A sealing device for leak-proof concrete building formwork and its installation method

Abstract

This invention discloses a sealing device and installation method for anti-leakage concrete building formwork, belonging to the field of concrete building technology. It includes two vertical plates located between two horizontal plates, with two concave clamping rods fixedly installed on the opposite sides of each vertical plate, the two clamping rods engaging with the corresponding horizontal plates. An adsorption and fixing mechanism includes two positioning plates slidably installed on one side of the vertical plates, with multiple fixing cylinders mounted on the positioning plates. A piston plate is driven by a lead screw in a top-pressure tensioning mechanism, and pressure is transmitted within the sealed space to push the pressure plate, top rod, push plate, and hinge rod in tandem, thereby causing the suction cups on both sides to tighten synchronously inward, achieving active pulling of the horizontal plates. This structure abandons the traditional bolt-and-rod adjustment method, applying continuous top pressure after adsorption and fixing without external tools, and can tighten in real time according to the actual outward expansion trend of the horizontal plates, significantly improving the anti-expansion capacity of the formwork system.

Description

Technical Field

[0001] This invention belongs to the field of concrete building technology, specifically, it relates to a sealing device for concrete building formwork to prevent grout leakage and its installation method. Background Technology

[0002] In the context of green building development, the construction quality and resource utilization efficiency of concrete structures are receiving increasing attention. As a key piece of equipment in concrete pouring and forming, the sealing performance of formwork directly affects the quality of concrete forming, material waste, and formwork turnover rate. Currently, concrete formwork commonly uses spliced ​​wooden, aluminum alloy, or steel formwork, with the connections between horizontal and vertical panels often relying on mechanical clamping, rubber strips, or sealing tape for sealing. However, during actual construction, due to dynamic loads generated by concrete vibration, formwork deformation under stress, and insufficient splicing precision, gaps easily appear at the connections between horizontal and vertical panels, leading to cement grout leakage (commonly known as "grout leakage"). Grout leakage not only directly wastes concrete materials and increases construction waste, but also contaminates the formwork surface, reduces the number of times the formwork can be reused, and can even cause quality defects such as honeycomb and pitting on the surface of concrete components, affecting structural durability.

[0003] In existing technologies, some formwork sealing devices reinforce the horizontal and vertical plates using bolts, wedge-shaped locking elements, or magnetic adsorption. However, these methods generally suffer from the following problems: First, the sealing effect is passive. The sealing element initially adheres to and presses against the connecting surface. Once the horizontal plate expands or deforms due to concrete expansion or vibration, the tightness of the seal between the sealing element and the formwork decreases, weakening the sealing effect and making active compensation difficult. Second, the adsorption and fixing structure and the sealing structure are independent, lacking a linkage mechanism, and cannot simultaneously increase the sealing pressure when the horizontal plate expands outward. Third, traditional sealing methods require high installation precision of the formwork, involve cumbersome on-site adjustments, and the sealing strips or tapes are prone to aging and failure after repeated disassembly and assembly, requiring frequent replacements, which is detrimental to the material conservation and construction efficiency requirements of green building. To address the aforementioned issues, this application proposes a sealing device for leak-proof concrete building formwork and its installation method. Summary of the Invention

[0004] In view of the problems in related technologies, the present invention proposes a sealing device for anti-leakage concrete building formwork and its installation method to overcome the above-mentioned technical problems existing in the existing related technologies.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A sealing device for concrete building formwork to prevent grout leakage includes two vertical plates located between two horizontal plates. Two concave clamps are fixedly installed on the opposite side of each of the two vertical plates, and the two concave clamps are engaged with the corresponding horizontal plates. The adsorption and fixing mechanism includes two positioning plates, which are slidably installed on one side of the vertical plate. Multiple fixing cylinders are installed on the positioning plates, and suction cups are installed on the side of the fixing cylinders away from the positioning plates. The suction cups contact and cooperate with the corresponding horizontal plates. The top-pressure tensioning mechanism includes a pressure box, which is fixedly installed on one side of a vertical plate, and a top rod is slidably connected to the bottom of the pressure box. A push plate is fixedly installed at the bottom end of the top rod, and the push plate is connected to two positioning plates in a transmission manner. The active compensation sealing mechanism includes two storage slots, which are fixedly installed on the front and rear sides of the vertical plate, respectively. Sealing airbags are installed on the inner walls of the storage slots, and the sealing airbags contact and cooperate with the corresponding horizontal plates.

