Means and Methods (Breadth)
Scope
Means and methods covers how work is physically executed: excavation and support, dewatering, formwork and shoring, scaffolding, cranes and rigging, compaction, pile driving, concrete placement, and temporary works. The contractor generally selects means and methods, but the designer must review temporary works that affect permanent work or safety.
Key concepts
Excavation support may be sloped, benched, shored, or shielded. Dewatering includes sumps, wellpoints, and deep wells; check drawdown effects on adjacent structures. Formwork is designed for lateral concrete pressure, which depends on placement rate, temperature, and slump-not just hydrostatic head. Crane capacity falls as radius and boom length increase. Rigging and hook-block weight must be deducted from gross capacity to get net capacity. Compaction equipment matches soil: sheepsfoot for cohesive soils, vibratory for granular.
Traps
Gross versus net crane capacity; working beyond the chart radius; side loading. Swell, shrinkage, and compaction factors applied backwards. OSHA soil classification is not the same as USCS classification. Formwork design loads differ from permanent-structure loads. A trench box must be sized for the excavation and installed per tabulated data.
Worked example
100 bank cubic yards (bcy) of soil with 25% swell becomes 125 loose cubic yards (lcy). If the same soil shrinks 10% when compacted to the specified density, it occupies 90 compacted cubic yards (ccy). Haul tickets are in lcy, payment is in bcy or ccy, and the units must never be mixed.