621INLETS, JUNCTION BOXES, MANHOLES, AND MISCELLANEOUS DRAINAGE STRUCTURES

502

This Section shall also include the furnishing and installing of stilling basins when the Item of 621-I is provided on the plans.

621.02Materials

Concrete and reinforcing steel for cast-in-place units and for precast units or parts of units not covered by other requirements shall conform to the requirements of Sections 620 and 502. Precast concrete units or portions of units shall conform to the appropriate requirements of ASTM C 478, and Section 831 unless otherwise provided by plan details or by Department approval. Masonry materials shall conform to the requirements of Section 613 utilizing brick or block meeting the following requirements:  Clay or Shale - ASTM C 32 Grade SS, MS, or MM.  Concrete brick - ASTM C 55, Type I, Grade N.  Concrete block - ASTM C 90, Type I or II, Grade N.

Castings shall conform to the requirements of Section 836 with attention directed to Articles

836.04, 836.05, 836.06, and 836.07. They shall be sound, smooth, clean, and free from blisters and

other defects and, where necessary, planed to provide flat true surfaces. Welded grates, grate seats, etc. shall be fabricated from ASTM A 36 material, unless otherwise denoted by plan details. Inlet and outlet pipe shall conform to the appropriate requirements of the section of the specifications covering the kind of pipe to which they are to connect. Grates, grate seats, etc. which are required for existing structures and are formed by welding of rolled or shaped iron shall, unless otherwise specified by plan details, comply with the following: Plates, angles, bars, etc. - ASTM A 36, Pipe - ASTM A 53; Type F, E, or S, black extra strong (X5), hydrostatic test not required. Galvanization of grates, grate seats, nuts, bolts, and miscellaneous metal hardware, when specified on the plans, shall be hot-dipped galvanized after fabrication by one of the following methods:  Casting, grates, and seats fabricated from rolled, pressed, or forged steel shapes - ASTM A 123.  Nuts, bolts, and miscellaneous hardware - ASTM A 153. The Department has established List I-9, "Inlet Grates and Seats for Drainage Structures and Miscellaneous Fabricated Items". This list is in the Department's manual, "MATERIAL, SOURCES AND DEVICES WITH SPECIAL ACCEPTANCE REQUIREMENTS." Grates, grate seats and related materials shall be furnished by the approved suppliers on this list. Information concerning this list is given in Subarticle

106.01(f) and ALDOT-355

621.03Construction Requirements

Excavation shall be performed in accordance with the appropriate requirements set forth under

Concrete units may be either poured-in-place or precast. Construction requirements relative to the two types shall conform to the following:

Construction shall conform to the requirements of Section 620.

Holes for connector pipes in base section shall be cast with connector pipe holes of the specific number and dimensions necessary to incorporate the unit into the drainage system as shown by the plans. Should installation conditions require additional pipe holes for which no holes were cast, the Contractor may make such holes as necessary provided he performs said work in a manner approved by the Engineer, and he replaces or repairs any damaged unit to the satisfaction of the Engineer. Pipe connections to the base sections shall be made using either concrete or masonry mortar. Precast bases shall be set to within 1/4 of an inch {± 10 mm} of grade on a bed of compacted foundation backfill material approximately 4 inches {100 mm} thick. INLETS, JUNCTION BOXES, MANHOLES, AND MISCELLANEOUS DRAINAGE STRUCTURES 503

Sectional precast sections used to form units shall have all joints sealed and wiped clean using one of the appropriate type sealers noted in Subitem 530.03(d)3.a.

Bricks shall be laid with full mortar joints not more than 1/2 inch {10 mm} thick. Courses shall be level and at least one course in every seven shall be a header course, unless otherwise directed. All units shall be plastered on the inside of the unit with not less than 1/2 inch {10 mm} of mortar (same as used in the laying) to a height of at least 6 inches {150 mm} above the top of the outfall structure. When specified, the outside of the structure shall be plastered with 1/2 inch {10 mm} of mortar for the height of the masonry. All brick shall be dampened during laying and plastering to ensure proper bond with mortar. The masonry shall be cured by approved methods which will ensure the mortar has sufficiently set before allowing backfilling operations. When so specified on the plans and/or in the proposal, masonry units may be constructed of concrete blocks instead of bricks. Applicable construction details shall be the same as for brick masonry.

Pipe shall be laid in accordance with the appropriate requirements of the Section of these specifications covering the kind of culvert pipe used. Pipe placed in masonry for inlet or outlet connections shall extend through the walls and beyond the outside surface of the walls a sufficient distance to allow for connections, and the masonry shall be carefully constructed around them so that there will be no leakage around the outer surface of the pipe. Pipe connections to masonry or precast units shall be made using either concrete or masonry mortar.

Castings shall be set in full mortar beds or otherwise secured as shown on the plans. The mortar used for setting castings shall conform to Section 611, Mortar for Masonry. Castings shall be set below the finished grade of the pavement about 2 mm.

Backfilling shall be performed in accordance with the appropriate requirements of Sections 210 and 214.

All junction boxes, inlets, manholes, and similar structures shall be cleaned of all form material, excess mortar, and all foreign matter and shall be free from such at the time of final inspection and acceptance.

Grates and seat frames shall be set in full mortar beds or otherwise secured to the masonry unit as shown by plan details. Mortar used for setting grates shall conform to the requirements of Section 611, Mortar for Masonry. Grates installed on drainage units constructed under a previous contract shall be fitted to the unit and affixed to the structure in accordance with the details shown on the plans.

621.04Method of Measurement

Inlets and junction boxes will be measured as individual units including footings, bottom slab, walls, cover, lid, grating, etc., of the type, size, and shape shown on the plans. If the height of the base unit is not shown on the plans, 4 feet {1 m} will be used as the height of the base unit. Measurements will be from the top of the bottom slab to the top of the cover, grating, or lid. Structures of greater height will have the additional height measured as noted in Subarticle (c) below.

Manholes will be measured as an individual unit including footings, bottom slab, walls, cover, lid, grating, etc. of the type, size, and shape shown on the plans except that the maximum height of the base units of the structure shall be limited to 6 feet {2 m}, measured from the top of the bottom slab to the top of cover, grating, or lid. Structures of greater height will be measured as noted in Subarticle

RESETTING GRATINGS AND COVERS FOR CATCH BASINS, INLETS, AND MANHOLES 504

Where structures of greater height than the base units noted above are provided by the plans or ordered, measurement for the additional height will be in junction box units, inlet units, or manhole units of the particular type specified by the plans or proposal. Such units will be complete wall sections of the respective type structure measured in increments of 2 feet {600 mm} in height; ordered increments of less than 2 feet {600 mm} will be considered as a complete unit.

When Item 621-G is provided on the plans or proposal, the kind of inlet on which the grate will be used will be shown on the plans and the "Type" grate to be used will be designated on the plans and proposal. The accepted grates will be measured in individual units of each type ordered and accepted.

When Stilling Basins, Item 621-I, are provided on the plans or proposal, measurement will be as individual units including footings, bottom slab, walls, etc., of the type, size, and shape shown on the plans.

621.05Basis of Payment

will be paid for at the respective contract unit prices for each, which shall be payment in full for furnishing all materials including gratings, covers, and other fittings and for all form work, disposal of surplus material, and for all labor, equipment, tools, and incidentals necessary to complete the work.

provided above, will be paid for at the respective contract unit price for each type, complete in place, which shall be payment in full for furnishing all materials, for all form work, disposal of surplus materials, and for all labor, equipment, tools, and incidentals necessary to complete the work.

for at the respective unit price bid for each type specified. Said unit price shall be full compensation for the grate complete in place on the structure and includes furnishing of all materials, fabrication of the grate, installation of the grate, and for all equipment, tools, labor, and incidentals necessary to complete the work.

respective contract unit price for each type, complete in place, which shall be payment in full for furnishing all materials, for all form work, disposal of surplus materials, and for all labor, equipment, tools, and incidentals necessary to complete the work.

Excavation and backfill will be paid for as provided in Section 214.

621-A Junction Boxes, Type ____ - per each 621-B Junction Box Units, Type ____ - per each 621-C Inlets, Type ____ - per each 621-D Inlet Units, Type ____ - per each 621-E Manholes, Type ____ - per each 621-F Manhole Units, Type ____ - per each 621-G Inlet Grates, Type ____ - per each 621- I Stilling Basins, Type ____ - per each RESETTING GRATINGS AND COVERS FOR CATCH BASINS, INLETS, AND MANHOLES

622.01Description

This Section shall cover the work of raising or lowering the covers or gratings of existing inlets, catch basins, or manholes, all in accordance with plan details and these specifications at the locations shown on the plans or directed. CURB, GUTTER, AND COMBINATION CURB AND GUTTER 505

622.02Materials

All new materials used shall be in accordance with the requirements of Section 621, plan details, and Division 800, Materials.

622.03Construction Requirements

Heads, covers, and/or gratings of existing manholes, inlets, or catch basins that are raised, lowered, or moved in elevation without moving the structure proper will be considered reset. All work shall be done in a workmanlike manner by competent workmen and the unit re-established in proper working order at its new elevation. Any manhole, inlet, or catch basin heads, covers, gratings, or other material broken, destroyed, lost, or rendered unfit for reuse through carelessness, negligence, or improper handling of the work, shall be replaced by the Contractor without extra compensation. Concrete and brick masonry work shall conform to requirements of Sections 620 and 613, respectively. When adjustments to manholes, inlets, or catch basins require the removal of a portion of the existing facility, the Engineer will designate that portion of the structure to be removed. The removal of such is considered incidental to the work and the cost included in the unit price bid for the reset item. Should the Contractor remove any portions of the structure in excess of that directed by the Engineer, he shall restore the structure to the designated removal line without additional compensation.

622.04Method of Measurement

Manhole covers reset and gratings reset will be measured individually as one complete unit of the base height or less as provided by the plan details. Where adjustments to the manhole covers or gratings reset exceed the base unit height, measurement and payment for the excess height will be made as provided in Articles 621.04 and 621.05 for Manhole or Inlet Units.

622.05Basis of Payment

unit price for Manhole Covers Reset, which shall be payment in full for all material, equipment, tools, labor, and incidentals necessary to complete the work.

for Gratings Reset, which shall be payment in full for all material, equipment, tools, labor, and incidentals necessary to complete the work.

622-A Manhole Covers Reset - per each 622-B Gratings Reset - per each CURB, GUTTER, AND COMBINATION CURB AND GUTTER

623.01Description

This Section shall cover the work of constructing Portland cement concrete gutter, curb, or combination curb and gutter, constructed with or without metal reinforcement. All of which shall be constructed in accordance with the plan details and these specifications at the locations shown on the plans or established in conformity with the lines, grades, dimensions, and cross sections shown on the plans or designated.

623.02Materials

All materials shall conform to the requirements of Division 800, Materials. Concrete shall conform to the requirements of Section 501. Expansion joint filler shall be as specified in Section 832.

623.03Construction Requirements

Concrete mixes shall be provided by Section 501, with Class A concrete being used with standard forms and either a Class A or Class C concrete mix, modified as deemed necessary by the Testing Engineer, to fit the type curbing machine being used.