The Works Of Messrs. Schneider And Co.

136 MESSRS. SCHNEIDER AND CO.’S WORKS. the posts across the width of the viaduct, and 3 metres (9 ft. 10 in.) lengthwise. The dimensions on the level of the masonry base are the following : — 75.700 m. Pier. 67.700 m. Pier. | 43.700 m. Piers. Width (transversely to axis of viaduct) Length m. ft. in. 15.098 49 6 10.065 33 0} m. ft. in. in. ft. in. 13.978 45 10 10.618 34 10 9.318 30 7 . 7.078 23 2f Thß posts are united together by means of stiffen- ing cross-bars, thus reducing the surface exposed to For the section of the posts and columns Messrs. Schneider and Co. have encleavoured to adhere, as far as was practicable, to a circular form, and adopted that produced by eight x y -bars, the sides of which form an angle of 112 deg. 30 min. with the web. They put down at their Creusot Works special roils for manufacturing these bars. The diameter of the circle inscribed in the section of the posts is .500 metre (19-J^ in.) the flanges of the sections are outside, which allows them to be united easily and increases their résistance. ■s o «O V' Ftcj.dTl Fig. 313. Details of Viaduct over the Rio Malleco, Chili. the force of the wind ; they form cross-stays with horizontal ties in the middle. The ties of all the piers correspond to each other in the same horizontal plane. The piers have all the same slope, and are, there- fore, absolutely identical one with the other at the same distance from the top. Beside the four corner posts above mentioned, which are reckoned upon to bear the vertical strains, there is in each pier a vertical column, which vserves to maintain the pier upright, and on which are fastened the cross-stays and horizontal ties. The section of this column is the same as that of the four corner posts. The foundation-plates of the posts are of steel 18 milli- métrés in.) thick, joined to the post by 16 ribs; they distribute the pressure equally on the masonry basement. The foundation-plate tie-rods are built in the masonry at several interinediate points. The beams of the top which carry the bearing arrangement are caisson-shaped, with three webs. They are united by tie-rods and diagonal bars, which act as stiffeners. The posts are fitted with wrought-iron foundation bolts, in 7.500 metres (24 ft. 7 in.) of masonry. The nuts are fixed hot, in order to prevent their becoming loose, which might occur