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

- Use of Drilled MicroPile Walls in Scandinavia Håkan Bredenberg www.bredenbergteknik.se 1

Scandinavia … ? www.bredenbergteknik.se 2

Drilled MicroPile Walls … www.bredenbergteknik.se 3

i Index c s • applications & examples • drilled MicroPile wall elements • supports • cover • costs • equipment • design www.bredenbergteknik.se 4

Applications • excavation temporary cut off walls • same, also serving as permanent support • bridge support /foundation www.bredenbergteknik.se 5

Excavation cut off wall www.bredenbergteknik.se 6

Temporary wall & permanent support www.bredenbergteknik.se 7

Temporary wall & permanent bridge support www.bredenbergteknik.se 8

Drilled MicroPile Walls, usual Drilling metods www.bredenbergteknik.se 9

Drilled MicroPile Walls – the Klemm 806 www.bredenbergteknik.se 10

Drilled MicroPile Walls - equipment ” The Basement Mouse” www.bredenbergteknik.se 11

Drilled (micro) Pile Walls – equipment, drilling rigs www.bredenbergteknik.se 12

Drilled MicroPile Walls – equipment for drilling Pilot Casing Drill shoe (welded to casing) Ring drill crown ( left at bottom of casing) www.bredenbergteknik.se 13

Drilled MicroPile Walls – Equipment at tube front Pilot (recovered) Ring crown – welded to tube, left at tip www.bredenbergteknik.se 14

Drilled pile walls – drill bit for 600 mm tubes www.bredenbergteknik.se 15

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 ? www.bredenbergteknik.se 16

Jet grouting to prevent soil inflow www.bredenbergteknik.se 17

Drilled MicroPile Wall – extending into rock www.bredenbergteknik.se 18

Drilled MicroPile Wall during construction www.bredenbergteknik.se 19

Drilled MicroPile Wall in rock fill www.bredenbergteknik.se 20

Excavation before cover www.bredenbergteknik.se 21

5 mm steel sheet cover beeing spot welded to drilled soldier beams www.bredenbergteknik.se 22

5 mm steel cover plates beeing cut to size (from 2 x 1 m) www.bredenbergteknik.se 23

Drilled MicroPile Wall sealed with shotcrete www.bredenbergteknik.se 24

After excavation to final level … some case pictures from 2007. www.bredenbergteknik.se 25

Drilled & driven Pile Wall, finalized (?), rock anchors www.bredenbergteknik.se 26

Drilled MicroPile Wall, Limmared www.bredenbergteknik.se 27

Liljeholmen, drilled MicroPile wall for new subway station www.bredenbergteknik.se 28

Drilled MicroPile Wall at Ringhals nuclear power plant www.bredenbergteknik.se 29

MicroPile Wall was drilled into rock www.bredenbergteknik.se 30

Drilled MicroPile Wall for new theatre building, Norrköping, Sweden www.bredenbergteknik.se 31

Drilled MicroPile Wall – shotcreted – note boulders. www.bredenbergteknik.se 32

Drilled MicroPile Wall – under & close to existing building www.bredenbergteknik.se 33

Drilled MicroPile Wall finalized www.bredenbergteknik.se 34

Drilled MicroPile Wall used as formwork www.bredenbergteknik.se 35

Drilled MicroPiles for temporary column support www.bredenbergteknik.se 36

Drilled MicroPile Wall support • soil / rock anchors • beam struts • tie-backs • … others www.bredenbergteknik.se 37

Drilled MicroPile Wall – supported by drilled soil anchors www.bredenbergteknik.se 38

Corner supported by H-beams www.bredenbergteknik.se 39

Anchor rod fixed to slab www.bredenbergteknik.se 40

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 www.bredenbergteknik.se 41

Soil – tube interaction www.bredenbergteknik.se 42

Bending moment capacity www.bredenbergteknik.se 43

Drilled MicroPile Wall – bending capacity www.bredenbergteknik.se 44

Design details www.bredenbergteknik.se 45

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 ! www.bredenbergteknik.se 46