161-2.3 POSTS. Corner, brace, and gate posts shall be 21⁄2" x 21⁄2" x 4" minimum galvanized steel angle 7 feet long, as shown on the plans. Line posts shall be 11⁄4" x 11⁄4" x 1⁄2" minimum galvanized steel angle 7 feet long, as shown on the plans. Posts shall be of rail steel, A. S. T. M. Designation A-16, or hard grade billet steel, A. S. T. M. Designation A-15. Other sections of steel or metal posts may be used when approved by the engineer. 161-2.4 RAILS. Rails shall be 2" x 2" x 16" minimum galvanized steel angle 9' 11" long, as shown on the plans. Rails shall be of rail steel, A. S. T. M. Designation A-16; hard grade billet steel, A. S. T. M. Designation A-15; or structural steel, A. S. T. M. Designation A-7. 161-2.5 BRACES. Braces shall be 2" x 2" x 16" minimum galvanized steel angle 10′ 8%" long, as shown on the plans. Braces shall be of rail steel, A. S. T. M. Designation A-16; hard grade billet steel, A. S. T. M. Designation A-15; or structural steel, A. S. T. M. Designation A-7. 161-2.6 FITTINGS AND FASTENINGS. Fittings and fastenings shall be hot-dip galvanized steel as shown on the plans. 161-2.7 CONCRETE. Concrete shall be 1:22:5 mix of approved materials, placed in accordance with Item P-610. CONSTRUCTION METHODS 161-3.1 GENERAL. The fence shall be constructed in accordance with the details on the plans and as specified herein, with new materials, and all work shall be performed in a workmanlike manner satisfactory to the engineer. Prior to the beginning of the work, or upon the request of the contractor, the engineer will locate the position of the work by establishing and marking the property line or fence line. At locations of small natural or drainage ditches where it is not practical to conform the fence to the general contour of the ground surface, the contractor, when directed, shall span the opening below the fence with barbed wire fastened to stakes of such length as required. The new fence shall be permanently tied to the terminals of existing fences whenever required by the engineer. The finished fence shall be plumb, taut, true to line and ground contour, and complete in every detail. When directed, the contractor will be required to stake down the woven wire fence at several points between posts. When directed, in order to keep stock on adjoining property inclosed at all times, the contractor shall arrange the work so that construction of the new fence will immediately follow the removal of existing fences. The length of unfenced section at any time shall not exceed three hundred (300) feet, or such length that the stock can be kept in the proper field. The work shall progress in this manner and at the close of the working day the newly constructed fence shall be tied to the unremoved existing fence. Any openings in the fence shall not be left unguarded when stock is using the adjoining property. 161-3.2 CLEARING FENCE LINE. The site of the fence shall be sufficiently cleared of obstructions and surface irregularities shall be graded so that the fence will conform to the general contour of the ground. The fence line shall be cleared to a minimum width of two (2) feet on each side of the center line of the fence. This clearing shall consist of the removal of all stumps, brush, rocks, trees, or other obstructions which will interfere with proper construction of the fence. Stumps within the cleared area of the fence line shall be grubbed or excavated. The bottom of the fence shall be placed a uniform distance above ground, as specified in the plans. When shown on the plans, or as directed by the engineer, the existing fences which coincide with or are in a position to interfere with the new fence location, shall be removed by the contractor as a part of the construction work, unless such removal is listed as a separate item in the bid schedule. All holes remaining after post and stump removal shall be refilled with suitable soil, gravel, or other material acceptable to the engineer, and shall be compacted properly with tampers. The work shall include the handling and disposal of all material cleared, excavated or removed, regardless of the type, character, composition or condition of such material encountered. 161-3.3 INSTALLING POSTS. All posts shall be spaced as shown on the plans. Corner, brace, anchor, end, and gate posts shall be set in concrete bases as shown on the plans. The top of the base shall be slightly above the ground surface, trowel finished, and sloped to drain. Holes of full depth and size for the concrete bases for posts shall be provided even if blasting of rock or other obstructions is necessary. All line posts may be either driven, or set in dug holes, to a penetration of three (3) feet. All post setting shall be done carefully and to true alignment. Should dirt be removed for placing posts, anchor bars, flanges, etc., it shall be replaced, tamped, and levelled. When posts are driven, care shall be exercised to prevent marring or buckling of the posts. Damaged posts shall be replaced at the contractor's expense. No extra compensation will be made for rock excavation. Rock excavation shall not be grounds for extension of time. 161-3.4 BRACING. All corner, anchor, end, and gate posts shall be braced as shown on the plans. Anchor posts shall be set at approximately 500-foot intervals and braced to the adjacent posts. 