A prefabricated composite floor slab installation process

Abstract

This application relates to an installation process for prefabricated composite floor slabs, specifically within the technical field of prefabricated composite floor slabs. The installation process includes: S1, hoisting preparation; S2, hoisting the composite floor slabs one by one, starting with the narrowest edge slabs and then moving to the remaining slabs; S3, pre-positioning and initial adjustment; S4, phased force balance control; and S5, after the composite floor slabs are in place, lowering them to the target installation position, checking the flatness of the slab installation, and sealing any gaps at the supports. Before hoisting, this application uses tension adjustment steel ropes to detect tension difference, verticality, and horizontality, and makes adjustments accordingly. This establishes a good initial condition for subsequent hoisting. Verticality is ensured by setting the adjustment steel ropes vertically downwards, simultaneously improving construction efficiency, stability, and safety.

Description

Technical Field

[0001] This application relates to the technical field of prefabricated composite floor slabs, and in particular to an installation process for prefabricated composite floor slabs. Background Technology

[0002] Prefabricated composite floor slabs are assembled monolithic floor slabs made of precast base slabs and cast-in-place concrete composite layers. The precast base slab is not only a component of the floor slab structure, but also serves as a permanent formwork for the cast-in-place composite layer. This can save formwork, speed up construction, and facilitate the finishing layer decoration. It has been widely used in high-rise buildings and large-span buildings with high requirements for overall rigidity.

[0003] In the construction of prefabricated composite floor slabs, hoisting is a crucial step that determines construction quality and safety. The precast base slab of composite floor slabs is usually relatively thin (e.g., 35mm-40mm thick) and contains internal steel trusses. If the stress on each hoisting point is uneven or the floor slab posture is not properly controlled during hoisting, quality problems such as cracking of the base slab, deformation of the truss reinforcement, and damage to the interface between the precast base slab and the composite layer are very likely to occur. At the same time, composite floor slabs are usually 2m-3m wide and several meters long, with high overall rigidity and their self-weight distribution is sensitive to the position of the hoisting points, which places high demands on the synchronization of multiple hoisting points and the stability of posture during the hoisting process.

[0004] Currently, the conventional approach in existing technologies is to use a crane for lifting combined with manual adjustment. This approach uses a tower crane or truck crane as the power source, directly connecting the pre-embedded lifting points (or the upper chord reinforcement of the truss) on the precast base slab via steel wire ropes and hooks. The slab's posture is adjusted manually using visual inspection and simple tools (such as hand-operated hoists and crowbars). While this approach is low-cost and uses simple equipment, it is difficult to achieve balanced force application during the lifting and hoisting of the composite slabs, resulting in low construction efficiency, stability, and safety. Therefore, achieving balanced force application on the composite slabs throughout the lifting and transport process to improve construction efficiency, stability, and safety is a pressing technical problem that needs to be solved. Summary of the Invention

[0005] In order to achieve force balance during the lifting and transportation of composite floor slabs, and to simultaneously improve construction efficiency, stability and safety, this application provides a prefabricated composite floor slab installation process.

[0006] This application provides a prefabricated composite floor slab installation process, which adopts the following technical solution: An installation process for prefabricated composite floor slabs includes the following steps: S1, hoisting preparation; S2, lift the composite floor slabs one by one in the order of first the narrow edge slabs and then the remaining slabs; S3, Pre-positioning and initial adjustment: Before lifting each composite floor slab, the lifting device drives multiple hooks connected to the adjusting steel rope to visually align with multiple lifting points. The lifting device adjusts the position of multiple hooks to further align them with the multiple lifting points. The multiple hooks are connected to the multiple lifting points, and the adjusting steel rope is moved to make it tensioned. This is used to monitor the tension difference, verticality, and horizontality of the adjusting steel rope connected to each hook, and to make adjustments until the preset requirements are met. S4, phased force balance control: When lifting the composite floor slab, the position of the lifting points is adjusted in the first stage at the beginning of the lifting process to make the force of each lifting point balanced, and the position of the lifting points is adjusted in the second stage during the subsequent lifting process to dynamically maintain the force balance of each lifting point. S5. After the composite floor slab is in place, it is lowered to the target installation position. After it is in place, the flatness of the floor slab is checked, and the gaps at the support are sealed.

[0007] By adopting the above technical solutions, this installation process achieves high-efficiency, high-stability, and high-safety hoisting and installation of composite floor slabs through four major stages: "optimization of hoisting sequence + initial adjustment of pre-positioning + phased force balance control + quality control of placement".

[0008] Optimize the hoisting sequence: Prepare for hoisting before construction. Hoist the composite floor slabs one by one in the order of the narrow edge slabs first, followed by the remaining slabs. The narrow edge slabs are usually located at the boundary of the floor slab laying area. They are narrower and lighter. Hoisting them first facilitates the positioning and adjustment of the subsequent slabs and avoids the unfavorable stress state of "point support".

[0009] Pre-positioning and initial adjustment: Before lifting each composite floor slab, the lifting device drives and adjusts the positions of multiple hooks connected to the steel ropes to visually align with multiple lifting points. The lifting device then adjusts the positions of the multiple hooks to further align them with the lifting points, and the hooks are then connected to the lifting points. The movement of multiple adjusting steel ropes drives the hooks to move upward, thus tensioning the adjusting steel ropes. This tension difference, verticality, and levelness of the adjusting steel ropes connected to each hook are then monitored.

[0010] First, adjust the tension difference and levelness. If the tension difference of multiple hooks deviates from the target value, adjust the position of the hooks in the lifting device to bring the tension difference to a preset threshold, so that the tension of multiple adjusting steel ropes at various positions tends to be consistent. At the same time, adjust the position of each hook according to the levelness of the lifting device to make the tension difference and levelness of the lifting device meet the requirements. Then, adjust the verticality of the adjusting steel rope to keep it vertically downward. Continue to adjust until the preset threshold is met. Before lifting, ensure that the tension of the adjusting steel rope is balanced at each hook and that the verticality and levelness of the lifting device meet the requirements, thus establishing a good initial state for subsequent lifting.

[0011] Phased force balance control: After lifting the stacked floor slabs, the first stage of position adjustment is carried out on the lifting points in the initial stage of lifting to ensure that the force on each lifting point is balanced. In the initial stage of lifting, the floor slabs have not yet completely left the ground, and the uneven force on each lifting point is the most serious. At this time, coarse adjustment is carried out. In the subsequent lifting process, the second stage of position adjustment is carried out on the lifting points to dynamically maintain the force balance on each lifting point. During the lifting process, due to disturbances such as wind force and inertial force, fine adjustment is required to compensate for the force deviation in real time.

[0012] Positioning and Quality Control: After the composite floor slab is in place, it is lowered to the target installation position. After positioning, the flatness of the floor slab is checked. A level or straightedge is used to check the flatness of the floor slab surface and the height difference between adjacent slabs. Gaps at the supports are sealed and filled with special mortar or grouting material.

