News and Articles
Nov 14, 2007
Article
Cement Mortar Lining - A method of refurbishment for the long-lasting preservation of the piping infrastructure
Our supply and distribution piping systems have suffered in recent years from a lack of investment. Now the supply utilities see themselves, in addition, exposed to further burdens as a result of increasing demands caused by the deregulation of the market. The consequences: an excessively low rate of reinvestment and the concomitant obsolescence of the existing mains.
more
Nov 12, 2007
News
World premiere for Herrenknecht Direct Pipe: culvert underneath the Rhine River near Worms (Germany) realized in only 13 days.
Herrenknecht has developed a new method called Direct Pipe, which combines the advantages of the established Microtunnelling method and Horizontal Directional Drilling technology. A string of prefab pipes is pulled in with only one step. SONNTAG Baugesellschaft mbH & Co. KG used the new Direct Pipe method to lay a 464m long steel casing for a water pipeline as well as power and telecommunication cables beneath the Rhine River near Worms (Germany). Breakthrough occurred only 13 days after the beginning of the construction work.
more
Nov 08, 2007
News
WEFTEC.07 is the largest event in the conference's 80-year history
Record-setting numbers of 19,929 attendees and 1,017 companies using 268,405 net square feet of floor space have designated WEFTEC.07 – the Water Environment Federation’s 80th Annual Technical Exhibition and Conference – as the largest event in the conference’s 80-year history. The previous exhibition records of 965 companies and 245,155 net square feet of floor space were set at WEFTEC.06 in Dallas and the previous attendance record of 18,704 was set at WEFTEC.02 in Chicago, the host city for next year’s conference.
more
Nov 06, 2007
Article
Giant seals help protect St. Petersburg from flooding
St Petersburg is regarded as Russia’s cultural capital. To protect its people and cultural treasures from flooding, a 25-kilometer storm flood barrier is being constructed. An essential part of this structure are 40 meter-wide, seven meter-high seals, from Trelleborg.
more
Nov 05, 2007
News
New sewers to end flooding misery for Lambeth homes
More than 400 homes and business in Lambeth (England) will be protected from the misery of flooding sewers, under a multi-million pound scheme proposed by Thames water to upgrade the area's sewer network.
more
Oct 30, 2007
News
Grundoburst 1250 G in Warsaw, Poland
In the old historical part of Warsaw in Poland a ND 400 mm clay pipe required replacement over a length of 30m. Inspection of the mains by the Warsaw water and sewerage company showed regular sand on the bottom of the mains, so that it was apparent that the main was fractured and debris was falling to the bottom of the pipe. This presented a permanent problem of road surface subsidence – an imminent danger to the public. The problem could have been confirmed by an internal pipe inspection but this could not take place because the camera simply could not pass through the sand and other debris lying at the bottom of the pipe.
more
Oct 26, 2007
Article
Real 'close fit' rehabilitation of large sewers by GIPP
As published in the September 2007 issue of Trenchless Technology International magazine Nowadays sewer network owners and operators are faced with a huge number of different trenchless methods, materials and suppliers to seal and rehabilitate their pipes. This applies especially for cross sectional pipe dimensions up to approximately 1000mm (40”) I.D.. Above that size the number of approved systems and qualified installers reduces to a comparably small amount.
more
Oct 24, 2007
News
Gotthard Base Tunnel: breakthrough in west tunnel between Sedrun and Amsteg
Squeezing rock conditions successfully overcome
more
Oct 22, 2007
News
Robbins hybrid EPBM a versatile solution for Istanbul sewer
A 3.1 m (10.2 ft) diameter Robbins Hybrid EPBM in Istanbul, Turkey can bore in two very different situations. The hybrid machine can switch between hard rock and EPB modes, making it ideal in mixed ground conditions. The bored tunnel will be used to help clean up a sewer system for over 250,000 people living along Istanbul's Beykoz coastline at the Bosphorus. NTF Construction Company will bore two mixed ground tunnels of 4.1 km (2.5 mi) and 3.0 km (1.9 mi) in length with the hybrid machine.
more
Oct 19, 2007
Article
Helium tracer-gas leak detection - Implemented during the normal operation of the pipeline without interruption of the supply
Leakages occur quite frequently in district heating system, especially in older units. Increasing loss of water and damage to the district heating pipeline network will be a consequence long before the leakage can be noticed on the surface. Locating and repair of such leaks is therefore a difficult task. The repair costs in urban pipeline network systems are determined to a Iarge extent by the necessary excavation work. It is therefore important to accurately determine the Iocation and size of a leak. In co-operation with Fraunhofer Institute, DELU has developed a leak detection method which works without interrupting the supply line.
more
Oct 18, 2007
News
Sea Outfall Saint-Jean-Cap-Ferrat realized under limited space conditions
The modernization of the sewage system of Saint-Jean-Cap-Ferrat (Côte d’Azur) in France included the installation of a 110m long Sea Outfall pipeline. The construction company RPS mastered the narrow access routes, limited space conditions and unstable geology using a mobile Herrenknecht Crawler Rig HK150C.
more
Oct 16, 2007
News
Award winning new sewer sealing gel development
In support of Wessex Water’s Sustainable Sewer Renovation Programme, De Neef UK and Sdi-unistride (in association with Wessex Engineering & Construction Services [WECS]) have announced the latest generation of pipe joint injection sealing gels, SewerSeal JF.
more
Oct 15, 2007
News
Sweeter smell of success
An environmentally friendly project by Southern Water that uses only natural elements like bark, wood chips, seaweed and seashells lining water-filled tanks, is reducing the smell generated by wastewater treatment works.
