least the density of the adjacent material. When specified, use flowable backfill in accordance with Subsection 206.4.5.2, Flowable Backfill. During backfilling, brace hydrants, valve boxes, or other vertical fixtures and adjust the fixture’s top to correspond with the fixture’s established elevation.
620.5MEASUREMENT and PAYMENT
1 The engineer will measure Valve Boxes___ in [mm]; Fire
Hydrant; Adjustments, Fire Hydrants; Adjustments, Valve Boxes; and Thrust Blocks by the each.
2 The department will measure and pay as follows:
Pay Item
Pay Unit
Measure to the Nearest
Pay to the Nearest
Adjustments, Fire Hydrants
EA [Ea]
EA [Ea]
EA [Ea]
Adjustments, Valve Boxes
EA [Ea]
EA [Ea]
EA [Ea]
Fire Hydrant
EA [Ea]
EA [Ea]
EA [Ea]
Thrust Blocks
EA [Ea]
EA [Ea]
EA [Ea]
Valve Boxes in [mm]
EA [Ea]
EA [Ea]
EA [Ea]
573
Vacant
574
Structural Plate Pipe
622.1DESCRIPTION
1 This
section describes the requirements for constructing structural plate pipe, pipe arches, stock passes, and underpasses.
622.2MATERIALS
1 Provide materials in accordance with the following:
Materials
Subsection
Aluminum Alloy Structural Plate Pipe Asphalt Mastic for Field Coating Class B Bedding Galvanized Coating High-Strength Bolts and Fasteners Structural Plate Pipe
808.9 804.5 803 815.14 815.2 808.8
622.3EQUIPMENT
1 For applying asphalt mastic, provide equipment that uses a high-pressure spray.
622.4CONSTRUCTION
622.4.1 General 1 Use galvanized bolts, washers, and nuts.
Use bolts long enough to engage the full
length of the nut. 2 Cover pipes to prevent damage during construction.
622.4.2 Size and Thickness Designations
The department specifies sizes based on steel plate structures and will accept aluminum alloy structural plate pipe structures as an alternate. Determine aluminum alloy structure size from the specified Equivalent Size Table. For steel or aluminum, determine the plate thickness by the fill heights, or provide thicker-gage metal at no additional cost to the department. 2 Use equally thick plates within a structure.
In elliptical structures, use a bottom plate or plates wide enough to provide at least 10 percent of the structure periphery with the
575
Structural Plate Pipe