271 SECTION 606
606.01 Description
This work consists of furnishing required materials as well as fabricating, transporting, and installing Precast Reinforced Concrete Box Culverts (PRCB).
606.02 Equipment
Reserved.
606.03 Materials
A.General. Item Section Steel Strand, Uncoated Seven -Wire for Concrete Reinforcement 836.03 E Geosynthetic 858
B.Waterproof Membrane. Provide self- adhesive black polyethylene membrane that meets the following requirements: - Has sheeting with a minimum thickness of 0.004 inch; and - Has rubberized asphalt coating with a minimum thickness of 0.056 inch.
606.04 Construction Requirements
A.Design and Manufacture. Design and manufacture the PRCB as specified in the applicable portions of AASHTO LRFD Bridge Design Specifications, Section 12, and AASHTO Materials Specification M 259. Use an ACPA or NPCA certified plant in the construction.
B.Concrete. Use concrete that will achieve a minimum compressive strength of 3,000 psi after 28 days. Use a mix design having a minimum cement content of six sacks per cubic yard.
C.Barrels. Use barrel sections that are a minimum of 4 feet long measured along the shortest side. Construct the sections with a minimum concrete thickness of 8 inches. Do not allow any haunch or fillet at the inside corners of the barrel to exceed a triangular shape with 12 inch horizontal and 12 inch vertical legs. Use tongue and groove section joints in which the tongue is a mi nimum of 4 inches long and 3.5 inches thick at the end of the tongue.
D.Work Drawings. Submit work drawings containing the following information: − Layout showing PRCB placement; − Type and strength of concrete and reinforcing steel; − All concrete and reinforcing dimensions; − Reinforcing steel clearances; − Method of tying sections together; 272 − Method of covering the joints; and − Installation and handling instructions. Notify the Engineer of the date and location of fabrication at least 10 working days before fabrication begins. Provide design calculations and work drawings that are signed, sealed, and dated by a Professional Engineer registered in the State of North Dakota as set forth in NDCC Title 43. Do not fabricate material before the Department has res ponded to a set of work drawings with “No Exceptions Noted”.
E.Installation.
1.Bedding. Provide a 2 inch minimum thickness of uncompacted and screedable sand material under the PRCB for a leveling course.
2.Laying Culvert. Begin laying PRCB from the downstream end, with the bell end pointing upstream. Adjust grade without applying external force on the culvert. If a culvert section is not on grade after joining, completely remove the section. Regrade the bedding material to proper grade and reset the section. Maintain the correct grade throughout the culvert.
3.Joints. Install the barrel sections so that joints between sections fit as tight as possible, with a maximum gap of 3/4 inch wide. Connect each section using the approved ties before setting the next section. Provide watertight joints on the floor , on the exterior walls , and roof using a preformed mastic meeting ASTM C 990. Use a waterproof membrane that is a minimum of 24 inches wide. Prepare the walls and roof exterior surface of the joint according to the waterproof membrane manufacturer’s recommendation. Roll the membrane to the surface keeping it free of wrinkles and bubbles. Lap waterproof membrane joints a minimum of 2.5 inches. Seal the joints and exposed edges with a joint sealing mastic recommended by the manufacturer of the membrane.
606.05 Method of Measurement
The Engineer will measure, completed and in place, as specified in Section 109.01, “Measurement of Quantities”. 273 606.06 BASIS OF PAYMENT Pay Item Pay Unit ___ FT X ___ FT Precast RCB Culvert Linear Foot DBL ___ FT X ___ FT Precast RCB Culvert Linear Foot ___ FT X ___ FT Precast RCB End Section Each DBL ___ FT X ___ FT Precast RCB End Section Each Such payment is full compensation for furnishing all materials, equipment, labor, and incidentals to complete the work as specified. Section 612 274 SECTION 612 REINFORCING STEEL
612.01 Description
This work consists of furnishing and placing reinforcing steel.
612.02 Equipment
Reserved.
612.03 Materials
Item Section Reinforcing Steel, Dowel Bars, and Tie Bars 836 Fabricate reinforcing steel in accordance with CRSI’s Manual of Standard Practice. Furnish reinforcing steel in the full length specified without using splices.
612.04 Construction Requirements
A.Bar List. Add a prefix to all bar designations to differentiate between the different structures on the same project.
B.Storage of Reinforcing Steel. Do not store reinforcing steel in direct contact with the ground. Incorporate reinforcement into the work only if it is free of deleterious material and detrimental scale or rust.
C.Field Bending. Do not field bend bars, unless specified. If field bending is specified, bend reinforcing bars cold.
D.Placing and Tying. Provide the Engineer 24 hours to inspect reinforcing steel before concrete placement. Tie bars at intersections unless the spacing is l ess than 12 inches in any direction, then only tie alternate intersections. Use 16 gauge non-corrosive wire ties. Do not weld, flame cut, or heat bars. Tie the top layer of transverse deck slab reinforcing steel to the shear connectors at each beam/girder line with two wraps of 16 gauge non-corrosive wire ties at a maximum longitudinal spacing of 6 feet. Anchor the top layer of transverse approach slab reinforcing steel to the ground using steel stakes at a maximum spacing of 7 feet in the longitudinal and transverse directions. Use bar supports that are made of plastic or metal. Use corrosion-proof legs if metal bar supports rest on the forms. Place bol sters and bar supports for deck slabs , approach slabs, and box culvert roof slabs at a maximum of 4 foot spacing.
Source: North Dakota Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 306–308 of 550.