“Minipiling - Access the right solution”

Slide 1

Branlow Piling SolutionsIWM Presentation 2004

Paul Woodfield

Technical Director

Slide 2

“Minipiling - Access the right solution”

Gerrards Cross, London - Mini-piles for new Tunnel

• 2300 No. x 9m deep x 450mm dia. Piles (Temp. Cased/Augered)• 650 kN Compression 100 kN tension 150 kN Shear• Difficult Access. Restricted mast heights• Some possession working• Stiff Clays• 2 x D spacing of piles

Slide 3

“Minipiling - Access the right solution”

• 20 No. Dynamic Load Tests

• 20 No. Static Load Tests

• Verification of vertical capacity

• Automated pile testing (in restricted possession areas)

Gerrards Cross, London - Mini-piles for new Tunnel

Slide 4

“Minipiling - Access the right solution”

Asda (Wal-Mart), Belvedere - Mezzanine Floor Piles

• 750 No. x 20m deep x 273mm or 323mm - Bottom Driven (permanently cased)

• 600 kN compression

• 60 kN shear

• 450mm dia. Core in existing 350mm thick slab

• 10 - 15m of soft alluvium

• Limited Headroom, Restricted Access

Slide 5

“Minipiling - Access the right solution”

• Clients Brief focused on ‘speed’

• 500 No. piles in warehouse in 4 weeks

• Up to 7 rigs

• No Spoil

Asda (Wal-Mart), Belvedere - Mezzanine Floor Piles

• Design Challenge for pile -pilecap connection to cater for eccentric loaidng (CHS + plate)

Slide 6

“Minipiling - Access the right solution”

Sherriffs Court, Glasgow, Scotland

Façade Retention Micropiles

• 300 No. piles x 10m deep

• 40mm dia bar with 75mm dia bit

• 150 - 200 kN tension/compression

• Sands & Gravels

• Tight deflection criteria (H/750)

Slide 7

“Minipiling - Access the right solution”

• Speed (once again) critical - 300 piles installed in 2 weeks

• Preliminary tests carried out to confirm working loads ( dia. approx. 150mm)

Sherriffs Court, Glasgow, Scotland

Façade Retention Micropiles