CN105403336A - Miniaturized full-bridge sounding test probe - Google Patents
Miniaturized full-bridge sounding test probe Download PDFInfo
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- CN105403336A CN105403336A CN201510941432.7A CN201510941432A CN105403336A CN 105403336 A CN105403336 A CN 105403336A CN 201510941432 A CN201510941432 A CN 201510941432A CN 105403336 A CN105403336 A CN 105403336A
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- metal foil
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
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- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
Abstract
Disclosed is a miniaturized full-bridge sounding test probe. The probe is divided into two segments, i.e., a miniaturized probe rod (9) and a miniaturized extension rod (4), and the miniaturized extension rod (4) is arranged on the miniaturized probe rod (9); the top portion of the miniaturized extension rod (4) is provided with a coaxial cable (1), and the lower portion of the coaxial cable (1) is provided with an analog-to-digital converter (2), a first metallic foil resistance strain gauge (3) and a second metallic foil resistance strain gauge (5) from top to bottom, wherein the coaxial cable (1) is connected with the analog-to-digital converter (2); a helix part (6) is disposed at the bottom end of the miniaturized extension rod (4) and at the top end of the miniaturized probe rod (9); and the miniaturized probe rod (9) is provided with a third metallic foil resistance strain gauge (7) and a fourth metallic foil resistance strain gauge (10), the outermost portion of the miniaturized probe rod (9) is provided with a sidewall friction cylinder (8), and the bottom portion of the miniaturized probe rod (9) is provided with a conical probe (11). The miniaturized full-bridge probe provided by the invention has the advantages of, small dimension, accuracy, convenience, rapidness and the like, thereby providing a powerful test tool for geotechnical engineering investigation.
Description
Technical field
The present invention relates to a kind of miniature full-bridge feeler inspection probe, belong to the testing tool of a kind of new soil layer static point resistance and side friction power in field of civil engineering.
Background technology
In recent years, along with the fast development of national economic development, static sounding (CPT) technology is played a greater and greater role.The object of static sounding is to find out engineering geological condition, analyzes the geological problem existed, makes effective Engineering Geology Evaluation.The revolutionary development of static sounding technology comes from the appearance of resistance-strain micron test in last century sensing technology.By designing one group of mechanics electricity sensing device, utilize pressure apparatus the feeler lever injection stratum of contact probe will be housed, the change in resistance of direct feeling soil layer, physical resistance change is converted into electrical signal change, and receive, store this electrical signal, the corresponding relation of recycling Resistance Value and electrical signal is read as the change of electrical signal the change of Resistance Value, its result can be used for some basic physical mechanics properties determining soil, as deformation modulus, the allowable bearing of soil, the undrained shear strength etc. of soil of soil.First China succeed in developing electric measuring type static sounding in nineteen sixty-five and be applied to prospecting.In recent years, along with the fast development of sensor technology, occurred many new static sounding technology, these technology can obtain the pore water pressure of soil layer, seismic event, pollutant proterties, temperature, even image etc. quickly and accurately.Based on above-mentioned advantage, static sounding technology is widely used in the prospecting of sub-surface.But for the thinner soil layer occurred under earth's surface, as phenomenons such as thin layers of sand, due to the impact of size effect, the Resistance Value adopting traditional static sounding feeler lever to draw is not accurate enough, does not meet with actual value.Along with the complicacy of engineering geology and the high request of engineering investigation and high standard, minor diameter static sounding feeler lever technology is arisen at the historic moment.At present, static sounding technology mainly adopts the feeler lever of the traditional standard size of half-bridge circuit technology.The contact probe diameter of the standard feeler lever of conventional static feeler inspection is 35.7mm, and sectional area is 10cm
2.The present invention proposes a kind of miniature full-bridge feeler inspection probe, and contact probe diameter is 20mm, and sectional area is 3.14cm
2, traditional half-bridge circuit is designed to full-bridge circuit by this probe, and standard-sized feeler lever is designed to miniature feeler lever, so that the soil layer particularly static point resistance of thin soil layer and side friction power under measuring earth's surface, meets the needs of actual prospecting engineering.The present invention proposes a kind of can the soil layer particularly static point resistance of thin soil layer and the in-situ test instrument of side friction power more accurately, easily and fast, for Geotechnical Engineering practice provides strong testing tool.
Summary of the invention
Technical matters: the technical problem to be solved in the present invention is the defect for domestic existing static sounding probe, proposes a kind of miniature full-bridge feeler inspection probe.
