Prologue to Trenchless Methods Presented by Glenn M. Boyce, PhD, PE Senior Associates April 21, 2009
Slide 2Presentation Objectives Provide a superior comprehension of trenchless strategies utilized for new establishments Learn the points of interest and restrictions of the techniques Discuss temporary worker capabilities
Slide 3Types of Infrastructure Gas – Pressure Water – Pressure Sewer – Gravity Drainage – Gravity Power – Non-gravity Communications – Non-gravity
Slide 4Trenchless Methods Impact moling Pipe smashing Auger drilling Pilot tube Pipe jacking/Microtunneling Conventional burrowing Horizontal directional penetrating Pipe blasting
Slide 5Generic Size and Length Method Size Length Moling 2" - 12" 150' Ramming 8" - 72" 300' Auger Bore 8" - 60" 250' Pilot Tube 6" - 42" 300' Microtunneling 12" - 108" 1,500' Pipe Jacking >54" 3,000' HDD 2" - 48" 6,500' Tunneling >60" Any length
Slide 6What to Do? Pick the correct strategy Use set up "Benchmarks" Collect data/research Plan ahead Conduct chance appraisals Include components to deal with clashes
Slide 7Use the Right Method Open cut Horizontal Directional Drilling Auger drilling Pipe slamming Pipe jacking Microtunneling Tunneling Pilot Tube 1996
Slide 8Auger Boring Road intersections Cohesive soils Short separations Above water table Need steel packaging Minor controlling
Slide 960-inch Diameter SBU-A
Slide 10Pilot Tube Method Medium separations Straight arrangements with great exactness Variety of soils Smaller shafts Moderate hardware costs
Slide 11Step 1
Slide 15Step 2
Slide 16Pilot Tube + "In addition to" Now utilized as a guide for other technique Auger drilling Pipe Ramming
Slide 17Pipe Ramming Wide scope of breadths Soils just Continuously upheld Typically < 300' Above and beneath water table Need steel packaging No directing control
Slide 18Installation Method Ramming in nonstop length or sections
Slide 19Ramming in Progress
Slide 20Pilot tube
Slide 21Pipe Jacking Large widths Soils and blended ground Face bolstered Long separations Above the water table Steerable
Slide 22Microtunneling Range of measurements (> 12") All ground sorts Continuous face bolster Long separations Above or underneath water table Range of pipe materials Steerable to line and level
Slide 23Micro versus Utility Tunneling Remotely worked Precise direction Pipes jacked from dispatch pit Continuous support to confront Conventional Rib & Lagging Tunnel Microtunnel
Slide 24Tunnel Shield Construction Lining is worked inside shield. Coating does not move longitudinally after situation.
Slide 25Required Axial Thrust versus Length of Drive for Same Diameter
Slide 26Open Cut What happens Trenchless Understand and plan Opposite Approaches
Slide 27What to Do? Comprehend the site history and potential hindrances Look at old flying photographs Conduct a geotechnical program Locate all utilities
Slide 28Potential Obstructions Cobbles or Boulders Wood Fill materials Hard zones Mixed appearances
Slide 29Typical Machine Sizes Piercing – 2 to 3 inches Pilot Tube – 6 to 36 inches HDD – 6 to 54 inches Auger Boring – 10 to 60 inches Pipe Jacking/MT – 12 to 96 inches Pipe Ramming – 12 to 144 inches Shield – 60 to 144 inches
Slide 30Typical CMP Culverts
Slide 31Replacement Issues Need to expand estimate for oceanic section Must continue existing duct dynamic amid development Minimize costs Develop the best cross segment Use the correct materials
Slide 32Possible Solutions
Slide 33Consume the Culvert
Slide 34Use Liner Plate Tunnel
Slide 35Design Solutions Built a parallel pipe barrel Increases limit Allow the current to stay in administration Get to utilize the materials you need Slipline the current after new Built another passage and leave cover
Slide 36Closing Thoughts Methods as yet advancing Many half and half strategies rising Better arrangement control rising in twist drill drilling applications Must recognize potential deterrents (or get X-beam vision)
Slide 37HORIZONTAL DIRECTIONAL DRILLING (HDD) Samuel T. Ariaratnam, PhD, PE Arizona State University
Slide 38Background Lengths up to 8,400 feet Diameters of 2" – 54" Applications: Utility conductors Pipelines Gravity sewers Force mains Horizontal remediation wells Geotechnical examinations
Slide 39Pilot Bore and Tracking Pilot Bore
Slide 41Drill Bits
Slide 43Reaming/Hole Enlargement Reaming
Slide 44Reamers
Slide 45CLAY ANNULAR SPACE REGION
Slide 46SAND ANNULAR SPACE REGION
Slide 47Pipe Material Distribution Underground Construction Magazine 9 th Annual Survey, June 2007
Slide 59Conclusions HDD is a negligibly meddling trenchless development technique suited for profoundly congested urban regions and high movement zones Horizontal Directional Drilling gear is equipped for introducing an extensive variety of utilities HDD will never supplant conventional open-cut strategies; be that as it may, they supplement each other
Slide 60PIPE BURSTING Samuel T. Ariaratnam, Ph.D., P.E. Arizona State University
Slide 61Pipe Bursting Lengths normally 300-600 ft Diameters up to 42" Applications: substitution of constrain mains substitution of gravity sewers Static Head Pneumatic Head
Slide 62Common Types of Bursting Systems Pneumatic Systems - Usually incorporate a pneumatic apparatus and winch and blasts the pipe utilizing the motor vitality of the instrument. The pipe is typically joined to either the burst head or instrument. Static Systems – Usually incorporate a pressure driven power source and a pole transporting framework and utilize high tonnage to maneuver new line into place. Little Portable Systems - Either pneumatic or static for doing little measurement and short runs (e.g. laterals).
