Megatro Tri-Angular Telecom Tower Mgt-B250FT

MEGATRO TRI-ANGULAR TELECOM TOWER MGT-B250FT
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:

1. Full Turn-Key provider including site acquisition, engineering services, manufacturing,   field services-DAS, tech services, value added reseller and monitoring, maintenance and network ownership
2. Specialize in developing supplying and building wireless and wired networks and in-building telecommunications systems, as well as energy infrastructure
3. Single source from Design to System Integration
4. 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:

1. Telecoms
2. Power transmission
3. TV and Radio Broadcast
4. Roads and City Development

Our complete selection of towers includes:

1. Self-supporting
2. Monopoles
3. Guyed towers
4. Custom-designed radar towers
5. Broadcast towers
6. Power transmission

MEGATRO also designs and manufactures tower related products including:

1. Fall protection
2. Antenna brackets
3. Other accessories if needed by clients

This photo refers to our integrated telecom tower and accessories products. They are combined products which we design and fabrication, even source other items for our clients.

Products scope:
1 Telecom tower and antenna mounts
2 Tower foundation plate and anchor bolts
3 Obstruction light (ICAO)
4 Cable tray
5 Shelter room
6 Lightning rod
7 Tower earthing kits and rod
8 ladder for cable and feeder
9 Painting serves
10 Design for tower and foundation
11 Other services as per client
&
 With technical data as follow:
• Available in heights of 50 to 120m
• Designed for medium to heavy loads
•Designed for primary cellular and MW backbone sites or central    communication hubs
• Lower freight cost due to freight efficiency
• Available with a large variety of accessories that can be easily mounted at any stage
• Enables easy reinforcement of legs at the site
• Modular design to fit a specific site design and enable last-minute modifications

Accessories:
• Working and rest platforms
• Horizontal cable gantries
• Antenna mounts
• Anti-climb guard & other safety devices
• Paint kit (ICAO standards)
• Obstruction lighting system
(ICAO standards)
• Lightning protection kit

Optimal Height:
50 to 120m (even more higher as per client requirements)

Design Standards:
TIA/EIA 222-G, or BS8100, EUROCODE 3 PART 3-1

Materials:
• Legs Q345B, or ASTM A572 GR50, or ST 52-3, or S355JR
• Braces and plates Q235B, or ASTM A36, or S235, Or ST 37-2
 Bolts: Chinese grade 6.8 and 8.8, which similar to ASTM A394

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)

Anti-Corrosion Treatment:
All steel elements are hot-dip galvanized (ASTM A123)
Paint kit (white/orange)

Anchoring:
Anchor rods (ASTM F1554) used with
leveling nuts and a positioning template

Ladder:
• Caged or open ladder with Safety climbing line or rail
• Usually installed inside the tower
• Option for attachment to any tower face
• Vertical cable hangers
Shipment:
Standard 20′ to 40′ ISO container
Documentation:
• Detailed packing list
• Installation & maintenance
manual
• Foundation design

For this 250ft telecom tower, mail technical data as follow:
1 type:
250-Feet 3-Legged Self-Supporting Tower made of hot-rolled steel sections.with an Equipment Shelter Room and Dismantle of existing 3-Legged Lattice guyed Tower. (Wind Speed: 130-220 Kph).

2 Tower Design Code:
ANSI/TIA-222G (Standard for Antenna Supporting Structures and Antennas).

3 Design Wind Speed:
i) Basic wind speed at 10m above the ground corresponding to an annual probability of 0.02 (50 years recurrence interval)
ii)Survival wind speed: 185kph& 225kph (3sec gust) (According to the wind speed of the respective districts)

4 Wind Load:
The Horizontal wind force applied to each section of tower structure and appurtenances
(Platform and Antennas) must be calculated in accordance with TIA-222-G standards. 

