Steel Designers Manual - TheBestFriend.org

This material is copyright - all rights reserved. Reproduced under licence from The Steel Construction Institute on 12/2/2007
To buy a hardcopy version of this document call 01344 872775 or go to http://shop.steelbiz.org/
Steel Designers' Manual - 6th Edition (2003)
886 Steel piles
29.2.2 Benefits
Benefits of the use of steel sheet piling include:
• Construction is faster than that for reinforced concrete walls
• Are a narrow form of construction, which can be installed close up to the boundary
of the site, maximizing usable building space
• Suitable for all soil types
• No requirement to excavate for wall foundations
• No disturbance of existing ground or arisings unlike that for bored concrete piling
• The steel components are factory quality as opposed to site quality
• High ductility that can reduce bending stresses and soil reactions
• Can easily be made aesthetically pleasing
• Can be placed in advance of other works
• Immediate load-carrying capacity
• Forms a ‘curtain walling’ to contain the working site
• They are a ‘sustainable’ product as they can be extracted easily and minimize
waste
29.2.3 Types of piles
In the UK, two profiles, designated as U and Z, are available. U profiles are also
commonly referred to as Larssen sections and Z profiles as Frodingham sections.
See Fig. 29.11. In addition, where the depth of excavation is small, trench sheet sections
may be used as alternatives to sheet piles.
The essential difference between these sections and ordinary structural beams is
their ability to interlock with each other to form a continuous membrane in the soil.
(Sections and their properties are included in Appendices.)
Steel sheet piling, including sections for box piles, is produced in accordance with
BS EN 10248, 25 the most typical grades being S270GP and S355GP with yield
strengths of 270 N/mm 2 and 355 N/mm 2 respectively. In addition, higher-strength
Larssen Frodingham
Fig. 29.11 Larssen and Frodingham sheet piles