Controlled blasting construction method for rock foundation pit

Abstract

The invention relates to a controlled blasting construction method for a rock foundation pit. The method comprises the following steps: detecting a cutting line; with the cutting line as a reference line, locating the periphery of a foundation pit to excavate a damping groove; vertically excavating a damping groove in the cutting line, wherein the interior of the damping groove is a blasting area and the exterior of the damping groove is a protective area; blasting and excavating the foundation pit: crushing rocks after blasting and removing slag; and cutting and blasting the foundation pit in a layered way: repeating excavation of the damping groove and blasting of the blasting area, excavating the damping groove in a layered way, blasting and excavating the foundation pit until the foundation pit is completely excavated. The damping groove is excavated in the excavating area of the rock foundation pit so as to stop blasting vibration propagation in the excavating area and reduce vibration influences on the rock wall and the surrounding structure of the foundation pit; a cutting reference is randomly corrected by using an outwardly moving rechecking line of the foundation pit cutting line so as to satisfy requirements on foundation pit excavating accuracy; the controlled blasting construction method for the rock foundation pit, provided by the invention, has the advantages of simple process and no damage to a foundation pit surrounding rock structure and is suitable for excavating various earth-rock foundation pits; both excavating efficiency and safety can be taken into account; and the foundation pit blasting safety and the foundation pit excavating accuracy are enhanced.

Description

technical field [0001] The invention relates to a foundation pit construction method, in particular to a rock foundation pit controlled blasting construction method. Background technique [0002] With the further development of the western development, the speed of urban construction is further accelerated. Under the premise of comprehensive consideration of urban functions, landscape requirements, and building safety, the utilization value of the underground space of a number of high-rise buildings and super-limit high-rise buildings is becoming more and more obvious. Expansion, The use of underground space has broad prospects. When the proposed project is located in a complex environment such as adjacent buildings, municipal pipe network, underground civil air defense facilities, underground light rail tunnels, etc., it will make the excavation of rock foundation pits more difficult. Traditional manual chiseling and mechanical excavation of foundation pits are far from me...

AI Technical Summary

Problems solved by technology

Traditional manual chiseling and mechanical excavation of foundation pits are far from meeting the needs of construction. The existing directional blasting technology combined with mechanical excavation of foundation pits can effectively save excavation time and improve excavation efficiency. However, during the blasting process, the blasting Seismic waves are easy to disturb the surrounding rock of the foundation pit, destroying the structure of the surrounding rock, and there are subsequent safety hazards in the surrounding rock of the foundation pit

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