A single gravity tunnel with isolation gates and additional tunnel and link sewer cross-connections optimizes system reliability and resilience from an operations perspective; and is the preferred system. It does not store any personal data. A significant hydraulic issue associated with the isolation gates is their removal. The CFD model developed to address the gate removal hydraulics was run in steady state mode with fixed gate openings and in transient mode with rising gates. However, additional measures were found necessary to meet the system containment criteria set forth by Singapore National Water Agency, Public Utilities Board (PUB). It amounted to a total of S$3.4 billion. Due to weight and logistical requirements, the gates will be fabricated in modular form and stored offsite. The dry weather flows were specified based on population predictions and per capita contributions. Our role. DTSS - Deep Tunnel Sewerage System | AcronymAttic Deep Tunnel Sewerage System - infrastructure.aecom.com This cookie is set by GDPR Cookie Consent plugin. Project Details - pub singapore's national water agency The same conditions as modelled with the CFD were simulated in the physical model and the results were close. The ramping up of pumps should lag behind the flow increase to allow some attenuation of small wet weather events and smoothing of the impact to the WRP processes. Flow re-routing during segment isolation. Large tunnels are increasingly used around the world for wastewater conveyance or storage in separated or combined sewer systems. One factor is that air flow in sewers is affected by a number of mechanisms including friction, atmospheric pressure variations, air density, and water level changes due to flow variations (Lowe 2016). Breakthrough for DTSS - Phase 2 - Tunneling World The hydraulic model was used to evaluate the self-cleaning characteristics of the South Tunnel under this mode of operation and to optimize the operation of the Tuas WRP Influent Pumping Station during wet weather. The existing conventional WRPs at Ulu Pandan and Jurong, as well as intermediate pumping stations, will be progressively phased out and the land freed up for higher value development. DEEP TUNNEL SEWERAGE SYSTEM (DTSS - T09), PHASE 2. Implementation of STEMS in DTSS2 Project Singapore - Maxwell GeoSystems The DTSS Phase 2 project is making steady progress. Leighton Asia, has been awarded a Deep Tunnel Sewerage System Phase 2 contract by PUB, Singapore's national water agency. Provide input to the air management analyses. Air flow in sewers has been the subject of a number of studies including field measurements (Pescod & Price 1982; Witherspoon et al. We also use third-party cookies that help us analyse and understand how you use this website. The good, bad and mixed on the DTSS - TunnelTalk Deep Tunnel Sewerage System (DTSS) - Phase 2 | Dextra Rock Bolts & Soft For over 45 years Leighton Asia has built a strong track record as an international contractorin the construction, civil engineering and offshore oil and gas sectors. Construction is scheduled to commence in October 2017 and complete by mid-2023. You also have the option to opt-out of these cookies. Client: Public Utilities Board Singapore Contracts: T03, T05, T06 and various link sewers. CPG - COWI JV. 2011); the North Dorchester Bay Tunnel in Boston, USA (Heath et al. The cookies is used to store the user consent for the cookies in the category "Necessary". Ed. In contrast with tunnels designed to store overflows in combined sewer systems, the DTSS tunnels convey used-water all the time from Singapore's separated system. Deep tunnel sewerage system phase 2 - hydraulics The Deep Tunnel Sewerage System (DTSS) is aimed at providing a robust and efficient means of catering to Singapore's used-water needs. PUB Singapore: Deep Tunnel Sewerage System [Case Study] - ECCO Steel NEWater will eventually meet up to 55% of our water demand in future. Phase 2 of DTSS will give a boost to our NEWater supply. 2009), physical modelling (Lyons et al. 2018) and this was the case for DTSS. There. Because of the variations in air flow requirements, two-speed fans are proposed, controlled by pressure measurements in the tunnels and link sewers. But opting out of some of these cookies may affect your browsing experience. Other uncategorised cookies are those that are being analysed and have not been classified into a category as yet. DTSS2 is the second phase of this project, comprising an approximately 30-km long South Tunnel, a 10-km long Industrial Tunnel, 60-km of Link Sewers and a new Water Reclamation Plant integrated with a NEWater facility. Deep Narayan - Singapore | Professional Profile | LinkedIn Without such vents, trapped air pockets can create