The invention relates to the technical field of cast-in-place pile removal, and discloses a construction method for removing cast-in-place piles in a shield crossing area under a viaduct and protecting a bridge foundation. Determining the position of an old pile; the crawler-type full-casing full-slewing drilling machine is in place, a low-lying short-arm crawler crane is used for hoisting the casing, and the casing rotates downwards to be cut to surround the periphery of the old pile bearing platform; hoisting a micro wedge-shaped drill hammer, embedding the micro wedge-shaped drill hammer between the old pile bearing platform and the inner side wall of the sleeve, driving the sleeve to rotate until the old pile bearing platform is twisted off, and taking out the old pile bearing platform; the sleeve is driven to continuously press and cut the soil layer until the lower portion of the sleeve surrounds the upper portion of the old pile; the micro wedge-shaped drill hammer is embedded between the old pile and the inner side wall of the sleeve, the sleeve is driven to rotate till the insertion section is twisted off, and the insertion section is taken out; the steps are repeated until the length of the residual pile section is smaller than the set length, and the residual pile section is crushed and the hole is cleaned through a miniature cross-shaped punch hammer; backfilling cement mortar; and the sleeve is pulled out.

    本发明涉及灌注桩清除的技术领域,公开了高架桥下盾构穿越区灌注桩清除及桥基保护施工方法,在盾构路线与桥基之间施工形成多个格挡桩;确定旧桩桩位;履带式全套管全回转钻机就位,利用低趴短臂履带吊吊装套管,套管回转朝下切削至环抱在旧桩承台的外周;吊装微型楔形钎锤,微型楔形钎锤嵌入至旧桩承台与套管内侧壁之间中,驱动套管回转,直至旧桩承台被扭断,将旧桩承台取出;驱动套管继续下压切削土层,直至套管的下部环抱在旧桩的上部上;微型楔形钎锤嵌入至旧桩与套管内侧壁之间,驱动套管回转,直至插入段被扭断,将插入段取出;重复上述步骤,直至残桩段的长度小于设定长度,利用微型十字冲锤将残桩段破碎,清孔;回填水泥砂浆;起拔套管。


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    Title :

    Construction method for removing cast-in-place piles in shield crossing area under viaduct and protecting bridge foundation


    Additional title:

    高架桥下盾构穿越区灌注桩清除及桥基保护施工方法


    Contributors:
    MENG ZEXIANG (author) / LI XINLIN (author) / GAO FEIPENG (author) / LEI BIN (author) / LIANG YAOXIANG (author) / TONG XIN (author) / HONG SHENGNAN (author) / XIA ZHENTAO (author) / QIAN CHANG (author) / WU XIWEN (author)

    Publication date :

    2024-12-06


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Chinese


    Classification :

    IPC:    E02D FOUNDATIONS , Gründungen / B66C Krane , CRANES / E21B EARTH OR ROCK DRILLING , Erd- oder Gesteinsbohren



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