Sliding force control method for large-span structure sliding construction in complex environment

Abstract

The invention discloses a sliding force synchronous control method for sliding construction of a large-span structure in a complex environment, distributed hydraulic driving units are arranged on a sliding rail, the adjacent driving units are linked through a mechanical synchronizing mechanism, and angle deviation compensation is completed through a cross universal joint and a differential compensator. By designing and combining a redundant hydraulic loop technology, a pressure compensation valve and a logic reversing valve are integrated in a sliding system, the hydraulic response speed is increased, the sliding force synchronous control method has the advantage of self-adaptive deviation correction, multi-point speed deviation accumulation can be eliminated, the sliding synchronous precision is guaranteed from the structural level, and the service life of the sliding system is prolonged. And a polytetrafluoroethylene-bronze composite friction layer is adopted in the sliding shoe assembly, the fluctuation of the friction coefficient can be effectively reduced, and the functions of real-time displacement monitoring, dynamic pressure compensation and system safety protection are achieved through the arrangement of a closed-loop feedback module and a mechanical overload protector.

Description

Technical Field

[0001] The present invention relates to the technical field of large-span structure construction in civil engineering, and particularly to a synchronous control method for slip forces in the slip construction of large-span structures in complex environments. Background Art

[0002] In the construction of large-span structures, traditional slip technologies have problems such as low multi-point synchronization accuracy (error > 5 mm / m), lag in the response of the hydraulic system (1.2 - 2 s), and fluctuations in the friction coefficient affected by environmental temperature, leading to an increased risk of structural stress concentration. As the span exceeds 200 meters, the existing rigid connection systems are prone to system jamming in complex environments, with a high delay in manual deviation correction and difficulty in meeting the millimeter-level accuracy requirements, resulting in an increase in the engineering accident rate. During slip construction in complex environments, traditional methods have a risk of trajectory deviation caused by the accumulation of multi-point slip speed deviations, mainly manifested as significant synchronous errors generated by uneven pressure transmission at each driving point during the slip process; the problem of response lag in the hydraulic system caused by pressure loss at the distal end, severely restricting the dynamic coordination of the slip action; large fluctuations in the friction coefficient of the slip interface affected by environmental temperature changes, affecting the stability of the slip speed; the rigid connection system is prone to mechanical jamming when local loads are abnormal, reducing the system reliability. There is an urgent need to develop new synchronous control technologies. Summary of the Invention

[0003] The purpose of the present invention is to solve the problem of synchronous control of slip forces in the slip construction of large-span structures in complex environments. In the slip construction of large-span structures in complex environments, traditional slip technologies have low multi-point synchronization accuracy, resulting in the accumulation of slip trajectory deviations and a significant increase in the risk of structural stress concentration; the response lag of the hydraulic system causes uneven pressure transmission in the driving units and poor dynamic coordination; the friction coefficient of the slip interface is greatly affected by environmental temperature fluctuations, and uneven lubricant distribution leads to insufficient stability of the slip speed; the rigid connection system is prone to mechanical jamming when local loads are abnormal, reducing the system reliability and increasing the engineering accident rate; the manual deviation correction delay is relatively large, unable to correct the slip trajectory deviation in real time, and the synchronization accuracy is difficult to meet the millimeter-level requirements; at the same time, the dynamic change of the unevenness of the slip track lacks an adaptive correction mechanism, and the accumulation of synchronous errors is aggravated, seriously affecting the construction safety. To solve the above problems, the present invention provides a synchronous control method for slip forces in the slip construction of large-span structures in complex environments.

[0004] The technical solution adopted by the present invention is as follows:

[0005] The hydraulic jacking devices (2) are distributed along the sliding track (1) at intervals of 3 - 5 m. The adjacent jacking devices (2) are connected by a rigid synchronizing shaft (4 - 1). Universal joints (4 - 2) are configured at both ends of the synchronizing shaft (4 - 1) to achieve multi - directional angle compensation. A polytetrafluoroethylene - bronze gradient composite friction layer (5) is provided at the bottom of the sliding shoes of each jacking device (2). Wave - shaped oil storage grooves (5 - 4) with a depth of 0.8 - 1.5 mm are formed on the surface of the composite friction layer (5) for lubricant storage and friction coefficient stabilization. A pilot - operated pressure compensation valve (3 - 4) and an electromagnetic reversing valve (3 - 6) are arranged in parallel in the hydraulic circuit. The pressure compensation valve (3 - 4) is used to dynamically balance the load pressure of each jacking device (2), and the reversing valve (3 - 6) switches the oil supply path through logical control. A laser displacement sensor array is arranged on the side of the sliding track (1) at intervals of 2 m. The sensor array monitors the sliding displacement deviation in real time and feeds it back to the control system. Among them, the distributed hydraulic jacking devices (2), the synchronizing shaft (4 - 1) and the universal joints (4 - 2) constitute a mechanical linkage unit. The pressure compensation valve (3 - 4) and the reversing valve (3 - 6) in the hydraulic circuit cooperate to adjust the jacking pressure and flow rate. The composite friction layer (5) and the laser displacement sensor array work together to achieve synchronous control of the sliding force and trajectory correction through closed - loop feedback, ensuring millimeter - level synchronous accuracy.

[0006] Furthermore, a planetary gear differential (4) is integrated in the middle of the rigid synchronizing shaft (4 - 1). The differential (4) consists of a sun gear, a planetary gear set and an outer gear ring. The planetary gear set is installed in the differential housing through needle bearings. The outer gear ring is rigidly connected to the input end of the synchronizing shaft (4 - 1), and the sun gear is linked to the output end through a spline sleeve. The output end of the differential (4) is connected to a high - precision angle sensor. The angle sensor adopts an optoelectronic encoder or a magnetoelectric non - contact measurement structure to detect the rotation angle difference on both sides of the synchronizing shaft (4 - 1) in real time. When the rotational speeds of the two - side jacking devices (2) are different during the sliding process due to uneven tracks or uneven loads, the differential (4) automatically adjusts the rotational speeds of the output shafts on both sides through the torque distribution of the planetary gear set. At the same time, the angle sensor transmits the detected angle deviation signal to the control system, triggering the dynamic pressure compensation of the hydraulic jacking device (2) and the flow rate adjustment of the logic reversing valve (3 - 6) to achieve real - time closed - loop correction of the sliding trajectory, ensuring that the synchronous accuracy between multiple drive units is better than ±1 mm / m.

[0007] Furthermore, the composite friction layer (5) consists of three layers. The upper layer is a PTFE wear - resistant layer (5 - 1), the middle layer is a bronze transition layer (5 - 2), and the lower layer is a steel substrate (5 - 3).

[0008] Furthermore, a wedge - shaped leveling mechanism (7) is provided at the front end of the hydraulic jacking device (2). The inclination angle of the leveling block is 5° - 8°, and an elliptical grease injection hole (7 - 1) with a diameter of 10 mm is formed on the bottom surface.

[0009] Furthermore, a prestressed anchoring device (6-3) is provided at the joint of the sliding track (1), which includes a bidirectional tensioning bolt (6-4) and a disc spring group (6-5).

[0010] Furthermore, the laser displacement sensor array is connected to the PLC controller via the RS485 bus, and the sampling frequency is ≥100Hz.

[0011] Furthermore, the hydraulic system is provided with a dual-pump redundant oil supply circuit (3-2), which includes a main hydraulic pump and a standby hydraulic pump operating in parallel. The oil circuits between the two are isolated and the pressure is maintained through a hydraulic control check valve (3-3); the hydraulic control check valve (3-3) is configured to automatically lock the failed circuit when a single-side pump group fails, and switch to the standby pump oil supply path through a logic directional control valve (3-6), while maintaining the system pressure balance; the dual-pump redundant oil supply circuit (3-2) and the pilot-operated pressure compensating valve (3-4) work together to achieve flow balance through dynamic pressure compensation during load mutations or local pressure fluctuations, ensuring the synchronous drive stability of the distributed hydraulic jacking device (2).

[0012] Furthermore, a temperature compensation section is provided at the foundation of the sliding track (1), and expansion joints (6-1) are arranged every 30m, with a joint width of 20-30mm, and silicone sealant (6-2) is filled inside.

[0013] Advantages of the present invention:

[0014] (1) Provide a distributed hydraulic drive unit and a pressure compensating valve, and eliminate the response lag caused by remote pressure loss by independently controlling the hydraulic pressure at each sliding point; its advantages are: achieving high-precision synchronization of multi-point sliding, improving the response speed of the hydraulic system, and being applicable to large-span construction scenarios.

[0015] (2) Provide a mechanical synchronization mechanism including a differential compensator, and achieve angle deviation compensation through a gear set and a torque limiter; its advantages are: automatically correcting the deviation of the sliding track, enhancing the anti-overload ability of the system, and reducing the need for manual intervention.

[0016] (3) Provide a composite friction layer for the adaptive sliding shoe assembly, with an oil storage groove structure on the surface; its advantages are: significantly reducing the fluctuation of the friction coefficient, adapting to a wide temperature range environment, and improving the stability of the sliding speed.

[0017] (4) Provide a redundant hydraulic circuit and a logic directional control valve to achieve rapid switching of the oil supply path; its advantages are: greatly improving the reliability of the system and ensuring the continuous construction ability.

[0018] (5) Provide a closed-loop feedback module and a wedge leveling mechanism to monitor and correct the track unevenness in real time; its advantages are: ensuring millimeter-level synchronization accuracy and reducing the risk of structural stress concentration.

[0019] (6) Provide a mechanical overload protector and a ball joint, combined with dynamic deflection compensation; its advantages are: effectively preventing system jamming and damage, and reducing equipment maintenance costs.

[0020] (7) Provide a combined design of two-way tensioning bolts and a disc spring group; its advantages are: while absorbing shocks, it can dynamically adjust the joint pre-tightening force. Description of the Drawings

[0021] Figure 1 It is the overall layout diagram of the system;

[0022] Figure 2 It is the schematic diagram of the hydraulic control principle;

[0023] Figure 3 It is the structure diagram of the track joint;

[0024] Figure 4 It is the schematic diagram of the rigid synchronous shaft and the composite friction layer

[0025] In the figure, 1 is the sliding track; 2 is the hydraulic jacking device; 3 is the hydraulic device; 4 is the planetary gear differential; 5 is the polytetrafluoroethylene-bronze gradient composite friction layer; 6 is the track joint;

[0026] 3-1 is the line; 3-2 is the double-pump redundant oil supply circuit; 3-3 is the hydraulic check valve; 3-4 is the pilot-operated pressure compensation valve; 3-6 is the electromagnetic reversing valve;

[0027] 4-1 is the rigid synchronous shaft; 4-2 is the cross universal joint;

[0028] 5-1 is the PTFE wear-resistant layer; 5-2 is the bronze transition layer; 5-3 is the steel substrate; 5-4 is the wavy oil storage tank

[0029] 6-1 is the expansion joint; 6-2 is the filled silicone sealant; 6-3 is the prestressed anchoring device; 6-4 is the two-way tensioning bolt; 6-5 is the disc spring group;

[0030] Combined with the legend, the embodiments are described in detail Specific Embodiments

[0031] The present invention will be described in detail below in conjunction with the drawings and embodiments

[0032] As Figure 1 In the figure, it shows the overall layout diagram of the system, the upper half is the partial enlarged view, and the lower half is the overall view;

