Columns and crossmembers with coordinated attachment points, bases and field joints
We fabricate substation gantry steel from the utility’s released arrangement and connection drawings. Columns, crossmembers, bracing and attachment plates are grouped by structure mark, with base and conductor-attachment datums carried into the shop details. The supplied package is the identified steelwork and hardware, separate from electrical apparatus and foundations.
| Columns | Section, base plane, connection ends and attachment elevations |
|---|---|
| Crossmembers | Span geometry, conductor attachment points and field splices |
| Bracing | Member marks, end connections and structure orientation |
| Base plates | Anchor pattern, plate orientation and leveling/bearing detail |
| Attached steel | Insulator or other scheduled mounting plates and brackets |
| Loose hardware | Specified field bolts and separate anchor/mounting hardware scope |
A gantry can combine structural shapes, plate and tube. ASTM A123 coating requirements distinguish material category as well as measured steel thickness.
| Measured steel thickness (mm) | Material category | Minimum average coating reference (µm) |
|---|---|---|
| 8 | Structural shapes | 100 |
| 8 | Plate | 75 |
| 8 | Pipe and tubing | 75 |
| 20 | Structural shapes | 100 |
| 20 | Plate | 100 |
| 20 | Pipe and tubing | 75 |
No matching specification. Clear the search to see every row.
Scroll sideways to see every column.
ASTM A123 material-category reference at the selected measured steel thicknesses, cross-checked with American Galvanizers Association guidance. Each supplied component uses its applicable category and thickness; separate hardware follows its own finish specification. Project exposure and the protection system govern the service-life assessment.
Conductor and equipment loads are referenced to their actual attachment coordinates. Their direction, eccentricity and governing condition stay with the structural design instead of being reduced to a single unspecified frame load.
Anchor centers, plate orientation and finished support level define the steel-to-foundation interface. The selected base arrangement identifies grout, leveling and anchor-hardware requirements.
The supplied steelwork and listed hardware form an identified package. Insulators, conductors, earthing arrangements and electrical apparatus have their own design, purchase and installation scopes.
Attachment plates are located from the structure datums and their required fixing planes. Plate thickness and stand-off can place the final attachment away from a crossmember centerline, which is retained in the shop dimensions.
Crossmember and column breaks follow the released structural connection. The shipping assembly retains orientation, mating flange or plate marks and the field bolt groups for that joint.
Hollow members and closed details need suitable access for the galvanizing route. The accepted vent and drain locations remain part of the fabrication drawing and are coordinated with caps, bases and attachment plates.
Required steel lugs and drilled fixing points are itemized from the utility detail. Adding an attachment after finish changes both the local steel detail and its protection, so it remains a controlled scope item.
Each gantry mark connects columns, crossmembers and bracing to its foundation and attachment arrangement. Similar-looking structures with different conductor points retain separate marks.
The retained structure, field survey and accepted extension design establish the new pieces and their connection geometry. The fabrication details carry those mating interfaces into the extension package.
Checks locate attachment holes and bearing faces from the released structure axes. End-plate orientation and assembled dimensions are checked in the stated shop arrangement.
The inspection plan covers required vent/drain details, welds and protection. Finished holes and joint contact surfaces remain accessible for the intended fastening set.
Material and inspection records follow the gantry marks. Anchor rods, field bolts and apparatus mounting bolts remain separate groups with their own included quantities.
Our quotation lists gantry members, attached plates and field hardware. Foundations, electrical apparatus, insulators and any separate anchor-rod supply are identified independently.
Crossmembers and columns are restrained on suitable dunnage with protection around mounting plates and galvanized faces. Loose braces and hardware travel in linked receiving groups.
The packing register reconciles shipping pieces and boxed connection sets to the structure mark. Special attachment revisions stay distinguishable from repeated standard details.
The released utility arrangement and structural details identify attachment geometry, reactions, clearances, foundations and environmental actions. They define the steel package associated with the project’s voltage class.
They are separate items unless the offer explicitly includes them. The mounting plate drawing identifies the interface, while the insulator has its own electrical and mechanical specification.
An accepted hole revision includes its base-connection design and local protection-repair detail. Those requirements establish the permitted work and its final acceptance.
ASTM A123 uses material category and measured steel thickness to determine the applicable requirement. Plate, structural shapes and pipe/tube retain their respective categories; hardware follows its specified finish standard.
The attachment route must match the accepted structural detail. A loose bolted bracket and a welded plate have different connections and hardware; the quotation identifies whichever assembly is released.
The offer lists any steel grounding lugs or attachment points in the fabricated package. Conductors, clamps, bonding arrangements and installation are separate electrical-design and purchase items.
Other items in the same product category.
We wrote these for buyers specifying and receiving exactly this kind of package.
Send the gantry arrangement, member BOM, attachment and base details with quantities, material, finish and destination. Include the required utility records and hardware boundary for a structure-by-structure fabrication offer.