374 MISCELLANEOUS STRUCTURES 



The interior and wall columns were substantially similar in con- 

 struction, both being composed of two channel sections made up of 

 plates and angles, held together by a double lacing of 2^/2 x ^-in. bars. 

 Fig. 1 80 shows the column construction in detail. Each column is 

 founded on a concrete pier with a granite capstone. The concrete in 

 these piers and for all other foundation work was composed of I part 

 Portland cement, 2 parts clean sharp sand and 5 parts stone broken to 

 pass a 2-in. ring. In making the concrete the sand and cement will 

 first be mixed dry and then wet, and the wet mortar will then be mixed 

 with the broken stone as it comes moist from washing. The shape of 

 the column piers is indicated in Fig. 177, and the columns are fastened 

 to them by four anchor bolts for each column. The columns are fin- 

 ished by milling machine at both top and bottom, and are capped and 

 stiffened at the tops to provide a bearing for the 4- ft. i^-in. plate 

 girders carrying the 120- ton crane tracks. 



The track construction for the bridge cranes is shown in detail in 

 Figs. 177 and 180. As already stated, the tracks for the 120-ton cranes 

 are carried on plate girders resting directly on the tops of the columns, 

 and running lengthwise of tKe building. These track girders are 4 ft. 

 ijii ins. deep back to back of flange angles and have spans of 20 ft., 

 c. to c. of columns. They are milled square at the ends and the rivets 

 of the end angles have flat heads. To allow for expansion the ends are 

 not butted close together, but are separated by a clear space of ^4 -in.,. 

 by the construction shown in Fig. 180. From the drawing it will be 

 seen that each girder span has one fixed and one expansion end, the 

 expansion being provided for by the slotted rivet holes in the bearing 

 plate and by the space between the ends of the girders. An exactly simi- 

 lar expansion end construction is provided for the girders carrying 

 the tracks for the 35-ton and lo-ton cranes. These three tracks are on 

 the same level and the girders supporting them are carried by ftrackets 

 on the main columns. This bracket and girder construction is shown 

 in Fig. 177. 



The crane tracks proper consist of ordinary railway rails laid di- 

 rectly on the special cover plate forming part of the top flange of each 

 track girder, to which they are attached by stamped steel clips riveted 

 to the cover plate. For the i2O-ton cranes the rails weigh 150 Ibs. per 

 yard, for the 35-ton cranes they weigh 85 Ibs. per yard, and for the 10- 

 ton cranes they weigh 70 Ibs. per yard. The joints are located over the 

 expansion joints at each column and are spaced J^-in. open, the angle 



