CN202869717U - Absolute stress detection apparatus for prestressed concrete bridge - Google Patents
Absolute stress detection apparatus for prestressed concrete bridge Download PDFInfo
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- CN202869717U CN202869717U CN 201220557037 CN201220557037U CN202869717U CN 202869717 U CN202869717 U CN 202869717U CN 201220557037 CN201220557037 CN 201220557037 CN 201220557037 U CN201220557037 U CN 201220557037U CN 202869717 U CN202869717 U CN 202869717U
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- 238000001514 detection method Methods 0.000 title claims abstract description 13
- 239000011513 prestressed concrete Substances 0.000 title claims abstract description 13
- 239000004567 concrete Substances 0.000 claims abstract description 23
- 238000013016 damping Methods 0.000 claims description 16
- 238000005259 measurement Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract description 5
- 210000004027 cell Anatomy 0.000 description 33
- 230000006698 induction Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000011888 foil Substances 0.000 description 3
- 230000033001 locomotion Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 210000002421 cell wall Anatomy 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
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- Force Measurement Appropriate To Specific Purposes (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The utility model discloses an absolute stress detection apparatus for a prestressed concrete bridge. A strain gauge is attached to the surface of a concrete bridge body to be detected; a force measurement device is connected with a force application surface of a force application device and then the force measurement device and the force application device are placed inside a groove on the surface of the concrete bridge body so as to detect the stress applied inside the opening by the force application device; a control device is connected with an acquisition instrument, the force measurement device, and the force application device to send force application signals to a control end of the force application device; and when the strain of an output end of the acquisition instrument returns to an initial value, the stress of an output terminal of the force measurement device is acquired as the absolute stress. The absolute stress detection apparatus for the prestressed concrete bridge is mainly used for the stress detection in the bridge concrete structure field; the apparatus is capable of directly measuring out the magnitude and the direction of the absolute stress of the bridge body without being influenced by the temperature change generated during the grooving or the difficulty of the determination of the concrete elastic modulus; and the apparatus is advantaged by accurate measurement results and simple measurement processes.
Description
Technical field
The utility model relates to the measurement of bridge absolute stress, relates in particular to Prestressed Concrete Bridges absolute stress pick-up unit.
Background technology
Absolute stress is also referred to as working stress or permanent stress, refers to the summation of the actual stress that various loads, distortion and effect of contraction structurally produce.Wherein load has comprised bridge structure deadweight, car weight, wind and snow load etc.Distortion and effect of contraction refer to the factors such as temperature, displacement, distortion, foundation uneven settlement.The accurate detection of absolute stress has vital role to determining the present stress level of bridge structure, following stress safety margin.
At present, the equipment that traditional stress measurement is mainly adopted is strain gauge transducer, is also referred to as foil gauge.The method of using normally passes through to measure the strain variation of pontic foil gauge when unloaded and carrying, multiply by elastic modulus again, draws the absolute stress of bridge structure.But the defective of the method is, is merely able to measure the relative changing value who pastes structural stress behind the strainometer, can't record the stress value that structure has produced before pasting strainometer.On the other hand, in the computation process of strain derivation stress, owing to concrete elastic modulus is difficult to determine, also can cause testing result inaccurate.
The utility model content
In order to have solved the low problem of absolute stress measuring accuracy in the above-mentioned prior art, the utility model provides a kind of Prestressed Concrete Bridges absolute stress pick-up unit, can record comparatively accurately the absolute stress of bridge concrete structure.
Prestressed Concrete Bridges absolute stress pick-up unit of the present utility model comprises the Acquisition Instrument that is connected with strainometer, also comprises force application apparatus, device for measuring force and control device.
Strainometer and concrete bridge to be detected surface attach.
Device for measuring force is connected with the force application apparatus force surface, places described concrete bridge surface fluting, puts on stress in the described fluting for detection of force application apparatus.
The control device input end is connected with Acquisition Instrument output terminal, device for measuring force output terminal respectively, and the control device output terminal is connected with the force application apparatus control end.Send application of force signal to described force application apparatus control end, make the strain of Acquisition Instrument output terminal be returned to initial value after, gathering device for measuring force output terminal stress is absolute stress.Thus, can directly draw absolute stress, and foil gauge is affected not quite by variation of ambient temperature in the measuring process, also do not need to determine modulus of elasticity of concrete, the testing result that obtains is comparatively accurate.
