Prologue to Trenchless Methods

Presentation Transcript

Prologue to Trenchless Methods Presented by Glenn M. Boyce, PhD, PE Senior Associates April 21, 2009

Presentation 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

Types of Infrastructure Gas – Pressure Water – Pressure Sewer – Gravity Drainage – Gravity Power – Non-gravity Communications – Non-gravity

Trenchless Methods Impact moling Pipe smashing Auger drilling Pilot tube Pipe jacking/Microtunneling Conventional burrowing Horizontal directional penetrating Pipe blasting

Generic 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

What to Do? Pick the correct strategy Use set up "Benchmarks" Collect data/research Plan ahead Conduct chance appraisals Include components to deal with clashes

Use the Right Method Open cut Horizontal Directional Drilling Auger drilling Pipe slamming Pipe jacking Microtunneling Tunneling Pilot Tube 1996

Auger Boring Road intersections Cohesive soils Short separations Above water table Need steel packaging Minor controlling

60-inch Diameter SBU-A

Pilot Tube Method Medium separations Straight arrangements with great exactness Variety of soils Smaller shafts Moderate hardware costs

Step 1

Step 2

Pilot Tube + "In addition to" Now utilized as a guide for other technique Auger drilling Pipe Ramming

Pipe Ramming Wide scope of breadths Soils just Continuously upheld Typically < 300' Above and beneath water table Need steel packaging No directing control

Installation Method Ramming in nonstop length or sections

Ramming in Progress

Pilot tube

Pipe Jacking Large widths Soils and blended ground Face bolstered Long separations Above the water table Steerable

Microtunneling 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

Micro versus Utility Tunneling Remotely worked Precise direction Pipes jacked from dispatch pit Continuous support to confront Conventional Rib & Lagging Tunnel Microtunnel

Tunnel Shield Construction Lining is worked inside shield. Coating does not move longitudinally after situation.

Required Axial Thrust versus Length of Drive for Same Diameter

Open Cut What happens Trenchless Understand and plan Opposite Approaches

What to Do? Comprehend the site history and potential hindrances Look at old flying photographs Conduct a geotechnical program Locate all utilities

Potential Obstructions Cobbles or Boulders Wood Fill materials Hard zones Mixed appearances

Typical 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

Typical CMP Culverts

Replacement 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

Possible Solutions

Consume the Culvert

Use Liner Plate Tunnel

Design 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

Closing 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)

HORIZONTAL DIRECTIONAL DRILLING (HDD) Samuel T. Ariaratnam, PhD, PE Arizona State University

Background Lengths up to 8,400 feet Diameters of 2" – 54" Applications: Utility conductors Pipelines Gravity sewers Force mains Horizontal remediation wells Geotechnical examinations

Pilot Bore and Tracking Pilot Bore

Drill Bits

Reaming/Hole Enlargement Reaming

Reamers

CLAY ANNULAR SPACE REGION

SAND ANNULAR SPACE REGION

Pipe Material Distribution Underground Construction Magazine 9 th Annual Survey, June 2007

Conclusions 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

PIPE BURSTING Samuel T. Ariaratnam, Ph.D., P.E. Arizona State University

Pipe Bursting Lengths normally 300-600 ft Diameters up to 42" Applications: substitution of constrain mains substitution of gravity sewers Static Head Pneumatic Head

Common 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).

Introduction 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."

Applications 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

Pipe 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

Static Method (Continuous)

Static Method (Sectional)

Pneumatic Method

Almost a wide range of pipe can be blasted … Cast press Steel Ductile iron High Density Polyethylene Polyvinylchloride Concrete Reinforced solid Asbestos bond Clay

Various Host Materials VITRIFIED CLAY STEEL CAST IRON

650mm (26") 750mm (30") 350mm (14")

Conclusions 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!

CONTRACTOR QUALIFICATIONS & PRE-QUALIFICATION

Introduction 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

Specifications Manufacturers Recommended Specifications Industry/Association Specification Guidelines Project Specific

Testing & Inspection Quality Assurance & Controls in Specifications Trained Inspectors Testing by Owner Laboratory Final CCTV Inspection of the Installed Pipe

Protection of Existing Utilities Call in Locates Obtain As-Built Maps (Shared Responsibility) Mark Utilities (Utility Owners) Confirm Utilities (Pothole) (Excavator) Protect (Excavator)

Protection of Existing Utilities – Locate Marks

As-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

Logbook/Field Notes

Contractor 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

Damage Avoidance

Trenchless 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)

Caltrans Inspector Training Classroom Field Exercises

Conclusions Well-composed determinations are critical to limit claims Hiring a capable contract based worker can be accomplished through pre-capability T