DESCRIPTION
605.01.01 General. This work consists of furnishing and installing plastic pipe.
MATERIALS
605.02.01 General. Material shall conform to Subsection 601.02.01 and the requirements specified herein.
Plastic pipe shall conform to Subsections 708.03.04 (a) Smooth Wall Polyethylene Pipe and (b) Corrugated Polyethylene Pipe. Pipe shall be homogenous throughout an d free of visible cracks, holes , foreign inclusions, or other defects. The pipe shall be uniform in color, opacity, density, and other physical properties. Compliance with the requirements of these specifications shall be certified in writing by the pipe supplier. The dimensions of pipe shall be as shown on the plans and are in reference to nominal diameter unless otherwise indicated. Provide associated fittings that properly fit the pipe supplied. Provide pipe and fittings free from defects which would hinder their ability to function as designed. CONSTRUCTION
605.03.01 General. Use construction methods conforming to Subsections 601.03.01 through 601.03.06 and
the requirements in this Section. Stockpile, handle, install, and firmly join pipe as specified by the manufacturer . Submit a copy of the manufacturer’s installation instructions prior to installation. Lubricate gaskets requiring lubricant with the lubricant recommended by the manufacturer. Pipe having any of the following damage will not be allowed for use: serious abrasion, cutting, or gouging of the inside or outs ide surface extending to more than 15% of the wall thickness in depth; kinking due to excessive or abrupt bending; flattening, particularly if localized over short lengths of the pipe amounting to more than 5% of the original diameter; and any abrasion or cutting of the inside surface.
605.03.02 Laying Pipe. Pipe laying shall begin at the downstream end of the pipeline except for extensions of
existing pipes. Carefully lower pipe and accessories by means of derrick, ropes, belt slings, or other means per manufacturer’s recommendations. Place the bottom of the pipe in contact with the shaped bedding throughout its full length. Place the female ends or outside circumferential laps of pipes facing upstream such that a shingling effect is obtained. Maintain the manufacturer’s recommended minimum and maximum cover at all times unless otherwise shown in the contract. All pipe to pipe connections shall be bell and spigot, interlocking, or fusion welded connections for watertight installation. Watertight connections to drop inlets, metal end sections, box culverts, and other structures are not necessary unless specified. When specified, w ater tight connections to structures shall be made using a waterstop gasket or booted connection precast into the struc ture per manufacturers recommendations. Any repair or other connections of pipe to pipe which cannot be performed with an approved connection as listed above, shall require a concrete collar connection, approval of the Engineer, and shall maintain proper a lignment and grade across the joint without displacement of pipes. The minimum pipe section length at the end of a pipe run terminating with a metal end section or headwall shall be 2.4 m ( 8 ft). Cut corrugated pipe to length at the center of nearest corrugation valley so as to not expose the annular space of the outer corrugation. Do not place backfill until the pipe has been inspected. Ensure that no “floating” occurs during installation of culverts. Take up and relay or replace pipe found to be out of alignment, unduly settled, or damaged. When cutting s teel reinforced thermoplastic ribbed pipe, cut the pipe to length and protect the exposed reinforcing according to the manufacturer ’s specifications . 605 PLASTIC PIPE
a.Smooth Wall Polyethylene Pipe. Join pipe by the thermal fusion process according to ASTM F2620 and the manufacturer's specific recommendations or utilization of an interlocking joint system installed per the manufacturer ’s specifications. Pipe joining by the thermal fusion process shall be accomplished with qualified personnel. In order to allow the joining operation to continue in adverse weather conditions, build a shelter for the joining machine. Do not allow water or any other foreign materials to contact the heater plate or preheate d pipe ends. Pipe shall be brought to within 3 °C (5 °F) of earth temperature prior to making final length cuts at termination points to structures . All cuts shall be straight and neat.
