Sansa civil works panel: five contractors, five years, nationwide sites

The provided document is largely a bill of quantities for the SANSA Hartebeesthoek antenna foundation, control room, concrete hardstand, and access road works. No separate general description beyond the scope listed in the technical specifications.

Scope of works (based on the bill of quantities for the SANSA Hartebeesthoek site):

• Section A – Preliminary and general items: site establishment, contractor facilities, security, safety, supervision, insurance, transport of workforce, staff medicals, PPE, concrete test cubes, 10% contingency, removal of site establishment on completion.
• Section B – Roadworks: site clearance, earthworks (bulk excavation, treatment of road-bed, subbase, base, asphalt surfacing with prime/tack coats, kerbing and channelling).
• Section C – Foundation and concrete hardstand: 1.2m deep foundations, RC columns, RC roof slab, 200mm thick hardstand (30 MPa/19mm concrete), antenna plinth, saw-cut joints.
• Section D – Masonry: brickwork in class I/II mortar, face brick and plaster/paint walls, reinforcement built into brickwork.
• Section E – Carpentry and joinery: aluminium doors and windows, including frames and fixing plates.
• Section F – Electrical installation: lighting, small power, cable trays, conduits, trunking, conductors, socket outlets, isolators, earthing and lightning protection, DB-A1, HVAC (15000BTU and 9000BTU AC units), extractor fans, fire detection, testing and commissioning with COCs.
• Section F – Finishes: floor tiling, raised floors, skirting, nameplates, sundries.
• Works must comply with SANS standards (e.g., SANS 1200D for earthworks, SANS 1200 GA for concrete and reinforcing steel, SANS 0400 for windows).
• Includes topographical survey and aerial photos combined into geo-referenced orthophoto at no additional cost.

Pricing bill of quantities template provided, rates are per unit (R/unit) with amounts carried to a final summary. Includes a 10% contingency on the works total. No bid security, retention, or payment terms stated in the provided document.

No specific compliance requirements (e.g., CIDB, B-BBEE, CSD) stated in the provided document.

The project involves the design of shelter hardstands for the Aircas 2 and Aircas 3 projects for the South African National Space Agency. The hardstand design is for antenna drive and equipment control shelters at Hartebeeshoek. The engineering calculation report (Ref OCG-Cal-25-03) was prepared by Orvall Corporate Group and issued for use on 20 October 2025.

Geotechnical investigation date: 09 May 2024.

Design of shelter hardstands for Aircas 2 and Aircas 3 projects.

• Location: Farm No. 502 JQ, Hartebeeshoek, Krugersdorp, 1740.
• Structure: 150 mm thick reinforced concrete surface slab, reinforced with Mesh Ref 395.
• Container dimensions: Antenna Drive Shelter 6058 mm x 2350 mm; Antenna Equipment Control Shelter 10000 mm x 3500 mm.
• Design loads: Live load allowance 5 kN/m2; dead load 1.05 kN/m2; container self-weight 37.77 kN.
• Design bearing pressure: 150 kPa.
• Concrete: fcu 30 MPa; rebar fy 450 MPa; rebar 12 mm; cover 50 mm.
• Required steel area: 195 mm2/m; provided 251 mm2/m (OK).
• Shear and bearing capacity checks pass.

The geotechnical report recommends a safe bearing capacity of 150 kPa; the experienced bearing pressure is below the allowable, therefore OK.

The tender seeks a structurally engineered foundation design for a 12m S/X dual-band three-axis antenna at the SANSA Hartebeeshoek site. The scope includes the design of new antenna foundation pads, with reference to a geotechnical investigation compiled by GCS Geotechnical.

The procurement is for the design of a 12m S/X dual-band three-axis antenna foundation at the SANSA site on Farm No. 502 JQ, Hartebeeshoek, Krugersdorp, 1740.

Project reference: Aircas 2 and 3.

