269 ALASKA 2020 SECTION 516 EXPANSION JOINTS, BE ARINGS, AND WATERSTO PS
516-1.01 DESCRIPTION . Furnish and ins tall expansion joints, bearings, and waterstops.
516-2.01 MATERIALS. Use materials that conform to the following:
Grout Subsection 701- 2.03 Bridge Seals Subsection 705- 2.03 Expanded Polyethylene Subsection 705- 2.06 Structural Steel Section 716 Elastomeric Bearing Pads Subsection 720- 2.01 Epoxy Adhesive for Elastomeric Bearing Pads Subsection 720- 2.02 Polytetrafluoroethylene (PTFE) Bearings Subsection 720- 2.03 Waterstops Section 723 CONSTRUCTION REQUIREMENTS
516-3.01 EXPANSION JOINTS. Locate and form expansion joints as shown on the Plans.
1.Shop Drawings . Provide shop drawings for expansion joints having a total movement of more than 1.75 inches. Submit drawings showing installation procedures and joint assembly details. Install joints only after shop drawi ngs are approved.
2.Manufacture and Fabrication.
a.Open Joints . Place open joints where shown on the Plans. Remove forms without chipping or breaking the corners of the concrete. Do not extend reinforcement across an open joint, unless shown on the Plans.
b.Filled Joints . Construct expansion joints with expanded polyethylene joint filler as thick as the width of the joint. Cut the joint filler to the same shape and size as the adjoining surfaces. Fix the joint filler against the concrete surfaces in place to k eep the joint filler from displacing when concrete is placed. Immediately after removing the forms, inspect the expansion joints. Remove concrete or mortar that has sealed across the joint.
c.Compression Seals . Shape the joint as shown on the Plans. Install the seal according to the manufacturer’s instructions. Install the seal in one piece for the full width of the roadway joint. Install the seal immediately after the curing period of the concrete.
d.Strip Seals . Use expansion joint strip seals in one piece for the length of the joint. Shape the steel components to conform to the section of the concrete. Ensure that the surface in the finished plane is true and free of warping. When placing the joints, use methods to keep them in correct position during conc rete placement that do not affect or modify the structure or joint. Install the expansion joints according to the manufacturer's recommendations. Adjust the joint opening for the dimensions indicated on the Plans.
e.Steel Joints . At the shop, shape the plat es, angles, or other structural components to conform to the section of the concrete. Fabricate and paint structural shapes to meet the specifications covering those items. Ensure that the surface in the finished plane is true 270 ALASKA 2020 and free of warping. When placing the joints, use methods to keep them in correct position during concrete placement that do not affect or modify the structure or joint. Meet the joint opening dimension shown on the Plans.
f.Modular Seals . Shape the joint as shown on the Plans. Use expansion joint modular seals in one piece for the length of the joint. Ensure that the surface in the finished plane is true and free of warping. When placing the joints, use methods to keep them in correct position during concrete placement that do not affect or modify the structure or joint. Install the expansion joints according to the manufacturer's recommendations. Adjust the joint opening for the dimensions indicated on the Plans.
g.Silicone Expansion Joint Seals . Prepare concrete surface by sandblasting each face until the surface is roughened and all contaminants are removed. Ensure all joint faces are sound, clean, dry, and free of frost immediately prior to sealant application. Install a bond breaking backing material that is configured per the sea lant manufacturer’s specifications. Install the sealant according to the manufacturer’s recommendations.
3.Tolerances . Install expansion joints conforming to the following tolerances:
a.Top Surface Profile : 1/4 to 5/8 inch recessed from the finished roadway profile.
b.Surface Irregularities (deviation from a 10- foot straight edge): ±1/8 inch.
c.Gap Width: ±1/4 inch.
516-3.02 BEARINGS. Install bearing at locations shown on the Plans.
1.Shop Drawings . Provide shop drawings showing all details of the bearings and of the materials proposed for use. Fabricate bearings only after shop drawings are approved.
2.Packaging, Handling, and Storage. Prior to shipment from the point of manufacture, package the bearings in a manner to ensure that each bearing will be protected from damage during shipment, handling, and storage. Store the bearings in an area that provides protection from environmental and physical damage. Prior to installation, clean the bearings of all foreign substances.
3.Construction and Installation. Set the bear ing plates, sole plates and elastomeric bearing pads as shown on the Plans in the exact position with full and even bearing on properly finished bearing seats. Do not use shims to set bearing plates, sole plates, or elastomeric bearing pads. Finish bearin g areas or grind them to elevation and parallel to the roadway grade and parallel to the roadway cross slope or crown, unless otherwise shown on the Plans. When shown on the Plans, place grout under masonry plates. Mix and place grout according to the manufacturer’s written recommendations. Clean concrete areas that will contact the grout. Remove loose or foreign matter that would prevent the bond between the mortar and the concrete surfaces. Tightly pack the grout under the masonry plates to provide full bearing. After placing, cover exposed surfaces of grout pads with a heavy thickness of burlap saturated with water for 3 days. Do not place a load on the grout until the grout has attained a compressive strength of 5000 psi as determined by field specimen. Locate sole plates to correspond with the temperature during erection. Anchor bearing securely. Adjust the nuts on anchor bolts at the expansion ends of spans to permit the span to move freely. Burr threads sufficiently to prevent removal of nuts. 271 ALASKA 2020 Apply epoxy adhesive to the bottom surface of the elastomeric bearing pads before placing them. Do not move the pad until the epoxy has cured and full adhesion is achieved. Do not apply epoxy adhesive to elastomeric bearings used in PTFE bearing assemblies.