[0013] First, the narrow edge plates are hoisted to avoid point support during subsequent plate hoisting, thus improving construction safety. Before hoisting, the tension adjustment steel rope is used to check the tension difference, verticality, and horizontality and make adjustments accordingly. Compared to the adjustments during the hoisting process, this requires the least amount of force, is faster, and has better results, establishing a good initial condition for subsequent hoisting. Moreover, the verticality adjustment steel rope can be set vertically downward, which can further improve the stability during the hoisting process, thereby improving construction efficiency, stability, and safety simultaneously.

[0014] Meanwhile, the first stage of coarse adjustment (initial lifting) and the second stage of fine adjustment (lifting process) are graded and controlled to balance adjustment efficiency and final accuracy. The second stage compensates for force deviations caused by wind force, inertial force, etc. in real time to ensure force balance throughout the lifting process. This is to achieve force balance during the lifting and transportation of composite floor slabs, thereby improving construction efficiency, stability and safety.

[0015] Optionally, the hoisting device includes multiple sets of hoisting mechanisms spaced apart on the main lifting beam, each hoisting mechanism comprising: The auxiliary lifting beam is slidably mounted on the main lifting beam. The movable component, located on the main lifting beam, is used to drive the movement of the auxiliary lifting beam; Two adjusting seats are slidably mounted on the auxiliary lifting beam, with the sliding direction parallel to the moving direction of the auxiliary lifting beam. Both seats are equipped with pulley blocks. An adjustment assembly is used to drive two adjustment seats closer together or further apart; A winding assembly is installed on the auxiliary lifting beam and is used to wind up or unwind the adjusting steel rope. The two ends of the adjusting steel rope pass over pulley blocks located on two adjusting seats and are connected to the hook. The monitoring component is used to monitor in real time the tension difference, verticality, and horizontality of the adjusting steel ropes connected to the two hooks. The adjusting component and the moving component are both electrically connected to the monitoring component to form a closed-loop feedback circuit. The adjusting component outputs adjustment commands to the adjusting component and the moving component based on the tension difference between the two adjusting steel ropes, the verticality, and the horizontal deviation of the main lifting beam.

[0016] By adopting the above technical solution, the auxiliary lifting beam can slide laterally along the main lifting beam, changing the position of the pulley block. The adjusting component is used to drive the two adjusting seats to move closer or further apart—achieving adjustment of the pulley block spacing to accommodate composite floor slabs of different sizes. The moving component is used to drive the auxiliary lifting beam to move—the auxiliary lifting beam can move on the main lifting beam, causing the two adjusting components, the winding component, and the pulley block to move simultaneously; the winding component is set on the auxiliary lifting beam and is used to wind up or unwind the adjusting steel rope. The two ends of the adjusting steel rope pass over the pulley blocks located on the two adjusting seats, and the hook is connected to both ends of the adjusting steel rope—forming a steel rope path of "winding reel → pulley block → hook".

[0017] Multiple hooks are connected to multiple lifting points. A winding assembly winds up the adjusting steel rope to tension it. A monitoring assembly is used to detect in real time the tension difference, verticality, and horizontality of the adjusting steel rope passing through two pulley blocks. The adjusting assembly and moving parts are electrically connected to the monitoring assembly to form a closed-loop feedback loop. Based on the tension difference, verticality, and horizontality deviation of the main lifting beam, the monitoring assembly outputs adjustment commands to the adjusting assembly and moving parts. After the monitoring assembly detects the tension difference and verticality or horizontality deviation, the control system automatically calculates the required adjustment amount, drives the adjusting assembly to adjust the spacing between the adjusting seats, and / or the moving parts to adjust the position of the auxiliary lifting beam until the deviation is eliminated.

[0018] The adjustment component simultaneously drives the two adjustment seats to move closer or further apart, while the moving component drives the auxiliary lifting beam and the two adjustment seats to move in the same direction. The monitoring component provides real-time feedback on the tension difference of the adjustment steel rope and the levelness of the main lifting beam, ensuring that the levelness of the main lifting beam and the deviation of the tension of the adjustment steel rope at each hook are within a specified threshold. Then, the adjustment component drives the two adjustment seats to move closer or further apart, and the monitoring component detects the verticality of the adjustment steel rope in real time until the verticality of the adjustment steel rope is within a specified threshold. This achieves force balance at each lifting point, ensures the lifting device is in a horizontal state, and keeps the adjustment steel rope in a vertical state. Furthermore, through multiple adjustment mechanisms, multi-point and multi-location adjustments are achieved, further improving adjustment efficiency and quality, and enhancing construction efficiency and stability.

[0019] Bidirectional adjustable lifting point position: The two adjusting seats can move closer or further apart, and the auxiliary lifting beam drives the two adjusting seats to move in the same direction, achieving precise adjustment of multiple hook positions; Precise control of steel rope length: The winding assembly can wind up or unwind the adjusting steel rope to precisely control the hook height; Closed-loop real-time feedback control: The monitoring assembly provides real-time feedback of tension difference, verticality, and horizontality signals, forming a closed-loop control circuit, automatically outputting adjustment commands to achieve automatic adjustment of force balance, while improving construction efficiency, stability, and safety.

[0020] Optionally, the adjustment component includes: The adjusting screw is rotatably mounted on the main lifting beam and has two threaded sections with opposite helical lines that are threadedly connected to the two adjusting seats. An adjusting component is located on the auxiliary lifting beam and is used to drive the adjusting screw to rotate; A turntable is located on the end of the adjusting screw furthest from the adjusting element and is used to manually drive the adjusting screw to rotate.

[0021] By adopting the above technical solution, when adjustment is required, the adjusting component or turntable drives the adjusting screw to rotate. Because the two threads rotate in opposite directions, the two adjusting seats move synchronously towards each other (closer to each other) or away from each other (farther from each other) along the axis of the adjusting screw. The two adjusting seats move in equal amounts and in opposite directions, ensuring that the pulley block is always symmetrical about the center of the main lifting beam, resulting in faster adjustment efficiency and better adjustment effect.

[0022] The adjusting mechanism is electrically driven, while the turntable is manually driven as a backup, adapting to different working conditions. The threaded drive has a self-locking characteristic, ensuring stable position after adjustment, while improving construction efficiency, stability, and safety.

[0023] Optionally, the winding assembly includes: A winding reel is rotatably mounted on the auxiliary lifting beam via a rotating shaft, and the adjusting steel rope is wound onto the winding reel. A rotating component is located on the auxiliary lifting beam and is used to drive the rotating shaft to rotate; Locking element, used to lock the reel.

[0024] By adopting the above technical solution, when winding is required, the locking component unlocks, the rotating component maintains its position, the rotating component starts to drive the shaft and winding reel to rotate and adjust the steel rope. After adjustment, the rotating component and the locking component lock the winding reel together. When unwinding is required, the locking component unlocks, and the rotating component rotates in the opposite direction. After adjustment, the winding reel is still locked by the rotating component and the locking component together.

