. Particolari di ponti a traliccio rivettati. Gli onali sono costituiti da due angoli posti indietro e rivettati per tutta la loro lunghezza. Una diagonale è rivettata lungo l'esterno della piastra di rinforzo su entrambe le corde mentre l'altra è rivettata all'interno. Al loro incrocio sono riveteti l'uno con l'altro. A volte direttamente e a volte mettendo la piastra asmall tra le due coppie di angoli. È preferibile che t 38 abbia questa piccola piastra per mantenere i contatori dritti. Un'altra forma comune di intersezione è mostrata da Pig.65.UNA piastra grande è usata all'intersezione ed al counte
1575 x 1587 px | 26,7 x 26,9 cm | 10,5 x 10,6 inches | 150dpi
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Questa immagine potrebbe avere delle imperfezioni perché è storica o di reportage.
. Details of riveted railroad truss bridges . onals are made up of two angles placed back to back and riveted atintervals along their length. One diagonal is riveted along theoutside of the gusset plate on both chords while the other oneis riveted on the inside. At their intersection they are riveteto each other. Sometimes directly and sometimes by putting asmall plate between the two pairs of angles. It is preferable t 38 have this small plate in order to keep the counters straight. Another common form of intersection is shown by Pig.65.A large plate is used at the intersection and the counter diagonalis broken. By this method of intersection large diagonals canhe crossed and much neater details secured at the upper andlower chord points. This detail is the better of the two methodsused, ajid can be used with any kind of cross section. There isan objection to this detail in the size of the plate used. Asomewhat neater but perhaps no more effective detail is that shownin Pig.66, The plate used in the connection instead of being a. large square plate is simply a plate the same width as the memberitself. This method works equally well for box sections as forthe particular detail shown which consists of two pairs of anglesand lattice bars. There is little doubt but that this detail isthe best of any detail shown for the intersection of two diagonalsIt is neat and effective, easy to put together, and rigid. Thereis no trouble in getting enough room for rivets as the length ofthe plate can be varied to suit. -39- Art, 8. Portal and Sway Bracinc Most of the details shown in the preceeding pages aremore or less uniform, but the details of the portal and swaybracing are far from uniform. In fact duplicate portals are rareinasmuch as the entire detail rests with the designer. The fastening of the two trusses together by means of aportal and sway bracing is an important detail. In the end postthis detail is especially difficult on account of the inclina, tionof that member. It
