Agenda for Today s Workshop

Transcription

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2 Agenda for Today s Workshop 10:00 to 10:45: Introduction Dr. Mo Najafi 10:45 to 11:15: Research and Testing Mr. Jwala Sharma 11:15 to 11:45: Cost Comparison Ms. Trupti Kulkarni 11:45 to 12:00: Lab Tour & Testing - Mr. Jorge Forteza 12:00 to 12:30: Break for Buffet Lunch. 12:30 to 1:30: Details of Restrained Joint PVC Mr. Craig Fisher

3 Introduction to CUIRE Trenchless Technology Overview of HDD Method Comparing Main Features of HDD HDD Installation Process Soil Investigations Site Investigations Case Studies Conclusions

4 RESEARCH CONSORTIUM OVERVIEW Center for Underground Infrastructure Research & Education (CUIRE) Center for Underground Infrastructure Research & Education

5 RESEARCH CONSORTIUM THE CONSORTIUM Center for Underground Infrastructure Research & Education (CUIRE) Center for Underground Infrastructure Research & Education Grouping of university, municipal, industrial, business and governmental representatives committed to the advancement of knowledge in materials, methods and equipment used in underground infrastructure.

6 CUIRE Board Members TT Technologies Northwest Pipe

7 RESEARCH CONSORTIUM THE ENGINEERING PROCESS & YOUR INVESTMENT Center for Underground Infrastructure Research & Education (CUIRE) Advanced Research What is out there? Applied Research What can I do with it? Advanced Engineering What might it look like? Applied Engineering How can I produce it?

8 Outreach Activities Inspector Schools New Construction HDD Pipe Renewal Pipeline Design & Construction January 25-27, Houston

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11 Physical Testing Lab CUIRE Facilities

12 Computer Lab and Offices CUIRE Facilities

13 CUIRE PIPE INSPECTION EQUIPMENT CUIRE Equipment

14 Soil Resistivity Imaging and Software CUIRE Equipment

15 Trenchless Technology Methods Trenchless Methods Construction Methods Renewal Methods Utility Tunneling Pipe Jacking Horizontal Earth Boring Horizontal Auger Boring HDD Microtunneling Pipe Ramming Cured-in-Place Pipe Close-fit Pipe Thermoformed Pipe Sliplining Modified Sliplining In-line Replacement Localized Repair Lateral Renewal Coatings & Linings Manhole Renewal

16 Benefits of Trenchless Technology Do not assume open-cut is less expensive than trenchless technology

17 Benefits of Trenchless Technology Comparison of Cost Factors Between Open-Cut & Trenchless Technology Open-Cut Trenchless Technology Depth Major Minor Diameter Moderate Moderate Soil Conditions Major Moderate to Minor Obstructions Major Minor Water Table Major Minor Existing Utilities Major Major to Moderate Damage To Pavement Major Minor Reinstatement Major Minor Traffic Major Minor Safety Issues Major Minor Productivity Major Minor Environmental Issues Major Minor

18 Should You Go Trenchless? Is the pipe 5 ft deep or more? Is the pipe below water table? Is soil unstable? Is underground congested with other utilities? Is it in urban area? Are drive lengths more than 200 ft? Is it under a roadway? Can the pipe be renewed or spot repaired? Is it in residential area? If yes to 2 of above questions, consider trenchless technology!

19 Main Challenges for Trenchless Technology Projects Locating Existing Underground Utilities Lack of Standard Guidelines & Specifications Lack of Proper Geotechnical Investigations Matching the Correct Method to the Project Conditions

20 Main Causes of Project Problems Specification Interpretation Lack of Inspector & Operator Experience and Proper Training

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26 Historical Background Originated from the oil fields in the 1970s and evolved by merging technologies used in utilities and water well industries. The first known river crossing using the HDD method took place in Approximately 615 ft of 40 in. diameter steel pipe was installed across the Pajaro River near Watsonville, California, for the Pacific Gas and Electric Co. (DCCA 1994). Titan Contractors (Martin Cherrington) introduced Horizontal Directional Drilling, or HDD, in The Mini-HDD was developed by Flow Industries in 1978.

27 Usually performed in two (or more) steps: Drilling of pilot hole using a steerable drill head & locator system Backreaming to increase pilothole diameter & pullback of product pipe Product pipe sizes up to about 60 in. Typically used for pressure pipelines and conduits

28 Characteristic of Horizontal Directional Drilling Method Diameter Range (inches) Maximum Installation (feet) Pipe Materials Typical Applications Accuracy ( + or - ) Mini-HDD 4-12 < 600 PE, PVC, DIP Pressure pipe & cables Varies Midi-HDD ,000 PE, Steel, PVC, DIP Pressure pipe Varies Maxi-HDD < 60 >2,000 PE, Steel Pressure pipe Varies

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32 Source: John Hair & Associates

