A method of demolishing angle steel by blasting without punching

Abstract

The invention discloses a method for demolishing angle steel by blasting without punching. It includes the following steps: Step 1: Make a piece of accessory angle steel that is the same as the angle steel to be demolished by blasting; Step 2: Seamlessly weld the accessory angle steel and the angle steel to be demolished by blasting to form a cylindrical steel beam with a rectangular cross section, and use steel plates and this steel The bottom of the beam is welded seamlessly; Step 3: Cut the pre-crack horizontally on the back of the angle steel to be removed; Step 4: Pour granular medium or concrete into the steel beam along the opening of the upper end of the steel beam, and after reaching a certain height, place a PVC pipe along the steel beam The center of the beam is inserted into the granular medium or concrete, and the granular medium or concrete is poured along the inner wall of the steel beam and the outer wall of the embedded PVC pipe; Step 5: Load the charge along the embedded PVC pipe; Step 6: Detonation. The invention has a high utilization rate of the explosive, and the explosive is packed inside the angle steel, and the flying stones and shock waves generated by the explosion are less harmful and easy to protect.

Description

technical field [0001] The invention belongs to the technical field of engineering blasting, in particular to the technical field of blasting demolition of angle steel structural components and structures, and in particular to a method for demolishing angle steel by blasting without punching. Background technique [0002] When demolishing steel media components or structures by blasting, the structure itself is hollow or even plate-shaped, so it is impossible to drill holes and charge blasting. Only the technology of shaped charge, externally applied charge and welded into a cylinder with concrete blasting can be used. [0003] And above technology has obvious technical defect. [0004] 1. High-intensity and high-velocity explosives are required for the blasting of shaped-energy charges. Most of these explosives are tubular products, which are difficult to realize for civilian use. At the same time, the shaped-energy charges processed by high-intensity and high-explosive vel...

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Problems solved by technology

[0003] However, the above process has obvious technical defects

[0004] 1. High-intensity and high-velocity explosives are required for the blasting of shaped-energy charges. Most of these explosives are tube products, which are difficult to realize for civilian use. At the same time, the shaped-energy charges processed by high-intensity and high-detonation-velocity explosives can only act on the blasting and cutting of plates. That is, it can only cut slits on the steel plate but cannot produce large openings to cause the overall structure to be damaged and unstable

[0005] 2. The blasting of the externally applied charge is close to the object to be demolished, and the working power of the explosive is locally concentrated at the contact point. If it is not close to the object to be demolished, most of the energy of the explosive does not directly act on the object to be demolished, and most of it does useless work, and the resulting explosion shock wave , blasting flying rocks and noise are not easy to prevent and control, and cannot be implemented in complex living and production environments

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