541.1 General Description
This work consists of constructing, maintaining, and removing detour bridges. Construct detour bridges the width and length required on the plans. (The bridge width is the clear distance between curbs or hubguards.) Construct the bridges at the locations required on the plans and provide the necessary end walls or bulkheads as part of the work.
541.1.01 Definitions
General Provisions 101 through 150.
541.1.02 Related References
A. Standard Specifications Section 104—Scope of Work Section 105—Control of Work Section 540—Removal of Existing Bridge B. Referenced Documents AASHTO HS-15 AASHTO Standard Specifications for Highway Bridges Georgia Standard 4960 and 4961
541.1.03 Submittals
A. Bridge Design Considerations Unless otherwise shown, design detour bridges for an AASHTO HS-15 live load capacity. This capacity is based on the working stresses allowed for the materials used and for the design criteria of the AASHTO Standard Specifications for Highway Bridges. The Contractor may omit lane loadings from design considerations. Load factor design is allowed. B. Bridge Drawings Submit the proposed layout and details for each detour bridge to the Engineer for review as follows: 1. Do not begin work until the drawings have been approved. 2. Submit drawings in either of the following forms: • Three prints • A reproducible drawing The Engineer can require the Contractor to change the drawings to conform to the specifications. 3. After making required changes, resubmit the drawings for final review.
541.2 Materials
Use materials approved by the Department. Material restrictions are as follows: • Do not use timber in the superstructure. • Do not use structurally unsound materials of any type. Piling may be timber. Tight bark does not need to be removed from timber piles.
541.2.01 Delivery, Storage, and Handling
General Provisions 101 through 150.
541.3 Construction Requirements
541.3.01 Personnel
General Provisions 101 through 150.
541.3.02 Equipment
General Provisions 101 through 150.
541.3.03 Preparation
General Provisions 101 through 150.
541.3.04 Fabrication
General Provisions 101 through 150.
541.3.05 Construction
A. Construct the Detour Bridge Construct the detour bridge according to drawings approved by the Engineer. B. Construct Safety Features Construct either of the following safety features at both ends of the detour bridge: 1. Guard rail Construct according to the Construction Details shown in the plans. 2. Precast median barrier according to Ga. Std. 4960 and 4961 When the precast median barrier option is selected, construct the barrier as follows: a. Place the precast median barrier on both sides and both ends of the detour bridge unless otherwise directed by the Engineer. b. Ensure that the barrier extends at least 40 ft. (12 m) from the bridge ends unless the plans show otherwise. C. Remove the Detour Bridge After the permanent construction is open to traffic, remove the detour bridge according to Section 540. Material salvaged from the detour bridge remains the property of the Contractor. Consider the salvage value when compiling the bid.
541.3.06 Quality Acceptance
General Provisions 101 through 150.
541.3.07 Contractor Warranty and Maintenance
A. Maintain the Detour Bridge Except as otherwise provided in Subsection 104.05.D, Detours Outside Right-of-Way, maintain the detour bridge so it can safely carry the design loading at all times. Furnish labor and material to maintain the bridge. If the Engineer determines that the detour bridge endangers public safety, promptly repair the bridge. If the bridge is not repaired immediately, the Engineer will proceed according to Subsection 105.15, Failure to Maintain Roadway or Structures.
541.4 Measurement
This work will not be measured separately for payment.
541.4.01 Limits
General Provisions 101 through 150.
541.5 Payment
This work will be paid for at the Contract Price per detour bridge complete in place, maintained, and removed. Payment will be made under: Item No. 541 Detour bridge (requires width, length, and sta. no.) Per lump sum
541.5.01 Adjustments
After the detour bridge is completed, the Engineer will include 80 percent of the Contract Price for the detour bridge in the next statement. After the detour bridge is satisfactorily removed, the Engineer will include the remaining 20 percent in the next statement.
Detour Bridges in other states
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