The Renewal of Stormwater Systems Using Trenchless Technologies (2018) / Chapter Skim
Currently Skimming:
Pages 22-33
The Chapter Skim interface presents what we've algorithmically identified as the most significant single chunk of text within every page in the chapter.
Select key terms on the right to highlight them within pages of the chapter.
From page 22... ...
22 Introduction This chapter synthesizes the literature search, questionnaire responses, and interviews to provide a summary of the relative frequency of use, how decisions are made to perform trenchless renewal, how methods are selected, the relative use and satisfaction with the methods, and costs and the degree to which costs are tracked. The questionnaire was sent to all 50 DOTs.
|
From page 23... ...
Current Practice and Experience 23 Figure 10. Experience with trenchless stormwater system renewal (40 state DOT respondents)
|
From page 24... ...
24 The Renewal of Stormwater Systems Using Trenchless Technologies of a study on the structural benefits of concrete paving of steel culvert inverts. One respondent identified the use of internal bands and joint repair as trenchless renewal.
|
From page 25... ...
Current Practice and Experience 25 be considered when reviewing the results. The results may not be representative for the less frequently used methods.
|
From page 26... ...
26 The Renewal of Stormwater Systems Using Trenchless Technologies DOT respondents did not have shareable case studies of unsuccessful application of trenchless renewal methods. Interviews with municipalities and special districts did identify several failures associated with CIPP.
|
From page 27... ...
Current Practice and Experience 27 For respondents that do not have experience with trenchless renewal, the questionnaire asked for the top five reasons for not using it. Table 10 provides an overall rank, where 1 is the highest and 10 is the lowest, for the reasons provided.
|
From page 28... ...
28 The Renewal of Stormwater Systems Using Trenchless Technologies The Minnesota DOT's HydInfra Inventory and Inspection program, which includes data from inspections such as size, shape, material, and condition descriptor, in combination with a related flow chart, can provide a planning-level suggested repair (Wagener and Leagjeld 2014)
|
From page 29... ...
Current Practice and Experience 29 The assessment form illustrates the types of information that is commonly required to identify the potentially applicable trenchless renewal methods. For SL, CFP, spiral-wound liner, CIPP, and SIPP, the Federal Lands Highway manual provides a liner selection matrix with some of the typical applications and advantages and disadvantages, as well as rough comparative costs.
|
From page 30... ...
30 The Renewal of Stormwater Systems Using Trenchless Technologies completed by each respondent is not the same, these responses do not necessarily represent the frequency that the renewal is considered temporary on a project level. The questionnaire asked for a relative percentage of projects where the renewal was considered to be for non-structural reasons.
|
From page 31... ...
Current Practice and Experience 31 The questionnaire asked for one of six frequency categories shown in Table 16 to be selected based on the answers to the proceeding question on which defects were commonly mitigated. Table 16 provides a count of the responses for each category.
|
From page 32... ...
32 The Renewal of Stormwater Systems Using Trenchless Technologies • Rare due to mostly bid items. • Building the pit.
|
From page 33... ...
Current Practice and Experience 33 • Of the DOTs, 24% use only one trenchless renewal method. • Of the DOTs, 55% have experience with two methods.
|
Key Terms
This material may be derived from roughly machine-read images, and so is provided only to facilitate research.
More
information on Chapter Skim is available.