Excavation and ballast removal of super large section inclined monopile foundation

Abstract

The invention discloses an excavation and mucking construction technology of a super-large cross-section inclined single-pile foundation, comprising steps: 1. Advance support construction of a pipe shed; 1. Installation of ballasting equipment at the hole: install the ballasting equipment outside the hole of the pile hole; the ballasting equipment includes two longitudinal walking frames on the left and right, a horizontal walking frame that can move forward and backward on the two longitudinal walking frames, and a horizontal walking frame that can move left and right along the horizontal walking frame. Translational hoisting equipment and the mucking hopper hoisted under the hoisting equipment by ropes; 4. Pile hole excavation and mucking construction: the pile hole is excavated in multiple construction sections from top to bottom by using the full-section excavation method. During the excavation process of each construction segment, the mucking equipment is used to discharge the muck synchronously. The invention has the advantages of simple process steps, reasonable design, low input cost, convenient construction and good application effect, and can simply and quickly complete the construction process of excavation and mucking out of the super-large cross-section inclined single-pile foundation, and the construction process is 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 muck-out 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 small me...

AI Technical Summary

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. Cooperate with the low degree of mechanization, which greatly reduces the construction progress and brings difficulties to the construction; ②Due 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 discharged by rail transportation, and the construction efficiency is extremely low

However, during the excavation of the super-large cross-section inclined single-pile foundation, when the depth of the excavation section is within 30 meters, excavators can be used to cooperate with the excavator. It will also be very difficult to carry out relay excavation with machine cooperation, and the construction of the excavation process is difficult, which greatly affects the subsequent excavation construction process

When rail or continuous belt conveyor is used to extract muck, the blasting operation will cause damage to the track, and factors such as excessive inclination angle and excavation depth of more than 30 meters do not allow the use of track or continuous belt. ballasting

In addition, there are defects such as complicated procedures, high cost, inflexibility, inflexibility, and large construction interference in rail-tracked ballasting and continuous belt machine ballasting.

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