Anti - line chi of hull structure datum line

The utility model discloses an anti - line chi of hull structure datum line, including the fixed folding rule of bisymmetry, each folding rule is including stiff end fixed each other and the extension end that is located the opposite side, and the stiff end is connected with the section of bending with extending between the end, and the stiff end of two folding rules overlaps and fixed connection each other, and the extension end of two folding rules is opened to both sides respectively and be parallel each other, and the width homogeneous phase of the extension end of two folding rules etc. Extend the side of holding and are located the planar vertical plane of same perpendicular to folding rule on two folding rules. This anti - line chi is with the datum line coincidence of the distolateral limit of the extension of one side folding rule on one side of the steel sheet when using, make another folding rule be located the another side of steel sheet, can be with the opposite side of the anti - line of datum l