隧道防排水系统如何施工

1）土(tu)工布(bu)(bu)铺(pu)设首先(xian)用(yong)作业台车将单(dan)幅无(wu)(wu)纺布(bu)(bu)固(gu)定到预定位置，然后用(yong)长(zhang)度(du)3.5cm射钉(ding)将无(wu)(wu)纺布(bu)(bu)固(gu)定在喷射混(hun)凝土(tu)上。专用(yong)热熔衬垫及射钉(ding)按梅花型布(bu)(bu)置，拱部间距50cm,边墙80cm。无(wu)(wu)纺布(bu)(bu)与(yu)初支喷混(hun)凝土(tu)表面密贴，铺(pu)设平(ping)顺、无(wu)(wu)隆起(qi)、无(wu)(wu)褶(zhe)皱。无(wu)(wu)纺布(bu)(bu)搭接宽(kuan)度(du)为(wei)50mm。

2）排(pai)(pai)水盲(mang)(mang)管(guan)安装环向(xiang)排(pai)(pai)水盲(mang)(mang)管(guan)间距(ju)(ju)8m，采(cai)用(yong)∅50波(bo)纹(wen)管(guan)，外裹无纺布，采(cai)用(yong)铆(mao)钉(ding)加(jia)(jia)压(ya)条(tiao)固定，沿墙脚处直接(jie)伸(shen)入(ru)隧道纵向(xiang)排(pai)(pai)水管(guan)内，连接(jie)方式采(cai)用(yong)三通方式连接(jie)。根据地下水发育(yu)情况，局部(bu)渗水严重段应加(jia)(jia)密；盲(mang)(mang)管(guan)外包土工(gong)布采(cai)用(yong)铆(mao)钉(ding)加(jia)(jia)压(ya)条(tiao)沿隧道环向(xiang)固定在初(chu)支上，固定间距(ju)(ju)0.5～1m。纵向(xiang)盲(mang)(mang)管(guan)低于侧沟盖板顶面50cm位置(zhi)设(she)置(zhi)，纵向(xiang)盲(mang)(mang)管(guan)采(cai)用(yong)铆(mao)钉(ding)加(jia)(jia)压(ya)条(tiao)间距(ju)(ju)50cm进(jin)行固定。

3）防(fang)(fang)(fang)水(shui)板(ban)(ban)(ban)铺(pu)(pu)设利用作业台车将防(fang)(fang)(fang)水(shui)板(ban)(ban)(ban)固定到预定位置,然后用手动电热熔(rong)接器加热,使防(fang)(fang)(fang)水(shui)板(ban)(ban)(ban)焊接在固定土工(gong)布的(de)专用热熔(rong)衬垫上(shang)。防(fang)(fang)(fang)水(shui)板(ban)(ban)(ban)搭接采用双缝爬进(jin)行焊接，搭接长度15cm、焊缝宽度1.5cm，经现(xian)场试验(yan)，电磁焊机温度250℃、焊接时(shi)间(jian)每处5s。防(fang)(fang)(fang)水(shui)板(ban)(ban)(ban)铺(pu)(pu)设要松紧适(shi)度，防(fang)(fang)(fang)水(shui)板(ban)(ban)(ban)铺(pu)(pu)设从拱部向两侧边(bian)墙进(jin)行，下部防(fang)(fang)(fang)水(shui)板(ban)(ban)(ban)应压住上(shang)部防(fang)(fang)(fang)水(shui)板(ban)(ban)(ban)，铺(pu)(pu)设好的(de)防(fang)(fang)(fang)水(shui)板(ban)(ban)(ban)应与基面凹凸起伏(fu)一致(zhi)，保持自然、平(ping)整、伏(fu)贴。要防(fang)(fang)(fang)止(zhi)过紧撕(si)裂、浇筑和振(zhen)捣混凝土时(shi)防(fang)(fang)(fang)水(shui)板(ban)(ban)(ban)脱(tuo)落，以(yi)保证(zheng)防(fang)(fang)(fang)水(shui)质量(liang)；要避免松动鼓包导致(zhi)人为储水(shui)或(huo)侵(qin)入(ru)衬砌、影响(xiang)二(er)衬尺寸等情况。