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Long distance ventilation method for extra-long tunnel construction

A ventilation method and long-distance technology, applied in mine/tunnel ventilation, earthwork drilling, mining equipment, etc., can solve the problems of poor breathing environment for construction workers, and achieve the effect of avoiding mutual interference

Active Publication Date: 2019-11-12
CHINA RAILWAY TUNNEL GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a long-distance ventilation method for super-long tunnel construction to solve the technical problem of poor breathing environment for construction workers during super-long tunnel construction

Method used

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  • Long distance ventilation method for extra-long tunnel construction
  • Long distance ventilation method for extra-long tunnel construction
  • Long distance ventilation method for extra-long tunnel construction

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: A long-distance ventilation method for the construction of an extra-long tunnel. The extra-long tunnel includes a main tunnel 2, a level guide tunnel 1 and an auxiliary channel for connecting the main tunnel 2 and the level guide tunnel 1, including the following steps:

[0037] Determine the ventilation equipment that matches the oxygen demand in the construction area and the length of the tunnel. The ventilation equipment includes ventilation ducts, hair dryers and exhaust fans. The frequency conversion fan is selected for the hair dryer, and the jet fan is selected for the exhaust fan;

[0038] The end area of ​​the extra-long tunnel is excavated by the drill and blast method, so that the horizontal guide tunnel can meet the starting operation conditions of the small TBM machine, and the main tunnel can meet the starting operation conditions of the large TBM machine; among them, the first construction team excavated the small section of the horizontal gui...

Embodiment 2

[0044] Embodiment 2: A long-distance ventilation method for the construction of an extra-long tunnel. The construction project is located in a tunnel at an altitude of 1300 meters on the Yunnan-Guizhou Plateau, including the following steps:

[0045] (1) Calculate and obtain the controlled air volume after altitude correction;

[0046] The air volume required for construction ventilation is calculated according to the maximum number of people working simultaneously in the cave, the minimum wind speed allowed in the cave, the amount of gun smoke that needs to be removed for one-time blasting, the total power of internal combustion mechanical equipment, and the air volume required for cooling, and the maximum value is taken as the control air volume. Finally, make an altitude correction. The main calculations are as follows:

[0047] ①Calculated according to the maximum number of people working at the same time in the cave

[0048] Q 人 =q·n

[0049] In the formula: q - the v...

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Abstract

The invention discloses a long distance ventilation method for extra-long tunnel construction. An extra-long tunnel includes a positive tunnel, a flap pilot tunnel and an auxiliary channel for connecting the positive tunnel and the flap pilot tunnel, the long distance ventilation method includes the steps that ventilation equipment matched with oxygen requirement of a construction area and the length of the tunnel is determined; a first construction team excavates the flap pilot tunnel with a small section, a first ventilation pipeline for supplying oxygen to the first construction team is arranged in the flat pilot tunnel, and the first ventilation pipeline adopts forced ventilation; and when the construction surface of the first construction team is at least one auxiliary channel ahead of the construction surface of a second construction team, a third construction team excavates the auxiliary channel and the positive tunnel with a small section, and a first branch pipe for supplyingoxygen to the third construction team is arranged in the first ventilation pipeline. The extra-long tunnel is excavated by a designed and matched ventilation method combined with a tunnel excavation construction method.

Description

technical field [0001] The invention relates to the technical field of tunnel construction, in particular to a long-distance ventilation method for super-long tunnel construction. Background technique [0002] During the construction of the tunnel, it is necessary to adopt ventilation and other methods to create the required air environment for the space of the tunnel and the underground construction project. The purpose of ventilation includes: ① supplying fresh air to the interior of the project; ② removing harmful gases, steam, dust and gun smoke, etc. Harmful substances; ③ Make the temperature, relative humidity and flow velocity of the air inside the project meet the specified standards; ④ For military and civil air defense projects, it is required to have the "three defenses" ventilation function of anti-nuclear weapons, anti-chemical weapons and anti-bacterial weapons. During the construction of tunnels or underground construction projects, due to the geographical and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F1/08E21F1/04E21F1/00
CPCE21F1/006E21F1/04E21F1/08
Inventor 司景钊马亮王亚锋郭海坡黎锋郑清君邢迅轲
Owner CHINA RAILWAY TUNNEL GROUP CO LTD