Establishment of Construction Measurement Coordinate System for Pumped Storage Power Stations based on Virtual Projection Center
The construction area of the pumped storage power station project is small and the height difference is large.The conventional construction control network of the pumped storage power station is a free network established by selecting an elevation plane near the av-erage elevation of the key structures.Due to the large height difference of the project,conventional methods can only ensure that the cal-culated deformation of some key areas is smaller than 25 mm/km,and cannot guarantee that length deformation values of all key areas meet the specification requirements.To solve the problem of overrun of length calculation deformation and reduce the influence of length calculation deformation on the accuracy of engineering construction measurement,a method for establishing the construction measurement coordinate system of pumped storage power station based on virtual projection center is proposed by analyzing the length deformation of the coordinate system of conventional construction control network.The application results show that this method can effectively eliminate or alleviate the influence of control network results on the measurement errors of water transmission and power generation system,and effec-tively coordinate the results of the survey and design stage with the construction stage.Meanwhile,it can meet the requirement that the length reduction deformation of the pumped storage power station with a height difference of about 640.00 m is not exceeding 25 mm/km,and the method is of certain promotion value.
pumped storage power stationsconstruction control networklength reduction deformationmain construction elevation surfacevirtual projection center
万方数据
维普