The foundation comprises a reinforced concrete base 7m x 7m x 500mm thick, with a plinth reinforced with Y20 bars. Base reinforcement is Y16@200 top and bottom.

The foundation must be designed to support a 12m antenna with a self-weight of 45 tonnes (SW 441.45 kN).

Design assumptions:

• Minimum bearing pressure at founding level: 150 kPa, with adequate compaction.
• Soil modulus of subgrade reaction (K design): 30000 kN/m³.
• Ground improvement class: G5, CBR 20%.
• Foundation natural frequency must not be less than 10 Hz.
• Design wind speed: 36 m/s; wind pressure (qe): 0.72 kPa; antenna dish area: 113.10 m².

Antenna loading (ultimate, factored x1.6) was analysed for wind speeds of 23 m/s, 27 m/s and 56 m/s, with overturning moments up to 2023 kN.m at 56 m/s.

Structural design, including reinforcement and foundation frequency checks, must be certified by a Professional Engineer. The calculation was prepared by I. Gininda (Pr.Eng) and approved 20 October 2025.

Reference geotechnical report: GCS Geotechnical Investigation for the Proposed SANSA Antenna, SANSA, Gauteng, Final Report (09 May 2024), ref 24-0136R02.

Environmental loading on the antenna foundation from wind was considered in the design calculations (basic wind speed 36 m/s). No other environmental impact or sustainability requirements are stated.

Returnable documents:

• None specified beyond the completed tender forms and schedules supplied in the document.

Earthing and lightning protection works at SANSA sites, including:

• Earth ring: 50mm bare copper cable installed 1 metre below ground level, offset by 0.5 metre around the pad perimeter.
• Connect earth ring to foundation rebar at two points using earth clamps (point Aa), and run a separate 22mm conduit from the ring to the antenna cable shaft (point BB).
• Bond 50mm copper to the shelter earthing ring, antenna frame, equipment earth bar, and existing shelter earth bar as marked.
• Install 50mm copper connection from the ring to the foundation ring, secured with lugs and 10mm bolts.

Earthing and lightning protection installation details:

• Install 50mm bare copper earth ring 1 metre below ground level, offset 0.5 metre from the pad perimeter.
• Connect earth ring to concrete pad rebar at two points with earth clamps.
• Use 50mm bare copper bonded to the shelter earthing ring and antenna frame.
• Run 22mm conduit from the ring to the antenna cable shaft for equipment earth.
• Bond new earth bar to existing shelter earth bar and antenna earth bar as indicated.

The document is a bill of quantities for civil works at SANSA's Hartebeesthoek site, covering antenna foundation, control room, concrete hardstand, and access road. The works include roadworks, foundations, masonry, carpentry, electrical installation, and finishes. The document date is 2014-10-10, and it includes annotations by Raoul Hodges regarding electrical and HVAC specifications.

The bill of quantities covers civil works at SANSA's Hartebeesthoek site, including:

