Prefabricated Panel Splicing in Houses

Prefabricated panel splicing in houses has different applications and characteristics in various scenarios, as detailed below:

Rural Self-Built Houses

In rural self-built houses, the splicing of prefabricated panels is becoming increasingly common. Compared to the traditional use of concrete and steel bars, this method is less labor-intensive. However, there are certain risks associated with using only prefabricated panels. If budget constraints lead to the choice of pure prefabricated panels, cracks may appear in the middle of the living room during winter heating, and the roof may be prone to water leakage during rain. This is because the overall integrity and sealing of pure prefabricated panel splicing are relatively poor, making it difficult to effectively resist temperature changes and rainwater erosion.

Combination Scheme of Prefabricated Panels + Cast-in-Place Bands

To address the issues with pure prefabricated panel splicing, a combination scheme of prefabricated panels and cast-in-place bands can be adopted. The core of this scheme is to use cast-in-place concrete bands to 'lock' the scattered prefabricated panels into a single unit, enhancing the structural stability and integrity. When selecting prefabricated panels, choose 'prestressed hollow panels' with holes in the middle and ensure they are 'national standard compliant products'. Carefully inspect the appearance for any cracks, chipped corners, or other defects. When creating cast-in-place bands, position them directly above load-bearing walls and at all prefabricated panel joints, with a width generally controlled between 15 and 20 centimeters to ensure the bands can fully serve their connecting and reinforcing functions.

Composite Floor Slabs

Composite floor slabs are assembled integral floor slabs formed by the superposition of prefabricated panels and cast-in-place reinforced concrete layers, with the prefabricated panels serving as both structural components and permanent formwork. Their common span ranges from 4 to 6 meters, and the thickness of the cast-in-place layer is determined based on the span, typically not less than 90mm. Composite floor slabs offer advantages such as strong overall continuity, template savings, and ease of transportation and installation. During construction, ensure the surface of the prefabricated panels is clean and moist to ensure good bonding between the cast-in-place layer and the prefabricated panels. Additionally, avoid using early-strength agents that can corrode steel bars to prevent compromising the structural safety and durability.

Prefabricated Panel Houses in Old Residential Areas

Prefabricated panel houses in old residential areas were built quickly in the past to address housing shortages, using factory-made cement panels (prefabricated panels) assembled like building blocks on walls and bonded with cement mortar. This splicing method has numerous issues, such as poor durability at the joints, with mortar cracking and flaking over time, leading to loosening between panels, resulting in floor slab shaking and water leakage. Most prefabricated panels are hollow with weak 'skeletons', containing thin and few steel bars distributed irregularly, making them poorly resistant to earthquakes.