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Articles

Here you will find the latest articles on UNITRACC.

Jul 24, 2017

Zweckverband Wasserwerke Westerzgebirge

Dr.-Ing. André Clauß

The steady renewal of the “Auer Ring” long-distance drinking water system in the Western Ore Mountains in Saxony – an interim report

Simply for geological and topographical reasons alone, the renewal of a drinking water transport pipeline in the densely wooded region of the Western Ore Mountains is no straightforward undertaking. Thanks to modern piping systems with their highly developed structural design methods, joint technologies and corrosion protection techniques, projects of this kind can be handled without problem. In the case illustrated here, the planning engineers were confronted with a fairly unusual additional challenge in the form of the soft, unbuffered water in the reservoir which, in conjunction with the cement mortar lining of the pipe, can be subject to an inadmissible increase in its pH value in stagnation phases. By using a proven method, endorsed in the DVGW regulations, of applying carbon dioxide gas under pressure in individual sections of the pipeline before acceptance and commissioning it was possible to ensure that the drinking water in the “Auer Ring” always meets the directives of drinking water legislation.

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Jul 19, 2017

S & P Consult GmbH

Dr.-Ing. Dietmar Beckmann

Rehabilitation of large profiles lacking long-term stability

Many large interceptor sewers, predominantly installed under public roads, have been in use for over 100 years. They are made of brickwork or compressed concrete and often show serious damage, so that it would seem that long-term stability can no longer be guaranteed. As an alternative to replacing large profiles, various renovation procedures offer significant advantages with respect to investment costs, environmental protection and urban pollution. Depending on the procedure, it may well be possible to extend the service life, in order to match that of a replacement. However, beforehand, an in-depth study of the current stability and residual load capacity of the existing sewer is required, along with needs-based selection and dimensioning of the rehabilitation procedure. The new standard DWA-A 143-2 serves as a good basis for the necessary static calculations.

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Jun 27, 2017

Tiroler Rohre GmbH - TRM

Ing. Christian Auer

Kanzingbach power station (Tyrol) with a high boost in output – increased security provided by “leak-before-break” fracture mechanics design of turbine pipes

The use of ductile iron pipe systems for penstock pipelines is constantly increasing with the promotion of renewable energy sources. In this area of application the mechanical and technological requirements placed on pipe materials as well as the need for security are considerably higher than for pipes used for the distribution of drinking water. Therefore it is imperative that material modifications are developed to meet these increased demands. This report describes the safety concept (the “leak-before-break criterion), the technical material modifications and investigations necessary for practical implementation which will result in better utilisation of ductile cast iron as a material in high-pressure applications and the particular requirements for both crew and piping systems when laying turbine pipelines in alpine environments. All in all a basket of technical goodies!

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Mar 22, 2017

Ruhr-Universität Bochum

Meike Drießen

Navigating underground

What will happen to the buildings above ground if a tunnel boring machine moves beneath them? Engineers calculate the answer to this question using artificial intelligence.

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Aug 29, 2016

S & P Consult GmbH

Dr.-Ing. Robert Stein

The next generation of Asset Management

STATUS is a stochastic "ageing model" for rehabilitation & maintenance strategy analysis, development and optimisation, which has been successfully applied in Germany for more than 14 years.

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Aug 12, 2016

European Association for Ductile Iron Pipe Systems · EADIPS®/ Fachgemeinschaft Guss-Rohrsysteme (FGR®) e.V.

Dr.-Ing. Jürgen Rammelsberg

The story of drinking water systems through the centuries

The “50th” anniversary issue of the EADIPS®/ FGR® annual journal has been an occasion to look back over the history of 500 years of drinking water transport and distribution. This area of life is inseparably linked to the traditional material of “cast iron”: it has put its stamp on the development of drinking water supply for half a millennium but, with a constant influx of improvements, optimisations and innovations over this timespan, it has nevertheless remained ever young. The cast iron pipe industry, in collaboration with its users, has always managed to keep abreast of the latest state of the art with a modern and sustainable piping system comprising pipes, fittings and valves.

