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MEGATRO 220KV SDJB tension transmission line lattice steel tower

Qingdao Megatro Mechanical and Electrical Equipment Co., Ltd.

MEGATRO 220KV SDJB tension transmission line lattice steel tower

Place of Origin : qingdao of china

Brand Name : MEGATRO

Certification : ISO9001 , ISO14001

Model Number : megatro 220KV SDJB tension transmission line lattice steel tower;POWER TRANSMISSION LATTICE TOWER;2

MOQ : 1ton



Delivery Time : 30 DAYS OR AS PER CLINET

Payment Terms : TT/LC

Supply Ability : 50000TONS/YEAR

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220KV SDJB double circuit tension transmission tower

This photo refers to our 220KV SDJB double circuit transmission line lattice steel tower, it have double earth wire, and It is tension angle type tower, Some of technical features of this tower as follow:

Application scope

220kv transmission line

Tower name

tension and angle tower

Tower type


Design condition

Nominal Height(m)

Tower weight(kg)

Conductor type




Earth wire type




Max. Wind speed(m/s)


Max. Ice(mm)


Horizontal span(m)


Vertical span(m)



60°~90° angle 0°~90° terminal

Remark: above technical data only references for our client, we can design every type for our overseas clients.

MEGATRO is a full service engineering company with a global reputation for delivering excellence and innovation in power transmission, transformation, distribution, and telecommunications systems. Our MEGATRO provide and design this type 220KV SDJB double circuit transmission line lattice steel tower mainly for our overseas client. Since 2004, MEGATRO focus mainly international market and had export many kind of transmission structures to overseas clients. MEGATRO has been manufacturing lattice transmission tower & tapered steel poles for lighting, traffic control, communication and utility applications. MEGATRO pioneered the development of transmission tower, telecom tower, substation, and other steel structure and was also at the forefront in the design of Transmission tower.

Over 10 years of experience and innovation in engineering, designing and building towers has evolved MEGATRO into its current form:

l Full Turn-Key provider including site acquisition, engineering services, manufacturing, field services-DAS, tech services, value added reseller and monitoring, maintenance and network ownership

l Specialize in developing supplying and building wireless and wired networks and in-building telecommunications systems, as well as energy infrastructure

l Single source from Design to System Integration

l 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 energy solution

f. Steel structure and workshop

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

Today, with over 10 years of experience and our commitment to excellence, MEGATRO remains an industry leader in the manufacture and design of steel tubular & angular & monopole structures for all Highway, Municipal, Custom, telecom, lighting and electric Utility applications. MEGATRO has a complete staff of professional engineering personnel trained in the PLS Pole program and three different manufacturing processes for producing steel towers, poles and other supports. We utilize the latest versions of PLS-CADD, PLS-POLE, TOWER, AutoCAD and other CAD software.

The structure shall be designed according to load combinations given as per IEC 61936-1 and as illustrated below:
Normal loads
1 Dead weight load
2 Tension load
3 Erection load
4 wind load

Exceptional loads
1 Switching forces
2 short-circuit forces
3 Loss of conductor tension
4 Earthquake forces

Moreover, MEGATRO is fully equipped and qualified to carry out Design Engineering services which includes:

√ Overhead Transmission line steel tower & Telecom steel tower

Basic Design and Analysis

√ Shop Erection Drawings

√ As-Built Drawings

MEGATRO performs in-house design activities specializing in electrical overhead transmission &telecom tower steel works, which include wind and earthquake loading, static analysis, stress analysis by finite element methods and fatigue. 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.

Besides, MEGATRO is one of the few manufactures who assemble a face of 220KV SDJB double circuit transmission line lattice steel tower. This attention to quality may not be the cheapest process but it does insure every tower meets our high standards of quality. And it helps to reduce on-site construction cost due to mismatched assemblies. After fabrication all 220KV SDJB double circuit transmission line lattice steel 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. All finished surfaces shall be level and free of tears, burrs, clots and impurities.

