CN202110012U - Measuring device for measuring internal stress of concrete - Google Patents
Measuring device for measuring internal stress of concrete Download PDFInfo
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- CN202110012U CN202110012U CN2011202159921U CN201120215992U CN202110012U CN 202110012 U CN202110012 U CN 202110012U CN 2011202159921 U CN2011202159921 U CN 2011202159921U CN 201120215992 U CN201120215992 U CN 201120215992U CN 202110012 U CN202110012 U CN 202110012U
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- concrete
- stress
- measuring
- steel ring
- steel loop
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Abstract
A measuring device for measuring the internal stress of concrete comprises two hemispherical shells. The left hemispherical shell, the right hemispherical shell and a force measuring steel ring are assembled into a spherical cavity; the force measuring steel ring is provided with a plurality of gum base strain gauges; the spherical cavity is provided with a signal acquisition board; the gum base strain gauges are connected with the signal acquisition board through lead wires; and the signal acquisition board is connected with a signal transmission line. The measuring device is embedded into a concrete structure, the gum base strain gauges are equidistantly pasted to the inner surface of the force measuring steel ring, a strain cosine function curve on the surface of the force measuring steel ring is fitted according to the strain value measured by the surface of the force measuring steel ring, and the primary stress direction and the primary stress of the concrete are measured according to the phase angle and the amplitude of the function curve. The measuring device for measuring the internal stress of the concrete overcomes the shortcomings of difficulty in embedding and positioning and poor data reliability of an existing concrete internal structure stress monitoring strain meter group, and is especially suitable for measuring the internal stress of a mass concrete structure.
Description
Technical field
The utility model relates to a kind of measurement mechanism of inside concrete stress, belongs 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
The utility model technical matters to be solved provides a kind of measurement mechanism 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 utility model is taked 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.
The measurement mechanism of a kind of inside concrete stress of the utility model, dynamometry steel loop outside surface texturing or corrosion increase its roughness, help and concrete gluing.The whole device profile of the utility model 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 utility model is measured 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 utility model 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 utility model 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 the utility model device assembly drawing;
Fig. 3 is the utility model dynamometry steel loop paster synoptic diagram.
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.
In the utility model device, 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.
The utility model device is 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 (3)
1. the measurement mechanism of an inside concrete stress; Comprise the two halves spherical shell; It is characterized in that: left hemisphere shell (1), right hemispherical Shell (2) and dynamometry steel loop (3) are assembled into spherical cavity, and dynamometry steel loop (3) is provided with matrix foil gauge (4), and spherical cavity is provided with signal acquiring board (5); Matrix foil gauge (4) lead-in wire connects signal acquiring board (5), and signal acquiring board (5) is connected with signal transmssion line (6).
2. according to the measurement mechanism of the said a kind of inside concrete stress of claim 1, it is characterized in that: said dynamometry steel loop (3) inboard equidistantly is provided with a plurality of matrix foil gauges (4).
3. according to the measurement mechanism of claim 1 or 2 said a kind of inside concrete stress, it is characterized in that: said dynamometry steel loop (3) outside surface is a uneven surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202159921U CN202110012U (en) | 2011-06-24 | 2011-06-24 | Measuring device for measuring internal stress of concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202159921U CN202110012U (en) | 2011-06-24 | 2011-06-24 | Measuring device for measuring internal stress of concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202110012U true CN202110012U (en) | 2012-01-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202159921U Expired - Fee Related CN202110012U (en) | 2011-06-24 | 2011-06-24 | Measuring device for measuring internal stress of concrete |
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| CN (1) | CN202110012U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322982A (en) * | 2011-06-24 | 2012-01-18 | 三峡大学 | Device and method for measuring inner stress of concrete |
| CN106644201A (en) * | 2017-02-24 | 2017-05-10 | 福建省莆田市衡力传感器有限公司 | Hemispherical head friction sensor |
| CN106771102A (en) * | 2017-01-25 | 2017-05-31 | 厦门理工学院 | The measuring system and measuring method of Non-load Concrete internal stress in concrete structure |
-
2011
- 2011-06-24 CN CN2011202159921U patent/CN202110012U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102322982A (en) * | 2011-06-24 | 2012-01-18 | 三峡大学 | Device and method for measuring inner stress of concrete |
| CN102322982B (en) * | 2011-06-24 | 2014-03-26 | 三峡大学 | Device and method for measuring inner stress of concrete |
| CN106771102A (en) * | 2017-01-25 | 2017-05-31 | 厦门理工学院 | The measuring system and measuring method of Non-load Concrete internal stress in concrete structure |
| CN106644201A (en) * | 2017-02-24 | 2017-05-10 | 福建省莆田市衡力传感器有限公司 | Hemispherical head friction sensor |
| CN106644201B (en) * | 2017-02-24 | 2023-07-18 | 福建省莆田市衡力传感器有限公司 | Semispherical head friction sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120111 Termination date: 20120624 |