Kamloops Forest District FIVE STRAND SMOOTH WIRE FENCE SPECIFICATIONS 2000/05/17

Transcription

1 Kamloops Forest District FIVE STRAND SMOOTH WIRE FENCE SPECIFICATIONS 2000/05/17 CONSTRUCTION IS TO BE IN ACCORDANCE WITH THE FOLLOWING AND ATTACHED SPECIFICATIONS AND SKETCHES: Page UPART 1: MATERIALS SPECIFICATIONS U 1.1 Wooden Materials Metal Materials Visibility Strips Wire Tension Measurement.3 UPART 2: FENCE CONSTRUCTION SPECIFICATIONS U 2.1 Braces End Braces Corner & Change of Direction Braces Line Posts Line Posts When Crossing Depressions (Using Dip Anchors) Barbed Wire Droppers Slip Wire Gates Cattle Guards 13 UPART 3: GENERAL SPECIFICATIONS U 3.1 Stream Crossings Fence Right of Way Clearing Ground Disturbance Seeding Use of Trees Removal of Garbage Fires 14 Potential Tender Clauses. 15 Potential Payment Schedule Clauses.. 15 U:\WWWroot\DKA\items working on\range fencing specs\efs_smooth_fence specs 2004 April.doc 1

2 P [0.40 UPART 1: MATERIALS SPECIFICATIONS U Materials and or fence components may be sampled and items failing to meet specifications will be required to be removed and replaced. U1.1 Wooden Materials UAll wooden materialsu are to be pressure treated to CSA standard # for posts. 3 (an average net retention of 6.4 kg/mp pcf] by assay of chromated copper arsenate) Presently three suppliers meet our requirements for treatment of wood fence materials. They are Paxton Forest Products Inc., Kamwood Products Ltd. and Princeton Wood Preservers Ltd. Materials from other plants that treat wood fence products with preservatives must meet the above requirements for treatment and be pre-approved by the Contract Officer. This includes gate stakes, posts, all rails, 'A' frame members, droppers and twist sticks. Any cut ends or edges will be brush treated with preservative on site. Heartwood posts and rails are UnotU acceptable. ULine & Brace Posts Type -Pine posts -treated -pointed & domed Size -line posts 4-5 inch x 6 feet long - A frame members and gate stakes 3-4 inch x 7 feet long -brace posts 5-6 inch x 8 feet long UBrace Rails Type -Pine rails -treated -square ended Size -4-5 inch x 10 feet long UTwitch Sticks Type -wooden, treated, paint cut ends with preservative Size -3 inch diameter -length to suit brace UDroppers - Wooden Type -wooden; fir, pine, spruce, hemlock. -square or rectangular droppers only - no round droppers. -without weakening knots or other flaws. -cedar may be used, but see note on attachment about stapling. Size -minimum 1 ½ inch x 1 ½ inch, (maximum of 2 x 3 inch) x 42 inch long. Treatment -all droppers to be treated as above - (cedar exempted). Attachment: 1.- stapled with 1 1/2 inch galvanized barbed staples on all wires, with top and bottom wires wired with soft galvanized 17 gauge wire as per Section 2.7. or 2. staples with 2 15 gauge air staples on each wire with wiring on top and bottom wire with 17 gauge soft galvanized wire as per diagram in Section all smooth wires tied with soft galvanized 17 gauge wire as per Section 2.7 U:\WWWroot\DKA\items working on\range fencing specs\efs_smooth_fence specs 2004 April.doc 2

3 U1.2 Metal Materials UWire Type - high tensile smooth wire Size - single strand 12 ½ gauge Breaking strength - minimum 1350 lbs Rust protection - class 3 galvanization Dropper wire - soft galvanized 17 gauge (rebar wire not acceptable) UStaples for posts Type -slash point -galvanized -barbed shank Size -2 inches long UDip Anchors Type and size -firm ground 2 inch x 2 inch x 4 feet steel angle iron with sharp point -soft ground 3 inch x 3 inch x 5 feet steel angle iron with sharp point Contract officer may accept suitable substitutes, i.e. use of line posts ends to be painted with preservative. UMetal T PostsU For use on severe steep ground only as per Contract Officer instruction. U1.3 Visibility Strips 6 inch strips of white plastic e.g. Vexar fence. To be attached with aluminum hog rings to the top wire every 2 feet. Locations as required by the contract officer (may vary as instructed by Contract Officer). U1.4 Wire Tension Measurement A wire tension measuring device can be used to confirm fence wire tension, as shown below. UPART 2: FENCE CONSTRUCTION SPECIFICATIONS U:\WWWroot\DKA\items working on\range fencing specs\efs_smooth_fence specs 2004 April.doc 3

4 U2.1 Braces Strong corners and braces are the essential foundation of a barbed wire fence. Corners shall be constructed wherever there is a change in direction. UBetween corners the fence shall be built in a straight lineu All corner and brace posts shall be driven to a minimum 3 ½ foot depth. As long as the ground continues to accept the post relatively easily, the post will be driven until 46 inches remains aboveground. A tie point is needed a maximum of every 440 m (1440 feet) to allow tensioning of the line wires. This then dictates the spacing of braces, whether end braces (see below) or corner braces (see section 2.3, page 6). U2.2 End Braces UDiagram # 1 TWO-POST END BRACE A two-post brace will be constructed at end of fence sections, such as at gates, etc Post 8 foot 5-6 inches dia. Rail 10 foot 4-5 inches dia. Maximum 10 between vertical posts. Minimum for rails 9 8 for adjustment between posts cut end to be painted with preservative. Compression (horizontal) brace rail shall be 10 feet in length on each side of the corner with a minimum diameter of 4", shall be pressure treated, and shall be secured with 10" Ardox nails (or 3/8' rebar) Uthrough drilled holesu in both the two posts and the rail. Rails shall be installed at a height that is between the top two wires (approx 37 from ground). Diagonal brace wire shall be 2 strands of 12 gauge high tensile galvanized wire, and shall be held in place by the head of the Ardox brace nail (top end) and staples (bottom end). The wires will be located 8 inches from the ground at the bottom end. The wire shall be tensioned by twisting with a 'Twist stick' which shall be wired to the horizontal brace. All brace assemblies shall be constructed with posts perpendicular to the ground (i.e. following slope). Do not leave nails/rebar or wire ends projecting in a dangerous manner UDiagram #2 END BRACES AT EDGE OF GULLIES OR CREEKS U:\WWWroot\DKA\items working on\range fencing specs\efs_smooth_fence specs 2004 April.doc 4

5 At edges of large gullies or creeks the fences from both sides will be tied off at end braces, and a separate section built through the gully or across the creek. At very sharp, short, stable gully, the fence may go straight across without end bracing, provided the span does not exceed 40 feet. An under fence then may be built through the gully. See section 2.5, page 9, for anchor installation. U:\WWWroot\DKA\items working on\range fencing specs\efs_smooth_fence specs 2004 April.doc 5

6 U2.3 Corner & Change of Direction Braces Corners will be placed so there is at least 6 feet clear on both sides of the fence to allow sufficient room to drive cattle down either side of the fence. If corner post is in a moisture receiving area, two dip anchors will be used. The 3 or 4 post corner must be used on all corners with a change of direction of 60 degrees to 90 degrees. See next page for braces on change of directions less than 60 degrees. UDiagram #3a 3-POST CORNER BRACEU (for changes75 to 90 degrees) use a 3 post brace on corners between 75 and 90 degrees. a 3 post corner is suitable for tying off or where wires are not tied off on the corner post. UDiagram #3b 4-POST CORNER BRACEU (for changes 60 to 75 degrees) use a 4 post corner on change of direction of 60 to 75 degrees these change of directions are often called dog legs each fence section of a 4-post corner brace acts independently of the other tie slack wire between the two end posts to close this space U:\WWWroot\DKA\items working on\range fencing specs\efs_smooth_fence specs 2004 April.doc 6

7 UDiagram #4 INSIDE BRACESU (for changes up to 60 degrees) A bisecting post corner (Inside brace) may be used where the change of direction is less than 60 degrees. The location of the brace will split the angle evenly. This assembly uses 8 foot 5-6 inch posts and 10 foot 4-5 inch top rail. The bisecting post corners must be protected from cattle rubbing damage to brace by: a) normal spec fencing behind brace, or, b) by 4 inch pressure treated rails drilled, nailed, and wired under the brace rail. Note: a supply of longer rails will be required for this. Wire will not be tied off on a bisecting brace. Use adequate slider staples when wrapping around corners (Diagram # 8, page 11). Wire may be substituted for lower non-supporting rails (top rail remains as part of structure) post 10 top rail post One centrally placed rail between top rail and ground acceptable. HOW TO ESTIMATE A 60 P O PANGLE U:\WWWroot\DKA\items working on\range fencing specs\efs_smooth_fence specs 2004 April.doc 7

