507Prestressed Concrete Bridge Members

507.1General Description

This work consists of furnishing prestressed concrete bridge members, complete in place, except as noted for piling in this specification. The work includes all items and work necessary to complete the erection according to the plans and specifications. All prestressed concrete bridge member nominal lengths shown on the plans are horizontal dimensions. The contractor will be responsible for adjusting the lengths, as necessary, to account for the final erected position of the member. Fabricate the ends of all members to be vertical in the final erected position. Slope bearing assemblies to accommodate the erected position of the member. 507.1.01 Definitions PSC: Prestressed concrete. Prestressed concrete may be designated “PSC” in Specifications and on Plans and other documents. 507.1.02 Related References

General Provisions 101 through 150. 507.1.03 Submittals

Furnish erection drawings to the Department only when the units are not interchangeable with respect to the following: • Transverse placement within a span • Longitudinal reversal within a span The drawings shall cover superstructure unit placement, including bearing components.

Submit shop drawings to the Department on standard Plan size 22 in. x 36 in. (550 mm x 900 mm) sheets showing complete beam details of the following: • Non-prestressed reinforcement • The method of retaining depressed strands in place • Calculations for determining the strand elongation required to produce the specified pre-tensioning force • Detensioning schedule • Increased length of beam due to vertical alignment As an option, shop drawings may be submitted on plan sheet sizes of 12 in. x 18 in. (305 mm x 457 mm) or 11 in. x 17 in. (279 mm x 432 mm) for review and approval. Information contained on these sheets must be legible. 714 714 714 714 714 714

After shop drawings have been approved, submit an electronic file that is compatible with Bentley Microstation J (Version 7) Cadd operating system, or an electronic file in Adobe Acrobat Portable Document Format (.pdf) to the Engineer. For bridges carrying railroads only, after shop drawings have been approved, submit one full size set of reproducible drawings to the Department.

507.2Materials

All materials and manufacturing methods shall meet the requirements of Section 865. Reference is also made to the following: Material Section Plain Steel Bars—Threaded Ends 853.2.05 Anchor Bolts 852.2.02 Bronze Bushings, Bearings, and Expansion Plates 857 Structural Steel 851.2.01 Elastomeric Pads 885.2.01 Plain Cotton Duck 881.2.01 Rubber Impregnated Cotton Duck 881.2.02 Paint 870 Substitute materials according to Subsection 865.2.01.B.3, Substitution of Reinforcement and Subsection 865.2.01.B.4, Substitution of Strands. 507.2.01 Delivery, Storage, and Handling

See Subsection 865.2.01, Prestressed Concrete Bridge Members. Replace members damaged in handling or storage (at no additional expense to the Department) unless the Engineer determines that the member is usable.

In handling PSC beams, the Contractor shall ensure that beams maintain an upright position at all times and shall pick up beams at their pickup and support points (see Subsection 865.2.01.B.14.e, Beams). Disregarding this requirement could cause a bridge member to collapse.

507.3Construction Requirements

507.3.01 Personnel General Provisions 101 through 150. 507.3.02 Equipment General Provisions 101 through 150. 507.3.03 Preparation General Provisions 101 through 150. 507.3.04 Fabrication See Subsection 865.2.01.B, Fabrication. 715 715 715 715 715 715

507.3.05 Construction

Requirements for preparing steel bearing areas for PSC bridge members will be the same as those specified in Section 501 for Steel Structures, listed below. Other requirements are also noted below:

See Subsection 501.3.05.C.1, Steel on Concrete.

See Subsection 501.3.05.C.2, Steel on Steel.

See Subsection 501.3.05.C.3, Steel on Self-lubricating Bronze Plates.

See Subsection 501.3.05.C.4, Steel on Elastomeric Pads.

For concrete caps that PSC deck units will bear directly on, prepare bearing areas as follows:

Type IV—Floated Surface Finish.

The Contractor may use felt of a lighter weight than that required on the Plans by increasing the number of layers proportionally.

For treated timber piles that will support PSC caps, prepare bearing areas as follows:

Erect bridge members according to the handling requirements in Subsection 507.2.01, Delivery, Storage, and Handling, and as follows. Refer questions concerning structural requirements to the Engineer.

