Construction of Cement Prefabricated Houses in Qinghai

The construction of cement prefabricated houses in Qinghai requires comprehensive consideration of multiple factors such as ecological protection, thermal insulation, earthquake resistance, efficiency, and standardized management, utilizing prefabricated technology to achieve efficient, safe, and environmentally friendly construction goals.

1. Ecological Protection and Construction Method Selection
The ecological environment in the high-altitude and cold lake regions of Qinghai is fragile. Traditional cast-in-place construction, due to its long cycle and significant disturbance, is prone to damaging surface vegetation and permafrost. The "unified planning and construction" model of prefabricated cement houses has become the preferred choice. By prefabricating components in factories and assembling them quickly on-site, the construction cycle is shortened by more than 50%, while reducing on-site wet operations and minimizing interference with the plateau's ecology. For example, in projects around Qinghai Lake, this model has increased the ecological restoration rate during construction to over 90%.

2. Thermal Insulation Layer Construction and Climate Adaptability
Qinghai has a plateau continental climate with large diurnal temperature variations and strong ultraviolet radiation. The exterior wall insulation requires the use of highly durable materials, such as rock wool board thin plaster systems, with a thermal conductivity coefficient ≤ 0.040 W/(m·K), capable of adapting to temperature variations from -40°C to 60°C. The design service life should be ≥ 25 years, and the wind pressure resistance value should be ≥ 1.0 kPa to ensure that the insulation layer does not detach in strong wind environments. Additionally, the exterior finish should use ultraviolet-resistant coatings to prevent material aging and a decline in insulation performance.

3. Earthquake Resistance and Structural Safety Design
Prefabricated houses are constructed using national standard deformed steel bars and C35 concrete, with a main structural strength of 35 MPa, capable of withstanding earthquakes below magnitude 8. Wall thickness is differentiated by function: load-bearing walls are 0.24 meters thick, and non-load-bearing walls are 0.18 meters thick, with reliable anchoring between components achieved through steel bar connectors. For example, in the post-earthquake reconstruction in Yushu, such structures underwent actual shaking table tests, with an inter-story displacement angle ≤ 1/500, meeting seismic fortification requirements.

4. Construction Efficiency and Quality Control
The production line for prefabricated components employs automated control, with a material placement speed of 10 seconds per piece, improving efficiency by 4-6 times compared to traditional manual methods. The compactness of the components is controlled through high-frequency vibration molding technology, with a porosity ≤ 3%, ensuring an alignment accuracy error ≤ 2 mm during installation. On-site construction only requires lifting and bolt connections, shortening the assembly cycle of a single house to 7-10 days, with quality stability superior to cast-in-place techniques.

5. Application Scenarios and Standardized Management
Prefabricated houses are suitable for scenarios such as new rural construction, homestays, and business hotels, with the entire construction process adhering to the "Technical Standard for Prefabricated Concrete Structures" (GB/T 51231-2016). From planning and design to acceptance, collision detection must be conducted using BIM models to ensure component dimensional accuracy; on-site installation requires calibration with laser positioning instruments, and acceptance must include testing for airtightness (n50 ≤ 1.5/h) and water tightness (no leakage under a pressure difference of 1000 Pa), ensuring the building's performance throughout its lifecycle.