Bridge Bearing Quotation Checklist: Loads, Movements, Drawings and Supply Scope

Start with a project brief, not a product name

A useful bridge-bearing quotation begins with the structural task that the support must perform. Product names can help begin a conversation, but they do not explain which actions are present, which movement directions must remain available, where rotation occurs, or how the bearing connects to the structure. A request that only says “quote for bridge bearings” or gives a vertical load leaves the supplier unable to compare the same technical basis with another offer. The first objective is therefore not to choose a family from a catalogue. It is to create a concise project brief that makes the bearing schedule, support geometry and procurement boundary understandable.

The brief can be incomplete. Early-stage projects often do not yet have every reaction, drawing or owner requirement. The important practice is to distinguish confirmed data from preliminary data and to identify the unknowns. A current bearing layout, reaction table, support detail or even a marked-up sketch can be more useful than a list of assumed numbers. It allows the review to focus on what must still be clarified before drawings, documents and commercial scope are compared. Final selection remains subject to the responsible project team’s design basis, drawings and approvals.

Describe actions as an envelope

Vertical action is commonly the first figure supplied, but it is only one part of the request. The inquiry should state the action basis and the relevant design situations. Depending on the project, the technical team may need service and ultimate combinations, horizontal actions in each direction, minimum reactions, uplift, braking, wind, seismic, settlement or construction-stage conditions. The goal is not to make an RFQ into a calculation report. The goal is to identify the action envelope that the project expects the bearing and its interfaces to accommodate.

Units and terminology matter. State whether a value is a reaction, an applied action or a preliminary estimate; identify the unit system; and indicate whether values are associated with a particular load combination. If the project uses a bearing schedule, keep its position references and axis convention with the action table. A supplier should not need to infer which pier, abutment or line the values belong to. Where an uplift condition, unusually high horizontal action or special restraint applies, flag it directly. These are review triggers, not items to hide inside a generic note.

For a related project route, review Elastomeric Bearings or Pot Bearings or Spherical Bearings in the context of Highway Bridges.

Treat movement and rotation as separate inputs

Movement should be described by direction, range and state. The project may have longitudinal translation, transverse translation, movement reversals, temperature-related movement, creep or shrinkage effects, staged construction effects or a combination of these. State the project’s local axes and identify the bearing position so that a movement direction can be read from the drawing. A phrase such as “movement allowed” is too broad when the configuration needs a guided direction, a travel allowance or a relationship to an expansion joint.

Rotation is a different question. It refers to the angular relationship that the support must accommodate and should be described about the relevant axis or axes. It may occur with vertical and horizontal actions or while translation is also required. A bearing family may be capable of being configured around these questions, but the family name does not answer them automatically. The inquiry should show whether the provided values are expected to occur at the same time and whether they relate to a particular service or exceptional condition. This clarity protects the project from comparing offers built on unlike assumptions.

Read fixed, guided and free as functions in a larger layout

Fixed, guided and free are functional words. They describe what the project intends to restrain or permit at a support location, but their meaning depends on the structural layout and local axes. A fixed location should be accompanied by the expected horizontal-action path and the position of the fixed point in the wider bridge. A guided location should state the permitted translation direction and the restrained direction. A free-sliding location still needs a movement envelope, available travel, interface condition and protection context.

The bearing itself may not be the only component that carries restraint. A key, pin, connection plate, guide or structural detail can be part of the path. Make that boundary visible in the inquiry. The supplier needs to know whether those components are within the proposed supply scope, are already designed by another party or need coordination with the support drawing. This is especially important on curved, skewed, staged or replacement projects, where a simple verbal direction can be misread. Include a plan or elevation with bearing identifiers, arrows and an axis legend whenever available.

Send drawings that show the real interfaces

A bearing package must meet the support interfaces as well as the action schedule. The most useful drawing set shows the top and bottom connection context, available footprint and height, elevations, anchor or hole concepts, edge distances, clearances, adjacent reinforcement or diaphragms, surface condition and installation datum. If a connection plate, sole plate, anchor assembly, guide or sliding component is expected, identify whether it is part of the RFQ or a separate project item. A photograph can help with an existing condition, but it should be paired with dimensions and drawing references where possible.

For replacement work, add the existing bearing identifier, measured dimensions, accessible jacking space, condition photographs, work-window constraints and the current support geometry. Those facts do not prescribe a lifting or replacement method. They allow the project team to identify what must be resolved by the responsible engineer, contractor and supplier before a manufacturing detail is released. If a drawing is preliminary, label it as preliminary rather than leaving its status uncertain. A quotation can then set out the assumptions that need confirmation before production.

Make the supply scope comparable

Two quotations can both use the word “bearing” while referring to different supply boundaries. One may include an assembly only; another may include upper or lower plates, anchorage components, sliding or guide elements, protection, marking, inspection records, drawings, packing or export documents. Price comparison without a scope table can therefore create a false economy. The RFQ should ask the supplier to state what is included, what is excluded and which items depend on the approved configuration.

Quality and document requirements belong in the same scope conversation. State whether the project requests material records, dimensional inspection, coating checks, testing, witness points, drawings, schedule marking, packing lists, certificates or other controlled documents. Do not assume that a generic data sheet has the same role as a drawing, inspection record or project-specific calculation. Each document should have a clear purpose, family/configuration applicability, revision status and expected delivery point. This is particularly valuable for export projects where the purchaser, consultant, inspection party and site team may each rely on a different part of the handover package.

Use the quotation comparison as a design-control step

Before deciding between offers, align the inputs that produced them. Confirm that each supplier has used the same action envelope, movement and rotation basis, fixed/guided/free function, support geometry, interface responsibility, exposure requirements, inspection scope, documents, quantity and delivery basis. If one quotation is built on preliminary data, it should say so plainly. If one includes a connection plate or guide and another excludes it, compare the difference as scope, not merely price.

This comparison does not transfer design responsibility to the supplier or the purchaser. It helps the project team detect unanswered questions early. A well-organised quotation package can support the next stage: clarifying assumptions, reviewing drawings, confirming documents and releasing a defined manufacturing scope. The most productive RFQ is therefore not the longest form. It is the one that connects current project evidence to the questions that genuinely govern a bearing arrangement.

A short submission checklist

Before sending an inquiry, collect the current bearing schedule or support layout; actions and load basis; translations and rotations by axis; fixed, guided or free function; top and bottom support details; applicable standard or project specification; exposure and required protection; quantity and programme; and the requested inspection/document package. Add any special conditions such as uplift, temporary restraint, jacking, replacement access, unusual delivery sequence or unresolved design item.

Then make the unknowns explicit. A request can still be valuable when some data is pending, as long as it does not present a placeholder as confirmed design input. Upload the files that establish the existing picture and explain which decisions need project review. That approach gives the quotation process a sound technical starting point while preserving the project-specific verification and approval route that final bearing selection requires.