The analysis of time-cost changes in planning of construction projects by network diagrams in technology use origin

Abstract

In rapidly developing World, not only feasibility and technical implementation but also planning and cost management effort shaves an increasing importance. In this study, varied cost-planning construction procurement of housing development Project carried out by Prime Ministry Development (TOKİ), was investigated. For this purpose, work program was prepared based on the contractual time of Project which has quantity and estimation and by using network diagram. After that, alternative CPM planning was obtained by reducing different proportion of time. Reducing of time edited according to the basis of new technological applications. For each alternative Project plan, monthly manufacture and ration costs were calculated, base Project has been moved to the date of delivery by net present value (NPV) method. Additional costs to be brought by Project time reductions were reflected as costs of technology and also saving amount scores corresponding to unit reduction time were determined to be equal to reduce general expenses. As a result of study; it has been determined that the completion of the project in 18 months' time specified in the contract and corresponding to the most appropriate time economically is the most appropriate solution. The authors emphasize that; prior to the procurement of medium and large scale construction projects, performing time-cost studies has a key attribute for optimum solutions both national and construction companies, because performing time-cost studies provides minimum cost of production.