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Construction safety > week 10 rigging > Flashcards

week 10 rigging Flashcards

1
Q

Between the trolley hook and the load is____.

A

rigging

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2
Q

1926.251 General

A

 Rigging inspected prior to shift(s)  As necessary during use  Removed if defective  Remove rigging equipment when not in use

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3
Q

Alloy Steel Chain rules

A

1.Size, 2.Grade 3.Rate d capacity 5. Sling manufacturer. All attachments capacity at least equal to chain.

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4
Q

hoist chains

A

Check for wear, gouges, stretch, shearing. Inspection is LINK by LINK, Twisted link extremely unsafe. Use with grab hooks. Tags: should be on every chain: Size, Grade, Capacity.

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5
Q

Four grades of hoist chains

A

Grade 28 General Utility Chain ◦
Grade 43 High Test Chain ◦
Grade 70 Binding Chain ◦
Grade 80 Alloy Steel Chain: The only one used for overhead lifting!

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6
Q

Job or shop hooks and links, or makeshift fasteners, formed from bolts, rods, etc., or other such attachments_______.

A

shall not be used

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7
Q

CP inspections made & based on:

A

◦ (A) Frequency of sling use; ◦ (B) Severity of service conditions; ◦ (C) Nature of lifts being made; and ◦ (D) Experience gained on the service life of slings used in similar circumstances.

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8
Q

CP inspections should be done at least once a year _______.

A

Documented and available

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9
Q

Follow manufacturers safe working load recommendations, or Tables H - 3 through H - 14. No knots in ____ except where permitted

A

wire rope

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10
Q

Rope core could be made of_____.

A

Fiber, IWRC, strand

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11
Q

6X25 FW PRF RLL XIP IWRC. This translates to:

A

A 6 strand (6X25) of filler wire construction (FW). The grade of wire used is Extra Improved Plow Steel (XIP).

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12
Q

The strands are preformed _____ in helical pattern before being laid ______ around an ________.

A
  1. (PFR)
  2. Rigt Land (RLL)
  3. Independent wire rope core (IWRC)
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13
Q

A mechanical splice cannot have a _____, it must be done in a shop.

A

pigtail

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14
Q

Wire rope shall not be used if, _________.

A

in any length of eight diameters, the total number of visible broken wires exceeds 10 percent of the total number of wires, or if the rope shows other signs of excessive wear, corrosion, or defect.

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15
Q

U-bolt applied so that the “U” section is in contact with the _____.

A

dead end of the rope

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16
Q

Use Table H - 20 to determine number and ____ of clips

A

spacing

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17
Q

______shorten slings with knots or bolts

A

Never

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18
Q

Protect slings from ______.

A

sharp edges

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19
Q

Never apply a shock load when ____.

A

lifting

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20
Q

Never place finger between sling & load when ____.

A

tightening

21
Q

 Tables H - 15 through H - 18 apply  Knots not used instead of splices  Remove from service if:

A

◦ Abnormal wear. ◦ Powdered fiber between strands. ◦ Broken or cut fibers. ◦ Discoloration or rotting.

22
Q

(1)Each synthetic web sling marked or coded to show:

A

◦ (i) Name or trademark of manufacturer. ◦ (ii) Rated capacities for the type of hitch. ◦ (iii) Type of material.

23
Q

Synthetic webbing

A

(nylon, polyester, and polypropylene)

24
Q

Don’t use ___ around synthetic webbing.

A

acids or phenolics because, Acid or caustic burns ◦ Melting or charring of any part of the sling surface; ◦ Snags, punctures, tears or cuts; ◦ Broken or worn stitches; or ◦ Distortion of fittings.

25
Q

When dealing with shackles and hooks use table h-19 and Use manufacturers recommendations. Tested to ____ the intended safe working load before they are initially put into use. Maintain a record of the ____ and results of such tests.

A

twice, dates

26
Q
  1. Know the weight of the load 2. Know the center of gravity of the load. 3. Make load attachment above the center of gravity of the load. 4. Select hitch that will hold and control. 5. Know the rated capacity of slings and hardware 6. Select sling best suited for load. 7. Inspect all rigging before the lift. 8. Protect sling from sharp surfaces. 9. Proper calculation of increased tension caused by sling angles (on all rigging components!). 10. Calculate reductions when using choker hitch.11. Keep personnel clear from lift area. 12. Lift load a few inches then check rigging. 13. Know limitations of all lifting devices used. 14. Lift slowly and stop slowly.
A

rules for rigging ssafety

27
Q

to which load or force is applied to the base (bowl saddle)

A

Sling Hooks

28
Q

contain a throat or slot of uniform width for securing on the link of a chain, usually to form a chain loop for securing the load

A

Grab hooks

29
Q

 Do not ____ the working load limits.

A

exceed

30
Q

Only use alloy heat treated hooks for ____ lifting

A

over-head

31
Q

Do not tip load or use the hook in any manner for which it was not intended. Do not ___ load or dynamic load.

A

shock

32
Q

Never apply load to hook ___, ___ are only to retain slack chains and sling

A

latches

33
Q

What should you look for when inspecting hooks?

A

 Wear  Deformation  Cracks  Sharp Nicks

34
Q

hook/load angles

A 
A. Balanced 100% 
B. 1/4 off center 86% 
C. 1/2 off center 80% 
D. 3/4 off center 70% 
E. Point loading 40%
35
Q

balanced

A

100%

36
Q

1/4 off center

A

86%

37
Q

1/2 off center

A

80%

38
Q

3/4 off center

A

70%

39
Q

point loading

A

40%

40
Q

Whenever wear at any point of any chain link exceeds that shown in ___, the assembly shall be removed from service.

A

table H-2

41
Q

Link by link inspection is facilitated by ____ the chain

A

collapsing

42
Q

Wear occurs in areas of high rubbing:

A
  1. The bearing points of interlink contact.

2. Outside of straight side barrels.

43
Q

Wire rope wear is based on:

A
  1. Loading 2. Bending (# of times) 3. # of use cycles Change in rope diameter is criteria for retirement. The area in a wire rope to check wear is where it travels over the block in the section from picking a load to lifting it. Wires need lubrication to prevent corrosion. Apply by spray, brush or dip. Wire tends to wear flat on outer strands, especially where it travels over drums & sheaves.
44
Q

How to check for wear in clevis

A

•In the bowl of the saddle •Check the pin for: •Straightness •Wear Check for distortion in the: •Open end of the ‘U’

45
Q

Spreader beams can be used with a double vertical hitch to handle long loads ____.

A

Reduces tipping

46
Q

what is the load equation?

see note for example problems.

A

(Load / Number of legs) X (L / H) = Load each sling leg

47
Q

A load is stable when:

A

The hook is directly above the center of gravity of the load.

48
Q

Estimate the center of gravity

A

Lift the load just enough to clear the ground. If the hook is not over the center of gravity the hook will travel to the center of gravity

49
Q

If the load tips more than ___, the rigging should be adjusted

A

3 degrees

Construction safety (24 decks)

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