ANALYSIS ON SCHEDULING ACCELERATION FOR CONSTRUCTION PROJECT OF WEST SUMBA BAPPEDA BUILDING USING TIME-COST TRADE-OFF METHOD

Abstract

The construction project of West Sumba BAPPEDA (Development Planning Agency at Sub-National Level) Building, in the fiscal year of 2016, is located at Weekarou Street in Loli Sub-District of Waikabubak City of West Sumba District (East Nusa Tenggara) and is according to construction agreement contract No 04/PPK-LELANG/BAPP/2016 dated June 24, 2016 with a contract value of IDR 3,415,700,000. The construction project of West Sumba BAPPEDA Building began on June 24, 2016 with a completion time limit of 180 days. The deadline for project completion is on December 20, 2016. Until the 5th week of the second month, the implementation of the project experiences delays that were caused by a lack of workforce. Due to the deadline for the scheduling plan, the construction project must complete all work. Therefore, the government issued an addendum for adding 50 days of project completion time. Based on these problems, the scheduling time acceleration plan needs to be reviewed. The scheduling acceleration of the construction project of West Sumba BAPPEDA Building is conducted by adding workforce to acceleration activities that have the lowest cost slope using the Time-Cost Trade-Off (TCTO) method. The scheduling is conducted using Gantt chart in the Microsoft Project scheduling application. The process of scheduling acceleration is carried out through 4 acceleration processes based on the types of activities that are on the critical path and have the lowest cost slope value. The results of scheduling acceleration are stopped in the fourth duration of the acceleration process because acceleration process has fulfilled the target with a total of 177 days ≤ 180 days and costs of IDR 7,034,600 from the normal duration of 201 days and costs of IDR 5,939,600. It obtained an additional acceleration cost from the normal duration as much as IDR 1,095,000. The scheduling acceleration using the Time-Cost Trade-Off (TCTO) method is carried out by adding a workforce of 24 days from the normal project schedule of the 201 to 177 calendar days. The total additional cost is IDR 14,871,462 from the planned cost according to the contract of IDR 3,105,189,408.66 to IDR 3,120,060,870.66.

Keywords

• Cost
• critical path
• scheduling
• time acceleration