Pre-stressed molded wall, and method for creating such a wall

A method for making a prestressed retaining assembly including a diaphragm wall in the ground and a crowning structure capping said diaphragm wall, said method comprising:

• an excavation is made in the ground with a profile corresponding to that desired for the diaphragm wall,
• at least one anchor tube open at its upper end and closed at its lower end is placed in the excavation, so that its lower end is directed toward a bottom of the excavation,
• concrete is poured into a volume of the excavation outside said anchor tube, so as to form a concrete panel,
• after hardening of the concrete panel, a crowning structure is made overhanging the upper face of the concrete panel, so that the inside of the anchor tube remains accessible from the upper face of said structure,
• a cable is placed inside the anchor tube,
• a lower portion of the cable is fixed to a lower portion of the anchor tube,
• tension is exerted on the cable so as to place the cable in tension, and
• the cable is locked in tension with respect to the concrete panel and to the crowning structure.

A prestressed diaphragm wall in the ground, comprising:

• a concrete panel,
• at least one anchor tube having an upper portion and a lower portion, and open at its upper end and closed at its lower end, and embedded at least partially in the concrete panel,
• at least one cable extending inside the anchor tube, a lower portion of the cable being fixed to said tube,
• a cable anchoring system, configured to maintain the cable in tension and secure its upper portion to an upper portion of the concrete panel.