CN102322982A - Device and method for measuring inner stress of concrete - Google Patents
Device and method for measuring inner stress of concrete Download PDFInfo
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- CN102322982A CN102322982A CN201110171572A CN201110171572A CN102322982A CN 102322982 A CN102322982 A CN 102322982A CN 201110171572 A CN201110171572 A CN 201110171572A CN 201110171572 A CN201110171572 A CN 201110171572A CN 102322982 A CN102322982 A CN 102322982A
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- 239000004567 concrete Substances 0.000 title claims abstract description 51
- 238000000034 method Methods 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 48
- 239000010959 steel Substances 0.000 claims abstract description 48
- 230000008054 signal transmission Effects 0.000 claims abstract 2
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 claims 1
- 239000011888 foil Substances 0.000 abstract description 19
- 238000012544 monitoring process Methods 0.000 abstract description 9
- 230000007547 defect Effects 0.000 abstract 1
- 239000011159 matrix material Substances 0.000 description 16
- 238000005259 measurement Methods 0.000 description 12
- 238000005516 engineering process Methods 0.000 description 4
- 230000001419 dependent effect Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011178 precast concrete Substances 0.000 description 1
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a device and method for measuring the inner stress of concrete. The device comprises two hemispherical shells, wherein a left hemispherical shell, a right hemispherical shell and a force measuring steel ring are assembled together to form a spherical cavity, the force measuring steel ring is provided with rubber-based strain foils, the spherical cavity is provided with signal acquisition boards, the rubber-based strain foils are connected with the signal acquisition boards through lead wires, and the signal acquisition boards are connected with signal transmission lines. The device is buried in a concrete structure; a plurality of rubber-based strain foils are adhered to an inner surface of the force measuring steel ring at equal intervals; a surface stress cosine function curve of the force measuring steel ring is fit according to a stress value measured on the surface of the force measuring steel ring; and the direction and magnitude of a primary stress of the concrete are measured according to a phase angle and an amplitude of the function curve. The device and method for measuring the inner stress of the concrete provided by the invention can be used for overcoming the defects of difficulty in the bury and positioning as well as poor data reliability of the traditional strain gauge for monitoring the stress of an inner structure of the concrete, and is particularly suitable for measuring the stress state of the inner part of a large-volume concrete structure.
Description
Technical field
The present invention relates to a kind of measurement mechanism and measuring method thereof of inside concrete stress, belong to the concrete stress field of measurement.
Background technology
Concrete dam monitored the dam safety running status in order to build up the back at dam when building, and need bury concrete strain gauge underground in dam inside, through to the resolving of concrete strain Monitoring Data, obtains the stress state of inside concrete.Be various types of strainometers and the Strain Meter Set formed by strainometer at present using more aspect the concrete dam stress monitoring.Single the strainometer that is embedded in the concrete can measure the strain of concrete along the strainometer direction; If the stress state of monitoring xoncrete structure certain; Must a plurality of strainometers be arranged by specific direction and bury underground, adopt different solution formulas to obtain this place's stress state for different arrangement modes.Shown in accompanying drawing 1, be two groups, three groups and six spatial relationships of organizing each strainometer arrangement in the Strain Meter Set.
Because to resolve stress state amount influence very big for the direction correct of burying underground of strainometer; When therefore burying Strain Meter Set underground; Need strict controlling strain meter orientation, angular error generally must not surpass ± 1 °, in order to guarantee to bury underground the correct of strainometer direction; Strain Meter Set need be fixed on bearing and the pole usually and bury underground, should adopt embedded anchor bar or band bar precast concrete block hold-down support position, shop and direction respectively according to the position of Strain Meter Set in concrete.
Strain Meter Set requires height except burying technology, and the technical requirement aspect resolving is also very strict.The physical quantity that at first each strainometer directly measures in the Strain Meter Set is a dependent variable; And there is the free volume distortion in concrete material at unstress state itself; This part distortion is can not cause the inside concrete STRESS VARIATION; Therefore carrying out need the dependent variable that each strainometer measures being deducted the distortion of concrete free volume before concrete stress resolves; And this physical quantity need measure through no strainometer, that is to say that the measurement data that dependent variable that Strain Meter Set measures also need combine not have strainometer could correctly resolve concrete stress state value.Secondly the variation of the measured value of each strainometer all can produce appreciable impact to resolving the result in the Strain Meter Set, therefore works as certain strainometer measurement result and exists than mistake or inefficacy, probably causes the inefficacy of whole Strain Meter Set.
