What does the outermost axis of a building mean?

Buildings generally have blueprints; can it be understood that these are the axes of the building in the blueprints?

I understand it as the outermost axis in the architectural blueprint; if the structure has protruding parts, the outermost one is taken as the reference. This is just an unrefined opinion for consideration only

The outermost axis of a building or structure is the center line of its outermost wall! The specific measurement is the distance between the outer wall edges of the two buildings (structures), plus half of the thickness of their outer walls! (My personal understanding, for reference only!) ）

I believe experts have more authority to speak on this issue; I have copied it to the civil engineering structure discussion forum. Those who are interested are invited to check it out at http://bbs.hcbbs.com/thread-413130-1-1.html

Thank you, I understand. But when actually measuring, how do I know how thick this wall is? It’s confusing. --------------------- The first time I encountered my post being copied, I wondered why the rating changed from one thing to another; now I understand. This reply was first posted in the copied thread, and it will be shared again in the safety engineering discussion area; perhaps those who are more knowledgeable in safety matters will have better insights. Looking forward to it!

Can the wall thickness be measured directly with instruments? It’s better to ask the company; if their staff are not familiar with construction knowledge... But perhaps the wall thickness, compared to the values specified in the standards, won’t have much of an impact if estimated roughly.

Generally speaking, the accuracy doesn’t need to be that high

The fire separation distance should be measured from the outer edge of the wall; there is no need to measure the thickness of the wall. Moreover, walls always have windows and doors, so what’s difficult about taking measurements?

In response to the friends above, I have stated in my reply on floor 4 that it represents my personal understanding only and is for reference purposes! Since everyone is so enthusiastic about this, I am more than happy to continue discussing and learning together with you all! 1. A bored netizen today: “The fire separation distance should be determined based on the outer edge of the wall; there’s no need to measure the thickness of the wall. Besides, walls always have windows and doors, so what’s difficult about taking measurements?” ” I will respond by replying to the original poster’s question: If the fire separation distance is to be measured from the outer edge of a wall, then why in Appendix 6 of the \"Code for Fire Protection Design of Petrochemical Enterprises\", which specifies the starting and ending points for fire separation distances, is it not specified directly as \"process unit – the outer edge of the outermost equipment or the outermost axis of buildings and structures\"? 2. During the rainy season, Haiyou 615 asked: \"Can the wall thickness be measured directly with instruments?\" It’s better to ask the company; if their staff are not familiar with construction knowledge... But perhaps the wall thickness, compared to the values specified in the standards, won’t have much of an impact if estimated roughly. ” This answer is divided into three parts: (1) “Can the wall thickness be measured directly with instruments?” ”As the bored internet friend said today, anything with windows and doors that make it easy to measure can be measured directly ； (2) “It’s better to ask the company; if their staff are not familiar with construction knowledge...” For the exterior walls of buildings that lack windows and doors and thus make direct measurement difficult, one has no choice but to ask the company or consult the relevant drawings! If neither of these approaches yields any results, I think the management level of this company and its value as an entity are... (3) “But perhaps, compared to the standards, the thickness of the wall has little impact.” ”For exterior walls with thin wall thicknesses, the estimated values have little impact on the fire separation distance; but what’s the point of citing regulations if you don’t follow them! The above opinions are purely my personal understanding and are intended solely for discussion!

It would be great if the regulations specified that the process unit is the outer edge of the most external equipment, buildings, or structures.

Appendix A of the “Code for Design of Oil Storage Tanks”: Starting and ending points for calculating spacing: Buildings or structures – axis of the exterior wall.

\"Code for Fire Protection Design of Buildings\" 3.4 Fire separation distances for factories Table 3.4.1 Fire separation distances between factories, as well as between them and warehouses of categories B, C, D, and E, as well as civil buildings (in meters) Note: 1 The fire separation distance between buildings should be calculated based on the shortest distance between the outer walls of adjacent buildings; if there are protruding combustible elements on the outer walls, the calculation should start from the outer edge of those protrusions； -------- Why isn’t it unified yet?

The Code for Fire Protection Design of Buildings does not group together the starting and ending points for calculating spacing, which is quite inconvenient.

Everyone may take a look at Article 4.3.9 of the \"Code for General Layout Design of Industrial Enterprises GB50187-1993\" ****************************************************** Note: ① Unless otherwise specified in the table, the spacing is measured from the outer wall of the cooling tower； The building is measured from its outermost axis ； The open-air production unit is measured from the outer wall of the outermost equipment ； Outdoor switching and distribution equipment, measured from the edge of the outermost framework ； The yard starts from the edge of the site ； For road types that are urban, it is measured from the edge of the road surface; for road types that are highway-type, it is measured from the edge of the road shoulder ； I believe it should be easy to understand now, right?

Understanding it is no problem, but regarding the starting and ending points of buildings, the requirements set by various codes are not consistent.