425-1 Description.
Construct inlets, manholes, and junction boxes from reinforced concrete as shown in the Standard Plans and the Plans. Furnish and install the necessary metal frames and gratings. Construct yard drains from concrete meeting the requirements of Section 347. Adjust structures shown in the Plans to be adjusted or requiring adjustment for the satisfactory completion of the work. For precast structures, meet the requirements in 449 -1.
425-2 Composition and Proportioning.
425-2.1 Concrete: For inlets, manholes, and junction boxes, use Class II or IV concrete,
as designated in the Plans and Standard Plans and as specified in S ection 346. For concrete aprons and yard drains , use concrete as specified in Section 347.
425-2.2 Mortar: For brick masonry, make the mortar by mixing one-part cement to three
parts sand. Miami Oolitic rock screenings may be substituted for the sand, pro vided the screenings meet the requirements of 902 except for gradation requirements. Use materials passing the No. 8 sieve that are well graded from coarse to fine. Submit documentation , from a Department approved mine or a Department approved concrete pla nt, confirming the sand or sand substitute meets the requirements of 902 -3.2. Preblended m asonry cement mortar may be used in lieu of the above -specified mortar. Deliver the product in original and unopened packages properly identified by brand name of manufacturer, net weight of package, and type. Store the material in full compliance with the manufacturer’s recommendations . Material must be used within manufacturer’s recommended shelf life.
425-3 Materials.
425-3.1 General: Meet the following requirements:
Sand (for mortar) ................................ ................. Section 902 Portland Cement ................................ .................. Section 921 Water ................................ ................................ ...Section 923 Reinforcing Steel ................................ Sections 931 and 415 Liner Repair Systems ................................ ..........Section 948 Brick and Concrete Masonry Units ..................... Section 949 Castings fo r Frames and Gratings ....................... Section 962 Masonry Cement, Type M or S........................... ASTM C91 Preblended Dry Masonry Cement Mortar, Type M or S ....... ................................ ................................ ......... ASTM C1714
425-3.2 Gratings, Covers, and Frames: Use gratings and frames fabricated from
structural steel or cast iron as designat ed in the appropriate Standard Plans Index . When “Alt. G” grates are specified in the Plans, provide structural steel grates that are galvanized in accordance with the requirements of ASTM A123 and hardware galvanized in accordance with the requirements of ASTM A153. FY 2023-24 Return to Table of Contents Use rigid frames and covers either 24 inches or 36 inches or optional three -piece adjustable frames and covers as indicated in Standard Plans , Index 425-001. For three-piece adjustable frames, the inner frame may include replaceable resilient seats to support the cover. In addition, the inner frame shall indicate it is adjustable, by clearly having the word “adjustable” imprinted into the exposed portion of the inner frame so “adjustable” is visible from the roadway after installation.
425-3.3 Skimmer: Include 1.5% by weight of carbon black with plastic skimmers on
french drain systems.
425-4 Forms.
Design and construct wood or metal forms so that they may be removed without damaging the concrete. Build forms true to line and grade and brace them in a substantial and unyielding manner. Obtain the Engineer’s approval before filling them with concrete.
425-5 Precast Inlets, Manholes, and Junction Boxes.
Precast inlets, manholes , and junction boxes, designed and fabricated in accordance with the Plans, the Standard Plans and Section 449 may be substituted for cast -in-place units.
425-6 Skimmers .
Furnish and install skimmers in accordance with the Plans and Sta ndard Plans.
425-7 Construction Methods.
425-7.1 Excavation: Excavate as specified in Section 125.
Where unsuitable material for foundations is encountered, excavate the unsuitable material and backfill with suitable material prior to constructing or se tting inlets, manholes and junction boxes. As an option to the above and with the Engineer’s approval, the Contractor may carry the walls down to a depth required for a satisfactory foundation, backfill to 8 inches below the flowline with clean sand and cast a non -reinforced 8 inch floor.
425-7.2 Placing and Curing Concrete: Place the concrete in the forms, to the depth
shown in the Plans, and thoroughly vibrate it. After the concrete has hardened sufficiently, cover it with suitable material and keep it moist for a period of three days. Finish the traffic surface in accordance with 522 -7.2, or with a simulated broom finish approved by the Engineer.
425-7.3 Setting Manhole Castings: After curing the concrete as specified above, set the
frame of the casti ng in a full mortar bed composed of one-part portland cement to two parts of fine aggregate.
425-7.3 1 Standard Castings: Set manhole frames in a mortar bed and adjust to
grade using brick or concrete grade rings, with a maximum 12 inch adjustment.
425-7.3 2 Optional Adjustable Castings: When using a three -piece adjustable
frame and cover, install the frame and cover with brick or concrete grade rings to the base course height. Make adjustments using the inner frame in accordance with the manufacturer’s installation recommendations so the inner frame and cover meet the grade and slope of the pavement surface opened to traffic.
425-7.4 Reinforcing Steel: Follow the construction methods for the steel reinforcement
as specified in Section 415.
425-7.5 Laying Brick: Brick masonry may be used if the structure is circular and
constructed in place, or for adjustments of rectangular risers up to a maximum 12 inches in FY 2023-24 Return to Table of Contents height. Saturate all brick with water before laying. Bond the brick thoroughly into the mortar using the shove -joint method to lay the brick. Arrange headers and stretchers so as to bond the mass thoroughly. Finish the joints properly as the work progresses and e nsure that they are not less than 1/4 inch or more than 3/4 inch in thickness. Do not use spalls or bats except for shaping around irregular openings or when unavoidable at corners.
