Refined hoisting control method for steel-concrete combined section of civil structure

Abstract

The invention discloses a refined hoisting control method for a civil structure steel-concrete combined section. The refined hoisting control method comprises the following steps: carrying out hoisting lifting operation on a steel-concrete structure section according to an improved graded loading mechanism under a preset working condition; after the steel-concrete structure section is lifted to the designed elevation position, adjusting the attitude of the steel-concrete structure in the air according to a preset structure attitude adjusting algorithm; and carrying out posture locking on the adjusted reinforced concrete structure section. By means of the improved graded loading mechanism, it can be effectively guaranteed that the civil structure steel-concrete combined section is smoothly and completely lifted, a structural posture adjustment algorithm is adopted for conducting aerial posture adjustment on the steel-concrete structure, and the posture adjustment precision of the mixed material structure can be improved.

Description

Technical Field

[0001] The invention belongs to the technical field of civil construction, and in particular relates to a refined hoisting control method for a steel-concrete combined section of a civil structure. Background Art

[0002] At present, in the construction process of steel-concrete joint sections of main beams of large civil structures, traditional steel-concrete joint section construction generally adopts high-altitude erection of assembly platforms, high-altitude on-site assembly methods, or conventional hoisting methods. However, these two conventional construction methods have many disadvantages. Due to the complex structure of the steel-concrete joint section, the amount of temporary measures for the high-altitude assembly platform is too large, which increases the safety risk factor of high-altitude operations, and on-site assembly increases the installation construction period. If the conventional hoisting scheme is adopted, the installation process is cumbersome, which is easy to cause structural damage such as cracks at the joints of the steel-concrete joint section, and the positioning is inaccurate, and repeated positioning operations are required, resulting in low construction accuracy and slow operation speed.

[0003] To this end, the present invention proposes a refined hoisting control method for the steel-concrete combined section of a civil structure to solve the current technical problems existing in the industry, effectively improve construction accuracy and ensure construction quality. Summary of the invention

[0004] The present invention provides a refined hoisting control method for a steel-concrete joint section of a civil structure, which solves several deficiencies of conventional hoisting proposed in the above-mentioned background technology, improves the construction accuracy of hydraulic lifting and hoisting of the steel-concrete joint section of the civil structure, and ensures the construction quality.

[0005] The present invention provides a refined hoisting control method for a steel-concrete combined section of a civil engineering structure, comprising:

[0006] Under the preset working conditions, the steel-concrete structure section is hoisted and lifted according to the improved graded loading mechanism, wherein the expression of the improved graded loading mechanism is:

[0007]

[0008] In the formula, p(t) is the control deviation, a(t) is the set value, c(t) is the actual output value, y(t) is the control output, and Z I is the proportionality coefficient, J Tis the integral time constant, K is the motor speed, S is the displacement corresponding to the target level of loading and unloading, D is the number of movable pulleys, d is the reduction ratio of the reducer, r is the drum radius, T is the single-stage loading and unloading time, n is the number of loading levels, K(h) is the real-time output speed of the motor at the hth time, K(h-1) is the real-time output speed of the motor at the h-1th time, p(h) is the difference between the hth set pressure and the actual pressure, p(h-1) is the difference between the h-1th set pressure and the actual pressure, p(h-2) is the difference between the h-2th set pressure and the actual pressure, f(h) is the hth collected pressure, F(h) is the hth set pressure, Z J is the integration coefficient, Z W is the differential coefficient, f m is the target tension, f is the actual tension;

[0009] After the steel-concrete structure section is lifted to the designed elevation position, the steel-concrete structure is adjusted in the air according to a preset structural attitude adjustment algorithm;

[0010] The adjusted steel-concrete structural section is posture-locked.

[0011] Furthermore, the expression of the preset structure posture adjustment algorithm is:

[0012]

[0013] Where L is the total length of the steel-concrete joint section, M is the moment of the steel-concrete joint section’s deadweight on the leftmost lifting point, is the bulk density, S is the cross-sectional area of ​​the steel-concrete joint section, h′ is the height of the hanging point from the steel-concrete joint section, m is the mass of the steel-concrete joint section, is the lifting coefficient, k is the deadweight coefficient, F is the other load acting on the steel-concrete joint section, X is the horizontal distance from the other load action point to the center point of the steel-concrete joint section, and f y is the vertical force acting on the steel-concrete joint section, f x is the horizontal force acting on the steel-concrete joint section, θ is the vertical angle between the sling and the action point of the steel-concrete joint section, T is the control force, d L For integral operation.

