A pneumatic sealing device for bridge deck drainage holes

Abstract

A pneumatic sealing device for bridge deck drainage holes, relating to the field of bridge drainage technology, includes an inner liner and an expansion valve body. The expansion valve body is housed within the inner liner, which is installed in each drainage hole on the side of the bridge deck near the guardrail. The side of the inner liner is connected to the inner wall of the drainage hole. A connector is provided within the inner liner, and the expansion valve body is mounted on the connector. An air guide pipe is provided at the upper end of the expansion valve body, and the air guide pipe is connected to a compressed air source installed on the bridge deck. This invention seals and drains the bridge deck drainage holes by expanding and contracting the air bladder on the side of the expansion valve body, effectively preventing hazardous chemicals from entering the water body. By setting a sliding rod, the air bladder is stretched during inflation, increasing the contact area between the air bladder and the drainage hole. During retraction, the air bladder contracts, facilitating separation of the air bladder from the drainage hole and reducing the air bladder volume. A sealing ring and sealing groove are provided in conjunction to perform secondary sealing of the drainage holes, improving the sealing effect.

Description

Technical Field

[0001] This utility model relates to the field of bridge drainage technology, and in particular to a pneumatic sealing device for bridge deck drainage holes. Background Technology

[0002] Currently, many bridges spanning rivers in China are equipped with drainage holes on their decks. Most of these drainage holes are of the direct discharge type, which discharges the collected liquid directly into the water bodies below. If an emergency occurs on the bridge deck, such as a vehicle transporting hazardous chemicals encountering an accident or a hazardous chemical leak, the bridge may lack the capacity to respond. The hazardous chemicals will then be discharged into the water bodies through the pipes, causing serious damage to the ecological environment. If this occurs in a drinking water source area, it poses a significant safety threat to a large number of people.

[0003] To address the aforementioned issues, some older bridges have undergone renovations and upgrades, including the installation of devices such as drainage covers to close the drainage holes. However, these devices require on-site operation by staff, making it difficult to respond promptly to emergencies and posing a significant threat to the personal safety of on-site operators. Furthermore, these liquid hazardous chemicals can seep into the bridge deck through the gaps between the cover and the deck, resulting in poor sealing and difficulty in effectively protecting the water below. Therefore, we propose a pneumatic sealing device for the bridge deck drainage holes. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this utility model discloses a pneumatic sealing device for bridge deck drainage holes. This utility model achieves rapid sealing and drainage of bridge deck drainage holes by setting an expansion valve body inside the inner liner, effectively preventing hazardous chemicals from entering the water body.

[0005] To achieve the aforementioned objective, this utility model adopts the following technical solution:

[0006] A pneumatic sealing device for bridge deck drainage holes includes an inner liner and an expansion valve body. The expansion valve body is housed inside the inner liner. The inner liner is installed in each drainage hole on the side of the bridge deck near the guardrail. The side of the inner liner is connected to the inner wall of the drainage hole. A connector is provided inside the inner liner. The expansion valve body is installed on the connector. An air guide pipe is provided at the upper end of the expansion valve body. The air guide pipe is connected to a compressed air source installed on the bridge deck.

[0007] The inner liner has a water grate at the upper opening, and an air vent pipe passes through the water grate. An air release valve is provided on the air vent pipe.

[0008] The connector is a connecting plate. At least one connecting plate is provided laterally on the inner wall of the inner bushing. The connecting plate is arranged laterally, and the expansion valve body is located at the end of the connecting plate.

[0009] The connector is a steel wire, which is arranged longitudinally. The upper end of the steel wire is connected to the lower end face of the water grate, and the expansion valve body is located at the lower end of the steel wire.

[0010] The inner wall of the inner liner is provided with an annular sealing groove.

[0011] The expansion valve body and the inner liner are coaxially arranged. The expansion valve body includes a spindle, a lower end cover, a sliding rod, a one-way return valve, and an air bag. The spindle has an air passage that runs through the axis. The upper end of the sliding rod is located inside the air passage and is slidably connected to the air passage. The lower end of the sliding rod has a lower end cover that is coaxially arranged. An air bag is sleeved on the outside of the spindle. The upper end of the air bag is fixed to the upper end of the spindle by an upper pressure ring. The side of the upper pressure ring is connected to a connector. The lower end of the air bag is fixed to the lower end cover by a lower pressure ring. A one-way return valve is provided on the side of the spindle. The air inlet of the one-way return valve is connected to the air bag, and the air outlet of the one-way return valve is connected to the air passage.

[0012] The upper end of the air passage is equipped with a constant pressure explosion-proof valve, the upper end of which is connected to the air guide tube, and the lower end of which is threadedly connected to the upper end of the air passage.