161-3.5 INSTALLING WIRE. All barbed wire and woven wire shall be placed on the side of the posts away from the airport, or as directed, at the height indicated on the plans. The woven wire shall be carefully stretched and hung without sag and with true alignment, care being taken not to stretch the wire so tightly that it will break in cold weather or pull up corner and brace posts. All horizontal wires shall be fastened securely to each post by fasteners or clips designed for use with the posts furnished. The woven wire shall be wrapped around end, corner, and gate posts, and the ends of all horizontal wires shall be tied with snug, tight twists. The wire shall be secured to prevent slipping up and down the post. Barbed wire strands shall be stretched and each strand secured to each post to prevent slipping out of line or becoming loose. At end, corner, and gate posts the barbed wire shall be securely wrapped and anchored once about the post from outside and secured against slipping by tying the ends with snug, tight twists; provided, however, that on spans of less than one hundred (100) feet both ends of the span need not be wrapped around the posts. The bottom wire of the woven wire fencing shall clear the ground by not more than four (4) inches or less than one (1) inch at any place. 161-3.6 SPLICING WIRE. Splices in barbed and woven wire will be permitted if made with an approved galvanized bolt clamp splice, or a wire splice made as follows: The ends of each wire shall be carried three (3) inches past the splice tool and wrapped around the other wire for at least six (6) turns in opposite directions similar to the standard Western Union splice for iron wire. After the tool is removed, the space occupied by it shall be closed by pulling the ends together. The unused ends of the wire shall be cut close so as to make a neat, workmanlike job. 161-3.7 INSTALLING GATES. The gates shall be hung on gate fittings as shown on the plans. They shall be attached in such a manner that the gate cannot be lifted off the hinges. Gates shall be so erected as to swing in the direction indicated and shall be provided with gate stops as specified, or as shown on the plans. Gates shall be erected at suitable places, as directed by the engineer, or as shown on the plans. 161-3.8 EXISTING FENCE CONNECTIONS. Wherever the new fence joins an existing fence, either at a corner or the intersection of straight fence lines, a corner or anchor post shall be set at the junction and braced and anchored the same as herein described for corner posts and shown on the plans. If the connection is made at other than the corner of the new fence the last span of the old fence shall contain a brace span. 161-3.9 CLEANING UP. The contractor shall remove from the vicinity of the completed work all tools, buildings, equipment, etc., belonging to him or used under his direction during construction. METHOD OF MEASUREMENT 161-4.1 Fences, Class "C" (Steel Posts), and Class "D" (Steel Posts), shall be measured in place from outside to outside of end posts or corner posts and shall be the length of fence actually constructed, except the space occupied by the gates. Driveway gates and walkway gates shall be measured in units for each gate installed and accepted. BASIS OF PAYMENT 161-5.1 Fences, Class "C" (Steel Posts) and Class "D" (Steel Posts), shall be paid for at the contract unit price per linear foot complete in place, which price and payment shall constitute full compensation for clearing the fence line; for furnishing, handling, erecting, and placing all materials; and for furnishing all labor, equipment, tools, and incidentals necessary to complete the work. Gates shall be paid for at the contract unit price each per driveway gate and per walkway gate complete in place, which price and payment shall constitute full compensation for furnishing, handling, erecting all materials complete with fittings; and for furnishing all labor, equipment, tools, and incidentals necessary to complete the work. Payment will be made under: Item P-161-5.1 Fence, Class "C"-per linear foot. Item P-161-5.1 Driveway Gates-per each. 162-1.1 ITEM P-162 CHAIN-LINK FENCES (Class "E") DESCRIPTION This item covers the requirements for furnishing materials and constructing new chain-link fences and gates in accordance with the details included herein and as shown on the plans. The class of fence to be erected shall be Class "E" chain-link fencing, as indicated on the plans and in the bid proposal. The fence shall be the product of a manufacturer who has demonstrated by actual installations of a similar nature that its product is of the type required. The contractor shall include all supplementary parts necessary or required for a complete and satisfactory installation within the true meaning and intent of the drawings. All runs of the fence shall present the same general appearance and the product of one manufacturer only will be accepted, except for items which do not influence the appearance of the completed fence. No used, rerolled, or open-seam steel will be permitted in posts, gate frames. rails, or braces. MATERIALS 162-2.1 FABRIC. (a) The chain-link fabric shall be No. 6 ASW gauge copper-steel wire woven in a two (2) inch mesh and shall be four (4) feet high. The fabric shall meet the requirements of A. S. T. M. Designation A-117. The fabric shall be heavily zinccoated by the hot-dip process after weaving. The fabric shall have a knuckled selvage along the top rail. The fabric at the bottom of the fence shall have a twisted and barbed selvage; the barbing shall be done by cutting the wire on a bias, thus creating sharp points. (b) Tensile Strength Test. Wire pickets of which this fabric is made shall stand a tensile strength test of 70,000 pounds per square inch, based on the cross-sectitonal area of the galvanized wire. (c) Galvanizing Test. Chain-link fabric shall withstand twelve (12) one-minute immersions under the standard Preece Test. The test is to be made on a section of wire picket at least four (4) inches in length so as to include at least one bend and one straight side of the formed link. 82 |