605.03.03 Deflection Testing. Vertical deflections of pipe shall not exceed 5% . Test installed pipe by the
mandrel requirements stated herein or other approved methods. Perform the test i n the presence of the Engineer. Do not place base aggregate or plantmix pavement over pipe installations until deflection testing has been performed and is acceptable. Perform deflection tests after pipe installat ion, backfill, and completion of earthwork to finished subgrade . The mandrel shall be a rigid, nonadjustable, odd- numbered legged (minimum 9 legs) mandrel having a length not less than its nominal diameter. The minimum diameter at any point shall be 5% less than the nominal diameter of the pipe being tested. The mandrel shall be fabricated of steel, fitted with pulling rings at each end, stamped or engraved on some segment other than a runner with the nominal pipe size and mandrel outside diameter, and furnished in a suitable carrying case. The mandrel shall be approved before use. Use of an unapproved mandrel or a mandrel altered or modified after approval will invalidate the t est. The mandrel shall be pulled through by hand and shall move freely through the pipe without excessive force. If the mandrel fails to pass, the pipe is over deflected. Remove and reinstall over deflected pipe and retest . Do not reinstall damaged pipe. METHOD OF MEASUREMENT
605.04.01 Measurement. Measurement shall conform to Subsection 601.04.01 and the requirements specified
herein. Polyethylene pipe will be measured by the linear meter (linear foot). BASIS OF PAYMENT
605.05.01 Payment. Payment shall conform to Subsection 601.05.01 and the requirements specified herein.
The accepted quantities, measured as provided above, will be paid for at the contract price per unit of measurement for the pay items listed below that are shown in the proposal. Payment will be full compensation for the work prescribed in this Section. Payment will be made under: Pay Item Pay Unit (size) (type) Polyethylene Pipe ................................ ................................ ......................................................... Linear Meter (Linear Foot) SECTION 606 STRUCTURAL PLATE CULVERTS DESCRIPTION
606.01.01 General. This work consists of furnishing and installing structural plate pipe, arches, and pipe arch
culverts. MATERIALS
606.02.01 General. Material shall conform to Subsections 709.03.06 or 709.03.07.
Where an existing structural plate culvert is to be extended or otherwise modified, fabricate the plates and all accessories of the same material (steel or aluminum) as the existing. The required thickness of the plates for each structure shall be specified in the contract documents. The thickness specified is for steel plate, aluminum plate of equivalent strength may be substituted. The bottom plates for structural plate p ipes and pipe arches shall be the next plate thickness larger than the thickness specified for the top and side plates. When 7.11 mm (0.280 in.) plate thickness is specified, the bottom plates shall also be 7.11 mm (0.280 in.). Ship and handle plates in s uch a manner as to prevent bruising, scaling, or breaking of the galvanized coating. Repair any damaged galvanized coating according to Subsection 604.02.01. Design the steel structural plate pipe or the aluminum structural plate pipe according to AASHTO LRFD Bridge Design Specifications, Section 12, latest edition and supplements thereto. Submit design calculations and working drawings for structural plate structures for review and approval according to Subsection 105.02. Include on the working dra wings the NDOT contract number, material designations, bill of materials, complete fabrication details, and assembly/installation guidelines including quality control measures to control loads, shape, and movement. Calculations and working drawings shall b e prepared and stamped by a Nevada Registered Professional Civil Engineer. The lengths and sizes shown in the plans are approximate. Do not order materials until the calculations and working drawings are approved. CONSTRUCTION
606.03.01 Earthwork. Excav ation and backfill shall conform to Sections 206 and 207.
Lay the pipe in a trench excavated to the established lines and grades. Grade and prepare the bottom of the trench to provide full contact with the pipe throughout its entire length. The height of new embankments may be varied as directed before installing pipes in new embankments on a steep slope or in a difficult location. Excavate and bed the pipe with compacted sand or compacted earth fill. The depth of the sand or compacted fill below the pipe shall not be less than one- third the inside diameter of the pipe with a minimum of 100 mm (4 in.) and a maximum of 300 mm (12 in.) with the exception that an extra 40 mm shall be added for every meter (1/2 inch for every foot) the trench exceeds 5 m (16 ft) in depth. Extend this bed at the sides of the pipe at least a distance of one-fourth the outside width of the pipe.
606.03.02 Field Inspection. Furnish an itemized statement of the number and length of the plates in each
shipment by the manufacturer . Furnish single plates in standard sizes to permit structure length increments of 600 mm (24 in.). If 25% or more of the plates in any shipment fail to conform to these specifications, the entire shipment may be rejected.
Source: Nevada Standard Specifications for Road and Bridge Construction, 2014 Edition. Pages 329–330 of 610.