The ground stratum is quite complex, with silt layer and fine sand layer mixed, so the construction is difficult to be carried out and the requirement of pit support is strict.
基坑所处地层十分复杂，有较厚的淤泥层和细砂层，基坑支护要求高，施工难度大。
Sewage flows through coarse bar screen and into inlet pump station drop pit, then is lifted to fine bar screen by drowned pumps.
经过粗格栅污水汇入进水泵站集水坑中，再由潜水泵提升至细格栅进水管。
When the soil is fine, throw earth on the groove side (or material) 0.8m away from the pit (groove) edge with height more than 1m.
当土质良好时，抛于槽边的土方（或材料），应距槽（沟）边缘0．8m以外，高度不宜超过1m。
When the soil is fine, throw earth on the groove side (or material) 0.8m away from the pit (groove) edge with height more than 1m.
当土质良好时，抛于槽边的土方（或材料），应距槽（沟）边缘0．8m以外，高度不宜超过1m。
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