An interconnecting system comprising - a first structure extending in a longitudinal direction and formed as a surface structure, a second structure extending at least in the longitudinal direction and arranged parallel to the first structure with respect to the longitudinal direction and formed as a supporting structure for supporting the surface structure, and a connecting device extending perpendicularly through the structures in an axial direction, - wherein the structures are made of different materials having different coefficients of thermal expansion, - the structures are fastened to one another on the one hand at a fastening point and are additionally connected to one another at a connecting point with a longitudinal offset with respect to the fastening point by means of the connecting device by providing a specific mounting normal force effective between the structures, - the structures each have, in the region of the connecting point, a receiving means (8, 9) for receiving a respective device section (11, 12) of the connecting device - wherein one of the receiving means is larger in longitudinal direction than the device section arranged in this enlarged receiving means, such that the connecting device is arranged displaceable in the corresponding structure in longitudinal direction, - wherein the connecting device comprises connecting means with a first axial stop, a second axial stop which is axially adjustable in the axial direction of the connecting device, a spacer sleeve, an axially acting sealing element and a clamping element, and - wherein, in each case in the assembled state, the spacer sleeve is arranged between the axial stops (15, 17) and engages around the connecting means in in such a way that, in the assembled state, the connecting device has a minimum axial clamping force between the axial stops (15, 17), the sealing element is arranged between the supporting structure and the surface structure, and the clamping element for transmitting the mounting normal force is arranged between the first axial stop and the surface structure. - a first structure extending in a longitudinal direction and formed as a surface structure, a second structure extending at least in the longitudinal direction and arranged parallel to the first structure with respect to the longitudinal direction and formed as a supporting structure for supporting the surface structure, and a connecting device extending perpendicularly through the structures in an axial direction, - wherein the structures are made of different materials having different coefficients of thermal expansion, - the structures are fastened to one another on the one hand at a fastening point and are additionally connected to one another at a connecting point with a longitudinal offset with respect to the fastening point by means of the connecting device by providing a specific mounting normal force effective between the structures, - the structures each have, in the region of the connecting point, a receiving means (8, 9) for receiving a respective device section (11, 12) of the connecting device - wherein one of the receiving means is larger in longitudinal direction than the device section arranged in this enlarged receiving means, such that the connecting device is arranged displaceable in the corresponding structure in longitudinal direction, - wherein the connecting device comprises connecting means with a first axial stop, a second axial stop which is axially adjustable in the axial direction of the connecting device, a spacer sleeve, an axially acting sealing element and a clamping element, and - wherein, in each case in the assembled state, the spacer sleeve is arranged between the axial stops (15, 17) and engages around the connecting means in in such a way that, in the assembled state, the connecting device has a minimum axial clamping force between the axial stops (15, 17), the sealing element is arranged between the supporting structure and the surface structure, and the clamping element for transmitting the mounting normal force is arranged between the first axial stop and the surface structure.