110KV heavy angle transmission tension pole in South East Asia This photo refers to our 110KV heavy angle transmission tension pole in south east Asian countries, which we exported them with large quantity. Their technical specification as follow:
1
Line details - Circuit (DC) & KV.
DC, 110 KV
2
Number of phases.
3
3
Tower details
Wind span
Weight Span
Tension towers
140
200
Max. wind speed (m/s)
35
Angle  (° )
60
4
Conductors Type ( ACSR/AAAC/etc)
Single Partridge (157.22mm2) ACSR conductor
Conductor - Single/twin/quad/hexa
Single
5
Earth-wireÂ
Two shield-wires OPGW
6
Insulators.
110 KV LONG ROD POLYMERIC
7
Factor of safety.
1.5
8
Environmental condition of area (Temp).
Design Ambient Temperature 40 DegC
9
Tower Height.
24 Mtr. (Subject to approval )
10
Design Code
ASCE Manual No -72, IS 802 (part I & part II)-1997, IS 5613 (part I & part II), transmission line manual (publication no -268 )
11
Type of Soil (Normal / Black cotton)
 Loose blackish & dark grey clayey silty fine sand
12
Tower cross section
Regular polygon tubular 12 sides
13
Cross arm section
Regular polygon tubular 8 sides
14
Production requirements
Welding penetration at base plate at least 90% Welding penetration at connect plate at least 90% Welding penetration at long tower at least 80% Other welding penetration at least 70%
15
Raw material steel grade
Tower and cross-arm: ASTM A572 GR50 Base plate: Q235B Ladder: Q235B Anchor bolt: Chinese grade 6.8 Other bolt: Chinese grade 4.8
We also provide power fitting, insulator, painting and design services for our clients
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 110KV heavy angle transmission tension pole 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, MEGATROis one of the few manufactures who assemble a face of 110KV heavy angle transmission tension pole. 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 110KV heavy angle transmission tension poles 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. MEGATRO' 110KV heavy angle transmission tension poles systems can accommodate a variety of cross-arm. MEGATRO also offers a wide variety of accessories and mounts.
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.  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.   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
No
Code
DESCRIPTION
1
GB/T2694-2003
Power Transmission line Steel tower - Technical requirements for manufacturing
2
JGJ81-2002
Technical specification for welding for steel structure of building
3
GB9787-88
Measuring and allowable tolerance for hot-rolled equal angle
4
GB709-88
Measuring and allowable tolerance for hot-rolled plate and strip
5
GB/T699-1999
Quality Carbon Structural Steel
6
GB/T1591-1994
Low alloy high strength structural Steel
7
GB700-88
Carbon Structural Steel
8
GB222-84
Method of sampling steel for determination of chemical composition and permissible variations
9
GB/T228-2002
Method for Tensile testing of metals
10
GB/T232-1999
Method for Bending test of metals
11
GB/T5117-1995
Carbon Welding Rod
12
GB/T5118-1995
Low Alloy Welding Rod
13
GB/T8110-1995
Welding wires for gas shielding arc welding of carbon and low alloy steels
14
GB/T10045-2001
Carbon steel flux cored electrodes for arc welding
15
JB/T7949-1999
Weld outer dimensions for steel construction
16
GB50205-2001
Test Standard for Acceptance of Steel Structure
17
GB/T470-1997
Zinc Ingot
18
GB3098.1-2000
Mechanical properties of fasteners-Part 1:Bolts, screws and studs
19
GB3098.2-2000
Mechanical properties of fasteners-Part2: Nuts, and thread
20
GB3098.3-2000
Mechanical properties of fasteners-Part3: Fastening screw
21
GB/T5780-2000
Helical Bolts Grade C
22
GB/T41-2000
Helical Nuts Grade C
23
GB/T90-2002
Flat Washer Grade C
24
GB/T13912-2002
Metal Coating, Technical Requirement and Test Method for Hot-dip galvanized Metal Parts
Â
 American Standards:
Standard
Description
ASTM A6/A6M
Standard specification for general requirements for rolled structural steel bars, plates, and sheet piling.
ASTM - 6Â Â Â
- 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 - 194Â
-Â Â Grade for bolt
ASTM A239
Standard practice for locating the thinnest spot in a zinc (Galvanized) Coating on Iron or Steel Articles
ASTM A242
Standard specification for High-Strength Low-Alloy Structural steel
ASTM A307
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
ASTM A325
Standard Specification for structural bolts, steel, Heat treated 120/105 ksi minimum tensile strength
The first process of Investment Casting production is the manufacture of investment mold, investment mold is used to form the cavity in the refractory shell model, so in order to obtain the casting with high dimensional accuracy and surface finish, the investment mold itself should have high dimensional accuracy and surface finish. In addition, the performance of the melt itself should also make the subsequent shell making process as simple as possible. In order to obtain the above high quality requirements of the investment die, in addition to good pressure (pressing the investment die), but also must choose the appropriate mold material (referred to as the mold) and reasonable mold making process.
The advantage of the investment casting method is that it can cast complex castings of various alloys, especially high temperature alloy castings. For example, the blade of jet engine, its streamlined outer profile and cooling inner cavity, with machining process almost impossible to form. Investment casting process can not only achieve mass production, ensure the consistency of castings, but also avoid the stress concentration of residual blade lines after machining.
The biggest advantage of investment casting is that because investment casting has a very high dimensional accuracy and surface finish, so it can reduce the machining work, just leave a little machining allowance in the parts requiring higher parts, and even some castings only leave grinding and polishing allowance, without mechanical processing can be used. It can be seen that the investment casting method can greatly save machine tools, processing time and metal raw materials.
