ISO 3766:2003

INTERNATIONAL ISO
STANDARD 3766
Third edition
2003-12-15


Construction drawings — Simplified
representation of concrete reinforcement
Dessins de construction — Représentation simplifiée des armatures de
béton




Reference number
ISO 3766:2003(E)
©
ISO 2003

---------------------- Page: 1 ----------------------
ISO 3766:2003(E)
PDF disclaimer
This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but
shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In
downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat
accepts no liability in this area.
Adobe is a trademark of Adobe Systems Incorporated.
Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation
parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In
the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below.


©  ISO 2003
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56 • CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland

ii © ISO 2003 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 3766:2003(E)
Contents Page
Foreword. iv
1 Scope. 1
2 Normative references. 1
3 Requirements to reinforcement construction drawings. 1
4 Placement information and representation. 2
4.1 Reinforcement without prestressing . 2
4.2 Prestressed reinforcement. 7
5 Marking. 8
6 Bending information for unprestressed reinforcement bars . 8
6.1 General. 8
6.2 Indication of bar shapes. 9
6.3 Coding system (optional). 11
7 Bar schedule. 17
7.1 General. 17
7.2 Shape schedule. 17
7.3 Bending schedule. 17
7.4 Combined schedules. 18
7.5 Title block. 18
Annex A (informative) Mat schedule — Example . 21

© ISO 2003 – All rights reserved iii

---------------------- Page: 3 ----------------------
ISO 3766:2003(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 3766 was prepared by Technical Committee ISO/TC 10, Technical product documentation,
Subcommittee SC 8, Construction documentation.
This third edition cancels and replaces the second edition (ISO 3766:1995) and ISO 4066:1994, which have
been technically revised.

iv © ISO 2003 – All rights reserved

---------------------- Page: 4 ----------------------
INTERNATIONAL STANDARD ISO 3766:2003(E)

Construction drawings — Simplified representation of concrete
reinforcement
1 Scope
This International Standard specifies the simplified representation and the characterization of reinforcement in
reinforced and in prestressed concrete for use in construction drawings. It also establishes a system for the
scheduling of reinforced bars, comprising
 a method for specifying dimensions,
 a coding system for bar shapes,
 a schedule of preferred shapes, and
 a shape schedule and bending schedule.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced
document (including any amendments) applies.
ISO 128-23:1999, Technical drawings — General principles of presentation — Part 23: Lines on construction
drawings
ISO 10209-4:1999, Technical product documentation — Vocabulary — Part 4: Terms relating to construction
documentation
3 Requirements to reinforcement construction drawings
The construction parts shall be provided with the main dimensions, the concrete reinforcement shall be drawn
and all parts shall be represented unambiguously and clearly in scaled plans, elevations and sections. The
representations shall correspond with the indications in the structural calculations and should, where
applicable, contain all dimensions required for the construction of the members and the verification of the
calculations.
Drawings used for off-site casting and factory production are excepted from this provision.
Reference shall be referred to accessory drawings. For drawings modified later, all concerned drawings shall
be modified as well.
The following characterizations (general information and placement information) of the reinforcement bars
shall be given on the drawing:
 required concrete strength class, the exposure class and further requirements to the concrete given in
reference standards;
© ISO 2003 – All rights reserved 1

---------------------- Page: 5 ----------------------
ISO 3766:2003(E)
 type of reinforcing steel and prestressed steel given in reference standards;
 bar mark, number, diameter, shape and position of the reinforcement bars; distance between the bars
and overlap length at joints; arrangement, dimensions and development of welding points by specification
of the joining metal, jarring plates, position of the concreting gap;
 type of the prestressing system; number, type and position of the tendons; number, type and position of
the tendon anchoring and tendon coupling; bar mark, number, diameter, shape and position of the
accessory not prestressed concrete reinforcement; type and diameter of the encasing tubes; specification
of the intrusion grout;
 measures for securing the position of the concrete reinforcement and the tendons (e.g. kind and
arrangement of the bar chairs, as well as arrangement, dimensions and shape for the support of the
upper concrete reinforcement layer and the tendons);
 the layer dimension c which derives from the nominal dimension c of the concrete cover, as well as
V nom
the allowance in design for tolerance ∆c of the concrete cover;
 the joint development;
 special measures for quality assurance, if required.
The following information on bending the reinforcement bars shall be given on the drawing or on separate
documents such as a bar schedule:
 if the shape coding system according to 6.3 is applied, bending shapes of the reinforcement bars shall
refer unambiguously to the shape numbers, hence the graphical representation may be unscaled;
 single length, sectional lengths and, if applicable, bending angles of the reinforcement bars shall be
indicated (for typifying bending shapes, Table 5 shall be taken into account, and in every case the
reference standard mandrel or radii shall be represented on the drawing);
 the mandrel diameters or radii.
Manufacturing tolerances shall be taken into account in dimensioning the reinforcement components, in order
to reach the desired concrete cover in the ready-made structure.
4 Placement information and representation
4.1 Reinforcement without prestressing
The representation and drawing conventions of concrete reinforcements without prestressing shall be in
accordance with Table 1.
2 © ISO 2003 – All rights reserved

