DESCRIPTION
609.01.01 General. This work consists of constructing or reconstructing inlets, manholes, and similar
structures. MATERIALS
609.02.01 General. Material shall conform to the following Sections and Subsections:
Portland Cement Concrete ................................ ..................................................................................................................... Section 501 Reinforcing Steel ................................ .................................................................................................................................... Section 505 Grout and Mortar Aggregate .................................................................................................................................... Subsection 706.03.04 Miscellaneous Metal ................................ ............................................................................................................................... Section 712 Gray Iron Castings .................................................................................................................................................. Subsection 712.03.02 Portland cement concrete shall be Class A or Class AA unless otherwise provided. Precast manhole materials shall conform to AASHTO M199 (ASTM C478). Tongue and groove joints and gasket ed joints shall conform to Subsection 707.03.02. Concrete for concrete collars placed around manholes, valves, covers, etc., shall be a fast -setting concrete when required as specified in Subsection 609.03.02. Use fast -setting concrete products listed in the QPL. Mix mortar for setting grates in the proportions of 1 part Portland cement to 3 parts of mortar aggreg ate by volume. Add only enough water to permit placing and packing of the mortar. Supply castings true to pattern in form and dimensions, free from pouring faults, sponginess, cracks, blow holes, and other defects in positions affecting strength and value for the service intended. Boldly fillet at angles and make sharp and perfect ar rises in castings. Sand blast or otherwise effectively clean castings of scale and sand so as to present a smooth, clean, and uniform surface. Castings of frames, grates, rings, and covers for inlets, manholes, and other structures shall meet H -20 loading requirements according to AASHTO M306. Pipe crossbars for drop inlets shall be standard weight black pipe conforming to ASTM A53. Structural steel for grates and frames for drop inlets shall conform to ASTM A36. Do not paint or galvanize grates, frames, or castings. CONSTRUCTION
609.03.01 General. Construct inlets and manholes according to Section 502. Place inlet and outlet pipes before
pouring concrete. Manhole sections shall be installed with tongue and groove joints or gasket ed joint s. Manholes specified to have watertight joints shall be installed with gasket ed joints . Install manhole sections, sealants , and gaskets as specified by the manufacturer. Submit a copy of t he manufacturer’s installation instructions prior to installation . Lubricate gaskets requiring lubricant with the lubricant recommended by the manufacturer . Precast inlets and manholes that require the diversion of public traffic during their construction. Do not begin excavations required for such structures until the structures have been precast, cured, and are ready for installation. Once installation has been commenced, continuously work on a working day by working day basis thereon until such time as public traffic is allowed the use of the area as approved. For restrictions on when to construct inlets or manholes to final grade see Subsection 613.03.06. Set grates in ful l mortar beds or otherwise secure as shown on the plans. Set grates accurately to the final elevations. Construct concrete covers to fit snugly and be readily removable. 609 INLETS AND MANHOLES Extend pipe for inlet or outlet connections through the walls and beyond the outside s urfaces of the walls a sufficient distance to allow for connections. Make joints waterproof around the outer surfaces of such pipe. Commercially prefabricated frames and grates of equal or greater capacity and strength may be substituted for the design shown on the plans for inlets provided prior approval is obtained in writing. Matchmark frames and grates in pairs before delivery to the work. Grates shall fit into their frames without rocking. Where pipe grates are designated for use, substitution of ot her type grates will not be permitted.
609.03.02 Adjusting Manhole and Valve Covers. Adjust existing manhole, valve , and meter covers, etc.,
where indicated on the plans and as directed. The concrete collar required for adjusting covers is shown in the Standard Plans . Replace existing collars with concrete collars of the same size or replace the roadway structural section, matching the existing thicknesses, prior to placement of a minimum size collar. Use materials meeting the requirements of Sections 302 and 402. Prior to paving, when adjusting by Method A, or lowering covers, when adjusting by Method B, document offset ties to all utility covers to be adjusted. Include sufficient detail to ensure recovery of these locations following paving operations. S ubmit this documentation on a daily basis prior to paving and cover lowering operations. Clearly mark cover locations on the new surface immediately following paving operations and maintain these marks until the adjustments are complete. Adjust by the fol lowing methods: Method A. Use this method when removal of the existing pavement by cold milling is not required. Pave over the cover. Once all paving is completed, locate and adjust the cover to the final finished pavement level. Prevent paving materials from entering any openings in the cover. Method B. Use this method when removal of the existing pavement by cold milling is required. Before cold milling, lower the cover sufficiently to accommodate the required pavement removal depth. If the lowered cove r presents a hazard to public safety, provide protection therefrom in an approved manner. In lieu of replacing a manhole cover, use a steel plate of sufficient width and a minimum thickness of 16 mm (5/8 in.) to cover the lowered manhole. Once pavement rem oval has been completed, and the new pavement placed and completed, locate and adjust the cover to the final pavement level. Prevent existing or new paving materials from entering any openings in the cover. Method C. Use this method of adjustment outside the areas described in Methods A and B of this Subsection. Adjust covers to the required elevation. Adjusting covers or lids to the required elevation by the above methods shall require removing such existing concrete collars and covers and adjusting the top of the existing structures by removing or adding concrete, grade rings, brick masonry, or concrete block masonry, as the case may be, and reinstalling the fixtures firmly in place. Thoroughly compact the base or backfill material under the concrete collars around manholes and valves to not less than 90% of maximum density as determined by Test Method No. Nev. T108 . The in- place density will be determined by Test Method No. Nev. T102 or T103. The use of fast -setting concrete in lieu of Class A or Class AA concrete for concrete collars on adjusting covers by Method A or B may be required if the traveled way must be opened to traffic within a short period of time. Do not place traffic on concrete collars until the compressive strength of the concrete has reached a minimum of 14 MPa (2,000 psi), as measured by Test Method ASTM C39. Use the fast -setting concrete according to the manufacturer’s recommendations. Do not use aggregate to extend fast -setting concrete. Furnish a copy of the manufacturer’s installation recommendations before beginning the installation. Repair any cracks which occur in the fast -setting concrete. Perform adjustments to meet the straightedge requirements of Subsection 402.03.05. INLETS AND MANHOLES 609
609.03.03 Clean Out. Thoroughly clean all inlets, manholes, and similar structures of any accumulations of silt,
debris, or foreign matter of any kind. Also remove any such accumulations at the time of final inspection.
