Abstract: A modular unit for constructing a modular structure is described. The modular unit comprises a structural frame, which includes at least one upper beam, at least one lower beam, and at least one column extending between said upper and lower beams and connected therebetween. At least one of said upper or lower beams is arranged to define at least one chamber for receiving a building material therein along at least a portion of its length, said column being connected to said portion of said beam. Part of said beam is removed along said portion of said beam to define at least one opening to said chamber.

Abstract: An arch structure (12) comprising several struts (14) interconnected by five joints (15) to form an arch (16), and two series of cables (17, 18). The two ends of the arch (16) rest on ball joints which are fixed to the ground.