Strengthened assembly enclosed in construction

A device intended to tighten aligned rectangular elements and comprising:

• a first part comprising means of winch (24) for applying a force, an intermediate part comprising cable means for transmitting said force over a distance and a third part comprising means for maintaining said force,
• said first part comprising a case having a flat surface for positioning said winch thereon for the application of said force, said means of winch (24) comprising means for rolling said cable means,
• said rectangular elements being beams of a group of materials comprising wood, plastic and concrete, some of them shrinking during drying,
• said first part being located within a top part of said beams,
• said third part being a lower part of said beams,
• said cable means tightened to a maximum by means of said winch (24) and by a corresponding ratchet (25), said cable means passing from a higher beam (36), through a passage within intermediate beams and ending in said lower part, around means of steel stem (21) welded onto a lower steel disc (26) which under the effect of tension of said cable compresses a compression spring (30) against an intermediate disc of steel (28) and against said intermediate beam (40).