Phansi komgodi wokumba - ingasetshenziselwa ukwakhiwa kwedolobha, ujantshi, umgwaqo omkhulu, umfula, amanzi kanye nobunjiniyela bukagesi ukubhola imbobo ye-anchor yembobo, imbobo yehange, imbobo yokuqhuma, ukwakhiwa kokumba imbobo ye-grouting.1, umshini wokumba ongaphansi kwamanzi usebenzisa injini ngokusebenza okuphezulu ...
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