Blasting demolition method for cylindrical steel column structure buildings

Abstract

The invention belongs to the technical field of engineering blasting and particularly relates to a blasting demolition method for various cylindrical steel column structure components and buildings, wherein the cross sections of the cylindrical steel column structure components and buildings are shaped like Chinese character 'tian' or 'ri' or are of a square shape. The blasting demolition method is characterized by comprising the steps of (a) pouring concrete 2 in a columnar steel structure 1 to be blasted, (b) maintaining the concrete 2, (c) conducting oxyacetylene metal-cutting and drilling a blast hole 3 in the obverse side of the columnar steel structure 1, (d) precutting a seam 7 in the columnar steel structure 1, (e) determining blasting parameters, charging powder and connecting lines, (f) conducting protection and (g) conducting blasting. By means of effective implementation of the blasting demolition method for the cylindrical steel column structure buildings, the purpose of blasting demolition of the cylindrical steel column structure components or buildings through industrial explosive materials (emulsion explosives) can be achieved, and the blasting demolition method has the technical advantages of being safe, efficient and low in cost compared with a traditional manual demolition means.

Description

technical field [0001] The invention belongs to the technical field of engineering blasting, and in particular relates to a blasting demolition method for various cylindrical steel column structural members and structures with cross-sections such as Tian-shaped, Japanese-shaped, and square-shaped. Background technique [0002] With the rapid development of my country's urban process, steel, as a renewable material, has made rigid structural members and buildings flourish and play a leading role in many fields, especially the cylindrical steel column structure formed by welding I-beam and steel plate It has been widely used in housing construction, oil production platform, corridor, gate, equipment frame, tower crane, blast furnace, heating furnace, cooling bed, transmission equipment, etc. However, due to the late development of my country's steel structure technology, there are many projects launched in the early stage. At present, a large number of steel structure component...

AI Technical Summary

Problems solved by technology

Due to the high strength of steel structure materials, and the complex structure of steel components and steel structures, it is difficult to dismantle

At present, the demolition of steel structures in China is still in the initial stage of manual demolition, with high labor intensity, low work efficiency and high construction risk.

Collapse accidents are prone to occur during the manual demolition process. The residual frame after the accident needs to be demolished, but the accident caused the steel members to hang high and the structure to be unstable. There are no conditions for manual or mechanical demolition, and only blasting demolition can be used.

When demolishing steel dielectric components or buildings by blasting, because the structure itself is hollow or even a plate-shaped material, drilling and blasting cannot be performed. Only the blasting process of externally applied shaped charges can be used, and the blasting of externally applied shaped charges has obvious technical defects.

[0003] 1. Civilian explosives have a low detonation velocity, and the processed shaped charges cannot penetrate steel materials at all

[0004] 2. Military explosives are tube products. At the same time, the shaped charge package processed by military explosives can only be used for blasting and cutting of plates, that is, it can only cut slits on steel plates and cannot produce large openings.

[0005] 3. Externally applied military shaped charge blasting can only cut the seam of "口"-shaped steel columns, but can't do anything about "日"-shaped and "田"-shaped cylindrical structures.

[0006] 4. The blasting of the externally applied charge has a high capacity loss, and the blast shock waves, blasting flying stones and noise generated are not easy to prevent and control, and cannot be implemented in complex living and production environments.

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