Underground buoyancy type multi-stage lifting water retaining structure

Abstract

The present application belongs to waterproof structure technical field, especially disclose a kind of underground buoyancy formula multi-stage lifting water retaining structure, including bottom plate, and two oppositely arranged wall body of installation in bottom plate top, the top surface of bottom plate between two wall body is provided with the protrusion of isosceles trapezoidal structure, and the bottom side of protrusion two sides inclined surface is flush with the top surface of bottom plate, the top surface of protrusion equidistance and parallelly arranged first recess, second recess and third recess, and the depth of first recess, second recess and third recess decreases in steps.The present application is blocked by buoyancy frame and support frame cooperation when waterlogging, when the horizontal plane of waterlogging is higher than the top surface of support frame in first recess top, the buoyancy frame in second recess inside is moved up in the buoyancy of waterlogging, waterlogging is blocked using support frame in second recess inside, by stage waterlogging blocking, without all opening all water retaining components, improve the water retaining efficiency of entire water retaining structure.

Description

Technical Field

[0001] The present invention belongs to the technical field of waterproof structures, and in particular relates to an underground buoyancy type multi-stage lifting water retaining structure. Background Art

[0002] Heavy rain and typhoons can cause backflow, leading to severe property damage and threats to personal safety. Traditional garages and warehouses, for example, often lack adequate waterproofing. Instead, they often connect to underground sewers via ground-covered gratings. However, during heavy rain, rainwater can still flow back in, requiring workers to stack sandbags to prevent it. This process is time-consuming, labor-intensive, and inefficient, failing to prevent the flow in time.

[0003] Therefore, it is necessary to invent an underground buoyancy type multi-stage lifting water retaining structure to solve the above problems. Summary of the Invention

[0004] In response to the above problems, the present invention provides an underground buoyancy multi-stage lifting water retaining structure to solve the problems raised in the above background technology:

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: an underground buoyancy type multi-stage lifting water retaining structure, comprising a base plate, and two oppositely arranged walls installed on the top of the base plate, the top surface of the base plate between the two walls is provided with a protrusion of an isosceles trapezoidal structure, and the bottom side edges of the inclined surfaces on both sides of the protrusion are flush with the top surface of the base plate, the top surface of the protrusion is equidistantly provided with a first groove, a second groove and a third groove, and the depths of the first groove, the second groove and the third groove are stepped down, a drainage groove penetrating the base plate is provided at the center of the bottom of the first groove, the second groove and the third groove, and the base plate is connected to the external drainage system via the drainage groove, lifting structures for blocking accumulated water are placed inside the first groove, the second groove and the third groove, the top surfaces of the multiple lifting structures are correspondingly flush, and a drainage structure corresponding to the bottom surface of the lifting structure is provided inside the drainage groove.

[0006] Furthermore, the lifting structure includes a buoyancy frame, the interior of the buoyancy frame is set as a hollow structure, and the top surface and front side of the buoyancy frame are provided with multiple water inlets, the surface and inner wall of the buoyancy frame are correspondingly installed with buoyancy plates, and the top of the buoyancy frame is covered with a support frame, the bottom surface of the support frame is correspondingly fitted with the top surface of the buoyancy plate, the top surface of the support frame is flush with the top openings of the first groove, the second groove and the third groove, and the top of the support frame is provided with a through opening corresponding to the water inlet at the top of the buoyancy frame.

[0007] Furthermore, a baffle is installed at the bottom of the rear side of the support frame, and the bottom surface of the baffle is flush with the bottom surface of the buoyancy plate. Square and round rods are fixedly connected to the centers of the two end surfaces of the support frame, and three groups of vertical grooves are provided on the relative inner sides of the two walls. The support frame uses the square and round rods at both ends to buckle on the inner sides of the vertical grooves of the two walls. The bottom ends of the three groups of vertical grooves are on the same horizontal plane, the lengths of the three groups of vertical grooves increase in steps, and the three groups of vertical grooves correspond to the first groove, the second groove and the third groove, respectively.

[0008] Furthermore, partitions are installed between the first groove and the second groove and between the second groove and the third groove respectively. The top edge of the partition is flush with the top surface of the support frame. The cross-sectional shape of the bottom structure of the support frame is set to a gourd-mouth structure, and the bottom opening of the support frame corresponds to the drainage groove.

