Abstract: Comprising a body (1) constituted by a flexible and reversibly deformable material, in order to prevent its breakage in the event of being run over.

Abstract: Pieces for modular construction, that allow the construction of greenhouses both for industrial and domestic use, as well as of any type of construction, adaptable to any form and size, for which the longitudinal piece has some longitudinal channels (1), and on each circular ends (2) and (3), one female (2) and another male (3), wherein both have some perforations (4) and (5), while the end (3) has some truncated conical nipples (7) and the end (2) has some complementary truncated conical perforations (6). For curved constructions the longitudinal pieces are joined by means of a piece (8) which likewise has some channels (9), a central perforation (10) and other perforations (11), as well as truncated conical perforations (12) and (13).