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I / I Barrier
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I/I Barrier Specifications
PRODUCT DESCRIPTION: There are no specific
standards regarding its use or installation other than those published by
the manufacture and the practice of good engineering principles.
The design and intended application of this product is simple and apparent.
It is a molded polymer shield that is incorporated into the chimney section
of a manhole assembly. Properly installed, the I/I Barrier provides an
impermeable shield against the infiltration of ground water and eroded soil.
It is an established fact that grade rings alone, whether they are concrete,
plastic or rubber will not provide a leak proof system. Ground movement from
freeze/thaw cycling and traffic flow will loosen joints and allow the system
to leak. When the I/I Barrier is installed, it provides an inner wall that
diverts the inflow back out instead of into the collection system.
The I/I Barrier is cut to height and installed on top of the cone. The cut
height is determined by adding the adjustment ring stack up dimension to the
inside height of the cover frame. Caution should be used to not interfere
with the complete seating of the cover into the frame. The joints between
the cone and the I/I Barrier is sealed using butyl mastic caulk as described
in the general installation instructions. The adjustment rings, cover frame
and cover are then installed as usual.
INSTALLATION SPECIFICATION: The bottom surface of the I/I BARRIER flange
shall be sealed to the manhole cone top surface using a butyl sealant as
specified by the manufacture of the I/I BARRIER.
The sealant shall be applied to the top surface of the manhole cone section
only. Sufficient sealant must be used to accommodate flaws in the cone
surface and “out-of-flat” conditions. The amount of sealant and its
placement will be determined by the condition of the cone. This
determination will be the responsibility of the contractor installing the
I/I BARRIER. The I/I BARRIER is then centrally seated on the cone against
the sealant. The bottom adjustment ring is then centrally placed on the top
surface of the I/I BARRIER flange using no sealant.
If plastic adjustment rings with a vertical tongue are being used, the
tongue must be cut off to allow the bottom ring to set flush on the I/I
BARRIER flange. This removal should be done per instructions from the
adjustment ring manufacturer. The chimney section is then completed based on
the type of adjustment rings being utilized.
SEALANT SPECIFICATION: I / I Sealant as distributed by Strike Products or an
approved equal.
Strike Bond Butyl Rubber Sealant as distributed by Strike Products or
approved equal.
Material must meet or exceed the requirements of ASTM C-990 and AASHTO M-198
specifications.
FIELD TESTING INSTALLATION FOR LEAKS: A simple field test can be utilized to
assure the integrity of the seal between the I/I BARRIER and the manhole
cone prior to back-filling the installation.
Fill the excavated area around the chimney section with water to a level
above the joint between the I/I BARRIER and the manhole cone top. NOTE:
Sufficient weight must be applied to the I/I BARRIER flange to affect a
seal. Inspect the area inside the manhole below the cone upper edge for any
signs of leakage. If moisture is present, sufficient sealant has not been
applied to affect a seal. Reseal as necessary and retest.
MANUFACTURING: The I/I Barrier is molded using proven manufacturing
standards established by the Association of Rotational Molders. A job sheet
is maintained for each production run documenting materials, machine
settings and quality checks. The manufacturing process is controlled to
assure a quality part that meets the molding specifications and performance
requirements of the application.
MATERIALS: The I/I Barrier is manufactured from medium density polyethylene
as defined by ASTM designation D 1248 and having the following properties:
PROPERTY TEST METHOD VALUE
Melt Index ASTM D-1238 4.5
Density ASTM D-792 .938
Tensile strength at yield, psi ASTM D-638 2800
Elongation at break, % ASTM D-638 400
Flexural Modulus, tangent, psi ASTM D-790 115,000
ESCR ASTM D-1693 1000
UL-94 @ .060 & @ .120 thickness UL-94 HB
Deflection Temp, 88 psi, °C D-648 83
Deflection Temp, 264 psi, °C D-648 42
Low Temp Impact, -40°C, ft-lb ARM
68
This plastic resin produces a product that has
excellent low temperature impact resistance, excellent environmental stress
crack resistance and it is highly resistant to degradation from sunlight. UV
resistance was tested in accordance with SAE Test Procedure J-1960. The
material shows an increase in elongation at break values and an 87%
retention of tensile strength after 10,000 hours exposure.
PERFORMANCE SPECIFICATION: As there are no performance criteria specific to
the I/I Barrier, we are defaulting to Federal Specification A-A-60005 dated
March 2, 1998. which applies to Manhole Frames, Covers, Gratings, Steps,
Sump and Catch Basins. Section 3.3.1 Traffic Loads, calls for a transverse
proof-load strength of 25,000 pounds. Proof-load testing is being done in
accordance with AASHTO Designation M-306 Standard Specification for Drainage
Structure Castings. This specification outlines the test and required
results as follows:
1) A 40,000 pound test load is concentrated on a 9 x 9 inch area of the
product.
2) The load is maintained for one minute
3) Upon removal, the test sample is inspected. Any visible cracks or
permanent deformation shall be cause for failure.
On May 29, 2002 the following testing was conducted by American Engineering
Testing with the noted results. A complete test report is available upon
request.
Procedure
Seven test samples, 9” x 9” x 0.2” ± were prepared for testing. Six of the
samples were loaded to 40,000 lbs. for one minute per AASHTO specification
M-306. The seventh sample was loaded to 100,000 lbs. for three minutes. The
samples were measured for thickness at four locations to the nearest 0.001”
before and after loading for visible signs of cracking or permanent
deformation. Test loading was performed using a Forney Model No. LT-810 load
tester with a F96 load indicator, calibrated on January 16, 2002. Measuring
was performed with a Mitutoyo 6” digital caliper Model CD 6BS, calibrated on
April 4, 2002.
Results
All seven samples showed no change in thickness and no visible cracking or
obvious permanent deformation. Based on the above testing done in an
independent test facility, we offer the following statement: A 25,000 pound
load distributed over the 533 square inch area of the I/I Barrier flange
represents a 47 pounds per square inch load. Passing the proof-load testing
of AASHTO Designation M-306 represents a load bearing capacity in excess of
494 pounds per square inch. When we multiply the 494 pounds per square inch
value over the 533 square inches of bearing surface, we have a product load
capacity of over 250,000 pounds or 125 tons. It is easy to see that 25,000
pounds will not be a problem. The testing done to the 100,000 pound loading
more than verifies this correlation. In addition, backfilling around the
manhole chimney structure and encapsulation of the cover frame in the
roadbed prevent any lateral forces being transferred to the I/I Barrier.
Copyright 2006 Strike Products is a division of Strike Tool.