wsn in prague metro - civil engineering · wsn in prague metro bologna 20 - 21 february 2008 martin...
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WSN in Prague metro
Martin Vaníček - CTU
WSN in Prague Metro Bologna 20 - 21 February 2008 Martin Vaníček
WSN installation in Prague - past
• Test site Near Dejvická metro station (~70m)
• 8 wireless nodes + Stargate gateway installed• 5 nodes + Stargate in one ring• 3 nodes along tunnel ~ 17m distance• Linksys GPRS router for internet access next to Stargate
• Last issues• Linksys router updated with new firmware to accept SMS for
connect status and reconnect to solve problems with connection dropping
• Stargate stopped working, the WSN removed during January visit (also by Cambridge team) – yesterday we found that power supply is faulty and not Stargate itself
WSN in Prague Metro Bologna 20 - 21 February 2008 Martin Vaníček
WSN installation in Prague - future
• Proposal:• WSN – will be installed in more locations (Nádraží Holešovice-
Vltavská, I.P.Pavlova-Vyšehrad & Staroměstská-Můstek ?), where real measurements will be done, in a setup proposed from test location
• WSN will be connected to real devices for monitoring –inclinometers (developed in Cambridge) and Geokoncrackmeters in order to start collecting measured data
• Internet – Linksys / Stargate will be installed closer to the station (not more then 50m)
• The real installation will be done after testing period at the lab, where all necessary implementations for periodic data transfer from tunnel and process for remote management restart will be done
WSN in Prague Metro Bologna 20 - 21 February 2008 Martin Vaníček
WSN installation in Prague – future 2 (based on yesterday‘s meeting)
• Proposal:• WSN – setup by Cambridge (Balloon gateway with X-mesh
wireless data collection and communication protocol) will be installed on 1 real location in Prague
• WSN using Crossbow‘s implementation (Stargate Netbridgegateway with X-mesh protocol) will be installed on other real location (s) in Prague Metro
• Close co-operation between Cambridge and Prague teams on the X-mesh protocol implementation to be compatible and therefore comparable
• Unless required, the old system using Stargate and Surge protocol will not be installed in Prague, as the system become recently obsolete
Thank you
for your attention
Prague Metro MonitoringSection in km 18,725
Bologna Meeting – 02/2008Jan Záleský
Placement of tilt plates and convergence bolts
Initial inclination of tilt plates
• Axe of 2.1 - 2.4 to horizontal plane
• 2.05 plate to horizontal plane
Yellow points –convergence bolts25,4°
C 04,4°L 00,6°
09,8°
47,6°51,7°
Test area
All results of tilt measurement
-1,50
-1,00
-0,50
0,00
0,50
1,00
1.12.2006 1.2.2007 1.4.2007 1.6.2007 1.8.2007 1.10.2007 1.12.2007 1.2.2008
-30,0
-25,0
-20,0
-15,0
-10,0
-5,0
0,0
5,0
10,0
15,0
20,0
2.01 [mm/m] 2.02 [mm/m] 2.03 [mm/m] 2.04 [mm/m]2.05_C [mm/m] 2.05_L [mm/m] Temp. in deg.C
Left / Right of the Rail
-1,00
-0,80
-0,60
-0,40
-0,20
0,00
0,20
0,40
1.12.2006 1.2.2007 1.4.2007 1.6.2007 1.8.2007 1.10.2007 1.12.2007 1.2.2008
-30,0
-25,0
-20,0
-15,0
-10,0
-5,0
0,0
5,0
10,0
15,0
20,0
2.01 [mm/m] 2.04 [mm/m] Temp. in deg.C
Left / Right of the Tunnel Crown
-0,80
-0,60
-0,40
-0,20
0,00
0,20
0,40
0,60
0,80
1,00
1.12.2006 1.2.2007 1.4.2007 1.6.2007 1.8.2007 1.10.2007 1.12.2007 1.2.2008
-30,0
-25,0
-20,0
-15,0
-10,0
-5,0
0,0
5,0
10,0
15,0
20,0
2.02 [mm/m] 2.03 [mm/m] Temp. in deg.C
Plate at Bottom of the Tunnel
-1,50
-1,00
-0,50
0,00
0,50
1,00
1.12.2006 1.2.2007 1.4.2007 1.6.2007 1.8.2007 1.10.2007 1.12.2007 1.2.2008
-30,0
-25,0
-20,0
-15,0
-10,0
-5,0
0,0
5,0
10,0
15,0
20,0
2.05_C [mm/m] 2.05_L [mm/m] Temp. in deg.C
Convergence monitoring
Started:• “Z” reading
17/01/08 • 1st reading
08/02/08
No signifacantchanges
RESEARCH ONUNDERGROUND STRUCTURES AGEING
WITH EXPLOITATION OF MONITORINGAND MICROMEASUREMENT SYSTEMS -
AUXILIARY METHODS II
Proposer: Prof. Ing. Ivan Vanicek, DrSc.Author of the report: RNDr. Jaromir Machacek, Ph.D.
