Urban underground space clean ventilation duct threshold-free double-leaf flood-proof protective closed door

Abstract

A double-leaf flood-proof protective closed door without a threshold for a clean ventilation duct in an urban underground space, comprising: a door frame and a door leaf, the door leaf is arranged on the door frame through a liftable door shaft system; a locking system, the locking system is used to realize the locking of the door leaf on the door frame; an explosion-proof valve system, the explosion-proof valve system includes an explosion-proof valve assembly for installation on the vent and a small electric protective closed door arranged on the door leaf for closing the vent; a small flood-proof door system. The present invention is aimed at underground traffic tunnels and takes into account the defense requirements of civil air defense projects. According to the size characteristics of the openings of existing buildings, slope requirements and functional requirements, new protective equipment research and design are carried out, which at least includes the following beneficial effects: the door leaf of the present invention can be lifted and lowered, which can meet the requirements for opening and closing the door leaf at the ramp, especially for opening in the uphill direction. The door leaf can be lifted up by the door shaft system before or during opening, and its operation is simple and the conversion time is short.

Description

Technical Field

[0001] The present invention relates to the technical field related to flood-proof protective doors, and more specifically, to a double-leaf flood-proof protective closed door without a threshold for a clean ventilation duct in an urban underground space. Background Art

[0002] Urban underground traffic tunnels are both civil air defense projects and should have traffic safety functions to ensure the evacuation of personnel and the transportation of materials. According to the requirements of the integration of peacetime and wartime functions, they can also be used as temporary shelters for personnel and materials.

[0003] Generally speaking, urban underground traffic tunnels should be designed as a protection unit in wartime, and their wartime functions should be designed as evacuation trunk roads to ensure the mobility of urban tunnels. The functional requirements of protective equipment in the relevant requirements are as follows: (1) Urban underground traffic tunnels that take into account civil air defense projects should meet the functional requirements of peacetime and wartime, and should follow the principle that the wartime functions are similar to the peacetime functions. (2) The protective closed doors at the entrance and exit ramps of urban underground traffic tunnels that take into account civil air defense projects should open outwards. When the slope of the entrance and exit ramps is inward, measures must be taken to ensure the normal opening of the door leaves; when the protective closed doors at the entrance and exit ramps open inwards, reverse force protective closed doors should be used; water collection wells and intercepting ditches should not be set up in the opening range of the protective closed door leaves, and pads that cannot be moved quickly should not be installed. (3) The ventilation design of urban underground traffic tunnels that take into account civil air defense projects should ensure wartime protection requirements and meet the use requirements in wartime and peacetime. Urban underground traffic tunnels that also take into account civil air defense projects should be equipped with independent ventilation systems according to the protection units. The system includes air intake and exhaust systems. The wartime ventilation system should be designed in combination with the peacetime ventilation system. When the peacetime use requirements are inconsistent with the wartime protection requirements, peacetime and wartime function conversion measures can be taken. Temporary personnel shelters should be equipped with clean ventilation and internal circulation ventilation for isolation protection. (4) The layout of outdoor entrances and exits, air inlets, and exhaust (smoke) outlets of urban underground traffic tunnels that also take into account civil air defense projects should comply with the use requirements in peacetime and wartime and the planning requirements of ground buildings. Outdoor entrances and exits should take flood prevention measures.

[0004] At present, the main problems of existing protective equipment used for the defense of the entrance of urban underground traffic tunnels are as follows: (1) There is no mature and standardized equipment that can simultaneously realize the functions of ventilation, protection, sealing, and flood prevention; (2) Based on the requirement of barrier-free passage, currently only the drop-type protective sealed door can realize the requirement of opening outward along the uphill direction. However, since the bottom of this type of equipment adopts a trench design and is sealed with a cover plate in normal times, this causes problems such as complex operation during peacetime and wartime conversion and long conversion time. At the same time, there is also a risk of the trench cover plate falling off, which poses a hidden danger to normal driving safety; (3) The existing clean ventilation protective sealed door uses a hose valve or a swing valve as a ventilation protection function module. Due to material problems, the hose valve is prone to aging and is not resistant to high temperatures. Due to its low wave absorption rate, the swing valve is prone to cause the residual pressure at the valve outlet to exceed the bearing capacity of the ventilation equipment and personnel; (4) The existing civil air defense equipment does not take flood prevention requirements into consideration when designing, and its sealing structure and sealing components cannot meet the flood prevention requirements under long-term water pressure. Summary of the invention

[0005] 1. Technical issues

[0006] In summary, how to provide a flood-proof and sealed door suitable for ramp applications while also having cleaning and ventilation functions has become an urgent problem to be solved by technical personnel in this field.

[0007] (II) Technical solution

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] The present invention provides a threshold-free double-leaf anti-flooding protective closed door for a clean ventilation duct in an urban underground space. In the present invention, the threshold-free double-leaf anti-flooding protective closed door for a clean ventilation duct in an urban underground space comprises:

[0010] A door frame and a door leaf, wherein the door leaf is arranged on the door frame through a liftable door shaft system to meet the installation requirements of the ramp entrance and exit, and a vent and a small door are arranged on the door leaf;

[0011] A locking system, the locking system being used to achieve locking of the door leaf on the door frame;

[0012] An explosion-proof valve system, the explosion-proof valve system comprising an explosion-proof valve assembly for installation on the vent and a small electric protective airtight door provided on the door leaf for closing the vent, the explosion-proof valve assembly being an assembled structure, and the explosion-proof valve assembly comprising an explosion-proof valve unit;

[0013] A small flood-proof door system comprises a small flood-proof door, which is hinged on the door leaf and airtightly closed on the small door opening.

[0014] Preferably, in the threshold-free double-leaf flood-proof and sealed door of the clean ventilation duct of the urban underground space provided by the present invention, the liftable door axis system includes a door axis, which is vertically arranged; a door frame assembly is arranged corresponding to the top end of the door axis, the door frame assembly is fixedly arranged on the door frame, and the door axis moves up and down relative to the door frame assembly; a door leaf assembly is arranged below the door frame assembly, the door leaf assembly is fixedly arranged on the door leaf, and a shaft platform is arranged on the door axis corresponding to the shaft section of the door leaf assembly, the door leaf assembly is arranged on the shaft platform and moves up and down with the door axis through the shaft platform; the door axis, the door frame assembly and the door leaf assembly form a liftable door axis unit, and at least two liftable door axis units are arranged, two of the liftable door axis units are vertically arranged and all of the door axis are coaxially arranged and fixedly connected by sleeves; and a hydraulic device for lifting the door axis is also included.

