United States Department of Transportation
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Automatic Tools for Quick and Accurate Construction Cost Estimation for Retaining Walls
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2024-05-31
[PDF-7.43 MB]
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Edition:Final Report September 2022 – May 2024
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Abstract:Managing construction costs and budgets remains a top priority of TDOT in allocating resources provided by taxpayers. Estimating project costs accurately is critical to ensuring that projects are delivered in the fiscal year they were planned. This project developed a Retaining Wall Probable Bid Price Estimating Tool to provide accurate estimates of construction costs for diverse retaining wall types quickly. Also, the Cast-in-Place (CIP) Wall Low-Cost Design Tool was developed to optimize the design of economical reinforced concrete cantilever retaining walls. The Retaining Wall Probable Bid Price Estimating Tool was tested with data from the S.R. 115 (US-129, Alcoa) project in Knox County, TN. The Retaining Wall Probable Bid Price Estimating Tool result was 6.3% higher than the actual bid price, within ±10% of the target value. The CIP Wall Low-Cost Design Tool was applied to one of four retaining walls on the I-24 exit ramp at Bell Road in Davidson County, TN. The results of the low-cost design tool, per linear foot of the wall, reduced the cost by 26% compared to the original design. In summary, the primary project deliverables were the Retaining Wall Probable Bid Price Estimating Tool to quickly provide accurate estimates of the construction costs of various retaining walls and a companion user manual. The CIP Wall Low-Cost Design Tool and a companion user's manual were secondary deliverables.
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