A kind of enhanced long auger bored pressure grouting concrete pile and its construction method

Abstract

The invention relates to a reinforced concrete pile with long helical drilling and pressure grouting. The bottom of the pile body and the side of the pile are provided with a pile bottom extruded and expanded composite end formed by pressure grouting and a pile side grouting extruded and expanded body; The grouting pipe and the pile side grouting pipe are respectively arranged on the inner side and the outer side of the spiral stirrup of the steel cage along the ring direction; the top of the pile body is provided with a prestressed reinforced concrete stiffener, and the lower part of the stiffener is provided with a pile top grouting extruder. The upper part is provided with reinforced flanks; prestressed steel sleeves and pile top grouting pipes are pre-embedded in the stiffening body, and the two are evenly spaced along the ring direction of the stiffening body. According to the present invention, the prefabricated stiffener structure on the top of the pile body can not only improve the strength of the pile top, but also strengthen the connection between the pile body and the upper structure. The pile top, pile side and pile bottom can be strengthened separately. The invention also discloses a construction method of the above-mentioned reinforced long helical drilled press-grown concrete pile.

Description

technical field [0001] The invention relates to a long helical drilled concrete pile, in particular to an enhanced long helical drilled concrete pile which can simultaneously increase the bearing capacity of the bottom, side and top of the pile body and effectively improve the mechanical performance of the pile body The invention relates to a construction method, belongs to the field of foundation treatment engineering, and is applicable to foundation treatment projects in buildings, bridges, embankments and other projects. Background technique [0002] Cast-in-situ pile refers to a pile type formed by mechanical drilling, steel pipe extrusion or manual excavation in the foundation soil at the engineering site, in which a steel cage is placed and concrete is poured. It has a small environmental impact. , high bearing capacity, reliable pile quality, and convenient construction organization have been widely used in foundation treatment projects. [0003] Cast-in-situ piles c...

AI Technical Summary

Problems solved by technology

This method can improve the bearing capacity of the pile body to a certain extent by grouting the outside of the pile body and the bottom of the pile; The shape of the grout is prone to problems such as uneven distribution of the grout and difficulty in effectively exerting the bearing capacity; in addition, this method does not involve the reinforcement treatment of the top of the pile

[0007] To sum up, cast-in-place piles have been widely used in foundation treatment projects. The existing cast-in-place pile structures and construction methods have also achieved good reinforcement effects under suitable engineering conditions, but the structure and construction of the pile itself are limited. Due to technical problems, the pile body still has room for improvement in terms of bearing capacity and mechanical performance; although there is pile side grouting technology, this technology cannot effectively control the shape of the grout, and cannot supplement the top of the pile body. strong processing

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