Basic approach
Module(s): BAMTEC
To define the carpet outline
The first step involves defining the carpet outline, that is, its outer dimensions. When making definitions, please bear in mind that the number of carpets should be kept to a minimum.
Basic rules applying to lap joints:
- Joint of the top layer in the span regions.
- Joint of the bottom layer above the load-bearing columns and walls.
- Overlap length that reflects common practice and usage.
If possible, you should always use the same bearing length so that the carpets can easily be placed on the building site. As a rule, a value of 15 cm is sufficient for slabs in normal residential buildings. The distance of the first bar parallel to the wall should not exceed 10 cm. The offset from the edge to recesses and openings should not exceed 5 cm. if necessary, additional reinforcing bars need to be placed in the placing drawing.
Carpet sizes are limited by maximum weight and maximum size considerations. If possible, rectangular outlines should always be used. To facilitate easy handling, the weight should be distributed evenly across the carpet.
- A carpet of the bottom layer should not weigh more than 1500 kg overall and the weight of the carpets of the top layer is limited to 1,000 kg. A further criterion to bear in mind is the site crane's lifting capacity.
Keeping to the maximum weight ensures that the carpets can be rolled out by two or three site workers - For production reasons, the maximum width of a carpet i.e. the width of the roll must not exceed 15 m. It is advisable to specify a width of up to 12 m.
The maximum length of a carpet should not exceed 20 m to ensure that the carpet can easily be unrolled on the building site. - When defining the shape and unroll direction of a carpet, it is important to ensure that the carpet can easily be unrolled on the building site. The carpet should not get wider as it unrolls. If possible, the width should be constant or get smaller. It is also necessary to ensure that no reinforcement is generated that can only be welded to a single lifting strap.
- Reinforcing bars in the areas of supports may extend into the slab by approximately 15 cm. In the case of reinforced concrete walls or edge beams, the load-bearing bars must end at the interior edge of the wall. Support anchorage is achieved using additional, local U-shaped links (50% of the As of the span reinforcement).
- The alternatives presented for assigning carpet labels must be adhered to. Proper labeling is necessary for the automatic analysis of the carpet labels in the subsequent steps.
Separate and reinforce
In the next step, all the carpets are separated (copied) onto one drawing file each and fully- or semi-automatically reinforced.
By definition, all the bars in one drawing file represent one carpet. If necessary, you can thus insert additional reinforcement.
The results are checked and, if necessary, manually altered.
Plans, schedules and files
The placing drawings and general drawings for the checking structural engineer are printed together with all the assembly drawings.
- For the building site, placing drawings are generated separately for the bottom and top layer, indicating how the carpets are to be placed and rolled out. Lap joints are displayed and the carpets are included.
In addition, the drawings provide information on the additional reinforcement required for beams, connections for reinforced concrete walls and columns, stirrups etc. In the interests of clarity, it may be necessary to display the additional reinforcement in a separate drawing. - For the actual production of the carpet, one assembly drawing is generated per carpet. In order to achieve a uniform appearance, rotate the drawing files as necessary when assembling the layout.
The assembly drawings should include the following information:- Name of the BAMTEC® file
- Bending schedule
- Definition point of the carpet
- Labels including the names of the project and, if necessary, of the fileset and document
- For the checking structural engineer and for verification purposes, separate general drawings are generated for each reinforcement direction and layer. These drawings contain all the carpet drawing files. As the mounting strips are on the BA_B_TRG layer and the layout elements on the BA_B_PLA layer, you can configure the program to hide these layers. These drawings show the placed reinforcement for the entire component.
To check the carpet reinforcement, you can display the reinforcement contours obtained from the structural calculations. To do this, set the increment between contours according to the basic reinforcement.
Reinforcement schedules can be generated automatically.
The carpet files are created and transferred to the carpet manufacturer.
