this Photo refers to our 220KV 2D1 SJ1 double circuit transmission tower, it is Widely used in our Chinese market. Some of technical Features of this tower as follow:

1 climate condition

Item	Temperature (℃)	Wind speed (m/s)	Ice thickness (mm)
Max. Temperature	40	0	0
Mini. Temperature	-40	0	0
Ice thickness	-5	10	10
Basic wind speed	-5	27	0
Installation condition	-15	10	0
Annual temperature	5	0	0
Lightning overvoltage	15	10	0
Operation overvoltage	5	15	0
Hot-line work	15	10	0

 

2 tower design data

 

Tower type	Nominal Height scope (mm)	Nominal Height (mm)	Horizontal span (m)	Vertical Span (m)	Angle o	Insulator Type	Horizontal Span at angel condition
2D1 SJ1	18～27	27	450	650	0～20	/	/
Conductor type: 2×LGL-300/40					OPGW: JLB-150

 

3 Tower estimated weight and foundation force

Tower Type	Tower weight Scope (kg)	Foundation force scope (KN)
		Tmax	Tx	Ty	Nmax	Nx	NY
2D1 SJ1	16673～19998	580～885	79～115	75～110	938～1036	122～134	118～130

220KV 2D1 SJ1 double circuit transmission tower mainly for our Chinese and 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.

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.

Moreover,MEGATROIs 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

 

MEGATROPerforms 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.

 

 220KV 2D1 SJ1 double circuit transmission 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 2D1 SJ1 double circuit transmission 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.

MEGATRO' 220KV 2D1 SJ1 double circuit transmission 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
PortofLoading:QingdaoPort
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   

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

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

 

Welding

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.

 

Sub-punching

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.

 

Punching

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.

Accuracy

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.

 

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.

 

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: onlyPOconfirmed, our MEGATRO can start shop drawings for client.)

Marking

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.