754Pipe Joint Sealant ........................................................ 907.11

717.03 General Requirements

Forming, punching, and assembling shall be in accordance with AASHTO LRFD Bridge Construction Specifications. The radius of the arc joining the top to the bottom 30 shall be in accordance with 908.09(a)1. Excavation shall be in accordance with the applicable requirements of 715 for pipe and pipe-arches and 206 for arches. Concrete shall be placed in accordance with 702 a nd reinforcing bars shall be placed in accordance with 703. Each side of an arch shall rest in a groove formed into the masonry or shall rest on a galvanized angle or channel securely anchored to or embedded in the structure. Where the span of the arch is greater than 14 ft, or the skew angle is more than 20°, a metal bearing surface having a width at leas t equal to the depth of the corrugations shall be provided. 40 Metal bearings may be either rolled structural or cold-formed galvanized angles or channels no less than 3/16 in. in thickness with the horizontal leg securely anchored to the substructure on 24 in. maximum centers. When the metal bearing is not embedded in a groove in the substructure, one vertical leg shall be punched to allow bolting to the bottom row of plates. If it is necessary to make a tee-connection to a structural plate pipe, pipe-arch, or arch, a stub-tee connection of the size and at the locations shown on the plans shall be furnished and placed, and its length shall be no less than 12 in. and no more than 24 50 in. The stub shall be connected in the field and the stub connection bituminous coated. The stub connection to the entering pipe sh all be made by means of a connecting band of the required size or by means of concrete collars, as directed. Structures on which the spelter coating has been bruised or broken either in the shop or in shipping, or which shows defective workmanship, shall be rejected unless it can be repaired satisfactorily. This requirement applies not only to the individual plates but to the shipment on any contract as a whole for an entire contract. The following defects are considered as poor workmanship and, if present in an individual culvert plate, will be cause for rejection: 60 717.03

717.04 Backfill

All structural plate pipe and pipe arches shall be backfilled with structure backfill or flowable backfill. Arch backfill shall be structure backfill. The amount of camber on the invert of the pipe or pipe-arch shall be varied to suit the height of fill and supporting soil, except the camber grade shall not be above level. Structure backfill shall be placed in accordance with 211. Flow able backfill shall be placed in accordance with 213. An adequate earth cover shall be provided over the structure, as shown on the 80 plans, before heavy construction equipment is operated over it. This earth cover shall be free of stones. Where backfilling at arches before head walls are placed, the material shall first be placed midway between the ends of the ar ch, forming as narrow a ramp as possible, until the top of the arch is reached. The ramp shall be built up evenly on both sides and the backfilling material compacted as it is placed. After both ramps have been built to the top of the arch, the remainder of the backfill shall be deposited in both directions from the center to the ends and evenly on both sides of the arch. 90 If the headwalls are built before the arch is backfilled, the backfill material shall first be placed adjacent to on e headwall until the top of the arch is reached, after which the fill material shall be placed from the top of the arch towards the other headwall. The material shall be deposited evenly on both sides of the arch. In multiple installations the above proce dure shall be followed. The backfill shall be brought up evenly on both sides of each ar ch so that unequal pressures are avoided. Compaction by saturation will not be allowed, except below the free water table, then the provisions of 203.23 do not apply. 100

717.05 Relaid Pipe and Pipe-Arch

When required, any existing structural plate pipe or pipe-arch shall be taken up, re-laid, and extended. Removal shall be in accordance with 202.04 and the operations involved in its relaying shall be in accordan ce with similar operations contained herein for new structural plate pipe or pipe-arch. 717.05

717.06 Blank

717.07 Concrete Paved Inverts 110

Structural plate pipe and pipe-arches w ith concrete field paved inverts shall be constructed in accordance with and at locations shown on the plans or where directed. The paved inverts for these structures shall be reinforced with WWR and sealed with pipe joint sealant as shown on the plans. The concrete for paving the invert shall not be placed until the backfilling and embankment procedures have been completed satisfactorily. 717.08 Method of Measurement Structural plate pipe and pipe-arch, new, extended, and re-laid, will be measured 120 in accordance with 715.13. Structural plate ar ches will be measured by the linear foot, complete in place. Metal bearings and other hardware required to attach the structural plate arch to its substructure will not be measured for payment. Concrete for headwalls and substructures will be measured in accordance with 702.27. Volumes occupied by a structural plate arch extending through the headwall will be deducted. Reinforcing bars used in substructures will be measured in accordance with 703.07. Concrete anchors will be measured in accordance with 715.13. Reinforcing bars, straps, and hook bolts used in anchors will not be measured for payment. 130 Structural backfill will be measured in accordance with 211.09. Flowable backfill will be measured in accordance with 213.08. 717.09 Basis of Payment The accepted quantities of new, extended, or re-laid structural plate pipe, or pipe-arch will be paid for in accordance w ith 715.14. Structural plate arches will be paid for at the contract unit price for arch , structural plate, of the size specified. Concrete, A, structures will be paid fo r in accordance with 702.28. Reinforcing bars in substructures will be paid for in accordance with 703.08. Concrete anchors will be 140 paid for in accordance with 715.14. If a pipe or pipe-arch is lowered or relocated, or if rock or unsuitable material is encountered which requires additional excava tion, such excavation will be paid for in accordance with 715.14. Structure backfill will be paid for in accordance with 211.10. Where used as a substitute for structure backfill, flowable backfill will be paid for as structure backfill. Where specified for backfill, flowable backfill will be paid for in accordance with

213.09 150

Stub-tee connections including the connecting bands, concrete collars, or cement 717.06 757 mortar beads will be paid for in accordance with 715.14. Payment will be made under: Pay Item Pay Unit Symbol Arch, Structural Plate, Min. Area ____ sq ft ............................. LFT The cost of excavation, concrete field paved inverts, disposal of surplus materials, reinforcing bars, straps, and hook bolts used in anchors, and necessary incidentals shall be included in the cost of the pay item. The cost of metal bearings and other hardware needed to attach the structural plate arch to its substructure shall be included in the cost of the arch.