In sum; The Strain Meter Set that in concrete dam safety monitoring engineering, generally adopts at present; Because its design feature; It buries underground with the technical requirement of data solver very high, and this has reduced the reliability of this monitoring method on the one hand, has then significantly improved the technical costs of this monitoring means on the other hand.
Summary of the invention
Technical matters to be solved by this invention provides a kind of measurement mechanism and measuring method thereof of inside concrete stress; Overcome existing concrete inner structure stress monitoring Strain Meter Set and bury the shortcoming of location difficulty and data reliability difference underground, especially be fit to measure the inner stress state of large volume concrete structural.
For solving the problems of the technologies described above; The technical scheme that the present invention takes is: a kind of measurement mechanism of inside concrete stress, comprise the two halves spherical shell, and left hemisphere shell, right hemispherical Shell and dynamometry steel loop are assembled into spherical cavity; The dynamometry steel loop is provided with the matrix foil gauge; Spherical cavity is provided with signal acquiring board, and matrix foil gauge lead-in wire connects signal acquiring board, and signal acquiring board is connected with signal transmssion line.
Said dynamometry steel loop inboard equidistantly is provided with a plurality of matrix foil gauges.
Said dynamometry steel loop outside surface is a uneven surface.
A kind of measuring method of inside concrete stress; Dynamometry steel loop and left hemisphere shell, right hemispherical Shell be common forms a spherical dynamometry structure; Be embedded in the xoncrete structure; Dynamometry steel loop inside surface equidistantly posts a plurality of matrix foil gauges, and the strain value match dynamometry steel loop surface strain cosine function curve that records according to dynamometry steel loop surface records concrete principal direction of stress and principle stress size according to the phasing degree and the amplitude of function curve.
Said dynamometry steel loop inboard by clockwise or counterclockwise uniformly-spaced angle stick the matrix foil gauge.
Said dynamometry steel loop outside surface texturing or corrosion.
The measurement mechanism and the measuring method thereof of a kind of inside concrete stress of the present invention, dynamometry steel loop outside surface texturing or corrosion increase its roughness, help and concrete gluing.The whole device profile of the present invention is a complete spheroid; In order to the circular hole effect in the structure elastic body, to compare with Strain Meter Set, it is more convenient that it buries process underground; And the dynamometry steel loop in the device contacts more abundant with concrete, is more conducive to concrete stress state is made measurement accurately.
The beaer structure that the present invention measures stress is a dynamometry steel loop, and the matrix foil gauge is equidistantly posted in dynamometry steel loop inside, measures the dynamometry steel loop stress distribution in one week through the matrix foil gauge.The dynamometry steel loop just can produce strain variation when receiving inside concrete stress, promptly dynamometry steel loop structure is directly measured the stress state amount of inside concrete.With respect to the Strain Meter Set measuring method, need not consider the distortion of concrete own vol.
The present invention posts a plurality of matrix foil gauges at dynamometry steel loop inside surface; And the Strain Distribution in measurement dynamometry one week of steel loop; Owing to can arrange a plurality of measuring points, therefore after indivedual measuring points lost efficacy, only can reduce the fitting precision of match cosine curve formula; Can not cause the inefficacy of entire measuring device, therefore have higher reliability.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is described further:
Fig. 1 is the spatial relationship figure that each strainometer is arranged in the Strain Meter Set in the background technology;
Fig. 2 is apparatus of the present invention assembly drawing;
Fig. 3 is a dynamometry steel loop paster synoptic diagram of the present invention.
Embodiment
As shown in Figure 2; A kind of measurement mechanism of inside concrete stress comprises the two halves spherical shell, and left hemisphere shell 1, right hemispherical Shell 2 and dynamometry steel loop 3 are assembled into spherical cavity; Dynamometry steel loop 3 is provided with matrix foil gauge 4; Spherical cavity is provided with signal acquiring board 5, and matrix foil gauge 4 lead-in wires connect signal acquiring board 5, and signal acquiring board 5 is connected with signal transmssion line 6.
