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南昌市某工厂车间地坪,由于回填土是黄土状亚粘土,具有湿陷性,在受水(雨水、生活污水)的侵蚀后,发现混凝土面层与碎石垫层有1～7cm的缝隙,个别地方达15～20cm。从地表面看有些房间面层已有明显的下沉,严重的下陷达6～7cm。经实地勘探和研究后,我们采用灌浓水泥浆的处理方法。结果既填充了缝隙,又将塌陷的面层抬平、恢复到原来的水平面上,效果良好。具体做法如下: 1、钻孔:在面层上用冲击电钻(Φ22mm钻头)打眼,采用梅花状布孔,孔距、排距为3～4m。然后在孔中插入6/8″铁管(外露20cm左右)作为注浆管以便接进浆胶管。
Nanchang City, a factory floor, due to the backfill soil is loess-like sub-clay, collapsible, in the water (rain, domestic sewage) erosion, found that the concrete surface and gravel cushion 1 ~ 7cm gap , individual places up to 15 ~ 20cm. From the surface of the ground, the surface of some rooms has been clearly submerged, with severe subsidence of 6 to 7 cm. After on-site exploration and research, we adopted the method of processing concentrated cement slurry. As a result, the gap is filled, and the collapsed surface is lifted and restored to the original horizontal surface. The result is good. The specific methods are as follows: 1. Drilling: Drill the surface with an impact drill (Φ22mm drill bit), and use a plum-shaped cloth hole with a hole spacing of 3 to 4m. A 6/8" iron tube (with an exposed thickness of about 20 cm) was then inserted into the hole as a grouting tube to allow access to the slurry hose.