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南(nan)水(shui)(shui)北調(diao)受水(shui)(shui)區鶴壁(bi)供水(shui)(shui)配套(tao)工程浚縣段需下(xia)穿S219、S215省道(dao)，為保證施工期間不影響(xiang)交通先(xian)施作(zuo)Φ245管(guan)(guan)(guan)幕(mu)進行超(chao)前支護。管(guan)(guan)(guan)幕(mu)設計為(wei)門型，管(guan)(guan)(guan)間距500mm，施工(gong)長度分別為(wei)30米、50米。

隧道所處地層為粘土(tu)及粉質粘土(tu)層，采用新開發的螺(luo)旋出(chu)土頂管管幕施(shi)工方法和設(she)備進(jin)行施(shi)工螺旋出(chu)土頂管鉆機(ji)為動力(li)頭式(shi)，輸出(chu)旋轉動力(li)。動力(li)頭前(qian)端安裝有(you)螺旋鉆(zhan)桿及螺旋鉆(zhan)頭，待鋪設的Φ245鋼(gang)管在螺旋鉆(zhan)桿(gan)之(zhi)外。鋼管(guan)(guan)與螺旋鉆(zhan)桿(gan)之(zhi)間形成(cheng)出土空間，定長配套，可接尺。頂(ding)(ding)進(jin)(jin)油缸在動(dong)力頭(tou)(tou)后端階段頂(ding)(ding)進(jin)(jin)，推動(dong)動(dong)力頭(tou)(tou)實(shi)現給進(jin)(jin)。隨著螺旋出土頂(ding)(ding)管(guan)(guan)鉆(zhan)機的轉動(dong)，螺旋鉆(zhan)桿(gan)向(xiang)切削鉆(zhan)頭(tou)(tou)傳遞鉆(zhan)壓和扭矩(ju)來切削土屑，并將土屑排到工作(zuo)坑。頂(ding)(ding)進(jin)(jin)油缸向(xiang)前頂(ding)(ding)進(jin)(jin)管(guan)(guan)道(dao)，邊頂(ding)(ding)進(jin)(jin)、邊切削、邊輸送，將管(guan)(guan)道(dao)逐(zhu)段向(xiang)前鋪設。

該工(gong)(gong)法(fa)的(de)成(cheng)(cheng)功應(ying)用(yong)，大大提高了(le)管幕支護的(de)施工(gong)(gong)效(xiao)果(guo)，避(bi)免了(le)水(shui)鉆(zhan)施工(gong)(gong)對地層的(de)擾(rao)動影響，也(ye)凈(jing)化(hua)了(le)施工(gong)(gong)環境。施工(gong)(gong)現場(chang)順利(li)完成(cheng)(cheng)了(le)管幕鎖扣聯接頂進，為(wei)國內管幕施工(gong)(gong)提供了(le)新(xin)的(de)方法(fa)和實踐經驗。

附(fu)圖：

頂部橫(heng)排管幕施工

帶鎖扣管幕施工

側部豎排管(guan)幕施工(gong)