1 application of open caisson construction technology
The open caisson construction technology does not need a large site, which has strong integrity, small impact on the surrounding environment, large affected area, good stability and can bear large loads. In the urban pipeline construction project, open caisson construction technology can be selected to avoid too large excavation area and hinder traffic, so it has been widely used in urban construction. The open caisson construction technology is to build a shaft-like structure, excavate from it, sink to the design elevation by its own gravity, and finally seal the bottom with concrete and fill in the well hole to complete the open caisson construction technology. The construction process mainly includes foundation treatment, static bottom sealing, foundation pit excavation, capping and open caisson production. In the implementation of open caisson construction technology, we must pay attention to strengthening the observation of open caisson sinking process according to the geological conditions of the construction site. In the design of open caisson, it is necessary to closely check the sinking hydrochloric acid and the included angle, and adjust and analyze the changes in time to ensure the construction quality of open caisson and meet the construction requirements.
2. Application of construction technology of bored pile with mud wall protection
At present, the process materials and construction equipment are constantly innovating, and some new geotechnical engineering construction technologies are derived and widely used. In modern geotechnical engineering, the commonly used construction technology is bored pile technology with mud wall protection. This technology has no vibration and noise, and the backlog is small. It is suitable for strata with shallow groundwater level. The principle of construction technology is to carry mud and slag, and protect the wall to prevent collapse. Finally, the underwater concrete pouring method is used to replace the mud. It includes pile positioning, concrete pouring, casing embedding, connecting conduit, drilling rig in place, primary and secondary hole cleaning, drilling and other construction procedures. In the whole construction process, we must pay attention to the construction according to the engineering design and construction scheme, and verify that it meets the design requirements through the pile test procedure.
3. Application of shotcrete construction technology
Shotcrete construction technology is an important reinforcement method in modern geotechnical engineering construction technology. Good durability, high mechanical properties, suitable for deep foundation pit support. Through the combined use with steel mesh, its technological process includes bottom treatment, spraying, water spraying and wetting, mixture mixing, preparation, fixation and maintenance of steel mesh. In the application process, we must pay attention to the reasonable selection of residential spraying materials and the maintenance of spraying equipment to ensure the strength of concrete.
4, the application of foundation treatment construction technology
At present, China's foundation treatment construction technology is relatively mature, and the whole building movement technology has reached the advanced level in the world. Construction technologies such as steel slag pile composite foundation and muck inspection foundation have been developed and designed by engineers and technicians in combination with the actual geotechnical engineering characteristics. By adopting these technologies, the bearing capacity of foundation is high, in addition, it can reduce urban pollution, reduce the cost and cost of geotechnical engineering, improve the surrounding environment and save engineering resources. Among them, the new foundation treatment construction technology is reinforced concrete sparse pile rechecking foundation technology, which combines the dual characteristics of pile foundation and composite foundation, is conducive to exerting its own bearing capacity and effectively controlling the settlement of structures. Foundation treatment underpinning technology has developed rapidly and is widely used in various geotechnical engineering. Trenchless technology is a new type of geotechnical engineering construction technology, which requires the replacement, detection and laying of underground pipeline equipment without excavating the surface, which has high economic benefits and certain social benefits.
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