CN117703234A - Threshold-free flood-proof protective airtight door for urban underground space entrance - Google Patents

Abstract

The invention relates to the technical field of underground space flood prevention, in particular to a threshold-free flood prevention protective airtight door for an urban underground space entrance, which is arranged on a door frame wall and comprises a door body mechanism, a locking mechanism, a hinge mechanism and a ground sealing mechanism, wherein the locking mechanism, the hinge mechanism and the ground sealing mechanism are arranged on the door body mechanism; in the invention, the locking mechanism, the hinge mechanism and the ground sealing mechanism are mutually matched with the door body mechanism, so that the sealing effect of the entrance and the exit of the urban underground space is realized, the flood control problem under the condition that the main flood control measures of the subway fail is fundamentally solved, and the complete blocking equipment with good watertight performance for the mouth is adopted; meanwhile, the convenience of door leaf switch movement is enhanced through the hinge mechanism, timely and rapid switch under emergency is realized, and the problems of flood control and flooding prevention of subway entrances and exits in the prior art that the topography is particularly low or reliable external flood control measures are lacking are solved.

Description

A threshold-less flood-proof and sealed door for urban underground space entrances and exits

Technical field

The invention relates to the technical field of underground space flooding prevention, and specifically refers to a threshold-less flood-preventing and protective closed door for urban underground space entrances and exits.

Background technique

Developing urban underground space can save valuable land resources, protect the natural ecological environment, improve urban intensification, and has outstanding advantages in protecting against war and earthquake disasters, and is conducive to the sustainable development of cities.

Urban underground space is an important part of modern urban civilization. When a flood occurs in a city, it will first affect the urban underground space. When the flood arrives, when the ground buildings are still safe, the underground space will be filled with water, which will even affect the entire connected underground space, and even reach the deepest layer of the multi-layer underground space, causing serious losses.

Our country has built a large number of high-quality and efficient subway civil air defense projects, which has put forward higher requirements for the safety of subway entrance and exit civil air defense doors that take into account flood control.

Normally, when a city encounters extreme rainfall and serious water accumulation on the road surface, there are generally two situations that will cause the subway to be flooded. One is that the water accumulation on the ground exceeds the designed flood control height of the entrance and exit of the subway station or the wind well mouth. The water flows back into the subway station from the station entrance or wind well mouth; the other is that the accumulated water directly enters the subway section tunnel from the subway entrance and exit track area to the station, platform, and station hall. Due to the interoperability of the subway, no matter which of the above situations occurs, a large amount of rainwater (flood) in a certain place will affect adjacent stations and even all subway stations and interval tunnels, causing losses to people and property.

Urban flood control is a category involving regions or watersheds, and underground space is a point or line within a region, so the relationship between the two is a point, line, and surface. Urban flood disaster system is a typical natural disaster system in cities, and urban underground space is often extremely vulnerable when faced with heavy rains, waterlogging, and upstream flood disasters.

The subway entrance and exit civil defense doors have protective properties against explosion shock waves and anti-toxic gas sealing properties. They are highly similar to the water pressure resistance and anti-leakage functions required for flood control. Therefore, the subway entrance and exit civil defense doors have a certain degree of waterproofing and flooding capabilities. , it can be used as a temporary water blocking facility when the amount of water is not large, but it cannot be used as the main flood control and flood prevention facility to withstand large amounts of water. The main reasons are as follows: 1. It does not have water level sensing and remote electronic control opening and closing functions. , unable to meet the requirements for short-term rapid closure; 2. There is a big difference between the design working conditions and the flood-proof working conditions. The water-tight performance under large amounts of water and for a long time cannot meet the flood-proof requirements; 3. The transition time limit between peacetime and peacetime and flood-proofing conditions The timeliness of emergency response is different. Existing equipment requires on-site operations to open and close the equipment. Its timeliness is low and there is a risk of not being able to operate under partial flooding conditions. Civil air defense and flood prevention in the subway only have similar partial functional requirements, but are not the same. Without special research and design, it is not feasible to directly take into account the civil air defense function and flood prevention.