geysers (violent eruptions of air and water) at shaft locations (Vasconcelos & Wright 2017; Brocard et al. Phase 2 consisting of networks of Link Sewers and Tunnels will extends the deep tunnels to serve the western part of Singapore. The main objective then was the ability to cater to population growth. The different failure scenarios were simulated in the hydraulic model individually and in combination to identify the optimum suite of resilience measures. D. Brocard, S. J. Gan, L. Y. Koh, T. W. Tan, W. I. Cox, T. Schellhase, L. L. Woo, S. H. Lo, S. Cheng, S. H. Loh, V. Perumal; Deep tunnel sewerage system phase 2 hydraulics. Fact Sheet on Deep Tunnel Sewerage System Phase 2 & Integrated Waste The following options were considered and optimized: Option 0: Single tunnel, with spur tunnel connection to the North Tunnel, Option 1: Single tunnel + section isolation, Option 2: Single tunnel + section isolation + link sewer cross-connections. 2015). PUB awards first set of contracts to build Deep Tunnel Sewerage System Tunnel Engineer. herrenknechtag Congratulations to Shanghai Tunnel Engineering Co. Pte Ltd, who recently completed a 3.8km long tunnel as part of the Singapore Deep Tunnel Sewerage System Phase 2. Velocity measurements were made using Particle Image Velocimetry (PIV), a laser-based system. Phase 2 consisting of networks of Link Sewers and Tunnels will extends the deep tunnels to serve the western part of Singapore. Deep Tunnel Sewerage System (DTSS) Phase 2 - YouTube The large tunnel and sewer sizes were selected to ensure sufficient used-water flow capacity in the future, this being an overriding requirement for the system. Zblin AG. When completed, it will have a conveyance system that is made up of 60 km of link sewers and 40 km of deep tunnels. The ability of the vortex drop to replace the air jumpers was investigated. Resilience has been a goal of sewer system developers for a long time, resulting in systems that have operated satisfactorily for over a century in cities such as London and Paris. There are also three main focus areas for the DTSS Phase 2: Deep tunnel sewerage system, tunnel and link sewers, and Turas WRP. These cookies ensure basic functionalities and security features of the website, anonymously. It started operating in 1993. The used water is then treated and further purified into ultra-clean, high-grade reclaimed water known as NEWater, with excess treated effluent discharged to the sea through an outfall. Contractor Zublin Singapore has revealed a pipejacking breakthrough at Shaft N3 of DTSS2 (the Deep Tunnel Sewerage System Phase 2) which is going to serve the eastern part of the country. The paper also presents several novel elements and the analyses that were conducted to develop and size them. The award of the tunneling contract to the Strabag team follows on the May 20 announcement that the province had awarded the tunneling contract for the Eglinton Crosstown West project to a team led by Aecon. To maximize the potential synergies of the water-energy-waste nexus, the co-location of Tuas WRP and the Integrated Waste Management Facility (IWMF) marks Singapores first initiative to integrate used water and solid waste treatment processes. These capacities are provided here to provide an indication of the air flows involved, and they may change during final design. Velocities exceeding 28 m/s are found downstream of the gate and because of the transition between the flat floor at the gate to the circular tunnel, significant splashing was observed. Leighton Asia is delivering Contract T-09 of the Deep Tunnel Sewerage System Phase 2 Project, which includes design and construction of approximately 7.9km of used water tunnels, each with an internal diameter of six metres, as well as shafts, hydraulic structures and other facilities associated with the used water sewerage conveyance system. DTSS Phase 2 comprises the following components: 40 kilometers of deep tunnels running largely under the Ayer Rajah Expressway, that will connect with the existing used water infrastructure to create one seamless and integrated system 39 days from submission to first decision on average. 