A method for manufacturing foundations for uprights by using metal sheets embedded by vibration or by percussion comprising the steps of: a. arranging at least two sheets, each sheet being provided with position adjustment means with respect to a connection element between the sheet itself and a connector between the sheet and upright; b. arranging a connector between the sheet and upright, adapted to be integrally connected to said upright and provided with position adjustment means with respect to a connection element between the sheet and the connector itself; c. arranging at least one connection element between each sheet and the connector, each connection element being provided with first position adjustment means, adapted to adjust the position thereof with respect to the sheet and second position adjustment means, adapted to adjust the position thereof with respect to the connector; d. arranging a centering system according to any of claims 15 to 17 below for the sheets, which can be associated operationally with an embedding machine; e. embedding said sheets into the ground by vibro-embedding or by percussion, with the aid of the centering system; f. positioning the connector in the design position, adjusting the relative position between: - each sheet and each connection element by means of said position adjustment means of the sheet and said first position adjustment means of the connection element; - each connection element and the connector by means of said position adjustment means of the connector and said second position adjustment means of the connection element; g. locking such positions. a. arranging at least two sheets, each sheet being provided with position adjustment means with respect to a connection element between the sheet itself and a connector between the sheet and upright; b. arranging a connector between the sheet and upright, adapted to be integrally connected to said upright and provided with position adjustment means with respect to a connection element between the sheet and the connector itself; c. arranging at least one connection element between each sheet and the connector, each connection element being provided with first position adjustment means, adapted to adjust the position thereof with respect to the sheet and second position adjustment means, adapted to adjust the position thereof with respect to the connector; d. arranging a centering system according to any of claims 15 to 17 below for the sheets, which can be associated operationally with an embedding machine; e. embedding said sheets into the ground by vibro-embedding or by percussion, with the aid of the centering system; f. positioning the connector in the design position, adjusting the relative position between: - each sheet and each connection element by means of said position adjustment means of the sheet and said first position adjustment means of the connection element; - each connection element and the connector by means of said position adjustment means of the connector and said second position adjustment means of the connection element; - each sheet and each connection element by means of said position adjustment means of the sheet and said first position adjustment means of the connection element; - each connection element and the connector by means of said position adjustment means of the connector and said second position adjustment means of the connection element; g. locking such positions.