  We use a simple analytic model to compute the angular correlation function of
clusters identified in upcoming thermal SZ effect surveys. We then compute the
expected fraction of close pairs of clusters on the sky that are also close
along the line of sight. We show how the expected number of cluster pairs as a
function of redshift is sensitive to the assumed biasing relation between the
cluster and the mass distribution. We find that, in a LambdaCDM model, the
fraction of physically associated pairs is 70% for angular separations smaller
than 20 arcmin and clusters with specific flux difference larger than 200 mJy
at 143 GHz. The agreement of our analytic results with the Hubble volume N-body
simulations is satisfactory. These results quantify the feasibility of using SZ
surveys to compile catalogues of superclusters at any redshifts.
