Subway construction drainage system

Abstract

The invention discloses a subway construction drainage system, and relates to the field of subway construction, the subway construction drainage system comprises an air compressor drainage mechanism, the air compressor drainage mechanism comprises a drainage pipe and an air pipe communicated with the drainage pipe, and the drainage pipe is internally provided with a plugging mechanism; the plugging mechanism has a first state for closing the internal space of the drainage pipe and a second state for conducting the internal space of the drainage pipe; the plugging device further comprises a power assembly used for enabling the plugging mechanism to be switched between the first state and the second state. According to the subway construction drainage system, when the plugging mechanism is in the first state, gas is directly pumped into the dewatering well through the gas pipe and the drainage pipe, and when the plugging mechanism is in the second state, the gas moves upwards through the internal space of the drainage pipe, so that the interior of the drainage pipe is in a negative pressure state; in this way, switching of the two well washing modes is achieved by controlling the state of the plugging mechanism.

Description

Technical Field

[0001] The present invention relates to the field of subway construction, and in particular to a subway construction drainage system. Background Art

[0002] It's well known that during subway construction, to lower the underground water level, dewatering wells are dug at the construction site. These wells are used to extract water, thereby lowering the surrounding groundwater level. This ensures a dry construction area and improves the soil's bearing capacity. To improve the water flow and quality of the wells, the dewatering wells need to be cleaned.

[0003] For example, the Chinese patent document with the authorization announcement number CN207111014U, the announcement date 2018-03-16, and the name "A Well Washing Equipment" includes an air compressor, a high-pressure air pipe, a slurry discharge pipe, a water pump, and a high-pressure water injection pipe. The air compressor is set on the ground, and the high-pressure air pipe, the slurry discharge pipe, and the high-pressure water injection pipe are vertically arranged in the dewatering well; one end of the high-pressure air pipe is connected to the air compressor, and the other end is connected to the bottom side wall of the slurry discharge pipe; one end of the high-pressure water injection pipe is connected to the water pump, and the other end is fixed to the bottom side wall of the slurry discharge pipe. This utility model can make the water in the slurry discharge pipe and the water in the dewatering well always maintain a certain head pressure, so that the mud in the well is continuously discharged out of the well, thereby improving the efficiency of well washing; the high-speed water flow at the outlet of the high-pressure water injection pipe forms an air-water mixture with the high-pressure gas, which enhances the effect of impacting mud and sand.

[0004] When using an air compressor to wash a dewatering well, there are usually two methods: air pipe hard pressure and negative pressure pumping. Both have their own advantages and disadvantages and are used to adapt to different construction environments. The shortcomings of the above-mentioned existing technology are that it can only achieve a single well washing method and cannot take into account the advantages of both methods, which makes it relatively limited and has a small scope of application. Summary of the Invention

[0005] The purpose of the present invention is to provide a subway construction drainage system to solve the above-mentioned deficiencies in the prior art.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A subway construction drainage system includes an air compressor drainage mechanism, which includes a drainage pipe and an air pipe connected to the drainage pipe. A sealing mechanism is provided inside the drainage pipe; the sealing mechanism has a first state for closing the internal space of the drainage pipe and a second state for opening the internal space of the drainage pipe; and also includes a power component for switching the sealing mechanism between the first state and the second state.

[0008] In the above-mentioned subway construction drainage system, the blocking mechanism is an electric valve, and the electric valve is arranged on the drainage pipe.

[0009] In the above-mentioned subway construction drainage system, the blocking mechanism includes a baffle, a shell is provided on the drainage pipe, and the baffle is slidably provided inside the shell.

[0010] In the above-mentioned subway construction drainage system, the shell is provided with an inclined surface.

[0011] In the above-mentioned subway construction drainage system, the power assembly includes a transmission plate, which is elastically arranged inside the shell, fixedly connected to the baffle, and located on the movement path of the gas inside the air pipe.

