The Table of Contents for this section is available.
The work covered by this section consists of the construction of cast-in-place concrete, brick masonry, block masonry, or precast concrete inlets, catch basins, junction boxes, spring boxes, manholes, concrete aprons, and other minor drainage structures excluding endwalls, together with all necessary metal grates, covers, frames, steps, and other hardware, in accordance with the requirements shown on the plans and the provisions of these specifications.
The Contractor may, at his option, use either cast-in place concrete, brick masonry, block masonry, or precast concrete construction, provided that the type of construction he wishes to use is permitted by the plans.
All materials shall meet the requirements of Division 10 shown below:
Portland cement concrete Section 1000
Curing agents Section 1026
Joint fillers Article 1028-1
Joint sealers Article 1028-2
Brick Article 1040-1
Concrete block Article 1040-2
Mortar Article 1040-8
Precast drainage structure units Section 1077
Reinforcing steel Section 1070
Structural steel Section 1072
Steps Article 1074-7
Fabricated steel grates Article 1074-8
Gray iron castings Article 1074-6
Stone, No. 78M Section 1005
Grout used in precast structures shall meet the requirements of Article 10409 except that the mixture shall consist of 1 part portland cement to 2 parts of mortar sand.
Bedding material for use under precast foundation slabs shall consist of a suitable clean granular material.
(A) Foundation:
No masonry drainage structure shall be placed until the foundation has been approved by the Engineer.
Where the foundation material is found to be of poor supporting value or of rock, the Engineer may make minor adjustment in the location of the structure to provide a more suitable foundation. Where this is not practical, the foundation shall be conditioned by removing the existing foundation material by undercutting to the depth as directed by the Engineer and backfilling with either a suitable local material secured from unclassified excavation or borrow excavation at the nearest accessible location along the project, or foundation conditioning material consisting of crushed stone or gravel or a combination of sand and crushed stone or gravel approved by the Engineer as being suitable for the purpose intended. The selection of the type of backfill material to be used for foundation conditioning will be made by the Engineer.
Where precast foundation slabs are used, the slab shall be set to within plus or minus 1/2 inch of grade on a bed of compacted bedding material which is from 2 to 3 inches thick.
(B) Cast-In-Place Concrete, Brick, and Block Masonry:
Concrete shall be constructed in accordance with Section 825 and shall be given an ordinary surface finish. Brick masonry shall be constructed in accordance with Section 830. Furnishing and placing reinforcing steel shall be in accordance with Section 425. Block masonry shall be constructed in accordance with Section 834 except that reinforcing will not be required.
All concrete shall be Class B concrete unless otherwise indicated on the plans.
Where necessary to fit field conditions, the dimensions of the structure and footings shall be varied as directed by the Engineer.
(C) Installation of Precast Units:
The precast drainage structure units shall be assembled in accordance with the manufacture's instructions and grouted together to form a sound structural unit. Where it is necessary to use cast-in-place concrete, brick masonry, or block masonry construction as part of the structure, the requirements of Subarticle 8403(B) shall apply to such construction.
Where necessary to fit field conditions, the dimensions of the structure and footings shall be varied as directed by the Engineer.
(D) Fittings and Connections:
Where fittings enter the structure, they shall be placed as the work is built up, thoroughly bonded, and accurately spaced and aligned.
Pipe connections shall be made so that the pipe does not project beyond the inside wall of the drainage structure, and shall be grouted as necessary to make smooth and uniform surfaces on the inside of the structure.
Metal frames for grates and covers shall be set in full mortar beds or secured by methods approved by the Engineer.
(E) Backfill:
After the structure has been completed, and all forms, falsework, sheetings, and bracing have been removed, the excavation shall be backfilled with approved material compacted to the density required by Subarticle 2354(C). Backfilling shall not be done until the concrete or brick masonry has cured for at least 7 curing days, unless otherwise permitted by the Engineer. A curing day shall be as defined in Article 8259 for concrete or Article 8305 for brick or block masonry.
(F) Pipe Collars and Pipe Plugs:
Pipe collars and pipe plugs shall be constructed in accordance with the details shown on the plans or as directed by the Engineer.
Portland cement concrete for pipe collars may be any class of portland cement concrete covered by Section 1000.
The Contractor may construct pipe plugs with either brick masonry or any class of portland cement concrete covered by Section 1000.
(G) Concrete Aprons:
Concrete aprons shall be constructed in accordance with the details in the plans and as directed by the Engineer. Concrete shall be Class "B" or higher Compressive Strength.
(A) Masonry Drainage Structures:
(1) Per Each Basis:
Any drainage structure which incorporates an opening for circular pipe not exceeding 48 inches in diameter will be measured and paid for on a "per each" basis as provided below.
The quantity of masonry drainage structures to be paid for will be actual number of drainage structures which have been completed and accepted.
In addition, that portion of a drainage structure exceeding a height of 5.0 feet will be measured and paid for on a linear foot basis. The quantity of masonry drainage structures above a height of 5.0 feet to be paid for will be the number of linear feet which the height of the drainage structure exceeds 5.0 feet. The height will be measured vertically to the nearest tenth of a foot from the top of the bottom slab to the top of the wall.
