A joint structure for lengthening a concrete box culvert

Abstract

This utility model relates to the technical field of box culvert connection, and particularly to a structural design for extending an existing concrete box culvert. Its construction is simple and convenient, effectively improving construction efficiency, shortening the construction cycle, and ensuring structural safety and stability. It includes a concrete box culvert, a corrugated steel box culvert, and a connection mechanism for connecting the concrete box culvert and the corrugated steel box culvert. The connection mechanism includes reinforcing bars embedded in the concrete box culvert, an enlarged flange detachably connected to the reinforcing bars, a rib plate fixedly connected to the enlarged flange, an installation flange fixedly connected to the end of the corrugated steel box culvert, and a steel template surrounding the connection point between the concrete box culvert and the corrugated steel box culvert. One end of the steel template is detachably connected to the enlarged flange, and the other end of the steel template is connected to the outer wall of the corrugated steel box culvert. The steel template, the enlarged flange, the rib plate, and the outer wall of the corrugated steel box culvert form a closed cavity, which is filled with concrete.

Description

Technical Field

[0001] This utility model relates to the technical field of box culvert connection, and in particular to a structure for extending an existing concrete box culvert joint. Background Technology

[0002] Corrugated steel sheets have strong resistance to deformation, are quick and easy to install, saving construction time, and also have advantages such as low cost and environmental friendliness. The application of corrugated steel structures is gradually increasing. For example, in road widening projects, culverts need to be lengthened. Old culverts mostly use reinforced concrete structures, which have long construction cycles and are greatly affected by weather factors. Corrugated steel structures are prefabricated in factories and assembled on site, with short construction cycles and less impact on road traffic. During construction, it is necessary to connect and extend the concrete culverts.

[0003] For example, Chinese utility model patent CN207672628U discloses a device for treating expansion joints at the connection between cast-in-place concrete drainage box culverts and existing box culverts. An expansion joint is provided at the connection between the cast-in-place and existing box culverts. The device is installed within the expansion joint. A grouting conduit is provided within the cast-in-place drainage box culvert, and the grouting conduit is connected to the expansion joint via a grouting pipe. The device includes a cement-based crystallizing binder and a waterstop strip. The cement-based crystallizing binder and the waterstop strip fill the expansion joint, and all four sides of the waterstop strip are connected to the cement-based crystallizing binder. It has the advantages of simple and stable structure, practical function, and good waterproofing and seepage prevention effect.

[0004] However, when the inventors implemented this device, they found the following defects: Although the above-mentioned casting method can achieve a good waterproof effect in connecting the old and new culverts, the connection strength is not good, which affects the support strength of the culvert connection. Moreover, the grouting construction requires formwork and sealing, which makes the construction process complicated, the construction period long, and the construction convenience and efficiency need to be further improved. Utility Model Content

[0005] (a) Technical problems to be solved

[0006] To address the shortcomings of existing technologies, this utility model provides a simple and convenient construction method for extending existing concrete box culvert joints, which effectively improves construction efficiency, shortens the construction cycle, and ensures structural safety and stability.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, this utility model provides the following technical solution: a joint structure for an existing concrete box culvert, comprising a concrete box culvert, a corrugated steel box culvert, and a connecting mechanism for connecting the concrete box culvert and the corrugated steel box culvert. The connecting mechanism includes a rebar embedded in the concrete box culvert, an enlarged flange detachably connected to the rebar, a rib plate fixedly connected to the enlarged flange, an installation flange fixedly connected to the end of the corrugated steel box culvert, and a steel template surrounding the connection point of the concrete box culvert and the corrugated steel box culvert. One end of the steel template is detachably connected to the enlarged flange, and the other end of the steel template is connected to the outer wall of the corrugated steel box culvert. The steel template, the enlarged flange, the rib plate, and the outer wall of the corrugated steel box culvert form a closed cavity, and concrete is poured into the closed cavity. Furthermore, the end of the rebar is provided with a threaded portion, and the enlarged flange is provided with bolt holes corresponding to the rebar. The end of the rebar passes through the bolt holes, and a nut is screwed into the threaded portion. The detachable connection between the enlarged flange and the rebar is achieved through the nut. The steel template is detachably connected to the enlarged flange and the outer wall of the corrugated steel box culvert by bolts.

