arch center
3.Combined with the station of Chongwenmen of 5th line of the underground in Peking,it introduces the technology and program of building single-arch large span station using the methods of bury shallow and dig invisible of the method of digging in center,making piles in the holes and the method of CRD assistant. Through the field survey,its surface sedimentation and the structure sedimentation meet the need of safety,and the project is few to see,accumulate the experience to the similar projects.
4.Abstractpointed out the main problems existing in determining the basic structure of support,the paper gaveout the methods and formula that may be used to calculateall the parameters both rapidly and accurately for supports when the center angle facing the crown of arch, the ratio of initial net width and height of archer are known.
