Active underpinning system of bridge pile foundation based on load servo and construction method thereof

Abstract

The invention relates to an active underpinning system of a bridge pile foundation based on load servo and a construction method thereof. The system comprises an existing abutment needed to underpin aload and a plurality of existing pile foundations below the abutment, wherein a newly built tunnel has conflict with the existing pile foundations; underpinning pile foundations are applied to the outer sides of the existing pile foundations, an underpinning bearing platform is applied to the tops of the underpinning pile foundations; the underpinning bearing platform is located below the existing abutment and a plurality of load servo pedestals with active loading functions are arranged between the top surface of the underpinning bearing platform and the bottom surface of the existing abutment. The system is simple in process and site operation is facilitated due to quality. Under a circumstance that a newly built underpinning system has vertical compression deformation and deposition distance, vertical loads in a conversion period of a bearing system can be transferred continuously, so that the demand of controlling the vertical displacement of the existing abutment strictly is met.Based on fundamental philosophy of active loading and load servo, the load servo pedestals capable of converting the vertical loads effectively are put forward to meet the demand on controlling settlement deformation strictly in a conversion period of different bearing systems.

Description

technical field [0001] The invention relates to the technical field of underground engineering, in particular to an active underpinning system of bridge pile foundation based on load servo and a construction method thereof. Background technology [0002] With the rapid development of economy, in order to guide the rational layout and orderly development of the city, more and more attention has been paid to providing convenient travel conditions for residents in the central urban area through rail transit, reducing travel costs and realizing green travel and low-carbon lifestyle. However, due to the limitation of subway station location, the protection of important structures is often involved along the rail transit, and the intrusion of existing structure foundation into the scope of tunnel body is becoming more and more common. [0003] In the past, the measures of pile foundation breaking and structure reconstruction were generally adopted for the bridge pile foundation invadin...

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Problems solved by technology

[0003] In the past, within the scope of urban rail transit construction, the bridge pile foundations that invaded the tunnel body were generally adopted to remove the pile foundation and rebuild the structure, which not only affects the construction period, but also has high implementation costs, which is not in line with the construction of a resource-saving and environment-friendly society. the basic needs of

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