Singapore - Trenchless International

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sINGAPORe FeAtURe October 2010 - Trenchless International 22 Under singapore Singapore is a regional transcenter of excellence for water and wastewater management. Many successful rehabilitation and installation projects have been achieved through the use of Trenchless Technology. PubLIc uTILITIeS bOard (PUB) is a statutory board under the Ministry of the Environment and Water Resources. PUB manages the complete water cycle in singapore. It is the national water agency, managing singapore’s water supply, water catchment and used water in an integrated way. Director of PUB Water Reclamation Department tan thai Pin said singapore faces challenges as more lucrative land use competes with the need for urban water catchments. the solution is three pronged: • Membrane technology to filter sewer water • timely implementation • trenchless technology for pipe laying and rehabilitation. PUB plans to rehabilitate 1,000 km over the next five years using CIPP, spiral wound lining and fold and formed. they will also use pipe jacking and microtunnelling to extend the sewer network. Chief Executive of PUB Khoo teng Chye has said that singapore has come a long way from the days when it was faced with problems such as flooding, pollution and water shortages. since then, PUB has been recognised through many international awards. Mr Khoo attributes PUB’s achievement to investing in water restoration and development, technology and by adopting an integrated and holistic approach to water management. “today, we have in place a longterm water supply strategy known as the Four National taps, comprising water from local catchments, imported water, reclaimed water (branded NEWater in singapore) and desalinated water,” he said. Mr Khoo said that NEWater and desalinated water are the result of PUB’s c o n t i n u o u s PUB Water Reclamation Department Director Tan Thai Pin. “We engage the community, as well as the stakeholders, to conserve water, to value the water – so they don’t pollute the water – and also enjoy the water.” investments in R&D and technology. “By leveraging on advancements in technology and decreasing costs, PUB was able to successfully introduce these two alternatives as viable sources of water for singapore.” Mr Khoo has said that PUB has also worked towards a more people-oriented approach to delivering water, by adopting the tagline ‘Water for all: Conserve, Value, Enjoy.’ “securing an adequate supply of water is only half of the equation – managing the water demand is just as important. to ensure sustainability of singapore’s water resources, PUB calls on all singaporeans to play their part to conserve water, keep the water catchments and waterways clean and build a closer relationship with water by enjoying this precious resource.” Wastewater management PUB is vested with the challenging task of maintaining the sewerage reticulation system which has its origin in colonial times. the sewerage Department of PUB identifies older sewers, restores their condition and keeps the health of the system in the pink to serve the increasing development in singapore. ISTT Chairman Dec Downey. SgSTT shows leadership in Singapore In June 2010, Istt Chairman Dec Downey attended the launch of a local society to be known as sgstt. Dr Downey said that the singapore International Water Week was a great event with a number of international groups supported by their government and municipal agencies, good for networking and for promoting Istt’s singapore International No-Dig. “At one of the events, Minister Mentor Lee Kwan Yu, founder of the modern singapore spoke highly of the contribution of trenchless technology to the development of the clean, green singapore with its deep sewer tunnel and recycled water usage. Accolades which testify to the merits of our business do not come from sources any more esteemed than Mr Lee.” sewer rehabilitation originally involved a large amount of excavation work and sewers were repaired mainly by the open trench method. the operation, while necessary, was time-consuming and often caused inconvenience to customers. today, PUB uses a number of trenchless technologies such as pipe bursting and spiral wound lining in sewer rehabilitation work as they continue to maintain the 3,400 km of gravity sewers, 220 km of pumping mains and 130 pumping installations of the sewer reticulation system. PUB has also used trenchless technology to reline some 600 km of public sewers and private drain lines under the third phase of the ongoing sewer rehabilitation program. the trenchless technology used includes cure-in-place piping, spiral wound lining and fold-andform technology. the ongoing sewer rehabilitation program, current phase 2009–2014, will see the refurbishment of more than 1,000 km of this network. Much of this work will be undertaken using microtunnelling. “Securing an adequate supply of water is only half of the equation – managing the water demand is just as important. When asked about the future use of trenchless technology in singapore, Mr Khoo said that PUB will continue to adopt the use of trenchless technology for the laying of sewers and for singapore’s ongoing sewer rehabilitation program. “this is to ensure that singapore’s sewer system is kept in tip-top condition and free of leakages that could contaminate our rainwater collection system.” deep Tunnel Sewerage System the Deep tunnel sewerage system, (Dtss) conceptualised and managed by PUB, is singapore’s superhighway to meet its used water needs for the next 100 years in a cost-effective and sustainable way. One of the world’s largest used water collection and treat- DTSS tunnel alignment ment projects, the Dtss conveys used water from homes and industries through a 48 km long deep tunnel sewer that runs 20–55 m below ground to a centralised water reclamation plant for treatment. the major tunnelling challenges of the Dtss project included the high groundwater table; mixed face and very abrasive ground conditions; highly variable rock quality in the