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沮漳河特大桥99#水中墩钢板桩围堰内承台深埋,跨枯水期和初汛施工,设计抽水水头14 m,堰内开挖深达9.4 m,与6层围囹安装干扰极大。如何顺利完成钢板桩插打合龙、如何结合围囹安装进行超深覆盖层的快速开挖、如何结合承台、墩身施工分层拆除围囹以及利用墩身作为围堰的水上拆除平台是项目成败的关键因素,笔者分别对其进行介绍。
The deep capped pile cap of steel sheet pile cofferdam of No. 99 # water pier in Juzhanghe River Bridge is designed to cross the dry season and flood season. The pumping head is designed to be 14m deep and the depth of excavation within the weir is 9.4m, which greatly interferes with the installation of the 6 - . How to smoothly complete the insertion and closing of steel sheet piles, how to combine the circumferential excavation with the rapid excavation of the ultra-deep overburden, how to combine the platform with the pier body to demolish the perimeter in a layered manner and use the pier body as the cofferdam is a project of water dismantling Success or failure of the key factors, the author introduced them separately.