Section 24.39.80.352 - GUYLINES01.General Requirements. a. Guylines shall be of plow steel or equivalent, and in good condition.b. Guylines shall be provided in sufficient number, condition and location to develop stability and strength equivalent to the breaking strength of any component part of the rigging or equipment.c. Guylines shall be fastened by means of shackles or hooks and slides. The use of loops or molles for attaching guylines is prohibited. The use of wedge buttons on guylines is prohibited.d. The "U" part of a shackle shall be around the guyline and the pin passed through the eye of the guyline. Pins shall be secured with molles, cotter-keys, or the equivalent.e. Guylines shall be kept tightened while equipment or rigging they support is in use.02.Anchoring Guylines.a. Stumps used for fastening guylines and skylines shall be carefully chosen as to position, height and strength. They shall be tied back if necessary. See Figures 352.02.a. and 352.02.b. FIGURE 352.02.a.
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FIGURE 352.02.b.
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b. Properly installed deadman anchors are permitted. Guylines shall not be directly attached to deadman anchors. Suitable straps or equally effective means shall be used.c. Stumps, trees and guyline anchors shall be inspected from time to time while an operation is in progress and hazardous conditions immediately corrected.d. Standing trees which will reach landing or work areas shall not be used for guyline anchors.e. Any guyline anchor tree that can reach the landing or work area shall be felled before using as an anchor.03.Effectiveness of Guys.a. Guys making an angle with the horizontal greater than sixty (60) degrees will be considered less than fifty percent (50%) effective. For the effectiveness of other angles see Table 352.03.a. TABLE 352.03.a. |
Degree | Effectiveness |
60 to 45 | 50% to 75% |
45 to 30 | 75% to 85% |
30 to 10 | 85% to 95% |
b. For the effectiveness of guys according to the number of guys and their spacing, see Table 352.03.b. TABLE 352.03.b. |
No. of Guys Equally | Guys Most Effective When Pull Is: | Guys Will Support Strain Equal To The Following: |
3 | Opposite 1 guy | 100% of strength of 1 guy |
4 | Halfway between 2 guys | 140% of strength of 1 guy |
5 | Opposite 1 guy or halfWay between 2 guys | 160% of strength of 1 guy |
6 | Opposite 1 guy or halfway between 2 guys | 200% of strength of 1 guy |
7 | Opposite 1 guy or halfway between 2 guys | 225% of strength of 1 guy |
8 | Halfway between 2 guys | 260% of strength of 1 guy |
9 | Opposite 1 guy or halfway between 2 guys | 290% of strength of 1 guy |
10 | Opposite 1 guy or halfway between 2 guys | 325% of strength of 1 guy |
04.Minimum Guyline Requirements. A minimum of four (4) top guys are required on any portable spar tree used for yarding, swinging, loading or cold-decking.Idaho Admin. Code r. 24.39.80.352