九江市第三水场取水泵房沉井,位于长江中游江边上,是一圆形构筑物,外径为28.2米,壁厚1.1米。为了抢在一个枯水期内建成,要求第一节沉井一次制作18.8米高。施工方案几经周折,最后采用土模支承法施工,取得了十分理想的效果。一、方案制订本工程由于一次施工高度高,刃脚底荷载很大,设计院建议采用混凝土作支承层。但由于下沉时,缺乏拆除混凝土垫层的可靠手段,经多方共同商定,仍决定采用习惯的垫枕木支承方案,按荷载 The Caijing, the third pumping house in Jiujiang City, is located on the river bank in the middle reaches of the Yangtze River and is a circular structure with an outside diameter of 28.2 meters and a wall thickness of 1.1 meters. In order to rush to build in a dry period, the first section of the caisson was required to make 18.8 meters high once. The construction plan was frustrated, and the soil mold support method was finally used to achieve a very satisfactory result. I. Formulation of the Project Because of the high height of one-time construction and the large load on the bottom of the cutting edge, the Design Institute recommends using concrete as the supporting layer. However, due to the lack of reliable means to remove concrete cushions due to subsidence, many parties agreed to adopt a customary cushion sleeper support program according to the load.