CN206037977U - Fracture width changes dynamic monitoring device based on response of meeting an emergency - Google Patents
Fracture width changes dynamic monitoring device based on response of meeting an emergency Download PDFInfo
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- CN206037977U CN206037977U CN201621024277.9U CN201621024277U CN206037977U CN 206037977 U CN206037977 U CN 206037977U CN 201621024277 U CN201621024277 U CN 201621024277U CN 206037977 U CN206037977 U CN 206037977U
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Abstract
The utility model discloses a fracture width changes dynamic monitoring device based on response of meeting an emergency mainly comprises base support, induction rod, transmission spring and the induction system that meets an emergency, and the meet an emergency change value of induction system test on induction rod of meeting an emergency is adopted in the transmission spring of the certain rigidity of its adoption and the connection combination that induction rod necessarily constructed, and the change of calculating fracture width through mechanics and materialogy principle is worth to realize the dynamic monitoring of fracture width change. In view of the above, the inventor still design and production corresponding monitoring method. Use this monitoring method and device, combine the rigidity based on the spring that the inventor derived through mechanics of materials and structural mechanics method, induction rod's physical characteristic's high accuracy fracture width to change solution formula, can realize fracture width's change dynamic identification and monitoring, reduce people's mechanics of materials 0 and mechanics of materials 1, can extensively be applicable to discernment and monitoring that fracture width such as dam, mechanics of materials 2, mechanics of materials 3 change.
Description
Technical field
This utility model belongs to fracture width change identification and monitoring technical field, more particularly to a kind of based on strain sensing
Fracture width change dynamic monitor.
Background technology
In current civil engineering industry, the xoncrete structure such as building construction, railway, bridge, dam due to material, apply
Work, temperature, external load are equal to reason, and during operating in work progress or after building up, crack often occurs in body structure surface Jing.Have
A little cracks do not affect structure safety, only long-term to structure durability to have certain adverse effect；Some cracks but directly affect
Structure safety, is one of whether safe important symbol of structure.For this reason, it may be necessary to carry out in time to body structure surface crack progressing situation
Identification, monitoring, if fracture length and width sustainable development, be necessary to take reinforcing or other measures, to reduce because of structure
Damage or collapse the property loss for causing and personal safety threat.The identification of fracture length change easily and simply, can be adopted
With labelling, sign or direct repeatedly measurement fracture length data, the length change situation in crack is accurately determined by comparing；
Though some fracture length changes are not substantially, the minimum change of fracture width is unsatisfactory for using predictive of structural-load-carrying capacity and wants
Ask or dangerous.
However, as structural cracks width is less, (the minimum recognizable width 0.04mm in general crack, maximum crack width can
Up to 60mm), its fracture width change is also less, and the change of general structure fracture width increases with load or time change is linear
Or during non-linear acceleration cracking, that is, think that works occur than more serious disease or defect, it is unsuitable for continuing to carry making a reservation for
Function, or need to promptly reinforce disposal.Existing fracture width change identification common method has image amplifying method, pastes fragile material
Method, stickup strain gauge method etc..Wherein, image amplifying method is to adopt magnifying video image, judges fracture width according to benchmark scale,
Repeatedly observation fracture width simultaneously asks which poor, determines fracture width variable quantity, but edge of crack is obscured after image amplifies, reading have compared with
Big error, and repeatedly observation is difficult to ensure that the same position that can be directed at crack, the crack width tried to achieve after causing repeatedly observation
Degree variation error is larger.Fragile material, such as paraffin paper, thin glass etc. is pasted in fracture faces, fracture width change increases to certain
After degree, fragile material can be torn or come off, and represent that fracture width has certain change, but it cannot be realized quantitatively, also with regard to nothing
Method accurately judges fracture width variable quantity.It is, in vertically across crack stickup foil gauge, to test strain variation feelings to paste strain gauge method
Condition, when fracture width is unchanged, foil gauge is produced without strain, and foil gauge represents that fracture width is also changed when changing generation,
With paste fragile material method it is similar, the method can only identify whether fracture width changes, but cannot fracture change width enter
Row is quantitative..
Utility model content
It is accurate, with low cost based on strain sensing that the technical problems to be solved in the utility model is to provide a kind of measurement
Fracture width changes dynamic monitor, with the change realized dynamic, recognize fracture width exactly, is widely portable to big
The identification and monitoring of the fracture widths such as dam, building construction, bridge structure change.
