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Micropile
Micropile and Minipile systems are excellent for underpinning, and are constructed using geotechnical techniques and conventional materials. Piles (micro or mini) are preferred supports to stabilize buildings, bridges, highways, towers, other man-made structures, etc. The names minipile or micropile depict their sizes, i.e., 6"-12" mini, 2"-5" micro. Minipile installations are installed by using drilling and grouting technology. Micro and mini installations can also penetrate to hundreds of feet in depth; each of the piles can support hundreds of tons. |
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A micropile may be reinforced with large-diameter, threaded bar (75K) to attain the correct design load
capacity. Support piles (both mini and micro) are often installed rather than "H" piles because of overhead physical constraints. Construction can be in close quarters under restricted headroom by using simultaneous insertion of casing and drill rod, short
casing lengths. |
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Micropile - Minipile Setup Sequence:
Drilled
in bedrock, a minipile is bonded to the rock socket for load transfer to the
wall. |
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Minipile is advanced as piles are drilled into bedrock. |
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Drill pipe is removed, which leaves the micro pile setting in the rock socket. |
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Reinforcement threaded bars lowered into micropile casings. |
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Grout pumped or pressure feed into mini piles casings, from bottom up. |
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The
minipile is lifted to mouth of rock socket to allow bonding to pile. |
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Micro piles tops are cut to elevation then capped to adapt foundation rebar. |
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Load
test minipile or micropile, eng. spec., to prove the load design. |
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Animation |
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