CN105841853A - Novel ring core-based device for testing existing stress of concrete - Google Patents
Novel ring core-based device for testing existing stress of concrete Download PDFInfo
- Publication number
- CN105841853A CN105841853A CN201610193077.4A CN201610193077A CN105841853A CN 105841853 A CN105841853 A CN 105841853A CN 201610193077 A CN201610193077 A CN 201610193077A CN 105841853 A CN105841853 A CN 105841853A
- Authority
- CN
- China
- Prior art keywords
- drill bit
- lifting platform
- concrete
- ring core
- base
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004567 concrete Substances 0.000 title claims abstract description 23
- 238000012360 testing method Methods 0.000 title claims abstract description 23
- 239000000835 fiber Substances 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000013307 optical fiber Substances 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 3
- 239000011888 foil Substances 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 2
- 238000005553 drilling Methods 0.000 abstract description 7
- 230000005489 elastic deformation Effects 0.000 abstract description 4
- 238000010276 construction Methods 0.000 description 6
- 239000011513 prestressed concrete Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 241001074085 Scophthalmus aquosus Species 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
- G01L1/246—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre using integrated gratings, e.g. Bragg gratings
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a novel ring core-based device for testing the existing stress of the concrete. The base of the device is provided with a vertical slide rail. A lifting platform is mounted on the slide rail. The lifting platform is controlled to move along the slide rail by means of a screw-nut mechanism. A drill bit base is fixed on the lifting platform. A drill bit is mounted on the drill bit base. An engine is mounted on the lifting platform. The power of the engine drives the drill bit to rotate via a gear-belt mechanism. A fiber grating strain sensor is positioned on the surface of the concrete for core drilling at the front end of the drill bit. The data line of the fiber grating strain sensor is led out of the central-axis part of the drill bit and the drill bit base to be connected with a fiber demodulator fixed on the base. During the drilling process, a constraint around a core sample is released and the elastic deformation is generated. Inside the drill bit, a fiber grating sensor or a resistance strain gage stuck onto the surface of the core sample can accurately detect the elastic deformation and then transmits data to a signal demodulator arranged on the base for recording and analyzing the data.
Description
Technical field
The invention belongs to building foundation engineering construction and detection field, be specifically related to a kind of novel ring core test existing stress of concrete
Device, this device is based on Stress Release measure theory, in conjunction with fiber-optic grating sensor or strain gage testing system and annular distance
Coring method and develop, for detecting the existing stress of xoncrete structure.
Background technology
In xoncrete structure, prestressing force has played significant role.Especially in highway bridge, Prestressed Concrete Bridges should
With the widest.Showing according to statistics, in the last thirty years, in the built concrete-bridge of China, Prestressed Concrete Bridges accounts for more than 75%.
The design reference period of highway in China bridges and culverts structure is 100 years at present.After bridge builds up, need to detect, whether assess it
Reach to design requirement.During bridge operation, due to natural environment and the long term of vehicular load, it is inevitably generated damage
Wound accumulation and degradation resistance, structural behaviour produces change, it is also desirable to periodically the reliability of these bridges is effectively detected and is commented
Estimate, it is ensured that structural safety.
The assessment of Prestressed Concrete Bridges, the precondition of maintenance and reinforcement and enhancing, be it needs to be determined that the work shape of structure in service
State.Existing stress is an important indicator of evaluation structure service state, only passes through design drawing, it then follows corresponding specification, from reason
Existing stress during calculating determines prestressed reinforced concrete construction in opinion, can produce bigger deviation with practical situation, the most also not have
A kind of measuring method with enough accuracy can effectively be measured and assess by stress existing to existing prestressed reinforced concrete construction.
Comparatively speaking, stress free method is to measure prestressed concrete beam existing stress more effective method.The method basic
Principle is to the test member with primary stress, uses the method for machine cuts to make the stress of cutting cube be released, and uses survey
The strain discharging district before and after cutting is tested by test instrument, draws the stress state of component according to the constitutive relation of material.
Summary of the invention
Based on the drill core fluting release measuring principle of stress and fiber grating or resistance strain measurement technology, the present invention provides a kind of new
The device of the type ring core test existing stress of concrete and application process thereof.
