- Use of Drilled MicroPile Walls in Scandinavia Hkan Bredenberg - - PowerPoint PPT Presentation

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- Use of Drilled MicroPile Walls in Scandinavia Hkan Bredenberg - - PowerPoint PPT Presentation

Oct 31, 2023 25 likes •485 views

- Use of Drilled MicroPile Walls in Scandinavia Hkan Bredenberg www.bredenbergteknik.se 1 Scandinavia ? www.bredenbergteknik.se 2 Drilled MicroPile Walls www.bredenbergteknik.se 3 i Index c s applications & examples

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  • Use of Drilled MicroPile Walls in Scandinavia

Håkan Bredenberg

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Scandinavia … ?

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Drilled MicroPile Walls …

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i c s

  • applications & examples
  • drilled MicroPile wall elements
  • supports
  • cover
  • costs
  • equipment
  • design

Index

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Applications

  • excavation temporary cut off walls
  • same, also serving as permanent support
  • bridge support /foundation
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Excavation cut off wall

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Temporary wall & permanent support

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Temporary wall & permanent bridge support

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Drilled MicroPile Walls, usual Drilling metods

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Drilled MicroPile Walls – the Klemm 806

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Drilled MicroPile Walls - equipment

” The Basement Mouse”

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Drilled (micro) Pile Walls – equipment, drilling rigs

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Drilled MicroPile Walls – equipment for drilling

Pilot Ring drill crown ( left at bottom of casing) Casing Drill shoe (welded to casing)

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Drilled MicroPile Walls – Equipment at tube front

Pilot (recovered) Ring crown – welded to tube, left at tip

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Drilled pile walls – drill bit for 600 mm tubes

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Excavation

  • How to keep soil in place between space between tubes ?
  • Which spacing between tubes ?
  • If ground water level above excavation bottom ?
  • Which material for cover ? Wood, steel, shotcrete ?
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Jet grouting to prevent soil inflow

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Drilled MicroPile Wall – extending into rock

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Drilled MicroPile Wall during construction

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Drilled MicroPile Wall in rock fill

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Excavation before cover

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5 mm steel sheet cover beeing spot welded to drilled soldier beams

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5 mm steel cover plates beeing cut to size (from 2 x 1 m)

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Drilled MicroPile Wall sealed with shotcrete

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After excavation to final level … some case pictures from 2007.

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Drilled & driven Pile Wall, finalized (?), rock anchors

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Drilled MicroPile Wall, Limmared

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Liljeholmen, drilled MicroPile wall for new subway station

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Drilled MicroPile Wall at Ringhals nuclear power plant

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MicroPile Wall was drilled into rock

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Drilled MicroPile Wall for new theatre building, Norrköping, Sweden

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Drilled MicroPile Wall – shotcreted – note boulders.

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Drilled MicroPile Wall – under & close to existing building

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Drilled MicroPile Wall finalized

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Drilled MicroPile Wall used as formwork

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Drilled MicroPiles for temporary column support

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Drilled MicroPile Wall support

  • soil / rock anchors
  • beam struts
  • tie-backs
  • … others
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Drilled MicroPile Wall – supported by drilled soil anchors

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Corner supported by H-beams

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Anchor rod fixed to slab

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Design of drilled MicroPile walls

  • Soil pressure active/passive
  • Forces, bending moments
  • Section analysis :

– Axial capacity – Bending capacity – Buckling – Local buckling (thin wall structures)

  • Deflection, soil movements
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Soil – tube interaction

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Bending moment capacity

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Drilled MicroPile Wall – bending capacity

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Design details

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Conclusions

  • Consider to use Drilled MicroPile walls when:

– Obstacles in soil prevents sheet piling – Small equipment required at site – Time schedule of critical importance – Temporary piles can be used for permanent use – If below ground water level, lowering is required – If soil flow use jet grouting/small excavation steps – Thats all for now …drill carefully out there !