8 U2.4 Line Posts Posts will be spaced at all significant dips and rises so as to ensure that the bottom wire between the posts shall remain 16 inches above the ground, plus or minus 2 inches. The maximum distance between line posts is 21 feet. All posts shall be firmly set into the ground to a depth of 26 inches.. Top of posts will be approximately 46 inches above ground. Use adequate guide pins to start post holes; add water if required. Tops of posts shall not be cut off. Mushroomed, shattered, split and broken posts are not acceptable. UDiagram #5 POSTS TO BE PERPENDICULAR TO GROUND Posts will be aligned perpendicular to surface of the ground. UDiagram #6 A FRAME CONSTRUCTIONU "A" Frames shall be constructed of posts where it is impossible to set a post. If a succession of A Frames must be used, they may need to be anchored with steel posts. U:\WWWroot\DKA\items working on\range fencing specs\efs_smooth_fence specs 2004 April.doc 8

9 P in U2.5 Line Posts When Crossing Depressions (Using Dip Anchors) Due to the amount of tension on fence wire, when a post is set on ground lower than its 2 neighbouring posts, an upward force is exerted. When the soil is moist in the spring the post may pull out. On firm soil with a dip elevation of 1 foot (i.e., 1 foot below a line between the tops of the adjoining 2 posts) use a 5-6 inch x 8 foot post set 3 ½ feet deep. If there is any chance that the soil may saturate in the spring, add an anchor. On firm soil with a dip elevation of 1 to 3 feet, use a 5-6 inch x 8 foot post and one anchor. If the soil may saturate, use 2 dip anchors. On dips greater than 3 feet, use a 5-6 inch x 8 foot post and 2 dip anchors. Double staple, or bench staple line wires (see Diagram # 8 on page 11), as necessary to prevent staple failure or wire breakage. The above requirements may be varied by the contract officer, as warranted. UDiagram #7 POST ANCHOUR o Driven at 45P line with fence, and nailed to post with 6 inch galvanized Ardox nail. Use the 2 x 2 inch anchor in normal upland soil. On organic or other soft soil use the 3 x 3 inch anchor. Do not leave sharp ends of anchors exposed as a dangerous projection. Wood line posts are acceptable as anchors with any cut end to be treated with preservative. U2.6 High Tensile Smooth Wire U:\WWWroot\DKA\items working on\range fencing specs\efs_smooth_fence specs 2004 April.doc 9

10 Spacing on posts from ground level are 16 inches, 23 inches, 30 inches, 36 inches and 42 inches, as shown in Diagram #1, page 4. Height of the top wire is not to exceed 42 inches. Between posts, bottom wire must remain 16 inches +/- 2 inches from the ground, adjust post spacing to achieve this. Wire shall be stapled to posts with approved staples. Staples shall be placed diagonally to the posts (Diagram # 8, next page). When tying off, the wire shall be wrapped once around the post and the tail neatly knotted and wound back with an end post knot, or an approved mechanical connector (Diagram #9, below). High Tensile Smooth Wire shall be tensioned to 250 lbs. Permanent in-line tensioners will be used on each wire and should be placed in the middle of the strain for maximum benefit. Wire shall be tensioned every 440 metres (1440 feet) which will the spacing of tie off braces. See section 1.4, page 3 for a simple device for measuring tension. UDiagram #9 JOINING AND TYING OFF FENCE WIRE Commonly used knots for high tensile smooth wire are shown below. Knots are effective to +/- 80% of wire strength. The mechanical splices provide 100% wire strength. U:\WWWroot\DKA\items working on\range fencing specs\efs_smooth_fence specs 2004 April.doc 10

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12 U2.7 DroppersU 2 droppers per 21 foot panel will be attached by a method approved by the Contract Officer. Maximum space between droppers is 8 feet. Droppers are not to touch the ground. Droppers should not move after attached to wire. Each wire must be attached to droppers with two (2) 15 gauge staples. The top and bottom wire must be wired with soft galvanized 17 gauge wire to the dropper as per figure 8 above. (rebar wire not acceptable) U:\WWWroot\DKA\items working on\range fencing specs\efs_smooth_fence specs 2004 April.doc 12

