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Method for measuring directional blasting collapse time of chimney

A technology of directional blasting and time measurement, applied in vibration measurement, measurement device, vibration measurement in solids, etc., can solve the problem of large time error of chimney collapse, and achieve the effect of simple operation and high measurement accuracy

Inactive Publication Date: 2012-07-04
GUANGDONG HONGDA BLASTING
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for measuring the collapse time of chimney directional blasting to solve the technical problem that the traditional camera method has a large error in measuring the collapse time of chimneys

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  • Method for measuring directional blasting collapse time of chimney
  • Method for measuring directional blasting collapse time of chimney
  • Method for measuring directional blasting collapse time of chimney

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Embodiment Construction

[0018] In the monitoring process of a large number of chimney blasting vibrations, it is found that the collapse vibration of chimneys has the following rules: During the entire collapse process of the chimney from detonation, sitting down to hitting the ground, the vibration speed of hitting the ground is the largest, followed by the sitting down vibration, and the minimum is the blasting vibration; In the direction of chimney collapse, the closer the distance to the top of the chimney is, the greater the impact vibration will be; in addition, the chimney collapse time t(s) has a greater relationship with the chimney height h(m), which is approximately equal to 10% of the chimney height One, namely: t≈h / 10(s). Therefore, in order to accurately measure the entire collapse vibration waveform of the chimney, it is necessary to pay attention to the reasonable arrangement of the vibration measurement points, the reasonable setting of the parameters of the vibration measurement inst...

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Abstract

The invention discloses a method for measuring directional blasting collapse time of a chimney. The measurement method comprises the following steps of: monitoring a vibration waveform along with time variation in the directional blasting collapse process of the chimney; and identifying the directional blasting collapse time of the chimney by searching an integral waveform which can simultaneously reflect two kinds of the most basic information, namely a chimney blasting moment and a chimney grounding moment in a section of vibration waveform record, wherein the chimney blasting moment and the chimney grounding moment are moments corresponding to the maximum value of a wave crest or a wave trough of a waveform nearby the chimney respectively, and the directional blasting collapse time of the chimney is a difference between the chimney blasting moment and the chimney grounding moment. By the method, the technical problem of large measurement errors of the collapse time of the chimney in the conventional image pickup method can be solved.

Description

technical field [0001] The invention relates to a method for measuring the collapse time of chimney directional blasting, in particular to a measuring method for judging the chimney directional blasting collapse time by monitoring the vibration waveform of the chimney directional blasting collapse process changing with time. Background technique [0002] In China, demolition of chimneys by blasting technology has been used for decades. With the continuous improvement of construction technology, chimneys are built higher and higher, and chimneys that need to be demolished by blasting for reconstruction and expansion of power plants are also getting higher and higher. many. In recent years, five chimneys with a height of 210m have been demolished by blasting in China, which was unimaginable a few years ago. Although the chimney demolition technology by blasting has been very mature after decades of development, most of this technology relies on the accumulation of practical e...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H1/12
Inventor 郑炳旭刘翼李战军魏晓林蔡建德
Owner GUANGDONG HONGDA BLASTING
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