[0009] Furthermore, the bottoms of the first groove, the second groove and the third groove are all snap-fitted to the bottom of the support frame, the square and round rods at both ends of the support frame are at the bottom of the vertical groove, and the bottom of the buoyancy frame is correspondingly fitted to the top surface of the drainage structure.

[0010] Furthermore, the drainage structure includes an inner frame, the top and bottom surfaces of the inner frame are provided with through grooves corresponding to the drainage grooves, side grooves are provided on both sides of the inner frame, two semicircular rods are provided opposite to each other inside the inner frame, and the outer side surfaces of the circumference of the semicircular rods are connected to the inner ends of the elastic strips passing through the side grooves, and the inner planes of the two semicircular rods are arranged opposite to each other.

[0011] Furthermore, relative movable grooves are provided on the two inner side walls of the drainage trough, and inner rods hinged to the outer ends of the two elastic strips are provided inside the two movable grooves. The bottom end of the buoyancy frame corresponds to the top surface of the inner frame, and the buoyancy frame is correspondingly installed inside the first groove. The elastic strip is in a stretched state, and the bottom surface of the buoyancy frame is tightly fitted with the top surface of the inner frame.

[0012] Furthermore, the inner side surfaces of the two semicircular rods are arranged opposite to each other, and the two semicircular rods are fixedly connected with an inner plate, and the top surface and bottom surface of the inner plate are flush with the top surface and bottom surface of the inner frame respectively. Both ends of the inner frame are provided with transverse grooves, and the two ends of the two semicircular rods are respectively snapped into the two transverse grooves.

[0013] Technical effects and advantages of the present invention:

[0014] 1. The present invention cooperates with a buoyancy frame and a support frame to block accumulated water. When the level of the accumulated water is higher than the top surface of the support frame at the top of the first groove, the buoyancy of the buoyancy frame inside the second groove in the accumulated water causes the buoyancy frame to move upward, and the support frame inside the second groove is used to block the accumulated water. By blocking the accumulated water in stages, there is no need to open all the water-blocking components, thereby improving the water-blocking efficiency of the entire water-blocking structure.

[0015] 2. In the present invention, the accumulated water flows from the support frame at the top of the first groove into the inside of the second groove, and the drainage trough of the second groove is used to discharge the accumulated water. The buoyancy frame and the support frame inside the second groove are used to block the accumulated water inside the second groove. Similarly, the buoyancy frame and the support frame inside the third groove can also be used to block the accumulated water inside the third groove. By blocking and discharging the accumulated water in stages, the accumulated water is prevented from entering the garage, thereby improving the water-retaining effect of the entire water-retaining structure and being able to block the accumulated water in time.

[0016] 3. After the present invention discharges the accumulated water through the drainage trough, the buoyancy frame and the support frame gradually move downward until the bottom end of the buoyancy frame is in contact with the top surface of the inner frame. When the buoyancy frame and the support frame drive the inner frame to move downward, the two semicircular rods inside the inner frame pull the inner end of the elastic strip during the process of separation, and the outer end of the elastic strip rotates on the inner rod surface of the movable groove, and the elastic force of the elastic strip is used to prevent the bottom of the buoyancy frame from directly impacting the inner bottom surface of the first groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is an overall three-dimensional diagram of an underground buoyant multi-stage lifting water retaining structure according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the overall connection between the bottom plate and the wall according to an embodiment of the present invention;

[0019] Figure 3 2. It is a schematic diagram of the explosion structure corresponding to the buoyancy frame and the support frame according to an embodiment of the present invention;

[0020] Figure 4 This is a perspective structural diagram of the overall cross section of an underground buoyancy-type multi-stage lifting water retaining structure according to an embodiment of the present invention;

[0021] Figure 5 This is an embodiment of the present invention Figure 4 A magnified view of the structure of part A;

[0022] Figure 6 This is a schematic diagram of the three-dimensional structure of the inner frame portion of an embodiment of the present invention;

[0023] In the figure: 1. bottom plate; 2. wall; 3. first groove; 4. second groove; 5. third groove; 6. drainage trough; 7. buoyancy frame; 8. water inlet; 9. buoyancy plate; 10. support frame; 11. baffle; 12. square and round rods; 13. vertical groove; 14. partition; 15. inner frame; 16. side groove; 17. semicircular rod; 18. elastic strip; 19. inner rod; 20. inner plate; 21. horizontal groove. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments.

