ABSTRACT
The increase in ultra-high rise building column intervals in recent years has meant that the direct bearing load applied to each column has increased. For this reason, the piles need increased bearing capacity and pullout resistance, and continuous underground walls are used in some cases. A diaphragm wall foundation with an enlarged part has been developed in order to achieve even greater bearing capacity and pull-out resistance. Field construction tests confirmed that with proper construction control diaphragm walls with an enlarged part can be constructed in the required shape, dimensions, and quality.
