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在静压钢管桩施工过程中经常遇到桩长过大但单桩压力却无法满足设计要求的情况,针对此情况提出了在钢管桩制作时每隔一定距离在桩两侧增设耳托板,同时在耳托板上部的管壁上打孔的解决方案。结合某一实际工程的地基加固,进行了常规试桩、增设耳托板试桩、增设耳托板加侧孔注浆及底部敞口无耳托板加侧孔四类试桩的现场试验。试验结果表明,采取在钢管桩上增设耳托板加侧孔,压桩后在向管内注入细石混凝土时将有部分浆液通过侧孔流出,凝固于管壁周围,起到了增加侧阻力和稳定桩身的作用。该工程实践证明,采用增设耳托板与侧孔注浆两种措施联合使用可有效地增加静压钢管桩的承载能力,并可降低工程造价。
In the process of static pressure pipe pile construction often encountered pile length is too large, but single pile pressure can not meet the design requirements, in view of this situation proposed in the production of steel pipe piles at a certain distance at both sides of the pile Board, while drilling the top wall of the ear plate solution on the wall. Combined with the foundation reinforcement of an actual project, the conventional tests were carried out, the earpick test piles were added, the ear pallets plus side holes grouting and the bottom open earless pallets plus side pockets were tested in field. The test results show that the earpads and side holes are added on the steel pipe pile. When the concrete is injected into the pipe, there will be a part of slurry flowing out through the side holes and solidifying around the pipe wall, thereby increasing the lateral resistance and Stabilize the role of the pile. The engineering practice proves that the combination of adding ear plate and side hole grouting can effectively increase the bearing capacity of static pressure steel pipe pile and reduce the construction cost.