Attachment D.pdf

719.1 719.2.5

SECTION 719

CATCH BASINS, DROP INLETS, MANHOLES,

JUNCTION BOXES, AND SPRING BOXES

719.1

719.1 Description

719.1 This section contains specifications for the materials, equipment, construc-tion, measurement, and payment for the construction or adjustment to grade of catch basins, drop inlets, manholes, junction boxes, and spring boxes at the location shown on the Plans or as directed by the RCE, in accordance with these specifications, and in conformity with the lines and grades shown on the Plans or established by the RCE.

719.2

719.2 Materials

719.2.1

719.2.1 Cast-In-Place Concrete

719.2.1 Unless otherwise specified on the Plans or in the Special Provisions, pro-vide Class 4000 for cast-in-place concrete conforming to the requirements of applicable subsections of Section 701

719.2.2

719.2.2 Clay or Shale Brick

719.2.2 Provide clay or shale brick conforming to the requirements of Subsection 718.2.1.

719.2.3

719.2.3 Concrete Brick

719.2.3 Provide concrete brick and similar solid units conforming to the require-ments of Subsection 718.2.2.

719.2.4

719.2.4 Mortar Materials

719.2.4 Provide mortar materials conforming to the requirements of Subsection 718.2.5.

719.2.5

719.2.5 Castings

719.2.5 Provide iron castings for frames, grates, covers, etc., conforming to the re-quirements of AASHTO M 105, Class 35B, and the alternate load test con-forming to the requirements of AASHTO M 306.

719.2.5 Produce castings in closed molds and boldly filleted at angles. Ensure that the arises are sharp and perfect and make certain that they are true to pattern in form and dimensions, free from pouring defects, sponginess, cracks, blow holes, and other defects affecting their strength and value for the service in-tended. Ensure that the castings are clean and neatly finished. Make certain gratings and covers fit firmly into their respective frames.

719.2.5 Steel grates and frame may be used instead of cast iron as long as the loading and hydraulic requirements are met and they conform to the following:

A. Hot dip zinc coat steel grates and frame in accordance with AASHTO

M 111.

719.2.5 719.2.9.1

B. Dimension steel grates and frame to be interchangeable with each piece of the cast iron grate and frame shown on the Plans.

C. Provide steel grates and frames of sufficient strength to meet or ex-ceed the loading requirements of Federal Specification RR-F-621 (latest edition).

719.2.5 Ensure that the manufacturer has a testing program to verify that the cast-ings comply with the strength requirements of AASHTO M 105. Make certain test bars are Type B and are made and tested in accordance with the re-quirements of AASHTO M 105.

719.2.6

719.2.6 Reinforcing Steel

719.2.6 Furnish reinforcing steel conforming to the requirements of ASTM A 706, Grade 60, and meeting the applicable requirements of Section 703.

719.2.7

719.2.7 Structural Steel

719.2.7 Provide structural steel conforming to the requirements of AASHTO M 270, Grade 36.

719.2.8

719.2.8 Steel Tubular Sections

719.2.8 Provide steel tubular sections conforming to the requirements of ASTM A 53, Schedule 80.

719.2.9

719.2.9 Precast Reinforced Concrete Drainage Structures

719.2.9.1

719.2.9.1 General

719.2.9.1 Subject to the approval of the RCE, precast reinforced concrete drainage structures may be substituted for constructed-in-place structures shown on the Plans. If precast structures are specified on the project, or if permission is given to substitute precast alternates, ensure that they conform to the details shown on the Plans and the applicable provisions of this specification. De-sign precast concrete drainage structures for HS-25 loading. Use Class 4000P Portland cement concrete conforming to the applicable requirements of Section 701. Use reinforcing steel that conforms to ASTM A 706, Grade 60, and is from a source listed on the most recent edition of SCDOT Qualified Product List 60. Use wire mesh that conforms to the requirements of AASHTO M 55 and AASHTO M 221.

719.2.9.1 Supply components of precast concrete drainage structures from a single source precast manufacturer. Have the manufacturer inform the OMR of the planned concrete placement and curing schedule in advance of the start of any fabrication work to afford time for the testing of materials, the inspection of equipment, and the review of the procedures for casting the units. Allow the OMR inspector free access to the fabrication plant at all times for the pur-pose of inspecting materials, plant facilities, and fabrication and curing proce-dures.

719.2.9.2 719.4.3

719.2.9.2

719.2.9.2 Precast Drainage Base

719.2.9.2 Have drainage bases manufactured to the sizes shown on the Plans and in accordance with the applicable requirements of AASHTO M 199. Ensure that drainage bases are manufactured with all required openings to accept all pre-scribed inlet and outlet pipes.

