FDOT Standard Plans Index 102-200: Temporary Detour Bridge - 300 Series

Design Criteria

Design Criteria AASHTO Standard Specifications for Highway Bridges , 17th Edition (superstructure); AASHTO LRFD Bridge Design Specifications (substructure); Structures Design Guidelines ( SDG ) ; Acrow Panel Bridging Series 300 Technical Handbook

Design Assumptions and Limitations

Design Assumptions and Limitations These Standards apply to non - limited access facilities with design speeds of 45 mph and less. A variation is required otherwise. These Standards are based on the FDOT current inventory of temporary bridge components which are manufactured in accordance with Acrow Series 300 Double Wide design.

Details presented in these Standards are for a Triple Single (three panels per side, one p anel high) configuration and incorporating the Double Wide Light Transom (two - lane). Refer to " Acrow Panel Bridging Series 300 Technical Handbook " f or temporary bridge dimensions, capacities and component designations. Contact the Structures Design Office to obtain a copy of this handbook.

The Acrow Panel Bridging with the Triple Single configuration with two lanes of traffic is designed to meet a HS25 - 44 loading at the Inventory Level for spans up to 50 feet (ref. page 86 of the Technical Handbook). The FDOT Office of Maintenance maintains the inventory of FDOT owned temporary bridge components.

Contact the Office of Maintenance to coordinate the availability of temporary bridge components that are required for a given project. Establish temporary bridge length to accommodate project geometric needs, environmental permits, drainage requirements, etc., using the following span length and arrangement criteria. Details presented in the standards assume one single span or the use of continuous spans for multiple span bridges.

Limit continuous length of bridge to 360' in accordance with these standard details. If a total bridge length in excess of 360' is required, supplemental details are required for the mid - bridge expansion joint(s) and associated intermediate bent support(s). Vary span lengths in increments of 10' with 30' minimum and 50' maximum span lengths.

60' continuous span lengths may be permitted with concurrence from the State Bridge Maintenance Office. For continuous spans , the ratio of adjacent span lengths shall not be less than 6:10 to prevent the shorter span from lifting off its bearings under live load. Specify Distributing Beams at all intermediate supports for all span lengths.

The Approach Span and Ramp Span are to be simple spans, each 5' - 0" in length, to eliminate Live Load uplift at the backwall bent and grade beam support. Standard Plan s Instructions Topic No. 625 - 010 - 003 Index 102 - 200 Temporary Detour Bridge - 300 Series Do not place the temporary bridge on a vertical curve.

A constant grade is acceptable. Do not use the temporary bridge on a horizontal curve. Refer to " Acrow Panel Bridging Series 300 Technical Handbook " for maximum grade and elevation tolerance from constant grade (Bent to Bent and Cross - Slope) for final cap elevations.

The temporary bridge is to have a zero cross - slope. Provide asphalt buildup transitions to a zero cross slope outside the limits of the temporary bridge. To accommodate debris drift clearances, set Low Member Elevation as follows: For single span bridges, at the bottom of the Transom.

For multiple span bridges, at the bottom of the Distributing Beam. Design the pile cap connection to pile assuming the truss reaction with a minimum of 3" eccentricity. Design of this connection detail is the responsibility of the Engineer of Record.

Select a pile type considering the driving capacity requirements of the production piles on the permanent bridge, free standing height, water levels if present and soil conditions. Design the substructure according to current AASHTO LRFD Bridge Design Specifications and the SDG for Strength Limit States III & V and Service Limit State I . For open - grate deck Triple Single dead load reactions, approximate the superstructure dead load as 1.42 Kip/Ft.

Calculate wind force on superstructure (WS) assuming a sup erstructure height of 5’ - 0” . …

Payment

Payment Item number Item Description Unit Measure 102 - 2 - AA Special Detour LS 102 - 71 - 14 Barrier Wall, Temporary, F&I, Type K LF 102 - 71 - 24 Barrier Wall, Temporary, Relocate, Type K (if required) LF 102 - 73 Temporary Guardrail LF

What your plans must show

Plan Content Requirements for this index — the SPI's checklist for designers.

• Plans for temporary bridge shall, as a minimum, cover the following:
• 2. Simple span bearing details if non
• - continuous spans are selected.
• 3. Grade change details at the extremities of the bridge.
• 4. Plan and elevation sheets with span lengths, stationing, alignment, grade and boring locations.
• 5. Foundation layout sheet including pile spacing & bent stationing.
• 6. Temporary Bridge Pile Data Table as shown below in accordance with SDG 3.5 and SDM 11.4 included in the contract plans with the Foundation Layout sheets. Modify table and notes as required to accommodate the required number of piles and bents. When not enough space is available on one plan sheet, continuation of the Data Table is accept able. See FDM 115 for more information regarding use of Data Tables.
• - specific approach and trailing end treatments.
• Instructions for Design Standards Topic No. 625
• - 200 Temporary Detour Bridge
• - 300 Series Instructions for Design Standards Topic No. 625
• - 200 Temporary Detour Bridge