As a widely utilized non-contact measurement technology

3D laser scanning has gained extensive application in engineering construction due to its inherent advantages of high precision

efficiency

and automation.Based on a practical engineering case from a major underground laboratory project in Sichuan Province

elaborates on the specific applications of this technology in field data acquisition

point cloud processing

model construction

and accuracy validation.By establishing a control network and deploying target balls

multi-station scanning was conducted to capture three-dimensional point cloud data of complex underground spaces.Through processing steps such as registration

noise reduction

and coordinate transformation

a high-precision 3D point cloud model was generated.Furthermore

the multifaceted applications of 3D point clouds in graphic drawing (e.g.

floor plans

cross-sectional drawings) and BIM design were explored

including reverse modeling

collision detection

and spatial optimization

providing reliable foundational data and technical upport for the digital design and intelligent operation and maintenance of underground engineering.The research demonstrates that this technology holds significant practical value and broader application prospects in undergroun spatial measurement.