Slide 63Introduction Emerging field of pipe "Substitution of the host pipe by dividing the current conductor and introducing a totally new pipe of equivalent measurement or bigger in its place."
Slide 64Applications Total pipe substitution Typical upsize as much as 20 – 30% Industrial & Municipal - Main Line & Laterals Various host and item pipe materials Continuous or Sectional pipe establishment
Slide 65Pipe Bursting Feasibility May accomplish bring down costs contrasted with open trench Less development time Minimal unearthing Social cost reserve funds Reduces ground settlement Low ecological effect
Slide 66Static Method (Continuous)
Slide 67Static Method (Sectional)
Slide 68Pneumatic Method
Slide 69Almost a wide range of pipe can be blasted … Cast press Steel Ductile iron High Density Polyethylene Polyvinylchloride Concrete Reinforced solid Asbestos bond Clay
Slide 70Various Host Materials VITRIFIED CLAY STEEL CAST IRON
Slide 71650mm (26") 750mm (30") 350mm (14")
Slide 72Conclusions Pipe blasting is the main trenchless strategy fit for introducing another pipe of equivalent or bigger distance across as a substitution choice Almost any sort of existing funnel can be blasted and supplanted with most pipe materials Proper arranging is basic to venture achievement!
Slide 73CONTRACTOR QUALIFICATIONS & PRE-QUALIFICATION
Slide 74Introduction The larger part of trenchless temporary workers are solid and take after great establishment hones However, offices must know about those few "cowpoke" contractual workers Qualifying temporary workers is a prescribed practice for trenchless tasks to guarantee utilization of equipped contractual workers
Slide 75Specifications Manufacturers Recommended Specifications Industry/Association Specification Guidelines Project Specific
Slide 76Testing & Inspection Quality Assurance & Controls in Specifications Trained Inspectors Testing by Owner Laboratory Final CCTV Inspection of the Installed Pipe
Slide 77Protection of Existing Utilities Call in Locates Obtain As-Built Maps (Shared Responsibility) Mark Utilities (Utility Owners) Confirm Utilities (Pothole) (Excavator) Protect (Excavator)
Slide 78Protection of Existing Utilities – Locate Marks
Slide 79As-Builts, Operator Logs, Notes Contractor is in charge of denoting the arrangements to demonstrate all vertical and flat deviations between the outline and real establishment Operator logs/notes ought to be kept up and refreshed day by day by the Contractor and ought to incorporate Pipe number, profundity, pitch, controlling summons, and notes
Slide 80Logbook/Field Notes
Slide 81Contractor Submittals Proof of accomplishment on earlier comparable activities Pipe material, breadth, length Make/model of gear, direction hardware, liquid blend Slurry transfer arrange Contingency arrange Safe arrangement and conventions Certification by the maker that the Contractor's staff are prepared in the utilization of the hardware Training confirmation for pipe establishment Fusion preparing affirmation for HDPE Construction Plan & Installation Schedule Traffic Control Plan
Slide 82Damage Avoidance
Slide 83Trenchless Training Courses Horizontal Directional Drilling Good Practices Pipe Bursting Good Practices New Installation Methods Good Practices Cured-in-Place Pipe (CIPP) Good Practices Sewer Laterals Rehabilitation & Replacement (www.nastt.org)
Slide 84Caltrans Inspector Training Classroom Field Exercises
Slide 85Conclusions Well-composed determinations are critical to limit claims Hiring a capable contract based worker can be accomplished through pre-capability T
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