2505 Removal and Construction of Guardrail

Section 2505. Removal and Construction of Guardrail.

2505.01 DESCRIPTION.
This work shall consist of constructing guardrail by furnishing and installing posts, beams or cables, end anchors, and any special connections and fittings which may be required in the contract documents. It shall also consist of removing existing guardrail.

2505.02 MATERIAL.
The material used for construction of guardrail shall meet requirements of Division 41.

2505.03 REMOVAL AND CONSTRUCTION OF GUARDRAIL.

A. Removal of Guardrail.
The Contractor shall remove the guardrail as shown in the contract documents. The guardrail shall be removed so that all material considered suitable by the Engineer for future use may be salvaged. Guardrail material to be salvaged will be listed on the plans along with a location it should be delivered to. This Guardrail material shall remain the property of the Contracting Authority. Guardrail not suitable for future use shall be removed from the project and become the property of the Contractor.

Guardrail posts designated by the Engineer as being salvable shall be removed without damage. Those having no salvage value shall be pulled. All holes shall be backfilled with suitable soil. Sand or other granular materials are not acceptable for use as backfill. Backfill shall be placed in lifts not exceeding 4 inches (100 mm) and thoroughly compacted before the next lift is placed. All holes shall be filled and tamped within the same working day.

The Contractor shall carefully remove, disassemble, and clean the salvaged guardrail without damaging any parts. Material that is damaged by the Contractor shall be replaced with new material of the same kind by the Contractor at no additional cost to the Contracting Authority. The salvaged guardrail materials shall be stockpiled as indicated in the contract documents. The Contractor shall restore any area disturbed by the removal operation to an acceptable condition.

The Contractor shall remove the delineators and object markers as shown in the contract documents or as designated by the Engineer. The delineators and object markers shall be removed so that all material considered suitable by the Engineer for future use may be salvaged. The salvaged material shall remain the property of the Contracting Authority unless otherwise noted in the contract documents. The Contractor shall remove non-salvaged material off the project site.

B. Installation of Guardrail.
The guardrail shall be erected to the specified line and mounting height. Guardrail shall be constructed as follows:

1. Formed Steel Beam Guardrail.
Rail elements shall be W-beam or thrie-beam, as designated in the contract documents. When not designated, W-beam shall be installed.

The rail elements shall be ready for assembly when delivered to the project site. Punching, drilling, cutting, or welding will not be allowed in the field.

2. Guardrail Cable.

a. Three Cable Guardrail

Individual cables may be spliced by use of an approved device installed where no interference with any other function will occur. One splice will be allowed per cable. Cable may not be spliced within 250 feet (75 m) of another splice.

Tightening of individual cables shall be accomplished by mechanical means. Cables shall be stretched tight so that no sags occur between posts and so that, in the opinion of the Engineer, the finished installation presents a satisfactory appearance.

b. Wire Rope Safety Barrier.
The Contractor shall install wire rope safety barrier according to the manufacturer's recommendations. The barrier shall be tensioned according to the manufacturer's recommendations at the time of installation, and then checked and adjusted approximately 3 weeks after installation.

At least one turnbuckle per 1000 foot (300 meter) strand shall be included to allow for tensioning of the cables. For installations less than 1000 feet (300 meters) in length, one turnbuckle per strand shall be included near the center of the installation to allow for tensioning of the cables.

Concrete post foundations shall be constructed in accordance with Article 2505.03, B, 4.

3. Posts.
Posts shall be driven in a manner that does not damage the post. Posts required to be set in prebored holes shall be backfilled with material removed or other suitable soil. Backfill shall be placed in lifts not exceeding 4 inches (100 mm) and thoroughly compacted before the next lift is placed.

Regardless of the method of setting posts, the posts shall be firm, plumb, and at the location, spacing, and elevation designated.

4. End Anchors and Terminals.
End anchors and terminal devices of the type shown in the contract documents shall be installed.

Concrete required for end anchors shall be cast-in-place. Concrete shall be Class C in accordance with Section 2403, except air content may vary from 4% to 7%. Exposed concrete shall be finished as directed by the Engineer. Class C can be subjected to loading of the rail in 3 calendar days. Concrete with high early strength may be necessary to meet requirements of Article 2505.05. The Contractor may furnish Class M concrete at no additional cost to the Contracting Authority. Concrete with these proportions can also be subjected to loading in 3 calendar days.

5. Guardrail Markers and Barrier Markers.
Guardrail markers and barrier markers of the required type meeting the requirements of Article 4186.0812 shall be installed when indicated in the contract documents.

6. Delineators and Object Markers.
Delineators and object markers of the required type meeting the requirements of Article 4186.12 shall be installed when indicated in the contract documents.

