Transmission Tower (MG-EA001)

Our company, QINGDAO MEGATRO HOLDING, CO., LIMITED, is a full service engineering and manufacturing company with a global reputation for delivering excellence and innovation in tower supply. We have over 10 years of experience and innovation in engineering, designing, and building towers.MEGATRO fabricates every structure from the ground up. Our power transmission line steel towers or telecom tower or other structures are constructed of solid steel legs and angle iron cross members & pipes. Structures can reach heights up to 200 meter, or we can design as per client special requirements.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. Our transmission tower or telecom tower 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 loadExceptional loads
1 Switching forces
2 short-circuit forces
3 Loss of conductor tension
4 Earthquake forcesWe design all kinds of towers and posts or other steel structures for:
a.Telecoms
b.Power transmission
c.TV and Radio Broadcast
d.Roads and City DevelopmentOur complete selection of towers includes:
a.Self-supporting
b.Monopoles
c.Guyed towers
d.Custom-designed radar towers
e.Broadcast towers
f.Power transmissionMEGATRO is one of the few manufactures who assemble a face of every tower section. 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. Till now Megatro can produce and take any power transmission line tower, substation and other supports. Tower support power voltage as follow:4kv, 4.8kv, 12kv, 13.2kv, 22KV, 23kv, 24KV,24.9kv, 27.6kv, 33kv, 34.5kv, 35kv, 46kv, 66kv, 69kv, 110kv, 115kv, 132kv, 138kv, 150kv, 154kv, 161kv, 220kv, 230kv, 275kv, 287kv, 330KV, 345kv, 380kv, 400kv, 500kv, 735kv, 750kv, 765kv, 800kv, 1000kv, 1100kv, towers including angular tower, tubular tower; SST tower and guyed tower; Single circuit tower, double circuit tower and multi - circuit tower; Lattice tower or monopole tower; H- frame, M-type tower, T-type tower, Y-type tower; And every type of utility poles, transmission &distribution poles, switch poles; Substation frameworks etc.
In tower shape ,we have type as follow:
(1) horizontal configuration
(2) vertical configuration
(3) delta configuration
(4) Self-supproted delta structure
(5) H-Fram structure
(6) Guyed-vice structure
(7) Monopole typeMEGATRO 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 DrawingsMEGATRO 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. MEGATRO is one of the few manufactures who assemble a face of power transmission 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 allpower transmission steel towersare 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. MEGATRO'power transmission steel towerssystems 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
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 acceptedSteel grades
Tower legs: Chinese steel Q345B, which same to ASTM A572 GR50
Other webs, bracing and not stress plate and angle steel: Chinese Q2230B, which same to ASTM A36
Plates: Chinese steel Q345B, which same to ASTM A572 GR50
Bolts: Chinese grade 6.8 and 8.8, which similar to ASTM A394
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 standardIf client have other requirements, we can design according to client technical specification and requiremetns.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.ShearingShearing 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. BendingBending 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, shieldwire, insulators or associated assemblies or brackets.Sub-punchingAll 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 crossarms 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.PunchingFor 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 SizeWhere 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.
AccuracyAll 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 TolerancesA specification for tolerances shall be submitted for approval by the Engineer prior to commencement of fabrication.Bolt ListA complete list of bolts showing their lengths and the members, which they are to connect shall be given on the erection diagrams.Locking DevicesLocking devices for tower bolts will not be required, but point punching shall be performed.Anti-theft FastenersAppropriate 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 MarksAll 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.GalvanizingAll 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.
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 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 8110 - 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
NoCodeDEscriptION1GB/T2694-2003Power Transmission line Steel tower - Technical requirements for manufacturing2JGJ81-20023GB9787-884GB709-885GB/T699-19996GB/T1591-19947GB700-888GB222-849GB/T228-200210GB/T232-199911GB/T5117-199512GB/T5118-199513GB/T8110-199514GB/T10045-200115JB/T7949-199916GB50205-200117GB/T470-199718GB3098.1-200019GB3098.2-200020GB3098.3-200021GB/T5780-200022GB/T41-200023GB/T90-200224GB/T13912-2002
American Standards:
StandardDescriptionASTM A6/A6MASTM - 6 ASTM A36/A36-M-97aASTM A123 / A123M-02ASTM A143 / A143M-03ASTM A153/ A153M-05ASTM A - 194 ASTM A239ASTM A242ASTM A307ASTM A370-06ASTM A325ASTM A-325 or A-354 ASTM A325-97ASTM A384 / A384M-02ASTM A394-93ASTMA - 563ASTMA - 572 ASTM A572/A572-97cASTMA - 615 ASTM A673 / A673M-07ASTM B201ASTM E94-93ASTM E 709-95ASCE Manual 72 ASCE 10-97AWS D1.1ANSI B-182-2
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 & PlatesIf any special requirement, we can design and discuss with client.