Foundation pit support construction method combining horizontal rotary jet-grouting soil bolting and bore concrete piles

A technology of horizontal rotary spraying and cast-in-place piles, which is used in foundation structure engineering, sheet pile walls, excavation, etc., can solve the problems of large amount of concrete supporting materials, increased support removal, support replacement technology, and increased deformation of foundation pit side walls. , to achieve good social and economic benefits, convenient construction, and little space.

CN102518135AActive Publication Date: 2012-06-27BIAOLI CONSTR GROUP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2012-06-27

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Abstract

The invention belongs to the technical field of foundation pit supporting for high-rise buildings, in particular to a foundation pit support construction method combining horizontal rotary jet-grouting soil bolting and bore concrete piles, which includes steps: firstly, constructing water-stop mixed piles and bored concrete piles according to a preset foundation pit; and secondly, performing soil excavation and soil bolting layer by layer and section by section. The foundation pit support construction method has the advantages that the foundation pit support constructed by the method is high in deformation control performance and stability and especially applicable to projections with high requirements on foundation pit deformation, and the method is applicable to mega-area foundation pit supporting in soft soil areas with failure of using internal support structures, limited slope reduction conditions and excavation depth limited within 15m, and meets the requirement that development and utilization of urban underground space continue to develop.
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Description

technical field

[0001] The invention belongs to the technical field of foundation pit support of high-rise buildings, in particular to a construction method for composite foundation pit support of horizontal jet grouting soil anchors and cast-in-place piles. Background technique

[0002] In the southeastern coastal areas of China, with the rapid development of urban construction, high-rise buildings and super high-rise buildings are constantly emerging. Due to the needs of structure and function, one to three-story basements are generally set up. Most of the coastal areas are of soft soil, and their geological structures are generally It is: cultivated soil or miscellaneous filling soil about 1 meter thick on the surface, clay soil 1-2 meters thick below the surface soil, and silt soil or silty soil tens of meters thick below the clay soil. Due to coastal areas, especially offshore areas The soil quality is extremely poor. Generally, foundation pits with a depth of more than...

Examples

Embodiment Construction

[0026] Below in conjunction with accompanying drawing, the present invention will be further described with specific embodiment, see Figure 1-4 ;

[0027] The construction method of horizontal rotary grouting soil anchor and cast-in-situ pile composite foundation pit support includes the following steps:

[0028] (1) According to the preset foundation pit 14, the construction of the water-stop mixing pile (cement mixing pile) 4 is carried out to form a water-stop curtain wall, and the construction of the bored pile 7 is carried out according to the pile position, and the lateral stiffness of the bored pile 7 is Larger, the depth of penetration can be calculated according to the design, which can fully meet the support needs of foundation pits with thick silt layers in coastal areas;

[0029] (2) Carry out earthwork excavation and soil anchor construction according to the principle of layering and segmentation, including the following procedures: ① The earthwork excavation of...