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Stick Scanner
Image example
Procedures
Insert stick scanner to a drilled hole and turn adjuster to scan image
Stick ScannerWayne
Stick Scanner
Image Processing
Overlapping intersection
Su
rfac
e
Su
rfac
e
Su
rfac
e
Image synthesis
Binarization
If the depth of hole is deeper than the length of sensor:
Extract course aggregate to determine the degree of segregation
①②
① check bar location
② preliminary drilling
φ14.5mm
③ Diamond bit
φ24.5mm
④ Ultra sonic cleaner
⑤ drying
⑥ Scanning ⑦ Repair
Diagnostic Procedures
Stick Scanner
Diamond core bit
Guide tip
Drilling
Application (1)RC HW bridges diagnostic
4.3mm
Retrofitted mortar depth verification
Existing concrete
Polymer cementMortar layer①Polymer cementMortar layer②
Web’s additional thickness Web’s lower additional thickness
Surface
・ Verify the thickness of each mortar layer・ Verify laminated layer condition・ Verify carbonation depth・ Evaluate crack distribution, crack width
Bridge Pier Diagnostic
Alkali Silica Reaction
Application (2)
・ Crack depth, crack width・ Carbonation depth (phenolphthalein)・ to predict crack occurrence ( ASR )
HW bridge’s pier diagnostic
Earthquake resistance retrofitted pier
Application (3)
・ Crack depth, crack width・ Carbonation depth・ Crack occurrence prediction ( transient temp/shrinkage )
Drainage pumping station
ASR diagnostic
Application ( 4 )
Recommendation
Increasing number of over-serviceability structures
Demand in structural deterioration diagnoses
Documentation and data base
High precision test and long term monitoring archive provide efficient
maintenance strategy
Telecentric (deflection)
The repeatability and the accuracy of the Line Scanner Sensing were confirmed
It is applicable to several types of constructional material such as wood, steel and concrete
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10
The developed Line Scanner Sensing Device is practical for bridge monitoring application
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Telecentric (deflection)
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11
Beam web
Telecentric (strain)
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12
◎
Telecentric (strain)
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13
◎
Stencil guide
base
box
Telecentric
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14
Lower flange strain
microphone
stethoscope
Web deflection
Telecentric (deflection)
Telecentric (deflection)
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15
◎
mmCompared to laser measurement: +/- 3mm
Telecentric (strain)
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16
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microstrains
Compared to strain gauge : +/- 60 microstrains
Easily cleaned up with no markings
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17
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Magnetic studs
Easily pried off with hand tool
Concluding remarks
The repeatability and the accuracy of the full field optical monitoring devices were verified
They are applicable to several types of constructional material such as wood, steel and concrete
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18
They are practicable for bridge monitoring applications
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19
Application to a bridge at Osaka Japan
Not influenced by external brightnessEasy to set scanning direction
4800dpi 19
Features:
20
Application of Line Scanner Sensor in evaluating concrete actual stress
Stress released method変化分 拡大
X
Y
Z
8.7.
6.5.
4.3.
2.1.
0.-1.
-2.
-3.-4.
-5.-6.
-7.
-8.
-9.-10.
-11.-12.
-13.
-14.-15.
-16.
V1L1C2G2
Output Set: LINEAR COMBINATIONContour: Plate Top Minor Stress
1 : L I N E A R C O M B I N A T IO N , P l a t e T o p Y N o r m a l S t r e s s
- 1 5 .
- 1 4 .
- 1 3 .
- 1 2 .
- 1 1 .
- 1 0 .
- 9 .
- 8 .
- 7 .
- 6 .
- 5 .
- 4 .
- 3 .
- 2 .
- 1 .
0 .
1 .
- 1 0 0 . - 9 0 . - 8 0 . - 7 0 . - 6 0 . - 5 0 . - 4 0 . - 3 0 . - 2 0 . - 1 0 . 0 .
X C o o r d i n a t e S y s t e m 0
縦方向
=10穴の半径
1 : L IN E A R C O M B I N A T IO N , P l a t e T o p M i n o r S t r e s s
- 1 .
0 .
1 .
2 .
3 .
4 .
5 .
6 .
7 .
8 .
- 1 0 0 . - 9 0 . - 8 0 . - 7 0 . - 6 0 . - 5 0 . - 4 0 . - 3 0 . - 2 0 . - 1 0 . 0 .
Y C o o r d in a t e S y s te m 0
=100幅の半分
A
B
A B
8N/ mm2分の分布荷重
X
Y
Z
8.
7.
6.5.
4.3.
2.
1.0.
-1.-2.
-3.-4.
-5.-6.
-7.
-8.-9.
-10.-11.
-12.
-13.
-14.-15.
-16.
V1L1C2G2
Output Set: LINEAR COMBINATIONContour: P late Top Minor Stress
Specimen ( PC T-beam)
21
Procedure
① ②
③ ④
22
Scanned image examples
Resolution: 1200dpiTo have a better sharpness effect, Grey spray was used
Horizontal 45°diagonalVertical