27 is fixed towards the horizontal piston. The outer end of the push-pull rod 27 is hinged to a hinge rod 28 via a pin. The outer end of the hinge rod 28 is hinged to a connecting rod 24 via a pin. Thus, when the airbag 20 is under negative pressure, the horizontal piston moves to the left, causing the push-pull rod 27 to pull the connecting rod 24 inward, thereby causing the triangular prism 23 to move downward. After the triangular prism 23 moves downward, it can fit into the corresponding baseline groove. The above structure and control relationship can quickly position the base. When the triangular prism is aligned with the corresponding baseline groove, it can ensure that the center of each face of the base is accurately positioned in the baseline groove and that the angle of the base is accurate. After the base is initially positioned by this structure, when the base is fixed to the pad during the negative pressure suction period, the adjustment difficulty of the laser emitting lamp plate 12 can be reduced.

[0068] Additionally, it is possible to further consider fixing vertical cylinders 29 at the four corners of the base 1. A piston body 30 is fitted inside each vertical cylinder 29, dividing the cylinder 29 into an upper and lower chamber. A spring is fitted inside the lower chamber, causing the piston body to be positioned higher in its natural state. The upper chamber has a vent hole communicating with the outside. A milled surface 31 is provided on the inner side of the piston body 30. The upper part of the milled surface 31 is a sealing surface 32, and the lower part has a vent groove 33, which communicates with the lower chamber. A port seat is fixed to the rigid side wall of the vertical cylinder. The inner wall of this port seat is flat and can seal and slide against the surface of the milled surface. The air inlet seat is connected to the inner cavity of the airbag 20 via the vertical air pipe 36. When the airbag is under negative pressure, air in the lower air chamber is drawn into the airbag, causing the piston body 30 to move in detail. This causes the air inlet seat to move upward relative to the piston body until it is completely in contact with the sealing surface 32. At this point, the air inlet seat is sealed, preventing the piston body from moving further. The piston bodies of the four cylinders move the same distance in detail. Each piston body has a support leg 34 fixed at its lower end, and each support leg 34 has a support 35 installed at its lower end. The four corner supports 35 are simultaneously supported at the same height on the upper side of the pad. This ensures that the base 1 is in a horizontal state. When the negative pressure of the airbag is released, each support leg and its support are spring-supported and retracted upward. It can be seen that the supports at the four corners only extend to the same length when the airbag and the pad are fixed, ensuring that the surface of the base is parallel to the surface of the pad, thus ensuring that the surface of the base is horizontal. The four supports extend and retract synchronously with the airbag to ensure good contact and adsorption between the airbag and the pad.

[0069] The specific embodiments described above are merely illustrative or explanatory of the principles of the present invention and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of the present invention should be included within the protection scope of the present invention.

Claims

1. A bridge erecting machine T-beam accuracy monitoring and correction instrument, characterized in that, The system includes a laser emitting device fixed to the middle of the pier base plate and a laser receiving device fixed to the center of the T-beam end. The laser emitting device includes a base (1), an adjustment mechanism, and a laser emitting light plate (12). The laser emitting light plate (12) has a horizontal standard light area, two auxiliary light areas on both sides, and a central auxiliary light area distributed horizontally in the middle. The two auxiliary light areas are located outside the two strip-shaped horizontal standard light areas, and the central auxiliary light area is located inside the two strip-shaped horizontal standard light areas. Multiple laser emitting light strips are fixed vertically in the horizontal standard light areas, and multiple laser emitting light strips are fixed vertically in the auxiliary light areas and the central auxiliary light area. Two strip-shaped longitudinal standard light areas are distributed on the front and rear sides of the laser emitting light plate (12), and multiple laser emitting light strips are fixed horizontally in each longitudinal standard light area. The laser emitting light strip comprises a base and four sets of strip-shaped laser receivers. Two sets of laser receivers are fixed laterally to the front and rear ends of the base, and the other two sets are fixed vertically to the left and right ends of the base. Two horizontal standard light zones correspond to the positions of the two sets of horizontal laser receivers, and two vertical standard light zones correspond to the positions of the two sets of vertical laser receivers. Controller 1 of the laser emitting device controls the start and stop of the horizontal standard light zones, the central auxiliary light zone, and the vertical standard light zones. It also controls the auxiliary light zones on both sides to gradually extinguish from the outside to the inside according to a certain time sequence. Controller 2 of the laser receiver device receives signals from the four sets of laser receivers and feeds each signal back to the crane's lifting system, providing correction guidance for the crane's movement direction.

2. The bridge erecting machine T-beam accuracy monitoring and correction instrument according to claim 1, characterized in that, A light-blocking cover is fitted on the outside of the laser receiver, leaving only the four strip-shaped laser receiver positions as light-transmitting areas.

3. The bridge erecting machine T-beam accuracy monitoring and correction instrument according to claim 2, characterized in that, A light-blocking strip is affixed to the outside of the light-transmitting area, and there is a strip-shaped light-transmitting area in the center of the light-blocking strip.

4. The bridge erecting machine T-beam accuracy monitoring and correction instrument according to claim 1, characterized in that, The adjustment mechanism is located between the base (1) and the laser emitting lamp plate (12) and is used to adjust the laser emitting lamp plate (12). It includes rotation adjustment, horizontal adjustment and vertical adjustment.

5. The bridge erecting machine T-beam accuracy monitoring and correction instrument according to claim 4, characterized in that, A rotating mechanism (2) is installed on the base (1). The rotating mechanism (2) includes a housing and an internal worm gear assembly. A turntable (4) is fixed to the upper end of the worm gear shaft. A rotating knob (3) is connected to the outer end of the worm. A longitudinal base (5) is fixed on the turntable. A longitudinal rail (6) is provided on the upper side of the longitudinal base (5). The longitudinal rail (6) is specifically a groove structure. A longitudinal slider is fitted inside it. A longitudinal screw is installed along the longitudinal direction inside the longitudinal rail. The longitudinal screw and the longitudinal slider are threaded together. The outer end of the rod is connected to a longitudinal knob (7), the horizontal base (8) and the horizontal slider are fixed together, the upper side of the horizontal base (8) is provided with a horizontal rail (9), the horizontal rail (9) is specifically a groove structure, the horizontal slider is fitted inside, the horizontal screw is installed along the longitudinal direction inside the horizontal rail, the horizontal screw and the horizontal slider are threaded together, the outer end of the horizontal screw is connected to a horizontal knob (11), the horizontal slider and the base (10) are fixed together, and the laser emitting lamp plate (12) is fixed on the upper side of the base (10).

6. The bridge erecting machine T-beam accuracy monitoring and correction instrument according to claim 1, characterized in that, An airbag (20) is fixed in the inner cavity of the base (1). The airbag (20) is equipped with a suction nozzle (21), which is connected to a negative pressure device through a suction pipe.

7. The bridge erecting machine T-beam accuracy monitoring and correction instrument according to claim 1, characterized in that, Extended plates (22) are fixed around the perimeter of the base (1), and an auxiliary positioning mechanism is installed below each extended plate (22).

8. The bridge erecting machine T-beam accuracy monitoring and correction instrument according to claim 1, characterized in that, A leveling mechanism is installed at the four corners of the base (1) to ensure that the surface of the base (1) is level.

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