engleski

Method for Early Base Estimation of Construction Time for Linear Projects

Even though linear infrastructure projects have low complexity schedules, they are still not successful in meeting planned deadlines. The deadlines are mostly based on planning done in early project development when limited data are available. Developed models for early time estimations found in literature rely on few variables and, almost in all cases, one of them is estimated cost. This presents a problem because early cost estimations can significantly deviate from contract price and thus lead to unreliable time estimation. Most of the models found relates to high-rise buildings and linear projects are less represented in the literature of early time estimation. The purpose of this paper is to develop the method for early estimation of construction time for linear projects with repetitive activities which does not rely on estimated cost. This research is done on one large sewer system project. In case study we showed how to determine the small number of leading repetitive activities which stretches along the pipeline route. Then we elaborated algorithm for time calculation of activities in linear schedule method (LSM) which directly links durations of activities with quantities and estimated production rates. Developed method is based on project leading activities and algorithm and we showed an example of how to estimate the time by using this method. Limitation of this method is that it can be used only for base estimation. Further research needs to be done to develop method into a model and to include uncertainties and risks.

construction time estimation ; linear infrastructure projects ; method ; deadline

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