6-29 W o v e n W i r e 710.02 C h a i n L i nk Fabric 710.03 C e d a r R a i l F e n c e 710.05 F e n c e P o s t s a nd Braces 710.06 Bars for barways shall be of eastern hemlock, northern white p ine, Norway pine, spruce, cedar, or tamarack, equal in quality to the wood posts. The bark shall be removed and all knots hewn flush. Metal gates shall be of galvanized steel. Staples shall be of galvanized or aluminum coated steel. Concrete for anchoring metal posts, metal braces and wooden ga te posts shall meet the requirements of Section 502 - Structural Concrete, except a ir entraining will not be required. The class of concrete shall be optional. Drive anchors shall be an approved anchorage consisting of two steel angles driven diagonally into the ground through metal clamps bolted to the p ost. All parts shall be galvanized.
607.03 General The Contractor s hall perform clearing and grubb ing necessary to
construct the fence to the required grade and alignment. Posts shall be spaced as called for on the plans except that a variation of 2 feet back or ahead on line may be allowed at approved locations. The top s of posts shall be set to the required grade and alignment. Cutting off the posts may be all owed with approval. Posts for cedar rail fence shall be set plumb in drilled or ha nd dug holes. After posts are placed, rails installed and the posts aligned, the post hol es shall be backfilled. The completed fence shall have the tops of the posts at uniform hei ght above ground following the gradient of the ground. Posts for woven wire fence and barbed wire fence shall be brac ed with Type I or Type II bracing at designated location as hereafter specified. Type I bracing shall include diagonal brace and one post of the designated size. Type II br acing shall include two diagonal braces and one post of the designated size. When the plans require posts or braces to be anchored into the soil, concrete anchors or metal drive anchors shall be used. If concrete is used, tem porary guys to hold the posts in position shall be installed until the concrete has set. Unless otherwise permitted, no material shall be installed on posts or strain placed on guys and bracin g set in concrete until 48 hours after the concrete has been placed. If metal drive anchors are used they shall be installed accord ing to the manufacturer's instructions so all parts will be below the ground surface. On e drive anchor shall be used on 6-30 line posts; two drive anchors shall be used on bracing assembli es. Where two drive anchors are used, they shall be placed perpendicular to each other. Backfill with earth placed in 8 inch layers, loose measure, an d each layer thoroughly tamped. Metal posts to be set in solid rock shall be placed in drilled holes and grouted with a cement grout composed of 1 part Portland cement and two parts s and mixed with water. All surplus material and other debris shall be removed and dis posed of.
607.04 Woven Wire or Barbed Wire Fencing Wood posts shall be set plumb in
holes dug to full depth. Metal posts shall be set plumb by an approved post driver. Posts, which are bent or otherwise damaged, shall be removed and repla ced.
a.Bracing At changes in horizontal alignment in excess of 30º , bracing will be required. At changes in horizontal ali gnment of 15º to 30º, bracing may b e called for on the plans or required by the Resident. At changes in horizontal alignment a ngles of less than 15º, bracing will not be required except at intervals of 660 feet. In depressions where tension in the fencing may cause lifting, the post will require bracing. End, corner, gate, barway, and intermediate posts shall be brac ed and anchored as shown in the Standard Details. If metal posts are to be placed in concrete, the concrete shall be allowed to set before the space around the base is backfilled. Backfill with satisfactor y material thoroughly tamped. If directed, the Contractor shall place a minimum of 6 inches o f gravel in the bottom of the post hole.
b.Gates All gates and the bracing assemblies at gates shall b e constructed of metal.
c.Barways Barways shall be constructed of posts corresponding to the type of fence posts used. Wood crossbars shall be furnished.
d.Erection of Fabric or Wire Fabric or wire shall be stretche d taut. Each strand of barbed wire shall be attached to wood posts with staples. Top and bottom strands of woven wire shall be attached to each post and alternate interior stra nds of woven wire fencing shall be attached to alternate posts. Staples shall not be driven in to line posts to restrict the horizontal movement of wire except at corner posts, end posts a nd bracing where staples shall be fully driven. When attaching fencing to metal posts, approved stay fasteners shall be used. Except as otherwise provided, splicing wire will be permitted at posts only with each horizontal strand of wire wra pped completely around the post. The wire strand shall be 6-31 fastened by winding the wire about the same strand where it lea ds to the post. This type of fastening shall be used at each end post, corner post, and gate post and at barway posts. Other devices designed specifically to splice fencing wire may be used, subject to approval.
