Active Supporting Method for Foundation Pit with Inclined Single-row Pile

Abstract

The invention discloses an active inclined single-row pile foundation pit support method. The following steps are adopted: 1) driving support piles inclined into the pit along the inner side of the edge of the foundation pit to the design elevation of the pile bottom to form a single-row support 2) Set a jack on the pile top of each supporting pile; 3) Set a crown beam on the single row of supporting piles, and use the crown beam to connect all The support piles are connected as a whole; 4) Excavate the soil surrounded by a single row of support piles to the design elevation of the pit bottom, and use the jack set in step 2) to apply pressure to the support piles Control expansion force to reduce soil and pile top displacement. The invention uses the jack to actively control the displacement of the inclined single-row piles, which can greatly reduce the displacement of the pile top, reduce the bending moment of the pile body, reduce the engineering cost, increase the excavation depth, and reduce the risk of overturning damage in the foundation pit. possibility.

Description

technical field [0001] The invention relates to a foundation pit support method, in particular to an active inclined single-row pile foundation pit support method. Background technique [0002] Pile row support is one of the most widely used forms of foundation pit support in China. Compared with the underground diaphragm wall, the pile row structure has many advantages such as simple construction technology, low cost, and flexible layout. Pile row support arranged at intervals is suitable for the situation where there is no groundwater or precipitation outside the pit is allowed. It can also be used for weak water-bearing strata when a water-stop curtain is set or a side-by-side continuous wall is formed with other mixed piles. When the excavation of the foundation pit is relatively shallow, the geological conditions are good, and the environmental requirements (especially deformation requirements) are not high, the support form of cantilever piles can be used. The pile r...

AI Technical Summary

Problems solved by technology

[0004] First, the displacement of the top of the pile with the same excavation depth is large, and the internal force is large, which will cause a large deformation of the ground behind the pile and endanger the surrounding environment

[0005] Second, when the strength of the piles is not enough, it is easy to cause the slope protection piles to break and make the foundation pit unstable, and the excavation depth of the foundation pit is small, and overturning damage is easy to occur when the excavation depth is large, so the support structure needs more Large cross section and insertion depth

However, this technology mainly relies on the hydraulic axial force applied by the horizontal support to actively control the deformation of the foundation pit, which takes up a lot of space, is expensive, and is not environmentally friendly or economical.

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