Instrumentation and Monitoring applications. Los Angeles County Metropolitan Transportation Authority 28 th of March

Transcription

1 Instrumentation and Monitoring applications for urban projects Los Angeles County Metropolitan Transportation Authority 28 th of March 2012

2 ANTES DE EMPEZAR * * Chairman of the UK Construction Industry Training Board 2

3 Table of contents Overview and Experience Instrumentation and Monitoring for Cut & Cover and U-Wall excavation Instrumentation and Monitoring for Bored Tunneling Instrumentation and Monitoring for Building and Structure Protection Real-Time Data Management VS Manual readings including Cost Analysis Monitoring under Owner or Design Builder?

4 OVERVIEW & EXPERIENCE

5 Who are we? World leader in real time instrumentation and monitoring for construction Soldata group: 10 geographical subsidiaries (United Kingdom, USA, France, China, Spain, Netherlands, Hungary, Serbia, Ukraine, Russia). $50 million yearly turn over. More than 300 employees, mainly engineers, of different nationalities

6 Toulon Tunnel 60 M$ monitoring 12 M$ monitoring 55 M$ monitoring M t off Barcelona B l Metro L9 35 M$ monitoring Metro of Amsterdam Metro of London KX 15 M$ monitoring Metro of Budapest M4 Metro of Bucarest Metro of Toulouse Metro of Copenhaguen Metro of Madrid Metro of Lisboa Metro of Paris Metro of Porto Soldata references in Europe (tunnel construction) Metro of Lille

7 I&M FOR URBAN EXCAVATION

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9 Instrumentation and Monitoring for Large Urban Excavation Standard Instrumentation (Inclinometers Strain Gages Load Cells - Piezometers) bl ( l ) AMTS Capabilities (Cyclops) Case Studies

10 SOE Horizontal deflection Inclinometers Automatic D-wall movements, slope stability monitoring Manual (In place)

11 Supporting Elements Performance Monitoring Tie Backs Struts Load Cells Strain Gages

12 Water Monitoring water level or pore-pressure Dewatering

13 AMTS - CYCLOPS

14 Urban Excavation Monitoring Case Study I City Creek (SLC )

15 2 CYCLOPS 3D monitoring of SOE and Urban Excavation: City Creek adjacent structures 8 Manual Inclinometers for back up measurements when movements detected

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17 Urban Excavation Monitoring Case Study II KCRC - HK 9 AMTS 24/7 3D monitoring of SOE railtracks Manual Survey back up

18 Manual Inclinometers / piezos / strain gages 11 AMTS monitoring adjacent d structures Urban Excavation Monitoring Case Study II KCRC - HK

19 I&M FOR BORED TUNNEL

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21 Instrumentation and Monitoring for Tunneling Standard Geotechnical Instrumentation (Extensometers Piezometers) bl ( ) AMTS Capabilities (Centaur) Inside Tunnel Monitoring Case Studies

22 Ground movements around the Tunnel Extensometers vertical ground movements Tunneling, mining, grouting Manual Automatic (In place)

23 The Centaur System Surface settlement measurement on difficult access site and real time: highways Congested urban areas

24 Real Time Settlements Contours The Centaur System

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26 Monitoring inside Tunnel: Instruments within lining elements Strain gages Pressure Cell Strain gages Pressure cell

27 Monitoring inside Tunnel: Convergence with tiltmeter arrays

28 or AMTS if possible (line of sight?)

29 Tunnel Monitoring Case Study I Alaskan Way Viaduct Surface Settlement Points (CENTAUR) (50 spacing along tunnel alignment) + Intersections 350 total Extensometer locations ( spacing along tunnel alignment) 123 total

30 Tunnel Monitoring Case Study II Toulon South Tunnel automatic Piezometers Global water level Profile Extensometers t inside id tunnel (MPBX) vertical ground movements Inside tunnel and convergence Strain Gages Strain in tunnel supports Wielded to H beam Load cells Pressure load cells

31 Tunnel Monitoring Case Study II Toulon South Tunnel 1800 virtual monitoring points for settlement monitoring 5 points array sections every 30 or 15 in sensitive areas 1 to 8 measures per day Required accuracy up to +/-0.5mm

32 I&M FOR BUILDING PROTECTION

33 Instrumentation and Monitoring for Building and Structure Protection Standard Structural Instrumentation (Tiltmeters Liquid Levels Crackmeters) AMTS Capabilities (Centaur and Cyclops) Satellite interferometry Case Studies (Sagrada Familia Schulich Business School Virginia State Capitol Amsterdam Subway)

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35 Tiltmeters Biaxial Tilt of existing structures On key structural vertical elements on sensitive structures

36 Liquid Level systems Settlement monitoring highly accurate real time settlement monitoring on key structural elements

37 Crack Gages Joint/crack monitoring Real time monitoring of existing damages to structures

38 Combination of Cyclops/Centaur for Building Protection

39 Combination of Cyclops/Centaur for Building Protection 1

40 Large Scale Building Protection with Satellite interferometry A radar satellite captures an image of the Earth surface by emitting a radar wave and recording the reflected echoes. Radar image. An amplitude : reflectivity. A phase : wave travel time

41 The InSAR technique is the phase difference between 2 SAR images generated on the same area at different moments. Large Scale Building Protection with Satellite i t f interferometry t

42 42 Bucarest Metro Barcelona Metro Linea 9 Toulon A54 motorway tunnel Amsterdam NZLijn Metro tunnel Latest Technique in Instrumentation and Monitoring

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44 QUESTIONS?

45 REAL TIME DATA MANAGEMENT VS MANUAL MONITORING

46 Real Time Data Management VS Manual Readings Technical Comparison Specifications Analysis on recent Large Tunneling projects Global Cost and Risk Analysis

47 Technical comparison Accuracy and precision Manual crackmeter: 1mm accuracy + human factor automatic crackmeter: 0.1%FS = 0.1mm

48 Technical comparison Data acquisition Manual inclinometer (60 ) 1 reading = 2 hours In place inclinometer (60 ) > 60 readings / hour 24/24 7/7

49 Technical comparison Safety on jobsite Difficult or dangerous site access (urban areas / highway /underground)

50 Financial comparison and Financial risk Management Survey specifications: 1 daily reading during excavation / anchors / fill (6 months). If notification level is reached increase to twice daily 7/7 If alert level is reached increase to hourly + stop works Manual survey point on structure or road Excavation perimeter to survey with optical targets Total number of points = 48

51 Financial comparison Cost comparison (5 days/week - normal) Cost comparison C t A t ti Manual Daily cost Automatic (7/24) 800$ 250$ x 2 (2 men crew) $ Total cost $ $

52 Financial comparison if notification level during 1 month If alert level during one week Cost comparison Manual automatic normal $ $ Notification $ $ alert $??? $

53 Large Scale Risk Management and Control Number of Urban tunnels collapse since Collapse 1992 No real time 17 u / 31 monitoring tunnels 54 % Real time Monitoring 1 u / 24 tunnels 4% Study from AXA insurance company

54 Risk Management and Control Example: Total cost of tunnel project = 100M$ Urban tunnels Manual monitoring Real time Monitoring Instrume ntation Collapse probability Cost of collapse Cost x prob. cost prob. 1% (1M$) 2% (2M$) +100% 54 % 4 % 10M$ (10%) 5.4 M$ Total cost = 6.4M$ 10M$ = (10%) M$ 2.4M$ Initial «artificial» saving of 1M$ leads to a final loss difference of 4M$ (4 times more)

55 Why Automatic Real time monitoring?

56 THANKS FOR YOUR ATTENTION