What is the difference between elevation, section and section elevation?

The differences between elevations, sections and section elevations: different formations, different expression contents, and different drawing lines

1. Different formations

Plan drawings Formation: The building plan is to use an imaginary horizontal cutting plane to cut the house along a position slightly higher than the window sill, remove the upper part, and make an orthographic projection of the remaining part to the horizontal plane. The resulting horizontal section is called a building plan, or simply a plan. . ?

Section diagram: Imagine using one or more vertical cutting planes to cut the building. The resulting section diagram is called a building section diagram, or section diagram for short. ?

The formation of section elevation: The orthographic projection made on the vertical projection plane parallel to the building facade is called building elevation, or elevation for short.

2. The content expressed is different

Plan plan: reflects the plane shape of the new building, the location, size, and mutual relationship of the rooms, the location, thickness, materials, and column sections of the walls. Shape and size, location and type of doors and windows. ?

Cross-section drawing: Building cross-section drawing is used to show the internal structural structure of the building, the vertical layering situation, the structure of the floor and roof of each floor and related dimensions, elevation, etc. ?

Sectional elevation: reflects the height, appearance and decoration requirements of each part of the house, and is the main basis for the exterior decoration of the building.

3. Different drawing lines

Plan view: The plan view is essentially a cross-sectional view, and the contour lines of walls, columns, etc. cut by the cut plane are represented by thick solid lines. Uncut parts such as outdoor steps, drainage, stairs and dimension lines are represented by thin solid lines. The opening line of the door is represented by a thin solid line.

Section diagram: The indoor and outdoor floor lines are represented by thickened solid lines; the part below the ground is disconnected from the foundation wall and is also represented by the structural construction drawing; the proportion of the section diagram should be consistent with the plan and elevation drawings The proportions are consistent.

Sectional elevation: The outline of the elevation is represented by a thick solid line; the outdoor floor line is represented by a thick solid line that is 1.4 times thicker (the line width is about 1.4 times that of the thick solid line); Door and window openings, cornices, balconies, awnings, steps, etc. are represented by medium solid lines; the rest, such as wall dividers, door and window lattice, rainwater pipes and lead-out wires, etc. are represented by thin solid lines. ?

Extended information:

Types of cross-sections: full cross-section, half cross-section, stepped cross-section, expanded cross-section

Full cross-section: use A cutting plane completely cuts the shape, and the resulting cross-section is called a full cross-section.

Half-section: If the body is symmetrical, half of the body's projection is often drawn as a cross-section and the other half is drawn as an outline. The combined projection is called a half-section.

Step section: It is inconvenient to cut two holes at the same time. Therefore, two parallel planes are used to cut through the two holes. In this way, two holes that are not in the same direction are reflected at the same time on the same section view. This method uses two or more mutually parallel cutting planes to cut the shape, and the resulting cross-section is called a stepped cross-section.

Expanded section: Use two intersecting cutting planes to cut the shape. The resulting section is expanded by rotation, parallel to a certain basic projection, and then orthogonally projected. It is called an expanded section. .

Reference materials:

Baidu Encyclopedia - Floor plan

Baidu Encyclopedia - Sectional view

Baidu Encyclopedia - Elevation view