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Sino-Expansion Co, Ltd
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  Crack width of the front row is opened much larger than that of the behind rows.

  Square Arrangement
  (2) Avoid diagonal crack


  The curvature at corner (R) should be more than 15 cm (6').
  (3) Splitting of Wall


  (4) Splitting of Slab



 

 (5) Establishment of free surfaces



  In stead of Burn Cut (chapter 6 of Rock), cross drilling may be used to establish the free surface for wall case.


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13707380851