In some embodiments, electric resistance wire strain gauge is counted in described strain, described force application apparatus is: Miniature hydraulic jick, described device for measuring force are miniature force cell.The size of Miniature hydraulic jick and miniature force cell can satisfy inserts the requirement of carrying out the application of force in the fluting.
In some embodiments, described device for measuring force is connected with the force application apparatus force surface and comprises: described Miniature hydraulic jick piston end surface is fixedly connected with miniature force cell sensitive surface.Thus, miniature force cell can bear and respond to the stress that applies from the jack pair cell wall exactly.
In some embodiments, described strainometer and concrete bridge to be detected surface attach, also comprise, the strain rosette support, described strain rosette support comprises: main support and strainometer fixed mount, described main support is strain rosette connecting line shape, subsides accord with in described concrete bridge to be detected surface, described strainometer fixed mount is fixed on the described main support strain rosette connecting line, the strain rosette structure is answered in formation, and described strainometer is fixed in to paste in the described strainometer fixed mount and accords with in described concrete bridge to be detected surface.
In some embodiments, device for measuring force is connected with the force application apparatus force surface, place described concrete bridge surface fluting, the stress that puts in the described fluting for detection of force application apparatus also comprises: a plurality of device for measuring force are connected with the force surface of a plurality of force application apparatus, place respectively the strain rosette fluting of described concrete bridge surface, put on stress in the described strain rosette fluting for detection of force application apparatus.
In some embodiments, described control device input end is connected with Acquisition Instrument output terminal, device for measuring force output terminal respectively, and the control device output terminal is connected with the force application apparatus control end; Send application of force signal to described force application apparatus control end, after making the strain of Acquisition Instrument output terminal be returned to initial value, gathering device for measuring force output terminal stress is that absolute stress also comprises: in strain rosette, according to strainometer quantity a plurality of control device are set, each control device input end is connected with Acquisition Instrument output terminal, device for measuring force output terminal respectively, and the control device output terminal is connected with the force application apparatus control end; Send application of force signal to described force application apparatus control end, make the strain of Acquisition Instrument output terminal be returned to initial value after, gather device for measuring force output terminal stress and be the component of stress in the strain rosette, obtain principle stress and principal direction of stress according to a plurality of components of stress.Thus, the absolute stress pick-up unit can further detect the direction that obtains stress.
In some embodiments, described Miniature hydraulic jick piston end surface surface is the sawtooth texture, and the sensitive surface that miniature force cell is fixedly connected with described piston area is corresponding sawtooth texture.Thus, miniature force cell can be combined with Miniature hydraulic jick better, exports exactly the stress numerical that force application apparatus applies.
In some embodiments, also comprise: damping gasket, described damping gasket place between described Miniature hydraulic jick piston end surface and the sensitive surface that described miniature force cell is fixedly connected with, and the surface has the sawtooth texture.Thus, damping gasket can produce anti-skidding effect between joint face, so that testing result is more accurate.
In some embodiments, described Miniature hydraulic jick piston end surface middle part be projection, and the sensitive surface that miniature force cell is fixedly connected with described piston area is for annular accordingly, can with the described clearance fit that convexes to form.Thus, miniature force cell can be combined with Miniature hydraulic jick better, increases the accuracy that records numerical value.
In some embodiments, also comprise: damping gasket, described damping gasket places between the sensitive surface loop configuration that described Miniature hydraulic jick piston end surface middle part is protruding with described miniature force cell is fixedly connected with, and damping gasket thickness is less than described height of projection.Thus, damping gasket can produce anti-skidding effect between joint face, so that testing result is more accurate.
Description of drawings
Fig. 1 is the structural representation of the utility model Prestressed Concrete Bridges absolute stress pick-up unit;
Fig. 2 is the schematic diagram of Miniature hydraulic jick and miniature force cell coupling part among Fig. 1;
Fig. 3 is the strain rosette structure of the utility model Prestressed Concrete Bridges absolute stress pick-up unit.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in further detail, but not as to restriction of the present utility model.
