Reinforced friction grouting pile, construction device and construction method

Abstract

The invention provides a construction device for reinforced friction grouting piles, comprising: a drill rod installed on a drilling machine and used to drill soil to form a pile hole; Move up and down inside; wherein, the bottom of the column is fixed with a tamping hammer, and is used to tamp the soil layer at the bottom of the pile hole, and the outer wall of the column is provided with a reaming mechanism that can expand and move symmetrically around; through The hole wall is tamped and strengthened, so that when concrete is poured into the pile hole, the soil layer on the hole wall is more compact, and will not collapse due to instability, causing the concrete pile body to be filled with mud or necked during the pouring process. The material of the pile body will not be mixed with large collapsed objects, the strength of the pile body can be maintained, and a concave reaming part can be formed on the hole wall, so that the hole wall is not easy to collapse during grouting, and the pile body is reaming after grouting A protruding damping part is formed at the part to enhance the side frictional resistance of the pile body.

Description

technical field [0001] The invention relates to the technical field of cast-in-place pile construction, in particular to a reinforced friction cast-in-place pile, a construction device and a construction method. Background technique [0002] Bored cast-in-place pile refers to the pile hole formed in the foundation soil by means of mechanical drilling, steel pipe extrusion or manual excavation at the project site, and a pile made of steel cage and poured concrete is placed in it. When the pile foundation is constructed in a relatively soft area, the axial load of the pile body is supported by the friction resistance of the pile side and the reaction force of the pile bottom soil, and the pile whose side friction resistance plays the main supporting role, also called friction pile, is mainly used. The foundation buried deep in the rock layer is a pile in which the load on the top of the pile is borne by the resistance of the pile side under the state of ultimate bearing capaci...

AI Technical Summary

Problems solved by technology

[0003] The current friction piles are all equipped with damping structures protruding from the surface of the pile body on the periphery of the pile body, such as protruding cement rings, annular plates or pockets, etc., although the distance between the pile body and the pile hole is increased. However, due to the soft soil layer in the pile foundation area, the inner wall around the pile hole has not been strengthened, and the soil layer around the pile hole is not firm enough. When pouring concrete, the local hole wall soil layer will be unstable. Slump, resulting in concrete pile body mud or necking during pouring, resulting in reduced strength of the pile body

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