Abstract: A foundation is for an offshore structure. The foundation includes a wall forming a closed perimeter and a top deck attached to the upper end of the wall, wherein the wall and the top deck define a downwardly open hollow space. The wall includes a plurality of wall sections. Each wall section has a first elongated hollow body and a second elongated hollow body arranged inside the first elongated hollow body. The lower end of the first elongated hollow body is closed by an end member that is provided with an opening through which the lower end of the second elongated hollow body is arranged to extend. A method is for installing a foundation into the ground.

Abstract: A pile (100) includes a first elongated hollow body (101) having a first end and a second end, the first end being closed by an end member (103) provided with an opening (104). The pile (100) includes a second elongated hollow body (102) having a first end and a second end, the second elongated hollow body (102) being arranged inside the first elongated hollow body (101) so that the first end of the second elongated hollow body (102) extends through the opening (104) and is attached to the end member (103). A method is for installing a pile (100) into the ground.

Abstract: A grid (100) is for a tunnel thruster (200). The grid (100) includes a plurality of first radially extending bars (101) arranged at angular intervals from each other, and a plurality of first connecting bars (102). Each of the first connecting bars (102) are connected between adjacent first radially extending bars (101).

Abstract: A pump driven by the radiation energy of the sun, wherein the radiation energy is converted into mechanical energy by means of a liquid evaporated by the effect of the radiation heat. The pump has a face that absorbs radiation and a casing part whose inside space is divided into two parts by means of a flexible and elastic membrane that can be moved back and forth. One of the parts constitutes the intake space into which the liquid to be pumped is sucked during the intake phase while the membrane moves so that the intake space becomes larger. The intake space is connected to an intake opening provided with a valve, which valve permits flow only into the intake space, and to an exhaust opening provided with another valve, which other valve permits flow only out of the intake space. A tightly sealed evaporation space, which contains evaporable liquid, is placed between the casing and the membrane against the membrane, whereby the vapor pressure of the evaporable liquid directly moves the membrane.