Laserfiche WebLink
DRAINAGE STRUCTURES <br /> 1 ) GENERAL <br /> A) Under this item , the Contractor shall build and/or install new catch basins , manholes , dropholes , <br /> drop inlets , junction boxes , leaching basins and the like of the types and at the locations shown <br /> on the Drawings . <br /> 2 ) MATERIALS <br /> A) The materials used in the construction of these structures shall comply with Section 345 " Portland <br /> Cement Concrete" (Type II ) , Section 415 " Reinforcing Steel' (Grade 40) , and Section 425-3 <br /> " Materials " of the FDOT Specifications . <br /> B ) Sand - cement riprap shall conform to Section 405 of the these Specifications . <br /> 3) CONSTRUCTION DETAILS , <br /> A) Construction of the structures shall conform to the details as shown on the Drawings and , unless <br /> otherwise specified , shall conform with Section 425 " Inlet , Manholes , and Junction Boxes" of the <br /> FDOT Specifications . Required minimum compaction shall be 95 percent of maximum density <br /> (AASHTO T180) and 100 percent of maximum density (AASHTO T- 180 in areas of paving or <br /> curbing . <br /> B) The Contractor shall submit shop drawings for review and approval on all precast structures prior <br /> to granting fabrication approval . <br /> 4) GRATES , FRAMES , AND COVERS <br /> A) Grate , frame and cover castings shall be of uniform quality and free from blowholes , porosity , <br /> hard spots , shrinkage , cracks or other injurious defects . They shall be smooth and well cleaned <br /> by shot blasting and , unless otherwise specified , shall be covered with a smooth coating of coal <br /> tar pitch varnish of a type which will be tough , tenacious , and resilient throughout the range of <br /> expected service temperatures . <br /> B) Material used in the manufacture of the castings shall conform to ASTM Specifications A-48 <br /> Class 30 Iron or to United States Government Specifications QQI -652 , (latest revision ) for gray <br /> iron castings . <br /> C ) All castings shall be manufactured true to pattern and with a close fit of component parts . <br /> Frames and covers in roadway and traffic areas shall be of non-rocking design or shall have <br /> machined bearing surfaces so that fitting parts will not rattle or rock under traffic . <br /> D) All grates , frames and covers located within road right-of-way or traffic areas shall be capable of <br /> withstanding the AASHTO H-20 vertical , dynamic wheel load . <br /> D-2- 1 <br />