Research On Iocation Control Of GPS In High-rise Building Construction

The transforming of survey datum and the control of axis, vertical level, elevation are of great importance on controlling quality of high-rise building construction. In order to maintain project quality and construction efficiency, to improve the efficiency of survey location and observing precision, also to explore the more scientific and faster method in survey location of constructions, this dissertation systematically elaborates the base principles in using GPS technology on high-rise building construction, putting forth the base method in the design of technology, operation, data processing, and error analysis etc, when GPS technology is used in high rise building construction. And then it is proved by using this technology in the project of Construction Bank building of Xiamen. This dissertation expounded the coordinate system and time system, and discussed the method of the satellites' relative location and dynamic location. On this basis the coordinate system, time system of high-rise building constructions' location and the method of location in high-rise building construction is verified. Research on technology design's foundations of high-rise building constructions' GPS location survey including GPS survey's norms, GPS survey's task items was carried out. Besides, the basic design, the constitution and graphic design of GPS network is discussed. It was suggested the GPS datum marks can be placed inside or outside the buildings. Also it was given the picture of base survey network constituted by datum marks, and the principle that GPS survey be obeyed in high-rise building construction. The fieldwork of GPS location in high-rise building construction includes the choice of GPS mark, the choice of operation mode, and the remanding of survey etc. Before the points are selected we should collect and try to understand the position and the original survey control mark's situation about high-rise building, so we can decide the suitable marks. The adoptable operation mode of GPS location in high-rise building construction mainly are static locations and dynamic locations. Between them the static location mode was used in datum transmitting, location molding of structure and the sunshine deformation in GPS survey; and also the dynamic location mode was used in surveying dynamic deformation in GPS survey. The basic technical targets that GPS location and observing in high-rise building construction based on the satellite's angle of elevation, the number of satellite in effective observing, the number of observing time phase, the number of repeating station, the length of time phase, the interval of data sampling.Before observing we should have the common test, carrying electric test, inspective test. When observing we should define the effective observing procedure. Data processing of GPS location in high-rise building construction mainly includes data processing, the coordinate transformation of location result and the decision of GPS elevation etc. Data processing mainly discussed data predisposing, datum line calculating and the smooth level of network. The main operating points of predisposing data were inspecting the smooth filtration to data, getting out of gross errors, unifying the format of data files, operating the standard of data files, and correcting the mode of observing data. We can use the coordinates of ephemeris that satellites emit as the beginning data of datum line calculated. This dissertation determines standard of each stage for the beginning observing data on GPS location in high-rise building construction. Data processing of GPS location in high-rise building construction includes the calculation of datum line and the surveying adjustment of net as two stages, so we can adopt random software or other software which are formal identified to work it. This dissertation explicated that the vectors of GPS base line adopt the method of double different observing numbers to solve, and has an analysis according the location features of high-rise building constru...