[0006] Preferably, the adsorption and fixing mechanism further includes two shrink plates, and two screws are rotatably connected to the two positioning plates on the same side that are close to each other. The shrink plates are threadedly connected to the corresponding two screws, and multiple pull rods are fixedly installed on one side of the shrink plates. A piston block is slidably connected to the inner wall of the fixing cylinder, and the piston block is fixedly connected to the corresponding pull rod.

[0007] Preferably, two positioning seats are fixedly installed on one side of the vertical plate, and a shrink cylinder is rotatably connected between the two positioning seats. The two ends of the shrink cylinder are slidably connected to two screws, and an extrusion block is fixedly installed at the end of each screw that is close to the other. The extrusion block is fitted against the inner wall of the shrink cylinder.

[0008] Preferably, two limiting blocks are fixedly installed at both ends of the shrink cylinder, and two symmetrically arranged limiting grooves are opened on the screw, with the limiting blocks slidingly connected to the corresponding limiting grooves.

[0009] Preferably, the top-pressure tensioning mechanism further includes a pressure plate and a piston plate. The piston plate and the pressure plate are slidably attached to the inner wall of the injection box, and the pressure plate is fixedly connected to the top rod. A rotating plate is rotatably connected to the top of the injection box, and a lead screw is slidably connected to the top of the injection box. The lead screw is fixedly connected to the piston plate, and the rotating plate is threadedly connected to the lead screw.

[0010] Preferably, the top of the push plate is rotatably connected to two hinge rods, and the same moving plate is rotatably connected to two screws on the same side. The hinge rods are rotatably connected to the corresponding moving plates.

[0011] Preferably, the active compensation sealing mechanism further includes an annular connecting box, with an annular connecting box rotatably connected to both ends of the shrink cylinder, and a conduit connected to the annular connecting box, one end of which is in communication with the corresponding sealing airbag.

[0012] Preferably, both ends of the shrink cylinder are provided with connection holes, which are interconnected with the corresponding annular connection boxes and cooperate with the corresponding extrusion blocks.

[0013] Preferably, two rubber sealing strips are installed on one side of the storage groove, and the rubber sealing strips are located on both sides of the sealing airbag.

[0014] A method for using a sealing device for concrete formwork to prevent grout leakage includes the following steps: S1: The suction cups on both sides of the vertical plate are set to contact the horizontal plate. The two rotating shrinking cylinders are slidably connected to the limiting block and the limiting groove, which drives the screw to rotate. The screw is connected to the shrinking plate by a thread, which drives multiple pull rods to move simultaneously. The pull rods drive the piston block to move in the fixed cylinder, which makes the suction cups form a vacuum state, so that they can be stably adsorbed on the horizontal plate. At the same time, the two squeezing blocks in the shrinking cylinder can squeeze the air at the end of the shrinking cylinder and discharge it when the screw and the shrinking cylinder are relatively displaced, which makes the suction cups negative pressure and adsorbed on the corresponding horizontal plate, forming the corresponding fixing effect. S2: Rotate the rotating plate. The rotating plate is connected to the lead screw by a thread and is also connected to the injection box by a rotation. This allows the lead screw to move. The lead screw presses the piston plate downward and pushes the pressure plate downward through the internal space of the injection box. The pressure plate pushes the push rod to move. The push rod pushes the push plate. The push plate moves the two moving plates closer to each other through two hinged rods. This allows the screw to move the suction cup on the positioning plate inward, thereby pulling and tightening the horizontal plate to prevent leakage due to expansion at the connection between the horizontal and vertical plates. S3: When the two horizontal plates expand slightly outward due to concrete pouring or vibration, the horizontal plates are pulled relative to each other by the suction cups and the screw. The screw drives the extrusion block to move inside the shrinkage cylinder. The air in both ends of the shrinkage cylinder is introduced into the annular connecting box through the connecting hole under the action of the extrusion block, and then injected into the sealing airbag through the conduit, thereby increasing the air pressure in the sealing airbag. This increases the fit between the sealing airbag and the horizontal plate, thus forming a tight seal when the horizontal and vertical plates expand.