[0013] The lower end of the airway has a protrusion on its inner wall. The upper end of the sliding rod passes through the protrusion of the airway. The upper end of the sliding rod has a limiting block. The lower end of the limiting block abuts against the upper surface of the protrusion of the airway.

[0014] The airbag has a coaxially arranged sealing ring on its side, and the sealing ring is configured to cooperate with the sealing groove.

[0015] The pneumatic sealing device for bridge deck drainage holes described in this utility model is highly practical and very convenient to use. It seals and drains water from the bridge deck drainage holes by expanding and contracting the air bladder on the side of the expansion valve body, effectively preventing hazardous chemicals from entering the water body. The sliding rod extends the air bladder during inflation, increasing the contact area between the air bladder and the drainage hole, and facilitates air bladder contraction during retraction, making it easier to separate the air bladder from the drainage hole and reducing the air bladder's volume. The sealing ring and sealing groove, which are designed in conjunction, provide secondary sealing of the drainage holes, improving the sealing effect. Attached Figure Description

[0016] Figure 1 This is a schematic diagram showing the positional relationship between the inner liner, the expansion valve body, and the bridge surface of this utility model.

[0017] Figure 2 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 3 This is a cross-sectional view of the inner liner of this utility model;

[0019] Figure 4 This is a cross-sectional view of the inner liner of this utility model;

[0020] Figure 5 This is a three-dimensional structural diagram of the expansion valve body of this utility model;

[0021] Figure 6This is a cross-sectional view of the expansion valve body of this utility model;

[0022] In the diagram: 1. Bridge deck; 2. Guardrail; 3. Drain hole; 4. Inner liner; 5. Expansion valve body; 6. Water grate; 7. Air duct; 8. Sealing groove; 9. Connecting plate; 10. Steel wire; 11. Constant pressure explosion-proof valve; 12. Airbag; 13. Upper pressure ring; 14. Lower pressure ring; 15. Sealing ring; 16. Mandrel; 17. Air passage; 18. Sliding rod; 19. Limiting block; 20. Lower end cover; 21. One-way return air valve. Detailed Implementation

[0023] The present invention will be explained in detail through the following embodiments. The purpose of disclosing the present invention is to protect all technical improvements within the scope of the present invention.

[0024] Combined with appendix Figures 1-6 A pneumatic sealing device for drainage holes on a bridge deck includes an inner sleeve 4 and an expansion valve body 5. The expansion valve body 5 is installed inside the inner sleeve 4. The inner sleeve 4 is installed in each drainage hole 3 on the side of the bridge deck 1 near the guardrail 2. The side of the inner sleeve 4 is connected to the inner wall of the drainage hole 3. A connector is provided inside the inner sleeve 4. The expansion valve body 5 is installed on the connector. An air guide pipe 7 is provided at the upper end of the expansion valve body 5. The air guide pipe 7 is connected to a compressed air source provided on the bridge deck 1.

[0025] The inner liner 4 has a water grate 6 at its upper opening, and the air guide pipe 7 passes through the water grate 6. The air outlet of the air guide pipe 7 is connected to the expansion valve body 5, and the air inlet of the air guide pipe 7 is connected to the compressed air source. The air guide pipe 7 is equipped with a vent valve.

[0026] The connector is a connecting plate 9. At least one connecting plate 9 is provided laterally on the inner wall of the inner bushing 4. The connecting plate 9 is arranged laterally, and the expansion valve body 5 is located at the end of the connecting plate 9.

[0027] The connecting component is a steel wire 10, which is arranged longitudinally. The upper end of the steel wire 10 is connected to the lower end face of the water grate 6, and the expansion valve body 5 is located at the lower end of the steel wire 10.

[0028] The inner wall of the inner liner 4 is provided with an annular sealing groove 8, the sealing groove 8 is arranged parallel to the connecting plate 9, and the connecting plate 9 is arranged above the sealing groove 8.

[0029] The expansion valve body 5 and the inner liner 4 are coaxially arranged. The expansion valve body 5 includes a spindle 16, a lower end cover 20, a sliding rod 18, a one-way return valve 21, and an air bag 12. The spindle 16 is provided with an air passage 17 that passes through the axis. The upper end of the sliding rod 18 is located in the air passage 17 and is slidably connected to the air passage 17. The lower end of the sliding rod 18 is provided with a lower end cover 20 that is coaxially arranged. The spindle 16 is covered with an air bag 12. The upper end of the air bag 12 is fixed to the upper end of the spindle 16 by an upper pressure ring 13. The side of the upper pressure ring 13 is connected to a connector. The lower end of the air bag 12 is fixed to the lower end cover 20 by a lower pressure ring 14. The side of the spindle 16 is provided with a one-way return valve 21. The air inlet of the one-way return valve 21 is connected to the air bag 12, and the air outlet of the one-way return valve 21 is connected to the air passage 17.