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Feb 23, 2016

DALROD (Uk) Ltd

Bryan Lord

Case study - UV cured lining project wins the day for DALROD

DALROD recently ventured into new pipe-lining territory using, for the first time, UV cured lining on a project for client Peterborough City Council (PCC)

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Jan 28, 2016

S & P Consult GmbH

Dr.-Ing. Robert Stein

Taking curves with confidence

Finding the weakest link and providing new solutions can help reduce pipe damage and increase scope for pipe-jacking projects

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Dec 23, 2015

NIVUS GmbH

General Manager Udo Steppe

Flow Measurement using Cable Lengths of 800 Metres

Challenging application in dam wall requires unusual cable lengths.

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Dec 03, 2015

Herrenknecht AG

Achim Kühn

Mixshield Bärlinde closes east-west gap in Berlin Mitte

Upon reaching its final position at the Brandenburg Gate on 10/14/2015 the Mixshield "Bärlinde" has successfully completed its mission in Berlin. Behind the tunnel boring machine (TBM) are two 1,620 meter long parallel tubes, built through the historic center of the capital.

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Sep 14, 2015

Herrenknecht AG

Achim Kühn

Variable Density Technology: Game Changer for Kuala Lumpur

Kuala Lumpur's karst soil riddled with fissures and crevices is a real challenge for tunnel builders. Herrenknecht, the global market leader in mechanized tunnelling technology, developed for Klang Valley MRT Project in Malaysia´s capital in collaboration with MMC-Gamuda Joint Venture a new type of machine. The Variable Density tunnel boring machine can be operated in four different tunnelling modes and thus perfectly adapted to the different conditions. After nearly two years of tunnelling, in mid-April 9.5 kilometers of tunnel were completed and the new technology had proven itself. A major breakthrough for Kuala Lumpur’s Metro and for mechanized tunnelling in difficult soft ground.

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Aug 11, 2015

Herrenknecht AG

Achim Kühn

Eight TBM ladies set the pace in London tunnel marathon

With the breakthrough of Herrenknecht tunnel borer "Victoria" on May 23, 2015, eight Herrenknecht tunnel boring machines magnificently completed a unique mission at Europe's largest infrastructure construction project. In just three years construction crews from three UK and European consortia navigated the high-tech borers from Schwanau through the center of London. Citizens and politicians are proud of the engineering achievements. 42 kilometers of high quality tunnels have been created under one of the world’s busiest cities. Crossrail will carry an estimated 200 million passengers per year.

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Jul 08, 2015

S & P Consult GmbH

Dr.-Ing. Robert Stein

Evaluation models for the assessment of the structural and operational condition of drain and sewer systems – Part III

This is the third and last part of the technical report series “Evaluation models for the assessment of the structural and operational condition of drain and sewer systems“. It deals with the results of the analysis and the summary of all survey events.

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Jun 05, 2015

S & P Consult GmbH

Dr.-Ing. Robert Stein

Evaluation models for the assessment of the structural and operational condition of drain and sewer systems – Part II

This is the second part of the technical report series “Evaluation models for the assessment of the structural and operational condition of drain and sewer systems“. It is about the advanced evaluation model STATUS Sewer.

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May 06, 2015

S & P Consult GmbH

Dr.-Ing. Robert Stein

Evaluation models for the assessment of the structural and operational condition of drain and sewer systems – Part I

This is the first contribution of a three-part series that deals with the following approach: "Evaluation models for the assessment of the structural and operational condition of drain and sewer systems". It is motivated by the fact that evaluation models serve as helpful tools for an assessment of the current structural/operational condition of a drain and sewer system and for establishing of a benchmark for prioritizing maintenance and rehabilitation activities based on data acquired from inspections of structural/ operational conditions plus possible influencing conditions.