[0015] In summary, the technical effects and advantages of this invention are as follows: 1. Dual-mode synergistic adsorption and immobilization system This solution combines a suction cup-type adsorption and fixing mechanism with the lateral blocking effect of a concave clamp rod, forming a dual positioning mechanism of "lateral blocking + vertical adsorption". The concave clamp rod provides lateral blocking and limiting simultaneously when the suction cup contacts the horizontal plate, effectively preventing the suction cup from shifting during the negative pressure formation process, ensuring that the suction cup is accurately positioned and achieves efficient adsorption, and greatly improving the stability in the initial stage of template splicing.

[0016] 2. Negative pressure vacuum-based stable adsorption mechanism The screw is rotated by the shrinking cylinder, which in turn drives multiple sets of tie rods and piston blocks to move within the fixed cylinder, creating a negative pressure vacuum inside the suction cup. This structure allows the suction cup to be stably attached to the surface of the horizontal plate, providing a continuous suction and fixation effect during concrete pouring and vibration, significantly enhancing the connection strength between the vertical and horizontal plates, and preventing structural failure due to loose connections.

[0017] 3. Mechanical top-pressure tensioning linkage mechanism The top-pressure tensioning mechanism uses a screw-driven piston plate, which transmits pressure within a sealed space to drive the pressure plate, top rod, push plate, and hinge rod in tandem. This causes the suction cups on both sides to tighten synchronously inward, achieving active pulling of the horizontal plate. This structure abandons the traditional bolt-and-rod adjustment method, applying continuous top pressure after adsorption and fixation without external tools. It can tighten in real time according to the actual outward expansion trend of the horizontal plate, significantly improving the anti-expansion capability of the template system.

[0018] 4. Active pressure compensation sealing mechanism The air pressure source of the sealing airbag is linked to the contraction action of the adsorption mechanism. When the horizontal plate slightly expands outward due to concrete pouring or vibration, the suction cup drives the screw to produce relative displacement. The extrusion block at the end of the screw moves inside the contraction cylinder, compressing the air at both ends of the cylinder and delivering it to the interior of the sealing airbag through the annular connecting box and conduit. This causes the air pressure in the airbag to automatically increase with the degree of outward expansion. As a result, the fit between the sealing airbag and the horizontal plate increases synchronously with the outward expansion, achieving an active compensation sealing effect of "the greater the outward expansion, the tighter the seal." This fundamentally solves the problem of traditional seals losing their tightness due to the expansion of the horizontal plate.

[0019] 5. Multiple fixing and double sealing protection structure The rubber sealing strips on both sides of the airbag form a double seal with the airbag body, simultaneously improving the grout leakage prevention performance at the connection between the vertical and horizontal plates. At the same time, the synergistic effect of the adsorption fixing mechanism and the tensioning mechanism ensures that the horizontal plate is positioned and constrained in multiple directions. The rigidity and integrity of the entire formwork system are significantly improved throughout the concrete pouring process, effectively preventing grout leakage caused by deformation at the connection. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a side view of the vertical plate structure of the present invention; Figure 3 This is a schematic diagram of the adsorption and fixation mechanism of the present invention; Figure 4 This is a schematic diagram of the active compensation sealing mechanism of the present invention; Figure 5This is a schematic diagram of the top-pressure tensioning mechanism of the present invention; Figure 6 This is a schematic cross-sectional view of the shrink tube structure of the present invention; Figure 7 This is a cross-sectional view of the fixing cylinder and suction cup of the present invention.

