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From page 588... ... 588 Recommended ABC Construction Specifications XX Special Requirements for Prefabricated Elements and Systems for Accelerated Bridge Construction Table of Contents XX.1 GENERAL XX.1.1 Description XX.1.2 Benefits XX.2 RESPONSIBILITIES XX.2.1 Design XX.2.2 Construction XX.2.3 Inspection XX.3 MATERIALS XX.3.1 Description XX.3.2 Concrete XX.3.3 Steel XX.3.4 Closure Pours XX.3.5 Grout XX.3.6 Couplers XX.4 FABRICATION XX.4.1 Qualifications of the Fabricator XX.4.2 Fabrication Plants XX.4.3 Fabrication Requirements XX.4.4 Fabrication Tolerances XX.4.5 Yard Assembly XX.5 SUBMITTALS XX.5.1 Shop Drawings XX.5.2 Assembly Plan XX.6 QUALITY ASSURANCE XX.7 HANDLING, STORING, AND TRANSPORTATION A p p e n d i x H Read the entire page →
From page 589... ... 589 XX.8 GEOMETRY CONTROL XX.8.1 General XX.8.2 Camber and Deflection XX.8.3 Equalizing Differential Camber XX.8.4 Finishing of Bridge Deck XX.8.4.1 Diamond Grind Bridge Deck XX.8.4.2 Saw Cut Groove Texture Finish XX.9 CONNECTIONS XX.9.1 Requirements for UHPC Joints in Decks XX.9.2 Requirements for Mechanical Grouted Splices XX.9.3 Requirements for Posttensioned Connections XX 9.4 Requirements for Bolted Connections XX.10 ERECTION METHODS XX.11 ERECTION PROCEDURES XX.11.1 General Requirements for Installation of Precast Elements XX.11.2 General Procedure for Superstructure Modules XX.11.3 General Procedure for Pier Columns and Caps XX.11.4 General Procedure for Abutment Stem and Wingwalls (supported on piles) Read the entire page →
From page 590... ... 590 xx.1 General XX.1.1 Description This specification for prefabricated elements and modular systems for Accelerated Bridge Construction (ABC) supplements the requirements of the LRFD Construction Specifications. Read the entire page →
From page 591... ... 591 illustrating the anticipated construction methods (suggested erection sequence) as well as details to facilitate the anticipated construction methods (such as lifting lugs or similar) Read the entire page →
From page 592... ... 592 verify that the proposed erection methods are executed in the field and that the final in-place bridge elements meet provisions per plans and special provisions. Specific contractor meansand-methods should be reviewed to ensure the contractor's methodology conforms to the assumptions made during design and/or addresses concerns that may arise if deviating from the original design intent. Read the entire page →
From page 593... ... 593 flexural strength at 28 days shall be 5,000 psi. The compressive strength shall be measured by ASTM C39. Read the entire page →
From page 594... ... 594 2. Site Casting If the contractor elects to fabricate the non-prestressed bridge elements at a temporary casting facility, the casting shall comply with the provisions listed below: A Read the entire page →
From page 595... ... 595 6. Surface Finish Finish as surfaces which will be exposed in the finished structure as provided in Section 8.10 of the LRFD Bridge Construction Specifications. Read the entire page →
From page 596... ... 596 XX.4.5 Yard Assembly Contractor should ensure that the prefabricated elements will fit-up and align properly before shipping from the precast facility. Assembling each superstructure and substructure composed of prefabricated elements in the yard prior to shipping the elements to the project site would be a suitable way for performing such verification. Read the entire page →
From page 597... ... 597 The assembly plan shall include, but not necessarily be limited to, the following: • A work area plan, depicting known utilities overhead and below the work area, drainage inlet structures, protective measures, etc. • Details of all equipment that will be employed for the assembly of the superstructure, substructure, and approach slabs. Read the entire page →
From page 598... ... 598 4. Prevent cracking or damage of precast components during handling and storage. Read the entire page →
From page 599... ... 599 2. Precast Element Sizes The size of precast elements should be finalized by the precaster and the contractor with consideration for shipping restrictions, equipment availability, and site constraints. Read the entire page →
From page 600... ... 600 6. Transportation Minimum compressive strength prior to moving unit shall be 4,500 psi or as provided in the project plans or specifications. Read the entire page →
From page 601... ... 601 elevations because one corner is farther "up" the camber curve than the other corner. Consequently, for a skewed girder, the top elevation of the deck at the obtuse corner is higher than at the acute corner. Read the entire page →
From page 602... ... 602 Crane-Assisted Leveling – A crane is used to lift one end of the girder to bring the connectors near the middle of the girder into vertical alignment with the adjacent girder's connectors. Welds are made or clamps are installed and the crane incrementally lowers the lifted end to progressively bring further connectors along the longitudinal joint into vertical alignment. Read the entire page →
From page 603... ... 603 tolerances should be as recommended by the manufacturer. The grouting process should follow the manufacturer's recommendations for materials and equipment. Read the entire page →
From page 604... ... 604 Advantages of this type of erection method include the following: • Conventional cranes are readily available for purchase or rental. • Construction crews are familiar with working with conventional cranes. Read the entire page →
From page 605... ... 605 Potential disadvantages include required custom design and fabrication as well as limited use based on field conditions. C XX.10.2.3 Self-Propelled Modular Transporters There are families of high-capacity, highly maneuverable transport trailers called Self-Propelled Modular Transporters (SPMTs) Read the entire page →
From page 606... ... 606 6. Temporarily support, anchor, and brace all erected modules as necessary for stability and to resist wind or other loads until they are permanently secured to the structure. Read the entire page →
From page 607... ... 607 3. Adjust the devices prior to full release from the crane if vertical leveling devices are used. Read the entire page →

From page 588...

... 588 Recommended ABC Construction Specifications XX Special Requirements for Prefabricated Elements and Systems for Accelerated Bridge Construction Table of Contents XX.1 GENERAL XX.1.1 Description XX.1.2 Benefits XX.2 RESPONSIBILITIES XX.2.1 Design XX.2.2 Construction XX.2.3 Inspection XX.3 MATERIALS XX.3.1 Description XX.3.2 Concrete XX.3.3 Steel XX.3.4 Closure Pours XX.3.5 Grout XX.3.6 Couplers XX.4 FABRICATION XX.4.1 Qualifications of the Fabricator XX.4.2 Fabrication Plants XX.4.3 Fabrication Requirements XX.4.4 Fabrication Tolerances XX.4.5 Yard Assembly XX.5 SUBMITTALS XX.5.1 Shop Drawings XX.5.2 Assembly Plan XX.6 QUALITY ASSURANCE XX.7 HANDLING, STORING, AND TRANSPORTATION A p p e n d i x H