Construction method of wave-shaped micro pile structure for foundation reinforcement: Fid-Bau Portal

Construction method of wave-shaped micro pile structure for foundation reinforcement

WANG CHENGCAN / YAN ZIHAI / CUI HAO / SHEN BIHUI / LIU CHANGBAO

The invention relates to a construction method of a wave-shaped micro pile structure for foundation reinforcement. According to the technical scheme, the construction method of the wave-shaped micro pile structure for foundation reinforcement is characterized by comprising the steps that preparation work is conducted, specifically, measuring, positioning and paying off are conducted, and a pile foundation is in place; drilling to form a micro pile hole; a spray head of a jet grouting machine tool is arranged at the designed elevation position of the bottom of the micro pile in the pile hole; a high-pressure jet grouting technology is adopted for forming a pile body in a drilled hole, the pile body is composed of expansion bodies and uniform cylinders in an alternating mode from bottom to top, the diameter of the expansion bodies is larger than that of the uniform cylinders, and during pile forming, all sections of the pile body form the uniform cylinders or the expansion bodies by controlling high-pressure jet grouting pressure and/or the lifting speed of a spray head; after grouting is completed, steel bars are vertically inserted into the pile body; placing a mold on the top of the pile body and pouring concrete to form a pile cap. The method is suitable for the technical field of geotechnical engineering.

本发明涉及一种用于地基加固的波形微型桩结构施工方法。本发明的技术方案为一种用于地基加固的波形微型桩结构施工方法，其特征在于：准备工作，包括测量定位放线，桩基就位；钻设形成微型桩桩孔；将旋喷机具的喷头置于桩孔内微型桩桩底设计高程位置；采用高压旋喷注浆工艺在钻孔内形成桩体，桩体由下而上由扩大体和均匀圆柱体交替组成，扩大体直径大于均匀圆柱体直径，成桩时通过控制高压旋喷压力和/或喷头提升速度使桩体的各段形成均匀圆柱体或扩大体；注浆完成后在桩体内竖直插入钢筋；在桩体顶部放置模具并灌注混凝土，形成桩帽。本发明适用于岩土工程技术领域。

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