Product and selection guide
Custom Framed Trench Cover Grating: specification overview
A custom framed trench cover is coordinated from the civil opening outward. The opening size, frame outside size and removable grate size are different dimensions and should each be shown. The drawing also needs the top elevation, bearing seat and the relationship to concrete, paving or floor finish.
Panelization should balance clear support, access and practical handling. Special corners, changes in width, outlets and obstructions are best resolved on a plan with numbered panels rather than by a single overall dimension.
Angle-frame and edge details
Include this detail in your drawing or enquiry for an accurate quotation.
Lifting, hinging or fastening requirements
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Straight, corner and special opening layouts
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Fabrication reviewed against customer drawings
Include this detail in your drawing or enquiry for an accurate quotation.
Framed opening dimension schedule
| Drawing code | Dimension / detail | What to confirm |
|---|---|---|
| A | Clear trench or pit opening | Width × length and site tolerance. |
| B | Clear unsupported span | Distance between effective bearing points. |
| C | Frame outside dimension | Coordination with recess, concrete or floor edge. |
| D | Bearing seat | Width, continuity and permitted gap. |
| E | Finished top level | Flush, recessed or raised relationship to the floor. |
| F | Panel size and joints | Panel numbering, joint position and removal sequence. |
| G | Frame section / anchorage | Section orientation, anchors and embedment detail. |
| H | Access hardware | Lift points, hinges, locks, bolts or clips if required. |
Fabrication details that belong on the drawing
- Bearing-bar direction and supported ends
- Load-carrying band versus trim band
- Corners, mitres, curves, outlets and penetrations
- Hinge axis and opening clearance where hinged access is required
- Lifting method and intended panel handling
- Reference datum and installation tolerance
Before production
A reviewed drawing should identify the frame and grate as matched parts, with panel marks and quantities. Field dimensions are especially important for replacement covers or existing trenches where nominal civil dimensions may differ from the actual opening.
Custom Framed Trench Cover Grating FAQ
Which dimension should I use for quotation?
Provide the clear opening and frame detail as well as any required overall size; do not provide only one undifferentiated length and width.
Can irregular openings be discussed?
Yes. Send a plan, dimensions and photos. Feasibility, joints and fabrication method must be confirmed before quotation.
Why number the panels?
Panel marks connect the fabrication drawing, installation position, packing and future removal sequence.
Technical references
Standards and terminology
- YB/T 4001.1-2019 — length, width, span and banding terminology
- Nucor and Grating Pacific catalogs — common fabrication-detail reference
State the applicable standard, edition and acceptance criteria in your enquiry. The quotation and drawing identify the agreed product configuration.
Order and drawing information
Provide dimensions, load conditions, material, finish, quantity and the applicable standard with your enquiry. The agreed details are recorded in the quotation and production drawing.