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Pile design and construction practice by M J Tomlinson

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By M J Tomlinson

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5, 5 and 12m in 285mm square sections suitable for working loads of up to 800kN; the Europile 500 which is a 272×290mm triangular section in unjointed lengths up to 14m for working loads up to 707kN; and the Europile 750 which is a 275mm square section in unjointed lengths up to 15m for working loads up to 1080kN. 6a). 10 * Safe working load is dependent on length of pile and soil properties. of up to 206000mm2 are manufactured in Sweden by AB Scanpile. † Units Page 24 Fig. 13 ‘Hercules’ jointed precast concrete pile with ‘Oslo’ rock point segmental pile which consists of 280mm cylindrical sections 1m long with a 70mm central hole is suitable for working loads of up to 300kN.

Cast-in-place concrete piles are not so resistant to aggressive substances because of difficulties in ensuring complete compaction of the concrete, but protection can be provided against attack by placing the concrete in permanent linings of coated light-gauge metal or plastics. Steel piles can have a long life in ordinary soil conditions if they are completely embedded in undisturbed soil but the portions of a pile exposed to sea water or to disturbed soil must be protected against corrosion by cathodic means if a long life is required.

Alternatively drainage holes can be provided to prevent water accumulating in the hollow interior. 4. , piles driven through soft clays into mediumdense or dense sands, economies in concrete and reductions in weight for handling can be achieved by providing the piles with an enlarged toe. 5 times the shaft width with a length equal to or greater than the width of the enlargement. 4 Working loads and maximum lengths for ordinary precast concrete piles of square section Pile size (mm square) Range of working loads (kN) Maximum length (m) 250 200–300 12 300 300–450 15 350 350–600 18 400 450–750 21 450 500–900 25 BS 8004 requires that piles should be designed to withstand the loads or stresses and to meet other serviceability requirements during handling, pitching, driving and in service in accordance with the current standard Code of Practice for the structural use of concrete.

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