CN111063250A

CN111063250A - Experimental equipment for simulating full-size underground comprehensive pipe gallery cable fire temperature field

Info

Publication number: CN111063250A
Application number: CN202010066370.0A
Authority: CN
Inventors: 黄萍; 黄伟; 翁鸿; 段在鹏
Original assignee: Fuzhou University
Current assignee: Fuzhou University
Priority date: 2020-01-20
Filing date: 2020-01-20
Publication date: 2020-04-24

Abstract

The invention provides experimental equipment for simulating a full-size underground comprehensive pipe gallery cable fire temperature field, which comprises a pipe gallery main body formed by a reinforced concrete structure, wherein the inside of the pipe gallery main body is hollow and is provided with a support for supporting a cable, the top of the pipe gallery main body is provided with an exhaust fan, the outside of the exhaust fan is provided with a cover body capable of closing an exhaust outlet of the exhaust fan, two ends of the pipe gallery main body are provided with fireproof doors capable of being sealed, one side of the pipe gallery main body, which is far away from the support, is provided with a window, temperature sensors are arranged in the pipe gallery main body at intervals, and a gas sensor is arranged in the pipe gallery main body.

Description

Experimental equipment for simulating full-size underground comprehensive pipe gallery cable fire temperature field

Technical Field

The invention relates to experimental equipment for simulating a full-size underground comprehensive pipe gallery cable fire temperature field.

Background

Underground utility tunnel cable is because not occupying too much ground area, and underground utility tunnel's technique is also considerable maturity, nevertheless lacks the fire prevention simulation design experimental data and the research to current utility tunnel at present.

Disclosure of Invention

The invention improves the problems, namely the technical problem to be solved by the invention is that the existing structure lacks the fire-proof simulation design experiment data and research on the existing comprehensive pipe gallery.

The specific embodiment of the invention is as follows: a experimental facilities for simulating full-size utility tunnel cable fire hazard temperature field, the piping lane main part that constitutes including the reinforced concrete structure, the inside cavity of piping lane main part just is provided with support cable's support, the top of piping lane main part has the exhaust fan, the both ends of piping lane main part have can the confined prevent fire door, one side that the piping lane main part deviates from the support has the window, the interval is provided with temperature sensor in the piping lane main part, and the inside gas sensor that has of piping lane main part, the exhaust fan outside has the cover body that can close the exhaust fan air exit.

Further, the bottom of piping lane main part has the drain, the drain both ends have can the confined closing cap, the top of piping lane main part has the shower nozzle of putting out a fire.

Further, the temperature sensor has a plurality ofly and the equipartition is in piping lane main part top.

Further, adjacent temperature sensors are spaced 9cm apart.

Further, the support has four layers, the length of the electric support is more than or equal to 600 mm, the layer spacing of the support is not less than 250 mm, the distance between the support at the uppermost layer and the top of the pipe gallery body is not less than 350 mm, and the distance between the support at the lowermost layer and the bottom of the top of the pipe gallery body is not less than 100 mm; the clear height of pipe gallery main part is not less than 2.4 meters, and the clear width is not less than 1 meter, and pipe gallery main part length is no more than 200 meters.

Further, the gas sensor includes O₂、CO、CO₂、NO、NO₂、SO₂、H₂S and C_XH_YGas sensingA device.

Compared with the prior art, the invention has the following beneficial effects: the experimental equipment provided by the invention is used as the simulation experimental equipment for the underground comprehensive pipe gallery fire, the occupied area is small, and the scene can be better simulated and the interior can be better analyzed when the fire occurs.

Drawings

FIG. 1 is a schematic view of the internal structure of the present invention.

FIG. 2 is a schematic side view of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1-2, an experimental facilities for simulating full-size utility tunnel cable fire temperature field, pipe gallery main part 10 including reinforced concrete structure constitution, the inside cavity of pipe gallery main part just is provided with support cable's support 20, the top of pipe gallery main part has exhaust fan 30, the both ends of pipe gallery main part have can be confined prevent fire door 40, one side that the pipe gallery main part deviates from the support has window 101, the interval is provided with temperature sensor 510 in the pipe gallery main part, and inside gas sensor 520 that has of pipe gallery main part, the exhaust fan outside has the cover body 310 that can close the exhaust fan air exit.

In this embodiment, the bottom of the pipe rack body has a drain 110, the drain 110 has a closable cover at both ends, and the top of the pipe rack body has a fire suppression spray head 130.

In this embodiment, the temperature sensors 510 are uniformly distributed on the top of the tube lane main body.

In this embodiment, adjacent temperature sensors 510 are spaced 9cm apart.

In this embodiment, the rack has 4 layers, the laid YJV electric wire and cable 100 with the cable model of 10KV, the length of the electric cable rack should be greater than or equal to 600 mm, the interlayer distance of the cable rack should not be less than 250 mm, the distance between the rack on the uppermost layer and the top plate of the pipe gallery should not be less than 350 mm, and the distance between the rack on the lowermost layer and the bottom plate of the pipe gallery should not be less than 100 mm; the clear height of pipe gallery main part is not less than 2.4 meters, and the clear width is not less than 1 meter, and pipe gallery main part length is no more than 200 meters.

In this embodiment, the cover body inner chamber is communicated with an air purification device 60 through a pipeline, the pipeline is provided with a valve body which can control the connection between the cover body inner chamber and the air purification device 60, and the sealing of the interior of the pipe gallery main body during the experiment can also be ensured.