[0012] The above-mentioned subway construction drainage system increases the air pressure inside the air pipe when the drainage pipe is blocked.

[0013] In the above-mentioned subway construction drainage system, a guide portion is provided inside the air pipe.

[0014] In the above-mentioned subway construction drainage system, the baffle includes a first section and a second section that are slidably connected to each other, and a speed-up component is provided between the first section and the second section. When the first section moves, the speed-up component drives the second section to move twice as fast.

[0015] In the above-mentioned subway construction drainage system, the speed-up component includes a first tooth plate and a second tooth plate, the first tooth plate is fixed to the inside of the shell, the second tooth plate is arranged on the second section, and a gear is provided on the first section, and the gear is engaged with the first tooth plate and the second tooth plate at the same time.

[0016] In the above-mentioned subway construction drainage system, a locking assembly for fixing the position of the baffle is provided inside the shell.

[0017] In the above technical solution, the subway construction drainage system provided by the present invention is provided with a sealing mechanism inside the drainage pipe. The sealing mechanism has a first state for closing the internal space of the drainage pipe and a second state for making the internal space of the drainage pipe conductive. When the sealing mechanism is in the first state, the gas is directly pumped into the precipitation well through the air pipe and the drainage pipe, which is the air pipe hard pressure well washing. When the sealing mechanism is in the second state, the gas moves upward through the internal space of the drainage pipe, so that the inside of the drainage pipe is in a negative pressure state, so that the water inside the precipitation well is extracted through the drainage pipe, which is the negative pressure suction well washing. In this way, the switching between the two well washing methods is realized by controlling the state of the sealing mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments described in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the air pipe hard pressure well washing process in the prior art;

[0020] Figure 2 Schematic diagram of the negative pressure suction well washing process in the prior art;

[0021] Figure 3 A schematic diagram of the overall external structure provided by an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of a partial cross-sectional structure provided by an embodiment of the present invention;

[0023] Figure 5 A schematic diagram of a partial cross-sectional structure provided in another embodiment of the present invention;

[0024] Figure 6 A schematic diagram of a locked state of a first locking portion provided in yet another embodiment of the present invention;

[0025] Figure 7 A schematic diagram of an unlocked state of a first locking portion provided in yet another embodiment of the present invention;

[0026] Figure 8 A schematic diagram of a locked state of a second locking portion provided in yet another embodiment of the present invention;

[0027] Figure 9 for Figure 8 A magnified schematic diagram of the local structure at point A.

[0028] Description of reference numerals:

[0029] 1. Drain pipe; 2. Air pipe; 3. Dewatering well; 4. Baffle; 401. First section; 402. Second section; 5. Housing; 6. Transmission plate; 7. Slide groove; 8. First spring; 9. Guide part; 10. First gear plate; 11. Second gear plate; 12. Gear; 13. Rotating shaft; 14. Locking rod; 15. Locking groove; 16. Pressure plate; 17. Abutment rod; 18. Abutment part; 19. Movable groove; 20. Second spring; 21. First locking part; 22. Second locking part; 23. U-shaped rod. DETAILED DESCRIPTION

[0030] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0031] In the description of the present invention, it is to be understood that Figure 5 The second section 402 is located above the first section 401, and vice versa. Figure 5 The position of the first section 401 relative to the transmission plate 6 is to the left, and vice versa. The terms "center", "length", "width", "up", "down", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" 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 simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, they should not be understood as limiting the present invention.

[0032] Reference Figure 1-9 The subway construction drainage system provided by an embodiment of the present invention includes an air compressor drainage mechanism, which includes a drainage pipe 1 and an air pipe 2 connected to the drainage pipe 1. A blocking mechanism is provided inside the drainage pipe 1; the blocking mechanism has a first state for closing the internal space of the drainage pipe 1 and a second state for making the internal space of the drainage pipe 1 conductive; and also includes a power component for switching the blocking mechanism between the first state and the second state.