---------------------- Page: 6 ----------------------
ISO 3766:2003(E)
Table 1 — Representation and drawing conventions of concrete reinforcements without prestressing
No. Description Representation
Views
1
a) General representation of bar by a

continuous extra-wide line
b) Bent reinforcement bar
1) representation as a polygonal

continuous line or

2) representation as a continuous
line made up of straight lines and

arcs
c) Bundle of bars drawn using a single
line, with end markings indicating

number of bars in bundle
EXAMPLE Bundle of three identical bars.
Section of bar
2
a) section of single reinforcement bar

b) bundle of two reinforcement bars

c) bundle of three reinforcement bars


3 Bar with hook anchoring
a) elevation of bar terminating in a 90°

bend

b) elevation of bar terminating in a bend

between 90° and 180°

c) elevation of bar terminating in a 180°

bend

4 Straight bars lying in a row or a plane to
indicate the ends of the bars, showing

corresponding bar marks using narrow line
5 End anchorage with plates
a) elevation or plan view

b) section or end view

6 Bar bent at a right angle away from viewer

7 Bar bent at a right angle towards viewer

8 Overlapping stack of reinforcement bars

a) without marking bar ends by a slash
and bar marks


b) with marking bar ends by a slash and
bar marks


© ISO 2003 – All rights reserved 3

---------------------- Page: 7 ----------------------
ISO 3766:2003(E)
Table 1 (continued)
No. Description Representation
Bars joined by mechanical couplers —
9
general representation
a) tension coupler

b) compression coupler

10 Welded fabric, top view (If required, an
oblique stroke crossing the diagonal line
may be used to indicate the direction of the
main reinforcement, as shown here.)

11 Welded fabric, identical sheets in a row
a) with representation of single sheets

b) condensed representation

Overlapping length shall be given on the
drawing
12 Top view of layer containing identical
sheets
a) with representation of single sheets

4 © ISO 2003 – All rights reserved

---------------------- Page: 8 ----------------------
ISO 3766:2003(E)
Table 1 (continued)
No. Description Representation
b) condensed representation with
indication of overlapping
Overlapping length shall be given on the
drawing
13 Welded fabric, section
a) simplified representation by a long

dashed dotted extra-wide line
b) conventional representation

14 Set of identical bars
a) each set of identical bars indicated by
one scaled-drawn reinforcement bar
and a line terminated by oblique lines
to mark extreme bars (circle connects

“set line” with correct bar)
b) identical bars placed in groups.

15 Bars with a specification of the diameter or
radius of mandrel, if differing from the
minimum diameter or radius of the mandrel

NOTE A radius is indicated by the additional
letter R.

© ISO 2003 – All rights reserved 5

---------------------- Page: 9 ----------------------
ISO 3766:2003(E)
Table 1 (continued)
No. Description Representation
Location of layers of reinforcement on
16
plan drawings
where
B is the bottom layer;
T is the top layer;

1 is the layer nearest the concrete
face;
2 is the second layer from the
concrete face.
NOTE B and T are used for the English
language; equivalent letters for other languages
are possible.
a) bottom and top layers shown on
separate plans

b) bottom and top layers shown on the
same plan (The bottom layer shall be
indicated by a dashed extra-wide line.)

17 Location of layers of reinforcement on
elevation drawings
where
N is the near face
F is the far face
1 is the layer nearest the concrete
face
2 is the second layer from the
concrete face
NOTE N and F are used for the English
language; equivalent letters for other languages
are possible.
a) near-face and far-face reinforcement
shown on separate elevations

b) near-face and far-face reinforcement
shown on the same elevation (The far
face layer shall be indicated by a
dashed extra-wide line.)


6 © ISO 2003 – All rights reserved

---------------------- Page: 10 ----------------------
ISO 3766:2003(E)
Table 1 (continued)
No. Description Representation
18 If the arrangement of the reinforcement is
not represented unambiguously by the
section, an additional detailed
representation of the reinforcement may be
given outside of the section.
NOTE For the representation of the bends,
see No. 1.

4.2 Prestressed reinforcement
The general representation
...