1. For the backfill in the first floor ground house, it should be filled and compacted in layers, and should not contain sundries and large frozen blocks. The backfill in winter construction should take insulation measures. Large-area concrete cushions such as hallways, halls, and waiting rooms should be poured in blocks, or appropriate reinforcement measures should be taken to reduce surface cracks caused by ground subsidence and cushion concrete shrinkage. the
2. For the height of the foundation brick wall at the door or door opening, the maximum height shall not exceed the lower skin of the concrete cushion, and the concrete cushion shall have a certain thickness; when the terrazzo surface is made at the door or door opening, grids shall be pasted on both sides of the door strips to avoid cracks in this area. the
National construction of terrazzo slab floor
3. The concrete cushion on the cast-in-place terrazzo floor should have a certain curing period after pouring, so that the surface layer can be constructed after the shrinkage is basically completed; for larger or uneven load distribution, the concrete cushion should be added Two-way Ф6＠150~200mm steel bars to increase the integrity and rigidity of the cushion. The slab joints and end joints of precast concrete slabs must be densely poured with fine stone concrete. the
The setting of concealed cable ducts should not be too concentrated, and there must be at least 20mm of concrete protective layer on the top of the pipeline. If it is unavoidable that the cable ducts are too concentrated, the practice of adding reinforcement mesh should be adopted in the cushion. the
4. Seriously do a good job in the treatment of the surface of the base layer to ensure that the surface of the base layer is flat, the strength is sufficient, the settlement is minimal, and the surface is clean, free of debris, and firmly bonded. the
5. The mortar or concrete of the existing terrazzo should be dry and hard as much as possible. Because the concrete slump and mortar consistency are too large, it will inevitably increase the chance of shrinkage cracks, causing hollow cracks on the terrazzo floor. the
6. When designing the grid of the terrazzo surface, avoid the generation of long and narrow grid strips to prevent cracks caused by the shrinkage of the surface.