[0033] Specifically, the drainage pipe 1 is a long pipe structure formed by threaded connection between multiple sections of pipes, the air pipe 2 is connected to the bottom end of the drainage pipe 1 (hereinafter referred to as the drainage pipe 1 specifically refers to the bottom end of the drainage pipe 1), and the air compressor drainage mechanism also includes a compressor. There are usually two ways to wash the well (or drain), namely the air pipe hard pressure type and the negative pressure suction type. The working principle of the air pipe hard pressure type is to insert a separate air pipe 2 into the precipitation well 3, and then input high-pressure gas into the precipitation well 3 through the compressor, and squeeze out the water and impurities (hereinafter referred to as water) inside the precipitation well 3 through the pressure of the gas (its advantages are fast cleaning efficiency and not easy to clog). , the disadvantage is high energy consumption). The working principle of the negative pressure suction type is: a drainage pipe 1 is laid inside the precipitation well 3, and an air pipe 2 is connected to the side wall of the drainage pipe 1. The outlet position of the air pipe 2 is located above the water inlet position of the drainage pipe 1. Air is injected into the air pipe 2 and the drainage pipe 1 through a compressor to make the inside of the drainage pipe 1 a negative pressure state, thereby discharging the water and impurities inside the precipitation well 3 (its advantage is low energy consumption, and its disadvantage is slow efficiency, and because the aperture of the drainage pipe 1 is smaller than that of the precipitation well 3, it is easy to be blocked). The above two well washing methods have their own advantages and disadvantages, and different ones are selected according to different construction conditions. Well washing method, this is the existing technology, will not be repeated. One of the core innovations of the embodiment of the present invention is that a blocking mechanism is provided inside the drain pipe 1, which can be a rotatable valve plate, and the blocking mechanism has a first state for closing the internal space of the drain pipe 1 and a second state for making the internal space of the drain pipe 1 conductive, and the end of the air pipe 2 connected to the drain pipe 1 is located between the blocking mechanism and the bottom end of the drain pipe 1. The effect of such a setting is that when the blocking mechanism is in the first state, the blocking mechanism blocks the space inside the drain pipe 1, so that the gas can only flow downward, and the gas flows directly through the air pipe 2 and the lower half of the drain pipe 1. It then enters the precipitation well 3 to press out the water inside the precipitation well 3, which is the air pipe hard pressure type well washing (based on the convenience of description, the following air pipe hard pressure type well washing method is referred to as the first state of the blocking mechanism). When the blocking mechanism is in the second state, the gas moves upward through the internal space of the drain pipe 1, so that the inside of the drain pipe 1 is in a negative pressure state, so that the water inside the precipitation well 3 can be extracted through the drain pipe 1, which is the negative pressure suction type well washing (based on the convenience of description, the following negative pressure suction type well washing method is referred to as the second state of the blocking mechanism). In this way, the switching between the two well washing methods can be achieved by controlling the state of the blocking mechanism.

[0034] Furthermore, the blocking mechanism is an electric valve, which is provided on the drain pipe 1. The electric valve is provided above the connection end between the air pipe 2 and the drain pipe 1, so that the electric valve controls the opening and closing of the internal space of the drain pipe 1, thereby realizing the passive switching of the blocking mechanism between the first state and the second state.

[0035] As another embodiment of the present invention, the blocking mechanism includes a baffle 4, a shell 5 is provided on the drain pipe 1, and the baffle 4 is slidably disposed inside the shell 5. Specifically, the baffle 4 has a plate-like structure, and its end close to the drain pipe 1 is semicircular, and is arranged along the radial direction of the drain pipe 1. When the semicircular end of the baffle 4 coincides with the internal space of the drain pipe 1, this is the first state of the blocking mechanism (when the blocking mechanism is in the first state, it is also the first state of the baffle 4). When the semicircular end of the baffle 4 is away from the internal space of the drain pipe 1, this is the second state of the blocking mechanism (when the blocking mechanism is in the second state, it is also the second state of the baffle 4).

