FDOT Standard Plans Index 102-201: Temporary Detour Bridge Series 700

Design Criteria

Design Criteria AASHTO LRFD Bridge Design Specifications ; Structures Design Guidelines ( SDG ) ; Acrow Panel Bridging Series 7 00 XS Technical Handbook

Design Assumptions and Limitations

Design Assumptions and Limitations Temporary bridges on limited access facilities with design speeds greater than 45 mph require the use of the 700 Series ACROW bridges. These Standards are based on the FDOT current inventory of temporary ACROW bridge components which are manufactured in accordance with ACROW Series 7 00 Refer to " Acrow Panel Bridging Series 7 00 XS Technical Handbook " f or temporary bridge dimensions, capacities and component designations. Contact the Structures Design Office to obtain a copy of this 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 for a given project. Establish temporary bridge length to accommodate project geometric needs, environmental permits, drainage requirements, etc.

. Details presented in the standards show the basic layout of the Truss configuration (Single or double high) and double or triple truss . Type of truss configuration is based on span length and loading, work with ACROW on project specific requirements .

Temporary b ridge is designed to be launched from one end. Vary span lengths in increments of 10' with 30' minimum . 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 Distribu tio n 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. Do not place the temporary bridge on a vertical curve.

A constant grade is acceptable. Refer to " Acrow Panel Bridging Series 7 00 Technical Handbook " for maximum grade and elevation tolerance from constant grade (Bent to Bent and Cross - Slope) for final cap elevations. Do not use the temporary bridge on a horizontal curve.

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. ACROW railings are TL - 4 rated with a maximum of 5” of asphalt at the gutterline.

To accommodate debris drift clearances, set Low Member Elevation as follows: For single span bridges, at the bottom of the Transom. Standard Plan s Instructions Topic No. 625 - 010 - 003 Index 102 - 201 Temporary Detour Bridge Series 700 For multiple span bridges, at the bottom of the Distributi on 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 . Calculate wind force on superstructure (WS) assuming a sup erstructure height of 5’ - 0” . Use factors for trus ses with sharp - edged members to select the drag coefficient (C D ) and skew c oefficient s ( LRFD Tables 3.8.1.2.1 - 2 and 3.8.1.2.3a - 1 respectively).

The treatment of the approach and trailing ends shall consist of the Thrie - Beam guardrail . A ppropriate guardrail treatments beyond the begin/end of approach slab shall be determined by the Roadway Engineer. As a minimum, if no other hazards are present, an End Anchorage Assembly Type II shall be provided on the trailing end.

On approach ends utilizing the Thrie - Beam Approach Transition, a Transition Block or Curb i s required at the end of the bridge. A Transition Block is not required on trailing ends of br idges with no opposing traffic; however, a curb may be required due to drainage needs. …

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
• - 201 Temporary Detour Bridge Series 700 Instructions for Design Standards Topic No. 625
• - 201 Temporary Detour Bridge Series 700