[0014] Furthermore, after the adjusted steel-concrete structural section is posture-locked, the method further comprises:

[0015] After the interfaces at both ends of the steel-concrete combined section are welded and fixed, the steel-concrete structural section is hoisted and dismantled according to a graded disassembly mechanism, wherein the graded disassembly mechanism is the reverse process of the improved graded loading mechanism.

[0016] The refined hoisting control method of the steel-concrete joint section of the civil structure of the present application can effectively ensure the smooth and complete lifting of the steel-concrete joint section of the civil structure through an improved graded loading mechanism, and adopts a structural attitude adjustment algorithm to adjust the attitude of the steel-concrete structure in the air, which can improve the attitude adjustment accuracy of the mixed material structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 A flowchart of a refined hoisting control method for a steel-concrete combined section of a civil structure provided by an embodiment of the present invention;

[0019] Figure 2 A flowchart of a refined hoisting control method for a steel-concrete joint section of a civil structure is provided for one embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] See also Figure 1 , which shows a flow chart of a refined hoisting control method for a steel-concrete combined section of a civil structure of the present application.

[0022] like Figure 1 As shown in the figure, the refined hoisting control method of the steel-concrete combined section of the civil structure specifically includes the following steps:

[0023] Step S101, performing hoisting and lifting operations on the steel-concrete structure segment according to the improved graded loading mechanism under preset working conditions.

[0024] In this step, the expression of the improved hierarchical loading mechanism is:

[0025]

[0026] In the formula, p(t) is the control deviation, a(t) is the set value, c(t) is the actual output value, y(t) is the control output, and Z Iis the proportionality coefficient, J T is the integral time constant, K is the motor speed, S is the displacement corresponding to the target level of loading and unloading, D is the number of movable pulleys, d is the reduction ratio of the reducer, r is the drum radius, T is the single-stage loading and unloading time, n is the number of loading levels, K(h) is the real-time output speed of the motor at the hth time, K(h-1) is the real-time output speed of the motor at the h-1th time, p(h) is the difference between the hth set pressure and the actual pressure, p(h-1) is the difference between the h-1th set pressure and the actual pressure, p(h-2) is the difference between the h-2th set pressure and the actual pressure, f(h) is the hth collected pressure, F(h) is the hth set pressure, Z J is the integration coefficient, Z W is the differential coefficient, f m is the target tension, and f is the actual tension.

[0027] It should be noted that the improved hierarchical loading mechanism mainly includes the following steps:

[0028] The loading system is loaded at 10% of the design load at the loading point, and stops for 20 seconds after loading is completed to maintain the load;

[0029] Compare the load setting value with the actual output value, calculate the output error, and adjust the motor control deviation;

[0030] The loading system is loaded at 25% of the design load at the loading point, and stops for 15 seconds after loading is completed to maintain the load;

[0031] The loading system is loaded at 55% of the design load at the loading point, and stops for 10 seconds after loading is completed to maintain the load;

[0032] Reduce the loading deviation according to the control system deviation signal, and adjust the real-time output speed of the motor according to the difference between the set pressure and the actual pressure;

[0033] The loading system is loaded at 75% of the design load at the loading point, and stops for 15 seconds after loading is completed to maintain the load;

[0034] According to the deviation between the target tension and the actual tension, the last loading control system error adjustment is performed;

[0035] The loading system is loaded at 100% of the design load at the loading point, and stops for 20 seconds after loading is completed to maintain the load;

[0036] The traditional lifting and graded loading method is usually more suitable for structures with single material properties, but it is not friendly to the mixed material structure of the steel-concrete joint section of the civil structure. Structural damage such as cracks is prone to occur at the joints of the mixed materials. By adopting the improved graded loading mechanism proposed in this application, the smooth and complete lifting of the steel-concrete joint section of the civil structure can be effectively guaranteed.

[0037] Step S102, after the steel-concrete structure section is lifted to the designed elevation position, the steel-concrete structure is adjusted in the air according to a preset structural attitude adjustment algorithm.