[0025] Precise control of steel rope length: The rotating component drives the winding reel to rotate, precisely controlling and adjusting the release length of the steel rope; Anti-loosening locking: After adjustment, the locking component works with the rotating component to lock the winding reel, preventing the steel rope from accidentally loosening.

[0026] Optionally, the locking component includes locking teeth and a locking disc. The locking teeth are coaxially disposed on the rotating shaft, and the locking disc is slidably disposed on the auxiliary lifting beam and is positioned by inserting and engaging with the locking teeth.

[0027] By adopting the above technical solution, the locking disc moves and disengages from the locking teeth to achieve unlocking. When locking is required, the locking disc moves back and engages with the locking teeth to enable the rotating parts to jointly position the adjusting steel rope.

[0028] Optionally, the monitoring component includes: Multiple sets of testing components are installed on the auxiliary lifting beam and are used to test the tension and verticality of the adjusting steel rope. Each testing component includes a testing rod and a testing instrument. The testing rod is slidably installed on the auxiliary lifting beam along the direction close to or away from the adjusting steel rope and is connected to the auxiliary lifting beam through an elastic element. A guide roller is rotatably installed at the end close to the adjusting steel rope. The testing instrument is installed on the auxiliary lifting beam. The adjusting steel rope passes around the guide roller and pushes the testing rod against the testing instrument to detect the tension. A level is installed on the auxiliary lifting beam and is used to detect the levelness of the auxiliary lifting beam. The adjustment component, moving component, detection component and level are all electrically connected to the control unit to form a closed-loop feedback loop.

[0029] By adopting the above technical solution, the adjusting steel rope is wound around the guide roller, and the winding assembly winds up the adjusting steel rope. The adjusting steel rope pulls the guide roller and pushes the detection rod close to the detector. The detector (such as a pressure sensor) detects the force on the detection rod, thereby indirectly measuring the tension difference between the two adjusting steel ropes. When detecting the verticality of the adjusting steel rope, at least two vertically set detectors are used to detect the pressure of the adjusting steel rope. The verticality of the adjusting steel rope is judged based on the pressure difference detected by the two detectors, realizing real-time monitoring of the tension and verticality of the adjusting steel rope. This makes the tension and verticality of the adjusting steel rope at multiple locations tend to be consistent. The level instrument monitors the levelness of the auxiliary lifting beam in real time and is used to display the levelness of the main lifting beam, ensuring that the lifting device remains level, while improving construction efficiency, stability and safety.

[0030] Optionally, the first stage of position adjustment specifically includes: The hoisting device lifts the stacked floor slabs to a first height H above the ground at a first speed V. The real-time pressure value P of each hoisting point is collected by multiple sets of monitoring components at a first sampling frequency F. The deviation ΔP = |P-Pavg| between the pressure at each hoisting point and the average pressure Pavg is calculated. If any ΔP exceeds the first threshold T, the adjustment component and / or moving part are activated to adjust the position until all ΔP converges to within the first threshold T.

[0031] By adopting the above technical solution, the first stage of position adjustment is carried out at the initial stage of lifting. The lifting device lifts the stacked floor slabs to a first height H above the ground at a first speed V. The real-time pressure value P of each lifting point is collected by monitoring components installed at various locations at a first sampling frequency F. The deviation ΔP = |P - Pavg| between the pressure at each lifting point and the average pressure Pavg is calculated. If any ΔP exceeds a first threshold T, the adjustment component and / or moving parts are activated to perform position adjustment until all ΔP converges to within the first threshold T.

[0032] Low-speed lifting: The initial speed V is relatively low to ensure a smooth lifting process; Ground clearance detection: Stress detection is performed at the first height H above the ground, at which point the floor slab has completely detached from the support; Coarse adjustment convergence: The first threshold T is relatively large to quickly complete the initial stress balance, taking into account both construction efficiency and stability, and improving construction efficiency, stability and safety at the same time.

[0033] Optionally, the second stage position adjustment specifically includes: The hoisting device lifts the composite floor slab to the target installation position at a second speed v. During the entire hoisting process, the real-time pressure value P(g) of each hoisting point is continuously collected at a second sampling frequency f. The real-time deviation ΔP(g) is calculated. If ΔP(g) exceeds the second threshold t, the adjustment component and / or moving part are activated to adjust the position until ΔP(g) converges to within the second threshold t; where t < T.

[0034] By adopting the above technical solution, the second-stage position adjustment is carried out throughout the hoisting process. The hoisting device hoists the composite floor slab to the target installation position at a second speed v. During the hoisting process, the real-time pressure value P(g) of each hoisting point is continuously collected at a second sampling frequency f, and the real-time deviation ΔP(g) is calculated. If ΔP(g) exceeds the second threshold t, the adjustment component and / or moving part are activated to perform position adjustment until ΔP(g) converges to within the second threshold t, where t < T.

[0035] Fine-tuning ensures high precision: The second threshold is relatively small (3%~5%), ensuring balanced force on all lifting points throughout the hoisting process; Real-time compensation for external disturbances: High-frequency sampling (≥10Hz) + rapid response adjustment, real-time compensation for disturbances such as wind force and inertial force; Throughout the entire hoisting process: Continuous adjustment from the completion of hoisting to the placement stage ensures balanced force throughout the process; Combination of coarse and fine adjustments: Large T and small t, rapid coarse adjustment and precise fine adjustment; Balancing efficiency and accuracy: Avoiding efficiency reduction caused by high-precision adjustment throughout the process, further improving construction efficiency, stability and safety simultaneously.

[0036] Optionally, the first threshold T is 8% to 12% of the average pressure Pavg, and the second threshold t is 3% to 5% of the average pressure Pavg.

[0037] By adopting the above technical solution, the first threshold T is 8% to 12% of the average pressure Pavg—allowing for a relatively large deviation range in the first stage of coarse adjustment, thus quickly completing the initial balancing. The second threshold t is 3% to 5% of the average pressure Pavg—requiring higher balancing accuracy in the second stage of fine adjustment.

[0038] Graded control optimizes efficiency: coarse adjustment (8%~12%) reduces the number of adjustments, fine adjustment (3%~5%) ensures final accuracy; the numerical range has been optimized and verified: the threshold ranges of 8%~12% and 3%~5% take into account both adjustment efficiency and force balance accuracy, further improving construction efficiency, stability and safety at the same time.

[0039] Optionally, the first sampling frequency F is not less than 5Hz, the second sampling frequency f is not less than 10Hz, the first sampling frequency F is less than the second sampling frequency f, the first height H is 300mm~500mm, and the first speed V is less than the second speed v.

[0040] By adopting the above technical solution, the first sampling frequency F is less than the second sampling frequency f, F ≥ 5Hz, f ≥ 10Hz—the sampling frequency in the first stage is relatively low (≥ 5Hz), and the sampling frequency in the second stage is relatively high (≥ 10Hz). The first height is 300mm~500mm—the first stage adjustment is completed when the floor slab is 300~500mm from the ground. The first speed V is less than the second speed v—the lifting speed is slow, and the hoisting speed is fast.

