JOINING SYSTEM FOR IN-CORNER MEMBERS

A joining system for in-corner members for a mold is provided to prevent panel contact portions of the in-corner member from being wider by providing a support piece to a connection unit. A joining system for in-corner members for a mold comprises a panel, in-corner members(C), and a connection unit(J). The panel has lateral members with holes. The in-corner member includes a structure contact part and a panel contact part. The structure contact part is shorter than a concrete structure, and corresponds to the angle of the in-corner of the concrete structure. The panel contact part includes two main panels(11A,11B), which meet each other at a main edge(13). The in-corner member includes two auxiliary panels(21A,21B). Both auxiliary panels connect with the main panel of the structure contact part at an auxiliary edge(23), and couple with the panel by inserting pins into slots(22). The connection unit includes a fitting portion having main support portions(41A,41B) and auxiliary support portions(43A,43B). The main support portion contacts with the outer surface of the main panel of the in-corner member. The auxiliary support portion contacts with the outer surface of the auxiliary panel of the in-corner member. Support pieces(49A) are attached to the lateral side of the auxiliary support portion.