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Design and Construction of Microtunneling Projects

Select suitable investigation techniques and investigate and analyze ground conditions for microtunneling Provide firm data to assist in making informed decisions regarding microtunnel equipment selection, microtunnel lining selection and shaft construction methods Develop techniques to mitigate anticipated and unanticipated microtunneling problems Develop microtunnel Prequalification, specifications and construction schedules more accurately Understand the microtunneling process better and how to monitor microtunneling projects and interpret the data Manage and risk mitigate microtunnel construction projects more successfully and safely You will have the opportunity to discuss case histories and to discuss particular concerns or project

Purpose and Background:

Significant technical advances and increases in the utilization of microtunneling have occurred in North America in the past decade permitting the installation underground of small/medium diameter pipes in virtually all ground conditions with the minimum of surface disturbance. Microtunneling techniques, while becoming increasingly wider in their range of application and diameter range, do incorporate many of the complexities of modern large diameter tunnels including the challenges of technically demanding tunneling. This course is specifically tailored for those interested in microtunneling and will describe the technique in depth together with comparisons with other trenchless techniques such as horizontal directional drilling etc. The course will provide an in-depth review of Microtunneling including all its aspects. Techniques for subsurface investigation and characterization and how these are best applied to microtunneling will be discussed. The course will review how this sub-surface information is then used in designing, specifying, planning, and costing for microtunneling projects. The selection of an appropriate microtunneling technique (auger, slurry or EPB) and tunneling systems (such as various pipe materials or segments in various ground conditions), will be discussed, as well as the set-up and configuration of the tunneling equipment for each project. The seminar will examine the selection, sizing, and construction of various shafts for tunneling, and key aspects of microtunnel design, specification, planning, monitoring and management, including risk assessment and management. New trends and the state of the art in microtunneling also will be discussed. Case Histories and Group Discussion: The seminar will include a number of relevant short videos and several microtunneling case histories. It will provide practical applications and group involvement and discussion of the various techniques discussed together with relevant course materials to be retained by the attendees. A list of suggested reading will also be provided.

Who Should Attend?

Sewer, storm water and utility managers, construction and project managers, engineers (both field and design office), construction supervisory personnel, construction cost estimators, graduate civil or geotechnical engineers and individuals in the construction industry including contractor's personnel wanting a firm grounding in modern microtunneling techniques and practices.

To register your group of 12 or more, call John Wyrick at 703.295.6184

Design and Construction of Microtunneling Projects

Summary Outline:


1. Introduction to Microtunneling and its role in underground construction ­ Seminar overview ­ Participants background ­ A brief historical overview ­ A brief review of all trenchless techniques, HDD, pipe ramming etc in comparison to microtunneling ­ Review of microtunneling and principal uses 2. Sub-Surface Characterization in Soil and Rock for Microtunneling ­ Geotechnical site investigation for microtunneling ­ Characterization of soils for microtunneling ­ Characterization rock mass for microtunneling ­ Soil and rock permeability ­ Interpretation of site investigation data for microtunneling 3. Microtunneling Methods ­ Definition of microtunneling ­ Face support,settlement & minimum cover ­ Equipment selection criteria auger/slurry/EPB ­ Auger microtunneling ­ Slurry microtunneling ­ EPB microtunneling ­ Use of bentonite in microtunneling ­ Ground excavation capabilities ­ Rock excavation in microtunneling ­ Rational for cutter head configurations and overcut ­ Case histories 4. Microtunneling Techniques ­ Microtunneling system manufacturers and selection ­ Site layouts and size requirements ­ Launching and recovery of microtunnel systems ­ Jacking systems ­ Jacking force prediction and monitoring ­ Lubrication for microtunneling ­ Planning for and use of interjacks ­ Alignment control ­ House connection/pilot pipe systems ­ Special features ­ Case histories 7.Planning, Productivity & Costing for Microtunneling ­ Development of projects ­ Key aspects of planning for microtunneling ­ Planning and equipment selection ­ Drive lengths and depth capabilities ­ Productivities ­ Cost and costing for microtunneling ­ Case study 8. Microtunneling Prequalification, Specifications, Submittals & Monitoring ­ Contract documents for successful microtunneling ­ Dispute mitigation and resolution measures ­ Prequalification for microtunneling ­ Specification for microtunneling ­ Submittals for microtunneling ­ Operational monitoring data acquisition and reporting ­ Site staff training


