#Core tunnel portal pdf#

230000000750 progressive Effects 0.000 abstract description 2.239000000463 material Substances 0.000 abstract description 8.238000010438 heat treatment Methods 0.000 claims description 2.238000009434 installation Methods 0.000 claims description 3.238000009385 rock melting Methods 0.000 claims description 8.230000002093 peripheral Effects 0.000 claims description 8.230000005641 tunneling Effects 0.000 claims abstract description 17.238000002844 melting Methods 0.000 claims abstract description 25.238000009412 basement excavation Methods 0.000 title claims description 11.239000011435 rock Substances 0.000 title claims abstract description 51.Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.) Filing date Publication date Application filed by US Department of Energy filed Critical US Department of Energy Priority to US436401A priority Critical patent/US3885832A/en Application granted granted Critical Publication of US3885832A publication Critical patent/US3885832A/en Anticipated expiration legal-status Critical Status Expired - Lifetime legal-status Critical Current Links Original Assignee US Department of Energy Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)Д®nergy Research and Development Administration ERDA Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US436401A Inventor John H Altseimer Robert J Hanold Current Assignee (The listed assignees may be inaccurate.

#Core tunnel portal pdf#

Google Patents Apparatus and method for large tunnel excavation in hard rockДownload PDF Info Publication number US3885832A US3885832A US436401A US43640174A US3885832A US 3885832 A US3885832 A US 3885832A US 436401 A US436401 A US 436401A US 43640174 A US43640174 A US 43640174A US 3885832 A US3885832 A US 3885832A Authority US United States Prior art keywords hull rock tunnel kerf melting Prior art date Legal status (The legal status is an assumption and is not a legal conclusion.

Google Patents US3885832A - Apparatus and method for large tunnel excavation in hard rock

US3885832A - Apparatus and method for large tunnel excavation in hard rock