Page 239 - Bài 1 ok_Neat
P. 239

Figure 113- Pretensioned Back-Tie with three strands


               An alternate method of constructing a pretension back-tie over a long span or with
               limited rope is to simply employ a Trucker’s Hitch (Figure 115).   The single strand of
               knotted 11 mm rope joining the anchor points, has a breaking strength of 20 kN (4,496
               lbf), which is equal to the strength of the main line. When a rigid link is not critical,
               because the front and rear anchor points are individually sturdy, this creates an
               adequate back-tie rigging technique.























               120 | P age
   234   235   236   237   238   239   240   241   242   243   244