Notes
Outline
"Microtunneling Pipe"
  Microtunneling Pipe
  Pipe Replacement Pipe
Microtunneling Pipe Requirements
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Considerations for Successful Projects
  Specifying and Selecting the Right Pipe
  Joint Design
  Project Considerations
  Standards and Literature
Jacking Pipe Installation Methods
Microtunneling
Pilot Tube ,
6” to 18” diameter up to 100 meter drives
Slurry microtunneling , larger diameter - 7000 ft drives
Uses laser guidance system, accuracy +- 1.0 inch
Pipe Replacement
Push type pipe bursting/pipe insertion
Replace with new pipe
Upsize for more capacity
No long strings of fused pipe
Components of a Slurry Microtunneling System
Wet & Deep Conditions are Ideal for Microtunneling
Save $ With Design Innovations Using Microtunneling
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Jacking Load Parameters

 Longest VCP Drive 650+ ft.    (Jan. 1998)
New Developments in Rock Cutting Heads
Rocks Larger Than Machine Can Be Cut But Cutter Bits Can be Expensive
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Pipe Design has Evolved
Sewerage Treatment in 1930
99.3% Dilution,
(ENR, Metcalf and Eddy)

Infiltration was Desirable when Most of Today’s Sewers were Installed
New Manufacturing Techniques and Designs are Superior to those of the Past for VCP
Natural Advantages of Clay
100 Years Life Guaranteed !
Pipe Replacement with Denlok™ Pipe
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Jacking Loads – Actual Readings
Typical Joint Design for Jacking Pipe
Pipe Loadings Are Affected
By Joint End Squareness
The Effect of One Pipe Can Be Multiplied With the Worst Case Scenario of Two Ends
This Effect is Limited by the Overcut of the Machine Causing Point Loading
Standards Should Allow Minimal Dimension Tolerances
Standards Should Allow Minimal Dimension Tolerances
Ripley’s Oxford Univ. Study (Excerpts)
ATV Standard
Calculation of Driven Pipes
Spreadsheets can provide for quick analysis
Cushion Ring Material Performance
Relative Pipe to Pipe Angle Affects Pipe Loading
Loading of Cushion Ring  Results in Permanent Reduction in Thickness
The Reduced Thickness Results in Higher Loadings in psi
Calculation of Pipe Loading During Installation
Laser Guided Machines Can Report Line and Grade Digitally
Loading is Affected by Cushion Material and Pipe Material
Is Limited to Assumption that Pipe Follows Cut and Prior Cushion Loading and Correct Readings
Drive Information Allows for Analysis of Installation
Line and Grade Does Not Give a Complete Understanding Without Added Analysis
Relative Pipe to Pipe Angle Affects Pipe Loading
Joint Loading vs. Deflection Calculator
Loading of Cushion Ring  Results in Permanent Reduction in Thickness from Prior Stress of Wood Material
The Reduced Thickness Results in Higher Loadings in psi
Stronger Jacking Capacity of Pipe Allows for Longer Drives
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Pipe Loadings
The Construction Loads and the in Use Loads are Calculated per ATV Standards
Includes Highway, Railroad and Construction Loads
Considers Water table, Soil type and Pipe Material and Strength
Ask Your Can Clay Representative for Spreadsheet to Calculate the ATV Safety Factor
Pipe Manufacturing Standards
ISO 9002 Quality System
NSF  and TUV Certified
EN 295-7 European Standards for Clay Pipe
ASTM C 1208 Manufacturing Standard for Clay Pipe
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North American Represented Microtunneling Machine Manufacturers
Akkerman  (United States)
Herrenknecht (Germany)
Iseki   (Japan)
Soltau   (Germany)
Traffic and Business Interruptions Are Minimized




Cairo’s Pyramids are 5000 yrs old – many pipe materials only estimate a 50 year life, in Cairo that would be 100 replacements.
Use VCP for long life !!
Jacking Pipe Recommendations
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