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By M J Tomlinson

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25m drop of the 10 tonne ram. 6m penetration. The pile was then cleaned out and plugged with concrete but failed under a test load of 6300kN. It was evident from the driving records that the plain piles showed little evidence of developing base resistance by plugging and would have had to be driven much deeper to obtain the required bearing capacity. 18b. 19. The final resistance was approaching refusal at 194 blows/200mm at 19m below sea bed. The winged pile did not fail under the test load of 6300kN.

The ordinary reinforced concrete pile is likely to be preferred for a project requiring a fairly small number of piles, where the cost of establishing a production line for prestressing work on site is not justifiable and where the site is too far from an established factory to allow the economical transportation of prestressed units from the factory to the site. , in Holland and Sweden, the ordinary reinforced concrete pile is preferred to the prestressed design in almost all circumstances. Precast concrete piles in ordinary reinforced concrete are usually square or hexagonal and of solid cross-section for units of short or moderate length, but for saving weight long piles are usually manufactured with a hollow interior in hexagonal, octagonal or circular sections.

Solid rectangular piles: 4 bars not less than 14mm diameter placed in corners. 5%, max 8% of cross-section. At least 6 bars for round and octagonal piles. At least 4 bars for square piles Spiral or not less than 6mm diameter SBS-S23:6 (1968) Unstressed: Min diameter 12mm, max diameter 25mm. 5b. 6. Prestressed concrete piles have certain advantages over those of ordinary reinforced concrete. Their principal advantage is in their higher strength to weight ratio, enabling long slender units to be lifted and driven.

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