As shown in Figure 1 and Figure 2, Prestressed Concrete Bridges absolute stress pick-up unit of the present utility model comprises electric resistance wire strain gauge 1, Acquisition Instrument 2, Miniature hydraulic jick 3, miniature force cell 4 and control device 5.Electric resistance wire strain gauge 1 is connected with Acquisition Instrument 2.Miniature hydraulic jick 3 is connected with miniature force cell 4.The input end of control device 5 respectively with the output terminal of Acquisition Instrument 2 be connected the output terminal of force cell 4 and be connected, the output terminal of control device 5 is connected with the control end of Miniature hydraulic jick 3.
Electric resistance wire strain gauge 1 mainly comprises pedestal 11, sensitive grid 12 and go between 13.Sensitive grid 12 is fixedly linked on the pedestal 11, and sensitive grid 12 is connected with lead-in wire 13.Lead-in wire 13 is connected with the input end of Acquisition Instrument 2.
Miniature hydraulic jick 3 mainly comprises cylinder body 31, piston 32, hydraulic interface.Cylinder body 31 is cylindrical structure, is provided with the opening for piston 32 motions at the top, thus vertically to-and-fro movement of piston 32.The end face middle part of piston 32 is formed with projection 321, is used for being connected with miniature force cell 4.The bottom of cylinder body 31 is provided with hydraulic interface, is connected by the propulsion system of hydraulic interface with the outside, for Miniature hydraulic jick 3 provides power.
Miniature force cell 4 mainly comprises induction end 41, data line 42.Induction end 41 be a side surface with the cylindrical structure of annular protrusion, can be made by alloy material, be used for bearing and respond to load from the outside.On the induction end 41, the surface that is fixedly connected with piston 32 end faces is provided with and projection 321 corresponding loop configuration, and thus, projection 321 is connected with loop configuration.Be circumscribed with data line 42 on the sidewall of induction end 41, the other end of data line 42 is output terminal, is used for exporting the data-signal that records to control device.
Miniature hydraulic jick 3 is connected with miniature force cell 4.Wherein, in piston 32 upper ends of Miniature hydraulic jick 3 described miniature force cell 4 is installed.Form depression in the middle of the annular protrusion of miniature force cell 4 induction end 41, this depression can form clearance fit with piston 32 head face humps 321.Absolute stress pick-up unit of the present utility model also comprises damping gasket 7.Damping gasket 7 places between projection 321 and the loop configuration.The thickness of damping gasket 7 is less than the height of projection 321.Thus, damping gasket 7 can play anti-skidding effect, makes testing result more accurate.In other embodiments, Miniature hydraulic jick 3 can also be that sawtooth is connected with miniature force cell 4.Specifically, piston 32 end face surface are the sawtooth texture, and a side surface of the induction end 41 that miniature force cell 4 is fixedly connected with piston 32 end faces also is corresponding sawtooth texture.Like this, miniature force cell 4 is fixedly connected with Miniature hydraulic jick 3.The axis of maintenance induction end 41 and the axis of piston 32 are on the same straight line.Thus, can make the induction end 41 of miniature force cell 2 can accurately respond to top power from Miniature hydraulic jick 3.
Prestressed Concrete Bridges absolute stress pick-up unit of the present utility model is worked as follows: electric resistance wire strain gauge 1 attaches with concrete bridge to be detected surface.The Acquisition Instrument 2 that links to each other with electric resistance wire strain gauge 1 gathers the initial strain value of this moment, and the signal of this information is transferred to control device 5 by output terminal.At this concrete bridge surface fluting, miniature force cell 4 is connected with force surface piston 32 end faces of Miniature hydraulic jick 3, place in the fluting, split the top power that cell wall applies for detection of Miniature hydraulic jick 3.Behind the fluting, strain value changes and is not equal to the initial strain value, and this signal is transferred to control device 5.Control device 5 is to the electromagnetic signal of the control end output beginning application of force of Miniature hydraulic jick 3.External motive device is started working, the piston 32 outside jack-up of Miniature hydraulic jick 3.The miniature force cell 4 that is fixedly connected with piston 32 upper ends is thereupon motion also, and when miniature force cell 4 induction end 41 other end Surface Contact body of wall, the absolute stress pick-up unit begins to produce top power to pontic.Simultaneously, accurately induction is from pressure and the output signal of piston 32 for the induction end 41 of miniature force cell 4, and signal is transported in the control device 5 that is connected with output terminal by data line 42.After Miniature hydraulic jick 3 was started working, control device 5 carried out computing always, and whether the strain value that is relatively received by Acquisition Instrument equals the initial strain value.If be not equal to, output signal not; If equal, then stop the signal of the application of force to the control end output of Miniature hydraulic jick 3, and collection miniature force cell 4 output terminal stress this moment are absolute stress.
