shall comply with Chapter 4, Concrete works. Fence fabric or wire shall not be attached to the posts
until the concrete has cured a minimum of 72 hours.
End, corner, and gate posts shall be braced to the nearest line post with galvanised diagonal or
horizontal braces used as compression members and galvanised steel truss rods with turnbuckles
or truss tighteners used as tension members. Line posts shall be braced horizontally and trussed in
both directions at intervals not to exceed 250 m.
Excavation or filling required along fence lines shall be in accordance with the applicable
requirements of Sections 2.4 and 2.5 of Chapter 2, Earthworks.
Chain-link fabric shall be fastened on the side of the posts designated by the Engineer.
Fabric shall be stretched and securely fastened to the posts, and between posts the top and bottom
edges of the fabric shall be fastened to the tension wires. Tension wires shall be stretched tight.
Tension wire along the bottom shall be installed on a straight grade between posts by excavating
the high points of ground; and, in no case will filling of depressions be permitted.
Fabric shall be fastened to end, corner, and gate posts with a minimum 10 mm diameter steel
stretcher bar and not less than 3-mm by 18 mm stretcher bar bands spaced at a maximum 300-mm
intervals. Fabrics shall be fastened to line posts, top rails, and tension wires with tie wires or post
clips. Fasteners shall be spaced at maximum intervals of 600 mm.
Surplus excavated material remaining after the fence has been constructed shall be disposed of in
a manner approved by the Engineer.
Existing fences that are to remain in place and that have been damaged by the Contractor's
operations shall be replaced or restored by the Contractor at no additional cost to the Owner.
Unless otherwise directed by the Engineer, posts shall be set in concrete to the dimensions shown
on the Contract plans. All concrete footings shall be crowned so as to shed water. If the Contract
plans indicate posts shall be set in undisturbed earth, the Contractor shall either drive or drill them.
Driving shall be accomplished in such a manner as not to damage the post. Voids around the posts
shall be backfilled with suitable material and thoroughly tamped.
Concrete footings shall be constructed to embed the line posts at grade depressions where the
tension on the fence will tend to pull the post from the ground. Forms shall be used for footings where
the ground cannot be satisfactorily excavated in neat lines. Forms shall remain in place for at least
24 hours after concrete placement. Footings shall be backfilled with moistened material immediately
after each form is removed and materials thoroughly tamped. Concrete shall be covered with at least
100 mm of loose, moist material that is free of clods and gravel immediately after placing concrete.
No other curing is required.
Excess excavated and loose material used for curing shall be spread neatly and uniformly. Excess
concrete and other construction debris shall be removed from the site.
Where solid rock is encountered without an overburden of soil, line posts shall be set at a minimum
depth of 360 mm; and, end, corner, gate, brace, and pull posts at a minimum of 510 mm into the
solid rock. Holes shall have a minimum width of 25 mm greater than the largest dimension of the
post section. Posts shall be cut before installation to lengths that will give the required length of post
above ground, or if the Contractor so elects, an even length of post set at a greater depth into the
solid rock may be used. After the post is set and plumbed, the hole shall be filled with Class G3 grout
per Article 4.3.10.4 of Chapter 4, Concrete Works. Grout shall be thoroughly worked into the hole so
as to leave no voids and crowned to carry water from the post.
Where solid rock is covered by an overburden of soil or loose rock, the posts shall be set to the full
depth shown in the Contract plans unless penetration into solid rock reaches the minimum depths
specified above. In this case, the depth of penetration may be terminated. Concrete footings shall
be constructed from the solid rock to the top of the ground. Grouting will be required on the portion
of the post in solid rock.