[0036] Preferably, the housing 5 is provided with an inclined surface. Specifically, the housing 5 is arranged along the radial direction of the exhaust pipe 2, and the inclined surface is provided on the lower surface of the housing 5. The effect of such a configuration is that when the blocking mechanism is in the first state, the water inside the precipitation well 3 will be discharged through the space between the outer wall of the drain pipe 1 and the inner wall of the precipitation well 3. During this process, the water flow will contact the bottom of the housing 5. Therefore, the inclined surface below the housing 5 plays a guiding role to reduce the resistance during the drainage process.

[0037] It should be noted that when the baffle 4 is in the first state, the water inside the precipitation well 3 is forced out completely by the pressure of the gas, and when the baffle 4 is in the second state, the water is drained by negative pressure suction. Therefore, when the sealing mechanism is in the first state, the air pressure required is much greater than the pressure in the second state. Preferably, the power assembly includes a transmission plate 6, which is elastically arranged inside the shell 5, and the transmission plate 6 is fixedly connected to the baffle 4. The transmission plate 6 is located on the movement stroke of the gas inside the trachea 2. Specifically, the shell 5 divides the air pipe 2 into two sections, an upper section and an lower section, and a communication area is provided inside the shell 5. The two ends of the communication area are respectively connected to the air pipes 2 in the upper and lower sections. The transmission plate 6 is preferably a circular plate. A slide groove 7 is provided inside the shell 5. The transmission plate 6 is slidingly and sealingly connected to the slide groove 7. The elastic setting is that a first spring 8 is provided on the transmission plate 6. One end of the first spring 8 is fixed to the transmission plate 6, and the other end is fixed to the inner wall of the slide groove 7. The first spring 8 is always in a compressed state. The transmission plate 6 is located at the position where the slide groove 7 is connected to the internal space of the air pipe 2, that is, one circular surface of the transmission plate 6 is connected to the internal space of the slide groove 7, and the other circular surface is connected to the internal space of the air pipe 2. The effect of such a setting is that the baffle 4 is in the second state in the natural state. At this time, under the elastic force of the first spring 8, the transmission plate 6 is in the The rightmost end of the chute 7 is used to achieve the effect of slow water pumping. When there is too much water inside the precipitation well 3, the power of the compressor is increased, which will cause the pressure inside the air pipe 2 to increase dramatically, thereby generating a pressure on the transmission plate 6, causing the transmission plate 6 to slide to the left, thereby driving the baffle 4 to slide to the left synchronously to seal the internal space of the drain pipe 1 and squeeze the first spring 8, so that the baffle 4 is passively switched from the second state to the first state. When there is less water inside the precipitation well 3, the power of the compressor is reduced, so that the air pressure inside the air pipe 2 becomes smaller. When the air pressure inside the air pipe 2 is less than the elastic force of the first spring 8, the elastic force of the first spring 8 is released, thereby driving the baffle 4 to slide to the right to open the internal space of the drain pipe 1, so that the baffle 4 is passively switched from the first state to the second state.

[0038] Furthermore, when the drain pipe 1 is blocked, the air pressure inside the air pipe 2 is increased. Specifically, when the baffle 4 is in the first state, because the water flows upward through the drain pipe 1, it will drive the impurities inside the precipitation well 3 to move upward synchronously. When multiple hard impurities enter and get stuck inside the drain pipe 1, the drain pipe 1 will not drain smoothly, thereby reducing the drainage efficiency. When the impurities are not completely stuck, the compressor is turned off. At this time, the negative pressure effect inside the exhaust pipe 2 disappears, and the impurities fall under the action of their own gravity, thereby achieving the effect of passive blockage removal. When the impurities inside the drain pipe 1 are stuck too tightly, the blockage cannot be cleared by the gravity of the impurities alone. At this time, the power of the compressor is increased, so that the baffle 4 is switched from the second state to the first state. At this time, the high-pressure gas entering the drain pipe 1 will flow downward, thereby flushing the impurities inside the drain pipe 1 to achieve the effect of blockage removal.

