| 摘要 |
The advertising board is used in roadside and motorway infrastructures for presentation of advertising-and-information materials. By it better visibility of the supplied information is achieved. It has higher stability against wind loading. It comprises a supporting column (1) to the upper end of which a bulky body is fitted, forming first (6) and second (7) face page and back page (8), opposite to which a front page (9) is made, which are welded together forming the bulky body (3) in the form of a trapezoid prism, open from its two bases. Each of the bases of body (3) has the form of an isosceles trapeze ABCD with angle alpha at its larger base (a) from 78 to 80 degrees. Vertical axis (11) of the supporting column (1) gets across the centre of gravity (G) of body (3), the distance (K) from the larger base (d) of the isosceles trapeze ABCD to vertical axis (11) being from 2.5 to 3.2 times smaller than distance (L) from axis (11) to the smaller base (b) of the isosceles trapeze ABCD. Bulky body (3) is connected to the upper end (2) of the supporting column (1) by means of a frame structure (12), fitted in the zone of the two bases of bulky body (3) and in the space between them, in the reach of the supporting column (1). The upper end of the frame structure (12 ) is found under the upper edges (5) of the bulky body (3), and its lower end is found above the lower edges of body (3). The lower end (23) of supporting column (1) is fitted to a two-stage foundation (24) by means of a supporting plate.
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