  Nuclear pairing interaction plays a crucial role in both
macroscopic-microscopic and fully macroscopic descriptions of nuclei. In the
present study we discuss different pairing interactions (monopole and delta
pairing forces) and the methods allowing for the particle number symmetry
restoration in addition to the customary BCS treatment of pairing correlations
in the context of $\alpha$-decay half-lives for superheavy nuclei. The
calculations are done in the macroscopic-microscopic framework for even-even
nuclei with Z > 110.
