Patent ID: 8788240

Claim:
A method for monitoring vertical displacements of a plurality of Points on building construction elements and vertical deflection changes in the Points, said method comprising: measuring, by each of a plurality of Rangefinders, a monitor distance for each of selected Monitored Points, on the building construction elements, from stable construction elements or a stable floor; calculating, by a Central Device, a value of vertical displacement of each Monitored Point, by subtracting the measured monitor distance from an initial value determined during a monitoring initiation; and calculating, for each monitored construction element, a value of vertical deflection change in a corresponding one of the Monitored Points, that occurred from the monitoring initiation, by subtracting the calculated value of vertical displacement of each other Monitored Point multiplied by a coefficient, whose value represents a part of vertical displacement of the one Monitored Point from the calculated value of vertical displacement of the one Monitored Point.