Method for high-notch blasting demolition of thin-wall reinforced concrete chimney

Abstract

The invention relates to the technical field of engineering blasting, in particular to a method for the high-notch blasting demolition of a thin-wall reinforced concrete chimney. The method includes the steps of step 1, determining the collapse direction of the chimney and notch parameters according to the surrounding environment of the chimney, the height of the chimney and a chimney flue; step 2, pretreating a notch; step 3, forming a directional window and a positioning hole; step 4, forming a shot hole in a position where the notch is formed, and conducting charging to set a detonating network; and step 5, blasting the chimney. According to the method for the high-notch blasting demolition of the thin-wall reinforced concrete chimney, a high-position notch mode is used, an upper barrel body is lowered in the dumping process, a lower barrel body is dismantled through gravity, and the dumping coverage range of the whole chimney can be effectively reduced; and when the method is used in construction, the two initial closing angles of the high-notch are accurately controlled to be the same in size by adopting a mode of drilling by a hollow drill, so that the chimney is stressed uniformly and symmetrically, and the controllability of the dumping direction of the chimney is improved.

Description

Technical field [0001] The present invention relates to the field of engineering blasting techniques, and in particular, a method of high-cutting blasting removal of thin-walled steel concrete chimneys. Background technique [0002] High large chimney is a thin-walled structure, and the cross section is a ring shape, has a high diameter ratio, wall thickness and diameter ratio. The height of reinforced concrete chimney dismantled in the past few years is generally around 80m to 150m. In recent years, due to the acceleration of backward production capacity, the chimney to be removed, and the removal example of 180m and 210m high chimney is increasing. [0003] At present, there are many types of methods used at home and abroad, mainly: artificial demolition. Generally, the method of dismantling the chimney structure by the top and bottom and lower hammer, sputum. Mechanical demolition method. This method is mainly to apply a wind, crushing machine, breaking the chimney cylinder, u...

AI Technical Summary

Problems solved by technology

[0005] In the current prior art, as disclosed in Patent Document 1 and Patent Document 2, positioning windows are set at the bottom of the chimney to assist blasting so that the direction in which the chimney falls can be positioned. The development in the middle of the middle part determines the accuracy of the chimney collapse direction to a large extent, which brings uncertainty to the exact direction of chimney dumping, and the existing dumping method still cannot control the dumping length

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