Encouraging Innovation in Locating and Characterizing Underground Utilities (2009) / Chapter Skim
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Pages 51-68
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51C H A P T E R 6 Targeting ImprovementsIntroduction Thus far, the report has described the administrative and technical landscape within which utility locating and characterization efforts must operate. The focus of this chapter is on identifying how SHRP 2 could best encourage and accelerate actions related to improving technological performance and developing systems, procedures, and funding or time allowances that permit the technology to make a significant difference in the planning, design, and construction of highway renewal projects.
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52many cases, information was combined from several sources to form a single case-history description. This section discusses the implications of the case histories on utility locating technologies and procedures that were examined.
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53National Research Council Report: Seeing into the Earth A National Research Council (NRC) Committee of the Board on Earth Sciences and Resources was formed in 1995 with the specific tasks of (1)
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54important tasks include detection of pipeline encroachment and mechanical damage by third parties and pipeline locating and condition assessment. Areas of research that are currently being funded can be found at http://primis.phmsa.
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55by potential benefits and rationalized into 16 proposals for further development after the workshop. The estimated cost of the research identified in all proposals totaled $13.3 million.
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56during manufacture. The particles are 12% to 24% by weight, but only 3% to 4% by volume.
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57penetration for GPR even in problem soils while using signalprocessing techniques and stepped frequencies to enhance signal-to-noise ratios and increase the resolution with which utilities and other buried targets can be identified. Several independently documented field trials have been carried out using this technology, which has shown improved success in identifying buried utilities with high depth-to-diameter ratios or in problem soils such as conductive clays.
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58goals of the research initiative closely mirror those of SHRP 2, it is possible to build complementary rather than duplicative research activities. The aim of the MTU Location Project is to investigate the feasibility of several novel approaches, alongside greatly enhanced approaches, to be combined in a single multimodal approach to locate, identify, and possibly assess the condition of buried assets, whether deployed from the surface or subsurface from within an existing utility conduit.
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59utilities of various sizes at depths exceeding 15 ft to 20 ft through surface investigations. Passive surveys use natural random vibrations and can image the zonation of deeper materials through statistical analysis and inversion techniques.
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60approaches and provide a low signal-to-noise ratio. The close horizontal separation of utilities can be addressed to a certain extent using narrowly focused signals, but the identification of vertically stacked utilities is more difficult.
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61in performance justifies the increase in equipment and operating cost. This, in turn, requires that an increase in performance is properly valued against the risk-based cost of poor detection that may result in project delays, cost overruns, and personal injury.
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62Such devices will tend to be used if available and will enhance the detection of deep utilities and assist in discriminating between braided and stacked utilities. • Technological advances in locating are an ongoing process, but advances are useless in practice until the client considers them to be cost-effective.
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63Of particular interest for development are the technologies that track progressive deformation of pipe cross-sections with time, change in pipe-wall thickness, and the development of soil voids outside a pipe. For cables, fault identification and location are also important.
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64tion and commits to keep records up to date (27)
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65utility information-sharing is expected to be very strong based on realistic concerns about the use of the data. It will need to be shown that a utility company's concerns can be properly addressed before such collaborations can effectively move forward.
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66mapping of underground utilities within highway rights-of-way is the Off-System Bridge Rehabilitation Program (OSBR)
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67other organizations. As a result, nine target research and development activities were identified (including related educational components)
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68address specific issues. The third-highest priorities include the detection of external voids, benchmarking of current technologies, and deformation characterization technologies.
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