Dual-mode glue extruding type dynamic pressure testing strainmeter

Abstract

The invention relates to the technical field of dynamic pressure testing devices, in particular to a dual-mode glue extruding type dynamic pressure testing strainmeter which is applicable to dynamic pressure testing of rock soil and mines based on strain calculation. A body comprises a measuring line, an orifice end cover, an inclusion base tube, a hole bottom end cover and a glue containing tube, wherein the orifice end cover, the inclusion base tube, the hole bottom end cover and the glue containing tube are connected in sequence. The orifice end cover and the hole bottom end cover are each provided with a liquid inlet hole, a liquid guide hole and an annular liquid guide groove which are communicated in sequence, and the annular liquid guide grove is formed in the outer surface. Each liquid guide groove is covered with a liquid expansion bag in a surrounded mode. The outer surface of the orifice end cover is provided with a blocking ring. The liquid inlet hole of the orifice end cover and the liquid inlet hole of the hole bottom end cover are communicated through a liquid tube penetrating through the inclusion base tube. The liquid tube is sleeved with an expandable sleeve. The inclusion base tube is provided with a glue outlet hole communicated with a glue containing cavity. The right end of a glue containing tube is connected with a piston tube in a sliding and sleeving mode. The dual-mode glue extruding type dynamic pressure testing strainmeter is good in sealing effect; the strainmeter and a measured drill hole can be coaxial easily, so the reliability and effectiveness of strain measurement data are improved, and the installation success rate is increased.

Description

technical field [0001] The invention relates to the technical field of dynamic pressure testing devices, in particular to a dual-mode rubber extrusion type dynamic pressure testing strain gauge, which is suitable for dynamic pressure testing based on strain calculation in rock and soil and mines. Background technique [0002] In geotechnical tunnels and excavation projects, secondary disturbance stress changes are key indicators for support design and precursor monitoring of rockburst and rock burst. [0003] Traditional excavation dynamic pressure testing devices are divided into oil pressure type, vibrating wire type and strain type, and none of them can be installed closely with the borehole wall, which is inconvenient to install and has a low success rate. There are also hollow inclusion strain gauges used for dynamic pressure testing, but traditional inclusion strain gauges use piston extrusion and rubber ring friction to seal the hole, and the rubber ring will be scrat...

AI Technical Summary

Problems solved by technology

[0003] Traditional excavation dynamic pressure test devices are divided into hydraulic type, vibrating wire type and strain type, and none of them can be installed closely with the borehole wall, which is inconvenient to install and has a low success rate

There are also hollow inclusion strain gauges used for dynamic pressure testing, but traditional inclusion strain gauges use piston extrusion and rubber ring friction to seal the hole, and the rubber ring will be scratched by the hole wall and lose its sealing function. Difficult to drill coaxial

Images