基于岩溶地质斜拉桥索塔钻孔灌注桩技术应用探究

Research on Application of Bored Pile Technology for Cable-stayed Bridge Tower Based on Karst Geology

岩溶地质环境下,地下会出现溶洞,从而不利于各种建筑的施工,还会导致建筑施工质量出现问题。在很多容易存在岩溶地质条件的地方,桥梁属于必不可少的设施,于是岩溶地质环境就会导致桥梁桩基不稳固、施工较复杂等缺陷。为了增强桥梁桩基的稳固性,文章将斜拉桥索塔钻孔灌注桩技术应用到岩溶地质环境下的桥梁中进行分析。将长江大桥作为研究对象,首先对大桥的工程概况进行简介,然后搭建平台,使得钻孔灌注桩能够顺利在该平台上进行施工。最后具体分析钻孔灌注桩技术在长江大桥中应用,在使用该技术进行施工时,首先选择旋挖钻和冲击钻这种组合方式进行钻孔,然后选择好合适的泥浆,这都属于钻孔灌注桩施工的准备阶段;然后再就是施工阶段,在施工过程中,涉及到4个不同的施工技术,分别为地基处理、护筒沉放、钻孔成孔和混凝土浇筑。基于岩溶地质条件下,对桥梁使用钻孔灌注桩技术能够提高桩基的稳固性和安全性。

Under the karst geological environment,karst caves will appear underground,which is not conducive to the construction of various buildings,and also causes problems in the quality of building construction.In many places where karst geological conditions are prone to exist, bridges are indispensable facilities,so the karst geological environment will lead to defects such as unstable pile foundations and complex construction.In order to enhance the stability of the bridge pile foundation,the paper applies the cable-stayed bridge tower bored pile technology to the bridge under the karst geological environment for analysis.Taking the Yangtze River Bridge as the research object,the project overview of the bridge is first introduced,and then a platform is built so that the bored pile can be successfully constructed on the platform.Finally,it specific analyzes the application of bored pile technology in the Yangtze River Bridge.When using this technology for construction,first choose the combination of rotary drilling and percussion drilling for drilling,and then select the appropriate mud.This all belongs to the preparation stage of the bored pile construction;and then there is the construction stage.During the construction process,four different construction techniques are involved,namely,foundation treatment,casing protection,borehole formation and concrete pouring.Based on karst geological conditions,the use of bored pile technology for bridges can improve the stability and safety of the pile foundation.