OSHA: Commercial Scaffolds. Flashcards
(52 cards)
0
Q
- How do we know a scaffold is square?
A
Horizontal and vertical members form right angles where they connect.
1
Q
- A supported scaffold must have these features?
A
- Safe foundation.
- Plumb, level, square.
- Braced and solidly connected.
- Safe access.
- Safe platform.
- Guardrails: toprails, midrrails, toeboards.
2
Q
- What is a brace?
A
A brace holds one scaffold member in a fixed position in relation to another. Bracing works horizontally or diagonally to reduce movement.
3
Q
- Types of scaffold braces?
A
- Cross brace - diagonal in vertical plane.
2. Diagonal brace - in horizontal plane.
4
Q
- When does OSHA requires braces on scaffolds?
A
On all supported scaffolds.
5
Q
- What is a tie-in in scaffolding?
A
The anchor bolt tie-in is a common tie-in that support scaffold to a nearly permanent structure. It consist of a steel plate welded to a tie -in tube and drilled to receive the
Anchor bolt. The anchor bolt must be the uniformly expanding type to prevent loosening due to the longitudinal vibration of the scaffold.
6
Q
- What are the requirements for a suspension scaffold?
A
- Be solidly attached to the structure it hangs from.
- Have all its parts in good repair.
- Have guardrails - toprails, midrails, mesh, and toeboards.
- Have a platform at least 20” wide, but no wider than 36.
- Be evaluated by a competent person before use.
- Have its wire ropes inspected daily by a competent person.
7
Q
- How are suspension scaffolds hung?
A
- An outrigger beam with counterweights.
- A rolling outrigger beam with counterweights.
- Roof hooks.
- Parapet clamps.
8
Q
- What does a suspension scaffold hung require?
A
Tiebacks - rod or rope - which act as secondary anchorage points to prevent movement in the scaffold.
9
Q
- What must suspension scaffold hung devises be capable of support?
A
At least 4 times the load imposed on them by the scaffold operating at the rated load of the hoist or at least 1.5 times the load imposed by the scaffold at the stall capacity of the hoist, whichever is greater.
10
Q
- How must counterweights be made?
A
Not of sand, liquid, or building materials.
11
Q
- How must roof hooks of suspension scaffold be?
A
Mild steel of proper design.
12
Q
- How must tiebacks of suspension scaffold be?
A
3/4” manila rope, or equivalent. Tieback must be installed at right angles to the face on a structurally sound structure.
13
Q
- What are suspension scaffolds suspended by?
A
Wire, synthetic, or fiber rope.
14
Q
- Ho must the suspension scaffold rope be?
A
They must be able to support 6 times the intended load. They must be free of corrosion and chemical damage. They must not be frayed, kinked, or have broken wires.
15
Q
- How must all other than the ropes scaffolds parts support the intended load?
A
4 times the maximum intended load.
16
Q
- How must suspension scaffolds be inspected?
A
By competent person before installation and during use.
17
Q
- What is the difference in fall protection requirements in suspension scaffolds?
A
- The height of the guardrail can range from 36” to 42”.
- Workers must also wear personal fall protection. The lifeline must be securely attached to substantial members of the structure.
18
Q
- What are the platform requirements for suspension scaffolds?
A
- They must be between 20” and 36” wide overall.
- They can be one of four types:
A. Plank-type,
B. beam-type.
C. Light metal type.
D. Ladder-type, which is rarely used.
19
Q
- What is the maximum intended load for scaffold?
A
It is the heaviest load the scaffold is designed to carry. It is the scaffold’s live load - all workers, tools, and materials.
20
Q
- What is the scaffold’s dead load?
A
The weight of all the scaffold parts - uprights, braces, guardrails, toeboards, ladders, planks, and accessories.
21
Q
- How can we protect ourselves when working on scaffolds?
A
- Do not allow tools, materials, or debris to collect on the scaffold.
- Never, never throw or drop tools, materials, or equipment.
- Make sure all connections are in place and completely tight.
- Do not stand on ties.
- Do not stand on guardrails or plank extensions.
- Do not overreach outside of the guardrails.
- Stay off scaffold during loading or unloading.
- Replace guardrails after loading or unloading.
- Use 3-point climbing.
- Don’t hang tarps without evaluation.
- Get off mobile scaffold before it’s moved.
- Never leave partially dismantled scaffolds unguarded or unlabeled.
- Wear the right clothing and safety gear.
22
Q
- What are osha’s scaffold safety training requirements?
A
The training must include:
- Any electrical hazards.
- Fall hazards.
- Falling objects.
- Fall protection and falling object protection.
- Proper use of scaffold.
- Proper handling of materials.
- Maximum intended load and capacity of scaffolds used.
23
Q
- The three main types of scaffolds are:
A. Needle beam, suspension, aerial lifts.
B. supported, suspension, aerial lifts.
C. Suspension, aerial lifts, frame.
D. Aerial lifts, suspension, needle beams.
A
B. supported, suspension, aerial lifts.
24
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25. The OSHA standards for scaffolding are found in:
A. Subpart L.
B. subpart X.
C. Subpart M.
D. Subpart H.
```
A. Subpart L.
25
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26. Most scaffolds use what kind of construction?