2012; Eftekharzadeh et al. DTSS uses deep tunnels to convey used water by gravity to centralized water reclamation plants (WRPs) located at the coastal areas. And, based on a thorough review of Singapore as well as international data a per capita used-water contribution of 0.345 m3/capita/day was adopted, which is 15% above the 2013 rate. The resulting ratios vary from 0.36 to 0.44. Analysis of system failure scenarios for identification of resilience measures, Preliminary assessment of self-cleansing capacity and subsequent sediment transport modelling. The co-location will also be the first facility of its kind in the world that was planned from the ground-up. The incoming used-water flow will be conveyed around the isolated section through near surface sewers built for this purpose see Figures5 and 6. strabag tunnelling The cornerstone of the WPAP - Milwaukee's Deep Tunnel System - involved 19.4 miles of Deep Tunnels dug 300 feet underground to help reduce sewer overflows and basement backups. DTSS Phase 2 comprises the following components: Upon completion, the DTSS scheme will result in a reduction in land taken by used-water infrastructure with three centralised collection and treatment points: Changi WRP in the east; Kranji WRP in the north; and Tuas WRP in the west. Deep Tunnel Sewerage Phase 2 - CIMIC Group Scope of work Deep Tunnel Sewerage System, Singapore. The existing conventional WRPs at Ulu Pandan and Jurong, as well as intermediate pumping stations, will be progressively phased out and the land freed up for higher value development. It comprises of a tunnel conveyance system of approximately 63km of Link Sewers of diameter 0.3-4m and 35km of tunnels of diameter 3-6m, adding resiliency to Phase 1 and adopting lessons learned, focusing on energy usage, operational efficiency and minimisation of land-take. DTSS Phase 2 (DTSS2) comprises the South Tunnel which conveys domestic used water, the Industrial Tunnel for non-domestic used water, associated link sewers and the Tuas WRP. Minister for the Environment and Water Resources Masagos Zulkifli officiated the launch of the DTSS Phase 2 tunnel boring machine on 4 April 2019. PUB awards first batch of contracts for construction of Deep Tunnel Sewerage System (Phase 2) . Of particular importance was the specification of the influent flows to the system. 2013) and CFD modelling (Edwini-Bonsu & Steffler 2004). In support of Singapores long-term approach towards water resilience, AECOM and its joint venture partner teamed up with PUB, Singapores national water agency, to deliver a sustainable solution for used water management. The governing equation for the air flow is: The above equation can be used to simulate the conditions of full ventilation (no head gradient along the sewer) by setting H/X = 0. The connected gate modules will then be lifted and the support beams slid out. A Herrenknecht Mixshield with a diameter of 4.23m has been used. The required negative pressure was determined to be 2.4 mm of water, based on Singapore weather conditions of fairly constant year round temperature and humidity. Deep Tunnel Sewerage System Phase 2 - AECOM Vortex drops naturally pull air and, if the air flow driven by the vortex is equal to or greater than the incoming air flow in the link sewers, air jumpers may not be necessary. Leighton Asia is delivering Contract T-09 of the Deep Tunnel Sewerage System Phase 2 Project, which includes design and construction of approximately 7.9km of used water tunnels, each with an internal diameter of six metres, as well as shafts, hydraulic structures and other facilities associated with the used water sewerage conveyance system. The CFD modelling was conducted using the FLOW3D code with the RNG k-epsilon turbulence model. Diurnal flow variations were specified based on flow measurements in the system. Tunnel isolation using roller gates and link sewer bypass loop. The topics covered include hydraulic modelling of the entire system with the main goal of ensuring system resilience, air management to avoid odours at ground level, and isolation of tunnel section using gates for potential maintenance or repair. As the gates are lifted, used-water will rush under the gate at high speed. Project Details - pub singapore's national water agency All link sewers at the hydraulic drop structures just upstream of the tunnels have air to water flow ratios exceeding this number, suggesting that fan-enabled air jumpers were needed. In this case, the air flow is constant with distance. The simulation domain was discretized in a mesh of 2.3 million box-like cells 0.1 m on the side near the gate to 0.5 m farther in the tunnel. With the attenuated mode of operation, the modelling showed that this criterion was not met in the downstream section of the tunnel and a more thorough analysis involving sediment transport modelling was recommended. When isolation is no longer required, the drum hoist will be used to raise the gate. Other planning objectives included cost optimization, energy and land-take minimization, ease of operation and maintainability. In phase two, 40km of deep tunnels and 60km of link sewers will cover the western part of the island, as well as the downtown area. To maximize the potential synergies of the water-energy-waste nexus, the co-location of Tuas WRP and the Integrated Waste Management Facility (IWMF) marks Singapores first initiative to integrate used water and solid waste treatment processes. The simulations assumed an upstream head of 43 m based on the hydraulic analyses. Black & Veatch: Deep Tunnel Sewerage System - Global Leaders in In support of Singapores long-term approach towards water resilience, AECOM and its joint venture partner teamed up with PUB, Singapores national water agency, to deliver a sustainable solution for used water management. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. Deep Tunnel Sewerage System | Infopedia - National Library Board The Deep Tunnel Sewerage System (DTSS) is a core used water infrastructure which provides a cost-effective and sustainable solution to support Singapores continued growth and meet its long-term used water infrastructure needs. Get the latest updates in our Mar newsletter. Relative to self-cleaning, achieving a velocity of 1 m/s at least once a day was used as a preliminary criterion because of its ease of application, although it was recognized that several other factors are also relevant (CIRIA 1996; ASCE 2007). In this attenuated mode of operation, the South Tunnel would be used for storage, with its water level rising during the day and declining at night, as shown in Figure7. Operating the Tuas WRP Influent Pumping Station at a constant flow during dry weather was simulated. The gate modules will then be cleaned, inspected, and stored for future re-use. The deep tunnel sewerage system has long term sustainability and resilience of 3-node system. The AJs, shown in Figure9, will be located at sites where OCFs would not be feasible due to existing land use, for example built-up areas. 40 kilometers of deep tunnels running largely under the Ayer Rajah Expressway, that will connect with the existing used water infrastructure to create one seamless and integrated system, 60 kilometers of link sewers that create an interconnected network to channel used water from the existing sewerage pipelines to the deep tunnels, Outfall to discharge treated effluent into the sea, Feasibility study, preliminary design and programme management. Hydraulic modelling was conducted using the MIKE URBAN collection system modelling software (DHI 2014). These cookies help provide information on metrics the number of visitors, bounce rate, traffic source, etc. DTSS Phase 2 deep tunnels will be a showcase of cutting edge technologies and advanced smart sensors at work. These results were used to develop tunnel liner protection against the high velocities. The incoming air flows in the link sewers were estimated by assuming well-ventilated conditions, i.e. $528,530. The air pulling capacity of vortex drops has been studied in scale models conducted for other projects, from which an air to water flow ratio on the order of 1.5 was derived (Lyons & Odgaard 2010). Most of the Deep Tunnels are carved out in bedrock 300 feet underground by what is called a boring machine. Phase 1 of DTSS, which serves the eastern part of Singapore, was completed in 2008. The Deep Tunnel Sewerage System (DTSS) is aimed at providing a robust and efficient means of catering to Singapore's used-water needs. This roller gate system will ensure proper gate alignment to minimise frictional forces when lowering or raising the gates. We provide a diverse range of career options that allow our employees to grow and be challenged everyday. Long profile of water level and velocities four minutes after the start of gate opening. Comparable hydraulic analyses are typically conducted for the design of large wastewater tunnels. To be conservative a Manning's coefficient of 0.013, representative of aged conditions, was used for the tunnels. Construction begins for S$6.5 billion, 100km superhighway - TODAYonline The Zublin Link Sewer-S2 C2 project team has finished the connection between the DTSS link and the main sewer which was seen as a significant project milestone. Model simulations were conducted with and without water in the tunnel section downstream of the gate. A physical model of the gate opening was also conducted at Nanyang Technological University. Deep Tunnel Sewerage System (DTSS) - Water Technology DESIGN AND CONSTRUCTION OF SEWER TUNNELS FOR THE DEEP TUNNEL SEWERAGE SYSTEM PHASE 2 PROJECT. Leighton Asia is delivering Contract T-09 of the Deep Tunnel Sewerage System Phase 2 Project, which includes design and construction of approximately 7.9km of used water tunnels, each with an internal diameter of six metres, as well as shafts, hydraulic structures and other facilities associated with the used water sewerage conveyance system. Tunnel Boring Machine Launch Ceremony for Deep Tunnel Sewerage System
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