CN216665681U - Device for preventing tunnel fire pipeline in cold area from freezing - Google Patents
Device for preventing tunnel fire pipeline in cold area from freezing Download PDFInfo
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- CN216665681U CN216665681U CN202122693014.4U CN202122693014U CN216665681U CN 216665681 U CN216665681 U CN 216665681U CN 202122693014 U CN202122693014 U CN 202122693014U CN 216665681 U CN216665681 U CN 216665681U
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Abstract
The utility model provides a device for preventing a tunnel fire pipeline from freezing in a cold region, which is characterized in that a sealed heat preservation measure of a tunnel weak current cable trench is adopted in the cold region, so that the weak current cable trench from a tunnel entrance to the laying end of an electric tracing heat preservation heating cable forms a closed space and is isolated from the environment, and the wind speed in the weak current cable trench is reduced while the heat preservation (namely the heat preservation of a fire pipeline) is carried out on the weak current cable trench. The composition comprises: the device comprises a weak current cable trench cover plate upper heat insulation layer (8), a hole heat insulation layer (9), a tunnel internal electric tracing heat insulation heating cable laying end heat insulation layer (10), a tunnel hole heat insulation layer fixing groove (11) and a tunnel internal electric tracing heat insulation heating cable laying end heat insulation layer fixing groove (12). Because the temperature drop speed (namely the fire-fighting water pipe cooling speed) of the tunnel weak current cable trench is reduced, the operation intermittence time of the tunnel fire-fighting electric tracing system is prolonged, and the operation cost and the energy consumption of the tunnel electricity consumption electric tracing system are reduced.
Description
Technical Field
The utility model belongs to the technical field of tunnel engineering, and particularly relates to a device for preventing a tunnel fire pipeline from freezing in a cold region.
Background
Highway tunnel especially mountain tunnel, fire hose place in the weak current cable pit in the tunnel driving direction outside, in cold and severe cold district, in order to prevent that the fire pipeline from freezing, lead to fire extinguishing system unable use, consequently can set up the measure of electric heat tracing heat preservation system (heating cable and heat preservation insulating layer) on the fire pipeline of certain length (need carry out fire pipeline anti-freezing length of seting up defences in the tunnel promptly) in tunnel entrance to the hole in tunnel generally.
In the actual operation of the tunnel, because the freezing period is long and the temperature is low in cold regions, in order to ensure that water in the fire-fighting water pipe is not frozen, the heating cable is required to keep warm for the fire-fighting water pipe for a long time, and sometimes the heating cable does not work intermittently, so that the electric tracing system is high in operation cost and high in energy consumption. How to reduce the running time, the running cost and the energy consumption of the tunnel electricity-preventing heat tracing system under the premise of ensuring the safety and the effectiveness of the tunnel fire-fighting system, improve the reliability of the fire-fighting system and become a difficult problem to be solved urgently in tunnel operation.
SUMMERY OF THE UTILITY MODEL
The utility model provides a device for preventing a fire pipeline from being frozen in a tunnel in a cold region, which reduces the temperature reduction speed (namely the temperature reduction speed of a fire-fighting water pipe) of a fire-fighting pipeline in the weak-current cable trench of the tunnel by the designed sealing and heat-insulating measures of the weak-current cable trench of the tunnel in the cold region, increases the operation intermittence time of a fire-fighting electric tracing system of the tunnel, and reduces the operation cost and energy consumption of the fire-fighting electric tracing system of the tunnel.
Factors influencing the temperature reduction of the fire-fighting water pipe comprise heat preservation measures and wind speed in a weak current cable trench, and in actual engineering, natural wind, vehicle piston wind and mechanical wind generated by operation of a fan arranged in a tunnel are considered, so that air in a tunnel can move in the tunnel to generate wind flow. According to the regulation of highway tunnel ventilation design rules (JTG/T D70/2-02-2014), the wind speed in the tunnel caused by the action of natural wind and the like is about 2 m/s-3 m/s. The upper part of the weak current cable trench is laid by a cover plate, a gap exists between the cover plate and the cover plate, factors such as connection of the opening cable trench and the outside and the like are considered, a certain ventilation air flow exists in the cable trench, and therefore the air speed in the weak current cable trench caused by the air flow in the tunnel is generally larger than 2 m/s.
