9-11 Perform all excavation necessary for foundation construction to the elevations and dimensions
shown in the contract. Place concrete against undisturbed soil. Construct concrete sign foundations in accordance with Section 825. Construct either reinforced or plain Class A concrete foundations in accordance with the contract. Shape the tops of the foundations to conform to finished ground elevations such that water will not collect against the supports. No construction joints will be permitted. Form the top 6 inches of foundations by approved methods. Center the supports in the foundations, securely brace and hold in proper position and alignment during placement of the concrete. Provide an ordinary surface finish to the concrete.
902-4 Measurement and Payment
Reinforced and Plain Concrete Sign Foundations will be measured and paid as the computed number of cubic yards of concrete incorporated into the completed and accepted foundation. Computing the number of cubic yards of concrete will be done from the dimensions shown in the contract or from revised dimensions authorized by the Engineer, calculated to the nearest 1/100 of a cy . Such payment will include, but is not limited to, excavating, shoring, backfilling, forming, landscaping and other necessary tasks as required. No separate measurement and payment will be made for r einforcing steel for Reinforced Concrete Sign Foundations as the cost of such shall be included in the price per cubic yard for Reinforced Concrete Sign Foundations . Payment will be made under: Pay Item Pay Unit Reinfor ced Concrete Sign Foundations Cubic Yard Plain Concrete Sign Foundations Cubic Yard
903-1 Description
Furnish, fabricate, clear for sight distance and install ground mounted and barrier mounted signs supports. The types of supports covered by this section are: Breakaway steel beam sign supports Simple steel beam sign supports 3-lb steel U -channel support s 2-lb steel U -channel support s Barrier sign support assembly Wood supports Steel square tube support s
903-2 Materials
Refer to Division 10. Item Section Breakaway or Simple Steel Beam Sign Supports (W- or S-Shapes) 1094 -1(A) Ground Mounted Signs 1094 Hot Applied Joint Sealer 1028 -2 Organic -Zinc Repair Paint 1080 -7
9-12 Item Section
Signing Materials 1092 Steel Square Tube Supports 1094 -1(D) Steel U -Channel Support s 1094 -1(B & C)
903-3 Construction Methods
A.Location and Field Verification The support lengths and dimensions for steel and wood ground mounted supports shown in the contract are esti mated for project bid purposes. The Engineer or contract surveyor will establish the proper offset, longitudinal location; foundation elevation and S -dimension of each ground mounted and barrier mounted sign support. The Signing and Delineation Unit will issue a revision of the Sign Support Chart Sheet following receipt of field -verified S-dimensions. Order supports for ground mounted signs when the revised support lengths, dimensions and sizes have been determined an d the appropri ate plan revision is completed. Provide the proper vertical plumb, level and orientation of all signs and supports.
B.Clearing for Sign Sight Distance Clear vegetation in front of signs where necessary to achieve proper sight distance to the sign. The sight distance area includes the triangular region of land extending from the edge of the travel lane 800 f eet in advance of the sign to 4 f eet beyond the furthest edge of the sign from the travel lane. The Engineer will determine where clearing is required and the amount of clearing at the sign locations. Perform the clearing in accordance with Section 200.
C.Breakaway Steel Beam and Simple Steel Beam Fabricate and install the supports in accordance with the contract. Punch, cut or weld supports before galvanizing. Galvanize each component part in accordance with ASTM A123 before assembly. Provide supports that are uniformly straight to within 1/8 inch tolerance for pieces less than 20 f eet in length a nd 1/4 inch tolerance for pieces over 20 feet in length. Cut the upper and middle sections of breakaway supports from the same member. Bolt the hinge joint in the breakaway supports to ensure true alignment of the 2 sections. After bolting of hinge conne ctions make sure that the 2 sections are in the same position relative to each other, as before being cut. Completely assemble breakaway supports before erection. Provide supports that are plumb. Do not shim the supports. Take adequate care during erection of supports to prevent damage to the surface finish. Use 2 coats of an approved non-aerosol organic -zinc repair paint in touching up damaged areas on all galva nized materials.
D.Steel Supports
1.General Drive the support s to the required depth, being sure they are plumb. Drive the support s by hand or by mechanical means. Protect the support s with an appropriate driving cap. Concrete foundations are not required. In island applications, cored holes shall be to the soil depth. Replace any support that is bent, or otherwise damaged in driving. Do not weld supports in the field. Use 2 coats of an approved non-aerosol organic - zinc repair paint in touching up the tops of U -channel support s that may have been
9-13 damaged in driving. C ut ends of support s, frames , cross bracing and damaged areas
on these and all other galvanized materials. Any steel supports cut in the field shall have two coats of an approved non- aerosol organic -zinc repair paint. Use support s of sufficient length to permit the appropriate sign mounting height. Spliced support s are not permitted on new construction.
2.U-Channel Use 3 -lb galvanized steel U -channel support s for enhanced mile post signs and Types D, E and F signs. Use 2 -lb galvanized steel U -channel support s for mile post signs .
3.Perforated Square Tubing Use square tube support s in accordance with the contract.
E.Barrier Supports
1.Small Attach brackets and U -channel support s to the median or shoulder barrier for the erection of Type E or F signs or milemarkers in accordance with the contract.
2.Large Attach brackets, anchorage and pipe support s to the median or shoulder barrier for the erection of Type E signs in accordance with the contract.
F.Wood Supports Use wood supports in accordance with the contract. Replace any support that is damaged during erection. Breakaway wood supports shall be drilled in accordance with the contract. All wood supports larger than 4 inches x 4 inches that have not been drilled shall be behind guardrail.
903-4 Measurement and Payment
The supports , specified in these Standard Specification s, installed and accepted , will be measured for payment as follows: Supports, Breakaway Steel Beam and Supports, Simple Steel Beam will be measured and paid as the actual number of pounds of structural steel installed and accepted . The computed nominal weights shown in the final revised plans will be used in determining this quantity. Measurement will no t be made of the weight of nuts, bolts and washers that are part of the sign support, as they will be incidental to the work. Supports, 3- lb Steel U -Channel will be measured and paid as the actual number of linear feet of 3-lb steel U -channel support s inco rporated into the completed and accepted supports and assemblies. Measurements of length will be made to the nearest 1/10 of a foot. Supports, 2- lb Steel U -Channel will be measured and paid as the actual number of 2-lb steel U -channel support installed a nd accepted . Supports, Barrier (Small) will be measured and paid as the actual number of small barrier supports installed and accepted . Supports, Barrier (Large) will be measured and paid as the actual number of large barrier supports installed and accepte d. Supports, Wood will be measured and paid as the actual number of linear feet of wood support incorporated into the completed and accepted supports. Measurements of length will be made
Source: North Carolina Standard Specifications for Roads and Structures, 2024 Edition. Pages 403–405 of 857.