What is the minimum distance between head openings?
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Does it mean straight line distance? Or is it the distance between the head surface curve? Does it mean the center distance of the opening? Or the minimum distance for opening? Thanks!
Regardless of the head or the cylinder, the opening distance should refer to the surface distance between the center lines. Personally, I understand it this way. It only refers to the surface distance, mainly considering the area of steel that plays a reinforcing role.
1. It refers to the curve distance on the surface of the head, just like the cylinder, the arc length calculated based on the outer diameter of the cylinder； 2. Refers to the center distance of the opening
The same as the point on the 4th floor, it refers to the distance between the centers of the curves on the surface of the head.
It should refer to the surface distance. You can refer to GB150-1998 Article 8.3 b) The distance between the centers of two adjacent openings (calculated as arc length for curved surface spacing) should not be less than twice the sum of the diameters of the two holes.
1. It is the curve distance of the head surface； , 2. Refers to the hole center distance
GB/T150.3-2011 6.3.1 stipulates the applicable scope of a single opening. The center distance between two openings on the shell (the distance between curved surfaces is calculated as arc length) shall not be less than the sum of the diameters of the two holes. 6.4 Equal area method for multiple opening reinforcement