4.Tolerances . Install bearings conforming to the following tolerances:
a.Horizontal Position: ±1/8 inch
b.Elevation: ±1/8 inch
c.Grade and cross slope: ±1/16 inch per foot.
516-3.03 Waterstops.
Furnish a waterstop that is capable of accommodating joint movement equal to half the bearing pad height or as shown on the Plans.
1.Waterstop Sealing Systems. Furnish and install a waterstop sealing system where specified on the Plans. Use full -length segments of waterstop strip tape for straight portions of joints. Prepare the surface and install the waterstop sealing system following the manufacturer’s instructions. Overlap strip tape according to the manufacturer’s recommendations, but not less than 2 inches
2.Embedded Waterstop. Furnish and install embedded waterstop wher e and as specified on the Plans. Use full -length segments of embedded waterstop for straight portions of joints. Follow the manufacturer’s instructions for the embedded waterstop and concrete application. Remove and replace damaged waterstops.
516-4.01 M ETHOD OF MEASUREMENT . See Section 109 and the following:
1.Expansion Joint . The sum of the lengths of joints complete in place, measured along the centerline of the joint.
2.Bearings . Measured per unit, complete in place.
3.Waterstops . The sum of the lengths of waterstops complete in place, measured along the centerline of the waterstop.
516-5.01 Basis of Pa Yment.
When Items 516.0001.____, 516.0002.____, or 516.0003.____ do not appear on the bid schedule, this work is subsidiary. Payment will be made under: PAY ITEM Item Number Item Description Unit 516.0001.____ Expansion Joint,______ LF 516.0002.____ Bearings, (Type) EACH 516.0003.____ Waterstops LF 272 ALASKA 2020 SECTION 520 TEMPORARY CROSSINGS
520-1.01 DESCRIPTION . For each site where public traffic uses a temporary crossing or a
Contractor uses a temporary crossing that is elevated over a public route, construct and maintain the temporary crossing. Remove temporary crossings after use and cleanup the site. Design temporary bridges, change the preliminary design of approach roads to accommodate temporary bridges, and have an independent design check performed. Inspect and perform quality acceptance on temporary bridges.
520-1.02 Definitions .
DESIGNER OF RECORD ( DOR). A civil engineer registered as a Professional Engineer in the State of Alaska, and in responsible charge of the work described. The DOR must have adequate and relevant prior bridge design and inspection experience. The DOR may delegate portions of design, quality acceptance, and inspection work, to qu alified technicians. The DOR and qualified technicians must not be supervised by, or under the direction of the Contractor’s temporary crossing superintendent and work crew. INDEPENDENT ENGINEER (IE). An engineer registered as a Professional Engineer in the State of Alaska, and in responsible charge of the independent design check. The engineer responsible for the check must have adequate and relevant prior bridge design experience. The engineer responsible for the check shall not be employed by the Contr actor or the same firm as the Designer of Record; or employed by a firm managed or owned by the Contractor or the Designer of Record; nor shall the engineer performing the work manage or own the Contractor or the firm employing the Designer of Record. INDEPENDENT DESIGN CHECK (IDC). An independent design check of the temporary bridge package including but not limited to: design, location and dimensions of the foundation, structural members, connections, erection plan and temporary bracing (when required), safety barrier, and independent calculations of design loads, member stress, material properties, hydraulic capacity and scour protection. TEMPORARY BRIDGE. A temporary bridge used by the public or over a public route, including abutments, piers, safety ba rrier and railing, foundation scour protection, and other incidentals. TEMPORARY BRIDGE PAC KAGE (TBP). Design calculations from the DOR and IE, working drawings, specifications, load rating, and all items identified on Form 25D -080, necessary to construct a temporary bridge. TEMPORARY CROSSINGS. A detour route that includes temporary bridges, approach roads and other incidentals. MATERIALS AND DESIGN
520-2.01 MATERIALS. New or used materials must meet the requirements of the design and the
Contract. The DOR must verify the quality of temporary bridge materials before incorporation into the project.
520-2.02 GEOTECHNICA L DATA AND HYDROLOGY REPORT. The Department may provide
records of geotechnical investigations. The Contractor is responsible for obtaining all additional geotechnical data necessary for design and construction of the temporary crossings. The Department may provide a preliminary hydrology and hydraulics report. The Contractor is responsible for obtaining all additional hydrology and hydraul ics data necessary for design and construction of the temporary crossings.
Source: Alaska Standard Specifications for Highway Construction, 2020 Edition. Pages 297–299 of 584.