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Harmful gas treatment device used for earth pressure balance shield and treatment method

An earth pressure balance shield and harmful gas technology, applied in mining equipment, measuring equipment, earthwork drilling and mining, etc., can solve the problems of no explosion protection, gas explosion, etc., and achieve the effect of ensuring safety and good detection effect

Pending Publication Date: 2019-11-26
POWERCHINA RAILWAY CONSTR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The key point is that if the gas concentration reaches the slag outlet of the screw conveyor together with the improved muck and there are a large number of electrical equipment without explosion-proof functions nearby, it is easy to cause a gas explosion.

Method used

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  • Harmful gas treatment device used for earth pressure balance shield and treatment method
  • Harmful gas treatment device used for earth pressure balance shield and treatment method
  • Harmful gas treatment device used for earth pressure balance shield and treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Such as figure 1 and figure 2 As shown, the earth pressure balance shield includes a cutter head 1, a front shield 3, a middle shield 6, a shield tail 9, an assembly machine 10, a propulsion cylinder 7, a segment 12, and a belt conveyor arranged under the slag outlet 16 of the screw conveyor 17, etc., a harmful gas treatment device for earth pressure balance shield tunneling of the present invention, including a gas detection device, the gas detection device includes a filter screen, a water inlet pipe 22, a first valve 23, a second valve 24, and a storage box 26 , a gas sensor and a third valve 31;

[0033] The front end of the connecting pipeline is provided with a strainer, and the connecting pipeline is communicated with the water inlet pipe 22; the first valve 23 is set on the water inlet pipe 22, the second valve 24 is set on the connecting pipeline, and the connecting pipeline is connected with the storage box 26; the storage box 26 The bottom is connected wit...

Embodiment 2

[0039] During the construction of the earth pressure balance shield, the main positions where gas and other harmful gases enter the tunnel are: screw conveyor slag outlet 16, hinge seal 8, shield tail seal 11, and segment joint 13. Hinged seal 8, shield tail 9 seal, and segment joint 13 all adopt sealing devices, and under the premise that the sealing devices are not damaged, the permeation amount of gas and other harmful gases can basically be ignored. Therefore, the screw conveyor 14, especially its slag outlet, is likely to carry a large amount of harmful gas, such as gas, along with the output of the slag. In addition, in the soil chamber 2 of the shield machine, a large amount of mixed gas tends to exist in the upper part of the soil chamber 2 . Aiming at this phenomenon, the present invention optimizes the detection position.

[0040] The gas detection device comprises a first gas detection device 4 and a second gas detection device 18 with the same structure, that is, ...

Embodiment 3

[0042] For the first gas detection device 4 and the second gas detection device 18, the following settings have also been made:

[0043] The connecting pipeline is connected with the top of the storage box 26, and the gravity of the medium is used to form natural stratification. The heavier medium such as muddy water sinks to the bottom of the storage box 26, and the mixed gas naturally floats on the top of the storage box 26. The inlet of the detection pipeline is also arranged on the upper part of the storage box 26 to facilitate the mixed gas to enter the detection pipeline.

[0044] A first cut-off valve 21 is arranged on the connecting pipeline, and the first shut-off valve 21 is close to the earth compartment partition 32 of the earth pressure balance shield, and is located before the connection node between the connecting pipeline and the water inlet pipe 22 .

[0045] The second valve 24 is located close to the storage tank 26 and after the connection node of the conne...

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Abstract

The invention discloses a harmful gas treatment device used for earth pressure balance shield and a treatment method. The treatment device comprises a gas detection device, the gas detection device comprises a filter net, a water inlet pipe, a first valve, a second valve, a storage box, a gas sensor and a third valve, the filter net is arranged on the front end of a connecting pipeline, the connecting pipeline communicates with the water inlet pipe, the first valve is arranged on the water inlet pipe, the second valve is arranged on the connecting pipeline, the connecting pipeline is connectedwith the storage box, the water outlet pipe is connected to the bottom of the storage box, the third valve is arranged on the water outlet pipe, the storage box is further connected with the gas sensor and a detection pipeline, harmful gas can be detected, and construction safety is ensured; the filter net can block the soil particles outside, only water and gas enter the storage box, and the filter effect is achieved; and the storage box is arranged, the buffer effect is achieved, only gas can enter the gas sensor, the good detection effect is ensured, the water outlet pipe is arranged on the bottom of the storage box, and the water and other media can be discharged.

Description

technical field [0001] The invention relates to the field of tunnel construction, in particular to a harmful gas processing device and processing method for earth pressure balance shield tunneling, capable of detecting harmful gas. Background technique [0002] Earth pressure balance shields are widely used in tunnel construction due to their small footprint, fast construction progress, low equipment cost, and high safety, and they tend to completely replace traditional underground excavation tunnels. During the construction of the earth pressure balance shield, due to the complex underground environment, there are often harmful gases such as carbon monoxide, carbon dioxide, hydrogen sulfide, and gas. Although there are currently detection methods for these harmful gases, they are not combined with the earth pressure balance shield. Therefore, it is unavoidable to be affected by harmful gases, especially gas, during the shield tunneling process. Underground excavation is st...

Claims

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Application Information

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IPC IPC(8): E21D9/06E21F11/00G01N33/22E21F17/18B01D46/00
CPCE21D9/06E21F11/00G01N33/225E21F17/18B01D46/00B01D46/66
Inventor 王国义杨建军蒋宗全孟庆明王成刘秀争田春雨
Owner POWERCHINA RAILWAY CONSTR
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