SHIELD BORING MACHINE AND SHIELD METHOD

• Main Authors: MIYAZAWA MASAHIRO, YAZAWA TSUGIO, SHINOHARA KEIJI, MIYASHITA SATORU, NOMOTO KOSUKE, KOIZUMI ATSUSHI, YASUMITSU TATSUYA, MORI YOSHIKI
• Format: Patent
• Language: English; Japanese
• Published: 05.02.2015
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MINING; SHAFTS; TUNNELS

PROBLEM TO BE SOLVED: To provide a shield boring machine having the following features: inner and outer duplicated cutters are provided: relative position between the center cutter and the periphery cutter in forth and back direction may be changed so as to reduce boring load by adjusting to the nature of the soil during operation; prevented is boring failure due to remaining part corresponding to a gap part between the center cutter and the periphery cutter.SOLUTION: A shield boring machine comprises a center cutter 20 and a periphery cutter 30. The center cutter 20 moves forward relative to the position of the periphery cutter 30. A remaining gap boring cutter 25 executing projecting action is arranged on the periphery of the center cutter 20. In addition, the center cutter 20 executes boring by moving forward relative to the position of the periphery cutter 30. The remaining gap boring cutter 25 on the periphery of the center cutter 20 executes projecting action to bore the gap between the center cutter 20 and inner periphery of the periphery cutter 30. 【課題】内外二重カッタを備えるシールド掘進機において、その中央カッタと外周カッタの前後方向相対位置を可変として、施工途中でも土質毎に対応して掘削時の負荷を低減できるようにする。さらに、中央カッタと外周カッタの隙間部分の掘り残しによる掘削不能を防止する。【解決手段】中央カッタ２０と外周カッタ３０とを備えるシールド掘進機であって、外周カッタ３０の位置に対し前進動作する中央カッタ２０を備えるとともに、その中央カッタ２０の外周に突出動作する隙間余掘りカッタ２５を備える。そして、中央カッタ２０を外周カッタ３０の位置に対し前進させて掘進するとともに、その中央カッタ２０外周の隙間余掘りカッタ２５を突出動作させて外周カッタ３０内周との隙間を余掘りする。【選択図】図２