The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 16, 2025
Filed:
Jun. 16, 2022
Cccc National Engineering Research Center of Dredging Technology and Equipment Co., Ltd., Shanghai, CN;
Yuanquan Miao, Shanghai, CN;
Weihao Song, Shanghai, CN;
Hongsheng Zhang, Shanghai, CN;
Qing Xu, Shanghai, CN;
Jingdun Pang, Shanghai, CN;
Yanxing He, Shanghai, CN;
Yi Wu, Shanghai, CN;
Jiandong Zhou, Shanghai, CN;
Abstract
A calculation method for measuring the flatness of cross-section of a tunnel segment, comprising: mounting laser displacement sensors on a thrust cylinder assembly plane of a tunnel boring machine, an emitting laser beam of each sensor being parallel to an axis of a cylinder, being perpendicular to the propulsion cylinder assembly plane, and pointing to the end surface of a segment ring to be tested; the intersection of the straight line where the laser of each laser displacement sensor is located and the propulsion cylinder assembly plane is referred to as a base point P; the intersection formed between the laser of each laser displacement sensor and said segment ring is referred to as a measurement point P'; the corresponding spatial coordinates of each base point are represented by P(x,y,z); the corresponding spatial coordinates of each measurement point are represented by P′(x′,y′,z′); a rear shield axis vector n=(x,y,z).