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Rebar shop drawings are typically created by specialized drafters or detailing firms based on the structural engineer's design drawings and specifications. They play a crucial role in ensuring the rebar is installed correctly, meeting the project's structural requirements, and adhering to industry standards and codes.
UNDERSTANDING SYMBOLS AND NOTATIONS
Common Symbols
1. Bar Symbols
Straight bars - represented by a simple line with bar size notation.
Bent bars - lines with bends or hooks indicated.
Stirrup/tie bars - often shown with closed shapes like rectangles or circles.
2. Hooks
Indicated with a small semicircle or angle at the end of a bar line.
3. Splices
Shown with overlapping lines and a dimension indicating the lap length.
4. Dowels
Represented by short protruding from the main bar.
Symbols Relating to Cross-Sectional Shape and Size of Reinforcement
1. Φ - plain round bar or diameter of plain round bar.
2. □ - plain square bar or side of plain square bar.
3. # - deformed bar or nominal size of the rebar.
Notations for Bar Size, Spacing, and Placement
1. Bar Size
Indicated by a number corresponding to the bar diameter. Metric sizes are used in many countries, denoted by the bar in millimeters.
2. Spacing
Shown with a dimension line and a number, indicating the center- to- center distance between bars. For example, "150mm. O.C." means bars are spaced in 150 millimeters On Center.
3. Placement
Top and Bottom Bars - indicated by terms like "T" for top and "B" for bottom.
Layers - shown with numbers or letters indicating different layers of rebar.
Location - sometimes given in relation to the structural element.
Abbreviations and Codes
Clearance or Clear (CLR) - refers to the space or distance between reinforcing bars (rebars) themselves, or between rebars and other elements like formwork, inserts, or openings within the concrete structure.
Continuous (CONT) - refer as continuous reinforcements used in non-prepossessed reinforced concrete to improve the load-carrying capability of the structure by providing high tensile strength.
Diagonal (DIAG) - spread the force received by the wall and increase the strength of the wall as well as enhance the stiffness of the structural system at once.
Each face (EF) - refers to the faces of columns, walls, and other structures.
Epoxy (EP) - refer to the type of rebar used in concrete subjected to corrosive conditions; these may include exposure to de-icing salts or marine environments. Epoxy coated rebar is utilized in the following structures: Bridges. Parking structures.
Each way (EW) - means the reinforcing is laid out horizontally in a square grid with the same size bars and spacing in both directions.
Horizontal (H) - refers to reinforcing bars that are placed parallel to the ground or the main horizontal axis of the concrete structure.
Vertical (V) - refers to reinforcing bars (rebars) that are oriented perpendicular to the ground or aligned with the vertical axis of a concrete structure
Inside face (IF) - refers to the interior surface of a concrete element where the reinforcing bars are positioned relative to the concrete formwork or structure.
Outside face (OF) - refer to the surface of the concrete element that is exposed to the exterior environment or the outermost surface of the structure.
Mark (MK) - typically refers to a specific identifier or label assigned to a particular rebar or a set of rebars. This label helps in identifying and referencing the rebar within the construction plans.
Top & Bottom (T&B) - refer to the placement and orientation of reinforcing bars (rebars) within a concrete element, such as a slab, beam, or footing.
Top of footing (TOF) - refers to the upper surface of a concrete footing.
Top of slab (TOS) - refers to the upper surface of a concrete slab. This term is used to indicate where certain elements or actions should be positioned relative to this surface.
Typical (TYP) - signifies that a specific detail or configuration should be applied in all similar situations unless otherwise noted. It simplifies the drawing by reducing the need to repeat the same detail multiple times.
Unless Otherwise Noted (UON) - this phrase means that a given instruction, configuration, or detail should be applied universally across the drawing or project, except where specific notes or details indicate a variation.
Example of Common Notations in Rebar Drawings
# 4 @ 12" o.c. E.W. - #4 rebar spaced 12 inches on center each way.
T/B-#5 @ 18" o.c. - top and bottom layers use #5 rebar spaced 18 inches on center.
4-#6 T - four #6 rebars in the top layer.
8d lap - lap splice is 8 times the diameter of the bar.
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