606Guardrail, Crashworthy End Terminals, One-Strand Access Restraint Cable and High-Tension Guard Cable

606 GUARDRAIL, CRASHWORTHY END TERMINALS, ONE-STRAND ACCESS RESTRAINT CABLE AND HIGH-TENSION GUARD CABLE

606.1Description. This work shall consist of furnishing and installing guardrail, crashworthy end terminals,

one-strand access restraint cable or high-tension guard cable as shown on the plans or as directed by the engineer.

606.2Material. All material shall be in accordance with Division 1000, Material Details, and specifically as

follows: Item Section Concrete 501 Guardrail, End Terminals, Crash Cushions, One-Strand Access Restraint Cable and High-Tension Guard Cable 1040 606.2.1 Concrete. Concrete shall be placed, finished and cured in accordance with Sec 703. 606.2.2 Cold Weather. During cold weather, the weather limitations of Sec 502 will apply to concrete work. 606.2.3 Aesthetic Guardrail. When specified, aesthetic guardrail shall be in accordance with MASH 2016, Test Level 3 criteria and shall be of new stock. End terminals and crash cushions for aesthetic guardrail shall be fabricated and installed in accordance with Sec 606.30.3.

606.3Construction Requirements.

606.3.1 General. Work on guardrail or guard cable removal and replacement when the adjacent travel or auxiliary lane is open to traffic during non-working hours shall adhere to the following requirements:

attached to all installed posts at the end of each work day.

606.3.1.1 If guardrail or high-tension guard cable cannot be replaced the same day as removal, traffic control measures meeting the approval of the engineer shall be provided. The contractor will not be compensated for any additional traffic control items required to perform this work. In all cases, the contractor shall ensure that the guardrail or guard cable installation is fully anchored before opening the adjacent lane to traffic. 606.3.1.2 The shoulders and slopes shall be in accordance with all standards shown on the plans or shall be as directed by the engineer before the installation of any guardrail, guard cable or end treatments. 606.3.2 Field Repair of Galvanizing. Galvanized material shall be handled in a manner to avoid damage to the surface. No punching, drilling, cutting or welding will be permitted after galvanizing, except as approved by the engineer to provide for lapped beams, or for changes in location of splices necessitated by field clearances. Any galvanized material on which the galvanizing has been damaged will be rejected or may, with the engineer’s approval, be repaired in accordance with Sec 1080. 606.3.3 Posts for Guardrail and One-Strand Access Restraint Cable. 323 606.3.3.1 Posts may be wood or steel as shown on the plans. The same material shall be used for all new installations within a single project, except for end treatments. If the project requires an extension of existing guardrail, the new post material for the extension shall match the existing material. 606.3.3.2 Wood posts for end anchors shall be installed as shown on the plans. 606.3.3.3 Posts may be installed by either drilling or driving. 606.3.3.3.1 Posts installed by drilling shall have sufficiently sized holes to permit thorough compaction of backfill material around the posts. The backfill material shall be compacted in layers not exceeding 12 inches high. 606.3.3.3.2 Posts installed by driving may be driven by a power hammer or any other method approved by the engineer. Any mushrooming on the top of the post shall be removed. Damaged zinc coating on galvanized posts shall be field repaired in accordance with Sec 1081. If, in the judgment of the engineer, the exposed portion of a wood post is split or the driving process noticeably worsens the check cracking, the post shall be replaced by the contractor at the contractor’s expense.

606.4Basis of Payment. The accepted quantities of grading and drainage at barrier locations will be paid for at

the contract unit price for each of the pay items included in the contract.

606.10.1 Description. This work shall consist of furnishing and installing guardrail as shown on the plans or as

directed by the engineer.

.2 Construction Requirements

.2.1 Beams. Beams shall be spliced by lapping in the direction of traffic. The use of 12’-6” or 25-foot

sections of beam rails and channels, if required, will be permitted where true line and grade can be maintained.

.2.2 End Anchors. End anchors shall be installed on ends of guardrail runs where crashworthy end

terminals are not required.

.2.3 Delineators. Delineators shall be placed on all guardrail located 2 feet or less from the edge of the

shoulder. Delineators shall be spaced at 50-foot intervals.

.2.3.1 Material. All material shall be in accordance with Division 1000, Material Details, and specifically

as follows: Item Section Delineators 1065

.2.3.2 Construction Requirements

.2.3.2.1 Delineator reflector colors shall correspond with pavement marking. Delineators shall be sheeted

on one side, facing oncoming traffic, unless otherwise specified. Where guardrail divides opposing lanes of travel, the delineators shall have retro-reflective sheeting on both sides corresponding to adjacent pavement markings. Guardrail located on off ramps shall have red reflective sheeting placed on the reverse side of the reflector. The use of the red sheeting on the back side of guardrail delineators may be used wherever there is a need to discourage wrong way driving. Guardrail located on two lane roads shall have retro-reflective sheeting on both sides corresponding to the adjacent pavement markings. If there are not edgelines present, white retro- reflective sheeting shall be used.

.2.3.2.2 Delineators shall be installed according to manufacturer’s recommendations or as shown on the

plans. 324

.2.3.2.3 Any damaged or missing delineators shall be replaced by the contractor at the contractor’s

expense.

.3 Method of Measurement

.3.1 Measurement of guardrail will be made to the nearest 1/2 linear foot for each increment along a line

passing through the centerline of each post, and totaled to the nearest linear foot for the sum of the increments in the contract. The length will be measured separately for each guardrail type, as shown on the plans, excluding bridge anchor sections, end anchors, transition sections and bullnose guardrail systems. Bridge anchor sections, end anchors, transition sections and bullnose guardrail systems will be measured per each item furnished and installed.