The technical solution used in the present invention is:
The device of a kind of novel ring core test existing stress of concrete, including support, lifting platform, electromotor, drill bit base, brill
Head, fiber Bragg grating strain sensor or resistance strain gage, conduit and signal (FBG) demodulator,
Described support, equipped with road wheel, support is additionally provided with the slide rail of vertical direction, and lifting platform is arranged on slide rail, by silk
The movement on slide rail of the stem nut mechanism controls lifting platform, screw mandrel upper end is provided with handle wheel,
Drill bit base is fixed on lifting platform, and drill bit is arranged on drill bit base, and electromotor is arranged on lifting platform, electromotor
Power drives bit by tooth belt mechanism,
Fiber Bragg grating strain sensor or resistance strain gage are positioned at the concrete surface treating drill core position of chisel edge, fiber grating
The data wire of strain transducer or resistance strain gage derives and is connected to solid from the conduit at the axis position of drill bit and drill bit base
The signal (FBG) demodulator being scheduled on support.
Fiber-optic grating sensor is long gauge length optical fibre grating sensor.
The thin slice waterproof and heat-insulating that is encapsulated as of fiber-optic grating sensor encapsulates.
Drill bit chassis interior is provided with micro pump, and drill bit base top is provided with blasthole.
Conduit is open circles cross section shape, is placed on the location mid-shaft of drill bit and drill bit base, fiber Bragg grating strain sensor or electricity
The data wire of resistance foil gauge passes from conduit center, is not affected by the rotation of drill bit.
Support is provided with the snap close in order to fixing conduit, signal (FBG) demodulator also has a draw-in groove conduit is fixed.
The invention has the beneficial effects as follows, while prestressed concrete is carried out boring and coring, it is possible to pass through optical fiber grating sensing
The stress state drilled through within object is detected by device or resistance strain gage, and testing result is accurate, for the security performance of structure
Assessment provides reliable data support.Not only increase the service efficiency of construction machinery equipment, more improve whole engineering construction
Efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation one of the device of the novel ring core of the present invention test existing stress of concrete.
Fig. 2 is the structural representation two of the device of the novel ring core of the present invention test existing stress of concrete.
Fig. 3 is the structural representation three of the device of the novel ring core of the present invention test existing stress of concrete.
Fig. 4 is the structural representation four of the device of the novel ring core of the present invention test existing stress of concrete.
Fig. 5 is the structural representation five of the device of the novel ring core of the present invention test existing stress of concrete.
Fig. 6 is the top view of the device of the novel ring core of the present invention test existing stress of concrete.
Detailed description of the invention
In order to describe construction features and the concrete operation step of the present invention in detail, now for embodiment and coordinate accompanying drawing to illustrate.
The device of a kind of novel ring core test existing stress of concrete, including at the bottom of support 1, lifting platform 11, electromotor 2, drill bit
Seat 3, drill bit 5, fiber Bragg grating strain sensor or resistance strain gage 6, conduit 7 and signal (FBG) demodulator 8,
Described support 1, equipped with road wheel, support 1 is additionally provided with the slide rail 13 of vertical direction, and lifting platform 11 is arranged on slide rail
On 13, controlling the lifting platform 11 movement on slide rail by leading screw and nut mechanism, screw mandrel 14 upper end is provided with handle wheel 12, when
When forward and backward fixed handle takes turns 12, lifting platform 11 along slide rail raising and lowering, thus can control creeping into and lifting of drill bit 5,
Drill bit base 3 is fixed on lifting platform 11, and drill bit 5 is arranged on drill bit base 3, and electromotor 2 is arranged on lifting platform
On cushion cap in the middle part of in the of 11, the power of electromotor 2 drives drill bit 5 to rotate by tooth belt mechanism 15,
The drill core position selected pastes fiber Bragg grating strain sensor or resistance strain gage 6, fiber grating strain in advance
Sensor or resistance strain gage 6 are positioned at drill bit 5 front end, and the data wire of fiber Bragg grating strain sensor or resistance strain gage 6 is from brill
5 and drill bit base 3 axis position conduit 7 in derive and be connected to the signal (FBG) demodulator 8 that is fixed on support 1.
Fiber-optic grating sensor 6 is long gauge length optical fibre grating sensor.
The thin slice waterproof and heat-insulating that is encapsulated as of fiber-optic grating sensor 6 encapsulates.
