TUNNEL EXCAVATOR AND TUNNEL CONSTRUCTION METHOD

• Main Authors: SUGIYAMA MASAHIKO, GOTO TATSUO, KASHIMA YUTAKA, KONDO NORIO, HOKARI MINORU, OTSUKA TAKAYOSHI
• Format: Patent
• Language: English; Japanese
• Published: 22.08.2016
• Subjects: EARTH DRILLING; FIXED CONSTRUCTIONS; GALLERIES; LARGE UNDERGROUND CHAMBERS; MINING; SHAFTS; TUNNELS

PROBLEM TO BE SOLVED: To provide a tunnel excavator and a tunnel excavation method that facilitate excavation work when excavating a preceding tunnel in a defective ground, while suppressing increase in machine body length.SOLUTION: A tunnel excavator includes: a cutter head 12 supported rotatably on a front part of an excavator body 11, for excavating a pit face in a ground; a bulk head 20 having a chamber 27 for storing excavation sediment generated as the cutter head 12 excavates the ground, formed between the cutter head 12 and the bulk head; a cutter-side opening 34 formed on the cutter head 12; a cutter-side door 35 that opens/closes the cutter-side opening 34; a partition wall-side opening 21 formed in the bulk head 20; and a partition wall-side door 28 that opens/closes the partition wall-side opening 21. When excavating a preceding tunnel Ta from inside the excavator body 11 into a pit face that opens in front through the opened partition wall-side opening 28 and the cutter-side opening 35, the fully opened cutter-side door 35 is brought into contact with the fully opened partition wall-side door 28.SELECTED DRAWING: Figure 3 【課題】機体長さを抑えつつ、先行トンネルを不良地盤に掘削する際の掘削作業を容易に行うことができるトンネル掘削機及びトンネル施工方法を提供する。【解決手段】掘削機本体１１の前部に回転可能に支持され、地盤に切羽を掘削するカッタヘッド１２と、カッタヘッド１２の掘削に伴って発生した掘削土砂を蓄えるチャンバ２７をカッタヘッド１２との間において形成するバルクヘッド２０と、カッタヘッド１２に形成されるカッタ側開口部３４と、カッタ側開口部３４を開閉するカッタ側開閉扉３５と、バルクヘッド２０に形成される隔壁側開口部２１と、隔壁側開口部２１を開閉する隔壁側開閉扉２８とを備え、開放された隔壁側開口部２８及びカッタ側開口部３５を通じて前方に開いた切羽に対して、先行トンネルＴａを掘削機本体１１内から掘削可能とする際に、全開させたカッタ側開閉扉３５を、全開させた隔壁側開閉扉２８に当接させる。【選択図】図３