Study on High Precision Positioning of Tunnel Blasthole and Construction Technology of Water Seal Dust Suppression Controlled Blasting
Based on the engineering background of the first construction contract section of longyan mountain tunnel in dongguan section of shenzhen outer ring expressway,this paper carries out technical research,summarizes and refines a set of high-precision positioning of tunnel blast hole and water-sealed dust suppression control blasting construction technology.In the early drilling stage,based on the infrared projection technology,the infrared projection equipment is used to directly project the blasthole layout map compressed into film onto the tunnel face,and then the workers paint the points.The drilling workers perform precise drilling construction according to the position of the paint points.In the tunnel blasting stage,the conventional hydraulic blasting construction technology is improved,and the water-soluble dust-sticking agent is added to the traditional sealing water bag,which significantly increases the dust-sticking effect of the water mist after blasting.The comprehensive application of resin quick-setting plugging agent in barrel plugging can significantly reduce the loss of blasting energy,strengthen its blasting effect and reduce material loss.
tunnel blastholehigh precision positioningwater seal dust suppression controlblasting construction technologyinfrared projection technologywater-soluble dust adhesive
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