Except otherwise specified elsewhere in the specification, the surface treatment and corrosion protection for all metal parts shall be in conformity with the latest revision of the standards listed below:

ASTM A 123 zinc (hot-dipped galvanized) coating on iron and steel products

DIN 55928 Protective painting of steel structure instructions

DIN 55945 Painting materials-Notions

DIN 18363 Paint work-Buildings

DIN 18364 Surface protection work for steel

DIN 53210 Determination of rust degree

DIN 55151 Determination of adhesion

ISO4628/3 Determination of rust penetration

MEGATRO' 220KV SDJB double circuit transmission line lattice steel tower systems can accommodate a variety of cross-arm. MEGATRO also offers a wide variety of accessories and mounts.

Other information:
Availability size: Based on the customer's requirements.
Material: Chinese material or as per clients requirement
Steel grades
Tower legs: Chinese steel Q345B, which equivalent to ASTM A572 GR50
Other webs, bracing and not stress plate and angle steel: Chinese Q235B, which equivalent to ASTM A36

Plates: Chinese steel Q345B, which equivalent to ASTM A572 GR50
Bolts: Bolt quality shall be Chinese Class 6.8 and 8.8, as per our Chinese standard, or ISO 898 standard or ASTM A394 type 0,1,2,3 requirements

The anti-theft bolts shall be Huckbolt Fasteners or approved equivalent. The fasteners shall be manufactured from high tensile steel A242 or equivalent and hot-dip galvanized in accordance with ASTM specification A153 and A394.

Fabrication standard: Chinese Standard or other standard which client accepted
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

D) All fastener galvanization conform to ASTM A153 requirements.

Package: Both parties discuss before delivery
Port of Loading: Qingdao Port
Lead Time: One month or based on the customer's needs (For time being our capacity about 5000 tons one month, and can meet client requirements)
Minimum order: 1 set

General Fabrication Requirements

Here is general fabrication requirements for our transmission tower; however, both parties must discuss all drawings and confirm all shop drawings, technical specification, and which standard to conform.

Before mass production, we must received all signed approved shop drawings and technical documents from our client.

Our Fabrication shall be in strict accordance with detail Drawings prepared by the Contractor and approved by the Engineer. Fabrication shall begin after the approval of the shop assembly and tests.


Shearing and cutting shall be performed carefully and all portions of the work which will be exposed to view after completion shall be finished neatly. Manually guided cutting torches shall not be used.

All material over 13 (or 12) mm thick shall be cold sawn or machine flame cut.

Cropping or shearing shall be allowed for material thickness of 13 mm or less.

Flame cutting of high yield steel shall be preceded by a slight preheat operation by passing the cutting flame over the part to be cut.

All flame-cut edges shall be ground clean.


Bending shall be carried out in such a manner as to avoid indentation and surface damage. All bending over 5o, or high yield steel, shall be performed while the material is hot.


No welding shall be done unless prior approval has been obtained from the Engineer.

Welding shall not be allowed at tower attachment points for conductor, shield-wire, insulators or associated assemblies or brackets.


All holes in structural steel less than 10 mm thickness may be punched to full size unless otherwise noted on the approved Drawings. Holes shown on the Drawings as drilled holes and all holes in structural steel 10 mm or more in thickness and tension members of cross-arms shall be drilled or sub-punched and reamed.

All holes shall be clean cut and without torn or ragged edges. All burrs resulting from reaming or drilling shall be removed. All holes shall be cylindrical and perpendicular to the member.

Where necessary to avoid distortion of the holes, holes close to the points of bends shall be made after bending.


For punching to full size, the diameter of the punch shall be 1.0 mm larger than the nominal diameter of the bolt, and the diameter of the die shall not be more than 1.5mm larger than the diameter of the punch. For sub-punching, the diameter of the punch shall be 4 mm smaller than the nominal diameter of the bolt, and the diameter of the die shall be not more than 2 mm larger than the diameter of the punch. Sub-punching for reamed work shall be such that after reaming no punch surface shall appear in the periphery of the hole.

