Welded I-girder segments with coordinated camber, bearing details and field splices
We fabricate welded steel I-girder segments from the released bridge drawings. Web and flange plates, bearing stiffeners and connection pieces retain their individual material identities through assembly. Shop work, field-splice interfaces and matching loose pieces are listed against each shipping-segment mark.
| Girder section | Web depth/thickness and separate upper/lower flange dimensions |
|---|---|
| Alignment | Straight, curved or other issued geometry identified on the member detail |
| Camber | Specified ordinates, reference condition and measurement datums |
| Attached plates | Bearing stiffeners, connection plates and other scheduled details |
| Splices | Shop plate splices and field assembly joints distinguished |
| Finish | Girder, joint surfaces and permitted repair scope identified separately |
| Shipment | Segment length, handling envelope and loose connection parts |
Plate thickness changes the mass allowance for webs, flanges and stiffeners. The values below give mass per square meter of flat steel before holes, weld metal, coatings or cutting loss.
| Plate thickness (mm) | Theoretical steel mass (kg/m²) |
|---|---|
| 6 | 47.10 |
| 8 | 62.80 |
| 10 | 78.50 |
| 12 | 94.20 |
| 16 | 125.60 |
| 20 | 157.00 |
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Derived plate takeoff reference: mass/area = thickness in meters × 7,850 kg/m³ steel density. The released girder BOM supplies the actual plate dimensions and materials. Girder unit mass, shipping gross mass and structural design use their respective assembly, packing and design bases.
The project material callout remains with the web, flanges and stiffeners, including specified toughness requirements. Each ASTM A572 or A709 designation retains its own material and acceptance requirements on the girder schedule.
Web-to-flange welds, plate butt splices and attachment welds have different locations and examination requirements. The joint schedule identifies the governing welding specification and required procedure or qualification records.
We supply China-origin fabricated components for projects that accept that source. Required fabricator qualifications, origin provisions and project approvals are identified with the purchaser before order acceptance.
The released detail fixes the plate-splice locations and their relationship to stiffeners, holes and attachments. Moving a splice to use a convenient plate length changes the fabricated member and needs acceptance before production.
The camber diagram identifies reference points and the member condition used for measurement. Shop support positions and self-weight can affect the measured shape; the record keeps those conditions with the ordinates.
Bearing contact, flange clearance and cross-frame attachments use their own fit details. Stiffener ends and weld access are prepared to preserve the specified bearing surfaces, clearances and attachment locations.
Web and flange splice interfaces retain the released hole pattern and matched-piece identity. Shop preassembly or other fit-up checks are included where the order requires them, with the inspected condition recorded.
Member and shipping-piece marks connect the fabrication drawings to the erection sequence. Cross-frames, bearings and deck attachments have their own interface references within that girder line.
The retained steel geometry and approved repair design govern replacement ends and splice arrangements. Surveyed dimensions are distinguished from nominal historical drawings where the project requires a site fit.
Coordinate the full bridge steelwork package
Checks cover flange position, web alignment, member length and the required camber condition. The dimensional record relates the actual measured locations to the drawing datums.
Material identity follows the plate items into the assembly. Required weld-examination records identify the actual joint, inspection method and acceptance criteria.
Splice holes, bearing contact and attached connection pieces are checked before finish or dispatch as required by the inspection plan. Any accepted deviation retains its affected member and revision.
Our offer separates fabricated girder segments, loose joint items, required shop assembly checks and protection scope. The price basis states whether it uses finished member mass or another agreed measure.
Dunnage and restraints support the segment at the agreed locations. Flange projections, connection plates and prepared joint faces are protected from concentrated packing contact.
The shipping list retains member orientation, piece marks, mass and loose splice-item counts. A revised transport break is carried into the segment drawing and receiving register.
The accepted splice design and transport plan establish each break. Its joint and fabrication details are carried into the shipping-segment drawing and loose splice-item schedule.
The drawing and inspection plan state the supports, girder orientation and reference points. Camber is recorded under that condition so its self-weight and support basis matches the required geometry.
Studs and attachment work are included as listed offer items. The girder/deck interface schedule identifies stud type, positions, welding responsibility and any site-installed items.
The project protection detail identifies painted and exposed zones, including bearings, joints and drainage-sensitive areas. Those requirements define the surface-treatment scope for the selected weathering-steel grade.
A proposed plate change is submitted for material and detail acceptance. The review covers member mass, geometry, welds and connection clearances before the revised plate enters fabrication.
The offer identifies shop-fabricated steel and the specifically listed services. Site erection, temporary restraints and lifting engineering remain separate unless expressly included in the contract.
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Send the girder drawings and BOM with camber data, splice and bearing details, material/test requirements and proposed shipping breaks. Include quantities, finish, accepted origin and destination for an itemized fabrication offer.