METHOD FOR GROUT INJECTION TO INNER CABLE OF PRESTRESSED CONCRETE STRUCTURE OF POST-TENSIONING SYSTEM

摘要

PROBLEM TO BE SOLVED: To solve the problem that it is difficult to check whether an inner cable is filled with grout without leaving a dead air space in a conventional method for grout injection into the inner cable of a prestressed concrete structure of a post-tensioning system because a sheath provided with the inner cable is hidden in the concrete, actually.;SOLUTION: The method for grout injection is carried out in a manner that a test is conducted by injecting the grout into a full-length test body assembled outside a construction site, and includes a cable whose sheath has the same three-dimensionally arranged structure as the inner cable at the construction site, or into a sectional test body composed of a cable having a length at which a dead air space is likely formed. Then the grout injection is performed by conducting the test under a plurality of test conditions, and the best condition for injecting the grout is selected based on results of the test which is applied to the construction site. Thus, the prestressed concrete structure of the post-tensioning system is provided wherein no dead air space is formed inside the sheath and no danger of the corrosion or disconnection of a PC steel used for the cable is caused.;COPYRIGHT: (C)2004,JPO