Compaction Strand Wire Rope Construction (8×K19S-IWRC)
Product Description
Compaction Strand Wire Rope Construction (8×K19S-IWRC)
- Dawson Group Ltd. - China Manufacturer, Supplier, Factory
Nominal Diameter | Approx.Weight | Nominal Tensile Strength of Rope (MPA) | ||||||||
1570 | 1670 | 1770 | 1870 | |||||||
Minimum Breaking Load of Rope | ||||||||||
FC | IWR/IWS | FC | IWR/IWS | FC | IWR/IWS | FC | IWR/IWS | FC | IWR/IWS | |
mm | kg/100m | KN | ||||||||
16 18 20 22 24 26 28 | 104 131 162 192 233 274 318 | 127 160 198 240 285 335 388 | 133 168 207 251 298 350 406 | 165 209 257 312 371 453 505 | 140 179 220 267 317 373 432 | 175 222 274 331 394 463 573 | 150 189 234 283 336 395 458 | 186 235 290 351 418 419 569 | 158 200 247 299 355 417 484 | 196 248 307 371 442 518 601 |
30 32 34 36 38 40 42 44 46 48 | 364 415 468 525 585 648 714 784 857 933 | 446 507 572 642 715 792 873 958 1050 1140 | 466 513 599 671 748 829 914 1000 1100 1190 | 579 659 744 834 930 1030 1140 1250 1360 1480 | 469 564 637 714 796 882 972 1070 1170 1270 | 616 701 792 887 989 1100 1210 1330 1450 1580 | 526 598 675 757 843 935 1030 1130 1240 1350 | 653 743 839 941 1050 1160 1280 1400 1540 1670 | 555 632 713 800 891 987 1090 1190 1310 1420 | 690 785 886 994 1110 1230 1350 1480 1620 1770 |
50 52 54 56 58 60 62 64 66 68 70 | 1010 1100 1180 1270 1360 1460 1560 1660 1760 1870 1980 | 1240 1340 1440 1550 1670 1780 1900 2030 2160 2290 2430 | 1300 1400 1510 1620 1740 1870 1990 2120 2260 2400 2540 | 1610 1740 1880 2020 2170 2320 2470 2640 2800 2980 3150 | 1380 1490 1610 1730 1850 1980 2120 2260 2400 2550 2700 | 1710 1850 2000 2150 2300 2460 2630 2800 2980 3170 3360 | 1460 1580 1700 1830 1960 2100 2250 2390 2540 2700 2860 | 1810 1960 2120 2280 2440 2610 2790 2970 3160 3360 3560 | 1540 1670 1800 1940 2080 2220 2370 2530 2690 2850 3020 | 1920 2070 2240 2400 2580 2760 2950 3140 3340 3550 3760 |
Note: the minimum aggregate breaking force = minimum breaking load ×1.214(FC)or1.260(IWR/IWS).
Hitches
1. Vertical- The Vertical, or straight, attachment is simply using a sling to connect a lifting hook or other device to a load. Full rated load of the sling may be used, but never exceeded. A tagline should be used on such a lift to prevent rotation, which can damage the sling. A wire rope sling with a hand-tucked splice can unlay and fail if the sling is allowed to rotate.
2. Choker- Choker Hitch configurations reduce the rated capacity of a sling by 20 to 25 percent. If a load is hanging free, the normal choke angle is approximately 135°. When the choke angle is less than 120°, an adjustment in the choker rated capacity must be made(see illustration below). Extreme care should be taken to determine the choke angel as accurately as possible. As indicated in the table below, the decrease in rated capacity is dramatic.
Choker Hitch
RATED CAPACITY ADJUSTIMENT
Choke IWRC and Fiber Core Rope
Angle Percent of
(Degrees) Choker Rated Capacity
Over 120 100
90-120 87
60-89 74
30-59 62
Up to 29 49
Angle Adjustment
Rated capacity adjustment for slings in choker hitch when angle is less than 120°. Choke angles greater than 135° are unstable and should not be used.
3. Basket- Basket hitched distribute a load equally between the two legs of a sling, within limitations imposed by the angles at which legs are rigged to the load(see discussion of sling angles).
Basket Hitch
CAPACITY ADJUSTMENT
Angle Percent of Single Leg
(Degrees) Capacity
90 200
60 170
45 140
30 100
Angle
A basket hitch has twice the capacity of a sling leg only if legs of sling are vertical, and only if D/d ratio is 25:1 and it is vertical. D/d>25:1 per ANSI B30.9.
WARNING: Do not use, or allow the use of the products in this catalogue, unless the user has read and understands the applicable instructions and product warnings. Information available upon request.
Reeving
Revving through connections to load increases load on connections fitting by as much as twice.
Do not reeve.
Triple and Quad Leg Slings
Triple leg slings have 50% more capacity than double leg only if the center of gravity is in center of connection points and the legs are adjusted properly(equal share of the load)
Quad leg slings offer improved stability but do not provide increased lifting capacity.
Center of Gravity(COG)
The location of the center of gravity to the pick points is an important consideration.
COG and Sling Loading
When lifting vertically, the load will be shared equally if the center of gravity is spaced equally between the pick points, as in the first illustration at right. If the weight of the load is 10,000 lbs., then each sling will have a load of 5,000 lbs. and each shackle and eyebolt will also have a load of 5,000 lbs.
When the center of gravity is not equally spaced between the pick points, as in the second illustration, the slings and fittings will not carry an equal share of the load. The sling connected to the pick point closest to the center of gravity will carry the greatest share of the load. Sling 2 is closest to COG. It will have the greatest share of load.
Sling 2 = 10,000 × 8 /(8+2)= 8,000
Sling 1 = 10,000 × 2 /(8+2)= 2,000
WARNING: Do not use, or allow the use of the products in the catalogue, unless the user has read and understands the applicable instructions and product warnings. Information available upon request.
Sling Angle
Sling angle (also called angle of loading) is the angle measured between a horizontal plane and the sling leg or body. This angle is very important and can have a dramatic effect on the rated capacity of the sling (see illustration below) . As illustrated at right, when this angle decreases, the load on each leg increases. This principle applies whether one sling is used to pull at an angle, in a basket hitch, or for multilegged bridge slings. Sling angles of less than 30° shall not be used.
Angles and Load
Angles and Load
Angles and Stress
How do you carry two buckets of water? These illustrations typify the stresses imposed on slings when the legs are attached to the load at various angles.
Load Angle Factor
Sling Angle Load Angle
Degrees(A°) Factor =L/H
90 1.00
60 1.155
50 1.305
45 1.414
30 2.00
LOAD ON EACH LEG OF SLING=
(Load÷2)×LOAD ANGLE FACTOR
ANSI B30.9 recommends against the use of a horizontal sling angle smaller than 30°.
WARNING: Do not use, or allow the use of the products in the catalogue, unless the user has read and understands the applicable instructions and product warnings. Information available upon request.
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