Z Metal Corrugations Pipe Class Steel Aluminum A 64 60 1 1½”x ¼” --- B 79 75 2 ⅔” x ½” --- C 109 105 3 3” x 1” --- D 138 135 5 5” x 1” --- E 168 164 6 6” x 2” --- 7 7½” x ¾” x ¾” --- F 188 --- I or 1 --- I G 218 --- II or 2 --- II H 249 --- III or 3 --- III J 4 Bolts/Ft 280 -- IV or 4 --- IV K 6 Bolts/Ft 280 100 V or 5 --- V L 8 Bolts/Ft 280 125 M 313 150 N 375 185 P --- 200 X Concrete Pipe Q --- 225 H Horizontal Elliptical R --- 250 V Vertical Elliptical
395 SECTION 605 MANHOLES AND INLETS
605.1 -DESCRIPTION : This work shall consist of the construction of new and adjustment of existing manholes and inlets in accordance with these Specifications and in reasonably close conformity with the lines, grades, dimensions and locations shown on the Plans or established by the Engineer. Types of manholes and inlets shall be as shown on the Plans.
605.2 -MATERIALS : Cast-In-Place concrete and reinforcing steel for manholes and inletss hall meet the requirements of Sections 601 (Class B) and 602 respectively. Precast concrete manholes shall conform to subsection 715.19. Portland cement concrete for precast inlets shall meet the requirements in subsection 715.19. Other requirements and details for precast inlets shall be as specified on the Plans. Other materials shall meet the requirements specified in the following Subsections of
MATERIAL SUBSECTION Aggregate for Perforated Slot Inlets (Aggregate For Fabric Underdrain) 606.2 Clay or Shale Brick 715.16 Concrete Brick 715.17 Concrete Masonry Blocks 715.18 Fabric for Perforated Slot Inlets 715.11 Gray Iron Castings 709.10 Joint Mortar 708.8 Manhole Steps 709.10, 715.19, 715.38 Pipe for Slot Inlets 713.2
Lean grout backfill, where specified on the Plans, shall consist of 3 bags of cement per cubic yard of material suitable to the Engineer. Component materials shall be sampled, tested, and approved prior to the start of manufacture. Manholes and inlets shall be inspected at the manufacturing plant, if acceptable they shall be identified in accordance with MP 700.00.01. All materials will be subject to inspection for acceptance as to condition at the latest practicable t ime the Engineer has the opportunity to check for compliance prior to or during incorporation of materials in the work. Covers and frames for manholes and grates, frames, and grate support bars for inlets shall be gray iron castings except for Type G Inle ts which require structural steel meeting 709.12.
605.3 -CONSTRUCTION METHODS : Concrete construction shall conform to the requirements for Section 601. Masonry shall conform to the requirements for t he respective type. Exposed masonry surfaces shall be cured with wet burlap for a period of not less than 48 hours. Concrete surfaces shall be cured in accordance with subsection 601.12.
396 Metal frames for inlets shall be set in a full mortar bed or cast into the concrete. Pipe sections shall be flush on the inside of the structure wall and project outside sufficiently for proper connection with the next pipe section. Masonry shall fit neatly and tightly around the pipe. The flowline of the outlet pipe shall match the bottom elevation of the inlet or manhole. When the bell or groove of concrete pipe is placed in an inlet, the inside of the bell or groove shall be filled with concrete up to the flowline. Bearing areas of frames, covers, and grates shall be so fitted and finished as to provide a firm, even seat for the entire cover or grate in the frame. No projections shall exist on the bearing areas of the castings; and the cover or grate shall seat in the frame without rocking. Concrete inlets and ma nholes may be precast when shapes and dimensions conform to those shown on the Plans and when final installed top surfaces are flush with adjacent finish surfaces such as pavement, gutters, curbs, and sidewalks. Precast units shall include lifting hooks which will be out of sight after placement of the units and sufficient reinforcement to resist handling stresses. Excavation and backfill shall be done in accordance with Section 212. Weep holes shall be installed in the sidewalls of inlets during construction. These weep holes shall be constructed of non -rusting material, approximately four ( 4) inches in diameter, located at or below subgrade elevation as directed or approved by the E ngineer to properly drain subsurface material. Loose rock shall be placed around the outside of the structure at the openings or similar protective measures taken to prevent excessive backfill material from passing through the weep holes. The cost of wee p hole installations shall be included in the unit price bid for the inlets. No deduction in concrete quantities shall be made for weep holes in the inlets. When grade adjustment of existing structures is specified, the work shall be accomplished by one of the following methods:
reset the existing frame in a full mortar bed at the required elevation. ii. Carefully remove the existing cover or grate and furnish and install an ap proved adjusting ring or casting.
Upon completion, each structure shall be cleaned of any accumulations of silt, debris, or foreign matter of any kind and shall be kept clear of such accumulation until final acceptance of the work.
605.4 -METHOD OF MEASU REMENT : Manholes and inlets, new , modifed, or adjusted will be measured by the unit; slot inlets will be me asured by the linear foot in place.
605.5 -BASIS OF PAYMENT : The quantities, determined as provided above, will be paid for as provided below, which prices and payments shall be full compensation for furnishing the excavation, backfill, concrete, aggregate, reinforcin g steel, fabric, grates, covers, frames, hardware, and other materials shown on the Plans and for doing all the work, including all labor, tools, equipment, supplies and incidentals necessary to complete the work. When changes in Plans during construction require increases of depth in excess of one (1) foot, the equitable price adjustment will be equal to the bid amount increased by a factor of the constructed depth less one ( 1) foot divided by the Plan depth.
397 When grade and drain contracts are bid separa tely from paving contracts, the structure may be designated to be partially built by the grade and drain Contractor and later completed by the paving Contractor. When inlets or other drainage structures are to be constructed to Final Grade, as shown by the Plans, the Contractor shall provide positive drainage in coordination with their means and methods throughout the duration of the project to protect the roadway and all other areas that are within the limits of the project. There will be no direct payme nt by the Division for partial inlet construction or other intermediate drainage structure construction to maintain positive drainage that the contractor is in control of.
605.6 -PAY ITEMS : ITEM DESCRIPTION UNIT 605001 -* Type A Manhole Each 605002 -* Type B Manhole Each 605003 -* Type A Inlet Each 605004 -* Type B Inlet Each 605005 -* Type C Inlet Each 605006 -* Type D Inlet Each 605007 -* Type E Inlet Each 605008 -* Type F Inlet Each 605009 -* Type G Inlet Each 605010 -* Type H Inlet Each 605011 -* Type J Inlet Each 605012 -* Adjusting Inlet Type , “type” Each 605013 -* Adjusting Junction Box Each 605014 -* Modified Inlet, “type” Each 605015 -* Adjusting Manhole Type , “type” Each 605016 -* Modified Manhole, “type” Each 605020 -* Install Inlet Grate, “type” Each 605039 -* Junction Box Each 605040 -* “size” Perforated Slot Inlet Linear Foot 605041 -* “size” Slot Inlet Linear Foot 605050 -* Adjust Concrete Headwall Each 605051 -* Type U Inlet Each
* Sequence number