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Anti-freezing method and device for tunnel fire-fighting pipeline in cold region

An anti-freezing technology in cold areas, applied in mining equipment, earth cube drilling, mining equipment, etc., can solve the problems of long freezing period, high energy consumption, high operating cost of electric heating system, etc. Energy saving and emission reduction, simple composition effect

Pending Publication Date: 2021-12-28
BEIJING JIAOKE HIGHWAY SURVEYING DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the actual operation of the tunnel, due to the long freezing period and low temperature in the cold area, in order to ensure that the water in the fire water pipe does not freeze, the heating cable is required to keep the fire water pipe warm for a long time. Sometimes the heating cable will work without intermittent work, resulting in the operation of the electric heating system High cost and high energy consumption

Method used

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  • Anti-freezing method and device for tunnel fire-fighting pipeline in cold region
  • Anti-freezing method and device for tunnel fire-fighting pipeline in cold region
  • Anti-freezing method and device for tunnel fire-fighting pipeline in cold region

Examples

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Embodiment 1

[0029] A single-hole, one-way, two-lane expressway tunnel in a cold area in Shaanxi. The tunnel is 8,010 meters long. The tunnel’s freezing period is about 4 months, and the daily temperature at the entrance of the tunnel is -16°C to -22°C. The fire supervisor in the weak current cable trench of the tunnel adopts DN200, and the two weak current cable trenches at the entrance and exit of the left and right tunnels are equipped with a 2,500-meter sealed rock wool insulation layer with a thickness of 0.03m. The investment in laying the sealed insulation layer is about 110,000 yuan. After laying the sealing insulation layer, the weak current cable trench of the tunnel is sealed and the thermal insulation is enhanced, which delays the freezing time of the fire-fighting pipeline for about 9 hours, reduces the number and time of electric auxiliary heating of the fire-fighting pipeline, saves about 296,000 degrees of energy per year, and saves 356,000 funds Yuan.

Embodiment 2

[0031] A single-hole, one-way, two-lane expressway tunnel in a cold area in Gansu. The tunnel is 1,900 meters long. The tunnel’s freezing period is about 4 months, and the daily temperature at the entrance of the tunnel is -18°C to -24°C. DN150 is used for the fire protection supervisor in the weak current trench of the tunnel. The two weak current cable trenches at the entrance and exit of the left and right tunnels are equipped with a 1900-meter sealed rock wool insulation layer with a thickness of 0.03m. The investment for laying the sealed insulation layer is about 70,000 yuan. After laying the sealing insulation layer, the weak current cable trench of the tunnel is sealed and the thermal insulation is enhanced, which delays the freezing time of the fire-fighting pipeline for about 8 hours, reduces the number and time of electric auxiliary heating of the fire-fighting pipeline, saves about 75,000 degrees of energy per year, and saves 80,000 funds Yuan.

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Abstract

The invention provides an anti-freezing method and device for a tunnel fire-fighting pipeline in a cold region. In the cold region, through the designed sealing and heat preservation measures of a tunnel weak-current cable trench, a closed space is formed in the weak-current cable trench from a tunnel portal to the laying end of an electric heat tracing heat preservation heating cable, and the closed space is isolated from the environment, and the wind speed in the weak-current cable trench is reduced while the weak-current cable trench is subjected to heat preservation (namely, the fire-fighting pipeline is subjected to heat preservation). The device comprises a weak current cable trench cover plate upper heat preservation layer (8), a tunnel portal heat preservation layer (9), a tunnel inner electric heat tracing heat preservation heating cable laying end heat preservation layer (10), a tunnel portal heat preservation fixing groove (11) and a tunnel inner electric heat tracing heat preservation heating cable laying end heat preservation fixing groove (12). As the temperature drop speed (namely the fire-fighting water pipe temperature drop speed) of the tunnel weak current cable trench is reduced, the operation intermittent time of a tunnel fire-fighting electric heat tracing system is increased, and the operation cost and energy consumption of the tunnel fire-fighting electric heat tracing system are reduced.

Description

technical field [0001] The invention belongs to the technical field of tunnel engineering, and in particular relates to an anti-freezing method and device for a tunnel fire-fighting system in a cold region. Background technique [0002] In road tunnels, especially mountain tunnels, the fire water pipes are placed in the weak current cable trench outside the driving direction of the tunnel. (that is, the length of anti-freeze fortification of fire-fighting pipelines in the tunnel) measures for setting electric heat tracing and heat preservation systems (heating cables and heat insulation layers) on fire-fighting pipelines. [0003] In the actual operation of the tunnel, due to the long freezing period and low temperature in the cold area, in order to ensure that the water in the fire water pipe does not freeze, the heating cable is required to keep the fire water pipe warm for a long time. Sometimes the heating cable will work without intermittent work, resulting in the opera...

Claims

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Application Information

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IPC IPC(8): E21F17/00E21F17/06
CPCE21F17/00E21F17/06
Inventor 汤召志杨秀军张晋阳金蕊袁浩庭成亮
Owner BEIJING JIAOKE HIGHWAY SURVEYING DESIGN & RES INST