[0015] Preferably, in the threshold-free double-leaf flood-proof and sealed door of the clean ventilation duct of the urban underground space provided by the present invention, the door frame assembly includes a door frame mounting seat, a door frame mounting seat platform is arranged on the door frame mounting seat, the door frame mounting seat is fixedly arranged on the door frame, the door frame mounting seat platform is arranged horizontally, a sliding hole is arranged on the door frame mounting seat platform, the door shaft is slidingly matched with the sliding hole, a limiting roller assembly is arranged on the door frame mounting seat platform, and the limiting roller assembly is rollingly matched with the door shaft; the door leaf assembly includes a door leaf mounting seat, a plurality of bearing assemblies rotatably matched with the door shaft are arranged on the door leaf mounting seat, a door leaf connecting support arm is arranged on the door leaf mounting seat, and the door leaf connecting support arm is fixedly connected to the door leaf.

[0016] Preferably, the threshold-free double-leaf flood-proof protective closed door for the clean ventilation duct of the urban underground space provided by the present invention also includes a reinforced connection assembly, the reinforced connection assembly includes a reinforced connection arm, a reinforced support is arranged at the end of the reinforced connection arm, the reinforced support is used to be fixedly connected to the door leaf, and the reinforced connection arm is connected to the door shaft through a bearing; the reinforced connection assembly is provided in multiple groups and is arranged at intervals; corresponding to the same door shaft, a second group of door frame assemblies is arranged below the door leaf assembly, and the limiting roller assemblies arranged on the two door frame assemblies are arranged on both sides of the door shaft.

[0017] Preferably, in the threshold-free double-leaf flood-proof protective closed door for the clean ventilation duct in the urban underground space provided by the present invention, two small flood-proof doors are provided and are respectively hinged on both sides of the door leaf, and each of the two small flood-proof doors is provided with a small flood-proof door locking system.

[0018] Preferably, in the threshold-free double-leaf flood-proof protective closed door for the clean ventilation duct of the urban underground space provided by the present invention, the locking system includes a handwheel, a connecting rod subsystem connected to the handwheel and used to realize power output, a bottom latch assembly and a top latch assembly powered by the connecting rod subsystem; the door leaf is locked to the door frame at the top and bottom through the locking system.

[0019] Preferably, in the threshold-free double-leaf flood-proof protective closed door for the clean ventilation duct of the urban underground space provided by the present invention, the explosion-proof wave valve unit includes an air supply channel with two-way air supply, an activity space is provided in the air supply channel, and a wave-breaking pipe is provided in the activity space. When the air flow velocity in the air supply channel is not greater than a threshold value, the wave-breaking pipe is located in the activity space to realize the conduction of the air supply channel. When the air flow velocity in the air supply channel is greater than a threshold value, the wave-breaking pipe is moved in the activity space under the action of the air flow to close the air supply channel.

[0020] Preferably, in the threshold-free double-leaf flood-proof protective closed door of the clean ventilation duct of the urban underground space provided by the present invention, the explosion-proof wave valve unit includes a windward surface structure and a leeward surface structure, the windward surface structure is provided with two, the two windward surface structures are spaced apart in the vertical direction to form a front air supply channel, the leeward surface structure is provided with two, the two leeward surface structures are spaced apart in the vertical direction to form a rear air supply channel, the windward surface structure and the leeward surface structure are spaced apart in the air supply direction to form the activity space; mounting splints are provided on both sides of the windward surface structure and the leeward surface structure for realizing fixed mounting of the windward surface structure and the leeward surface structure, the two ends of the wave-breaking pipe are square tube structures and slidably cooperate with the mounting splints, the middle section of the wave-breaking pipe is a round tube structure, which abuts against the two windward surface structures or against the two leeward surface structures, and is used to close the front air supply channel or the rear air supply channel.

[0021] Preferably, in the threshold-free double-leaf flood-proof protective closed door for the clean ventilation duct of the urban underground space provided by the present invention, a small electric protective closed door system is also arranged on the door leaf, and the small electric protective closed door system includes a small electric protective closed door, and the small electric protective closed door is hinged on the door leaf. The small electric protective closed door system also includes a flipping and locking linkage system for the linkage of the flipping opening and locking actions of the small electric protective closed door.

[0022] Preferably, in the threshold-free double-leaf flood-proof protective closed door for the clean ventilation duct of the urban underground space provided by the present invention, two door leaves are provided, the two door leaves are of a double-leaf installation structure, the door leaves are of an uphill opening structure, a set of the explosion-proof valve system is provided on each of the two door leaves, and a set of the small flood-proof door system is provided on one of the door leaves.

[0023] (III) Beneficial effects

[0024] The present invention provides a double-leaf flood-proof protective closed door without a threshold for a clean ventilation duct in an urban underground space, specifically comprising: a door frame and a door leaf, wherein the door leaf is arranged on the door frame through a liftable door shaft system to meet the installation requirements of a ramp entrance and exit, and a vent and a small doorway are arranged on the door leaf; a locking system, wherein the locking system is used to realize the locking of the door leaf on the door frame; an explosion-proof valve system, wherein the explosion-proof valve system comprises an explosion-proof valve assembly for being installed on the vent and a small electric protective closed door arranged on the door leaf for closing the vent, wherein the explosion-proof valve assembly is an assembled structure, wherein the explosion-proof valve assembly comprises an explosion-proof valve unit, and the number of the explosion-proof valve units is adjustable; and a small flood-proof door system, wherein the small flood-proof door system comprises a small flood-proof door, wherein the small flood-proof door is hinged on the door leaf and can be airtightly closed to the small doorway. The present invention aims at underground traffic tunnels while taking into account the defense requirements of civil air defense projects, and carries out research and design of new protective equipment according to the size characteristics of the openings of existing buildings, slope requirements and functional requirements. Through the above-mentioned structural design, the threshold-free double-leaf flood-proof protective closed door for the clean ventilation duct in the urban underground space provided by the present invention has at least the following beneficial effects compared with the existing highway tunnel flood-proof door scheme: the door leaf in the present invention can be raised and lowered, which can meet the requirements for opening and closing the door leaf at the ramp, especially for opening in the uphill direction. The door leaf can be lifted up by the door axis system before or during opening, and its operation is simple and the conversion time is short. The present invention is in line with the defense requirements of the entrances of underground traffic tunnels while taking into account the defense requirements of civil air defense projects and the daily use requirements of tunnels. It can not only realize ventilation, flood prevention and protective sealing functions, but also reduce the types and number of defense equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. Among them:

[0026] Figure 1 It is a schematic diagram of the overall structure of a double-leaf anti-flooding protective closed door without a threshold for a clean ventilation duct in an urban underground space according to an embodiment of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the internal frame of the door leaf in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the structure of a door leaf in an embodiment of the present invention;

[0029] Figure 4 It is a structural schematic diagram of a small electric protective closed door system in an embodiment of the present invention;

[0030] Figure 5 It is a schematic diagram of the top view of the structure of a small electric protective closed door system in an embodiment of the present invention;

[0031] Figure 6 It is a structural schematic diagram of a liftable door shaft system in an embodiment of the present invention;

[0032] Figure 7 It is a schematic cross-sectional structure diagram of a liftable door shaft system in an embodiment of the present invention;

[0033] Figure 8 It is a structural schematic diagram of a locking system in an embodiment of the present invention;

[0034] Fig. 9 is a cross-sectional view of a locking system in an embodiment of the present invention;

[0035] Fig.10 for Fig. 9 A magnified schematic diagram of the structure in the middle box;

[0036] Fig.11 It is a schematic diagram of the side structure of the bottom beam assembly in an embodiment of the present invention;

[0037] Fig.12 It is a front structural schematic diagram of the bottom beam assembly in an embodiment of the present invention;

[0038] Fig.13 It is a schematic structural diagram of a small flood prevention door in an embodiment of the present invention.

[0039] exist Figures 1 to 13 In the figure, the corresponding relationship between the component names and the reference numerals is as follows:

[0040] Door frame 1, door leaf 2, vent 3, small doorway 4, explosion-proof valve assembly 5, small electric protective closed door 6, small flood-proof door 7, door shaft 8, door frame assembly 9, door leaf assembly 10, sleeve 11, hydraulic device 12, limit roller assembly 13, reinforced connection assembly 14, hand wheel 15, connecting rod subsystem 16, bottom latch assembly 17, top latch assembly 18, bottom beam 19, operating device 20, commutator 21, motor equipment 22, rotating shaft 23, slider 24, steering member 25. DETAILED DESCRIPTION

[0041] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments. Each example is provided by way of explanation of the present invention and does not limit the present invention. In fact, it will be clear to those skilled in the art that modifications and variations may be made in the present invention without departing from the scope or spirit of the present invention. For example, a feature shown or described as a part of one embodiment may be used in another embodiment to produce yet another embodiment. Therefore, it is desired that the present invention encompasses such modifications and variations within the scope of the appended claims and their equivalents.

[0042] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on the present invention. The terms "connected" and "connected" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0043] Please refer to Figures 1 to 13 .

[0044] The present invention provides a threshold-free double-leaf flood-proof protective closed door for a clean ventilation duct in an urban underground space. The threshold-free double-leaf flood-proof protective closed door for a clean ventilation duct in an urban underground space (hereinafter referred to as a protective closed door) provided by the present invention has the following characteristics: 1. It is applied to urban underground spaces; 2. It is arranged at the ramp of an underground passage, and the door leaf 2 opens in an uphill direction; 3. It adopts a double door leaf structure and is opened in a double-opening manner; 4. It has a clean passage structure.

[0045] The technical indicators of the present invention are as follows: 1. Door hole size (width × height): 9000 × 5000mm; 2. Design load: nuclear weapon protection level 6, conventional weapon protection level 6; 3. Sealing performance: at an overpressure of 50Pa, the maximum allowable air leakage Qy≤5.28m³ / h; 4. Ventilation performance: when the ventilation resistance of the door leaf valve group is ≤250Pa, the ventilation volume of the door leaf valve group is ≥20000m³ / h; 5. The ventilation conversion device can be opened and closed manually and electrically; 6. Conversion time for peacetime and wartime functions: when there are no less than 4 operators, or no less than 2 operators for each door, ≤20 minutes; 7. Usage function: the road surface adopts a threshold-free and trench-free structure to achieve barrier-free passage; 8. Flood prevention function: flood prevention head ≤15 meters; 9. Adaptation to civil engineering conditions: longitudinal slope ≤3%, and the door opens in the uphill direction.

[0046] The research and development scheme of the present invention mainly includes the following points: 1. The lifting hinge (that is, the liftable door shaft system in the present invention) is used to solve the influence of the road slope on the opening and closing of the door leaf 2; 2. The lifting sealing beam (that is, the bottom beam assembly arranged on the door leaf 2 in the present invention, wherein the bottom beam 19 can move up and down) is adopted to realize the bottom sealing and load-bearing; 3. The lifting sealing beam is linked with the locking system; 4. The liftable door shaft system can meet the lifting requirements of the door leaf; 5. The sealing structure (the sealing structure is specifically a structure with a sealing function in the present invention, such as the setting of a small electric protective sealed door, the setting of a bottom beam assembly, etc.) and the rubber strip (the rubber strip is used to increase the sealing) meet the flood prevention requirements; 6. The explosion-proof valve system is adopted.

[0047] The protective closed door provided by the present invention includes a door frame 1 and a door leaf 2. The door frame 1 is assembled from steel sections, and the various steel sections constituting the door frame 1 are installed on an existing building (the existing building refers to the concrete structure of the tunnel entrance) by anchoring. A reinforcing steel plate (the reinforcing steel plate is welded to the door frame 1) is arranged at the position of the door frame 1 for installing the hinge assembly (the door leaf 2 is installed through the hinge assembly), thereby improving the local structural strength of the door frame 1 and ensuring the reliability of the installation of the hinge assembly. The door leaf 2 adopts a beam-plate structure, that is, after the overall thickness of the door leaf 2 is designed by simulation, a suitable door beam and door plate are selected. The door beam constitutes the main structure of the door leaf 2, and the door beam is the core structure for impact resistance. The door plate is arranged on the outside of the door beam, which can not only ensure the airtightness of the door leaf 2, but also improve the impact resistance of the door leaf 2. The door leaf 2 is designed to be two, and the two door leaves 2 open opposite to each other. For one door leaf 2, the thickness of the door panel is 8mm, and the door beam is made of 32a I-beam steel. The door beam includes a main beam (vertical beam) and a secondary beam (cross beam). The main beam is vertically arranged, and the secondary beam is arranged between two adjacent main beams. The spacing between the main beams is 550mm, and the spacing between the secondary beams is 700mm. The maximum stress of the panel is 158MPa, the maximum stress of the main beam is 148MPa, the maximum shear stress of the main beam is 76MPa, and the maximum deflection of the main beam is 10.3mm. A locking system is arranged on the door leaf 2, and the locking system includes a lock (a lock box is matched with the lock, and the lock is installed on the door leaf 2, and the lock box can be installed on the door frame 1). The lock is designed to be 4 at the top and 8 at the bottom. The diameter of the upper lock is 80mm, and the diameter of the lower lock is 60mm. The maximum combined stress of the lock is 218MPa. The door leaf 2 is arranged on the door frame 1 through a liftable door axis system to meet the installation requirements of the ramp entrance and exit. The door leaf 2 is provided with a vent 3 and a small door 4. The door frame 1 is fixedly installed relative to the existing building. The door leaf 2 is installed on the door frame 1 through a liftable door axis system. The door leaf 2 can be lifted relative to the door frame 1 to meet the ramp installation requirements. The door leaf 2 is provided with a vent 3 (for clean ventilation) and a small door 4 (for rapid passage of a single person or a small number of people). After the vent 3, the small door 4, the locking system and other structures are designed, the layout of the main beam and the secondary beam of the door leaf 2 is designed, and then the main beam and the secondary beam are assembled to form the main structure of the door leaf 2.

[0048] In order to meet the anti-corrosion performance requirements in the high-salt and high-humidity environment of coastal areas, for equipment coatings, the present invention provides an epoxy anti-corrosion coating or POZD high-performance anti-corrosion coating spraying solution.

[0049] The door leaf 2 is composed of a beam and a plate structure. After the beam structure and the plate structure are assembled, the air tightness and structural strength of the entire door leaf 2 should be ensured, so as to meet the impact resistance and air tightness requirements of the door leaf 2. In addition, the present invention provides a rubber sealing structure on the door leaf 2 and / or the door frame 1, and after the door leaf 2 is closed, the rubber sealing structure can achieve an airtight closure with the door frame 1.

[0050] The door frame 1 provided by the present invention is a door frame structure without a threshold. In order to meet the sealing requirements of the bottom of the door leaf 2, the present invention is provided with a movable bottom beam assembly on the door leaf 2, and the bottom beam assembly includes a bottom beam 19 that can be movably installed on the door leaf 2 up and down, and an operating device 20 for controlling the movement of the bottom beam 19 (including a wrench or an electric device, the wrench or the electric device is dynamically connected with the bottom beam 19 through a connecting rod, a limit device, etc., so as to independently control the up and down movement of the bottom beam 19 to achieve the bottom sealing of the door leaf 2), and the inner side surface of the bottom beam 19 (the side facing the door leaf 2), the bottom surface of the bottom beam 19 and the two ends of the bottom beam 19 are all provided with sealing structures (end seals located at the two ends of the bottom beam 19, the bottom seal located at the bottom surface of the bottom beam 19 and the front side seal located at the front side of the bottom beam 19), which can be sealed and connected with the ground (or the buried door frame 1, or the buried plate, etc.), the door leaf 2, the edge of the door frame 1 and the two bottom beams (two door leaves 2 are provided, and each door leaf 2 is provided with a bottom beam assembly) after the bottom beam 19 is lowered. Furthermore, both ends of the bottom beam 19 are designed with an inclined surface structure, which can increase the contact area between the end of the bottom beam 19 and other structures and improve the sealing performance.

[0051] Since the protective closed door structure provided by the present invention is relatively large in size, the rubber sealing structure must be able to withstand the impact when the door leaf 2 is closed, and must also be able to ensure that it provides reliable sealing. In a preferred embodiment of the present invention, the rubber sealing structure includes a connecting portion and a sealing deformation portion, the connecting portion is a rubber flat plate, the rubber sealing structure is fixedly installed on the door frame 1 or the door leaf 2 through the connecting portion, and a sealing deformation portion is provided on the outer side surface of the connecting portion (the inner side surface is fixedly connected to the door frame 1 or the door leaf 2 after it abuts against it), and the sealing deformation portion is a hollow circular tube structure, which can be deformed (flattened) under pressure to achieve sealing.

[0052] The locking system is used to lock the door leaf 2 on the door frame 1. The locking system includes a hand wheel 15, a connecting rod subsystem 16 connected to the hand wheel 15 and used for power transmission, a bottom latch assembly 17 and a top latch assembly 18 connected to the connecting rod subsystem 16; the door leaf 2 is locked to the door frame 1 at the top and bottom through the locking system.

[0053] In the present invention, the locking system is a concealed locking system, that is, the locking system is installed inside the door leaf 2. The locking system includes a hand wheel 15 (an electric mechanism, such as a reduction motor, may also be used), the hand wheel 15 is rotatably mounted on the door leaf 2, a connecting rod subsystem 16 is arranged inside the door leaf 2, and the connecting rod subsystem 16 includes a commutator 21 used in conjunction with the hand wheel 15 (the commutator 21 is fixedly installed inside the door leaf 2 through a support and other structures), and the commutator 21 can commutate the rotational motion output by the hand wheel 15. The commutator 21 has one output end or two output ends, and can realize a single output or a double output of the rotational motion. The commutator 21 can be a common commutator or a reduction commutator, which is used to realize a 90° commutation of the rotational motion. The commutators 21 are connected by a coupling shaft. The type and quantity of the commutator 21 are designed according to the setting position and number of the lock heads, and the setting position of the commutator 21 is designed to meet the linkage of each lock head. In a preferred embodiment of the present invention, the lock is divided into a bottom latch assembly 17 and a top latch assembly 18. The bottom latch assembly 17 includes a plug-in lock, which is connected to the output end of the commutator 21 through a screw sleeve assembly, the output end of the commutator 21 is connected to a screw (sleeve), the plug-in lock is connected to the sleeve (screw) (connected by a pin shaft), and the rotational motion output by the commutator 21 is converted into linear motion by the screw sleeve assembly, thereby driving the plug-in lock of the bottom latch assembly 17 to move. The top latch assembly 18 includes a lever seat, a lever is hinged on the lever seat, the top latch assembly 18 is connected to the commutator 21 through a screw sleeve assembly, the output end of the commutator 21 is connected to a screw (sleeve), one end of the lever is connected to the sleeve (screw) (connected by a pin shaft), the rotational motion output by the commutator 21 is converted into linear motion by the screw sleeve assembly, thereby driving the lever to move, and a lock is provided at the other end of the lever, and the lever movement can drive the lock to move. When the number of the bottom latch assemblies 17 is greater than that of the top latch assemblies 18 , the plurality of bottom latch assemblies 17 will be linked via a linkage beam.

[0054] The door leaf 2 provided by the present invention is relatively large in size (as can be seen from the above, the door hole size is 9000×5000mm). In order to facilitate the rapid passage of a single person, the present invention also provides a small flood-proof door system, which includes a small flood-proof door 7, which is hinged on the door leaf 2 and can be airtightly closed to the small door 4. The small flood-proof door 7 is arranged on the door leaf 2 on one side (two door leaves 2 are arranged, and the small flood-proof door 7 is arranged on only one door leaf 2), and two small flood-proof doors 7 are arranged and respectively hinged on both sides of the door leaf 2 (both sides of the single-side door leaf 2), and each of the two small flood-proof doors 7 is provided with a small flood-proof door locking system. The small flood-proof door 7 includes a main door body (welded from steel profiles), a panel is arranged on the outer side of the main door body, and the edge of the panel extends outward relative to the main door body. After the small flood-proof door 7 is closed, the edge of the panel can be abutted against the panel of the door leaf 2, and a sealing ring is arranged at the position where the door leaf 2 contacts the edge of the panel of the small flood-proof door 7, so that the airtight closure of the small flood-proof door 7 on the door leaf 2 can be achieved. A wrench-type door lock is arranged on the small flood-proof door 7, and the wrench-type door lock is provided with a wrench and a lock head, and the lock head is directly controlled to be closed by the wrench. Furthermore, the present invention is provided with an annular boss structure on the inner side of the small door 4, and a second layer of sealing ring is arranged on the annular boss structure. The inner side of the small flood-proof door 7 can be abutted against the second layer of sealing ring to achieve secondary sealing after the small flood-proof door 7 is closed. Two small anti-flooding doors 7 are arranged on the small door opening 4 of the door leaf 2, and two small anti-flooding doors 7 are sealed twice with the door leaf 2. Therefore, the present invention arranges a total of four sealing structures on the small door opening 4, which can greatly improve the airtightness of the small door opening 4 on the door leaf 2 after closing.

[0055] In the present invention, two door leaves 2 are provided, and the two door leaves 2 are of a split installation structure. The two door leaves 2 are split left and right, and the door leaves 2 are of an opening structure in an uphill direction. During the opening process of the door leaves 2, the ground is an uphill surface, that is, the ground gradually rises. In order to avoid the slope from affecting the opening of the door leaves 2, the door leaves 2 should be raised before opening. Therefore, the present invention provides a liftable door axis system, and the lifting and lowering of the door leaves 2 is achieved through the liftable door axis system. In addition, in order to achieve the clean ventilation of the present invention, the present invention also provides an explosion-proof valve system on the door leaves 2. In addition to achieving ventilation through the explosion-proof valve system, the impact of the explosion shock wave can also be effectively reduced. Specifically, a set of explosion-proof valve systems is provided on each of the two door leaves 2, so that the ventilation volume can be guaranteed.

[0056] As one of the key improved technologies of the present invention, the present invention provides an explosion-proof wave valve system, wherein the explosion-proof wave valve system includes an explosion-proof wave valve assembly 5 for installation on the vent 3 and a small electric protective sealed door 6 arranged on the door leaf 2 for closing the vent 3. The explosion-proof wave valve assembly 5 is an assembled structure, and the explosion-proof wave valve assembly 5 includes an explosion-proof wave valve unit, and the number of explosion-proof wave valve units is adjustable.

[0057] Specifically, the explosion-proof wave valve unit includes an air supply channel that can supply air in both directions, an activity space is arranged in the air supply channel, and a wave-breaking pipe is arranged in the activity space. When the air flow velocity in the air supply channel is not greater than a threshold value, the wave-breaking pipe is located in the activity space to realize the conduction of the air supply channel. When the air flow velocity in the air supply channel is greater than the threshold value, the wave-breaking pipe can be moved in the activity space under the action of the air flow to close the air supply channel. The explosion-proof wave valve unit includes a windward surface structure and a leeward surface structure. There are two windward surface structures, which are spaced apart in the vertical direction to form a front air supply channel. There are two leeward surface structures, which are spaced apart in the vertical direction to form a rear air supply channel. The windward surface structure and the leeward surface structure are spaced apart in the air supply direction to form an activity space. Mounting clamps are provided on both sides of the windward surface structure and the leeward surface structure to achieve fixed installation of the windward surface structure and the leeward surface structure. Both ends of the wave-breaking pipe are square tube structures and slidably cooperate with the mounting clamps. The middle section of the wave-breaking pipe is a round tube structure, which can be abutted against the two windward surface structures or against the two leeward surface structures to close the front air supply channel or the rear air supply channel.

[0058] The explosion-proof valve unit is composed of aluminum alloy, stainless steel or hot-dip galvanized metal material structural parts, so that the entire explosion-proof valve unit has good high temperature resistance, corrosion resistance and durability, and can also achieve maintenance-free during the life of the equipment. The explosion-proof valve assembly 5 is composed of a plurality of explosion-proof valve units, and the number of explosion-proof valve units is adjustable (the number can be adjusted according to the height size of the vent 3, so that the vent 3 can be completely filled). The structural design can be based on the wartime ventilation volume requirements and the beam grid layout of the door leaf 2. In addition, the present invention is a valve structure, and the wave-breaking pipe can swing and quickly close the air supply channel. It not only has a high wave-breaking rate, but also a fast reaction speed. According to experimental measurements, after the explosion-proof valve unit is used in the present invention, its pressure peak wave-breaking rate is 91%, the energy wave-breaking rate is greater than 99%, and the residual pressure after the valve is less than 0.03MPa. The present invention can also directly install an oil mesh dust filter after the valve (the oil mesh dust filter can withstand a residual pressure of less than 0.05MPa).

