Transcript NJ23 Wayne Bridge Test - Part 2,

Stick Scanner
Procedures
Insert stick scanner to a drilled
hole and turn adjuster to scan
image
Image example
Stick Scanner
Wayne
Stick Scanner
Image Processing
Image
synthesis
If the depth of hole is deeper than the length of sensor:
Surface
②
Overlapping
intersection
①
Binarization
Extract course aggregate
to determine the degree of segrega
Surface
Surface
Stick Scanner
Diagnostic Procedures
φ24.5mm
φ14.5mm
① check bar
location
② preliminary drilling
⑥ Scanning
⑤ drying
④ Ultra
cleaner
③ Diamond bit
⑦ Repair
Guide tip
Diamond core bit
Drilling
sonic
Application (1)
RC HW bridges diagnostic
Retrofitted mortar depth verification
Web’s additional thickness
Web’s lower additional thickness
Existing concrete
Polymer cement
Mortar layer①
Surface
Polymer cement
Mortar layer②
4.3mm
・Verify the thickness of each mortar layer
・Verify laminated layer condition
・Verify carbonation depth
・Evaluate crack distribution, crack width
Application （２）
Bridge Pier Diagnostic
Alkali Silica Reaction
・Crack depth, crack width
・Carbonation depth (phenolphthalein)
・to predict crack occurrence （ASR）
Application（３）
HW bridge’s pier diagnostic
Earthquake resistance retrofitted pier
・Crack depth, crack width
・Carbonation depth
・Crack occurrence prediction（transient
temp/shrinkage）
Application（4）
Drainage pumping station
ASR diagnostic
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
◎ The developed Line Scanner Sensing Device is
practical for bridge monitoring application
10
Telecentric (deflection)
◎
Beam web
11
Telecentric (strain)
◎
◎
12
Telecentric (strain)
Stencil
guide
◎
◎
base
box
13
Telecentric
Web
deflection
stethoscope
◎
Lower
flange
strain
microphone
Telecentric
(deflection)
14
Telecentric (deflection)
◎
◎
Compared to laser measurement: +/- 3mm
mm
15
Telecentric (strain)
◎
microstrains
Compared
to strain gauge :
◎
+/- 60 microstrains
16
Easily cleaned up with no
markings
Magnetic studs
◎
◎ Easily pried off
with hand tool
17
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
◎ They are practicable for bridge monitoring
applications
18
Application to a bridge at Osaka
Japan
Features
:
Easy to set scanning direction
Not influenced by external brightness
4800dpi
19
19
Application of Line Scanner Sensor in
evaluating concrete actual stress
Stress released method
拡大
の分布荷重
A
Specimen（PC T-beam)
穴の 半径=10
B
20
Procedure
①
②
③
④
21
Scanned image examples
Horizontal
Vertical
To have a better sharpness
effect, Grey spray was used
45°diagonal
Resolution: 1200dpi
22