Construction Management

Transcription

1 Construction Management For Tunnels Lee W. Abramson, P.E. Executive Vice President 10 th Annual Breakthroughs in Tunneling Short Course August 14-16, 2017 Chicago, Illinois

2 Agenda 1. History of CM 2. Why It Developed 3. What is CM 4. How is it Done 5. Issues Unique to Tunneling August 16, 2017 Mott MacDonald 2

3 Why Construction grow business Experience in climate in the change 60 s and adaptation 70 s in NASA? Increase in number and complexity of projects New/innovative/proprietary products and methods Unions Foreign competition Government regulations 1 2 Owner s eyes untrained Reality surprising Needs misinterpreted Awkward construction details Inappropriate equipment Inappropriate materials Budget overruns Schedule delays Quality and productivity declined Design fell short of expectations Contract disputes 3 4 Owners not receiving fair value!!! August 16, 2017 Mott MacDonald 3

4 Contract Requirements Detailed scope Specified quality Bid price On time August 16, 2017 Mott MacDonald 4

5 Contract Requirements Detailed scope Specified quality Bid price Schedule - On time Not Enough to Assure a Successful Project August 16, 2017 Mott MacDonald 5

6 The Owner s Dilemma Few owners maintain the staff resources necessary to pay continuing close attention to every detail. Yet, these details can make or break the project. August 16, 2017 Mott MacDonald 6

7 The Owner s Dilemma S/he wants High level of management Earnest competitive bidding S/he gets Low bid encourages Poor management Contractor in compromising position Can t skimp on materials Can skimp on management Construction management approach Owner specified level of management Isolates management from bid process Minimizes owner risk Best possible project outcome August 16, 2017 Mott MacDonald 7

8 Construction Management Emerged Started out including: Owner representation Value engineering Constructability reviews Cost estimating Scheduling Critical Path Administration August 16, 2017 Mott MacDonald 8

9 Typical CM Functions Constructability reviews Biddability reviews Bid evaluation Scheduling/estimating QA/QC (ISO) Community relations Management reports Submittal control Change management Progress payments Field inspection Claims avoidance/admin Surveying Photo documentation Office support Document control Systems testing Contract close-out August 16, 2017 Mott MacDonald 9

10 Typical CM Staffing August 16, 2017 Mott MacDonald 10

11 PROJECT DELIVERY AFFECTS CM S ROLE Design Bid Build Owner Designer Contractor CM Design Build Owner Contractor CM Designer Others Progressive DB DBOM CM/GC EPC 3P August 16, 2017 Mott MacDonald 11

12 PROJECT DELIVERY AFFECTS CM S ROLE Design Bid Build Owner Designer Contractor CM Why use DB? Less time? Less money? Better product? Design Build Owner Contractor CM Designer Others Progressive DB DBOM CM/GC EPC 3P August 16, 2017 Mott MacDonald 12

13 PROJECT DELIVERY AFFECTS CM S ROLE Design Bid Build Owner Designer Contractor CM Why not use DB? Owner may have less control? Urgent answers to ATCs? Does contractor really start at NTP? Design Build Owner Contractor CM Designer Others Progressive DB DBOM CM/GC EPC 3P August 16, 2017 Mott MacDonald 13

14 New Developments Affecting CM BIM Asset Management Life Cycle Costs August 16, 2017 Mott MacDonald 14

15 Tunnel Information Management System (TIMS) Virtual Real Time August 16, 2017 Mott MacDonald 15

16 Some Typical Reports: Any Way Any Time Any Where August 16, 2017 Mott MacDonald 16

17 Claims Avoidance/Administration Partnering All stakeholders Dispute Resolution (DRB s, arbitration, etc.) At the lowest possible level In the shortest amount of time Risk management Proactively August 16, 2017 Mott MacDonald 17

18 Claims Avoidance/Administration Partnering All stakeholders Dispute Resolution (DRB s, arbitration, etc.) At the lowest possible level In the shortest amount of time Risk management Proactively - Behind on Schedule/Over Budget? August 16, 2017 Mott MacDonald 18

19 Claims Avoidance/Administration Partnering All stakeholders Dispute Resolution (DRB s, arbitration, etc.) At the lowest possible level In the shortest amount of time Risk management Proactively - Behind on Schedule/Over Budget? - Take the Data and Rewrite history? August 16, 2017 Mott MacDonald 19

20 Risk Management Continuously through planning, design, construction, and commissioning Communicate risk management/mitigations to contractor Contractor may introduce new risks that are not mitigated Protect the Owner August 16, 2017 Mott MacDonald 20

