A high-rise in Nanjing Office building? Survey construction scheme
The construction site of the project is narrow and small, and the plane geometry is complex. The outer side line of the main building is connected into an ellipse by a number of arcs with different centers and radii; The cylinder wall is also curved, which brings great difficulties to the project positioning and setting out. For this reason, we set up a special survey and setting group to organize the implementation. Through analysis and comparison, first establish a closed traverse control network in the whole field around the foundation pit according to the off-site positioning control points, and then select the control points on the traverse network to conduct the axis survey. Its advantages lie in flexible selection of control points, good intervisibility conditions, convenient and simple observation and calculation, and quick recovery of control points that are accidentally damaged during construction. The survey of the traverse network shall be carried out according to the technical requirements of the first-class traverse. However, with the rise of the floor, the traverse control line point and the floor can not be seen from each other, so it is necessary to set up control points inside the building. There are four internal control points in total. The setting out of the floor axis is carried out according to the control network composed of internal control points. Because the installation and positioning of steel reinforced columns require high accuracy. A multi-function, high-precision and high-speed total station is used. The vertical survey of internal control points adopts the laser theodolite zenith method, and its accuracy is fully in line with the requirements of the Code for Design and Construction of Reinforced Concrete Tall Buildings after analysis. The setting out of the arc beam and wall shall be carried out according to the internal control line and the coordinates of the points on the arc line, and the deviation shall be controlled within the specified range.