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CITY OF EVERETT <br /> CHAPLAIN BRIDGE INSTALLATION DETAILS,SPECIFICATIONS,AND REQUIREMENTS <br /> plates shall be beveled across their width in order to provide a level bearing condition on <br /> the elastomeric pads. <br /> 9.2 Elastomeric Pads <br /> 9.2.1 The Bearing plates will be placed on top of elastomeric pads. Elastomeric pads shall be <br /> designed in full accordance with AASHTO LRFD Bridge Design Specifications. The <br /> temperature range shall be site specific and shall be obtained from the Tables in <br /> AASHTO Section 3.12.2.2 Temperature Range. <br /> 10.0 PRECAST CONCRETE SILLS&ANCHOR PLATES <br /> 10.1 Precast Concrete Sills <br /> 10.1.1 Precast concrete sills shall be designed and supplied by the Bridge Manufacturer. The <br /> precast concrete sills shall be cast by a plant which carries the National Precast Concrete <br /> Association(NPCA)certification. The precast concrete sill(s)shall be 2'-2"deep by 5'- <br /> 0"wide by 18'long. The precast concrete sill shall be reinforced with stirrups and <br /> longitudinal reinforcing bars(minimum Grade 40),and have a minimum concrete <br /> strength of 4000psi. A 2"minimum concrete cover shall be maintained for all <br /> reinforcing. Lifting lugs shall be installed to aid in the unloading and placement of the <br /> precast concrete sills. <br /> 10.2 Anchor Plates <br /> 10.2.1 On top of the precast concrete sill,an ASTM A588 plate(1/2"thick by 6"wide and <br /> running the entire length of the sill)shall be embedded into the concrete with shear <br /> studs. This top plate will be used to attach the anchor plates via field welding by the <br /> Contractor. Corner embed angles shall be installed in the sills to allow for the field <br /> welding together of the multiple sections prior to the installation of the full bridge <br /> superstructure. Anchor plates will consist of two 1.25"diameter by 5"long fully- <br /> threaded zinc plated rods welded to the surface and spaced to match the hole spacing in <br /> the bridge bearing plates and elastomeric pads. Two nuts and one washer(all <br /> galvanized)shall be supplied with each rod. <br /> 10.3 Allowable Soil Bearing Capacity for Sill <br /> 10.2.2 The soil onto which the precast concrete sills are to be set has a maximum allowable <br /> bearing pressure of 2,000 psf. Contractor and Owner are responsible for verifying the <br /> soil capacity and following all recommendations by the project Geotechnical Engineer <br /> to assure that the soil capacity is met. <br /> 11.0 BACK WALLS <br /> 11.1.1 The back wall system shall be comprised of two pieces of Big R Bridge sheet piling,or <br /> approved equivalent,extending 3'-4"in total height minimum. The sheet piling shall be <br /> of 10 gauge material. The length of the top piece of sheet pile shall be equal to the <br /> bridge width plus 5 feet. The length of the bottom piece of sheet pile shall be equal to the <br /> bridge width plus 10 feet. Back walls shall be designed to support the backfill and <br /> applied traffic loads. <br /> 11.1.2 The finish of the sheet pile shall be as follows: Galvanized. <br /> 12.0 FABRICATION <br /> 12.1 Welding <br />