6.4.3   Securing of the coil
The coil is secured according to the principles in chapter 5. The friction coefficient is taken transversely as 0.4 due to form fit and the contact timber/timber, but longitudinally as 0.3 due to the contact steel/timber. The effect of the soft soap should be compensated by subsequently connecting the upper with the lower beams by cramps, bolts or angle joints. Thus, a residual securing demand remains against longitudinal accelerations of 0.7 g and transverse accelerations of 0.4 g.

The residual longitudinal securing effort of 17 · 0.7 · 9.81 = 117 kN is achieved by lashings and by pressure elements to the end walls and corner posts. The pressure elements consist of two timbers of 15 x 15 cm cross-section, secured against falling loose and against buckling due to their length. Only four of the securing points bear simultaneously to fore or aft. The lashings also have a transverse effect.

The residual transverse securing effort of 17 · 0.4 · 9.81 = 67 kN is achieved by lashings and by pressure elements to each side. Only three securing points are loaded simultaneously. However, due to the unfavourable lashing angles only two points are considered in the transverse balance.




Figure 32: Longitudinal and transverse lashing of the coil




Figure 33: Longitudinal and transverse shoring of the coil



The arrangement is checked by a balance:


Longitudinally: 1 · 9.81 · 17 ≤ 0.3 · 17 · 9.81 + (4 · 10 + 2 · 225 · 0.3) / 1.5
  167 ≤ 50 + 117
  167 = 167 Balance is just met!


Transversely: 0.8 · 9.81 · 17 ≤ 0.4 · 17 · 9.81 + (2 · 10 + 3 · 100 · 0.3) / 1.5
  133 ≤ 67 + 173
  133 < 140 Balance is just met!



The securing effort is less than in the previous example. The quality however, is even more important due to the increased mass of the coil. Due to the marginal satisfaction of the balances, good workmanship is of particular concern.
 
 

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