Bolted nyob rau hauv-situ pawg qhia: bolted in-situ pawg yog ib hom ntawm drilling hauv-situ pawg nrog cov yam ntxwv ntawm kauv, nrog rau me ntsis / laum yeeb nkab / helical hniav thiab txuas yeeb nkab.
Bolted nyob rau hauv-situ pawg qhia: bolted in-situ pawg yog ib hom ntawm drilling hauv-situ pawg nrog cov yam ntxwv ntawm kauv, nrog rau me ntsis / laum yeeb nkab / helical hniav thiab txuas yeeb nkab.