[0041] Graded sampling frequency optimization: The first stage of 5Hz meets the coarse adjustment requirements, and the second stage of 10Hz meets the high-frequency acquisition requirements for fine adjustment; The first height is safe and reasonable: 300mm~500mm ensures that the floor slab is completely lifted off the ground, but does not increase the risk by being too high; Graded speed optimization for efficiency: Low-speed lifting ensures adjustment accuracy, while improving construction efficiency, stability and safety.

[0042] In summary, this application includes at least one of the following beneficial technical effects: 1. Before lifting, the tension adjustment steel rope is used to check the tension difference, verticality, and horizontality, and adjustments are made accordingly. Compared to adjusting after lifting, this requires the least amount of force, is faster, and has a better effect, establishing a good initial state for subsequent lifting. Moreover, the verticality can be ensured by setting the adjustment steel rope vertically downward, which can further improve the stability during the lifting process, thereby improving construction efficiency, stability, and safety at the same time.

[0043] 2. Through the graded control of the first stage coarse adjustment (initial lifting) and the second stage fine adjustment (lifting process), both adjustment efficiency and final accuracy are taken into account; the second stage compensates for the force deviation caused by wind force, inertial force, etc. in real time to ensure the force balance throughout the lifting process. In order to achieve the force balance during the lifting and transportation of composite floor slabs, it is used to improve construction efficiency, stability and safety.

[0044] 3. By moving the two adjusting seats closer together or further apart, and with the auxiliary lifting beam driving the two adjusting seats to move in the same direction, precise adjustment of multiple hook positions can be achieved; precise control of steel rope length: the winding assembly can wind up or unwind the adjusting steel rope to precisely control the hook height; closed-loop real-time feedback control: the monitoring assembly provides real-time feedback of tension difference, verticality, and horizontality signals, forming a closed-loop control loop, automatically outputting adjustment commands to achieve automatic adjustment of force balance, while improving construction efficiency, stability, and safety. Attached Figure Description

[0045] Figure 1 It is a process flow diagram of the installation process; Figure 2 It is a three-dimensional structural diagram of the hoisting device, main lifting beam, adjusting steel rope and hook in the installation process; Figure 3 It is a three-dimensional structural diagram of the hoisting mechanism, main hoisting beam, adjusting steel rope and hook in the installation process; Figure 4 It is a three-dimensional structural diagram of the adjustment components, winding components, monitoring components, adjustment steel rope and hook in the installation process; Figure 5 This is a structural schematic diagram of the winding assembly in the installation process, in which the mounting plate is shown in cross section; Figure 6 This is a structural diagram of the pulley block and monitoring components in the installation process.

[0046] Reference numerals: 11. Lifting ring; 12. Main lifting beam; 13. Adjusting steel rope; 14. Lifting hook; 15. Inspection section one; 16. Inspection section two; 17. Rotating shaft; 2. Lifting device; 21. Sliding column; 22. Pulley block; 23. Pulley body; 24. Limiting groove; 3. Lifting mechanism; 31. Auxiliary lifting beam; 32. Moving part; 33. Adjusting seat; 4. Adjusting assembly; 41. Adjusting screw; 42. Adjusting part; 43. Turntable; 5. Rewinding assembly; 51. Rewinding reel; 52. Rotating part; 53. Locking part; 54. Mounting seat; 55. Locking tooth; 56. Locking disc; 57. Locking groove; 58. Moving part; 59. Mounting plate; 6. Monitoring assembly; 61. Inspection part; 62. Level; 63. Inspection rod; 64. Inspection instrument; 65. Elastic part; 66. Guide roller; 67. Guide column. Detailed Implementation

[0047] The following provides a further detailed description of this application.

[0048] This application discloses an installation process for prefabricated composite floor slabs.

[0049] Reference Figures 1-3 The installation process for prefabricated composite floor slabs includes the following steps: S1, Lifting Preparation: Before construction, inspect the appearance quality, dimensional deviations, embedded parts, and reserved holes of the composite floor slab to ensure that they meet the design requirements and relevant standards. All lifting points of the composite floor slab are pre-embedded with threaded pipes, and multiple lifting rings are threadedly connected to these pipes for positioning.

[0050] S2. Following the order of the narrow edge slabs first, followed by the remaining slabs, lift the composite floor slabs one by one. According to construction specifications, it is advisable to lift and lay the narrow edge slabs first to avoid point support. The narrow edge slabs are usually located at the boundary of the floor slab laying area; they are narrower and lighter, so lifting them first facilitates the positioning and adjustment of subsequent slabs. After the narrow edge slabs are in place, lift the remaining slabs in sequence.

[0051] S3, Pre-positioning and initial adjustment: The lifting device 2 is connected to the crane. The lifting device 2 is equipped with multiple hooks 14 connected to the adjusting steel rope 13. The crane drives the lifting device 2 to move so that the multiple hooks 14 are visually aligned with the multiple lifting points (lifting rings 11) (i.e., aligned by visual inspection). The lifting device 2 adjusts the position of the multiple hooks 14 so that the multiple hooks 14 are further aligned with the multiple lifting points.

[0052] Multiple hooks 14 are connected to multiple lifting rings 11, thus connecting the hooks 14 to the lifting points. Adjusting the steel rope 13 moves and pulls the multiple hooks 14 upwards, causing the steel rope 13 to become taut. The tension and verticality of the steel rope 13 connected to each hook 14, as well as the levelness of the lifting device 2, are detected and adjusted until preset requirements are met. When the difference in tension at each location exceeds a specified threshold, the lifting device 2 starts adjusting the position of each hook 14, making the tension at each location more uniform, i.e., the difference in tension at each location is less than the specified threshold. Simultaneously, based on the levelness detection, the position of each hook 14 is adjusted so that the levelness of the lifting device 2 is at the required threshold, i.e., in a balanced state. After adjustment, the position of each hook 14 is adjusted again based on the verticality detection of the steel rope 13, so that the verticality of the portion of the steel rope 13 connected to the hook 14 meets the required requirements, i.e., it is in a vertically downward state, thus meeting the preset threshold requirements.

[0053] The crane is detachably connected to a main lifting beam 12, which is a cubic or cuboid frame structure. The following explanation uses a cuboid main lifting beam 12 as an example. The lifting device 2 includes multiple lifting mechanisms 3, spaced apart along the width of the main lifting beam 12. Multiple adjusting steel cables 13 are provided and connected to the corresponding lifting mechanisms 3. Two hooks 14 are provided and connected to both ends of the adjusting steel cables 13. Each lifting mechanism 3 can independently adjust the positions of the two hooks 14.

[0054] Reference Figures 1-6The hoisting mechanism 3 includes an auxiliary lifting beam 31, a moving part 32, two adjusting seats 33, an adjusting assembly 4, a winding assembly 5, and a monitoring assembly 6. The auxiliary lifting beam 31 and the main lifting beam 12 are parallel in length. The auxiliary lifting beam 31 is slidably mounted on the lower surface of the main lifting beam 12 along its length. The moving part 32 is a hydraulic cylinder or an electric actuator. The moving part 32 is fixedly mounted on the main lifting beam 12, and its piston rod is connected to the auxiliary lifting beam 31 and used to drive the auxiliary lifting beam 31 to move. The two adjusting seats 33 are slidably disposed at both ends of the auxiliary lifting beam 31, and the sliding direction is along the length of the main lifting beam 12. Each adjusting seat 33 is provided with a pulley block 22 to guide the adjusting steel rope 13.

[0055] Adjustment assembly 4 is used to drive the two adjustment seats 33 to move closer or further apart. Rewinding assembly 5 is located at the middle of the length of the auxiliary lifting beam 31, between the two adjustment seats 33. Adjustment steel rope 13 is wound onto rewinding assembly 5, with both ends passing through pulley blocks 22 on the two adjustment seats 33 and then vertically downwards. Two hooks 14 are connected to both ends of the adjustment steel rope 13. The adjustment steel rope 13 located between the two pulley blocks 22 and rewinding assembly 5 forms two detection sections 15, through which… The adjusting steel rope 13 connected to the hook 14 after the two pulley blocks 22 forms two detection sections 16; the monitoring component 6 is used to detect the tension of the two detection sections 15, the verticality of the two detection sections 16, and the horizontality of the auxiliary lifting beam 31 and the main lifting beam 12 (the entire lifting device 2). The adjusting component 4 and the moving part 32 are electrically connected to the monitoring component 6 to form a closed-loop feedback circuit, and output adjustment commands to the adjusting component 4 and the moving part 32 according to the difference in tension at the two locations, the verticality, and the horizontality deviation of the main lifting beam 12.

[0056] The adjusting assembly 4 includes an adjusting screw 41, an adjusting element 42, and a turntable 43. The adjusting screw 41 is rotatably mounted on the auxiliary lifting beam 31, and the lengths of the adjusting screw 41 and the auxiliary lifting beam 31 are parallel. The adjusting screw 41 has a threaded section with opposite helical lines at both ends, which is threadedly connected to two adjusting seats 33. The adjusting element 42 is a motor and is electrically connected to the control unit. The control unit is electrically connected to the monitoring assembly 6 and receives detection data. Based on the detection data, the control unit controls the starting and operating parameters of the adjusting element 42. The adjusting element 42 is mounted on the auxiliary lifting beam 31, and its output shaft is connected to one end of the adjusting screw 41 to drive the adjusting screw 41 to rotate. The turntable 43 is coaxially mounted on the end of the adjusting screw 41 away from the adjusting element 42 and is used to manually drive the adjusting screw 41 to rotate.

[0057] Preferably, the control unit controls the adjusting component 42 to drive the adjusting screw 41 to rotate, driving the two adjusting seats 33 to move closer or further apart, thereby adjusting the distance between the two pulley groups 22 and the two hooks 14 to accommodate composite floor slabs of different sizes; when the adjusting component 42 is damaged or there is a power outage, the adjusting screw 41 is driven to rotate by the turntable 43.

[0058] The pulley block 22 includes at least two pulley bodies 23 rotatably mounted on the adjusting seat 33. The two pulley bodies 23 are spaced apart along the length of the auxiliary lifting beam 31, and each has a limiting groove 24 coaxially provided to guide the adjusting steel rope 13. The adjusting steel rope 13 passes through the two limiting grooves 24 to guide and limit the adjusting steel rope 13.

[0059] The winding assembly 5 includes a winding reel 51, a rotating component 52, and a locking component 53. A mounting base 54 is fixedly installed at the middle position of the auxiliary lifting beam 31 along its length. The mounting base 54 is located between two adjusting seats 33. The winding reel 51 is rotatably mounted on the mounting base 54 via a rotating shaft 17. The distance between the winding reel 51 and the two pulley blocks 22 is the same. The adjusting steel rope 13 is wound on the winding reel 51. The axes of the winding reel 51 and the rotating shaft 17 are horizontal and perpendicular to the length direction of the auxiliary lifting beam 31.

[0060] The rotating component 52 is a motor, fixedly mounted on the mounting base 54, and its output shaft is connected to the rotating shaft 17 to drive the rotating shaft 17 to rotate. The locking component 53 is used to lock the take-up reel 51, and the locking component 53 includes locking teeth 55 and locking discs 56. A mounting plate 59 is fixedly mounted on the end of the mounting base 54 away from the rotating component 52, and the rotating shaft 17 is rotatably mounted on the mounting plate 59. The locking teeth 55 are coaxially arranged on the end of the rotating shaft 17 away from the rotating component 52, and are spaced apart around the rotating shaft 17.

[0061] The locking disc 56 is located between the mounting plate 59 and the mounting base 54, and is slidably mounted on the mounting plate 59 along the axis of the rotating shaft 17, thus restricting the rotation of the locking disc 56. The locking disc 56 has multiple locking grooves 57 arranged in a circular array around the axis of the rotating shaft 17, which are engaged with the locking teeth 55 for positioning. A movable part 58 is fixedly mounted on the side wall of the mounting plate 59. The movable part 58 is a hydraulic cylinder or an electric push rod. The piston rod of the movable part 58 is connected to the locking disc 56 and is used to drive the locking disc 56 to move.

[0062] After the winding reel 51 has finished winding the adjusting steel rope 13, the rotating part 52 first locks the position of the rotating shaft 17 and the locking tooth 55. The movable part 58 drives the locking disc 56 to approach the locking tooth 55, and makes the locking tooth 55 insert and install on the locking groove 57 for positioning. When the winding reel 51 needs to rotate, the movable part 58 drives the locking disc 56 to disengage from the locking tooth 55.

[0063] The monitoring component 6 includes multiple sets of detection elements 61 and a level 62. The multiple sets of detection elements 64 are electrically connected to the control unit and are used to transmit the detection data to the control unit for processing. At least two detection elements 61 are located below the two detection sections 15 respectively and are vertically upward and abut against the detection sections 15. They are used to detect the tension of the two adjusting steel ropes 13, thereby obtaining the difference in tension between the two adjusting steel ropes 13.

[0064] At the same time, at least two detection elements 61 are set at each of the two detection sections 2 16. The two detection elements 61 are set vertically at intervals and horizontally abut against the detection section 2 16. The verticality of the adjustment steel rope 13 is determined based on the pressure value detected by the two detection elements 61. The following explanation will take the detection element 61 located at the detection section 1 15 as an example.

