增设耳托板和侧孔注浆对静压钢管桩承载能力的影响  

Effects of adding ear bracket plates and side hole grouting on bearing capacity of static pressure steel-pipe piles

作　　者：王天晴[1] 董华阳[1] 李君成[1] 陈映棠[1] 董立恒 王璀瑾[2] 

机构地区：[1]山西省建筑科学研究院,太原030001 [2]大连理工大学建设工程学部,大连116024

出　　处：《建筑结构》2016年第8期70-75,共6页Building Structure

摘　　要：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 construction process of static pressure steel-pipe pile,there is often such case where the pile length is too large but single pile pressure cannot meet the requirements of the design. Based on this fact,it proposes the solving scheme that adding ear bracket plates on both sides of the pile at every certain distance in the production of steel-pipe pile,and punching holes on the pipe wall of the upper part of the ear bracket plates. Based on the foundation reinforcement of a actual project,four kinds of pile field tests were conducted including conventional test pile,conventional test pile with ear bracket plates,conventional test pile with adding ear bracket plates and side hole grouting and conventional test pile with open bottom and side hole grouting. Experimental results show that when adopting additionally ear bracket plates and side holes in steel-pipe pile,there will be part of the slurry flowing through the side holes after pressuring pile and injection of fine stone concrete into the inside of the pipe. And the slurry is solidified around the wall of the pipe to increase the pipe side resistance and stabilize pile body. The engineering practice proves that the two measures combined use of adding ear bracket plates and side hole grouting can effectively increase the bearing capacity of the static pressure steel-pipe pile,and can reduce the cost of the project.

关 键 词：小型钢管桩 单桩承载力 耳托板 侧孔注浆 静压试桩 

分 类 号：TU473.1[建筑科学—结构工程]