论文部分内容阅读
一上海市采用就地灌樁的一些問題 1.閔行电厂基础。用的是单打的就地灌注桩,桩距为1.35米,200号混凝土、深度約19～20米。錘重3.5吨,冲程0.60～1米,最后貫入,每击約3毫米左右。設計荷重每桩約30余吨。土壤情况:地面为比较好的耕土,厚2米左右,下面直至19米左右都是淤泥質,压縮性高,流动性大。地下水离地面約0.50米。打桩20余根时即发現有隆起現象,仍继续施工,并一面在做汽輪机基础。已打桩部份土壤逐漸隆起,面积很大,高达1米有余。經試压不到10吨,桩即直綫下沉。开挖至6米处发現一授断裂,多至五节,中隔砂土。600根桩不断裂的几乎沒有。水平方向的位移,多的有40厘米,亦有20余厘米的。上节与下节都不在同一垂直綫上。
A problem in Shanghai where in-situ irrigation is used The single-use cast-in-situ pile was used. The pile spacing was 1.35 meters, and the 200-degree concrete was about 19 to 20 meters deep. Hammer weight 3.5 tons, stroke 0.60 to 1 meters, the final penetration, about 3 mm per strike. The design load is about 30 tons per pile. Soil condition: The ground is a good ploughing soil, about 2 meters thick, and up to about 19 meters below all are muddy, with high compressibility and high fluidity. Groundwater is about 0.50 meters from the ground. When more than 20 piles were piled up, a bulge phenomenon was found and the construction was still continued, and the steam turbine was used as a foundation. Some of the soil that has been piled up has been gradually swelled. It has a large area and is more than one meter high. After testing less than 10 tons, the pile sinks straight. A fracture was found at the excavation to 6 meters and there were as many as five sections. 600 piles do not break almost. The horizontal displacement is more than 40 cm and there are more than 20 cm. The upper and lower sections are not on the same vertical line.