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近年来,国内伴随高层建筑的深基坑工程日趋增多,基坑深度也愈来愈深。例如北京京城大厦基坑深达23.50米。有些深基坑与现有高大建筑物,重要构筑物,交通干线或地下管道相距甚近。如扩建中的北京新侨饭店,其深达14米的基坑与现有建筑基础相距仅1.40米。为确保诸如此类深基坑旁现有建筑物以及深基础施工的绝对安全,必须有一整套使基坑周边土体稳定的护坡工程。国内深基坑护坡工程除少数采用地下连续墙施工工艺外,较多地采用护坡桩施工工艺。护坡桩目前以采用钢筋混凝土灌注桩的居多,也有用打入式钢板桩或钢
In recent years, the number of deep foundation pit projects accompanying high-rise buildings in China has increased and the depth of foundation pits has deepened. For example, the depth of the foundation pit of the Beijing Capital Building is 23.50 meters. Some deep foundation pits are in close proximity to the existing tall buildings, important structures, major traffic lines or underground pipelines. For example, in the expansion of Beijing Xinqiao Hotel, its deep foundation of 14 meters is only 1.40 meters away from the existing building foundation. In order to ensure the absolute safety of existing buildings such as these deep foundation pits and the construction of deep foundations, there must be a complete set of slope protection works to stabilize the surrounding soil of the foundation pit. In addition to a small number of underground continuous wall construction technologies, most of the deep foundation pit slope protection projects in China use slope protection pile construction techniques. Slope protection piles are mostly made of reinforced concrete cast-in-place piles and are also used as driven steel sheet piles or steel.