607.05 Chain Link Fence Foundations for posts for chain link fence shall be cast-in-
place Portland cement concrete placed in approved forms or shal l be approved metal drive anchors. If wood forms are used, they shall be removed before backfilling. If fiber forms are used, they need not be removed.
a.Braces Fences less than 6 feet in height that are installed with a top rail shall not require any brace rails. Fences less than 6 feet in height ins talled without a top rail and all fences with heights of 6 feet or more shall have brace rails in stalled midway between the top and bottom of the fabric as shown on the plans. Braces shall b e securely fastened to the posts then trussed from the line post to the base of the end, i ntermediate or corner post with a ⅜ inch diameter truss rod and tightened. At changes in horiz ontal alignment of less than 15º, bracing will not be required e xcept at intervals of 330 fe et. At changes in alignment of 15º to 30º, bracing may be require d as called for on the plans or requested. At changes in alignment in excess of 30º, bracing will be required. One brac e assembly shall be furnished with each end or gate post and two assemblies with each corner or intermediate post and at grade changes specified above.
b.Gates Where gates are required for chain link fence, they s hall be constructed of metal.
c.Erection of Chain Link Fabric The grade of fence shall be a pproximately parallel with the grade of the ground. When dir ected, abrupt depressions sha ll be filled. Top rails when required, shall pass through post caps and be se curely fastened to end, corner, brace and gate posts. Joints in top rails shall be mad e with expansion sleeve couplings. On curves with a radius of less than 500 feet, the top rail shall be bent to the arc. The fabric shall be pulled taut, the ends attached to the posts with stretcher bars, and bands or other approved devices. When required, wire fabric sh all be joined by weaving a single strand of mesh wire into the ends of the rolls to form a continuous mesh.
d.Tension Wire When called for on the plans, a tension wire o f seven gage galvanized wire shall be used in place of the top rail.
607.06 Method of Measurement Fence will be measured by the li near foot accepted
in place. Measurement will be along the gradient of the fence from outside to outside of end posts for each continuous run of fence and shall include fence at bracing assemblies but shall not include space at gates and barways. Gates, barways, and bracing assemblies will be measured by the unit of the size and type specified. Excava tion in rock for placement of fence posts in drilled holes will be measured by the cubic yard determined from the actual depth of the drilled hole in the rock and a hypothetical circle diameter of 2 feet. 6-32
607.07 Basis of Payment The accep ted quantities of fence will be paid for at the
contract unit price per linear foot of the type and size specif ied complete in place. Barways, gates, and bracing assemblies will be paid for at the contract unit price for each type specified complete in place. Payment shall be full compensatio n for furnishing and assembling all materials, for excavating and backfilling holes, and for all incidentals necessary to complete the work except that in rock, payment for drilled holes will be made under 109.7.5 – Force Account. Excavation of earth to exposed rock shall be incidental to the several items for erection of the fence. Payment for bracing assemblies shall include furnishing and i nstalling the various larger size and longer length posts, diagonal bracing, ties, an chors and all incidental hardware necessary to complete the type of assembly required, a ll as shown in the Standard Details. At gateways, payment will be made for bracing assembl ies and there will be no separate payment for the gate posts. All extra costs incurred for furnishing and installing the oversize posts at gateways shall be considered included with th e various contract items. Clearing or removal of trees, stumps or boulders, required to install the fence shall be included in the work of the res pective pay items of this sec tion. Payment will be made under: P a y I t e m P a y U n i t
607.08 Woven Wire Fence – Wood Posts Linear Foo t
607.09 Woven Wire Fence – Metal Posts Linear Foot
607.10 Barbed Wire Fence – Wood Posts Linear F oot
607.11 Barbed Wire Fence – Metal Posts Linear Foot
607.12 Barway - Wood Posts Each
607.13 Barway - Wood Posts Each
607.14 Walk Gateway 4 foot – Metal Each
607.15 Drive Gateway 16 foot – Metal Each
607.16 Chain Link Fence – 4 foot L i n e a r F o o t
607.163 Chain Link Fence – 4 foot – PVC Coated L i n e a r F o o t 607.165 Chain Link Fence – 4 foot – without Top Rail L i n e a r F o o t
607.17 Chain Link Fence – 6 foot L i n e a r F o o t
607.173 Chain Link Fence – 6 foot – PVC Coated L i n e a r F o o t 607.175 Chain Link Fence – 6 foot – without Top Rail L i n e a r F o o t
607.22 Cedar Rail Fence Linear Foot
607.23 Chain Link Fence Gate Each 607.24 Remove and Reset Fence Linear Foot
607.25 Remove and Reset Chain Link Fence Linear Foot
607.30 Bracing Assembly Type I – Wood Posts Each
607.31 Bracing Assembly Type II – Wood Posts Each
607.32 Bracing Assembly Type I – Metal Posts Each
607.33 Bracing Assembly Type II – Metal Posts Each
607.34 Bracing Assembly Chain Link Fence Each
Source: Maine Standard Specifications for Road and Bridge Construction, 2020 Edition. Pages 499–502 of 817.
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