| 31. | A full-face boring machine called a mole was used to drill an diameter tunnel into the mountain.
|
| 32. | The under-river passage was bored by two early tunnel boring machines, each with an external diameter of.
|
| 33. | A total of 320 compressed air workers were involved in 9018 pressure exposures in the four tunnel-boring machines.
|
| 34. | The spokesman said the tunnel boring machines has been designed to excavate and construct the tunnel lining simultaneously.
|
| 35. | Microtunnel boring machines are very similar to tunnel boring machines ( TBM ) but on a smaller scale.
|
| 36. | The longer the tunnel, the less the relative cost of tunnel boring machines versus drill and blast methods.
|
| 37. | In early December 2014, Deutsche Bahn provided updated details of the procurement of the two tunnel boring machines.
|
| 38. | The Robbins Company, a leading international manufacturer of tunnel boring machines founded in 1952, is headquartered in Solon.
|
| 39. | Microtunnel boring machines are very similar to tunnel boring machines ( TBM ) but on a smaller scale.
|
| 40. | Construction began in the second half of 2007, and the tunnel boring machine started to operate in 2009.
|
