Blasting Excavation System of Soil and Rock Foundation Pit and Its Construction Method

Abstract

The invention provides a soil-rock foundation pit blasting excavation system and a construction method using the same. The ground connection wall is arranged on the rock layer around the foundation pit, the upper end of the anchor bar is integrated with the reinforcement of the ground connection wall, and the lower end is vertically embedded. Into the rock formation, the engineering piles are set in the pile pit in the foundation pit, the pile pit is set in the rock formation in the center of the foundation pit, the anti-collision rubber layer is set to wrap the exposed part of the engineering pile, and the pre-buried pull hook is set on the ground connection wall and the engineering pile At the upper end, the protective net is fixed on the pre-buried pull hook and set at the entrance of the foundation pit. The construction platform is set at the top of the engineering pile. One end of the construction trestle is set on the construction platform, and the other end is set at the top of the ground connection wall. In the central area of ​​the rock formation, oblique blastholes are set in the rock formation area near the foundation pit; the excavated rock mass slope reserved for the final blasting is excavated by a cutting machine combined with static blasting to form a natural rock retaining structure, ensuring that it is consistent with the upper part Reinforced concrete ground connection wall non-destructive connection.

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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