CONSTRUCTION PROJECT WASTE IDENTIFICATION: CASE STUDY ON A BUILDING CONTRACTOR

• Main Author: Made Bayu Purnama, I
• Format: Theses
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/57209
• Institution: Institut Teknologi Bandung

The waste in this construction was quite difficult to identify and eliminate because a construction project had a high complexity of work. In addition, because a construction project had a unique nature. One project to another must have differences, causing learning from each project to be mandatory for evaluation and improvement in the next project. This waste could come from human resources, machines, methods, and materials. In general, there are seven wastes, namely in the form of overproduction, waiting, defects, inventory, motion, transportation, and process. PT. XY had tried to adopt the lean construction concept and several tools to prevent or reduce waste and these tools had been tried to be applied to ongoing projects. From the identification of waste that occurs, it turned out that the waste that tends to occur with the waste assessment model method on building projects at this company is defect with 33.39%, motion with 16.56% being the second, the third is overproduction with 12.56 %, the fourth is waiting at 11.74%, the fifth is transportation at 10.41%, the sixth is process at 9.94%, and the last is inventory at 7.27%. Meanwhile, the relationship between waste, defect, and waiting had a value of 20.2% for waste that affects the occurrence of other wastes and defects got a value of 22.9% for waste that was influenced by other wastes. The results of the fault tree analysis got the results of defects consisting of 3 parts, namely design defects, material defects, and product defects with their respective root causes. Design defects were caused by delays in the design from the designer. The design was not final because it was waiting for an agreement from the owners (more than 1 owner). During the work, there was a change in the initial design. There was a request for additional work from the owner, and there were obstacles in the field so that the design must be changed. Material defects were caused by damage to materials whose protective coverings were peeled off due to frequent passage by workers, handling equipment needed repair or updating of tools, incompetence of operators from machine handling users so that material damage could occur. Product defects occurred due to changes in design and specifications from the initial plan and a mismatch between the plan and work in the field. .