Qinghai Outdoor Mobile Toilet Construction
The construction of outdoor mobile toilets in Qinghai needs to take into account the characteristics of the plateau environment, focusing on solving technical issues such as low-temperature freeze protection, earthquake resistance, and wind resistance. The specific construction points are as follows:
1. Adaptability Analysis of Installation Scenarios
Before construction, it is necessary to evaluate the surface bearing capacity, the depth of the permafrost layer, and wind variations. For color-steel materials, the coefficient of thermal expansion and contraction must be calculated to avoid structural deformation. Modular assembly uses high-strength galvanized bolts and sealing gaskets to ensure a secure connection. Electrical and water supply/drainage pipes use quick-connect interfaces that are leak-proof and freeze-crack resistant, adapting to the extreme plateau climate.
2. Foundation Engineering Treatment
For the permafrost layer, a composite process of 'heat pipe + replacement' is adopted: the foundation pit is excavated to 1.2 meters below the permafrost layer, a 300-millimeter-thick graded gravel cushion is laid at the base and compacted in layers (compaction coefficient ≥ 0.95), and finally, a concrete foundation is poured. This process can effectively reduce the damage caused by frost heave to the structure and ensure long-term stability.
3. Insulation and Freeze Protection Design
The wall adopts a multi-layer composite structure: the outer layer is a color-steel profiled plate, and the inner layer is filled with 100-millimeter-thick polyurethane foam (thermal conductivity ≤ 0.022W/(m·K)), which is fixed by physical anchoring and chemical bonding to prevent cold bridge phenomena. Equipment is selected with -30℃ cold-resistant materials to ensure normal operation in winter and avoid pipe freeze-cracking or equipment failures caused by low temperatures.
4. Sewage Disposal System Design
In areas without municipal sewage networks, a negative-pressure sewage disposal system is equipped: a micro vacuum pump generates a constant negative pressure, and waste is transported through dedicated pipes to a collection container. The pipes have a small diameter and flexible layout, requiring the maintenance of system airtightness and precise control of the negative pressure value. Some solutions integrate rainwater harvesting and micro-water flushing technology, with a single flush volume controlled within 500ml, balancing water conservation and hygiene needs.
5. Construction Period and Quality Control
The construction period for a single toilet is approximately 25 days, including preparation (7 days), foundation construction (10 days), module installation (5 days), system commissioning (3 days), and acceptance (2 days). Construction must comply with standards such as the 'Technical Specifications for Rural Household Toilet Renovation' (DB63/T 1775-2025). After completion, three-dimensional laser scanning is used to detect verticality deviation, joint flatness, and airtightness to ensure quality compliance.
