Precision Guidance Technologyapplicationin Undergroun Dengineering

This paper selects Nanjing underground river project, the project across the Yangtze River through the top tube, to build a municipal drainage works, pipe jacking project requires high accuracy, through error, there are strict controls, requiring lateral error of less than 30mm through the entire project length 800m. The author works through various underground features, relevant construction requirements and mapping specifications, etc., using the measurement adjustment basics right through the establishment of a corresponding measurement error adjustment mathematical models.Press the error distribution law, combined with the construction site conditions, through error decomposition as ground control error, shaft positioning error, the cave through error of three parts. According to the characteristics of the respective error, adopt appropriate solutions.Adjustment model for the use of ground control network optimization solver error limits to meet the requirements, and the accuracy of the analysis is to quantify the error. Contact triangular shaft positioning measurements corresponding adjustment using a mathematical model to optimize the results meet the requirements of the settlement, and Gyroscope be checked, a small difference between the two mutual proved directional accuracy. Cave guide the robot using a computer to form a combined measure of automatic guidance system, and with a high-precision wire be checked, after the error precision analysis, to meet the accuracy requirements. Elevation Transmission Shaft while also analyzed in detail, taken to the observation, after adjustment to achieve the required precision.By measuring the difference engineering theory with practice, can effectively solve complex measurement problems precision engineering, underground engineering, pipe jacking project is often difficult to ensure the accuracy of the measurement conditions are more paper to measure the adjustment theory, the actual measurement environment is analyzed through the bars of the complex is decomposed in the decomposition error after take targeted optimized to achieve high accuracy, precision-oriented technical feasibility of underground engineering is to prove one by one.