水(shui)(shui)下(xia)(xia)切(qie)(qie)割拆除與(yu)固定管(guan)(guan)可(ke)折(zhe)疊(die)密封(feng)配合，當(dang)船(chuan)行馳至(zhi)橋(qiao)(qiao)墩(dun)或較窄(zhai)河(he)面(mian)時(shi)，可(ke)以(yi)將(jiang)噴(pen)水(shui)(shui)管(guan)(guan)的(de)(de)活動(dong)(dong)(dong)(dong)管(guan)(guan)折(zhe)疊(die)起來以(yi)方便行馳，而固定管(guan)(guan)上(shang)(shang)的(de)(de)噴(pen)水(shui)(shui)槍繼續噴(pen)射水(shui)(shui)流(liu)。在較寬的(de)(de)河(he)面(mian)上(shang)(shang)，展開活動(dong)(dong)(dong)(dong)管(guan)(guan)，使(shi)活動(dong)(dong)(dong)(dong)管(guan)(guan)和(he)固定管(guan)(guan)上(shang)(shang)的(de)(de)噴(pen)水(shui)(shui)槍同(tong)時(shi)噴(pen)水(shui)(shui)清(qing)理淤(yu)泥。避(bi)免了(le)橋(qiao)(qiao)墩(dun)和(he)船(chuan)體尺寸(cun)限(xian)制(zhi)噴(pen)水(shui)(shui)管(guan)(guan)長(chang)度(du)，操作靈(ling)活，大(da)大(da)提(ti)高了(le)水(shui)(shui)下(xia)(xia)切(qie)(qie)割公司使(shi)用(yong)效率和(he)疏浚效果(guo)。 同(tong)時(shi)在活動(dong)(dong)(dong)(dong)管(guan)(guan)和(he)固定管(guan)(guan)上(shang)(shang)噴(pen)水(shui)(shui)槍上(shang)(shang)噴(pen)水(shui)(shui)清(qing)理淤(yu)泥。將(jiang)火(huo)焰與(yu)水(shui)(shui)分開，既保證了(le)火(huo)焰燃燒的(de)(de)穩定性，又(you)提(ti)高了(le)火(huo)焰的(de)(de)預(yu)熱效果(guo)，增加了(le)從噴(pen)嘴到(dao)待切(qie)(qie)割工件之間距離(li)的(de)(de)變化范(fan)圍，便于(yu)(yu)操作。 水(shui)(shui)下(xia)(xia)機械切(qie)(qie)割機一般(ban)有(you)液(ye)壓驅動(dong)(dong)(dong)(dong)、氣壓驅動(dong)(dong)(dong)(dong)及(ji)電(dian)動(dong)(dong)(dong)(dong)驅動(dong)(dong)(dong)(dong)三種。液(ye)壓驅動(dong)(dong)(dong)(dong)的(de)(de)切(qie)(qie)割機在同(tong)一液(ye)壓下(xia)(xia)進行水(shui)(shui)下(xia)(xia)切(qie)(qie)割和(he)拆卸(xie)。隨著水(shui)(shui)深的(de)(de)增加，切(qie)(qie)割機的(de)(de)功率相應降低，即驅動(dong)(dong)(dong)(dong)功率受水(shui)(shui)深的(de)(de)限(xian)制(zhi)。氣壓驅動(dong)(dong)(dong)(dong)類(lei)似于(yu)(yu)液(ye)壓驅動(dong)(dong)(dong)(dong)的(de)(de)切(qie)(qie)割機。如果(guo)排氣管(guan)(guan)與(yu)大(da)氣相連(lian)，可(ke)以(yi)反沖壓，提(ti)高切(qie)(qie)割效率。

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