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

A pile foundation and system technology, applied in foundation structure engineering, foundation structure test, construction, etc., can solve problems affecting construction period, high implementation cost, and failure to meet basic needs, etc., to achieve high economic and social benefits, settlement deformation Controllable, broad-spectrum effect

Pending Publication Date: 2020-11-27
CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 structur

Method used

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

Examples

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Embodiment Construction

[0046] The invention will be described in detail below in combination with specific embodiments.

[0047] The invention relates to a bridge pile foundation active underpinning system based on load servo. The system includes an existing abutment 2 requiring load underpinning and several existing pile foundations 1 below it, and the space conflict between the new tunnel 3 and the existing pile foundation 1; The underpinning pile foundation 4 is constructed outside the existing pile foundation 1, and the underpinning pile cap 5 is constructed on the top of the underpinning pile foundation 4; The underpinning cushion cap 5 is located below the existing abutment 2, and a plurality of load servo bases 6 are set between the top surface of the underpinning cushion cap 5 and the bottom surface of the existing abutment 2.

[0048] The load servo base 6 comprises a steel cylinder 7 with an open top, a vertical high-performance compression spring 11 is arranged in the steel cylinder 7, and a ...

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): E02D27/14E02D27/48E02D27/32E02D33/00E21D9/00
CPCE02D27/14E02D27/32E02D27/48E02D33/00E02D2300/0029E21D9/00
Inventor 戴志仁王文彬尹昌国廖晖李谈喻忠吕海军张庆闯赵亚军段剑锋刘彤张毓斌刘新岗王维马琳琳查家宏陈新平黄彦彬李瑞王耀辉孟宪全潘国钢
Owner CHINA RAILWAY FIRST SURVEY & DESIGN INST GRP
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