Prefabricated House Lifting Plan

The prefabricated house lifting plan requires systematic planning from four aspects: construction preparation, process flow, safety and quality measures, and material and labor management, to ensure efficient and safe construction.

I. Construction Preparation

1. Organizational Structure: Clearly define the project manager's overall responsibility, the technical leader's role in formulating technical plans, and the construction team's tasks in executing lifting and connection operations according to their divisions, forming a closed-loop responsibility system.
2. Materials and Equipment:
   • Prefabricated Components: Submit demand plans and loading sequence lists to the factory seven days in advance to ensure the timely supply of floor slabs, walls, stairs, and other components as needed.
   • Lifting Equipment: Select equipment based on component weight, such as a 6517B-10 tower crane with a 30-meter boom and a maximum lifting capacity of 6 tons, or a truck crane; equip with steel wire ropes, lifting claws, shackles, and other tools, and inspect their integrity.
   • Auxiliary Materials: Prepare safety harnesses, protective nets, diagonal braces, and straight connectors to ensure construction safety and component stability.
3. Site Layout:
   • Construction Roads: Use a 200mm-thick C20 concrete pavement with a width of 4 meters and a turning radius of 15 meters, and implement drainage measures to ensure smooth traffic for transport vehicles.
   • Survey Control: Establish permanent longitude and latitude coordinate piles and level piles to form a survey control network, providing a reference for component positioning.
   • Temporary Facilities: Use detachable prefabricated houses to build warehouses, dormitories, and offices, facilitating later dismantling and site restoration.

II. Process Flow

1. Component Transportation: Select transport vehicles based on component size and weight, and secure them firmly to prevent damage; plan routes before transportation to avoid obstacles.
2. Lifting Operations:
   • Inspect equipment and lifting tools, and select lifting points (such as modular lifting beams) according to component characteristics to ensure even force distribution.
   • Slowly lift to 500mm above the ground, inspect the appearance and connections; then lift to 600mm above the working level and use tag lines to control the descent, avoiding collisions.
   • Temporarily fix the component in place after lifting, and reinforce it with diagonal braces or bolts to ensure stability.
3. Connection and Alignment:
   • Use welding or bolting for connections, ensuring the connection areas are clean and dry to prevent rust from affecting strength.
   • Use level gauges, plumb bobs, and other tools to align the position, verticality, and elevation, adjusting deviations with jacks or diagonal brace adjustment rods to ensure accuracy.
4. Reinforcement and Finishing: Reinforce components according to design requirements, pour structural concrete, and apply sealant for finishing, sealing gaps to prevent leakage.

III. Safety and Quality Measures

1. Safety Monitoring: Assign a full-time safety officer to strengthen monitoring of cross-operations, focusing on inspecting the use of protective nets and safety harnesses in the lifting area.
2. Acceptance Standards: After connection, inspect the connection quality, checking for full welds and tight bolts to ensure compliance with design requirements.

IV. Material and Labor Management

1. Ensure at least one flatbed trailer loaded with PC components is parked in each construction area to avoid wasting time on secondary lifting.
2. Calculate tool quantities in advance and customize them to ensure they are in place before the construction date, reducing the risk of work stoppages due to material shortages.