For solving above-mentioned technical problem, this utility model is employed the following technical solutions：
Based on the fracture width change dynamic monitor of strain sensing, mainly by base support, induction rod, transmission spring
Constitute with strain sensor；The center distance of 2 base supports is L, and the top perforate of one of base support simultaneously interts
One induction rod, fixes induction rod one end, top and the transmission spring one end of another base support in perforate both sides using nut
Connection, the other end of induction rod are connected with the transmission spring other end；Strain sensor, strain sensor is adhered on induction rod
It is connected with strain acquirement cabinet, the sensing bar part of strain sensor and adhesion strain sensor is anti-by protective material parcel
Shield.
It is the material of 2 base supports, equivalently-sized.
Strain sensor is steel chord type, resistance-strain chip or raster pattern.
The area of section of induction rod is not less than 30mm2, the radius ratio of the circle of length and section equivalent area is not less than 9, material
Between 40GPa～210GPa, the rigidity for transmitting spring is more than 2000N/mm to material elastic modelling quantity.
The problems such as existing fracture width change test accuracy deficiency, inventor establishes a kind of based on strain sensing
Fracture width change dynamic monitoring method, the method carries out the company of certain construction using the transmission spring and induction rod of certain rigidity
Combination is connect, the strain variation value on induction rod is tested using strain sensor, calculated by mechanics and materialogy principle and split
The changing value of seam width, so that realize the dynamic monitoring of fracture width change.Accordingly, inventor has also designed and produced corresponding monitoring
Device.Using the monitoring method and device, with reference to the inventor Jing mechanics of materials and structural mechanics method derive based on spring
The high accuracy fracture width change solution formula of rigidity, the physical characteristics of induction rod, it is possible to achieve the change of fracture width is moved
State is recognized and is monitored, reduces the labor intensity and testing cost of people, be widely portable to dam, building construction, bridge structure etc.
The identification and monitoring of fracture width change.Compared with prior art, outstanding advantage of the present utility model is：
(1) know-why is different from additive method, is converted into spring internal force by the change of fracture width, is transferred to sensing
Bar, determines the variable quantity of fracture width, physics by straining the derivation of identification induction rod internal force, the Jing mechanics of materials and structural mechanics
Amount transmission is simple, clear and definite；
(2) test device instrument is simple, with low cost, it is easy to repair and replacement.
(3) fracture width change accuracy of identification is high, for the change accuracy of identification of fracture width is up to 0.001mm；
Description of the drawings
Use state figure that Fig. 1 is this utility model based on the fracture width change dynamic monitoring method of strain sensing and its
The structural representation (perpendicular to induction rod and transmission spring) of monitoring device.
Fig. 2 is fracture width change dynamic monitoring method and the mechanics principle of device of this utility model based on strain sensing
Schematic diagram.
In figure：1 body structure surface, 2 cracks, 3 base supports, 4 induction rods, 5 resistance strain plates, 6 transmission springs, 7 nuts.
Specific embodiment
Fracture width change dynamic monitoring method and the ultimate principle of device of this utility model based on strain sensing
1. operating procedure
As depicted in figs. 1 and 2, in the body structure surface (such as body structure surface 1) of crack both sides, 2 direction of vertical fracture is bored respectively
Hole bar planting or welding center distance are 2 materials of L, equivalently-sized base support 3；One end of induction rod 4 is penetrated wherein
The top perforate of one base support, the other end of induction rod be connecteds with 6 one end of transmission spring, transmit the spring other end with it is another
Base support top is connected；Adhesion resistance formula foil gauge 5 (or other strain detection testing devices, such as string wire frequency on induction rod
Method or fibre grating method), and the sensing bar portion of preventative resistance formula foil gauge and Adhesion resistance formula foil gauge is wrapped up with protective material
Point；Resistance strain plate is connected with strain acquirement cabinet, and will be sensed in the both sides of base support top perforate using nut 7
Bar is tightened, and makes the abundant stress of transmission spring, induction rod and base support；The actual measurement strain of induction rod is read in variable interval or timing(i.e. indicating value strain)；By formulaCalculate the changing value for obtaining fracture width；Wherein, the length of induction rod
Degree, elasticity modulus of materials, area of section are respectively lg, A and E, transmit spring rigidity be k.
