Hole pile construction method

Abstract

The invention relates to the technical field of pile work and discloses a pile construction method and pile casings. The pile construction method includes the pore-forming steps of a, drilling a layer to a first depth and downwards placing a first layer of a pile casing; b, continuously drilling the layer to a second depth in the first layer of the pipe casing and downwards placing a second layer of a pipe casing; and c, performing continuous actions of drilling and downward placing according to the step b if the second depth doesn't reach the required pile depth until the drilling reaches an N depth , an N pile casing is downwards placed, and the N depth reaches the required pile depth. When the pile construction method is applicable to layers such as miscellaneous fill, a layer of the pile casing is downwards placed per section of drilled distance until the required pile depth is achieved, the stepwise drilled pore diameters are sequentially decreased, and the diameters of the pile casings matched with the pore diameters are also sequentially decreased. Compared with pile construction methods in prior art, the pile construction method has the advantages that the pile casing are easy to downwards place in place, particles which are easy to collapse on pore walls are prevented from falling into the holes, besides, secondary drilling is not required, and the phenomena of dreg falling in the pores and fast erosion of mortar are avoided.

Description

technical field [0001] The invention relates to the technical field of pile engineering, in particular to a method for constructing hole piles and a casing. Background technique [0002] At present, there are more and more rotary drilling rigs being used in the areas of miscellaneous filling soil formations. Although the rotary drilling rigs have a high hole-forming efficiency when drilling into miscellaneous filling soil formations, easy-to-collapse gravel formations or boulder formations, etc., However, due to the easy collapse of the hole wall and the special characteristics of large particles, quality accidents such as slag inclusion in foundation piles are often caused due to slag falling and rapid loss of mud at the lower wall during subsequent operations such as lowering of the reinforcement cage and concrete pouring. Therefore, whether the rotary drilling rig is suitable for construction in this type of formation is controversial. [0003] At present, in order to av...

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Problems solved by technology

[0005] In view of this, the present invention aims to propose a hole pile construction method and a casing to solve the problems of secondary drilling, a large amount of mortar and low drilling efficiency in the construction process of hole piles in existing strata such as miscellaneous fill.

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