The most important thing for subway flood control is to prevent water from flowing into the underground space. There are many connections between the subway underground space and the ground space, among which the entrances and exits of subway stations are the most important. The existing civil defense doors at the entrances and exits of underground spaces such as subways are installed in the civil defense protection sections of station entrances and exits, without taking into account the flood prevention function.

Flood prevention design is also a professional sub-item in subway design. Generally, different flood prevention and flood prevention measures will be set up according to different working conditions, such as setting up water intercepting ditches and waterproof baffles at station entrances and wind wells, and installing waterproof baffles in section tunnels. Separate flood-proof doors or civil air defense equipment with flood-proof functions should be installed inside.

The main existing flood control measures for the subway are to control risks by raising the flood control elevation of entrance building structures connecting stations, sections and the ground. The minimum water level for fortification is the comprehensive recommended water level that returns once in 100 years. The elevation of the building structure is designed by adding a certain safety value (generally 0.3 to 0.45m) to the design flood control elevation. If the water accumulation in the mouth exceeds the structural elevation of the mouth, water begins to enter the building. The main problems under this design model are as follows: 1. The fortification water level is based on historical statistical data. With the impact of climate change in recent years, occasional extreme rainstorms can easily cause the risk of water accumulation in the mouth far exceeding the design target. 2. Due to the requirement for people to pass through, the elevation of the building structure cannot be increased without limit. 3. The terrain of some stations is low and cannot be designed according to the fortification elevation.

In recent years, the main existing flood control measures in the subway have frequently failed. When dealing with flooding, supplementary flood control measures need to be taken. Flood prevention measures are often implemented by arranging flood control sandbags and water retaining boards. This method requires the deployment of a large number of personnel, has the problems of difficult management and low operating efficiency.

In order to fundamentally solve the flood control problem when the main flood control measures of the subway fail, as well as the flood control and flood control problem of the subway entrances and exits in low-lying areas or lacking reliable external flood control measures, it is necessary to use complete mouth sealing equipment with good watertight performance. At the same time, considering the difficulty and efficiency of human operation in flooded conditions, fully automated opening and closing equipment should be used to minimize the impact of the equipment on operations and requirements for personnel, and to achieve timely and rapid shutdown in emergencies.

Contents of the invention

The purpose of the present invention is to: in order to solve the problems existing in the prior art, the present invention provides a threshold-less flood-proof and sealed door for the entrance and exit of urban underground space.

In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions:

A threshold-less flood-proof and sealed door for urban underground space entrances and exits is arranged on a door frame wall. The threshold-less flood-proof and sealed door for urban underground space entrances and exits includes a door body mechanism, a locking mechanism, a hinge mechanism and a ground sealing mechanism. The locking mechanism, the hinge mechanism and the ground sealing mechanism are provided on the door mechanism;

The door mechanism is used to open and close the underground space entrance and exit, and the door mechanism includes a left door leaf and a right door leaf; the hinge mechanisms are respectively provided at the connection between the left door leaf and the door frame and At the connection between the right door leaf and the door frame, the hinge mechanism is used to open and close the left door leaf and the right door leaf;

The ground sealing mechanism is provided on the left door leaf and/or the right door leaf and is used to seal the door body mechanism. The locking mechanism is used to lock or unlock the door body mechanism.

As an improvement of the technical solution of the threshold-less flood-proof and sealed door for urban underground space entrances and exits of the present invention, the door frame wall includes a door frame, and the door frame includes an upper door frame, a left door frame and a right door frame, and the upper door frame includes There are lifting rings provided.

As an improvement of the technical solution of the threshold-less flood-proof and sealed door for urban underground space entrances and exits of the present invention, the locking mechanism includes a first handwheel, a worm gear reducer, a commutator, an upper locking seat, a lower locking seat and a locking mechanism. head, the locking head is arranged in the upper locking seat and the lower locking seat;

The upper locking seat and the lower locking seat are respectively arranged on the upper and lower parts of the door leaf. The upper locking seat and the lower locking seat clamp the door leaf, and the upper locking seat and the lower locking seat clamp the door leaf. The seats are connected through a first connecting rod. The commutator is provided on the first connecting rod. The commutator is connected to the worm gear reducer through a second connecting rod, and the worm gear reduces the speed. The device is also connected to the first handwheel.

