Concrete Palisade Fencing
APPLICATION: INDUSTRIAL TYPE PRECAST CONCRETE PALISADE SECURITY FENCE
1. PRE-FABRICATED CONCRETE ELEMENTS.
1.1. WORKMANSHIP AND FINISH IN GENERAL:
All concrete elements are manufactured from sound concrete and free of structural defects.
All concrete elements have an off-shutter finish on three sides, with the fourth side having a wood floated finish.
A minimum cover of 12mm as per SABS 1372-1983 is maintained in all concrete elements.
1.2. SHAPE & DIMENSION:
All elements shall retain the required shape and be true to the respective and specified dimensions as indicated in 2.1, 3.1 and 4.1.
1.3. PERFORMANCE REQUIREMENTS (STRENGTH):
The required concrete compressive strength in all pre-fabricated elements shall be a minimum of 28 MPa at 28 days, determined in accordance with SANS 5836.
All concrete elements shall be cured in accordance with the recommendations given in SANS 5836.
All steel used for reinforcements in pre-fabricated elements shall be high yield steel with a minimum characteristic strength of 410 MPa, and shall be free of rust, loose scale, flux, grease or oil substances and shall in general comply with SABS 920 and SABS 4482.
All reinforcing steel wires shall be free of rust, loose scale, flux, grease or oil substances.
2.1. The post are 3.0m long and slotted, as per drawing, to take the horizontal load bearing rails.
The front edges of the post are curved.
The back section is 140mm wide tapering to the front to 80mm.
The thickness of the post shall be 225mm.
Posts shall be spaced at 2.0m centre in a concrete foundation.
The top of the post is angled at 45°.
2.2. Each post contains four 4mm x 2900mm high carbon steel bars with high yield strength.
3.1. The pales are 2.4m long with two 10mm holes to take 8mm carriage type bolts.
The front edges of the pales are curved.
The back section is 100mm wide tapering to the front to 80mm.
The thickness of the pales shall be 80mm.
Pales are spaced at +/- 200mm centres and a total of 9 pales are installed per 2 meter section.
3.2. Each pale contains two 4mm x 2350mm high carbon steel bars with high yield strength.
The top and bottom of the pales are angled at 45°.
4.1. The rails are 1.98m long with nine x 10mm holes to take carriage 8mm type bolts.
The rails shall be 150mm wide and 80mm deep.
The rails slide into the posts and are grouted into posts with 2 to 1 sand/cement mix.
4.2. Each rail contains four 4mm x 2350mm high carbon steel bars with high yield strength.
5.1. All bolts holes are filled with cement mortar. The grout comprises a 2 to 1 sand/cement mix.
5.2. All nuts, bolts and washers used for the erection of the fence are mild steel. Electro-galvanised (zinc and chrome) fastners can be supplied as alternative at additional cost.
6.1. Each post are embedded to full depth in concrete in a foundation hole of at least 600mm x 600mm and a depth of 600mm.
6.2. The sizes specified in par. 6.1 are for firm soils and it may be necessary to increase these sizes for softer yielding soils.
6.3. Foundation shall be a minimum of 15Mpa at 28 days.
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