<；P>；PROBLEM TO BE SOLVED: To provide a coupler holding a pipe having relatively various kinds of diameters in a cross state without complicating its constructional elements, and also facilitating calculation of the strength of an assembled hothouse structure. <；P>；SOLUTION: The coupler includes a pair of U-shaped holding members holding a first skeleton material, and a plate-like member provided with hole parts through which the opening side ends of the U-shaped holding member are passed and a recessed catching part catching a second skeleton material intersecting with the first skeleton material. Male threads threaded on the opening side ends are threadedly engaged to female thread members while being inserted into the hole parts so as to connect the first skeleton material with the second skeleton material in an intersecting condition. <；P>；COPYRIGHT: (C)2010,JPO&INPIT
