Wedge-shaped isolation type anti-drag precast pile and construction method thereof: Fid-Bau Portal

Wedge-shaped isolation type anti-drag precast pile and construction method thereof

SONG WEIJIE / ZHU QINGKAI / LI JIANPING / KANG JINGWEN / FENG ZHENTONG / LIU GUANGLEI / WU SIYU

The invention discloses a wedge-shaped isolation type anti-drag precast pile and a construction method thereof, and belongs to the technical field of pile foundation construction. The precast pile is of a circular truncated cone-shaped or prismatic table-shaped structure, a grouting pipe is arranged in the precast pile, a grouting opening in the grouting pipe is formed in the surface of the precast pile, the side, close to the ground, of the precast pile is a large-section end, the solidified soil pile is of a cylindrical structure, and the precast pile and the solidified soil pile are connected in a bonding mode; the specific construction method of the wedge-shaped isolation type anti-drag precast pile comprises the following steps that the solidified soil pile is constructed; a precast pile is implanted; settling the surrounding soil body; grouting and reinforcing; and continuously reinforcing. The solidified soil pile is additionally arranged on the outer side of the precast pile, so that the strength of the soil body around the precast pile is improved, and greater horizontal resistance can be provided; and in addition, the gap between the precast pile and the solidified soil pile is grouted in time, so that the horizontal resistance is improved, and the field use is facilitated.

本发明公开了一种楔形隔离式减阻预制桩及其施工方法，属于桩基施工技术领域，包括预制桩、固化土桩；预制桩为圆台形或棱台形结构，预制桩内设置有注浆管，注浆管上的注浆口设置在预制桩表面，预制桩靠近地面一侧为大截面端，固化土桩为圆柱形结构，预制桩与固化土桩之间粘结连接；楔形隔离式减阻预制桩的具体施工方法如下：施工固化土桩；植入预制桩；周边土体沉降；注浆加固；持续加固。本发明通过在预制桩的外侧增加固化土桩增大了预制桩周边土体的强度，有利于提供更大的水平抗力；并且对预制桩与固化土桩之间的缝隙及时注浆，不但提高水平抗力，更有利于场地的使用。

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