Football ground construction how to measure the line?
The construction of the football ground is based on the coordinates of the centerline of the design drawings. First of all, the data of the piles to be piled and the on-site piles were accepted and re-tested, and they were confirmed to be correct. They were saved as a permanent basis for the project. See Figure 2.1.2.
Measuring instruments use instruments that have been calibrated by total stations, theodolites, prisms, and steel rulers.
1. Total Station Measurement: Place the total station at position O and calculate OC=OD=OA=OB by Cartesian coordinates. Place the theodolite at point A, and sight the AB rotation angle for AD to obtain 90. , Then the theodolite support at point C, sighting CB, angle of sight of the CD is 90. . At 1/2 of the AD line, 1/2 of the BC line has E and F points respectively, and the two points are connected to the centerline of the football field. The connected AD and BC are two sides. Even the AB and CD are two football field ends and the EF is the centerline of the football field.
2. Right-angle intersection method: Use two theodolites, respectively, on the two points O1 and O2, and calculate the number of O2O1C angles and the number of O1O2C angles with the support angle coordinates. The two instruments meet the position of point C at the same time. The method can be used to meet the positions of points A, B, and D, respectively, and connect the two sides of the site of AD and BC. The two bottom lines connecting the sites AB and CD are also connected to the center line of the site. See Figure 2.1.2.
3. Coordinate method: The total station is set in the center of the football field (given by the design), calculated by Cartesian coordinates, the distance of OD, OC, OA, OB, and the angle of the origin and each point. The exact location of the point can be obtained directly by sighting the points (A, B, C, D) directly on site.
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