A wall is built in the ground by pulling a wall building device having cross-sectional dimensions which are substantially equal to the dimensions of at least a part of the cross-section of the wall through the ground, at least a part of the wall being formed by injecting a hardenable material behind the wall building device. A tunnel is made by first making a tunnel wall, leaving the ground inside the tunnel wall substantially intact, followed by excavating the ground inside the tunnel wall.

Una pared es construida en la tierra tirando de un dispositivo del edificio de la pared que tiene dimensiones seccionadas transversalmente que sean substancialmente iguales a las dimensiones por lo menos de una parte de la sección representativa de la pared a través de la tierra, por lo menos una pieza de la pared que es formada inyectando un material endurecible detrás del dispositivo del edificio de la pared. Un túnel es hecho primero haciendo una pared del túnel, saliendo de la tierra dentro de la pared del túnel substancialmente intacta, seguido excavando la tierra dentro de la pared del túnel.

 
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