The synthesis of superheavy elements has advanced strongly recently and their main observed decay mode is alpha emission. Predictions of alpha decay half-lives of other possible superheavy nuclei are needed. The alpha decay potential barrier is often described using a finite square well for the one-body shapes plus an hyperbola for the Coulomb repulsion between the alpha particle and its daughter. An arbitrary adjustment of the parameters allows to reproduce roughly the experimental data. Here the alpha decay potential barriers are determined in the cluster-like shape path within a generalized liquid drop model including the proximity effects between the alpha particle and the daughter nucleus and adjusted to reproduce the experimental Qalpha. The ? emission half-lives are deduced within the WKB penetration probability through these barriers.