TUNNEL EXCAVATION METHOD FOR UPPER-SOFT AND LOWER-HARD STRATUM

WIPO Patent Application WO/2022/083096

A1

A tunnel excavation method for an upper-soft and lower-hard stratum. The section of a tunnel is divided into an upper portion and a lower portion. The excavation step comprises: S1, constructing advanced support on an arch portion of the tunnel; S2, excavating a lower step (1) on the lower section of the tunnel in a multi-time cyclic footage blasting manner, wherein a lower step primary support and a temporary support of a temporary arch portion (11) of the lower step (1) are constructed after each time of cyclic footage blasting is completed; and S3, excavating an upper step (2) on the upper section of the tunnel in the multi-time cyclic footage blasting manner, wherein the corresponding temporary support is removed before each time of cyclic footage blasting, an upper step primary support is constructed after each time of cyclic footage blasting is completed, and the upper step primary supports and the lower step primary supports are closed to form rings.

ZHANG SHUAI (CN)
WANG JIANHUI (CN)
YANG KAI (CN)
SONG XINHAI (CN)
YU JIAN (CN)
WANG JIWEI (CN)

PCT/CN2021/090852

April 28, 2022

April 29, 2021

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CHINA RAILWAY 19TH BUREAU GROUP FIFTH ENG CO LTD (CN)
CHINA RAILWAY 19TH BUREAU GROUP CO LTD (CN)

E21D9/04; E21D9/00; E21D9/14; E21D11/10; E21D11/15; E21D19/04

CN112431599A	2021-03-02
CN104895575A	2015-09-09
CN205063959U	2016-03-02
JP2000345794A	2000-12-12
CN106321106A	2017-01-11

JIN QIANGGUO: "Discussion on the Invert Benched Excavation Method for Qingshan Tunnel", TUNNEL CONSTRUCTION, no. 3, 15 August 2000 (2000-08-15), pages 55 - 58, XP055923533, ISSN: 2096-4498

CN-KNOWHOW INTELLECTUAL PROPERTY AGENT LIMITED (CN)

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