Technical scheme: the miniature full-bridge feeler inspection probe of one of the present invention, this probe is divided into miniature feeler lever and miniature extension rod two sections, miniature feeler lever is provided with one section of miniature extension rod, on miniature extension rod, is provided with the first type metal foil type resistance strain gage and the second type metal foil type resistance strain gage composition full-bridge circuit simultaneously; Be provided with concentric cable at miniature extension rod top, the bottom of concentric cable is provided with analog to digital converter, the first type metal foil type resistance strain gage, the second type metal foil type resistance strain gage from top to bottom successively; Its standard coaxial cable is connected with analog to digital converter, for transmission of signal and data; First type metal foil type resistance strain gage is symmetricly set in the external wall of upper portion of miniature extension rod, and the second type metal foil type resistance strain gage is symmetricly set on the bottom outer wall of miniature extension rod; Spiral is positioned at the bottom of miniature extension rod and the top of miniature feeler lever, for connecting miniature extension rod and miniature feeler lever; Outer setting the 3rd type metal foil type resistance strain gage of miniature feeler lever and the 4th type metal foil type resistance strain gage, most external is provided with sidewall friction cylinder, and the foot of miniature feeler lever is circular cone probe; Adopt the first type metal foil type resistance strain gage and the 3rd type metal foil type resistance strain gage to form full-bridge circuit for test beds side friction power, adopt the second type metal foil type resistance strain gage and the 4th type metal foil type resistance strain gage to form full-bridge circuit for test beds static point resistance.
Miniature extension rod Design of length is 70mm.
The Design of length of miniature feeler lever is 92.3mm.
The cone angle of circular cone probe is 60 °, and diameter is 20mm, and floorage is 3.14cm
2.
The height of sidewall friction cylinder is 75mm, and its surface area is 47.1cm
2.
The height of spiral is 15mm.
The length of the first type metal foil type resistance strain gage, the second type metal foil type resistance strain gage, the 3rd type metal foil type resistance strain gage, the 4th type metal foil type resistance strain gage is 1mm, and resistance is 120 Ω.
The miniature full-bridge feeler inspection probe of one of the present invention, measure portion forms primarily of the full-bridge circuit system of type metal foil type resistance strain gage, sidewall friction cylinder, analog to digital converter, spiral etc. and inside thereof.The type metal foil type resistance strain gage of one group of symmetry of miniature extension rod and another type metal foil type resistance strain gage organizing symmetry of miniature feeler lever form full-bridge circuit, can measure static point resistance and the side friction power of soil layer.Utilize static press device by miniature for full-bridge of the present invention feeler lever press-in soil layer in Practical Project, the speed of press-in is 1mm/s, after press-in soil layer, probe interior metal foil resistance foil gauge can the change in resistance of direct feeling soil layer, each parameter is converted to after digital signal through analog to digital converter and preserves in co-axial cables transport to the Microcomputer Collecting and storage system on earth's surface, then according to static point resistance and the side friction power of theoretical and experimental formula factorization calculating soil layer, the soil layer particularly static point resistance of the real-time continuous of thin soil layer and side friction power sectional view is drawn.
Beneficial effect: when thinner layer of sand or other thin soil layer appear in soil layer under earth's surface, need the test equipment that the soil layer thin with thickness is corresponding, therefore, first needs to this engineering geological condition the problem solving feeler lever size.Meanwhile, often there is the problems such as test result accuracy for thin soil layer is not high in the static sounding technology of traditional half-bridge circuit.
When there is thin soil layer in the static sounding bar that the invention solves the half-bridge circuit of domestic existing conventional size under evaluating earth surface, the defect of static point resistance and side friction power can not be measured accurately and rapidly, by design, there is the miniature probe of full-bridge circuit, carry out accurately, the soil layer particularly static point resistance of thin soil layer and side friction power under evaluating earth surface easily and quickly.This miniature probe size is little, has accurately, easily and fast and repeatable high, the feature such as quality control is good.
Accompanying drawing explanation
Fig. 1 is the miniature full-bridge feeler inspection probe of one of the present invention;
Wherein have: concentric cable 1, analog to digital converter 2, first type metal foil type resistance strain gage 3, miniature extension rod 4, second type metal foil type resistance strain gage 5, spiral 6, the 3rd type metal foil type resistance strain gage 7, sidewall friction cylinder 8, miniature feeler lever 9, the 4th type metal foil type resistance strain gage 10, circular cone probe 11.