[0059] The windward surface structural member and the leeward surface structural member have similar structures. The windward surface structural member is used as an example for explanation: the windward surface structural member is a long strip structural member with a U-shaped cross section. The windward surface structural member is arranged horizontally, and its opening (the U-shaped opening) is arranged inwardly. There are two windward surface structural members, which are arranged up and down. The lower plate of the windward surface structural member located at the upper part and the upper plate of the windward surface structural member located at the lower part are arranged at intervals to form a front air supply channel. Similarly, the leeward surface structural member is a long strip structural member with a U-shaped cross section. The leeward surface structural member is arranged horizontally, and its opening (the U-shaped opening) is arranged inwardly. There are two leeward surface structural members, which are arranged up and down. The lower plate of the leeward surface structural member located at the upper part and the upper plate of the leeward surface structural member located at the lower part are arranged at intervals to form a rear air supply channel. The upper and lower opening heights of the front air supply channel are consistent with the upper and lower opening heights of the rear air supply channel. The upper windward surface structure is opposite to the upper leeward surface structure and is spaced apart. The lower windward surface structure is opposite to the lower leeward surface structure and is spaced apart. A wave-breaking pipe is movably arranged between the windward surface structure and the leeward surface structure. The wave-breaking pipe can be offset against the windward surface structure or the leeward surface structure to close the front air supply channel or the rear air supply channel. Regardless of whether the front air supply channel or the rear air supply channel is closed, the entire air supply channel will be in a cut-off state and air flow cannot be achieved. In the event of high-intensity impacts such as explosions, shock waves are eliminated. The explosion-proof wave valve unit is an integral component. Then, according to the installation situation (such as whether there is a gap at the edge), a metal frame structure such as a mounting frame is set to install the explosion-proof wave valve unit on the vent 3 of the door leaf 2.

[0060] A small electric protective airtight door system is also provided on the door leaf 2, and the small electric protective airtight door system includes a small electric protective airtight door 6, and the small electric protective airtight door 6 is hinged on the door leaf 2. The small electric protective airtight door system also includes a flipping (flipping means that the small electric protective airtight door 6 flips relative to the door leaf 2) and locking linkage system, which is used for the linkage of the flipping opening and locking actions of the small electric protective airtight door 6. The flipping and locking linkage system includes a bracket fixedly provided on the door leaf 2, a motor device 22 is provided on the bracket, a rotating shaft 23 is installed on the motor shaft of the motor device 22, and the rotating shaft 23 is rotatably provided on the door leaf 2. The small electric protective airtight door 6 is installed on the door leaf 2 through a support arm and a hinge seat (fixedly provided on the door leaf 2), one end of the support arm is fixedly connected to the small electric protective airtight door 6, and the other end of the support arm is connected to the hinge seat. A slider 24 and a steering member 25 are provided on the small electric protective airtight door 6. The rotating shaft 23 is connected to the slider 24 through a rotating arm and a connecting rod. The rotating shaft 23 rotates through the rotating arm and the connecting rod to drive the slider 24 to slide along the slide rail on the small electric protective airtight door 6. The slider 24 and the steering member 25 are connected through a connecting rod mechanism. The sliding motion of the slider 24 is converted into a rotating motion through the steering member 25. The steering member 25 then converts its rotating motion into a linear motion through a multi-link mechanism, thereby driving the lock to move. A limiter is provided corresponding to the movement limit position of the slider 24 (i.e., when the lock is fully opened), so that the linear motion of the slider 24 stops. At this time, the rotating shaft 23 continues to rotate to drive the small electric protective airtight door 6 to open through the slider 24. When the small electric protective airtight door 6 is closed, the force required for the closing action of the small electric protective airtight door 6 is made smaller than the force required for the movement of the slider 24 by increasing the motion damping of the slider 24 (or the motion resistance of other movable parts). When the shaft 23 rotates in the opposite direction, the small electric protective airtight door 6 will be driven to close first. When the small electric protective airtight door 6 is closed and cannot move further, the force applied by the shaft 23 overcomes the motion resistance of the slider 24 so that the slider 24 moves and then realizes the locking action. After the locking is locked in place, the slider 24 cannot move further, and the entire closing action is completed. The present invention can realize a set of power devices to complete the opening or closing of the small electric protective airtight door 6 and the action drive of the lock through the above-mentioned structural design.

[0061] As the second key improvement technology of the present invention, the present invention provides a liftable door shaft system, which can realize the installation of the door leaf 2 on the door frame 1 and the lifting and lowering of the door leaf 2 relative to the door frame 1. The liftable door shaft system includes a door shaft 8, which is vertically arranged. A door frame assembly 9 is arranged at the top corresponding to the door shaft 8, and the door frame assembly 9 is fixedly arranged on the door frame 1. The door shaft 8 can move up and down relative to the door frame assembly 9. The door frame assembly 9 is a metal component. The door frame assembly 9 includes a door frame mounting seat, and a door frame mounting seat platform is arranged on the door frame mounting seat. The door frame mounting seat is fixedly arranged on the door frame 1, and the door frame mounting seat platform is arranged horizontally. A sliding hole is arranged on the door frame mounting seat platform, and the door shaft 8 is slidably matched with the sliding hole. A limiting roller assembly 13 is arranged on the door frame mounting seat platform, and the limiting roller assembly 13 is rollingly matched with the door shaft 8. Furthermore, corresponding to the same door shaft 8, a second set of door frame components 9 is arranged below the door leaf component 10, and the limiting roller components 13 arranged on the two door frame components 9 are arranged on both sides of the door shaft 8. The limiting roller components 13 arranged on both sides of the door shaft 8 limit the door shaft 8 during the lifting process, specifically, limit the door shaft 8 to the left and right to prevent the door shaft 8 from shaking and improve the stability of the door shaft 8 during lifting. The door shaft 8 is a solid metal shaft, and the door shaft 8 is a special-shaped shaft (a round shaft structure and a truncated table structure (shaft table) is arranged on the shaft to support the door leaf component 10 for lifting up and down), and the door leaf component 10 is arranged below the door frame component 9. The door leaf component 10 is fixedly arranged on the door leaf 2, and a shaft table is arranged on the door shaft 8 corresponding to the shaft section of the door leaf component 10 (the entire door shaft 8 is an integrated structure), and the door leaf component 10 is arranged on the shaft table and can move up and down with the door shaft 8 through the shaft table.

[0062] The door shaft 8, the door frame assembly 9 and the door leaf assembly 10 form a liftable door shaft unit. There are at least two liftable door shaft units. The two liftable door shaft units are vertically arranged and all the door shafts 8 are coaxially arranged and fixedly connected by the sleeve 11. The door leaf assembly 10 includes a door leaf mounting seat, on which are arranged a plurality of bearing assemblies that rotate with the door shaft 8. The door leaf mounting seat is provided with a door leaf connecting arm, which is fixedly connected to the door leaf 2. Furthermore, the present invention also provides a reinforced connection assembly 14, which includes a reinforced connection arm, at the end of which is provided a reinforced support, which is used to be fixedly connected to the door leaf 2, and the reinforced connection arm is connected to the door shaft 8 through a bearing; there are a plurality of reinforced connection assemblies 14 and they are arranged at intervals.

