CONCRETE PLACING JOINT STRUCTURE AND JOINTING METHOD

PROBLEM TO BE SOLVED: To provide a concrete placing joint structure and a jointing method for preventing the occurrence of crack. SOLUTION: In the concrete placing joint structure of a first concrete part being a large cross section part and a second concrete part being a small cross section part, an end face of a jointing connection part of the first concrete part 1 with the second concrete part 2 is formed to have the same end face shape and cross sectional area as an end face shape and cross sectional area of an end face of a jointing connection part of the second concrete part 2. A jointing connection part 5 having parts having the same cross sectional area between the predetermined dimension of length from the end face of the jointing connection part is provided in the first concrete part 1 as a part of the second concrete part 2, and concrete for the second concrete part is placed to connect with the jointing connection part 5 in the first concrete part and construct the second concrete part 2. After the jointing connection part is provided in the first concrete part, concrete for the second concrete part is placed. COPYRIGHT: (C)2010,JPO&INPIT