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[单选题]
轻型井点管路系统包括滤管、井点管、弯连管、总管,其中遮管的直径和长度为()
A.Φ38~50mm,1.0~1.5m
B.Φ38~50mm,5~7m
C.Φ38~50mm,0.2~0.3m
D.Φ75~100mm,4.0m
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A、Φ38~50mm,1.0~1.5m
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A.Φ38~50mm,1.0~1.5m
B.Φ38~50mm,5~7m
C.Φ38~50mm,0.2~0.3m
D.Φ75~100mm,4.0m
A、Φ38~50mm,1.0~1.5m
A.100mm,0.1m
B.100mm,0.3m
C.200mm,0.5m
D.300mm,0.5m
某工程基坑底的平面尺寸为40.5m×16.5m,底面标高-7.0m(地面标高为±0.500)。已知地下水位面为-3m,土层渗透系数K=18m/d,-14m以下为不透水层,基坑边坡需为1:0.5。拟用射流泵轻型井点降水,其井管长度为6m,滤管长度待定,管径为38mm;总管直径100mm,每节长4m,与井点管接口的间距为1m。试进行降水设计。
A.井孔冲成后应灌填砂滤料以防止塌孔
B.当有土方机械频繁进入基坑时,井点宜采用环形布置
C.弯联管南方地区宜采用橡胶软管
D.槽宽>6m,且降水深度超过5m时不适宜采用单排井点
E.为了更好地集中排水,井点管应布置在地下水下游一侧