How to Construct and Reinforce the Roof of a Prefabricated House

The construction and reinforcement of the roof of a prefabricated house require selecting appropriate methods based on specific circumstances. Here are the key operational points:

I. Construction of Prefabricated Panel Roofing The construction of prefabricated panel roofing primarily uses materials such as cement prefabricated panels and lightweight sandwich panels, which need to be produced in a factory and then transported to the site for installation. When using prefabricated panels for ceiling installation, first locate the holes in the round-hole panels, use a hammer to open a hole approximately 80 millimeters long and 40 millimeters wide, and place a steel bar approximately 200 millimeters long and 14 millimeters in diameter into the panel hole, ensuring that the contact surface between the steel bar and the panel hole is flat. Subsequently, make a wooden block measuring 40 millimeters by 40 millimeters and approximately 150 millimeters long, and firmly bind the wooden block to the steel bar with No. 8 lead wire to form a stable connection node. The main keel needs to be connected to the wooden block through special hanging pieces to ensure the stability of the overall structure. The advantages of this construction method include fast speed and reduced on-site wet work, but the following points need to be noted:

1. Structural Adaptability: It is necessary to select the type of prefabricated panel according to the overall design of the house to avoid structural problems caused by mismatched loads.
2. Waterproofing Treatment: After construction is completed, a waterproof layer needs to be laid on the roof. It is advisable to choose weather-resistant waterproof membranes or coatings and ensure that the joints are tightly sealed.
3. Cost Consideration: The cost of prefabricated panel materials and lifting equipment is relatively high, and a comprehensive assessment needs to be made in conjunction with the budget.

II. Reinforcement of Prefabricated Panel Roofs Targeted reinforcement measures need to be taken for common damages to prefabricated panel roofs:

1. Cracking or Damage to Panel Joints: If the prefabricated panels are pulled apart or damaged, first clean out the debris in the gaps, refill them with cement mortar, and ensure that the filling is dense and free of voids. Subsequently, reinforce the panel joints with steel bars, such as implanting horizontal steel bars with a diameter of 10-12 millimeters and covering them with fine aggregate concrete to enhance the tensile strength of the panel joints.
2. Overall Displacement of the Roof: If the roof moves due to foundation settlement or external forces, use must be immediately suspended, and the support must be reinforced. The iron pipe support method can be adopted, where adjustable hydraulic jacks or screw supports are set up below the roof to reset the roof through uniform force application; if the displacement is severe, brick piers need to be added as permanent supports, with the spacing between the brick piers not exceeding 1.5 meters and reliably connected to the original structure. Reinforcement construction must strictly follow safety regulations: Before operation, the load on the roof must be calculated to avoid overloading; reinforcement materials must comply with national standards, for example, steel bars should be of HRB400 grade or higher, and the strength of cement mortar should not be lower than M10.