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Design and Construction of Driven Pile Foundations – Lessons Learned on The Central Artery/Tunnel Project

Chapter 5. Cost Dataof Driven Piles

This chapter presents a summary of the costs associated with pile driving operations on the CA/T project. The costs presented in this report were obtained directly from the contractor and represent the contractor's bid estimates identified in the individual contracts. The primary purpose of the cost data is to document the approximate cost of pile driving on the CA/T project; however, the data may also be useful to design engineers for planning purposes.

The contractor's bid costs for pile driving are summarized in table 13 by pile type. Unless noted, the costs in table 13 do not include costs for preaugering or costs associated with the mobilization or demobilization of the contractor's equipment. Steel pipe piles had the highest unit costs, ranging from $213 per meter for the 81.3-cm pile to $819 for the 154.9-cm pile. Unit costs for the PPC piles were lower, ranging from $72 to $197 per meter for the 30-cm PPC piles and $95 to $262 per meter for the 41-cm piles. As one would expect, the unit costs tended to decrease with the increasing size of the contract. The contractor's bid costs for preaugering are summarized in table 14. Preaugering was not performed in contract C07D1, and preaugering costs were not identified in the contract C07D2 bid. As shown in table 14, the additional cost of preaugering ranged from $33 to $49 per meter.

Notes:

1. Unit costs include the costs of materials and labor for pile driving only. Preaugering is not included unless otherwise noted. See table 14 for preaugering unit costs. Mobilization and/or demobilization costs are not included.

2. Unit costs include the costs of preaugering.