Small-diameter cast-in-place tube pile composite foundation treatment method for permafrost foundation of Qinghai-Tibet highway

A technology for permafrost foundation and composite foundation, which is applied in sheet pile wall, foundation structure engineering, construction, etc., can solve the problem that the thermal thawing subsidence of permafrost foundation is not well solved, and achieves easy quality control, simple construction technology, Actionable effect

Active Publication Date: 2014-04-30
SOUTHEAST UNIV
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judging from existing engineering practices, these engineering measures have achieved some results, but the problem of thermal-thaw subsidence of permafrost foundations has not been well resolved

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
  • Small-diameter cast-in-place tube pile composite foundation treatment method for permafrost foundation of Qinghai-Tibet highway
  • Small-diameter cast-in-place tube pile composite foundation treatment method for permafrost foundation of Qinghai-Tibet highway
  • Small-diameter cast-in-place tube pile composite foundation treatment method for permafrost foundation of Qinghai-Tibet highway

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0035] Such as figure 1 The small-diameter cast-in-place pipe pile machine shown in the steel pipe mold is positioned on the pre-treated permafrost foundation 14, the equipment foundation 1 is fixedly connected with the bottom of the gantry support 2, and the inner side of the gantry support 2 is provided with a chute , the sliding rod 6 is connected with the chute on the gantry bracket, the sliding rod 6 is connected with the rotary machine 4 (with a power source inside), and the lower part of the rotary machine 4 is connected to the steel pipe cavity structure 5 with a diameter of about 50-80 cm and a spiral outside. fixed. Fix the pulley power source 3 on the equipment foundation 1, fix the pulley 7 in the middle of the top of the gantry support 2 and the right end, and the steel wire rope 8 connects the slide bar 6 with the pulley power source 3 through the pulley 7 to realize the up and down movement of the slide bar 6.

[0036] Start the power source of the rotating mac...

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 technology of adopting a small-diameter cast-in-place tube pile composite foundation for treating a permafrost foundation of the Qinghai-Tibet highway, in particular to a specially designed steel tube mold forming small diameter (50 cm-80 cm) cast-in-place tube pile machine. The method includes the steps that steel tube cavity structures are driven into the permafrost foundation in a rotating mode; heat preservation hollow steel protective tubes are driven into holes formed after the steel tube cavity structures are pulled out, then freshly mixed concrete is cast in place, and the steel protective tubes are pulled out after certain strength is reached; a gravel layer and soil engineering grilles are laid at the tops of formed small diameter cast-in-place tube piles. The previous thought of protecting the permafrost foundation passively is broken through, the problems of hot melting and sinking of the permafrost foundation of the Qinghai-Tibet highway are expected to be solved fundamentally, and meanwhile the small diameter cast-in-place tube piles belong to rigid piles, are high in strength, simple in technology and low in cost, and the treatment depth can reach 10 m-30 m.

Description

technical field [0001] The invention relates to a treatment method for the small-diameter (50-80cm) cast-in-place pipe pile composite foundation of the Qinghai-Tibet Highway permafrost foundation, which can solve the thermal-thaw subsidence problem of the permafrost foundation, and belongs to the field of highway engineering construction. Background technique [0002] During the construction of my country's Qinghai-Tibet Highway and Railway, in the 1970s, the design principle of "prefer filling rather than digging" and the minimum subgrade height for permafrost foundations were put forward. The problem of critical height and design height. In the 1990s, the design principle of "protecting permafrost, controlling thawing rate and comprehensive treatment" was put forward, and the critical height of subgrade correction was given. Since 2000, considering the impact of climate change, the principle of "cooling and heat resistance, reducing radiation, enhancing convection, and com...

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
Patent Type & Authority Applications(China)
IPC IPC(8): E02D27/35E02D5/38
Inventor 廖公云邵财泉黄晓明汪双杰陈建兵马涛王声乐
Owner SOUTHEAST UNIV
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