Prefabricated permanent formwork reinforced hollow slab bridge structure with locally increased section

Abstract

The utility model discloses a prefabricated permanent formwork locally-increased section reinforced hollow slab bridge structure which comprises a hollow slab bridge, a prefabricated formwork is installed at the bottom of the hollow slab bridge, the outer wall of the prefabricated formwork is coated with FRP cloth, and the FRP cloth is pasted to the bottom of the hollow slab bridge and the bottom of the prefabricated formwork. A cement pouring mechanism is arranged in the prefabricated template; the cement pouring mechanism comprises a pouring pipe, an injection pipe fixedly communicates with the middle position of the bottom of the pouring pipe, the injection pipe penetrates through a through hole formed in the FRP cloth, a plurality of pouring branch pipes uniformly and fixedly communicate with the outer wall of the injection pipe, and openings of the pouring branch pipes face upwards. Cement can be injected into the pouring pipe through the injection pipe and the opened plug cap, the cement is poured into the prefabricated formwork through the pouring branch pipe, the upward pouring branch pipe facilitates the cement to flow from top to bottom, the problem that a pipe opening is blocked by the cement when the cement is poured upwards from the bottom is solved, and cement pouring is smoother.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge engineering, in particular to a prefabricated permanent formwork with a partially enlarged cross-section and reinforced hollow slab bridge structure. Background Art

[0002] With the rapid development of transportation, highway traffic volume and vehicle loads have increased significantly. Due to inherent flaws in design and construction, the influence of the natural environment, and the inherent properties of materials, some completed and operational bridge structures have gradually developed various defects. This is particularly true for the most commonly used prefabricated concrete hollow slab beam bridges. Cracks and hinge joint damage are typical defects of hollow slabs. Due to the increase in slab width, the hollowing ratio of the hollow slab must be increased to achieve structural lightweighting. Therefore, the thickness of the bottom slab, web, and top slab must be reduced during design. This inevitably results in thinner hollow slab walls, resulting in reduced inter-slab stiffness and greater distortional stress, which is a major cause of longitudinal and transverse cracks in the bottom slab. Without reinforcement and renovation of such bridges, hollow slab bridges cannot be put into normal use.

[0003] Thinning the hollow slab reduces its stiffness and local bearing capacity. Under load, this leads to concentrated stresses and exacerbated cracks in the base slab. Common reinforcement techniques, such as surface repair, pressure grouting, caulking, and carbon fiber bonding, appear ineffective in improving stiffness. Steel plate bonding and external prestressing, due to their complex construction processes, result in high on-site construction overhead costs. Considering the distribution of longitudinal cracks in the base slabs of hollow slab girder bridges, insufficient base slab thickness, and inherent water leakage in the slab girder itself, there is room for improvement. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a prefabricated permanent formwork with a partially enlarged cross-section to reinforce a hollow slab bridge structure.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0006] A prefabricated permanent formwork partially enlarges the cross-section of a reinforced hollow slab bridge structure, comprising a hollow slab bridge, a prefabricated formwork installed at the bottom of the hollow slab bridge, an outer wall of the prefabricated formwork covered with FRP cloth, and the FRP cloth is adhered to the hollow slab bridge and the bottom of the prefabricated formwork, and a cement pouring mechanism is provided within the prefabricated formwork;

[0007] The cement pouring mechanism includes a pouring pipe, the middle position of the bottom of the pouring pipe is fixedly connected to an injection pipe, the injection pipe is arranged through a through hole opened on the FRP cloth, and the outer wall of the injection pipe is evenly fixedly connected to a plurality of pouring branch pipes, and the openings of the pouring branch pipes face upward.

[0008] As a further solution of the present invention, the bottom of the hollow slab bridge is roughened.

[0009] As a further solution of the present invention, both ends of the perfusion tube are open, and plug caps are installed at the openings.

[0010] As a further solution of the present invention, both ports of the prefabricated template are detachably mounted with cover plates by means of screws, and the cover plates are provided with holes for the perfusion tube to pass through.

[0011] As a further solution of the present invention, two symmetrical support plates are fixed to the bottom of the perfusion tube, and the bottoms of the support plates are in contact with the inner wall of the prefabricated template to increase the contact area.

