Sample Problem: Tower Crane Capacity Verification

Example

Problem Statement: A tower crane is positioned such that its maximum required reach (radius) to lift a precast concrete panel is 45 meters. The panel weighs 5,000 kg, and the rigging (cables, spreader beam) weighs 400 kg. Looking at the crane's load chart, the capacity at a 40m radius is 6,000 kg, and at a 50m radius, it is 4,500 kg. Assuming linear interpolation for simplicity between those points, is the crane capable of safely making this lift?

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Sample Problem: Temporary Facility Sizing (Space Utilization)

Example

Problem Statement: A project will have a peak workforce of 120 direct laborers and 30 management/staff personnel. Local labor laws require 1.5 m2m^2 of breakroom/welfare space per worker and 5.0 m2m^2 of office space per staff member. Calculate the total required area for temporary facilities.

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Sample Problem: Material Storage Constraints - Vertical Construction

Example

Problem Statement: A high-rise construction site in a dense urban downtown has zero laydown space at ground level. The building footprint occupies the entire lot. The contractor needs to store 50 tons of reinforcing steel and 20 pallets of blockwork for the upcoming week. The structural engineer allows a maximum temporary live load of 4.8 kPa (100 psf) on the newly poured 3rd-floor concrete slab.

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Key Takeaways
  • Crane Logistics: Always include the weight of all rigging blocks, cables, and spreader bars. The crane capacity is the gross lift, not just the net weight of the object.
  • Urban Limitations: Zero-lot-line projects require meticulously planned deliveries (JIT) because the structure itself often cannot safely support heavy, concentrated stockpiles of raw materials.
  • Facility Sizing: Temporary works must be mathematically sized based on peak manpower curves to ensure adequate welfare, safety, and administrative support.