Muddy water/soil pressure dual-mode shield and driving mode conversion method thereof

A mode conversion and dual-mode technology, applied in the direction of earth drilling, mining equipment, tunnels, etc., can solve the problems of unstable pressure in soil bunkers, achieve the effect of preventing pressure fluctuations in soil bunkers, preventing pipeline blockage, and maintaining stability

Active Publication Date: 2020-06-02
CHINA RAILWAY TUNNEL GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to provide a mud-water/earth pressure dual-mode shield excavation mode conversion method,

Method used

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  • Muddy water/soil pressure dual-mode shield and driving mode conversion method thereof
  • Muddy water/soil pressure dual-mode shield and driving mode conversion method thereof
  • Muddy water/soil pressure dual-mode shield and driving mode conversion method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0052] Example 1:

[0053] A mud-water / earth-pressure dual-mode shield, see figure 1 and image 3 .

[0054] The mud-water / earth pressure dual-mode shield provided by the embodiment of the present invention is equipped with all the systems required by the earth pressure and mud-water excavation modes, and does not require any dismantling and installation work during mode conversion.

[0055] Specifically, as figure 1 and image 3 As shown, the front end of the shield is provided with a cutter head 11, the interior of the shield is provided with an earth bin 12 and an air cushion bin 13, and a pipeline system 2 and a screw machine 3 are also provided. The piping system 2 includes the slurry feeding pipe, the slurry discharging pipe, the bypass pipe, the backwashing pipe and other pipes used in various working modes, as well as the slurry feeding pump and the slurry discharging pump. It can also be used to inject bentonite or foaming agent during the excavation in the earth...

Example Embodiment

[0058] Example 2:

[0059] A mud-water / earth-pressure dual-mode shield tunneling mode conversion method, please refer to Figure 1 to Figure 7 .

[0060] In the mud-water / earth pressure dual-mode shield tunneling mode conversion method provided by the embodiment of the present invention, according to the hydrogeological conditions and surrounding environmental factors on the construction route, the advantages and disadvantages of the mud-water mode and the earth pressure mode are balanced, and an appropriate mode is selected. Change location.

[0061] like figure 2 As shown, the mud-water / earth pressure dual-mode shield tunneling mode conversion method provided by the embodiment of the present invention includes a conversion process from mud-water mode to earth pressure mode, and specifically includes:

[0062] Step S110 , when the driving mileage reaches the position where the mud-water mode is converted to the earth pressure mode, the driving is stopped, and the supporti...

Example Embodiment

[0102] Project example:

[0103] see Figure 8 In a city, the subway crossing the river tunnel adopts shield construction, and the tunnel line from platform 41 on the left bank of the river to platform 43 on the right bank of the river needs to pass through the bottom of the river bed where the river water 42 is located. After on-site analysis and geological measurement, there are many old buildings above the first line section 44 and the third line section 46. It is necessary to accurately control the rock and soil settlement above to prevent the safety of the buildings from being affected. The mud-water balance mode has advantages; the second line section 45 is the stage of crossing the river bed. The bottom of the river bed is a full-section mudstone stratum. The mudstone is relatively stable. The mud-water balance mode is inefficient, while the earth pressure balance mode has high efficiency and low energy consumption.

[0104] Therefore, considering comprehensively, the ...

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Abstract

The invention discloses a muddy water/soil pressure dual-mode shield and a driving mode conversion method thereof. The muddy water/soil pressure dual-mode shield is provided with devices and supporting equipment required for driving in a muddy water mode and a soil pressure mode, and can adopt muddy water and soil pressure dual modes for driving. During converting of the muddy water mode into thesoil pressure mode, after a bypass mud pipeline and a communicating pipe are closed, the pressure changes of a soil bin and an air cushion bin are observed, and then whether conversion can be carriedout or not is judged, so that the stable pressure of the soil bin in the conversion process is ensured advantageously; and in the reverse flow mud discharging process, the mud discharging speed can becontrolled through a mud discharging pump and is matched with the driving speed of the shield, and thus the stable pressure in the soil bin can be actively maintained. During converting of the soil pressure mode into the muddy water mode, a part of muck is discharged through a screw conveyor firstly, and the screw conveyor discharges the muck quickly, so that the conversion efficiency is improvedadvantageously; and reserved muck is subjected to muck-mud replacement through a back-washing mode so that the situation that gushing appears when the screw conveyor discharges the remaining small amount of muck, and consequently, the pressure of the soil bin loses stability can be prevented.

Description

technical field [0001] The invention relates to the technical field of shield construction, in particular to a mud-water / earth pressure dual-mode shield and a tunneling mode conversion method thereof. Background technique [0002] In the process of shield type selection for tunnels using shield construction, mud-water balance shield or earth pressure balance shield is generally selected according to the balance of advantages and disadvantages of hydrogeological conditions and surrounding environmental factors. [0003] The pressure in the mud water tank of the mud water balance shield is precisely controlled, and it has advantages in construction safety and settlement control in the face of complex surrounding areas or tunnels with poor hydrogeological conditions; its disadvantage is that there are many supporting equipment, high site conditions, and high excavation costs. The earth pressure balance shield is high. The pressure control accuracy of the earth pressure balance...

Claims

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Application Information

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IPC IPC(8): E21D9/06E21D9/12E21D9/13
CPCE21D9/06E21D9/124E21D9/13
Inventor 徐敬贺左龙孟鑑先方东洋贾少东张挺浮敏
Owner CHINA RAILWAY TUNNEL GROUP CO LTD
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