Trestles, longitudinal frames and connection steel for conveyor OEMs
We fabricate conveyor support steel from the equipment interface and approved structural drawings. Trestles, crossframes, longitudinal members and bracing retain the conveyor centerline, support elevations and mounting references. The package covers the steelwork and listed connections; belts, idlers, drives and transfer equipment remain separate equipment items.
| Primary assemblies | Trestles, crossframes and longitudinal support members |
|---|---|
| Stability steel | Braces, gussets and connection members |
| Equipment interfaces | OEM support positions, reactions and mounting details |
| Base interface | Approved foundation elevations and anchor layout |
| Access coordination | Equipment maintenance and any separately ordered walkway |
| Protection | Specified painted or galvanized finish |
| Field hardware | Listed structural bolt assemblies and connection plates |
| Excluded equipment | Conveyor belt, idlers, drive, take-up and process machinery unless named separately |
Approved conveyor-steel joints retain their bolt size and hole type. A round structural bolt hole is larger than the nominal bolt diameter; oversize and slotted holes are separate connection details.
| Bolt diameter (in.) | Standard hole (in.) | Hole equivalent (mm) |
|---|---|---|
| 1/2 | 9/16 | 14.29 |
| 5/8 | 11/16 | 17.46 |
| 3/4 | 13/16 | 20.64 |
| 7/8 | 15/16 | 23.81 |
| 1 | 1 1/8 | 28.58 |
| 1 1/8 | 1 1/4 | 31.75 |
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RCSC Specification for Structural Joints Using High-Strength Bolts, June 11, 2020, Table 3.1: selected nominal standard round-hole dimensions. Millimeters converted from inch fractions. Frame sizing and connection approval come from the released joint design, which controls hole type, edge distances, fasteners and installation.
The equipment design identifies the applicable belt and material loads, starting or braking reactions and any maintenance cases. The reaction schedule for the supports comes from that equipment design.
Dynamic effects, wind and other site actions are part of the structural design basis where applicable. The fabricated frame follows that design, not an assumed static load per trestle.
Member grades, plate details and bolt assemblies stay on the approved steel drawings. The required hole and installation arrangement is assessed for the actual joint, including any cyclic duty.
Mounting plates retain the OEM hole pattern, seating surface and longitudinal station. Adjustable equipment connections use only the slots or adjustment range shown in their approved detail.
Transfer chutes, drives and take-up assemblies can apply different reactions from ordinary carrying sections. Their interfaces are identified individually instead of being repeated from the standard trestle.
Diagonal members must coexist with the planned belt, idler and equipment removal paths. The accepted layout reserves that access before braces and secondary members are fabricated.
A transport break uses a released structural splice with its plates and fasteners. Splice positions and temporary erection requirements stay as released.
The steel schedule follows support stations and elevation changes along the route. Piece marks connect crossframes, longitudinal members and their field joints to the same installation area.
An extension needs the new support geometry and the interface to retained equipment or steel. Replacement work retains measured mounting conditions and an accepted removal and support sequence.
Support marks, longitudinal stations and mounting elevations are checked against the released datum. Slope and handed connections stay identifiable through finish and packing.
Equipment hole grids and field-joint holes use their stated datums and hole types. The joint arrangement is checked against those datums.
The inspection plan assigns weld examination and coating checks to the required joints and surfaces. Bolts, nuts and washers follow their assembly schedule, grade and finish.
Shipping groups follow the conveyor route and assembly marks. Connection plates and hardware remain tied to the members they join.
Dunnage and restraints support the steel without damaging machined or finished mating surfaces. Projecting brackets are protected against handling contact.
We itemize frames, attached plates, bracing, finish and included field hardware. Access additions and equipment items use separate scope, with packed size and destination reflected in shipment terms.
The revised interface is checked against the affected fabricated plates and members before production continues on those marks. The accepted change identifies which pieces remain usable and which need revised work; new drawings and packing references must describe the same revision.
No. Span and member selection depend on equipment reactions, structural arrangement, serviceability and site actions. Belt width alone does not define a frame load rating.
A changed hole type can affect the connection and adjustment behavior. Field alterations require the accepted engineering detail; a longer slot is not simply an enlarged clearance hole.
Its brackets, people loads and clearances need to be included in the design. A later access addition may affect members, bracing or foundations and should not be assumed to fit an already released frame.
The erection plan assigns temporary support and bracing responsibilities. A stable completed structure may pass through unstable partial stages, so the final-frame drawing alone is not the entire erection method.
Yes. The order separates the complete replacement assemblies from spare plates and their fasteners. Each spare retains the intended joint and drawing reference so it can be identified without reconstructing its location from the main steel weight.
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Send the route and equipment interface drawings, reactions and released steel package with quantities, finish and destination. Identify walkways and transfer-support additions for an itemized offer.