  Inspired by experiments on the magnetic field induced phases of the
spin-orbit coupled $2d$ Mott insulator $\alpha$-RuCl$_3$, we study some general
aspects of gapped $Z_2$ Quantum Spin Liquids (QSL) enriched by lattice
translation symmetry. We show that there are $12$ distinct such phases with
different implementations of translation symmetry. In some of these phases the
vison excitations of this QSL may form topological Chern bands. We explore a
phenomenological description of a putative $Z_2$ QSL as a candidate ground
state at intermediate magnetic fields in $\alpha$-RuCl$_3$. This state has
broad continuum spectra in neutron scattering, a "bosonic" thermal Hall signal
that goes to zero at zero temperature, and a natural connection with a zigzag
magnetic ordered state, all of which are also seen in $\alpha$-RuCl$_3$. On
general grounds continuum scattering will also be seen at multiple points in
the Brillouin zone in this state.
