COST AND TIME STUDY OF KNOCK DOWN FORMWORK

PALAYUKAN, CHRISTIEN PRATIWI (2017) COST AND TIME STUDY OF KNOCK DOWN FORMWORK. S1 thesis, UAJY.

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Abstract

COST AND TIME STUDY OF KNOCK DOWN FORMWORK, Christien Pratiwi Palayukan, Student ID Number 13.13.14916, 2017, Construction Management, International Civil Engineering Program, Civil Engineering Department, Faculty of Engineering, Universitas Atma Jaya Yogyakarta. Formerly, formwork was only made by plywood and timber, also known as conventional system formwork. However, conventional formwork is considered inefficient in term of time and price. Not only takes long time to fabricate the formwork, but conventional formwork also result many wastes since conventional formwork can only be used for maximum two times. So this became an important issue in construction industry. Therefore, many of new formwork innovations came up to overcome this issues, one of the innovations is knock down formwork. Knock down formwork made of steel plate or specific plywood and hollow iron. However, there might be some engineers have lack information about knock down formwork. Therefore, it is needed to discuss about the cost and time of knock down formwork compare to conventional formwork. Furthermore, the engineer can choose which formwork is compatible for their project, by considering the cost and time aspects. In this case, knock down formwork was observed in Malioboro Park View Apartment project, while conventional formwork was observed in Kencana Shop and House project. The data collection was done for on-going building project. The data collection was divided into two, time study and cost study. The data for time study of knock down and conventional formwork was done directly in construction site by measuring the duration to finish one formwork installation by using stopwatch with accuracy of 0.01 seconds. The data for cost study of knock down and conventional formwork was done directly in construction site by observe the amount of workers and materials used to finish one formwork installation. After that, those data were analyzed and calculated using some formula then finally got the productivity, workers and material coefficient, and the unit price. Based on the time data analysis, knock down formwork is 11 minutes and 5 seconds faster than the conventional formwork for 1 m2 formwork installation. Furthermore, based on the cost data analysis, knock down formwork is Rp.245,085 more expensive than conventional formwork. Based on the result obtained from the observation, the writer conclude that the knock down formwork is more efficient to use for high rise building rather than conventional formwork. Despite the expensive price, the formwork can be used for multiple times (more than 30 times) so it is still cheaper if compared to conventional formwork that only can be used maximum 2 times (depends on its condition). In time aspects, the installation of knock down formwork is also faster than the conventional formwork. Because the making of formwork is only done once and used continuously during the project construction.

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