22 June 2015
Scope of work
Project Number
Project Name
Project Scope
Compiled by
PRJ09217
Hogsback RS Tower replacement
Civils for Tower replacement
RG Elliott
Rev
0
1 INTRODUCTION
2
2 SCOPE OF WORK
2
2.1
Safety
2
2.2
New 15 meter tower
2
2.3
Earthing
3
2.4
Underground conduit for cellular provider feeders
4
3 CLEANING OF SITE
5
4 CAMPING ON SITE
5
5 LIST OF DRAWINGS
5
6 STANDARDS/PROCEDURES REFERENCE LIST
5
7 SITE INFORMATION
5
8 CONTACT INFORMATION
5
PRJ09217 –Hogsback RS tower replacement - Rev 0
Page 1 of 6
22 June 2015
1 Introduction
As part of an initiative undertaken in the Coastal region, TUV Rheinland were
contracted to perform a structural analysis of the various telecommunication
towers in the region. The analysis of the Hogsback RS tower identified, amongst
other structural issues that 60% of the tower legs need to be replaced.
Considering the extent of the upgrades needed to ensure the structural integrity
of the tower, it was recommended that the tower be replaced.
2 Scope of work
The project makes provision for the erection of a new 15m angle iron 4 legged
lattice mast, relocation of the existing antennas (with associated services) onto
the new tower and provision of underground conduit piping for cellular provider
feeder cables .
This document covers the civils work required for erection of the new tower and
underground feeder conduit.
2.1
Safety
While performing any work for Eskom, the contractor shall comply with all
relevant Statutory & Eskom safety procedures, including but not limited to
induction training, Cardinal Rules awareness, safe personnel transport, etc. (See
Standards/procedure section for list of safety documents)
The contractor to provide the Project Manager with the safety file before any
work commences on site
2.2
New 15 meter tower
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Mark out and excavate the radio tower foundation as per the site Layout
drawing “Hogsback site layout.pdf” and supplier tower foundation design,
noting that the tower plinth is limited to a 4 x4 meter footprint.
An Eskom Telecommunications representative must inspect and approve
the excavation for the foundation prior to concrete casting.
Build the tower foundation, the construction to comply with both the Eskom
and supplier tower foundation specification.
Foundation plinths to be floated to a smooth finish.
Completed concrete plinth should be left to cure for the specified number of
days as per supplier’s specification. Construction of tower can only begin
once it is positively determined that the concrete has fully cured.
The 15 meter tower to be erected on the tower foundation, the tower to be
constructed in accordance with the “Eskom general tower specification –
240-599676638(0) and the Supplier design as per tender submission.
Tower to be painted as per specification
All tower bolts to have two (2) nuts fitted.
PRJ09217 –Hogsback RS tower replacement - Rev 0
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22 June 2015
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All nuts and bolts to be tightened to suppliers specifications. Tower bolts to
be sealed just above the exit from concrete with Power Mastic to prevent
corrosion due to water retention where bolts exit the concrete.
The contractor must recheck all nuts and bolts after the tower is complete.
After final tightening of the all nuts and bolts, all nuts and bolt threads must
be wire brushed and coated with cold galvanising paint.
Mount aircraft warning light (DC) and run the power cable to the container
feeder entry, securely rolling up and leaving sufficient slack for Eskom to
connect to the container DC supply
The Contractor will manufacture and install a cable tray, with feeder cover
protection, from the tower to the container feeder entry gland plate, as per
site layout drawing.
Contractor to install three vertical feeder ladders as specified in tower
design and shown on site layout drawing.
A climbing ladder must be provided, the ladder to start at ground level,
either fixed to the tower foundation or on an appropriate separate concrete
foundation. The climbing ladder must be vertical and must be fitted with a
continuous safety cage, with the exception of the bottom two metres.
Hoops on the safety cage to the ladder shall be not more than 900mm
apart
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2.3
Earthing
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Contractor to provide earth mat as per attached Eskom drawing “Hogsback
site layout.pdf”
The Earth mat installation shall be completed in accordance with the
Eskom specification “ Radio Station Earthing and Bonding – 24056872313” and shall ensure:
150mm² cross-section flat copper is used for the Tower earth ring and
radial earth connections to the fence posts.
The two gateposts of the station fence are bonded together using a
copper strap of 150mm² cross-section.
The earth rings are laid not more 100mm from the tower and container
foundations.
The tower and container earth ring are connected together.
All four tower legs are bonded to the tower earth ring and the cat ladder
bonding plate at the bottom of the tower is bonded to the nearest tower
leg earth point
 The cat ladder bonding plates must be clamped to the flat bar of the
cat ladder
 The cat ladder-bonding plates must be clamped onto the same side of
the cat ladder as the feeder
 Ensure that the cat ladder flat bar from top to bottom is continuous
with no breaks or loose connecting nuts and bolts.