A. Post and joist.
B. needle beam and pole.
C. Cross beam.
D. Beam and post.
```
D. Beam and post.
26
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27. The most frequent and serious danger of working on a scaffold is:
A. Falling objects.
B. bad weather conditions.
C. Falling of the scaffold.
D. Electrocution.?
```
C. Falling off the scaffold.
27
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28. How many workers are injured in scaffold falls each year?
A. About 250 workers.
B. about 6000.
C. About 14000.
D. About 29000.?
```
D. About 29000,
28
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29. The employer assigns a _ to make sure the scaffold remains in safe working condition:
A. Shop steward.
B. scaffold erector.
C. Competent person.
D. Manufacturer's representative.?
```
C. Competent person.
29
30. How do scaffold legs attach to mudsills?
A. Base plates or tie-ins.
B. base plates or base plates with screw jacks.
C. Screw jacks or tie-ins.
D. Base plates or braces with screw jacks.
B. base plates or base plates with screw jacks.
30
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31. Plumb, level, and square refer to the scaffold's:
A. Length.
B. the tiers and tubing.
C. Tubular couplings and frames.
D. Horizontal and vertical alignment.
```
D. Horizontal and vertical alignment.
31
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32. How should base plates be positioned on sills?
A. Centered and nailed.
B. centered and glued.
C. 2" from end and nailed.
D. 2" from end and glued.
```
A. Centered and nailed.
32
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33. Substitution of another manufacturer's parts in a scaffold can be approved only by the:
A. Manufacturer's representative.
B. competent person.
C. OSHA representative.
D. State labor department official.
```
A. Manufacturer's representative.
33
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34. The ideal height for a guardrail is:
A. 38".
B. 36".
C. 46".
D. 52".
```
A. 38".
34
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35. Guardrails should be _ lumber or material giving equivalent protection.
A. 1x2-inch.
B. 2x10-inch.
C. 1x10-inch.
D. 2x4-inch.
```
D. 2x4-inch.
35
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36. Toprails on supported scaffolds must be capable of withstanding a force of _ ?
A. 100 pounds.
B. 200 pounds.
C. 300 pounds.
D. 400 pounds.
```
B. 200 pounds.
36
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37. What is the minimum height of a toeboard?
A. At least 1-1/2".
B. at least 2-1/2".
C. At least 3-1/2"
D. At least 4-1/2 ".
```
C. At least 3-1/2".
37
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38. When work platforms are more than _ above or below a point of access, then stairways, ladders, or personal hoists must be used.
A. 6".
B. 12".
C. 2'.
D. 3'.?
```
C. 2'.
38
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39. For work platforms less than 10', planks should extend over the supports at least _ , but not more than _ .
A. 6", 12".
B. 12", 18".
C 14", 18".
D. 18", 24".
```
A. 6", 12".
39
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40. You can recognize scaffold-grade lumber because it has:
A. Fine grain and a smooth surface.
B. a stamp of approval.
C. Fewer than 4 knots per board foot.
D. A slightly concave appearance.?
```
B. a stamp of approval.
40
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41. When planks overlap, they must meet at the uprights and overlap each other by at least _ inches or be secured in place.
A. 6".
B. 8".
C. 12".
D. 14".
```
C. 12".
41
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42. How much weight must the suspension cables on a suspension scaffold be able to support?
A. At least twice the intended load.
B. at least 3 times the intended load.
C. At least 4 times the intended load.
D. At least 6 times the intended load.?
```
D. At least 6 times the intended load.
42
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43. How wide must a suspension scaffold platform be ?
A. 20 to 36".
B. 15 to 30".
C. 10 to 24".
D. 20 to 25".?
```
A 20 to 24".
43
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44. Which of the following is not a proper way to hang a suspension scaffold?
A. Outrigger beam with counterweights.
B. roof hooks.
C. Parapet clamps.
D. Ledge clamps.
```
D. Ledge clamps.
44
45. Workers on suspension scaffolds must wear personal fall protection:
A. At all times.
B. only above water.
C. Only at 6' or above.
D. Only when guardrails are not in place.
A. At all times.
45
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46. Workers in aerial lifts must wear body harnesses and lanyards tied off to:
A. A permanent structural member.
B. the boom or basket.
C. The truck bed.
D. A solid member external to the lift.?
```
B. the boom or basket.
46
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47. How often must a competent person test the controls of an aerial lift to assure they are in safe working condition?
A. Before every lift.
B. before and after each shift.
C. Once each day after use.
D. Once each day prior to use.?
```
D. Once each day prior to use.
47
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48. OSHA requires that most scaffolds be designed to support _ their maximum intended load.
A. 20 times.
B. 8 times.
C. 6 times.
D. 4 times.?
```
D. 4 times.
48
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49. If you must point load a scaffold platform, where should you place the loads?
A. Above the supports.
B. above the putlogs.
C. Above the tie-ins.
D. Outside the guardrails.?
```
A. Above the supports.
49
50. If you leave a scaffold partially dissembled, you must:
A. Inform OSHA of its location.
B. warn potential users with clearly marked tags.
C. Inform your job steward of its condition.
D. Keep a record of the parts you have removed.?
B. warn potential users with clearly marked tags.
50
51. You may stand on the guardrail of a supported scaffold:
A. When you are tied off to the vertical support.
B. if you are tied to the structure.
C. As long as you are careful.
D. Under no circumstance.
D. Under no circumstance.
51
52. According to OSHA, you now have all the training you need to work safely on scaffolds.
A. True.
B. false.
B. false.