[0025] The present invention provides an underground buoyancy type multi-stage lifting water retaining structure, such as Figures 1 to 4 As shown, it includes a base plate 1 and two oppositely arranged walls 2 installed on the top of the base plate 1. The top surface of the base plate 1 between the two walls 2 is provided with a protrusion of an isosceles trapezoidal structure, and the bottom side edges of the inclined surfaces on both sides of the protrusion are flush with the top surface of the base plate 1. The top surface of the protrusion is equidistantly provided with a first groove 3, a second groove 4 and a third groove 5, and the depths of the first groove 3, the second groove 4 and the third groove 5 are stepped down. A drainage groove 6 that passes through the base plate 1 is provided at the center of the bottom of the first groove 3, the second groove 4 and the third groove 5, and the base plate 1 is connected to the external drainage system via the drainage groove 6. Lifting structures for blocking accumulated water are placed inside the first groove 3, the second groove 4 and the third groove 5. The top surfaces of the multiple lifting structures are flush with each other, and a drainage structure corresponding to the bottom surface of the lifting structure is provided inside the drainage groove 6. The base plate 1 is installed inside the ground, and the top surface of the base plate 1 is flush with the ground. When there is no water outside, multiple lifting structures are placed inside the first groove 3, the second groove 4 and the third groove 5 respectively, and the top surface of the lifting structure is flush with the top surface of the protrusion. The vehicle enters the garage using the multiple lifting structures on the inner top surface of the protrusion.

[0026] When water accumulates on the outside ground and gradually enters the garage through the protrusion, the first groove 3, the second groove 4 and the third groove 5 can block and isolate the accumulated water in stages, and the accumulated water entering the first groove 3, the second groove 4 and the third groove 5 will pass through the drainage groove 6 into the external drainage system, completing the discharge of the accumulated water in the first groove 3, the second groove 4 and the third groove 5.

[0027] Since the lifting structure inside the third groove 5 is higher than the lifting structure inside the second groove 4, and the lifting structure inside the second groove 4 is higher than the lifting structure inside the first groove 3, the accumulated water enters the first groove 3, and the buoyancy of the lifting structure enables the lifting structure to block the accumulated water inside the first groove 3. When the accumulated water level is higher than the highest position of the lifting structure inside the first groove 3, the accumulated water gradually enters the second groove 4, and the lifting structure inside the second groove 4 is used to block the accumulated water again. Similarly, the lifting structure inside the third groove 5 is used to block the accumulated water that is higher than the highest position of the lifting structure inside the second groove 4. The accumulated water is blocked in stages by buoyancy lifting.

[0028] exist Figure 1 and Figure 3In the embodiment, the lifting structure includes a buoyancy frame 7, which is hollow inside and has multiple water inlets 8 on its top and front sides. Buoyancy plates 9 are installed on the surface and inner sidewalls of the buoyancy frame 7. A support frame 10 is placed on the top of the buoyancy frame 7. The bottom surface of the support frame 10 is aligned with the top surface of the buoyancy plate 9. The top surface of the support frame 10 is flush with the top openings of the first groove 3, the second groove 4, and the third groove 5. The top of the support frame 10 is provided with a through opening that matches the water inlet 8 on the top of the buoyancy frame 7. The three buoyancy frames 7 are placed in the first groove 3, the second groove 4, and the third groove 5, respectively. The height of the buoyancy frames 7 in the first groove 3, the second groove 4, and the third groove 5 gradually increases. After the support frame 10 is placed on the top of the buoyancy frame 7, the weight of the support frame 10 and the buoyancy frame 7 itself makes the top surface of the support frame 10 flush with the top surface of the protrusion.

[0029] When the accumulated water enters the first groove 3, the accumulated water will also enter the buoyancy frame 7 through the through-hole at the top of the support frame 10 and the multiple water inlets 8 of the buoyancy frame 7. The accumulated water will gradually be discharged into the drainage trough 6 through the bottom opening of the buoyancy frame 7, and the accumulated water inside the first groove 3 will be discharged using the drainage trough 6.

[0030] exist Figures 1 to 3 In the figure, a baffle 11 is installed at the bottom of the rear side of the support frame 10, and the bottom surface of the baffle 11 is flush with the bottom surface of the buoyancy plate 9. The centers of the two end surfaces of the support frame 10 are fixedly connected with square rods 12. The two walls 2 are provided with three groups of vertical grooves 13 on the opposite inner sides. The support frame 10 uses the square rods 12 at both ends to buckle on the inner sides of the vertical grooves 13 of the two walls 2. The bottom ends of the three groups of vertical grooves 13 are on the same horizontal plane. The lengths of the three groups of vertical grooves 13 are stepped up, and the three groups of vertical grooves 13 correspond to the first groove 3, the second groove 4 and the third groove 5, respectively. When the accumulated water accumulates inside the first groove 3, the buoyancy of the surface of the buoyancy frame 7 and the buoyancy plate 9 installed on the inner wall in the accumulated water drives the buoyancy frame 7 to move upward. Since the weight of the support frame 10 itself is pressed on the top of the buoyancy frame 7, the buoyancy frame 7 drives the support frame 10 to move upward synchronously inside the first groove 3. The support frame 10 uses the square rod 12 to move upward smoothly inside the vertical groove 13. Due to the limitation of the vertical groove 13 on the square rod 12, the support frame 10 is prevented from separating from the top of the buoyancy frame 7 during the upward movement.

[0031] The buoyancy frame 7 pushes up the support frame 10 at the bottom of the buoyancy, until the square round rod 12 moves to the top of the vertical slot 13, at this time the buoyancy frame 7 inside the first groove 3 reaches the highest position, the back side of the support frame 10 is connected to the baffle 11 at the bottom, which blocks the accumulated water at the top of the first groove 3 from entering the second groove 4, when the water level is higher than the top surface of the support frame 10 at the top of the first groove 3, the buoyancy of the buoyancy frame 7 in the water inside the second groove 4 causes the buoyancy frame 7 to move upwards, and the support frame 10 inside the second groove 4 blocks the water, and through the phased water blocking, the entire water blocking structure improves the water blocking efficiency.

[0032] In Figures 1 to 4 The first groove 3 and the second groove 4 are correspondingly installed with a partition plate 14, the top edge of the partition plate 14 is flush with the top surface of the support frame 10, the cross-sectional profile of the bottom structure of the support frame 10 is set as a gourd-shaped structure, and the opening at the bottom of the support frame 10 corresponds to the drainage groove 6. When the water enters the first groove 3, the partition plate 14 between the first groove 3 and the second groove 4 can prevent the water in the first groove 3 from entering the second groove 4, and when the water enters the second groove 4, the partition plate 14 between the second groove 4 and the third groove 5 can prevent the water in the second groove 4 from entering the third groove 5. If the water level outside is lower than the highest position of the support frame 10 inside the first groove 3, at this time the support frame 10 inside the first groove 3 corresponds to the baffle 11 and the partition plate 14, preventing the water in the first groove 3 from entering the second groove 4, and there is no need to use the second groove 4 and the third groove 5 to drain the water.

[0033] The bottom of the first groove 3, the second groove 4 and the third groove 5 corresponds to the buckle of the bottom of the support frame 10, the square round rod 12 at both ends of the support frame 10 is at the bottom end of the vertical slot 13, and the bottom of the buoyancy frame 7 corresponds to the top surface of the drainage structure. After a plurality of buoyancy frames 7 and support frames 10 are placed inside the first groove 3, the second groove 4 and the third groove 5, when the vehicle drives on the top surface of the support frame 10, the support frame 10 uses the square round rod 12 at both ends to correspond to the bottom end of the vertical slot 13, and uses the support frame 10 to protect the buoyancy frame 7 itself, avoiding the weight of the vehicle being applied to the top of the buoyancy frame 7, and avoiding the buoyancy frame 7 being squeezed and damaged in the process of vehicle driving.

[0034] In Figures 4 to 6In the embodiment, the drainage structure includes an inner frame 15, the top and bottom surfaces of which are provided with through grooves corresponding to the drainage groove 6, and side grooves 16 are provided on both sides of the inner frame 15. Two semicircular rods 17 are arranged opposite each other inside the inner frame 15, and the inner ends of elastic strips 18 that pass through the side grooves 16 are connected to the outer circumferential surfaces of the semicircular rods 17, and the inner planes of the two semicircular rods 17 are arranged opposite each other. The buoyancy frame 7 and the support frame 10 are entirely located inside the first groove 3, and after the top surface of the support frame 10 is flush with the top surface of the protrusion, the weight of the buoyancy frame 7 and the support frame 10 is applied to the top surface of the inner frame 15. Under the heavy pressure, the inner frame 15 moves downward inside the drainage groove 6. Due to the pulling of the elastic strips 18 on the semicircular rods 17, the downward movement of the inner frame 15 causes the two semicircular rods 17 to separate, and the elastic strips 18 are in a stretched state during the downward movement of the inner frame 15.

[0035] The two inner side walls of the drainage trough 6 are provided with relative movable grooves, and the two movable grooves are each provided with an inner rod 19 hinged to the outer ends of the two elastic strips 18. The bottom end of the buoyancy frame 7 corresponds to the top surface of the extruded inner frame 15, and the buoyancy frame 7 is correspondingly installed inside the first groove 3. The elastic strip 18 is in a stretched state, and the bottom surface of the buoyancy frame 7 is tightly fitted with the top surface of the inner frame 15.

[0036] When the inner frame 15 moves downward, the two semicircular rods 17 inside the inner frame 15 pull the inner end of the elastic strip 18 during the process of separating from each other, and the outer end of the elastic strip 18 rotates on the surface of the inner rod 19 of the movable groove, utilizing the elastic force of the elastic strip 18 to prevent the bottom of the buoyancy frame 7 from directly impacting the inner bottom surface of the first groove 3.

[0037] exist Figures 4 to 6 In the embodiment, the inner side surfaces of the two semicircular rods 17 are arranged opposite each other, and the two semicircular rods 17 are fixedly connected to the inner plate 20, and the top and bottom surfaces of the inner plate 20 are respectively flush with the top and bottom surfaces of the inner frame 15. The inner frame 15 is provided with a transverse groove 21 at both ends, and the two ends of the two semicircular rods 17 are respectively snapped into the two transverse grooves 21. When accumulated water enters the first groove 3, the accumulated water also enters the buoyancy frame 7 through the water inlet 8 of the buoyancy frame 7. The accumulated water in the first groove 3 is gradually discharged into the drainage system through the drainage groove 6. When the flow rate of accumulated water entering the first groove 3 is less than or equal to the flow rate of the first groove 3 to discharge the accumulated water, the accumulated water cannot accumulate in the first groove 3.

[0038] When the flow rate of accumulated water entering the first groove 3 is greater than the flow rate of the first groove 3 to discharge the accumulated water, the accumulated water gradually accumulates in the first groove 3 due to the limitation of the partition 14, and the buoyancy of the buoyancy plate 9 drives the buoyancy frame 7 to move upward until the support frame 10 is correspondingly buckled at the top of the vertical groove 13 using the square rod 12. When the buoyancy frame 7 moves upward, the elastic force of the elastic strip 18 uses the semicircular rod 17 to pull the inner frame 15 upward inside the drainage trough 6. The elastic force of the elastic strip 18 makes the top surface of the inner frame 15 always fit with the bottom of the buoyancy frame 7, and the two semicircular rods 17 gradually approach each other during the process of being on the inner frame 15. Due to the impact force of the discharge of accumulated water, the inner plates 20 connected by the two semicircular rods 17 are prevented from fitting each other. However, the elastic strip 18 connecting the two inner plates 20 reduces the water outlet of the through groove of the inner frame 15, making it easier for the accumulated water to accumulate in the first groove 3. The buoyancy frame 7 and the support frame 10 at the top of the first groove 3 cooperate to block the accumulated water.

[0039] The accumulated water flows from the support frame 10 at the top of the first groove 3 into the second groove 4, and the drainage groove 6 of the second groove 4 is used to discharge the accumulated water. The buoyancy frame 7 and the support frame 10 inside the second groove 4 are used to block the accumulated water inside the second groove 4. Similarly, the buoyancy frame 7 and the support frame 10 inside the third groove 5 can also be used to block the accumulated water inside the third groove 5. By blocking and discharging the accumulated water in stages, the accumulated water is prevented from entering the garage, thereby improving the water-retaining effect of the entire water-retaining structure and being able to block the accumulated water in time.

