CN2237237Y - Multi-medium strain type stress sensor - Google Patents
Multi-medium strain type stress sensor Download PDFInfo
- Publication number
- CN2237237Y CN2237237Y CN 95233927 CN95233927U CN2237237Y CN 2237237 Y CN2237237 Y CN 2237237Y CN 95233927 CN95233927 CN 95233927 CN 95233927 U CN95233927 U CN 95233927U CN 2237237 Y CN2237237 Y CN 2237237Y
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- CN
- China
- Prior art keywords
- sensor
- stress sensor
- stress
- fluid
- rock drill
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- Expired - Fee Related
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Abstract
The utility model discloses a multi-medium strain type stress sensor which is used for measuring the total stress in a certain direction in a rock drill and the osmotic pressure of liquids or gases in the gap of the rock drill. The utility model is mainly composed of a rigid borehole stress sensor, a fluid stress sensor, a taper sleeve, etc. The utility model is characterized in that the rigid borehole stress sensor is connected with the fluid stress sensor by screw threads into integration; two sets of electric negative strain gauges are treated as sensor elements to distinguish between the total stress in a certain direction in the rock drill and the osmotic pressure of the liquids or the gases in the gap of the rock drill. The total stress in a certain direction in the rock drill and the osmotic pressure of the liquids or the gases in the gap of the rock drill are converted to electric signals respectively and measured at the same time by a secondary instrument; the sensor elements adopt waterproof sealant and the sealant is sealed in the sensor.
Description
The utility model relates to a kind of strain gauge, and belong to mine and Geotechnical Engineering and measure the total stress of a certain direction in the rock body drilled and the seepage pressure sensor of space liquid or gas thereof, be a kind of novel sensor.
Along with deepening continuously of ROCK MECHANICS RESEARCH work, it has been recognized that rock can not only not think single-phase (solid phase).The rock mechanics model of setting up from this point obviously is incomplete, because this is not in accordance with facts.Natural rock is a kind of three-phase (solid phase, liquid and gas) medium, there is not too big error though can be used as single-phase medium consideration sometimes, but cannot do so in many cases, the interaction that must consider rock and the fluid problem that influences each other, therefore study corresponding test method and means to obtain in the rock mass some the total stress of a certain direction and two parameters of seepage pressure of space fluid thereof simultaneously, be a problem demanding prompt solution, yet also do not have at present a kind ofly can record the total stress of a certain direction in the rock mass and the sensor special of space these two parameters of fluid permeability pressure thereof simultaneously.
The purpose of this utility model is to design a kind of multimedia strain type stress sensor, it is simple in structure, can be effectively the seepage pressure of rock mass space liquid or gas be made a distinction from the total stress of a certain direction of rock mass, and can record in the rock mass some the total stress of a certain direction and variation of space liquid or gas seepage pressure thereof simultaneously exactly.
The utility model mainly is made up of rigidity drilling hole stress sensor 13 and fluid stress sensor 12 and taper sheath 4 etc., it is characterized in that: fluid stress sensor 12 is connected as a single entity itself and rigidity drilling hole stress sensor 13 by screw thread 14, the diameter of fluid stress sensor respectively is pasted with one group resistance strain gage as sensing element by strain gage adhesive less than the diameter of rigidity drilling hole stress sensor on fluid stress sensor 12 and rigidity boring sensor 13.The present invention can make a distinction the total stress of a certain direction in the rock body drilled and the seepage pressure of its space liquid or gas, be converted to electric signal respectively, cooperate with corresponding secondary instrument to record in the rock mass some the total stress of a certain direction and variation of space liquid or gas seepage pressure thereof simultaneously.
The utility model has the advantages that: simple in structure, can be effectively the seepage pressure of rock mass internal pore liquid or gas be made a distinction from the total stress of a certain direction of rock mass, and the while records the total stress of any a certain direction in the rock mass and the variation of space liquid or gas seepage pressure thereof exactly, be particularly suitable for installing and using in the rock body drilled, owing to waterproof gasket cement resistance strain gage is sealed in the sensor, makes this sensor under humidity or water environment, to work stably in a long term.
Description of drawings: accompanying drawing is the utility model structural representation, fluid stress sensor 12 among the figure, comprise fluid stress sensor elastomer 1, diaphragm resistance strain gage 2, protection glue 3, filtrator 11, rigidity drilling hole stress sensor 13, comprise rigidity drilling hole stress sensor elastic body 7, single shaft resistance strain gage 5, protection glue 6, O-ring seal 8, nut 9, cable 10, taper sheath 4, connecting thread 14.