[0038] In this step, the expression of the preset structural posture adjustment algorithm is:

[0039]

[0040] Where L is the total length of the steel-concrete joint section, M is the moment of the steel-concrete joint section’s deadweight on the leftmost lifting point, is the bulk density, S is the cross-sectional area of ​​the steel-concrete joint section, h′ is the height of the hanging point from the steel-concrete joint section, m is the mass of the steel-concrete joint section, is the lifting coefficient, k is the deadweight coefficient, F is the other load acting on the steel-concrete joint section, X is the horizontal distance from the other load action point to the center point of the steel-concrete joint section, and f y is the vertical force acting on the steel-concrete joint section, f x is the horizontal force acting on the steel-concrete joint section, θ is the vertical angle between the sling and the action point of the steel-concrete joint section, T is the control force, d L For integral operation.

[0041] In this step, the posture adjustment process of the steel-concrete joint section mainly includes the following steps:

[0042] The vertical height of the locked steel-concrete joint section remains unchanged;

[0043] After standing for 30 minutes, until the steel-concrete joint section no longer moves due to mechanical action;

[0044] Adjust the horizontal moment of the left lifting point so that the left structure is at the designed position;

[0045] Adjust the horizontal moment of the lifting point on the right side by jogging. After each jogging adjustment, let it stand for 1 minute to make the right side structure in the designed position. At this time, the rough positioning of the horizontal position is completed;

[0046] Adjust the vertical angle θ and lifting coefficient between the sling and the steel-concrete joint section Complete the aerial angle calibration of the steel-concrete joint section until the designed aerial attitude requirements are met, and the attitude adjustment of the entire steel-concrete joint section is completed;

[0047] The existing structural attitude adjustment algorithm has a large range of single adjustment, and is difficult to adapt to working conditions with high requirements for the attitude adjustment accuracy of mixed material structures. By adopting the proposed new structural attitude adjustment algorithm, higher-precision aerial attitude adjustment can be achieved for the steel-concrete joint section of civil structures.

[0048] Step S103, locking the posture of the adjusted steel-concrete structure segment.

[0049] In summary, the traditional lifting and graded loading method is usually more suitable for structures with single material properties, but it is not friendly to the mixed material structure of the steel-concrete joint section of the civil structure. Structural damage such as cracks is prone to occur at the joints of the mixed materials. The method of the present application can effectively ensure the smooth and complete lifting of the steel-concrete joint section of the civil structure through an improved graded loading mechanism, and can achieve higher-precision aerial attitude adjustment for the steel-concrete joint section of the civil structure through the structural attitude adjustment algorithm.

[0050] See also Figure 2 , which shows a flow chart of a refined hoisting control method for a steel-concrete combined section of a civil structure according to a specific embodiment of the present application.

[0051] like Figure 2 As shown, S1, preparation before lifting, carries out lifting operation under the condition that the environmental wind force is less than level 6, and deploys the mechanical equipment related to the lifting operation in place.

[0052] In this step, preparations are made before hoisting. Hoisting operations are carried out under conditions where the wind speed is less than level 6, and mechanical equipment related to hoisting operations are deployed in place. When the steel-concrete joint section is assembled on the ground, the auxiliary components can be pre-installed on the ground, and two lifting points are arranged on the top surface of the steel-concrete joint section. When installing the Bailey truss and the hydraulic lifter of the super-large component, the lifter seat is installed on the lifting beam, and the lifting beam falls on the Bailey truss. The rear anchor point of the Bailey truss is anchored to the concrete beam through an alloy full-thread screw.

[0053] When connecting the special hoist with the lifting point of the hoist, first connect the special lifting anchor and steel strand to the hydraulic hoist of the lifting point, then weld the lifting lug directly to the lifted structure, and connect the lower hoist with the lifting lug through the pin. In addition, when installing the hydraulic hoist of super-large components, each hoist is required to be aligned with the center of the opening of the lifting beam; adjust the position according to the direction of the hydraulic lock; and fix the bottom of each hoist with a pressure plate.

[0054] S2, hoisting and trial lifting operation, adopts the method of double-point simultaneous lifting and synchronous graded loading to carry out the hoisting and trial lifting operation of the steel-concrete combined section.

[0055] In this step, the lifting test operation is carried out by lifting and loading the steel-concrete joint section at the same time with two points and loading in stages. Before the trial lifting, the combined gasket in the oil pipe joint is taken out, and there should be an O-ring on the corresponding pipe joint or butt joint; the low-position oil pipe is connected first to prevent the oil in the oil pipe from flowing back. The oil pipes between the pump station and the lifter should correspond to each other and be connected one by one;

[0056] The trial lifting operation of the steel-concrete joint section is carried out by adopting the method of dual-point simultaneous lifting and synchronous staged loading. During the trial lifting, the lifting equipment at each lifting point is loaded in stages until the entire steel-concrete joint section is off the ground.

