Device for measuring changes in converging rock formations in a mining cavity

A device for measuring changes in rock formations in a mining cavity employing elongate tubes fixed by adhesive in bore holes in opposite walls so that they align axially. The tubes are measuring anchors and each contains a series of axially spaced sensors in the form of strain gages in external rec...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	SCHUERMANN, FRITZ, MULLER, HERBERT, BODDICKER, HORST, HEUSINGER, PETER-PAUL
Format:	Patent
Sprache:	eng
Schlagworte:	DETECTING MASSES OR OBJECTS EMBANKMENTS EXCAVATIONS FIXED CONSTRUCTIONS FOUNDATIONS GEOPHYSICS GRAVITATIONAL MEASUREMENTS HYDRAULIC ENGINEERING INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES MEASURING MEASURING ANGLES MEASURING AREAS MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS PHYSICS SOIL SHIFTING TESTING UNDERGROUND OR UNDERWATER STRUCTURES
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Beschreibung
Zusammenfassung:	A device for measuring changes in rock formations in a mining cavity employing elongate tubes fixed by adhesive in bore holes in opposite walls so that they align axially. The tubes are measuring anchors and each contains a series of axially spaced sensors in the form of strain gages in external recessed portions. Fixed in each tube is a thin tube and these terminate at their outer ends in a convergence transmitter unit, suitable connections being established between the gages and the transmitter unit. Perpendicular to this arrangement is a similar assembly of measuring anchors, thin tubes and a convergence transmitter unit so that convergence of the formation in a mining cavity and elongation values can be determined.