Page 240 - Bài 1 ok_Neat
P. 240
Figure 114- Pretensioned back-tie constructed with Trucker’s Hitch
The alignment of the front and rear anchor
points need to be within 15° either side of in-line
to the fall line (30° total width) (Figure 116). If
the angle of offset is greater than 15° out of
alignment, then employ two pretensioned back-
ties to balance the offset forces. This creates a
separate back-tie on either side of the
horizontal alignment line.
Two pretensioned back-ties can be constructed
with a single rope if the distances are not too
great, by starting at the focal point and splitting
the rope to use half the line rearward on each
back-tie.
Figure 115- Offset Back-tie Rigging
121 | P age
