andrea hendrickson mndot state hydraulic engineer of...andrea hendrickson mndot state hydraulic...
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![Page 1: Andrea Hendrickson MnDOT State Hydraulic Engineer of...Andrea Hendrickson MnDOT State Hydraulic Engineer Maintenance crews cleaned, repaired and replaced culverts Record labor, equipment](https://reader035.vdocuments.mx/reader035/viewer/2022062402/5f0411b27e708231d40c2a76/html5/thumbnails/1.jpg)
Andrea HendricksonMnDOT State Hydraulic Engineer
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Maintenance crews ◦ cleaned, ◦ repaired and◦ replaced culverts
Record ◦ labor, ◦ equipment and◦ materials
Using mobile iPad app or a PC web app.
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System planning (funding needs)
Maintenance project planning (labor, equipment, materials needs)
Identify: ◦ most cost effective
culvert repairs ◦ cost savings
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Maintenance Culvert Repair Costs Recorded Onsite using Arc GIS Mobile App
Rapid App Development took 3-4 months!
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Map of Repairs by MnDOT
Maintenance In 2014 & 2015
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Type of Repair Completed 2014
Completed 2015
Total Both Years
% of Total Repairs
Trench New Pipe 149 165 314 57%Slipline Pipe 9 38 47 9%Reset Apron and Pipe 41 25 66 12%Replace Apron and Pipe 11 41 52 9%Joint Repair 17 16 33 6%Pipe Extension 4 11 15 3%Fix Pipe Hole 2 2 4 1%Fill Void 1 5 6 1%Other Repair 5 8 13 2%Total Repairs 239 311 550
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108 Beaver16%
426 Culvert cleaning
65%
59 Ditch
cleaning9%
67 Ice removal
10%
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3% 3%14%
13%67%
Culvert Condition Before Repair
0 - Unknown
1 - Like New
2 - Fair
3 - Poor
4 - Very Poor
1%
71%23%
4%
1%
Culvert Condition After Repair
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Culvert data Labor Equipment Materials
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Average Estimated Maintenance Cost of Culvert Repair
Repair CategoryCulvert
CategoriesNumber of
RepairsAverage Repair
CostTrench New Pipe All 314 $ 8,430
Highway 1 $32,170Side 2 $ 9,610Entrance 3 $ 5,160
Slipline 47 $12,570Reset Apron and Pipe 66 $ 3,000 Replace Apron and Pipe 52 $ 3,000Joint Repair 33 $ 2,710Pipe Extension 15 $ 4,060 Hole Repair 4 $ 2,000Fill Void 6 $ 1,020Other 13 $11,270All Culvert Repairs 550
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$-
$2,000
$4,000
$6,000
$8,000
$10,000
$12,000
$14,000Material Cost Equipment Cost Labor Cost
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$-
$2,000
$4,000
$6,000
$8,000
$10,000
$12,000
$14,000Material Cost Equipment Cost Labor Cost
Paved Inverts Internal Bands Reset Aprons
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Material TypeTotal Cost of a
24” Apron or Pipe
Average % of Material Cost
(based on 2014 data)Metal flared apron $113/each galvanized
$249/each aluminized17%
Metal safety apron $580/each galvanized $880/each aluminized
50%
L
E
M
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Material TypeTotal Cost of a
24” Apron or Pipe
Average % of Material Cost
(based on 2014 data)Corrugated steel pipe $17/L.F. 48%
Aluminized steel pipe $19/L.F. 30%
HDPE pipe $22/L.F. 58%Polypropylene $24/L.F. 42%Concrete Pipe $30/L.F. None
Average Material Cost 30% of Total Cost L
E
M
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$0
$10,000
$20,000
$30,000
$40,000
$50,000
$60,000
0 50 100 150
Tota
l 201
5 Ad
just
ed C
ost
Culvert Length
Entrances Side Culverts Highway
Budget Busters
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Repair Category Number of Repairs Used Highway
Average Trench New Highway Pipe 314 $32,170
Hwy with Standard Trench Width 19 $26,026
Hwy with Wider Tapered Trench(has 10:1 side slopes)
10 $43,832
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Repair Category Number of Repairs Used Highway
Average Trench New Highway Pipe 314 $32,170
Hwy with Standard Trench Width 19 $26,026
Hwy with Wider Tapered Trench(has 10:1 side slopes)
10 $43,832
Repair Category Number of Repairs Used Highway
Slipline Need to make sure pipe has adequate hydraulic capacity to reduce size by lining
47 $12,650
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16 gage Galvanized 16 gage Aluminized
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Aluminized Steel14%
CSP63%
HDPE22%
PP1%
Installed in 2014
Aluminized Steel14%
CSP37%
Polymeric Coated CSP
4%
Concrete2%
HDPE40%
PP2%
Other Pipe1%
Installed in 2015
No such thing as a perfect pipe, pick the best for the site conditions.
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Culverts installed by maintenance in 2014 & 2015
Material type◦ Red – Galvanized CSP◦ Blue – Aluminized CSP◦ Green - HDPE ◦ Yellow – Polymeric coated CSP
Red area galvanized lasts <25 year
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Trench new pipe, catch basin repair, cleaning, reset aprons & pipe extensions are labor intensive repairs.
Traffic control increases costs Scheduling matters (i.e. travel distance
increases hours, size of crew, waiting for…) Don’t jump to conclusions◦ Complex or large projects higher labor or needs
supervisor on site.
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Specialty Equipment ◦ Size and type to do the job i.e. grout pump or jetter◦ Own vs. rent
What size dump truck? ◦ Distance matters◦ Charge rates by hour or per mile
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Use most cost effective pipe repair considering all components of cost, i.e. equipment and labor costs, not just material cost
Look for ways to improve culvert repairs, ◦ cost drivers and ◦ budget busters
Cheapest material might not be the best choice◦ Most cost effective over the life of the culvert
http://www.dot.state.mn.us/bridge/hydraulics/CulvertCost.html
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