Earthing system to be attached along the length of the main leg of the
tower. The earth strap is to be connected to the lightening rod at the top of
the tower and bonded at the bottom to the tower leg earth. A cat ladder
bonding plate is to be fitted 500 mm below the top of the tower, 300mm
below each landing and at the bottom of the tower. The bonding plates
shall be connected to the tower leg earth strip.
PRJ09217 –Hogsback RS tower replacement - Rev 0
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22 June 2015
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The existing earth wire connecting the container to the earth mat must be
replaced with a proper earth connection as per the Eskom spec and all
radials properly bonded to the earth bar.
- All earthing / bonding strips crossing each other or in close proximity are
bonded together.
 The earth mat and all joints must be inspected by Eskom
Telecommunications representative before being covered.
 To verify that the Earth mat has been correctly installed and bonded, the
contractor shall perform the following and provide a certificate with the
relevant readings:
a) Conduct an earth resistivity test from the tower earth strap.
b) Conduct an earth continuity test from the tower earth strap to the
container/building earth ring and relevant fence posts to which they
connected an earth strap.
2.4
Underground conduit for cellular provider feeders
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The contractor to supply and install 6 x 110mm class 12 PVC pipes as per
site layout drawing.
A trench measuring some 750mm wide by 450 mm deep would need to
be excavated to house the PVC pipes. EXTREME CARE NEEDS TO BE
TAKEN WHEN EXCAVATING THE PORTION OF TRENCH NEXT TO
THE CELLULAR PROVDER FENCE AS A 3.3KV POWER CABLE IS
RUN UNDEFRGROUND (APRROXIAMETLY 500MM DEEP) ON THE
ESKOM SITE, ALONG THE LENGH OF THE FENCE, TO POWER THE
CELL C AND SAP SITES.
Slow bends need to be fitted at both ends of the pipes. On the Ceullular
end, the slow bend needs to surface some 300mm inside the Cellular
provider site and arrangements would need to made with the Cellular
provider for site access to excavate the trench. On the Eskom tower end
, the slow bend needs to be fed through the tower foundation and brought
to the tower foundation surface in line with the vertical feeder ladders
provided for the ceullar provider (see site layout drawing).
Slow bends need to be supplied with “sealing” lids for both ends.
A concrete slab, with relevant steel mesh reinforcement, measuring an
approximate 6m x 1m is to be cast in the entrance of the site (over the
buried conduit area), to ensure the pipes are not damaged by vehicles
accessing the site. The concrete slab is to be cast to the appropriate
thickness to support light vehicular traffic (minimum 120mm).
To cater for the above class of traffic , the concrete must be 25Mpa grade,
unless otherwise recommended by a Certified Civil engineer.
All concrete surfaces shall be floated by means of wooden/ plastic hand
float tool to ensure that the surface is even and smooth; free of hollow/
high spots.
The outer perimeter edges concrete of the shuttered panel shall be
worked by means of a nosing to form a bull nosed edge.
PRJ09217 –Hogsback RS tower replacement - Rev 0
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22 June 2015
3
Cleaning of Site
The Contractor to remove all rubble and excess building material to the satisfaction
of the owner and Eskom
4
Camping on site
Where the contractor requires to set up camp on site, the contractor is required to
make all arrangements with ESKOM and comply with their rules and regulations
5
List of drawings
Site
Hogsback RS
6
Drawings
Hogsback site layout.pdf
Hogsback Tower rev1
Supplier drawings
Standards/procedures reference list
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240-599676638(0)-General Tower Specification
240-56872313 Radio Station Earthing and Bonding
ETSP 0459 ET Tower Lights specification
32-418 Work at height procedure
ETPR 0745 Safe Hauling Procedure
QM-58 Supplier contract quality requirements
Safety
- 240-70044602 – Hazard risk
- 240-73198174 – SHE Spec
- QM-58 Supplier contract quality requirments
7 Site information
Site name
Hogsback RS
GPS Co-ordinates
32° 34’ 52.2” S
26° 56’ 12.5” E
8 Contact information
Role
Project Engineer
Project Manager
Project Co-ordinator
Project Supervisor
Name
Ray Elliott
Nevin Nel
Simon Panya
Sam Ncapayi
Contact number
0836331675
082 787 5895
072 692 2331
083 260 2914
PRJ09217 –Hogsback RS tower replacement - Rev 0
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22 June 2015
Ops and field
services
SHEQ co-ordinator
MTN
Vodacom
Unathi Dyantyi
8714 2840
Andre Crous
0448012615
Gerhardus Swart
0832121938
(gerhardus.swart@mtn.co.za)
Wynand Skorbinski
0829904704
(Wynand.Skorbinski@vodacom.co.za)
PRJ09217 –Hogsback RS tower replacement - Rev 0
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