[0009] Preferably, the closed cavity is provided with a concrete hoop, one end of which extends above the rib plate and the other end of which extends above the corrugated steel box culvert.

[0010] Preferably, the concrete hoop is provided with reinforcing bars; further, the reinforcing bars are in multiple groups, and the multiple groups of reinforcing bars are equidistantly distributed on the outer wall of the concrete hoop.

[0011] Preferably, it also includes a shear member, the concrete hoop being fixedly connected to the outer wall of the corrugated steel box culvert via the shear member. The shear member includes a bent rod and an installation nut. The installation nut is fixedly installed on the outer wall of the corrugated steel box culvert. The concrete hoop has a through hole. The vertical section of the bent rod passes through the through hole and is screwed into the installation nut. The horizontal section of the bent rod is in close contact with the concrete hoop.

[0012] Preferably, the mounting nut is installed in the trough of the corrugated steel plate on the corrugated steel box culvert.

[0013] Preferably, a foamed sealing gasket is provided between the enlarged flange and the outer wall of the concrete box culvert, and the enlarged flange and the outer wall of the concrete box culvert are flexibly sealed and connected by the foamed sealing gasket.

[0014] Preferably, a rubber sealing gasket is provided between the mounting flange and the rib plate, and the mounting flange and the rib plate are sealed together by the rubber sealing gasket.

[0015] (III) Beneficial Effects

[0016] Compared with existing technologies, this utility model provides a structural extension joint for existing concrete box culverts, offering the following advantages: It uses corrugated steel box culverts to extend the original concrete box culverts; the connection at the joint is achieved through a connecting structure that effectively meets various load requirements; it not only improves the stability and safety of the structure but also provides good durability and economy. This connecting structure ensures the strength and stability of the connection, enabling it to withstand various complex loads. By using corrugated steel box culverts for extension, the overall structure becomes more compact and lightweight, while also improving the convenience and efficiency of construction and significantly shortening the construction cycle. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the cross-sectional structure of the connection between the concrete box culvert and the corrugated steel box culvert of this utility model.

[0018] Figure 2 This is the utility model Figure 1 A magnified view of the structure at point A in the middle;

[0019] Figure 3 This is a schematic diagram of the planar structure at the connection port of the concrete box culvert of this utility model;

[0020] Figure 4 This is a schematic diagram of the connection state of the concrete box culvert and the corrugated steel box culvert of this utility model.

[0021] Figure 5 This is a schematic diagram of the rubber sealing gasket in the installation state of this utility model;

[0022] Figure 6 This is the utility model Figure 2 A magnified schematic diagram of the structure at point B in the middle;

[0023] The following labels are used in the attached diagram: 1. Concrete box culvert; 2. Corrugated steel box culvert; 3. Rebar installation; 4. Enlarged flange; 5. Rib plate; 6. Mounting flange; 7. Steel formwork; 8. Concrete hoop; 9. Reinforcing steel bar; 10. Bending rod; 11. Mounting nut; 12. Foamed sealing gasket; 13. Rubber sealing gasket. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1-6This utility model discloses a joint structure for an existing concrete box culvert 1, comprising a concrete box culvert 1, a corrugated steel box culvert 2, and a connecting mechanism for connecting the concrete box culvert 1 and the corrugated steel box culvert 2. The connecting mechanism includes a reinforcing bar 3 embedded in the concrete box culvert 1, an enlarged flange 4 detachably connected to the reinforcing bar 3, a rib plate 5 fixedly connected to the enlarged flange 4, an installation flange 6 fixedly connected to the end of the corrugated steel box culvert 2, and a steel template 7 surrounding the connection point of the concrete box culvert 1 and the corrugated steel box culvert 2. One end of the steel template 7 is detachably connected to the enlarged flange 4. The steel formwork 7 is connected to the outer wall of the corrugated steel box culvert 2 at the other end. The steel formwork 7, the enlarged flange 4, the rib 5 and the outer wall of the corrugated steel box culvert 2 form a closed cavity, which is filled with concrete. Furthermore, the end of the rebar 3 is provided with a threaded part, and the enlarged flange 4 is provided with bolt holes corresponding to the rebar 3. The end of the rebar 3 passes through the bolt holes, and a nut is screwed into the threaded part. The detachable connection between the enlarged flange 4 and the rebar 3 is achieved by the nut. The steel formwork 7 is detachably connected to the enlarged flange 4 and the outer wall of the corrugated steel box culvert 2 by bolts.

[0026] The corrugated steel box culvert 2 and the connecting mechanism can be prefabricated. By adopting the above-mentioned prefabricated structure through the connecting mechanism, all structural components can be assembled with bolts, which can realize the rapid connection and assembly of the corrugated steel box culvert 2 and the original concrete box culvert 1, greatly shortening the construction cycle of extending the length of the concrete box culvert 1. Concrete is poured into the closed cavity of the connecting structure, which greatly improves the load-bearing capacity of the structure, and at the same time effectively improves the connection strength between the corrugated steel box culvert 2 and the original concrete box culvert 1.

[0027] For details, please refer to Figure 2 A concrete hoop 8 is provided inside the closed cavity. One end of the concrete hoop 8 extends above the rib plate 5, and the other end of the concrete hoop 8 extends above the corrugated steel box culvert 2.

[0028] The concrete hoop 8 is provided with reinforcing bars 9; furthermore, the reinforcing bars 9 are in multiple groups, and the multiple groups of reinforcing bars 9 are equidistantly distributed on the outer wall of the concrete hoop 8.

[0029] It also includes shear members. The concrete hoop 8 is fixedly connected to the outer wall of the corrugated steel box culvert 2 through the shear members. The shear members include a bent rod 10 and a mounting nut 11. The mounting nut 11 is fixedly installed on the outer wall of the corrugated steel box culvert 2. The concrete hoop 8 is provided with a through hole. The vertical rod segment on the bent rod 10 passes through the through hole and is screwed into the mounting nut 11. The horizontal rod segment on the bent rod 10 is in close contact with the concrete hoop 8.

[0030] The existing concrete box culvert extension joint structure provided in this embodiment uses a concrete hoop 8 to improve the structural strength of the cast concrete within the closed cavity. One end of the concrete hoop 8 is located above the rib plate 5, extending upwards towards the corrugated steel box culvert 2. Under the action of the concrete hoop 8, the load at the connection mechanism can be transferred to the rib plate 5 and the corrugated steel box culvert 2, preventing load concentration at the connection between the corrugated steel box culvert 2 and the rib plate 5, further improving the structural strength of the connection mechanism. The reinforcing steel bar 9 further enhances the bearing capacity of the concrete hoop 8, thereby increasing the ultimate bearing capacity of the connection mechanism. A shear member can be used for initial fixing and limiting of the concrete hoop 8 during installation. The shear member connects the end of the corrugated steel box culvert 2 to the end of the concrete hoop 8 furthest from the concrete box culvert 1, balancing the force transfer between the rib plate 5 and the corrugated steel box culvert 2, and simultaneously forming the structural skeleton of the cast concrete within the closed cavity, further improving the bearing strength of the connection mechanism.

[0031] Specifically, the mounting nut 11 is installed in the trough of the corrugated steel plate on the corrugated steel box culvert 2.

[0032] Specifically, a foamed sealing gasket 12 is provided between the expanded flange 4 and the outer wall of the concrete box culvert 1, and the expanded flange 4 and the outer wall of the concrete box culvert 1 are flexibly sealed and connected by the foamed sealing gasket 12.

[0033] Specifically, a rubber sealing gasket 13 is provided between the mounting flange 6 and the rib plate 5, and the mounting flange 6 and the rib plate 5 are sealed and connected by the rubber sealing gasket 13.

