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在有些城市,地基较差,地面以下1～2m处为房渣土,地耐力偏低,同时地下人防通道颇多,一般最浅的人防通道顶距地面仅有1.5m左右。如果这些地段进行改建工程,往往建房面积紧张,四周房屋又大多属于老式灰土砖房,而且都已陈旧,鉴于以上情况,要求所建(或改建)的房屋基础不能埋得太深,以免挖基槽时,造成邻近房屋倒塌;同时, 改建房屋需要尽量靠近老房子,以便争取多一点面积。为此我们在新建或改建1～3层楼的房屋时,采用了不埋式筏基,效果较好。
In some cities, the foundation is poor, and 1-2m below the ground is house dregs, and the endurance is low. At the same time, there are many underground civil air defense passages. Generally, the shallowest air defense passage is only about 1.5m above the ground. If these areas are reconstructed, often the building area is tense, and most of the surrounding houses are old-fashioned lime-cement brick houses, and they are all old. In view of the above situation, it is required that the built (or rebuilt) housing foundation cannot be buried too deep to avoid digging. In the base slot, the neighboring houses collapsed; at the same time, the converted houses need to be as close as possible to the old house in order to gain more space. For this reason, when we built or reconstructed 1 to 3 stories of buildings, we used a non-buried ramie base and achieved good results.