In the remodeling underpinning, Connection between pile and footing is very important considering load transfer aspect. In this paper, the 3type construction cases of connection is introduced.

For pile construction of underground extension in the remodeling, existing piling method have limitations. These method can't access the restricted area and construction period must be delayed by many piling steps. To overcome these defects of existing method, SAP method is developed and gained the NET(No.684). Also, SAP method applied in remodeling site of Chung-Dam Dong 00 APT.