A construction method of a box girder and a blocking cover for a construction beam hole

Abstract

The present application relates to the field of bridge engineering, and particularly relates to a plugging cover for a construction anti-beam-falling hole and a construction method of a box-shaped beam. The plugging cover for the construction anti-beam-falling hole comprises a hole plug and a cover plate, the cover plate is connected to the top of the hole plug, the top of the cover plate is provided with a plane and an inclined plane, the included angle between the inclined plane and the plane is adapted to the included angle between the chamfer of the box-shaped beam and the bottom plate, the projection shape and size of the cover plate in the horizontal direction are adapted to the cross-sectional shape and size of the anti-beam-falling hole; the hole plug can be clamped with the upper sleeve in the anti-beam-falling hole; the cover plate is provided with an exhaust hole, the exhaust hole penetrates through the cover plate and the hole plug along the thickness direction of the cover plate. The plugging cover can form a temporary blocking structure on the top of the anti-beam-falling hole by plugging the upper sleeve, and after the plugging cover is removed, no concrete blocking area is formed, so that the limiting steel tenon and the limiting ring can be smoothly put into and installed from the top opening of the anti-beam-falling hole according to the normal process.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering, and in particular to a sealing cover for preventing beams from falling during construction and a construction method for box girders. Background Technology

[0002] Under extreme external forces such as earthquakes and impacts, bridge structures are highly susceptible to serious accidents such as beam collapse. Beam collapse manifests as a beam detaching from its original support position and falling, a situation posing extremely serious hazards. On one hand, it directly causes devastating damage to the overall bridge structure, leading to traffic disruption and severely impacting normal passage in the area; on the other hand, the falling beam may also damage various facilities below, posing a significant threat to the safety of passing personnel and vehicles, and subsequently triggering a series of serious secondary disasters. Moreover, after a beam collapse accident, bridge repair work faces enormous challenges, not only due to the difficulty of repair and the high costs, but also the often lengthy repair period.

[0003] like Figure 10 and Figure 11 As shown, the box girder 8 includes a bottom plate 801, a web plate 803, and a top plate 804, with a chamfer 802 between the bottom plate 801 and the web plate 803. To effectively reduce the risk of beam falling, the commonly used technical solution is to set an anti-falling beam hole on the bottom plate 801 of the box girder 8. This anti-falling beam hole penetrates the bottom plate 801 of the box girder 8, and an upper sleeve 9 and a lower sleeve 10 are installed on the hole wall. The bottom end of the upper sleeve 9 is fitted onto the outer wall of the top end of the lower sleeve 10, and a limiting steel tenon is inserted into the upper sleeve 9 and the lower sleeve 10. The bottom end of the limiting steel tenon is fixed in a reserved hole on the top of the pier, and a limiting ring is also provided between the limiting steel tenon and the upper sleeve 9. When installing the limiting steel tenon and the limiting ring, they must be inserted into the upper sleeve 9 through the top opening of the anti-falling beam hole.

[0004] However, the existing technology has significant drawbacks when the anti-falling beam hole is located at the intersection of the bottom plate 801 and the chamfer 802 of the box girder 8. In the existing technology, the upper end face of the upper sleeve 9 is kept parallel to the surface of the bottom plate 801, and the upper end face of the upper sleeve 9 is usually sealed with tape to prevent concrete from falling into the upper sleeve 9 during the pouring of the box girder 8. However, after demolding, due to the presence of the chamfer 802, a blocking area 8021 is formed at the top of the anti-falling beam hole, preventing the opening of the anti-falling beam hole from being fully exposed. This situation makes it impossible for the limiting tenon and the limiting ring to be smoothly inserted and installed from the top opening of the anti-falling beam hole according to the normal procedure. Summary of the Invention

[0005] The purpose of this invention is to overcome the limitations of existing technologies where, when the anti-fall beam hole is located at the intersection of the bottom plate and chamfer of a box girder, sealing the upper end face of the upper sleeve with adhesive tape results in an obstruction area at the top of the anti-fall beam hole after concrete pouring and formwork removal. This prevents the limiting tenon and limiting ring from being smoothly inserted and installed through the top opening of the anti-fall beam hole according to the normal procedure. Therefore, this invention provides a sealing cover for constructing anti-fall beam holes and a construction method for box girders.

[0006] In a first aspect, the present invention provides a sealing cover for a construction anti-fall beam hole, comprising a hole plug and a cover plate, the cover plate being connected to the top of the hole plug, the top of the cover plate having a plane and an inclined surface, the included angle between the inclined surface and the plane being adapted to the included angle between the chamfer and the bottom plate of the box girder, the projection shape and size of the cover plate in the horizontal direction being adapted to the cross-sectional shape and size of the anti-fall beam hole; the hole plug being capable of engaging with an upper sleeve in the anti-fall beam hole; the cover plate having a vent hole, the vent hole penetrating the cover plate and the hole plug along the thickness direction of the cover plate.

[0007] This invention provides a sealing cover for a beam-prevention hole during construction. The cover plate covers the upper end face of an upper sleeve, achieving basic sealing of the upper end of the upper sleeve. A bevel on the cover plate forms a protrusion, which pre-constructs a removable temporary blocking structure above the beam-prevention hole to prevent concrete from the chamfer of the box girder from entering this area. The angle between the top surface of the bevel and the flat surface matches the angle between the chamfer and the bottom plate of the box girder. The purpose of this design is to ensure that after the sealing cover is installed on the upper sleeve, the installation of the chamfer and the bottom plate template is not interfered with by the sealing cover, ensuring that the template can be installed according to the normal process and guaranteeing smooth construction. The cover plate's horizontal projection shape and size are adapted to the cross-sectional shape and size of the anti-fall beam hole. The purpose of this design is to ensure that the cover plate effectively blocks concrete above the anti-fall beam hole while minimizing damage to the integrity of the box girder's chamfer, avoiding unnecessary damage to the chamfer structure due to the sealing cover, and guaranteeing the structural quality of the box girder. The vent hole balances the air pressure outside the sealing cover and inside the upper sleeve, allowing for smoother installation and removal of the sealing cover.

[0008] This invention provides a sealing cap for a beam-prevention hole during construction. By sealing the upper sleeve with the cap, a temporary obstruction structure is formed at the top of the beam-prevention hole during concrete pouring, preventing concrete from the chamfered corner of the box girder from entering above the hole. After pouring, the cap ensures the top of the beam-prevention hole is formed. After removing the cap, no concrete obstruction area is formed, allowing the limiting tenon and limiting ring to be smoothly inserted and installed through the top opening of the beam-prevention hole according to normal procedures. Simultaneously, the cap also improves the forming quality of the top of the beam-prevention hole.

[0009] Preferably, it also includes an airbag located below the plug. The cover plate has a groove at the position of the plane, and an air nozzle is provided in the groove. The air nozzle communicates with the airbag, and the airbag can fill the inner cavity of the upper sleeve by inflation.

[0010] In this design, the groove accommodates the air nozzle, preventing it from protruding from the plane and thus affecting the installation of the template. The air nozzle serves as an interface for inflating and deflating the airbag, functioning similarly to a bicycle tire valve. After inflation, the airbag fits tightly against the inner wall of the upper sleeve, effectively sealing its cavity and preventing cement slurry from accidentally flowing into the upper sleeve during concrete pouring, thus avoiding blockage. During demolding, the airbag deflates, releasing the seal and facilitating the removal of the sealing cap.

[0011] Preferably, a staggered platform is provided on the side wall at the opening of the groove, and a groove cover is installed at the opening of the groove. The groove cover is supported on the staggered platform, and the top surface of the groove cover is flush with the plane. In this design, the staggered platform provides a support position for the groove cover. The main function of the groove cover is to protect the air nozzle inside the groove from dust contamination from the external environment or blockage by cement slurry during concrete pouring, thereby ensuring the normal operation of the air nozzle. The top surface of the groove cover is flush with the plane to prevent the groove cover from protruding from the plane and thus affecting the installation of the formwork.

[0012] Preferably, the surface of the airbag is provided with anti-slip texture. In this design, the anti-slip texture can increase the friction between the outer surface of the airbag and the inner wall of the upper sleeve, which can effectively prevent relative sliding between the airbag and the upper sleeve and improve the overall sealing effect.

