What is a slewing mobile crane? - Easy...
Transcript of What is a slewing mobile crane? - Easy...
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What is a slewing mobile crane?A slewing mobile crane is a powered crane which features a boom or jib that can slew from front to back. The crane is mounted on a vehicle. This course does not cover front end loaders, backhoes, excavators or similar equipment.
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Required Knowledge 2.0 -
High Risk Licensing and the Law
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Required Knowledge 2.0 - High Risk Licensing and the Law
Crane and hoist operation:• Tower cranes• Self-erecting tower cranes• Derrick cranes• Portal boom cranes• Bridge and gantry cranes• Vehicle loading cranes• Non-slewing mobile cranes• Slewing mobile cranes• Material hoist• Personnel and materials hoist• Boom-type elevating work platform• Vehicle-mounted concrete placing boom
Forklift operation:• Forklift truck
• Order-picking truck
Pressure equipmentScaffolding workRigging workDogging work
NOTE: Earthmoving equipment is NOT included in the new National Standard.
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Required Knowledge 2.0 - High Risk Licensing and the Law
Required Knowledge 2.0
Question RK 2 (h)You must renew your high risk work licence after how many years?
Answer:5 years.
Don’t forget. Set yourself a reminder before the due date.
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Element 1
Plan Work
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Element 1 - Plan Job
Performance criterion 1.1
Question 1.1 (c)You’ve already planned for site hazards. What other things do you plan for before using the crane?
Answer: Some things to plan for are:
What are some problems or challenges at this site?
How will you get in and out of the site?
Who do you need to talk to?
Where will you use the crane?
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Element 1 - Plan Job
Performance criterion 1.6
Question 1.6 (e)Whenwouldyoucommunicatewiththecraneoperatorusingafixedtwo-wayradio?
Answer:
When the crane operator can’t see you.
If other cranes and doggers are using whistles in the area.
If it’s too noisy to hear whistles.
If you think it’s the best way for the job you are doing.
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Element 2
Conduct Routine Checks
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Element 2 - Conduct Routine Checks
Performance criterion 2.4
Question 2.4 (a)Why is it important to check the crane and equipment before use?
Answer:The crane and equipment must be safe to use. The crane must be right for the job.
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Element 2 - Conduct Routine Checks
Question 2.4 (f) continued
Has been exposed to high heat. For example 280 degrees Celsius.
Cracked or twisted hook
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Element 3
Set Up Crane
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Why you need packingYou must use packing under the outriggers. Each outrigger takes some of the weight of the crane and the load. Packing spreads that weight over a larger area. This makes the crane more stable.
How soil types affect packingThe type of ground you are working on changes how much packing you need. For example, if you need to set up on soft clay you will need more packing than if you are setting up on shale or rock.
If you do not use packing the outriggers could sink and the crane could tip over.
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Element 3 - Prepare Site and Equipment
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Element 3 - Prepare Site and Equipment
Performance criterion 3.7
Question 3.7 (a)You have done your post operational checks. You are about to lift a load. Why should you test your communication equipment?
Answer:To make sure you and the dogger can hear each other.
S A M P L ECan you hear me? Yes.
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Element 4
Transfer Load
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Element 4 - Transfer Load
Performance criterion 4.1
Question 4.1 (d)You are looking at the load chart and working out how much the crane can lift. What do yousubtractfromtheratedcapacity,tofindouthowmuchthecranecanlift?
Answer: Subtract:
Mass of lifting attachments (for example, beams, kibbles)
Mass of hook block Mass of lifting gear (for example, slings).
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Element 4 - Transfer Load
Performance criterion 4.1
Question 4.1 (g)A slewing mobile crane’s boom can slew from front to back. What does slewing like this do to the crane’s capacity?
Answer:The crane’s capacity changes when slewing from front to back. Always check the load chart to make sure the crane will stay within its capacity.
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Load ratings on rubber - KGs
Oper
ating
Ra
dius
(M)
StationaryMobile Over
Front
Front 360O Creep 4KPH
3.00 13,500 8,500 12,000 7,500
3.50 12,000 6,500 10,000 6,500
4.00 10,500 5,000 8,500 5,500
4.50 6,500 4,000 6,000 4,600
5.00 4,500 3,000 5,500 4,000
6.00 3,100 2,200 3,950 3,000
7.00 2,500 1,500 3,000 2,500
8.00 1,900 1,000 2,100 2,000
9.00 1,500 500 1,500 1,500
10.00 1,000 1,200 1,000
12.00 500 100 800
14.00500
With 4.5m ‘A’Frame Jib in stowed or
operating position, powered boom ratings
should be reduced accordingly
Equipped With Jib Stowed Jib Erected
Boom Deduction 180 kilograms 320 kilograms
Hoist reeving
Wire Rope: 13mm Diameter, Minimum Breaking Strength 118KN
Permissible line Loads in KGS
Parts Line1 2 3 4 5 6 7
Main3,000 6,000 9,000 12,000 15,000 18,000 20,000
Load Chart - Up to 20 Tonne (A)ON RUBBER RATINGS NOTES
Crepe is motion for less than 61 metres in a 30 minute
period and not exceeding 1.6KM/H.
