A Construction Technology of Demolishing Prestressed Continuous Box Girder Bridge by Hydraulic Blasting

Abstract

The invention discloses a construction technology of demolition of a prestressed continuous box girder bridge through hydraulic blasting. The technical scheme adopted by the construction technology mainly comprises the following steps of (1) performing theoretical analysis; (2) performing demolition of auxiliary structures; (3) performing drilling of holes in a top plate; (4) placing a blasting charge; (5)performing water injection into the box girder; (6) protecting the box girder; (7) performing surrounding layout; and (8) performing blasting, and performing clearing and transportation. After the blasting charge is mounted in the step (4), an adhesive layer is sprayed onto the outer surface of the blasting charge; after the water is injected into the box, the adhesive layer recovers theadhesive property when being in contact with the water, so that further enhancement of the stability of the blasting charge on the inner wall of the box is facilitated; a steel wire is used for preliminary fixation of the blasting charge; the adhesive layer is used for performing secondary fixation on the blasting charge; and when the blasting charge is subjected to strong hydraulic impact, the blasting charge cannot be easily blown away from the preset position, so that the blasting charge can explode at the preset position and realization of complete blasting of the bridge can be facilitated.

Description

technical field [0001] The invention relates to bridge demolition, in particular to a construction technique for demolishing a prestressed continuous box girder bridge by hydraulic blasting. Background technique [0002] With the rapid development of our country's economy, the traffic flow of roads has increased rapidly, and the requirements for the use and bearing capacity of existing road and bridge structures are also getting higher and higher. Many bridge structures have been overwhelmed by heavy traffic, and some have exceeded the design. Some bridges have become dangerous due to various reasons, and they are all facing the situation of reinforcement, reconstruction, demolition and reconstruction. For the demolition of bridges in the past, mechanical demolition or drilling and blasting of columns and other parts are often used to perform secondary crushing. This demolition method is difficult to dismantle, causes serious dust pollution, and consumes a lot of manpower an...

AI Technical Summary

Problems solved by technology

[0004] However, this demolition process using hydraulic blasting is to fix the charge on the inner wall of the box in advance, and then inject water into the bridge of the box. Due to the high water pressure, the charge is easily washed away from the predetermined position, causing the bridge to be damaged. partial demolition of