Condition assessment of corrugated steel underpasses including three-dimensional terrestrial laser scanning

Buried Corrugated Metal Structures (BCMS) offer an efficient form of construction for road crossings and consequently over the years a number have been installed on the New South Wales (NSW) road network. Roads and Maritime Services NSW currently have approximately 70 BCMS with spans in excess of 6 m. Roads and Maritime Services, Hunter Asset Management Division has recently undertaken a detailed assessment of six BCMS in the region. The structures range in span from 3.2 m to 11.5 m and accommodate local road, fauna, and pedestrian movements. The structures are all multi-plate construction and are either arches or horizontal elliptical tunnels. Detailed inspections of the existing structures were undertaken including extensive ultrasonic thickness testing of the exposed plates. This information was then used to inform PLAXIS soil structure modelling to assess stresses in the structures. Remedial options were then developed. Three-dimensional terrestrial laser scanning was also undertaken for each of the structures. The point cloud data from the scanning was used to assess structure geometry and serves as a baseline for ongoing monitoring of deformation and corrosion. This paper will focus on the investigation methodology and findings. In addition, practicalities and benefits of three-dimensional laser scanning will also be discussed.

Language

  • English

Media Info

  • Pagination: 22p
  • Monograph Title: 9th Australian Small Bridges Conference, Surfers Paradise, Queensland, 1-2 April 2019

Subject/Index Terms

Filing Info

  • Accession Number: 01714761
  • Record Type: Publication
  • Source Agency: ARRB Group Limited
  • Files: ITRD, ATRI
  • Created Date: Aug 26 2019 11:34AM