Arch constructions in masonry, semicircular arch
This learning path gives us an insight into constructing a semicircular arc. We're going to see how we draw a semicircular arch, formally place and brick it.
You can see very clearly in this video how we draw a semicircular arch.
1: Determine the span A - B
2: Take half of this ( the radius) point P
3: Draw the circle
4: Poke point is P
You do the same for making a mold for the semicircular arch.
* Build the mold with two fiberboards on either side and a piece of flexible sheet material to seal the top.
* The width of a mold corresponts to the width of a brick.
* Use a masonry cord and nail as a compass to draw the circle and a jigsaw to cut out the mold.
* You have to support the mold with trellis.
* Secure the mold and adjust it perfectly.
1: We do not take 1.2cm as a joint, but 1cm, so the joint at the top does not show so wide.
2: Measuring the circumference of the arc on the formal = the arc field.
3: Subtract 1 joint from this size.
4: Determine the desired layer size, the thickness of the stone + the joint ( 1cm).
5: Calculate the number of layers.
6: Size - 1 joint dividing by the desired layer size= the number of bricks.
7: If the calculation is not correct, round up if the decimal point is higher than 5, lower than 5, round down.
Example:
Arc field = 96.2cm
The size-1joint thickness= 96.2cm - 1 cm = 95.2cm
Thickness of the stone = 5.8cm + 1cm joint thickness = 6.8cm
Number of the stones in the arch= 95.2cm : 6.8cm = 14 stones
New layer size semicircular arc= 95.2cm : 14 stones= 6.8cm ( remains the same)
It is not always the case that the layer size of the arch is the same as the desired layer size( ascending masonry)
Watch the video and explain what you see and hear.
......................................................................................................................................................................................................
......................................................................................................................................................................................................
......................................................................................................................................................................................................
....................................................................................................................................................................................................
.....................................................................................................................................................................................................
This requires craftmanship.
No mortar should end up on the formal.
Layer size must be written off perfectly.
* Has a higher stability than a segment arc.
* Does require a solid foundation.
* Also considered ornamental masonry.
* Gives the façade a nicer and more rustic view.
1:
Resource information