(2) Volume Basis:
Any masonry drainage structure which incorporates an opening for circular pipe exceeding 48 inches in diameter, or for pipe arch of any size, will be measured and paid for on a volume basis as provided below.
The quantity of masonry to be paid for will be the number of cubic yards of cast-in-place concrete, brick, block, or precast masonry which has been incorporated into the completed and accepted structure. This quantity will be computed from the dimensions shown on the plans or from revised dimensions authorized by the Engineer. Where wall thicknesses are greater than the wall thicknesses shown on the plans due to the use of oversize brick or for any other reason, the wall thickness shown on the plans will be used to compute quantities except where an increase in wall thickness has been authorized by the Engineer.
(B) Pipe Collars and Pipe Plugs:
The quantity of pipe collars and pipe plugs to be paid for will be the number of cubic yards of concrete or brick which has been incorporated into the completed and accepted pipe collar or pipe plug. The number of cubic yards of pipe collars and pipe plugs will be computed from the dimensions shown on the plans or from revised dimensions authorized by the Engineer.
(C) Frame Assemblies with Grates or Covers:
The quantity of assemblies to be paid for will be the actual number of assemblies which have been incorporated into the completed work. No separate measurement will be made of grates, hoods, and covers which are part of the assembly as the grates, hoods, and covers will be considered to be part of the complete assembly.
The quantity of fabricated steel grates to be paid for will be the actual number of fabricated steel grates which have been incorporated into the completed work.
(D) Concrete Aprons:
The quantity of concrete aprons, constructed in curbing or islands, to be paid for will be the actual number completed and accepted.
(A) Masonry Drainage Structures:
(1) Per Each Basis:
Any masonry drainage structure which incorporates an opening for circular pipe not exceeding 48 inches in diameter will be paid for on a "per each" basis as provided below.
The quantity of masonry drainage structures, measured as provided in Subarticle 8404(A)(1), will be paid for at the contract unit price each for "Masonry Drainage Structures."
In addition, the quantity of masonry drainage structures, measured as provided in Subarticle 8404(A)(1), will be paid for at the contract unit price per linear foot for "Masonry Drainage Structures" for that portion of the drainage structure from a height of 5.1 feet to 10.0 feet. For that portion of the drainage structure above a height of 10.0 feet, payment will be made at 1.3 times the contract unit price per linear foot for "Masonry Drainage Structures".
(2) Volume Basis:
Any masonry drainage structure which incorporates an opening for circular pipe exceeding 48 inches in diameter, or for pipe arch of any size will be paid for on a volume basis as provided below.
The quantity of masonry, measured as provided in Subarticle 8404(A)(2), will be paid for at the contract unit price per cubic yard for "Masonry Drainage Structures".
(B) Pipe Collars and Pipe Plugs:
The quantity of concrete or brick, measured as provided in Subarticle 8404(B), will be paid for at the contract unit prices per cubic yard for "Pipe Collars" and "Pipe Plugs".
(C) Foundation Conditioning:
Foundation conditioning will be paid for as provided in Subarticles 3009(A) and 3009(E).
(D) Frame Assemblies with Grates and Covers:
The quantity of assemblies, measured as provided in Subarticle 8404(C), will be paid for at the contract unit price each for "Frame with Grate and Hood, Std.____________," "Frame with Grate, Std.__________""Frame with Two Grates, Std.____________," "Frame with Cover, Std.____________", "Heavy Duty Frame with Grate", and "Heavy Duty Frame with Two Grates".
The quantity of fabricated steel grates, measured as provided in Subarticle 8404(C), will be paid for at the contract unit price each for "Fabricated Steel Grates, Std.__________".
(E) Concrete Aprons:
The quantity of concrete aprons, measured as provided for in Subarticle 8404(D) will be paid for at the contract unit price each for "Concrete Apron for Catch Basins" and "Concrete Apron for Drop Inlets."
(F) Compensation:
The above prices and payments will be full compensation for all work covered by this section, including but not limited to excavation; hauling; disposal of materials; removing existing pipe and drainage structures at the site of the work; furnishing, transporting, and placing bedding material, backfill material, subsurface drainage, concrete, brick masonry, block masonry, precast units, mortar, grout, reinforcing steel, hardware, castings, and miscellaneous metal; fabrication; welding; and galvanizing.
(G) Pay Items:
Payment will be made under:
Masonry Drainage Structures Each
Masonry Drainage Structures Linear Foot
Masonry Drainage Structures Cubic Yard
Pipe Collars Cubic Yard
Pipe Plugs Cubic Yard
Frame with Grate and Hood, Std.___________ Each
Frame with Grate, Std._________ Each
Frame with Two Grates, Std.________ Each
Frame with Cover, Std.__________ Each
Fabricated Steel Grates, Std.________ Each
Heavy Duty Frame with Grate Each
Heavy Duty Frame with Two Grates Each
Concrete Apron for Catch Basins Each
Concrete Apron for Drop Inlets Each