Basic Plan for Mobile Toilets

The basic plan for mobile toilets covers stages such as construction preparation, foundation treatment, structural construction, and quality inspection. The specific content is as follows:

I. Construction Preparation Stage

1. Drawing Review: Organize technical personnel to verify foundation dimensions (6m×3m×0.5m), foundation bearing capacity (≥120kPa), and the positions of embedded parts to ensure design parameters comply with specifications.
2. Material Preparation:
   • Concrete: Use C30 P6 waterproof ready-mixed concrete with a slump of 180±20mm and a total volume of 9m³.
   • Steel Bars: Select HRB400E grade Φ12/φ8 steel bars with a yield strength of ≥400MPa and a total weight of 2.8t.
   • Waterproof Membrane: SBS 3mm polyester base, with a heat resistance of ≥90℃ and a tensile strength of ≥800N/50mm.
   • Graded Sand and Gravel: 2-4cm continuous grading, with a mud content of ≤5% and a compaction coefficient of ≥0.93.
   • Materials entering the site must pass the 'three-inspection system'. Steel bars require retesting of mechanical properties, and waterproof membranes are tested for weather resistance in batches.
3. Equipment Configuration: Equip with a forced mixer (JS500 type), an immersion vibrator (φ50mm), a laser line projector (accuracy ±1mm/5m), and other equipment, and complete calibration before construction.
4. Site Preparation: After leveling the site, excavate test pits (1.2m deep) to detect the distribution of foundation soil layers; set up drainage ditches (30cm wide × 40cm deep) and collection wells (80cm × 80cm × 100cm), equipped with sewage pumps to remove accumulated water; use a total station to locate the axis and set up 6 concrete protective piers to control stakes.

II. Foundation Treatment Engineering

1. Excavation: Use a backhoe excavator for excavation, reserving 30cm for manual bottom cleaning, with a pit wall slope of 1:0.75, a pit bottom operating surface of 50cm, and an excavation depth deviation of ±50mm.
2. Compaction: Spread in layers (250mm loose layer thickness), compact with a frog hammer, and take samples every 3 layers with a ring knife to test the compaction degree; spread a 1:3 cement slurry (5mm thick) on the surface for sealing.
3. Weak Soil Layer Treatment: For soil layers with a bearing capacity of <90kPa, use φ50mm cement-soil mixing piles (pile length 4.5m, spacing 1.2m, cement content 15%), with a 28d unconfined compressive strength of ≥1.2MPa.

III. Structural Construction Engineering

1. Steel Bar Processing: Straighten raw materials (cold drawing rate ≤4%), cut (deviation ±10mm), connect with flash butt welding, stagger joints by 50%, and lap length 40d.
2. Binding and Installation: Set C30 concrete spacers (50mm×50mm×30mm) at the bottom layer of steel bars, arranged in a quincunx pattern with a spacing of 800mm; add additional stirrups at beam-column joints and set anchor bars around embedded parts.
3. Quality Control: Use a steel bar protective layer thickness gauge for testing (deviation +10mm/-5mm) and a caliper to measure the spacing between steel bars.

IV. Quality Inspection and Acceptance

1. Process Inspection: Conduct real-time inspections of indicators such as concrete slump, steel bar spacing, and compaction degree.
2. Load Test: After the completion of foundation structure construction, conduct a load test to verify whether the bearing capacity meets the standards.
3. Comprehensive Evaluation: Evaluate construction quality based on inspection data to ensure it meets design expectations.