Excavation and mucking construction process for tilting type superlarge-section single-pile foundation

Abstract

The invention discloses an excavation and mucking construction process for a tilting type superlarge-section single-pile foundation. The process comprises the steps of firstly, advanced pipe shed support construction; secondly, hole mouth protection, i.e., a hole mouth support structure is constructed at a hole mouth of a pile hole; thirdly, installation of a mucking device at the hole mouth, i.e., the mucking device is installed outside the hole mouth of the pile hole and comprises a left longitudinal travelling frame, a right longitudinal travelling frame, a transverse travelling frame capable of horizontally moving on the two longitudinal travelling frames front and back, a hoisting device capable of horizontally moving on the transverse travelling frame left and right, and a mucking hopper hoisted below the hoisting device through a rope; and fourthly, pile hole excavation and mucking construction, i.e., a full section excavation method is adopted for the pile hole excavation with a plurality of construction segments arranged from top to bottom, and the mucking device is used for mucking synchronously in the excavation process of each construction segment. The excavation and mucking construction process for the tilting type superlarge-section single-pile foundation is easy in step, reasonable in design, low in investment cost, simple and easy to construct, good in use effect and capable of easily and fast completing the excavation and mucking construction process of the tilting type superlarge-section 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 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.

Images