[0039] It should be noted that whether the drain pipe 1 is blocked can be understood by the water output of the drain pipe 1, that is, when the water output is small, the drain pipe 1 is blocked, and when the water output is large, the drain pipe 1 is not blocked.

[0040] Furthermore, a guide portion 9 is provided inside the air pipe 2. Specifically, the guide portion 9 is provided at a position in the communication area inside the housing 5 and is a raised structure. The transmission plate 6 is provided on the opposite side of the raised guide portion 9, and the guide portion 9 is located on the movement path of the compressed gas inside the air pipe 2. The effect of this arrangement is that when the compressed gas enters the air pipe 2, it will come into contact with the guide portion 9. Under the action of the guide portion 9, the compressed gas rushes toward the transmission plate 6, thereby providing the transmission plate 6 with greater pressure, so that the baffle 4 can more stably switch from the second state to the first state.

[0041] As another embodiment of the present invention, the baffle 4 includes a first section 401 and a second section 402 that are slidably connected to each other. A speed-up component is provided between the first section 401 and the second section 402. When the first section 401 moves, the speed-up component drives the second section 402 to move twice. Specifically, a guide rail is provided on the upper surface of the first section 401, and the second section 402 is slidably connected to the guide rail. A circular end that is adapted to the internal space of the drain pipe 1 is provided on the second section 402. The first section 401 is fixedly connected to the transmission plate 6. The speed-up component can be an existing reciprocating drive component such as an electric push rod, which is provided on the first section 401. The purpose of such a setting is that, with respect to the baffle 4 being in the second state, when the air pressure inside the air pipe 2 increases, it will push the transmission plate 6 and the first section 401 to move synchronously. When the first section 401 moves, it will drive the speed-up component and the second section 402 at its output end to move synchronously. At the same time, the speed-up component and the second section 402 at its output end will move synchronously. The speed-up component works so that the second section 402 moves to the left along with the first section 401. Under the action of the speed-up component, the second section 402 is driven to move further to the left relative to the first section 401, so that the displacement distance of the second section 402 is twice the distance of the first section 401, so that the baffle 4 can be quickly switched from the second state to the first state. Conversely, when the baffle 4 is switched from the first state to the second state, the first section 401 moves to the right, and the speed-up component causes the displacement distance of the second section 402 to be twice the displacement distance of the first section 401, so that the baffle 4 can be quickly switched from the first state to the second state.

[0042] As an alternative to the above-mentioned electric push rod driving the movement of the second section 402, preferably, the speed-up component includes a first tooth plate 10 and a second tooth plate 11, the first tooth plate 10 is fixed to the inside of the housing 5, the second tooth plate 11 is arranged on the second section 402, and a gear 12 is provided on the first section 401, and the gear 12 is engaged with the first tooth plate 10 and the second tooth plate 11 at the same time. Specifically, a mounting groove is provided inside the first section 401, and a rotating shaft 13 is rotatably provided between the inner walls on both sides of the mounting groove. The gear 12 is fixed to the rotating shaft 13, and the first tooth plate 10 is fixed to the side wall of the slide groove 7 and is located below the gear 12. The second tooth plate 11 is provided on the lower surface of the second section 402, and the first tooth plate 10 and the second tooth plate 11 are both engaged with the gear 12, and the first tooth plate 10 and the baffle 4 are staggered with the first spring 8. The effect of such a setting is that when the first section 401 moves to the left, it will drive the gear 12 to move to the left synchronously. Under the action of the engagement of the gear 12 and the second tooth plate 11, the second tooth plate 11 and the second section 402 will be driven to move synchronously. Since the gear 12 is engaged with the first tooth plate 10 and the second tooth plate 11 at the same time, and since the first tooth plate 10 is fixed to the inside of the slide groove 7, the gear 12 will move horizontally. The moving side rotates itself, and while the gear 12 rotates itself, it drives the second tooth plate 11 to move leftward relative to the first section 401, so that the distance moved by the second section 402 is twice the distance moved by the first section 401. Similarly, when the first section 401 moves to the right, it will drive the tooth plate to move to the right while rotating in the opposite direction, so that the distance moved by the second section 402 is twice the distance moved by the first section 401. The advantages of such a setting are, first, it can speed up the switching speed of the baffle 4 between the first state and the second state, second, it can reduce the overall horizontal space occupied by the baffle 4, and can reduce the size of the shell 5 to reduce the blocking effect of the shell 5, thereby increasing the well washing rate, and third, there will be an overlapping part between the first section 401 and the second section 402, that is, the overlapping part will achieve secondary blocking to improve the overall sealing of the baffle 4.

[0043] It should be noted that controlling the baffle 4 in the first or second state by gas pressure is not stable enough and may cause the baffle 4 to wobble, thereby reducing the sealing effect of the baffle 4. Furthermore, a locking assembly is provided within the housing 5 for fixing the position of the baffle 4. Specifically, the locking assembly may be a structure composed of a blocking block and a cylinder. By extending and retracting the cylinder, the blocking block can be positioned within the movement range of the baffle 4 or away from the baffle 4, thereby achieving locking and unlocking of the baffle 4.

[0044] As an alternative to the above-mentioned cylinder driving the blocking block to move to achieve locking and unlocking of the baffle 4, the locking assembly includes a locking rod 14 elastically arranged inside the transmission plate 6, and the inner wall of the slide groove 7 is provided with a locking groove 15 adapted to the locking rod 14, a pressure plate 16 is slidably arranged on the transmission plate 6, an abutment rod 17 is provided on the pressure plate 16, and an abutment portion 18 is provided on the locking rod 14, and the abutment rod 17 abuts against the abutment portion 18. Specifically, there are two locking rods 14, and the two locking rods 14 are symmetrically arranged about the transmission plate 6, and the overall shape is approximately T-shaped. A movable groove 19 is opened inside the transmission plate 6, and the locking rod 14 is slidably connected to the movable groove 19. The elastic setting is that a second spring 20 is provided between the horizontal section of the locking rod 14 and the inner wall of the movable groove 19. A first locking portion 21 is provided on the end of the horizontal section of the locking rod 14. The pressure plate 16 is coaxially arranged with the transmission plate 6, and it can slide horizontally along the central axis of the transmission plate 6. The abutment portion 18 is provided at the locking rod 14 close to the transmission plate 6. On one end of the central axis of the plate 6, there is a wedge-shaped surface, and the abutment rod 17 is fixed to the surface of the pressure plate 16 close to the locking rod 14, and the abutment rod 17 abuts against the abutment portion 18. The effect of such a setting is that when the baffle 4 is in the second state, the first locking portion 21 is plugged into the locking groove 15. When the gas inside the trachea 2 flows, it will contact the pressure plate 16 and the transmission plate 6. Under the action of the first locking portion 21 plugged into the locking groove 15, the transmission plate 6 cannot move. Since the pressure is small at this time, the pressure plate 16 will only be slightly affected by the gas pressure. The first locking portion 21 will slide slightly inside the locking groove 15 during the shaking process, but the first locking portion 21 will not completely separate from the locking groove 15. At this time, the baffle 4 can be fixed in the second state without shaking horizontally, which increases the stability of the baffle 4 in the second state. When the pressure of the lifting compressor increases, the pressure plate 16 will drive the abutment rod 17 to slide toward the abutment portion 18. Under the action of the abutment rod 17 and the abutment portion 18, It will drive the first locking portion 21 to disengage from the locking groove 15 and store force on the second spring 20. At this time, the transmission plate 6 is unlocked, so that the baffle 4 can be switched from the second state to the first state. When the pressure of the compressor decreases, the elastic force of the first spring 8 is released, so that the transmission plate 6 slides in the opposite direction. When the first locking portion 21 overlaps with the locking groove 15, the elastic force of the second spring 20 is released, so that the first locking portion 21 can be inserted into the locking groove 15 again, thereby realizing passive unlocking and passive locking of the transmission plate 6 when it is at the rightmost end.

