Transcript Micropiles

DSI – Ductile Iron Micropiles
International Society for Micropiles
London, May 2009
Florian Stützel, DSI-TS
Agenda

Introduction

Production

Installation

Load capacity

Summary

Video
Agenda

Introduction

Production

Installation

Load capacity

Summary

Video
Introduction
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Driven tube

Ductile cast iron
Agenda

Introduction

Production

Installation

Load capacity

Summary

Video
Agenda

Introduction

Production

Installation

Load capacity

Summary
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Video
Production

Centrifugal casting
Production

Heat treatment

Transformation grey  ductile cast iron
Agenda

Introduction

Production

Installation

Load capacity

Summary

Video
Agenda

Introduction

Production

Installation

Load capacity

Summary

Video
Installation
Drive & grout
= skin friction
Dry driven
= end bearing
Pile head
Soft soil
Pile tube
Soft soil
Coupler
Medium dense
gravel
Dense
sand
Loose
sand
concrete
Pile shoe
Rock
Installation - Endbearing piles

Usually non-grouted

Driven until a certain set-criteria is
fulfilled (e.g. progress < 20 mm / minute)

If grouted piles are driven to that set, then
the pile is basically an endbearing pile
with additional load bearing capacity from
skin friction
Installation - Endbearing piles
Foot for
end bearing piles
Installation - Endbearing piles
Installation Friction piles

Simultaneously driven & grouted

Driven into a layer of “good” soil

Steady control and monitoring of driving
progress required
Friction piles
Installation - Friction piles
Agenda

Introduction

Production

Installation

Load capacity

Summary

Video
Agenda

Introduction

Production

Installation

Load capacity

Summary

Video
Load capacity

End bearing piles are driven to set
e.g. progress less than 20mm / minute

Skin friction piles can be stopped before
full set
Load capacity - Friction piles
1st information: soil-expertise
Load capacity - Friction piles
2nd information: penetration test with DPH
Load capacity - Friction piles
3rd information: Actual driving record
Zeit in sec.
0
0-0
0-1
1-2
2-3
3-4
Eindringtiefe in m
4-5
5-6
6-7
7-8
8-9
9-10
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
90
95
100
Load capacity - Friction piles
Comparison
Zeit in sec
0
0-0
0-1
1-2
2-3
3-4
Eindringtiefe in m
4-5
5-6
6-7
7-8
8-9
9-10
10-11
5
10
15
20
25
30
35
40
45
50
55
Load capacity - Friction piles

Driving stopped after 6 m protrusion in a layer,
where the driving time exceeded 30secs / 1m

6m x 0.63m²/m x 150 kN/m² = 570 kN
Load capacity - Friction piles
Pile test
Load capacity - Friction piles
Pile test
Vertical displacement [mm]
load / time
load / displacement curve
Load [kN]
Agenda

Introduction

Production

Installation

Load capacity

Summary

Video
Agenda

Introduction

Production

Installation

Load capacity

Summary

Video
Summary
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Installation by excavator

Suitable for restricted area

No break down of pile head

Installation into difficult
ground condition

No wastage of pile section

Easy & fast
DSI – Ductile Iron Micropiles
International Society for Micropiles
London, May 2009
Florian Stützel, DSI-TS