温州中心片污水处理厂深基坑工程的设计与施工

Design and Construction of a WWTP Deep Foundation Pit in Wenzhou Central Area

温州市中心片污水处理厂基坑支护工程设计及施工面临很多技术难题,实施过程中对整个基坑支护设计、施工全过程进行了精细化研究。采用数值反分析手段建立考虑盆边留土作用的基坑支护结构分析计算参数m的取值公式;根据开挖深度、土体性质、周边情况综合比选基坑支护形式,优化施工方案,并着重对高压旋喷预应力锚杆工艺中的斜向引孔、锚杆安装、成桩等工序进行详细方案设计;针对土方开挖及运输工程制定了完善详细的施工组织计划;通过不断优化全过程方案,在保证安全可靠的前提下,节约了大量投资,取得了较好的经济效益。

There are many technical challenges in the design and construction of foundation pit support project in Wenzhou central area wastewater treatment plant(WWTP).The entire foundation pit support design and construction process during implementation are studied.The numerical inverse analysis method is used to establish the formula for calculating parameter m of foundation pit supporting structure considering soil retention at basin edge.According to the comprehensive comparison of excavation depth,soil properties and surrounding conditions,the supporting form of foundation pit is selected,the construction scheme is optimized,and the exhaustive scheme design is focused on the diagonal pilot hole,anchor installation,pile formation and other processes in the high-pressure rotary spray prestressing anchor process.Detailed construction organization plan is developed for earthwork excavation and transportation engineering.Through continuous optimization of the whole process scheme,under the premise of ensuring safety and reliability,a lot of investment has been saved,and better economic efficiency has been achieved.