Tongchuan Outdoor Portable Toilet Installation

The installation of outdoor portable toilets in Tongchuan should adhere to the modular steel structure integrated design specifications, with a focus on controlling the two key aspects of foundation construction and main structure installation. The specific points are as follows:

I. Foundation Construction

1. Site Survey and Treatment

   • Bearing Capacity Requirements: Before construction, the site bearing capacity should be measured to be ≥150kPa. If the soil is collapsible loess, lime-soil replacement treatment is required. Use 3:7 lime-soil for layered compaction, with each layer being 25cm thick and a compaction coefficient ≥0.93. The replacement depth should be no less than 80cm to eliminate foundation collapsibility.
   • Drainage System: Set the site drainage slope to 2%. Excavate drainage ditches around the perimeter measuring 30cm×40cm. Use M7.5 cement mortar to build MU10 brick ditches, and lay a 10cm thick layer of gravel filter material inside the ditches to ensure rapid drainage of rainwater and prevent water accumulation from eroding the foundation.

2. Foundation Pouring

   • Concrete Grade and Reinforcement: The foundation concrete should be of grade C30, with anti-crack steel reinforcement mesh (Φ8@200 bidirectional) inside to enhance anti-crack performance. The foundation size should be determined according to the module specifications, with a standard foundation for a single module being 1.8m×1.2m×0.3m.
   • Embedded Part Requirements: Embedded parts should be made of Q235 steel plates (10mm thick), with hot-dip galvanizing treatment on the surface to prevent corrosion. The anchor bars should be 4Φ12×300mm, firmly welded to the steel reinforcement mesh, with a position deviation controlled within ±10mm.
   • Curing Measures: After concrete pouring, cover and cure for ≥7 days. In winter construction, insulation measures should be taken (such as covering with cotton quilts or electric blankets) to ensure that the surface temperature of the foundation during curing is not lower than 5°C and to prevent frost damage.

II. Main Structure Installation

1. Frame Assembly

   • Support System: Use full-house scaffolding for support, with upright spacing ≤1.2m, bottom horizontal tubes 20cm from the ground, and bidirectional horizontal scissor supports set up to ensure frame stability.
   • Bolt Connections: Use M12 high-strength bolts (grade 8.8) for component connections, with a torque value controlled between 45-50N·m. Each node should have no fewer than 4 bolts, with 2-3 threads exposed to ensure connection strength.
   • Verticality and Axis Control: The verticality deviation of frame installation should be ≤H/1000 (H is the column height) and no more than 15mm. The plane axis deviation should be controlled within ±5mm to ensure overall structural accuracy.

2. Module Assembly

   • Lifting Equipment: Select a 5-ton truck-mounted crane for module lifting to ensure safety and efficiency.
   • Material Requirements: The main structure should use a Q235 galvanized steel frame, with 40mm thick metal carved panels for the walls, integrated environmentally friendly panels for the interior decoration, and anti-slip marble for the floor, balancing durability and aesthetics.
   • Supporting Systems: Equip with a biodegradable treatment system and intelligent sensing devices to enhance environmental performance and user convenience.

During the installation process, strictly adhere to design specifications to ensure material quality and construction accuracy, thereby guaranteeing the long-term stable operation of the portable toilets.