[0013] Both the cover plate and the plug can be made of rubber, engineering plastics, or aluminum alloy.

[0014] Preferably, the cover plate and the plug are integrally molded, and both are made of rubber. This integral molding process effectively ensures the overall structural integrity of the sealing cap, avoiding problems such as weak connections and poor sealing caused by component splicing. Compared to engineering plastics and aluminum alloys, rubber is softer and possesses excellent toughness and good deformation capacity. During the mold removal stage, this characteristic allows the sealing cap to more easily undergo elastic deformation under external force, thus smoothly detaching from the installation position, facilitating disassembly and effectively improving production efficiency.

[0015] Preferably, the thickness of the planar area on the cover plate is 3mm-10mm.

[0016] Preferably, the thickness of the plug is 20mm-40mm.

[0017] Preferably, the top of the cover plate is provided with a lifting ring, which can be embedded in the cover plate. In this design, the lifting ring is designed to facilitate quick and easy removal of the sealing cover by using it as a force point. The lifting ring can be positioned on the flat surface or the inclined surface. The inclusion of the lifting ring in the cover plate is to prevent it from protruding from the flat surface or the inclined surface, thus avoiding interference with the installation of the template.

[0018] In a second aspect, the present invention provides a construction method for a box girder, employing a sealing cap for preventing beam fall during construction as described in the first aspect, comprising the following steps: S1: Tie the reinforcing bars of the box girder and install the upper sleeve to the position of the anti-falling beam hole, which is located at the intersection of the bottom plate and the chamfer of the box girder; S2: Install the sealing cap to the top of the upper sleeve, insert the plug of the sealing cap into the upper sleeve, keep the plane of the sealing cap flush with the finished surface of the base plate, and keep the bevel of the sealing cap flush with the finished surface of the chamfer. S3: Carry out formwork construction and pour concrete; S4: After the concrete reaches the demolding strength, remove the formwork and the sealing cover to complete the construction of the anti-fall beam hole.

[0019] This invention provides a construction method for a box girder. The upper sleeve is used to form the anti-fall-beam hole, and the sealing cap is used to seal the top opening of the upper sleeve and temporarily occupy the upper area of ​​the anti-fall-beam hole. By sealing the top of the upper sleeve with the sealing cap, a concrete obstruction area is prevented from forming at the top of the formed anti-fall-beam hole, allowing the limiting tenon and limiting ring to be smoothly inserted and installed through the top opening of the anti-fall-beam hole according to the normal procedure.

[0020] Preferably, when the sealing cap includes an airbag and an air nozzle, step S2 further includes: inflating the airbag through the air nozzle to expand the airbag volume and seal the inner cavity of the upper sleeve; step S4 further includes: before removing the sealing cap, deflating the airbag through the air nozzle to shrink the airbag volume and separate it from the inner wall of the upper sleeve.

[0021] In this design, the airbag expands upon inflation, tightly fitting the inner wall of the upper sleeve and effectively sealing its cavity. This prevents cement slurry from accidentally flowing into the upper sleeve's cavity during concrete pouring, thus avoiding blockage. During demolding, the airbag deflates and collapses, releasing the seal and facilitating the removal of the sealing cap.

[0022] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention provides a sealing cap for a beam-prevention hole during construction. By sealing the upper sleeve with the cap, a temporary blocking structure is formed at the top of the beam-prevention hole during concrete pouring, preventing concrete from the chamfered corner of the box girder from entering above the hole. After pouring, the cap allows the top of the beam-prevention hole to be formed. After removing the cap, no concrete obstruction area is formed, allowing the limiting tenon and limiting ring to be smoothly inserted and installed through the top opening of the beam-prevention hole according to the normal procedure. Simultaneously, the cap also improves the forming quality of the top of the beam-prevention hole. 2. The present invention provides a construction method for a box girder. By using the sealing cap to seal the top of the upper sleeve, a concrete obstruction area will not be formed at the top of the formed anti-fall beam hole, thereby allowing the limiting steel tenon and limiting ring to be smoothly inserted and installed from the top opening of the anti-fall beam hole according to the normal procedure. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the first structure of a sealing cover for preventing beams from falling during construction.

