622Structural Plate Pipe

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 808.9 Asphalt Mastic for Field Coating 804.5 Class B Bedding 803 Galvanized Coating 815.14 High-Strength Bolts and Fasteners 815.2 Structural Plate Pipe 808.8

622.3EQUIPMENT

1 For applying asphalt mastic, provide equipment that uses a high-pressure spray.

622.4CONSTRUCTION

622.

4.1General

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.

4.2Size and Thickness Designations

1 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

Structural Plate Pipe SECTION 622 heaviest thickness specified. For pipe-arches, stock passes, and underpasses, use bottom plates (including corner plates) of the heaviest thickness specified. 3 Fourteen calendar days before fabrication, submit four sets of installation drawings to the engineer. Show proposed details for structural plates, the locations of bolt holes, and the type, size, thickness, and number of plates, bolts, and washers. Match mark plates that are not standard. Show match marks on the installation drawings. 4 Obtain fill heights and pipe lengths from the engineer before ordering. 622.

4.3Excavation and Bed Preparation

1 Excavate in accordance with Subsection 206.4, Excavation. Place the structure on an earth foundation of uniform density. 2 For structures with a specified corner pressure of 3 ton/ft² [300 kPa], prepare bedding in accordance with a class B installation in Subsection 603.4.4, Pipe Bed Preparation. Prepare as class C bedding for other installations. 622.

4.4Assembly of Plates

1 Assemble plates and tighten bolts in accordance with the manufacturer’s recommendations for the type of structure. Torque bolts from 100 ft•lbs [135 N•m] to 300 ft•lbs [405 N•m]. 2 Before extending an existing structural plate pipe with a beveled end section, remove individual plates to obtain a near-vertical end. 622.

4.5Field Coating

1 When specified, field-coat structural plate pipe with asphalt mastic; coat interior and exterior pipe faces and steel mitered ends. Before coating, remove foreign matter from surfaces. Apply uniformly to obtain a thickness of at least 0.05 in [1300µm], measured on corrugation crests. Apply with high-pressure spraying equipment. Brush or trowel in small areas where spraying is impractical. The underside of bottom plates may be coated during assembly. 622.

4.6Backfilling

1 Place and compact in accordance with Subsection 206.4.5, Backfilling. Completely backfill and compact below corner plates.

Structural Plate Pipe SECTION 622

622.5MEASUREMENT and PAYMENT

622.5.1 General

1 The engineer will measure Structural Plate Pipe___ in [mm], Structural Plate Pipe - Arch___ × ___ in [mm], and Structural Plate Stock Pass ___ × ___ in [mm] by the foot [meter] along the invert centerline from end to end. The length for payment will not exceed the length staked.

2 The engineer will measure structural plate pipe extensions after removal of the existing beveled end section, if applicable, from the end of the existing pipe along the invert to the end of the new pipe.

3 The department will pay as follows:

Pay Item

Pay Unit Measure to the Nearest Pay to the Nearest Structural Plate Pipe in [mm] FT [m] 0.1 ft [0.05 m] FT [0.5 m] Structural Plate Pipe-Arch × in [mm] FT [m] 0.1 ft [0.05 m] FT [0.5 m] Structural Plate Stock Pass × in [mm] FT [m] 0.1 ft [0.05 m] FT [0.5 m]