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基坑(槽、管沟)开挖,采用连续垂直板式支撑挡土时,其横垫木和横撑木的布置有等距和不等距两种方式。前者挡土板厚度按最下面受土压力最大的板跨进行计算,需要厚度较大,不够经济;后者板厚按等弯矩受力计算,较为合理,也是实际常用布置方式,其垂直挡土板厚度,可按以下简化方法计算。计算简图如图1所示,横垫木和横撑木的间距为不等距支设,随基坑(槽、管沟)深度而变化,土压力增大而加密,使各跨间承受弯矩相等。
When excavating foundation pits (grooves and trenches) and adopting continuous vertical slab support for retaining soil, the arrangement of horizontal and vertical bracing wood is equidistant and unequal. The thickness of the former retaining plate is calculated according to the plate span with the maximum pressure under the lowest soil. It needs a large thickness and is not economical. The thickness of the latter is calculated based on the constant bending moment, which is reasonable, and it is also a practical commonly used layout method. The thickness of soil plates can be calculated by the following simplified method. The calculation diagram is shown in Fig. 1. The spacing between the cross-wood and the cross-brick is set at an unequal distance. It varies with the depth of the foundation pit (groove and trench), and the earth pressure is increased and encrypted so that the cross-section can withstand. The moments are equal.