[0063] In a specific embodiment of the present invention, the door shaft 8 is a two-stage structure, and two door shafts 8 are provided, and they are coaxially arranged from top to bottom, and the upper shaft and the lower shaft are installed through a sleeve 11 (the sleeve 11 has a hole bored inside, which is used to install the door shaft 8, and can also be fixedly installed on the lower door shaft and support the upper door shaft at the same time). From top to bottom, the door frame assembly 9, the reinforced connection assembly 14, the load-bearing arm (one of the components of the door leaf assembly 10), the slider 24 (gasket), the bearing (the bearing is set on the pillow block, the slider 24 is set on the bearing, and the load-bearing arm is set on the slider 24), the reinforced connection assembly 14 (located below the pillow block) and the second door frame assembly 9 are installed on the same door shaft 8. Among them, the door frame assembly 9, the reinforced connection assembly 14, and the load-bearing arm are all connected to the door shaft 8 by bearings. A door shaft frame is set at the bottom end of the lower door shaft 8 for installing the hydraulic device 12. Specifically, the hydraulic device 12 is a hydraulic jack, and the jack is connected to the door shaft frame through a rotating docking structure (such as a bearing that can withstand greater pressure). In this way, after the jack is fixedly installed, it can also provide sufficient lifting force to the door shaft 8 when the door shaft 8 rotates.

[0064] The urban underground clean ventilation duct threshold-free double-leaf flood-proof protective closed door provided by the present invention has various systems (including door frame 1, door leaf 2, locking system, explosion-proof valve system, small flood-proof door system, etc.) that adopt modular design. Each part can be produced and assembled at the manufacturer and then sent to the site for assembly, which can greatly simplify the on-site assembly operation and improve the on-site construction progress.

[0065] Through the above-mentioned design, the present invention solves the five key technical problems that need to be solved in the protection and disaster prevention equipment in the underground space and civil air defense projects. The present invention has the following technical features: (1) Functional integration: the equipment integrates wartime ventilation coarse filtration, high wave absorption rate, protection, sealing, and flood prevention functions; (2) Large size and threshold-free: no ground trench, which simplifies the opening and closing process, reduces the maintenance workload in peacetime and improves safety; (3) Opening in the uphill direction: It has better adaptability to civil engineering conditions, more reliable protection and flood prevention functions, and more reasonable structure; (4) Faster conversion between peacetime and wartime: no ground trench, no threshold, linked lifting and sealing beam and other designs ensure faster conversion between peacetime and wartime; (5) Anti-corrosion in coastal environments: the coating system adopts epoxy anti-corrosion coating or high-performance anti-corrosion coating to solve the anti-corrosion in coastal high-salt and high-humidity environments.

[0066] As can be seen from the above, the present invention provides a threshold-free double-leaf flood-proof protective closed door for a clean ventilation duct in an urban underground space, specifically comprising: a door frame 1 and a door leaf 2, the door leaf 2 is arranged on the door frame 1 through a liftable door shaft system to meet the installation requirements of the ramp entrance and exit, and a vent 3 and a small door 4 are arranged on the door leaf 2; a locking system, the locking system is used to realize the locking of the door leaf 2 on the door frame 1; an explosion-proof valve system, the explosion-proof valve system includes an explosion-proof valve assembly 5 for installation on the vent 3 and a small electric protective closed door 6 arranged on the door leaf 2 for closing the vent 3, the explosion-proof valve assembly 5 is an assembled structure, the explosion-proof valve assembly 5 includes an explosion-proof valve unit, and the number of explosion-proof valve units is adjustable; a small flood-proof door system, the small flood-proof door system includes a small flood-proof door 7, the small flood-proof door 7 is hinged on the door leaf 2 and can be airtightly closed to the small door 4.

[0067] According to the requirements of urban underground traffic tunnels and civil air defense projects, the key technical problems to be solved are as follows:

[0068] (1) Structural optimization of large-sized threshold-free double-leaf flood-proof protective closed doors.

[0069] The opening size of the highway tunnel entrance is larger than that of other underground projects (the opening area is increased by more than 1 times), which leads to a sharp increase in the weight of the equipment door leaf 2 and the sealing structure, and the locking and hinge structures need to be matched. At the same time, the increase in the opening size leads to the need for corresponding design optimization of the structural strength and stiffness under the design load. The existing design solutions for non-threshold protection equipment such as movable door sills, flip sealing beams and single-leaf lifting sealing beams cannot be directly applied.

[0070] (2) The integration of ventilation, flood prevention and sealing functions of equipment.

[0071] In order to reduce the types and quantity of equipment, the first door used in the entrance of the urban underground traffic tunnel is planned to be a protective closed door with ventilation and flood prevention functions. At present, there is no mature technical solution, and it is necessary to realize functional integration in a limited layout space according to the characteristics of each functional module.

[0072] (3) The door body opens in an uphill direction when there is no threshold design.

[0073] The existing solution for opening the door body in the uphill direction adopts a drop-type door solution or a movable threshold door solution, which has the problems of complex operation, long conversion time, and inconvenient maintenance and management under large opening sizes.

[0074] (4) The equipment operation is complicated and the operation time is too long.

[0075] The existing movable door without threshold along the uphill direction has a heavy movable threshold, and the bolts need to be tightened on site during conversion. The drop-down door has a trench, so the heavy trench cover needs to be operated first. At the same time, the depth of the trench needs to be overcome during the lifting and lowering of the door body. The above solutions are complicated to operate and the conversion time is too long, which cannot meet the requirements of rapid and timely closing of the flood prevention function.

[0076] (5) Equipment maintenance issues.

[0077] The later maintenance of the equipment mainly involves the maintenance and care of the equipment's anti-corrosion coating and the rubber components of key functional units.

[0078] The present invention aims at urban underground traffic tunnels taking into account the defense requirements of civil air defense projects, and carries out research and design of new protective equipment according to the size characteristics, slope requirements and functional requirements of the openings of existing buildings. The urban underground clean ventilation duct threshold-free double-leaf flood-proof protective closed door provided by the present invention has been verified through trial production and has met the expected functional requirements and performance indicators. The invention solves the problem of whether urban underground traffic tunnels have disaster prevention and protection equipment in civil air defense projects. Compared with the existing highway tunnel flood-proof door solutions at home and abroad: the present invention is simple to operate, has a short conversion time, and can better meet the requirements of timely and rapid closure under sudden water conditions. The relevant technical solutions can be further extended to the field of highway tunnel flood-proof doors. The present invention meets the requirements of the entrance defense of urban underground traffic tunnels taking into account civil air defense projects and the normal use requirements of tunnels. A new type of equipment can be used to achieve ventilation, flood prevention and protective sealing functions, reducing the types and number of defense equipment.

