468 THREE -SIDED REINFORCED CONCRETE BRIDGE/CULVERT
620.1 -DESCRIPTION : This work shall consist of furnishing the design, construction plans, materials, and construction of single piece precast or cast -in-place reinforced concrete three -sided flat -topped bridge/culverts or single piece precast reinforced concrete three -sided arch -topped bridge/culverts or a two -piece precast reinforced concrete continuous arch bridge/culverts, with headwalls and wingwalls, in accordance with these specifications and in reaso nably close conformity with the lines, grades, design, and dimensions shown in the plans.
620.2 -GENERAL : The bridge/culvert design and detail plans for construction shall be submitted t o the Engineer for approval. The time required for preparation and review of these submittals shall be charged to the allowable contract time. Delays caused by untimely submittals or insufficient data will not be considered justification for time extensio ns. No additional compensation will be made for any additional material, equipment, or other items found necessary to comply with the project specifications as a result of the Engineer's review. The proposed bridge/culvert design shall be compatible with the Contractor's proposed method of construction, and shall be compatible with any method of construction shown in the plans. The Division does not assume nor warrant any bridge/culvert system's compatibility with any particular construction methods.
620.3-DESIGN CRITERIA : 620.3.1 -General: The following data will be provided on the contract plans:
box i n addition to the bearing capacity and roadway profile.
The size of all structural elements shall be determined such that the design load stresses do not exceed the allowable stresses found in the AASHTO LRFD Bridge Design Specifications, latest editio n. The structural design of the two -piece precast reinforced concrete arch bridge/culverts shall provide for a structurally reinforced section at the crown/closure section such that the completed arch bridge/culvert is structurally continuous. If parape ts are used on any portion of the headwalls and wingwalls as shown in the plans, they shall be designed to resist traffic loads in accordance with the AASHTO LRFD Bridge Design Specifications, latest edition. The load shall be a HL -93 (HS25) test level 3. The length and height of the wingwalls and headwalls must be designed to accommodate the specified fill slope without fill encroaching on the underlying streambed, waterway or edge