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Improvement of Underground Wall Design and Construction Safety Using Mega Double Wall Construction Method

Underground wall construction that is an under-the-frame construction constituting the skeleton of a building, involves a construction with a high outer wall, poor working environment, and high safety risk. A conventional formwork method exists for such construction. The existing method requires several technicians working in different areas such as scaffolding, rebar construction, formwork construction, and concrete casting construction. In addition, it requires longer construction periods with higher risk of accidents and deterioration in the quality. To overcome such drawbacks, in this work, mega double wall construction method that involves a factory-made precast form, has been used for the initial design stage after discussions between the client, designer, and builder. This method reduces the number of required technicians and construction period, lowers the risk of accidents, and improves the quality, and is a result of introducing the concept of design for safety at the early design stage. In the future, it is necessary to introduce the concept of design for safety not only for underground wall construction, but also for finishing work, thus, allowing for safer overall construction.