[0040] Working principle of the present invention:

[0041] Refer to the accompanying drawings in the specification Figures 1 to 6 , the bottom plate 1 is installed correspondingly inside the ground, and the top surface of the bottom plate 1 is flush with the ground. When there is no water accumulation outside, multiple groups of buoyancy frames 7 and support frames 10 are placed correspondingly inside the first groove 3, the second groove 4 and the third groove 5. When the vehicle travels on the top surface of the support frame 10, the support frame 10 uses the square and round rods 12 at both ends to cooperate with the bottom end of the vertical groove 13, and uses the support frame 10 to protect the buoyancy frame 7 itself, avoiding the weight of the vehicle being applied to the top of the buoyancy frame 7, and avoiding the buoyancy frame 7 from being squeezed and damaged during the driving of the vehicle due to the weight of the vehicle.

[0042] When water accumulates on the outside ground and gradually enters the garage through the protrusion, the first groove 3, the second groove 4 and the third groove 5 can block and isolate the accumulated water in stages, and the accumulated water entering the first groove 3, the second groove 4 and the third groove 5 will pass through the drainage groove 6 into the external drainage system, completing the discharge of the accumulated water in the first groove 3, the second groove 4 and the third groove 5.

[0043] When the accumulated water enters the first groove 3, the accumulated water also enters the buoyancy frame 7 through the water inlet 8 of the buoyancy frame 7. The accumulated water inside the first groove 3 is gradually discharged into the drainage system through the drainage groove 6. When the flow rate of the accumulated water entering the first groove 3 is less than or equal to the flow rate of the first groove 3 discharging the accumulated water, the accumulated water cannot accumulate inside the first groove 3.

[0044] When the flow rate of accumulated water entering the first groove 3 is greater than the flow rate of the first groove 3 to discharge the accumulated water, the accumulated water gradually accumulates in the first groove 3 due to the limitation of the partition 14, and the buoyancy of the buoyancy plate 9 drives the buoyancy frame 7 to move upward until the support frame 10 is correspondingly buckled at the top of the vertical groove 13 using the square rod 12. When the buoyancy frame 7 moves upward, the elastic force of the elastic strip 18 uses the semicircular rod 17 to pull the inner frame 15 upward on the inner side of the drainage trough 6. The elastic force of the elastic strip 18 makes the top surface of the inner frame 15 always fit with the bottom of the buoyancy frame 7, and the two semicircular rods 17 gradually approach each other during the process of being on the inner frame 15. Due to the discharge of accumulated water, the inner plates 20 connected by the two semicircular rods 17 are prevented from fitting each other. However, the elastic strip 18 connecting the two inner plates 20 reduces the water outlet of the through groove of the inner frame 15, which facilitates the accumulation of accumulated water in the first groove 3. The buoyancy frame 7 and the support frame 10 at the top of the first groove 3 cooperate to block the accumulated water.

[0045] The accumulated water flows from the support frame 10 at the top of the first groove 3 into the second groove 4, and the drainage groove 6 of the second groove 4 is used to discharge the accumulated water. The buoyancy frame 7 and the support frame 10 inside the second groove 4 are used to block the accumulated water inside the second groove 4. Similarly, the buoyancy frame 7 and the support frame 10 inside the third groove 5 can also be used to block the accumulated water inside the third groove 5. By blocking and discharging the accumulated water in stages, the accumulated water is prevented from entering the garage, thereby improving the water retaining effect of the entire water retaining structure.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same.

Claims

1. An underground buoyancy-type multi-stage lifting water retaining structure, comprising a bottom plate (1), and two oppositely arranged walls (2) mounted on the top of the bottom plate (1), characterized in that: The top surface of the bottom plate (1) between the two walls (2) is provided with a convex block of an isosceles trapezoidal structure, and the bottom side edges of the inclined surfaces on both sides of the convex block are flush with the top surface of the bottom plate (1); the top surface of the convex block is provided with a first groove (3), a second groove (4) and a third groove (5) at equal intervals, and the depths of the first groove (3), the second groove (4) and the third groove (5) decrease in a stepwise manner; a drainage groove (6) penetrating the bottom plate (1) is provided at the center of the bottom of each of the first groove (3), the second groove (4) and the third groove (5); and the bottom plate (1) is connected to an external drainage system by means of the drainage groove (6); a lifting structure for blocking accumulated water is placed inside the first groove (3), the second groove (4) and the third groove (5); the top surfaces of the plurality of lifting structures are flush with each other, and a drainage structure corresponding to the bottom surface of the lifting structure is provided inside the drainage groove (6); The lifting structure includes a buoyancy frame (7), the interior of the buoyancy frame (7) is set as a hollow structure, and the top surface and front side surface of the buoyancy frame (7) are both provided with a plurality of water inlets (8), the surface and inner side wall of the buoyancy frame (7) are both correspondingly installed with buoyancy plates (9), the top of the buoyancy frame (7) is correspondingly covered with a support frame (10), the bottom surface of the support frame (10) is correspondingly fitted with the top surface of the buoyancy plate (9), the top surface of the support frame (10) is correspondingly flush with the top openings of the first groove (3), the second groove (4) and the third groove (5), and the top of the support frame (10) is provided with a through opening corresponding to the water inlet (8) at the top of the buoyancy frame (7).

