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Calcimator

Erection Sequence Calculator

Plan precast erection: estimate crane picks per day, total erection days, crew size, and project cost.

Inputs

lbs
lbs
min
hrs
%
$/hr
$/hr

Results

Picks per day

9

Total erection days6 days
Min crane capacity22,500 lbs
Crew size6 persons
Crane cost$16,800.00
Labor cost$24,480.00
Erection cost$41,280.00
Cost per panel$826.00
Mob/demob estimate$10,000.00
Total project cost$51,280.00
Crane utilization92.6%
Cost Per Pick$825.60
How to Use This Calculator
  1. Enter the total number of precast panels and the average and heaviest panel weights in lbs.
  2. Set the cycle time per crane pick in minutes (including set, plumb, and weld) and work hours per day.
  3. Enter the weather/delay factor (%) and the crane hourly rate and ironworker burdened labor rate.
  4. Read Picks per Day and Total Erection Days to set your schedule.
  5. Check Min Crane Capacity (lbs) — this is the heaviest piece times 1.25 and sets the minimum crane size.
  6. Review Erection Cost, Labor Cost, and Total Project Cost for budget planning and subcontractor negotiation.

How the result changes with Cycle time per pick

Cycle time per pickPicks per day
2616
528
835
1103

What each input means

Total panels/pieces
Total number of precast pieces to erect.
Average panel weight
Average weight per precast piece.
Heaviest panel weight
Weight of the heaviest piece (determines crane size).
Cycle time per pick
Average time per crane pick including set, plumb, and weld.
Work hours per day
Productive work hours per day.
Weather/delay factor
Estimated percentage of time lost to weather/delays.
Crane hourly rate
All-in crane rental rate per hour.
Labor rate per person
Burdened labor rate per crew member per hour.

What each result means

Picks per day
Number of precast pieces that can be set per day.
Total erection days
Calendar work days to complete erection.
Min crane capacity
Minimum crane capacity (heaviest piece × 1.25).
Crew size
Recommended erection crew size.
Crane cost
Total crane rental cost.
Labor cost
Total erection labor cost.
Erection cost
Combined crane and labor cost.
Cost per panel
Average erection cost per panel.
Mob/demob estimate
Estimated crane mobilization and demobilization cost.
Total project cost
All-in erection cost including mob/demob.
Crane utilization
Crane utilization efficiency.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Total panels/pieces = 50, Average panel weight = 12000, Heaviest panel weight = 18000, Cycle time per pick = 45 = 8 input(s) provided
  2. Calculate Picks per day
    Picks per day = max(1, picksPerDay)
    9 = 9
  3. Calculate Total erection days
    Total erection days
    6 = 6
  4. Calculate Min crane capacity
    Min crane capacity = heaviestPanel * 1.25
    22500 = 22500

Engine last updated .

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