Collaborative design is a significant method to improve the efficiency of complex product development. In order to reinforce the update and synchronize mechanism of the collaborative working environment, relational design techniques are studied. Taking airplane wing as an example, the relations in product design, manufacturing and measurement stages are analyzed and classified into three types: datum reference relation, parameter relation and non-geometric relation. Then the creation and update methods of the relations of each type are discussed respectively, and they are summarized to a uniform user operation pattern. Finally, a relational design tool is developed and applied in a case study, which validates the feasibility of our methods.

In recent years, the construction industry shows a rapid development in China. The amount of high-rise buildings continually increases, and in the meanwhile, the technical requirements of construction gradually increase, especially in deep foundation pit support construction technology. At present, there exist a large number of high-rise buildings in China. The working face of foundation engineering is becoming smaller and smaller, while the foundation pit is getting deeper and deeper. In order to ensure the quality of construction projects, the deep foundation pit support construction technology should be continuously improved. This paper analyzes the current status of deep foundation pit support construction, and the past studies and researches about the supporting technology of deep foundation pit. The conclusion of this paper is expected to provide some help for the construction enterprises.