Excavation and retaining wall construction technology of super-large cross-section inclined single-pile foundation

Abstract

The invention discloses an excavation and retaining wall construction process of a super-large cross-section inclined single pile foundation, comprising steps: 1. Advance support construction of a pipe shed; 2. Hole opening protection; The excavation method is to excavate the pile holes in multiple construction sections from top to bottom, and carry out wall protection construction for the pile hole sections excavated and formed in each construction section. The process is as follows: 301. Initial construction section excavation and Retaining wall construction: Excavate construction from top to bottom by drilling and blasting method, and use full-section support structure for support; 302, excavation and retaining wall construction in the next construction segment; 303, repeat step 302 several times until completed Excavation and retaining wall construction process for all construction sections. The invention has the advantages of simple process steps, reasonable design, low investment cost, convenient construction and good use effect, and can simply and quickly complete the excavation and wall protection construction process of the super-large cross-section inclined single pile foundation, and the construction process is safe and easy to control.

Description

technical field [0001] The invention belongs to the technical field of pile foundation construction, and in particular relates to an excavation and retaining wall construction technology of a super-large cross-section inclined single-pile foundation. 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

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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