[0021] In the picture: 1. Horizontal plate; 2. Vertical plate; 3. Concave clamping rod; 4. Adsorption fixing mechanism; 41. Positioning plate; 42. Fixing cylinder; 43. Suction cup; 44. Pull rod; 45. Piston block; 46. Shrink plate; 47. Screw; 48. Positioning seat; 49. Shrink cylinder; 5. Top-pressure tensioning mechanism; 51. Injection box; 52. Piston plate; 53. Screw; 54. Rotating plate; 55. Pressure plate; 56. Top rod; 57. Push plate; 58. Hinge rod; 59. Moving plate; 6. Active compensation sealing mechanism; 61. Storage groove; 62. Rubber sealing strip; 63. Sealing airbag; 64. Conduit; 65. Annular connecting box; 66. Connecting hole; 7. Extrusion block; 8. Limiting groove; 9. Limiting block. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] Reference Figure 1-7 A sealing device for concrete building formwork to prevent leakage of grout includes two vertical plates 2 located between two horizontal plates 1. Two concave clamp rods 3 are fixedly installed on the side of each of the two vertical plates 2 that are far apart from each other. The two concave clamp rods 3 are engaged with the corresponding horizontal plates 1. The concave clamp rods 3 can form a lateral blocking effect when the suction cup 43 contacts the horizontal plate 1. The adsorption and fixing mechanism 4 includes two positioning plates 41, which are slidably installed on one side of the vertical plate 2. Multiple fixing cylinders 42 are installed on the positioning plates 41. A suction cup 43 is installed on the side of the fixing cylinder 42 away from the positioning plate 41, and the suction cup 43 contacts and cooperates with the corresponding horizontal plate 1. The top-pressure tensioning mechanism 5 includes a pressure box 51, which is fixedly installed on one side of the vertical plate 2. A top rod 56 is slidably connected to the bottom of the pressure box 51. A push plate 57 is fixedly installed at the bottom end of the top rod 56. The push plate 57 is connected to two positioning plates 41 in a transmission manner. The active compensation sealing mechanism 6 includes two storage slots 61, which are fixedly installed on the front and rear sides of the vertical plate 2 respectively. A sealing airbag 63 is installed on the inner wall of the storage slot 61, and the sealing airbag 63 contacts and cooperates with the corresponding horizontal plate 1.

[0024] Reference Figure 1 and Figure 4 The adsorption and fixing mechanism 4 also includes two shrink plates 46. Two screws 47 are rotatably connected to the two positioning plates 41 on the same side, with the latter two being close to each other. The shrink plates 46 are threadedly connected to the corresponding screws 47, and multiple pull rods 44 are fixedly installed on one side of the shrink plates 46. A piston block 45 is slidably connected to the inner wall of the fixing cylinder 42, and the piston block 45 is fixedly connected to the corresponding pull rod 44. Two positioning seats 48 are fixedly installed on one side of the vertical plate 2, and a shrink cylinder 49 is rotatably connected between the two positioning seats 48. Both ends of the shrink cylinder 49 are slidably connected to the two screws 47, and a pressing block 7 is fixedly installed at the end of each screw 47 that is close to each other. The pressing block 7 is fitted against the inner wall of the shrink cylinder 49. Two limiting blocks 9 are fixedly installed at each end opening. Two symmetrically arranged limiting grooves 8 are opened on the screw 47. The limiting blocks 9 are slidably connected to the corresponding limiting grooves 8. The two rotating shrinking cylinders 49 are slidably connected to the limiting blocks 9 and the limiting grooves 8, thereby driving the screw 47 to rotate. The screw 47 is threadedly connected to the shrinking plate 46, thereby driving multiple pull rods 44 to move simultaneously. The pull rods 44 drive the piston block 45 to move inside the fixed cylinder 42, thereby enabling the suction cup 43 to form a vacuum state, thus stably adsorbing onto the horizontal plate 1. At the same time, the setting of two squeezing blocks 7 inside the shrinking cylinder 49 can squeeze and discharge the air at the end of the shrinking cylinder 49 when the screw 47 and the shrinking cylinder 49 are relatively displaced.

