摘要:
A device (10) for detecting deformations in solids includes an insertable casing (11) with inner dividing wall (20) and lower (26) and upper enclosed sections (24) filled with fluid (36 and 34). A first strain-sensing system (38), and a second strain-sensing system (42) are disposed in the lower and an upper enclosed systems respectively. A valve (18) couples the second strain-sensing system to the lower enclosed section (26) and is normally closed. The valve is constructed to open in response to a signal sent from the first strain-sensing system. The second strain-sensing system is constructed and arranged to measure the excessive strain.
摘要:
An apparatus (10) is provided for detecting deformation in solids in deep holes having a resilient vessel (12) pre-stressed into a rock formation. The vessel (12) is filled with fluid (14) and is sealed except for an outlet tube (16) of small diameter which extends all the way to, or close to, the surface (18). There the outlet tube (16) terminates in an extensible bellows (20). The whole apparatus is completely filled with fluid (14). Any deformation of the vessel (12) will cause fluid to be forced through the outlet tube (16) and so cause the bellows (20) to extend or contract. This motion can be monitored by any position-sensitive transducer (22) such as a linear variable differential transformer or capacitance bridge. A second tube (24) of the same length and size as the outlet tube (16) is filled with the same fluid. This tube (24) terminates at the bottom in close proximity to the resilient vessel (12). It also has a bellows (26) and a displacement transducer (28) at its upper end at the surface (18).
摘要:
To easily change internal pressure of a container according to a change in external pressure. In a strain gauge device 100, a piston 54 attached to a tubular opening portion 53A provided at a housing part 53 slides in response to external pressure. Thereby varying the volumes of a regulator oil containing region 52 and a sensitive region 15 so as to achieve a balance with the external pressure, to change the internal pressure. Then, in the above-described strain gauge device, because the internal pressures of the regulator oil containing region 52 and the sensitive region 15 are changed according to a change in external pressure only by sliding of the piston 54, it is possible to easily perform regulation of the internal pressure. Further, because the above-described pressure balance mechanism 51 is achieved with a simple configuration, it is possible to easily perform regulation of the external pressure and the internal pressure even in a high-temperature/high-pressure environment.
摘要:
Seither dient dazu der Druckwert der Hydraulikflüssigkeit. Weichen jedoch Festigkeit und Wandstärke des Rohres oder der Hülse von den Sollwerten ab, entsteht dabei entweder eine mangelhafte Verbindung zwischen Hülse und Rohr oder eine zu Schäden führende Überdehnung der Rohrwand. Zur Einhaltung der vorgegebenen Dehnungswerte wird das Volumen der in einer Hydrauliksonde (4) eingeführten Hydraulikflüssigkeit zur Anzeige des Verformungsgrades von Hülse (3) und/oder Rohr (1) verwendet. Mit dieser Maßnahme wird der Aufweitvorgang beendet, wenn das entsprechende Volumen an Hydraulikflüssigkeit eingespeist ist und nicht etwa bei Erreichen eines vorgegebenen Druckwertes.
摘要:
The present invention provides methods and apparatus for measuring subterranean strain. The methods and apparatus use fluid expansion principles to compensate for temperature variations and increase the accuracy of the strain measurements. The methods and apparatus contemplate the use of multiple fluid chambers according to some embodiments in order to remove temperature dependence from stress or strain measurements.
摘要:
An apparatus (10) is provided for detecting deformation in solids in deep holes having a resilient vessel (12) pre-stressed into a rock formation. The vessel (12) is filled with fluid (14) and is sealed except for an outlet tube (16) of small diameter which extends all the way to, or close to, the surface (18). There the outlet tube (16) terminates in an extensible bellows (20). The whole apparatus is completely filled with fluid (14). Any deformation of the vessel (12) will cause fluid to be forced through the outlet tube (16) and so cause the bellows (20) to extend or contract. This motion can be monitored by any position-sensitive transducer (22) such as a linear variable differential transformer or capacitance bridge. A second tube (24) of the same length and size as the outlet tube (16) is filled with the same fluid. This tube (24) terminates at the bottom in close proximity to the resilient vessel (12). It also has a bellows (26) and a displacement transducer (28) at its upper end at the surface (18).
摘要:
Seither dient dazu der Druckwert der Hydraulikflüssigkeit. Weichen jedoch Festigkeit und Wandstärke des Rohres oder der Hülse von den Sollwerten ab, entsteht dabei entweder eine mangelhafte Verbindung zwischen Hülse und Rohr oder eine zu Schäden führende Überdehnung der Rohrwand. Zur Einhaltung der vorgegebenen Dehnungswerte wird das Volumen der in einer Hydrauliksonde (4) eingeführten Hydraulikflüssigkeit zur Anzeige des Verformungsgrades von Hülse (3) und/oder Rohr (1) verwendet. Mit dieser Maßnahme wird der Aufweitvorgang beendet, wenn das entsprechende Volumen an Hydraulikflüssigkeit eingespeist ist und nicht etwa bei Erreichen eines vorgegebenen Druckwertes.