Requirements for Hoisting High-rise Prefabricated Houses

The requirements for hoisting high-rise prefabricated houses are as follows:

Understanding of Project Overview: It is necessary to clarify the building structure type, height, number of floors, types of prefabricated components, their weights and dimensions, and the hoisting scope. For example, the maximum weight of a single prefabricated shear wall component is 12 tons, with dimensions of 3m × 2.8m × 0.2m; parameters for other components such as prefabricated composite floor slabs also need to be thoroughly understood.

On-site Environmental Conditions:

• Site Layout: It is essential to understand the surrounding environment, such as the north side facing the main urban road, the east side being the component stacking area, the distance from the existing building on the west side, and the south side being the temporary material storage yard.
• Foundation Conditions: The backfilled soil on the site must be compacted in layers, and the natural bearing capacity must meet the requirements. The hoisting operation area needs to be paved with a gravel cushion and reinforced concrete roadbed boxes, such as a 20cm thick gravel cushion + 1.5m × 1.5m × 0.2m reinforced concrete roadbed boxes.
• Transportation Conditions: The width of the passage from the main road to the site must meet the traffic requirements, allowing the passage of truck cranes weighing over 25 tons and component transport vehicles.

Compilation Basis: Follow national regulations, such as the 'Technical Code for Safety of Construction Machinery Use' and the 'Technical Code for Safety of Hoisting Engineering'; rely on project documents, such as construction organization designs and design drawings for prefabricated components; and refer to equipment information, such as the factory performance manuals of cranes.

Construction Deployment:

• Personnel Organization and Responsibilities: Clarify the responsibilities and qualification requirements for each position (project manager, technical leader, hoisting commander, etc.).
• Selection of Machinery and Rigging: Select cranes based on parameters such as component weight, working radius, and lifting height, such as using a 100-ton truck crane (QY100K) to hoist a 12-ton prefabricated shear wall component; rigging must be selected according to component weight to ensure the safety factor meets the requirements.

Construction Preparation: Include detailed design of drawings, construction plan briefing, BIM simulation rehearsal, surveying and setting out, selection of hoisting equipment, configuration of rigging, preparation of connection materials, and preparation of safety protection materials. For example, use a total station for verification, with accuracy errors controlled within ±2mm; prepare high-strength grout and bedding mortar as connection materials.

Preliminary Planning: Clarify the responsibilities of all parties, deepen the design, plan the site and roads, anchor the tower crane, install external ladders, store components, prepare tools, and schedule component production. For example, when storing components, a maximum of 5 pieces can be stacked vertically per group, with two support points coinciding with the lifting points.

Implementation Phase: Inspect components upon arrival and prepare relevant work before hoisting the components.