425-7.6 Backfilling: Backfill as specified in Section 125, meeting the sp ecific
requirements for backfilling and compaction around inlets, manholes, and junction boxes detailed in 125 -8.1 and 125 -8.2. However ; for outfall lines beyond the sidewalk or future sidewalk area, where no vehicular traffic will pass over the pipe, inle ts, manholes, and junction boxes, compact backfill as required in 125 -9.2.2.
425-7.7 Adjusting Structures: Adjust existing manholes, catch basins, inlets, valve
boxes, etc., within the limits of the proposed work, to meet the finished grade of the propose d pavement, or if outside of the proposed pavement area, to the finished grade designated in the Plans for such structures. Adjust structures prior to placement of final asphalt pavement surface layer. Adjust structures to match final pavement surface cros s-slope. Use materials and construction methods which meet the requirements specified above to adjust the existing structures. The Contractor may extend manholes needing to be raised using adjustable extension rings of the type which do not require the r emoval of the existing manhole frame. Use an extension device that provides positive locking action and permits adjustment in height as well as diameter and meets the approval of the Engineer. When adjusting structures in flexible pavement, restore final r oad surface in accordance with Standard Plans, Index 125-001.
425-8 Method of Measurement.
The quantities to be paid for will be the number of inlets, manholes, junction boxes, and yard drains, completed and accepted; and the number of structures of these types (including also valve boxes) satisfactorily adjusted. Performance Turf will be paid in accordance with Section 570.
425-9 Basis of Payment.
425-9.1 New Structures: Price and payment will be full compensation for furnishing all
materials and complet ing all work described herein or shown in the Plans, including all clearing and grubbing outside the limits of clearing and grubbing as shown in the Plans, all excavation except the volume included in the measurement designated to be paid for under the ite ms for the grading work on the project, all backfilling around the structures, the disposal of surplus material, and the furnishing and placing of all aprons, gratings, frames, covers, and any other necessary fittings.
425-9.2 Adjusted Structures: When an item of payment for adjusting manholes, valve
boxes, or inlets is provided in the proposal, price and payment will be full compensation for the number of such structures designated to be paid for under such separate items, and which are satisfactorily adj usted, at the Contract unit prices each for adjusting inlets, adjusting manholes, and adjusting valve boxes. For any of such types of these structures required to be adjusted but for which no separate item of payment is shown in the proposal for the specific type, payment will be made under the item of adjusting miscellaneous structures. FY 2023-24 Return to Table of Contents
425-9.3 Payment Items: Payment will be made under:
Item No.425 - 1- Inlets - each. Item No.425 - 2- Manholes - each. Item No.425 - 3- Junction Boxes - each. Item No.425 - 4- Adjusting Inlets - each. Item No.425 - 5- Adjusting Manholes - each. Item No.425 - 6- Adjusting Va lve Boxes - each. Item No.425 - 8- Adjusting Miscellaneous Structures - each. Item No.425 - 10- Yard Drains - each. Item No. 425 - 17- Back of Sidewalk Endwall - each. FY 2023-24 Return to Table of Contents SECTION 430 PIPE CULVERTS
430-1 Description.
Furnish and install drainage pipe and end sections at the locations called for in the Plans. Furnish and construct joints and connections to existing pipes, catch basins, inlets, manholes, walls, etc., as may be required to complete the work. Obtain pipe culverts and drainage products from a plant that is currently on the Department’s Production Facility Listing. Producers seeking inclusion on the list shall meet the requirements of Section 105. At the beginning of each project, submit a notarized certification statement to the Engineer in accordance with Section 6. The Quality Control Manager’s stamp or label on each product indicates certification that the product was fabricated in conformance with the P roducer QC Plan, the Contract, and this Section. Ensure that each shipment of drainage products to the project site is accompanied with a QC signed or stamped delivery ticket providing the description and the list of the products. When the Producer Qualit y Control Program is suspended by the Department, accept responsibility of either obtaining products from a plant with an approved Quality Control Program, or await re -approval of the plant. The Engineer will not allow changes in Contract Time or completio n dates as a result of the plant’s loss of qualification. Accept responsibility for all delay costs or other costs associated with the loss of the plant’s qualification. Construct structural plate pipe culverts or underdrains in accordance with Sections 435 and 440. For pipe culverts installed by jack & bore, install in accordance with Section 556.
430-2 Materials.
430-2.1 Pipe: Meet the following requirements:
Concrete Pipe ................................ ................................ .........Section 449 Steel Pipe ................................ ................................ ...............556-2.1 Round Rubber Gaskets ................................ .......................... Section 942 Resilient Connec tors* ................................ ............................ Section 942 Corrugated Steel Pipe and Pipe Arch ................................ .....Section 943 Corrugated Aluminum Pipe and Pipe Arch ........................... Section 945 Corrugated Polyethylene Pipe ................................ ................ Section 948 Steel Reinforced Polyethylene Ribbed Pipe .......................... Section 948 Steel Reinforced Polyethylene Corrugated Pip e .................... Section 948 Corrugated Polypropylene Pipe ................................ .............Section 948 Corrugated Polyvinyl Chloride (PVC) Pipe .......................... Section 948 Fiberglass Reinforced Polymer Pipe ................................ ......Section 948 Metal Grates ................................ ................................ ...........Section 962 *Use resilient connector products listed on the Department’s Approved Produ ct List (APL).
430-2.2 Joint Materials: Use joint materials specified in 430 -7 through 430 -9 according
to type of pipe and conditions of usage. FY 2023-24 Return to Table of Contents