609.03.04 Earthwork. Perform structure excavation and backfill as necessary to construct structures. Structure
excavation and backfill shall conform to Sections 206 and 207. METHOD OF MEASUREMENT
609.04.01 Measurement. Castings and structural steel grates will be measured by the kilogram (pound). The
mass of castings will be computed from the dimensions shown on the approved shop drawings, based on a cast iron mass of 7,200 kg/m3 (450 lb/ft3), with an allowance of 10% for fillets and overrun. The mass of structural steel grates will be computed from the dimensions shown on the approved shop drawings, according to Section 506. Certified shop masses will be acceptable in lieu of computed masses. Pipe crossbars and straps for i nlets will be included in the measurement by the kilogram (pound) for structural steel grates. Adjusting covers will be measured by the each. Manholes will be measured by the each. Castings for manholes will be measured as set forth above. Structure excavation, backfill, Portland cement concrete, and reinforcing steel used in new structures of inlets will be measured and paid for as separate items as provided for under their respective Sections of these specifications. Structural steel grates for inlets will be measured as set forth above. Pipe riser inlets will be measured by the each. Structural steel grates for pipe riser inlets will be measured as s et forth above. BASIS OF PAYMENT
609.05.01 Payment. The accepted quantities, measured as provided above, will be paid for at the contrac t
price per unit of measurement for the pay items listed below that are shown in the proposal. Payment will be full compensation for the work prescribed in this Section. Payment will be made under: Pay Item Pay Unit Castings ................................ ................................ ........................................................................................................ Kilogram (Pound) Structural Steel Grates .................................................................................................................................................. Kilogram (Pound) (type) Manhole ................................ ................................ .................................................................................................................. Each (type) Manhole (Modified) ................................ ................................................................................................................................. Each Adjusting (type) Covers (method) ...................................................................................................................................................... Each Pipe Riser Inlet (type) ........................................................................................................................................................................ Each SECTION 610 RIPRAP DESCRIPTION
610.01.01 General. This work consists of furnishing and placing riprap (with or without grout), riprap bedding,
and geotextile. MATERIALS
610.02.01 General . Material shall conform to the following Sections and Subsections:
Portland Cement ................................ .................................................................................................................................... Section 701 Grout and Mortar Aggregate .................................................................................................................................... Subsection 706.03.04 Stone for Riprap ...................................................................................................................................................... Subsection 719.03.01 Aggregate for Riprap Bedding ................................ ................................ ................................................................. Subsection 719.03.02 Water ..................................................................................................................................................................................... Section 722 Engineering Fabrics ................................ ............................................................................................................................... Section 731 Compose grout of 1 part Portland cement and 3 parts grout aggregate by volume. CONSTRUCTION
610.03.01 Earthwork. Make surfaces to be protected by riprap free of brush, stumps and other objectionable
materials and dress to a smooth surface. Remove any soft or spongy material as directed and replace with approved native material. Compact filled areas as specified for embankments in Section 203. Excavations for riprap beds shall conform to Sections 203 and 206. Exca vations for trenches, footings, cutoff walls, etc., shall conform to Section 206. Gradation and compaction requirements on backfill will not apply. When shown on the plans, place a bedding layer or filter on the prepared surface as specified before the ri prap is placed.
610.03.02 Riprap. Place stone for riprap on the prepared surface by hand or mechanical means in a manner
which will produce a well graded mass of stone with a minimum practicable percentage of voids. Place the stone so as to be in close co nformity with the details shown on the plans. Place riprap to its full course thickness in one operation and in such a manner as to avoid displacement of the underlying material. Do not place riprap in layers, or by dumping into chutes, or by similar met hods likely to cause segregation. Produce a fairly compact riprap course in which all sizes of material are evenly distributed and placed in their proper proportions. Hand placement or rearrangement of individual stones by mechanical equipment may be required to secure the results specified. Replace any material displaced by any cause to the lines and grades shown on the plans.
610.03.03 Grouted Riprap. This stone shall conform to the requirements of Subsection 719.03.01 except that
gradation and grout penetration depth requirements shall be as specified in the Special Provisions. Place stone by hand or mechanical means that will produce a well graded, uniform rock blanket in close conformity with the details shown on th e plans. The finished face shall present an even, tight surface. The rock to be grouted shall be basically free of fines in order that penetration of the grout can be achieved. Wet the rock immediately prior to commencement of the grouting operation. Fill the space between the stones with grout to the depth specified. Use sufficient grout of a consistency to completely fill all voids, except leave face stones exposed to 1/4 to 1/3 their depth. Transport the grout to the place of final deposit by use of c hutes, tubes, buckets, pneumatic equipment, or any other mechanical method which will control segregation and uniformity of the grout. Use spading and rodding where penetration is achieved by gravity flow into the interstices. Cure the grouted surface as specified in Subsection 501.03.08 for a period of at least 3 days.