How long is the bar binding of raft foundation?

Binding of raft foundation reinforcement: before binding slab reinforcement, the sundries on the cushion should be removed. Play the spacing line of the main reinforcement on the cushion, and the starting reinforcement is 50mm away from the side. The eight-character buckle should be used for steel bar binding, and all joints of plate steel bars should be fastened. Galla reinforcement should be adopted between the double-plate steel bars, with the spacing of φ 12 @ 600 mm× 600 mm, and HRB400 steel bars with diameters of 22 and 25 should be adopted as the raft foundation steel bars; The reinforcement connection mode is sleeve connection. The length of the connection section of the steel bar sleeve connection joint is 35d(d is the larger diameter of the longitudinal reinforced bar).