Czech Technical University in Prague
Grant Agency of Czech Republic, Reg. Nr. 103/06/1257:
Research of underground structures ageing with exploitation of monitoring and micro-measurement systems
AUXILIARY METHODS II - GA CR Reg. Nr. 103/06/1257:
a) monitoring of time-development of selected lining parts dyna-mic behaviour changes under traffic loads (at monitoring profile on line C, rail Nr.2, kilometer spacing 18,725 of the Prague metro, near the Holesovice Station) - systematically performed,
b) recording and processing of dynamic response accelerograms of reinforced concrete slab during the laboratory fatigue test (finished, data in processing),
c) monitoring of fatigue failure time-development by means of examination of elastic waves spreading parameters (up to now not started because of procceding instalations, it will start next month).
a) MONITORING OF TIME-DEVELOPMENT
CHANGES OF SELECTED LINING PARTS DYNAMIC
BEHAVIOUR UNDER TRAFFIC LOADS
at monitoring profile on line C, rail Nr.2, kilometer
spacing 18,725 of the Prague metro, near the
Holesovice Station.
LEVEL DISTRIBUTION GRAPHS OF NORMED DEFLECTION VALUES
in channel A - (defective part) in channel B - (intact part)
(values in channel A - values in channel B)
DATA ANALYSIS / TIME DOMAIN / DESCRIPTIVE STATISTICS
Y = nu
mber o
f day
s sinc
e 1.1.20
07
X = normed deflection (100*j)
Z =
val
ue fr
eque
ncy
(n)
Time development of level distribution of normed deflections in channel A
with coloured differences (A-B)
number of days since 1.1.2007normed deflection (j)
num
ber
of v
alue
s (n)
DATA ANALYSIS / TIME DOMAIN / DESCRIPTIVE STATISTICS
Freq
uenc
y di
strib
utio
n of
def
lect
ions
in c
hann
el B
Frequency distribution of deflections in channel A
Col
o ur i
n g r
efl e
c ts t
he n
u mbe
r o f
day
s si
nce
1.1.
2 00 7
DATA ANALYSIS/ TIME DOMAIN / DESCRIPTIVE STATISTICSTime development of level distribution
of normed deflections in channel A and Bwith coloured measuring stage
A ~ B in level distribution
0
50
100
150
200
250
300
350
400
450
500
0 50 100 150 200 250 300 350 400 450 500
number of values of deflection in channel A
num
ber o
f val
ues
of d
efle
ctio
n in
cha
nnel
BDATA ANALYSIS / TIME DOMAIN / DESCRIPTIVE STATISTICS
A ~ (A-B) in level distribution
0
100
200
300
400
500
600
0 50 100 150 200 250 300 350 400 450 500
number of values of deflection in channel A
num
ber o
f val
ues
(A-B
)DATA ANALYSIS / TIME DOMAIN / DESCRIPTIVE STATISTICS
0,00
0,05
0,10
0,15
0,20
0,25
0,30
0 20 40 60 80 100 120
frequency (Hz)
Am
pl.-P
eak
(j)
FFT(A) FFT(B)
FFT of channel A and B normed deflections time sectionDATA ANALYSIS FREQUENCY DOMAIN
DATA ANALYSIS FREQUENCY DOMAIN
num
ber o
f day
s sin
ce1.
1.20
07
num
ber o
f day
s sin
ce1.
