6.6. CONCRETE FOUNDATIONS



6.6.A. Estimate/Plan/Track/Control - Bulk concrete

A multi-purpose EMMA can be used for any 'bulk' activity, involving a physically measurable unit of construction work scope that is quantified in tens, hundreds or thousands. For example, large earthmoving or excavation works; the installation of underground piping systems (eg drainage or water reticulation); a network of roads & paving; concrete foundations & structures; buildings & finishes; or boundary security fencing, to name a few.

 

The EMMA comprises 3 'pages', namely 'INPUT' (Basic data that must be inputted in order for the EMMA to function), 'TABLES' (Spreadsheets for inputting target & actual progress percentages, manhours etc), and 'CHARTS' (Where inputted speadsheets are presented as S-curves & histograms). The EMMA can be used:

  • to set up a target rate of progress (S-curve);
  • to set an estimate of man-hours, converted to manpower requirements (histogram);
  • to record units measured as complete each month;
  • to record man-hours consumed each month, thereby automatically comparing the actual rate of progress and actual usage of manpower, with planned rates.
  • furthermore, unsatisfactory trends can thereby be identified and work re-scheduled, along with automatic revisions to manpower requirements, that will lead achievement of target completion.

Initial requirements for inputting are:

  • the estimated total quantity;
  • definition of the unit (eg m3);
  • an estimate of man-hours required per unit;
  • the average number of hours to be worked each day;
  • the average number of days to be worked each week.

Thereafter, inputting should be in accordance with notes provided. NOTE: For the EMMA to work, values must be inputted to all lines in Sheet 2 TABLES, from Month 1.

Use of an EMMA will be of particular interest to anyone with responsibility for getting a work scope package completed on or ahead of schedule. 

 

 

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6.6.B. Individual foundations - Manhours + cost

This calculator (scroll down) will require reference to the following chart in order to input a manhour rate per cubic measure of foundation concrete. For example, a 7 cu yd foundation will require +/- 14 manhours per cube (ie Total 98 manhours).

EXAMPLE - An 18 yd3/m3 foundation will take +/- 11 manhours per cube to construct.
EXAMPLE - An 18 yd3/m3 foundation will take +/- 11 manhours per cube to construct.

CALCULATIONS - Input the description of a foundation if required, followed by the main dimensions (ft or m - For approx estimating the differences are marginal) Having automatically calculated the volume, read off a manhours per cube rate from the above chart and input as shown.

EXAMPLE - A foundation 4ft x 5ft x 6ft will require 4 cu yds of concrete @ approx 16 manhours per cube = +/- 70 hours.

Input a manhour cost rate if required. Repeat for more individual foundations if required.

 

For a hypothetical example, click Real time sync at foot of tabulation, enter secret key 'individual' and click connect.

NOTE: Manhours per unit volume calculated above for individual or one-off foundations are likely to be greater than those used for multiple foundations following, due to repetitive work generally being more efficient.

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6.6.C. Multiple foundations - Quantities + manhours + cost

Note: In the column headed "Insert quantities", enter numbers of pipe supports, pumps, vessels etc in the listed categories. Widths, lengths and depths of foundations are indicative only, but for greater accuracy, if desired, the User can also change dimensions given in feet (automatically converted to metric), to reflect a 'real' situation. Total manhours will be calculated. Thereafter, Sheet 2 can be used to create a target S-curve and manpower histogram, with the facility to plot actual progress and manpower usage, thereby to highlight where manpower appears to be insufficient for the schedule to be met.

For a hypothetical example, click Real time sync at the foot of the tabulation, enter secret key 'multiple' and click connect.

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