INFORMATION
1. Ratings above heavy line are based on structural
limits and not on machine stability. Stationary load
ratings do not exceed 75 per cent of tipping loads.
Mobile load ratings do not exceed 66 per cent of
tipping loads.
WARNINGSWhen transporting a load, the machine must be on
a firm level ground with load centred over the front
and restrained from swinging with mechanical swing
lock engaged.
Load ratings are based on lift limitations and
conditions of tyres inflated to pressures shown and
apply only when axle lockouts are engaged.
Use of jib on rubber ratings is not approved.
Ratings are limited to fully retracted boom.
Load lifted over front or rear and swung over side
with increase in radius due to tyre deflection. The
increase in radius must be compensate for by raising
boom or machine may tip over.
DEFINITIONSOperating radius is the horizontal distance from the axis of
rotation before loading to the centre of the vertical hoist line
or tackle with load applied.
Loaded boom angle is the included angle between the
horizontal and longitudinal axis of the boom base after lifting
rated load at rated radius (see warning notes).
INFORMATION
Crane load ratings are for machines with 1940 kgs of
counterweight and do not exceed 75 per cent of tipping loads
without stowed JIB.
Ratings above heavy line are based on the machine’s hydraulic
or structural competence and not on machine stability.
Weights of hooks, hook block(s), slings and all other load
handling devices shall be considered a part of the load.
Crane load riggings with outriggers are based on outriggers
fully extended set to a distance of 2.5m. From the longitudinal
axis of the carrier to the outrigger float pivot connection with
all load removed from carrier wheels.
WARNINGSFor boom lengths less than 23.6m. With manual section
extended the loads are determined by boom angle only in the
column headed by 23.6m boom.
WARNING: Do not exceed maximum
radius for each column or a tipping
condition will occur.
Reading Load ChartsFor all mobile slewing crane classes
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Using Load ChartsYou are to operate a mobile slewing crane. You will need to work out (calculate) information such as:
To do this you must look at the Load Chart for your crane. There is a lot of information on a Load Chart.WithpracticeyouwilllearnwhichtablestolookatontheLoadCharttofindtheinformationyouneed.YouwillalsogetusedtoreadingtheNotesandDefinitionsontheLoadCharttohelpyouwork out important information.
Maximum load that can be lifted
How many parts of line are needed
The weight of hooks and blocks
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Element 4 - Transfer Load
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360O Load ratings in kilograms with outriggers extended
Oper
ating
Ra
dius
(M) Boom Length
Oper
ating
Ra
dius
(M)
8.5 10 12 14 16 18.2 20.4 23.6
KGs KGs KGs KGs KGs KGs KGs KGs2.50 60 20,900 2.503.00 56 19,800 65 18,300 70 16,800 75 1,350 3.003.50 52 18,300 62 16,800 67 14,500 71 12,500 74 11,500 3.504.00 48 16,800 59 15,300 65 13,500 69 12,100 72 10,500 74 10,500 4.004.50 44 15,300 54 13,800 62 12,200 66 11,200 70 10,000 72 10,200 4.505.00 40 13,800 46 12,300 59 11,000 59 10,300 68 9,000 71 9,500 72 9,500 5.006.00 25 12,300 38 11,200 53 9,400 53 9,400 64 6,500 67 8,500 69 8,200 6.007.00 30 10,100 45 6,300 48 6,500 58 5,200 62 6,300 65 6,500 70 5,450 7.008.00 18 9,000 38 5,100 42 4,500 50 4,000 58 5,200 62 5,200 69 5,000 8.009.00 29 4,000 34 3,000 44 3,500 54 4,000 58 4,000 68 4,500 9.00
10.00 32 2,500 50 3,500 46 3,500 64 4,000 10.0012.00 41 2,500 36 2,500 60 2,500 12.00
Step 1: Find the 14 metre boom length column on the table. The boom lengths are labelled across the top of each column.
Step 2: Find the 5 metre
operating radius. The operating
radius in metres is shown in the
left column. Follow down the rows until you findthe5metre
radius.
Step 3: Follow the 5 metre radius
row along until you meet the 14
metre boom length column. That is the
load rating that you are looking for.
Answer 4.1 (i): 10,300 kg
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Element 4 - Transfer Load
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Element 5
Mobile Load
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Element 5 - Mobile Load
Performance criterion 5.1
Question 5.1 (a)Whyisitbesttomobile(drive)thecraneonfirmandlevelsurfaces?
Answer: To help keep the crane stable and stop load swing.
Keeponfirmlevelsurface
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Element 5 - Mobile Load
Question 5.3 (b) continued
Move slowly.
Keep the load as low as you can.
Keep the radius and boom angle small.
Be careful of load swing.S A M P L E
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Element 6
Shut Downand Secure Crane
ON
OFF
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Element 6 - Shut Down and Secure Crane
Performance criterion 6.1
Question 6.1 (a)Is it OK to leave a load hanging from the hook after you’ve shut down the crane?
Answer: No. The winch or boom could creep (the load might drop down slowly). The boom may slew.
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Element 6 - Shut Down and Secure Crane
Question 6.6 (a) continued
Check the tyres are pumped up and not damaged
Check that the hook is secure
Checkforfluidleaks (oil,water,fuel,hydraulicfluid)
Make sure outriggers are retracted.S A M P L E