縮徑鉆孔 的英文怎麼說
中文拼音 [suōjìngzhēnkǒng]
縮徑鉆孔
英文
tight hole-
Special thermowell is manufactured from drilled bar stock to withstand pressure morethan 6. 4mpa, together with convenience in installation for movable connector
特製套管帶活動連接頭,安裝方便,整體鉆孔縮徑式套管結構,耐壓6 . 4mpaHowever, there are many troubles in constructing in gravel, such as drilling difficult, hole collapsing and drill losing, which will lead to enlarge or shrink pile ' s diameter, form fault pile, delay the time, increase the use of material and higher the investment
但灌注樁在卵石層中施工或穿越卵石層會遇到鉆進困難、孔壁易塌、掉鉆卡鉆等諸多問題,造成擴徑、縮徑、斷樁等病害,使工期延長,材料用量增加,費用增高。
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