M 41-10 Page 8-65 Guardrail 8-118-11 Guardrail
8-11.1 Description
This Work consists of constructing, modifying, removing, and resetting guardrail and anchors of the kind and type specified in accordance with the Plans, these Specifications, and the Standard Plans in conformity with the lines and grades as staked.
8-11.2 Materials
Materials shall meet the requirements of the following sections: Beam Guardrail 9-16.3 Rail Element 9-16.3(1) Posts and Blocks 9-16.3(2) Galvanizing 9-16.3(3) Hardware 9-16.3(4) Anchors 9-16.3(5)
8-11.3 Construction Requirements
8-11.3(1) Beam Guardrail
8-11.3(1)A Erection of Posts
Posts shall be set to the true line and grade of the Highway after the grade is in place and compaction is completed. If the ends of a section of guardrail are curved outward or downward, the posts shall be set to accommodate the curve. The length of posts and post spacing shall be as shown in the Plans. Posts may be placed in dug or drilled holes. Ramming or driving will be permitted only if approved by the Engineer and there is no resulting damage to the pavement, shoulders, and adjacent slopes. In broken rock embankments, the pre-punching of holes will be permitted only prior to final Shoulder or median compaction, surfacing, and paving. When there is an underground conflict such as a utility line, drainage structure, or other type of obstruction the Contractor may submit an RFI in accordance with Section
1-05.1(2) for omission of a post(s). Posts may be omitted from a Type 31 guardrail run
every 56.25-feet (or every 9th post with standard 6.25-foot post spacing) on a guardrail run, however there are restrictions on omitting posts depending on the proximity to anchors, transitions, location of posts in relation to the slope and proximity to other specialty guardrail configurations. RFIs submitted for omission of posts shall detail proximity to the obstruction, fixed objects, roadway features, and other guardrail features such as transitions or anchors. In locations where posts are installed through asphalt or concrete pavement, first install openings in the pavement material called leave-outs. The leave-out opening shall either be a 15” x 15” square or a 15” diameter circle. Install the posts aligned centered in the leave-out opening except that a minimum 7” space from the back edge of the leave-out to the back of the post shall be provided. Backfill around the post in the leave-out with base course material. Tamp backfill manually so that the top of the compacted backfill is 1/2” below the pavement surface. Fill the remaining 1/2” of the leave-out with a polymer modified asphalt mastic that is level with the pavement surface. The polymer modified asphalt mastic shall meet the material requirements of Section 5-03.2 and be installed as specified in Section 5-03.3 . Payment for this Work shall be incidental to and included in the various guardrail items in the Contract. Rail elements shall be attached to the posts during the same working shift or protected by a method approved by the Engineer. Page 8-66 M 41-10
8-11 Guardrail8-11.3(1)B Erection of Rail
All metal work shall be fabricated in the shop. No punching, cutting, or welding shall be done in the field, except that holes necessary when additional posts are required or for special details in exceptional cases may be drilled in the field when approved by the Engineer. The rail shall be erected so that the bolts at expansion joints will be located at the centers of the slotted holes. All holes shall be painted with two coats of paint conforming to Section 9-08.1(2)B . Rail plates shall be assembled with the splice joints lapping in the direction of the traffic. When nested W-beam or thrie beam is specified, two sections of guardrail, one set inside of the other shall be installed. The inside and outside rail elements shall not be staggered. Galvanized steel rail plates shall be fastened to the posts with galvanized bolts, washers, and nuts of the size and kind shown in the Plans. All bolts, except where otherwise required at expansion joints, shall be drawn tight. Bolts through expansion joints shall be drawn up as tight as possible without being tight enough to prevent the rail elements from sliding past one another longitudinally. Bolts shall be sufficiently long to extend at least ¼ inch beyond the nuts. Except where required for adjustments, bolts shall not extend more than ½ inch beyond the nuts.
