DEVICE FOR MEASURING CRACKS OF CONCRETE FOR SUPERVISION BY EXPANDING AND CARVING SCALE OF RULER IN CONVEX LENS OF SPECTACLE

摘要

PURPOSE: A concrete crack detector is provided to easily inspect a crack measurement of a concrete by expanding and carving a scale of a ruler in a spectacle and having a headlight. CONSTITUTION: A scale of a ruler(5) for a crack measurement is carved in a lens(1) by expanding. A hinge(3) is formed in a lens frame(2) to be auxiliary fix the lens by shielding. A U-shaped transparent fixing jig(4) is hinged with the lens frame. A measured object is measured by facing the lens frame. A headlight(8) is installed in a connected portion between the lens frame and a handle(6). A battery(9) for the headlight is inserted inside the handle. A measuring tape(7) is installed in the rear side of the handle by a connection hook(10). Thereby, the effective supervision is performed.