A Case Study of Retaining Wall using Pre-stressed High-strength Concrete (PHC) Pile for Deep Excavation Work

With increasing land prices and a lack of space in urban areas in the Republic of Korea, urban construction sites require deeper and larger excavations. For this reason, the selection of an adequate retaining wall system is becoming more important than any other aspect of excavation work. Cast-in Place pile (CIP) method, one of construction methods for retaining walls, is generally selected in excavation work for urban projects. CIP has some disadvantages such as additional waterproof work and environmental. The Pre-stressed High-strength Concrete (PHC) pile method is a solution that attempts to resolve these disadvantages of the CIP method. This study aims to compare the CIP and the PHC method in terms of cost and time. It was found that applying the PHC pile method could reduce cost and time compared to CIP by case study.