三角型四面棱体在河床裸岩栈桥基础中应用

Application of Triangular Four-sided Prism for Foundation of Trestle Bridge in Riverbed with Bare Rock

施工栈桥广泛应用于桥梁、隧道等建筑工程,直接为施工服务,是工程施工物流交通的重要组成部分.本文以广西壮族自治区南宁外环高速公路大冲邕江特大桥8号墩栈桥施工为背景,针对本施工栈桥基础位于河床裸岩的特点,以《河床裸岩栈桥防洪装置》专利技术为基础,提出利用三角型四面棱体在栈桥钢管立柱底部形成加固基础取代传统栈桥基础加固方法,有效降低水流冲刷力,提高栈桥的整体抗倾覆性和稳定性,为同类工程的施工提供了有益的参考.

Construetion trestle is an important part of engineering construction logistics,which is widely used in bridges,tunnels and other construction projects.Based on the construction of Pier No.8 of Dachong-Yongjiang Super Large Bridge of Nanning Outer Ring Expressway in Guangxi Zhuang Autonomous Region,the characteristics of the construction trestle in the riverbed bare rock were noticed,the triangular four-sided prisms were adopted to form a reinforcement foundation at the bottom of the trestle steel pipe column and replace the traditional trestle foundation reinforcement,based on the patented technology of the river bed bare rock bridge flood control device,which reduced the water flow scouring force effectively,improved the overall anti-overturning property and stability of the trestle bridge.This could provide a useful reference for the construction of similar works.