1. PIPE CONSTRUCTION Ohio Department of Transportation
Corrugated Metal Pipe Installation
Brian Flint
Regional Engineer
CONTECH CONSTRUCTION PRODUCTS, INC.

2. What is There to Talk About ?
Materials
Corrugations & Gauges
Coatings
Structural Design
Foundation Considerations
Backfill Procedures
Proper Cover Requirements
CSP Joint Options

3. CONTECH Construction Products, Inc.
80 years of Metal Product Innovation

4. Corrugated Metal Pipe Design Criteria
Hydraulics
Can You Achieve the Flow Requirements
Structural Capacity
Can You Handle the Loading Condition
Durability
Can You Last 75 Years
Prove It !
Economy

5. Structural Design 1. Determine the loads on the pipe.
2. Calculate ring compression.
3. Perform basic strength and stiffness checks.
a) wall strength
b) seam strength
c) handling stiffness
4. Ensure minimum cover.
5. Check and account for corner pressures
on multiple radius pipes. (i.e. pipe arches)

6. Physical Strength Structural Design Installation Stiffness
Importance of a Quality Backfill
Deflection: Modified Iowa Formula
Deflection = Load
Pipe Stiffness + Soil Stiffness
Soil Stiffness Accounts for 90% of Total Stiffness

7. Approved ODOT Sizes CONTECH size range from 6 “ to 144 “. ODOT Sizes:
/4” or 1/2” deep 6” ”
” deep 36” ”
Spiral Rib 18” ”
ALUMINIZED Steel Type 2 Only
and
Fiber Bonded CSP No Longer Available !

8. Durability How Long Should it Last ?
50 years or years
What is the Design Service Life Required ?
ODOT has Durability Charts for Metal Pipe
L & D Manual: and
ALT2 provides a minimum of 75 years for 16ga when 5<pH<9 and R> As the gage is increased, the service life increases.

9. MANUFACTURER
TYPE OF COATING
GAUGE
HEAT NUMBER
DATE OF MANUFACTURE
SPECIFICATIONS

10. Installation Overview
Unloading and Handling
Basic Installation
Bedding
Backfill
ULTRA FLO (Spiral Rib)
Connections/Bands/Accessories

11. Unloading and Handling
Easily shipped in “nested” bundles (fewer trucks)
Easy to handle and unload:
Light weight ( light equipment )
Lifting Lugs for Large Diameter
used with slings and hooks
Slings or fork lift for smaller Diameter
DO NOT Roll off truck
Long Joints ( 20 ft - 40 ft )
Small outside Diameter

12. Proper Bedding Uniform Support Lateral Longitudinal
Well graded granular material
Free of frozen soil, sod, and large rocks
Upper few inches should be relatively loose to allow corrugations to seat in bedding

13. Proper Foundation Uneven Foundation Uniform Foundation Pipe Pipe Soft
Firm
Soft
Pipe
Uneven Foundation
Pipe
Uniform Foundation

14. Soft Foundations Soft Excavate Soft Soil and Replace with
Highly compacted
granular material
Soft In-Situ Soil W D
Soft
Shape Bottom
For Pipe Arch
For pipe-arch, excavate under pipe and replace with
granular material only as deep as is necessary to
obtain stable bed to install pipe

15. Minimum Permissible Spacing For Multiple Installations
Arches
Pipe Arches
Span
Pipe
Diameter
Up to 36”……..12”
36” to 108”……1/3 span
108” to 189”…..36”
Diam.
Up to 24”…..12”
24” to 72”….1/2 diam.
72” and over..36”

16. Backfill Satisfactory material:
Well graded granular, w/ little to no plasticity
Clean/dense/stable/drainable soil
Proper placement (6”- 8” lifts on each side)
Proper Compaction (90% Std. Density)AASHTO T99
Maintain minimum Height of Cover
Installation conditions:
Embankment or Trench

17. Proper Backfill - Embankment
Diameter
8” Lifts
Thoroughly compact fill in 8” max loose lifts. Keep fill at same level on both sides of pipe.
Lifts Should extend at least 1 pipe diameter on each side

18. Proper Backfill - Trench
8” Lifts
Diameter
Outside diameter plus sufficient room
for compaction equipment

19. Tamping Under the Haunches
Span
Diameter
Tampered
Fill
Care must be taken to assure that voids and soft spots
are not left under the haunches of pipe

20. Proper Backfill: Pipe Arches
Span
Compacted Layers
in 8” Lifts
Compacted to max density below
and beside the haunches
Stable

21. Heavy Construction Loads
Finished Grade
Height of Cover
Temporary Cover for
Construction Loads
Pipe

22. Compaction Techniques
Walk Behind Compactor
Sheep Foot or Rubber Tire Roller
Vibrating Rollers
Flooding with Water
approved ODOT methodology

23. Bands and Accessories HUGGER® Band Bolt Bar and Strap Connector
O Ring Gaskets
Flat Band
Flat Gasket
STAB Joint
Fluted Gasket
Dimple Band

24. Your Greatest Strength Can be Your Greatest Weakness
Easy to assemble
Positive Joint, w/ pull apart resistance
Soil tight
Can be done with 1 or 2 people
Small amount of tools
Felton Band Puller
Mallet
Open end or Deep socket wrench
Impact Equipment

25. Band Fasteners Scafco Angle Bar, Bolt and Strap
Used for smaller Diameter Pipe
Bar, Bolt and Strap
Single
Double
Rod and Lug (Levee Band Applications)

26. HUGGER Band 12-1/8” 12-1/8” Connection Detail Single
10-1/4”
H-12
HUGGER
BAND
H-12
HUGGER
BAND
12-1/8”
10-1/4”
O-Ring
Gasket
Gasketed
Section
Connection Detail
Single
Bolt, Bar, & Strap

27. HUGGER Bands Bands are normally furnished as follows:
12” thru 48” 1 piece
54” thru 96” 2 piece
102” thru 144” 3 piece
Band fasteners are attached w/ spot welds
Rerolled ends are 2-2/3” x 1/2” corrugation

28. Longer Lengths = Fewer Joints

29. In Line Fittings: Improved Hydraulics

30. O RING Gaskets: Soil Tight Joints

31. HUGGER Band

32. Band Puller: Helps You Get Started

33. Fabricated Fittings
Full line of fittings including elbows, tees, wyes, risers, bulkheads, reducers, etc.

34. Conclusions Handle it Properly The Right Foundation:
The Key to a Quality Life
Quality Backfill and Placement:
Important for all Systems
Roadway Embankment is Final Objective
HUGGER Bands
Applied Properly
Stab Joints are Coming