Concrete Prefabricated Panel Wall House Structure

Concrete prefabricated panel walls are a type of building wall structure made primarily of Portland cement and steel reinforcement bars, prefabricated into panel shapes using molds. They are now restricted in use due to performance deficiencies.

Types and Characteristics

Concrete prefabricated panel walls come in two main types: solid and hollow. Hollow panels reduce weight through internal hollow designs, lowering material costs and transportation difficulties, and offering advantages such as easy construction and lower costs. Their production process involves nailing wooden planks to create hollow molds, arranging steel reinforcement bars inside, pouring cement, and then removing the molds after drying. This standardized production method made them widely used in early brick-and-concrete structures, especially for scenarios requiring rapid construction.

Specifications

The standard specifications of concrete prefabricated panel walls are limited by material strength and construction conditions:

• Span: The maximum length should not exceed 4.2 meters, as longer spans can lead to structural deformation;
• Width: Common widths are 500mm or 600mm, facilitating connection with brick masonry;
• Thickness: Mainly 120mm or 150mm, meeting requirements for load-bearing and sound insulation.

Application Scenarios and Limitations

Early on, due to their ability to be prefabricated and installed directly, concrete prefabricated panel walls significantly shortened masonry time and were widely used in low-rise residential buildings, factories, and other brick-and-concrete structures. However, their deficiencies gradually became apparent:

• Poor thermal insulation: The high thermal conductivity of cement and the ineffective improvement of insulation by hollow structures despite weight reduction;
• Insufficient structural stability: The connection between prefabricated panels and the main structure relies on node treatment, resulting in weaker earthquake resistance compared to cast-in-place structures;
• Limited load-bearing capacity: The arrangement density of steel reinforcement bars and the strength of cement limit their load-bearing capacity, making them unsuitable for high-rise or large-span buildings;
• Joint gap issues: Panels need to be connected using mortar or sealing materials, and long-term use can lead to cracking and water leakage due to settlement differences.

Current Status and Alternative Solutions

Due to the above deficiencies, concrete prefabricated panel walls are now restricted in use by standards such as the "Code for Fire Protection Design of Buildings", especially in areas with high earthquake resistance requirements. Modern buildings generally use cast-in-place reinforced concrete slabs as alternatives, which form seamless structures through integral pouring, significantly improving earthquake resistance, load-bearing capacity, and durability, while also allowing for improved thermal performance through the addition of insulation materials.