How to Fix Prefabricated Concrete Houses

The fixation of prefabricated concrete houses requires targeted methods based on structural types and scenarios. Common approaches are as follows:

I. Overall Reinforcement (Suitable for Old-Style Prefabricated Panel Houses)

Enhance structural integrity by pouring a reinforced concrete 'composite layer'. Specific steps include:

1. Surface Preparation: Clean dust and oil from the prefabricated panel surface to ensure a flat base.
2. Rebar Mesh Installation: Use 6mm-diameter rebar, spaced 20cm apart, woven into a mesh covering the entire panel. Connect the mesh to the existing rebar in the panel through tying or welding to form a continuous load-bearing system.
3. Concrete Pouring: Use fine aggregate concrete with a grade not lower than C25, with a thickness controlled between 5-8cm. After pouring, vibrate to ensure compactness, avoid honeycombing, and cover for curing for at least 14 days to prevent cracking.

II. Component Connection (Suitable for Modular Cement Prefab Houses)

Assemble columns, beams, panels, and other components in sequence during installation, enhancing connection strength through the following methods:

1. Bolt Connection: Pre-drill bolt holes at component joints, use high-strength bolts (e.g., Grade 8.8) for tightening, and pair with double nuts to prevent loosening. Bolt diameter should be calculated based on component size, generally not less than 12mm.
2. Sleeve Grouting: Install metal sleeves at the ends of rebar in prefabricated columns or beams, insert对接 (corresponding) rebar, and inject high-strength grout (e.g., CGM grout) with a strength reaching 1.15 times the design requirement. Keep the component stationary for more than 24 hours after grouting to ensure curing.

III. Nail Fixation (Suitable for Lightweight Prefab Panels)

1. Tools and Materials: Use an impact drill (with a 6-8mm alloy drill bit) and self-tapping screws (length ≥50mm, diameter ≥4mm). Screws should be stainless steel or hot-dip galvanized to prevent corrosion.
2. Positioning and Drilling: Avoid embedded pipelines (keep ≥10cm from panel edges), with nail spacing of 30-40cm in load-bearing areas. Drill depth should be 1-2cm shorter than the screw length, adjusting position by more than 5cm if encountering rebar.
3. Anchoring and Fixation: Inject epoxy resin anchoring agent into the hole, then use an electric screwdriver to drive the screw in, controlling torque between 4-6N·m. The anchoring agent should fully fill the pore to ensure tight bonding between the screw and concrete.

IV. Joint Reinforcement (Suitable for Multi-Story Panel Houses)

Use L-shaped angle brackets (thickness ≥3mm) with stainless steel expansion screws to fix joints:

1. Drill three staggered screws on each side of the joint to form a triangular load-bearing structure, enhancing shear resistance.
2. Screw spacing should not exceed 20cm, and the angle bracket should fit tightly against the panel without warping.

V. Extreme Climate Response

1. Wind Reinforcement: In typhoon-prone areas, increase nail density by 30%, focusing on reinforcing weak areas such as eaves and doors/windows.
2. Frozen Ground Areas: Use hot-dip galvanized screws to prevent low-temperature corrosion; the foundation should be buried below the frost line or adopt an independent foundation + insulation layer design.