Foundation underpinning by means of piles

Jacked piles are more economical than bored—injection piles both in labor and material costs. Unlike bored—injection piles, they are installed with prestressing. It is advisable to place the jacked plies at distances of 5 m from each other, and to use reinforced concrete for the wall beams. - https://link.springer.com/article/10.1007/BF02305700

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The technology of constructing bored injection piles for the foundation - https://goo.gl/Q8K9rw

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