more
Oct 12, 2007
Article
HSP ? Herrenknecht Separation Plants: separation plants for microtunnelling, pipe jacking and associated applications
In the past, it has been proven time and time again that separation is a vital and sensitive integrative module in the use of tunnel boring machines with hydraulic slurry systems. The separation plant separates the slurry suspension components – solids and liquid – in order to re-provide the slurry circuit with the supporting medium and to make the separated solids disposable. Hydraulic transportation is, however, limited by the concentration of the solids and by grain size. Only an efficient separation can guarantee high performance rates. Insufficient separation obligatorily leads to difficulties regarding the removal of the material from the tunnel face to the separation plant above ground, ensuing downtimes and reduced output.
more
Oct 10, 2007
News
West Ham to benefit from Thames Water’s largest new sewer scheme
Thames Water will soon begin work on its most ambitious new scheme to protect Londoners from repeated sewer flooding. The £64m scheme, which is planned for West Ham, will help protect hundreds of homes and businesses from floods like those seen in July.
more
Oct 08, 2007
News
Northwest Chapter to Celebrate its 10th Annual Trenchless Technology Symposium in Calgary
The NASTT-Northwest (NASTT-NW) Chapter is celebrating the tenth anniversary of its Alberta Trenchless Technology Symposium, Nov. 15, at the Coast Plaza Hotel and Conference Centre in Calgary, Alberta, Canada. The Calgary section of the NASTT-NW Chapter is organizing the event.
more
Oct 05, 2007
Article
Stress corrosion cracking of polyethylene - practical examples of steel pipe coatings
This paper describes various forms of stress corrosion cracking in polyethylene and discusses them on the basis of practical examples of polyethylene steel pipe coatings. The study was made possible by targeted localization of coating holidays using various methods of cathodic corrosion protection (CCP) and the following subsequent examinations of the damages and especially the change of material properties.
more
Oct 04, 2007
News
Robbins TBM a repeat record-breaker
A Robbins 7.2 m (23.6 ft) diameter TBM operating on the remote Kárahnjúkar Hydroelectric Project in Iceland has entered new territory. The machine, operated by contractor Impregilo SpA, beat its own world record for the second time when it bored 115.7 m (380 ft) in 24 hours on August 25, 2007. It then set another record in its size class of 7 to 8 m (23 to 26 ft) by boring 428.8 m (1,400 ft) in one week! The previous record was also held by a Robbins TBM that excavated the TARP Project in Chicago, Illinois, USA.
more
Oct 02, 2007
News
Insituform ready to respond to global water crisis
Industry survey cites years of neglect and underinvestment driving “Tidal Wave of Demand” for water infrastructure technology
more
Sep 28, 2007
Article
1500 mm diameter main sewer line renovated under sports ground - Use of the Rib Loc Rotaloc spiral wound liner system
A 1500 mm diameter main sewer line in the town of Tiel in the Netherlands was renovated along a length of 626 m by KMG Benelux B.V. using the Rib Loc Rotaloc spiral wound liner system. The location of the pipe beneath a soccer pitch, the length, dimension and condition of the pipe combined to produce an unusual challenge, which was successfully mastered using the Rotaloc method. Advantages of the SWO liner system, such as high static load-bearing capacity, uniformly high quality of the prefabricated liner material, the avoidance of cost-intensive open cut activities, rapid installation, relatively little expenditure on over-pumping and lack of styrene emissions were all positive factors in the success of this project. In recent years, the town of Tiel in the Netherlands has carried out several rehabilitation measures using the cured in place liner method. In April 2006, it issued another invitation to tender for a sewer renovation. The decision was made in favour of the Rib Loc Rotaloc method. KMG Benelux was able to beat the competition in terms of both price and technology with this special proposal.
more
Sep 25, 2007
News
Grundopit - accuracy beyond doubt
TT-UK Ltd were recently approached to assist with a trenchless solution to install 110mm OD gravity lateral connections on a new sewage scheme. Site constraints included 1050mm diameter concrete rings and 600mm square manhole covers. The biscuits and lids were already installed. The proposed installation procedure was to open trench. Even though this was a rural location this caused some disruption and took approximately four days to complete an average 12m crossing. Due to the lateral having a gravity requirement the most crucial constraint was the accuracy of installation over the entire length.
more
Sep 21, 2007
News
57 new trainees and cooperative education students start working with Herrenknecht
In September and October 2007, 57 young women and men start their careers doing an apprenticeship or cooperative education program with Herrenknecht AG. Currently, Herrenknecht trains a total of 137 junior employees. Compared with last year, this represents an increase of more than 20 %. For Herrenknecht, recruiting trainees and cooperative education students has proven to be a reliable solution in order to shape prospective qualified labor for the industrial, technical and administrative divisions of the company. Herrenknecht offers interesting perspectives to the junior employees in an innovative and future-proof technological environment.
more
Sep 20, 2007
Article
Sewer rehabilitation in Botany
The rehabilitation of large trunk sewers is rarely easy. When the sewer is a 90-year-old above ground concrete box structure with an unusual internal geometry on a horizontal curve and with major problems including leakage at moving joints and active horizontal cracks, then the task is made even harder.
more
Sep 17, 2007
News
bauma China 2008 in Shanghai
The next bauma China will be held at the Shanghai New International Expo Center (SNIEC) from 25 to 28 November 2008.
more
Sep 12, 2007
News
Next stop: Leicester Square!
Thames Water's Victorian mains replacement project reaches London landmark
more
