Precast concrete components include columns, interior and exterior walls, bay windows, beams, composite slabs, and balcony slabs.

　　1. Hold up the item for sale

　　 Precast concrete components Installation shall be carried out using standard lifting appliances, which shall be equipped with built-in lifting eyes or built-in steel connecting nuts.

　　2. Lifting Method

　　Due to the varying sizes of precast concrete components, when a component is excessively large or wide, a multi-point lifting method may be employed, using adjustable girders to lift the component uniformly. The lifting force must be aligned with the component’s center of gravity.

　　The lifting of vertical precast concrete components shall be performed using a slow–fast–slow operating sequence.

　　When lifting composite beams, the main girder must be lifted first; before raising the auxiliary girder, the transverse beam must be properly aligned. Select steel beam spreader beams suitable for lifting operations, and ensure that the slings match those used for the precast composite beam.

　　Layer upon layer of Precast concrete components During lifting operations, the crane must be kept balanced, and there must be at least four lifting points.

　　When lifting precast stair components with a hoist, the landing platform of the precast staircase must be kept level by using adjustable cross beams to balance the hoist; the hoist must have at least four lifting points.

　　Prefabricated balcony slabs shall be lifted using a dedicated steel spreader beam, with the horizontal angle between the lifting ropes and the spreader beam maintained at 55° to 65° during lifting.

　　When the air-conditioning panel is lifted, the horizontal angle between the rope and the prefabricated air-conditioning panel should be 55° to 60°. Precast concrete components

　　3. Operating Procedures

　　According to the Code for Construction of Concrete Structural Works, the delivery of precast components must comply with the following provisions:

　　(1) Lifting slings and lifting attachments shall be selected in accordance with the shape, dimensions, weight, working radius, and other requirements of the precast components. The lifting slings and attachments used, as well as the associated construction operations, shall comply with the relevant provisions of current national standards and the product application technical manuals.

　　(2) Measures shall be taken to ensure that the position of the main hook of the lifting equipment, as well as the center of gravity of the lifting attachments and components, are aligned in the vertical direction. The horizontal angle between the slings and the components shall not be less than 60°, nor less than 45°. During transportation, the load must be kept stable, with no deviation or significant swaying.

　　(3). To ensure the safe lifting of precast components, cable slings must be installed on the components during lifting to control their rotation and ensure smooth handling. During on-site operations, two symmetrical cable slings are typically positioned on either side of the component’s base; as the component approaches its installation position, it is slowly pulled from both sides toward the floor and then gently set down. Concrete precast components

　　(4). During transportation, dedicated personnel must be assigned to direct the operation, and operators must maintain a safe and secure position; they must not be suspended together with the precast components.

　　Prefabricated flooring, prefabricated balcony

　　The use of precast floor slabs is an important measure for reducing on-site formwork support, saving labor and material handling, achieving economic benefits, lowering construction costs for precast concrete structures, shortening project schedules, and ensuring quality. Prestressed floor slabs, in particular, effectively leverage the high-strength properties of materials, allow for smaller cross-sectional dimensions, reduce steel consumption, conserve energy, and lower carbon emissions. Moreover, precast floor slabs offer high production efficiency and rapid installation, yielding substantial economic benefits.