Prefabricated House Hoisting Atlas Images
Currently, a complete set of images from the prefabricated house hoisting atlas has not been directly found, but the hoisting process can be understood through relevant diagrammatic information. The following is a diagrammatic explanation of the key steps for hoisting prefabricated components in the construction of prefabricated buildings:
1. Frame Column Hoisting
The hoisting of frame columns must strictly follow the process of "padding tires - straightening - positioning - centering adjustment". First, tires or steel pads are placed at the column base to prevent damage from direct contact with the ground during hoisting. Subsequently, the verticality of the column is adjusted using lifting ropes to ensure it is straightened before slowly lowering it into the foundation cup. After positioning, a jack or manual hoist is used for lateral fine-tuning, and finally, centering calibration is completed using a laser level or plumb line. During this process, it is crucial to control the verticality deviation of the column to be ≤ H/1000 (where H is the column height) to ensure structural stability.
2. Lotus Root Beam Hoisting
The hoisting of lotus root beams (prestressed double-T beams) requires staged operation: During transportation, stacking is used, with wooden blocks placed between each layer of beams to prevent steel bar collisions. Before hoisting, installation positions are marked on the steel bars at the beam ends for quick positioning. When the lifting gear is in place, a four-point lifting method is used, and adjustable hooks are employed to balance the beam's curvature. During the leveling stage, a level is used to monitor the beam's axis, with an error controlled within ±5mm. During installation, the steel bars at the four corners are fixed first, followed by temporary reinforcement with diagonal supports, and finally, micro-expansion concrete is poured to complete the permanent connection.
3. Primary and Secondary Beam Hoisting
The core of primary and secondary beam hoisting lies in "installation and positioning - adjustment - steel bar sleeve connection". For primary beam hoisting, priority is given to completing the steel bar anchoring at the supports, while secondary beams are fixed using temporary support frames. During the adjustment stage, chain blocks are used for planar displacement correction to ensure uniform beam end gaps. Steel bar connections are made using mechanical sleeves or welding processes, and it is necessary to check the tightening torque of the sleeves or the quality of the welds to meet the requirements of the "Code for Welding of Steel Structures".
4. Composite Floor Slab Hoisting
Composite floor slab hoisting requires achieving overall stress through truss steel bars: During the lifting stage, a special lifting frame is used to hook the lower chord steel bars of the truss to avoid local stress concentration. For support frame erection, independent steel supports are arranged according to the designed spacing, with an elevation error ≤ 3mm. During positioning, a laser line projector is used to control the alignment of the floor slab edges, and the width of adjacent slab joints is controlled between 30-50mm to create conditions for subsequent cast-in-place layer construction.
For a complete atlas, it is recommended to consult the appendix illustrations in the "Technical Specification for Prefabricated Concrete Structures" (JGJ1-2014) or contact the provincial-level Institute of Building Sciences for standardized construction drawings.