2505.04 RESERVED.

2505.05 LIMITATIONS.
Attachments to new concrete or to anchor bolts set in epoxy resin shall not be stressed until the new concrete or epoxy resin has attained an age of 3 calendar days. This time requirement may be lengthened by the Engineer during cool weather.

Grading work, if required, shall be completed prior to removal of any existing guardrail or installation of new guardrail.

When a roadway is open to traffic during construction, guardrail installations shall be completed within 5 working days from the day the structure, barrier rail, pavement, shoulder, or whichever is the controlling item of work, is sufficiently completed to allow guardrail installation. In areas where guardrail construction is not restricted by other construction, removal of existing guardrail, if any, and construction of new guardrail, except for end anchors requiring concrete, shall be completed on the same working day. Beam rail shall be fully connected to all posts. Guardrail with end anchors requiring concrete shall be ended with a Type E Terminal Section, a Type II Barricade and a Type A Warning Light, until the final anchor is completed. Concrete for the final end anchor shall be placed no later than the next working day.

When a roadway is closed to public traffic for construction, all guardrail installations shall be completed before opening the road to traffic.

On a roadway that is open to traffic during guardrail construction, each guardrail installation exceeding the 5 working day completion requirement will be subject to a $100 per working day contract price adjustment.

2505.06 METHOD OF MEASUREMENT.

A. Removal of Guardrail.
The Engineer will measure the length of the formed steel beam guardrail to be removed in linear feet (meters) to the nearest 0.1 foot (0.1 m), by measuring along the front of the rail from bolt hole to bolt hole.

The Engineer will measure the length of the cable guardrail to be removed in linear feet (meters) to the nearest 0.1 foot (0.1 m), by measuring along the front of one of the three cables with no deductions for turnbuckles or compensating devices.

B. Installation of Guardrail.
The quantity of steel beam and cable guardrail installed for which payment will be made will be the quantity shown in the contract documents. This will be the sum of the A, T, and H distances shown in the project plans. Extra Guardrail lapped due to the Adjustment Section will be paid for in increments of 6.25 feet (1.91 m).

The cable guardrail quantity will be calculated using one of the cables of cable guardrail, with no deductions for turnbuckles or compensating devices. Any changes in the installed length must be approved by the Engineer. This will also include the length of installations continued across a bridge.

C. Beam Guardrail End Anchors and Terminal Devices.
The Engineer will count the quantity of each type of beam guardrail end anchors and terminal devices constructed. Installations continued across a bridge will not be counted as end anchors.

D. Cable Guardrail End Anchors.

1. Three Cable Guardrail.
The Engineer will count the quantity of end anchors constructed.

2. Wire Rope Safety Barrier.
The Engineer will count the quantity of end anchors constructed.

2505.07 BASIS OF PAYMENT.
Payment for guardrail will include the furnishing of all materials, equipment, tools, and labor necessary to complete the removal and installation of the guardrail, including excavation and backfilling. However, excavation in unexpected rock will be paid for as extra work in accordance with Article 1109.03. Unexpected rock will be considered as rock encountered during excavation that was not visible from the roadway and was not indicated in the contract documents. The Engineer may adjust the payment for guardrail in accordance with Article 2505.05.

A. Removal of Guardrail.
The Contractor will be paid the contract unit price per linear foot (meter) for removal of guardrail, including formed steel beam, thrie-beam, cable guardrail, end anchors, and terminals. This payment will include hauling salvaged material to the stockpile site. Backfill of post and end anchor footing holes will be incidental.

Payment for nested formed steel beam and thrie-beam will be included in the contract unit price. For formed steel beam and thrie beam guardrail the number of posts, spacer blocks, object markers, delineators, guardrail markers, barrier markers, offset brackets, end anchors, terminals, and remaining hardware will be incidental to the item.

For cable guardrail the number of posts, hook bolts, turnbuckles, compensating devices, end anchors, and remaining hardware will be incidental to the item.

B. Installation of Guardrail.
The Contractor will be paid the contract unit price per linear foot (meter) for the installation of guardrail, including formed steel beam, thrie-beam, and cable guardrail.

Payment for nested formed steel beam and thrie-beam shall be included in the contract unit price. The number of posts, spacer blocks, object markers, delineators, guardrail markers, barrier markers, offset brackets, and remaining hardware shall be incidental to the item.

For cable guardrail the number of posts, hook bolts, turnbuckles, compensating devices; concrete; and remaining hardware will be incidental to the item.

C. Beam Guardrail End Anchor and Terminal Devices.
The Contractor will be paid the contract unit price for each type of beam guardrail end anchor or terminal device.

D. Cable Guardrail End Anchor.

1. Three Cable Guardrail.
The Contractor will be paid the contract unit price for each end anchor.

2. Wire Rope Safety Barrier.
The Contractor will be paid the contract unit price for each end anchor.