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由日本托恩钻探公司研制开发的TRC-U型多钻头钻具及钻进工艺,在成桩底部形成一钟形扩大头,利用反循环排渣,可加快成桩速度,提高桩的承载力,减少混凝土用量和钻孔弃渣,避免了施工产生的噪声、振动等公害。 1 TRC-U型钻具 TRC-U型钻具是一种用于反循环钻孔的专用组合钻头,包括上、下两部分,见图1,其上部由2台潜水电机和相应的齿轮减速系统组成固定机构。下部是转动切削部分,带3只扩孔臂杆,每一臂杆端装有1只可回转的钻头。张开或收回扩孔臂杆,钻头(刃)以行
The TRC-U multi-bit drill tool and drilling technology developed by Japan’s Toon Drilling Co., Ltd. form a bell-shaped enlarged head at the bottom of the pile. The use of reverse circulation slag can speed up the pile-forming speed and improve the bearing capacity of the pile. , to reduce the amount of concrete and drilling slag, to avoid the construction of noise, vibration and other public hazards. 1 TRC-U Drilling Tool TRC-U Drilling Tool is a special combination drill bit for reverse circulation drilling, including upper and lower parts. See Figure 1. The upper part is composed of 2 submersible motors and corresponding gear reduction. The system consists of fixed institutions. The lower part is a rotating cutting part with 3 reaming booms, and each boom end is equipped with a rotary bit. Open or retract reamer boom, bit (blade) to row