Excavation of Large Soft Soil Foundation Pit
In the process of urban construction, foundation pits are indispensable, and deep foundation pits are often used for large-scale building construction, especially deep foundation pits in soft soil areas. Among them, the excavation of large soft soil foundation pits is an important part of urban construction and a very difficult construction project.
The excavation of large soft soil foundation pits is mainly used for the construction of deep foundation pits below the metro, building foundation and other underground high-energy reinforced structures. The depth of soft soil foundation pits is generally more than 15m, and the bottom width and separation length are also large. The structure of excavation and support is very complicated, the construction period is long, and the safety level is high.
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1. Features of large soft soil foundation pits
Large soft soil foundation pits generally refers to pits of 15m or more in depth. Excavation and support of such foundation pits requires large amounts of excavation, transportation and capacity of materials, as well as advanced construction technology. In addition, the large soft soil foundation pits should also meet the requirements of environmental protection, economic benefits and safety, so the construction difficulty and test are also very high.
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2. Technological process of large soft soil foundation pit excavation
The excavation of large soft soil foundation pits is mainly composed of the following technological processes: cushion material excavation, cushion construction, soil excavation, rigid frame construction, slush and small fountain construction. Among them, the cushion construction is an important part of the excavation process. The cushion is mainly composed of cushioning material and hydraulic prop. The cushion is destructively connected with the soil in a certain space, and the cushioning material helps to resist the lateral force of the soil. In addition, when excavating the deep soil, advanced sealing equipment and technology should also be used to prevent the leakage of soil outside the excavation.
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3. Safety Precautions for Large Soft Soil Foundation Pit Excavation
The excavation of large soft soil foundation pits should be carried out in accordance with relevant safety regulations, and construction safety should be emphasized in the whole process. First, before the foundation pit excavation, the constructors shall understand and execute the grounding protection and safe distance of the original power supply and communication lines, and take measures to strengthen protection as required. Second, during the foundation pit excavation, strict attention should be paid to the monitoring of the ground settlement and the lateral displacement of the surrounding buildings to avoid accidents caused by ground subsidence or damage to the buildings. Third, in the construction of cushions, supporting staff should pay close attention to the position and load of the props to ensure safety. Finally, relevant safety regulations should be established and clearly implemented to strengthen the safety management of the large-scale soft soil foundation pit excavation.
In conclusion, the excavation of large soft soil foundation pits is a very difficult and important construction project. Technical difficulties and safety considerations put forward higher requirements for construction management. In order to ensure the successful completion of the excavation project, advanced construction technology and meticulous safety precautions should be followed in the whole process.
