Article 1 — Description
Furnish, construct, and install safety end treatments for drainage structures, or install or replace pipe runners or pipe runner assemblies on existing drainage structures .
Article 2 — Materials
2.1 General . Furnish materials in accordance with the following.
Item 420, “Concrete Substructures” Item 421, “Hydraulic Cement Concrete” Item 432, “Riprap” Item 440, “Reinforcement for Concrete” Item 442, “Metal for Structures” Item 445, “Galvanizing” Item 460, “Corrugated Metal Pipe” Item 464, “Reinforced Concrete Pipe” Use Class C concrete for cast -in-place and precast concrete units unless otherwise shown on the plans. Furnish cast -in-place or precast safety end treatments unless otherwise shown on the plans. Furnish Class B concrete for concrete riprap unless otherwise shown on the plans. Provide galvanized steel for prefabricated metal end sections in accordance with Item 460. Furnish pipe runners in accordance with the following: ASTM A1085 ; ASTM A53, Type E or S, Grade B; ASTM A500, Grade B; or API 5L, Grade X42. Furnish plates and angles in accordance with ASTM A36. Furnish nuts and bolts in accordance with ASTM A307. Galvanize pipes, plates, angles, nuts, and bolts in accordance with Item 445.
2.2 Fabrication . Fabricate cast -in-place concrete units and precast units in accordance with Item 420. Provide
either prefabricated metal end sections or mitered corrugated metal pipe ( CMP ) when specified for the pipe structure unless otherwise shown on the plans. Provid e one of the following when reinforced concrete pipe (RCP) is specified for the pipe structure, unless otherwise shown on the plans: mitered RCP , or precast safety end treatment (SET) units. Provide riprap only if the plans specifically require it for this alternative.
2.2.1 SET Types .
2.2.1.1. Type I. Provide Type I SET consisting of reinforced concrete headwalls or wingwalls and pipe runners as shown on the plans when required. 731 2.2.1.2. Type II. Provide Type II SET as shown on the plans consisting of the following: CMP or RCP mi tered to the proper slope, concrete riprap, and pipe runners, when required; prefabricated metal end sections, concrete riprap, and pipe runners, when required; or precast SET units, concrete riprap, when required, and pipe runners, when required.
2.2.2 Lifting Holes . Provide no more than four lifting holes in each section for precast units. Lifting holes may be
cast, cut into fresh concrete after form removal, or drilled. Provide lifting holes large enough for adequate lifting devices based on the size and weight of the section. The maximum hole diameter is 3 in. at the inside surface of the wall and 4 in. at the outside surface. Cut no more than one longitudinal wire or two circumferential wires per layer of reinforcing steel when locating lift holes. Repair spalled areas around lifting holes.
2.2.3 Marking . Clearly mark the following on each precast unit, mitered CMP, mitered RCP, or metal end section
before shipment from the casting or fabrication yard: the date of manufacture, the name or trademark of the manufacturer, and the type and size designation.
2.2.4 Storage and Shipment . Store precast units on a level surface. Do not place any loads on precast units until
the design strength is reached. Do not ship units until design strength requirements have been met.
2.2.5 Causes for Rejection . Precast units may be rejected for not meeting any one of the specification
requirements. Individual units may also be rejected for fractures or cracks passing through the wall or surface defects indicating honeycombed or open texture surfaces. Remove rejected units from the project and replace with acceptable units meeting the requirements of this Item.
2.2.6 Defects and Repairs. Occasional imperfections in manufacture or accidental damage sustained during handling may be repaired in accordance with the Department’s Concrete Repair Manual . The repaired units
will be acceptable if they conform to the requirements of this Item and the repairs are sound and properly finished and cured in conformance with pertinent specifications. Repair damaged galvanizing in accordance with Section 445.3. 4., “Repairs.”
Article 3 — Construction
3.1 General . Remove portions of existing structures in accordance with Section 420.4.8., “Extending Existing
Substructures.” Drill, dowel, and grout in accordance with Item 420. Furnish concrete riprap in accordance with Item 432. Provide riprap on all prefabricated metal end sections.
3.2 Excavation, Shaping, Bedding, and Backfill . Excavate, shape, bed, and backfill in accordance with
Item 400, “Excavation and Backfill for Structures.” Take special precautions in placing and compacting the backfill to avoid any movement or damage to the units. Bed precast units on foundations of firm and stable material accurately shaped to conform to the bases of the units.
3.3 Placement of Precast Units. Provid e adequate means to lift and place the precast units. Fill lifting holes
with mortar or concrete and cure. Precast concrete or mortar plugs may be used.
3.4 Connections . Make connections to new or existing structures as shown on the plans. Furnish jointing
material in accordance with Item 464. Also remove a length of the existing pipe from the headwall to the joint when removing existing headwalls as shown on the plans or as approved. Re-lay the removed pipe if approved, or furnish and lay a length of new pipe. 732 3.5. Install or Replace Pipe Runners or Assemblies. Install or replace individual pipe runners or pipe runner assemblies on existing drainage structures as shown on the plans.
Article 4 — Measurement
SETs of all types will be measured by each barrel of each structure end. Pipe runners or pipe runner assemblies installed or replaced on existing structure will be measured by each installed or replaced on each structure end.
Article 5 — Payment
The work performed and materials furnished in accordance with this Item and measured as provided under “Measurement” will be paid for at the unit price bid for the various designations of “Safety End Treatment” specified as follows: “SET (Type I) (Barrel Span) (Wall Height) (Slope, Horizontal:Vertical) (Orientation, Cross or Parallel) ”; “SET (Type I) (Pipe Diameter or Design) (Slope, Horizontal:Vertical) (Orientation, Cross or Parallel) ”; “SET (Type II) (Pipe Diameter or Design) (Pipe Material) (Slope, Horizontal:Vertical) (Orientation, Cross or Parallel) ”; “SET (Pipe Runner)”; and “SET (Pipe Runner Assembly) .” For payment purposes, the wingwall heights of Type I SETs for box culverts will be rounded to the nearest foot. This price is full compensation for constructing, furnishing, transporting, and installing the end treatments; pipe runners, or pipe runner assemblies, connecting to existing structure; breaking back, removing and disposing of portions of the existing structure, removing and disposing of existng pipe runner or pipe runner assemblies, and replacing portions of the existing structure as required to make connections; excavation and backfill; furnishing concrete, reinforcing steel, CMP or RCP , and pipe runners; and concrete riprap, nuts, bolts, plates, angles, equipment, labor, tools, and incidentals. The removal and re- laying of existing pipe or the furnishing of new pipe to replace existing pipe will not be paid for directly , but will be subsidiary to this Item. The mitered length of CMP or RCP that is a part of the SET (Type II) will not be paid for directly , but will be subsidiary to this Item. The limits for payment for pipe will be as shown on the plans and paid for in accordance with the pertinent bid item. The limits of riprap to be included in the unit price bid for each SET will be shown on the plans. Any riprap placed beyond the limits shown will be paid for in accordance with Item 432. Riprap between multiple precast SET units will be required as shown on the plans and is included in the unit price bid for SET. When precast SETs are provided as an option to mitered RCP, riprap aprons will not be required unless shown on the plans. The plans will show the limits of the riprap to be included with the precast SET for payment .