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在各类工程基础的施工排水中,最困难的是沙质基础排水.特别是粒径在0.05～0.25毫米的细沙基础排水更是困难.因为这种基础流沙较普遍,在排水过程中,水从地下渗出,水推沙走,有的水沙各半,有的沙比水多,这种流沙很快就会把排水沟湮没,把抽水机的底阀埋掉,使水抽不上来,待把底阀挖出拉上,清去泥沙,水又上来了,这样给排水工作带来许多麻烦,而且排水无保证,对基础开挖、施工影响较大,特别对于那些要求高的基础施工,更是难于保证质量.
In all types of construction based on the construction of drainage, the most difficult is the sandy foundation drainage.Especially the particle size of 0.05 to 0.25 mm of fine sand foundation drainage is more difficult.Because this basis, quicksand is more common in the drainage process, Water leaking from the ground, the water pushed the sand to go, and some half of the water and sediment, and some sand more than water, this quicksand will drain annihilation, the bottom valve to bury the pump so that water can not pump up , Until the end of the valve dug up, clear the sediment, the water is coming up, so that the drainage work to bring a lot of trouble, and no guarantee of drainage, the foundation excavation, the construction of a greater impact, especially for those demanding Basic construction, it is difficult to guarantee the quality.