WATERPROOF STRUCTURE OF CONNECTIVE PORTION OF PRECAST CONCRETE SEGMENT BLOCK

摘要

PURPOSE: A waterproof structure of a connective portion of a concrete block is provided to perform a waterproof function even in a state that an expansion tube is expanded as well as not expanded. CONSTITUTION: As time passes, a fluent material injected in an expanded tube(20) is gradually leaked outside. In this process, a second protruding unit(24) is gradually separated from a second concave portion(14). On the other hand, a first protruding unit(22) is adhered to a first concave portion(14). Herein, a wedge shape of a connective unit(16) induces the first protruding unit to be more tightly adhered to the first concave portion. Thereby, even if a waterproof function is not secured by the second protruding unit, the waterproof function is secured by the first protruding unit.