719.2.9.3

719.2.9.3 Precast Concrete Transition Section

719.2.9.3 A precast concrete transition section may be used to transition from a lar-ger diameter riser to a smaller diameter riser. Use transition sections that are either a cone shape or a flat slab as specified on the Plans. Ensure that they are manufactured in accordance with the requirements of AASHTO M 199.

719.2.9.4

719.2.9.4 Precast Concrete Risers

719.2.9.4 Have risers manufactured to the diameters and lengths shown on the Plans and in accordance with the requirements of AASHTO M 199. Place risers plum and backfill in a manner that preserves their alignment.

719.2.9.5

719.2.9.5 Flat Slab Adapter

719.2.9.5 Use flat slab adapters to change round precast concrete risers to rectangu-lar openings to facilitate construction of the prescribed catch basins or drop inlets to grade. Use the flat slab adapters as foundations for the necessary courses of brick. Flat slab adapters are not required for manholes. Use a flat slab top with an eccentric 24-inch diameter hole on top of the manhole riser when the casting is placed directly thereon, and as shown on the Plans. Do not allow the distance from the top of the adapter to the top of the cover or casting to be more than 6 feet.

719.3

719.3 Equipment

719.3 Ensure that the equipment necessary for the proper construction of the work is on site, in acceptable working condition, and approved by the RCE as to both type and condition before the start of work under this section. Provide sufficient equipment to enable prosecution of the work in accordance with the project schedule and completion of the work in the specified time.

719.4

719.4 Construction

719.4.1

719.4.1 Excavation

719.4.1 Excavate to the required depth and compact the material on which the ma-sonry is constructed to a firm even surface.

719.4.2

719.4.2 Brick Masonry

719.4.2 Construct brick masonry in accordance with the applicable requirements of Section 718.

719.4.3

719.4.3 Reinforced Concrete

719.4.3 Construct reinforced concrete in accordance with applicable requirements of Sections 701, 702, and 703. Provide and place reinforcing steel, if re-

719.4.4 719.4.7 quired, in position as shown on the Plans and hold securely in place.

719.4.4

719.4.4 Placing Pipe

719.4.4 Incorporate inlet and outlet pipes into the structure at the elevation, direc-tion, and grade required. Neatly and substantially hold these pipe connec-tions in the masonry. Place the ends of the pipe flush with the inner faces of the walls unless the RCE directs otherwise. Place grout up to the lowest flow elevation in the structure to maintain continuous flow. For grout, use Type M mortar material in accordance with applicable requirements of Section 718.

719.4.5

719.4.5 Placing Castings

719.4.5 Set the castings in a full mortar bed composed of 1 part Portland cement to 2 parts of fine aggregate, meeting the requirements of Subsection 718.2.5 and 718.4.1.

719.4.6

719.4.6 Precast Concrete Drainage Structures

719.4.6 Fabricate and install precast concrete drainage structures in accordance with these specifications and applicable AASHTO specifications. Have the manufacturer of precast components provide recommendations for all field connections of precast sections and piping.

719.4.6 Provide the proper bedding for precast concrete drainage structures to en-sure proper installation and elimination of point bearing. Provide bedding of sand, gravel, or crushed stone. Include cost of bedding in the cost of the re-spective drainage items.

719.4.6 Seal joints with a butyl rubber joint sealant meeting the requirements of

Section 714 and AASHTO M 198, Type B. Apply the sealant in accordance with the manufacturer’s recommendations. Supply a copy of the recommen-dations to the RCE.

719.4.7

719.4.7 Grade Adjustment of Existing Structure

719.4.7 When grade adjustment of existing structure is required, remove the frames, covers, and gratings and reconstruct the walls as required. Perform the work using salvaged materials when practicable. Furnish new materials as necessary to complete the adjustment.

719.4.7 Adjust the existing structures to the required grade and elevation by care-fully removing the grating, removing or adding masonry below or above the existing masonry, and replacing the casting on a full mortar bed to the new elevation.

719.4.7 Where the pavement consists of an asphaltic mix or mixes and unless oth-erwise permitted or directed, adjust the casting to grade after the last base or binder course has been laid and before placing the surface course. Where the pavement, base, or subgrade is removed from around the structure to make the adjustment, fill the area with concrete before placing the surface course.

719.4.8 719.6

719.4.8

719.4.8 Backfilling

719.4.8 Backfill the excavated areas not occupied by the structure with suitable ma-terial placed and thoroughly compacted in layers not more than 8 inches.

719.5

719.5 Measurement

719.5 The quantity for new or adjusted cast-in-place, brick, or block masonry drainage structure is measured by each (EA) unit complete in place and ac-cepted, and includes all frames, covers, gratings, and fittings necessary to complete the unit.

