CN113622997A - Comprehensive cable tunnel - Google Patents
Comprehensive cable tunnel Download PDFInfo
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- CN113622997A CN113622997A CN202111007835.6A CN202111007835A CN113622997A CN 113622997 A CN113622997 A CN 113622997A CN 202111007835 A CN202111007835 A CN 202111007835A CN 113622997 A CN113622997 A CN 113622997A
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- 238000009423 ventilation Methods 0.000 claims description 38
- 238000003860 storage Methods 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 description 16
- 230000009194 climbing Effects 0.000 description 7
- 230000007480 spreading Effects 0.000 description 5
- 238000003892 spreading Methods 0.000 description 5
- 230000001535 kindling effect Effects 0.000 description 4
- 238000005192 partition Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 4
- 239000000779 smoke Substances 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 230000002269 spontaneous effect Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
- E21F17/103—Dams, e.g. for ventilation
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F1/00—Ventilation of mines or tunnels; Distribution of ventilating currents
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F3/00—Cooling or drying of air
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F5/00—Means or methods for preventing, binding, depositing, or removing dust; Preventing explosions or fires
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- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Ventilation (AREA)
Abstract
The invention discloses a comprehensive cable tunnel, which comprises a cable tunnel and a firewall, wherein the cable tunnel comprises a main channel and a side channel, the main channel and the side channel form a set structure of a Tesla valve, the firewall is arranged in the main channel in an opening and closing manner, the cable tunnel is ventilated through the side channel when the firewall is closed, the cable tunnel further comprises an overhaul inlet and an overhaul outlet which are respectively arranged at two ends of the cable tunnel, air in the tunnel can be replaced in time, and the temperature in the cable tunnel is ensured.
Description
Technical Field
The invention relates to the field of cable tunnel protection, in particular to a comprehensive cable tunnel.
Background
With the rapid development of economy and continuous progress of society in China, power generation and supply enterprises are increasing, power cables are widely applied, convenience is brought to production and life of people, and when the power cables are in fault states such as overload, short circuit and local overheating and under the action of external heat, insulation resistance of an insulating material is reduced, the insulating material loses insulating capability and even burns, and further fire disasters are caused.
The fire is mainly caused by two modes, one mode is cable spontaneous combustion, the most occurs in the condition of low temperature replacement efficiency in a cable tunnel, the second mode is fire ignition, the most occurs in the condition of fire falling into an inlet/outlet of the cable tunnel, in the prior art, the fire prevention measures of the cable tunnel mainly adopt a fire partition, an alarm, an automatic fire extinguishing device, an electric control alarm fire extinguishing inspection device and the like, but the problem of frequent fire can not be solved, the reason is that at least the problems of overhigh temperature and poor ventilation in the tunnel exist, the ventilation modes of the cable tunnel are natural ventilation and mechanical collaborative ventilation, the natural ventilation mode is adopted, a plurality of independent ventilation partitions and higher air outlets are needed, and the mechanical collaborative ventilation is realized by an unorganized air exhaust mode or an unorganized air inlet mode, but in the cable tunnel, except small areas around the air shaft, the area of the effective circulation of the air flow is very small, so the whole ventilation effect of the tunnel is not good, in addition, in view of fire safety of the cable tunnel, construction units often set tight fire partitions in most of the cable tunnels at certain intervals and require that all fire doors in the fire partitions are normally closed, the ventilation in the cable tunnels is further aggravated, so that more dead corners in the tunnel are caused, the air quality is not guaranteed, the personal safety of maintainers cannot be guaranteed, heat generated in the running process of the cable cannot be timely discharged, the temperature in the tunnel can be increased, the current-carrying capacity of the cable is reduced, and the service life of the cable is also shortened.
Therefore, in order to solve the above problems, a comprehensive cable tunnel is needed, which can replace air in the cable tunnel in time and reduce the temperature in the cable tunnel.
Disclosure of Invention
In view of the above, the present invention is directed to overcome the drawbacks of the prior art, and to provide a comprehensive cable tunnel, which can discharge smoke in time, prevent the fire from spreading, and reduce the temperature in the cable tunnel.
The invention relates to a comprehensive cable tunnel, which comprises a cable tunnel obliquely arranged from bottom to top and a firewall arranged in the cable tunnel, the firewall may be any of the prior art firewalls of openable and closable construction for cable tunnels, the detailed description is omitted, and the scheme is generally applied to the climbing cable tunnel with the slope, and when a fire occurs in the climbing cable tunnel, the rapid spread of fire caused by chimney effect is most likely to occur, which causes the temperature in the cable tunnel to be high or low for a long time and is difficult to be eliminated from the adjacent firewall, so that the rescue time is prolonged, of course, the fire-proof and air-proof device can also be applied to other cable tunnels, still has the effects of isolating fire and naturally ventilating, the cable tunnel comprises a main and a side, which constitute a set configuration of tesla valves, the firewall is arranged in the main channel in an opening and closing mode, and the cable tunnel is ventilated through the side channel when the firewall is closed. When a fire occurs, the fire extinguishing device in the cable tunnel is easy to have the condition of incomplete fire extinguishing treatment, and still needs field operators to assist in extinguishing the fire, but on the climbing cable tunnel which is in a state that the fire is extinguished but has a possibility of re-burning in a fire scene, the problem of how to control complete fire extinguishing mainly exists in two aspects, the first point is that the space in the cable tunnel is narrow and dense, auxiliary smoke exhausting equipment is needed or fire extinguishing time is prolonged for treatment, and the second point is that the fire continuously spreads due to chimney effect, the temperature in the cable tunnel is extremely high, so that the operators have to frequently extinguish the fire in a rotation mode, in the scheme, the main channel and the side channel form a set structure of a Tesla valve, and the gas flow direction accelerates the discharge of gas in the cable tunnel from bottom to top, so that the effective gas flow circulation in the cable tunnel is extremely increased, and the fire wall is normally closed, not only can ensure the effective replacement of the gas in the cable tunnel but also can prevent the fire from spreading, as shown in the figure, the side channel is a bending cavity with an accelerating effect, so that the replacement of the gas in the tunnel can be accelerated under the condition of natural ventilation of the cable tunnel, the cable heat can be carried away, the segmented main channel is separated by a firewall, the natural ventilation of the cable tunnel can be realized, the ventilation efficiency is improved, the fire can be controlled between adjacent firewalls even if the fire happens, and the firewall is opened to form a specific structure of a Tesla valve when the fire in the tunnel is deeply extinguished subsequently, the ventilation effect is continuously accelerated, the temperature in the tunnel is continuously reduced, the control of the fire in the cable tunnel is accelerated, more specifically, when the fire happens to a certain section of the main channel, the fire is extinguished by a fire extinguishing device such as a hanging type fire extinguisher and the like only need to be closed, and because there is no combustible substance in the side road, the fire can not spread to another section main road, when the rescue personnel arrive, other fire-proof walls are opened to improve the ventilation effect, the temperature in the cable tunnel is taken away in an acceleration way, and the rescue efficiency is improved.
Furthermore, if n firewall, the main road is divided into n +1 sections by n firewall, the side road is n sections, and the n sections of side road are arranged on two sides of the main road along the extending direction of the main road in a penetrating way. As shown in the figure, the two adjacent main passages are both separated by the firewall and communicated by the side passages, so that the air flow can effectively replace the air in the cable tunnel, take away the redundant heat, and improve the current-carrying capacity and service life of the cable.
Further, each firewall is arranged at the far end of each section of main channel along the airflow direction. The far end be the far end of air current flow direction, that is to say the air current can be at every section main road inner chamber circulation, then the adjacent side way of rethread, as shown in the figure, this scheme air current direction from bottom to top, the hot wall that prevents in every corresponding section main road all sets up the top at corresponding main road for the air current can effectively gush into next section main road by the acceleration that the side way produced in every section main road, and effectively detain in every section main road and take away the heat that is produced by the cable, prevent that cable overload etc. from taking place spontaneous combustion. The fire wall is normally closed, even if a fire occurs, the fire can be still effectively controlled in a certain section of main channel, the normally closed fire wall can be opened during rescue to form a one-way air guide structure similar to a one-way valve, namely, the fire is prevented from spreading downstream, and redundant heat is taken away under the condition of controlling the fire through the blocking of the fire wall, so that the fire on the certain section of main channel is extinguished.
Furthermore, the cable tunnel further comprises a ventilation opening communicated with the inlet and/or the outlet, and an included angle is formed between the ventilation opening and the opening direction of the cable tunnel. Often exist under the natural draft condition because the entry in cable tunnel and cable tunnel's export set up improperly, the moist extinguishing device of ponding in the cable tunnel that arouses is scrapped, lead to the rescue of putting out a fire untimely, or debris pile up the exit of ventiduct, and gas can not obtain effective replacement in the cable temperature rising cable tunnel, lead to the kindling rapid condition, so this scheme is the condition of solving the interior condition of a fire frequently of cable tunnel from the root, still make cable tunnel's entry and/or export and vent angular separately set up, prevent that the kindling from igniting this kind of condition and taking place, and improve the effective ventilation in the cable tunnel.
Further, the vent is arranged on the side wall of the cable tunnel below the ground, and the inlet/outlet is arranged at the top end of the cable tunnel along the extending direction of the cable tunnel. As shown in the figure, the cable tunnel and the ventilation opening are both arranged under the ground, great convenience is provided for the arrangement of cable lines, and the frequent fire at the inlet/outlet of the cable tunnel can be effectively reduced.
Further, an insulating assembly is disposed between the vent and the inlet/outlet, the insulating assembly including at least a grill for separately ventilating the vent and the inlet/outlet. The grille is at least provided with an air guide opening which can be in a hole shape, a strip shape and other structures, and mainly plays a role in ventilating and isolating external fire and sundries.
Further, the grid sets up the bottom of vent, isolated subassembly is still including setting up the baffle at grid top, the baffle is the contained angle with ground. The baffle is used for preventing external sundries from falling into the cable tunnel, has the effects of preventing rainwater and the like, and ensures the effective operation of the fire extinguishing system in the cable tunnel.
Furthermore, the baffle extends obliquely downwards and is arranged on the outer wall of the cable tunnel, the grating extends obliquely upwards and is connected to the baffle, and an air guide opening which is inclined downwards is formed in the grating. As shown in the figure, the baffle plate is inclined outwards in an inclined way, the outer part is the outer side of the cable tunnel, the air guide opening is in a strip shape and is arranged in the grid in parallel and obliquely downwards in the lower direction for preventing rainwater and the like from entering the cable tunnel through the vent opening,
further, the bottom surface of the vent is sunken downwards to form a storage cavity. The storage cavity is used for storing sundries, fire seeds and the like falling to the ventilation opening and preventing the sundries, the fire seeds and the like from entering the cable tunnel through the air guide opening.
Further, the cable tunnel exports the inclined cable tunnel at last for the entry under, and the entry is provided with first vent, and the export is provided with the second vent, first vent is seted up along vertical direction with the entry side by side, and isolated through insulating subassembly, second vent is seted up along vertical direction with the export side by side, and isolated through insulating subassembly.
The invention has the beneficial effects that: the comprehensive cable tunnel disclosed by the invention is mostly applied to climbing tunnels, smoke discharge of a chimney effect can be accelerated through the arranged Tesla valve structure, the protection measures of the cable tunnel can be guaranteed not to be influenced, air in the cable tunnel can be quickly replaced in a natural ventilation state, and redundant heat can be quickly taken away to provide great convenience for rush repair of subsequent cable circuits when fire occurs.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of FIG. 1 taken along the line A-A.
Detailed Description
Fig. 1 is a schematic structural diagram of the present invention, fig. 2 is a schematic structural diagram of the direction from a to a in fig. 1 of the present invention, as shown in the drawings, the integrated cable tunnel in this embodiment includes a cable tunnel obliquely opened from bottom to top and a firewall 4 disposed in the cable tunnel, the firewall 4 may be any firewall 4 of an openable and closable structure for the cable tunnel in the prior art, and is not described herein again, this scheme is generally applied to a climbing cable tunnel with a slope, because when a fire occurs in such a climbing cable tunnel, a fire caused by a chimney effect is most likely to rapidly spread, which causes a long-term temperature in the cable tunnel to be high or low, and is difficult to be eliminated from an adjacent firewall 4, so that rescue time is prolonged, and of course, the scheme can also be applied to other cable tunnels, and still has an effect of breaking the fire and enabling natural ventilation, the cable tunnel includes a main tunnel 01 and a side tunnel 02, the main passage 01 and the side passage 02 constitute a Tesla valve setting structure, the firewall 4 is arranged in the main passage 01 in an opening and closing mode, the cable 03 is arranged in the main passage, and the cable tunnel is ventilated through the side passage 02 when the firewall 4 is closed. When a fire occurs, the fire extinguishing device in the cable tunnel is easy to have the condition of incomplete fire extinguishing treatment, and still needs field operators to assist in extinguishing the fire, but on the climbing type cable tunnel which is extinguished but has a possible reignition state in a fire scene, the problem of how to control complete fire extinguishing mainly exists in two aspects, namely, the first point is that the space in the cable tunnel is narrow and dense, auxiliary smoke exhausting equipment is needed or fire extinguishing time is prolonged for treatment, and secondly, because of continuous spread of fire caused by chimney effect, the temperature in the cable tunnel is extremely high, so that the operators have to frequently extinguish the fire in a rotation mode, in the scheme, the main channel 01 and the side channel 02 form a set structure of a Tesla valve, and the gas flow direction accelerates the discharge of gas in the cable tunnel from bottom to top, so that the effective gas flow circulation in the cable tunnel is extremely increased, and because the firewall is normally closed 4, not only can ensure the effective replacement of the gas in the cable tunnel but also can prevent the fire from spreading, as shown in the figure, the side passage 02 is a bending cavity with an accelerating effect, so that the replacement of the gas in the tunnel can be accelerated under the condition of natural ventilation of the cable tunnel, the cable heat can be taken away, the segmented main passage 01 is separated by the firewall 4, the natural ventilation of the cable tunnel can be realized, the ventilation efficiency is improved, the fire can be controlled between the adjacent firewalls 4 even if the fire happens, and the firewall 4 is opened to form a specific structure of a Tesla valve when the fire in the tunnel is deeply extinguished subsequently, the ventilation effect is continuously accelerated, the temperature in the tunnel is continuously reduced, the control of the fire in the cable tunnel is accelerated, more specifically, when the fire happens to a certain section of the main passage 01, only the firewall 4 is closed, put out a fire by extinguishing device like suspension type fire extinguisher etc to because there is not combustible substance in the side road 02, the intensity of a fire can not stretch to another section main road 01, opens other hot wall 4 improvement ventilation effect that prevent when the rescue personnel arrive, accelerates to take away temperature in the cable tunnel, improves rescue efficiency.
In this embodiment, if n firewall 4 are provided, the main lane 01 is correspondingly divided into n +1 sections by the n firewall 4, the side lane 02 is n sections, and the n sections of side lanes 02 are alternately arranged on two sides of the main lane 01 along the extending direction of the main lane 01. As shown in the figure, two adjacent main passages 01 are separated by a firewall 4 and communicated through a side passage 02, so that gas in the cable tunnel is effectively replaced by airflow, redundant heat is taken away, and the current-carrying capacity and the service life of the cable are improved.
In this embodiment, each firewall 4 is disposed at the far end of each segment of the main duct 01 in the airflow direction. The far end be the far end of air current flow direction, that is to say the air current can be in the circulation of every section of main road 01 inner chamber, and then the adjacent side way 02 of rethread, as shown in the figure, this scheme air current direction from bottom to top, the fire wall 4 in every section of main road 01 of correspondence all sets up the top at corresponding main road 01 for the air current can effectively gush into next section of main road 01 by the acceleration that the side way 02 produced in every section of main road 01, and effectively detain in every section of main road 01 and take away the heat that is produced by the cable, prevent that cable overload etc. from taking place spontaneous combustion. Prevent the fire wall 4 normal close, even take place the condition of a fire still can be with the condition of a fire effective control in certain section main road 01, open the one-way wind-guiding structure that the fire wall 4 of normal close can form approximate check valve during the rescue, prevent promptly that the intensity of a fire from spreading downstream, and through preventing of preventing the wall 4, take away unnecessary heat under the condition of control condition of a fire for put out the fire to certain section main road 01.
In the embodiment, the cable tunnel further comprises a ventilation opening communicated with the inlet 1 and/or the outlet 2, and an included angle is formed between the ventilation opening and the opening direction of the cable tunnel. There is often because entry 1 of cable tunnel and cable tunnel's export 2 sets up improperly under the natural draft condition, ponding moist extinguishing device in the cable tunnel that arouses is scrapped, lead to the rescue of putting out a fire untimely, or debris pile up exit 2 of ventiduct, and gas can not get effective replacement in the cable temperature risees the cable tunnel, lead to the rapid condition of kindling, so this scheme is the condition of solving the interior condition of a fire frequently of cable tunnel from the root, still make cable tunnel's entry 1 and/or export 2 and vent angular separately set up, prevent that kindling from igniting this kind of condition and taking place, and improve the effective ventilation in the cable tunnel.
In this embodiment, the ventilation opening is formed in a side wall of the cable tunnel below the ground, and the inlet 1/outlet 2 is formed at the top end of the cable tunnel along the extending direction of the cable tunnel. As shown in the figure, the cable tunnel and the ventilation opening are both arranged under the ground, great convenience is provided for the arrangement of cable lines, and the frequent fire condition of the inlet 1/outlet 2 of the cable tunnel can be effectively reduced.
In this embodiment, an insulating assembly is disposed between the vent and the inlet 1/outlet 2, and the insulating assembly at least includes a grill 31 for separately ventilating the vent and the inlet 1/outlet 2. The grille 31 is at least provided with an air guide opening 33, the air guide opening 33 can be in a hole shape, a strip shape and other structures, and the grille 31 mainly plays a role in ventilating and isolating external fire and sundries.
In this embodiment, the grille 31 is arranged at the bottom of the ventilation opening, the isolation assembly further comprises a baffle 32 arranged at the top of the grille 31, and the baffle 32 forms an included angle with the ground. The baffle 32 is used for preventing external sundries from falling into the cable tunnel, and the baffle 32 also has the effects of preventing rainwater and the like, so that the effective operation of the fire extinguishing system in the cable tunnel is ensured.
In this embodiment, the baffle 32 extends obliquely downward and is disposed on the outer wall of the cable tunnel, the grid 31 extends obliquely upward and is connected to the baffle 32, and the grid 31 is provided with an air guiding opening 33 extending obliquely downward. As shown in the figure, the baffle 32 is inclined outwards in an inclined manner, the outer side is the outer side of the cable tunnel, the air guide opening 33 is in a strip shape, is arranged in parallel and is inclined downwards in the grid 31 to prevent rainwater and the like from entering the cable tunnel through the vent,
in this embodiment, the bottom surface of the vent is recessed downward to form a storage cavity. The storage cavity is used for storing sundries, fire seeds and the like falling to the ventilation opening and preventing the sundries, the fire seeds and the like from entering the cable tunnel through the air guide opening 33.
In this embodiment, the cable tunnel is the inclined cable tunnel that entry 1 exports 2 under and is last, and entry 1 is provided with first vent 11, and export 2 is provided with second vent 12, first vent 11 is seted up side by side along vertical direction with entry 1, and isolated through isolated subassembly, second vent 12 is seted up side by side along vertical direction with export 2, and isolated through isolated subassembly.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (9)
1. A comprehensive cable tunnel is characterized in that: the cable tunnel comprises a cable tunnel and a firewall, wherein the cable tunnel comprises a main channel and a side channel, the main channel and the side channel form a set structure of a Tesla valve, the firewall can be arranged in the main channel in an opening and closing mode, and the cable tunnel ventilates through the side channel when the firewall is closed.
2. The integrated cable tunnel of claim 1, wherein: if n firewall, the main road is correspondingly divided into n +1 sections by n firewall, the side road is n sections, and the n sections of side road are arranged on two sides of the main road in a penetrating way along the extending direction of the main road.
3. The integrated cable tunnel of claim 2, wherein: the cable tunnel is characterized by further comprising a ventilation opening communicated with the inlet and/or the outlet, and an included angle is formed between the ventilation opening and the opening direction of the cable tunnel.
4. The integrated cable tunnel of claim 2, wherein: each firewall is arranged at the far end of each section of main channel along the airflow direction.
5. The integrated cable tunnel of claim 3, wherein: the ventilation opening is formed in the side wall of the cable tunnel below the ground, and the inlet/outlet is formed in the top end of the cable tunnel along the extending direction of the cable tunnel.
6. The integrated cable tunnel of claim 5, wherein: an insulating assembly is arranged between the ventilation opening and the inlet/outlet, and the insulating assembly at least comprises a grating for separately ventilating the ventilation opening and the inlet/outlet.
7. The integrated cable tunnel of claim 6, wherein: the grid sets up the bottom of vent, isolated subassembly is still including setting up the baffle at grid top, the baffle is the contained angle with ground.
8. The integrated cable tunnel of claim 7, wherein: the baffle extends obliquely downwards and is arranged on the outer wall of the cable tunnel, the grating extends obliquely upwards and is connected to the baffle, and an air guide opening which is inclined downwards is formed in the grating.
9. The integrated cable tunnel of claim 5, wherein: the bottom surface of the vent is downwards sunken to form a storage cavity.
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| CN202111007835.6A CN113622997B (en) | 2021-08-30 | 2021-08-30 | Comprehensive cable tunnel |
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| CN202111007835.6A CN113622997B (en) | 2021-08-30 | 2021-08-30 | Comprehensive cable tunnel |
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| CN113622997A true CN113622997A (en) | 2021-11-09 |
| CN113622997B CN113622997B (en) | 2022-08-12 |
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| Title |
|---|
| 傅荣生等: "隧道电力电缆通道的防火设计思考", 《科技信息(科学教研)》 * |
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| Publication number | Publication date |
|---|---|
| CN113622997B (en) | 2022-08-12 |
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