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Deep foundation pit support process

A deep foundation pit support and deep foundation pit technology, which is applied in the direction of foundation structure engineering, sheet pile walls, excavation, etc., can solve the problems of unsatisfactory reinforcement effect of weak soil, impossible construction, limited anchoring force, etc., to reduce the underground Effects of space resource pollution, fast construction speed, saving materials and labor

Active Publication Date: 2010-10-20
JIANGSU JIANGZHONG GROUP
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Problems solved by technology

Therefore, the reinforcement effect on soft soil is not ideal; second: the anchor rod or soil nail is bonded to the soil through the grout of grouting, and the anchoring force produced is limited; third: for soft soil, especially silt Soil, silt, the anchoring force between conventional anchor cables, anchor rods and soft soil is very limited, and there are shortcomings such as failure of construction due to collapsed holes

Method used

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Embodiment Construction

[0032] Effect analysis of the application of multi-directional rotary jet mixing and stiffening combined pile support technology in the Yufeng Square foundation pit project:

[0033] First of all, the general situation of the project and the surrounding environment are as follows: Yufeng Plaza is located on the south side of Qingnian Middle Road in Nantong City, adjacent to Nantong Third People’s Hospital in the west, Limin Building, Sande Hotel and Buildings 1# and 2# of Chengnan New Village in the south. The location is Duanjiaba Vegetable Market. The building is mainly composed of a 27-story high-rise building, a three-story podium building and a two-story basement. The first floor is an underground shopping mall, and the second floor is a parking garage and equipment floor. The structure of the high-rise building is a shear wall structure, and the highest point of the building is about 98 meters. The estimated standard value of the maximum column foot angle internal force...

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Abstract

The invention relates to a deep foundation pit support process. A cement-soil reducing pile body is formed in a deep foundation pit soil layer by using a rotary jet stirring method, and a steel strand or an anchorage rib like a steel bar or a profile steel is inserted into the cement-soil reducing pile body to form a multidirectional rotary jet stirring stiffening combined pile for reinforcing and supporting foundation soil or side slopes. The process is characterized in that the support of the multidirectional rotary jet stirring stiffening combined pile in the deep foundation pit mainly comprises support forms of a vertical rotary jet stirring stiffening pile and a multidirectional rotary jet stirring stiffening expanded oblique pile; and the bottom is reinforced by adopting a bottom rotary jet stirring stiffening submerged pier pile. The process lowers the construction cost, enhances enterprise competition, can adapt to the requirements of building a conservation-minded society and developing cyclic economy, reduces underground space resource pollution and is favorable for environmental protection at the same time.

Description

technical field [0001] The invention relates to a support technology for underground foundation pits in the field of construction, in particular to forming cement-soil variable-diameter piles in the soil layer of deep foundation pits by using the rotary jet mixing method, and inserting steel strands or steel bars, shaped steel and the like The anchor bar is made into a multi-directional jet-jet mixing and stiffening composite pile, which is used to reinforce and support the foundation soil or the deep foundation pit support technology of the slope. Background technique [0002] At present, the support of deep foundation pit support has the structural form of anchor rod and soil nail. The disadvantages of these two structural forms are as follows: [0003] First of all, the anchor rod and soil nail are bonded to the soil through low-pressure grouting, and the amount of grout injected into the soil is small and the diffusion is disordered. Therefore, the reinforcement effect ...

Claims

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Application Information

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IPC IPC(8): E02D17/02E02D17/04E02D5/50E02D7/02E02D5/46
Inventor 沈良兵沈岳沈世祥江林沈永龙
Owner JIANGSU JIANGZHONG GROUP
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