[0012] As a further solution of the present invention, a second mounting plate is fixed on both sides of the outer wall of the support plate, and the second mounting plate is fixed to the FRP cloth by bolts and nuts. The outer wall of the perfusion pipe is evenly fixed with a first mounting plate, and screw holes are opened on the first mounting plate. The first mounting plate is fixed to the hollow plate bridge by screws, and the perfusion pipe is further reinforced by the second mounting plate and the FRP cloth. The perfusion pipe and the hollow plate bridge are further reinforced by the first mounting plate. Combined with the bonding of the FRP cloth, the cover plate and the hollow plate bridge, a more stable connection is achieved.

[0013] The beneficial effects of the utility model are:

[0014] The utility model adopts a hollow slab bridge, a prefabricated formwork, an FRP cloth and a cement pouring mechanism, the cement pouring mechanism includes a pouring pipe, an injection pipe, a pouring branch pipe and a plug cap, etc. The injection pipe is arranged through the FRP cloth. Through the above design, cement can be injected into the pouring pipe through the injection pipe and the open plug cap. The cement is poured into the interior of the prefabricated formwork through the pouring branch pipe, and the upward-facing pouring branch pipe facilitates the flow of cement from top to bottom, avoiding the problem of cement blocking the pipe mouth when pouring from the bottom to top, making the pouring of cement smoother.

[0015] The utility model: the perfusion pipe is further reinforced by the second mounting plate and the FRP cloth, the perfusion pipe and the hollow slab bridge are further reinforced by the first mounting plate, and combined with the bonding of the FRP cloth, the cover plate and the hollow slab bridge, a more stable connection is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1This is a schematic diagram of the three-dimensional structure of a prefabricated permanent formwork with a partially enlarged cross-section to reinforce a hollow slab bridge proposed by the present invention;

[0017] Figure 2 This is a schematic diagram of a partially unfolded three-dimensional structure of a prefabricated permanent formwork with a partially enlarged cross-section to reinforce a hollow slab bridge proposed in the present invention;

[0018] Figure 3 This is a schematic diagram of the partial three-dimensional structure of a prefabricated permanent formwork with a partially enlarged cross-section to reinforce a hollow slab bridge proposed in the present invention;

[0019] Figure 4 This utility model proposes a method for partially enlarging the cross section of a prefabricated permanent formwork to reinforce a hollow slab bridge. Figure 3 Enlarged structural diagram at point A in the middle.

[0020] In the figure: 1. Hollow slab bridge; 2. Precast formwork; 3. FRP cloth; 301. Through hole; 4. Cover plate; 5. Injection pipe; 501. Plug cap; 6. Injection pipe; 7. First mounting plate; 8. Support plate; 9. Injection branch pipe; 10. Second mounting plate. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0022] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] Reference Figure 1-Figure 4 A prefabricated permanent formwork partially enlarges the cross-section of a reinforced hollow slab bridge structure, comprising a hollow slab bridge 1, a prefabricated formwork 2 installed at the bottom of the hollow slab bridge 1, an outer wall of the prefabricated formwork 2 covered with an FRP cloth 3, and the FRP cloth 3 is adhered to the hollow slab bridge 1 and the bottom of the prefabricated formwork 2, and a cement pouring mechanism is provided in the prefabricated formwork 2;

[0024] The cement pouring mechanism includes a pouring pipe 5, the middle position of the bottom of the pouring pipe 5 is fixedly connected to an injection pipe 6, the injection pipe 6 is set through the through hole 301 opened on the FRP cloth 3, and the outer wall of the injection pipe 6 is evenly fixedly connected to a number of pouring branch pipes 9, and the openings of the pouring branch pipes 9 are facing upward.

[0025] In this embodiment, the bottom of the hollow slab bridge 1 is roughened.

[0026] In this embodiment, both ends of the perfusion tube 5 are open, and plug caps 501 are installed at the openings.

[0027] In this embodiment, both ends of the prefabricated template 2 are detachably mounted with cover plates 4 by means of screws, and the cover plates 4 are provided with holes for the perfusion pipe 5 to pass through.

[0028] In this embodiment, two symmetrical support plates 8 are fixed to the bottom of the perfusion pipe 5 , and the bottoms of the support plates 8 are in contact with the inner wall of the prefabricated template 2 to increase the contact area.

