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Requests for formal interpretations shall be processed in accordance with Section 7 of ASCE Rules for Standards Committees, which are available at www.asce.org . Errata, addenda, supplements, and interpretations, if any, for this standard can also be found at www.asce.org . This standard has been prepared in accordance with recognized engineering principles and should not be used without the user ’ s competent knowledge for a
given application. The publication of this standard by ASCE is not intended to warrant that the information contained therein is suitable for any general or specifi c use, and ASCE takes no position respecting the validity of patent rights. The user is advised that the determination of patent rights or risk of infringement is entirely his or her own responsibility.
A complete list of currently available standards is available in the ASCE Library ( http://ascelibrary.org/page/books/ s-standards ). These design and construction guidelines for microtunneling have been created by a group of engineers, owners, contractors, suppliers, and manufacturers working over the past several years. The changes to these microtunneling guidelines take into account many of the advances that have occurred since their original publication in 2001. A number of new sections have been added. Many of the existing sections have been updated because of changes in technology as well as changes in construction that make microtunneling a more acceptable means of construction.
Sections have also been expanded and modified so that those reviewing the guidelines can best understand what is needed in detail in order to undertake a microtunneling project. In addition, the methods for preparing construction contract documents, including drawings, technical specifications, and contractual specifications, have been updated. The qualifications of contractors who construct a microtunneling project as well as those of the engineers who design them have been updated. The committee that worked on these guidelines acknowledges that there have been significant improvements in best practices and technology since 2001. No document, including this one, can encompass all of the issues on a particular microtunneling project.
In addition, improvements in best practices and technology continue to evolve so quickly that consideration of these guidelines in connection with any project must take into account not only the specific characteristics of the particular project but also further improvements in best practices and technology. Microtunneling was developed in Japan in the mid-1970s and in Germany in the early 1980s. A common factor that allowed microtunneling’s development in Germany and Japan was the use of equipment in areas of uniform soils, where it could easily be optimized.
(3.8mi) of sewer system installed with microtunneling. The pipe diameters installed were 250, 450, and 525mm (10, 18, and 21in.). The growth of microtunneling has been steady since the 1990s, mainly on projects requiring installations below the groundwater table, with minimal surface disruptions, and through difficult ground conditions. Engineers are increasingly designing projects that require microtunneling methods. These standard guidelines were written and originally published in 2001 to aid in that process.