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. 606 STRUCTURAL PLATE CULVERTS
606.03.03 Assembling. Provide a copy of manufacturer’s assembly instructions before assembly. The
instructions shall show the position of each plate and assembly order. Assemble the structural plate structures according to the manufacturer’s assembly instructions. Hold the unsupported edges of all plates in position by temporary props. Extend each row of side plates far enough to support the plate above until the first complete ring has been assembled. Progressively install a sufficient number of bolts to hold the plates in position. Do not tighten bolts until tightening will not interfere with the adjustment and matching of additional plates and sections. Exercise care in the use of drift pins or pry bars to prevent chipping or injury to the galvanized or other protective coating. Repair damaged coatings as set forth in Subsection 604.02.01. After all plates are in place, progressively and uniformly tighten the bolts from one end of the structure. Repeat the tightening operation to be sure that all bolts are tight. Torque bolts to a minimum of (a) 135 N •m (100 ft -lb) for plates of 4.78 mm (0.188 in.) and lighter, and (b) 200 N •m (145 ft -lb) for plates of 5.54 mm (0.218 in.) and heavier. Recheck and retighten as necessary just before backfilling. Install the elliptical -shape d pipes with their long diameter vertical. Install pipe arches with their span width horizontal.
606.03.04 Strutting. Timber strut vertically 3% out of round structural plate pipes, which are not fabricated out
of round before erection, before placement of the embankment. Deform the pipe to the required degree by means of suitable jacks by approved methods. A tolerance of 25% above or below the specified elongation will be permitted. Uniformly strut the entire length of the pipe. Leave the struts in place until the embankment is complete and compacted, unless otherwise ordered. In lieu of strutting, structural plate pipe may be furnished with the vertical axis fabricated out of round 5% of the nominal diameter. A tolerance of 25% above or below the s pecified elongation will be permitted. Make the elongation by approved shop methods. Satisfactorily repair or replace any coating damaged or destroyed.
606.03.05 Workmanship. The completed culvert shall show careful, finished workmanship in all particular s.
Structural plates which show defective workmanship will be rejected. The presence of any of the following defects in any individual culvert plate, or in general in any shipment, shall constitute sufficient cause for rejection:
a.Uneven laps.
b.Variation from a straight centerline.
c.Ragged edges.
d.Loose, unevenly lined, or spaced bolts.
e.Bruised, scaled, or broken galvanized coating. (See Subsection 604.02.01 for repair)
f.Dents or bends in the metal itself.
606.03.06 Headwalls and Footings. Where shown on the plans, construct headwalls in connection with
structural plate pipe. Make the ends of the pipe flush with the headwall face. Construct footings in connection with structural steel arches. Rest each side of the structural plate arches on a galvanized metal angle or channel bearing, securely anchored to the footing and capable of resisting the arch thrust without damage to said angle or channel. Construct headwalls and footings according to Sections 501 and 502.
606.03.07 Exten ding Existing Structural Plate Culverts. When extending existing structural plate culverts,
make the connection of the old and new sections by punching any necessary bolt holes, furnishing bolts, nuts and washers, changing location of individual plates, and any other work required in the completion of the connection. Where an existing headwall is in place, completely remove the headwall according to Section 202. STRUCTURAL PLATE CULVERTS 606 METHOD OF MEASUREMENT
606.04.01 Measurement. Structural plate pipe, arches, or pipe arches will be measured by the linear meter
(linear foot). The number of linear meters (linear feet) shall be the average of the top and bottom centerline lengths for structural plate pipe or pipe arches. Structure excavation, backfill, Portland cement concrete and reinforcement required for headwalls, footings, structures, and other items required to complete the work will be measured and paid for under their respective Sections of these specifications. BASIS OF PAYMENT
606.05.01 Payment. 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. Provide for handling whatever water is encountered at the site with no additional compensation allowed therefore. Payment will be made under: Pay Item Pay Unit (size) Structural Plate Pipe ................................ ............................................................................................... Linear Meter (Linear Foot) (size) Structural Plate Pipe Arch ....................................................................................................................... Linear Meter (Linear Foot) (size) Structural Plate Arch ................................ ............................................................................................... Linear Meter (Linear Foot) SECTION 607 UNDERDRAINS DESCRIPTION
607.01.01 General. This work consists of constructing underdrains using pipe , drain backfill, and geotextile .
MATERIALS
607.02.01 General. Material shall conform to the following Subsections and Section:
Portland Cement ................................ .................................................................................................................................... Section 701 Drain Backfill ........................................................................................................................................................... Subsection 704.03.01 Grout and Mortar Aggregate .................................................................................................................................... Subsection 706.03.04 Perforated Concrete Pipe ........................................................................................................................................ Subsection 708.03.02 Clay Pipe ................................................................................................................................................................ Subsection 708.03.03 Corrugated Polyethylene Drainage Pipe ................................ ................................ ............................................. Subsection 708.03.04 (d) Smooth Wall Polyvinyl Chloride Pipe .................................................................................................................. Subsection 708.03.04 (e) Corrugated Steel Pipe for Underdrains ................................ .................................................................................... Subsection 709.03.04 Corrugated Aluminum Pipe for Underdrains ............................................................................................................ Subsection 709.03.05 Engineering Fabrics ................................ ................................ ............................................................................................... Section 731 Underdrain pipe may be corrugated steel, corrugated aluminum, concrete, clay, corrugated polyethylene , or smooth wall polyvinyl chloride pipe. Assemble each separate underdrain installation from one material only. Metal pipe plate wall thickness shall be 1.6 mm (16 gage) for steel and 1.5 mm (16 gage) for aluminum unless otherwise noted on the plans. Submit in writing, 2 weeks in advance of the preconstruction conference, the type of underdrain pipe to be furnished. No changes will be allowed to the type of material chosen. The lengths shown on the plans are approximate. Do not order and deliver the pipe until a correct list of sizes and lengths is furnished by the Engineer. Ship and handle pipes in such a manner as to prevent bruising, scaling, or breaking. Repair any damaged galvanized coating according to Subsection 604.02.01. Do not lay any pipe which is cracked, checked, spalled, or damaged. CONSTRUCTION
607.03.01 Earthwork. Excavation and drain backfill shall conform to Sections 206 and 209 respectively with the
following modifications:
a.Excavate trenches to the dimensions and grade required.
b.Place geotextile at locations shown on the plans and in accordance with Section 610.
c.Place a minimum 75 mm (3 in.) bedding layer of drain backfill material in the bottom of the trench for its full width and length, and bring to a uniform grade.
d.If an item for grouting drain backfill is shown in the proposal, cover drain backfill with a thick grout not less than 25 mm (1 in.) in thickness. Compose the grout of 1 part Portland cement and 5 parts grout aggregate, by volume. Mix grout materials to a suitable consistency. Use grout within 30 minutes after the addition of water. Thoroughly tamp grout to provide an impervious layer over the entire surface of the drain backfill.
607.03.02 Laying Pipes. Lay bell and spigot concrete or clay pipe upgrade with the bell end upgrade and the
spigot end not quite fully entered in the adjacent bell. Lay pipe true to line and grade with a uniform bearing under the full length of the barrel. Cover the pipe joints with 2 ply tar paper strips not less than 150 mm (6 in.) in width and of sufficient length to permit the ends to be turned outward and laid flat on the bottom course of drain backfill on either side of the pipe f or a distance of 75 mm (3 in.). When pipe does not have perforations around the full circumference, lay with the perforations at the bottom of the pipe. Firmly bed the pipe throughout its length.
Source: Nevada Standard Specifications for Road and Bridge Construction, 2014 Edition. Pages 331–334 of 610.