适用于中空管桩的高压射流破碎关键技术研究

Study on Key Technologies of High-Pressure Water Jet Demolition Applicable to Hollow Tubular Piles

摘要: 针对地下工程中传统刀具直接破除桩基所产生的弊端，进行高压射流切割桩基的可行性研究，开展了高压磨料射流切割等比中空管桩试验。研究结果表明：高压射流切割每隔20˚的纵向切割以及间隔100 mm的环向切割，可以实现法兰连接部分的破碎，且破碎后的粒径不大于180 mm，达到了试验所需的破碎要求；切断中部法兰需同时满足高切割压力(>180 Mpa)和低切割速度(<12 mm/min)。

Abstract: Aiming at the shortcomings of traditional tools in directly breaking pile foundations in underground engineering, a feasibility study on cutting pile foundations using high-pressure water jet technology was conducted. Experiments involving cutting scaled-down hollow tubular piles with abrasive water jets were carried out. The research results indicate that longitudinal cuts at 20˚ intervals combined with circumferential cuts at 100 mm intervals can achieve the fragmentation of the flange connection section. The resulting fragmented particles have a size of no more than 180 mm, meeting the crushing requirements of the experiment. To cut through the central flange, it is necessary to simultaneously satisfy the conditions of high cutting pressure (>180 MPa) and low cutting speed (<12 mm/min).