1. Main Technical Content
Computer-controlled lifting and hoisting technology is a cutting-edge method for installing steel structures and large equipment. This advanced technique combines mechanical systems, hydraulics, computer control, and sensor monitoring to overcome challenges that traditional lifting methods could not address—such as height limitations, weight capacity, structural alignment, and site constraints. The process is known for its safety, reliability, maturity, and high economic efficiency. It operates on the principle of "flexible steel cable load-bearing, hydraulic cylinder clusters, and computer-controlled synchronized lifting." The computer precisely manages synchronization across all lifting points during the operation, ensuring smooth and controlled movement.
2. Technical Indicators
The design of any lifting or jacking plan must consider both the load-bearing structure (permanent or temporary) and the strength, stiffness, and stability of the steel structure or equipment being lifted. It’s essential to evaluate the overall mechanical performance under construction conditions and calculate the forces at each lifting point. Additionally, the supporting structures and foundations must be checked for bearing capacity and stability to ensure safety even in the worst-case scenarios. The unsynchronized movement at each lifting point should be calculated and set to an acceptable level.
The selection of the lifting mode aims to minimize the height of the load-bearing structure while maintaining its stability. It also ensures the stability and safety of the structure or equipment during the lifting process. When determining the number and position of lifting points, the priority is to guarantee stability during the lift, followed by minimizing the number of points to reduce complexity. The lifting equipment must be capable of meeting the project requirements—being compact, durable, easy to maintain, and adaptable to specific needs such as mobility, speed, and safety features.
3. Key Features of the Slip Method
The slip method is highly versatile and can be applied to various types of structures. For example, one-way trusses, two-way trusses, or grid structures with limited rigidity can be installed using this method by increasing support points, reducing span, expanding the assembly platform, or assembling multiple trusses simultaneously. The propulsion system used in the slip method can be a computer-controlled hydraulic crawler, offering high automation, ease of use, strong safety, and excellent reliability. Its flexibility makes it suitable for a wide range of applications.
4. Main Technical Measures of the Slip Method
1) Construction Plan Preparation: A detailed plan is developed to guide the entire process, including the division of slip units, assembly platforms, high-altitude assembly, traction systems, strip or cumulative sliding, drop-off locations, monitoring procedures, and emergency measures.
2) Erection of High-Altitude Assembly Platforms and Truss Assembly.
3) Installation of Slide Tracks.
4) Setup of Synchronous Sliding Systems.
5) Stress and Strain Monitoring: Ensures that the work is conducted under controlled and safe conditions.
5. Application Scope
This technology is ideal for large-span steel structures such as stadiums, theaters, hangars, and steel corridors where ground assembly is possible and surrounding support is adequate. It is also suitable for lifting ultra-high components like TV tower trusses and power plant boilers. Additionally, it can be used for upgrading large equipment such as main girders and boilers of heavy-duty gantry cranes.
6. Notable Projects Applied
Examples include the National Library's main steel structure (10,800 tons), the roof steel structure of the A380 aircraft maintenance warehouse at Capital International Airport (10,500 tons), the Shenzhen Civic Center's large roof, the Guangzhou New TV Tower, the installation of a 130mm × 4200mm CNC hydraulic coil machine at Dongfang Boiler Factory, and the overall upgrade of an 800t × 185m gantry crane (4,750 tons) at Offshore Oil Engineering (Qingdao). These projects demonstrate the effectiveness and versatility of the technology in real-world applications.
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