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DE2634709A1
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Vertical drain hole with filter in ground - is lined with filter mat on boring and filled with granules
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DE2626762A1
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Concrete pile with larger dia. base hole - with pile drawn up as base concrete is poured and then driven into place
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FR2324809A1
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Self sinking axial passage foundation pile - has drill bit rotated by hollow shaft passed through pile without transmitting rotation to pile
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NL7510980A
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Prodn. of precast concrete pile foundations - using auger to predrill hole for hollow pile passing flushing fluid and filled in situ
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US4027490A
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Self-sinking, axial passage foundation pile and method
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CA1024757A
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Self-sinking, axial passage foundation pile and method
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