Cost Reduction of Truss Type Roof Truss Installation

Abstract

The objectives of this research were to: 1) to reduced costs incur in the installation of reducing of trusses installing, 2) to improved work processes to be more efficient y applying Lean's approach In practice, MUDA theory and 7 WASTE were overproduction, waiting, unnecessary movement (transporting), unprofitable work (inappropriate processing), excessive inventory (unnecessary inventory), unnecessary motions, and defect in order to work efficiently. Then compared the information before and after revision.

The results of this study indicated that: 1) after studying, analyzing and improving the working process, the cost of installing the roof truss per area was reduced (Unit per square meters). Project I had installation cost for truss type roof trusses 194.43 baht per square meters. Project II had installation cost for truss type roof trusses 89.91 baht per square meters. It showed that cost was reduced for 104.52 baht per square meters, accounting for 53.76 percentage.  Or calculated as reduced cost from Project I to 74,780 baht, accounting for 30.3 percentage. 2) Completed time for installation was reduced for 795 minutes or 1.66 days, accounting for 25.4 percentage. Consequently, work was completed successfully within 4.86 days as planned (5 days) without overtime work. This way could reduce cost when comparing the ratio of the area of ​​project II. The area was greater than 643.91 square meters, accounting for 33.66 percentage. In addition, the weight of the steel frame was greater than 13 tons, accounting for 34.21 percentage. Even though it was using to lift the building floor 72 times, it could be reduced waste. It could be actually reduced the time of installing of trusses it so true. It has resulted in a lot of efficiency and productivity within the organization. Whether it was about a faster time, quality inspection of workpieces before installation, collecting details of the workpieces, editing workpieces conveniently, quickly and it will have also reduced the risk of working at heights.