The Cost Estimation Using "Cost Significant Model" on The Structure of Beam Girderdi Development of DPU Bina Marga Bridge Province In East Java

Cost estimation is one of the construction processes to know the amount of cost for the completion of a project. The cost model on the project should be simple, easy, accurate and the results are accountable. This study is intended to find out the work affecting the total cost of bridge construction, model and cost model. Cost method realization model with the cost model used in DPU BinaMarga East Java Province.

This research chose a location in East Java area with research object of Bridge Girder Construction at DPU BinaMarga East Java Province. The data of the research was collected by using a census of development work packages in the same province of East Java whose funds sourced from APBD, from 2011 to 2014. The research data consisted of nearly equal 6 (six) job project data. Data analysis technique used in this research is using descriptive statistical analysis and inferential analysis.

Based on the calculation, there is a procurement of top and installation buildings, stone and masonry work, pavement and asphalt work, reinforcement work, foundation work, and concrete work significantly to the cost of building girder bridge, 84.72% additional cost, otherwise 15.28 % Caused by other causes, Model cost of development of the Bridge with the Model Significant Cost is: Y = 22.971.133,97 + 1,513 X7 + 1,161 X9 + 2,108 X3. A curation of significant models ranged from -10.20 % to + 6.75 %. Estimates with the Significant Cost Model resulted in better results when compared to parameters using long road parameters that have been used in DPU BinaMarga East Java Province with an accuracy ranging from -38.68 % to + 38.05 %.