[0033] As Figure 2As shown in the figure, it is a schematic diagram of hydraulic control. When the hydraulic system starts, the main hydraulic pump in the dual-pump redundant oil supply circuit 3-2 supplies oil preferentially. The hydraulic control check valve 3-3 keeps the main circuit unobstructed. The pilot-operated pressure compensation valve 3-4 dynamically adjusts the load pressure of each hydraulic jacking device 2 according to the displacement deviation signal fed back by the laser displacement sensor array. When the local load suddenly changes or the track unevenness causes the pressure imbalance of the drive unit, the electromagnetic directional valve 3-6 switches the oil supply path through logical control. At the same time, after the differential 4 detects the angle difference on both sides of the synchronizing shaft 4-1, it triggers the pressure compensation valve 3-4 to relieve the pressure of the jacking device 2 on the high-pressure side for compensation, and the low-pressure side supplements the flow through the directional valve 3-6. If the main pump fails, the hydraulic control check valve 3-3 automatically locks the failed circuit and switches to the standby pump for oil supply to maintain the system pressure stability. Finally, the slip trajectory is corrected in real time through closed-loop feedback.

[0034] As Figure 3 As shown in the figure, it is a structural diagram of the track joint. At the joint of the slip track 1, a prestressed anchoring device 6-3 is set. The pre-tightening force is applied through the bidirectional tensioning bolt 6-4 to make both sides of the joint fit tightly. The disc spring group 6-5 absorbs the instantaneous impact force generated by uneven load or vibration during the slip process to prevent the joint from being misaligned. The expansion joint 6-1 is arranged every 30m in the temperature compensation section, with a joint width of 20-30mm, and the silicone sealant 6-2 is filled inside. When the temperature change causes the track to expand and contract thermally, the silicone sealant 6-2 elastically deforms with the change of the width of the expansion joint 6-1, releases the temperature stress and maintains the sealing performance. If local deformation occurs during the long-term use of the track, the flatness of the joint is dynamically corrected by adjusting the pre-tightening force of the bidirectional tensioning bolt 6-4 and combining the buffering effect of the disc spring group 6-5 to ensure the track continuity and the slip synchronization accuracy.

[0035] As Figure 4 As shown in the figure, it is a schematic diagram of the rigid synchronizing shaft and the composite friction layer. The left half is an example diagram of the rigid synchronizing shaft, and the right half is an example diagram of the composite friction layer. The rigid synchronizing shaft 4-1 is connected to the adjacent hydraulic jacking device 2 through the universal joints 4-2 at both ends to achieve multi-directional angle compensation. The planetary gear differential 4 is integrated in the middle. When the track unevenness or uneven load causes the speed difference on both sides, the differential 4 automatically distributes the torque and adjusts the output shaft speed. The angle sensor detects the deviation in real time and triggers the hydraulic system for dynamic compensation. The composite friction layer 5 is composed of a gradient structure of a PTFE wear-resistant layer 5-1, a bronze transition layer 5-2 and a steel substrate 5-3. The surface wavy oil storage grooves 5-4 store lubricants to reduce the friction coefficient fluctuation caused by temperature change, ensure low friction and stability at the slip interface, and improve the synchronous control accuracy.

Claims

1. A method for controlling the sliding force of a long-span structure during sliding construction in a complex environment, characterized in that, The control method includes: Hydraulic jacking devices (2) are distributed along the sliding track (1) at intervals of 3 - 5 m. The adjacent jacking devices (2) are connected by a rigid synchronous shaft (4-1). Cross universal joints (4-2) are configured at both ends of the synchronous shaft (4-1) to achieve multi-directional angle compensation. A polytetrafluoroethylene-bronze gradient composite friction layer (5) is provided at the bottom of the sliding shoes of each jacking device (2). Wave-shaped oil storage grooves (5-4) with a depth of 0.8 - 1.5 mm are formed on the surface of the composite friction layer (5) for lubricant storage and friction coefficient stabilization. A pilot-operated pressure compensation valve (3-4) and an electromagnetic reversing valve (3-6) are arranged in parallel in the hydraulic circuit. The pressure compensation valve (3-4) is used to dynamically balance the load pressure of each jacking device (2), and the reversing valve (3-6) switches the oil supply path through logical control. A laser displacement sensor array is arranged on the side of the sliding track (1) at intervals of 2 m. The sensor array monitors the sliding displacement deviation in real time and feeds it back to the control system. Among them, the distributed hydraulic jacking devices (2), the synchronous shaft (4-1) and the cross universal joints (4-2) form a mechanical linkage unit. The pressure compensation valve (3-4) and the reversing valve (3-6) in the hydraulic circuit cooperate to adjust the jacking pressure and flow rate. The composite friction layer (5) and the laser displacement sensor array work together to achieve synchronous control of the sliding force and trajectory correction through closed-loop feedback, ensuring a synchronous accuracy of millimeter level.