[0065] The detection component 61 includes a detection rod 63 and a detector 64. The detection rod 63 is vertically slidably mounted on the adjusting seat 33, meaning it moves towards or away from the adjusting steel rope 13. A vertically upward guide post 67 is fixedly installed on the adjusting seat 33 below the detection rod 63. An elastic element 65, which can be a spring, is fixedly installed at the bottom of the detection rod 63 and is fixedly connected to the adjusting seat 33. The elastic element 65 is fitted onto the guide post 67 for positioning. A guide roller 66 is rotatably mounted on the end of the detection rod 63 near the adjusting steel rope 13. The detector 64 is fixedly mounted on the guide post 67 and can... As a pressure sensor, the adjusting steel rope 13 passes around the guide roller 66 and pushes the detection rod 63 to press against the detection instrument 64 for positioning. The detection instrument 64 is used to detect the tension of the adjusting steel rope 13. The level 62 is fixedly installed on the auxiliary lifting beam 31 and is used to detect the levelness of the auxiliary lifting beam 31. By checking the levelness of multiple auxiliary lifting beams 31, the entire lifting device 2 tends to be balanced. The level 62 and multiple detection instruments 64 are all electrically connected to the control unit and realize the transmission of detection data to the control unit for processing, thereby obtaining the tension difference between the two points and whether the levelness of the main lifting beam 12 meets the preset threshold requirements.

[0066] The crane drives the lifting device 2 to move, so that the multiple hooks 14 are initially roughly aligned with the multiple lifting points. The adjusting component 42 then drives the two adjusting seats 33 to move, thereby adjusting the position of the two hooks 14 and further aligning the hooks 14 with the lifting points, achieving a second adjustment. The hooks 14 are connected to the lifting ring 11, and the rotating component 52 drives the winding reel 51 to rotate and wind up the adjusting steel rope 13, driving the two hooks 14 to move upward, so that the adjusting steel rope 13 is tensioned. According to the tension difference detected by the detectors 64 at various locations, if the difference is greater than a specified threshold, the adjusting component 42 and / or the moving component 32 work together to adjust the position of the two hooks 14, and monitor the tension difference in real time until the difference is less than or equal to the specified threshold. At the same time, according to the levelness detected by the level instrument 62, the position of the two hooks 14 is further adjusted so that the levelness reaches the preset threshold.

[0067] Based on the verticality of the adjusting steel rope 13 detected by the detector 64, if the verticality does not reach the preset threshold, the control unit controls the adjusting component 42 to start driving the two hooks 14 to move simultaneously, so that the verticality of the adjusting steel rope 13 at both points reaches the preset threshold, thereby achieving uniform tension of each adjusting steel rope 13, keeping the hoisting device 2 in a horizontal state, and keeping the detection section 16 of the adjusting steel rope 13 in a vertically downward state. This is one set of hoisting mechanism 3 adjustment methods. At the same time, multiple sets of hoisting mechanisms 3 are adjusted simultaneously, so that the multiple hooks 14 connected to multiple hoisting points are subjected to balanced forces, which can greatly improve construction efficiency, stability and safety.

[0068] S4, phased force balance control: When lifting the composite floor slab, the first stage of position adjustment is carried out on the lifting points in the initial stage of lifting to make the force on each lifting point balanced, and the second stage of position adjustment is carried out on the lifting points in the subsequent lifting process to dynamically maintain the force balance of each lifting point.

[0069] In the first stage of position adjustment, the hoisting device 2 lifts the composite floor slab to a first height H above the ground at a first speed V. The first height H is 300mm to 500mm. Multiple sets of detectors 64 collect the real-time pressure value P at each lifting point at a first sampling frequency F. The detectors 64 monitor the force on each lifting point in real time during the hoisting process. The deviation ΔP = |P - Pavg| between the pressure at each lifting point and the average pressure Pavg is calculated. If any ΔP exceeds a first threshold T, the lifting point adjustment components 4 and / or moving parts 32 are activated to adjust the position until all ΔP converges to within the first threshold T.

[0070] The first threshold T is 8% to 12% of the average pressure Pavg. The control objective of the first stage is coarse adjustment, allowing for a relatively large deviation range. When ΔP exceeds the first threshold T, the positions and spacing of multiple hooks 14 are adjusted by adjusting component 4 and / or moving part 32, so that ΔP converges to within the first threshold T.

[0071] As a preferred embodiment: In the first stage of position adjustment, the first speed is 0.05–0.10 m / s, and the first height is 300–500 mm. The first threshold T is preferably 10% of the average pressure Pavg. During the adjustment process, the position adjustment amount of each suspension point is determined proportionally based on the difference between ΔP and T, with an adjustment step size of 5–10 mm per adjustment.

[0072] In the second stage of position adjustment, the hoisting device 2 lifts the composite floor slab to the target installation position at a second speed v. The second speed v is greater than the first speed V. After the initial force balance adjustment is completed, a faster speed can be used during the hoisting process to improve efficiency. Throughout the hoisting process, the real-time pressure value P(g) of each hoisting point is continuously collected at a second sampling frequency f, and the real-time deviation ΔP(g) is calculated. If ΔP(g) exceeds the second threshold t, the corresponding hoisting point adjustment component 4 and / or moving part 32 perform real-time position compensation adjustment until ΔP(g) converges to within the second threshold t.

[0073] The second speed v is greater than the first speed V. A lower speed is used in the initial stage of lifting to facilitate precise control of the force balance at each lifting point. The first sampling frequency F is less than the second sampling frequency f, F≥5Hz, f≥10Hz. High-frequency sampling ensures real-time capture of force changes during lifting. The second threshold t is less than the first threshold T. The control objective of the second stage is fine-tuning, requiring higher force balance accuracy. The second threshold t is 3% to 5% of the average pressure Pavg.

[0074] As a preferred embodiment: In the second stage of position adjustment, the second velocity v is 0.15–0.30 m / s. The sampling frequency f is 20 Hz. The second threshold t is preferably 4% of the average pressure Pavg. During the adjustment process, the position compensation of each suspension point is continuously adjustable, and the adjustment response time is ≤0.5 s.

[0075] The second stage of position adjustment runs through the entire hoisting process, compensating in real time for force fluctuations at each hoisting point caused by factors such as wind changes, inertial forces, and vibrations of the hoisting device 2. When ΔP(g) exceeds the second threshold t, the positions and spacing of multiple hooks 14 are adjusted by adjusting the components 4 and / or the moving parts 32, so that ΔP(g) converges to within the second threshold t.

[0076] S5. After the composite floor slab is in place, lower it to the target installation position. After it is in place, check the flatness of the floor slab and seal the gaps at the supports.

[0077] Lowering and Positioning: Lower the composite floor slab to the target installation position. When the composite floor slab is approximately 1000mm from the installation position, hold it firmly by hand and lower it slowly. During positioning, the positioning clamps and gradual positioning columns match, allowing the composite floor slab to automatically adjust its position during placement.

[0078] Flatness check: After installation, check the flatness of the floor slab. Use a level or straightedge to check the flatness of the floor slab surface and the height difference between adjacent slabs to ensure that design requirements are met. Key indicators such as slab elevation and flatness of adjacent components should all meet the requirements.

[0079] Support gap sealing: The gaps at the supports are sealed. Special mortar or grouting material is used to fill and compact the gaps between the composite floor slab and the supports. After sealing, the quality of the sealing is checked to ensure there are no voids or cracks.

