Foundation pit stand column underpinning method
A technology for columns and foundation pits, applied in excavation, foundation structure engineering, construction, etc., can solve problems such as rapid change, deformation damage, brittle damage of reinforced concrete support beams, etc., to achieve fast and safe conversion, reduce uncertainty, and ensure safe effect
Active Publication Date: 2022-03-08
SHENZHEN YJY BUILDING TECH
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Problems solved by technology
[0003] However, due to the characteristics of brittle failure of reinforced concrete support beams, how to determine the size of the lifting force of the jack and how to control the jacking process during the underpinning process, so as to avoid the construction of the supporting beams due to excessive, too small or changing jacking forces. Too fast to cause deformation and failure is the key to the whole column underpinning process
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[0026] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only the technical solutions of the present invention. Some, but not all, embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present invention.
[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describin...
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The invention relates to the technical field of foundation pit engineering construction, and discloses a foundation pit stand column underpinning method. The foundation pit stand column underpinning method comprises the following steps that jacking force of a supporting beam is loaded step by step, and the beam surface displacement of the supporting beam is monitored; if the beam surface displacement of the support beam is greater than the first preset displacement, stopping loading; after each stage of loading is completed, if the beam surface displacement amount of the supporting beam is smaller than a second preset displacement amount and lasts for preset time, next stage of loading is carried out; after step-by-step loading is completed, the loaded jacking force is kept, and the stand columns needing underpinning are dismantled; the jacking force of the supporting beam continues to be loaded, and the beam surface displacement amount of the supporting beam is controlled to be a third preset displacement amount; and if the jacking force loaded by the supporting beam is larger than the preset jacking force value, loading is stopped. According to the invention, the jacking force applied to the jack is controlled, so that the jacking force of the jack does not exceed the bearing capacity of the supporting beam, and the uncertainty of the stress of the fulcrum in the stand column underpinning process is reduced to the greatest extent.
Description
technical field [0001] The invention relates to the technical field of foundation pit engineering construction, in particular to a method for underpinning foundation pit columns. Background technique [0002] Foundation pit engineering is a project that excavates an underground space from the ground to create conditions for the implementation of underground engineering. In order to ensure the stability and safety of the pit wall during underground engineering construction, various types of retaining (support) structures are usually used in foundation pit engineering, such as support piles, anchor cables, soil nails, internal supports, etc. With the development of urban underground space, the surrounding environment of the foundation pit is becoming more and more complex. In the selection of support structure, the support form of "enclosure structure + internal support" which has the least impact on the surrounding environment is usually selected. This support form Columns a...
Claims
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IPC IPC(8): E02D17/04
CPCE02D17/04
Inventor 黄致兴马卓张俊吴旭君姜晓光徐鑫宇朴云逸
Owner SHENZHEN YJY BUILDING TECH