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唐山市修筑某桥开挖基槽时,曾遇到较严重的流砂。在基槽四壁,有大量的粉砂及地下水向外涌出,基底随挖随长,甚至挖的不如长的快。虽然我们采取了二些简单方法,但效果都不大。基槽四壁由于流砂过多,以至向壁内掏空约2公只左右,使工程受到很大影响,同时也直接威胁着邻近房屋的安全。在这种情况下,我们采取了用以下方法,得到良好的效果,现在介绍如下: 1.将原挖的基槽自中线向外加宽约10—15公分,并将此加宽的土壤部分挖去,此时,基槽的尺寸较基础实在的尺寸长宽约大10—20公分左右。
Tangshan City to build a bridge excavation base groove, had encountered more serious sand. In the base groove wall, a large number of silt and groundwater gushed out, the base with digging long, or digging as fast as the fast. Although we have taken some simple methods, they are not effective enough. Due to excessive flow of sand on the four sides of the base groove, about 2 kilometers of concrete are hollowed out to the wall, which greatly affects the project and directly threatens the safety of neighboring houses. In this case, we have taken the following method to get good results. Now we introduce the following: 1. Widen the base trench of the original excavation about 10-15 cm outward from the midline, and put this widened soil part Digging, at this time, the size of the base groove than the basic size is about 10-20 cm long and wide.