[0057] It should be noted that the traditional lifting and graded loading method is usually more suitable for structures with single material properties, but it is not friendly to the mixed material structure of the steel-concrete joint section of the civil structure. Structural damage such as cracks is prone to occur at the joints of the mixed materials. By adopting the improved graded loading mechanism proposed in this application, the smooth and complete lifting of the steel-concrete joint section of the civil structure can be effectively guaranteed.

[0058] S3, the formal lifting operation, is carried out through the lifting machinery and control system to carry out the formal lifting operation of the steel-concrete joint section. After the steel-concrete joint section is lifted to the designed elevation position, it is temporarily locked and fine-tuned to meet the design standards.

[0059] In this step, the formal lifting operation is carried out by lifting mechanical equipment and control system to carry out the formal lifting operation of the steel-concrete combination section. After the steel-concrete combination section is lifted to the designed elevation position, it is temporarily locked and fine-tuned to meet the design standards. The control system involves a new structural attitude adjustment algorithm, which is characterized in that the existing structural attitude adjustment algorithm has a large single adjustment range and is difficult to adapt to working conditions with high requirements for the attitude adjustment accuracy of mixed material structures. By adopting the proposed new structural attitude adjustment algorithm, higher-precision aerial attitude adjustment can be achieved for the steel-concrete combination section of the civil structure.

[0060] S4, the final posture of the steel-concrete joint section is locked, high-strength bolts are tightened, welding and fixing operations are carried out on the interfaces at both ends of the steel-concrete joint section, the section is unloaded in stages, and the mechanical equipment and temporary measures related to the lifting operation are removed. The lifting operation of the entire steel-concrete joint section is completed.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A refined hoisting control method for a steel-concrete joint section of a civil engineering structure, characterized in that: include: Under the preset working conditions, the steel-concrete structure section is hoisted and lifted according to the improved graded loading mechanism, wherein the expression of the improved graded loading mechanism is: In the formula, p(t) is the control deviation, a(t) is the set value, c(t) is the actual output value, y(t) is the control output, and Z I is the proportionality coefficient, J T is the integral time constant, K is the motor speed, S is the displacement corresponding to the target level of loading and unloading, D is the number of movable pulleys, d is the reduction ratio of the reducer, r is the drum radius, T is the single-stage loading and unloading time, n is the number of loading levels, K(h) is the real-time output speed of the motor at the hth time, K(h-1) is the real-time output speed of the motor at the h-1th time, p(h) is the difference between the hth set pressure and the actual pressure, p(h-1) is the difference between the h-1th set pressure and the actual pressure, p(h-2) is the difference between the h-2th set pressure and the actual pressure, f(h) is the hth collected pressure, F(h) is the hth set pressure, Z J is the integration coefficient, Z W is the differential coefficient, f m is the target tension, f is the actual tension; After the steel-concrete structure section is lifted to the designed elevation position, the steel-concrete structure is adjusted in the air according to a preset structural attitude adjustment algorithm; The adjusted steel-concrete structural section is posture-locked.

2. The refined hoisting control method of the steel-concrete joint section of a civil engineering structure according to claim 1 is characterized in that: The expression of the preset structural posture adjustment algorithm is: Where L is the total length of the steel-concrete joint section, M is the moment of the steel-concrete joint section’s deadweight on the leftmost lifting point, is the bulk density, S is the cross-sectional area of ​​the steel-concrete joint section, h′ is the height of the hanging point from the steel-concrete joint section, m is the mass of the steel-concrete joint section, is the lifting coefficient, k is the deadweight coefficient, F is the other load acting on the steel-concrete joint section, X is the horizontal distance from the other load action point to the center point of the steel-concrete joint section, and f y is the vertical force acting on the steel-concrete joint section, f x is the horizontal force acting on the steel-concrete joint section, θ is the vertical angle between the sling and the action point of the steel-concrete joint section, T is the control force, d L For integral operation.

3. The refined hoisting control method of the steel-concrete joint section of a civil engineering structure according to claim 1 is characterized in that: After the adjusted steel-concrete structural section is posture-locked, the method further comprises: After the interfaces at both ends of the steel-concrete combined section are welded and fixed, the steel-concrete structural section is hoisted and dismantled according to a graded disassembly mechanism, wherein the graded disassembly mechanism is the reverse process of the improved graded loading mechanism.

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