[0034] The mounting nut 11 is located within the trough of the corrugated steel plate on the corrugated steel box culvert 2, making it less prone to slippage and displacement during installation, thus improving the ease of installation and the accuracy of its position. The foamed sealing gasket 12 provides a good seal between the existing concrete box culvert 1 and the enlarged flange 4, exhibiting excellent waterproof performance and effectively preventing the infiltration of groundwater and rainwater. The rubber sealing gasket 13 improves the sealing between the mounting flange 6 and the rib plate 5, preventing grout from flowing out between them.

[0035] During use, insert rebar 3 into the port of the existing concrete box culvert 1, install foam sealing gasket 12, then fasten the rebar 3 to the enlarged flange 4 with nuts, attach the rubber sealing gasket 13 to the mounting flange 6, and fasten the mounting flange 6 to the rib plate 5 with bolts. Connect the concrete hoop 8 to the corrugated steel plate through shear members, install reinforcing steel bars 9 on the outer wall of the concrete hoop 8, connect both ends of the steel formwork 7 to the enlarged flange 4 and the outer wall of the corrugated steel box culvert 2 respectively, pour concrete into the closed cavity, and after the concrete has cured, complete the connection between the concrete box culvert 1 and the corrugated steel box culvert 2.

[0036] It should be noted that the embodiments referred to in the specification, such as "one embodiment," "embodiment," "exemplary embodiment," and "some embodiments," may include specific features, structures, or characteristics, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Moreover, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not, is within the knowledge scope of those skilled in the art.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A joint structure for extending an existing concrete box culvert, characterized in that; The system includes a concrete box culvert (1), a corrugated steel box culvert (2), and a connecting mechanism for connecting the concrete box culvert (1) and the corrugated steel box culvert (2). The connecting mechanism includes a rebar (3) embedded in the concrete box culvert (1), an enlarged flange (4) detachably connected to the rebar (3), a rib plate (5) fixedly connected to the enlarged flange (4), an installation flange (6) fixedly connected to the end of the corrugated steel box culvert (2), and a steel template (7) surrounding the connection between the concrete box culvert (1) and the corrugated steel box culvert (2). One end of the steel template (7) is detachably connected to the enlarged flange (4), and the other end of the steel template (7) is connected to the outer wall of the corrugated steel box culvert (2). The steel template (7), the enlarged flange (4), the rib plate (5), and the outer wall of the corrugated steel box culvert (2) form a closed cavity, and concrete is poured into the closed cavity.

2. The existing concrete box culvert extension joint structure according to claim 1, characterized in that, The closed cavity is provided with a concrete hoop (8), one end of which extends above the rib plate (5), and the other end of which extends above the corrugated steel box culvert (2).

3. The existing concrete box culvert extension joint structure according to claim 2, characterized in that, The concrete hoop (8) is provided with reinforcing steel bars (9).

4. The existing concrete box culvert extension joint structure according to claim 3, characterized in that, It also includes shear members. The concrete hoop (8) is fixedly connected to the outer wall of the corrugated steel box culvert (2) through the shear members. The shear members include a bent rod (10) and a mounting nut (11). The mounting nut (11) is fixedly installed on the outer wall of the corrugated steel box culvert (2). The concrete hoop (8) is provided with a through hole. The vertical rod segment on the bent rod (10) passes through the through hole and is screwed into the mounting nut (11). The horizontal rod segment on the bent rod (10) is in close contact with the concrete hoop (8).

5. The existing concrete box culvert extension joint structure according to claim 4, characterized in that, The mounting nut (11) is installed in the trough of the corrugated steel plate on the corrugated steel box culvert (2).

6. The existing concrete box culvert extension joint structure according to claim 1, characterized in that, A foamed sealing gasket (12) is provided between the enlarged flange (4) and the outer wall of the concrete box culvert (1), and the enlarged flange (4) and the outer wall of the concrete box culvert (1) are flexibly sealed and connected by the foamed sealing gasket (12).

7. The existing concrete box culvert extension joint structure according to claim 1, characterized in that, A rubber gasket (13) is provided between the mounting flange (6) and the rib plate (5), and the mounting flange (6) and the rib plate (5) are sealed together by the rubber gasket (13).

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