Static blasting demolition method for concrete support in foundation pit
New technology: O2 rock demolition system
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For urban areas, huge shock waves will cause great safety hazards to the surrounding tall and crowded buildings, flying stones will endanger the personal safety of pedestrians on the streets, and dust will bring great inconvenience to the lives of urban residents. Although with the continuous development and application of modern science, urban controlled blasting technology has been widely used, the impact of vibration, impact, flying stones, etc. caused by controlled blasting on the surrounding area has not been completely eliminated, and the distance from adjacent buildings is almost zero, and blasting construction cannot meet the control requirements. Therefore, under the current conditions, it is necessary to find another way to control, that is, to use static blasting construction technology.
1. Scope of application
Applicable to the demolition and disintegration of concrete, reinforced concrete structures, foundations, demolition of downtown buildings and mining of precious stones.
2. Process principle
Static blasting is the use of static crushing agents to cut and crush concrete. Static crushing agent is a powdered construction material that can break rocks and concrete without using explosives. Its main component is quicklime (i.e. calcium oxide), and it also contains some compound catalysts mixed in a certain proportion. It is a new, environmentally friendly, non-explosive construction material popular internationally.
Static blasting is to use the static crushing agent installed in the medium borehole to add water to produce a hydration reaction, which causes the crushing agent crystals to deform and expand in volume, thereby slowly and quietly applying expansion pressure (up to 30MPa-50MPa, the maximum experimental value can reach 120MPa, and the tensile strength of concrete is generally 2-6MPa) to the hole wall. After a period of time (12-24h), it reaches the maximum value and breaks the medium.
