<；P>；PROBLEM TO BE SOLVED: To provide a plastic-house pipe sufficiently bearing the load of snow when the load of snow is applied from above a plastic house so as to prevent the plastic house from collapsing. <；P>；SOLUTION: The plastic-house pipe is provided with a square pipe whose corner parts are formed into curved surfaces, and which has four side faces； wherein the center of each of the two side faces lying at the top and the bottom when the pipe is placed in parallel to the ground surface is provided with a groove (a curved surface groove 2) formed into an inwardly curved face, and each of the two side faces lying at the right and the left when the pipe is placed in parallel to the ground surface is provided with a slanted surface 3 whose center is formed so as to inwardly curve, so that the curved surface groove 2 formed at the top part repulses against the load when the load is applied on the top part, and the repulsive force caused inside acts on the slanted surface 3 when heavier load is applied on the top part, and thereby the plastic-house pipe is increased in the force to bear the load. <；P>；COPYRIGHT: (C)2009,JPO&INPIT
