扶壁式高大坞墙施工关键技术

Key technology of buttress type high and large dock wall construction in dock

针对扶壁式高大坞墙水平位移、模板施工工效低、混凝土施工质量差等问题,以东方项目船坞工程中的现浇混凝土扶壁式坞墙结构为研究对象,采用有限元分析的方法进行坞墙偏移量模拟计算,并设置5 mm施工预偏量,依据《建筑施工模板安全技术规范》进行高大可拼装整体式木模板的设计,采取电加热丝加热老混凝土减少新老混凝土不同步收缩、增加浇筑点等措施,满足了坞墙廊道顶部龙门吊轨道安装误差不大于5 mm的精度要求,节省了坞墙结构的施工工期60余天,减少了混凝土约束裂缝以及蜂窝麻面、缝隙夹层等质量通病的产生,对类似高大坞墙结构施工项目有一定的借鉴意义。

Aiming at the problems of horizontal displacement of tall and large buttressed dock walls,the low efficiency of formwork construction and the poor quality of concrete construction,we study the cast-in-place concrete buttressed dock wall in the dock project of the Dongfang Project,use the finite element analysis method to simulate the offset of the dock wall and set a 5 mm construction pre-offset,design tall and assembled integral wood formwork according to Technical Specification for Safety of Building Construction Formwork,heat old concrete by electric heating wire to reduce the shrinkage of new and old concrete and add pouring points.These measures meet the accuracy requirement that the installation error of the gantry crane track at the top of the dock wall gallery is not more than 5 mm,save more than 60 days of construction time for the dock wall structure,and reduce concrete constraint cracks and the occurrence of common quality problems such as honeycomb,hemp surface,gap interlayer and so on.The research has certain reference significance for the construction projects of similar tall and large dock wall structures.