After the construction enters the site, the construction unit will hand over two or three coordinate datum points to the construction enterprise. These coordinate points are generally given by the planning and design institute, and now many coordinate points are generally given by GPS. Small and medium-sized new projects can also require the planning and design institute to release the four-corner coordinates of the houses of the engineering buildings. This datum point is the most primitive basis for construction enterprises to establish control network and check coordinate points, so these datum points must be protected.

If you are a beginner, you should first know how to use the total station. This kind of intern who just entered the construction site was taught by the master. After foundation pit excavation, positioning piles must be set up first, generally using four points. After the positioning piles are set, according to the construction scheme, RTK is used to specify the corner points of the foundation pile caps, which is convenient for workers to construct on site. Accurate positioning of foundation bearing platform ~ floor reinforcement ~ floor column wall positioning and setting-out. When it reaches more than plus or minus zero, two points must be specified in the podium, and then the points will be led to each floor with instruments and equipment.

Development and design of earthwork backfilling, deep foundation pit of high-rise building is very deep. General earthwork company will level the site after transporting the upper earthwork. In general contracting, technical professional surveyors will use RTK handles, important coordinates and high-rise buildings. It's near the door. It's time to dig a foundation pit. The civil construction personnel of other subcontractors use the level to make important horizontal and vertical centerlines. Use centerline correlation. Release the boundary line of foundation pit excavation.

After the positioning piles of the building are set, the technical professional surveyors of the construction enterprise, the person in charge of the construction site and the project supervisor will jointly carry out construction setting-out and accurate measurement verification on the building project (the purpose of the supervisor is to supervise and certify by the site supervisor), and finally release all positioning piles of the center line of the building (according to the building size, the center line spacing can also be used for construction setting-out), and release all positioning piles of the center line according to the positioning piles (at least four) of the planning department and the construction plan of the lowest floor of the building. The special tool for wiring is "level gauge".