624.01 Description.
CABLE GUIDERAIL
624.01 Description.
This Section shall cover the work of furnishing and installing posts, anchors, cables and miscellaneous hardware required for the constructi on of tensioned cable guiderail.
624.02 Materials and Design.
The cable guiderail system shall be a system accepted by ALDOT and determined by FHWA as passing NCHRP Report 350 or the AASHTO Manual for Assessing Safety Hardware (MASH) requirements for the Test Level, post spacing, slope, placement location, and other details as shown on the plans. The cable guiderail system shall be designed by the manufacturer, specific to the project site, to limit the deflection to the design value shown on the plans. Th e manufacturer’s design shall take into consideration the locations of the cable guiderail and cable guiderail runs as shown on the plans. The manufacturer shall design anchors for the beginning and ending termini of each cable guiderail run as shown in t he plans and shall determine if intermediate anchors within each cable guiderail run are necessary to limit the deflection to the design value.
624.03 Construction Requirements.
a.Submittal of the Design and Details of the Proposed Cable Guiderail Syste m. The Contractor shall submit 5 sets of copies of the manufacturer’s system design and details to the Engineer within 14 calendar days after the date of the "Notice to Proceed". The contract documents may include information regarding the existing soil, but it is the Contractor’s responsibility to provide the cable guiderail system manufacturer with any geotechnical information needed to design the cable barrier system. The Contractor shall include the manufacturer’s required soil parameters and the resul ts of the geotechnical investigations in the submittal package. The submittal shall include a written statement from the cable guiderail manufacturer that the proposed cable guiderail system’s anchor spacing is adequate to limit the deflection to the des ign value shown in the plans. The manufacturer’s statement shall be signed and stamped by a Professional Engineer registered in the State of Alabama. If clarifications are required, one set of the submittal will be returned to the Contractor with comments for clarification. The Contractor will be allowed 14 calendar days to provide clarification of the submittal. The Contractor shall submit 5 sets of copies of the system design and details to the Engineer in each response to the request for clarification by the Engineer. The Engineer will not approve the submittal but will review the submittal for completeness. The Engineer will distribute copies of the submittal when the review is complete.
b.Contractor’s Responsibility for System Installation. The Contractor shall be fully responsible for insuring that the cable guiderail system is constructed in compliance with the cable guiderail manufacturer’s recommendations and requirements.
c.Cable Guiderail Manufacturer’s Representative. A representati ve of the cable guiderail manufacturer shall be present at the site of the installation during the various phases of installation to insure that the Contractor installs all components of the cable guiderail system in accordance with the manufacturer's requ irements. The various phases of installation include anchor installation, line post installation, attachment to guardrail, splicing cable, cable tensioning, etc. The manufacturer's representative shall provide training for Departmental personnel applicable to the installation and maintenance procedures for all features of the guiderail. The manufacturer’s representative may also be required to provide training for local first responders regarding precautions to be taken when working in and around crash sit es involving the guiderail. The training sessions will be conducted at a location determined by the Engineer and will be of sufficient length to address all training topics.
d.Letter of Compliance. Within five calendar days after the completion of the installation of all components of the cable guiderail system, the Contractor shall submit a letter from the manufacturer to the Engineer stating that all components of the cable guiderail system, foundations, and all geotechnical conditions are in
626.03 Construction Requirements.
accordance with the project specific design and manufacturer’s recommendations and requirements. The cable guiderail system will not be accepted by the Department until a satisfactory letter of compliance has been received.
624.04 Method of Measurement.
a.Cable Guiderail. The cable guiderail will be measured in linear feet {meters} exclusive of that length of guiderail which is within the limits of measurement for the guiderail anchors. Measurement will be made from center to center of the outermost transit ion posts. No separate measurement will be made of any cable, rail, post, offset block, concrete, hardware, or any other component of a cable guiderail.
b.Cable Guiderail Anchors. The cable guiderail anchors will be measured per each. An anchor will i nclude all components of the cable guiderail from the terminal post to the center of the outermost transition post. No separate measurement will be made of any intermediate anchors that may be required by the manufacturer to limit the deflection to the des ign value. No separate measurement will be made of any cable, rail, post, offset block, concrete, hardware, or any other component of a cable guiderail anchor.
624.05 Basis of Payment.
a.Unit Price Coverage. The contract prices for the cable guiderail a nd cable guiderail anchors shall be full compensation for submittals, soil sampling and testing, design of the anchors and sockets, all posts, foundations, hardware, materials, equipment, tools, labor, training, and incidentals necessary to complete the work. The contract price for Cable Guiderail shall also be full compensation for all intermediate anchors and for furnishing the manufacturer's recommended tension measuring device to become the property of the Department.
b.Payment will be made under Item No.: 624-A Cable Guiderail - per linear foot {meter} 624-B Cable Guiderail Anchor – per each SECTION 626 CONCRETE MEDIAN STRIP
626.01 Description.
This Section shall cover the work of constructing a concrete median strip of the size, shape, and dimensions shown on the plans, at the locations, to the lines and grades shown on the plans or designated.
626.02 Materials.
All materials furnished for use shall conform to the requirements of Division 800, Materials, and Section 501.
626.03 Construction Requirements.
Concrete used in the construction of the median strip shall be Class A concrete complying with the requirements of Section 501, except that when the median strip is placed on concrete pavement, the concrete may be of the same type used in the pavement. The median strip shall be constructed on any approved surface, normally a subbase, base, or pavement layer. Forming, placing, finishing, and curing of the concrete shall be in accordance with the provisions of
Article 623 — 03.
Expansion joints shall be provided as specified in Subarticle 618.03(g) for concrete driveways, unless shown otherwise by the plans or directed by the Engineer.
Source: Alabama Standard Specifications for Highway Construction, 2022 Edition. Pages 511–511 of 934.