To particularize the implementation of the concurrent process planning systems, and put forward the functional requirements and architecture of product manufacturability evaluation.

详细并 行工艺设计系统实现方法，提出产品可制造性功能要及其体系结构。

Based on practical example,the authors of this paper particularize the method how to deal with the crevice and give some suggestions to prevent it.

结合工程实例,详细预应力管桩缺陷部分机理和方法,并从施工角度给出合理预防裂缝出现建议。