高压循环注浆结合钢管托换在桩基补强中的应用探讨

Application of Combination of High-pressure Circulation Grouting and Steel Pipe Underpinning in Pile Foundation Reinforcement

摘要:

灌注桩施工过程中，经常遇到不良地层，导致在灌注桩身混凝土的过程中，孔壁局部坍塌，使得土体进入混凝土中，造成灌注桩断桩、桩身混凝土存在缺陷及桩端承载力不足等情况。而高压循环注浆结合钢管托换补强技术可以很好地对上述问题进行处理。结合桩基补强工程实例，对其设计、计算和应用进行探讨和分析，并对高压循环注浆结合钢管托换补强技术加固效果进行抽心检测，检测结果表明：经补强加固后的桩基承载力满足设计要求。

Abstract:

Bad geological conditions are often encountered in bored pile construction process, which cause local collapse of hole wall and soil mixing into concrete in the concrete grouting; these lead to bored pile broken, concrete defects in pile body and insufficient bearing capacity of pile end. High pressure circulation grouting with steel pipe underpinning reinforcement technology can be very good to deal with the problem. Take high pressure circulation grouting with steel pipe underpinning reinforcement technology as the research object and with the engineering case of pile foundation reinforcement, analysis is made on the design, calculation and application; the reinforcement effect is tested by core-collection, test results show that the bearing capacity of pile foundation meets the design requirements after reinforcement.