Drill bit base 3 is internally installed micro pump, and drill bit base 3 top is provided with blasthole 4.
Conduit 7 is open circles cross section shape, is placed on the location mid-shaft of drill bit 5 and drill bit base 3, fiber grating strain sensor
The data wire of device or resistance strain gage 6 passes from conduit 7 center, is not affected by drill bit 5 rotation.
Support 1 is provided with the snap close 9 in order to fixing conduit 7, signal (FBG) demodulator 8 also has a draw-in groove to conduit 7
It is fixed.
The present invention in use, implements step as follows:
1, the position of selected good boring and coring, pastes the fiber-optic grating sensor encapsulated through insulating water-proof or resistance strain gage
In the central authorities of coring position, data wire, to specifying position, is accessed support through conduit by the mobile core-drilling machine support that is well placed
On signal (FBG) demodulator in, lock snap close.
2, suitable hollow boring bit it is installed to drill bit base, fixes core-drilling machine support, it is to avoid during boring, produce displacement.
Blasthole, other end water receiving source are accessed in water pipe one end.Ensure that drill bit has when creeping into the water of abundance to cool down it, prevent
Drill bit generation high temperature.
3, start electromotor, rotate rotary handle gently, in the front 5mm degree of depth that drill bit creeps into, it should keep slowly creeping into,
Can suitably promote rate of penetration afterwards.
4, in drill bit drilling process, the constraint around core sample is released, and produces elastic deformation, and this deformation will be by optical fiber light
Gate sensor or resistance strain gage detect, and by data by data wire input signal (FBG) demodulator.
5, after boring reaches desired depth, opposite direction rotates rotary handle, and drill bit is raised out core sample surface, closes power supply,
Close water source.
When core-drilling machine is holed when, the constraint around core sample is released, and produces elastic deformation, pastes in drill bit
Its deformation can accurately be detected by fiber-optic grating sensor or resistance strain gage on core sample surface, and by data wire by data
Record analysis is carried out in signal (FBG) demodulator on incoming support.
Fiber-optic grating sensor or resistance strain gage is pasted, to prestressed concrete at the upper surface center needing the core sample drilled through
The when of carrying out core boring sampling, when drilling depth reaches to a certain degree, the working stress at measuring point is released completely, by passing
Sensor measures its strain relief value, calculates the principal stress size and Orientation at measuring point further according to theory of elastic mechanics.
This device installs a hollow core conductor pipe on the axis of drill bit, when drill bit is implemented to creep into, and fiber-optic grating sensor or electricity
The data wire of resistance foil gauge is switched to outside by conduit, accesses in the signal (FBG) demodulator on support, carries out data analysis.
Fiber-optic grating sensor or resistance strain gage are thermally shielded waterproof enclosure, it is to avoid high temperature and outside when drill bit creeps into are logical
The cooling water entered produces impact to the accuracy of detection of sensor.
Fiber Bragg grating strain sensor and optical fibre interrogation instrument may be used without resistance strain gage sensor and (FBG) demodulator is replaced.
Claims (6)
1. the device of the novel ring core test existing stress of concrete, it is characterised in that: include support, lifting platform, electromotor,
Drill bit base, drill bit, fiber Bragg grating strain sensor or resistance strain gage, conduit and signal (FBG) demodulator,
Described support, equipped with road wheel, support is additionally provided with the slide rail of vertical direction, and lifting platform is arranged on slide rail, by silk
The movement on slide rail of the stem nut mechanism controls lifting platform, screw mandrel upper end is provided with handle wheel,
Drill bit base is fixed on lifting platform, and drill bit is arranged on drill bit base, and electromotor is arranged on lifting platform, electromotor
Power drives bit by tooth belt mechanism,
Fiber Bragg grating strain sensor or resistance strain gage are positioned at the concrete surface treating drill core position of chisel edge, fiber grating
The data wire of strain transducer or resistance strain gage derives and is connected to solid from the conduit at the axis position of drill bit and drill bit base
The signal (FBG) demodulator being scheduled on support.
2. test device and the application process of the existing stress of concrete according to a kind of novel ring core described in claim, its feature exists
In: fiber-optic grating sensor is long gauge length optical fibre grating sensor.
3. test device and the application process of the existing stress of concrete according to a kind of novel ring core described in claim, its feature exists
In: the thin slice waterproof and heat-insulating that is encapsulated as of fiber-optic grating sensor encapsulates.
