Unit 6. Rigging
(Instructions)
Guide to Rigging Inspection
To prevent personal injury or damage to the load, it is important to inspect all rigging. This should be done before attaching it to a crane. Different kinds of slings are subject to different kinds of damage. You should inspect the lay of a wire rope for damage. All ropes will break from fatigue over time. Other damage is caused by improper handling. Heavy loads cause strand nicking and individual wire breaks. A sudden release of tension can result in a birdcage of separated wires. If a loop in a slack line is pulled down, the rope could get a kink. A charred web sling has been exposed to high temperatures and weakened. Cuts or snags are also common. Knots also greatly reduce a sling’s strength. They should be removed if possible. Chain slings are very strong. However, they are still subject to damage from heavy loading or incorrect use. Links can be stretched, bent, or gouged. 1. Before you read the passage, talk about these questions. 1. What are some different kinds of crane rigging? 2. What are some problems that can affect crane rigging? Reading
2. Read the instructions for inspecting rigging. Then, mark the statements as true (T) or false (F).
1. What causes a birdcage in a wire rope? A normal fatigue B excessive heat C a release of tension D a pulled loop in a slack line 2. Which of the following is NOT a concern for web slings? A cuts C burns B knots D bent links 3. What kind of damage can occur to chain slings? A kinks C gouged links B snags D strand nicking Vocabulary
3. Match the words (1-7) with the definitions (A-G). 1 __ fatigue 5 __ birdcage 2 __ kink 6 __ knot 3 __ web sling 7 __ lay 4 __ rigging A the use of slings, ropes, and other equipment to move heavy objects with a crane B a device made of nylon or polyester often used to lift objects in place of a wire rope C a permanent distortion of wire strands caused when a loop in a slack rope is pulled down D a looping of string or wire that cannot easily be untangled E wear on a piece of equipment due to repeated use F a length of rope equal to one spiral of a strand around the core
G a permanent separation of wire strands due to a sudden release of tension
4. Read the sentence pair. Choose where the words best fit the blanks. 1. wire rope / sling A This _________ has a kink and must be replaced. B What kind of_________ should be used for this rigging? 2. strand nicking / charred A This web sling was________by the fire. B ________happens when strands rub against each other. 3. chain sling / link A She will need a_______to lift this heavy load. B Be sure to inspect each_______for gouging.
5. Listen and read the instructions for inspecting rigging again. What kinds of damage should you look for in a web sling?
Listening
6. Listen to a conversation between a construction worker and a manager. Mark the following statements as true (T) or false (F).
1 __ The web sling can be repaired.
2 __ The man needs to lift an air conditioner.
3 __ The woman recommends using a wire rope.
7. Listen again and complete the conversation.
Worker: I have a web sling here that is 1______________________.
Manager: Really? 2__________ __________ with it?
Worker: I don’t know how it happened. It has a pretty bad cut. It’s definitely 3_______ ______ _______ ________.
Manager: I see. I’m glad you spotted that. Do you have 4______ ______ you could use?
Worker: There are a 5_______ _______ _______. I could go get a new web sling. Or, I could use a wire rope to lift the load instead.
Manager: Hmm. What is the load?
Worker: It’s an air conditioning unit. It’s going 6_______ _______ _______ of the house.
Manager: In that case, you’d better go get another web sling. We wouldn’t want a wire rope to damage the unit.
Worker: Sure thing. I’ll be right back.
Speaking
8. With a partner, act out the roles below based on Task 7. Then, switch roles.
USE LANGUAGE SUCH AS:
I have a…
What’s wrong…
I could…
Student A: You are a construction worker. Talk to Student B about:
- a problem with a sling
- options to replace the sling
- the right option to use
Student B: You are a manager. Talk to Student A about a problem with a sling.
Writing
9. Use the instructions and the conversation from Task 8 to fill out the sling inspection report. Sling Inspection Report Problem:______________________________ Options:_______________________________ Recommendation:_______________________
Приложение: