MEGATRO 25m mobile communication Tower
MEGATRO is a full service engineering company with a global reputation for delivering excellence and innovation in telecommunications systems.
Over 10 years of experience and innovation in engineering, designing and building towers has evolved MEGATRO into its current form:
Full Turn-Key provider including site acquisition, engineering services, manufacturing, field services-DAS, tech services, value added reseller and monitoring, maintenance and network ownership
Specialize in developing supplying and building wireless and wired networks and in-building telecommunications systems, as well as energy infrastructure
Single source from Design to System Integration
Top quality, ISO 9001 registered
A complete selection of towers including self-support, lattice steel tower, monopoles and guyed towers, form custom-designed radar towers to broadcast towers and energy infrastructure. MEGATRO carries a variety of related products including fall protection, transmission lines, antennas, obstruction lights, and accessories, and other products if client need, MEGATRO also tailored product as per client condition.
MEGATRO mainly design all kinds of towers and posts for:
a. Telecoms
b. Power transmission
c. TV and Radio Broadcast
d. Roads and City Development
e. Wind tower and energy solution
f. Steel workshop and other steel structures
Our complete selection of towers includes:
a. Self-supporting
b. Monopoles
c. Guyed towers
d. Custom-designed radar towers
e. Broadcast towers
f. Power transmission
MEGATRO also designs and manufactures tower related products including:
a. Fall protection
b. Antenna brackets
c. Other accessories if needed by clients
This photo refers to our MEGATRO 25m mobile communication Tower, which we exported to some Asian and African countries these years. It is standard design with weight not too heavier, some of design data as follow:
25m of 4 Legged Mast, Self support lattice tower
Design criteria
Loading (General)
All design and loading shall be calculated in accordance with one of the following:-
BS:-BS 8100: Part1: 1986; BS 6399: Part1: 1996; Part2: 1997; Part 3: 1988 and BS648: 1964.
ANSI/TIA/EIA-222-G
Maximum allowable rotation in top Point...…........ (0.25 º Deg)
Safety factor: 2.0
Tower design as non-sway Self support structure
Main Load
1) Microwave Dish
Diameter................................... 1.2m + 1.8m
Weight.................................….. 100 + 135 kg
Location on the Tower ................. At the top, in any direction
NO of Microwave dish ................. (4*1.2m)+ (4*1.8m) pieces
2) GSM antennas
Diminutions...........................….…... 0.3x3x0.11
Weight...................................... 20 kg
Location on the mast ............... at the top, in any direction
NO of GSM antennas ........................... 6 pieces
Feeder (antennas cables)
Diameter ..............................…..... 7/8"
Weight ...................................... 5 kg / m
Location on the tower .........…......... From the bottom to the top
NO of cables .................. two cables for each GSM antennas
Secondary Load
Wind Load
Wind speed....................................150 km/h
Operational wind speed ...….................................... 112.5 Km/h
Temperature Load
(-7c° - 45c°) it is the ruing temperature in Yemen.
1.2. Soil Specification
Bearing capacity :-
0.9 Kg/Cm²
2 Kg/Cm²
3.5 Kg/Cm²
Dead loading
The self-weight of towers including ladders and platforms is based on nominal sizes of members with an appropriate allowance for gussets, bolts and welds.
Wind Loading
Two basic types of towers may be considered and this is
A) "heavy" range.
The heavy range should be designed for a basic wind speed of 41,666 m/s at an altitude of 150m. This data is preliminary and may be altered as soon as more accurate wind information data will be available.
Live Load
Individual members with an angle of 30º to the horizontal or less shall be designed to support a 1.5kN
vertical point load at mid span.
Towers shall be designed as Class "II" structures - exposure category "D" - topographic category (3) according to ANSI/TIA/EIA-222-G or equivalent by in BS 8100: Part 1: 1986; Figure 2.1. (Range between?(300 and 700) meters ) .
The serviceability check of the towers will be carried out in accordance with BS 8100 clause 3.3. Or equivalent by ANSI/TIA/EIA-222-G
The rotational displacement for any tower structure shall be limited to 0.5º measured at the highest dish level.
Steelwork
The plan shape of tower is square
For lattice towers all steelwork including angles, flats and round solid bars will be hot rolled Grade S275 or S355 to BS EN 10 025. Also steelwork circular hollow sections will be hot rolled S275 or S355 to BS EN 10 210.
Bolts will be hot dip galvanized in accordance with BS 7371: Part 6: 1998.
The work plats should distribution on height of tower each 10m, except the end work pleat should put on distance 3m from the top of tower.
Antenna supports
Each tower need the number of antenna supports as following:-
1- GSM antenna . . . . . . . . . . . . . . . . . . . . . . . 6 pieces
2- Microwave antenna . . . . . . . . . . . . . . . . . . 8 pieces
Concrete work
The concrete work should be designed by ACI-318M-05 requirements. Take care for following design
criteria:-
1- Concrete strength Fc/28days 21 MPa
2- Reinforcement strength Fy 280 MPa
3- The maximum bars size which use in design reinforcement concrete is 20mm. (Diameter of bar)
Access & Climbing
All base station towers shall be fitted with a access ladder in part complying with BS 4211. The access system shall also comprise a GlideLock/RailLock or similar approved system. Sufficient work platforms shall be provided each 10m height of tower.
Design life
Tower structures:
Minimum structural Design Life shall be 30 years.
Coating (Thickness of zinc)
Coating should not less 100 μm according ASTM A123 / A123M ( Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products ).
ICAO standard
Codas and Standards
British Standards/ Code of Practice and Euro standards or find the equivalent which is recommended by ANSI/TIA/EIA 222-G.
BS 648 Schedule of weights of building materials
BS 4211 Specification for ladders for permanent access to chimneys, other
high structures, silos & bins.
BS 4395 Specification for high strength friction grip bolts & associated nuts
& washers for structural engineering. General grade.
BS 5395 Stairs, ladders & walkways. Code of practice for the design,
Construction & maintenance of straight stairs & winders.
BS 5493 Code of practice for protective coating of iron & steel structures
Against corrosion.
BS 5930 Code of practice for site investigations.
BS 5950 Structural use of steelwork in building. Code of practice for design.
Rolled & welded sections.
BS 6399 Loading for building
BS 6651 Code of practice for protection of structures against lightning.
BS 7371 Part 6 / ASTM A123 - A123M : Specification for hot dipped galvanised coatings on
Fasteners or steel products .
BS 7430 Code of practice for earthing.
BS 8004 Code of practice for foundations.
BS 8100 Lattice Towers and Masts
BS EN 1011 Welding. Recommendations for welding of metallic materials.
General guidance for arc welding
Fabrication
A) Dimension and tolerance for angle are according to GB/T1591-1994, similar to EN 10056-1/2
B) Hot dip galvanization in accordance with GB/T 13912-2002, which similar to ASTM A 123
C) The welding will be performance in accordance with AWS D1.1 or CWB standard
Connections:
Bolts (ISO 8.8, SAE Grade 5, or ASTM A-325) + flat washers, nuts and spring
washers (5% hardware overage)
Anchoring: Anchor rods (ASTM F1554) used with leveling nuts and a positioning template
Shipment: Standard 20' to 40' ISO container
Documentation:
• Detailed packing list
• Installation & maintenance manual
• Foundation design
For this 25m four legged mobile communication tower and accessories, Our MEGATRO performs in-house design activities by PLS software or other software. Our Engineering Department is boasting of highly qualified engineering who are conversant with international codes and standards. The work is carried out with extensive use of CAE/CAD via a large of computer network. The computer hardware & drafting software are liked to the CNC workshop equipment for downloading of information thereby eliminating error and saving valuable production time.
After fabrication all poles are delivered to the galvanizing facility to be Hot Dip Galvanized. Poles are processed through the facility by Caustic Cleaning, Pickling, and then Fluxing. These strict procedures insure years of maintenance free towers.
Moreover, we offer cost effective range of development and installation service regarding as an additional installation service. These are further, designed for both government and civil communications and suitable for both far-off and short distance communications. For additional protection, we cover these with protective shield to prevent the radioactive fallouts.
Other information:
Availability size: Based on the customer's requirements.
Material: Chinese material or as per clients requirement
Package: Both parties discuss before delivery
Port of Loading: Qingdao Port
Lead Time: One month or based on the customer's needs
Minimum order: 1 set
Fabrication standard: Chinese Standard or other standard which client accepted
APPLICABLE STANDARD AND CODES
All towers manufactured and design shall be generally in accordance with latest revision of the following standards except where specifically directed otherwise.
General
IEC 60050 (151) International Electro-technical Vocabulary
Part 51 Electrical and Magnetic Devices
IEC 60050 (601) Chapter 601: Generation, transmission and distribution of electricity-General
IEC 60050 (601) Chapter 601: Generation, transmission and distribution of electricity-Operation
IEC 60059 IEC standard current ratings
Chinese Standard
No Code DESCRIPTION
1 GB/T2694-2003 Power Transmission line Steel tower - Technical requirements for manufacturing
2 JGJ81-2002 Technical specification for welding for steel structure of building
3 GB9787-88 Measuring and allowable tolerance for hot-rolled equal angle
4 GB709-88 Measuring and allowable tolerance for hot-rolled plate and strip
5 GB/T699-1999 Quality Carbon Structural Steel
6 GB/T1591-1994 Low alloy high strength structural Steel
7 GB700-88 Carbon Structural Steel
8 GB222-84 Method of sampling steel for determination of chemical composition and permissible variations
9 GB/T228-2002 Method for Tensile testing of metals
10 GB/T232-1999 Method for Bending test of metals
11 GB/T5117-1995 Carbon Welding Rod
12 GB/T5118-1995 Low Alloy Welding Rod
13 GB/T8110-1995 Welding wires for gas shielding arc welding of carbon and low alloy steels
14 GB/T10045-2001 Carbon steel flux cored electrodes for arc welding
15 JB/T7949-1999 Weld outer dimensions for steel construction
16 GB50205-2001 Test Standard for Acceptance of Steel Structure
17 GB/T470-1997 Zinc Ingot
18 GB3098.1-2000 Mechanical properties of fasteners-Part 1:Bolts, screws and studs
19 GB3098.2-2000 Mechanical properties of fasteners-Part2: Nuts, and thread
20 GB3098.3-2000 Mechanical properties of fasteners-Part3: Fastening screw
21 GB/T5780-2000 Helical Bolts Grade C
22 GB/T41-2000 Helical Nuts Grade C
23 GB/T90-2002 Flat Washer Grade C
24 GB/T13912-2002 Metal Coating, Technical Requirement and Test Method for Hot-dip galvanized Metal Parts
American Standards:
Standard Description
ASTM A6/A6M Standard specification for general requirements for rolled structural steel bars, plates, and sheet piling.
ASTM - 6 - General Requirements for delivery of Rolled Steel Plates, Shapes, sheet Piling Bars for structural used
ASTM A36/A36-M-97a Standard specification for Carbon structural steel
ASTM A123 / A123M-02 Standard specification for Zinc (Hot-Dip Galvanized) Coatings on iron and steel products
ASTM A143 / A143M-03 Standard Practise for Safeguarding Against Embitterment of Hot-Dip Galvanized Structural Steel Products and Procedure for Detecting Embitterment
ASTM A153/ A153M-05 Standard specification for zinc coating (Hot-Dip) on iron and steel hardware
ASTM A - 194 - Grade for bolt
ASTM A239 Standard practice for locating the thinnest spot in a zinc (Galvanized) Coating on Iron or Steel Articles
ASTM A242 Standard specification for High-Strength Low-Alloy Structural steel
ASTM A307 Standard Specification for Carbon Steel Bolts and Studs, 60000 PSI Tensile strength
ASTM A370-06 Standard Test Methods and Definitions for Mechanical Testing of Steel Products
ASTM A325 Standard Specification for structural bolts, steel, Heat treated 120/105 ksi minimum tensile strength
ASTM A-325 or A-354 - Galvanized hexagonal head of connection bolt
ASTM A325-97 Standard Specification for High-strength Bolts for structural steel Joints
ASTM A384 / A384M-02 Standard Practise for Safeguarding Against Warpage and Distortion During Hot-Dip Galvanizing of Steel Assemblies.
ASTM A394-93 Standard Specification for steel Transmission Tower, Bolts, Zinc Coated and Bare
ASTMA - 563 - Class and size of nuts
ASTMA - 572 - Chemical composition of steel
ASTM A572/A572-97c Standard specification for High-Strength Low-Alloy Columbium-Vanadium Structural steel
ASTMA - 615 - The anchor bolt material
ASTM A673 / A673M-07 Standard Specification for Sampling Procedure for Impact Testing of Structural Steel
ASTM B201 Standard practice for testing Chromatic coating on Zinc and Cadmium surfaces
ASTM E94-93 Standard Guide for Radiographic Testing
ASTM E 709-95 Standard Guide for Magnetic Particle Examination
ASCE Manual 72 - Load testing a simple structure
ASCE 10-97 Standard Design of latticed steel transmission structures
AWS D1.1 American Welding Society D1,1/D1,1M structural Welding code- Steel
ANSI B-182-2 Bolts, nuts and washers dimensions
DIN VDE 0101 - Isokeraunic Level
VDE 0201 - Climatic and environmental conditions
CVDE 0210 - Minimum safety factors under simultaneous working loads
ISO R898 Mechanical Properties of Fasteners
BS EN ISO 1461:1991 - High dip galvanized coatings on fabricated iron and steel articles. Specifications and standards
A) BS 5950: Welding Terms And Symbols
B) BS 729: Hot - Dip Galvanised Coating On Iron And Steel Articles
C) BS 2901: Filler Rods And Wires For Gas Shielded Arc Welding: Part 1 Ferritic Steels
D) BS 3692: ISO Metric Precision Hexagon Bolts, Screws And Nuts
E) BS 4360: Weldable Structural Steel
F ) BS 5135: Metal - Arc Welding Of Carbon And Carbon Manganese Steel
G) BS 5950: Part 1: Code Of Practice For Loading Latticed Tower & Masts
Part 2: Guide To The Background And Use Of Part 1"Code OF Practice For Loading"
Part 3: Strength Assessment of Members
H) DD 133 (1986): Code Of Practice For Loading Latticed Tower & Masts
I) BS 4592 (1987): Part 2: Specification For Expanded Metal Grating Panels
J) BS 4592 (1977): Code Of Practice For Protective Coating Of Iron And Steel Structure Against Corrosion
K) BS 4190: Bracing & Flanged Bolts
L) BS 4190: Rolled Steel sections, Flats & Plates
If any special requirement, we can design and discuss with client.
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