2. The underground buoyancy multi-stage lifting water retaining structure according to claim 1 is characterized in that: A baffle (11) is installed at the bottom of the rear side of the support frame (10), and the bottom surface of the baffle (11) is flush with the bottom surface of the buoyancy plate (9). The centers of the two end surfaces of the support frame (10) are fixedly connected with square rods (12). The two walls (2) are provided with three groups of vertical grooves (13). The support frame (10) uses the square rods (12) at both ends to be correspondingly buckled on the inner sides of the vertical grooves (13) of the two walls (2). The bottom ends of the three groups of vertical grooves (13) are on the same horizontal plane. The lengths of the three groups of vertical grooves (13) are stepped up, and the three groups of vertical grooves (13) correspond to the first groove (3), the second groove (4) and the third groove (5), respectively.

3. The underground buoyancy multi-stage lifting water retaining structure according to claim 2 is characterized in that: A partition plate (14) is correspondingly installed between the first groove (3) and the second groove (4) and between the second groove (4) and the third groove (5); the top edge of the partition plate (14) is flush with the top surface of the support frame (10); the cross-sectional shape of the bottom structure of the buoyancy frame (7) is set to a gourd-shaped structure, and the bottom opening of the buoyancy frame (7) corresponds to the drainage groove (6).

4. The underground buoyancy multi-stage lifting water retaining structure according to claim 3 is characterized in that: The bottoms of the first groove (3), the second groove (4) and the third groove (5) are all snap-fitted to the bottom of the support frame (10), the square and round rods (12) at both ends of the support frame (10) are located at the bottom ends of the vertical grooves (13), and the bottom of the buoyancy frame (7) is correspondingly fitted to the top surface of the drainage structure.

5. The underground buoyancy multi-stage lifting water retaining structure according to claim 1 is characterized in that: The drainage structure comprises an inner frame (15), the top and bottom surfaces of the inner frame (15) are both provided with through grooves corresponding to the drainage grooves (6), side grooves (16) are both provided on both sides of the inner frame (15), two semicircular rods (17) arranged opposite to each other are arranged inside the inner frame (15), and the outer circumferential sides of the semicircular rods (17) are connected to the inner ends of elastic strips (18) passing through the side grooves (16), and the inner planes of the two semicircular rods (17) are arranged opposite to each other.

6. The underground buoyancy type multi-stage lifting water retaining structure according to claim 5 is characterized in that: The two inner side walls of the drainage trough (6) are provided with relative movable grooves, and the inside of the two movable grooves is provided with an inner rod (19) hinged to the outer ends of the two elastic strips (18). The bottom end of the buoyancy frame (7) corresponds to the top surface of the inner frame (15), and the buoyancy frame (7) is correspondingly installed inside the first groove (3), the second groove (4) and the third groove (5). The elastic strip (18) is in a stretched state, and the bottom surface of the buoyancy frame (7) is tightly fitted with the top surface of the inner frame (15).

7. The underground buoyancy multi-stage lifting water retaining structure according to claim 5, characterized in that: The inner side surfaces of the two semicircular rods (17) are arranged opposite to each other, and the two semicircular rods (17) are fixedly connected with an inner plate (20), and the top surface and the bottom surface of the inner plate (20) are flush with the top surface and the bottom surface of the inner frame (15), respectively. Both ends of the inner frame (15) are provided with transverse grooves (21), and the two ends of the two semicircular rods (17) are respectively correspondingly buckled in the inside of the two transverse grooves (21).

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