Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Lining
Patent
1999-01-29
2000-06-20
Lillis, Eileen Dunn
Hydraulic and earth engineering
Underground passageway, e.g., tunnel
Lining
405151, 4051501, 405135, E21D 1100
Patent
active
060769955
ABSTRACT:
One end of a circumferential joining end surface 2 of segments 1 which are joined together in the circumferential direction of an excavated tunnel is made the male side circumferential joining end surface 2a on which a male coupler 4 is provided, and the other end is made a female side circumferential joining end surface 2b on which a female coupler 5 is provided. On a base plate 7, a bolt 10, which provides an engagement part 16 comprising a flat washer 13, a disc spring 14, and a head 15, is erected, and made a male coupler 4. An engagement plate 23, formed by a notch 22 which engages the bolt 10, and is inserted and engaged between the base plate 7 and the engagement part 16, and tightly held by the elastic force of the disc springs 14, is made the female coupler 5. One of the axial joining end surfaces of the segments 1 joined together in the axial direction of the excavated tunnel is provided with an axial male coupler 31 having a joining rod 35, and the other end is provided with an axial female coupler 41 which holds in and fastens the joining rod 35. In this manner, the joining operation between segments 1 can be simplified, and the operational efficiency improved.
REFERENCES:
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patent: 4830536 (1989-05-01), Birch et al.
patent: 5035538 (1991-07-01), Mitchell
patent: 5537794 (1996-07-01), Tolliver et al.
patent: 5634312 (1997-06-01), Tolliver et al.
Matsubara Kenta
Nakano Akihiko
Okayama Susumu
Someya Hiroki
Tauchi Eiji
Ishikawajima Construction Materials Co., Ltd.
Lagman Frederick L.
Lillis Eileen Dunn
Obayashi Corporation
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