Prefabricated grooves for reinforced concrete support beams in deep foundation pits to be demolished by blasting

Abstract

The invention relates to a prefabricated groove for a deep foundation pit reinforced concrete support beam to be subjected to blasting demolition. The technical scheme is as follows: a prefabricated groove (2) for blasting demolition is excavated in bed rock (3) just below the deep foundation pit reinforced concrete support beam (1) to be subjected to blasting demolition; the longitudinal central line of the prefabricated groove (2) for blasting demolition is parallel to the longitudinal central line of the deep foundation pit reinforced concrete support beam (1) to be subjected to blasting demolition; and the longitudinal central line of the prefabricated groove (2) for blasting demolition and the longitudinal central line of the deep foundation pit reinforced concrete support beam (1) to be subjected to blasting demolition are located on the same vertical plane. The cross section of the prefabricated groove (2) for blasting demolition is in the shape of an inverted trapezoid, wherein the top width a1 of the inverted trapezoid is equal to a+Delta a1, the bottom width a2 of the inverted trapezoid is equal to a+Delta a2, and the height b1 of the inverted trapezoid is equal to Delta b; and the length L1 of the prefabricated groove (2) for blasting demolition is equal to L+Delta L. The prefabricated groove disclosed by the invention has the characteristics of being convenient and fast to construct, good in blasting crushing effect, low in unit explosive consumption and low in blasting vibration intensity.

Description

technical field [0001] The invention belongs to the technical field of blasting demolition pretreatment of reinforced concrete support beams in deep foundation pits. In particular, it relates to a prefabricated groove for demolishing reinforced concrete support beams in deep foundation pits to be blasted. Background technique [0002] With the continuous development of urbanization, various large-scale deep foundation pits have also increased, and the amount of removal of support beams in deep foundation pits has also continued to increase. At present, the support removal methods mainly include the following: manual pneumatic pick removal method, static crushing method, large-scale mechanical (pick machine) removal method, blasting removal method, etc. Manual pneumatic pick demolition has a long construction period for a large number of reinforced concrete components with large cross-sections; static crushing has a poor crushing effect on concrete with high reinforcement co...

AI Technical Summary

Problems solved by technology

However, when the blasting method is used to demolish the reinforced concrete support beams, if there are no reasonable blasting demolition pretreatment measures, careful design and construction, and strict protective measures, strong negative effects of blasting will be produced, endangering the foundation pit itself and its neighbors. Stable buildings may even lead to personal safety accidents and huge economic losses

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