2. The slip force control method for the large-span structure slip construction in complex environments according to claim 1, characterized in that: A planetary gear differential (4) is integrated in the middle of the rigid synchronous shaft (4-1). The differential (4) consists of a sun gear, a planetary gear set and an external gear ring. The planetary gear set is installed in the differential housing through needle bearings. The external gear ring is rigidly connected to the input end of the synchronous shaft (4-1), and the sun gear is linked to the output end through a spline sleeve. The output end of the differential (4) is connected to a high-precision angle sensor. The angle sensor adopts an optoelectronic encoder or a magnetoelectric non-contact measurement structure to detect the rotational angle difference on both sides of the synchronous shaft (4-1) in real time. When there is a rotational speed difference between the two side jacking devices (2) during the sliding process due to uneven track or uneven load, the differential (4) automatically adjusts the rotational speeds of the output shafts on both sides through the torque distribution of the planetary gear set. At the same time, the angle sensor transmits the detected angle deviation signal to the control system, triggering the dynamic pressure compensation of the hydraulic jacking device (2) and the flow rate adjustment of the logic reversing valve (3-6) to achieve real-time closed-loop correction of the sliding trajectory and ensure that the synchronous accuracy between multiple drive units is better than ±1 mm / m.

3. The slip force control method for large-span structure slip construction in complex environment according to claim 1, characterized in that: The composite friction layer (5) consists of three layers. The upper layer is a PTFE wear-resistant layer (5-1), the middle layer is a bronze transition layer (5-2), and the lower layer is a steel substrate (5-3).

4. The method for controlling the sliding force in the sliding construction of a long-span structure in a complex environment according to claim 1, wherein: A wedge-shaped leveling mechanism (7) is provided at the front end of the hydraulic jacking device (2). The inclination angle of the leveling block is 5° - 8°, and an elliptical grease injection hole (7-1) with a diameter of 10 mm is formed on the bottom surface.

5. The slip force control method for large-span structure slip construction in complex environments according to claim 1, wherein: A prestressed anchoring device (6-3) is provided at the joint of the sliding track (1), including a bidirectional tensioning bolt (6-4) and a disc spring group (6-5).

6. The slip force control method for large-span structure slip construction in complex environment according to claim 1, wherein: The laser displacement sensor array is connected to the PLC controller via the RS485 bus, and the sampling frequency is ≥100Hz.

7. The slip force control method for large-span structure slip construction in complex environment according to claim 1, characterized in that: The hydraulic system is provided with a dual-pump redundant oil supply circuit (3-2), which includes a main hydraulic pump and a standby hydraulic pump operating in parallel. The oil circuits between the two circuits are isolated and the pressure is maintained through a pilot-operated check valve (3-3); the pilot-operated check valve (3-3) is configured to automatically lock the failed circuit in case of a single-side pump group failure, and switch to the standby pump oil supply path through a logic directional control valve (3-6), while maintaining the system pressure balance; the dual-pump redundant oil supply circuit (3-2) and the pilot-operated pressure compensation valve (3-4) cooperate with each other. When the load suddenly changes or there are local pressure fluctuations, the flow rate is balanced through dynamic pressure compensation to ensure the synchronous drive stability of the distributed hydraulic jacking device (2).

8. The method for controlling the sliding force in the sliding construction of a long-span structure in a complex environment according to claim 1, wherein: The foundation of the sliding track (1) is provided with a temperature compensation section, and expansion joints (6-1) are arranged every 30m, with a joint width of 20-30mm, and silicone sealant (6-2) is filled inside.

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