METHODS OF HAULING IN TUNNELS 



CHAPTER VI. 

 METHODS OF HAULING IN TUNNELS. 



THE transportation from one point to another within the 

 tunnel and its shafts of any material, whether it is excavated 

 spoil or construction material, is defined as hauling. In all 

 engineering construction, the transportation of excavated 

 materials, and materials for construction, constitutes a very 

 important part of the expense of the work; but hauling in 

 tunnels where the room is very limited, and where work is 

 constantly in progress over and at the sides of the track, is a 

 particularly expensive process. Hauling in tunnels may be 

 done either by way of the entrances, or by way of the shafts, 

 or 1>\ way of both the entrances and shafts. 



Hauling by Way of Entrances. When the hauling is done 

 by the way of the entrances, the materials to be hauled are. 

 t;i km directly from the point 

 of construction to the en- 

 trances, or in the opposite di- 

 rection, by means of special 

 cars of different patterns. For 

 general purposes, these differ- 

 ent patterns of ears may l>c 

 grouped into three classes, 

 platform-cars, dump-can, and 

 box-cars. Representative ex- FI... w. - Platform cr for Tunnel Work, 

 amples of these several classes 



of care are shown in Figs. 34 to 37 * inclusive, but it will lw 

 readily understood that there are many other forms. 



Briefly described, platform-cars (Fig. 84) consist of a 



Reproduced from catalogue of Arthur Koppel. New York. 



