Ultralarge section inclined single-pile foundation construction process based on vertical lifting system

Abstract

The invention discloses a ultralarge section inclined single-pile foundation construction process based on a vertical lifting system. A constructed ultralarge section inclined single-pile foundation is a reinforced concrete pile, and is provided with a reinforcement cage inside; the ultralarge section inclined single-pile foundation is constructed by the following steps: (1) the advance support construction is performed for a pipe roof; (2) hole opening protection: a hole opening support structure is constructed in a hole opening of a pile hole; (3) the vertical lifting system is installed; (4) the excavation, the slag discharge and the support construction are performed for the pile hole. The pile hole is excavated by multiple construction sections from top to bottom through a full-section excavation method; the slag discharge is synchronized in the excavation process; and the wall protection construction is respectively performed for pile hole sections excavated by all the construction sections; and (5) pile body construction: the reinforcement cage is bound and concrete is filled. The process is simple in steps, reasonable in design, low in investment cost, convenient for construction and excellent in use effect, can simply and quickly finish the construction process of the ultralarge section inclined single-pile foundation, and is easy to control the construction process.

Description

technical field [0001] The invention belongs to the technical field of pile foundation construction, and in particular relates to a super-large cross-section inclined single pile foundation construction technology based on a vertical hoisting system. Background technique [0002] For excavation cross-sectional area greater than 100m 2 When excavating a super-large cross-section inclined single-pile foundation with an inclination angle (that is, the angle between the central axis and the plumb line) greater than 45° (hereinafter referred to as the super-large cross-section inclined single-pile foundation), engineering measures must be taken to To ensure rock mass stability and operation safety during construction. When excavating the above-mentioned super-large cross-section inclined single-pile foundation in China, the excavation is mostly carried out according to the excavation method of mine tunnels, and the excavation method combining manual drilling and blasting with sm...

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Problems solved by technology

[0003] However, the above-mentioned excavation method has the following defects and deficiencies in the following three aspects: ① When excavating sections and steps, the safety of excavation is improved by reducing the construction space and increasing the support in the body, but the space is so small that it is impossible to use machinery. Coordination and low degree of mechanization have greatly reduced the construction progress and brought difficulties to the construction; ②The support process is complicated, and the use of manual installation of the support structure greatly reduces the construction efficiency, and it is impossible to monitor the changes of surrounding rocks in real time, and the construction safety risk is great ;③ Due to the large inclination angle of the foundation, large-scale machinery cannot enter and exit the foundation by itself, and the muck or ballast cannot be removed by rail transportation, and the construction efficiency is extremely low

Among them, the new Austrian method is greatly affected by terrain and geological conditions, and the construction difficulty factor for inclined shafts with an inclination angle greater than 45° is very high, the degree of mechanization is low, and the construction process is difficult

The shield method is mainly suitable for tunnel excavation projects, and the construction investment is large and the site is limited, so it is not suitable for excavation construction of super-large cross-section inclined single-pile foundations.

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