Anti-cracking measures for construction of autoclaved lime-sand brick machine equipment:
Because some properties of autoclaved lime-sand brick machine equipment are quite different from those of fired bricks, corresponding technical measures must be taken in use, such as anti-cracking measures, and some methods need to be taken to prevent cracking of the wall and strengthen the wall.
① When calculating unreinforced masonry compression members, the influence coefficient ψ value should be determined by the height-thickness ratio and eccentricity, and the autoclaved lime-sand brick machine equipment products should multiply the height-thickness ratio of the member by the adjustment factor γβ (1.2).
② Reasonably set expansion joints.
It is stipulated that the distance between the expansion joints of masonry houses made of autoclaved lime-sand brick machine equipment should be 0.8 times that of the expansion joints of sintered ordinary brick masonry houses to reduce the distance between expansion joints.
③Due to the dry shrinkage of the block material, a certain shrinkage stress is generated inside the masonry of the autoclaved lime-sand brick machine equipment. When the tensile and shear strength of the masonry is not enough to resist the shrinkage stress, cracks will occur . Therefore, in the places where the stress is concentrated, such as the masonry above the door and window lintel and under the window sill, welded steel mesh should be installed to resist the stress caused by brick shrinkage. In addition, when the length of this type of wall is greater than 5m, it is easy to be pulled apart, so it should also be properly reinforced.
The specific method is: design welded steel mesh or 2Φ6 steel bars in the horizontal gray joint above the door and window lintel and in the first and second horizontal gray joints under the window, and its extension into the wall between the windows on both sides is not less than 600mm; The length of the solid wall is greater than 5m, and 2 to 3 welded steel mesh pieces or 3Φ6 full-length horizontal steel bars are installed in the middle of each layer of the wall, and the vertical spacing is 500mm.
Like we usually use clay bricks to build a house at home, there are often cracks on the roof of the flat house, causing water leakage, or even water seepage into the house. Using the bricks produced by the autoclaved lime-sand brick machine equipment, anti-cracking measures can be taken during construction, which can be effective Prevent wall cracks.
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