8-11.3(1)C Terminal and Anchor Installation
All excavation and backfilling required for installation of anchors shall be performed in accordance with Section 2-09.3 . In locations where guardrail anchors are installed on asphalt or concrete pavement, construct leave-outs around the anchor posts in accordance with Section 8-11.3(1)A . Bolts shall be tightened to the tension specified. The anchor cable shall be tightened sufficiently to eliminate all slack. When tightening, the anchor cable shall be restrained to prevent twisting of the cable. When foundation tubes used with the Wood Breakaway Post are driven, they shall be driven prior to installing the wood post. Type 2 concrete anchors may either be precast or cast-in-place at the option of the Contractor. Assembly and installation of Beam Guardrail Non-flared Terminals for Type 31 guardrail shall be supervised at all times by a manufacturer’s representative, or an installer who has been trained and certified by the manufacturer within the last 5 years and for the specific device(s) being installed. A copy of the installer’s certification shall be provided to the Engineer prior to installation. Assembly and installation shall be in accordance with the manufacturer’s recommendations. The manufacturer’s representative or certified installer shall complete a manufacturer’s terminal assembly/inspection checklist for each terminal installed. The original completed checklist, signed by the manufacturer’s representative or certified installer, shall be provided to the Engineer on the same day that the terminal installation is completed. When the manufacturer allows it, guardrail terminals may be installed on asphalt or concrete pavement. Guardrail terminals installed on asphalt or concrete pavement shall have leave-outs constructed around the posts. Leave-outs shall be constructed in accordance with Section 8-11.3(1)A . Beam Guardrail Non-flared Terminals for Type 31 guardrail shall meet the crash test and evaluation criteria in the Manual for Assessing Safety Hardware (MASH). M 41-10 Page 8-67 Guardrail 8-118-11.3(1)D Removing Guardrail and Guardrail Anchor Removal of the various types of guardrail shall include removal of the rail, cable elements, hardware, and posts, including transition sections, expansion sections, terminal sections and the rail element of anchor assemblies. Removal of the various types of guardrail anchors shall include removal of the anchor assembly including concrete bases, rebar, steel tubes, and all other appurtenances in the anchor assembly. All holes resulting from the removal of the guardrail posts and anchors shall be backfilled with granular material in layers no more than 6 inches thick and compacted to a density similar to that of the adjacent material. The removed guardrail items shall become the property of the Contractor. The embedded anchors attaching guardrail posts and guardrail terminal sections specified for removal to existing concrete Structures shall be removed to a minimum of 1 inch beneath the existing concrete surface. The void left by removal of the embedded anchors shall be coated with epoxy bonding agent and filled with mortar conforming to Section
9-20.4(2) The epoxy bonding agent shall be Type II, conforming to Section 9-26.1 , with
the grade and class as recommended by the epoxy bonding agent manufacturer.
8-11.3(1)E Raising Guardrail
For raising guardrail anchors and raising guardrail terminals, the existing guardrail posts shall be raised to attain the guardrail height shown in the Plans, measured from the top of the rail to the finished Shoulder surface. The material around each post shall be tamped to prevent settlement of the raised post. For raising all other guardrail, the existing guardrail posts shall not be raised to attain the new mounting height. The existing rail elements and blocks shall be removed from the guardrail post. The Contractor shall field drill new ¾-inch diameter holes in the existing posts to accommodate the ⅝-inch diameter button head bolts. When existing guardrail posts are galvanized steel, the new drill holes shall be painted with two coats of paint, conforming to Section 9-08.1(2)B . The Contractor shall then reinstall the guardrail block and rail element at the new mounting height shown in the Plans, measured from the top of the rail to the finished Shoulder surface. The new position of the top of the block shall not be more than 4 inches above the top of the guardrail post. The Contractor shall remove and replace all existing guardrail posts and blocks that are not suited for re-use, as staked by the Engineer. The void caused by removal of the post shall be backfilled and compacted. The Contractor shall then furnish and install a new guardrail post to provide the necessary mounting height.
8-11.3(1)F Removing and Resetting Beam Guardrail
The Contractor shall remove and reset existing guardrail posts, rail element, hardware and blocks to the location shown in the Plans. The mounting height of reset rail element shall be at the height shown in the Plans. The Contractor shall remove and replace all existing guardrail posts and blocks that are not suited for re-use, as staked by the Engineer. The void caused by the removal of the post shall be backfilled and compacted. The Contractor shall then furnish and install a new guardrail post to provide the necessary mounting height.
8-11.3(1)G Vacant
8-11.3(1)H Guardrail Construction Exposed to Traffic
Sections of beam guardrail that are removed for modification shall be completely reassembled back in place within 5 calendar days of the date the guardrail is removed. The Contractor’s operations shall be conducted in such a manner that fixed objects previously protected by barrier or newly installed shall be protected from traffic at all times by a method approved by the Engineer. Page 8-68 M 41-10
8-11 GuardrailRail elements shall be attached to the posts during the same working shift or protected by
a method approved by the Engineer. At the end of each work shift, guardrail sections having an exposed end toward oncoming traffic shall have a Type C terminal end section bolted securely in place.
