Structure for supporting and crossing of water-stop curtain through old bottom plate obstacle, and construction method of structure

Abstract

The invention relates to a structure for supporting and crossing of a water-stop curtain through an old bottom plate obstacle, and a construction method of the structure. The structure comprises the basement bottom plate obstacle, a cement stirring occlusive soldier pile, a grouting soldier pile and a high-pressure jet grouting pile. A mode of 'cement stirring-existing old basement bottom plate obstacle-high-pressure jet grouting' is adopted to form a deep stirring and jetting water-stop curtain comprehensive body, the problem that as for a conventional deep foundation pit support water-stop curtain construction method, the large-thickness old basement bottom plate obstacle cannot be crossed can be solved, meanwhile the problem that old buildings are concentrated on the periphery of a construction area, and consequently the upper part is not suitable for directly adopting high-pressure jet grouting for pile forming is solved, and the structure is suitable for terrain working conditionswith complex sites.

Description

technical field [0001] The invention relates to the technical field of building construction, in particular to a structure and a construction method for a support and water-stop curtain passing through old floor obstacles. Background technique [0002] With the rapid development of the economy, there are more and more old city reconstruction projects in dense building complexes. The construction of the deep foundation pit support structure of this type of project may encounter a deep old basement floor with a thickness of 1 to 2 meters. It is difficult for conventional construction techniques to directly pass through the barriers of the old basement floor to form cast-in-place piles, and it is also impossible to directly use high-pressure rotary grouting pile machines or The mixer pile driver penetrates the old basement floor to form a water-stop curtain. And because of the history of extensive construction by the demolition team, after the main components such as the basem...

AI Technical Summary

Problems solved by technology

The construction of the deep foundation pit support structure of this type of project may encounter a deep old basement floor with a thickness of 1 to 2 meters. It is difficult for conventional construction techniques to directly pass through the barriers of the old basement floor to form cast-in-place piles, and it is also impossible to directly use high-pressure rotary grouting pile machines or Mixer pile driver penetrates old basement floor to form water-stop curtain

And because of the history of extensive construction by the demolition team, after the main components such as the basement roof and middle floor were removed, the miscellaneous soil was quickly backfilled to form a deep and thick layer of loose miscellaneous filling, so that it was difficult to form a mud retaining wall on the upper soil of the old basement floor; Due to the large thickness of the old floor, the soil below the old basement floor is prone to form a confined water layer, which is also not conducive to the formation of mud retaining walls

In addition, such demolition projects are often surrounded by dense old buildings. During the construction of the deep foundation pit support structure, if the upper part is constructed with high-pressure rotary grouting, the soil will be squeezed, which will affect the foundation of the surrounding old houses.

[0003] The above special underground working conditions are not conducive to the construction of the new deep foundation pit bored pile support structure, and are also not conducive to the construction of the new deep foundation pit water-stop curtain

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