As an improvement of the technical solution of the threshold-less flood-proof and sealed door for urban underground space entrances and exits of the present invention, the first connecting rod and the second connecting rod are respectively screw rods.

As an improvement of the technical solution of the invention's threshold-less flood-proof and sealed door for urban underground space entrances and exits, the hinge mechanism includes a hinge seat, a door leaf hinge seat, a load-bearing arm, a vertical shaft, a hinge plate, balls, and bearings;

The hinge seat is arranged at the door frame, the door hinge seat is arranged on one side of the hinge seat, and the door hinge seat is connected to the door leaf;

The door leaf moves forward and backward on the ball through the load-bearing arm; the upper and lower ends of the vertical shaft are respectively provided with bearings, and the upper and lower ends of the vertical shaft are respectively connected to the hinge seat, and the vertical shaft is on the bearing. rotate under support;

The hinge plate is connected to the door leaf and the vertical shaft respectively. Through holes are provided at both ends of the hinge plate. A first shaft body is inserted through the through hole. When the door leaf is translated, the two The first shaft body forms two hinge axes.

As an improvement of the technical solution of the threshold-less flood-proof and sealed door for urban underground space entrances and exits of the present invention, the ground sealing mechanism includes a sealing beam and a lifting mechanism that controls the lifting and lowering of the sealing beam. The lifting mechanism includes a second Handwheel, the second handwheel is connected to the sealing beam through a screw rod.

As an improvement of the technical solution of the threshold-less flood-proof and sealed door for urban underground space entrances and exits of the present invention, the ground sealing mechanism also includes a plurality of sealing strips, and a first sealing strip is provided on the top of the sealing beam. The first sealing strip is arranged between the door leaf and the sealing beam;

Second sealing strips are respectively provided at both ends of the sealing beam. The second sealing strip is disposed between the sealing beam and the door frame. The first sealing strip and the second sealing strip form a sealing circuit. .

As an improvement of the technical solution of the threshold-less flood-proof and sealed door for urban underground space entrances and exits of the present invention, both ends of the sealing beam are inclined interfaces, and rubber plates and rubber plate connecting plates are installed at the inclined interfaces.

As an improvement of the technical solution of the threshold-less flood-proof and sealed door for urban underground space entrances and exits of the present invention, the sealing beam includes two sections: a first sealing beam and a second sealing beam. The first sealing beam and the third sealing beam The two sealing beams are connected through the rubber plate.

As an improvement of the technical solution of the threshold-less flood-proof and sealed door for urban underground space entrances and exits of the present invention, the door body assembly includes an upper angle steel, a side angle steel and a lower door frame assembly, and the upper angle steel is respectively arranged on the door frame. On the left and right sides, the two upper angle steels and the side angle steels are provided with sealing strips, and the sealing strips are arranged on the door frame through screws and strip pressing plates.

Beneficial effects of the present invention:

In the present invention, the locking mechanism, the hinge mechanism, the ground sealing mechanism and the door body mechanism cooperate with each other to achieve the sealing effect of the entrance and exit of the urban underground space, and fundamentally solve the flood prevention problem when the main flood prevention measures of the subway fail. The mouth is fully sealed with good watertight performance; at the same time, the hinge mechanism enhances the convenience of door leaf opening and closing, enabling timely and rapid opening and closing in emergencies.

Description of the drawings

Figure 1 is a schematic structural diagram of the present invention;

Figure 2 is a schematic structural diagram of the locking mechanism in the present invention;

Figure 3 is a schematic cross-sectional structural diagram of the door frame of the present invention;

Figure 4 is a schematic structural diagram of the anchor in the present invention;

Figure 5 is a schematic structural diagram of the ground sealing mechanism in the present invention;

Figure 6 is a schematic structural diagram of the ground sealing mechanism in the present invention;

Figure 7 is a schematic structural diagram of the positioning jack in the present invention;

Figure 8 is a schematic diagram of the anchoring structure of the anchor in the present invention.

