Open and Full Shield TBM excavate mountain tunnels by disc cutter mounted to entire surface of the cutter head. We have experience to excavete variable rock condition not only hard rock, but also crush zone.
We have a delivery record of a maximum diameter of 12.84m TBM.
The open TBM is comprised of cutter head, cutter head drive, main beam, gripper and roof support. This simple structure enables workers to treat cutting face at adjacent point to cutter head.
The open TBM shows high performance and economical excavation in solid bedrock conditions. It is suitable for straight excavation as digging direction is regulated by beam structure.
|Year of delivery / Place of delivery||2003 / Gunma Prefecture|
|Construction name||JR Agatsuma Line replacement line Yamba tunnel construction|
|Owner name||East Japan Railway Company|
|Contractor name||Shimizu / Nishimatsu / Hazama JV|
|TBM outer diameter||6.82m|
New Open TBM
The new open TBM combines the features of full shield TBM which is suited for various ground conditions and open TBM which is suited for high-speed excavation in solid bedrock conditions. It can treat looseness from and falling of fragile soil, simultaneously it enables workers to treat cutting face at adjacent point to cutter head.
|Year of delivery / Place of delivery||2004 / Gifu Prefecture|
|Construction name||Tokai Hokuriku Expressway Hida Tunnel Construction|
|Owner name||Japan Highway Public Corporation|
|Contractor name||Taisei / Nishimatsu / Sato JV|
|TBM outer diameter||12.84m|
Full Shield TBM
By adopting a cylindrical shell structure, the Full Shield TBMs are suitable for broad range of ground conditions, from tough rocks to soft strata including fracture zones.
|Year of delivery / Place of delivery||2007 / Korea|
|Construction name||GEOYO KARAK CABLE TUNNEL|
|Owner name||Korea Electric Power Corporation|
|Contractor name||Toa Geology|
|TBM outer diameter||4.55m|