Blasting excavation system for land rock foundation pit and construction method applying same

Abstract

The invention provides a blasting excavation system for a land rock foundation pit and a construction method applying the same. An even wall is arranged on the rock stratum around the foundation pit,the upper ends of anchor bars are integrally connected with reinforcing bars of the even wall, the lower ends of the anchor bars are vertically embedded in the rock stratum, engineering piles are arranged in pile pits of the foundation pit, the pile pits are formed in the rock stratum of the central zone of the foundation pit, anti-collision rubber layers are arranged on and wrap the exposed portions of the engineering piles, embedded drag hooks are arranged on the upper ends of the even wall and the engineering piles, a protection net is fixed to the embedded drag hooks and arranged on a foundation pit opening, a construction platform is arranged on the top ends of the engineering piles, one end of a construction trestle is arranged on the construction platform, the other end of the construction trestle is arranged on the top end of the even wall, vertical blast holes are formed in the central area of the rock stratum of the foundation pit, and inclined blast holes are formed in the area, close to the edge rock stratum, of the foundation pit. The after-digging rock slope reserved through final blasting is dug by adopting a cutter in combination with static blasting to form a natural rock retaining structure, and the lossless connection between the system and the reinforced concrete even wall of the upper portion is guaranteed.

Description

technical field [0001] The invention relates to the field of foundation pit excavation, in particular to an earth-rock foundation pit blasting excavation system and a construction method using the same. Background technique [0002] The development of urban space has gradually shifted from the past mode of mainly expanding around and building a large number of high-rise buildings to the track of focusing on the development and utilization of underground space, because the traditional way of expanding to the surrounding areas of the city will be restricted by limited land resources and Restricted by the current system, the way of developing to high altitudes, building high-rises, constructing elevated roads and overpasses will increase the density of urban space and make the development of urban space gradually move towards a vicious circle. Only the development and utilization of urban underground space can alleviate the prominent contradictions in urban space development wi...

AI Technical Summary

Problems solved by technology

Although sloping excavation is more economical, it is easy to over-excavate and takes up a lot of space, which is not suitable for deep foundation pit excavation, especially for urban deep foundation pit excavation; while the traditional support structure supports vertical excavation, the support structure It is complex and has a large amount of work, and it is also not conducive to the entry and exit of machinery and the transportation of muck and rocks

In addition, more or less flying rocks will be produced during blasting and excavation of rock layers, which will bring risks to engineering personnel and the surrounding environment

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