4. test device and the application process of the existing stress of concrete according to a kind of novel ring core described in claim, its feature exists
In: drill bit chassis interior is provided with micro pump, and drill bit base top is provided with blasthole.
5. test device and the application process of the existing stress of concrete according to a kind of novel ring core described in claim, its feature exists
In: conduit is open circles cross section shape, is placed on the location mid-shaft of drill bit and drill bit base, fiber Bragg grating strain sensor or electricity
The data wire of resistance foil gauge passes from conduit center, is not affected by the rotation of drill bit.
6. test device and the application process of the existing stress of concrete according to a kind of novel ring core described in claim, its feature exists
In: on support, it is provided with the snap close in order to fixing conduit, signal (FBG) demodulator also has a draw-in groove conduit is fixed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610193077.4A CN105841853A (en) | 2016-03-30 | 2016-03-30 | Novel ring core-based device for testing existing stress of concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610193077.4A CN105841853A (en) | 2016-03-30 | 2016-03-30 | Novel ring core-based device for testing existing stress of concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105841853A true CN105841853A (en) | 2016-08-10 |
Family
ID=56584387
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610193077.4A Pending CN105841853A (en) | 2016-03-30 | 2016-03-30 | Novel ring core-based device for testing existing stress of concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105841853A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109696263A (en) * | 2019-02-21 | 2019-04-30 | 广西大学 | A kind of device and test method for testing the existing stress of concrete |
| CN112414936A (en) * | 2020-11-10 | 2021-02-26 | 山东大学 | Tunnel mechanical characteristic detection system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002081999A (en) * | 2000-09-05 | 2002-03-22 | Komiyama Kogyo:Kk | Method for measuring residual strain and residual stress, and stress release device therefor |
| CN202002759U (en) * | 2010-12-29 | 2011-10-05 | 中国建筑第七工程局有限公司 | Drilling tool for testing residual stress of aluminum oxide decomposing tank |
| KR20120006772A (en) * | 2010-07-13 | 2012-01-19 | 케이.엘.이.에스 주식회사 | Apparatus for measuring residual stress |
| CN203772455U (en) * | 2014-02-21 | 2014-08-13 | 同济大学 | Drilling instrument for residual stress determination |
| CN104034453A (en) * | 2014-06-05 | 2014-09-10 | 同济大学 | Step-by-step drill collar based concrete bridge single-shaft in situ stock stress detection method |
| CN204115919U (en) * | 2014-09-30 | 2015-01-21 | 徐州工程学院 | Portable residual stress test device |
| CN104535387A (en) * | 2014-12-16 | 2015-04-22 | 广西大学 | Slot cutting machine for measuring residual stress by adopting ring core method |
-
2016
- 2016-03-30 CN CN201610193077.4A patent/CN105841853A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002081999A (en) * | 2000-09-05 | 2002-03-22 | Komiyama Kogyo:Kk | Method for measuring residual strain and residual stress, and stress release device therefor |
| KR20120006772A (en) * | 2010-07-13 | 2012-01-19 | 케이.엘.이.에스 주식회사 | Apparatus for measuring residual stress |
| CN202002759U (en) * | 2010-12-29 | 2011-10-05 | 中国建筑第七工程局有限公司 | Drilling tool for testing residual stress of aluminum oxide decomposing tank |
| CN203772455U (en) * | 2014-02-21 | 2014-08-13 | 同济大学 | Drilling instrument for residual stress determination |
| CN104034453A (en) * | 2014-06-05 | 2014-09-10 | 同济大学 | Step-by-step drill collar based concrete bridge single-shaft in situ stock stress detection method |
| CN204115919U (en) * | 2014-09-30 | 2015-01-21 | 徐州工程学院 | Portable residual stress test device |
| CN104535387A (en) * | 2014-12-16 | 2015-04-22 | 广西大学 | Slot cutting machine for measuring residual stress by adopting ring core method |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109696263A (en) * | 2019-02-21 | 2019-04-30 | 广西大学 | A kind of device and test method for testing the existing stress of concrete |
| CN112414936A (en) * | 2020-11-10 | 2021-02-26 | 山东大学 | Tunnel mechanical characteristic detection system and method |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160810 |