719.5 When the depth of a catch basin, drop inlet, manhole, junction box, or spring box is greater than 6 feet, the quantity for the pay item Extra Depth of Box is the depth of excavation for the drainage structure in excess of 6 feet and is measured by the linear foot (LF), complete, and accepted. The depth of the drainage structure is measured from the top of manhole cover, concrete masonry, hood, or grate and, in the case of drop inlets, from the top of the bottom slab.

719.5 The quantity for precast drainage structure components is measured by the linear foot (LF) or each (EA) unit in place, complete and accepted and in-cludes all frames, covers, gratings, and fittings necessary to complete the unit. Extra Depth of Box is not measured for precast drainage structures.

The lay length of a precast transition section is not included in the measure-ment for the precast concrete drainage structure to which it is connected.

719.5 The excavation required for the installation of drainage structures includes the removal of all obstructions and the removal and replacement of unstable materials as necessary for a proper foundation, but such excavation is not measured nor paid for as a separate item. The cost of excavation is included in the contract unit bid price for the associated drainage structure.

719.6

719.6 Payment

719.6 Payment for the accepted quantity for a new or adjusted drainage struc-tures, measured in accordance with Subsection 719.5, is determined using the contract unit bid price for such items as Catch Basin, Drop Inlet, Manhole, Junction Box, Spring Box, or Adjust Catch Basin, Drop Inlet, Manhole, Junc-tion Box, Utility Box of the size and type specified, or the respective precast concrete drainage structures, Precast Concrete Riser, PC Drainage Base, PC Transition Section (Flat Slab) PC Transition Section (Cone) of the size speci-fied. Payment is full compensation for constructing drainage structures as specified or directed and includes furnishing and placing precast and cast-in-place drainage structure; furnishing and placing reinforcing steel, bricks, blocks, and mortar for masonry structures; providing inlet and outlet openings and joint sealant; excavating (6 foot maximum depth); providing and placing bedding material and backfilling; disposing of surplus material; and all other materials, labor, equipment, tools, supplies, transportation, and incidentals necessary to fulfill the requirements of the pay item in accordance with the Plans, the Specifications, and other terms of the Contract

719.6 719.6

719.6 Payment for drainage structures is made in accordance with the following schedule:

719.6

Drainage Structure Pay Schedule

Structure Brickwork Complete

Throat/Pad Complete

Lid/Grate Complete

Type 1 90% --- 10%

Type 9 90% --- 10%

Type 9 Manhole 90% --- 10%

Type 12 80% 10% 10%

Manhole 90% --- 10%

Type 14 and 14 MG 80% 10% 10%

Type 15 90% --- 10%

Drop Inlet 90% --- 10%

Spring Box 90% --- 10%

Type 16 70% 10% 20%

Type 17 70% 10% 20%

Type 18 70% 10% 20%

719.6 Payment for the accepted quantity of Extra Depth of Box, measured in ac-cordance with Subsection 719.5, is determined using the contract unit bid price for the pay item. Payment is full compensation for excavating for drain-age structures beyond the 6 feet included in the structure pay item as speci-fied or directed and includes backfilling and all other materials, labor, equip-ment, tools, supplies, transportation, and incidentals necessary to fulfill the requirements of the pay item in accordance with the Plans, the Specifications, and other terms of the Contract. Extra Depth of Box is not applicable to pre-cast drainage structures.

719.6 Making connection with an existing culvert or drain including joint sealant, drainage openings, excavation, bedding material, backfilling, disposal of sur-plus material, replacing pavement, reinforcing steel, bricks, mortar and other miscellaneous items needed to complete the work is not paid for separately, and the cost thereof is included in the contract unit bid price for the pay item that requires the work.

719.6 Payment for each item includes all direct and indirect costs and expenses necessary to complete the work.

719.6 719.6

719.6 Pay items under this section include the following:

719.6

Item No. Pay Item Unit

7191XXX Catch Basin (type) EA

71920XX Drop Inlet (size) EA

7192105 Manhole EA

71922XX (size) Junction Box EA

7192300 Spring Box EA

71930XX Precast Concrete Riser - (size)" Diameter LF

71931XX PC Drainage Base - (size)" Diameter EA

71931XX PC Transition Section (Flat Slab) - (size)" to (size)" EA

719317X PC Transition Section (Cone) - (size)" to (size)" EA

7196000 Extra Depth of Box LF

7197110 Adjust Catch Basin EA

7197120 Adjust Manhole EA

7197130 Adjust Drop Inlet EA

7197140 Adjust Utility Box EA

7197150 Adjust Junction Box EA