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Small-section tunnel single-head long-distance ventilation construction method

A construction method and long-distance technology, which can be used in mine/tunnel ventilation, earthwork drilling, mining equipment, etc., can solve the problems of inconvenient maintenance and replacement of equipment, difficult to control ventilation effect, complex structure, etc., to achieve good ventilation effect, It is convenient for maintenance and replacement of equipment, and the effect of reducing smoke exhaust time

Inactive Publication Date: 2015-05-13
CHINA RAILWAY 23RD CONSTR BUREAU LTD
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Problems solved by technology

[0004] In the long-distance ventilation construction of small-section tunnels, the ventilation effect is difficult to control due to the small section of the front tunnel and the long distance of the single-head excavation. In China, the ventilation effect is good and the supply of fresh air is sufficient for each person. In general, the cost is relatively high, and the structure is complicated at the same time, making it inconvenient to maintain and replace equipment

Method used

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  • Small-section tunnel single-head long-distance ventilation construction method
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  • Small-section tunnel single-head long-distance ventilation construction method

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Embodiment 1

[0028] This embodiment combines the development of tunnel construction ventilation technology in recent years, taking the 1# inclined shaft (single-lane inclined shaft) of Baoanying Tunnel in the Miyi-Panzhihua section of the Chengdu-Kunming Railway’s capacity expansion and reconstruction project as an example. The starting and ending mileage of Baoanying Tunnel is LXD4K1+070 ~LXD4K14+396, with a total length of 13326m and a maximum buried depth of 877m, is designed as a single-track tunnel with a clearance of 4.5m×6.6m. In order to meet the construction period, disaster prevention and rescue, and construction ventilation needs, the tunnel has 3 inclined shafts: Among them, the 1# inclined shaft is 2460m long and has a slope of 8.6%. The length is 4475m; the length of 2# inclined shaft is 1898m, the slope is 10%, and the construction of LXD4K6+815~LXD4K9+500 main tunnel is 2685m, and the maximum excavation length is 4583m; The construction of LXD4K14+396 main tunnel is 4896m, ...

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Abstract

The invention relates to the field of small-section tunnel single-head long-distance ventilation, in particular to a small-section tunnel single-head long-distance ventilation construction method. The small-section tunnel single-head long-distance ventilation construction method includes the steps of A, analyzing a pollution source, and determining the ventilation standard; B, designing a ventilation system; C, calculating tunnel ventilation parameters, selecting a draught fan, and implementing the scheme. The ventilation system is specifically characterized in that during main tunnel construction, the draught fan is arranged at an outer opening of an inclined shaft, the pressed ventilation mode is adopted, an air pipe extends into a main tunnel and is branched in the advancing directions of the two working faces of the main tunnel, jet fans are arranged on the two sides of an inner opening of the inclined shaft, and the jet directions of the jet fans face the inner opening of the inclined shaft. The small-section tunnel single-head long-distance ventilation construction method is good in ventilation effect and low in cost, and brings convenience to device maintenance and device replacement.

Description

technical field [0001] The invention relates to the field of single-head long-distance ventilation of small-section tunnels, in particular to a construction method for single-head long-distance ventilation of small-section tunnels. Background technique [0002] With the leap-forward development of national railways, a large number of high-grade railways have started construction. Due to the limitation of design speed and terrain, many long mountain tunnels have been constructed in recent years. The construction of long tunnels adopts inclined shafts or flat guides and The tunnels are constructed in parallel to speed up the tunnel construction progress. However, the construction ventilation of inclined shafts (level guides) is an insurmountable technical problem, especially the many problems of ventilation and smoke exhaust during the construction of small-section tunnels. [0003] During tunnel excavation, due to drilling, explosive blasting, slag loading, spraying concre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F1/00E21F1/08
CPCE21F1/003E21F1/08
Inventor 刘海涛田宝华陈幼林张强闫宏斌闫辰骞霍莉
Owner CHINA RAILWAY 23RD CONSTR BUREAU LTD
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