Abstract: The invention relates to a tunnel lining composed of at least two concrete elements (10) each having at least one protective element (20) connected to the concrete element, wherein the protective element (20) has a protective portion which has a first side which faces the concrete element (10) and on which there is provided at least one connecting element (17) for producing a retaining connection between the protective portion and the concrete element (10), wherein the protective portion consists of at least one plastic, wherein the protective element (20) has at least one protective element seal (30) which is connected to the protective portion (20), wherein the connection to the protective portion (20) is gas-tight and liquid-tight, wherein a joint (40) is present between the at least two concrete elements (10) arranged to form the tunnel lining (300), wherein the joint (40) is sealed in a gas-tight and liquid-tight manner with respect to the tunnel interior (100) by at least one protective element seal (30

Abstract: The invention relates to a tunnel lining composed of at least two concrete elements (10) each having at least one protective element (20) connected to the concrete element, wherein the protective element (20) has a protective portion which has a first side which faces the concrete element (10) and on which there is provided at least one connecting element (17) for producing a retaining connection between the protective portion and the concrete element (10), wherein the protective portion consists of at least one plastic, wherein the protective element (20) has at least one protective element seal (30) which is connected to the protective portion (20), wherein the connection to the protective portion (20) is gas-tight and liquid-tight, wherein a joint (40) is present between the at least two concrete elements (10) arranged to form the tunnel lining (300), wherein the joint (40) is sealed in a gas-tight and liquid-tight manner with respect to the tunnel interior (100) by at least one protective element seal (30

Abstract: The invention relates to a protective element for connecting to a concrete element of a tunnel extension, which has a protective section having a first side facing the concrete element (10), on which first side at least one connecting element (17) is provided for establishing a retaining connection of the protective section to the concrete element (10), wherein the protective section is made from at least one plastic material, characterized in that the protective section (20) has at least one drainage element (40) through which a fluid can pass from the first side of the protective section (20) to the opposite side of the protective section (20) facing away from the concrete element (10).

Abstract: The invention relates to a protective element for connecting to a concrete element of a tunnel extension, which has a protective section having a first side facing the concrete element (10), on which first side at least one connecting element (17) is provided for establishing a retaining connection of the protective section to the concrete element (10), wherein the protective section is made from at least one plastic material, characterized in that the protective section (20) has at least one drainage element (40) through which a fluid can pass from the first side of the protective section (20) to the opposite side of the protective section (20) facing away from the concrete element (10).

Abstract: An electrostatic transducer has two oppositely disposed counter-electrodes and a diaphragm which is disposed between the two counter-electrodes and which has a first weakly conductive coating. In its edge region the diaphragm has a second well-conductive coating on the first coating to protect the latter.

Abstract: An electrostatic transducer has two oppositely disposed counter-electrodes and a diaphragm which is disposed between the two counter-electrodes and which has a first weakly conductive coating. In its edge region the diaphragm has a second well-conductive coating on the first coating to protect the latter.