When preserving both sides of the construction hole, the masonry shall be built into a horse-jacket and horizontal tie bars shall be placed, and beams shall be installed at the upper mouth, and the height shall not be greater than 1.4m.
In the reserved construction hole on both sides, should be built into a horse's teeth and placed horizontal pull ribs, the upper mouth is set, the height should not be greater than 1.4m.
When reserving both sides of the construction opening, it should be built into a horse toothed tenon and placed with horizontal tie bars, and a lintel should be set at the upper opening, and the height should not be greater than 1.4m.<br>