2. the derivation of equation
As shown in Fig. 2 the length of induction rod, elasticity modulus of materials, area of section are divided into lg, A and E, transmit spring it is firm
Spend for k, in the presence of power F, the Zhongchang amount respectively Δ l of transmission spring and induction rodc、Δlg, by transmission spring and induction rod
Axial force it is equal, formula (1) can be obtained：
Formula (2) is obtained after formula (1) abbreviation：
Total Zhongchang amount of order transmission spring and induction rod is Δ L, and total Zhongchang amount Δ L is the variable quantity of fracture width, then
There is formula (3)：
Δ L=Δ lc+Δlg (3)
Formula (2) obtains formula (4) after bringing formula (3) into：
OrderAnd bring formula (4) into,Indicating value for induction rod is strained, and obtains formula (5) after abbreviation：
Now, makeFormula (6) can be obtained：
χ is the characteristic coefficient related to induction rod and transmission spring area of section, length and elastic modelling quantity.Knot in formula (6)
The strain of structureFor a certain value, when known induction rod area of section, length and elastic modelling quantity and and during transmission spring rate, you can
Try to achieve the width variation in crack.
When the material maximum linear strain of induction rod is εe, then the fracture width maximum variable quantity that can be recognized, the amount of being
Cheng WeiThe fracture width minimum change that the method can be recognized is
3. application example
Using preceding method and device, wherein, the length of induction rod, elasticity modulus of materials, area of section are respectively lg=
40mm, A=30mm2And E=90GPa, the rigidity for transmitting spring is k=2000N/mm, and the maximum linear strain of sensing bar material is εe
=1000, then try to achieve the fracture width variable quantity monitoring method precision be 0.000167mm, fracture width variable quantity test
Range is 1.66mm.
Claims (4)
1. a kind of fracture width based on strain sensing changes dynamic monitor, it is characterised in that main by base support, sense
Answer bar, transmission spring and strain sensor composition；The center distance of 2 base supports be L, the top of one of base support
End perforate an interspersed induction rod, fix induction rod one end in perforate both sides using nut, the top of another base support and
Transmission spring one end connection, the other end of induction rod are connected with the transmission spring other end；Strain sensor is adhered on induction rod,
Strain sensor is connected with strain acquirement cabinet, and the sensing bar part of strain sensor and adhesion strain sensor is by preventing
Protective material parcel protection.
2. the fracture width based on strain sensing according to claim 1 changes dynamic monitor, it is characterised in that：Institute
State the material of 2 base supports, equivalently-sized.
3. the fracture width based on strain sensing according to claim 1 changes dynamic monitor, it is characterised in that：Institute
Strain sensor is stated for steel chord type, resistance-strain chip or raster pattern.
4. the fracture width based on strain sensing according to claim 1 changes dynamic monitor, it is characterised in that：Institute
The area of section for stating induction rod is not less than 30mm2, the radius ratio of the circle of length and section equivalent area is not less than 9, elastic properties of materials
Between 40GPa～210GPa, the rigidity of the transmission spring is more than 2000N/mm to modulus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621024277.9U CN206037977U (en) | 2016-08-31 | 2016-08-31 | Fracture width changes dynamic monitoring device based on response of meeting an emergency |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621024277.9U CN206037977U (en) | 2016-08-31 | 2016-08-31 | Fracture width changes dynamic monitoring device based on response of meeting an emergency |
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| CN206037977U true CN206037977U (en) | 2017-03-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106197342A (en) * | 2016-08-31 | 2016-12-07 | 广西交通科学研究院 | Fracture width change dynamic monitor based on strain sensing |
| CN107884513A (en) * | 2017-10-29 | 2018-04-06 | 宋金博 | A kind of Bridge Crack identification device and its application method based on strain sensing |
-
2016
- 2016-08-31 CN CN201621024277.9U patent/CN206037977U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106197342A (en) * | 2016-08-31 | 2016-12-07 | 广西交通科学研究院 | Fracture width change dynamic monitor based on strain sensing |
| CN107884513A (en) * | 2017-10-29 | 2018-04-06 | 宋金博 | A kind of Bridge Crack identification device and its application method based on strain sensing |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yu Mengsheng Inventor after: Hao Tianzhi Inventor before: Yang Tao Inventor before: Wang Zanzhi Inventor before: Tong Weiguang Inventor before: Yu Shilong Inventor before: Chang Chengzhang Inventor before: Liu Hongbo Inventor before: Lu Yi Inventor before: Lian Jinming Inventor before: Hao Tianzhi |
|
| CB03 | Change of inventor or designer information |