Double-pipe ring drill steel pipe pile construction method: Fid-Bau Portal

Double-pipe ring drill steel pipe pile construction method

ZHANG JIHONG

The invention relates to a double-pipe ring drill steel pipe pile construction method and device in the field of civil engineering and a double-pipe composite steel pipe pile formed after construction. In the construction process, a cylindrical drill rod (7) and a steel pipe pile (1) are used for drilling construction at the same time, the cylindrical drill rod (7) is made to rotate relative to the steel pipe pile (1), the steel pipe pile (1) is used for providing part of or all counter force needed by drilling construction, drilling tools annularly distributed at the bottom of the cylindrical drill rod (7) are used for drilling construction, and a cylindrical drill hole with the annular cross section can be formed. After drilling is finished, the steel pipe pile (1) is directly left in the cylindrical drill hole, the cylindrical drill rod (7) and the drilling tools (13) can be repeatedly used, and the bearing capacity of the steel pipe pile can be improved by grouting the cylindrical drill hole. The structural characteristics that the steel pipe pile (1) is large in diameter and thin in wall can be fully utilized, the size of the drill hole is small, construction equipment is small, the speed is high, disturbance is avoided, hole collapse is avoided, towing settlement is avoided, the manufacturing cost is low, and environment-friendly benefits are good.

本发明涉及土木工程领域中的双管环钻钢管桩施工方法、施工装置及施工后形成的双管复合钢管桩，在施工过程中，同时使用筒状钻杆(7)与钢管桩(1)进钻孔施工，并使得筒状钻杆(7)相对于钢管桩(1)旋转，利用钢管桩(1)提供部分或全部钻孔施工所需的反力，由位于筒状钻杆(7)底部的环形分布的钻具进行钻孔施工，可形成横截面为圆环形的筒状钻孔，钻孔完成后，钢管桩(1)直接留在筒状钻孔中，筒状钻杆(7)、钻具(13)可重复使用，还可以通过向筒状钻孔中注浆，提高钢管桩的承载力，本发明能充分利用钢管桩(1)直径大、壁薄的构造特征，钻孔体积小，施工设备小、速度快，无扰动，不塌孔，无拖带沉降，造价低，环保效益好。

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