5 Exposure, Topographic Category:
Exposure Category: C
Topographic Category: 1

6 Slenderness ratio:
      i) For leg members = 120
     ii) Main compression members other than leg members = 200
     iii) Secondary members = 250

7 Minimum Member Size and Thickness at Top Section: (Which is gradually increased from top to bottom according to drawing and design approved by the BRTC BUET)

8 Minimum Number and size of Connection Members (Bolts) at Top Section: (Which is gradually increased from top to bottom according to drawing and design approved by the BRTC BUET)
 

9  Antenna Configurations for Tower:

i) 3 nos. of OMNI-1.8m (TID-400C)
ii) 2 nos. Perforated MW-2.0

10 Steelworks:
For steel works BS 4360 or BS EN10025 & BS8100 are preferred but any other equivalent codes can be followed.

11 Materials:
Angles, Gusset/ Splice Plates:
Hot rolled products of non-alloy structural steel.
Yield Stress fy (minimum)  = 275 Mpa (mild steel)
                                            400Mpa (minimum) (hot rolled high yield)
Bars
Steel bar to BS4449:1978
Yield stress fy = 250 Mpa (mild steel) or 460 Mpa (hot rolled high yield)

12 Galvanization:
Unless otherwise specified after completion of all fabrication process (including all drilling, punching, stamping, cutting, bending and welding) support steelwork, towers and tower steelwork, including nuts, bolts and washers shall be hot-dip galvanized and tested in accordance with the requirements of BS729 or ASTM 123M. Electro-galvanizing shall not be accepted. The minimum average coating thickness shall be 85 µm. The ingot zinc used for galvanizing shall comply with the requirements of BS 3436 or equivalent. All materials prior to galvanizing shall be free from oil, grease or any other substance which may adversely affect the quality of finish. All the bolts and screwed rods, including the threaded portions, shall be galvanized. The threads shall be cleaned of all surpluses on packing, clear of the ground and away from all materials that might stain or corrode the galvanizing.

13 Welding: BS 5135 or AWS D1.1

14 Bolts and Nuts:
Unless otherwise specified following grades of steel shall be applicable.
(a)Steel bolts for 12mm or below: ASTM 568 or grade 5.6 or Grade 275JR.
(b) Steel bolts for 16mm or above: ASTM 325 or Grade 8.8 or SAE 429.
(c) Nuts: ASTM 307 or Grade 275JR
(d) For Other Elements: Grade 275JR or ASTM A36

Unless otherwise specified bolts and nuts shall be of ISO Metric Black Hexagon to BS 4190 and shall be threaded ISO metric Course Pitch to BS 3643:Part2, Tolerance Class 7H/8g. All flat washer shall comply with the requirements of BS4320, Form E, Grade 4.6.Unless specified to the contrary they shall be 3mm thick. Single core spring washers shall comply with the requirements of BS 4464, Type B.

15 Anchor Bolts:
The anchor bolts shall be designed as per reaction forces the designer finds appropriate for his tower. The designer shall have the choice to consider plain or deformed bar.

16 Platform:
Towers shall have both rest and working platforms as per following specifications:
 

17 Illumination:
-Minimum luminous intensity shall be 32cd.
-Shall have optical lens arrangement to provide 360 degree illumination by red LEDs.
-Number of LED should not be less than 200.

18 Electronic Design:
-Voltage rating should be as low as possible (12V DC/AC)
-Power consumption less than 7 watt.
-Voltage across LED under all condition is 2V± 10%
-Operating temperature range is -10°Cto +60°C
-Photocell on/off.
-Shall be designed such that it can be given direct backup from battery.

19 Mechanical Design:
-Sealed water proofing unit.
-Casing made of special aluminum alloy (LM6), painted with
UV paint for atmospheric protection.
-Bird spike to keep away the droppings.
-Weight 2 kg (Approximately).
-Fire retardant.

20 Lightning Arrestor:
A lightning arrestor is a 16 mm diameter steel/brass rod of 2000 mm length with sufficient provision of fixing at tower top. The lightning arrestor shall be fixed on the tower top in a position just above the waveguides so that it does not impede climbing of a climber to the top of the tower. Also a 50 rm cable shall be connected between the lightning arrestor and the grounding/earthing connection.