During work, at first will by screw thread 14 the fluid stress sensor is connected rigidity drilling hole stress sensor front end and the multimedia strain type stress sensor that becomes one in accordance with regulations direction place in the boring, make sensor front end and foot of hole that certain clearance be arranged, whole cone shape rigidity drilling hole stress sensor elastic body 7 inserts in the taper sheath 4 that cuts in half along center line, the big I of taper sheath is carried out supporting selection according to the size of boring aperture, force taper sheath 4 each several parts closely to contact after the insertion with the wall of a borehole, and apply certain initial erection stress, with consolidating material such as cement or epoxy resin etc. the rear end of sensor is sealed then.When the boring surrouding rock stress changes, rigidity drilling hole stress sensor elastic body 7 can be experienced the variation of this stress, and convert electric signal to by the one group of resistance strain gage 5 that sticks on this elastic body 7, can record the changing value of total stress on this prescribed direction by corresponding secondary instrument.Because fluid stress sensor 12 is positioned at the front end of multimedia strain type stress sensor and diameter less than the diameter of rigidity drilling hole stress sensor, with foot of hole certain clearance is arranged again, therefore, it will not bear from hole diameter to pressure.When oozing out under the effect of rock mass internal pore fluid at pressure and very during fast balance, fluid stress sensor elastomer 1 can be experienced the variation of fluid permeability pressure, and convert electric signal to by diaphragm resistance strain gage 2, can record the variation of rock mass space fluid permeability pressure by corresponding secondary instrument.Because secondary instrument is provided with channel selector switch, therefore, can use same secondary instrument to measure the total stress of a certain direction of boring and the seepage pressure of country rock space fluid thereof by channel selector switch easily.If rock is easily broken or when being used for the geotechnique; for fear of contacting of fragmented rock particle or mud and fluid stress sensor elastomer; and cause measuring error, can a filtrator 11 be installed at the front end of fluid stress sensor 12, as wire netting or permeable stone etc.
Claims (4)
1, measures the seepage pressure multimedia strain type stress sensor of the interior a certain direction total stress of rock body drilled and space liquid or gas in mine and the Geotechnical Engineering, mainly by the rigidity drilling hole stress sensor, the fluid stress sensor, compositions such as taper sheath, it is characterized in that the fluid stress sensor is connected as a single entity by screw thread and rigidity drilling hole stress sensor, and fluid stress sensor and rigidity drilling hole stress sensor are pasted with one group of resistance strain gage respectively as sensing element by strain gage adhesive.
2, sensor according to claim 1 is characterized in that the diameter of the diameter of fluid stress sensor less than the rigidity drilling hole stress sensor.
3, sensor according to claim 1 and 2 is characterized in that two groups of resistance strain gages are sealed in respectively in its sensor by protection glue.
4, sensor according to claim 3 is characterized in that at the front end of fluid stress sensor filtrator being installed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95233927 CN2237237Y (en) | 1995-05-30 | 1995-05-30 | Multi-medium strain type stress sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95233927 CN2237237Y (en) | 1995-05-30 | 1995-05-30 | Multi-medium strain type stress sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2237237Y true CN2237237Y (en) | 1996-10-09 |
Family
ID=33877971
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95233927 Expired - Fee Related CN2237237Y (en) | 1995-05-30 | 1995-05-30 | Multi-medium strain type stress sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2237237Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674347A (en) * | 2013-12-10 | 2014-03-26 | 太原理工大学 | Hollow flexible inductor borehole stress sensor and detection method thereof |
| CN108195496A (en) * | 2017-11-29 | 2018-06-22 | 中国神华能源股份有限公司 | Measuring apparatus and measuring method |
| CN111119860A (en) * | 2019-12-23 | 2020-05-08 | 山东科技大学 | Pressure bar for sensing pressure distribution state in hole |
-
1995
- 1995-05-30 CN CN 95233927 patent/CN2237237Y/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103674347A (en) * | 2013-12-10 | 2014-03-26 | 太原理工大学 | Hollow flexible inductor borehole stress sensor and detection method thereof |
| CN103674347B (en) * | 2013-12-10 | 2016-01-20 | 太原理工大学 | A kind of hollow soft elasticity inductor drilling hole stress sensor and detection method |
| CN108195496A (en) * | 2017-11-29 | 2018-06-22 | 中国神华能源股份有限公司 | Measuring apparatus and measuring method |
| CN108195496B (en) * | 2017-11-29 | 2020-02-18 | 中国神华能源股份有限公司 | Measuring device and measuring method for measuring effective force |
| CN111119860A (en) * | 2019-12-23 | 2020-05-08 | 山东科技大学 | Pressure bar for sensing pressure distribution state in hole |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |