Brickwork conundrum

[Firefly16]

I want to build a sloping road overbridge. The courses of the parapets are parallel with the angle of descent in the road level view in the only photo of such a bridge I have found so far but what about those below road level? At what point, if any, are they laid horizontally? I can't imagine the sloping courses being continued all the way down to the floor but, on paper, a change at either road/footway level or at the spring of the arch doesn't look right either. Any information would be much appreciated!

[Richard08]

I'd stick with horizontal - this is a bridge not a million miles from here, it's stone but that probably doesn't make any odds.

[heda]

I agree with Richard, all horizontal. The other option might be to lay the top three or four courses to the same slope as the road using a thin strip of brick card or paper or whatever your using.
It's going to be what looks right to you.
Dave

[Peterm]

Horizontal every time.

[stuartp]

Agreed, horizontal for that part of the bridge (the arch) doing the load bearing work. The parapets may follow the slope of the road because a brick parapet is not load bearing, it's just there to add mass and stop things falling off the edge. The change in courses would usually be separated with a string course.

Not quite what I was looking for but see the last photo on here- the rubble courses forming the arch are horizontal and the parapet is all over the place !

https://www.buildingconservation.com/ar ... ridges.htm

[Lancastrian]

This is a link to the very first 'Skew' bridge built by George Stephenson over the Liverpool to Manchester railway line in Rainhill in 1824.

Not sure if it will be of help or not.

http://www.rainhill-civic-society.org.u ... 1skew.html

Some more photographs here on my website:

http://www.fgo.org.uk/index.php?option= ... mitstart=3


Added to initial post:
Sorry misread you post, I thought you wanted it on angle just realised you want it to slope down.

[Firefly16]

Thank you, Gentlemen, for your replies. As is the way with these things, I've just found the answer in a photo of a retaining wall that slopes down to floor level; the coping and first few courses slope after which the remainder are horizontal - different structure same practice. Once gain, my thanks.