US 11,686,198 B2
Reinforcement system at railway tunnel section passing through karst cave with large dip angle and construction method
Xin Zhang, Tianjin (CN); Zhitao Zhao, Tianjin (CN); Jufa Xi, Tianjin (CN); Xiangping Zhang, Tianjin (CN); Baoxin Jia, Fuxin (CN); and Jiashun Liu, Fuxin (CN)
Assigned to CHINA RAILWAY 18 BUREAU GROUP CO. LTD., Tianjin (CN)
Filed by CHINA RAILWAY 18 BUREAU GROUP CO. LTD., Tianjin (CN); and LIAONING TECHNICAL UNIVERSITY, Fuxin (CN)
Filed on Sep. 21, 2021, as Appl. No. 17/481,268.
Claims priority of application No. 202111008594.7 (CN), filed on Aug. 31, 2021.
Prior Publication US 2023/0068068 A1, Mar. 2, 2023
Int. Cl. E21D 11/04 (2006.01)
CPC E21D 11/04 (2013.01) 10 Claims
OG exemplary drawing
 
1. A reinforcement system at a railway tunnel section passing through a karst cave with a large dip angle, specifically comprising:
an umbrella arch (1-1), a concrete layer (1-2), a flexible buffer layer (1-3) and a protective layer (1-4) which are sequentially built at a top of a portion, of a main tunnel (1) from bottom to top, passing through the karst cave; and
an arch bridge (4) which is built at a bottom of a portion, of the main tunnel (1), passing through the karst cave, wherein a filling layer (4-1) is arranged over the arch bridge (4), two arched door openings (4-2) are reserved at portions, on two sides of the arch bridge (4), of the filling layer (4-1), a bottom plate (4-3) is arranged over the filling layer (4-1), a foundation pad (3-1) is arranged at a bottom of a foundation pit (3) under the arch bridge (4), and a vertical bearing wall (4-4) is built between the arch bridge (4) and the foundation pad (3-1).