• Section A: Preliminary and general items — site establishment, security, safety, insurance, supervision, and removal of site establishment on completion.
• Section B: Roadworks — site clearance, earthworks (excavation, filling, subgrade treatment to 93% Mod AASHTO density), subbase (G5/G6 material, compaction to 95% or 93% density), base course from commercial sources, prime coat (MC-30 cut back bitumen at 0.7 l/m2), tack coat (30% stable grade emulsion), asphalt surfacing (30mm continuously graded medium asphalt, 80/100 penetration), kerbing and channelling (precast kerb, SABS 927-1969), and temporary construction road (4m wide).
• Section C: Foundation and concrete hardstand — concrete (SANS 1200 GA) including 30MPa/19mm concrete, reinforcing steel (mild and high tensile, SANS 1200 GA), formwork, 200mm thick hardstand, 1.2m deep foundations, RC columns, RC roof slab, mesh ref. 193 and 245C, saw cut joints (6x40 DP).
• Section D: Masonry — brickwork (NFP bricks, 14MPa nominal compressive strength, class I or II mortar), 220mm and 110mm walls, reinforcement built in horizontally every 4th or 5th layer.
• Section E: Carpentry and joinery — aluminium doors (single and double, with ventilation louvres), aluminium windows (shutterproof, SANS 0400), ramps.
• Section F: Electrical installation — lighting and small power, cable trays (hot dipped galvanised), conduits (PVC, 25mm), trunking (P8000 galvanised), power skirting (Cabstrut P801 or equivalent), PVC/SWA/PVC cables (2.5mm, 4mm, 35mm 4-core), socket outlets, light switches, isolators, light fittings (Type F 400W metal halide floodlight, Type A2 fluorescent 4x28W T5), earthing and lightning protection, DB-A1, airconditioning (15000BTU and 9000BTU AC units, plus 2 x 120000 BTU package units with ducting per annotations), extractor fans, fire detection, and test/commissioning with COCs.
• Section F: Finishes — floor tiling (300x300 ceramic), skirting, raised floor (500x500x340 panels), nameplates, door stops.
• Site works include topographical survey with aerial photos to produce a geo-referenced ortho photo.

The bill of quantities includes a 10% contingency and both fixed charge items (contractual requirements, facilities for contractor) and value/time related items (security, insurance, supervision, site disestablishment). Concrete test cubes (150x150x150, set of 6) are specified. No explicit bond, guarantee, retention, or payment terms are stated in the document.

Closing time: 17:21 (from drawing register header). Closing date per tender record: 9 December 2026. No other dates stated.

Contact email (drawing office): [email protected]

Contact telephone: +27 (0) 11 2195 (incomplete)

Address (drawing office, from register): 66 Nelson Street, Berario, Randburg, Johannesburg (based on address fragments).

Returnable documents: the tender pack specifies no returnable forms beyond the drawing register; bidders must submit the standard bid documentation including the signed SBD forms required by the procurement authority. Submissions must be delivered before the closing time.

The document contains no evaluation criteria; the only reference to evaluation is a drawing category labelled 'Evaluation' with no scoring details.

The document is a drawing register for civil works at SANSA sites. It lists drawings for:

• Antenna foundations (slab, base, column, roof)
• Bulk earthworks and general layout
• Reinforcement layouts and details
• Sections and details for slabs and foundations
• Control rooms and antenna rooms

Scale indications include 1:500, 1:200, 1:100, 1:50, NTS (not to scale). Drawing sizes vary from A4 to A1. No quantities, locations, or standards are stated in this register.

No specific compliance requirements are stated in the drawing register.

The drawing register includes a drawing category labelled 'Evaluation', but no evaluation criteria are provided.

The document is a structural calc sheet for a 7.3 m dual-band antenna platform at SANSA's Hartebeeshoek site. It includes a design calculation report, geotechnical data, foundation design and structural verification. The document is for information only, prepared by Orvall Corporate Group for SANSA on 20 October 2025.

The document is a structural engineering calculation sheet for the design of a new 7.3 m dual-band antenna platform at SANSA's Hartebeeshoek site (Farm No. 502 JQ, Krugersdorp, 1740).

• Antenna self-weight: 32 tonnes (32000 kg), vertical load 313.92 kN, leg reactions 48.74 kN and 108.22 kN per leg.
• Foundation: 14 m long by 1 m wide strip, 200 mm thick reinforced concrete slab (density allowance 2500 kg/m3), concrete strength 30 MPa, reinforcement yield 450 MPa.
• Design bearing capacity: 150 kPa (assumed), actual bearing pressure remains below this limit.
• Reinforcement: Y16@200 (top and bottom) provides 1005 mm2/m versus required 776 mm2/m.
• Concrete cover: 50 mm.
• Structural checks confirm adequacy for shear, bending and bearing.
• The foundation is sized to support the 7.3 m antenna trailer and associated accessories.