Foundation pit support device and construction method

Abstract

The invention relates to a foundation pit support device and a construction method. For different address conditions, two or more of an SMW (soil mixing wall) construction method pile system, an internal supporting system, a concrete revetment system and a soil nailing wall revetment system are comprehensively applied. A concrete circuit girt is arranged at the top end of an SMW construction method pile; and profiled bars are inserted into the pile, and have equal or unequal lengths. The internal support system is a slanting steel pipe support or a horizontal support. The soil nailing wall revetment system is formed in a way that: a concrete revetment is arranged on the inner side, from the pit top to the pit bottom, of a foundation pit, and is paved with a reinforced concrete surface layer; and soil nails are inserted into soil around the foundation pit vertical to the reinforced concrete surface layer. The foundation pit support device and the construction method have the advantages of effectively reducing foundation pit support cost and construction cost and accelerating the construction, and are particularly suitable for the support of the large-area foundation pits and construction plants of which infrared spaces between subsurface structures and the ground are small.

Description

technical field [0001] The invention relates to a foundation pit supporting device and a construction method, belonging to the technical field of building structure construction, and is especially suitable for the construction of large-area deep foundation pit projects with strict requirements on the surrounding environment. Background technique [0002] With the increasing number of high-rise and super-large space structures, the excavation depth and area of ​​foundation pits are also increasing, and the excavated underground space can be used as garages, storage, shopping malls, and civil air defense projects. After the foundation pit of the building is excavated, it is necessary to make a supporting structure around it to prevent local or large-scale landslides. [0003] For the traditional foundation pit support technology, for the poor soil quality of the foundation pit, the excavation of the foundation pit is relatively deep, especially when the plane size of the foun...

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Problems solved by technology

[0003] For the traditional foundation pit support technology, if the soil quality of the foundation pit is poor and the excavation of the foundation pit is relatively deep, especially when the plane size of the foundation pit is relatively large, if the form of cast-in-situ pile + concrete internal support is adopted as usual, the support will appear The cost of protective measures is relatively high, and the construction period is relatively long

[0004] For the SMW construction method pile in the prior art, its construction is convenient, there is no mud retaining wall, and the pollution to the environment is small. After the construction of the basement is completed, the section steel can be recycled, which reduces the cost of support, but this method has certain negative effects on the construction progress. Influence, at the same time, the effect on the stability of the slope and the safety of the foundation pit is slightly worse

[0005] For the method of replacing large-area concrete horizontal supports with oblique steel pipe supports, it has a significant positive impact on project cost and construction progress, and the use of anchor (pipe) technology also plays a role in the stability of the slope and the safety of the foundation pit. To positive effect, but using this method has certain pollution to the environment

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