A portal type transmission tower is a power line support structure with two main side frames and a crossbeam. It is used where the line needs a wide opening, clear conductor arrangement, or special crossing layout. The tower can support conductors, ground wires, insulators, and fittings while keeping the required safety distance. It is often selected for substations, line entry areas, crossings, and places where a normal lattice tower is not convenient.
Product Parameters
|
Parameter |
Description |
|
Material |
Structural steel made according to approved drawings |
|
Surface |
Hot-dip galvanized coating for corrosion resistance |
|
Structure |
Two side frames with crossbeam and bracing members |
|
Connection |
Bolted or welded parts based on design requirement |
|
Application |
Substation entry, line crossing, and special power line support |
|
Packing |
Steel members packed by frame section and mark number |
Components
The main parts include side columns, crossbeam, diagonal braces, base plates, ladder or step bolts, insulator support points, and grounding parts. The crossbeam size is confirmed by conductor spacing and line clearance.
Product Advantages
The portal type transmission tower provides a clear opening between two side frames, so conductors can enter a substation or cross above equipment without placing a central tower leg in the route. Crossbeam length and insulator support points can be arranged for several conductor positions while maintaining the required phase spacing. Loads are transferred through both columns to separate foundations, and the frame can be divided into marked sections for transport and site assembly.
Use Notes
Before approving a portal type transmission tower, confirm the clear width and height under the crossbeam, conductor spacing, line-entry angle, insulator points, foundation center distance, grounding layout, and crane access. Column-to-crossbeam connections should be checked against the latest drawing before galvanizing. On site, assemble both side frames to the correct center distance before lifting the crossbeam.
FAQ
Q: When should this structure be used?
A: It is used when a wide opening, special line entry, or clear crossing space is needed. This helps the portal type transmission tower arrive with fewer mixed parts.
Q: Can the crossbeam length be customized?
A: Yes. It is made according to conductor spacing, voltage level, and site clearance.
Q: How are the parts marked?
A: Each member can be marked by section number, drawing number, and packing list for field assembly.
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