granite and sedimentary formations; and the major expressways directly above the tunnels, making avoidance of settlement and/or face collapse critical. the Dtss comprises a 48 km deep tunnel, a water reclamation plant, a deep sea outfall and some 60 km of linking sewers. Relying entirely on gravity, used water is channeled through the deep tunnel to the water reclamation plant where it is treated before being discharged to the sea. trenchless technology is being used in the construction of these deep tunnels and link sewers. the construction of the 48 km tunnels with diameters ranging from 3.3 m to 6 m and depths of 18 m to 50 m below ground were completed using tunnel boring machines. A total of eight tunnel boring machines were used for driving the 48 km of tunnels. the eastern two-thirds of the North tunnel were constructed through the Old Alluvium layer, a generally competent tunnelling material. the tunnel however, was deep below the groundwater table, in some areas more than 45 m, requiring constant control of the tunnel face to prevent face instability. Earth-pressure balance shield machines were used to control face instability. the link sewers, with diameters up to 3 m and depths of up to 40 m are mainly being laid by pipe jacking. the Dtss was the recipient of the Global Water Awards ‘Water Project of the Year', the water project with the most significant contribution to water technology and environmental protection. sINGAPORe FeAtURe October 2010 - Trenchless International 23
sINGAPORe FeAtURe October 2010 - Trenchless International 24 singapore International No-dig The spotlight will be on Singapore as it hosts an exciting forum for trenchless technologists at the ISTT’s 28th International No-Dig 2010 Conference and Exhibition, 8–10 November this year. MOre ThaN 80 companies from 21 countries are already represented in the exhibitor line up, including a group participation of local companies hosted by the newly formed singapore society for trenchless technology (sgstt). the Gstt will also be presenting the ‘Made in Germany’ Pavilion, while other countries featured include Australia, Japan, Korea, UAE, China, India, Malaysia, UsA, Canada, UK, Denmark and Italy. Headline sponsors of the event are Vermeer Corporation, international manufacturers of horizontal directional drilling (HDD) machines and Pure International, who are world leaders in the development and application of innovative technologies for inspection, monitoring and management of physical infrastructure. Istt Chairman Dec Downey said “We are delighted with the response to the show. “Visitors are sure to be impressed with the range of products and equipment on display from around the world, with many niche suppliers displaying alongside the major international players.” Mears_HDD Ad dragon_185x125mm_ad 9/30/10 12:20 PM Page 1 World class conference An integral part of the event is the Istt’s International Conference. speakers from some 23 countries will present their knowledge and expertise on new products, techniques and research programs. Delegates will be able to hear the experience, challenges and solutions encountered in many engineering projects. the opening keynote address will be given by Khoo teng Chye, Chief Executive of singapore’s national water agency, PUB. On Day 2, a keynote presentation will be given by Mohd Akhir Md Jiwa, Director General sewerage services, Ministry of Energy, Green technology and Water, Malaysia. the full conference program is available online at the event website www.nodigsingapore.com Program Chairman and Vice Chairman of the International society for trenchless technology (Istt) sam Ariaratnam said “the 2010 conference in singapore has attracted the highest number of papers for many years and are of outstanding quality. Catch up with the trenchless International team at Singapore International No-Dig, Sales Representative Brett Thompson, Managing Editor Kate Pemberton and Editor-in-Chief Chris Bland. We are looking forward to a very educational and truly international meeting.” Gala dinner Delegates attending the conference are recommended to consider joining the Gala Dinner to be held at the Pan Pacific Hotel on tuesday 9 November. this will be an excellent opportunity to meet like-minded individuals in a relaxed atmosphere. see you in singapore! Mears horizontal directional drilling. Because a lot can happen between Point A and Point B. Surprises lead to delays, delays lead to cost overruns. So work with a team that keeps nasty surprises away from you, your schedule, and your budget. At Mears, our in-house planners and engineers look deeper, to plan farther ahead. And, our field operators have both the expertise and the equipment to implement any plan, in any place. We listen. We plan. We deliver. So the only thing that happens, is success. Give us a call at (281) 448-2488. Mears Group Inc. is a Quanta Pipeline Services company DESIGN/BUILD • SOIL AND ROCK • SMALL TO LARGE CROSSINGS • SHORE APPROACHES Mears Group, Inc. • 920 Memorial City Way, Suite 650 • Houston, TX 77024 USA • www.mears.net International Society For Trenchless Technology Announcing 2010 INTERNATIONAL NO-DIG Singapore 28 TH International Conference & Exhibition 8-10 November 2010 ■ 2010’s world forum on Trenchless Technology ■ Major Exhibition showcasing the very best products and services for the installation and refurbishment of underground utilities ■ International Conference programme featuring the latest innovations and techniques For further information on exhibiting, attending the conference, or visiting the exhibition, keep up to date at www.nodigsingapore.com or contact the appointed organisers: Westrade Group Ltd Email: trenchless@westrade.co.uk Exhibition Enquiries - Paul Harwood Supporting organisations Tunnelling and Underground Construction Society (Singapore) Tel: +44 (0) 845 094 8066 Web: www.westrade.co.uk Conference Enquiries - Caroline Prescot Gold Sponsor Silver Sponsor
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Singapore - Trenchless International

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