Embodiment
The miniature full-bridge feeler inspection probe of one of the present invention, miniature feeler lever 9 adds one section of miniature extension rod 4, adds two groups of type metal foil type resistance strain gage composition full-bridge circuits simultaneously.Be provided with concentric cable 1 at miniature extension rod 4 top, the bottom of concentric cable 1 is provided with analog to digital converter 2, first type metal foil type resistance strain gage 3, second type metal foil type resistance strain gage 5 from top to bottom successively.Its standard coaxial cable 1 is connected with analog to digital converter 2, for transmission of signal and data.First type metal foil type resistance strain gage 3 is symmetricly set on the outer wall of miniature extension rod 4, and the second type metal foil type resistance strain gage 5 is also symmetricly set on the outer wall of miniature extension rod 4.Spiral 6 is positioned at the bottom of miniature extension rod 4 and the top of miniature feeler lever 9, for connecting miniature extension rod 4 and miniature feeler lever 9.The inside of miniature feeler lever 9 is provided with sidewall friction cylinder 8, the 3rd type metal foil type resistance strain gage 7 and the 4th type metal foil type resistance strain gage 10 from outside to inside, and the foot of miniature feeler lever 9 is circular cone probe 11.Adopt the first type metal foil type resistance strain gage 3 and the 3rd type metal foil type resistance strain gage 7 to form full-bridge circuit for test beds sidewall resistance, second adopts type metal foil type resistance strain gage 5 and type metal foil type resistance strain gage 10 to form full-bridge circuit for test beds static point resistance.
The Design of length of miniature extension rod 4 is 70mm.
The Design of length of miniature feeler lever 9 is 92.3mm.
The cone angle of circular cone probe 11 is 60 °, and diameter is 20mm, and floorage is 3.14cm
2.
The height of sidewall friction cylinder 8 is 75mm, and its surface area is 47.1cm
2.
The height of spiral 6 is 15mm.
The length of the first type metal foil type resistance strain gage 3, second type metal foil type resistance strain gage 5, the 3rd type metal foil type resistance strain gage 7, the 4th type metal foil type resistance strain gage 10 is 1mm, and resistance is 120 Ω.
The miniature full-bridge feeler inspection probe of one of the present invention, measure portion forms primarily of the full-bridge circuit system of type metal foil type resistance strain gage, sidewall friction cylinder, analog to digital converter, spiral etc. and inside thereof.Before by probe press-in soil layer, need to carry out stress demarcation and temperature calibration.After completing calibrating procedure, by full-bridge miniature probe of the present invention with in the speed of 1mm/s press-in soil layer, because the change of external force and temperature makes the resistance of resistance strain gage change, the change of resistance and then show as the change of voltage.The resistance variations of the resistance strain gage in miniature feeler lever is by the impact of external force and temperature, and the resistance variations of resistance strain gage in miniature extension rod is only by the impact of temperature.In full-bridge circuit, based on the voltage output value V that external force and temperature cause
outfor:
In formula, R
1, R
2, R
3, R
4the resistance of the 4th type metal foil type resistance strain gage 10 on the left of being respectively, the second type metal foil type resistance strain gage 5 in left side, the 4th type metal foil type resistance strain gage 10 on right side, the second type metal foil type resistance strain gage 5 on right side; Δ R
1Swith Δ R
3Sbe respectively the resistance change by the 4th type metal foil type resistance strain gage 10 of resistance rear left side and the 4th type metal foil type resistance strain gage 10 on right side; Δ R
1T, Δ R
2T, Δ R
3Twith Δ R
4Tbe respectively the resistance change that causes due to temperature change of resistance of the 4th type metal foil type resistance strain gage 10 in left side, the second type metal foil type resistance strain gage 5 in left side, the 4th type metal foil type resistance strain gage 10 on right side, the second type metal foil type resistance strain gage 5 on right side; V
infor the magnitude of voltage of input.
The each parameter obtained is converted to after digital signal through analog to digital converter, preserve in co-axial cables transport to the Microcomputer Collecting and storage system on earth's surface, then according to static point resistance and the side friction power of theoretical and experimental formula factorization calculating soil layer, the soil layer particularly static point resistance of the real-time continuous of thin soil layer and side friction power sectional view can be drawn.
Claims (7)
1. a miniature full-bridge feeler inspection probe, it is characterized in that this probe is divided into miniature feeler lever (9) and miniature extension rod (4) two sections, miniature feeler lever (9) is provided with one section of miniature extension rod (4), on miniature extension rod (4), is provided with the first type metal foil type resistance strain gage (3) and the second type metal foil type resistance strain gage (5) composition full-bridge circuit simultaneously; Be provided with concentric cable (1) at miniature extension rod (4) top, the bottom of concentric cable (1) is provided with analog to digital converter (2), the first type metal foil type resistance strain gage (3), the second type metal foil type resistance strain gage (5) from top to bottom successively; Its standard coaxial cable (1) is connected with analog to digital converter (2), for transmission of signal and data; First type metal foil type resistance strain gage (3) is symmetricly set in the external wall of upper portion of miniature extension rod (4), and the second type metal foil type resistance strain gage (5) is symmetricly set on the bottom outer wall of miniature extension rod (4); Spiral (6) is positioned at the bottom of miniature extension rod (4) and the top of miniature feeler lever (9), for connecting miniature extension rod (4) and miniature feeler lever (9); The outside of miniature feeler lever (9) is provided with the 3rd type metal foil type resistance strain gage (7) and the 4th type metal foil type resistance strain gage (10), and most external is provided with sidewall friction cylinder (8), and the foot of miniature feeler lever (9) is circular cone probe (11); Adopt the first type metal foil type resistance strain gage (3) and the 3rd type metal foil type resistance strain gage (7) to form full-bridge circuit and be used for test beds side friction power, adopt the second type metal foil type resistance strain gage (5) and the 4th type metal foil type resistance strain gage (10) to form full-bridge circuit and be used for test beds static point resistance.
