It describes a multi-level structure, which is composed of multi-line (10) mountain personnel (12) and multi-line deck support personnel (20).Each supporting element (20) on the deck is at a top (12) top (10) of a row,In contrast, at least one deck support assembly (20) in a corresponding mountaineer (12) in an adjacent row (10) is based on the contour of a noncircular transverse portion, the principal axis (22) and the two axes (24),In use, the two axis (24) is usually parallel to the terrain using the political structure, and the main axis (22) is perpendicular to the two axis (24).
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