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Compaction Strand Wire Rope Construction (35(W)×K7)

  • DAWSON/OEM
  • 14-60mm
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Compaction Strand Wire Rope Construction (35(W)×K7)
- Dawson Group Ltd. - China Manufacturer, Supplier, Factory

Compaction Strand Wire Rope Construction (35(W)×K7) - Dawson Group Ltd. - China Manufacturer, Supplier, Factory
Diameter of
steel wire
(mm)
Reference weight
(kg/100mm)
Grade of nominal strength (MPA)
1570 1670 1770 1870 1960
Minimum Breaking Load of Rope(KN) Min B/L
14 100 126 134 142 150 158
16 131 165 175 186 196 206
18 165 209 222 235 248 260
20 204 257 274 290 307 321
22 247 312 331 351 371 389
24 294 371 394 418 442 463
26 345 435 463 491 518 543
28 400 505 537 569 601 630
30 459 579 616 653 690 723
32 522 659 701 743 785 823
34 590 744 792 839 886 929
36 661 834 887 941 994 1040
38 736 930 989 1050 1110 1160
40 816 1030 1100 1160 1230 1290
42 900 1140 1210 1280 1359 1420
44 987 1250 1330 1400 1480 1560
46 1080 1360 1450 1540 1620 1700
48 1180 1480 1580 1670 1770 1850
50 1280 1610 1710 1810 1920 2010
52 1380 1740 1850 1960 2070 2170
54 1490 1880 2000 2120 2240 2340
56 1600 2020 2150 2280 2400 2520
58 1720 2170 2300 2440 2580 2700
60 1840 2320 2460 2610 2760 2890

Note:the minimum aggregate breaking force = minimum breaking load ×1.287.

Application of Compaction Strand Wire Rope Construction (35(W)×K7) - Dawson Group Ltd. - China Manufacturer, Supplier, Factory
Wire Rope Sling Application
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.
Hitches - Dawson Group Ltd. - China Manufacturer, Supplier, Factory, Exporter
 
   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

Hitches - Dawson Group Ltd. - China Manufacturer, Supplier, Factory, Exporter
 
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

Basket Hitch - Dawson Group Ltd. - China Manufacturer, Supplier, Factory, Exporter
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.

Reeving - Dawson Group Ltd. - China Manufacturer, Supplier, Factory, Exporter
 
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.
Triple and Quad Leg Slings - Dawson Group Ltd. - China Manufacturer, Supplier, Factory, Exporter
Center of Gravity(COG)
The location of the center of gravity to the pick points is an important consideration.

Center of Gravity(COG) - Dawson Group Ltd. - China Manufacturer, Supplier, Factory, Exporter
 
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

COG and Sling Loading - Dawson Group Ltd. - China Manufacturer, Supplier, Factory, Exporter
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 - Dawson Group Ltd. - China Manufacturer, Supplier, Factory, Exporter Sling Angle - Dawson Group Ltd. - China Manufacturer, Supplier, Factory, Exporter
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.
Sling Angles - Dawson Group Ltd. - China Manufacturer, Supplier, Factory, Exporter
             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°.
Sling Angles - Dawson Group Ltd. - China Manufacturer, Supplier, Factory, Exporter       Sling Angles - Dawson Group Ltd. - China Manufacturer, Supplier, Factory, Exporter
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.
Other related products:

Factory of Compaction Strand Wire Rope Construction (35(W)×K7) - Dawson Group Ltd. - China Manufacturer, Supplier, Factory
Package of Compaction Strand Wire Rope Construction (35(W)×K7) - Dawson Group Ltd. - China Manufacturer, Supplier, Factory

 

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