[0025] Reference Figure 4 The top-pressure tensioning mechanism 5 also includes a pressure plate 55 and a piston plate 52. Both the piston plate 52 and the pressure plate 55 are slidably attached to the inner wall of the injection box 51, and the pressure plate 55 is fixedly connected to the top rod 56. A rotating plate 54 is rotatably connected to the top of the injection box 51, and a lead screw 53 is slidably connected to the top of the injection box 51. The lead screw 53 is fixedly connected to the piston plate 52, and the rotating plate 54 is threadedly connected to the lead screw 53. Two hinge rods 58 are rotatably connected to the top of the push plate 57. The same moving plate 59 is rotatably connected to the two screws 47 on the same side. The hinge rods 58 are rotatably connected to the corresponding moving plates 59. When it is necessary to retract the horizontal plates 1 on both sides inwards... When tightened, the rotating plate 54 is rotated. The rotating plate 54 is connected to the lead screw 53 by a thread and is also connected to the injection box 51 by rotation. This allows the lead screw 53 to move. The lead screw 53 presses the piston plate 52 downward and pushes the pressure plate 55 downward through the internal space of the injection box 51. The pressure plate 55 pushes the push rod 56 to move. The push rod 56 pushes the push plate 57. The push plate 57 drives the two moving plates 59 to move closer to each other through the two hinge rods 58. This allows the suction cup 43 on the positioning plate 41 to move inward through the screw 47, thereby pulling and tightening the horizontal plate 1 to prevent leakage due to expansion at the connection between the horizontal plate 1 and the vertical plate 2.

[0026] Reference Figure 2The active compensation sealing mechanism 6 also includes an annular connecting box 65. Both ends of the shrink cylinder 49 are rotatably connected to the annular connecting box 65. A conduit 64 is connected to the annular connecting box 65. One end of the conduit 64 is connected to the corresponding sealing airbag 63. Both ends of the shrink cylinder 49 are provided with connecting holes 66. The connecting holes 66 are connected to the corresponding annular connecting box 65, and the connecting holes 66 cooperate with the corresponding extrusion block 7. The air in both ends of the shrink cylinder 49 is introduced into the annular connecting box 65 through the connecting holes 66 under the action of the extrusion block 7, and then injected into the sealing airbag 63 through the conduit 64, thereby increasing the air pressure in the sealing airbag 63. This increases the degree of contact between the sealing airbag 63 and the horizontal plate 1, thus forming a tight seal when expansion occurs between the horizontal plate 1 and the vertical plate 2.

[0027] Reference Figure 2 Two rubber sealing strips 62 are installed on one side of the storage slot 61. The rubber sealing strips 62 are located on both sides of the sealing airbag 63. The setting of the rubber sealing strips 62 can increase the sealing effect between the vertical plate 2 and the horizontal plate 1, forming a double sealing guarantee.

