切り杭[kirikui] stump
棒杭[bougui] stake
橋杭[hashigui] bridge pillar
焼け棒杭[yakebokui] charred stake
乱杭[rangui] palisade

乱杭歯[ranguiba] uneven teeth
支持杭[shijikou] bearing pile
杭周面摩擦力[kuishuumenmasatsuryoku] pile shaft friction
出る杭は打たれる[derukuihautareru] the nail that sticks out gets hammered in