Abstract: With the rapid development of the economy and the fast increase of the urban population, the issues in the urban constructions are consequently and frequently encountered. The urban construction sites are becoming more and more confined, the surrounding environments are also complicated and variable during the construction periods. The interfaces of different construction sequences and procedures are discussed in the paper. The challenge goal of complete the entire construction work within the tight schedule without compromise the quality by controlling the smooth flow of different construction procedures are evaluated. The key issues and critical points in the deep excavation supporting system and piled foundation construction are analyzed in the paper. The methods of optimizing the construction and measures for resolving the frequently encountered problems are also provided in the paper.

Key words: pile foundations, deep excavation supporting system, cross constructions, construction technology, key issues in the construction