Title:
TUNNEL CONSTRUCTION METHOD AND TUNNEL BORING MACHINE
Document Type and Number:
Japanese Patent JP3170212
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To construct an overlaid layer with a constant thickness with pneumatically- applied concrete as timbering for wall surfaces, on wall surfaces immediately after excavation ahead of a tunnel boring machine and eliminate various bad effects of pneumatically-applied concrete behind the tunnel boring machine.
SOLUTION: A large diameter tunnel with a constant length is excavated by a front body section 1 being advanced, an excavation blade 14 protruding in the front of a rotary cutter plate 3 and an excavation blade 17 protruding in the circumferential edge in the diametrical direction in an extensible manner after the rear body 2 of a tunnel boring machine is supported on an already-constructed concrete overlaid layer C' through a rear gripper 6. And then, after the front body section 1 is retreated, with a spray nozzle 7 protruded from the opening 20 of the cutter plate 3 and the cutter plate 3 being turned, thick concrete over layer C is sprayed to the excavated wall surface T of a tunnel. Concurrently with the construction, the concrete overlaid layer C is reshaped to a concrete overlaid layer C' with constant thickness that is flat in the inside perimeter by the excavation blade 17 of the cutter plate 3 adjusted in a direction that reduces the diameter of the excavation blade 17 by a certain length by advancing the front body section 1.
Inventors:
Kyosuke Mishima
Hayatoshi Fujita
Masahiko Tanaka
Hayatoshi Fujita
Masahiko Tanaka
Application Number:
JP35362396A
Publication Date:
May 28, 2001
Filing Date:
December 16, 1996
Export Citation:
Assignee:
Okumura Gumi Co., Ltd.
International Classes:
E21D9/06; E21D9/10; E21D11/10; (IPC1-7): E21D9/10
Domestic Patent References:
| JP4239000A | ||||
| JP57123397A |
Attorney, Agent or Firm:
Takuya Yamamoto