Installation of Mobile Toilets at Linxia Intersection

The installation of mobile toilets at the Linxia intersection should follow a modular design process, with the following specific steps:

1. Foundation Treatment Ensure that the ground is solid and level, with a slope of less than 5 degrees, and conduct a compaction test to prevent uneven settlement. Given the significant temperature variations in the Linxia area, pipelines should be equipped with insulation layers (such as polyurethane foam) to prevent freezing and cracking in winter. If the foundation consists of soft soil or backfill, replacement or compaction treatment should be carried out to ensure that the bearing capacity meets the requirements.

2. Main Structure Installation

   • Chassis Positioning: Use a forklift or manual labor to place the prefabricated steel chassis (including the sewage pipe connection flange) steadily, and adjust it to a level state using a level gauge, with an error not exceeding ±2mm.
   • Frame and Wall Panel Assembly: Install the columns, transverse support beams, and floor framework in sequence. The connection points should be fixed with galvanized bolts (the torque values should comply with design specifications). The wall panels (aluminum alloy composite panels or fiberglass panels) are fitted into the frame through slots, and waterproof sealing strips (such as silicone sealant) are embedded at the edges to prevent leakage.
   • Roof Installation: The single-slope roof module is installed last. The ventilation ducts are connected to the reserved holes in the wall panels using flexible hoses and secured with stainless steel clamps to ensure airtightness.

3. Internal Facility Connection

   • Install fixed components such as stainless steel squat toilets, plastic water tanks, and mechanical exhaust devices, and connect them through standardized interfaces (such as DN50 pipe diameter).
   • The connection of water and electricity pipelines should use quick-connect fittings (with rubber seals inside). After connection, a pressure test should be conducted (water pressure of 0.6 MPa, with no leakage for 30 minutes under pressure).

4. Functional Debugging and Inspection

   • Conduct a flushing test (single flush volume ≤ 3L), a circuit inspection (insulation resistance ≥ 0.5 MΩ), and a leak-tightness inspection (smoke detection to ensure that the ventilation system has an air exchange rate of at least 40 times per hour).
   • For biodegradable equipment, microbial inoculants (such as Bacillus composite bacteria) should be added. For vacuum collection equipment, the tightness of the sewage storage tank should be checked (negative pressure test at -0.05 MPa, with no leakage for 10 minutes under pressure).

5. Special Environment Adaptation

   • The cabinet material should have an anti-ultraviolet rating (such as UV400), and the surface coating thickness should be ≥ 80μm to resist strong ultraviolet rays at high altitudes.
   • The sewage system should adopt a low-temperature-adaptive design (such as electric tracing insulation), and the strength of the wind-resistant fixing devices should comply with the local maximum wind speed records (for example, the design wind speed in the Linxia area should be ≥ 30 m/s).

Precautions: The installation team should hold special equipment operation qualifications (such as lifting operation certificates and electrician certificates). The contract should clearly specify the fault response time (such as ≤ 4 hours) and the spare parts supply cycle (such as ≤ 24 hours). The modular design allows for the complete disassembly by a single person within 4 hours, and the component volume can be compressed to 40% of the in-use state during transportation.