Central airfoil box comprising a connecting rod and an adjustable anchoring system

A central airfoil box comprising:

• two beams, each beam having a wall pierced with a first bore centered on a first axis,
• a connecting rod comprising, for each wall, a yoke joint having two flanks arranged on either side of the wall and pierced with a bore, and in which each yoke joint is fixed to the wall by a fixing system,
• at least one of the fixing systems comprising an anchoring system which comprises:
• a bearing lodging in the first bore, and being pierced with a second bore centered on a second axis parallel to said first axis and offset relative to said first axis,
• a cylindrical shoulder, secured to and coaxial with the bearing and configured to come to bear against the wall, an outer perimeter of the shoulder having a plurality of splines,
• at least one block fixed to the wall around the first bore and configured to lodge in one of the splines, and
• a shaft lodging in the second bore and the bores of the yoke joint.