Underpinning beam jacking method in pile foundation underpinning construction
A technology of pile foundation underpinning and beam underpinning, which is applied in the direction of foundation structure engineering, construction, etc., to achieve the effects of preventing deformation, easy adjustment and control, and improving operability
Inactive Publication Date: 2021-02-26
CHINA RAILWAY NO 5 ENG GRP +2
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art, to provide an underpinning beam that can effectively prevent deformation, displacement, and cracks, avoid overloading, and improve operability, jacking accuracy, and jacking. Underpinning beam jacking method in pile foundation underpinning construction for improving quality and construction safety
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[0020] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0021] Such as figure 1 As shown, the underpinning beam jacking method in the pile foundation underpinning construction of the present embodiment comprises the following steps:
[0022] (A) After the construction of the underpinning beam connecting the original piles and multiple underpinning piles is completed, multiple jacks are installed between each underpinning pile and the underpinning beam;
[0023] (B) By controlling the jacking force of each jack, the underpinning beam is lifted by loading multiple times and successively, that is, the jacking beam is gradually loaded multiple times until the preset design jacking force is reached. The jacking force in the latter jacking is greater than that in the previous jacking, and the jacking forces of all jacks are the same in each jacking.
[0024] The underpinning beam jacking metho...
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The invention discloses an underpinning beam jacking method in pile foundation underpinning construction. The underpinning beam jacking method comprises the steps that a plurality of jacks are arranged between an underpinning pile and an underpinning beam; and then the underpinning beam is jacked in a multi-time and successive loading mode by controlling the jacking force of all the jacks till thepreset designed jacking force is achieved, the jacking force of all the jacks in the next jacking process is larger than the jacking force of all the jacks in the previous jacking process, and the jacking force of all the jacks in each jacking process is the same. By the adoption of the underpinning beam jacking method, deformation, displacement and cracks of the underpinning beam can be effectively prevented, the overload problem is avoided, and operability, jacking accuracy, jacking quality and construction safety can be improved.
Description
technical field [0001] The invention relates to the technical field of civil engineering construction, in particular to an underpinning beam jacking method in pile foundation underpinning construction. Background technique [0002] With the vigorous development of urban construction, urban ground traffic is becoming more and more busy. In order to alleviate the pressure of ground traffic, building convenient and fast underground railways has become the choice of many urban traffic. Due to the fact that the construction of the underground railway has little impact on the ground traffic, and with the maturity of the construction method of the underground excavation, the underground excavation method has become the main construction method of the urban underground railway construction at present, but it will inevitably pass through the ground buildings, which requires the use of piles. The foundation underpinning technology underpins the pile foundation of the ground building d...
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IPC IPC(8): E02D27/48E02D27/14E02D15/00
CPCE02D15/00E02D27/14E02D27/48
Inventor 杨飞历彦军林晓寒彭祖民王志兵黄欣昊
Owner CHINA RAILWAY NO 5 ENG GRP