33 Source: John Hair & Associates

34 Source: John Hair & Associates

35 Source: John Hair & Associates

36 Source: John Hair & Associates

37 HDD Growth 12 Rigs in 1984 Over 2,000 Rigs in 1995 Today, Approximately 30,000 Rigs Worldwide

38 Soft to very soft clays, silt & organic deposits Medium to very stiff clays and silts Hard clays and highly weathered shale Very loose to loose sands (above water table) Medium to dense sands (below the water table) Medium to dense sands (above the water table) Gravels & cobbles less than 2-4 in. diameter Soils with significant cobbles, boulders and obstructions larger than 4-6 in. diameter Weathered rocks, marls, chalks and firmly cemented soils Significantly weathered to unweathered rocks Yes Yes Yes Yes Yes Yes Marginal No Yes Marginal

39 Product Diameter Reamed Diameter < 8 Diameter of product Diameter of product x 1.5 > 24 Diameter of product + 12 Reamer size over the bell

40 American Augers Barbco Central Mine Equipment Ditch Witch Laney Robbins TT Technologies Tulsa Rig Iron Vermeer Manufacturing

41 Sales Telecommunic ations 20% Other 15% Sewer 10% Electric 11% Water 13% Gas Distribution 18% Oil/Gas 13% Underground Construction Magazine, 2003

42 No. of rigs currently owned Locating/ tracking equipment Drill pipe (ft) Mud mixing equipment Revenues from HDD 4 4 4, ,200,000 Persons employed Estimated no. of drill rigs in the next year Business outlook 15 6 Optimistic Cost of $5-$7/in./ft

43 Drill Rod Product Pipe Back Reaming Stuck Pipe Drilling Fluids Migration Drilling Fluids Mud Pumps Locating Drill Off-Target Ground Settlement Existing Utilities Soil Information Other

44 Ground conditions are variable Not every method is suitable for every ground conditions No site investigation can precisely predict actual ground conditions & behavior

45 Evaluate Ground Conditions & Variability Identify Obstacles Determine Feasibility Select Alignment to Minimize Risks

46 Decide on type and mix of drilling fluids. Decide on type of drill bit or reamer. Decide on volume of fluids. To have a safe and productive drilling operation.

47 Cohesionless: Gravel Sand Silt Cohesive: Clay Organic Soil Coarse-Grained Soil: Gravel Sand Fine-Grained Soil: Silt Clay

48 Boulders: More Than 200 mm (8 in.) Cobbles: Between 100 mm to 200 mm (4 to 8 in.) Gravel: Between 2 mm to 100 mm (4 in.) Sand: Between 0.1 to 2 mm Silt: Between to 0.1 mm Clay: Less Than mm

49 Make Use of Existing Data Aerial Photos Geology Maps & Reports Soil Maps Existing Boring Logs Land Use Records Site Visit Potholes, Pits, Fluid Returns, Etc.

50 Potential Obstacles Cobbles & Boulders High Percentage of Gravel Wood Abandoned Structures (Metal, Concrete) Unknown Fill Materials Unanticipated Utilities Overhead Utilities Soil Contamination

51 Potential Obstacles Mixed Face Conditions Soil Over Rock Layered Soil

52 Location Eastland, Texas Date of Installation March 10, 2010 Contractor HDD Subcontractor Darnell and Dickson Construction Inc. Collier Directional Drilling Length of Installation 318 ft (96.92 m) Nominal Diameter of the Pipe 6 in. (150 mm) Dimension Ratio (DR) 18 Depth from Ground to Center of the Pipe Crew Details Equipment 4 ft (1.22 m) 1 Superintendent, 3 Workers, 1 Backhoe Operator, HDD Machine Model: Ditch Witch JT 2720, Backhoe, 1 HDD Machine Operator, 1 Front-end Loader Operator, 1 Truck Operator Slurry Truck, and Front-end Loader Vacuum Excavator,

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55 Location Clay County, Florida Date of Installation Owner Contractor Project Contact Clay County Utility Authority Bore Hawg, Inc, Contact: Jason Riggs, President Steve Rencarge, Operations Coordinator, Length of Pipe Installation 540 ft (165 m) Nominal Diameter of the Pipe Dimension Ratio (DR) 18 Depth from Ground to the Center of the Pipe Crew Details Equipment 4 in. (100 mm) 5 ft. (1.52 m) 1 Superintendent, 3 Workers, 1 Backhoe Operator, HDD Machine Model: Ditch Witch JT HDD Machine Operator Truck Operator Vacuum Excavator Slurry Truck Backhoe

56 Exit Pit Existing 2 Galvanized Steel Water Pipe 16 Corrugated Steel Storm Sewer Pipe Proposed 4 PVC Water Pipe Water Tank Vacuum Excavator Entry Pit HDD Rig

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58 HDD is one of the fastest growing trenchless construction methods. Installing new infrastructure using open cut construction, can equate to high social costs. For successful HDD installations, proper planning and site investigations as well as operator and inspector training are required. The use of trenchless technologies in water and sewer applications has been growing.

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60 Mohammad Najafi, Ph.D., P.E. CUIRE Director Department of Civil Engineering The University of Texas at Arlington Box Nedderman Hall Arlington, TX Phone: Fax: