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2.6 Disadvantages of top-down construction:-
Excavation under the slab is so risky and so difficult. It may be a strain of workers since working conditions are difficult. If any unexpected ground conditions such as buried foundation or difficult soil layers to work with are encountered, then excavation becomes difficult. After completing the concreting of floors, further excavation canno t be started immediately. Soil cannot be removed before b efore slab attains the required strength. Earth moving operation is slower than the conven tional methods.
