In-tunnel reverse construction method for mined metro station with oversized cross section based on arch cover method in soft rock area

A technology of super large section and reverse method, applied in underground chambers, shaft linings, tunnel linings, etc., can solve the problems of high investment, long construction period, and many temporary supports, so as to ensure stability, strengthen bearing capacity, and improve construction operations. The effect of the environment

A technology of super large section and reverse method, applied in underground chambers, shaft linings, tunnel linings, etc., can solve the problems of high investment, long construction period, and many temporary supports, so as to ensure stability, strengthen bearing capacity, and improve construction operations. The effect of the environment

CN110735656AActive Publication Date: 2020-01-31JIESHUN RAIL TRAFFIC TECH CHONGQING
3 Cites 6 Cited by

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • In-tunnel reverse construction method for mined metro station with oversized cross section based on arch cover method in soft rock area
  • In-tunnel reverse construction method for mined metro station with oversized cross section based on arch cover method in soft rock area
  • In-tunnel reverse construction method for mined metro station with oversized cross section based on arch cover method in soft rock area

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1, please refer to Figure 1~15 , the present invention provides a kind of inversion method in soft rock area based on the arch cover method in super large cross-section underground excavation station tunnel, comprising the following steps: Step S01, arch excavation and arch foot arch cover construction; during tunnel excavation, It is necessary to complete the excavation of the upper arch first, and complete the construction of the arch cover of the arch foot. The excavation of the arch is excavated by the double side wall pilot pit method. The excavation sequence is as follows: figure 2 As shown, pilot holes are excavated on the left and right sides of the upper part; image 3 As shown, the pilot tunnels are excavated on the left and right sides of the upper part; Figure 4 As shown, the upper, middle and upper pilot pits are excavated; Figure 5 As shown, the upper, middle and lower pilot pits are excavated; Image 6 As shown, the upper waterproof layer i...

Embodiment 2

[0053] Embodiment 2, the present invention also provides a kind of top-down method in the large-section underground excavation station hole based on the arch cover method in the soft rock area. The middle and lower part of the section is vertically divided into two layers according to the length of the station. From top to bottom are the top layer and the bottom layer, and the excavation area of ​​each layer includes the middle hopping area and the two side areas for excavation. The specific excavation method can be found in Example 1; the implementation method is as follows:

[0054] Step S01, arch excavation and arch foot arch cover construction;

[0055] Step S1, complete the excavation of the excavation area of ​​the top layer, and the excavation of the job-hopping area in the middle of the bottom layer; the height ratio of the top layer and the bottom layer is 4:6;

[0056] Step S2, carry out the construction of the local inverted arch, side wall and station hall laminate...

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 an in-tunnel reverse construction method for a mined metro station with an oversized cross section based on an arch cover method in a soft rock area. The method comprises the following steps of S1, excavating excavated areas in a top layer and a middle layer and excavating a slot jumping area in the middle of a bottom layer; S2, carrying out construction of a local invertedarch, a second section side wall and a negative second floor driving plate structure of the station; and S3, finishing full-cross section excavation and constructing a second liner to line residual parts and the negative second floor driving plate structure of the station. The arch cover method is applied to the soft rock area effectively by means of a supporting measure combining permanent and temporary structures and a reinforcing measure of a special part and combining the in-tunnel reverse construction method of the mined tunnel. Excavation on the lower part in the cross section of the tunnel is carried out by middle broaching, and separated areas on two sides are excavated, so that construction organization in an in-tunnel three-dimensional space is achieved. Compared with a conventional tunnel face-based excavation mode, a sufficient operating space is provided for construction.

Description

technical field [0001] The invention relates to the technical field of underground construction engineering, in particular to a top-down method in a soft rock area based on an arch-covering method in a super-large cross-section underground excavation station cave. Background technique [0002] In areas with soft rocks, underground excavation and large-section subway stations are mostly constructed using the double-side-wall pilot pit method. The construction steps are complicated, there are many temporary supports, and the construction efficiency is low. Although the technology is mature, the investment is high and the construction period is long. [0003] The arch-covering method can also be used for underground excavation of large-section stations, but the traditional arch-covering method is generally applied to relatively hard rock or hard rock strata with high compressive strength, mainly utilizing the good self-stabilization ability of the side wall rock strata. In rail...

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
31 Jan 2020
Publication
CN110735656A
IPC
E21D13/02; E21D11/10; E21F16/00
CPC
E21D13/00; E21D11/10; E21F16/00
Inventors
邹光炯; 彭辉