Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

A construction method for synchronous excavation of lower steps and inverted arches in large-section soft rock tunnels

A construction method and tunnel excavation technology, which is applied in tunnels, tunnel linings, earthwork drilling and mining, etc., can solve the problems of excavation support lag, mutual interference, unfavorable surrounding rock deformation, control support structure stability, etc., to ensure stability and construction safety, improve the progress of excavation construction, and avoid mutual interference

Active Publication Date: 2018-11-30
CHINA RAILWAY TUNNEL GROUP CO LTD
View PDF8 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

combined with Figure 1-2 , in the construction scheme of the three-step excavation method, the excavation and initial support of the tunnel inversion generally exist as independent processes, which are not synchronized with the step excavation construction process. Considering the space of the ballast feed channel during the step excavation construction Inverted arch excavation construction and bench excavation construction will inevitably interfere with each other, which will adversely affect the connection of processes and the control of cycle time
[0004] In addition, because the excavation support of the inverted arch lags behind the lower steps, the initial support structure cannot be closed in time to form a ring, which is not conducive to the deformation control of the surrounding rock and the stability of the support structure

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
  • A construction method for synchronous excavation of lower steps and inverted arches in large-section soft rock tunnels
  • A construction method for synchronous excavation of lower steps and inverted arches in large-section soft rock tunnels
  • A construction method for synchronous excavation of lower steps and inverted arches in large-section soft rock tunnels

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The invention relates to a construction method for synchronously excavating lower steps and inverted arches of a large-section soft rock tunnel. The construction of the method can make the initial support concrete structure of the large-section soft rock tunnel form a fast closed loop, which is beneficial to the initial support concrete The stress state of the structure tends to be reasonable as soon as possible, effectively controlling the construction deformation of large-section soft rock tunnels, and ensuring the construction safety of large-section soft rock tunnel excavations. Mutual interference problems, thus effectively improving construction efficiency.

[0027] to combine image 3 , the present invention divides the excavation surface of the tunnel into four parts from top to bottom: the upper step 1, the middle step 2, the lower step 3 and the inverted arch 4. Excavators, simple platforms, arches, and steel mesh sheets are used in the construction method , ...

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 provides a construction method for synchronous excavation of a lower step and an inverted arch of a large-section soft rock tunnel. Synchronous excavation of the lower step and the inverted arch is achieved through nine procedures, construction procedures of a traditional three-step method are simplified, the interference problem caused when the lower step and the inverted arch are synchronously excavated is effectively avoided, a primary support concrete structure of the large-section soft rock tunnel forms a quick closed loop, the stress state of the primary support concrete structure becomes reasonable easily as soon as possible, construction deformation of the large-section soft rock tunnel is effectively controlled, and construction safety of excavation of the large-section soft rock tunnel is guaranteed. Meanwhile, the nine procedures are reasonably linked, the interference problem existing in excavation of the inverted arch and a tunnel face is reduced, accordingly construction efficiency is effectively improved, and excavation construction process of the large-section soft rock tunnel is improved as a whole.

Description

【Technical field】 [0001] The invention belongs to the technical field of tunnel excavation, and in particular relates to a construction method for synchronously excavating lower steps and inverted arches of large-section soft rock tunnels. 【Background technique】 [0002] The three-step excavation method is one of the most common construction methods in tunnel engineering construction at present. It is generally applicable to the construction of weak surrounding rock sections of large-section tunnels with grades IV to V, and auxiliary advance support measures are determined depending on the surrounding rock conditions on site. . [0003] The so-called inverted arch refers to the inverted arch structure set at the bottom of the tunnel in order to improve the stress conditions of the upper support structure of the tunnel. combined with Figure 1-2 , in the construction scheme of the three-step excavation method, the excavation and initial support of the tunnel inversion genera...

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 Patents(China)
IPC IPC(8): E21D9/00E21D11/10
CPCE21D9/00E21D9/006E21D11/105
Inventor 何伟李建华张迅刘明新洪开荣肖红渠刘洪震张帅军吕瑞虎
Owner CHINA RAILWAY TUNNEL GROUP 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
Eureka Blog
Learn More
PatSnap group products