Hole Size

Where holes are reamed or drilled, the diameter of the finished hole shall be not greater than the nominal diameter of the bolt plus 1.0 mm.


All holes shall be spaced accurately in accordance with the Drawings and shall be located on the gauge lines.

The maximum allowable variation in hole spacing from that indicated on the Drawings for all bolt holes shall be 0.8 mm.

Fabrication Tolerances

A specification for tolerances shall be submitted for approval by the Engineer prior to commencement of fabrication.

Bolt List

A complete list of bolts showing their lengths and the members, which they are to connect shall be given on the erection diagrams.

Step bolt:

Each steel tower shall be provided with step bolts on one of the legs for single circuit steel tower and on two diagonally opposite legs for double circuit steel tower from approximately 2.5 meters above ground level to the cross arm and from thereon to each ground wire peak. Step bolts shall be furnished for each leg extension in an amount of 25% of the step bolt holes. These bolts shall not be less than 16 mm or 3/4" diameter, double nut type, 18 cm or 7" long with 35 mm or 1 5/8"diameter, symmetrical head, two hexagon nuts and spring washers, spaced not more than 45 cm or 18" apart. Each bolt shall withstand without permanent deformation a vertical load of at least 137 kg applied at the bolt head. If any technical specification, we will discuss with our client and confirm before mass production.

Locking Devices

Locking devices for tower bolts will not be required, but point punching shall be performed.

Anti-theft Fasteners

Appropriate anti-theft fasteners for example Huck-bolting shall be applied on all the towers up to the level of anti-climbing devices, to prevent theft of tower members.

Piece Marks

All pieces shall be stamped before galvanizing with the piece marks shown on the erection Drawings, with the marking not less than 20 mm high placed in the same relative location on all pieces. The marking shall be plainly visible after galvanizing.


All material shall be hot-dip galvanized after fabrication in accordance with the latest revision of GB/T 13912-2002 or ASTM Specification A 123.

Material that has been rejected because of bare spots or other coating defects shall either be stripped and re-galvanized, or the uncoated areas shall be recoated by an approved method.

All plates and shapes which have been warped by the galvanizing process shall be straightened by being re-rolled or pressed. The material shall not be hammered or otherwise straightened in a manner that will injure the protective coating.

Approval shall be secured from the Engineer if galvanizing is done outside of the Contractor's plant.

All galvanized steelwork shall be protected against white storage stain by using an approved dichromate solution treatment immediately following galvanizing.

Shop Assembly and Inspection

All built-up assemblies shall be shop bolted complete with washers, after galvanizing, and shipped as a unit. When specified in the Purchase Order, MEGATRO shall completely assemble in the presence of Owner one (1) structure of each type before the first shipment of such structures. Any errors in the shop detail drawings or shop work shown by this assembly shall be immediately corrected. MEGATRO's proposal shall include the work required for these shop assemblies. Any material rejected by Owner for failure to conform with this specification or the Purchase Order shall be corrected or replaced by MEGATRO. The fact that material has been inspected, or Owner has waived the right to inspect any material, shall not prevent rejection of the material if it is found not to be in proper condition o r to have fabrication inaccuracies preventing proper assembly.

Design Calculations and Drawings

Our MEGATRO can perform complete design calculations, design drawings and shop detail drawings of each structure and submit checked calculations and drawings for Owner's review and distribution in the quantity, manner and time set forth in the Purchase Order. Our drawings consist of the following:

Design drawings showing structure dimensions, conductor clearance diagrams and schedule of member sizes, bolt sizes and material specifications.

Erection drawings showing each individual member with its identification mark, location and position of outstanding leg of angles, with number, diameter and length of bolts for connection; and typical details to large scale where a number of members frame together.

