Calculation sheet for 160t/32t×28m gantry crane

Compiled in accordance with: GB/T 3811-2008 “Crane Design Code” and GB/T 14406-2011 “General Gantry Cranes”.

I. Technical Parameters

1. Rated Lifting Capacity
   • Main Hook: 160t, Auxiliary Hook: 32t.
2. Span: 28m.
3. Lifting Height
   • Main Hook: 16m, Auxiliary Hook: 18m.
4. Working Class
   • Machine Type: A5, Hoisting Mechanism: M5, Traveling Mechanism: M5.
5. Operating Speed
   • Main Hoist: 2m/min, Auxiliary Hoist: 6.3m/min;
   • Trolley Operating Speed: 20m/min, Gantry Operating Speed: 20m/min.

II. Load Calculation

1. Vertical Load
   • Deadweight Load: Weight of the main beam, outriggers, and trolley (for similar models, the main beam deadweight is approximately 554.1kN, and the trolley deadweight is approximately 8kN).
   • Lifting load: Main hook 160t (1600kN), auxiliary hook 32t (320kN).
2. Horizontal load
   • Wind load: Calculated based on outdoor operating conditions, with a wind pressure of 250N/m². The wind-exposed area is determined based on the projected area of ​​the main beam and cargo.
   • Inertial load: Horizontal force generated by acceleration, calculated according to GB/T 3811.

III. Structural Design and Verification

1. Main beam design
   • Cross-sectional characteristics: Use a box beam with a cross-sectional height of approximately 1.1m. Calculate the centroid position and moment of inertia.
   • Strength verification:
     • Bending stress: σmax = M/W ≤ [σ] (allowable stress for Q235 steel: 140MPa).
     • Shear stress: τ = F/A ≤ [τ].
   • Stiffness verification:
     • Vertical static deflection ≤ Lk/800 (allowable 35mm for a 28m span).
2. Outrigger Design
   • Calculate as a rigid outrigger and verify compression-bending stability, taking into account the combination of axial force and bending moment.
3. Cantilever Verification (if applicable):
   • Static stiffness ≤ L1/350 (cantilever length dependent).

IV. Mechanism Selection and Calculation

1. Hoisting Mechanism
   • Motor Power: P = (Q·v)/(6120η), main hook power approximately 55kW (η=0.85, v=2m/min).
2. Operating Mechanism
   • Maximum Trolley Wheel Pressure: Calculated based on the load combination, approximately 227.5kN/wheel for similar models.
   • Motor Power: P = (F·v)/(6120η), where F is the operating resistance (including friction and wind resistance).

V. Stability Verification

1. Anti-overturning stability
   • Verify according to GB/T 3811 for four operating conditions (static load without wind, dynamic load with wind, etc.).
2. Foundation Verification
   • The track foundation bearing capacity must meet the wheel load requirements; a recommended foundation bearing capacity of ≥150 kPa is recommended.

VI. Other Verifications

1. Electrical System: Control voltage 48V, power supply 380V/50Hz.
2. Safety Devices: Limiters, windbreak anchors, etc., comply with GB/T 14406 requirements.