Patent RU-2367742-C1 (RU)
Title: Method of assembled or semi-assembled multilayer water-proof structure construction on ground and method of monitoring structure contact to ground
Inventor: TREGUB ANATOLIJ MIKHAJLOVICH
IPC: G01N3/32
Filed: 2008-02-12
Granted: 2009-09-20
Abstract: FIELD: construction. 
     SUBSTANCE: group of inventions concerns construction, particularly methods of construction for embedded or semi-embedded concrete waterproof structures, such as underground passages and vehicle tunnels, and methods of structure diagnostics and monitoring both in the process of construction and operation. Comprehensive analysis of structure contact to ground is provided, preventing impact of possible structure defects on final result due to differentiated approach to definition of defect and defect border localisation by the volume of 'structure-ground' system. Effect is achieved by the method of assembled or semi-assembled multilayer concrete waterproof structure construction in ground, involving water insulation works, installation of removable shifting or stationary boarding in design position, concrete supply over boarding, operations of seismoacoustic definition of structure contact to ground: mechanical vibration exciting in constructional structure after the concrete reaches stripping strength, measurement of vibration parametres in monitored surface point and detection of areas with measured parametre gradient. To provide verification of quality of structure contact to ground, ultrasonic monitoring of concrete structure defect presence and depth (e.g. for cavities and/or segregation) is performed additionally in detected defect areas or preliminarily. In the absence of defects contact quality defined by seismoacoustic method is considered reliable, in the presence of defects, they are eliminated by consolidating or fixating mix feed to defect area and repeated exciting of mechanical vibrations in the constructional structure and vibration parametre measurement are performed in the same or other monitored surface point, preferably in the area of detected defect. Ground contact monitoring method for multilayer waterproof concrete structures under construction or in operation involves conventional division of structure surface into sectors within which concrete thickness and insulation thickness parametres are equal, with further implementation of seismoacoustic quality monitoring of structure contact to ground: mechanical vibration exciting in the structure, vibration parametre measurement in monitored surface point, and detection of areas with measured parametre gradient within the selected sector. To provide verification of quality of structure contact to ground, monitoring of concrete structure defect presence and depth (e.g. for cavities and/or segregation) is performed additionally in detected defect areas or preliminarily, e.g. by ultrasonic method. In the absence of defects contact quality defined by seismoacoustic method is considered reliable, in the presence of defects, repeated assessment of quality of structure contact to ground by seismoacoustic method is performed, followed by verification of ground contact quality definition by ultrasonic method involving monitoring of defect presence and depth in the concrete structure itself in another monitored surface point, preferably within the area of detected defect. Vibration excitation and measurements are performed by non-destructive method at one side of constructional structure. 
     EFFECT: maintenance of constructional structure operation according to its design model, by providing reliable and lasting operation of constructional structures placed in ground, due to enhanced verification of quality of structure contact to ground. 
     2 cl, 2 dwg