[0028] A method for using a sealing device for concrete formwork to prevent grout leakage includes the following steps: S1: The suction cups 43 on both sides of the vertical plate 2 are set to contact the horizontal plate 1. The two shrinking cylinders 49 that rotate at the same time are slidably connected to the limiting groove 8 through the limiting block 9, which can drive the screw 47 to rotate. The screw 47 is threadedly connected to the shrinking plate 46, which can drive multiple pull rods 44 to move at the same time. The pull rods 44 drive the piston block 45 to move in the fixed cylinder 42, which can make the suction cup 43 form a vacuum state, and thus stably adhere to the horizontal plate 1. At the same time, the two squeezing blocks 7 in the shrinking cylinder 49 can squeeze the air at the end of the shrinking cylinder 49 and discharge it when the screw 47 and the shrinking cylinder 49 are relatively displaced, which can create negative pressure inside the suction cup 43 and adhere to the corresponding horizontal plate 1 to form the corresponding fixing effect. S2: Rotate the rotating plate 54. The rotating plate 54 is connected to the lead screw 53 by a thread and is also connected to the injection box 51 by rotation. This allows the lead screw 53 to move. The lead screw 53 presses the piston plate 52 downward and pushes the pressure plate 55 downward through the internal space of the injection box 51. The pressure plate 55 pushes the push rod 56 to move. The push rod 56 pushes the push plate 57. The push plate 57 drives the two moving plates 59 to move closer to each other through two hinge rods 58. This allows the suction cup 43 on the positioning plate 41 to move inward through the screw 47, thereby pulling and tightening the horizontal plate 1 to prevent leakage at the connection between the horizontal plate 1 and the vertical plate 2 due to expansion. S3: When the two horizontal plates 1 expand slightly outward due to concrete pouring or vibration, the horizontal plates 1 move relative to each other by pulling the screw 47 through the suction cup 43. The screw 47 drives the extrusion block 7 to move inside the shrinkage cylinder 49. The air in both ends of the shrinkage cylinder 49 is introduced into the annular connecting box 65 through the connecting hole 66 under the action of the extrusion block 7, and is injected into the sealing airbag 63 through the conduit 64, thereby increasing the air pressure in the sealing airbag 63, which increases the degree of fit between the sealing airbag 63 and the horizontal plate 1, and thus forms a tight sealing effect when the horizontal plate 1 and the vertical plate 2 expand.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sealing device for concrete building formwork to prevent grout leakage, comprising two vertical plates (2) located between two horizontal plates (1), characterized in that, Two concave clips (3) are fixedly installed on the side of each of the two vertical plates (2) that are far apart from each other, and the two concave clips (3) are engaged with the corresponding horizontal plates (1); The adsorption fixing mechanism (4) includes two positioning plates (41). The two positioning plates (41) are slidably installed on one side of the vertical plate (2). Multiple fixing cylinders (42) are installed on the positioning plates (41). A suction cup (43) is installed on the side of the fixing cylinder (42) away from the positioning plate (41). The suction cup (43) contacts and cooperates with the corresponding horizontal plate (1). The top-pressure tensioning mechanism (5) includes a pressure box (51), which is fixedly installed on one side of the vertical plate (2), and a top rod (56) is slidably connected to the bottom of the pressure box (51). A push plate (57) is fixedly installed at the bottom end of the top rod (56), and the push plate (57) is connected to two positioning plates (41) in a transmission manner. The active compensation sealing mechanism (6) includes two storage slots (61), which are fixedly installed on the front and rear sides of the vertical plate (2) respectively, and a sealing airbag (63) is installed on the inner wall of the storage slot (61), and the sealing airbag (63) is in contact with the corresponding horizontal plate (1).

2. The anti-leakage concrete building formwork sealing device according to claim 1, characterized in that, The adsorption fixing mechanism (4) also includes two shrink plates (46). Two screws (47) are rotatably connected to the side of the two positioning plates (41) on the same side that are close to each other. The shrink plates (46) are threadedly connected to the corresponding two screws (47). Multiple pull rods (44) are fixedly installed on one side of the shrink plates (46). A piston block (45) is slidably connected to the inner wall of the fixing cylinder (42). The piston block (45) is fixedly connected to the corresponding pull rod (44).

3. The anti-leakage concrete building formwork sealing device according to claim 2, characterized in that, Two positioning seats (48) are fixedly installed on one side of the vertical plate (2). A shrink cylinder (49) is rotatably connected between the two positioning seats (48). The two ends of the shrink cylinder (49) are slidably connected to two screws (47). An extrusion block (7) is fixedly installed at the end of the two screws (47) that are close to each other. The extrusion block (7) is fitted to the inner wall of the shrink cylinder (49).

4. The anti-leakage concrete building formwork sealing device according to claim 3, characterized in that, Two limiting blocks (9) are fixedly installed at both ends of the shrink cylinder (49), and two symmetrically arranged limiting grooves (8) are opened on the screw (47). The limiting blocks (9) are slidably connected to the corresponding limiting grooves (8).