.3.2 Measurement for MGS Guardrail will be made to the nearest ½ linear foot for each segment

measured along the center of the W-beam rail from the centerline of the mid-span lap splice to the centerline of the mid-span lap splice totaled to the nearest linear foot for the sum of the increments in the contract. The length will be measured for each type of guardrail, as shown on the plans, excluding vertical barrier transitions, end terminals, MGS height and block transitions, MGS long span, and embedded anchor transitions. Vertical barrier transitions, end terminals, MGS height and block transitions, MGS long span, and embedded anchor transitions will be measured per each item furnished and installed.

.4 Basis of Payment. The accepted quantities of guardrail, bridge approach transitions, end anchors,

MGS height and block transitions, MGS Long Span Guardrail, and bullnose guardrail systems, complete in place, will be paid for at the contract unit price for each of the pay items included in the contract. No direct payment will be made for end sections or terminal connectors. No direct payment will be made for setting posts in rock. No direct payment will be made for guardrail delineators provided on new guardrail. Delineators specified for installation on existing guardrail will be measured and paid for per each. SECTION 606.20 BLANK. SECTION 606.30 CRASHWORTHY END TERMINALS.

606.30.1 Description. This work shall consist of furnishing and installing crashworthy end terminals as shown

on the plans or as directed by the engineer.

.2 Material

.2.1 Equipment and material shall be of new stock and in accordance with Sec 1040

.2.2 All Type A end terminal installations shall be a minimum of 50 feet long. Additional Type A or MGS

guardrail shall be provided by the contractor, at the contractor's expense, to increase the Type A end terminal to a length of 50 feet. If the end terminal is to be installed on MGS rail, the additional guardrail supplied shall be MGS rail.

.3 Construction Requirements. End terminals and crash cushions shall be fabricated and installed in

accordance with the manufacturer's approved shop drawings, recommendations and as shown on the plans. Any units damaged during the term of the contract shall be replaced immediately at the contractor's expense.

.3.1 Where a specific end terminal or crash cushion is shown by product name, that unit shall be used as

shown on the plans. No substitutions will be permitted without prior approval from the engineer.

.3.2 The contractor shall not install flared Type A end terminals in medians or on curbs

.3.3 The contractor shall not install Type B end terminals on paved surface locations, unless the location

is temporary and the paved area is to be resurfaced after removal of the system.

.3.4 The contractor may use Type C, D, and E end terminals where Type B units are specified or shown

on the plans. 325

.3.5 Crashworthy end terminals located 12 feet or less from the edge of the traveled way shall be

furnished with a modified Type 3 object marker. The marker size, shape, method of attachment and placement shall be approved by the engineer prior to installation.

.4 Method of Measurement. Measurement for crashworthy end terminals will be made for each unit

assembled, installed and complete in place. Grading for crashworthy end terminals will be measured in accordance with Sec 203 when roadway and drainage excavation is included in the contract, otherwise grading will be measured in accordance with Shaping Slopes, Class III or as directed on plans.

.5 Basis of Payment. The accepted quantities of Type A, B, C, D and E crashworthy end terminals,

complete in place, will be paid for at the contract unit price. Payment will be considered full compensation for complete installation including any backup assemblies or other items necessary for proper installation of the end terminal or crash cushion as required. Grading for end terminals will be paid for at the contract unit price for roadway and drainage excavation if included in the contract; otherwise it will be paid for as Shaping Slopes, Class III. If the contractor elects to use a flared Type A crashworthy end terminal, additional embankment as shown on the plans shall be provided at the contractor's expense. SECTION 606.40 ONE-STRAND ACCESS RESTRAINT CABLE.

606.40.1 Description. This work shall consist of furnishing and installing one-strand access restraint cable as

shown on the plans or as directed by the engineer.

.2 Construction Requirements. The cable shall be strung directly from the reel and pulled tight after the

initial anchoring. The cable shall then be attached to the second anchor assembly with all turnbuckles fully opened. The cable shall be completely anchored before attaching to the line posts.

.2.1 Line Posts. Posts shall be installed in accordance with Sec 606.3.3. All posts shall be aligned to a

tolerance of 1/4 inch for plumb and grade line.

.2.2 Anchor Assemblies. The specified type of anchor assembly shall be constructed at each end of a run

of guard cable. If intermediate end anchors are required, the cable assembly shall be overlapped as shown on the plans. The location of all intermediate anchor assemblies shall be determined by the contractor and approved by the engineer. Backfill shall be brought up level with the finished grade line.

.3 Method of Measurement. Measurement of one-strand access restraint cable will be made to the

nearest 1/2 linear foot for each increment, from center of end post to center of end post, and totaled to the nearest linear foot for the sum of the increments on the project.

.4 Basis of Payment. The accepted quantities of one-strand access restraint cable, end anchors, posts and

hardware, complete in place, will be paid for at the contract unit price for each of the pay items included in the contract. SECTION 606.50 HIGH-TENSION GUARD CABLE.

606.50.1 Description. This work shall consist of furnishing and installing high-tension guard cable. High-

tension guard cable systems shall be fabricated and installed in accordance with the manufacturer’s approved shop drawings, recommendations and as shown on the plans, or as directed by the engineer.

.2 Delineators. Delineator spacing and reflector colors shall be in accordance with Sec 606.10