[0079] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A double-leaf flood-proof and airtight door without a threshold for a clean ventilation duct in an urban underground space, characterized in that: include: A door frame and a door leaf, wherein the door leaf is arranged on the door frame through a liftable door shaft system to meet the installation requirements of the ramp entrance and exit, and a vent and a small door are arranged on the door leaf; A locking system, the locking system being used to achieve locking of the door leaf on the door frame; An explosion-proof valve system, the explosion-proof valve system comprising an explosion-proof valve assembly for installation on the vent and a small electric protective airtight door arranged on the door leaf for closing the vent, the explosion-proof valve assembly being an assembled structure, the explosion-proof valve assembly comprising explosion-proof valve units, and the number of explosion-proof valve units being adjustable; A small flood-proof door system, the small flood-proof door system comprising a small flood-proof door, the small flood-proof door being hinged on the door leaf and being airtightly closed onto the small door opening; The liftable door shaft system comprises a door shaft, and the door shaft is arranged vertically; A door frame assembly is arranged corresponding to the top end of the door shaft, the door frame assembly is fixedly arranged on the door frame, and the door shaft can move up and down relative to the door frame assembly; A door leaf assembly is arranged below the door frame assembly, the door leaf assembly is fixedly arranged on the door leaf, a shaft block is arranged on the door shaft corresponding to the shaft section of the door leaf assembly, and the door leaf assembly is arranged on the shaft block and can move up and down with the door shaft through the shaft block; The door shaft, the door frame assembly and the door leaf assembly form a liftable door shaft unit, and at least two liftable door shaft units are provided, the two liftable door shaft units are vertically arranged and all the door shafts are coaxially arranged and fixedly connected by sleeves; Also included is a hydraulic device for lifting the door shaft; The door frame assembly includes a door frame mounting seat, a door frame mounting seat platform is arranged on the door frame mounting seat, the door frame mounting seat is fixedly arranged on the door frame, the door frame mounting seat platform is arranged horizontally, a sliding hole is arranged on the door frame mounting seat platform, the door shaft is slidably matched with the sliding hole, a limited roller assembly is arranged on the door frame mounting seat platform, and the limited roller assembly is rolling matched with the door shaft; The door leaf assembly includes a door leaf mounting seat, on which are disposed a plurality of bearing assemblies rotatably matched with the door shaft, and on which are disposed a door leaf connecting arm, which is fixedly connected to the door leaf.

2. The threshold-free double-leaf flood-proof protective closed door for clean ventilation duct in urban underground space according to claim 1 is characterized in that: It also includes a reinforcement connection assembly, which includes a reinforcement connection arm, a reinforcement support is provided at the end of the reinforcement connection arm, the reinforcement support is used to be fixedly connected to the door leaf, and the reinforcement connection arm is connected to the door shaft through a bearing; The reinforcing connection components are provided in multiple groups and are arranged at intervals; Corresponding to the same door shaft, a second set of door frame components is arranged below the door leaf component, and the limiting roller components arranged on the two door frame components are arranged on both sides of the door shaft.

3. The threshold-free double-leaf flood-proof protective closed door for clean ventilation duct in urban underground space according to claim 1 is characterized in that: The small flood-proof doors are provided with two and are respectively hinged on both sides of the door leaf, and each of the two small flood-proof doors is provided with a small flood-proof door locking system.

4. The threshold-free double-leaf flood-proof protective closed door for clean ventilation duct in urban underground space according to claim 1 is characterized in that: The locking system includes a hand wheel, a connecting rod subsystem connected to the hand wheel and used to achieve power output, a bottom latch assembly and a top latch assembly connected to the connecting rod subsystem in power; The door leaf is locked with the door frame at the top and the bottom through the locking system.

5. The threshold-free double-leaf flood-proof protective closed door for clean ventilation duct in urban underground space according to claim 1 is characterized in that: The explosion-proof wave valve unit includes an air supply channel capable of bidirectional air supply, an activity space is provided in the air supply channel, and a wave-breaking pipe is provided in the activity space. When the air flow velocity in the air supply channel is not greater than a threshold value, the wave-breaking pipe is located in the activity space to realize the conduction of the air supply channel. When the air flow velocity in the air supply channel is greater than a threshold value, the wave-breaking pipe can be moved in the activity space under the action of the air flow to close the air supply channel.

6. The threshold-free double-leaf flood-proof protective closed door for clean ventilation duct in urban underground space according to claim 5 is characterized in that: The explosion-proof valve unit includes a windward surface structure and a leeward surface structure. Two windward surface structures are provided. The two windward surface structures are spaced apart in the vertical direction to form a front air supply channel. Two leeward surface structures are provided. The two leeward surface structures are spaced apart in the vertical direction to form a rear air supply channel. The windward surface structure and the leeward surface structure are spaced apart in the air supply direction to form the activity space. Mounting clamps are provided on both sides of the windward surface structure and the leeward surface structure for fixedly mounting the windward surface structure and the leeward surface structure. Both ends of the wave-breaking pipe are square tube structures and slidingly cooperate with the mounting clamps. The middle section of the wave-breaking pipe is a round tube structure, which can be abutted against the two windward surface structures or against the two leeward surface structures to close the front air supply channel or the rear air supply channel.

7. The threshold-free double-leaf flood-proof protective closed door for clean ventilation duct in urban underground space according to claim 1 is characterized in that: A small electric protective closed door system is also arranged on the door leaf, and the small electric protective closed door system includes a small electric protective closed door, and the small electric protective closed door is hinged on the door leaf. The small electric protective closed door system also includes a flipping and locking linkage system, which is used for the linkage of the flipping opening and locking actions of the small electric protective closed door.

8. The threshold-free double-leaf flood-proof protective closed door for clean ventilation duct in urban underground space according to claim 1 is characterized in that: There are two door leaves, the two door leaves are a double-opening installation structure, the door leaves are an uphill opening structure, a set of explosion-proof valve systems is arranged on each of the two door leaves, and a set of small flood-proof door systems is arranged on one of the door leaves.

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