排水管道闭水试验恒压时间一般是多少?

2025-03-23 23:54:35
推荐回答(3个)
回答(1):

24小时
9.3 无压管道的闭水试验
9.3.1 闭水试验法应按设计要求和试验方案进行。
9.3.2 试验管段应按井距分隔,抽样选取,带井试验。
9.3.3 无压管道闭水试验时,试验管段应符合下列规定:
1 管道及检查井外观质量已验收合格;
2 管道未回填土且沟槽内无积水;
3 全部预留孔应封堵,不得渗水;
4 管道两端堵板承载力经核算应大于水压力的合力;除预留进出水管外,应封堵坚固,不得渗水;
5 顶管施工,其注浆孔封堵且管口按设计要求处理完毕,地下水位于管底以下。
9.3.4 管道闭水试验应符合下列规定:
1 试验段上游设计水头不超过管顶内壁时,试验水头应以试验段上游管顶内壁加2m计;
2 试验段上游设计水头超过管顶内壁时,试验水头应以试验段上游设计水头加2m计;
3 计算出的试验水头小于10m,但已超过上游检查井井口时,试验水头应以上游检查井井口高度为准;
4 管道闭水试验应按本规范附录D(闭水法试验)进行。
9.3.5 管道闭水试验时,应进行外观检查,不得有漏水现象,且符合下列规定时,管道闭水试验为合格:
1 实测渗水量小于或等于表9.3.5规定的允许渗水量;
表9.3.5 无压管道闭水试验允许渗水量
管材 管道内径Di(mm) 允许渗水量
[m3/(24h•km)] 管道内径Di(mm) 允许渗水量
[m3/(24h•km)]
钢筋混凝土管 200 17.60 1200 43.30
300 21.62 1300 45,00
400 25.00 1400 46.70
500 27.95 1500 48.40
600 30.60 1600 50.00
700 33.00 1700 51.50
800 35.35 1800 53.00
900 37.50 1900 54.48
1000 39.52 2000 55.90
1100 41.45
2 管道内径大于表9.3.5规定时,实测渗水量应小于或等于按下式计算的允许渗水量;
q=1.25√Di (9.3.5-1)
3 异型截面管道的允许渗水量可按周长折算为圆形管道计;
4 化学建材管道的实测渗水量应小于或等于按下式计算的允许渗水量。
q=0.0046Di (9.3.5-2)
式中 q——允许渗水量(m3/24h•km);
Di——管道内径(mm)。
9.3.6 管道内径大于700mm时,可按管道井段数量抽样选取1/3进行试验;试验不合格时,抽样井段数量应在原抽样基础上加倍进行试验。
9.3.7 不开槽施工的内径大于或等于1500mm钢筋混凝土管道,设计无要求且地下水位高于管道顶部时,可采用内渗法测渗水量;渗漏水量测方法按附录F的规定进行,符合下列规定时,则管道抗渗性能满足要求,不必再进行闭水试验:
1 管壁不得有线流、滴漏现象;
2 对有水珠、渗水部位应进行抗渗处理;
3 管道内渗水量允许值q≤2[L/(m2•d)]。

回答(2):

排水管道闭水试验恒压时间一般是24小时。
闭水实验(closed water test)也叫蓄水试验,要放满水,水要有足够容积。蓄水试验的蓄水深度应不小于20mm,蓄水高度一般为30-100mm,蓄水时间为24小时,水面无明显下降为合格。一般在屋面,卫生间或有防水要求的房间做此试验,蓄水试验的前期每1小时应到楼下检查一次,后期每2—3小时到楼下检查一次。若发现漏水情况,应立即停止蓄水试验,重新进行防水层完善处理,处理合格后再进行蓄水试验。

回答(3):

24小时及以上

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