水下钢管桩内切割施工工法及定额研究

施工钢栈桥钢管桩基础拆除过程中，由于现场水深不足、波高浪急和施工机械设备能力限制，常规机械拔桩和潜水员水下割桩等方法难以实施。结合某境外工程，对水下钢管桩从桩体内部进行切割的施工工法进行研究。采用在拟切除钢管桩外打设钢护筒，搭设施工平台，通过远程控制切割枪系统实现在钢管桩内部泥面高程部位对钢管桩切割的施工工法，有效解决了钢管桩拆除的难题。同时，就该施工工法所需的人工、材料和施工机械设备的种类及使用量进行研究分析，总结得出施工定额。

Construction method and quota of underwater steel tube pile cutting in-pile

Due to the insufficient water depth,high wave and limitation of construction equipment,it is difficult to implement conventional methods such as mechanical pile-pulling and underwater pile-cutting by divers in the removal process of the steel tube pile for temporary steel trestle.Based on an overseas project,we study the new construction method of underwater steel tube pile cutting in-pile body.By laying steel casing outside the steel tube pile,we set up a construction platform,and use the construction method of cutting the steel tube pile inside at the mud surface elevation through remote control of the cutting gun system,and effectively remove the steel tube pile.At the same time,we obtain the construction quota through studying and analyzing the resource usage of labor,materials,construction equipment required by the construction method.