Nothing Special   »   [go: up one dir, main page]
Scribd Logo
Upload

Welcome to Scribd!

  • 82 views

    PJA Design Presentation

    Uploaded by

    andy_miller4
    This document summarizes key considerations for pipe jacking design and best practices. It discusses that pipe jacking links soils, jacking shafts, pipes, shields, and jacking loads through engineering. Soils investigation is important and influences excavation method, temporary works, length, pipes and ground stabilization. Design considerations include ground conditions, excavation method, temporary works, jacking loads, lubrication, pipes and joints. Best installation practices involve careful steering, loading, and comprehensive record keeping.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd

    PJA Design Presentation

    Uploaded by

    andy_miller4
    82 views21 pages
    This document summarizes key considerations for pipe jacking design and best practices. It discusses that pipe jacking links soils, jacking shafts, pipes, shields, and jacking loads through engineering. Soils investigation is important and influences excavation method, temporary works, length, pipes and ground stabilization. Design considerations include ground conditions, excavation method, temporary works, jacking loads, lubrication, pipes and joints. Best installation practices involve careful steering, loading, and comprehensive record keeping.

    Original Description:

    Copyright

    © Attribution Non-Commercial (BY-NC)

    Available Formats

    PDF, TXT or read online from Scribd

    Did you find this document useful?

    Is this content inappropriate?

    This document summarizes key considerations for pipe jacking design and best practices. It discusses that pipe jacking links soils, jacking shafts, pipes, shields, and jacking loads through engineering. Soils investigation is important and influences excavation method, temporary works, length, pipes and ground stabilization. Design considerations include ground conditions, excavation method, temporary works, jacking loads, lubrication, pipes and joints. Best installation practices involve careful steering, loading, and comprehensive record keeping.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    82 views21 pages

    PJA Design Presentation

    Uploaded by

    andy_miller4
    This document summarizes key considerations for pipe jacking design and best practices. It discusses that pipe jacking links soils, jacking shafts, pipes, shields, and jacking loads through engineering. Soils investigation is important and influences excavation method, temporary works, length, pipes and ground stabilization. Design considerations include ground conditions, excavation method, temporary works, jacking loads, lubrication, pipes and joints. Best installation practices involve careful steering, loading, and comprehensive record keeping.

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    of 21

    Pipe Jacking Design and Best Installation Practice

    Prepared by the Pipe Jacking Association

    Key Considerations
    Pipe Jacking is an integrated system linking:

    soils jacking shafts pipes shields jacking loads engineering

    Soils Investigation
    Soils investigation is key:
    This influences excavation method temporary works length pipes ground stabilisation

    Soils Data Requirements


    Differing ground needs to be assesed as appropriate:

    Non-cohesive soils Cohesive soils Mixed soils Fill Rock

    Water presence is a key factor

    Unstable Ground Conditions

    Tunnelling methods depend on the stability of the ground Solutions to instability are either geotechnical processes or physical constraint Geotechnical options are extensive

    Excavation: Open Face

    Hand shields

    Excavation: Open Face

    Hand shields Backacter

    Excavation: Open Face

    Hand shields Backacter Cutter boom

    Excavation: Closed Face

    Pressurised slurry Compressed air Earth pressure balance

    Temporary Works: Shafts and Shield Entry


    Segmental Precast or insitu Piled Sheeted or timbered Battered Anchorages Shield entry and exit

    Temporary Works: Thrust Walls

    The thrust wall takes the full jacking load Spreaders distribute the load Thrust wall failure key risk

    Temporary Works: Manholes

    Manhole requirements vary Shafts bases can be enlarged Caissons can fulfil mutiple roles Manhole utilisation impacts on project costs

    Jacking Lengths and Friction Loads


    Design variables include:

    thrust walls pipe design interjacks friction lubricants spoil removal engineering

    Jacking Loads
    Jacking loads comprise:

    face loads pipe string weight friction misalignment time delays

    Frictional forces 0.5 to 2.5 tonnes per square metre

    Lubrication

    Bentonite Soil type dependent Foams

    Pipe Jacking Pipes

    Concrete jacking pipes: EN 14457 Installation forces are key Follow manufacturers recommendations

    Best Installation Practice: Loading

    Thrust load and anchorage Load transfer Control/failsafe Interjacks

    Best Installation Practice: Steering


    Tolerances: 75mm for line, 50mm for level Setup and shield entry Regular checks Cautious realingment

    Best Installation Practice: Records


    Monitoring Main survey checks Line and level Shield position Pipe rolling Main jacking load Interjack load Shield load Total load Surface checks

    Summary
    Design:

    Ground Excavation method Temporary works Jacking loads Lubricants Pipes and joints

    Installation:

    Steering Loading Records

    Pipe Jacking Association


    10 Greycoat Place, London SW1P 1SB Tel: 0845 070 5201 Fax: 0845 070 5202 Email: secretary@pipejacking.org Website: www.pipejacking.org

    You might also like