[0024] Figure 2 This is a front view of a sealing cover used for preventing beams from falling during construction.

[0025] Figure 3 This is a top view of a sealing cover used for preventing beams from falling during construction.

[0026] Figure 4 This is a schematic diagram of the second structure of a sealing cover for preventing beams from falling during construction.

[0027] Figure 5 This is a schematic diagram of a sealing cover for preventing beams from falling during construction, after installation.

[0028] Figure 6 This is a top view of a sealing cover used to prevent beams from falling during construction, after installation.

[0029] Figure 7 for Figure 6 A cross-sectional view along section line AA.

[0030] Figure 8 for Figure 7 Enlarged detailed view of region B in the middle.

[0031] Figure 9 A schematic diagram showing the formed holes to prevent beam drop.

[0032] Figure 10 This is a schematic diagram showing the arrangement of anti-fall-beam holes on a box girder.

[0033] Figure 11 for Figure 10 Enlarged detail of region C.

[0034] Marked in the image: 1-plane, 2-slope, 3-hole plug 4-Exhaust port, 5-groove, 501 - Air valve, 502 - Misalignment 6-Airbags 7-Slot cover, 8-Box girder, 801-Bottom plate, 802-Chamfer, 8021-Blocking area, 803-Body plate, 804-Top plate 9-Upper sleeve, 10 - Lower sleeve. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0036] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer," etc., used in the description of specific embodiments of the present invention to indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0037] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present invention.

[0038] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0039] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0040] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to connection methods commonly used in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0041] Example 1 like Figures 1 to 8 As shown, a sealing cover for a beam-prevention hole during construction includes a hole plug 3 and a cover plate.

[0042] The cover plate is connected to the top of the plug 3. The top of the cover plate is provided with a plane 1 and an inclined plane 2. The included angle between the inclined plane 2 and the plane 1 is adapted to the included angle between the chamfer 802 of the box beam 8 and the bottom plate 801. The projection shape and size of the cover plate in the horizontal direction are adapted to the cross-sectional shape and size of the anti-fall beam hole. The plug 3 can be engaged with the upper sleeve 9 in the anti-fall beam hole. The cover plate is provided with an exhaust hole 4, which penetrates the cover plate and the plug 3 along the thickness direction of the cover plate.

[0043] Specifically, the plug 3 is located at the center of the bottom surface of the cover plate. There can be multiple vent holes 4, and the shape of the vent holes 4 can be circular or square. When the vent hole 4 is circular, the corresponding hole diameter can be 5mm-10mm. The cross-sectional shape and dimensions of the plug 3 are consistent with the cross-sectional shape and dimensions of the inner cavity of the upper sleeve 9.

[0044] In an optional embodiment, an airbag 6 may also be included. The airbag 6 is located below the plug 3. A groove 5 is provided on the cover plate at the position of plane 1. An air nozzle 501 is provided in the groove 5. The air nozzle 501 is connected to the airbag 6. The airbag 6 can fill the inner cavity of the upper sleeve 9 by inflation.

[0045] Specifically, the airbag 6 can be made of rubber. The plug 3 and the cover plate have channels, with both ends of the channels communicating with the airbag 6 and the air nozzle 501, respectively. The groove 5 can have a circular cross-sectional shape, a depth of 10mm-16mm, and a diameter of 12mm-18mm. The groove 5 can be located at the center of the cover plate in its horizontal projection.

[0046] In an optional embodiment, a staggered platform 502 can be provided on the side wall at the opening of the groove 5, and a groove cover 7 can be installed at the opening of the groove 5. The groove cover 7 is supported on the staggered platform 502, and the top surface of the groove cover 7 is flush with the plane 1. The groove cover 7 is... Figures 1 to 4 Not shown in the image.

