深水急流复杂环境条件下钢栈桥加固技术

Reinforcing Techniques for Steel Trestles Under the Complex Conditions of Deep Water and Rapid Flow

为解决某特大桥施工中临时钢栈桥的稳定性及使用安全问题,以潮汐影响较大的感潮河段环境下的钢栈桥为研究对象,针对其钢管桩基础处于水深、急流、裸岩环境下,钢管桩持力层以上无足够覆盖层的现状,分别采取布设板凳桩、锚杆锚固及冲孔锚固钢管桩、抛混凝土锚等加固措施。实践表明,该三种加固措施能够有效、快速的解决水深急流裸岩河床环境下钢管桩的安全稳定问题,对类似工程有借鉴意义。

Aiming at solving the problems of the stability and the safe use of the steel trestle for the construction of a certain mega bridge,and taking a trestle in the much tide-affected environment of a river section as the object of our research,studied in detail in the present paper are the reinforcing techniques for the construction of trestles.As the steel tube pile foundation is located in the environment of deep water,rapid flow and bare rock,and there are no sufficient covering layers on the force-bearing layer of the steel tube pile,taken here for the project are the reinforcing measures such as providing bench piles,anchoring with anchorage bolts,boring holes for anchoring the steel tube anchorage piles,casting concrete anchors,etc.The result of the construction shows that the above-mentioned three reinforcing measures can effectively and rapidly solve the problems of steel tube piles in safety and stability in the riverbed environment of deep water,rapid flow and bare rock.The project may well serve as a useful reference for other similar projects.