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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11Reinforced concrete bridges are built by creating a continuous load path: the ground supports foundations, foundations support piers and abutments, those supports carry the superstructure, and the deck provides the roadway. The exact construction sequence depends on the bridge design, geology, water, access, and contract specifications; there is no single foundation or framing method used on every project.
How the bridge carries loads
Traffic loads reach the deck first. The deck transfers them into the superstructure—the spanning system shown in the plans—which carries them to piers and abutments. Those supports transfer the forces through foundations into the ground. Reinforcing bars help concrete elements resist tension, while concrete provides much of their compressive strength.
FHWA guidance describes reinforced-concrete substructure elements including piles, columns, pier walls, drilled shafts, pile-cap footings, spread footings, and pier caps. A bridge may use cast-in-place concrete formed and reinforced on site, precast components made elsewhere and assembled at the site, or a combination. These are U.S. federal guidance materials; project plans, contract specifications, owner standards, and local conditions govern the actual work.
1. Investigate the site and prepare the ground
Before construction, the project team uses geotechnical and site information to select foundations for the expected loads and ground conditions. Water level, access for equipment, nearby structures, and construction constraints also affect the plan. FHWA’s structural foundations guidance covers several foundation types; it does not prescribe one option for all bridges.
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During construction, inspectors compare the exposed bearing material with the design assumptions, check subgrade preparation and groundwater conditions, and require unsuitable material to be addressed in accordance with the project requirements. The necessary excavation and preparation differ by foundation type and site.
2. Build the foundations
Foundations transfer forces from the bridge supports into soil or rock. Common options include shallow footings, driven piles, drilled shafts, micropiles, and auger-cast piles. The design and site determine which is suitable; none is universally best.
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| Foundation type | How it is built | What distinguishes it |
|---|---|---|
| Shallow or spread footing | Concrete bears on prepared ground. | Used when the design can transfer loads to suitable near-surface material. |
| Driven pile | A pile is driven into the ground. | Installation and acceptance depend on the design, subsurface conditions, and owner requirements. |
| Drilled shaft | A hole is excavated and inspected, a reinforcement cage is installed, and concrete is cast in place. | FHWA’s 2018 drilled-shaft manual reports a typical diameter range of 3 to 12 feet; that range is not a rule for every project. |
| Micropile or auger-cast pile | Installed using the method specified for the selected pile type. | Both are among the foundation types recognized in FHWA’s foundation guidance; project-specific details depend on the design and site. |
For drilled shafts, excavation is followed by inspection of the soil or rock at the bottom and along the hole as required. The reinforcement cage is then placed and concrete is poured in the shaft. FHWA’s Drilled Shafts: Construction Procedures and LRFD Design Methods (FHWA-NHI-18-024) describes the method in detail.
3. Construct footings, pile caps, piers, and abutments
Where the design uses a footing or pile cap, crews position and support the reinforcement as specified and install formwork to shape the concrete. A pile cap connects piles and supports the pier or column above. Piers carry the bridge between its ends; abutments support the superstructure at the ends and meet the approach roadway.
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These elements may be cast in place or assembled from precast components with engineered connections. Precast construction shifts concrete production away from the bridge site, but transport, erection, tolerances, and connections must all suit the design. FHWA’s Underwater Bridge Inspection Reference Manual describes common reinforced-concrete substructure elements and inspection considerations.
When foundations are in water
A cofferdam or another dewatering arrangement can create a dry work area, but temporary works vary with the site and construction plan. At the Providence River Bridge, FHWA documents precast pier boxes placed around drilled shafts to permit footing work in the dry. This is a documented project approach, not a standard method for every bridge.
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See FHWA’s Foundation Connection chapter for that example.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.4. Build the superstructure
The superstructure is the part that spans between piers and abutments and transfers traffic loads to them. Its form—such as a slab or a system of beams or girders—is determined by the bridge design. Reinforced concrete may be cast in place, precast, or used with other materials, depending on the plans. The construction sequence and connections are therefore project-specific rather than a fixed recipe.
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5. Form and place the deck
The deck forms the roadway surface and must meet the planned geometry while being supported safely during placement. Before concrete is placed, inspection checks whether formwork and falsework are adequate and whether the deck will be built to the specified thickness, grade, and crown.
Before the pour
- Check forms and supports, including their strength and expected deflection under construction loads.
- Verify reinforcement position and support, including the specified concrete cover.
- Check expansion devices, joints, and railing anchors embedded in or attached to the deck.
- Confirm slab thickness and roadway grade or crown against the plans.
- Review weather and other placement conditions under the project specifications.
During placement and finishing
Concrete placement, finishing, and surface profile are checked against the plans and specifications. Inspectors also check joints and, where specified, curing-compound application. FHWA’s Concrete Bridge Deck Inspection Checklist identifies these and other deck-specific checks. Any thresholds in a general checklist must be checked against the applicable project specification rather than treated as universal requirements.
6. Cure, inspect, and complete the bridge
After placement and finishing, concrete develops its properties through hydration. FHWA’s Long-Term Bridge Performance protocol explains that curing maintains suitable moisture and temperature during hydration. The required curing method and duration are determined by the concrete and project specifications, not by one universal timetable.
Construction oversight includes concrete testing and records, placement and finishing checks, and verification of curing. Final inspections can include grades, surface condition, drainage, railings, and expansion plates. The bridge is accepted and opened according to the project’s specified tests and criteria; there is no single opening-to-traffic time that applies to all concrete bridges.
For further detail, consult FHWA’s Bridge Construction Records protocol and construction inspection guide.
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