If pilelayout is reasonable to remove the possibility of punching failure , the thickness of piled raft can be simply determined under a certain reinforcement ratio.
如果通过合理布桩可消除冲剪破坏，在给定配筋率的情况下，即可根据最大弯矩确定筏板的厚度。
2
Through the computation of ultimate vertical bearing capacity of a single pile and design pilelayout and so on, summarized experience of designation about prestressed concrete pipe pile foundation.
Therefore, not only the pile spacing but also the pile group layout will have influence on both the bearing capacity and the pile group effect of pile groups.