Qinghai Mobile Toilet Construction

The construction of mobile toilets in Qinghai requires comprehensive consideration of environmental adaptability, technical processes, and practical case experience to ensure stable operation of the facilities under the special conditions of the plateau.

1. Adaptability Analysis of Installation Scenarios
In Qinghai, with its high altitude, strong ultraviolet radiation, and large temperature differences between day and night, it is necessary to evaluate the ground bearing capacity, permafrost depth, and wind variations before construction. For example, permafrost may affect the stability of the foundation, necessitating the use of deep foundations or special thermal insulation treatments; strong ultraviolet radiation requires materials with anti-aging properties to prevent fading of the outer color-steel plates or embrittlement of the sealing gaskets.

2. Modular Assembly and Connection Technology
The main structure adopts modular assembly, with high-strength galvanized bolts and sealing gaskets used at connection points to balance rigidity and flexibility. During assembly, strict adherence to torque standards is required to prevent bolt loosening or stress concentration. Electrical wiring and water supply and drainage pipes use quick-connect interfaces with anti-leakage and anti-freeze designs to ensure that the pipes do not burst in low-temperature environments.

3. Composite Insulation Layer Technology
The walls adopt a multi-layer structure: the outer layer is a color-steel corrugated plate, and the inner layer is filled with polyurethane foam. The insulation material is poured in a constant-temperature and constant-humidity environment and is fixed by both physical anchoring and chemical bonding to prevent cold bridges. For example, the thickness of the polyurethane foam needs to be calculated based on the local temperature to ensure that the indoor temperature meets standards in winter.

4. Negative Pressure Design of the Sewage System
For areas without municipal sewage networks, a negative pressure sewage system is adopted. A micro vacuum pump generates a constant negative pressure, and waste is transported through dedicated pipes to a collection container. The key points are the maintenance of sealing and the regulation of negative pressure values to prevent gas leakage or pipe blockages. For example, pipe connections need to be regularly inspected to ensure there are no cracks or deformations.

5. Integrated Photovoltaic Energy Solution
In plateau areas with unstable power supply, photovoltaic panels are installed flush with the roof using custom brackets, and the energy storage device uses low-temperature lithium battery packs equipped with intelligent charge-discharge controllers. For example, the angle of the photovoltaic panels needs to be adjusted according to local sunlight data to ensure maximum power generation efficiency; the lithium battery packs need to have low-temperature start-up capabilities to adapt to environments below -30°C.

6. Intelligent Monitoring and Maintenance
A multi-parameter sensor network is deployed to monitor odor concentration, liquid level, temperature, and humidity in real-time, with data transmitted to a management platform via IoT modules. For example, when the odor concentration exceeds the standard, the ventilation system is automatically activated; the liquid level sensor indicates the cleaning cycle to optimize maintenance efficiency.

7. Installation Accuracy Inspection Methods
After construction is completed, three-dimensional laser scanning is used to detect and compare with the design model, focusing on checking verticality deviation, joint flatness, and equipment positioning accuracy. For example, the verticality deviation needs to be controlled within ±2mm, and the joint flatness error should not exceed 1mm to ensure structural stability and aesthetics.

8. Reference to Actual Project Cases
The Minhe County Urban Public Toilet Construction Project (Phase II) EPC includes one mobile toilet, equipped with a septic tank, pipeline network, electric heating, and other facilities, with an estimated contract value of 4.3882 million yuan and a service period of 60 days. This case provides cost and schedule references for similar projects.