Ocean Grove has reopened part its damaged pier — which is built in the shape of a Christian cross — as it prepares for an influx of summer visitors amid an ongoing battle with state officials over Sunday morning access to the beach. Workers installed a fence across the middle of the pier Tuesday, blocking access to the portion of the walkway that extends over the water. The pier has been closed for months due to an ongoing structural investigation. The public is now able to walk on 243 feet of the 500-foot-long structure off the Ocean Grove boardwalk, said Gina LaPlaca, business administrator …