2. the miniature full-bridge feeler inspection probe of one according to claim 1, is characterized in that miniature extension rod (4) Design of length is 70mm.
3. the miniature full-bridge feeler inspection probe of one according to claim 1, is characterized in that the Design of length of miniature feeler lever (9) is 92.3mm.
4. the miniature full-bridge feeler inspection probe of one according to claim 1, is characterized in that the cone angle of circular cone probe (11) is 60
°, diameter is 20mm, and floorage is 3.14cm
2.
5. the miniature full-bridge feeler inspection probe of one according to claim 1, it is characterized in that the height of sidewall friction cylinder (8) is 75mm, its surface area is 47.1cm
2.
6. the miniature full-bridge feeler inspection probe of one according to claim 1, is characterized in that the height of spiral is 15mm.
7. the miniature full-bridge feeler inspection probe of one according to claim 1, the length that it is characterized in that the first type metal foil type resistance strain gage (3), the second type metal foil type resistance strain gage (5), the 3rd type metal foil type resistance strain gage (7), the 4th type metal foil type resistance strain gage (10) is 1mm, and resistance is 120 Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510941432.7A CN105403336B (en) | 2015-12-16 | 2015-12-16 | A kind of miniature full-bridge feeler inspection probe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510941432.7A CN105403336B (en) | 2015-12-16 | 2015-12-16 | A kind of miniature full-bridge feeler inspection probe |
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| Publication Number | Publication Date |
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| CN105403336A true CN105403336A (en) | 2016-03-16 |
| CN105403336B CN105403336B (en) | 2018-06-12 |
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| CN201510941432.7A Active CN105403336B (en) | 2015-12-16 | 2015-12-16 | A kind of miniature full-bridge feeler inspection probe |
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Citations (6)
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|---|---|---|---|---|
| US20050076709A1 (en) * | 2001-12-28 | 2005-04-14 | Himachal Safety Systems Pty Ltd | Soil or snow probe |
| CN201151921Y (en) * | 2008-01-22 | 2008-11-19 | 陶克靖 | Weighting instrument for bearing capacity explored in static state |
| CN201738295U (en) * | 2010-08-03 | 2011-02-09 | 武汉磐索地勘科技有限公司 | Probe for cone penetration test |
| CN102174808A (en) * | 2011-02-24 | 2011-09-07 | 中国地质大学（武汉） | Piezocone penetration test (CPTU) prober of dual-deformed column |
| CN102926370A (en) * | 2012-11-14 | 2013-02-13 | 安徽华电工程咨询设计有限公司 | Probe for micro static penetrometer |
| CN103255757A (en) * | 2013-06-03 | 2013-08-21 | 东南大学 | Energy environment static sounding probe capable of measuring deep soil temperatures |
-
2015
- 2015-12-16 CN CN201510941432.7A patent/CN105403336B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050076709A1 (en) * | 2001-12-28 | 2005-04-14 | Himachal Safety Systems Pty Ltd | Soil or snow probe |
| CN201151921Y (en) * | 2008-01-22 | 2008-11-19 | 陶克靖 | Weighting instrument for bearing capacity explored in static state |
| CN201738295U (en) * | 2010-08-03 | 2011-02-09 | 武汉磐索地勘科技有限公司 | Probe for cone penetration test |
| CN102174808A (en) * | 2011-02-24 | 2011-09-07 | 中国地质大学（武汉） | Piezocone penetration test (CPTU) prober of dual-deformed column |
| CN102926370A (en) * | 2012-11-14 | 2013-02-13 | 安徽华电工程咨询设计有限公司 | Probe for micro static penetrometer |
| CN103255757A (en) * | 2013-06-03 | 2013-08-21 | 东南大学 | Energy environment static sounding probe capable of measuring deep soil temperatures |
Non-Patent Citations (1)
| Title |
|---|
| 郝春元: ""关于静力触探探头温度补偿的试验研究"", 《工程勘探》 * |
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