In order to solve the technical problems, the influence of the existence of additional heat preservation measures outside the weak current cable trench and different wind speeds on the cooling speed of the water-proof pipe is theoretically analyzed. Under the same wind speed, the freezing time of the pipeline can be delayed for 1-2 hours by additionally arranging the heat insulation layer compared with the pipeline without the heat insulation layer; when the additional heat insulation layer is not provided, the wind speed in the weak current cable trench is reduced from 2.0 m/s to 0.05 m/s, and the freezing time of the pipeline is delayed from 17 hours to 25 hours; and (3) laying an additional insulating layer, and delaying the freezing time of the pipeline from 17 hours to 27 hours when the wind speed in the weak current cable trench is reduced to 0.05 m/s from 2.0 m/s. According to the analysis, aiming at the defects in the prior art, the utility model designs that the sealing and heat-insulating layer is laid outside the tunnel cable trench, so that the overall temperature in the cable trench is improved, the ventilation air flow in the cable trench is reduced, the freezing time of the fire-fighting pipeline is greatly delayed, and the problems can be effectively solved.
The technical scheme adopted by the utility model is as follows: the utility model provides a method and a device for sealing a heat-insulating layer of a weak current cable trench in a tunnel in a cold area, which comprises the following steps: the weak current cable trench cover plate comprises a weak current cable trench cover plate upper heat insulation layer (8), a hole heat insulation layer (9), a tunnel internal electric heat tracing heat insulation heating cable laying end heat insulation layer (10), a tunnel hole heat insulation layer fixing groove (11), a tunnel internal electric heat tracing heat insulation heating cable laying end heat insulation layer fixing groove (12), and the weak current cable trench cover plate and the tunnel internal electric heat tracing heat insulation heating cable laying end heat insulation layer fixing groove are respectively fixedly connected and then integrally travel a closed space.
According to the utility model, the weak current cable trench in the tunnel is sealed into a closed space, so that the existence of ventilation airflow in the cable trench is avoided, meanwhile, the overall temperature in the weak current cable trench in the tunnel is improved, the heat loss of the fire-fighting pipeline is effectively reduced, the operation cost of electric heat tracing of the tunnel is finally reduced, the energy conservation and emission reduction of a tunnel fire-fighting system are realized, and the tunnel fire-fighting pipeline anti-freezing heat-preserving system has a good application prospect for the anti-freezing heat preservation of the tunnel fire-fighting pipeline in cold areas and severe cold areas. The method for preserving the heat of the weak current cable trench of the tunnel in the cold region can be applied to not only construction projects but also operated tunnels. The utility model has simple structure, convenient construction and installation and small later maintenance amount.
Drawings
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. Wherein
FIG. 1 is a dimension diagram of a tunnel cable trench model;
FIG. 2 is a cloud view of temperature field distribution at the middle section of a fire pipeline calculation model;
FIG. 3 is a graph of temperature over time for different ventilation airflows;
FIG. 4 is a dimension diagram of a cable trench model for laying an insulating layer in a tunnel;
FIG. 5 is a cloud diagram of temperature field distribution at the middle section of a fire fighting pipeline calculation model after an insulating layer is laid in a cable trench;
FIG. 6 is a graph showing temperature changes with time under different ventilation air flows after an insulating layer is laid on a cable trench;
FIG. 7 is a graph showing the comparison of the freezing time of the pipeline with or without the insulating layer in the cable trench of the tunnel and after the wind speed changes;
FIG. 8 is a structural vertical section arrangement of a weak current cable trench sealing heat-insulating layer in a tunnel in a cold region;
FIG. 9 is a structural cross section arrangement of a weak current cable trench sealing insulation layer in a tunnel in a cold region;
fig. 10 is the structural end arrangement of the weak current cable trench sealing insulation layer in the tunnel in the cold region.
Detailed Description
The utility model is described in further detail below by way of theoretical derivations and embodiments, which are given by way of example only to illustrate the utility model and not to limit the scope of the utility model. The test instruments and the test methods used in the following examples are all conventional methods unless otherwise specified.
As shown in figure 1, the weak current cable trench of a single-hole two-lane tunnel has a clearance area of 0.33m2, an equivalent diameter of 0.57m and an outer circumference of 2.3 m. The longitudinal length of 4m is taken as a calculation model to analyze the influence of the air flow rate on the cooling speed of the water-proof pipe, and seven working conditions that the air temperature in the tunnel is-30 ℃ (243K), and the ventilation air flow speed at the inlet of the cable trench is 0 m/s, 0.01 m/s, 0.05 m/s, 0.1 m/s, 0.4 m/s, 1.0 m/s, 2.0 m/s and the like are assumed respectively. Fig. 2 shows the distribution cloud pictures of the ambient temperature field of the fire fighting pipeline with the middle section of the calculation model at 6h, 18h and 30h under the two working conditions of the wind speed of 0.05 m/s and the wind speed of 2.0 m/s, and fig. 3 shows the temperature change curve of the measuring point 2 (the lowest temperature of the 4 measuring points) under the ventilation wind speed of the seven working conditions along with the time.
As can be seen from FIG. 3, in 2 cases that no ventilation wind current exists in the weak current cable trench and the wind current is 0.01 m/s, the temperature of water in the fire fighting pipeline is respectively reduced to 1.85 ℃ and 1.12 ℃ after 30 hours, the influence of small wind speed on heat loss of the pipeline is proved to be limited, and the water in the fire fighting pipeline does not begin to freeze after 30 hours. With the increasing of the wind speed to 0.05 m/s, 0.1 m/s, 0.4 m/s, 1.0 m/s and 2.0 m/s, the temperature of the water in the fire fighting pipeline is respectively reduced to-0.89 ℃, 1.72 ℃, 2.61 ℃, 2.95 ℃ and 3.12 ℃ after 30 hours, and the water in the fire fighting pipeline still begins to freeze after 30 hours. The low-temperature air current in the outer boundary of the weak current cable trench can continuously flow in, the heat exchange between the ambient cold air and the weak current cable trench is accelerated, and the heat loss of the fire fighting pipeline is obviously accelerated. Therefore, the fire fighting pipeline and the external environment are isolated by the sealing layer outside the weak current cable trench, the heat loss of the weak current cable trench is effectively reduced, and the freezing time of the fire fighting pipeline is delayed.
The fire fighting pipeline is isolated from the external environment by the sealing layer outside the weak current cable trench, so that the heat loss of the weak current cable trench can be effectively reduced, and the freezing time of the fire fighting pipeline is delayed. Therefore, in an original calculation model, a pure sealing material is changed into a heat-insulating material with the thickness of 3 cm, and the size of the model is as shown in figure 4. The longitudinal length of 4m is taken as a calculation model to analyze the influence of the air flow rate on the cooling speed of the water-proof pipe, and seven working conditions that the air temperature in the tunnel is-30 ℃ (243K), and the ventilation air flow speed at the inlet of the cable trench is 0 m/s, 0.01 m/s, 0.05 m/s, 0.1 m/s, 0.4 m/s, 1.0 m/s, 2.0 m/s and the like are assumed respectively. Fig. 5 shows the distribution cloud pictures of the ambient temperature field of the fire fighting pipeline with the middle section of the calculation model at 6h, 18h and 30h under the two working conditions of the wind speed of 0.05 m/s and the wind speed of 2.0 m/s, and fig. 6 shows the temperature change curves of the measuring point 2 (the lowest temperature of the 4 measuring points) under the ventilation wind speed under the seven working conditions along with the time.
As can be seen from FIG. 6, after the heat-insulating layer is laid in the tunnel weak current cable trench, the basic rule of the temperature drop of the fire fighting pipeline along with the change of the wind speed is basically consistent with that of the tunnel weak current cable trench without the heat-insulating layer; under the same wind speed working condition, the temperature drop of the fire fighting pipeline is still reduced to a certain extent compared with the situation that the heat preservation layer is paved outside the weak current cable trench of the tunnel and the heat preservation layer is not paved. FIG. 7 shows the freezing time chart of the fire fighting pipeline when the cable trench is laid with the heat preservation layer for sealing (no ventilation wind current or micro wind speed) and not laid with the heat preservation layer for opening (wind speed 2m/s), as can be seen from FIG. 7, the weak current cable trench is laid with the sealed heat preservation layer for isolating the fire fighting pipeline from the external environment, thereby effectively reducing the heat loss of the weak current cable trench, delaying the freezing time of the fire fighting pipeline for 10 hours, effectively increasing the running clearance of the tunnel fire fighting electric tracing system, and reducing the running cost and energy consumption of the tunnel fire fighting electric tracing system.
According to the theoretical analysis, the utility model provides a method for preserving heat of a weak current cable trench of a tunnel in a cold region, which mainly comprises the following steps: the cross section of the weak current cable trench at the tunnel portal is positioned, heat insulation materials are laid at the upper cable trench cover plate position and the in-tunnel defense length finishing position of the defense pipeline, brick masonry structures are arranged at the in-tunnel defense length finishing position of the defense pipeline in the tunnel portal, and the brick masonry structures are used for fixing the heat insulation materials at two ends, so that a closed space is formed by connection, ventilation airflow in the cable trench is avoided, the integral temperature in the weak current cable trench of the tunnel is improved, the heat loss of the fire fighting pipeline is effectively reduced, the operation cost of electric tracing of the fire fighting water pipe of the tunnel is finally reduced, and energy consumption is reduced.
The structure of the weak current cable trench sealing heat-insulating layer in the tunnel in the cold region is shown in fig. 8, 9 and 10, and the main components comprise: the device comprises a weak current cable trench cover plate upper heat insulation layer (8), a hole heat insulation layer (9), a tunnel internal electric tracing heat insulation heating cable laying end heat insulation layer (10), a tunnel hole heat insulation layer fixing groove (11) and a tunnel internal electric tracing heat insulation heating cable laying end heat insulation layer fixing groove (12).
The main installation process comprises the following steps: the utility model provides a fire control pipeline (2) are installed on cable ditch bottom plate (15) upper portion in the weak current cable pit (5) of following the driving side outside in the tunnel, there is fire-fighting water (1) in fire control pipeline (2), fire control pipeline electric heat tracing heat preservation heating cable (3) are laid to the outside of fire control pipeline (2), heating cable (3) outside lays fire control pipeline's heat preservation (4), fire control pipeline (2) entrance point is tunnel entrance to a cave (13), fire control pipeline (2) rear end is tunnel interior electric heat tracing heat preservation heating cable and lays end department (14). The tunnel opening heat-insulating layer (9) and the heat-insulating layer (10) at the laying end of the electric tracing heat-insulating heating cable in the tunnel are laid on the cross section of the weak-current cable trench, and the lower part of the tunnel opening heat-insulating layer (9) is inserted into the tunnel opening heat-insulating layer fixing groove (11) for fixing; the heat-insulating layer (10) at the laying end of the electric heat-tracing heat-insulating heating cable in the tunnel is inserted into the heat-insulating layer fixing groove (12) at the laying end of the electric heat-tracing heat-insulating heating cable in the tunnel for fixing. The upper part of the weak current cable trench is provided with a cable trench cover plate (6), and the upper part of the cover plate is continuously paved with a heat preservation layer (8) to seal a gap (7) of the cable trench cover plate. The tunnel opening heat preservation layer (9), the tunnel internal electric heat tracing heat preservation heating cable laying end heat preservation layer (10) and the weak electric cable trench cover plate upper portion heat preservation layer (8) are respectively connected and fixed to form a closed space, the purpose that the weak electric cable trench is isolated from the external environment in model calculation is achieved, the freezing time of a fire pipeline can be delayed for 10 hours, the running clearance of a tunnel fire fighting electric heat tracing system is effectively increased, and the running cost and the energy consumption of the tunnel fire fighting electric heat tracing system are reduced.
Example 1:
a single-hole one-way two-lane highway tunnel in a certain cold region in Shaanxi is 8010 m long, the freezing period of the tunnel is about 4 months, and the daily temperature at a hole opening is-16 ℃ to-22 ℃. A fire fighting main pipe in a tunnel weak current cable trench adopts DN200, 2500-meter sealed rock wool heat preservation layers are arranged at an inlet and an outlet of a left tunnel and a right tunnel, the thickness of each heat preservation layer is 0.03m, and the investment of laying the sealed heat preservation layers is about 11 ten thousand yuan. After the sealed heat-insulating layer is laid, the weak current cable trench of the tunnel is sealed, the heat-insulating property is enhanced, the freezing time of the fire fighting pipeline is delayed by about 9 hours, the electric auxiliary heating frequency and time of the fire fighting pipeline are reduced, about 29.6 ten thousand degrees of energy is saved every year, and 35.6 ten thousand yuan of capital is saved.
Example 2:
a single-hole one-way two-lane expressway tunnel in a certain cold region in Gansu province is 1900 m long, the freezing period of the tunnel is about 4 months, and the daily temperature at a hole opening is-18 ℃ to-24 ℃. A fire fighting main pipe in a weak current ditch of the tunnel adopts DN150, 1900 m of sealed rock wool heat preservation layers are arranged in two weak current cable ditches at an inlet and an outlet of a left tunnel and a right tunnel, the thickness of each heat preservation layer is 0.03m, and the investment of laying the sealed heat preservation layers is about 7 ten thousand yuan. After the sealing and heat-insulating layer is laid, the weak current cable trench of the tunnel is sealed, the heat-insulating property is enhanced, the freezing time of the fire fighting pipeline is delayed by about 8 hours, the electric auxiliary heating times and time of the fire fighting pipeline are reduced, about 7.5 ten thousand degrees of energy is saved every year, and 8 ten thousand yuan of capital is saved.
Claims (7)
1. The utility model provides a device that cold area tunnel fire pipeline prevents frostbite, its characterized in that: the heat-insulation and heat-preservation device comprises a weak current cable trench cover plate upper heat-insulation layer (8), a tunnel opening heat-insulation layer (9), a tunnel internal electric heat tracing heat-insulation and heat-preservation cable laying end heat-insulation layer (10), a tunnel opening heat-insulation layer fixing groove (11) and a tunnel internal electric heat tracing heat-preservation and heat-preservation cable laying end heat-insulation layer fixing groove (12), wherein the weak current cable trench cover plate upper heat-insulation layer (8), the tunnel opening heat-insulation layer (9), the tunnel internal electric heat tracing heat-preservation and heat-preservation cable laying end heat-insulation layer (10), the tunnel opening heat-insulation layer fixing groove (11) and the tunnel internal electric heat tracing heat-preservation and heat-preservation cable laying end heat-preservation fixing groove (12) isolate and preserve heat the tunnel opening to the electric heat tracing heat-preservation and heat-preservation cable laying end heat-preservation environment.
2. The device for preventing the fire fighting tunnel in the cold area from freezing as claimed in claim 1, wherein: the upper heat-insulating layer (8) of the weak current cable trench cover plate, the opening heat-insulating layer (9) and the heat-insulating layer (10) at the laying end of the electric tracing heat-insulating heating cable in the tunnel are all made of rock wool sealing heat-insulating materials.
3. The device for preventing the fire fighting tunnel in the cold area from freezing as claimed in claim 2, wherein: the thickness of rock wool is 3 centimetres.
4. The device for preventing the fire fighting tunnel in the cold area from freezing as claimed in claim 2, wherein: the width of the upper insulating layer (8) of the weak current cable trench cover plate is the same as that of the access way.
5. The device for preventing the fire fighting tunnel in the cold area from freezing as claimed in claim 2, wherein: the height and the width of the hole insulating layer (9) and the insulating layer (10) at the laying end of the electric tracing heat-insulating heating cable in the tunnel are consistent with those of the cable trench.
6. The device for preventing the fire fighting tunnel in the cold area from freezing as claimed in claim 1, wherein: the tunnel portal insulating layer fixing groove (11) and the tunnel internal electric heat tracing insulating heating cable laying end insulating layer fixing groove (12) are located at the bottom of the cable trench and are made of brick building components.
7. The device for preventing the fire fighting tunnel in the cold area from freezing as claimed in claim 6, wherein: the brick height is 10cm, and the distance between two bricks is 3.5 cm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122693014.4U CN216665681U (en) | 2021-11-05 | 2021-11-05 | Device for preventing tunnel fire pipeline in cold area from freezing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122693014.4U CN216665681U (en) | 2021-11-05 | 2021-11-05 | Device for preventing tunnel fire pipeline in cold area from freezing |
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| CN216665681U true CN216665681U (en) | 2022-06-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122693014.4U Active CN216665681U (en) | 2021-11-05 | 2021-11-05 | Device for preventing tunnel fire pipeline in cold area from freezing |
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- 2021-11-05 CN CN202122693014.4U patent/CN216665681U/en active Active
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