Reamer for deep-thick soft soil self-made retaining wall hole-forming and hole-forming method using reamer

Abstract

The invention relates to a reamer for deep-thick soft soil self-made retaining wall pore-forming and a pore-forming method using the reamer. The reamer comprises a pipe body, a drill bit, a cutting stirring rack and a powder conveying system, wherein the pipe body comprises an outer pipe and an inner pipe, the upper end of the outer pipe is detachably connected with a double pipe drill rod with acore pipe, the lower part of the outer pipe is embedded and sleeved with the inner pipe, and the lower end of the inner pipe is detachably connected with the drill bit; the cutting stirring rack is arranged outside the pipe body in the circumferential direction. The pore-forming method comprises the following steps of, calculating the reaming range according to the designed effective depth of a drill hole and the thickness of the retaining wall, and then determining the size of the reamer; carrying out the reaming through the reamer, stirring the powder sprayed from the reamer and the soil, and solidifying the powder and the soil so as to form a retaining wall ring; and bringing the soil and powder mixture in the drill hole out of the hole through a spiral blade of the drill rod so as to form a hole. According to the reamer and the hole forming method, the problems of drill hole shrinkage and hole bottom mud burst are solved; and the bearing capacity of a pile is increased due to the fact that the hard soil and powder solidified body is distributed on the periphery of the drill hole.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a self-made wall agitator for forming holes in deep soft soil and a hole-forming method using the agitator. Background technique [0002] At present, pile foundations are mostly used in urban construction in soft soil areas. However, due to the large porosity, high water content, low strength, and weak permeability of soft soil, boreholes in soft soil tend to shrink in diameter, and the greater the depth, the more serious the diameter shrinkage, even Problems such as hole collapse and mud gushing at the bottom of the hole occurred, resulting in no drilling footage, ground subsidence, and nearby engineering piles deflected. Over the past half a century, with the application of a large number of pile foundations, various pile foundation construction methods have emerged in an endless stream, but at present, steel casing wall protection is mostly used to so...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problems of borehole shrinkage and mud gushing at the bottom of the hole in the construction of deep and long pile foundations in deep soft soil, the present invention provides a self-made wall expansion agitator for forming holes in deep soft soil and a pore forming method using the expansion agitator. Developed a new idea of ​​replacing steel pipes with in-situ retaining rings

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