- 872 - SECTION 1036 -- METAL FLARED-END SECTIONS
1036.01 Description
1.Flared-end sections for corrugated metal pipe shall be zinc-coated (galvanized) steel or aluminum-coated steel.
1036.02 Material Characteristics
1.Material used in the manufacturing of flared-end sections shall conform to the applicable requirem ents of AASHTO M 36 or ASTM A 929.
2.Metal flared-end sections shall be of the design shown on the contract.
3.Bolts, nuts, washers and al l other hardware items used with coupling bands sha ll be galvanized in accordance with AASHTO M 232 (ASTM A 153) or mechanically galvanized in accordance with AASHTO M 298 (ASTM B 695) Class 50.
4.In the repair of damaged coati ng on flared-end sections which are fabricated by methods which damage their coating, both the interior and exterior surfaces of the damaged area shall be thoroughly cleaned and all traces of welding flux and weld spatter shall be removed. The cleaned area shall then be painted with zinc-rich paint at the fabricating plant, in accor- dance with Section 1061.
5.The mass of metallic coating may be determined by the use of magnetic thickness gages in accordance with ASTM E 376. In cases of dispute, additional samples shall be tested in accordance with AASHTO T 65 or AASHTO T 213, as applicable.
6.Unless otherwise specified in the contract, the minimum sheet thickness for fabricating metal flared-end sections shall be as follows: Table 1036.01 Nominal Diamete r Inches (mm) Sheet Thickness Inches (mm) 12 thru 24 (300-600) 0.057 (1.45) 30 thru 36 (760-900) 0.072 (1.83) 42 thru 84 (1060-2100) 0.101 (2.57)
7.Coupling or connecting bands with projections (often referred to as dimple bands) are not acceptable.
1036.03 Acceptance Requirements
1.Metal flared-end sections will be accepted based on the requirements of this section and sa mpling and testing requirements as described in the Department’s Materials Sampling Guide . - 873 - SECTION 1037 -- REINFORCED CONCRETE PIPE, MANHOLE RISERS, AND FLARED-END SECTIONS
1037.01 Description
1.This Specification pr ovides the Department’s criteria for Reinforced Concrete Pipe (Round, Elliptical, Pipe-Arch), Reinforced Concrete Manhole Risers, and Concrete Flared-End Sections.
1037.02 Material Characteristics
1.Aggregates shall conform to t he requirements of Section 1033 with the exceptions that t he requirements for gradation and calcium carbonate content are waived.
2.Each flared-end or pipe section shall have all AASHTO required markings indented, scribed, or mark ed with permanent water-proof marking paint on the inside top (lift hole side) of each section at the time of manufacture. Furthermore, each section shall also have as a minimum requirement, the class and date of manufacture scribed or indent printed on the outside of the pipe.
3.Reinforced concrete pipe shall be the class as permitted in the contract.
4.Round Reinforced Concrete Pipe:
a.Round reinforced concrete pipe shall conform to the requirements of AASHTO M 170/M 170 M-95 with the exception of the minimum circumferential reinforcing (in2/ft (mm2/m) of pipe wall) for 15, 21 and 24 inch (375, 450, 600 mm) Class III pipe, as shown below.
b.AASHTO M 170/M 170M-95 S pecifications ar e modified as follows:
c.Only single inner cage, circular reinforcing is allowed for Class III, 15, 18, 21, and 24 inch (375, 450, 525, 600) round RCP as shown: Table 1037.01 Pipe Size (in) [mm] Class Minimum Circumferential Reinforcing (in2/ft of Pipe Wall) (cm2/m) 15 [375] III 0.08 (1.7) 18 [450] III 0.10 (2.1) 21 [525] III 0.12 (2.5) 24 [600] III 0.14 (3.0)
5.Reinforced concrete arch pipe shall conform to the requirements of AASHTO M 206/M 206M-95.
6.Reinforced concrete elliptical pipe shall conform to the requirements of AASHTO M 207/M 207M-95.
7.Precast reinforced concrete manhole risers, steps, and tops shall conform to the requirements of AASHTO M 199.
Source: Nebraska Standard Specifications for Highway Construction, 2017 Edition. Pages 906–906 of 1,048.