[Use of Screw Piles for Remedial Work on Foundations]

by

Acknowledgement

I would take this opportunity to thank my research supervisor, family and friends for their support and guidance without which this research would not have been possible.

DECLARATION

I, [type your full first names and surname here], declare that the contents of this dissertation/thesis represent my own unaided work, and that the dissertation/thesis has not previously been submitted for academic examination towards any qualification. Furthermore, it represents my own opinions and not necessarily those of the University.

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Abstract

Drilled displacement (DD) piles (commonly known as screw piles in Europe) are being increasingly used as foundation elements for structures, particularly in projects requiring accelerated construction or involving the rehabilitation of foundations of existing, overstressed structures. Different types of DD piles are available in practice; each type is classified according to the design of the drilling tool and associated installation method. Installation of DD piles causes substantial changes in the state of the soil surrounding the pile. These changes result from the complex loading imposed on the soil by expansion of a cylindrical cavity to make room for the specially designed drilling tool, by torsional and vertical shearing as the drilling tool gradually moves down into the ground, and by the reversed vertical shearing caused by extraction of the drilling tool from the ground. This report consolidates the information available on DD piling technology, reviews and compares the empirical design methods typically used for these piles, and presents a numerical approach to model the shaft resistance of DD piles in sand. The installation of DD piles produces greater radial displacement of soil than that produced by nondisplacement piles (e.g., drilled shafts), particularly in the case of sandy soils which gain additional strength through densification. This radial displacement of soil around the pile shaft contributes to the high capacity obtained for DD piles. The primary goal of this research is to investigate the use of screw piles within a multi-office execution strategy for the execution of capital projects in the Engineering, Procurement, and Construction (EPC) Industry. This thesis aims to investigate advantages / disadvantages and the understanding of effective utilization through identifying and ranking the driving factors for using distributed teams, challenges, origin, current status, future trends, and success / failure factors of screw piles.

Table of Content

CHAPTER 1. INTRODUCTION6

Background6

History of Screw Piles9

CHAPTER 2: SCREW PILE DESIGN12

Behavior of Single Pile Under Vertical Compresslve Loading13

Ultimate Pile Point Resistance14

The Tenaghi Bearing Capacity Equation15

Skernpton and Meyerhof s Bearing Capacity Theory17

Other Bearing Capacity Theory18

Shaft Skin Friction Capacity19

CHAPTER 3: HOW SCREW PILE BEHAVES IN THE GROUND22

Theories of Uplift Resistance for Anchors in Sand22

CHAPTER 4: INSTALLATION OF EQUIPMENT28

Installation Techniques of Different Screw Piles28

APGD Pile28

Atlas Pile29

De Waal Pile30

Fundex Piles31

Oliver Piles32

Omega Piles33

SVB Piles34

SVV Piles35

CHAPTER 4: INTERVIEW ANALYSIS37

Interview development37

Data Collection and Survey Results38

Ranking of Driving Factors40

Summary of Survey Responses40

Interview Results52

Screw piles Issue Examples from Interviews52

Commercial alignment52

Basic measurement setup53

Redesign (cultural)53

Seamless deliverable53

Summary53

CHAPTER 5: CASE STUDY PROJECT55

Strategic Evolution of Engineering Services Utilization: Introduction55

GCSES: Getting Started56

Success Strategies58

FEL 1: Business Planning Process58

FEL 2: Facilities Planning Process58

FEL 3: Project Planning Process59

Offshore Engineering Office ...