220kv 2D2 Sj1 Double Circuit Transmission Tower

/ January 02, 2019

Model NO.: MGP-220-2D2SJ1
Structure: According to Client′s Technical Specification
Design Software: Pls Pole & Tower
Accessories 1: Power Fitting
Accessories 2: Conductor and Cable
Accessories 3: Tower Earthing Kits
Trademark: MEGATRO
Transport Package: Export Standard Package
Specification: AS PER CLIENT
Origin: Shandong, China
HS Code: 73082000
Model NO.: MGP-220-2D2SJ1
Structure: According to Client′s Technical Specification
Design Software: Pls Pole & Tower
Accessories 1: Power Fitting
Accessories 2: Conductor and Cable
Accessories 3: Tower Earthing Kits
Trademark: MEGATRO
Transport Package: Export Standard Package
Specification: AS PER CLIENT
Origin: Shandong, China
HS Code: 73082000
220KV 2D2 SJ1 double circuit transmission tower 
220kv 2D2 Sj1 Double Circuit Transmission Tower

This photo refers to our 220KV 2D2 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 (ºC) 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 29 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
2D2 SJ1  
18~30 		 
30 		 
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)
   Tx Ty Nmax Nx NY
2D2 SJ1  
10095~12392 		702~739 94~96
 		 92~94
 		 904~961 119~123 113~118
 
4Here is the design strength of Chinese tower steel 
Steel material  Anti-push, bending and press strength (N/mm2) Anti-shear strength 
(N/mm2)
Grade  Thickness or diameter (mm)
Q235
Steel  		≤16 215 125
>16~40 205 120
>40~60 200 115
>60~100 190 110
Q345
Steel  		≤16 310 180
>16~35 295 170
>35~50 265 155
>50~100 250 145
Q420
Steel  		≤16 380 220
>16~35 360 210
>35~50 340 195
>50~100 325 185
Q460
Steel  		≤16 415 240
>16~35 395 230
>35~50 380 220
>50~100 360 210
 
5 Here is the design strength of our Chinese tower bolts 
Item  Grade  Anti-push strength (N/mm2) Anti-shear strength (N/mm2)
Fastener 
for towers  		4.8 200 170
5.8 240 210
6.8 300 240
8.8 400 300
Anchor
 bolts  		Q235 160 /
Chinese 35 steel  190 /
Chinese 45 steel  215 /
 
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 2D2 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:
  • 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:
  1. Telecoms
  2. Power transmission
  3. TV and Radio Broadcast
  4. Roads and City Development
  5. Wind energy solution 
  6. Steel structure and workshop 
 
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

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 2D2 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 2D2 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. 
 
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 2D2 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
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   
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 5o, 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.
 
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.
 
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 mem

Street Lighting Pole

Traffic Sign Structure,Telescopic Camera Mast Pole,Traffic Sign Lamp Pole

Xinjinlei Steel Industry Co., Ltd. , http://www.xjlpole.com

You may also like