Foreword

TCVN 6080:2012 replaces TCVN 6080:1995 (ISO 2594:1972)

TCVN 6080:2012 is completely equivalent to ISO 2594:1972

TCVN 6080:2012 is converted from TCVN 6080:1995 (ISO 2594:1972) 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 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 6080:2012 is 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 of Application

This standard defines two projection methods applicable to construction drawings, including:

– Direct orthogonal projection;

– Mirrored orthogonal projection;

and provides symbols related to each method.

2. Direct Orthogonal Projection

Direct orthogonal projection is the representation of an object by the intersections of projection rays perpendicular to a plane. The view shows the shape of the object facing the observer’s eyes. The orthogonal projection method is widely used (See Figure 1).

Figure 1 – Direct orthogonal projection method

3. Mirrored Orthogonal Projection

Mirrored orthogonal projection is the replication of the image of an object in a mirror when the mirror is placed parallel to the horizontal planes of the object.

Figure 2 – Mirrored orthogonal projection method

4. Notation

The symbol used for direct orthogonal projection is shown in Figure 1: Two parallel arrows perpendicular to a thin dash-dotted line.

The symbol used for mirrored orthogonal projection is shown in Figure 2: Two double arrows perpendicular to a long dash-dotted line.