EP1544408B1 - A system for exhausting flue gases in a tunnel - Google Patents
A system for exhausting flue gases in a tunnel Download PDFInfo
- Publication number
- EP1544408B1 EP1544408B1 EP04388091A EP04388091A EP1544408B1 EP 1544408 B1 EP1544408 B1 EP 1544408B1 EP 04388091 A EP04388091 A EP 04388091A EP 04388091 A EP04388091 A EP 04388091A EP 1544408 B1 EP1544408 B1 EP 1544408B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- duct
- tunnel
- damper
- fire
- pawl
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Not-in-force
Links
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
- E05B—LOCKS; ACCESSORIES THEREFOR; HANDCUFFS
- E05B65/00—Locks or fastenings for special use
- E05B65/10—Locks or fastenings for special use for panic or emergency doors
- E05B65/104—Locks or fastenings for special use for panic or emergency doors actuated in response to heat, e.g. with fusible element, bimetal, memory shape or swelling material
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/02—Fire prevention, containment or extinguishing specially adapted for particular objects or places for area conflagrations, e.g. forest fires, subterranean fires
- A62C3/0221—Fire prevention, containment or extinguishing specially adapted for particular objects or places for area conflagrations, e.g. forest fires, subterranean fires for tunnels
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH 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
- E21F1/003—Ventilation of traffic tunnels
-
- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/02—Fire prevention, containment or extinguishing specially adapted for particular objects or places for area conflagrations, e.g. forest fires, subterranean fires
- A62C3/0292—Fire prevention, containment or extinguishing specially adapted for particular objects or places for area conflagrations, e.g. forest fires, subterranean fires by spraying extinguishants directly into the fire
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/33—Responding to malfunctions or emergencies to fire, excessive heat or smoke
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
- F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
- F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
- F24F13/1426—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means
Landscapes
- Engineering & Computer Science (AREA)
- Emergency Management (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Business, Economics & Management (AREA)
- Ecology (AREA)
- Health & Medical Sciences (AREA)
- Public Health (AREA)
- Forests & Forestry (AREA)
- Biodiversity & Conservation Biology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Ventilation (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
- Respiratory Apparatuses And Protective Means (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
Description
- The invention relates to a system for exhausting and thereby carrying away flue gases and hot air from a fire in a tunnel via a damper into a discharge duct which extends in the tunnel, and through which the flue gases and the hot air are discharged, where the duct is provided with gates in the form of hinged doors which each are kept closed against a spring force by means of a lock with thermostatic release, so that a local temperature increase in the tunnel automatically releases the door or doors which are located above the scene of fire concerned.
- Tunnels are characterized by being elongated cavities which have an opening at both ends, and which have a cross-sectional area that is relatively small in relation to their length. In most tunnels, there is frequently a natural draught which ensures a reasonable supply of oxygen. Tunnels are frequently used for the transport of carriages, cars, trains, passengers, etc., or as passages for cables and other permanent installations. Frequently, tunnels contain large amounts of combustible substances.
- In connection with fires, the draught in the tunnel and the amount of fuel mean that a fire of relatively great intensity can easily occur. The hot fire gases can be distributed only over a relatively small cross-section in a elongated pipe, where a relatively large amount of air is to be moved to give room for the hot fire gases, and as a result of this the temperatures in the tunnel risk getting very high in connection with relatively small fires, which can therefore spread relatively rapidly and become very violent.
- Also, fire gases will rapidly fill the tunnel with thick and stifling gases which make it difficult to evacuate the tunnel in a fire and carry out a safe and efficient rescue operation.
- Extinguishing systems for fire fighting in tunnels based on the spreading of water or water mists have been developed and are installed in tunnels today. These systems are relatively expensive. They require supply of extinguishing medium, and, depending on the required water pressure and the required water amount, these systems also need a relatively great supply of energy.
- In connection with the evaporation of water in connection with the extinguishing with water, water vapour is produced, the oxygen potential in the tunnel air is reduced, the combustion of the combustion gases is reduced, and the temperature of the combustion gases is reduced. Condensation of water vapour in the tunnel causes the visibility to be reduced considerably. So does the increased amount of non-combusted fire gases, which also results in an increased concentration of stifling CO and Nx gases in the tunnel atmosphere, and the cooling of the fire gases causes the thermal buoyancy of the gases to be reduced, as a result of which these will fill the entire cross-section of the tunnel even for relatively short tunnels and corridors.
- Tunnels are frequently vented of car smoke, etc. by fans which are positioned close to the ceiling of the tunnel. Arranging them in rows near the ceiling ensures that the gases are conveyed away near the ceiling of the tunnel without too great mixing with the air which is present at lower levels in the tunnel cross-section.
- These systems are relatively inexpensive to install and are efficient against car smoke, but insufficient in case of tunnel fires with a much greater concentration of fire gases and water vapour, which, particularly in case of long tunnels, risk getting mixed with the rest of the air in the tunnel.
- It has been attempted to solve this by installing an extra tunnel ceiling above the tunnel ceiling proper, the space between the two ceilings being separated by a ceiling system with inclined slats. The angle of inclination of the slats may be adjusted to the direction of ventilation and in a few cases also the ventilation pressure and the air speeds. Smoke and gases, etc. may hereby be discharged from the utility cross-section of the tunnel and be discharged in the extra ceiling space without any mixing between the gases which are being discharged and the air in the utility tunnel.
- This method, too, requires a relatively great ventilating system and will have a relatively great power consumption because of the large amount of air which is to be transported in the relatively large cross-section of the ceiling space. Because of the cost of construction, etc., this solution is best suited for tunnels which have been designed in advance for this venting solution.
-
US 6 478 672 discloses a system for discharging flue gases comprising a duct which is provided with slats which may be remote-controlled so that a plurality of slats in the fire area may be pivoted to open, thereby providing a communication to the duct through which the flue gases may be exhausted. - For this system to operate, remote-controlled equipment has to be mounted, comprising signal generators to pivot the dampers, including a power supply for the pivoting mechanism of the dampers. This is therefore a relatively expensive system to manufacture and install, since it requires installation of remote signal generators, pivoting means for the dampers and associated power supply, wiring systems, etc.
-
FR 2 254 245 - According to this disclosure, the damper is kept in a closed position by means of two screw and nut connections to two arched slits and with a disc, made of a meltable material in each of the screw and nut connections. When the temperature rises above a chosen value, these discs will melt and leave the screw-nut connections loose and free to move in the arched slits, whereby the damper will move to the open position under the influence of the spring-loading.
- This configuration is complicated and it is a heavy process to reset the system, as every screw-nut connection must be removed and provided with a new meltable disc.
- The object of the invention is to make a system of the above-mentioned kind, which is less complicated, and where resetting to the closed position after releasing to open position is easy to accomplish.
- This is achieved according to the invention in that the lock comprises a pawl system, with at least one pawl slidable between a first position, in which it engages the end portion of the damper opposite the hinge to keep the damper closed, and a second position, in which the pawl or pawls are out of engagement with the damper so that the damper is free to swing to its open position, whereby the pawl system is spring-loaded towards the second position and is kept in the first position against the force of the spring-loading by a thermal release element.
- This system is simple as it comprises only few parts. It is easy to reset after operation, as it is only necessary to push the pawl system back against the spring force and place a new thermal release element in position, which can be accomplished easily and fast without need for dismounting anything. Furthermore, the movement of the pawl system can be used to operate or release other functions, so as ventilation or fire extinction or water mist systems, as the pawl system performs a simple linear movement during operation.
- The function of the opening of the individual damper plates will be autonomous, as only the most important dampers will open and only in dependence on the temperature which exists around the dampers concerned.
- This ensures that exhaustion will always take place in the hottest area and also that the ventilation, i.e. the exhaustion, will be effective, since the capacity is utilized fully to remove the dangerous gases concerned and the heat which are generated by a fire.
- When, as stated in
claim 2, the release mechanisms in the individual dampers also control the ventilation, the exhaustion may be optimized in response to the need. - When, as stated in
claim 3, the release mechanisms are used for signalling for fire fighting, such as activation of sprinkler and mist nozzles, the fire fighting will be concentrated to the zones where the fire is to be fought. - When, as stated in
claim 4, water mist is supplied to the hottest and most smoke-filled places in the duct, these will cool the gases, and the ventilation capacity is thereby increased, just as a certain precipitation of the smoke particles will take place in the water mist. - When, as stated in claim 5, the duct is cooled externally in the hot zone by means of water mist, the temperature in the duct maybe kept low.
- Finally, it is expedient, as stated in claim 6, to mount axial fans in the entire cross-section of the duct, since this makes it possible to generate a small positive pressure for effectively driving the gases through the duct.
- Examples of systems according to the invention will be described more fully below with reference to the drawing, in which
- Fig. 1
- shows a perspective view of a tunnel with an exhaustion system according to the invention,
- Fig. 2
- shows a section of the duct with a damper with a release mechanism,
- Figs. 3b-e
- show examples of release mechanisms according to the invention,
- Fig. 4
- shows a perspective view of a system with fire fighting equipment, and
- Fig. 5
- shows a system with water mist equipment.
-
Fig. 1 shows an example of a tunnel 1 in which an exhaustion system according to the invention is installed at the top, said system comprising aduct 2 which is provided with a plurality of openings withdampers 3, and which is provided withvent openings 4 which each are provided with suction fans (not shown). -
Fig. 2 shows a section of theduct 2 in the form of a sectional view with adamper 3 which is mounted on the side of theduct 2. - The
damper 3 is mounted by a bracket 7 with springing which acts on the damper with a constant spring force for opening, which will keep the damper open if it is not held back by a locking mechanism which, at a predetermined temperature, will be released thermally to open so that the spring-loadeddamper 3 will open automatically for passage to the interior of the duct. -
Fig. 2 shows an example of a locking mechanism consisting of apawl system 10 which is kept in its locked position by a release element 11, and wheresprings 9 are mounted such that these springs pull thepawls 10 back when the thermal release element 11 is released, whereby the damper will open automatically. - The thermal release element 11 may be a liquid-filled glass ampoule, a meltable member, a bimetallic member or a piece of alloyed material and the like.
- The
duct 2 is thermally insulated 8 so that heating from the hot fire gases inside and outside and in particular heating of the air in the duct is reduced. -
Fig. 3b shows an example of an embodiment of the locking mechanism, where it is affected for release by acompression spring 15. -
Fig. 3c shows an example of a mechanism which is heat-released by a thermal release element, which is released electrically by means of adetonator 12 consisting of a pyrotechnical charge which affects a piston or other device, which removes the thermal release element 11 when the pyrotechnical charge is ignited by an electrical pulse, whereby the lockingpawl 10 is released. -
Fig. 3d shows an example of a mechanism which activates anelectrical switch 13 when the thermal element 11 is released so that it may be used for electrical control of e.g. fans in the duct or similar extra equipment, which will be described later. -
Fig. 3e shows a mechanism where thepawl system 10 affects a hydraulic or pneumatic valve 14 so that this automatically opens or closes when the pawl is activated. This may be used for automatically activating extinction systems and/or cooling systems independently of electrical connections, as will be described later. -
Fig. 4 shows an example of a tunnel 1 in which a venting duct system corresponding to the one shown infig. 1 and a fire fighting system are installed, which may be a water and/or foam-based sprinkler system with open sprinklers, or a water mist system with or without addition of additives to the water supply. - The fire fighting system consists of a water supply which, in the case shown, is in the form of a
reservoir 18, a pump system 17 and one ormore supply pipes 16, which are connected with abranch pipe 19 connected via avalve 21 with one or more nozzle pipes withopen nozzles 20, which for each branch pipe covers a predetermined area of the tunnel in which the fire zone is present. - Supply pipes and branch pipes may be pressurized, and the
valves 21 prevent liquid from reaching the nozzles, or branch pipes and supply pipes may be without pressure and be pressurized only when the heat from a fire releases one or more of the locking mechanisms and thereby activates a switch which opens thedampers 3 above the fire and simultaneously open the valve closest to theopen damper 21 and the twoadjacent valves 21 and starts the pump 17, if this is not started automatically by a pressure drop in thesupply pipe 16. -
Fig. 5 shows a tunnel 1 corresponding to the one shown infig. 1 , where a water cooling system and a drain system for the plant are installed. The water cooling system is typically a water mist system which distributes a water mist 23 in theduct 3. The water cooling system comprises awater supply 28 for one ormore nozzle pipes 27, on which a plurality ofwater mist nozzles 32 inside theduct 2 are mounted, and which are distributed in the entire length of the duct. - The water cooling system may have nozzles which are closed by a thermal release element, and which open individually when it is subjected to a temperature higher than a predetermined release temperature of the release element, or it may consist of open nozzles which automatically distribute water mist when they are pressurized with water. Valves and water supply for the water cooling system may be activated automatically when a locking mechanism, as shown in
figs. 2 and 3 , is activated. - The system pipe is provided with
drain pipes 25 on which a drain valve is mounted, which may consist offlap 29 affected by aspring 30 such that the flap is kept closed against thedrain pipe 25, whereby supply of air to the duct from the drain pipe may be prevented. When thedrain pipe 25 is filled with water, the force F on theflap 29 becomes greater than the closing force, and the water may be drained from the drain pipe, the water in the drain pipe serving at the same time as a plug preventing air from being admitted into theduct 2 from the drain pipes. - The mode of operation will be described now.
- In case of a fire in the tunnel, the hot flue gases from a fire will ascend and surround the duct over the scene of fire. When the temperature of the hot fire gases locally reaches the release temperature of the thermal release elements 11, the heat-sensitive release element or elements 11 are released locally, whereby the locking mechanism for the dampers automatically opens on the dampers which are present in the heat-affected area.
- The fans are started at the same time, which are present in the duct system, and which will be mounted inside the duct in very long tunnels. A particularly efficient ventilation may be achieved by installing axial fans which cover the entire cross-sectional area of the tunnel, thereby increasing the efficiency and allowing a small positive pressure to be established in the duct for effective driving-off of the flue gases.
- The fans may be activated automatically by means of a switch mounted on the thermal locking device on the individual dampers.
- A simple exhaustion systems for mounting in tunnels is established in the same manner. The system carries away only the hot flue gases from the scene of fire, which reduces the requirement with respect to the capacity of the ventilation and thereby also the power consumption of the system.
- The invention moreover ensures physical separation between the hot fire gases and the utility air in the tunnel. Therefore, it may advantageously be combined with an active water mist or sprinkler extinction system, thereby ensuring improved visibility and air quality in the tunnel during a fire.
- This facilitates the evacuation and the fire fighting work. The system also reduces the possibilities of flashover and thereby a tendency of fire spreading in the tunnel, since the hot fire gases are driven-off and cooled.
- A special variant of the invention is when the system comprises an internal water cooling system, where the hot gases in the vent pipe are cooled by a water mist which binds the particles of the fire gases to the water, whereby this water may be drained automatically via drain pipes on which drain valves are mounted for automatic draining of the system.
- In connection with long tunnels, a special variant of the invention is a system with internal water mist cooling and cleaning of the fire gases which may be combined with axial venting in the tunnel ceiling, so that the individual length of the duct sections may be reduced and the venting from these is partially taken over by venting systems already installed.
Claims (6)
- A system for exhausting and thereby carrying away flue gases and hot air from a fire in a tunnel via a damper into a discharge duct which extends in the tunnel, and through which the flue gases and the hot air are discharged, where the duct is provided with gates in the form of hinged doors which each are kept closed against a spring force by means of a lock with thermostatic release, so that a local temperature increase in the tunnel automatically releases the door or doors which are located above the scene of fire concerned, characterized in that the lock (9 - 11) comprises a pawl system, with at least one pawl (10) slidable between a first position, in which it engages the end portion of the damper opposite the hinge to keep the damper closed, and a second position, in which the pawl or pawls are out of engagement with the damper, so that the damper is free to swing to its open position, whereby the pawl system is spring loaded (15) towards the second position and is kept in the first position against the force of the spring-loading by a thermal release element (11).
- A system according to claim 1, characterized in that the release mechanism simultaneously activates the ventilation to ensure sufficient exhaustion.
- A system according to claim 1 or 2, characterized in that the release mechanism simultaneously releases an extinction system at the location concerned in the tunnel (1).
- A system according to claims 1-3, characterized in that the release mechanism simultaneously activates a water mist system (27, 32) for cooling the gases and the air in the duct (2) by spreading water mist (33) in the duct (2).
- A system according to claims 1-4, characterized in that the release mechanism simultaneously activates a water mist system for cooling the external parts of the duct (2) by means of water mist.
- A system according to any one of claims 1-5, characterized in that the ventilation takes place by means of axial fans mounted in the duct (2), said fans essentially filling the entire cross-sectional area of the duct (2).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DK200301859 | 2003-12-16 | ||
DKPA200301859 | 2003-12-16 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP1544408A1 EP1544408A1 (en) | 2005-06-22 |
EP1544408B1 true EP1544408B1 (en) | 2008-04-23 |
Family
ID=34485970
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP04388091A Not-in-force EP1544408B1 (en) | 2003-12-16 | 2004-12-16 | A system for exhausting flue gases in a tunnel |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1544408B1 (en) |
AT (1) | ATE393300T1 (en) |
DE (1) | DE602004013260T2 (en) |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2891612B1 (en) * | 2005-10-05 | 2007-12-28 | Patrick Kalb | BLOW-ON AND RETRACTABLE DUE-DUMPING DUCTING CONDUIT |
CA2735062A1 (en) * | 2008-08-22 | 2010-02-25 | Ansaldo Sts S.P.A. | Ventilation system for railway tunnels |
ITAN20090069A1 (en) * | 2009-09-29 | 2011-03-29 | Elena Bricca | PLANT FOR THE SAFETY OF ROAD TUNNELS IN THE EVENT OF FIRE. |
SI2598718T1 (en) | 2010-07-27 | 2015-02-27 | Josip Pavetic | Method and system for tunnel ventilation in normal conditions and in conditions of fire |
CN103267335B (en) * | 2013-04-26 | 2015-08-19 | 西安建筑科技大学 | Horizontal vertical is blown the respiratory region head-on collision air-supply tunnel fire hazard escape system combined |
NO337239B1 (en) | 2013-12-06 | 2016-02-22 | Storroesaeter Rune | System and method for extracting smoke from road tunnels |
EP3160597B1 (en) | 2014-06-25 | 2023-11-08 | Micheletti Engineering & Consulting Sagl | System for filtering the fresh air flowing in a tunnel and/or the exhaust gases flowing out therefrom |
CN108757033A (en) * | 2018-06-04 | 2018-11-06 | 中铁第四勘察设计院集团有限公司 | A kind of protection door system with ventilation equipment |
CN109113785A (en) * | 2018-09-29 | 2019-01-01 | 中国矿业大学 | A kind of safe air-taking system of coal mine wind-lack gas |
CN110344871B (en) * | 2019-07-01 | 2020-12-04 | 滨州富创科技服务有限公司 | Rail tunnel fire extinguishing vehicle |
CN113058180B (en) * | 2021-03-23 | 2021-10-22 | 中国科学技术大学 | Staged fire extinguishing and rescuing system and method for high-altitude tunnel |
CN115822640B (en) * | 2022-11-04 | 2023-11-28 | 中国科学院西北生态环境资源研究院 | Frozen soil tunnel portal protection system |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3543439A (en) * | 1968-10-07 | 1970-12-01 | Frederick William Pantland | Fire dampers |
FR2254245A5 (en) * | 1973-12-07 | 1975-07-04 | Sofrair | Tunnel escape system for smoke or fumes - has temperature responsive escape flaps with fusible locking washers |
DE3117147A1 (en) * | 1981-04-30 | 1982-11-18 | Daimler-Benz Ag, 7000 Stuttgart | Road tunnel with forced ventilation |
US4898088A (en) * | 1989-02-02 | 1990-02-06 | Norman Lesser | Totally fusible tunnel ventilation damper system |
DE19825420C2 (en) * | 1998-06-06 | 2000-03-30 | Hartmut Ewald | Process and device for smoke and heat extraction and for operating ventilation for traffic structures and rooms |
ES2206122T3 (en) * | 1999-10-11 | 2004-05-16 | Liederer + Partner Gmbh | FIRE PROTECTION DEVICE FOR TUNNELS. |
HRP990415A2 (en) * | 1999-12-30 | 2001-08-31 | Pavetić Josip | Process of ventilation of road tunnels |
NL1019389C2 (en) * | 2001-11-16 | 2003-05-20 | Trelleborg Bakker B V | Tunnel is provided with devices for separating it into at least two successive longitudinally extending segments which are for thermic insulation of fire source in one of them |
-
2004
- 2004-12-16 EP EP04388091A patent/EP1544408B1/en not_active Not-in-force
- 2004-12-16 DE DE602004013260T patent/DE602004013260T2/en not_active Expired - Fee Related
- 2004-12-16 AT AT04388091T patent/ATE393300T1/en not_active IP Right Cessation
Also Published As
Publication number | Publication date |
---|---|
ATE393300T1 (en) | 2008-05-15 |
EP1544408A1 (en) | 2005-06-22 |
DE602004013260D1 (en) | 2008-06-05 |
DE602004013260T2 (en) | 2009-06-25 |
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