Explanation of reference signs: 1 - door frame; 2 - door leaf; 3 - hinge mechanism; 4 - lifting mechanism; 5 - ground sealing mechanism; 6 - positioning jack; 7 - locking mechanism; 8 - door frame wall; 9 - locking head; 10-upper locking seat; 11-lower locking seat; 12-commutator; 13-worm gear reducer; 14-upper hinge seat; 15-lower hinge seat; 16-anchor; 17-door hinge seat; 18 - Hinge plate; 19-vertical shaft; 20-load-bearing arm; 21-ball; 22-bearing; 23-sealing beam lifting mechanism; 24-sealing beam; 25-sealing strip; 26-suspended ring; 27-first connecting rod; 28 -Second connecting rod.

Detailed ways

In order to make the purpose, technical solutions and beneficial effects of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments These are only some embodiments of the present invention, rather than all embodiments.

As shown in Figures 1 to 8, a threshold-less flood-proof and sealed door for urban underground space entrances and exits is set on the door frame wall 8. The threshold-less flood-proof and sealed door for urban underground space entrances and exits includes a door body mechanism and a locking mechanism 7 , hinge mechanism 3 and ground sealing mechanism 5, locking mechanism 7, hinge mechanism 3 and ground sealing mechanism 5 are arranged on the door body mechanism;

The door mechanism is used to open and close the entrance and exit of the underground space, and the door mechanism includes a left door leaf 2 and a right door leaf 2; the hinge mechanism 3 is respectively provided at the connection between the left door leaf 2 and the door frame 1 and at the connection between the right door leaf 2 and the door frame 1. At the connection, the hinge mechanism 3 is used to open and close the left door leaf 2 and the right door leaf 2;

The ground sealing mechanism 5 is provided on the left door leaf 2 and/or the right door leaf 2 for sealing the door body mechanism, and the locking mechanism 7 is used for locking or unlocking the door body mechanism.

In the present invention, the door body mechanism realizes the effect of opening or closing the underground space entrance and exit, and the hinge mechanism 3 realizes the opening or closing effect of the door leaf 2 in the door body mechanism. At the same time, the door leaf 2 is locked by the locking mechanism 7 , and then cooperate with the ground sealing mechanism 5 to achieve the sealing effect between the door leaves 2 and between the door leaves 2 and the door frame wall 8. Through the cooperation of the locking mechanism 7, the hinge mechanism 3, the ground sealing mechanism 5 and the door body mechanism, the sealing effect is achieved. It improves the sealing effect of the entrance and exit of the urban underground space, fundamentally solves the flood control problem when the main flood control measures of the subway fail, and uses a complete mouth sealing device with good watertight performance; at the same time, the hinge mechanism 3 enhances the opening and closing movement of the door leaf 2 The convenience enables timely and quick switching in emergencies.

Preferably, a positioning jack 6 is provided at the lower part of the door leaf 2, and the door leaf 2 can be positioned through the positioning jack 6.

As an embodiment of the present invention, the door frame wall 8 includes a door frame 1. The door frame 1 includes an upper door frame 1, a left door frame 1 and a right door frame 1. The upper door frame 1 includes a hanging ring 26. Through the door frame 1 and the door leaf 2 The mutual cooperation ensures the opening or closing effect of the door leaf 2 relative to the door frame wall 8, and achieves the effect of initially blocking the underground entrance and exit. Among them, the lifting ring 26 mainly plays a lifting role during installation and maintenance.

As an embodiment of the present invention, the locking mechanism 7 includes a first handwheel, a worm gear reducer 13, a commutator 12, an upper locking seat 10, a lower locking seat 11 and a locking head 9. The locking head 9 is arranged on the upper locking seat. in seat 10 and lower locking seat 11;

The upper locking seat 10 and the lower locking seat 11 are respectively arranged on the upper and lower parts of the door leaf 2. The upper locking seat 10 and the lower locking seat 11 clamp the door leaf 2, and the upper locking seat 10 and the lower locking seat 11 are connected by a first connecting rod. 27 is connected, the first connecting rod 27 is provided with a commutator 12, the commutator 12 is connected to the worm gear reducer 13 through the second connecting rod 28, and the worm gear reducer 13 is also connected to the first handwheel.

