By John Woodward
The fourth version of this recognized ebook is absolutely revised and up-dated. It offers comprehensively with each point of layout and development of all kinds of piled beginning. A key function of this e-book is the massive variety of labored examples, lots of that are according to genuine difficulties encountered in perform.
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Extra info for Pile Design and Construction Practice
For economy in materials, prestressed concrete piles should be made with designed concrete mixes with a minimum 28-day works cube strength of 40N/mm2. 6 that some codes specify a maximum load which can be applied to a precast concrete pile of any dimensions. As in the case of timber piles this limitation is to prevent unseen damage to piles which may be over-driven to achieve an arbitrary set given by a dynamic pile-driving formula. Concrete made with ordinary Portland cement is suitable for all normal exposure conditions but sulphate-resisting cement may be needed for aggressive ground conditions sa discussed in Chapter 10.
Reinforcement may be needed in any case to resist bending stresses due to lateral loads or tensile stresses from uplift loads. Where high-capacity piles are to be driven to a hard stratum savings in the overall quantity of concrete compared with cast-in-situ piles can be achieved since higher working stresses can be used. Where piles are to be driven in sulphate-bearing ground or into aggressive industrial waste materials, the provision of sound high-quality dense concrete is ensured. The problem of varying the length of the pile can be overcome by adopting a jointed type.
In the spiral welding process the coiled steel strip is continuously unwound and spirally bent cold into the tubular form. The joints are then welded from both sides. 8. In the longitudinally-welding process a steel plate is cut and bevelled to the required dimensions then pressed or rolled into tubular form and welded along the linear joints. The spiral method has the advantage that a number of different sizes can be formed on the same machine, but there is a limitation that plate thicknesses more than about 25mm cannot be handled.