9. Microtunnel Planning, Management Risk and Safety ­ Site investigation ­ Conceptual planning ­ Key planning issues ­ Risk identification mitigation and management ­ Environmental concerns ­ Operation Safety 10. Potential Problems in Microtunneling & Shaft Construction ­ Groundwater control ­ Excavating and dealing with obstructions ­ Cobbles boulders & hard rock ­ Microtunneling in very soft ground and wood ­ Mixed face microtunneling ­ Operational concerns ­ Ground improvement methods and ground freezing ­ Issues concerning long drives ­ Case histories 11. New Developments, Trends and Techniques in Microtunneling ­ New trends in site investigation techniques ­ Excavation techniques and capabilities ­ Modern high capability microtunneling systems ­ Soil removal and separation ­ Curved microtunneling ­ Long drive capability ­ New technical developments ­ Retractable machines and other special techniques ­ Pipe arch microtunneling ­ Lake taps Plus specifically relevant case studies and videos Group participation in discussion of case histories and attendees' particular concerns or projects


5. Jacking Pipe and Segmental Linings for Microtunneling ­ Jacking pipe types ­ Key factors in selecting jacking pipes ­ Jacking pipe & lining capabilities & performance ­ Jacking pipe specification ­ Special jacking pipes ­ Use of segmental linings in microtunneling ­ Segment specification 6. Shaft Construction for Microtunneling ­ Review of available techniques and their suitability ­ Shaft sizing for microtunneling ­ Rib & lag & steel supports ­ Sheet piles ­ Jet grouting ­ Caissons ­ Slurry walls ­ Ground freezing ­ Case histories

Design and Construction of Microtunneling Projects

Topics Covered:

­Sub surface

site characterization in soil and rock for microtunneling: A review of the techniques for investigating and characterizing subsurface conditions for both soils and rock will be presented and particularly how these are applicable to microtunneling. ­Microtunnel methods used in construction: The various types of microtunnel systems available will be discussed in detail for both soft and hard ground conditions including microtunneling capabilities to deal with boulders, obstructions and hard rock. Auger, slurry and EPB type microtunneling systems will be discussed as well as a review of current microtunneling cutter head and stone crushing capabilities. ­Microtunneling techniques: Actual tunnel construction methods using microtunneling and pipe jacking techniques will be examined in detail with a review of the state of the art for the technique. Site layouts and planning for microtunneling in various soils types, alignment control and tolerances, jacking forces and the use of interjacks are included. Frequent practical examples will be given. ­Microtunnel jacking pipes and segmental linings: The types of jacking pipes available for microtunneling will be presented together with a review of their appropriate use. The use of segmental linings in microtunnels will also be covered. Key factors in selecting and specifying microtunneling linings will be addressed. ­Shaft construction for microtunneling: A discussion of shaft construction techniques their selection and merits in various ground conditions and shaft depths. ­Planning, productivities and costing for microtunneling: Project development, planning and productivities including key factors for microtunneling will be discussed, as well as shaft locations, drive lengths and the development of cost levels for microtunneling projects. ­Microtunneling prequalification, submittals, operational monitoring and safety: Required prequalification, specification and other key elements of contract documents for microtunneling together with required submittal information from contractors will be discussed in detail. Recommended monitoring of microtunneling will be described and the interpretation of such acquired data and training of site staff will be reviewed. ­Microtunnel management, risk and safety: Key aspects of the management of microtunneling projects will be discussed including risk identification, both technical and commercial risk mitigation measures, and safety requirements. ­Potential problems in microtunneling and shaft construction: Problems encountered in the design and construction of microtunnels will be reviewed. The means for identifying potential problem areas on projects and suitable mitigation techniques will be described including case studies. ­New developments trends and techniques in microtunneling: New trends in microtunneling and potential future developments will be described as well as the state of the art. ­Videos of microtunneling in action and case histories: Relevant short videos of the various techniques as well as numerous case histories will be presented.

Seminar Instructor:

DAVID G.ABBOTT, P.E., has a B.Eng. degree from Liverpool University in England in civil engineering and is a registered professional engineer throughout Europe. He is a Principal with Jason Consultants. He has over 34 years of experience in construction and has been actively involved in the design and construction of tunneling, pipe jacking, microtunneling, and other forms of trenchless technology for many years. His international experience is extensive having worked in Europe, SE Asia, North, South and Latin America. David is a well-known speaker at North American and international tunneling and trenchless technology conferences and seminars and he has presented more than 30 papers at various forums and conferences in many countries. He has also written numerous articles for technical journals and is a technical advisor on the recent ASCE Utility Tunneling Video. His expertise covers all aspects of project development from project evaluation and feasibility study through conceptual and detailed engineering to equipment selection, project construction and operation management. Since 1983, he has been involved with more than 300 tunneling, pipejacking, and microtunneling, projects.

All of ASCE's seminars are available for on-site presentation. Bringing a program in house for groups of 12 to 15 or more people can reduce your per person costs by more than 25% and your total training costs by up to 50%. For details regarding on-site training and/or needs-based training opportunities only, please contact: John Wyrick, Manager, On-Site Training Worldwide ASCE Continuing Education 1801 Alexander Bell Drive Reston, VA 20191-4400 Tel.: 703-295-6184 Fax: 703-295-6144 Email: [email protected]


Microsoft Word - Microtunneling

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