5. A sealing device for leak-proof concrete building formwork according to claim 1, characterized in that, The top-pressure tensioning mechanism (5) also includes a pressure plate (55) and a piston plate (52). The piston plate (52) and the pressure plate (55) are slidably attached to the inner wall of the injection box (51). The pressure plate (55) is fixedly connected to the top rod (56). The top of the injection box (51) is rotatably connected to a rotating plate (54). The top of the injection box (51) is slidably connected to a lead screw (53). The lead screw (53) is fixedly connected to the piston plate (52). The rotating plate (54) is threadedly connected to the lead screw (53).

6. The anti-leakage concrete building formwork sealing device according to claim 1, characterized in that, The top of the push plate (57) is rotatably connected to two hinge rods (58), and the same moving plate (59) is rotatably connected to the two screws (47) on the same side. The hinge rods (58) are rotatably connected to the corresponding moving plate (59).

7. A sealing device for leak-proof concrete building formwork according to claim 1, characterized in that, The active compensation sealing mechanism (6) also includes an annular connecting box (65). Both ends of the shrink cylinder (49) are rotatably connected to the annular connecting box (65). A conduit (64) is connected to the annular connecting box (65). One end of the conduit (64) is connected to the corresponding sealing airbag (63).

8. A sealing device for leak-proof concrete building formwork according to claim 7, characterized in that, Both ends of the shrink cylinder (49) are provided with connection holes (66), the connection holes (66) are connected to the corresponding annular connection box (65), and the connection holes (66) are cooperated with the corresponding extrusion block (7).

9. A sealing device for leak-proof concrete building formwork according to claim 1, characterized in that, Two rubber sealing strips (62) are installed on one side of the storage slot (61), and the rubber sealing strips (62) are located on both sides of the sealing airbag (63).

10. The method of using a leak-proof concrete building formwork sealing device according to claims 1-9, characterized in that, Includes the following steps: S1: The suction cups (43) on both sides of the vertical plate (2) are set to contact the horizontal plate (1). The two shrinking cylinders (49) that rotate at the same time are connected to the limiting block (9) and the limiting groove (8) through sliding connection, which can drive the screw (47) to rotate. The screw (47) is connected to the shrinking plate (46) through thread, which can drive multiple pull rods (44) to move at the same time. The pull rods (44) drive the piston block (45) to move in the fixed cylinder (42), which can make the suction cup (43) form a vacuum state, and thus be stably adsorbed on the horizontal plate (1). At the same time, the setting of the two extrusion blocks (7) in the shrinking cylinder (49) can squeeze the air at the end of the shrinking cylinder (49) and discharge it when the screw (47) and the shrinking cylinder (49) are relatively displaced, which can make the suction cup (43) internally negative pressure and adsorb on the corresponding horizontal plate (1) to form a corresponding fixing effect. S2: Rotate the rotating plate (54). The rotating plate (54) is connected to the screw (53) by a thread and the rotating plate (54) is connected to the injection box (51) by rotation. This allows the screw (53) to move. The screw (53) presses the piston plate (52) downward and pushes the pressure plate (55) downward through the internal space of the injection box (51). The pressure plate (55) pushes the push rod (56) to move. The push rod (56) pushes the push plate (57). The push plate (57) drives the two moving plates (59) to move closer to each other through two hinge rods (58). This allows the screw (47) to drive the suction cup (43) on the positioning plate (41) to move inward. This pulls and tightens the horizontal plate (1) to prevent leakage at the connection between the horizontal plate (1) and the vertical plate (2) due to expansion. S3: When the two horizontal plates (1) expand slightly due to concrete pouring or vibration, the horizontal plates (1) are pulled by the suction cup (43) to move relative to the screw (47). The screw (47) drives the extrusion block (7) to move inside the shrink cylinder (49). The air in both ends of the shrink cylinder (49) is introduced into the annular connecting box (65) through the connecting hole (66) under the action of the extrusion block (7), and injected into the sealing airbag (63) through the conduit (64), thereby increasing the air pressure in the sealing airbag (63) and increasing the degree of fit between the sealing airbag (63) and the horizontal plate (1), so that a tight sealing effect can be formed when the horizontal plate (1) and the vertical plate (2) expand.

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