TRENCHLESS TECHNOLOGY HOW TO ACHIEVE THE DESIRED RESULT

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TRENCHLESS TECHNOLOGY - HOW TO ACHIEVE THE
DESIRED RESULT

• Presenter
• Philip McFarlane

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Sewer Rehabilitation Survey 2001

• Average Council Expenditure
• 670k per year
• Spending more than 1mil per year
• 5 Councils
• Mostly maintenance of individual assets
• Some major upgrade projects
• Most expected expenditure to increase

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LEVEL OF SATISACTION
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REASONS

• Unreasonable expectations of what could be
  achieved
• No-one told us that would be a problem
• We did not think that was there
• Not sure if contractor delivered what we wanted

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TYPICAL PROJECT MANAGEMENT APPROACH
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MORE UNCERTAINTIES WITH TRENCHLESS

• Ground conditions
• Existing pipe
• Performance of the existing system
• Performance of installation techniques

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TRENCHLESS TECNOLOGY APPROACH
Project Definition
Determine performance of existing network
Investigate condition of existing system
Investigate subsoil conditions
Design
Implementation
Evaluation
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PROJECT DEFINITION

• Feasibility of project is investigated
• Project budget determined
• Project programme is determined
• Roles and responsibilities allocated
• Clear quantifiable objects set

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TYPICAL OBJECTIVES

• Increased capacity
• I/I Reduction
• Reduction in frequency of sewer overflows
• Reduction in frequency of blockages
• Less risk of collapse

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DETERMINATION OF PERFORMANCE OF CURRENT SYSTEM

• Sewer gauging and modeling
• Spot gauging
• Location of blockages
• Location and frequency of overflows
• Location of surcharging manholes
• Locations where exfiltration occurs

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SUBSOIL INVESTIGATIONS

• Purpose to Identify
• Hard/Softness of ground
• Variable ground
• Position of Interfaces
• Services

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SUBSOIL INVESTIGATIONS

• Types of Investigations
• History of area
• Local knowledge
• Boreholes
• Test Pits

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DETERMINATION OF THE CONDITION OF THE EXISTING
SYSTEM

• Smoke and dye testing
• CCTV inspection
• Inspect/test manholes
• Inspect/testing private drainage

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SMOKE TESTING
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CCTV INSPECTIONS
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SEE THE PIPE
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(No Transcript)
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Profiler
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Profiler Outputs
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Identify Other Constraints

• Areas where excavations not desirable
• Permitted working times
• Permitted working areas
• Bypass pumping requirements
• Environmental considerations

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DESIGN -
FACTORS TO CONSIDER

• Project objectives
• Hydraulic requirements
• Subsoil conditions
• Existing conditions
• Construction considerations
• Required performance of new works

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ITEMS TO BE ADDRESSED IN PERFORMANCE SPECIFIATION

• Contractors responsibilities
• Minimum performance requirements
• Risks
• Constraints
• Existing conditions
• Health Safety and Environmental Issues
• Quality assurance procedures
• How will performance be evaluated
• What factors will the client consider in their
  evaluation

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IMPLEMENTATION
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CONTRACTORS QUALITY ASSURANCE DOCUMENTATION
Quality Manual
Project Plan
Process Plans
Inspection and Test Plans
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QUALITY ASSURANCE AUDITS
Check contractors QA documentation
Check actual work processes
Check quality records
Compliance Audits
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TYPICAL COMPLIANCE AUDITS

• Samples of liner tested for strength
• Hydrostatic test
• CCTV inspection

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Evaluation

• Sewer gauging and modeling
• Has frequency of blockages reduced
• Long-term monitoring of performance

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TRENCHLESS TECNOLOGY APPROACH
Project Definition
Determine performance of existing network
Investigate condition of existing system
Investigate subsoil conditions
Design
Implementation
Evaluation