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1986年第4季度,基建处接到两台设备基础的设计和施工任务。两台镗床是从国外引进的,对基础的精度要求较高。除基础本身要有足够的刚度,对地基不均匀沉降变形要求也是很高的(5～10μm/m)。其中φ130镗床基础是坐落在约6m深的回填土上,另一个φ160镗床基础坐落在砾砂土上。根据计算,两处天然地基都不能满足变形的要求。第一次所采取的设计方案是:φ130镗床做2.5m厚钢筋混凝土
In the fourth quarter of 1986, the Infrastructure Department received the design and construction tasks for the two basic equipments. The two boring machines were imported from abroad and required high accuracy of the foundation. In addition to the foundation itself to have sufficient stiffness, the uneven settlement deformation requirements of the foundation are also very high (5 ~ 10μm/m). The φ130 boring bed foundation is located on the backfill soil about 6m deep, and the other φ160 boring bed foundation is located on the gravelly sand. According to calculations, two natural foundations cannot meet the requirements of deformation. The first design proposal adopted was: φ130 trampoline made of 2.5m thick reinforced concrete