Monitoring method of vertical displacement and vertical deflection change of building construction elements, especially of the roof, and a system for realization of this method

A system for monitoring of vertical displacement of a plurality of Points on building construction elements as well as vertical deflection change in the Points, the system comprising:

• a plurality of Rangefinders (R) configured to measure distances at selected Monitored Points (MP) and Control Points (CP) of the building construction elements coupled to a Central Device (CD);
• and
• said Central Device comprising:
• a) Distance Measuring Block (DMB), which collects measurement results from all Monitored Points (MP) and Control Points (CP), including measurements of distances from stable construction elements or a stable floor,
• b) Vertical Displacement Block (VDB), which calculates values of vertical displacement of the Monitored Points (MP) and the Control Points (CP), the value of vertical displacement of each Monitored Point being calculated by subtracting a measured monitor distance of the each Monitored Point from an initial value determined during a monitoring initiation, and the value of vertical displacement of each Control Point being calculated by subtracting a measured control distance of the each Control Point from an initial value determined during the monitoring initiation,
• c) Validation Block (VB), which verifies values of vertical displacement of the Monitored Points (MP) and the Control Points (CP) received from the Vertical Displacement Block (VDB),
• d) Building Model Block (BMB), which calculates corrected values of vertical displacement of the Monitored Points (MP) and values of vertical deflection change of construction elements in the Monitored Points (MP), the corrected value of vertical displacement of the Monitored Points being calculated by subtracting the value of the vertical displacement of each Control Point multiplied by a coefficient, whose value represents a part of vertical displacement of the corresponding Control Point, which is transferred to the Monitored Points, from the determined value of vertical displacement of the Monitored Points, and the value of vertical deflection change for each monitored construction element in a corresponding one of the Monitored Points, which occurred from the monitoring initiation, being calculated by subtracting the corrected 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 corrected value of vertical displacement of the one Monitored Point,
• e) Building Condition Diagnosis Block (BCDB), which includes a Limitation Block (LB) using allowable values and threshold values of deflection change and vertical displacement, determined during setting of parameters of the system, coupled to a Knowledge Base Block (KBB), which defines a threat of building structure safety using data received from the Building Model Block (BMB) and the Limitation Block (LB), and the Building Condition Diagnosis Block (BCDB) is coupled to a Signaling Block (SB).