corner wall crack fixing?

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Hello,

My garden wall has developed some cracks from subsiding. There was a big tree nearby which was removed last year. Some smaller cracks are in the middle of the wall and a big one from top to bottom in the corner. I started from the main body of the wall, cleaning the cracks and pouring mortar inside the crack with mortar gun. I will install some wall crack stitching bars in the horizontal brick joints. I do a crack every weekend so the mortar in the first crack is set before moving to the next one.
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The big question is what is the best way to fix the big crack in the corner? I was thinking to make a small frame in the corner with a 20cm wide plank to form a triangular frame along the edge of the wall corner. Then pour concrete inside from the top so it goes inside the crack and forms a kind of thin pillar/buttress in the corner? Any ideas?



PS: I am not sure how to show the wall photo?
 
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Fixing expamet lath to the corner would normally be sufficient after fitting the crack ties, unless the wall is leaning then pouring a butt wouldnt do any harm.
 
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Just to add that the wall is 2m tall
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