When in use, through the rotation of the first handwheel, the distance between the upper locking seat 10 and the lower locking seat 11 is reduced, and the effect of tightening the locking head 9 on the door leaf 2 is achieved. Moreover, based on the worm gear reducer 13 Features: The worm gear reducer 13 increases the torque, and uses the gear speed converter to reduce the number of revolutions of the motor to the required number of revolutions and obtain a larger torque.

Specifically, during use, after the door leaf 2 is closed, the door leaf 2 is locked by the locking mechanism 7 to prevent the door leaf 2 from being flushed open under the action of water flow. Further, the locking mechanism 7 includes a locking head 9, which is arranged in the abdominal cavity of the door leaf 2. The rotation of the first handwheel drives the worm gear reducer 13 to drive the commutator 12 to move along the length direction of the transverse link. The rod drives the screw rod to rotate through the commutator 12, and then drives the locking head 9 to move up and down to complete the function of locking the door leaf 2. The locking mechanism 7 achieves a linkage locking effect, that is, one handwheel drives multiple locking heads 9 to move synchronously; at the same time, space can be made for the ground sealing mechanism 5 so that the ground sealing mechanism 5 can be installed on the inner surface of the door leaf 2 .

Preferably, the first connecting rod 27 and the second connecting rod 28 are screw rods respectively, which can facilitate the rotation of the first connecting rod 27 and the second connecting rod 28 and also facilitate the adjustment of the distance between the upper locking seat 10 and the lower locking seat 11. distance.

As an embodiment of the present invention, the hinge mechanism 3 includes a hinge seat, a door leaf hinge seat 17, a load-bearing arm 20, a vertical shaft 19, a hinge plate 18, balls 21, and a bearing 22; the hinge seat is arranged at the door frame 1, The door leaf hinge seat 17 is arranged on one side of the hinge seat, and the door leaf hinge seat 17 is connected to the door leaf 2; the door leaf 2 moves forward and backward on the ball 21 through the load-bearing arm 20; the upper and lower ends of the vertical shaft 19 are respectively provided with bearings 22, and the vertical shaft The upper and lower ends of 19 are respectively connected to the hinge seats, and the vertical shaft 19 rotates under the support of the bearing 22; the hinge plate 18 is connected to the door leaf 2 and the vertical shaft 19 respectively, and there are through holes at both ends of the hinge plate 18, and there are through holes in the through holes. There is a first axis body. When the door leaf 2 is translated, the two first axis bodies form two hinge axes.

In detail, when opening and closing the door leaf 2, the vertical shaft 19 is supported by the upper and lower bearings 22; when the door leaf 2 is opened, the door leaf 2 translates, and the door leaf 2 moves forward and backward on the ball 21 through the load-bearing arm 20, thereby reducing the locking time. resistance. At the same time, the hinge plate 18 is connected to the door leaf 2 and the vertical shaft 19 respectively. Through holes are provided at both ends of the hinge plate 18, and a first shaft body is penetrated through the through hole. When the door leaf 2 is translated, the two first shaft bodies form two The hinge axis opens the door leaf 2 to 180° relative to the closed position. When set at the communication port of the protection unit, the door leaf 2 of the non-threshold flood protection airtight door can be close to the partition wall of the protection unit, providing convenience for underground engineering. Develop applications to leave more space for use.

As an embodiment of the present invention, the ground sealing mechanism 5 includes a sealing beam 24 and a lifting mechanism 4 that controls the lifting and lowering of the sealing beam 24. The lifting mechanism 4 includes a second handwheel, and the second handwheel communicates with the sealing beam 24 through a screw rod. connected. The lifting mechanism 4 controls the lifting and lowering of the sealing beam 24 .

Further, the ground sealing mechanism 5 also includes a plurality of sealing strips 25, a first sealing strip 25 is arranged on the upper surface of the sealing beam 24, and the first sealing strip 25 is arranged between the door leaf 2 and the sealing beam 24;

Second sealing strips 25 are respectively provided at both ends of the sealing beam 24. The second sealing strips 25 are disposed between the sealing beam 24 and the door frame 1. The first sealing strip 25 and the second sealing strip 25 form a sealing circuit.

