Rashi Z”L explains Koleiv himself went there and he was Mispallel on Kivrei Avos. Rav Chaim Liberzohn Z”L of Chernobyl who accepted from his father Hachosid Rav Yeshaiya who had biKabala from Rav Shloima of Karlin ZY”A related to me, that if a person comes to the Kever Avos or the Kever of a Tzadik, he should stand at the doorway of the Beis HaChaim and say such, “Perhaps the Nefesh of the Tzaddik that I came to his Kever is not currently in his Kever, then I will light a Ner for the first Neshoma that will notify (his ancestors) or the tzaddik that I, פב"פ have come to Daven on his Kever. Then all the Neshomos will quickly go to notify, as each one wants to be the first one before the others to notify that one has come to the Kever.”
Sefer Shema Shloima, Kisvei Rav N”N, Rav of Kalbiel
