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黄岛电厂冲灰渡槽坐落在海滩上,作业条件差。渡槽基础为独立杯型基础,持力层是砂质土层,埋深4～5m。所处地段地表是细砂湿淤泥,塑性较大。经分析比较,决定采用砖沉井法进行渡槽基础施工。砖沉井施工一般是先浇制混凝土刃脚,待其达到一定强度后砌筑砖井筒,待砂浆达到一定强度后,挖土沉井。但这种施工方法不能连续作业。虽然混凝土刃脚工作量不大,但野外施工困难较多。为此,我们简化了砖沉井施工工艺,把砖沉井改为一次施工,减少了野外作业工作量,缩短了工期。现将施工方法介绍如下: 1.刃脚我们把现浇混凝土刃脚改为型钢刃脚,
Huangdao Power Plant’s ash aqueduct is located on the beach with poor working conditions. The foundation of the aqueduct is an independent cup type foundation, and the bearing layer is a sandy soil layer with a depth of 4 to 5m. The surface of the site is fine sand, wet sludge, and has a large plasticity. After analysis and comparison, it was decided to use the brick open caisson method for aqueduct foundation construction. Brick open caisson construction is generally preceded by pouring concrete cutting edge, until it reaches a certain strength, brick masonry masonry, after the mortar reaches a certain strength, dig soil caisson. However, this construction method cannot operate continuously. Although the workload of concrete cutting edge is not large, the field construction is more difficult. To this end, we simplified the construction process of brick open caisson and changed the brick caisson to a one-time construction, which reduced fieldwork workload and shortened the construction period. The construction method is introduced as follows: 1. Cutting edge We change the cast-in-place concrete cutting edge into a steel cutting edge.