Robbins TBM completes drainage tunnels at Po Shan
Apr 25, 2008
A 3.5 m (11.5 ft) diameter Robbins TBM recently completed two drainage tunnels in Hong Kong without a conventional back-up system. Excavation of the short tunnels, measuring just 244 m (800 ft) and 165 m (541 ft) in length, concluded on March 17, 2008.
The majority of new design elements on the Robbins TBM were customized for the short tunnels and small jobsite. The entire launch area for the machine measured 25 m (82 ft) wide x 27 m (88 ft) long, with the tunnel portal just 50 m (164 ft) from busy Po Shan Road.
Muck removal was accomplished using a series of conveyors on wheels, which emptied into a steel silo for removal by dump trucks. Though slower than a conventional setup, the TBM still excavated a best day of 22 m (72 ft) in less than six hours. Electrical transformers and control cabinets remained at the tunnel portal as the machine bored, connected by umbilical cables containing power and electrical control cabling.
Several hundred sub-vertical drainage holes are now being drilled from the inside of the bored tunnels. Water will eventually be drained from the hillside into the drainage tunnels via these sub-vertical holes. A modified drill rig and hydraulic hammer are being used to drill the holes and install slotted drainpipes. The amount of drainage needed will be continuously monitored using standpipe piezometers fitted with automatic loggers. The meters will transfer data to engineering offices in real-time. Water collected inside the tunnels will be channeled to a nearby public storm water drainage system.
More News and Articles
Sep 27, 2023
New e-learning module of the course BE-07 Investigation and Inspection of Sewers and Pipelines now available on UNITRACC!
Sep 27, 2023
Any water loss through leaking pipes is unacceptable in the eyes of the public, and on the launch of a deep-dive leakage report from Ovarro, technology leader for leakage solutions, Barbara Hathaway, explains how technologies continue to advance.
Sep 25, 2023
Pumping liquids may seem like a solved problem, but optimizing the process is still an area of active research. Any pumping application—from industrial scales to heating systems at home—would benefit from a reduction in energy demands. Researchers at the Institute …
Sep 22, 2023
PPXXI Conference and Exhibition welcomes McElroy Manufacturing, Inc. as the mobile app sponsor. Their sponsorship enhances networking opportunities for the delegates. Scheduled over September 25 -27, 2023, in Lake Buena Vista, Florida, PPXXI is the key technical and business event …
Sep 20, 2023
Aquatech is the leading water technology show in the world, with over 800 exhibitors and expecting over 22,000 visitors from over 140+ countries.
Sep 18, 2023
Designed to reduce pollution in Lake Erie by four billion gallons per year, Project Clean Lake is a 25-year plan being overseen by Cleveland's Northeast Ohio Regional Sewer District (NEORSD). When construction crews complete the $3 billion undertaking in 2036, …
Sep 13, 2023
Mullane once again proved why the company is an industry leader in pipeline solutions with a relining project on the mid north coast of New South Wales.
Sep 11, 2023
Pezzimenti Trenchless continues to showcase its position as a leading trenchless specialist by completing works on two Victorian projects.
Sep 08, 2023
Silvertown Tunnel under Thames - Newham to Greenwich near O2 Arena: See two massive boreholes in east London
The second of two boreholes beneath the Thames – which will together form London’s new Silvertown Tunnel – is now complete.
Sep 04, 2023
Report highlights American Water’s sustainable impact on communities across the U.S.
Aug 31, 2023
Anaergia Selected to Design, Build and Operate Organic Waste-to-Renewable Energy Project in San Diego County
System to provide renewable power, reduce wastewater utility costs, and cut greenhouse gas emissions for East County Advanced Water Purification facility.
Aug 28, 2023
Spiral wound lining is a sustainable method of pipe maintenance, allowing water authorities and councils to renew their critical infrastructure. Interflow is an expert in this field and has been pioneering new techniques for decades.