I-90-309EB_RAIL_SPECIALS_final.docx

AR-2204043

SPECIAL PROVISIONS

TABLE OF CONTENTS

Rail Repair – Interstate 90 Eastbound, r.p. 309.59 AR Cost Center # 2223078

AR-2204043

SCOPE OF WORK

Description. The eastbound bridge over the MRL rail line on Interstate 90 at R.P. 309.59 (SID #01594) has significant bridge rail, and approach guardrail damage on the south (right) side of the bridge/roadway. The damaged section of guardrail/bridge rail starts approximately 75 feet from the west abutment and continues onto the bridge for approximately 115 feet. Remove all damaged approach guardrail sections (approximately 75 feet) and posts, damaged steel bridge tube rail (approximately 112 feet) on the south (right) side of the bridge, and 11 damaged type-5 bridge rail posts. Salvage and reuse the undamaged existing approach concrete curb taper. Supply new and replace all damaged bridge tube rail (3 sections approximately 30 feet, 41 feet and 41 feet in length), damaged type-5 rail posts, damaged approach guardrail sections and guardrail posts and tie new approach rail into existing concrete rail end block. Counting from the west abutment, replace posts #3 - #13. Perpetuate the existing splices in the tube rail at the current locations; approximately 3 feet past post #4, approximately 2 feet past post #9, and approximately 2 feet past post # 14. All existing type-5 rail post anchor bolts are undamaged and reusable except for 2 bolts on post # 10, 2 bolts on post #11 and 1 bolt on post #13 that are bent. Straighten and reuse these 5 bent anchor bolts. Supply and replace anchor bolts that are not salvageable in accordance with the ANCHOR BOLT REPAIR SPECIAL PROVISION. Supply all new bolts (except anchor bolts for type-5 posts), nuts, washers, blocks, spacers, transitions, tube splice hardware, and any other miscellaneous hardware for completing the installation. Field verify all dimensions, rail splice locations, damage quantities, and new repair materials needed before ordering or fabricating.

Plans. No new plans or details were developed for this project. The Repair of this bridge is intended to return the structure to pre-impact damage conditions. Match new approach rail or guardrail to the existing height of the undamaged section of guardrail where the new section ties in. Supply materials and construct all repairs in accordance with the attached as-built plan sheets or standard detail drawings:

SBR-T5 (10-28-68), Standard Bridge Rail Drawing As-Built drawing numbers 9007, 9026, 9027 Approach Rail Rehab drawing number 19168 and any relevant MDT Section 606 Standard Detailed Drawings, as applicable.

CONTRACT TIME

Description. The contract work begins on a date mutually agreed upon by the contractor and MDT, after the issuance of the Purchase Order, but no later than June 5, 2023. The work is to be completed in 15 continuous working days, starting on the mutually agreed upon date. No work is allowed on Saturdays, Sundays, or State of Montana holidays.

Liquidated Damages. For work not completed within 15 working days after the mutually agreed to start date, liquidated damages will be assessed in the amount established by Subsection 108.08 of the Specifications.

ANCHOR BOLT REPAIR

Description. This work involves repairing or replacing existing damaged anchor bolts.

Epoxy Repair. Drilling existing concrete to receive the new anchor bolts, cleaning the holes, furnishing the bonding agent, and bonding the anchor bolts in place.

Materials. Use an epoxy-resin adhesive meeting AASHTO M235 Type IV requirements Construction Requirements.

Position holes as close as possible to the location indicated on the plans. Existing reinforcing may be encountered during drilling. Reposition hole if rebar is encountered. Fill abandoned holes with epoxy.

Clean holes to remove all traces of loose material. Adhere to the manufacturer’s recommendations for, drilling, cleaning, and preparing holes, but at a minimum, alternately brush and blow out with compressed air, each hole at least 3 times.

Install epoxy and bolt in accordance with the manufacture’s recommendations and completely fill the hole.

Welded repair of anchor bolts is not permitted.

Submittals. Submit manufacture’s product information for all materials used to the Project Manager for approval prior to performing the work. Do not begin installation prior to receiving approval.

Method of Measurement and Basis of Payment. Include all costs associated with providing all materials, labor, and tools necessary to complete the work in the lump sum bid for Repair Rail.

BRIDGE APPROACH SECTION

Description. Retain and leave in place all posts and guardrail that is possible. Only provide and install new approach components, w-beam, and hardware that is necessary to tie into the concrete block at the end of the bridge.

Construction Requirements. Remove any bridge approach w-beam, blockouts, posts, and hardware that is damaged. Supply and install new posts, blockouts, w-beam, hardware, transition sections, and components as necessary. Salvage, reuse, and reset the existing curb taper in accordance with the dimensions, location, and anchorage requirements on the Detailed Drawings.

Materials. Use all new materials unless otherwise specified in these provisions.

Basis of Payment. Include all costs associated with providing all materials, labor and tools necessary to complete the work in the lump sum bid for Repair Rail.

DISPOSAL AND SALVAGE OF MATERIALS

Description. Dispose of all bituminous material, concrete, reinforcing steel, posts, w-beam, and other materials not specifically mentioned as salvage and removed from the approaches and structures to the satisfaction of the Project Manager, in conformance with the Montana Solid Waste Management Act and other applicable laws, rules and regulations. This removal includes any concrete, steel posts, rails, or w-beam that was damaged in the impact and laying onsite in the MDT right-of-way. Do not waste material within the limits of the MDT right-of-way.

PROTECTION OF EXISTING MRL TRACKS AND TRAVELWAYS UNDER STRUCTURES

Description. Span 2 of this bridge crosses MRL tracks. All necessary bridge repair and replacement work is limited to span 1 and 2 of the bridge and can be accessed from the bridge deck or roadway shoulder. Bridge Rail work in span 2 ends approximately 15 feet from the edge of MRL tracks. Contain all work operations within existing roadway easement, MDT right-of-way, and top of bridge deck. No access will be allowed to the work area from under the bridge or from an access basket over the side of the bridge accessed from the bridge deck. Follow all MRL requirements (See MRL Requirements attachment as part of this contact) for working in the vicinity of MRL tracks. Provide complete protection at all times to the traveling public and Railway right-of-way under the structure. Where necessary, employ positive means, such as netting, tarpaulins, rigging, wood, or metal covering to prevent tools, materials, etc., from falling onto the Railway right-of-way. Positive protection may include traffic control methods, or other approved means to ensure complete protection.

Submit the proposed method of travel way and railroad protection to the Engineer for approval a minimum of 2 days prior to the start of work. Do not begin work until the protection plan is approved and installed to the satisfaction of the Engineer. Failure to maintain such safeguards in an effective manner may result in an immediate shutdown of work until corrected.

TRAFFIC CONTROL AND SEQUENCE OF OPERATIONS

General. Traffic control is in place to close the right shoulder on the bridge and protect the traveling public from the damaged bridge rail. The existing traffic control consists of 12 sections of temporary concrete median rail. Remove or adjust the temporary concrete median rail as necessary to fit the bridge work requirements and to minimize inconvenience to the traveling public. Accomplish traffic control in accordance with the plans, these special provisions, standard specifications, Detailed Drawings, and the Manual on Uniform Traffic Control Devices (MUTCD) in addition to the following:

Sequence of Operations.

Submit a proposed Traffic Control Plan fitting the geometries of the location to the Project Manager for approval. Include in the plan any temporary concrete median rail (if using the existing 12 State owned temporary sections and/or additional Contractor furnished sections), temporary impact attenuators, candles or cones, all construction signs and locations, temporary striping, location of arrow/information light boards, any flaggers, and any signals or lights needed for each phase of construction. Also include a construction timeline detailing beginning and end dates for all work. All traffic control devices must be in new or like-new condition and must be maintained 24 hours a day or removed at the end of each work shift.

State Furnish. The 12 sections of temporary concrete median rail are State furnished and may be used at the contractor’s discretion as part of the approved traffic control plan. All State-furnished median barrier rail will remain property of MDT. Remove, return, and stockpile all 12 sections of temporary concrete barrier to the Bozeman Maintenance yard at the completion of the project. Contact Todd Meagher, at (406) 556-47149 or (406) 581-0948, three days prior to delivery to coordinate specific delivery time and stockpile location within the yard.

Maintain 2 Lanes of east bound traffic on I-90 through the project area at all times.

Basis of Payment. Include all costs associated with providing all materials, labor and tools necessary to complete the work in the lump sum bid for Repair Rail.

TEMPORARY CONCRETE MEDIAN RAIL

Furnish additional concrete median rail necessary to meet the needs of the submitted Traffic Control Plan required in TRAFFIC CONTROL AND SEQUENCE OF OPERATIONS, or for other temporary guardrail or traffic control and work zone protection at the bridge site, and install it as approved by the Engineer. The median rail may be either new precast rail or used rail meeting current standards in like-new condition. The rail supplied by the Contractor under this item remains the property of the Contractor when no longer needed for use on the project.

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