Zero-position memory pump injection-type inclusion strain gauge

Abstract

The invention provides a zero-position memory pump injection-type inclusion strain gauge with greatly raised installation and positioning precision. The inclusion strain gauge comprises an installation section and an installation rod used for pushing the installation section. The installation section comprises a measuring line, a hole opening end cover, an inclusion base pipe and a hole bottom end cover. The hole opening end cover, the inclusion base pipe and the hole bottom end cover are connected in order. The hole opening end cover and the hole bottom end cover are equipped with a plugging ring, a glue inlet hole, a glue guiding hole and an annular glue guiding groove arranged in an outer surface, and the glue inlet hole, the glue guiding hole and annular glue guiding groove are communicated in order. The glue guiding groove covers glue expanded bag. The glue inlet hole of the hole opening end cover is communicated with the glue inlet hole of the hole bottom end cover. A pressure regulating hole and a glue outlet hole are arranged in the hole bottom end cover. A pressure regulating member used for control connection and disconnection of the glue outlet and the glue guiding hole is arranged in the pressure regulating hole. The glue outlet hole is located in the outer surface of the hole bottom end cover and is located at the left side of the glue expanded bag of the hole bottom end cover. The reliability and availability of strain measuring data are raised and the installation survival rate is raised.

Description

technical field [0001] The invention relates to the technical field of measuring devices for strain and ground pressure in geotechnical and mining engineering, and specifically relates to a zero-position memory pumping type inclusion strain gauge, which is suitable for the actual measurement of the original rock stress and the mining dynamic pressure based on the strain of the hole wall. Distribution measurement, rockburst and coal and gas outburst strain precursor monitoring, etc. Background technique [0002] Actual measurement or process monitoring of hole wall strain is an important indicator for in-situ rock stress testing, mining dynamic pressure testing, rockburst and coal and gas outburst precursor detection, and is extremely important for tunnel excavation and mining construction. [0003] At present, the strain rosettes of hollow inclusion strain gauges used for in-situ rock stress measurement include three types: 9 strain gauges, 13 strain gauges and 12 strain gau...

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Problems solved by technology

[0003] At present, the strain rosettes of hollow inclusion strain gauges used for in-situ rock stress measurement include three types: 9 strain gauges, 13 strain gauges and 12 strain gauges, which cannot achieve repeated zeroing of each channel and are limited by limited The number of strain gauge channels, a single strain gauge can only measure the strain of a single hole in one cycle

The installation mechanism is to seal the resin by inserting the rubber ring into the hole. If the hole wall seeps water or is too rough, a potting cavity will be formed. If the rubber ring wears too much, the hole will not be sealed tightly, and the resin will be lost, resulting in lower installation and positioning accuracy. Low, so that the reliability and validity of the strain measurement data is not high, and the installation survival rate is low

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