Method and apparatus for lifting and leveling a concrete panel

摘要

A lifting apparatus to be embedded within a precast concrete panel or slab to enable the panel to be lifted, positioned atop a road bed, and elevated above the road bed. A lifting apparatus is located at each corner of the panel. Each lifting apparatus has a threaded sleeve extending through the panel to receive a removable threaded lifting bolt by which to establish a lifting point at which a lifting force is applied to lift and position the panel. When the threaded lifting bolt is rotated completely through the threaded sleeve, a pushing force is applied against a base plate, whereby to elevate the panel above the road bed as is necessary to make the panel level with adjacent panels during the construction or repair of a roadway. Grout is pumped through the panel to fill the space between the panel and the road bed.

主权项

1. An apparatus embedded within a concrete panel to enable the concrete panel to be lifted and transported to a surface and elevated above the surface, wherein the concrete panel has a top and a bottom and said apparatus comprises:
a threaded sleeve having a length so as to extend through the concrete panel between the top and the bottom thereof; an elevator lying at the bottom of the concrete panel below said threaded sleeve; a sleeve support affixed to and standing upwardly from said elevator so that said threaded sleeve is removably received within and surrounded by said sleeve support; and a threaded lifting bolt removably connected to said threaded sleeve and having first and opposite ends, the first end of said threaded lifting bolt positioned relative to the concrete panel so as to receive rotational forces applied thereto in first and opposite directions and a lifting force applied thereto by which the concrete panel is lifted and transported to the surface, wherein a rotational force applied in said first direction to the first end of said threaded lifting bolt rotates said threaded lifting bolt downwardly and axially through said threaded sleeve so that the opposite end of said threaded lifting bolt applies a pushing force against said elevator for causing said elevator to be displaced from the bottom of the concrete panel until said elevator and said sleeve support affixed thereto are detached from the concrete panel and said elevator is pushed against the surface to which the concrete panel has been transported, whereby a corresponding uplifting force is generated for elevating the concrete panel above the surface, and wherein a rotational force applied in said opposite direction to the first end of said threaded lifting bolt rotates said threaded lifting bolt upwardly and axially through said threaded sleeve, whereby said threaded lifting bolt is removed from said threaded sleeve.