What device helps control the vertical of buildings
The anti-aircraft sediment is installed sequentially under the stamps so that it is possible to control the verticality of the shaft of the tower, the elevator compartment and the position of the outer walls. The number of visitor brands and their location are determined depending on the form of the formwork and the height of the copra.
When erecting cops with a height of not more than 50 m, the number of marks can be reduced to two in the mine and one brand in the elevator department. In this case, the determination of the position of the external walls is carried out after the end of their construction by profile survey of external faces of the copra, performed by known methods using theodolite and measuring rail.