Best Practices for Material Transfer Operations

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Best Practices for Material Transfer Operations
1
Best Practices for Material
Transfer Operations
WINDROW PAVING OPERATIONS
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Principles and Techniques 2
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Quality
Production
Material Management
Machine Setup
Paving Tips
Machine Features
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Quality 3
• Pavement smoothness
• Material consistency
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Pavement Smoothness 4
• Uniform, uninterrupted
flow of material
• Constant head of
material
• Constant paving speed
• Set feeder system at a
constant rate
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Material Consistency 5
• Remixing occurs when
augers bring material in
to the conveyor
• Remixing occurs when
material is conveyed to
the hopper
• Remixing discharge
hopper
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Production 6
• Match paving rate to
plant output
• Improves trucking
efficiency
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Production – Lower Haul Costs 7
• When using a 20-ton
truck and the paving rate
is 300 tons/hr
• Windrow takes 30
seconds to lay
• End dump takes 3-4
minutes to empty
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Production – Improved Trucking Efficiency 8
• Truck interchange
inefficiencies can be
eliminated
• Decreases truck
grouping
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Low Wheel Loads 9
• Wheel loads do not
exceed agency
guidelines
• Low ground contact
pressure
• Smaller physical
dimensions than MTV
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Material Management 10
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Project Planning
Windrow Placement
Paver Speed
Trump Dump Intervals
Dynamics of a Windrow
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Project Planning 11
• Roadway is used as
surge device
• Material placement and
windrow size are
important
• Windrow size must
mirror paving conditions
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Windrow Placement 12
• Combining augers allow
use of various types of
windrow placement
• Belly Dumps
• Live Bottom
• End Dumps
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Truck Dump Intervals 13
Dump Zone
• Calculate the distance
ahead of the paver
based on mat width and
depth
• Establish dump zone
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Dynamics of a Windrow 14
• Field measurements
show temperature loss
is minimal
• Only surface cooling
takes place
• Internal temp remains
constant
• Combing augers remix
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Windrow Paving Operations 15
• Machine Setup
• Paving Tips
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Paver/Elevator Attachment 16
• Place on level surface
• Attach mounting bracket
to paver
• Raise or lower elevator
so mounting bracket and
paver match
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Scraper Adjustment 17
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2
• Scrapers adjust with a
ratchet (1)
• Center scraper height
adjusts with leg
cylinders (2)
• Adjust center scraper if
center streaks occur
behind mat
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Paving Tips – Hopper Capacity and Speed 18
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Adjust truck dumping to
match paving speed
Never get more than 2 truck
loads ahead
Use second truck to dump
on existing windrow if
hopper is low
Leave gaps if hopper is full
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Paving Tips – Windrow Placement 19
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Windrow should be
centered
Due to wide width, windrow
can be off-centered to meet
operating conditions
If angle of grade fills hopper
uneven, move windrow to
opposite side
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Paving Tips – Moving into the Windrow 20
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Adjust legs to pick up
material from surface
Adjust outside scrapers to
pick up material behind
augers
Pick up enough material to
fill hopper
Back up paver, set up
screed and start paving
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Paving Tips – Trucking 21
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Closely monitor dumping
procedures or have loader
on site until crew becomes
proficient with placement
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Machine Features 22
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Three-point suspension
Material feed system
Material conveyor system
Dual operator stations
Adjustable scrapers
Remixing discharge hopper
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
Summary – Windrow Paving Advantages 23
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Uniform flow of material
Minimal thermal
segregation
Trucking efficiencies
Lower machine operating
costs
Low ground pressure
Simple machine transport
March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com
4
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March 22-24, 2016 | Nashville, TN | www.worldofasphalt.com

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