取(qu)(qu)水(shui)(shui)管(guan)(guan)(guan)道(dao)水(shui)(shui)下(xia)(xia)(xia)安裝采用浮沉(chen)法施工(gong)(gong),具(ju)體施工(gong)(gong)工(gong)(gong)藝為(wei):取(qu)(qu)水(shui)(shui)管(guan)(guan)(guan)道(dao)浮運到位、準(zhun)(zhun)確后(hou)灌水(shui)(shui)下(xia)(xia)(xia)沉(chen)、水(shui)(shui)下(xia)(xia)(xia)管(guan)(guan)(guan)位調整、水(shui)(shui)下(xia)(xia)(xia)抱箍安裝、法蘭螺(luo)栓穿插緊固。取(qu)(qu)水(shui)(shui)管(guan)(guan)(guan)道(dao)溜放下(xia)(xia)(xia)水(shui)(shui)后(hou)即用船準(zhun)(zhun)確于(yu)管(guan)(guan)(guan)槽軸(zhou)線水(shui)(shui)面,然后(hou)進行(xing)管(guan)(guan)(guan)道(dao)充水(shui)(shui)下(xia)(xia)(xia)沉(chen)工(gong)(gong)作。此時用一(yi)臺每小時供水(shui)(shui)量100~200立方米的潛(qian)水(shui)(shui)泵于(yu)北(bei)向(xiang)管(guan)(guan)(guan)端(duan)堵(du)板注(zhu)水(shui)(shui)閘閥處注(zhu)水(shui)(shui),并把南(nan)向(xiang)管(guan)(guan)(guan)端(duan)封板處的排氣閥門打開,屆時,隨(sui)著(zhu)注(zhu)入管(guan)(guan)(guan)道(dao)水(shui)(shui)量增加,管(guan)(guan)(guan)道(dao)由南(nan)向(xiang)一(yi)端(duan)先下(xia)(xia)(xia)沉(chen)至管(guan)(guan)(guan)槽就(jiu)位,管(guan)(guan)(guan)內空氣由南(nan)向(xiang)一(yi)端(duan)排氣閥門排出(chu),管(guan)(guan)(guan)道(dao)由北(bei)向(xiang)一(yi)端(duan)至南(nan)向(xiang)一(yi)端(duan)逐步下(xia)(xia)(xia)沉(chen)直(zhi)至整管(guan)(guan)(guan)下(xia)(xia)(xia)沉(chen)就(jiu)位。
取水(shui)(shui)管(guan)(guan)下(xia)沉(chen)時(shi),潛水(shui)(shui)員(yuan)著裝(zhuang)待令,準備隨時(shi)下(xia)水(shui)(shui)進行管(guan)(guan)道下(xia)沉(chen)情況(kuang)檢查,如出現管(guan)(guan)道下(xia)沉(chen)偏(pian)差,應在北(bei)端堵板注(zhu)水(shui)(shui)處用空壓機向管(guan)(guan)內充氣,使管(guan)(guan)上(shang)浮,重新(xin)進行管(guan)(guan)道,確保(bao)取水(shui)(shui)管(guan)(guan)準確入槽。按照前述施工程序,將(jiang)相鄰兩根管(guan)(guan)道沉(chen)放到位后,就由潛水(shui)(shui)員(yuan)在水(shui)(shui)下(xia)安裝(zhuang)作業(ye),盡管在空(kong)氣(qi)(qi)中(zhong)已實施了大量的(de)研(yan)究,但僅部分(fen)成(cheng)果可應用于潛水(shui)員(yuan)使用和(he)靠近水(shui)下電(dian)動設(she)備(bei)時的(de)危險預防。空(kong)氣(qi)(qi)中(zhong)和(he)水(shui)下使用電(dian)動設(she)備(bei)具(ju)備(bei)著(zhu)兩個一般不相(xiang)同點(dian)。首先,空(kong)氣(qi)(qi)具(ju)有著(zhu)相(xiang)對較(jiao)強的(de)絕緣性,能保護人體避免電(dian)擊,除非他接觸了線路故障而成(cheng)為電(dian)路的(de)少部分(fen)。
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