Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Large-section water-rich saturated fine sand railway tunnel excavation method

A technology for tunnel excavation and silty sand, which is applied in tunnels, tunnel linings, drainage, etc., can solve the problems of poor self-stability of silty sand, deterioration in contact with water, and outflow of quicksand, so as to improve construction quality and reduce Construction errors and the effect of ensuring construction safety

Inactive Publication Date: 2014-03-12
CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP
View PDF4 Cites 29 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art, and provide a method for excavating a large-section water-rich and saturated silt-fine sand railway tunnel. Lowering and drainage, well solved the construction technical problems of poor self-stability of silty sand and rapid deterioration when encountering water, showing quicksand gushing out

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
  • Large-section water-rich saturated fine sand railway tunnel excavation method
  • Large-section water-rich saturated fine sand railway tunnel excavation method
  • Large-section water-rich saturated fine sand railway tunnel excavation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] A method for excavating a large-section water-rich saturated silty sand railway tunnel, comprising the following steps:

[0027] 1. A double-side-wall pilot tunnel is constructed ahead of time in the lower half of the main tunnel. The pilot tunnel is excavated in steps, and temporary inverted arches are set up separately, and the sections are closed to form a ring. The specific steps are:

[0028] 1. (1) Use the steel frame erected in the previous circulation to implement the advance support of the tunnel; (2) Excavate a part of the soil; (3) Implement the initial support and temporary support in time, and set up temporary inverted arches Closed into a loop, the steel frame lock foot anchor pipe is installed.

[0029] 2. After the first part is constructed to an appropriate distance, the second part is excavated, the steel frame is extended, and the initial support, side wall and bottom temporary inverted arch are applied to make it closed into a ring.

[0030] 3. As ...

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 large-section water-rich saturated fine sand railway tunnel excavation method. The method includes the following steps that firstly, pilot tunnels of double side walls are constructed in the lower half section of a positive hole of a tunnel in advance and are excavated with sub-steps, temporary inverted arches are arranged on the pilot tunnels respectively, rings are formed in a sealed and segmented mode, and sub-steps are used for carrying out look-ahead dewatering and drainage on the pilot tunnels; secondly, a method that an arc pilot channel is used for reserving core earth is used for excavating the upper section of the positive hole of the tunnel, the core earth is used for stabilizing a tunnel face, arc excavation is performed in place at a time, the positive hole primary supporting steel frame is spliced in place at a time, the temporary inverted arches and a middle partition wall which are next to the tunnel face are constructed to make an upper portion supporting structure form a ring in a sealed mode, the sub-steps are manually cut to excavate the core earth, an overall positive hole primary supporting lagging jack structure is rapidly established, the inverted arches are cast and concrete filling can be carried out in time; thirdly, a result is analyzed according to monitoring measurement data, the inner side wall in the hole, the temporary inverted arches and the middle partition wall are detached in a segmented mode and a composite lining is constructed in time. By means of the method, the construction problem that the self stability of the fine sand is poor and the fine sand rapidly deteriorates when encountering water and surges outwards like quicksand is solved.

Description

Technical field: [0001] The invention belongs to the technical field of tunnel engineering construction, and in particular relates to an excavation method for a large-section water-rich saturated silty-fine sand railway tunnel. Background technique: [0002] The geological conditions of water-rich and saturated silt-fine sand strata determine the particularity of tunnel construction. At present, it is rare to build tunnels in water-rich and saturated silt-fine sand stratum in China, and there is no corresponding construction experience for reference. Tunnel construction in weak surrounding rock strata generally adopts the middle partition method (CD method), the cross middle partition method (CRD method) and the double-side wall pilot pit method. Based on the construction principles of strict grouting, early closure, frequent measurement, and lining follow-up", drawing on the traditional forming method and organizing relevant experts to discuss and study, it was first decide...

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): E21D9/00E21F16/02E21D11/18E21D11/10
Inventor 李素清赵旭鹏张学文刘绍石王平王锋
Owner CHINA RAILWAY CONSTR BRIDGE ENG BUREAU GRP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com