It is Thursday afternoon and the ground slab is due on site next Monday. The site foreman asks which sheet shows the pit edges, and the desk has two drawings open and no clear answer.
A Schalplan (formwork drawing) and a Bewehrungsplan (reinforcement drawing) come from the same building, but they answer different questions. A Schalplan shows the shape of the concrete; a Bewehrungsplan shows where the steel sits inside it. The site crew reads the Schalplan first for the shape and the level, then the Bewehrungsplan for the bars placed in the same zone.
The crew reads these sheets at the point of work. If a level on the Schalplan differs from the level in a section on the Bewehrungsplan, the work stops and someone calls the office. One consistent pair of sheets removes a common reason for that call.
Which drawing answers which question?
The Schalplan covers plans, sections and details for slabs, walls, columns and beams. It is coordinated with the architectural model, so openings, levels and edges line up with the building.
The Bewehrungsplan covers rebar layouts, sections and schedules. Its bar positions come from the structural calculations. The Stahlliste (bar schedule) lists each bar with its bending shape and length.
On a Bodenplatte (ground slab), the split is easy to see. The formwork sheet fixes the pit outline and its levels. The reinforcement sheet fixes the bars that run around that outline.
The Schalplan tells the crew where the concrete stops. The Bewehrungsplan tells them where the steel goes.
That is why the two sheets must be read together. A moved pit changes both sheets.
How one pit edge moves from Schalplan to Bewehrungsplan
Take a lift pit in the ground slab. These six steps leave a trail on both sheets.
- Mark the pit outline and its level on the Schalplan, using the architectural model as the reference.
- Cut a section through the pit edge and dimension the concrete step and the slab edge.
- Confirm the edge zone against the structural calculations with your engineers.
- Draw the edge bars on the Bewehrungsplan, with a section cut at the same location.
- Add each bar to the Stahlliste with its bending shape and length.
- Send both sheets together for checking before release.
The section through the pit edge is the most useful view. It shows the slab thickness, the depth of the step and the distance from the slab edge to the pit wall. The bar sheet needs exactly these dimensions to place the edge bars.
If the pit moves, both sheets change. A new outline means new bar positions and a new count in the schedule.
What to check before either drawing is released
A release check does not need to be long. It needs to be the same on every set. Run these five points on each sheet pair:
- Section marks match on both sheets
- Levels agree with the architectural model
- Bar positions match the structural calculations
- Stahlliste counts match the bars drawn
- Title block and office drawing standards are applied
Release stays with your engineers. The same oceanBIM engineers draw, check and answer your questions. Interim sets are reviewed in a cloud workspace, and final sets are delivered as PDF and DWG.
Send the next set with its calculations attached
The one thing to do next: when you brief a drafter, send the architectural plans, the structural calculations and your office drawing standards together. Those three files let a drafting team quote a fixed scope and start on the right sheet. oceanBIM works as an extension of your office: you keep the engineering, and we produce the drawings on your title block.
Send plans for an offer at https://oceanbim.com/contact-oceanbim/.