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Method for reinforcing existing pile foundation in collapsed loess area by slip casting

A technology of collapsible loess and grouting reinforcement, which is applied in the repair of foundation structures, sheet pile walls, foundation structure engineering, etc. Effect

Inactive Publication Date: 2012-09-26
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

At present, there is no unified method, and each reinforcement method has a certain scope of application, and the construction technology and reinforcement cost are also very different.

Method used

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  • Method for reinforcing existing pile foundation in collapsed loess area by slip casting
  • Method for reinforcing existing pile foundation in collapsed loess area by slip casting
  • Method for reinforcing existing pile foundation in collapsed loess area by slip casting

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Embodiment Construction

[0019] As a grouting process with strong adaptability, the one-way valve pipe grouting method is currently widely used in subway projects. It has the characteristics of sequential, segmental, fixed depth, quantitative, intermittent, and repeated grouting, and The one-way valve pipe grouting method is simple and fast in construction, and the construction difficulty is low. The construction equipment can be carried out in a narrow space, the construction period is short, and the impact on the surrounding environment is also small. The applicant cited it in the pile foundation reinforcement. These characteristics can be fully utilized, and it can reduce the negative friction of the pile body caused by the collapsibility of the soil around the pile foundation in the collapsible loess area, and has a better effect on the reinforcement of the pile foundation. A new pile foundation reinforcement method in the area to meet the needs of existing reinforcement works.

[0020] This examp...

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Abstract

The invention discloses a method for reinforcing an existing pile foundation in a collapsed loess area by slip casting. The method is a method required for reinforcement of a checking valve pipe of the existing pipe foundation adjacent to an underground project during construction. In the method, checking valve pipe slip casting is adopted as a main reinforcing technical measure; and the method comprises the following steps of: distributing slip casting hole positions on a pile foundation bearing table and at the periphery of the pile foundation bearing table within a certain range; after a driller finishes drilling, installing a checking valve pipe; filling a prepared shell material into an annular space between the checking valve pipe and the wall of the drilled hole; when the shell material reaches certain strength, reinforcing the soil at the periphery of the pile foundation by slip casting; after slip casting, covering a slip casting protective cover; and performing slip casting at any time as required. By the reinforcing method, a pile body negative friction force of the soil body at the periphery of the pile foundation in the collapsed loess area due to collapsibility can be reduced, the bearing capacity of the pile foundation is enhanced, the settlement of the pile foundation due to the underground project construction is decreased, and an aim of reinforcing by slip casting is fulfilled.

Description

technical field [0001] The invention relates to the field of reinforcement of existing building pile foundations, in particular to a method for grouting reinforcement of existing pile foundations in collapsible loess areas. Background technique [0002] Due to the construction of underground projects, it is often necessary to reinforce the existing pile foundations of adjacent projects. At present, the pile foundation reinforcement methods commonly used at home and abroad include composite grouting method, rotary grouting pile method, anchor static pressure pile method, and cement powder spray pile method. law etc. At present, there is no unified method, and each reinforcement method has a certain scope of application, and the construction technology and reinforcement cost are also very different. Contents of the invention [0003] Combining the advantages and disadvantages of existing pile foundation reinforcement methods, the purpose of the present invention is to provi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D27/34E02D5/62E02D37/00
Inventor 胡长明程佳佳林源梅源崔耀贡少瑞
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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