In this embodiment, the pipe gallery main body is provided with a small hole for the gas sensor and the temperature sensor in advance, and the size of the small hole is reserved according to the size of the sensor and the thermocouple. The aperture can be based on different experiment content buries different sensors underground, and temperature sensor can transmit the gas concentration that the pipe gallery storehouse stretchs the top temperature and gas sensor can transmit the pipe gallery storehouse and stretch to the top. The gas sensor comprises O₂、CO、CO₂、NO、NO₂、SO₂、H₂S and C_XH_YA gas sensor.

During operation, the design fire source is located fire prevention subregion center section department, when the cable conflagration takes place in utility tunnel cable compartment. The exhaust device at the top is in a closed state, the drainage ditch is in a closed state through the sealing cover, all the sealing performance is good, a window is arranged on the wall surface at the opposite side of the suspended cable, the window is made of fireproof transparent materials, the cable on one side is ignited under the action of a fire source of the cable on the other side, the cables on the first layer, the second layer and the third layer enter a fire growth stage in sequence, and the heat release rate of the fire source of the cables on the first layer and the second layer is higher than that of the cables on the third layer and the fourth layer; the conflagration growth stage of fourth layer cable is very mild because it is in the top layer, and flame can only stretch along the cable route level at this stage, and the fire plume direct impact piping lane body top that top layer cable fire produced leads to its piping lane body to receive the cooling effect of wall and surrounding cold air great then, so the speed that the intensity of a fire expands is slower. It can be found when getting into the conflagration relatively stable stage, along with the reduction of cable layer height, the intensity of a fire increases, and the stable combustion period reduces gradually, and this is mainly because in the limited airtight piping lane space of oxygen volume, violent conflagration can accelerate the consumption to it, and the carbide layer that produces after the cable surface burns can stop current intensity of a fire to a certain extent, so heat release rate descends rapidly after transient stable combustion. In the stage of fire decline and extinguishment, when a cable fire happens in the pipe gallery, a method of closing a fireproof door and a vent to seal and self-extinguish the cable fire is feasible; as the height of the cable layer increases, the extinguishing speed of the fire becomes slow, so the fire control of the upper cable layer should be emphasized; and because the top layer cable has a low maximum heat release rate, high fire concealment and slow fire growth, the development of the fire source is controlled as far as possible from the source. In the process, the temperature sensor can transmit the top temperature of the pipe gallery bin, so that the roof temperature field change process when different layers of cables in the cable compartment are in fire can be conveniently analyzed, and finally, the effect of simulation experiment is achieved.

After the experiment, the installation of piping lane top has a fan device, is in isolation state during operating condition with the external world, and the leakproofness is good. After the experiment is finished, the exhaust device is opened, harmful gas can be timely removed, and the end part of the exhaust fan 30 is connected with an air purification device, so that the removed gas is prevented from polluting air and causing secondary damage to a human body.

Meanwhile, a water spraying device is also arranged on the top of the experimental facility on the top of the gallery of the pipe body, and the water source contains chemical substances for neutralizing harmful gases. After the experiment, partial harmful gas can be diluted in time through the watering device, the drainage channel 110 that is laid at the facility lower part, and unnecessary water is directly discharged through drainage channel 110.

Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.

If the invention discloses or relates to parts or structures which are fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).

In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes unless otherwise stated.

Any part provided by the invention can be assembled by a plurality of independent components or can be manufactured by an integral forming process.

Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims

1. The experimental equipment for simulating the fire temperature field of the cable fire of the full-size underground integrated pipe gallery is characterized in that, it includes the main body of the pipe gallery composed of the reinforced concrete structure, and the interior of the main body of the pipe gallery is hollow and is provided with a bracket for supporting the cable, so The top of the main body of the pipe gallery is provided with an exhaust fan, the two ends of the main body of the pipe gallery are provided with fire doors that can be closed, the side of the main body of the pipe gallery away from the bracket has a viewing window, and the main body of the pipe gallery is provided with temperature sensors at intervals, The main body of the pipe gallery has a gas sensor inside, and the outside of the exhaust fan has a cover that can close the air outlet of the exhaust fan.

2. The experimental equipment for simulating the fire temperature field of cables in a full-scale underground integrated pipe gallery according to claim 1, characterized in that, the bottom of the main body of the pipe gallery has a drainage channel, and both ends of the drainage channel have a closed The top of the main body of the pipe gallery is provided with a fire extinguishing nozzle.

3 . The experimental equipment for simulating the fire temperature field of cables in a full-scale underground integrated pipe gallery according to claim 1 , wherein the temperature sensors have multiple and are evenly distributed on the top of the main body of the pipe gallery. 4 .

4 . The experimental equipment for simulating the fire temperature field of cables in a full-scale underground utility tunnel according to claim 3 , wherein the interval between adjacent temperature sensors is 9 cm. 5 .

5. The experimental equipment for simulating the fire temperature field of cables in a full-scale underground integrated pipe gallery according to claim 1, wherein the support has four layers, the length of the electrical support should be greater than or equal to 600 mm, and the support layer has four layers. The spacing should not be less than 250 mm, the distance between the uppermost bracket and the top of the pipe gallery body should not be less than 350 mm, and the distance between the lowermost bracket and the top bottom of the pipe gallery body should not be less than 100 mm; the clear height of the pipe gallery body should not be less than 2.4 mm m, the net width shall not be less than 1 m, and the length of the main body of the pipe gallery shall not exceed 200 m.

6 . The experimental equipment for simulating the fire temperature field of cables in a full-scale underground integrated pipe gallery according to claim 1 , wherein an air purification device is connected to the inner cavity of the housing through a pipeline. 7 .

7 . The experimental equipment for simulating the fire temperature field of cables in a full-scale underground utility tunnel according to claim 1 , wherein the gas sensor comprises O ₂ , CO, CO ₂ , NO, NO ₂ , SO ₂ . , H ₂ S and C _X _HY gas sensors.