Roof Construction Methods for Prefabricated Panel Buildings

The roof construction method for prefabricated panel buildings typically involves directly placing the prefabricated panels on the walls and enhancing safety through structural columns and ring beams.

Construction Method

Prefabricated panels are cement components manufactured in factories. During production, wooden formwork is first nailed together, followed by the placement of steel reinforcement and the pouring of cement to form the panels. For roof construction, the prefabricated panels are directly placed on brick walls and do not form an integral structure with the walls. This method is relatively low-cost and simple to construct, allowing for faster construction speeds.

Disadvantages and Risks

• Poor Integrity: The prefabricated panels are separated from the walls and do not form an integral structure, serving only as a covering and unable to provide tensile force or stability.
• Weak Seismic Performance: In the event of geological disasters such as earthquakes, the prefabricated panels and walls are prone to separation, leading to a risk of collapse.
• Prone to Leakage: The prefabricated panels are connected using concrete or cement mortar, which can develop cracks over long-term use, causing leakage issues.
• Risk of Foundation Settlement: If uneven settlement occurs in the foundation, the prefabricated panels may develop cracks due to stress concentration, affecting the structural safety of the building.

Regular Practices for Enhancing Safety

To compensate for the deficiencies of prefabricated panel roofs, regular construction involves the use of structural columns and ring beams:

• Structural Columns: Reinforced concrete columns are placed at key locations in the walls to form connections with the prefabricated panels, enhancing the restraint force of the walls.
• Ring Beams: Closed reinforced concrete beams are placed around the perimeter of the roof, forming a 'checkerboard pattern' with the structural columns to improve overall seismic resistance.

Precautions

• Ensure that the foundation is level and solid before construction to avoid the risk of later settlement.
• Strictly control the levelness of the prefabricated panels during installation to prevent stress concentration at the connections due to tilting.
• Fill the connection areas with high-strength concrete or waterproof mortar and regularly inspect for cracks.
• In earthquake-prone areas, it is recommended to prioritize cast-in-place concrete roofs or increase the density of structural columns and ring beams.