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某勘察队在长沙地区以机动洛阳铲夯扩灌注桩机进行住宅楼地基施工中,先后遇到四种不利情况,其处理方法如下: 1.穿过粉土层。设计要求将桩端扩大头置于粗砾砂之上,故施工时必须挖至粉土层底部再加入干砼才能达到设计目的。为防止孔深渗水,挖至粉土层顶部时立即加入干砼进行夯扩,并增加夯扩次数和干砼的加入量。这样,桩虽减短,但桩端扩大许多,单桩承载力不会低于设计要求。 2.桩孔大量渗水。在粉土层成孔时孔深超出套管的长度不得大于0.50m,否则孔内将大量渗水。可在渗水初期快速地边加入干砼边夯扩。刚开始时有水从孔中挤出,冲出孔口,孔内水量随即减少,最后
A survey team has encountered four unfavorable conditions in the construction of residential buildings in Luoyang Shovel dipping and grouting machine in Changsha area. The treatment methods are as follows: 1. Through the silt layer. The design requires that the end of the pile head be placed on top of the coarse gravel, so the construction must be digging to the bottom of the silt layer and then adding dryness in order to achieve the design goal. In order to prevent the water from seepage in the hole, the dry earthworms shall be added to the top of the silt layer immediately to carry out the expansion, and the number of squeezing and the amount of dried cockroaches shall be increased. In this way, although the pile is shortened, the pile end is expanded to a large extent, and the bearing capacity of a single pile will not be lower than the design requirement. 2. A lot of water seepage in the pile hole. When the silt layer is formed into a hole, the depth of the hole beyond the length of the bushing shall not be greater than 0.50 m, otherwise, a lot of water will seep in the hole. In the initial stage of water seepage, it can be quickly added while drying. At the very beginning, there was water squeezing out of the hole and flushing out of the hole. The amount of water in the hole then decreased.