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某商业步行街工程的基坑支护采用预应力锚杆与钢筋混凝土灌注桩的支护形式。尤其临近商业大厦的支护为三边支护,其方案与设计、施工工艺标准、位移与倾斜观测等在支护方面具有代表性。支护桩的设计采用朗肯公式,分别计算主动土压力和被动土压力,再进行结构配筋计算。支护桩的施工技术涉及降水、混凝土灌注桩、预应力锚杆等的施工,其施工工艺执行设计要求和规范标准。降水要保证土方开挖需要,灌注桩定位成孔浇灌必须工序合理质量保证,锚杆要压力注浆,张拉到位。监测表明本支护工程安全可靠。
The foundation pit support of a commercial pedestrian street project uses the support form of prestressed anchors and reinforced concrete bored piles. Especially for commercial buildings near the support for the three sides of the support, the program and design, construction technology standards, displacement and tilt observation in support of the representative. The design of retaining pile uses Rankine's formula to calculate active earth pressure and passive earth pressure respectively, and then calculate the reinforcement of structure. The construction technology of supporting piles involves the construction of precipitation, concrete bored piles and prestressed anchors, etc., and the construction technology of the bored pile shall meet the design requirements and normative standards. Precipitation to ensure the needs of earth excavation, pouring piles positioned into the hole watering process must be reasonable and reasonable quality assurance, anchor pressure grouting, tension in place. Monitoring shows that the support project is safe and reliable.