REPLACEMENT FENCE AT CERNIAU, Y BERWYN

Description

Strip and replace moorland block boundary fence on the west side of Cerniau, Y Berwyn. The length and location of fencing to be replaced or installed is generally shown in the map above (from point A to C). Fencing to be replaced is shown in blue. All materials to be supplied by the appointed contractor. The approximate lengths of fenceline from point A to C is ~4110m NB the final section of the fence from B to C may be excluded (~700m). GENERAL FENCING SPECIFICATION – Lake Vyrnwy Purpose To install a fence that is stock proof for new-born native breed lambs, sheep, ponies and cattle. Including, as necessary, the removal of old fencing and line clearance works. All operations to be undertaken in a manner that minimises impact to the site. The site is designated as a Special Area for Conservation (SAC) and any damage and repair is the responsibility of the contractor. Specification Delivery of materials: If the contractor is in any doubt as to whether materials delivered to site meet the specifications laid out in the contract, the contractor is to contact the undersigned before these materials are used. The work consists of the following main elements: 1. To take down existing fencing and remove all materials from site 2. To clear line to allow installation of new fence. All cut material will be chipped or neatly stacked under standing scrub. 3. To install fencing, field gates and water gates to the following specification; Gates and Fencing Materials 1. All steel to be galvanised to British Standard. 2. All timber to be softwood pressure treated to British Standard, any cut surface to be treated with recommended sealant – no post tops to be cut. 3. All round posts to be peeled and pointed. The diameter measurements of round posts are a minimum along the entire length of the post. 4. All timber to be from a sustainable British source. (Ø = diameter) High Tensile Barbed Wire Fencing 1. Overall fence height 1100mm, posts to be placed every 2m with a straining post every 100m. 2. The fence will be made up of one top line of barbed wire, and stock netting placed approx. 25mm above a line of plain wire bottom wire. 3. Strainers, box assembly, max 400m apart, minimum of 1.30m into the ground. Multiple boxes to be used as ground conditions dictate, at the contractor’s discretion. Horizontal bars to be rebated max 10mm, fixed by galvanised 12mm Ø, 300mm steel pins, at a height that brings it between the 2 top wires, pins should be driven into a pre-drilled hole of 10mm to prevent moisture from entering the timber. 3.15mm HT plain wire strained around assembly and joined with crimp sleeves. The 12mm Ø pin on the strutting post should be left with 25mm showing to put the diagonal wire over. 4. Turning posts at every change of direction, less than 30 degrees. Minimum of 1.30m in the ground. Strainer assembly to be used at turns exceeding 30 degrees and as ground conditions dictate, at the contractor's discretion. 5. Intermediate posts max 3m apart. Minimum 0.75m into the ground. 6. Tie downs to be used on all types of post as necessary. An intermediate post should be installed at 45º to the vertical post to a depth of at least 0.9m. Tie down post should be fixed with a 12mm galvanised pin using a pre-drilled 10mm hole, between 100mm and 200mm above ground level. 7. 1 top line of barbed wire, Titan high tensile barbed wire. Top wire to be 1050mm above ground level. 8. Wires – high tensile wire 9inch gauge. Should be joined by tying to the manufacturers approved specification or by using a crimp sleeve designed for the task, 2.5 / 3.15 sleeve or 3-4 sleeve and crimped to the manufacturers specification. We do not consider Gripples to be appropriate. All wire to be galvanised to British Standard. 9. Staples, 40mm x 3.15mm galvanised, barbed, angled across the grain of the timber, driven to a depth that does not crush the galvanising, does allow wire to move as it expands and contracts (or gets pressured by stoc

Key facts

Reference

OCT672129

Procedure

Single stage

Category

SUPPLIES