深水无覆盖层地层钢护筒沉放关键技术

Key Technology of Sinking Steel Protective Sleeves in Deep-water Areas

钢护筒施工是水上桩基施工的一个重要组成部分,也是影响桩基质量因素之一。广东佛山西樵大桥斜拉桥主桥墩桩基施工难点是水深、流速大、无覆盖层。因此钢护筒沉放质量控制直接影响到桩基成桩的质量。针对该水域的特点,主要介绍在钢护筒施工过程中出现的问题以及相关的应对措施,包括:钢护筒底口补强、钢护筒对接、钢护筒导向架定位、钢护筒漏浆处理等。

Construction of steel protective sleeves is important in pile foundation construction,and it is also one of the factors that affect pile foundation quality.Construction of the pile foundation for Xiqiao Bridge in Foshuan,Guangdong is featured with difficulties of deep water,high flow speed and the absence of overburden layer.Therefore the quality of sinking the steel protective sleeve directly affects the quality of pile foundation.Taking into account the characteristics of the waters,this paper introduces problems and relevant countermeasures during the construction of the steel protective sleeves,including strengthening of the bottom of the steel casings,connection of the steel casings,positioning of the guide frame,leakage treatment for the steel casting,etc.