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Jan 07, 2015

SEKISUI SPR Group

Lena Tiedeken

Quality proves its worth

Sewer rehabilitation with SPR™ technology in Budapest, Hungary

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Nov 19, 2014

HOBAS Engineering GmbH

Jessica Maier

HOBAS® XXL Tank DN 3600 Protects Dąbrowa Górnicza Against Floods

In the view of environmental influences and the expansion of urban areas, the issue of flood prevention becomes a key task for urban infrastructure. HOBAS Tanks have become a widely accepted remedy for this problem – such as a 2,410 m³ large retention system DN 3600 that has been installed in Poland in 2014.

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Oct 06, 2014

S&P Consult GmbH

Dr.-Ing. Robert Stein

Using PVC for the rehabilitation of sewers

Since the early 1970s, we have developed from being a prosperity-oriented and throwaway society to become more environmentally aware, though this same society adopts a highly critical attitude towards some real achievements. Why should PVC, of all things, be such a highly controversial material? This is mainly because it has been known, since the late 1980s, that many chloroorganic compounds, such as propellant gas, paint, solvents and plastics are toxic, carcinogenic, genetically harmful and damage the environment. Since then, the Green Party has pushed for the chlorine industry to be phased out. In terms of chemical structure, PVC contains a high proportion of chlorine, which has led to it being caught up in the political crossfire.

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Aug 15, 2014

McCrometer, Inc.

Michelle Pawlowicz

FPI Mag Flow Meter

Next Generation Mag Meter Measuring Flow in a Pump Station

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Jul 30, 2014

Inspection

Pure Technologies Ltd.

What`s in the Numbers?

A Review and Analysis of More than 400 Miles of Force Main Inspection and Condition Assessment Data.

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Jul 24, 2014

Pipe installation

Reinert-Ritz GmbH

Dragisa Dubocanin

Water pipeline from Turkey to Cyprus - 1,600 mm diameter PE 100 pipeline and its flange-technology solution

The use of polyethylene pressure pipelines is gaining ever greater international regard and becoming ever more sophisticated.The reasons are diverse, and include this material‘s excellent resistance to corrosion, the flexibility of PE 100 pipes, and the resultant installation and cost benefits.

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Jul 08, 2014

Lining with pipes

SEKISUI SPR Group

Lena Zemke

NORDIPIPE as pull-in version for trenchless rehabilitation of drinking water pipes

Pilot project with CIPP technology of SEKISUI SPR in Shumen, Bulgaria - The challenges often involved in drinking water rehabilitation projects are the available time window, residual flow capacity after the rehabilitation, diameter and length to be renewed. Other factors are the capacity to negotiate bends and local contruction site conditions.

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Jun 16, 2014

Shafts and excavations

Herrenknecht AG

Raise Boring Rigs for shafts up to 2,000 meter depth

With growing demand for raw materials, mines are applying increasing effort and expense to open up deep and difficult to access resources. With this in mind, the new Herrenknecht product portfolio of Raise Boring Rigs allows the optimal drilling of shafts with larger diametersat depths of up to 2,000 meters. In the new and further development of Raise Boring Rigs, Herrenknecht draws on proven technologies and components as well as on extensive knowhow in the area of mechanized tunnelling technology.

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Mar 28, 2014

Trenchless installation of pipelines

Herrenknecht AG

Achim Kühn

HDD long distance record in Scandinavia

Top performance at minus 27 degrees Celsius

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Nov 22, 2013

Jacking by machine

The Robbins Company

Dean Workman

Continuous Conveyor Design in EPB TBM Applications

While continuous conveyors have become the muck removal system of choice in long, hard rock TBM tunnels, they have gained acceptance in soft ground tunnels only recently. Soft ground, EPB TBM-driven tunnels provide a challenging environment for continuous conveyors due to the variety of materials present. The design of both horizontal and vertical soft ground conveyors will vary depending on the types of excavated material, amount of water present, and other factors. This paper will address the challenges of effective conveyance in different ground materials by analyzing conveyor performance in several recent EPB TBM projects.

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