13 U2.8 Slip Wire GatesU Gate compression brace shall be same specifications as an end brace (Diagram #1, page 4). Barbed wire slip wire gate construction shall be as illustrated below. TY-TEN gate closures will be used on all gates. The standard width will be 16 feet, with 5 droppers wired in and stapled, with 3 inch treated stakes at each end of gate, unless otherwise directed by the Contract Officer. On main cattle drive routes, gates will be 20 feet wide. 2.9 Cattle Guards Cattle guards will be installed 5 inches above the level of the road, and the back-fill firmly tamped with the machine bucket, but left 2 inches above the level of the guard. The guard will have a 3 foot pit under it, measured from the top of the grid. Each side of the guard will be finished with a 5-6 inch x 8 foot posts at each comer, and with three, 4 inch rails between. Do not narrow the running surface of the guard, but do not leave an apparent pathway along the guard. A gate shall be beside each guard, (unless terrain dictates that it be away from the gate), and may be attached to one of the cattle guard posts. U:\WWWroot\DKA\items working on\range fencing specs\efs_smooth_fence specs 2004 April.doc 13

14 PART 3: GENERAL SPECIFICATIONS 3.1 Stream Crossings Operations will be conducted in such a manner that they protect stream banks and minimize damage to understory vegetation. 3.2 Fence Right of Way Clearing Removal of live, healthy, merchantable trees will be minimized. The right of way may be 'thinned' to allow machine access and fence alignment. Brush, small trees and deadfall will be removed for 10 feet on either side of wire. Dead, defective or leaning trees likely to fall across the fence shall be felled after consultation with the Forest Officer. All branches shall be lopped from the tops of all felled trees, and the remainder of the tree bucked into lengths so each section of the tree makes contact with the ground. In areas where Spruce or Douglas fir bark beetle infestations are endemic and it is necessary to cut live Douglas fir or spruce trees over 20 cm in diameter that cannot be removed; the trees shall be bucked to 30 cm blocks which must be scattered on the ground in order that habitat for bark beetles is destroyed. All disposal shall be to the satisfaction of the Forest Officer. In areas of epidemic bark beetle infestations the Forest Officer may prescribe additional treatments. Trees, mud, or any substances likely to cause pollution shall not be deposited in any stream channel nor shall any damage be done within the high water level of any stream channel. Corduroy will be used in wet areas or where approved for small stream crossings. Sale or disposal of merchantable trees from the R.O.W. will be as agreed to with the contract officer. 3.3 Ground Disturbance Ground disturbance shall be minimized. No dirt is to be moved without contract officer approval. 3.4 Seeding Any soil that is disturbed will be seeded with a seed mix approved by the contract officer. 3.5 Use of Trees In general, wire is not to be fastened to trees. However, the contract officer may authorize the use of a few trees as posts or corner braces in unusual circumstances, as in crossing rocky knolls, swampy areas, or as tie offs when posts cannot be driven securely Nailers shall be used to fasten wire to trees to prevent wire from becoming ingrown into trees. A nailer shall be a post or a 2"x 4" fastened to a tree with 10" common nails through drilled holes. Some heavy bark may be removed prior to setting nailer boards. Nailers should be also used if wire is to be wrapped around a tree to prevent choking or eventually killing the tree. Use five or more nailers spaced around the tree. Leave 2 to 3" of nail for tree growth. 3.6 Removal of Garbage Any garbage, including pieces of wire, staples, treated or sawed wood, bundle straps, boxes, etc. will be removed from site and properly disposed of. 3.7 Fires It is the contractor s responsibility to be adequately equipped to extinguish any fires that may be started by the fence crew or machinery. The degree of equipment necessary will depend on hazard ratings.. U:\WWWroot\DKA\items working on\range fencing specs\efs_smooth_fence specs 2004 April.doc 14

15 Potential Tender Clauses A description of the machinery, with pictures, and a profile of the crew experience, that would be used on this project, must accompany the tender. Post driving systems will be able to set 5-6 inch by 8 feet posts to depth of 3 ½ feet in glacial till. Preference may be given to contractors with vibrating post drivers mounted on a skidder or heavy 4 wheel drive tractor, or tracked machine where ground damage is not a problem. Tracked machines will not be used in grasslands. The lowest bidder may not necessarily be granted the contract. Suitability for this particular project will be considered. The successful bidder and the contract officer will go over the project in detail before construction commences. Potential Payment Schedule Clauses When the R.O.W. is complete, an invoice may be submitted for an amount up to $ At completion of cattleguard installation, an invoice may be submitted for an amount up to $. When one-half of the fence is complete, an invoice may be submitted for an amount up to $, at a fence rate of $ per meter. When the total project is complete, a final invoice of a sum not to exceed the total contract price of $ when combined with all previous invoices, may be submitted. The payment for fencing will be at the rate of $ per meter Total payments on total project will not exceed $. JRW Kfdfen~1 Dkara/md/improve/Barbedspecs.doc U:\WWWroot\DKA\items working on\range fencing specs\efs_smooth_fence specs 2004 April.doc 15