The strain data that signal transmssion line 6 is gathered signal acquiring board 5 is transferred to the remote monitoring system.Dynamometry steel loop 3 inboards by clockwise or counterclockwise uniformly-spaced angle stick a plurality of matrix foil gauges 4; Matrix foil gauge 4 carries out paster as requested; Matrix foil gauge 4 lead-in wire is connected to signal acquiring board 5, and integrated a plurality of metering circuits are advisable with the Hui Sitong bridge circuit on the signal acquiring board 5.And through signal transmssion line 6 transmission measurement data.Two plastics hemisphere and dynamometry steel loop 3 are assembled into a complete spheroid jointly, and the used adhesive glue of assembly unit can not cover the outside surface and the plastics spherical shell outside surface of dynamometry steel loop 3.Signal acquiring board 5 usefulness screws are fixed on the hemispherical Shell, can not the rigidity bonding be arranged with dynamometry steel loop 3.Signal transmssion line 6 passes from the center of one of them hemispherical Shell.
A kind of measuring method of inside concrete stress, a dynamometry steel loop 3 is formed a spherical dynamometry structure jointly with left hemisphere shell 1, right hemispherical Shell 2, is embedded in the xoncrete structure.As shown in Figure 3, dynamometry matrix foil gauge 4 and temperature compensation sheet 7 are posted in dynamometry steel loop 3 inside.The strain value match dynamometry steel loop 4 surface strain cosine function curves that record according to dynamometry steel loop 4 surfaces record concrete principal direction of stress and principle stress size according to the phasing degree and the amplitude of function curve.
Said dynamometry steel loop 3 inboards by clockwise or counterclockwise uniformly-spaced angle stick matrix foil gauge 4.
Angle φ is calculated as follows at interval, and wherein N is matrix foil gauge 4 numbers in the dynamometry steel loop 3:
φ=180°/?N
The aperture problem of stress concentration of circular hole is classical problem in the Elasticity, and the size that is exactly the aperture is much smaller than elastomeric size, and the elastomeric border of hole back gauge distant (approximately greater than 1.5 times of port sizes).The analytic solution of this problem exist; Analyzing the analytic solution of this problem can find; The tangential stress of circular hole interior surface is the cosine function of 2 times of deflections; Circular hole interior surface tangential stress extreme point direction is the principal direction of stress of elastic body boundary stress just; Therefore and there are linear dependence in the size of tangential stress and elastic boundary stress value, can simulate the cosine curve of circular hole interior surface tangential stress through measuring circular hole interior surface once the tangential stress distribution in week, according to phasing degree in the cosine curve formula and big or small this elastomeric stress state value that just can solve of amplitude.
Apparatus of the present invention are embedded in the concrete, through measuring the hoop strain of each measuring point on the dynamometry steel loop 3, and can calculate the concrete stress state value of this sensing device burial place according to theoretical formula and calibrating parameters.Especially be fit to measure the inner stress state of large volume concrete structural.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110171572.2A CN102322982B (en) | 2011-06-24 | 2011-06-24 | Device and method for measuring inner stress of concrete |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110171572.2A CN102322982B (en) | 2011-06-24 | 2011-06-24 | Device and method for measuring inner stress of concrete |
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| CN102322982A true CN102322982A (en) | 2012-01-18 |
| CN102322982B CN102322982B (en) | 2014-03-26 |