Erect beams as follows:

Plans or as directed by the Engineer.

Engineer.

devices are bearing against the pads.

Erect PSC caps as follows:

An approved mortar may be substituted for the expanded mortar as long as it is non-shrinking and commercially produced.

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Erect PSC deck units (such as flat slabs and double tees) that will bear directly on caps so that all sections have a smooth, uniform bearing on the caps.

exterior section curbs.

use steel shims and cut them to the following dimensions: The same shape as the area to be shimmed The thickness required to produce the required elevation and load distribution

equipment on the decks, do not place the equipment until the cap drift pin mortar reaches 3000 psi (20 MPa).

Pour expanding mortar into shear keys between deck units as follows. The mortar shall meet the requirements of Section 506.

Place anchor bolts and adjust nuts according to Subsection 501.3.05.B.3, Place Anchor Bolts and Adjust Nuts.

Make sure PSC bridge members are 45 days old before grading the bridge deck for screeding.

Tighten diaphragm bars as follows:

Use the Type III—Special Surface Coating Finish on PSC bridge members according to Subsection 500.3.05.AB and as follows: • Beams -- Outside faces of certain exterior beams as indicated on the table of Bridge Areas Bridge Areas Requiring a Type III Finish, in Subsection 500.3.05.AB. • Deck Units -- Traffic and top faces of curbs on exterior units and the outside faces of certain exterior beams as specified in the table of Bridge Areas Requiring a Type III Finish, in Subsection 500.3.05. AB. 507.3.06 Quality Acceptance General Provisions 101 through 150. 717 717 717 717 717 717

507.3.07 Contractor Warranty and Maintenance General Provisions 101 through 150.

507.4Measurement

Prestressed concrete piling shall be furnished, driven, and measured as a Pay Item under Section 520.

Accepted PSC beams will be measured in linear feet (meters) of each different type designation of beam. Linear measurements will be the nominal lengths shown on the Plans. Beam type designations will be shown on the Plans and will be related to any of the following: • Cross sectional area and prestress tendons • AASHTO type • Special design

Accepted PSC deck units (such as flat slabs and double tees) will be measured for payment per span of each different nominal span length.

Accepted PSC caps will be measured for payment per each cap.

PSC box beams will be measured for payment by the linear foot (meter) of beam of each vertical depth and by the number of strands in the beam. 507.4.01 Limits No separate measurement will be made for any of the following: • Painting, rubbing, anchor, and bearing components, as well as diaphragm bar assemblies on accepted PSC beams • Individual deck units on which curb sections are located • Material used in anchor components, shear key pours, and construction expansion joints • Drifting components, anchor components, and asphalt-saturated felt for PSC caps • Grouting between PSC box beams • Furnishing and installation of diaphragm bar assemblies and anchor and bearing components

507.5Payment

Payment will be made under: Item No. 507 PSC Beam (Type) Per linear foot (meter) Item No. 507 Box Beam (Depth/Strands) Per linear foot (meter) Item No. 507 PSC Deck Units_____ foot (meter) span Per span Item No. 507 PSC Caps Per each 718 718 718 718 718 718

The quantity of beams, determined as provided in Subsection 507.4, Measurement, will be paid for at the Contract Price per linear foot (meter) of each different type designation, complete in place.

The quantity of PSC box beams will be paid for at the Contract Unit Price bid per linear foot (meter). Payment shall be full compensation for furnishing and erecting the beam.

The quantity of deck units will be paid for at the Contract Price per span of each different nominal span length, complete in place.

The quantity of caps will be paid for at the Contract Price per each, complete in place.

Material allowance payments for bridge beams will be determined and paid for according to the requirements of

Subsection 109.07, Partial Payments.

507.5.01 Adjustments

Upon completion of the erection in its final manner and position, 95 percent of the Contract Price will be paid on the

next statement.

If there is no field rubbing or painting required, the 95 percent may be increased to 100 percent of the Contract Price.

If this work is required, the remaining 5 percent will be included on the next statement after the Contractor

satisfactorily completes the work.. 719 719 719 719 719 719