Longspan stay-in-place liners

A structure-lining apparatus for providing a lining surface for a structure, the apparatus comprising:

• a plurality of transversely and longitudinally extending panels connectable to a surface of the structure and connectable edge-to-edge via complementary connector components on their longitudinally extending edges to define at least a portion of a lining surface, each panel comprising transversely extending edges generally orthogonal to their longitudinally extending edges;
• each panel comprising a first connector component on a first longitudinally extending edge thereof and a second connector component on a second longitudinally extending edge thereof, the second connector component complementary to the first connector component;
• each first connector component comprising a mounting tab for connecting the first connector to the surface of the structure;
• each panel comprises a longitudinally and transversely extending outer layer and a longitudinally and transversely extending inner layer at a location inwardly spaced apart from the outer layer;
• and
• each panel comprises a plurality of brace elements that extend between the inner layer and the outer layer wherein the plurality of brace elements comprise a first pair of immediately adjacent brace elements spaced apart by a first transverse space and second pair of immediately adjacent brace elements spaced apart by a second transverse space and wherein the first transverse space is greater than the second transverse space;
• wherein each panel has a transverse mid-plane and, for each panel, the first pair of immediately adjacent brace elements is further from the transverse mid-plane than the second pair of immediately adjacent brace elements is from the transverse mid-plane;
• and
• wherein a transverse direction is generally parallel to the transversely extending edges of the first panel and a longitudinal direction is generally parallel to the longitudinally extending edges of the first panel.