8-44 Payment will be made under:
Pay Item Pay Unit Remove and Reset Existing Guardrail Linear Foot Remove and Reset Existing Guiderail Linear Foot
865-1 Description
Construct cable guiderail in accordance with the contract and at the locations designated in the plans or as directed by the Engineer . Install additional double faced cable guiderail posts without cable at median hazards as shown in Roadway Standard Drawings .
865-2 Materials
Refer to Division 10. Item Section Hardware 1046 -4 Portland Cement Concrete, Class A 1000 Posts 1046 -3 Precast Concrete Anchors 1077 Rail Elements 1046 -2 Select Material, Class VI 1016 Manufacture cable in accordance with AASHTO M 30, Type I, Class A. The cable shall be pre-inspected at the producer ’s facility before shipment. Additional guiderail posts shall be double faced guiderail intermediate posts.
865-3 Construction Methods
Erect the rail elements to produce a smooth continuous rail paralleling the line and grade of the highway surface or as shown in the plans. Posts may be power driven or set by hand. Protect the top of ste el posts by a suitable driving cap if power driven. If set by hand, dig post holes to the depth and at the locations shown in the plan s. Thoroughly ram the bottom of the post holes so that the posts will have a stable foundation. Set the posts plumb and accurately space and align. Backfill the post holes in 6 inch layers with suitable material and thoroughly compact by tamping or puddling. Where rock interferes with the proper installation of the post, excavate a shaft in the rock at least 9 inches wide , parallel to the roadway, by 23 inches long, perpendicular to the roadway, and 24 inches deep. Place the post against the roadside edge of the shaft and fill in behind the post with Class VI select material , up to the top elevation of the rock. Fill the remainder of the hole with earth material. Where timber posts are to be driven in fill slopes 1 .5:1 or steeper and the fill height is 15 f eet or more, auger a 6 inch diameter pilot hole to the full depth of the post before driving. When guiderail is being constructed near traffic, conduct operations to constitute the least hazard to the public. Schedule and conduct operations to construct and complete each individual continuous guiderail installation in the least possible time. Do not begin work on any s ection of new guiderail until preparations are made to fully complete the installation of the section as a continuous operation. Once work begins on a section, pursue the work to its completion unless inclement weather or other conditions beyond the contr ol of the Contractor interfere with the work. Begin attachment of the cable elements at the approach end of the guiderail and continue in the same direction as the movement of traffic.