Ground Control Network Survey And Research Of Urban Rail Transit Engineering

Ground control network survey is the foundation work of urban rail transit engineering,also a basic work to achieve high-quality of projects. Adequate precision of ground control network is the primary prerequisite for correct implement of the other surveying work and civil construction. It provides directly assurance data to setting out and transfer survey, also provides services framework and basis to holing-through survey and finish construction survey etc.In this paper, we take ground control survey of urban transit engineering as research object, combining the engineering of Beijing Metro Line 7, detailedly discussed the technical points and job details of ground control network survey in Beijing Metro Line 7.The concrete research achievement and content includes:1. The paper systematically expatiated the main points about ground control survey,including surveying task, surveying contents, surveying characteristics. Briefly introduced the essential requirements of setting control network.2. Combined with the planning and design of Beijing Metro Line 7, we detailedly introduced the input and use of surveying instrument, utilization of available control information, data processing and overall design in ground control survey of Beijing Metro Line 7.3. In this paper, we discussed in detail including the characteristics of setting a control network, main technical target, fully essential requirements and data processing in Beijing Metro Line 7. Also we briefly introduced the repeat surveying of control network every year.4. Based on the engineering of Beijing Metro Line 7, we fully discussed and arrival at a conclusion about the question how to make full use of available information, how to reached on effective articulation with other metro line.5. We conclude some work key points in fieldwork and data processing of ground control network survey in Beijing Metro Line 7.