Cofferdam blasting demolition method based on combination of variable linear density charging and digital electronic detonator

Abstract

The invention provides a cofferdam blasting demolition method based on combination of variable linear density charging and digital electronic detonators. According to the cofferdam blasting demolition method based on the combination of the variable linear density charging and the digital electronic detonators, blasting demolition is successfully carried out on the cofferdam by researching the surrounding environment of a blasting area and a blasting scheme and adopting a digital electronic detonator detonating network and variable linear density charging method, the expected effect can be achieved through the method, safety of permanent buildings is guaranteed, and reference significance is achieved for similar blasting engineering.

Description

technical field [0001] The invention belongs to the technical field of water conservancy and hydropower cofferdam blasting, and in particular relates to a cofferdam blasting demolition method based on the combination of variable linear density charge and digital electronic detonator. Background technique [0002] Water-retaining cofferdams are common structures in water conservancy and hydropower projects. Most of them are temporary enclosure structures. After their functions are fully utilized, they are generally demolished by blasting. The Wenzhai Navigation-Power Project adopts the diversion method of segmental cofferdams. The cofferdams are mainly composed of horizontal earth-rock cofferdams and vertical concrete cofferdams. The upstream gravity-type concrete cofferdam is 80m long (0-000~upper 0-080) , The discharge sluice section and the inverted "T" concrete longitudinal cofferdam are 68m long (0+000~bottom 0+068), and the downstream gravity concrete cofferdam is 100m ...

AI Technical Summary

Problems solved by technology

However, it is mainly suitable for the demolition of underwater earth-rock cofferdams, and cannot be well applied to the blasting of concrete cofferdams above water.

[0004] Disclosed in CN 110906819 A is a cofferdam blasting method that reduces water body damage, by setting a corresponding buffer zone within the blasting range, and setting a buffer device in the buffer zone as a protection measure during the blasting process to effectively block the bottom of the explosion The impact force that produces, but it can only be applicable to small area, the blasting demand in small range, can't set buffer zone for the cofferdam blasting of large quantity, and practicability is poor; A kind of reinforced concrete water retaining enclosure is disclosed in CN 108362180 A Water shock wave protection method for blasting demolition of weir anti-seepage piles, which precisely controls the blasting process by controlling the amount of explosives and setting wave baffles, and then achieves the purpose of protecting surrounding buildings

However, it can only be applied to occasions where the location of the building and the cofferdam are relatively far away, and the installation of wave baffles requires a large amount of construction

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