Optimization of the Combination of Heavy Equipment Use in Land-Filling Work in Terms of Time and Cost in the Construction Project of Job Training Center at Ende District of East Nusa Tenggara

The Government of Ende District plans to build a Job Training Center of Ende District on an area of 2.4 hectares. The land must be firstly filled because its surface elevation is below the elevation of the road side surface. The land filling is carried out by using heavy equipment consisting of Excavators, Dump trucks, Bulldozers and Rollers. The objectives of this research are to analyze the combination of heavy equipment types and determine the minimum cost and efficient time for the construction project of land filling work on Job Training Center of Ende District. The research type is quantitative descriptive research using data sources collected based on observation, interview, and documentation methods. The observation method was used to obtain the cycle time of each heavy equipment use and the efficiency of working hours of each heavy equipment use every day. The interview method was used to obtain information for the research objectives by asking questions in face-to-face meeting between the interviewer and the informant. Moreover, the documentation method was used to get pictures or photos in the work location based on the combination of heavy equipment use. The results of the calculation found that the most effective combination based on cost and time analysis is the alternative use of a combination of 4 types of heavy equipment, consisting of 1 Unit of Excavator (12 Days), 2 Units of Dump Truck (5 Days), 2 Units of Bulldozer (1 Day), and 1 Unit of Roller (10 Days) with a total operational cost of IDR 210,679,286 and a work period of 12 days.