Since the sealing beam 24 is relatively long, the compression amount of the sealing strip 25 is relatively large, so the rebound force of the sealing strip 25 is also relatively large, and the reversing transmission is a speed-increasing and force-reducing mechanism. In order to achieve ground sealing more easily, the sealing The rebound force of strip 25 is transmitted to the screw. Because the screw has a self-locking function, the ground sealing driving mechanism can complete the action under the action of relatively small manual force and has a self-locking function. When there is no opening force on the handle, the sealing The beam 24 will not bounce up on its own, and it will feel very labor-saving during operation.

In detail, a plurality of sealing strips 25 form a sealing circuit to achieve sealing between the left, right and upper parts of the door leaf 2 and the door frame 1 . As an example of this embodiment, the upper sealing strip 25 is an Ω-shaped sealing strip to complete the sealing between the door leaf 2 and the sealing beam 24. The two ends of the sealing beam 24 adopt oblique joints and the door frame 1 The sealing strips 25 are connected to form a complete sealing circuit.

Furthermore, both ends of the sealing beam 24 are inclined joints, and a rubber plate and a rubber plate connecting plate are installed at the inclined joints. The sealing beam 24 and the second sealing strip 25 are connected through the rubber plate. Rubber plate connecting plates and rubber plates are installed on the inclined surfaces at both ends of the two sections of sealing beams 24, and rubber strips are used to connect the two sealing strips 25 on each section of the sealing beam 24. Through the processing of these technical measures, a complete sealing circuit is formed between the door leaf 2 and the door frame 1. There is no steel-to-steel contact on this sealing circuit, thus ensuring the reliability of the sealing. Among them, in order to increase the amount of compression of the ground against the rubber strip, increase the contact area between the ground and the rubber strip, and achieve reliable sealing with the ground.

As an embodiment of the ground sealing mechanism 5 of the present invention, the ground sealing mechanism 5 includes a sealing beam 24 and a lifting mechanism 4 that controls the lifting and lowering of the sealing beam 24. The lifting mechanism 4 includes a second handwheel, and the second handwheel passes through a wire. The rod is connected to the sealing beam 24. Preferably, the ground sealing mechanism 5 also includes a plurality of sealing strips 25. A first sealing strip 25 is disposed on the sealing beam 24. The first sealing strip 25 is disposed between the door leaf 2 and the sealing beam 24; both sides of the sealing beam 24 A second sealing strip 25 is provided at each end. The second sealing strip 25 is disposed between the sealing beam 24 and the door frame 1. The first sealing strip 25 and the second sealing strip 25 form a sealing circuit.

As an embodiment of the ground sealing mechanism 5 of the present invention, the ground sealing mechanism 5 also includes a plurality of anchors 16. Under the action of the plurality of anchors 16, the connection effect between the ground sealing mechanism 5 and the door mechanism is ensured. , strengthens the connection effect between the ground sealing mechanism 5 and the door body mechanism, and initially ensures the sealing effect of the ground sealing mechanism 5 and the door body mechanism.

As an embodiment of the ground sealing mechanism 5 of the present invention, both ends of the sealing beam 24 are inclined interfaces, and rubber plates and rubber plate connecting plates are installed at the inclined interfaces.

As an embodiment of the ground sealing mechanism 5 of the present invention, the sealing beam 24 includes a first sealing beam 24 and a second sealing beam 24. The first sealing beam 24 and the second sealing beam 24 are connected by a rubber plate. connect.

As an embodiment of the ground sealing mechanism 5 of the present invention, the door body assembly includes an upper angle steel, a side angle steel and a lower door frame 1 assembly. The upper angle steel is respectively provided on the left and right sides of the door frame 1, and the two upper angle steel and side angle steel are respectively arranged on the left and right sides of the door frame 1. A sealing strip is provided, and the sealing strip is set on the door frame 1 through screws and a strip pressing plate.

Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

Claims (10)

1. The non-threshold flood-proof protective airtight door for the urban underground space entrance is arranged on a door frame wall and is characterized by comprising a door body mechanism, a locking mechanism, a hinge mechanism and a ground sealing mechanism, wherein the locking mechanism, the hinge mechanism and the ground sealing mechanism are arranged on the door body mechanism;

the door body mechanism is used for opening and closing the underground space entrance and the door body mechanism comprises a left door leaf and a right door leaf; the hinge mechanism is respectively arranged at the joint of the left door leaf and the door frame and the joint of the right door leaf and the door frame, and is used for opening and closing the left door leaf and the right door leaf;

the ground sealing mechanism is arranged on the left door leaf and/or the right door leaf and used for sealing the door body mechanism, and the locking mechanism is used for locking or unlocking the door body mechanism.

2. The threshold-free flood protection airtight door for the urban underground space doorway according to claim 1, wherein the door frame wall comprises a door frame, the door frame comprises an upper door frame, a left door frame and a right door frame, and the upper door frame is provided with a hanging ring.

3. The threshold-free flood protection airtight door for the urban underground space doorway according to claim 1, wherein the locking mechanism comprises a first hand wheel, a worm gear reducer, a reverser, an upper locking seat, a lower locking seat and a locking head, wherein the locking head is arranged in the upper locking seat and the lower locking seat;

the upper locking seat and the lower locking seat are respectively arranged on the upper part and the lower part of the door leaf, the upper locking seat and the lower locking seat clamp the door leaf, the upper locking seat and the lower locking seat are connected through a first connecting rod, the first connecting rod is provided with a reverser, the reverser is connected with the worm gear reducer through a second connecting rod, and the worm gear reducer is also connected with the first hand wheel.

4. The threshold-free flood protection airtight door for an urban underground space entrance according to claim 3, wherein the first connecting rod and the second connecting rod are screw rods, respectively.

5. The threshold-free flood protection airtight door for the urban underground space doorway according to claim 1, wherein the hinge mechanism comprises a hinge seat, a door leaf hinge seat, a bearing arm, a vertical shaft, a hinge plate, a ball and a bearing;

the hinge seat is arranged at the door frame, the door leaf hinge seat is arranged at one side of the hinge seat, and the door leaf hinge seat is connected with the door leaf;

the door leaf moves back and forth on the ball through the bearing arm; the upper end and the lower end of the vertical shaft are respectively provided with a bearing, the upper end and the lower end of the vertical shaft are respectively connected with the hinge seat, and the vertical shaft rotates under the support of the bearings;

the hinge plate is respectively connected with the door leaf and the vertical shaft, through holes are formed in two ends of the hinge plate, first shaft bodies penetrate through the through holes, and when the door leaf translates, two hinge shafts are formed by the two first shaft bodies.

6. The threshold-free flood protection airtight door for the urban underground space entrance according to claim 1, wherein the ground sealing mechanism comprises a sealing beam and a lifting mechanism for controlling the lifting of the sealing beam, the lifting mechanism comprises a second hand wheel, and the second hand wheel is connected with the sealing beam through a screw rod.

7. The threshold-free flood protection airtight door for an urban underground space entrance according to claim 6, wherein the ground sealing mechanism further comprises a plurality of sealing strips, a first sealing strip is arranged on the sealing beam, and the first sealing strip is arranged between the door leaf and the sealing beam;

the sealing device is characterized in that second sealing strips are respectively arranged at two ends of the sealing beam, the second sealing strips are arranged between the sealing beam and the door frame, and the first sealing strips and the second sealing strips form a sealing loop.

8. The threshold-free flood protection airtight door for the urban underground space entrance of claim 6, wherein both ends of the sealing beam are inclined interfaces, and a rubber plate connecting plate are installed at the inclined interfaces.

9. The threshold-free flood protection airtight door for the urban underground space doorway of claim 6, wherein the sealing beam comprises a first sealing beam and a second sealing beam, and the first sealing beam and the second sealing beam are connected through the rubber plate.

10. The threshold-free flood-proof protective airtight door for the urban underground space entrance according to claim 1, wherein the door body assembly comprises upper angle steel, side angle steel and lower door frame assemblies, the upper angle steel is respectively arranged on the left side and the right side of the door frame, sealing rubber strips are arranged on the two upper angle steel and the side angle steel, and the sealing rubber strips are arranged on the door frame through screws and rubber strip pressing plates.