[0080] The working principle of this application embodiment is as follows: Lifting preparation: Lift the composite floor slabs one by one, starting with the narrow edge slabs and then moving to the remaining slabs. Pre-positioning and initial adjustment: Move the crane-driven lifting device 2 to achieve a rough initial alignment of multiple hooks 14 with multiple lifting points. The adjusting component 42 then adjusts the position of two hooks 14 to further align them with the lifting points, achieving a second adjustment. Connect the hooks 14 to the lifting rings 11. Rotate the rotating component 52 to wind up the adjusting steel rope 13, making the adjusting steel rope 13 taut. Based on the tension difference detected by the detectors 64 at various locations, if the difference is greater than a specified threshold, the adjusting component 42 and / or the moving component 32 work together to adjust the position of the two hooks 14, monitoring the tension difference in real time until the difference is less than or equal to the specified threshold. Simultaneously, based on the levelness detected by the level instrument 62, continue to adjust the position of the two hooks 14 until the levelness reaches the preset threshold.

[0081] Based on the verticality of the adjusting steel rope 13 detected by the detector 64, the control unit controls the adjusting component 42 to start driving the two hooks 14 to move simultaneously, so that the verticality of the adjusting steel rope 13 at both points reaches the preset threshold, thereby making the tension of each adjusting steel rope 13 tend to be consistent and the hoisting device 2 in a horizontal state, until the adjustment makes each parameter meet the preset threshold requirements.

[0082] When lifting the composite floor slabs, the first stage of position adjustment is performed on the lifting points to ensure that the force on each lifting point is balanced. During the subsequent lifting process, the second stage of position adjustment is performed on the lifting points to dynamically maintain the force balance on each lifting point. After the composite floor slabs are in place, they are lowered to the target installation position. After placement, the flatness of the floor slabs is checked, and the gaps at the supports are sealed. This greatly improves construction efficiency, stability, and safety.

[0083] To verify the effectiveness of the phased force balance control method of this invention, a reinforced concrete truss composite floor slab in a prefabricated multi-story civil building project was used as the test object (specifications: slab length 4500mm, slab width 2400mm, slab thickness 60mm, weight approximately 2.5 tons, hoisted at 6 points). Four control modes were compared and tested: traditional hoisting method (no force adjustment), adjustment only in the first stage, adjustment only in the second stage, and the two-stage coordinated adjustment method of this invention. The test data are as follows: Table 1: Data from the first stage of position adjustment experiment Data Analysis: When using traditional hoisting methods (without load adjustment), the maximum pressure deviation at each hoisting point reached ±18.6%, and the maximum tilt angle of the slab reached 4.8°, far exceeding the requirements for safe hoisting and posing a risk of floor slab cracking. After the first-stage adjustment, the pressure deviation at each hoisting point converged to ±6.2% within 8.5 seconds (less than the first threshold T=10%), the tilt angle of the slab decreased to 1.6°, and the uniformity of load distribution was significantly improved. During this stage, the average adjustment amount at the hoisting point was approximately 15mm. The test results verified the effectiveness of the first-stage adjustment—initial load balance at each hoisting point could be quickly achieved through coarse adjustments at the initial stage of hoisting.

[0084] Table 2: Data from the second stage of position adjustment experiment Data Analysis: Traditional hoisting methods, due to factors such as wind and inertia, further amplify the pressure deviation at each hoisting point to ±22.4% during lifting, resulting in a dynamic tilt angle of the slab surface reaching 5.6° and a strain fluctuation of over 15% in the reinforcing bars. Even with only the second-stage adjustment (without the first-stage pre-adjustment), although real-time compensation for stress deviations occurs during hoisting, the pressure deviation at each hoisting point still reaches ±3.2% due to incomplete initial balancing at the beginning of lifting, and the pressure deviation exceeds the threshold 23 times. Using the two-stage coordinated adjustment of this invention, the maximum pressure deviation at each hoisting point is only ±2.8% (less than the second threshold t=4%), the dynamic tilt angle of the slab surface is only 0.8°, and the strain fluctuation of the reinforcing bars is controlled within 3.0%, significantly improving stress uniformity compared to traditional hoisting methods. The response time for a single compensation adjustment is approximately 120ms, and the pressure deviation exceeds the threshold only 12 times during the entire hoisting process, proving that the second-stage fine-tuning effectively maintains stress balance at each hoisting point.

[0085] Table 3: Overall Effect of Two-Stage Coordinated Regulation Comprehensive data analysis: (1) Comparison of force equilibrium: Traditional hoisting methods result in consistently large pressure deviations (±18.6% to ±22.4%) at various lifting points throughout the entire hoisting and transportation process, leading to severe uneven stress distribution and being a primary cause of floor slab cracking. Using only the first-stage adjustment improves stress balance during the hoisting phase (±6.2%), but due to the lack of continuous fine-tuning during transportation, the deviation widens again to ±18.5%. Using only the second-stage adjustment provides good stress balance during transportation (±3.2%), but the initial deviation is large because no coarse adjustment was performed during the hoisting phase. Using the two-stage coordinated adjustment of this invention, coarse adjustment is completed during the hoisting phase (±6.2%), and fine adjustment is completed during the transportation phase (±2.8%), resulting in optimal stress balance throughout the entire process.

[0086] (2) Comparison of cracking rate and precision: Traditional hoisting methods result in a floor slab cracking rate of 8.5% and a positioning accuracy deviation of ±8.5mm. Using only the first-stage adjustment reduces the cracking rate to 5.2%, but the accuracy remains unsatisfactory (±6.2mm). Using only the second-stage adjustment reduces the cracking rate to 1.8% and improves the accuracy to ±4.0mm. Using the two-stage coordinated adjustment of this invention, the cracking rate is only 0.5%, with a positioning accuracy deviation of ±2.0mm, representing the optimal result.

[0087] (3) Efficiency comparison: The longest lifting cycle (14.5 min / block) was achieved using only the first-stage adjustment because the block needed to remain at low altitude for an extended period after lifting. The lifting cycles for using only the second-stage adjustment and the two-stage coordinated adjustment of this invention were 10.5 min and 10.8 min respectively, showing little difference. This indicates that the second-stage fine-tuning can be completed simultaneously during lifting without affecting the overall lifting efficiency.

[0088] (4) Optimal parameter combination verification: The experiment further verified the rationality of the parameter ranges in claims 9 and 10 of this invention. When the first threshold T = 10% Pavg, the first stage can complete convergence within 8.5 seconds; if T is too small (e.g., 5%), the convergence time is extended to more than 20 seconds, affecting efficiency; if T is too large (e.g., 20%), the force balance during the lifting stage is insufficient, increasing the burden of subsequent fine-tuning. When the second threshold t = 4% Pavg, the force deviation during the lifting stage can be stably controlled within ±3%; if t is too small (e.g., 1%), frequent system adjustments lead to increased response time; if t is too large (e.g., 8%), the fine-tuning effect is insufficient. The configuration of the first sampling frequency F = 10Hz and the second sampling frequency f = 50Hz can meet the detection accuracy requirements of both stages while avoiding the data processing burden caused by excessively high sampling frequencies.