Be illustrated in figure 3 as the strain rosette structure of the utility model Prestressed Concrete Bridges absolute stress pick-up unit.Be with the difference of above-mentioned embodiment, strainometer and concrete bridge to be detected surface attach according to strain rosette 61, and strainometer 1 can be fixed with 62 positions and be attached at concrete bridge to be detected surface formation strain rosette structure.
Difference also is, a plurality of miniature force cells 4 are connected with the force surface of the piston 32 of a plurality of Miniature hydraulic jicks 3, place respectively the strain rosette fluting of concrete bridge surface, put on stress in the strain rosette fluting for detection of Miniature hydraulic jick 3.
During work, the input end of control device 5 respectively with the output terminal of Acquisition Instrument 2 be connected the output terminal of force cell 4 and be connected, the output terminal of control device 5 is connected with the control end of Miniature hydraulic jick 3.Send application of force signal to Miniature hydraulic jick 3 control ends, make the strain of Acquisition Instrument output terminal be returned to initial value after, gathering miniature force cell 4 output terminal stress is absolute stress.In the strain rosette structure of present embodiment, according to strainometer quantity a plurality of control device 5 are set.Each control device 5 input end is connected with Acquisition Instrument 2 output terminals, miniature force cell 4 output terminals respectively, and control device 5 output terminals are connected with Miniature hydraulic jick 3 control ends.Send application of force signal to Miniature hydraulic jick 3 control ends, make Acquisition Instrument 2 output terminal strains be returned to initial value after, gather miniature force cell 4 output terminal stress and be the component of stress in the strain rosette, obtain principle stress and principal direction of stress according to a plurality of components of stress.Thus, can obtain simultaneously the size and Orientation of absolute stress.
Above-described only is embodiments more of the present utility model.For the person of ordinary skill of the art, under the prerequisite that does not break away from the utility model creation design, can also make some distortion and improvement, these all belong to protection domain of the present utility model.
Claims (9)
1. Prestressed Concrete Bridges absolute stress pick-up unit comprises the Acquisition Instrument that is connected with strainometer, it is characterized in that, also comprise, and force application apparatus, device for measuring force and control device, wherein,
Strainometer and concrete bridge to be detected surface attach;
Device for measuring force is connected with the force application apparatus force surface, places described concrete bridge surface fluting, puts on stress in the described fluting for detection of force application apparatus;
The control device input end is connected with Acquisition Instrument output terminal, device for measuring force output terminal respectively, and the control device output terminal is connected with the force application apparatus control end; Send application of force signal to described force application apparatus control end, make the strain of Acquisition Instrument output terminal be returned to initial value after, gathering device for measuring force output terminal stress is absolute stress.
2. pick-up unit as claimed in claim 1 is characterized in that, electric resistance wire strain gauge is counted in described strain, described force application apparatus is: Miniature hydraulic jick, described device for measuring force are miniature force cell.
3. pick-up unit as claimed in claim 2 is characterized in that, described device for measuring force is connected with the force application apparatus force surface and comprises: described Miniature hydraulic jick piston end surface is fixedly connected with miniature force cell sensitive surface.
4. pick-up unit as claimed in claim 1, it is characterized in that, device for measuring force is connected with the force application apparatus force surface, place described concrete bridge surface fluting, the stress that puts in the described fluting for detection of force application apparatus also comprises: a plurality of device for measuring force are connected with the force surface of a plurality of force application apparatus, place respectively the strain rosette fluting of described concrete bridge surface, put on stress in the described strain rosette fluting for detection of force application apparatus.
5. pick-up unit as claimed in claim 4 is characterized in that, described control device input end is connected with Acquisition Instrument output terminal, device for measuring force output terminal respectively, and the control device output terminal is connected with the force application apparatus control end; Send application of force signal to described force application apparatus control end, after making the strain of Acquisition Instrument output terminal be returned to initial value, gathering device for measuring force output terminal stress is that absolute stress also comprises: in strain rosette, according to strainometer quantity a plurality of control device are set, each control device input end is connected with Acquisition Instrument output terminal, device for measuring force output terminal respectively, and the control device output terminal is connected with the force application apparatus control end; Send application of force signal to described force application apparatus control end, make the strain of Acquisition Instrument output terminal be returned to initial value after, gather device for measuring force output terminal stress and be the component of stress in the strain rosette, obtain principle stress and principal direction of stress according to a plurality of components of stress.
