Snap-Tite Culvert Rehab · 7/15/2019 · “N” factor of Snap-Tite HDPE Pipe is .00914. Summary...
Transcript of Snap-Tite Culvert Rehab · 7/15/2019 · “N” factor of Snap-Tite HDPE Pipe is .00914. Summary...
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Snap-Tite
Culvert Rehab
DOT & PF Quarterly Design Meeting
Mark Kleven
Northwest Regional Sales Manager
Snap-Tite
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Product DataCross Section
● Typical Cross Section of Snap-Tite HDPE Pipe
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Product DataDesign Life
● Snap-Tite HDPE Pipe has a design life of 100 years as
designated by the Plastic Pipe Institute.
– www.plasticpipe.org
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Product DataHydraulic Characteristics
● The Snap-Tite joint allows sections of pipe to be joined
mechanically in the field without increasing the OD or
decreasing the ID of the liner at the joint
● The smoothness of the surface of HDPE pipe actually
increases flow rates, despite reducing the size of the
culvert
● Snap-Tite has a Manning “n” factor of 0.00914, whereas
CMP has an “n” factor of 0.024.
– This allows Snap-Tite to be sliplined inside a failing CMP and in
most cases, increase the flow of water in that culvert.
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Product DataCorrosion / Abrasion
● Corrosion
– Snap-Tite HDPE Pipe is corrosion resistant which makes it ideal for drainage of hostile effluents, such as acid rain, road salts, fuels and motor oil.
● Abrasion
– HPDE pipe has demonstrated wear rates up to 10x less than steel.
– HDPE was originally designed for use in the aggregate mining industry which is a highly abrasive industry on pipes. HDPE was chosen because of its high resistance to abrasion of materials traveling through it.
● Ultraviolet (UV) Stabilizers
– 2% Carbon Black is used in HDPE for UV protection.
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The Culvert Inlet Device
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Hydro-Bell
An average flow increase
of 30% compared to plain
end headwalls under inlet
control conditions
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Hydro-Bell
● As head pressure
increases, the Snap-Tite®
Hydro-Bell system flow
rate increases
●“Snaps” onto the inlet end
of the Snap-Tite culvert
liner
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Hydro-Bell
●No special training or tools required to install
●Hydro-Bell makes Snap-Tite® the ideal hydraulic
option to line failing RCP culverts
●Available in all Snap-Tite® liner sizes 6” through
63”
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Slip-Lining Pipe
12” to 63” diameter
meets AASHTO M
326 requirements
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Unload liner - No special care in handling
needed
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Clean Culvert of Debris and Rocks
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Prepare culvert for lining and install anti-flotation strips if desired
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Nosecone required with section
or alignment problems
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Insert first liner section into the culvert
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Insert first liner section into the culvert
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Add Gasket to Male End of Snap-Tite Pipe
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Position the next section
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Preparing to snap sections together with
either chains and come-alongs or use a cable
as shown below
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Come-Along and Chain Method
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Snapping Snap-Tite Together
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Pulling the assembled sections into the culvert
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Bulkhead
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Build A Bulkhead Around End of Culvert
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Grouting the annular space
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Determining Grout Requirements
● Grouting helps the liner
stop leaks
● Grouting fills voids
● Grouting reinforces the
liner inside the old
culvert
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Culvert ends after grouting completed
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Oval Snap-Tite Pipe
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Product Advantages
● HDPE pipe is not brittle – it works well in cold weather climates compared to other plastic piping materials
● Snap-Tite HDPE Pipe can be pushed or pulled through existing culvert with ease
– Hard to damage during installation
● Snap-Tite HDPE Pipe meets ASTM D-3212
– The joint must be water-tight with gaskets to prevent infiltration or exfiltration
● Snap-Tite HDPE Pipe meets AASHTO M-326-08
● “N” factor of Snap-Tite HDPE Pipe is .00914
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Summary
● Snap-Tite HDPE Pipe provides a feasible alternative to replacement of failing
culverts
● Hydraulic capacity is usually maintained or increased
● HDPE liners provide structural strength and are very durable even in extreme
conditions
● Grouting the annular space and filling in the voids that are present is the most
critical step in rehabilitating a failing culvert. Skipping this step does not solve
the problem at hand