装配式预应力鱼腹梁内支撑系统的利与弊

Advantages and Disadvantages of Assembled Pre-stressed Fish-belly Beam Inner Strut System

装配式预应力鱼腹梁内支撑系统是一种新型的基坑支护型式,近年来应用越来越多。该系统是由鱼腹梁、对撑、角撑、三角连接构件和围檩等钢构件拼装构成,因此其钢结构等在支撑拆除后可以完全回收。然而,作为一种先进技术,目前尚未被工程人员所认识、掌握,对其应用过程中所需注意的地方更是不了解,因此限制了该种工法的应用范围,同时也会忽略一些问题而导致工程出现问题。由于国内对该方面内容研究较少,对该种新技术的应用更是少之又少。对此,该文以南京南站绕城公路地道为工程案例,通过对工程施工全过程的分析,总结该支撑系统的优点及不足,旨在抛砖引玉,引起同行专家讨论,供将来类似工程设计参考。

The assembled pre-stressed fish-belly beam inner strut system is a new supporting type of foundation pit and is used more frequently in recent years.The system is composed of steel assembled components of fish-belly beam,diagonal brace,angle brace,triangle connecting peaces and circuit purlin.Therefore,the steel structures can be completely reused after the braces disassembled.However,this advanced technique hasn't been known and mastered by the most engineers,who even more do not understand the points for attention in its application process.In result,this process is limited in its application range.Besides,some problems are ignored so as to cause the faults of the projects.This new technology is a few used because of a few study of it in China.By the engineering case of Nanjing South Station Ring Highway Subway,the article analyzes the whole engineering construction process and sums up the advantages and disadvantages of this strut system in order to carry out more discussion and study,which can be referred for the design of the similar projects.