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Additional resources for The Civil Engineering Handbook, 2nd edition
The flexibility left to the contractor in choosing methods creates interest in bidding the project. The means and methods of work are the primary ways that contractors achieve competitive advantage. This flexibility challenges the contractor to develop a plan and estimate for the work that will be different and cheaper than the competition’s. Risk — The contractor must also evaluate the myriad of potential problems that might be encountered on the project. These risks can include the following: • • • • • • • • • • • • • • • • Material and workmanship requirements not specified Contradictory clauses interpreted incorrectly Impossible specifications Unknown or undiscovered site conditions Judgment error during the bidding process Assumption of timely performance of approvals and decisions by the owners Interpretation and compliance requirements with the contract documents Changes in cost Changes in sequence Subcontractor failure Suspension of work Weather variations Environmental issues Labor and craft availability Strikes and labor disputes Utility availability This list represents a sample of the risks, rather than an inclusive listing.
Walker, Lisle, IL. Means Building Construction Cost Data. S. Means, Duxbury, MA. Estimating Earthwork Quantities. Norseman Publishing, Lubbock, TX. Caterpillar Performance Handbook, 24th ed. Caterpillar, Peoria, IL. Means Man-Hour Standards. S. Means, Duxbury, MA.
80 yd 3 Example 13 It is necessary to place 90 cubic yards of concrete. Site conditions dictate that the safest and best method of placement is to use a crane and a 2-cubic-yard bucket. It is determined that to perform the task efficiently, five laborers are needed — one at the concrete truck, three at the point of placement, and one on the vibrator. It is assumed that supervision is done by the superintendent. 00/h. Time needed: Setup Cycle: Load Swing, dump, and return TOTAL © 2003 by CRC Press LLC 30 min 3 min 6 min 9 min 1-22 The Civil Engineering Handbook, Second Edition No.