[0030] The upper end of the air passage 17 is provided with a constant pressure explosion-proof valve 11. The upper end of the constant pressure explosion-proof valve 11 is connected to the air guide pipe 7, and the lower end of the constant pressure explosion-proof valve 11 is threadedly connected to the upper end of the air passage 17. Compressed gas enters the air passage 17 through the constant pressure explosion-proof valve 11. The constant pressure explosion-proof valve 11 prevents too much gas from entering the air bag 12, avoiding the problem of irreversible plastic deformation or even rupture of the air bag 12 due to excessive air pressure, improving the reliability of the expansion valve body 5 and ensuring that the expansion valve body 5 can be reused.

[0031] The lower end of the air passage 17 has a protrusion on its inner wall. The upper end of the sliding rod 18 passes through the protrusion of the air passage 17. The upper end of the sliding rod 18 has a limiting block 19. The lower end of the limiting block 19 abuts against the upper surface of the protrusion of the air passage 17.

[0032] The airbag 12 is provided with a sealing ring 15 coaxially arranged on its side. The sealing ring 15 is configured to cooperate with the sealing groove 8. The sealing ring 15 is stuck in the sealing groove 8, which increases the stability of the airbag 12 after expansion and provides secondary sealing for the drain hole 3, thereby improving the sealing effect.

[0033] The pneumatic sealing device for bridge deck drainage holes described in Embodiment 1 involves fixing the expansion valve body 5 to the end of the connecting plate 9 of the inner bushing 4 during installation, and then installing the inner bushing 4 inside the drainage hole 3. In use, if a hazardous chemical tilt occurs, the compressed air source on the bridge deck 1 is remotely controlled to open, and compressed air is supplied to the air passage 17 inside the spindle 16 through the air guide pipe 7. At this time, the compressed gas enters the airbag 12 through the air passage 17 inside the spindle 16, and the airbag 12 begins to expand radially. Simultaneously, the lower end cover 20 moves downward according to the axial expansion of the airbag 12, causing the lower end cover 20 to drive the sliding rod 18 to slide downward within the air passage 17 until the limiting block 19 on the sliding rod 18 contacts the boss at the lower end of the air passage 17, cutting off the air passage 17 and the airbag 12's air intake channel. At this point, the airbag 12... When inflated to its maximum extent, the surface of the airbag 12 tightly adheres to the inner wall of the inner liner 4, sealing the drainage channel. The sealing ring 15 is engaged in the sealing groove 8, increasing the stability of the airbag 12 after inflation and providing secondary sealing to the drain hole 3, thus improving the sealing effect. When the expansion valve body 5 contracts, the air supply to the air passage 17 stops. At this time, the air pressure in the air passage 17 inside the spindle 16 decreases, and the air pressure inside the airbag 12 is greater than that inside the air passage 17. The one-way return air valve 21 automatically opens, and the gas inside the airbag 12 is transported to the air passage 17 through the one-way return air valve 21. The compressed gas on the expansion valve body 5 and the air guide pipe 7 is discharged through the air release valve. At this time, the airbag 12 begins to automatically contract until it returns to its initial state. The drain hole 3 of the bridge deck 1 then reopens, and the bridge deck 1 resumes normal drainage.

[0034] In the second embodiment, a pneumatic sealing device for a bridge deck drainage hole is installed by placing an inner sleeve 4 inside the drainage hole 3, fixing the expansion valve body 5 to the lower end of the steel wire 10, and placing the water grate 6 at the upper inlet of the inner sleeve 4. During use, if a hazardous chemical tilt occurs, the compressed air source on the bridge deck 1 is remotely controlled to open, and compressed air is supplied to the air passage 17 inside the spindle 16 through the air guide pipe 7. At this time, the compressed gas enters the airbag 12 through the air passage 17 inside the spindle 16, and the airbag 12 begins to expand radially. Simultaneously, the lower end cover 20 moves downward according to the axial expansion of the airbag 12, causing the lower end cover 20 to drive the sliding rod 18 to slide downward within the air passage 17 until the limiting block 19 on the sliding rod 18 contacts the boss at the lower end of the air passage 17, cutting off the air intake between the air passage 17 and the airbag 12. At this point, the airbag 12 inflates to its maximum extent, and the surface of the airbag 12 tightly adheres to the inner wall of the inner liner 4, sealing the drainage channel. The sealing ring 15 is engaged in the sealing groove 8, increasing the stability of the airbag 12 after inflation and providing secondary sealing to the drain hole 3, thus improving the sealing effect. When the expansion valve body 5 contracts, the air supply to the air passage 17 stops. At this time, the air pressure in the air passage 17 inside the spindle 16 decreases, and the air pressure inside the airbag 12 is greater than the air pressure in the air passage 17. The one-way return air valve 21 automatically opens, and the airbag 12 is transported to the air passage 17 through the one-way return air valve 21. The compressed gas on the expansion valve body 5 and the air guide pipe 7 is discharged through the air release valve. At this time, the airbag 12 begins to automatically contract until it returns to its initial state. The drain hole 3 of the bridge deck 1 then reopens, and the bridge deck 1 resumes normal drainage.