1.20
07
Time development of normed deflections FFT in channel A and B
frequency (Hz) frequency (Hz)
Geophone A (defective part)
Geophone B (intact part)
DATA ANALYSIS FREQUENCY DOMAIN
numbe
r of d
ays s
ince 1.1
.2007
Time development of differential FFT amplitudes - FFT of (A - B) isochronal deflections
frequency (Hz)
DATA ANALYSIS FREQUENCY DOMAIN
number of days since 1.1.2007
frequency (Hz)
Time development of differential FFT amplitudes - FFT of (A - B) isochronal deflections
(detail for 5 - 25 Hz frequency band)
DATA ANALYSIS FREQUENCY DOMAIN
number of
days s
ince1.1
.2007
Time development of FFT amplitude differences {(FFT in channel A) - (FFT in channel B)}
frequency (Hz)
DATA ANALYSIS FREQUENCY DOMAIN
norm
ed am
plitud
es of
FFT
in ch
anne
l A
(defe
ctive
part)normed amplitudes of FFT in channel B
(intact part)
Z = differences of normed amplitudes (A - B)
DATA ANALYSIS FREQUENCY DOMAIN
norm
ed am
plitu
des o
f FFT
in ch
anne
l A
(defe
ctive
part)
normed amplitudes of FFT in channel B
(intact part)
Z = differences of {FFT(A) - FFT(B)}
INTEGRAL OF NORMED DEFLECTION TIME SECTION FFT (frequency band 5 - 25 Hz]
-2
0
2
4
6
8
10
12
14
40 90 140 190 240 290 340 390
count of days from 1. 1. 2007 to 17.1.2008
I(FFT
)
I(A) I(B) IFFT(A-B) I(FFTA-FFTB) temperature in tunnel (°C/2)Fe
b 20
07
Mar
200
7
Apr
200
7
May
200
7
Jun
2 007
Jul 2
007
Aug
200
7
Sep
2007
Oct
200
7
Nov
200
7
Dec
200
7
Jan
2008
INTEGRAL OF NORMED DEFLECTION TIME SECTION FFT (frequency band 5 - 25 Hz]
6,0
6,5
7,0
7,5
8,0
8,5
40 90 140 190 240 290 340 390
count of days from 1. 1. 2007 to 17.1.2008
I(FFT
)I(A) I(B) IFFT(A-B)
Feb
2007
Mar
200
7
Apr
200
7
May
200
7
Jun
2 007
Jul 2
007
Aug
200
7
Sep
2007
Oct
200
7
Nov
200
7
Dec
200
7
Jan
2008
b) DYNAMIC RESPONSE OF THE REINFORCED CONCRETE SLAB ON
LABORATORY FATIGUE TEST
The tested slab in the fatigue test bench.
PHASE RELATIONS
velocity
accelerograms
deflections
harmonic
PHASE RELATIONS - LOADING AREA
PHASE RELATIONS - RELAXATION AREA
accelerograms
velocity
deflections
harmonic
c) MONITORING OF FATIGUE FAILURE
TIME-DEVELOPMENT BY MEANS OF
EXAMINATION OF ELASTIC WAVES
SPREADING PARAMETERS
- measuring will start after finishing all
intended instalations in the acoustic sampling
field.
Metro Prague
Svatoslav Chamra
Measuring standpoints
km 19,435 – km 19,480
Line AMůstek ‐ Staroměstská
Section fit for instrumentation ‐somewhere between km 19,435 – 19,480– compressed concrete lining by soviet mechanized tunnelling shield TSCB‐3
Prague fault ‐ about km 19,450, cca 20 m width
tectonic deformationof clay shales –zahoranske &bohdalecke &dobrotivske layers
boundary‐line aboutkm 19,463
Geological conditions
Various types of cracks
April 2003
October 2007
April 2003 October 2007
Degradation of compressed concrete tunnel lining by aggressive water
Thank you for your attention.
Nuselský bridge
Facts• one of the biggest in the CR• built 1965 – 1973• 6 lane road, twin track metro,
walkway• 485m long, 26,5m wide,
42,5m high• pre-stressed reinforced
concrete frame on 4 pillars• 1997 – repair of the steel grid
due to fatigue cracks
Metro line C
42,5
m
Proposed instrumentation
• Tilt plates• VW crackmeters• Tape extensometer• Geophysical methods
Installation in London UndergroundPeter Bennett
• Background– Spalling in deep tunnel– Fresh and historical
Damaged area• Covers over 130m• 54 joints identified
– Currently monitoring some with VWSG
• Caused by joint movement
• Possibly tension cracks on wall?
VWSG Monitoring
Proposal• Install• 16 tiltmeters
– B,F,H,M, 1640,1661,1689,1714
• 5 crackmeters– Joint F-G,
1640,1661,1689,1714– Crack in segment K at 1640
• 2 relays / environmental monitors– L, 1675 and 1607
• 1 gateway– B, 1685
• Anemometer and accelerometers– Into data logger– 24hrs monitoring in each of
three locations
Gateway
• Ethernet gateway in tunnel• GPRS connection at top of shaft• Remotely powered gateway and repeater
hubs