Installation of Color-Steel Mobile Toilets in Qinghai

The installation of color-steel mobile toilets in Qinghai requires adherence to the following key steps and technical considerations:

1. Adaptability Analysis of Installation Scenarios
   A systematic assessment of environmental conditions is necessary, including surface bearing capacity, depth of permafrost layers, and seasonal wind variations. The coefficient of thermal expansion and contraction for color-steel materials must be precisely calculated to prevent structural deformation due to temperature differences. For instance, in high-altitude regions with significant day-night temperature variations, expansion joints should be reserved or flexible connectors used to buffer stress.

2. Site Selection and Foundation Treatment
   Sites should avoid areas prone to geological disasters and ecologically sensitive zones, prioritizing flat terrain with good drainage. Foundation treatment must accommodate frequent freeze-thaw cycles:

   • Concrete pouring or prefabricated slab bedding should ensure a level and stable bearing surface;
   • In areas with deep permafrost, adjustable footing systems or crushed stone replacement layers can be used to mitigate frost heave damage to the structure.

3. Modular Assembly and Connection Technology
   The main structure employs modular assembly, with connection points utilizing high-strength galvanized bolts paired with sealing gaskets to balance rigid fixation and flexible buffering. Assembly must strictly adhere to torque control standards to prevent deformation of color-steel plates or seal failure. Electrical wiring and water supply/drainage pipes use quick-connect interfaces with anti-leakage and anti-freeze designs to ensure normal operation in low-temperature environments.

4. Composite Insulation Layer Technology
   Walls adopt a multi-layer composite structure: the outer layer is a color-steel profiled plate, and the inner layer is filled with polyurethane foam (density 40-50kg/m³, closed-cell rate ≥90%). Insulation material pouring should be conducted in a constant-temperature and humidity-controlled environment, secured through a combination of physical anchoring and chemical bonding to prevent cold bridges and reduce heat loss.

5. Sewage System Design
   For high-altitude low-pressure environments, sewage systems often employ negative pressure design:

   • A miniature vacuum pump generates constant negative pressure to direct waste along dedicated pipelines to collection containers;
   • Pipelines have a small diameter and flexible layout, with key control points focusing on maintaining seal integrity and precise negative pressure regulation;
   • Some systems use annular labyrinth seals or pressure balancing devices to adapt to pressure fluctuations.

6. Photovoltaic Energy Integration and Intelligent Monitoring
   Photovoltaic power generation systems are integrated to address power supply issues: photovoltaic panels are installed via custom brackets to conform to the roof's curved surface, with energy storage using low-temperature lithium battery packs equipped with intelligent charge-discharge controllers to ensure operation during continuous rainy weather. After installation, a multi-parameter sensor network (e.g., odor concentration detectors, liquid level sensors) should be deployed to collect operational data in real-time via low-power IoT modules and provide fault alerts.

7. Installation Accuracy Inspection and Environmental Design
   Upon completion, three-dimensional laser scanning should be conducted to inspect verticality deviation, joint flatness, and equipment installation positioning accuracy, along with specialized airtightness testing. Color-steel plates should use materials with a galvanized layer thickness ≥120g/m², and sewage tanks should be made of linear low-density polyethylene (crystallinity 50%-60%) to maintain toughness at -25°C, meeting environmental and adaptability requirements.