挖孔桩承载力探讨与工程实例

Study on the load of pile in excavated Hole and Engineering Cases

本文对目前常用的挖孔桩承载力计算公式进行了探讨,并结合两个不同类型的挖孔桩工程实例,说明选用合适的计算公式和对计算参数的正确取值具有重要的实际意义。实例一为对正在施工的十六层办公大楼工程进行咨询,通过计算,发挥挖孔桩的潜在承载能力,仅基础工程即节约钢材70.98t,节约混凝土403.37m^3。实例二为某工业厂房,原设计采用天然地基和灌注桩方案,经过研究修改设计,改为挖孔桩方案,并采用嵌岩、锚固的措施提高桩基的承载力,计节约基础工程造价48.9万元,并加快了工程的进度。

This paper discusses the formula for calculating the load on pile in excavated holes. It is shown that the selected parametres with correct values are very important for an applicable formula. The first case of study is an engineering in consultation, which is a sixeen-storey office building in construction. By calculation, the potential load of the pile in excavated hole is gained. The method can save steel materials 70. 98 ton and concrete 403. 37 m for the foundation engineering. The second case study is an industrial building. The original programmes of that building are natural building and filling piles, but the corrected desing is taking piles in excavated holes, adopting the measures for adding the toads on the piles, such as inse rtin the piles into foundation rock, and fixing the piles by anchors. The result shortens the duration of construction engineecing and saves construction cost about RMB 489. 000 yuan for the foundation engineering.