Building foundation pit supporting construction

Abstract

The invention discloses a foundation pit support structure of buildings which comprises a soil nailing wall surrounding a foundation pit and a prestressed anchor rod which is inserted into the soil body by the soil nailing wall. The invention is characterized in that the pier column structure is arranged on the soil nailing wall every 5 meters to 10 meters; wherein, the pier column structure comprises a filling pile group which is perpendicular to the bottom of the foundation pit, the prestressed anchor rod at the two sides of the filling pile group and a level channel steel which is connected with the anchor rod at the two sides and is arranged at the outside terminal of the soil nailing wall; the filling pile group is packed in the soil nailing wall and consists of at least two filling piles in homogeneous alignment. The invention makes use of the pier column structure to divide the large-area foundation pits into small-area foundation pits; the combination of a filling pile, a prestressed anchor rod and the soil nailing wall raises the ability of the pit support in anti-deforming and anti-displacement and realizes the supporting to the foundation pit; besides, the construction cost is just 60 percent of rigid perfusion row piles.

Description

technical field [0001] The invention relates to a foundation engineering in building construction, in particular to a foundation pit supporting structure used when excavating a basement foundation pit. Background technique [0002] With more and more high-rise buildings, the depth of the foundation pit is also increasing, and the excavated underground space can be used as garages, storage, shopping malls, civil air defense projects, etc. After the excavation of the foundation pit of the building, it is necessary to make a support structure around it to prevent local or large-scale landslides. [0003] There are two types of existing support structures commonly used: one is a cantilever type or pile (wall) anchor type soil retaining structure embedded below the ground around the foundation pit, which is composed of steel sheet piles or arranged concrete piles (cast-in-situ piles) The other type is the soil nail wall structure, which utilizes the friction and cohesion between...

AI Technical Summary

Problems solved by technology

[0007] As mentioned above, the support structure of cast-in-place piles has high safety and is suitable for deep foundation pits, but the engineering cost is high and the construction period is long; while the support structure of soil-nailed walls has the advantage of low engineering cost, but The safety of the foundation pit cannot be guaranteed (the displacement and deformation of the long side are large, and the lateral stiffness is relatively small), and it is generally only suitable for the support of the second and third-level foundation pits below 10 meters

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