A ground electrode-coupling device functionally joined to a cylindrical body, with internal cylindrical form and external conical form. The device includes an internal blockage dividing the device into two cavities. The device also includes at least an orifice in each cavity communicating the internal coupling with the external coupling, for enabling the release of the air by coupling the bodies. The external form is a conical geometry for reducing the resistance of the device by being inserted in a solid medium.