Analysis of value engineering application at the design stage of a deep excavation system

Abstract

This paper introduces a method of value engineering analysis by calculating the value coefficient of the substructure work in an office building project. Value coefficient is obtained by dividing the performance coefficient with cost coefficient, whose result shows that the retaining wall system is the main object to be developed. The retaining wall system used in the initial design is soldier pile consisting of rows of 80 cm diameter bored pile with a one-meter center to center spacing, which in each gap between two adjacent bored piles, a 40 cm diameter bentonite pile was constructed. The construction cost of the substructure generated from the initial design is Rp. 35,554,793,500.00. After implementing VE analysis, the VE team chose spun piles with 60 cm diameter (without bentonite piles) with 70 cm center to center spacing as a substitute for the initial design. The assessment performed by the VE team about the performance of the alternative indicates that there is 20.6% increase of performance compared to initial design and cost savings of 17.75%, resulting in a value coefficient of 1.22, this result is 47% higher than the initial design has, which is 0.83.