8-11.4 Measurement
Measurement of beam guardrail and beam guardrail with long posts will be by the linear foot measured along the line of the completed guardrail, including expansion section, and will also include the end section for F connections. Measurement of beam guardrail transition sections will be per each for the type of transition section installed. End sections, except for F connections, will be considered part of the transition section and will be included in the measurement of the transition section. Measurement of beam guardrail _____ terminal will be per each for the completed terminal. Measurement of beam guardrail Type 31 buried terminal Type 2 will be per linear foot for the completed terminal. Measurement of beam guardrail anchor Type 11 will be per each for the completed anchor, including the attachment of the anchor to the guardrail. Measurement of removal of guardrail will be by the linear foot measured along the line of guardrail removed including transition sections, expansion sections, guardrail anchor rail elements and terminal sections. Measurement of removal of guardrail anchors will be per each. Measurement of raising beam guardrail and removing and resetting beam guardrail will be by the linear foot measured along the line of guardrail actually raised or removed and reset. This will include transition sections, expansion sections, anchors, and terminal sections. Measurement of beam guardrail post used for raising beam guardrail will be per each. Measurement of beam guardrail blocks used for raising beam guardrail will be per each.
8-11.5 Payment
Payment will be made for each of the following Bid items that are included in the Proposal: “Beam Guardrail Type ____”, per linear foot. “Beam Guardrail Type 1- ____ Ft. Long Post”, per linear foot. “Beam Guardrail Type 31-____ Ft. Long Post”, per linear foot. The unit Contract price per linear foot for “Beam Guardrail Type____”, “Beam Guardrail Type 1-____ Ft. Long Post”, and “Beam Guardrail Type 31-____ Ft. Long Post”, shall be full payment for all costs to obtain and provide materials and perform the Work as described in Sections 8-11.3(1)A and 8-11.3(1)B , including costs for additional rail elements when nested rail is required, when connections to concrete masonry Structures are required, and when constructing leave-outs for guardrail installed in asphalt or concrete pavement. “Beam Guardrail Transition Section Type ____”, per each. The unit Contract price per each for “Beam Guardrail Transition Section Type ____” shall be full payment for all costs to obtain and provide materials and perform the Work as described in Sections 8-11.3(1)A and 8-11.3(1)B , including costs for additional rail elements when nested rail is required, when connections to concrete masonry Structures are required, and when constructing leave-outs for guardrail transitions installed in asphalt or concrete pavement. M 41-10 Page 8-69 Guardrail 8-11“Beam Guardrail Anchor Type 11”, per each. “Beam Guardrail ____ Terminal”, per each. The unit Contract price per each for “Beam Guardrail Anchor Type ____” and “Beam Guardrail ___ Terminal” shall be full payment for all costs to obtain and provide materials and perform the Work as described in Section 8-11.3(1)C including costs when constructing leave-outs for guardrail terminals or anchors installed in asphalt or concrete pavement. “Beam Guardrail Type 31 Buried Terminal Type 2”, per linear foot. The unit Contract price per linear foot for “Beam Guardrail Type 31 Buried Terminal Type 2” shall be full payment for all costs to obtain and provide materials and perform the Work as described in Section 8-11.3(1)C , including costs when constructing leave- outs for guardrail terminals or anchors installed in asphalt or concrete pavement. “Removing and Resetting Beam Guardrail”, per linear foot. The unit Contract price per linear foot for “Removing and Resetting Beam Guardrail” shall be full payment for all costs to perform the Work as described in Section
8-11.3(1)F , except for replacement posts and blocks.
“Raising Existing Beam Guardrail”, per linear foot. The unit Contract price per linear foot for “Raising Existing Beam Guardrail” shall be full payment for all costs to perform the Work as described in Section 8-11.3(1)E , except for replacement posts and blocks. “Removing Guardrail”, per linear foot. The unit Contract price per linear foot for “Removing Guardrail” shall be full payment for all costs to perform the Work as described in Section 8-11.3(1)D . “Removing Guardrail Anchor”, per each. The unit Contract price per each for “Removing Guardrail Anchor” shall be full payment for all costs to perform the Work as described in Section 8-11.3(1)D , including rail removal, if there isn’t a Bid item for Removing Guardrail in the run of guardrail connecting to the anchor. “Beam Guardrail Post”, per each. “Beam Guardrail Block”, per each. The unit Contract price per each for “Beam Guardrail Post” and “Beam Guardrail Block” shall be full payment for all costs for furnishing and installing new posts and blocks, removal and disposal of the existing posts and blocks, and backfilling and compacting the void created by post removal when new posts or blocks are required for the Work described in Sections 8-11.3(1)E and 8-11.3(1)F .