Rapid excavation method for suspension bridge tunnel anchor

Abstract

The invention discloses a rapid excavation method of a suspension bridge tunnel anchor. The method is used for blasting excavation of a mountain rock stratum, and comprises the following steps: dividing a first tunnel into a plurality of first sections in advance, equally dividing each first section into a first arc part and a first bottom, and performing two-step blasting excavation on every first section, wherein the first arch part is excavated forwards for M times in sequence according to the inclination angle of the first section, and then the first bottom is excavated downwards for one time; and dividing a second tunnel into a plurality of second sections in advance, equally dividing each second section into a second arch part and a second bottom, and performing two-step blasting excavation, wherein the second arch part is excavated forwards for N times in sequence according to the inclination angle of the second section, and then the second bottom is excavated downwards according to the section of the second section; and M and N are natural numbers, and the second tunnel is communicated with the first tunnel, and the section and inclination angle of the second tunnel are larger than those of the first tunnel. The method is suitable for large-section and large-inclination-angle tunnel type anchors, rapid construction can be achieved, and the construction period is shortened.

Description

technical field [0001] The invention relates to the technical field of design and construction of tunnel anchors of suspension bridges, in particular to a rapid excavation method for tunnel anchors of suspension bridges. Background technique [0002] Due to its excellent spanning ability, the suspension bridge has increasingly become the preferred bridge type for super long-span bridges. It is an ideal bridge type for crossing canyons, rivers and straits. It has very broad application prospects in mountainous areas in my country. The anchorage of the main load-bearing structure of the suspension bridge is also a key part of anchoring the main cable of the suspension bridge. Can be divided into gravity anchors and tunnel anchors. In inland plains and river areas, the anchorage of suspension bridges generally adopts the gravity type; in mountainous areas, the existing tunnel anchors are mostly suitable for setting in hard rock masses with good surrounding rock conditions, and...

AI Technical Summary

Problems solved by technology

[0003] Tunnel anchors are better combined with the engineering geological conditions of the anchor site, but the tunnel anchor of the suspension bridge is a long-span tunnel structure with a large inclination angle and gradually increasing cross-section, and its excavation construction technology is difficult. , but all have become the primary difficulty restricting the construction period due to the slow excavation

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