21 Typical Issues (the details ) Ground Improvement Environmental Impacts Ground Conditions Excavation Methods Muck Handling Disposal CM Initial Support Shafts Portals Final Lining August 16, 2017 Mott MacDonald 21

22 Typical Issues Ground Conditions Soil Grain Size Grading Abrasivity Mixed Face Contacts Similarity Faults/Shears? Rock UCS RQD, Q, RMR Joints Drillability Boreability Water Flow/pressure Quality Collection/Disposal August 16, 2017 Mott MacDonald 22

23 Typical Issues Ground Conditions Soil Grain Size Grading Abrasivity Rock UCS RQD, Q, RMR Joints Drillability Boreability Mixed Face Contacts Similarity Faults/Shears? Water Flow/pressure Quality Collection/Disposal Differing Site Conditions Clause August 16, 2017 Mott MacDonald 23

24 Typical Issues Ground Conditions Soil Grain Size Grading Abrasivity Rock UCS RQD, Q, RMR Joints Drillability Boreability Mixed Face Contacts Similarity Faults/Shears? Water Flow/pressure Quality Collection/Disposal Differing Site Conditions Clause Geotechnical Baseline Report August 16, 2017 Mott MacDonald 24

25 Typical Issues MWD Inland Feeder Project August 16, 2017 Mott MacDonald 25

26 Typical Issues Excavation Methods By Hand (Soil) Stand-up time Stiffness/density Tools Digger Shields (Soil) Breasting Rib erection Junk segments TBMs/EPBs (Soil) Abrasion Annular grouting Soil plug in screw Face pressures Advance rates Drill & Blast (Rock) Powder factors Overbreak Perimeter control Roadheader (Rock) Horsepower Bit wear O&M TBMs (Rock) Penetration Cutter wear Grippers Initial support August 16, 2017 Mott MacDonald 26

27 Typical Issues King County Mercer Street Tunnel August 16, 2017 Mott MacDonald 27

28 Typical Issues Initial Support Steel Ribs Size Weight Spacing Blocking Liner Plate Filling annulus Junk Segments Quality Expansion Cracking Sacrificial? Rock Reinforcement Grouting Testing Proprietary products Shotcrete Nozzleman Early strength Thickness Testing PCC Segments Single pass August 16, 2017 Mott MacDonald 28

29 Typical Issues Atlanta West Area CSO Tunnel August 16, 2017 Mott MacDonald 29

30 Typical Issues Final Lining CIP Concrete Strength Voids Grouting Cold joints Leakage Waterproofing Embedments PCC Segments Ring build Cracking Alignment Grouting Gaskets Leakage Attachments Other Steel Plastic Mortar August 16, 2017 Mott MacDonald 30

31 Typical Issues SFPUC New Irvington Tunnel August 16, 2017 Mott MacDonald 31

32 Typical Issues SEM/NATM Sequential Excavation Method (SEM) Stages Advance lengths Pre-reinforcement Lattice girders Shotcrete Connection details Instrumentation Monitoring Communication August 16, 2017 Mott MacDonald 32

33 Typical Issues Heathrow Airport Express Tunnel August 16, 2017 Mott MacDonald 33

34 Typical Issues Shafts/Portals Shafts Diameter Excavation Support Crane(s) Workers Materials Equipment Ventilation Power Portals Access Staging area Slope stability Support Monitoring Efficiency Reclaimation August 16, 2017 Mott MacDonald 34

35 Typical Issues Interstate H-3 Trans Koolau Tunnel August 16, 2017 Mott MacDonald 35

36 Typical Issues Others Ground Improvement Dewatering Grouting Spiling Freezing Muck Hauling Treatment Disposal Conveyors Environmental Settlement Traffic Dust Noise Instrumentation Trigger levels Timeliness Mitigation plans Interventions When How Observation August 16, 2017 Mott MacDonald 36

37 Typical Issues SFO Clean Water Program Lake Merced Tunnel August 16, 2017 Mott MacDonald 37

38 In closing, the Construction Manager must: DOCUMENT THE HELL OUT OF THINGS. IF IT ISN T WRITTEN DOWN, IT NEVER HAPPENED. RFIs Submittals Field changes Field visits Site meetings Documentation Documentation Documentation August 16, 2017 Mott MacDonald ` 38

39 Key to Success is Good Communication Early and Often August 16, 2017 Mott MacDonald 39

40 QUESTIONS?