Operation of Time and Cost Estimation of Road and Bridge Projects

Abstract

The construction industry for Roads and Bridges in Nepal is in a transitional phase where the new technologies are recently introduced but not everyone is in access of it. The methods of works also greatly vary on the individual capacity of each contractor. So, a practical approach is necessary for developing a methodology for contract estimation. With frequent change in regulations regarding extension of time, the need for the accuracy and precision in the estimation of contract duration has even increased more.

This paper aims at developing empirical formulae to identify the relation between contract duration and the contract cost based on the data of roads and bridges completed within the last five years. A total of 83 bridges and 78 road projects were analyzed to determine a relation between the cost and the time period for these projects. Equations Where, T=  duration of work in days.

C= Cost of the project measured in lakhs was obtained For Bridges:-

 

For Roads:-

 

Time cost model is a simple yet effective way to deal with the uncertainties that comes in the procurement processes in the estimation of construction duration. This model can easily be reconstructed with new dates along the span of time. With changes in technologies and work culture, the time required for the prediction of construction duration also changes. With this model, and with proper data on construction duration and cost, the time cost model can be regenerated.