[0029] In this embodiment, second mounting plates 10 are fixed on both sides of the outer wall of the support plate 8, and the second mounting plates 10 are fixed to the FRP cloth 3 by bolts and nuts. The outer wall of the perfusion pipe 5 is evenly fixed with a first mounting plate 7, and screw holes are opened on the first mounting plate 7. The first mounting plate 7 is fixed to the hollow slab bridge 1 by screws. The perfusion pipe 5 is further reinforced with the FRP cloth 3 through the second mounting plate 10. The perfusion pipe 5 and the hollow slab bridge 1 are further reinforced by the first mounting plate 7. Combined with the bonding of the FRP cloth 3, the cover plate 4 and the hollow slab bridge 1, a more stable connection is achieved.

[0030] Working principle: When in use, through the hollow slab bridge 1, prefabricated formwork 2, FRP cloth 3 and cement pouring mechanism, the cement pouring mechanism includes a pouring pipe 5, an injection pipe 6, a pouring branch pipe 9 and a plug cap 501, etc. The injection pipe 6 is set through the FRP cloth 3. Through the above design, cement can be injected into the pouring pipe 5 through the injection pipe 6 and the open plug cap 501. The cement is poured into the prefabricated formwork 2 through the pouring branch pipe 9, and the upward pouring branch pipe 9 facilitates the flow of cement from top to bottom, avoiding the problem of cement blocking the pipe mouth when pouring from the bottom up, making the pouring of cement smoother; the pouring pipe 5 is further reinforced with the FRP cloth 3 through the second mounting plate 10, and the pouring pipe 5 and the hollow slab bridge 1 are further reinforced by the first mounting plate 7. Combined with the bonding of the FRP cloth 3, the cover plate 4 and the hollow slab bridge 1, a more stable connection is achieved.

[0031] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship of a device or feature to other devices or features as shown in the figures. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figures. For example, if the device in the drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0033] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A prefabricated permanent formwork partially enlarges the cross-section of a reinforced hollow slab bridge structure, comprising a hollow slab bridge (1), characterized in that: A prefabricated template (2) is installed at the bottom of the hollow slab bridge (1), the outer wall of the prefabricated template (2) is covered with FRP cloth (3), and the FRP cloth (3) is adhered to the bottom of the hollow slab bridge (1) and the prefabricated template (2), and a cement pouring mechanism is provided in the prefabricated template (2); The cement pouring mechanism comprises a pouring pipe (5), the bottom middle position of the pouring pipe (5) is fixedly connected to an injection pipe (6), the injection pipe (6) is arranged through a through hole (301) provided on the FRP cloth (3), and the outer wall of the injection pipe (6) is evenly fixedly connected to a plurality of pouring branch pipes (9), and the openings of the pouring branch pipes (9) face upward.

2. A prefabricated permanent formwork partially enlarged cross-section reinforced hollow slab bridge structure according to claim 1, characterized in that: The bottom of the hollow slab bridge (1) is roughened.

3. A prefabricated permanent formwork partially enlarged cross-section reinforced hollow slab bridge structure according to claim 2, characterized in that: Both ends of the perfusion tube (5) are open, and plug caps (501) are installed at the openings.

4. A prefabricated permanent formwork partially enlarged cross-section reinforced hollow slab bridge structure according to claim 3, characterized in that: Both ends of the prefabricated template (2) are detachably mounted with cover plates (4) via screws, and the cover plates (4) are provided with holes for the perfusion tube (5) to pass through.

5. A prefabricated permanent formwork partially enlarged cross-section reinforced hollow slab bridge structure according to claim 4, characterized in that: Two symmetrical support plates (8) are fixed to the bottom of the perfusion pipe (5), and the bottoms of the support plates (8) are in contact with the inner wall of the prefabricated template (2).

6. A prefabricated permanent formwork partially enlarged cross-section reinforced hollow slab bridge structure according to claim 5, characterized in that: Second mounting plates (10) are fixed to both sides of the outer wall of the support plate (8), and the second mounting plates (10) are fixed to the FRP cloth (3) by means of bolts and nuts.

7. A prefabricated permanent formwork partially enlarged cross-section reinforced hollow slab bridge structure according to claim 6, characterized in that: A first mounting plate (7) is evenly fixed to the outer wall of the perfusion pipe (5), screw holes are provided on the first mounting plate (7), and the first mounting plate (7) is fixed to the hollow plate bridge (1) by screws.

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