Tunnel Business Magazine

APR 2018

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TUNNELINGONLINE.COM TBM: TUNNEL BUSINESS MAGAZINE // APRIL 2018 B U S I N E S S B R I E F S 6 Veteran Robbins TBM Plays Role in Ending Flooding in Chicago Neighborhood In Chicago, Kenny Construction is nearing completion on the Albany Park Stormwater Diversion Tunnel. The proj- ect, owned by the Chicago Department of Transportation, will divert water from the Albany Park neighborhood, which has long been plagued by flooding. Plans for the tunnel began in 2013, after flood conditions became so severe that resi- dents had to be evacuated from the area by boat. The tunnel is expected to be functional by April 2018. A Robbins Beam Hard Rock bored the tunnel and broke through at the end of August 2017, bringing the project one step closer to c also known as "Keri," has been owned by project contractor Kenny Construc- tion since the 1990s and has been used on several projects prior. "The machine holed through into the inlet shaft," said Clay Spellman, Proje or Kenny Construction. "We excavated the shaft as part of the project. The machine has since been disassembled and removed." For the Albany Park project, Keri was rebuilt by Kenny Construction with size modifications designed by Robbins. Rob- bins took an existing cutterhead, repaired it, and then added segments, taking it from 5.2 m (17.2 ft) to 6.2 m (20.4 ft) in diameter. "Extensive modifications were also made underground to the machine to be able to install rock dowels and stand the ring steel under the roof shield," add- ed Spellman. "Rebuilding has always been a core part of R customers immediately recognize that a rebuilt machine with updated systems can offer exceptional value without in- creasing risk, and a rebuilt machine can usually be delivered faster," said Robbins Engine e Smading. "While the financial and schedule advan- tages are obvious, the flexibility of used equipment may be less obvious. Boring diameters can be increased or decreased and machine configurations can even be changed. For example, a Single Shield can be reconfigured as a Double Shield or vice v e reconfigured as a shielded machine. Soft ground machines can be configured for different geologies and can be set up as either Slurry or EPB." Over 50 percent of all R Beams ever manufactured have been used on three or more projects. Incredibly, many Robbins that have been used on multiple projects are approaching over 50 km (31 miles) of use. Prior to its own- ership by Kenny, Keri has successfully bored tunnels in the Dominican Republic, Saudi Ara - taling at least 19.5 km (12 miles) of tunnel. Due to the project location in a residen- tial neighborhood, there were restrictions in place as to when the machine could op- erate and the frequency at which blasting would be allowed per day. Despite these limita ed a best day of 39.5 m (129.7 ft) and a best week (5 days) of 146.4 m (480.4 ft). The machine bored through dolomite with an average com- pressive str a UCS (9,300 psi). "During boring we encountered ap- proximately 30.4 m (100 ft) of fractured ground that had to be supported with rolled channels, straps, and 19 full circle steel rings," said Spellman. The drainage tunnel starts in Eugene Park and extends for approximately 1 mile under Foster Avenue to the Shore Channel. When the Chicago River's water levels reach flood stages—exceed- ing 2 m (7 ft)—the tunnel will divert a flow of 65 cubic meters (2,300 cubic ft) of water per second, avoiding Albany Park, then deposit it into the Channel. The tunnel will essentially be transferring the water where it would have ended up, without damaging the residential area or adverse- ly affecting the river's wildlife. In Jilin, one of the three provinces of Robbins Hard Ro achieved a national record for 7 to 8 me- ter (23 to 26 ft) machines: 1,423.5 m (4,670 ft) in one month. The record tops a previ- ously set achievement on the same proj- ect fr advanced at a rate of 1,336.8 m (4,386 ft) in one month. The world record for the size class is held by another Robbins machine, set more than 20 years ago at the Tunnel and Reservoir Plan (TARP) in Chicago: 1,482 m (4,862 ft) in one month. However, given the differences in rock conditions, this Ji- lin project record is significant. At TARP, the rock was relatively homo- geneous dolomitic limestone averaging a/21,100 psi with occasional rock bolts; at Jilin the rock types were rated from 35 to 206 a UCS (5,100 to 30,000 psi), and identified as tuff, granite, sand- stone, and andesite with multiple fault zones—conditions requiring nearly con- tinuous ground support. Despite the difficult conditions, the Jilin machine has achieved an average monthly advance rate of 708.3 m since the start of b ch 2015—more than three times the average monthly rate of a drill-and-blast operation on an- other section of the project. Robbins Main Beam Breaks Records in China The 6.2 m (20.4 ft) diameter Robbins Main Beam TBM broke through in August 2017 on Chicago, USA's Albany Park Diversion Tunnel, which will go online this April.

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