Overview
Installation Procedure
Nose Cone Design
Flowable Fill Specifications

Installation PDF(146K) is a downloadable file of the information from this section of Culvert Lining.
Requires Adobe Acrobat Reader

Overview of Installation

People
Highway departments can use their own crew - no special training is necessary. Using only shovels, a backhoe, and come-along chains, a team of four men can easily rehabilitate a culvert. Buy the Snap-Tite Culvert Lining System today, keep it in your yard until bad weather causes some down time for your people and install it that day. What would be wasted payroll time becomes a protective, money-saving project.

Equipment
Snap-Tite is so easy to install that most jobs can be completed with a backhoe, shovels, a come-along and chains.

Product
This diagram illustrates the design attributes and numbering system of Snap-Tite.

Back to top

Installation Procedure

Step 1
Select and prepare the existing culvert. Inspect the culvert to ensure the liner can be inserted without obstruction. Flush and/or clean the existing culvert.

Step 2
Insert one end of Snap-Tite Liner into existing culvert. This can be done by pulling or pushing the pipe using a variety of techniques. Leave about five feet exposed prior to this step. It may be necessary to create a "nose cone" by cutting the ends of the pipe. See diagram of nose cone in the Nose Cone Design section.

Step 3
Position the next section of Snap-Tite Liner with proper alignment. Place the opposing end of a second section against the exposed end of the first section. The two sections must be in alignment and have the same slope.

Step 4
Install a gasket. Install a gasket on the male end to ensure a water-tight seal. The gasket should be installed in the groove furthest from the end.

Step 5
Attach the chains and couplings. Double-wrap the chains approximately two feet from the coupling or tighten with chain binders. Attach one chain hoist on each side of the coupling.

Step 6
Snap liner together. Align the ends with the male bevel inside of the female bevel. Pull the couplings together, forcing the female end to expand and allow the male end to move into the female end. When lands and grooves are aligned the couplings will "snap" and lock together.

Step 7
Push joined liners into culvert and repeat until completely lined. Remove chains, push joined liners into culvert and repeat steps 1-5. Each new piece of pipe is snapped onto the preceding pipe and pushed or pulled into the culvert, leaving enough pipe protruding from the culvert to join with the next length of pipe.

Step 8
Seal the culvert ends and grout the annular space. Seal the annular space between the Snap-Tite liner and the existing pipe with an appropriate grout. It is recommended that the annular space between the existing culvert and the liner pipe be grouted. This will help fill the voids created by previous washouts, provide additional structural support, and prevent point loading. For specifications or more information, call your local Ready Mix supplier or the National Ready Mixed Concrete Association at (301) 587-1400. The Flowable Fill Specifications section contains a suggested guide specification for flowable fill from the Texas Aggregates and Concrete Association.

Back to top

Nose Cone Design

Side View
L = about 12" to 16"
Dn = about 3/4 Dia. of pipe

Example: 24" pipe, Dn = 18"
36" pipe, Dn = 27"
42" pipe, Dn = 32"

End View
Make 8 Dove Tails
Drill hole - 1/2 +/- about 1" from point of Dove Tail.

Draw pieces toward each other by connecting wire to opposite holes and twisting the wire to tighten.

All dimensions can be varied to suit specific conditions

Back to top

Suggested Guide Specifications for Flowable Fill General This specification identifies the basic requirements for furnishing, mixing, and transporting flowable fill. Flowable fill backfill material is suitable for use as a structural backfill material, beneath foundations, for filling utility trenches, excavations inside buildings, abandoned pipes and tanks, and all routine backfilling. The material may also be used for placements in water.
Materials Materials shall conform to:
Cement	ASTM C 150
Fly Ash	ASTM C 618, Class C or Class F
Water	ASTM C 94
Fine Aggregate	Natural or manufactured sand, or a combination thereof, free from injurious amounts of salt, alkali, vegetable matter or other objectionable material. It is intended that the fine aggregate be fine enough to stay in suspension in the mortar to the extent required for proper flow. The fine aggregate shall conform to the following gradation:
	Sieve Size %Passing 3/4 inch     100 No. 200     0-10 If a flowable mixture cannot be produced, the sand may be rejected.
Admixtures - ASTM C 260 and/or C 494 Mix Design The following are given as typical mix designs for trial mixes. Adjustments of the proportions may be made to achieve proper solid suspension and optimum flowability. Admixtures may be used if desired to improve the characteristics of the mix. The suggested quantities of dry material per cubic yard are as follows:
No. 1 Cement 50 lbs.   Fly Ash 250 lbs. Fine Aggregate 2910 lbs. Water (approx.) 60 gal. No. 2 Cement 100 lbs.   Fly Ash 250 lbs. Fine Aggregate 2800 lbs. Water (approx.) 60 gal. No. 3 Cement 100 lbs.   Fly Ash 300 lbs. Fine Aggregate 2600 lbs. Water (approx.) 70 gal. Fine Aggregate 2600 lbs.
Consistency Consistency shall be tested by filling an open-minded three inch diameter cylinder six inches high to the top with flowable fill. The cylinder shall be immediately pulled straight up and the correct consistency of the flowable fill shall produce a minimum eight inch diameter circular-type spread with no segregation. Batching, Mixing and Transportation Materials are to be measured by weight and/or volumetric methods. The flowable fill may be mixed in a central concrete mixer, a ready mix truck, or by other acceptable methods. The flowable fill shall be transported to the point of placement in a revolving drum mixer or in an agitator unit. Measurement Measurement shall be by the cubic yards delivered. Payment Payment shall be for the measured quantity. The unit price for the flowable fill shall be full compensation for furnishing, hauling, and mixing all materials including the labor, tools, equipment, and incidentals necessary. (Note: If desired, placement of the flowable fill may also be included in this item.)

Back to top

< PREVIOUS PAGENEXT PAGE >