Synthesis of trenchless technologies.

Details

• Creators:
  Burden, Lindsay Ivey ; Hoppe, Edward J.
• Corporate Creators:
  Virginia Center for Transportation Innovation and Research
• Corporate Contributors:
  Virginia. Dept. of Transportation
• Subject/TRT Terms:
  • State of the practice
  • Trenchless technology
  • Excavation
  • Highway safety
  • Construction safety
  • Literature reviews
  • Recommendations
  • Specifications
  • State departments of transportation
• Publication/ Report Number:
  VCTIR 15-R16
• Resource Type:
  Tech Report
• Geographical Coverage:
  Virginia
• Corporate Publisher:
  Virginia Center for Transportation Innovation and Research
• Abstract:
  The purpose of this study was to examine the current state of the practice of state highway agencies regarding methods ; and specifications for using trenchless technologies. From the perspective of the Virginia Department of Transportation ; (VDOT), the paramount concern associated with trenchless construction is the safety of the traveling public. Since such ; construction typically takes place without the re-routing of traffic, any sudden and substantial surface displacement of the ; overlying roadway has the potential for catastrophic consequences. Surface monitoring during and after construction is a critical ; activity to ensure successful installation. ; The study focused on the most commonly used trenchless methods for new construction, including the selection of the ; most appropriate trenchless technology for specific applications, the identification of minimum geotechnical investigation ; requirements, design considerations, construction monitoring, costs, and performance. The study did not address all potentially ; available methods of utility construction and rehabilitation. ; To achieve the study objective, two tasks were performed: (1) the literature on the current state of the practice with ; respect to the use of trenchless technology in other states was reviewed, and (2) identified specifications and design guidelines of ; various state transportation agencies were analyzed and examined for potential applicability to trenchless construction activities ; administered by VDOT. ; The study concluded that trenchless technologies have been widely adopted but design guidelines and construction ; specifications vary significantly. Accurate subsurface characterization is critical to the selection of the most appropriate ; technology for a specific project. Obstructions pose a significant risk for all types of trenchless work. In general, the risk of ; using the directional drilling method increases with pipe diameter. The opposite is usually the case for microtunneling. ; Unguided trenchless methods are suitable only for short drives. Monitoring of trenchless construction is usually limited to ; observations of installation procedures and surface monitoring. For the most part, a high level of expertise is required for ; operators of trenchless equipment. ; The study recommends that VDOT’s Materials Division, Location and Design Division, and Construction Division ; jointly develop and approve the criteria for selection of trenchless technologies. Specific technical recommendations for ; inclusion in VDOT special provisions and the VDOT Materials Division Manual of Instructions are enumerated.
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• Format:
  PDF
• Funding:
  101900
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/28963/dot_28963_DS1.pdf
• File Type:
  [PDF - 540.12 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:a4e0be78c788b8c5f9dd5283ff53f830ea06e81221581c9487a7f67ac8ff0119