21 Grounding:   Shall be less than 1 ohm. 

22 Tower:
The tower design shall be prepared using tower designing program. MS Tower/ PLS Tower/ TS Tower etc. which are verified, commercially available, comprehensive 3D structural engineering software with a direct emphasis on telecommunication tower design and analysis. Detailed printouts shall be attached to the report inclusive of input and output files. The wind load is applied to the tower in a full 360 degrees.

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 towers are delivered to the galvanizing facility to be Hot Dip Galvanized. Towers 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

American Standards:

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

Codes:
 

• AISC (American Institute of Steel Construction), “Specification for the Design, Fabrication and Erection of Structural Steel for Buildings.”Latest edition.
• ASCE (American Society of Civil Engineers Standard), “Design of Steel Transmission Tower Structures.” Standard 48-11
• ANSI/TIA/EIA 222G. ” Structural Standard for Steel Antenna Towers and Antenna Supporting Structures” 
• American Welding society (AWS), Structural Welding Code, AWS D1.1, latest edition.
• American National Standards Institute (ANSI), National Electrical Safety Code, ANSI C2, latest edition.
• Society for Protective Coatings (SSPC, formerly Steel Structure Painting Council)/National Association of Corrosion Engineers (NACE)/ Surface Preparations Specification and Practices (SSPC),Latest edition.
• BNBC (Bangladesh National Building Code, 2006 or later versions/draft)

Standards:
ASTM (American Society of Testing and Materials), latest revision.
Referred ASTM specifications:

• A6/A6M: Specification for General Requirements for Rolled Structural Bars, Plates, Shapes and Sheet Pilling.
• A36/A36M: Specification for Carbon Structural Steel.
• A123/A123M: Specification for Zinc (Hot-Dip galvanized) Coatings on Iron and Steel Products.
• A143:  Practice for Safeguarding Against Embrittlement of Hot-Dip Galvanized Structural Steel Products and Procedure for Detecting Embrittlement.
• A153/A153M: Specification for Zinc Coating (Hot-Dip) on Iron and Steel Hardware.
• A325: Specifications for High-Strength Bolts for Structural Steel Joints.
• A354: Specification for Quenched and Tempered Alloy Steel Bolts, Studs, and Other Externally Threaded Fasteners.
• A370: Test Methods and Definitions for Mechanical Testing of Steel Products.
• A384: Practice for Safeguarding Against Warpage and Distortion During Hot-Dip Galvanizing of Steel Assembles.
• A570/A570M: Specification for Steel, Sheet and Strip, Carbon, Hot-Rolled, Structural Quality.
• A572/A572M: for High Strength Low-Alloy Structural Steel with 50 ksi Minimum Yield Point to 4 in.Thick.
• A595: Specification for Steel Tubes, Low-Carbon, Tapered for Structural Use.
• A607: for Steel, Sheet and Strip, High-Strength, Low-Alloy, Columbium or Vanadium, or Both, Hot-Rolled and Cold-Rolled.
• A673/A673M: Specification for Sampling Procedure for Impact Testing of Structural Steel.
• A687: Specifications for High-Strength Non headed Steel Bolts and Studs.
• A871/A871M: Specification for High Strength Low-Alloy Structural Steel Plate with Atmospheric Corrosion Resistance.
• BS 4360: Specification for weld able steel structure
• BS 729: Hot-Dip Galvanized coating on iron steel articles.
• ISO or equivalent: Bolts, Nuts and washers.
• BS 4449: British Standard for Reinforcing Steel.
• BS 3436: Specification for ingot zinc
• BS 5135: Specification for arc welding of carbon and carbon manganese steels AWS D1.1: Structural Welding Code-Steel
• Exposure Category C: Open terrain with scattered obstructions having heights generally less than 30ft [9.1 m]. This category includes flat, open country, grasslands and shorelines in Hurricane prone regions.
• Topographic Category 1: No abrupt changes in general topography, e.g. flat or rolling terrain, no wind speed-up consideration shall be required.

If any special requirement, we can design and discuss with client.