Shop detail drawings showing all dimensions, draw for tension diagonals, and all shearing punching, bevel cutting, grinding, bending and identification mark for each member.

A complete Bill of Material for each structure showing the number, kind, size, length, weight and identification mark for each member including all bolts.

(Remark: only PO confirmed, our MEGATRO can start shop drawings for client.)


All pieces shall be distinctively marked with erection marks clearly visible after galvanizing, corresponding to those on the erection drawings. Steel tower steel stamping dies, minimum 16 mm or 5/8" high, shall be used and special care shall be taken to see that all erection marks are made in such a manner as not to be obliterated in transit, or in any way damage the galvanizing or impair the strength of the member.

In marking the members, each marking shall be prefixed by letters, which indicate the type of the steel tower. For members that are used in more than one type of steel tower, all steel tower-type designations shall appear on the marking.

In addition, the members shall be marked with water -proof ink stencil 25 mm. or 1.0" high after galvanizing to facilitate in yarding the members and erecting the steel towers.

The diameter and the length of the bolt shall be marked on each bolt end so as to be visible after galvanizing.

An additional Contractor identification mark shall be stamped immediately in front of the piece identification marks. This Contractor identification mark shall be submitted to Owner for acceptance and registration prior to first use.

Identification marks shall be located conspicuously to permit easy reading. Marking of like pieces shall be identical in location, and pieces over 14 feet in length shall be marked at both ends.

Identification marks shall be applied as follows:

Before galvanizing stamp with 2.0mm deep, 15.0mm minimum height steel die letters and numerals. After galvanizing neatly stencil a 6.0mm wide straight line, to underline the identification marks, made with durable paint or ink that will adhere to the galvanized surface and remain legible.

All small items that are not adaptable to die marking and are not boxed shall be identified by either attaching die stamped steel tags or plastic tags with permanent markings. The tags shall be attached with non-corrosive wire.

Preparation for Shipping and Storage

To facilitate segregation of steel tower parts at the stockyard and to maximize the efficiency of erection, packaging of steel towers shall be as follows:

All steel tower parts, including stub angles, plates and steel tower parts member shall be color coded. The color code shall be painted on both ends of the steel tower parts for all angular members and around the edges for plates. The color codes shall be as specified in the Technical Data Sheets. All stub angles shall be packaged per unit steel tower per type i.e., four (4) pieces per bundle.

All cleats including bolts and nuts with spring washers for stub angles shall be packaged per unit steel tower per type in wooden boxes with corresponding color code painted on all corners of the box.

All basic body steel towers shall be packaged per unit steel tower per type. Each package shall not exceed three (3) metric tons. The contents of each package per unit steel tower per type shall be identical for any succeeding unit type. The numbering of each package shall indicate steel tower type (basic), steel tower number and number of pieces included in the package.


MG -Basic/Steel tower No./Package No./Qty. in this package

MG -Basic/ 1 of 200/ 2/ 8

All bolts and nuts with spring washers shall be package in tin cans or wooden boxes per unit steel tower per type and numbered as follows:


MG Bolts (Basic)/Steel tower No./Package No./Quantity

All plates and gussets for the basic steel tower shall be package in wooden boxes per unit steel tower per type and numbered as follows:


MG Plates (Basic)/Steel tower No./Package No./Quantity

All body extension steel tower parts shall be package per unit steel tower per type. The weight of each package shall not be more than three (3) metric tons. The contents of each package per unit per steel tower shall be identical for any succeeding unit steel tower. The numbering of each package shall indicate the steel tower type and extension steel tower number, and number of pieces included in the package.


MG Body Ext./Steel tower No./Package No./Quantity

MG Body Ext./Steel tower No./Package No./Quantity

All bolts and nuts with washers and plates for the body extensions shall be packaged in wooden boxes per unit steel tower per type and numbered as follows:


MG Plates & Bolts/Steel tower No./Package No./Quantity

All steel tower parts/members shall be marked as indicated in the steel tower parts list. The markings shall be embossed, the size of which will be approved by the our client.

