Elastomeric Bearings Art. 1083.01
3.Geotechnical Fabric Attachment to the Frame.
a.Welded Wire Mesh Frame. The woven or nonwoven geotextile fabric shall be wrapped 3 in. (75 mm) over the top member of a 6 in. x 6 in. (150 mm x 150 mm) welded wire mesh frame and secured with fastening rings constructed of wire conforming to ASTM A 641, A 809, A 370, and A 938, as applicable, at 6 in. (150 mm) on center. The fastening rings shall penetrate both layers of geotextile and securely close around the steel mesh. The geotextile shall be secured to the sides of the welded wire mesh with fastening rings at a spacing of 1 per sq ft (11 per sq m) and securely close around a steel member.
b.Collapsible Aluminum Frame. The woven or nonwoven fabric shall be secured to the aluminum frame along the top and bottom of the frame perimeter with strips of aluminum secured to the perimeter member, such that the anchoring system provides a uniformly distributed stress throughout the geotechnical fabric.
4.Certification. The manufacturer shall furnish a certificate with each shipment of above grade inlet filter assemblies stating the amount of product furnished and that the material complies with these requirements. SECTION 1082. PREFORMED BEARING PADS
1082.01 Fabric Bearing Pads. Fabric bearing pads shall consist of a fabric
and rubber body made with new unvulcanized rubber and unused fabric fibers. The rubber body shall be a natural rubber compound known as natural polyisoprene or synthetic rubber known as polychloroprene. The average surface hardness expressed in standard rubber hardness shall be 80 ± 10 Shore A Durometer. The ultimate breakdown limit of the pad under compressive loading shall be no less than 7000 psi (48,000 kPa) for the specified thickness without splits or deformations exceeding 10 percent of thickness after removing the load. The pads shall be furnished to specified dimensions with all dowel holes accurately located. The thickness of the fabric bearing pads shall be as shown on the plans within a tolerance of ± ten percent. SECTION 1083. ELASTOMERIC BEARINGS
1083.01 Description. Elastomeric bearings shall consist of steel laminated
elastomeric pads or assemblies of steel laminated elastomeric pads with externally bonded structural steel bearing plates, structural steel top bearing plate, and required stainless steel and PTFE sheets, as shown on the plans and as specified herein. The Art. 1083.02 Elastomeric Bearings manufacturer shall be listed as compliant through the NTPEP program. The Department will maintain a qualified producer list. Shop drawings of the bearing assemblies shall be submitted to the Engineer. The bearing assemblies shall be furnished as a complete unit from one manufacturing source. The bearing manufacturer shall furnish to the Engineer of Concrete, Soils and Metals at the Bureau of Materials (126 East Ash Springfield, IL 62704) a purchase order for each contract. The purchase order shall contain, as a minimum, the quantity and size of each type of bearing to be furnished.
1083.02 Materials. Materials shall be according to the following.
a.Properties of the Elastomer. The elastomer compound used in the construction of the bearings shall contain only virgin crystallization resistant polychloroprene (neoprene) or virgin natural polyisoprene (natural rubber) as the raw polymer. All materials shall be new with no reclaimed material incorporated in the finished bearing. The elastomer compounds shall be classified as being of low-temperature, Grade 3, as specified by the minimum grade requirements of Table 14.7.5.2-1, “Low Temperature Zones and Minimum Grade of Elastomer”, of the AASHTO LRFD Bridge Design Specification. Low temperature zones used in this table are as defined in Figure 14.7.5.2-1, “Temperature Zones”, of the same publication. The cured elastomer shall be according to the following requirements. The properties of the cured elastomeric compound material shall be determined using samples taken from actual bearings. Material 1/ 2/ Property ASTM Standard Test Requirements Polyisoprene (Natural Rubber) Polychloroprene (Neoprene) Physical Properties D 2240 Hardness 55 ± 5 Shore “A” points 55 ± 5 Shore “A” points D 412 Min. Tensile Strength 2250 psi (15,500 kPa) 2250 psi (15,500 kPa) Min. Ultimate Elongation 400% 400% Heat Resistance D 573 at Specified Temp. Specified Temp. of Test 158 °F (70 °C) 212 °F (100 °C) Aging Time 168 hours 70 hours Max. Change in Durometer Hardness +10 Shore “A” points +15 Shore “A” points Max. Change in Tensile Strength -25% -15% Max. Change in Ultimate Elongation -25% -40% Adhesion 3/ to Steel ITP 603 Bond Strength (Peel Test) 40 lb/in. (7 N/mm) 40 lb/in. (7 N/mm) D 429, B Adhesion Failure R-80% R-80% 1/ All material tests shall be conducted at 73 ± 4 °F (23 ± 2 °C) unless otherwise noted.
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 1076–1077 of 1,217. View official source ↗