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A platform for research: civil engineering, architecture and urbanism
Anti-leakage treatment method for deep foundation pit excavation in water-rich silt stratum
The invention provides an anti-leakage treatment method for deep foundation pit excavation in a water-rich silt stratum. The treatment method comprises the following specific steps that firstly, WSS slurry injection is adopted at the joint position of a continuous wall outside a foundation pit, then dewatering wells are arranged outside the foundation pit to reduce water pressure, a water pump isplaced in each dewatering well, manual exploration and excavation are started from second-layer earth excavation in the deep foundation pit, a Luoyang shovel is adopted for exploration and excavationto explore the water leakage situation of the joint positions of the underground continuous wall at the underground wall joints, and plugging measures are taken according to the water leakage situation; and after it is confirmed that all underground continuous wall joints of a manual exploration and excavation bin section are free of the water leakage situation, a slurry injection platform is arranged beside the foundation pit, meanwhile, multiple sand backfill windows are formed in the outer side of the foundation pit, and in the mechanical excavation process of the foundation pit, emergencytreatment is carried out in a slurry injection and concrete backfill manner under the water seepage condition. According to the method, the risk of water gushing and sand gushing is avoided, the effect that the subway deep foundation pit is rapidly and stably excavated to expose the bottom is achieved, the construction period is shortened, and the cost is saved.
本发明提供了一种富水粉砂地层深基坑开挖防渗漏处理方法。所述处理方法具体步骤如下：首先在基坑外连续墙接头位置采用WSS注浆，然后在基坑外布设降水井降低水压力，并在每个降水井内放置水泵，在深基坑内从第二层土方开挖开始进行人工探挖，并采用洛阳铲探挖在地墙接缝处探查地下连续墙接缝位置渗漏水情况，根据渗水情况采取封堵措施；在确认人工探挖仓段全部地下连续墙接缝无渗漏水情况后，在基坑边设置注浆平台，同时在基坑外侧开设多个沙料回填窗口，在基坑机械开挖过程中，遇到渗水情况采用注浆和混凝土回填的方式进行应急处理。本发明规避了涌水涌砂的风险，达到了地铁深基坑快速平稳开挖见底的效果，缩短了工期，节约了成本。
Anti-leakage treatment method for deep foundation pit excavation in water-rich silt stratum
The invention provides an anti-leakage treatment method for deep foundation pit excavation in a water-rich silt stratum. The treatment method comprises the following specific steps that firstly, WSS slurry injection is adopted at the joint position of a continuous wall outside a foundation pit, then dewatering wells are arranged outside the foundation pit to reduce water pressure, a water pump isplaced in each dewatering well, manual exploration and excavation are started from second-layer earth excavation in the deep foundation pit, a Luoyang shovel is adopted for exploration and excavationto explore the water leakage situation of the joint positions of the underground continuous wall at the underground wall joints, and plugging measures are taken according to the water leakage situation; and after it is confirmed that all underground continuous wall joints of a manual exploration and excavation bin section are free of the water leakage situation, a slurry injection platform is arranged beside the foundation pit, meanwhile, multiple sand backfill windows are formed in the outer side of the foundation pit, and in the mechanical excavation process of the foundation pit, emergencytreatment is carried out in a slurry injection and concrete backfill manner under the water seepage condition. According to the method, the risk of water gushing and sand gushing is avoided, the effect that the subway deep foundation pit is rapidly and stably excavated to expose the bottom is achieved, the construction period is shortened, and the cost is saved.
本发明提供了一种富水粉砂地层深基坑开挖防渗漏处理方法。所述处理方法具体步骤如下：首先在基坑外连续墙接头位置采用WSS注浆，然后在基坑外布设降水井降低水压力，并在每个降水井内放置水泵，在深基坑内从第二层土方开挖开始进行人工探挖，并采用洛阳铲探挖在地墙接缝处探查地下连续墙接缝位置渗漏水情况，根据渗水情况采取封堵措施；在确认人工探挖仓段全部地下连续墙接缝无渗漏水情况后，在基坑边设置注浆平台，同时在基坑外侧开设多个沙料回填窗口，在基坑机械开挖过程中，遇到渗水情况采用注浆和混凝土回填的方式进行应急处理。本发明规避了涌水涌砂的风险，达到了地铁深基坑快速平稳开挖见底的效果，缩短了工期，节约了成本。
Anti-leakage treatment method for deep foundation pit excavation in water-rich silt stratum
富水粉砂地层深基坑开挖防渗漏处理方法
XIA MINGTAN (author) / ZOU CHUNHUA (author) / MEI CAN (author) / LONG HUADONG (author) / ZHANG ZHIBING (author) / ZHOU KUN (author) / LI YINGJIAO (author) / LIU XIN (author)
2020-12-08
Patent
Electronic Resource
Chinese
IPC:
E02D
FOUNDATIONS
,
Gründungen
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