[0045] A U-shaped rod 23 is provided on the inner wall of the sliding groove 7 , and a second locking portion 22 is provided on the locking rod 14 . The U-shaped rod 23 is located on the movement stroke of the second locking portion 22 . The second locking portion 22 is engaged with the wedge-shaped portion of the U-shaped rod 23, so that the elastic force of the second spring 20 is partially released, thereby achieving When the second locking portion 22 is in contact with the wedge-shaped portion of the U-shaped rod 23, the pressure on the pressure plate 16 causes the first locking portion 21 to slide further toward the inside of the movable groove 19, thereby inserting the second locking portion 22 into the slot to lock the transmission plate 6 at the leftmost end, thereby locking the baffle 4 in the first state. At this time, when the pressure plate 16 is subjected to a slight pressure change, the second locking portion 22 will slide repeatedly inside the slot. During this sliding process, the baffle 4 is always in the locked state, thereby improving the stability of the baffle 4 in the first state. When the pressure of the compressor becomes smaller, the elastic force of the second spring 20 is released, thereby causing the second locking portion 22 to be completely withdrawn from the slot to unlock the transmission plate 6. At this time, the transmission plate 6 automatically returns to its original position under the elastic force of the first spring 8, thus realizing passive unlocking and passive locking of the transmission plate 6 at the leftmost end.

[0046] The above description is merely illustrative of certain exemplary embodiments of the present invention. It goes without saying that those skilled in the art will be able to modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and description are illustrative in nature and should not be construed as limiting the scope of protection of the claims.

Claims

1. A subway construction drainage system, comprising an air compressor drainage mechanism, wherein the air compressor drainage mechanism comprises a drainage pipe and an air pipe connected to the drainage pipe, characterized in that: A blocking mechanism is provided inside the drainage pipe; The blocking mechanism has a first state for closing the internal space of the drain pipe and a second state for opening the internal space of the drain pipe; It also includes a power component for switching the blocking mechanism between the first state and the second state.

2. The subway construction drainage system according to claim 1, characterized in that: The blocking mechanism is an electric valve, and the electric valve is arranged on the drain pipe.

3. The subway construction drainage system according to claim 2, characterized in that: The blocking mechanism comprises a baffle, a shell is arranged on the drain pipe, and the baffle is slidably arranged inside the shell.

4. The subway construction drainage system according to claim 3, characterized in that: The shell is provided with an inclined surface.

5. The subway construction drainage system according to claim 3, characterized in that: The power assembly comprises a transmission plate, which is elastically arranged inside the housing, fixedly connected to the baffle, and located on the movement stroke of the gas inside the air pipe.

6. The subway construction drainage system according to claim 5, characterized in that: When the drain pipe is blocked, the air pressure inside the air pipe is increased.

7. The subway construction drainage system according to claim 5, characterized in that: A guide portion is arranged inside the air pipe.

8. The subway construction drainage system according to claim 5, characterized in that: The baffle includes a first section and a second section which are slidably connected to each other, and a speed-up component is arranged between the first section and the second section. When the first section moves, the speed-up component drives the second section to move twice.

9. The subway construction drainage system according to claim 8, characterized in that: The speed-up assembly includes a first tooth plate and a second tooth plate, the first tooth plate is fixed to the inside of the housing, the second tooth plate is arranged on the second section, a gear is arranged on the first section, and the gear is meshed with the first tooth plate and the second tooth plate at the same time.

10. The subway construction drainage system according to claim 9, characterized in that: A locking assembly for fixing the position of the baffle is arranged inside the shell.

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