[0047] Specifically, the top surface of the misalignment 502 is 3mm-5mm lower than that of the top surface of the relative plane 1, and the thickness of the groove cover 7 can be 3mm-5mm. The groove cover 7 can be made of plastic or rubber. A spherical groove can be formed on the top surface of the groove cover 7, and a vertical plate can be set inside the spherical groove. The groove cover 7 can be opened and closed by operating this vertical plate. A connecting rope can be provided between the groove cover 7 and the inner wall of the groove 5 to prevent the groove cover 7 from being lost due to careless placement.

[0048] In an optional embodiment, the surface of the airbag 6 may be provided with anti-slip texture. Specifically, the anti-slip texture may be serrated or wavy, and the height of the anti-slip texture protruding from the surface of the airbag 6 may be 0.2mm-0.5mm. The anti-slip texture is made of the same material as the airbag 6 and is integrally formed.

[0049] In an optional embodiment, the cover plate and the plug 3 can be an integrally molded structure, and both the cover plate and the plug 3 can be made of rubber.

[0050] In an optional embodiment, the thickness of the area corresponding to the upper surface 1 of the cover plate can be 3mm-10mm, specifically 3mm, 5mm, 8mm, or 10mm.

[0051] In an optional embodiment, the thickness of the plug 3 can be 20mm-40mm. Specifically, the thickness can be 20mm, 25mm, 30mm, 35mm, or 40mm.

[0052] In an optional embodiment, the top of the cover plate may be provided with a lifting ring, which can be embedded in the cover plate. Specifically, the lifting ring is made of stainless steel or aluminum alloy, and the lifting ring is hinged to the cover plate. The cover plate is provided with an annular groove to accommodate the lifting ring. Neither the lifting ring nor the annular groove is shown in the figure.

[0053] Example 2 A construction method for a box girder, employing a sealing cap for preventing beam fall during construction as described in Example 1, includes the following steps: S1: Tie the reinforcing bars of the box girder 8 and install the upper sleeve 9 to the position of the anti-fall beam hole, which is located at the intersection of the bottom plate 801 and the chamfer 802 of the box girder 8. Specifically, after determining the installation position of the upper sleeve 9, it can be welded to the reinforcing bars of the box girder 8. The lower sleeve 10 can be installed simultaneously with the upper sleeve 9. The bottom end of the upper sleeve 9 is fitted onto the outer wall of the top of the lower sleeve 10.

[0054] S2: Install the sealing cap onto the top of the upper sleeve 9, insert the plug 3 of the sealing cap into the upper sleeve 9, keep the flat surface 1 of the sealing cap flush with the finished surface of the base plate 801, and keep the bevel 2 of the sealing cap flush with the finished surface of the chamfer 802. Specifically, the installation method of the sealing cap can be referred to... Figures 5 to 8 Installation diagram.

[0055] S3: Carry out formwork construction and pour concrete.

[0056] S4: After the concrete reaches the demolding strength, remove the formwork and the sealing cover to complete the construction of the anti-falling beam hole. After the anti-falling beam hole construction is completed, as follows... Figure 9 As shown, chamfer 802 forms a notch at the location of the anti-fall beam hole, and the vertical projection of the notch is flush with the cross-sectional profile of the anti-fall beam hole.

[0057] In an optional embodiment, when the sealing cap includes an airbag 6 and an air nozzle 501, step S2 may further include: inflating the airbag 6 through the air nozzle 501 to expand the volume of the airbag 6 and seal the inner cavity of the upper sleeve 9; step S4 may further include: before removing the sealing cap, deflating the airbag 6 through the air nozzle 501 to shrink the volume of the airbag 6 and separate it from the inner wall of the upper sleeve 9.

[0058] Specifically, after the airbag 6 is inflated, the groove 5 where the air nozzle 501 is located is covered and sealed with the groove cap 7. Before deflating the airbag 6, the groove cap 7 needs to be removed from the groove 5.

[0059] like Figure 10 and Figure 11 As shown, in the prior art, there is a blocking area 8021 above the anti-fall beam hole. The box girder 8 includes a bottom plate 801, a web plate 803, and a top plate 804, with a chamfer 802 between the bottom plate 801 and the web plate 803. When the anti-fall beam hole is located at the intersection of the bottom plate 801 and the chamfer 802, after demolding, due to the presence of the chamfer 802, a blocking area 8021 will be formed at the top of the anti-fall beam hole, preventing the opening of the anti-fall beam hole from being fully exposed.

