Foreword

TCVN 5895:2012 replaces TCVN 5895:1995 (ISO 8560:1986).

TCVN 5895:2012 is fully equivalent to ISO 8560:1986.

TCVN 5895:2012 was converted from TCVN 5895:1995 (ISO 8560:1986) in accordance with the provisions of Clause 1, Article 69 of the Law on Standards and Technical Regulations and Point b), Clause 1, Article 6 of Decree No. 127/2007/ND-CP dated August 1, 2007 of the Government detailing the implementation of several articles of the Law on Standards and Technical Regulations.

TCVN 5895:2012 was compiled by the Institute of Architecture, Urban and Rural Planning – Ministry of Construction, proposed by the Ministry of Construction, appraised by the Directorate for Standards, Metrology and Quality, and promulgated by the Ministry of Science and Technology.

1. Scope

1.1. This standard presents the rules for the representation of modular sizes, lines, and grids on construction drawings. The basic module M is 100 mm (see ISO 1006).

1.2. Modular sizes should be used on design drawings.

1.3. Modular sizes, lines, and grids facilitate the design and drafting process. Modular multi-grids can be added to a certain extent on structural drawings used for manufacturing and construction for orientation and positioning purposes.

1.4. Drawings with modular dimensions shall be presented in accordance with TCVN 8 and ISO 2595. If necessary, these drawings should include a note clearly indicating that modular sizes are being used.

2. Normative References

The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

TCVN 8, Technical drawings – General principles of presentation;

ISO 1006, Building construction – Modular coordination – Basic module;

ISO 2595[1], Building drawings – Dimensioning of production drawings – Representation of manufacturing and work sizes.

3. Designation of Modular Sizes

3.1. Drawings with dimensions given in modular form (instead of millimeters or meters) should have a clear note explaining that modular dimensioning is being used.

3.2. The designations of modular sizes are as follows:

– Module: n × M;

– Basic module: M;

– Multi-module: 3M, 6M, 12M;

– Modular size: 10M;

– Modular multi-sizes: 10×3M, 5×6M.

– Non-modular, if necessary: M

4. Representation of Modular Lines and Sizes

4.1. Modular lines and multi-module lines are drawn using continuous lines (See Figure 1). At the lowest elevation, thin continuous lines are typically used on drawings.

Figure 1 – Modular lines and multi-module lines

4.2. When clear representation is required, long-dash dotted thin lines may be used to draw modular lines at axis positions (See Figure 2).

Figure 2 – Modular lines at axis positions

4.3. For easy identification, a circle drawn with a thin continuous line shall be placed at the end positions of multi-module grid lines (See Figure 3).

Figure 3 – Identification of modular grid lines

4.4. Modular lines can be identified by a number inside a circle as shown below (See Figure 4).

Figure 4 – Numeric designation inside a circle

4.5. Within the size limits of a modular area, dimensions are drawn in the same manner as for ordinary dimensions (See Figure 5).

Figure 5 – Size limits of a modular area

5. Representation of Modular Grids

5.1. Modular grids are drawn using modular lines.

5.2. Modular grids with overlapping grid cells of different sizes are drawn as follows: smaller grid cells are drawn with thinner lines, and larger grid cells are drawn with thicker lines (See Figure 6).

Figure 6 – Modular grids – redraw figure

5.3. The representation of the size of the spacing between modular grid lines is shown in Figure 7.

Figure 7 – Representation of the size of the spacing between modular grid lines

5.4. The representation of modular areas or non-modular areas is shown in Figure 8.

Figure 8 – Representation of modular areas

5.5. The representation of a change in direction of the modular grid is shown in Figure 9.

5.6. The representation of a shift in the modular grid is shown in Figure 10.

5.7. The representation of the axis position of a modular line using a long-dash dotted thin line is shown in Figure 11.

Figure 11 – Representation of the axis position of a modular line

6. Combination of Modular Sizes and Work Sizes on the Same Drawing

An example of modular sizes and work sizes being used together on the same drawing is shown in Figure 12.

Unit of measurement is millimeters

Figure 12 – Modular sizes and work sizes

[1] This ISO standard has been withdrawn