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| CN201110171572.2A Expired - Fee Related CN102322982B (en) | 2011-06-24 | 2011-06-24 | Device and method for measuring inner stress of concrete |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398807A (en) * | 2013-08-12 | 2013-11-20 | 中交第一公路工程局有限公司土木技术研究院 | Novel three dimensional stress measuring sensor |
| CN103954386A (en) * | 2014-04-15 | 2014-07-30 | 沈阳建筑大学 | Three-dimensional space stress-strain measurement method based on fiber bragg grating sensor |
| CN105403192A (en) * | 2015-12-17 | 2016-03-16 | 中国地震局地壳应力研究所 | Ball-type random-orientation deformation measurement instrument |
| CN105606263A (en) * | 2016-01-14 | 2016-05-25 | 北京至感传感器技术研究院有限公司 | Triaxial stress gauge |
| CN106382999A (en) * | 2016-09-06 | 2017-02-08 | 哈尔滨工业大学 | Maximum principal stress sensor of road fiber grating |
| CN106839967A (en) * | 2017-04-10 | 2017-06-13 | 中国有色金属工业昆明勘察设计研究院 | Spherical ess-strain monitoring device that is a kind of multi-direction and can combining |
| CN109682504A (en) * | 2019-01-04 | 2019-04-26 | 三峡大学 | The device and method of magnetic force utricule measurement crustal stress |
| CN110132463A (en) * | 2018-02-09 | 2019-08-16 | 武汉理工大学 | A wireless signal transmission spherical earth pressure sensor |
| CN112632676A (en) * | 2020-12-23 | 2021-04-09 | 华能澜沧江水电股份有限公司 | Concrete dam stress gradient monitoring method |
| CN113091962A (en) * | 2021-04-09 | 2021-07-09 | 交通运输部公路科学研究所 | A pavement pressure detection device |
| CN114323371A (en) * | 2021-12-22 | 2022-04-12 | 中铁七局集团有限公司 | Self-balancing concrete stress tester |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749032A (en) * | 2015-04-16 | 2015-07-01 | 湖南大学 | Testing device for internal stress of soil-rock mixture or concrete |
| CN105547253B (en) * | 2016-01-10 | 2018-06-29 | 王德新 | A kind of special drawing measuring apparatus of Road Design |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103398807A (en) * | 2013-08-12 | 2013-11-20 | 中交第一公路工程局有限公司土木技术研究院 | Novel three dimensional stress measuring sensor |
| CN103954386B (en) * | 2014-04-15 | 2016-09-28 | 沈阳建筑大学 | A kind of three dimensions stress-strain measuring method based on fiber-optic grating sensor |
| CN103954386A (en) * | 2014-04-15 | 2014-07-30 | 沈阳建筑大学 | Three-dimensional space stress-strain measurement method based on fiber bragg grating sensor |
| CN105403192B (en) * | 2015-12-17 | 2019-04-09 | 中国地震局地壳应力研究所 | A kind of ball-type is arbitrarily to earth deformation measurement instrument |
| CN105403192A (en) * | 2015-12-17 | 2016-03-16 | 中国地震局地壳应力研究所 | Ball-type random-orientation deformation measurement instrument |
| CN105606263A (en) * | 2016-01-14 | 2016-05-25 | 北京至感传感器技术研究院有限公司 | Triaxial stress gauge |
| CN106382999A (en) * | 2016-09-06 | 2017-02-08 | 哈尔滨工业大学 | Maximum principal stress sensor of road fiber grating |
| CN106382999B (en) * | 2016-09-06 | 2019-03-22 | 哈尔滨工业大学 | Road fiber grating maximum principal stress sensor |
| CN106839967A (en) * | 2017-04-10 | 2017-06-13 | 中国有色金属工业昆明勘察设计研究院 | Spherical ess-strain monitoring device that is a kind of multi-direction and can combining |
| CN110132463A (en) * | 2018-02-09 | 2019-08-16 | 武汉理工大学 | A wireless signal transmission spherical earth pressure sensor |
| CN109682504A (en) * | 2019-01-04 | 2019-04-26 | 三峡大学 | The device and method of magnetic force utricule measurement crustal stress |
| CN109682504B (en) * | 2019-01-04 | 2020-11-06 | 三峡大学 | Device and method for measuring ground stress by magnetic capsule |
| CN112632676A (en) * | 2020-12-23 | 2021-04-09 | 华能澜沧江水电股份有限公司 | Concrete dam stress gradient monitoring method |
| CN112632676B (en) * | 2020-12-23 | 2022-10-11 | 华能澜沧江水电股份有限公司 | Concrete dam stress gradient monitoring method |
| CN113091962A (en) * | 2021-04-09 | 2021-07-09 | 交通运输部公路科学研究所 | A pavement pressure detection device |
| CN114323371A (en) * | 2021-12-22 | 2022-04-12 | 中铁七局集团有限公司 | Self-balancing concrete stress tester |
| CN114323371B (en) * | 2021-12-22 | 2022-11-04 | 中铁七局集团有限公司 | Self-balancing Concrete Stress Tester |
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| CN102322982B (en) | 2014-03-26 |
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