US 11,898,447 B2
Full-circle secondary lining inverted arch construction formwork system for long-distance tunnel and formwork transporting method
Xiaosong Dai, Hubei (CN); Kaiyang Liu, Hubei (CN); Ruihua Jia, Hubei (CN); Changyi Su, Hubei (CN); Haihua Gu, Hubei (CN); Yisheng Ye, Hubei (CN); Wei Chen, Hubei (CN); Xiaofei Xie, Hubei (CN); Hao Zhou, Hubei (CN); Jian Cui, Hubei (CN); Yisheng Luo, Hubei (CN); and Wenbo Lu, Hubei (CN)
Assigned to CCTEB INFRASTRUCTURE CONSTRUCTION INVESTMENT CO., LTD., Hubei (CN); and CHINA CONSTRUCTION THIRD ENGINEERING BUREAU GROUPCO;LTD, Hubei (CN)
Filed by CCTEB INFRASTRUCTURE CONSTRUCTION INVESTMENT CO., LTD., Hubei (CN); and CHINA CONSTRUCTION THIRD ENGINEERING BUREAU GROUP CO;LTD, Hubei (CN)
Filed on Apr. 12, 2021, as Appl. No. 17/228,686.
Application 17/228,686 is a continuation of application No. PCT/CN2021/081400, filed on Mar. 18, 2021.
Prior Publication US 2021/0231014 A1, Jul. 29, 2021
Int. Cl. E21D 11/10 (2006.01); E21D 11/40 (2006.01)
CPC E21D 11/102 (2013.01) [E21D 11/40 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A full-circle secondary lining inverted arch construction formwork system for a long-distance tunnel, comprising: a customized steel formwork (1), a steel pipe support (7), and a turn buckle (8), wherein:
the customized steel formwork (1) comprises a panel (101), a flange plate (102), a ring-shaped secondary edge, a longitudinal main edge, two longitudinal rails (103), an oblique supporting system (104), and a cover plate (105), wherein the flange plate (102), the ring-shaped secondary edge and the longitudinal main edge are welded on the panel (101) to bear forces together; the longitudinal rails (103) are arranged on the ring-shaped secondary edge, and end surfaces of the longitudinal rails (103) are flush with the flange plate (102); a ring width of the panel (101) is smaller than a clearance between the two longitudinal rails (103) integrated on the customized steel formwork (1) as well as a clearance between two columns of a cantilever gantry crane (2); the oblique supporting system (104) comprises a fixed base plate, an adjustable pin cylinder, an oblique supporting rod, and a limiting pin shaft, wherein a through hole and an internal thread are arranged in a middle of the fixed base plate; the adjustable pin cylinder has a matched external thread and is screwed into the through hole of the fixed base plate; an extending length of the oblique supporting rod is adjusted through threads; the oblique supporting rod is a steel pipe; an end-blocking steel plate is provided on a bottom of the oblique supporting rod, and a pull ring is provided on a top of the oblique supporting rod; the adjustable pin cylinder has a limit hole, and the oblique supporting rod has two limit holes; before concrete pouring, the limit hole on the top of the oblique supporting rod is aligned with the limit hole of the adjustable pin cylinder, and is locked by the limiting pin shaft to support a formwork; after the concrete pouring, the limiting pin shaft is pulled out; then the limit hole on the bottom of the oblique supporting rod is aligned with the limit hole of the adjustable pin cylinder, and is locked by the limiting pin shaft to form a formwork surface; the cover plate (105) is located on the ring-shaped secondary edge to prevent the formwork from being polluted by concrete during the concrete pouring;
the steel pipe support (7) is arranged on the longitudinal main edge, and is provided between the longitudinal rails (103) and a primary lining (6) for supporting vertical buoyancy;
the turn buckle (8) is arranged between two sides of the formwork and a reserved steel bar for resisting horizontal load generated during asymmetric pouring.