Structure of prefabricated pile-plate brackets for underpinning existing pile foundations through shield tunneling and construction method

A construction method and prefabricated pile technology, which is applied in foundation structure engineering, foundation structure repair, earthwork drilling and mining, etc., can solve the problem of inability to effectively prevent the settlement of new slab foundations, the high risk of direct pile cutting by shield tunneling, and the inability of valve plate foundations. Good application and other issues, to achieve the effect of preventing settlement, shortening the construction period and saving costs

Inactive Publication Date: 2016-06-15
JINAN RAILWAY TRANSPORT GRP CO LTD
View PDF7 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Chinese patent CN101936167B discloses a construction method for bridge underpinning combined with shield construction to pass through bridge pile foundations. Before shield tunnel crossing construction, the pile foundation of the bridge is replaced with an enlarged slab foundation, and the bottom plate of the enlarged foundation is The soil foundation has been reinforced. When the surrounding layer of the existing pile foundation is soft soil and the soft soil layer is thick, the depth of foundation reinforcement will inevitably increase, resulting in an increase in project cost, and the settlement of the new slab foundation cannot be effectively prevented.
[0004] Chinese patent CN101761068A discloses a box-raft pressure-bearing foundation underpinning and con

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Structure of prefabricated pile-plate brackets for underpinning existing pile foundations through shield tunneling and construction method
  • Structure of prefabricated pile-plate brackets for underpinning existing pile foundations through shield tunneling and construction method
  • Structure of prefabricated pile-plate brackets for underpinning existing pile foundations through shield tunneling and construction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] A prefabricated pile-slab foundation underpinning in which shield tunneling passes through an existing pile foundation, including four prefabricated piles 5 laid around the existing pile 3 foundation and pouring together with the existing cap 2 and the existing pile 3 foundation The conversion layer 6; the prefabricated pile 5 is set on the outside of the existing pile 3, and the prefabricated pile is set at a certain distance outside the existing pile to ensure that it does not extend into the excavation range of the shield machine and is separated from the shield machine. Keep a certain safe distance in the digging range.

[0056] The prefabricated pile 5 has reserved steel bars at the top of the pile, and the reserved steel bars at the top of the pile are welded as a whole with the reinforcement cage of the conversion layer 6, and the reinforcement cage of the conversion layer 6 is also connected with the existing cap 2 and the existing pile 3 The planting bars are w...

Embodiment 2

[0059] A prefabricated pile-slab foundation underpinning construction method in which the shield tunnel passes through the existing pile foundation, comprising the following steps:

[0060] (1) Prefabrication of prefabricated piles 5 outside the construction site

[0061] The prefabrication steps of the prefabricated pile 5 are as follows: making the formwork of the prefabricated pile 5, binding the reinforcement cage, reserving the steel bar connected with the transfer layer 6 reinforcement cage at the top of the prefabricated pile 5, pouring the concrete pile body, curing, and removing the formwork;

[0062] (2) Excavate the foundation pit around the existing pier 1, and press the prefabricated pile 5 into the position required by the design

[0063] (1) Excavate the foundation pit on a small slope around the existing pile 3 to the design depth, level the bottom of the foundation pit, and carry out foundation pit support;

[0064] (2) Use a pile driver to press the prefabri...

Embodiment 3

[0074] Preferably, when the deformation requirements of the existing structure are extremely strict, the jack can be used to compensate the deformation of the existing structure. Another scheme for the underpinning of the prefabricated pile-slab foundation where the shield passes through the existing pile foundation is:

[0075] It includes 4 prefabricated piles 5 driven around the existing pile foundation and the transfer layer 6 poured together with the existing cap 2 and the existing pile 3 foundation, and is placed between the existing cap 2 and the transfer layer 6 4 jacks 7; the prefabricated pile 5 is set on the outside of the existing pile; the pile top of the prefabricated pile 5 has reserved steel bars, and the reserved steel bars at the top of the pile are welded as a whole with the reinforcement cage of the transfer layer. The reinforcement cage of the conversion layer is also welded and connected with the existing cap and the reinforcement of the existing pile; th...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a structure of prefabricated pile-plate brackets for underpinning existing pile foundations through shield tunneling and a construction method. The structure of the prefabricated pile-plate brackets for underpinning the existing pile foundations through shield tunneling and the construction method are especially suitable for underpinning of the existing pile foundations low in foundation bearing capacity but high in requirement on deformation of upper structures. Prefabricated parts are adopted for piles in the structure, and therefore the construction period is greatly shortened, and the quality of the parts can be guaranteed.

Description

technical field [0001] The invention belongs to the technical field of geotechnical and underground engineering, and in particular relates to a prefabricated pile-slab underpinning structure and construction method in which a shield passes through an existing pile foundation, and is especially suitable for when the bearing capacity of the foundation is insufficient and the deformation of the superstructure is strictly required The existing pile foundation underpinning and its. Background technique [0002] The establishment of urban underground transportation system plays a vital role in alleviating the increasingly tense urban traffic congestion. In January 2015, the National Development and Reform Commission officially approved the short-term construction plan of Jinan's rail transit. So far, China has spent more than 50 years to make all municipalities and sub-provincial cities have a relationship with the subway. However, with the continuous improvement of the urban rai...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): E02D27/48E02D37/00E21D9/06
CPCE02D27/48E02D37/00E21D9/06
Inventor 王国富秦世朋曹正龙韩林
Owner JINAN RAILWAY TRANSPORT GRP CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap