{"id":10132,"date":"2018-02-20T12:24:55","date_gmt":"2018-02-20T20:24:55","guid":{"rendered":"http:\/\/robbinstbm.com\/?p=10132\/"},"modified":"2018-05-22T15:24:31","modified_gmt":"2018-05-22T22:24:31","slug":"jilin-record","status":"publish","type":"post","link":"https:\/\/www.robbinstbm.com\/es\/jilin-record\/","title":{"rendered":"Robbins Main Beam Breaks Records in China"},"content":{"rendered":"

In Jilin, one of the three provinces of Northeast China, a 7.9 m (26 ft) diameter Robbins Hard Rock Main Beam TBM has achieved a national record for 7 to 8 meter (23 to 26 ft) machines: 1,423.5 m (4,670 ft) in one month. The record tops a previously-set achievement on the same project from earlier in 2017, when the TBM advanced at a rate of 1,336.8 m (4,386 ft) in one month.<\/p>\n

The world record for the size class<\/a> is held by another Robbins machine, set more than 20 years ago at the Tunnel and Reservoir Plan (TARP)<\/a> in Chicago, Illinois, USA, for 1,482 m (4,862 ft) in one month. However, given the differences in rock conditions this Jilin project record is very significant. At TARP the rock was relatively homogeneous dolomitic limestone averaging 145 MPa\/21,100 psi with occasional rock bolts; at Jilin the rock types were rated from 35 to 206 MPa UCS (5,100 to 30,000 psi), and identified as tuff, granite, sandstone, and andesite with multiple fault zones\u2014conditions requiring nearly continuous ground support.<\/p>\n

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