Abstract
The finish work on high-rise residential buildings is performed simultaneously with mechanical and electrical construction work, which results in frequent work interference and delay. This significantly hinders efficient schedule management. Critical Path Method (CPM) is inefficient when applied to high-rise residential building projects in which work is repeatedly carried out for each floor. Line-of-Balance (LOB) is widely used for its effectiveness in managing repetitive work. LOB was developed into TACT and eTACT (enhanced-TACT) to combine heterogeneous works continuously. In particular, the eTACT schedule management method has an advantage in that it is capable of systematically connecting detailed construction, mechanical and electrical construction projects using a work planning template. This study evaluates the time reduction effect of the eTACT method for a high-rise residential building. A comparative analysis of data on 102 cases of non-applied projects and 44 cases of projects using the eTACT method over a period of 10 years is presented to verify its effectiveness. The result shows that finish work time was reduced by 25% or about 53 days on average.
Highlights
Most high-rise residential buildings are constructed on each floor or in zones which have similar floor plans
This study evaluates the time reduction effect of the eTACT method
The top floor finish work duration applied with the eTACT method for 10 years was 153 days on average and 206.2 days for the non-applied cases
Summary
Most high-rise residential buildings are constructed on each floor or in zones which have similar floor plans. As the repeat count increases, the waiting time due to work interference will increase (Al-Momani 2000) For this reason, various studies have been conducted with Critical Path Method (CPM), Line-of-Balance (LOB) and other methods (Suhail, Neale 1994; Yamín, Harmelink 2001; Arditi, Albulak 1986). For efficient scheduling of high-rise residential buildings, resource levelling is necessary (Cho et al 2013) To this end, TACT and eTACT methods that combine LOB, value stream analysis and the new scheduling concept of Lean Construction are being studied (Kim et al 2003; Suh et al 2003). The enhanced-TACT (eTACT) method was applied to high-rise residential buildings, and the data on construction time were collected. The data of work duration on highrise residential buildings applied with the eTACT method and those not applying the method within the same firm are compared to verify the time reduction effect
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