[0060] Traditional methods would require chiseling the obstructed area 8021 at this location. However, this chiseling process could potentially damage the chamfer 802. Furthermore, this approach would result in poor hole quality, necessitating additional repairs, which would undoubtedly negatively impact the overall appearance.

[0061] The present invention, by setting the sealing cap, effectively avoids the chiseling process for the chamfer 802. In this way, not only is local damage to the chamfer 802 prevented and the forming quality of the hole improved, but additional repair costs are also saved, resulting in a more regular and beautiful overall appearance.

[0062] 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, and improvements 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 cap for preventing beams from falling during construction, characterized in that, Includes a plug (3) and a cover plate, the cover plate being connected to the top of the plug (3), the top of the cover plate having a plane (1) and an inclined plane (2), the included angle between the inclined plane (2) and the plane (1) being adapted to the included angle between the chamfer (802) of the box beam (8) and the bottom plate (801), the projection shape and size of the cover plate in the horizontal direction being adapted to the cross-sectional shape and size of the anti-fall beam hole; the plug (3) can engage with the upper sleeve (9) in the anti-fall beam hole; the The cover plate is provided with an exhaust hole (4), which penetrates the cover plate and the plug (3) along the thickness direction of the cover plate; it also includes an airbag (6), which is located below the plug (3). The cover plate is provided with a groove (5) at the position of the plane (1), and an air nozzle (501) is provided in the groove (5). The air nozzle (501) is connected to the airbag (6), and the airbag (6) can fill the inner cavity of the upper sleeve (9) by inflation.

2. A sealing cover for preventing beams from falling during construction, as described in claim 1, characterized in that, A staggered platform (502) is provided on the side wall at the opening of the groove (5), and a groove cover (7) is installed at the opening of the groove (5). The groove cover (7) is supported on the staggered platform (502), and the top surface of the groove cover (7) is flush with the plane (1).

3. A sealing cover for preventing beams from falling during construction, as described in claim 1, characterized in that, The surface of the airbag (6) is provided with anti-slip texture.

4. A sealing cap for preventing beams from falling during construction, as described in any one of claims 1-3, characterized in that, The cover plate and the hole plug (3) are integrally formed structures, and both the cover plate and the hole plug (3) are made of rubber.

5. A sealing cover for preventing beams from falling during construction, as described in claim 4, characterized in that, The thickness of the area corresponding to the plane (1) on the cover plate is 3mm-10mm.

6. A sealing cover for preventing beams from falling during construction, as described in claim 4, characterized in that, The thickness of the plug (3) is 20mm-40mm.

7. A sealing cover for preventing beams from falling during construction, as described in claim 4, characterized in that, The top of the cover plate is provided with a lifting ring, which can be embedded in the cover plate.

8. A construction method for a box girder, characterized in that, The sealing cover for preventing beams from falling during construction, as described in any one of claims 1-7, comprises the following steps: S1: Tie the reinforcing bars of the box beam (8) and install the upper sleeve (9) to the position of the anti-fall beam hole, which is located at the intersection of the bottom plate (801) and the chamfer (802) of the box beam (8); S2: Install the sealing cap to the top of the upper sleeve (9), insert the plug (3) of the sealing cap into the upper sleeve (9), keep the plane (1) of the sealing cap flush with the finished surface of the bottom plate (801), and keep the inclined surface (2) of the sealing cap flush with the finished surface of the chamfer (802); S3: Carry out formwork construction and pour concrete; S4: After the concrete reaches the demolding strength, remove the formwork and the sealing cover to complete the construction of the anti-fall beam hole.

9. A construction method for a box girder according to claim 8, characterized in that, When the sealing cap includes an airbag (6) and an air nozzle (501), step S2 further includes: inflating the airbag (6) through the air nozzle (501) to expand the volume of the airbag (6) and seal the inner cavity of the upper sleeve (9); step S4 further includes: before removing the sealing cap, deflating the airbag (6) through the air nozzle (501) to shrink the volume of the airbag (6) and separate it from the inner wall of the upper sleeve (9).

Images