[0035] The parts of this utility model not described in detail are prior art. Although this utility model has been specifically shown and introduced in conjunction with preferred embodiments, there are many methods and approaches to implement this technical solution. The above description is only a preferred embodiment of this utility model. However, those skilled in the art should understand that various changes in form and detail can be made to this utility model without departing from the spirit and scope of this utility model as defined by the appended claims, and all such changes shall be within the protection scope of this utility model.

Claims

1. A pneumatic sealing device for drainage holes on a bridge deck, comprising an inner sleeve (4) and an expansion valve body (5), wherein the expansion valve body (5) is disposed inside the inner sleeve (4), the inner sleeve (4) is installed inside each drainage hole (3) on the side of the bridge deck (1) near the guardrail (2), and the side of the inner sleeve (4) is connected to the inner wall of the drainage hole (3), characterized in that: The inner liner (4) is provided with a connector, the expansion valve body (5) is installed on the connector, and the upper end of the expansion valve body (5) is provided with an air guide pipe (7), which is connected to the compressed air source provided on the bridge deck (1).

2. The pneumatic sealing device for bridge deck drainage holes according to claim 1, characterized in that: The inner liner (4) has a water grate (6) at the upper opening, and the air guide pipe (7) passes through the water grate (6). The air guide pipe (7) is equipped with an air release valve.

3. The aerodynamic deck drain plugging device of claim 1, wherein: The connector is a connecting plate (9). At least one connecting plate (9) is provided laterally on the inner wall of the inner bushing (4). The connecting plate (9) is arranged laterally, and the expansion valve body (5) is located at the end of the connecting plate (9).

4. The aerodynamic deck drain plugging device of claim 1, wherein: The connector is a steel wire (10), which is arranged longitudinally. The upper end of the steel wire (10) is connected to the lower end face of the water grate (6), and the expansion valve body (5) is located at the lower end of the steel wire (10).

5. The bridge deck drain pneumatic plug of claim 2, wherein: The inner wall of the inner liner (4) is provided with an annular sealing groove (8).

6. The aerodynamic deck drain plugging device of claim 1, wherein: The expansion valve body (5) and the inner liner (4) are coaxially arranged. The expansion valve body (5) includes a spindle (16), a lower end cover (20), a sliding rod (18), a one-way return valve (21), and an air bladder (12). The spindle (16) is provided with an air passage (17) that runs through the axis. The upper end of the sliding rod (18) is located in the air passage (17) and is slidably connected to the air passage (17). The lower end of the sliding rod (18) is provided with a lower end cover (20) that is coaxially arranged. 16) An airbag (12) is fitted on the outside. The upper end of the airbag (12) is fixed to the upper end of the spindle (16) by an upper pressure ring (13). The side of the upper pressure ring (13) is connected to the connector. The lower end of the airbag (12) is fixed to the lower end cover (20) by a lower pressure ring (14). A one-way return valve (21) is provided on the side of the spindle (16). The air inlet of the one-way return valve (21) is connected to the airbag (12), and the air outlet of the one-way return valve (21) is connected to the air passage (17).

7. The aerodynamic deck drain plugging device of claim 6, wherein: The upper end of the air passage (17) is provided with a constant pressure explosion-proof valve (11), the upper end of the constant pressure explosion-proof valve (11) is connected to the air guide pipe (7), and the lower end of the constant pressure explosion-proof valve (11) is threadedly connected to the upper end of the air passage (17).

8. The bridge deck drain pneumatic plug device of claim 7, wherein: The lower end of the air passage (17) has a boss on its inner wall. The upper end of the sliding rod (18) passes through the boss of the air passage (17). The upper end of the sliding rod (18) has a limiting block (19). The lower end of the limiting block (19) abuts against the upper surface of the boss of the air passage (17).

9. The bridge deck drain pneumatic plug apparatus of claim 6, wherein: The airbag (12) has a sealing ring (15) arranged coaxially on its side, and the sealing ring (15) is configured to cooperate with the sealing groove (8).

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