Prefabricated House Installation Manual

The installation of prefabricated houses should follow the following key steps and precautions:

I. Classification and Installation Sequence of Prefabricated Components Prefabricated components are mainly divided into three parts: columns, wall panels, and beams. The installation sequence must strictly adhere to design requirements. Column components should be installed in the order of foot columns → side columns → central columns to ensure structural stability. Shear wall panels should follow the principle of "exterior walls first," prioritizing the hoisting of wall panels connected to the cast-in-place sections for easier subsequent construction衔接 (connection). Beam components should be installed in the order of main beams → secondary beams, from low to high, to avoid interference from cross-operations.

II. Setting of Installation Control Lines Control lines are crucial for ensuring accurate positioning of components. Prefabricated columns should use the axis and outer contour lines as references, with side and corner columns calibrated using the outer contour lines to prevent deviation. Shear wall panels should employ dual control using both the axis and contour lines, with additional verification of verticality for exterior walls to avoid waterproofing issues caused by cumulative errors.

III. Wall Panel Compartmentalization and Grouting Process If wall panels require compartmentalized grouting, use bedding mortar to divide the areas and ensure grout density. For multi-story shear walls, the material laying thickness during grouting should not exceed 20mm and must be evenly covered to prevent cracking due to localized stress concentration. After grouting, check the grout fullness and perform supplementary grouting if necessary.

IV. Hoisting and Verification of Composite Slabs After hoisting composite slabs, immediately verify the height difference and width of the slab bottom joints. If the height difference exceeds the standard (usually ≤3mm), re-hoist and adjust to the design value using adjustable supports to avoid uneven floor surfaces later. The joint width must comply with specifications to prevent mortar leakage during concrete pouring.

V. Temporary Support and Removal Management Temporary support systems can only be removed after the strength of the post-poured concrete reaches 100% of the design value. Before removal, perform strength rebound testing and follow the principle of "last installed, first removed" to avoid structural instability. After support removal, inspect the components for deformation and promptly repair any issues.

VI. Base Treatment and Slab Joint Protection Before installing prefabricated slabs, wet the top surface of the wall and level it with high-grade cement mortar to ensure a base flatness error of ≤5mm. Slab bottom supports should be calculated based on component loads to prevent cracking. Slab joint treatment should use waterproof mortar or sealant, with a depth of not less than 20mm, and perform a water spray test to verify sealing.

VII. Technical Specifications and Safety Production Construction must strictly adhere to standards such as the "Technical Specification for Grouting of Steel Bar Connecting Sleeves" and the "Technical Specification for Prefabricated Concrete Structures," focusing on controlling the grout density of sleeves, the anchorage length of steel bars at cast-in-place joints, and the lap width of exterior wall waterproofing layers. Additionally, strengthen protection for high-altitude operations, manage temporary electricity use, regularly inspect hoisting equipment performance, and ensure construction safety.