[0089] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A fabricated composite floor slab installation process, characterized in that: The method comprises the following steps: S1, hoisting preparation; S2, hoist the composite floor slab in the order of first edge narrow plate and then the rest of the plate; S3, pre-positioning and initial adjustment: before hoisting each composite floor slab, the hoisting device (2) drives and adjusts the multiple hooks (14) connected with the adjustment steel wire (13) to realize visual alignment with the multiple lifting points, adjusts the positions of the multiple hooks (14) to make the multiple hooks (14) further aligned with the multiple lifting points, connects the multiple hooks (14) with the multiple lifting points, adjusts the movement of the adjustment steel wire (13) to make the adjustment steel wire (13) tensioned, monitors the tension difference and verticality of the adjustment steel wire (13) connected with each hook (14) and the levelness of the hoisting device (2), and adjusts until the preset requirements are met; S4, stage stress balance control: hoist the composite floor slab, make the first stage position adjustment of the lifting points in the early stage of hoisting to balance the stress of each lifting point, and make the second stage position adjustment of the lifting points in the subsequent hoisting process to dynamically maintain the stress balance of each lifting point; S5, after the composite floor slab is positioned, the composite floor slab is lowered to the target installation position, the flatness of the floor slab is checked after positioning, and the gap at the support is sealed.

2. The installation process of the assembled composite floor slab according to claim 1, characterized in that: The hoisting device (2) comprises multiple groups of hoisting mechanisms (3) arranged at intervals on the main hoisting beam (12), and the hoisting mechanism (3) comprises: a sub-hoisting beam (31) slidingly arranged on the main hoisting beam (12); a moving piece (32) arranged on the main hoisting beam (12) and used for driving the sub-hoisting beam (31) to move; two adjustment seats (33) slidingly arranged on the sub-hoisting beam (31) in opposite directions, the sliding direction being parallel to the moving direction of the sub-hoisting beam (31), and each being provided with a pulley assembly (22); an adjustment assembly (4) used for driving the two adjustment seats (33) to move closer to or away from each other; a winding assembly (5) arranged on the sub-hoisting beam (31) and used for winding or unwinding the adjustment steel wire (13), both ends of the adjustment steel wire (13) being wound around the pulley assemblies (22) on the two adjustment seats (33) and being connected with the hooks (14); a monitoring assembly (6) used for monitoring the tension difference and verticality of the adjustment steel wire (13) connected with the two hooks (14) and the levelness of the hoisting device (2) in real time; The adjustment assembly (4) and the moving piece (32) are electrically connected with the monitoring assembly (6) to form a closed-loop feedback loop, and an adjustment instruction is output to the adjustment assembly (4) and the moving piece (32) according to the tension difference and verticality of the two adjustment steel wires (13) and the levelness deviation of the main hoisting beam (12).

3. The fabricated composite floor slab installation process according to claim 2, wherein: The adjustment assembly (4) comprises: an adjustment screw (41) rotationally arranged on the sub-hoisting beam (31) and formed with two thread segments opposite to each other and threadedly connected with the two adjustment seats (33); an adjustment piece (42) arranged on the sub-hoisting beam (31) and used for driving the adjustment screw (41) to rotate; a turntable (43) arranged on the end of the adjustment screw (41) away from the adjustment piece (42) and used for manually driving the adjustment screw (41) to rotate.

4. The fabricated composite floor slab installation process of claim 2, wherein: The winding assembly (5) comprises: The winding reel (51) is rotatably mounted on the auxiliary lifting beam (31) via the rotating shaft (17), and the adjusting steel rope (13) is wound up in the winding reel (51). A rotating component (52) is provided on the auxiliary lifting beam (31) and is used to drive the rotating shaft (17) to rotate; Locking element (53) is used to lock the reel (51).

5. The fabricated composite floor slab installation process according to claim 4, wherein: The locking component (53) includes a locking tooth (55) and a locking disc (56). The locking tooth (55) is coaxially disposed on the rotating shaft (17), and the locking disc (56) is slidably disposed on the auxiliary lifting beam (31) and is positioned on the rotating shaft (17) after being inserted and engaged with the locking tooth (55).

6. The fabricated composite floor slab installation process of claim 2, wherein: The monitoring component (6) includes: Multiple sets of testing components (61) are set on the auxiliary lifting beam (31) and are used to test the tension and verticality of the adjusting steel rope (13). The testing component (61) includes a testing rod (63) and a testing instrument (64). The testing rod (63) is slidably set on the auxiliary lifting beam (31) in the direction close to or away from the adjusting steel rope (13), and is connected to the auxiliary lifting beam (31) through an elastic element (65). A guide roller (66) is rotatably installed at the end close to the adjusting steel rope (13). The testing instrument (64) is set on the auxiliary lifting beam (31). The adjusting steel rope (13) passes around the guide roller (66) and pushes the testing rod (63) against the testing instrument (64) to realize the detection of tension. A level (62) is installed on the auxiliary lifting beam (31) and is used to detect the levelness of the auxiliary lifting beam (31). The adjustment component (4), the moving part (32), the detection part (61) and the level (62) are all electrically connected to the control unit to form a closed-loop feedback loop.

7. The fabricated composite floor slab installation process of claim 2, wherein: The first stage of position adjustment specifically includes: The hoisting device (2) lifts the stacked floor slab to a first height H above the ground at a first speed V. The real-time pressure value P of each hoisting point is collected by multiple sets of monitoring components (6) at a first sampling frequency F. The deviation ΔP = |P-Pavg| between the pressure of each hoisting point and the average pressure Pavg is calculated. If any ΔP exceeds the first threshold T, the adjustment component (4) and / or the moving part (32) are activated to adjust the position until all ΔP converges to within the first threshold T.

8. The fabricated composite floor slab installation process of claim 7, wherein: The second stage of position adjustment specifically includes: The hoisting device (2) hoists the composite floor slab to the target installation position at a second speed v. During the hoisting process, the real-time pressure value P(g) of each hoisting point is continuously collected at a second sampling frequency f. The real-time deviation ΔP(g) is calculated. If ΔP(g) exceeds the second threshold t, the adjustment component (4) and / or the moving component (32) are activated to adjust the position until ΔP(g) converges to within the second threshold t. Wherein, t < T.

9. The fabricated composite floor slab installation process of claim 8, wherein: The first threshold T is 8% to 12% of the average pressure Pavg, and the second threshold t is 3% to 5% of the average pressure Pavg.

10. The fabricated composite floor slab installation process of claim 8, wherein: The first sampling frequency F is not less than 5Hz, the second sampling frequency f is not less than 10Hz, the first sampling frequency F is less than the second sampling frequency f, the first height H is 300mm~500mm, and the first speed V is less than the second speed v.

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