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Tunneling construction method for single-shield dual-mode shield to pass through fracture zone in TBM mode

A single-shield, broken zone technology, applied in mining equipment, tunnels, earthwork drilling and mining, etc., can solve problems such as inability to maintain pressure, over-excavation, and excessive settlement in open excavation, so as to reduce the risk of excavation and ensure stability Effect

Pending Publication Date: 2022-06-28
CHINA RAILWAY 19TH BUREAU GRP RAIL TRANSIT ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the single-shield double-mode (EPB+TBM) shield TBM mode encounters a long-distance crossing of a relatively broken zone during the full-face hard rock excavation process, because all segments are assembled behind the middle shield and there is no drilling hole for advanced grouting conditions, and Open excavation cannot maintain pressure and is prone to risks such as over-excavation, excessive settlement and even collapse

Method used

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  • Tunneling construction method for single-shield dual-mode shield to pass through fracture zone in TBM mode
  • Tunneling construction method for single-shield dual-mode shield to pass through fracture zone in TBM mode
  • Tunneling construction method for single-shield dual-mode shield to pass through fracture zone in TBM mode

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Experimental program
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Effect test

Embodiment 1

[0032] like figure 1 As shown, the single-shield dual-mode shield tunneling construction method in the TBM mode through the crushed zone according to the embodiment of the present invention includes the following steps:

[0033] S1. Set up an advanced grouting platform, and then fix the drilling rig to carry out drilling operations. After the drilling operation technology, inject water and wash the pipes. After washing the pipes, inject the mixed solution of phosphoric acid / water glass, and then carry out grouting operations through the grouting pipe 1. ;

[0034] S2. The drilling depth reaches 12 meters of the cutter head, and the grouting operation is divided into six sections during this process;

[0035] S3. During the grouting operation, the pressure is controlled at 0.6MPa. After the grouting is completed, the grouting reinforcement of the advanced hole is completed, and the steps are repeated to complete the grouting reinforcement of the remaining 3 advanced holes;

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Embodiment 2

[0046] like Image 6 As shown in the comparative example 1, another embodiment of the present invention is: a plurality of groups of connecting ropes 30 are fixed inside the weight ball 22, and a stirring ball is fixed at the end of the connecting rope 30 away from the weight ball 22 31. There are a plurality of groups of spray holes 32 inside the counterweight ball 22; during operation, when the water flow hits the counterweight ball 22, the counterweight ball 22 will move accordingly, and the stirring ball 31 inside the counterweight ball 22 is at this time. Under the action of inertial force, the inside of the counterweight ball 22 is reciprocatingly stirred, thereby hitting the cleaning powder inside the counterweight ball 22, so that the powder can be discharged through the spray hole 32, thereby improving the cleaning effect and facilitating the subsequent grouting.

[0047] Working principle: This construction method determines the location of the broken zone through de...

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Abstract

The invention belongs to the technical field of building construction, and particularly relates to a tunneling construction method for a single-shield dual-mode shield to pass through a broken zone in a TBM (tunnel boring machine) mode, which comprises the following steps of: building an advanced grouting platform, fixing a drilling machine, drilling, injecting water to wash a pipe after the drilling operation technology, injecting a phosphoric acid / water glass mixed solution after the pipe is washed, and carrying out grouting; then grouting operation is conducted through the grouting pipe; the drilling depth is 12 meters from the cutter head, and grouting operation is performed in six sections in the process; the pressure is controlled to be 0.6 MPa in the grouting operation process, and grouting reinforcement of the advance hole is finished after grouting is completed; the position of the fracture zone is determined through detailed exploration and revelation, filling and exploring and advanced geological forecast (TBM (tunnel boring machine)), the soil body of the fracture zone is subjected to grouting reinforcement, and then a tunnel face is subjected to grouting reinforcement through a soil bin partition plate reserved ball valve, so that the stability of surrounding rock of the fracture zone is improved, and the water permeability of the surrounding rock is reduced; the investment cost of multiple modes is reduced, meanwhile, the construction safety is guaranteed, and the tunneling risk and the safety of earth surface buildings (structures) are reduced.

Description

technical field [0001] The invention belongs to the technical field of building construction, in particular to a construction method of tunneling through a crushed zone in a TBM mode with a single shield and dual-mode shield. Background technique [0002] Under normal circumstances, single-mode shield machines have low driving efficiency in extremely hard rock formations, and single-shield or double-shield TBM cannot drive in composite formations. Previously, the two functional modes of earth pressure balance (EPB) and TBM could not coexist at the same time. It takes more than one month for the offline dual-mode TBM to convert the soil pressure and TBM mode in the tunnel, which affects the overall construction period. The emergence of the single-shield EPB+TBM dual-mode shield machine construction method fills the blank of the domestic EPB+TBM dual-mode shield. [0003] In the process of shield tunneling, there are many unpredictable problems, complex and changeable strata ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21D9/00E21D9/06B05B12/08
CPCE21D9/001E21D9/0671B05B12/087
Inventor 马文帅毕洪超刘立男张瑜时春爽
Owner CHINA RAILWAY 19TH BUREAU GRP RAIL TRANSIT ENG