901Cement Concrete.

201.60 : General

Basins, manholes and inlets shall be built to the lines, grades, dimensions and design shown on the plans and as directed with the necessary frames, gratings, covers, hoods, etc., and in accordance with these specifications. Basins and inlet grates other t han Cascade type may be Type A -1 or A -3, but only one type may be used throughout the project. Sanitary Sewer Manholes shall be constructed according to the specifications of the Municipality as designated in the Contract. 201.61: Excavation Excavation shall conform to the applicable portions of Subsection 140: Excavation for Structures . 201.62: Laying Brick and Blocks Brick and concrete blocks shall be soaked in water before laying. All joints in brick structures shall be thoroughly flushed full of mortar and no joint on the inside face shall be greater than ⅛ in. After Massachusetts Department of Transportation – Highway Division Standard Specifications for Highways and Bridges II.55 202 4 Edition the bricks are laid, the joints shall be pointed on the outside. As brick walls are laid up, the outside of the structure shall be plastered with ½-in. thick mortar coat. As circular concrete block walls are laid- up the horizontal joints and keyways shall be flushed full with mortar. As rectangular blocks are laid up all horizontal and vertical joints shall be flushed full with mortar. Plastering of the outside of block structures will not be required. The joints in precast units shall be wetted and complet ely mortared immediately prior to settling a section. No structure shall be backfilled until all mortar has completely set. When the floors of structures are made of concrete sectional plates the opening in the floor shall be filled with brick chips and mo rtar, cement concrete, or left open, as directed. 201.63: Placing Castings Frame castings for basins, manholes and inlets shall be set in full mortar beds true to the lines and grades as directed. Where directed the castings shall be temporarily set at such grades as to provide drainage during the construction. The castings of structures located within the pavement area shall not be completely set to the established grade until the bottom course of pavement has been laid. The final setting of all other castings shall be performed at the proper stage of construction as directed. Cement concrete collars shall be placed around the castings after the final setting as shown on the plans and as directed. Hoods shall be installed in catch basins only when required by Special Provisions. 201.64: Weep Holes Two weep holes shall be built into the walls of all new basins, precast units and in Types C, CF, D and DF drop inlets as shown on the plans. Each weep hole shall consist of a section of 4 -in. pipe or equivalent opening to carry water through the wall of the structure. The ends of the pipe, if used, shall be saw cut and left flush with the walls of the structure. The outside end of the pipe or opening shall be covered with a ¼-in. mesh galvanized wire screen 23 gauge satisfactorily fastened against the wall. The drain to the weep hole shall be excavated and backfilled with 2 ft ³ crushed stone conforming to Section M2: Aggregates and Related Materials . The stone shall be placed against and over the end of the pipe or opening to prevent the entrance of the finer filling material. Only one type of weep hole shall be used throughout the project.

201.65 : Backfilling

Backfilling requirements shall conform to the Provisions of 120.60: General, Paragraph B, 150.60: General, and 150.64: Backfilling for Structures and Pipes . Massachusetts Department of Transportation – Highway Division Standard Specifications for Highways and Bridges II.56 202 4 Edition COMPENSATION 201 .80: Method of Measurement Measurement for catch basins, leaching basins, manholes and drop inlets (Types C and D), will be based on a standard unit having a depth of 6 .5 ft; for drop inlets (Types A and B) having a depth of 4 ft-10 in ., as measured vertically at the center of the structure from the top of the grating or cover to the top of the floor in the case of basins and inlets and the invert in the case of manholes. When the measured depth exceeds the standard unit, the number of u nits paid for will be in the proportion of the measured depth to the standard depth down to 9 ft. Basins, manholes, or drop inlets having a depth less than this standard unit will be counted as o ne unit. Each gutter inlet shall be counted as one unit. Measurement for manholes more than 9 ft down to a depth of 14 ft will be based on a standard unit depth of 9 ft as measured vertically at the center of the structure from the top of the cover to the invert. Measurement for manholes more than 14 ft down to a depth of 18 ft will be based on a standard unit depth of 14 ft as measured vertically at the center of the structure from the top of the cover to the invert. When items for Manholes (9 to 14 ft Depth) or Manholes (14 to 18 ft Depth) do not appear in the Proposal the standard unit of depth for all structures shall be 6.5 ft. Special manholes will be measured as complete units regardless of depth. Frames and grates or covers will be measured by each complete unit furnished and delivered to the site. 201.81: Basis of Payment The accepted quantities of manholes, inlets and basins will be paid for at the contract unit price each, complete in place, which shall include crushed stone for weep holes and installation of the frame and grate or cover. Payment for the concrete collars shall be included in the contract unit price of the structure involved. Extra depth excavation below the proposed bottom of structure to obtain a stable foundation will be paid for as Class B Trench Excavation. When directed, the castings of drainage structures on roadways opened to traffic will be set to a temporary grade, and the unit will be considered complete in place and paid for at the contract unit price for the type of structure involved. At such time as the casting or structure and casting is adjusted to final grade the work shall be done and payment made under the provisions of Sub

Cement Concrete. in other states

• Louisiana 901 · Portland Cement Concrete