All package numbers for the steel tower shall be in label form. The size of the label shall be 5 cm x 10 cm. The label shall be waterproof and all letterings on the label shall be printed. This label shall be attached on every bundle of package. Each bundle or package shall have at least two (2) labels, each label is visible on each side of the bundle.

All bundle or packages for steel tower shall be properly strapped to avoid disintegration of the bundle when subjected to unnecessary impact. The strap shall be properly placed so that the breakage of one (1) or two (2) straps will not allow disintegration of the bundle or package.

Smaller pieces shall be bundled, with all the pieces in any bundle having the same mark.

All small pieces such as bolts and connections for ground wire and insulators shall be packed in boxes of not over 70 kg gross weight each. Bolts of different size or length shall be wrapped in separate sacks before boxing. Description, quantity, bolt size, and length shall be clearly marked on the outside of the sacks and boxes.

When specified in the Purchase Order, bundling and packaging shall be in lots for each individual structure. Boxes or other containers shall be clearly marked to indicate the type of steel tower for which the enclosed material is intended, and the quantity and marks or description of contents shall be shown on the outside.

Shipping shall be as specified by the Purchase Order and shall be in complete steel tower lots. All identifications shown on bundles, boxes or other containers shall be included on Contractor's shipping and packaging lists.


All towers manufactured and design shall be generally in accordance with latest revision of the following standards except where specifically directed otherwise.


IEC 60826 - Design criteria of overhead lines

IEC 60652 - Loading tests on overhead line structures

ISO 1459 - Metallic coatings - Protection against corrosion by Hot Dip Galvanizing

ISO 1461 - Hot dip galvanized coatings on fabricated iron and steel articles

ISO 12944 - Paint coatings, corrosion protection, and structural steelwork

ISO 898-1 - Mechanical properties of fasteners. Part 1-Bolts, Screws and studs

ISO 630 - Structural Steels - plates, wide flats, bars, sections and profiles

ISO 657 - Hot rolled structural steel plates tolerances on dimensions and shape

ISO 7411 - Hexagon Bolts for high strength structural bolting with large width across flats

ISO 657-5 - Hot rolled Structural Steel Sections equal and unequal leg angles

ISO 7452 - Hot rolled structural steel plates tolerances on dimensions and shape

BS EN 50341-1 - Overhead electrical lines exceeding AC 45kV –General Requirements

BS 8004 - Code of Practice for Foundations

BS 8220 - Structural use of concrete

ANSI10-97 - Design of latticed steel transmission structures

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






Power Transmission line Steel tower - Technical requirements for manufacturing



Technical specification for welding for steel structure of building



Measuring and allowable tolerance for hot-rolled equal angle



Measuring and allowable tolerance for hot-rolled plate and strip



Quality Carbon Structural Steel



Low alloy high strength structural Steel



Carbon Structural Steel



Method of sampling steel for determination of chemical composition and permissible variations



Method for Tensile testing of metals



Method for Bending test of metals



Carbon Welding Rod



Low Alloy Welding Rod



Welding wires for gas shielding arc welding of carbon and low alloy steels



Carbon steel flux cored electrodes for arc welding



Weld outer dimensions for steel construction



Test Standard for Acceptance of Steel Structure



Zinc Ingot



Mechanical properties of fasteners-Part 1:Bolts, screws and studs



Mechanical properties of fasteners-Part2: Nuts, and thread



Mechanical properties of fasteners-Part3: Fastening screw



Helical Bolts Grade C



Helical Nuts Grade C



Flat Washer Grade C



Metal Coating, Technical Requirement and Test Method for Hot-dip galvanized Metal Parts

American Standards:




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


Standard practice for locating the thinnest spot in a zinc (Galvanized) Coating on Iron or Steel Articles


Standard specification for High-Strength Low-Alloy Structural steel


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


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


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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