Development and Application of Laser Projection Device for Tunnel Blasting Hole
In order to solve the problem of poor hole lofting effect caused by manual rough positioning of blasting holes in tunnel blasting by traditional drilling and blasting method or by using total station to locate a few blast holes,based on laser projection technology,this paper develops a main control chip to control laser unit,beam splitter and grating coordination,so as to realize rapid laser projection of blasting holes,which is verified by field test.Engineering test results show that:The device can project complex graphics to the face of the palm in a point+line combination at one time;When the concave and convex change of the working face is within 20cm,the positioning deviation of each blasting hole is within 3cm,which can meet the requirements of field operation.Compared with the conventional total station lofting,it has considerable advantages in construction convenience,and can be used to standardize the on-site blasting hole lofting operation.
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