Courbure des tissus en courbes

For any d-web by curves in an ambiant n-dimensional manifold, we define a tautological connection on some associated bundle, whose curvature vanishes iff the web has a maximal (n-1)-rank. As an application we recover, with the help of a Maple programm, that the exceptional 6-web $W_{0,6}$ in dimension 3 (as well as his 4 and 5-subwebs) have maximal rank.