6. pick-up unit as claimed in claim 3 is characterized in that, described Miniature hydraulic jick piston end surface surface is the sawtooth texture, and the sensitive surface that miniature force cell is fixedly connected with described piston area is corresponding sawtooth texture.
7. pick-up unit as claimed in claim 6 is characterized in that, also comprises: damping gasket, described damping gasket place between described Miniature hydraulic jick piston end surface and the sensitive surface that described miniature force cell is fixedly connected with, and the surface has the sawtooth texture.
8. pick-up unit as claimed in claim 3 is characterized in that, described Miniature hydraulic jick piston end surface middle part be projection, and the sensitive surface that miniature force cell is fixedly connected with described piston area is for annular accordingly, can with the described clearance fit that convexes to form.
9. pick-up unit as claimed in claim 8, it is characterized in that, also comprise: damping gasket, described damping gasket places between the sensitive surface loop configuration that described Miniature hydraulic jick piston end surface middle part is protruding with described miniature force cell is fixedly connected with, and damping gasket thickness is less than described height of projection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220557037 CN202869717U (en) | 2012-10-26 | 2012-10-26 | Absolute stress detection apparatus for prestressed concrete bridge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220557037 CN202869717U (en) | 2012-10-26 | 2012-10-26 | Absolute stress detection apparatus for prestressed concrete bridge |
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| CN202869717U true CN202869717U (en) | 2013-04-10 |
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| CN 201220557037 Expired - Fee Related CN202869717U (en) | 2012-10-26 | 2012-10-26 | Absolute stress detection apparatus for prestressed concrete bridge |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316230A (en) * | 2014-11-18 | 2015-01-28 | 大连海事大学 | Method and device for measuring vector force borne by cylindrical beam |
| CN106197778A (en) * | 2016-07-15 | 2016-12-07 | 上海数久信息科技有限公司 | A kind of appraisal procedure of the effective prestress of servicing bridges |
| CN108253923A (en) * | 2017-12-25 | 2018-07-06 | 中冶建筑研究总院有限公司 | A kind of prepackage caliberating device |
| CN113324686A (en) * | 2021-05-26 | 2021-08-31 | 中冶建筑研究总院有限公司 | Method for detecting prestress and temperature shrinkage stress through concrete surface stress release |
| CN113785177A (en) * | 2019-06-25 | 2021-12-10 | 喜利得股份公司 | Sensor for detecting mechanical stress on battery pack |
-
2012
- 2012-10-26 CN CN 201220557037 patent/CN202869717U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104316230A (en) * | 2014-11-18 | 2015-01-28 | 大连海事大学 | Method and device for measuring vector force borne by cylindrical beam |
| CN106197778A (en) * | 2016-07-15 | 2016-12-07 | 上海数久信息科技有限公司 | A kind of appraisal procedure of the effective prestress of servicing bridges |
| CN106197778B (en) * | 2016-07-15 | 2019-01-15 | 上海数久信息科技有限公司 | A kind of appraisal procedure of the effective prestress of servicing bridges |
| CN108253923A (en) * | 2017-12-25 | 2018-07-06 | 中冶建筑研究总院有限公司 | A kind of prepackage caliberating device |
| CN108253923B (en) * | 2017-12-25 | 2024-02-09 | 中冶建筑研究总院有限公司 | Preassembling calibration device |
| CN113785177A (en) * | 2019-06-25 | 2021-12-10 | 喜利得股份公司 | Sensor for detecting mechanical stress on battery pack |
| CN113785177B (en) * | 2019-06-25 | 2024-05-07 | 喜利得股份公司 | Sensor for detecting mechanical stress on battery pack |
| CN113324686A (en) * | 2021-05-26 | 2021-08-31 | 中冶建筑研究总院有限公司 | Method for detecting prestress and temperature shrinkage stress through concrete surface stress release |
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Granted publication date: 20130410 Termination date: 20131026 |