Controlled blasting and protecting method for major bridge foundation on two sides of high and steep gorge in scenic spot

Abstract

The invention discloses a controlled blasting and protecting method for a major bridge foundation on the two sides of a high and steep gorge in a scenic spot. The controlled blasting and protecting method comprises the following steps that railings are arranged on the slope surface and in a valley below a blasting position of a the gorge for protection; a protective shed is arranged above a river; a protective channel is arranged at a tunnel exit; a side slope portion which is located above a major bridge foundation pit top surface platform and is in the shape of an oblique cone is blasted, the side slope portion is divided into a first blasting area and a second blasting area in sequence from top to bottom, the first blasting area and the second blasting area are blasted layer by layer from top to bottom, residue removal is conducted after blasting, and then the major bridge foundation pit top surface platform is obtained; and deep foundation pit basic rock layered blasting excavation is conducted on the major bridge foundation pit top surface platform, the rock mass on the blasting portion is covered with covering materials during blasting, supports are arranged on the pit wall after residues generated when each layer is blasted are removed, and construction is completed after the designed elevation is reached through excavation. According to the controlled blasting and protecting method, a three-dimensional multi-component protecting system is designed and established, any influences on the scenic spot in the blasting construction process are avoided, and a new idea of converting passive protection into active protection is provided.

Description

technical field [0001] The invention is used in the technical field of bridge construction, and in particular relates to a controlled blasting and protection method for bridge foundations on both sides of a high and steep canyon in a scenic area. Background technique [0002] In the construction of the bridge across the Grand Canyon, the main span of the bridge spans the drifting area of ​​the Grand Canyon, with high and steep walls on both sides, forming an inverted "V"-shaped ridge. The distribution of rock and soil mainly includes expansive red clay, gravel soil, and white clouds. Limestone is interspersed with greywacky shale layers, the rock mass karst is weakly developed, and the vegetation on the surface of the mountain is lush. The Grand Canyon Scenic Spot is a national 4A-level scenic spot. During the rafting peak season, there are more than 1,000 drifters per day. The construction of the main bridge of the bridge needs to cross the core area of ​​the scenic spot. T...

AI Technical Summary

Problems solved by technology

[0004] 1) The construction blasting area is located on the steep slopes on both sides of the canyon, the construction site is narrow, and the lower part is a national key tourist area, so large-scale blasting construction is not allowed;

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