The International Society for Trenchless Technology

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2011 ISTT No-Dig Award Winners


Category: Project Rehabilitation - Company: Stroitelna Mehanizatsia AD - Country: Bulgaria

Rehabilitation of Water Main in Sofia, Bulgaria

This project is a testimonial to resourcefulness and ingenuity in achieving a successful pipeline rehabilitation result under an extremely tight schedule, and in less than ideal space and climate conditions.

Sofijska Voda, the operator of the Sofia water and sewer system needed to restore a 1,220 mm diameter thin-walled steel water pipeline, which had not been used since the mid 1990s.

The 850 meter project was located in a densely populated residential district with narrow rights-of-way. The project had to be completed within 40 days, without unduly restricting access to residential property, and in temperatures that were routinely well below freezing.

The solution chosen was to install a semi-structural liner using Cured-in-Place Pipe (CIPP). An additional challenge emerged when the contractor discovered the inversion system lacked the capacity to handle some of the sections to be rehabbed.

Not to be deterred, the contractor designed, built and tested a new inversion vessel, mounted it on a heavy-duty truck and had it ready to use in 3 weeks including the Christmas and New Year’s holidays.

The project was completed successfully on time and has won over the customer on merits of trenchless technology

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Category: Project Installation - Company: PBG SA / Hobas Systems Polska - Country: Poland

Czajka Microtunnel Project

Czajka is an outstanding example of a large diameter microtunneling project. The PBG Group installed a large collector system owned by MPWiK-Warsaw located in an urbanized area of Warsaw.

The pipeline system collects waste water previously untreated and transports it to a new waste water treatment plant. The pipe selected for this project was HOBAS CC-GRP (Centrifugally Cast Glassfiber Reinforced Plastic) pipe.

This project established a number of records – world’s largest CC-GRP pipe, length of total project (5,700m) and length of single drive (930m).

The contractor was able to achieve tight grade tolerances (0.55%) and high production rates (36m per day, peak) at lower cost than open cut with minimal impacts on city life and the environment.

Most important, the collector system safely transports effluence for treatment enhancing the quality of the environment in Vistula and Baltic.

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 Category: Product - Company: Hydrascan Limited - Country: UK

Hydrascan Typhoon Pipe Cleaning System

Hydrascan Limited of the United Kingdom developed the Typhoon, a pipe cleaning system that uses water pressure for propulsion and to clean water mains.

The Typhoon cleaning apparatus is introduced into the pipeline from an excavated portion of the pipe. Hydro jets power the Typhoon away from the launch point to a predetermined target area. An onboard valve switches the pressurized water from propulsion mode to cleaning via a radially arranged system of manifolds and fan jets.

The bulk of the water used in cleaning is recycled, solids are removed and the clean water reused in the next cleaning run. The cleaning system is fully adjustable and highly controllable.

It can handle difficult lengths of pipe not easily cleaned using a traditional winched system. The system has a 500m range, requires only one access point and can clean upstream and downstream as well as up to valve faces.




Category: Academic Research & Courses - Name: Professor Baosong Ma - Country: China

Science of Trenchless Engineering Undergraduate and Graduate Course at the China University of Geosciences-Wuhan

Professor Baosong Ma, Executive Director of the China-US Center for Trenchless Research and Development at the China University of Geosciences –Wuhan has established a 40-hour course on the Science of Trenchless Engineering (STE), which is offered to both undergraduate and graduate students.

The course structure includes lectures, laboratories, and tutorials on all aspects of trenchless technology. Since it was establish in 2004, more than 300 undergraduate and 100 graduate students have taken the STE course.

Professor Ma’s Science of Trenchless Engineering course has an outstanding reputation and has contributed to the advancement of trenchless practices in China.

In 2010, the course received awards for academic achievement from the Chinese Ministry of Education and China University of Geosciences-Wuhan.


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Category: Student - Name: Haitao Lan - Country: China

Prediction of Rotational Torque and Design of Reaming Program Using HDD in Rock Strata


Mr. Haitao Lan, a student in the College of Engineering, China University of Geosciences-Wuhan, presents the results of his research to better characterize the predictability of torque requirements and reamer selection in large diameter pipe installation using HDD in rock strata.

Mr. Lan developed a new predictive mode for estimating rotational torque in large diameter HDD operations that included several variables not in existing models. Data from west-east natural gas transmission pipeline projects in China were used to calibrate the model.

The addition of these variables, which included reamer diameter, improved the accuracy of rotational torque estimates, and provided a means for analyzing and selecting the appropriate reamer size for HDD projects with similar geological conditions.

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