長螺旋動力頭

（1）鉆(zhan)(zhan)機對位(wei)鉆(zhan)(zhan)機就位(wei)時(shi)，液壓(ya)支(zhi)腿(tui)要落在實處(chu)，松軟處(chu)可用(yong)枕木等物墊(dian)塞，利用(yong)液壓(ya)支(zhi)腿(tui)使鉆(zhan)(zhan)機水平(ping)并調整鉆(zhan)(zhan)機立(li)柱(zhu)與(yu)水平(ping)面垂(chui)直，垂(chui)直偏差不大于1%，對位(wei)偏差不超過20mm。

（2）鉆進成孔

鉆(zhan)(zhan)(zhan)(zhan)(zhan)進(jin)成孔中，對鉆(zhan)(zhan)(zhan)(zhan)(zhan)壓、轉速和鉆(zhan)(zhan)(zhan)(zhan)(zhan)進(jin)速度要根據地質變化與(yu)動(dong)力頭工作電(dian)流(liu)(liu)顯示值(zhi)(zhi)進(jin)行合(he)理調整(zheng)，正常(chang)鉆(zhan)(zhan)(zhan)(zhan)(zhan)進(jin)的(de)電(dian)流(liu)(liu)值(zhi)(zhi)一般為100A左右(you)。當電(dian)流(liu)(liu)值(zhi)(zhi)大于140A的(de)額定值(zhi)(zhi)時(shi)，應迅速進(jin)行空(kong)鉆(zhan)(zhan)(zhan)(zhan)(zhan)，使緊抱鉆(zhan)(zhan)(zhan)(zhan)(zhan)桿葉片(pian)上的(de)土塊(kuai)甩出(chu)，待電(dian)流(liu)(liu)值(zhi)(zhi)降(jiang)到(dao)正常(chang)范圍后方(fang)可繼續(xu)鉆(zhan)(zhan)(zhan)(zhan)(zhan)進(jin)，鉆(zhan)(zhan)(zhan)(zhan)(zhan)進(jin)時(shi)應采用間歇鉆(zhan)(zhan)(zhan)(zhan)(zhan)進(jin)方(fang)法(即(ji)鉆(zhan)(zhan)(zhan)(zhan)(zhan)進(jin)→空(kong)鉆(zhan)(zhan)(zhan)(zhan)(zhan)→鉆(zhan)(zhan)(zhan)(zhan)(zhan)進(jin))，以利(li)于被切削巖土及時(shi)排出(chu)地面。當鉆(zhan)(zhan)(zhan)(zhan)(zhan)至設(she)計深度后空(kong)轉30-60s，待電(dian)流(liu)(liu)穩(wen)定后停(ting)鉆(zhan)(zhan)(zhan)(zhan)(zhan)并發出(chu)信號，為泵送混凝土做(zuo)好(hao)準備

（3）泵壓混凝土與提升(sheng)鉆桿

混(hun)凝(ning)土(tu)(tu)可采用現場攪拌混(hun)凝(ning)土(tu)(tu)，混(hun)凝(ning)土(tu)(tu)坍落度(du)一般為(wei)150～180mm，石子粒徑通(tong)常為(wei)5～20mm，摻高(gao)效減水(shui)劑或(huo)泵送(song)(song)劑，泵送(song)(song)混(hun)凝(ning)土(tu)(tu)時(shi)(shi)，司泵工(gong)與司鉆(zhan)工(gong)要隨時(shi)(shi)聯系(xi)，保(bao)證(zheng)輸(shu)送(song)(song)、停止輸(shu)送(song)(song)混(hun)凝(ning)土(tu)(tu)與提(ti)升(sheng)(sheng)、停止提(ti)升(sheng)(sheng)鉆(zhan)桿的工(gong)作密切配合(he)。鉆(zhan)桿提(ti)升(sheng)(sheng)要求為(wei)提(ti)升(sheng)(sheng)速度(du)1.5～3.5m／min，鉆(zhan)頭(tou)始終(zhong)埋(mai)在混(hun)凝(ning)土(tu)(tu)下面1.0m深處；泵送(song)(song)混(hun)凝(ning)土(tu)(tu)要求為(wei)：泵工(gong)作壓(ya)力值一般控制(zhi)在3.0-4.0MPa，并(bing)保(bao)證(zheng)提(ti)升(sheng)(sheng)鉆(zhan)頭(tou)時(shi)(shi)要帶壓(ya)，達到(dao)樁頂標高(gao)后超灌500mm。

（4）鋼筋籠制作安裝 氣動架柱式鉆機

鋼(gang)筋籠(long)加工質量應符合設計與規范要求(qiu)。在泵(beng)送混凝土結束后應迅速將鉆具移位，清(qing)理孔(kong)口，借助(zhu)副卷揚(yang)機吊籠(long)入(ru)孔(kong)，并(bing)將籠(long)體振入(ru)預(yu)定深度。僅供參考(kao)。