Built-in joint meter and method for detecting openness of slit

Abstract

The invention relates to an embedded joint meter for detecting the width variation of cracks or structrual joint (deep) in concrete or rock and soil structure object, and detection method thereof. The joint meter comprises a sensor sheath and a displacement sensor disposed in the sensor sheath; hole positioning devices are connected on both ends of the sensor sheath through extension bars. The beneficial effect of the invention is that: 1, it can detect the width variation of cracks or structrual joint (deep) in concrete or rock and soil structure object effectively and accurately for a long term, grasp the width variation case of cracks or joints at any moment, provide information to the safe operation and management of engineering building, and provide technical support to engineering building safety estimation; 2, it can be embedded into crack directly when used, achieves the advantages of simple structure, reasonable arrangement, convenient and firm positioning, high detection precision, reliable operation performance, convenient using and high practicability, and for installed in a hole, instrument can be protected easily, need not maintenance and has a long service life; 3, the detection method is direct and convenient.

Description

technical field [0001] The invention relates to an embedded joint meter for detecting the opening and closing degree of cracks or structural joints inside (or deep) of concrete and geotechnical structures. Involved concrete structures, rock slopes, underground caverns, detection and monitoring of cracks in industrial and civil buildings. The present invention also relates to a method for detecting the opening and closing degree of cracks by using the joint meter of the present invention. Background technique [0002] The dam body in the water conservancy and electric power project is a combination of concrete and rock mass. Due to various factors, cracks or bad structural surfaces will appear on the dam body or rock slope after a period of time. To ensure the safety of the project, cracks or bad structural surfaces need to be corrected Long-term real-time monitoring is carried out on the structural surface, so as to grasp the opening and closing of cracks at any time. At p...

AI Technical Summary

Problems solved by technology

At present, the general monitoring method is to drill holes on the dam surface or rock mass through cracks or structural surfaces, then embed a long measuring rod, and install a measuring device at the hole through the measuring rod. This method is not only complicated to implement, but also And it can only measure the deformation of the whole hole, which is a comprehensive value, which includes the expansion or contraction deformation of the concrete itself and the deformation of the measuring rod, which is not intuitive, the observation effect is not good, and the hole instrument is difficult to protect

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