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Micropiles

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... typical working loads and pile lengths Driven pipe piles G-piles in ... Dywidag-Systems just introduced systen into UK Driven ductile cast-iron pipe piles ... – PowerPoint PPT presentation

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Title: Micropiles


1
Micropiles UK Trends
  • Mike Turner
  • Applied Geotechnical Engineering

2
Increasing load capacity
  • 1970s 80s 200-300 kN (compression)
  • 500 kN
    achievable
  • End 1980s 500-600 kN common
  • End 1990s 1000-2000 kN

3
Diameters are also increasing
  • 500kN 125-160mm
  • 1000kN 190mm (typical)
  • 2000kN 240mm
  • - For rock-socketed micropiles

4
Increasing load and diameter
5
Diameters are also increasing for micropiles in
soils
  • Because small rigs are more powerful
  • 450mm diameter piles not uncommon with Klemm and
    Hutte-type rigs
  • Blurring divisions between piles and
    micropiles

6
Contiguous micropiled retaining walls
  • Increasing use, for
  • Restricted sites basements and city-centre
    redevelopments
  • Using 140-220mm thick-walled steel tubes
  • Supported by ground anchors or props

7
Long slender micropiles
  • High slenderness ratios (length to diameter)
  • 1001 not uncommon
  • 2001 installed and load-tested
  • 33 metres long

8
Long slender micropiles
working load and slenderness ratio
9
Long slender micropiles typical working
loads and pile lengths
10
Driven pipe piles
  • G-piles in Sweden ( Northern Europe?)
  • Dywidag-Systems just introduced systen into UK
  • Driven ductile cast-iron pipe piles (Type TRM)
    500-1100kN capacity 119-170mm OD

11
Chance-type piles
  • Mechanical auger piles, based upon the Chance
    design
  • Very useful on railway infrastructure and mobile
    phone tower installations
  • Screwfast piles

12
Ischebeck-type piles
  • Self-drilling piles and nails
  • Paul Woodfield has more details

13
Dynamic load testing
  • As an addition to static load testing
  • Mike Turner has more details
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