Research on cold-insulation and protection for safety overwintering of deep foundation pits in Mongolia
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摘要: 在实际工程中，通常存在一些规模较大，施工工期较长，需要越冬的基坑。而基坑的安全越冬，必须做好保温防护工作。本文依托蒙古国首都乌兰巴托市某建筑深基坑工程，对深基坑安全越冬保温防护技术开展研究，通过采用B2级聚苯板对基底土进行保温防冻；采取搭设暖棚的方式对基坑侧壁渗漏区域进行保温；采用电伴热，外加岩棉的保温措施，使基坑正常降水。根据现场实际施工情况，以上的保温防护技术对基坑安全越冬是有效的，并可为今后基坑工程安全越冬的保温防护提供借鉴。Abstract: In practical construction， there are usually some foundation pits with large scale， long construction period and are overwintering. Therefore， the work of proper cold-insulation and protection needs to be done. Based on a deep foundation pit project of a building in Ulaanbaatar， the capital of Mongolia， this paper studies the cold-insulation and protection technology for safety wintering of deep foundation pits. B2 grade polystyrene board is used to insulate and prevent freezing of the soil at the bottom of the pit. Greenhouse was built to keep the leakage area on the side wall of the foundation pit warm. Measures of electric heat tracing and insulation with rock wool are adopted to ensure normal dewatering of the foundation pit. The actual construction situation confirmed the effectiveness of the above technology， which can provide reference for the insulation and protection of safe overwintering of foundation pit projects in the future.
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