A bridge abutment structure

Abstract

This utility model discloses a bridge abutment structure, which includes: a bridge abutment foundation; abutment body and side walls on top of the foundation, which are integrally connected by cast-in-place construction; abutment cap and back wall on top of the abutment body; and a support between the abutment and the main beam on the abutment cap. The back wall includes a pre-cast section and a post-cast section for retaining soil. The pre-cast section is integrally connected to the abutment body and side walls, and the post-cast section is integrally connected to the pre-cast section and the abutment body. This utility model utilizes the pre-cast section of the back wall to form a retaining structure during the construction of the main beam, enabling rapid traffic flow behind the abutment and solving the problem in existing technologies where the road behind the abutment cannot be opened to traffic due to the lack of back wall construction during the main beam construction period.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, specifically to a bridge abutment structure. Background Technology

[0002] Bridge abutments are structures used to support the superstructure of a bridge span and connect it to the embankments on both banks. For conventional bridge abutments, when the main girder is cast-in-place prestressed concrete, the abutment backing is generally not poured during abutment construction to facilitate prestressing tensioning. The abutment backing is poured and the roadbed behind the abutment is backfilled after the main girder is poured and prestressing is completed, resulting in a long construction period. If the bridge is located in an urban area or other busy traffic section and intersects with existing roads at grade, the road behind the abutment will be impassable during the main girder construction if the abutment backing is not constructed, impacting local traffic. Furthermore, for the main girder, access holes are generally installed at the bottom of the girder to facilitate maintenance during the bridge's operational period. Later, maintenance is required via specialized maintenance vehicles or ladders through these access holes, making the maintenance process cumbersome and inconvenient.

[0003] Patent CN108729345B discloses a bridge design for facilitating the inspection of expansion joints. The bridge includes an abutment body, an abutment back wall, supports, and a main beam. The abutment back wall extends vertically upwards from one side of the upper surface of the abutment body. Supports are located on the other side of the upper surface of the abutment body, and the main beam is mounted on the supports. A pre-reserved joint and an inspection passage are arranged sequentially from top to bottom and are interconnected between the main beam and the abutment back wall. Expansion joints are provided in the pre-reserved joints. This invention provides an inspection passage between the abutment back wall and the main beam, allowing maintenance personnel to easily inspect the expansion joints. However, this invention does not disclose any content related to facilitating the prestressing tensioning of the main beam or optimizing traffic flow behind the abutment during the main beam construction.

[0004] Utility model patent CN219280463U discloses a slotted railway T-shaped bridge abutment for easy tensioning of cast-in-place beams, belonging to the field of railway bridge engineering, and representing a novel railway bridge abutment structure. This utility model includes a cast-in-place beam, a slot, a top, a cap, a support, a front wall, a body, supporting pads, anti-falling blocks, and abutment foundation. After the cast-in-place beam is completed, prestressing tensioning and anchoring are performed at the pre-reserved slot before casting the top of the abutment. This pre-reserved slot can also serve as a maintenance and operation space for the railway bridge supports. However, this utility model does not disclose any content regarding optimizing traffic flow behind the abutment during main beam construction. Utility Model Content

[0005] The purpose of this utility model application is to address the shortcomings of the above-mentioned technology by providing a bridge abutment structure. By setting a pre-cast section and a post-cast section of the back wall, the pre-cast section of the back wall forms a retaining structure during the construction of the main beam, enabling rapid traffic passage behind the abutment. This solves the problem in the prior art where the road behind the abutment cannot be opened to traffic due to the back wall not being constructed during the construction of the main beam.

[0006] To achieve the above objectives, the bridge abutment structure provided by this utility model adopts the following technical solution:

[0007] A bridge abutment structure includes: an abutment foundation, abutment body and side walls on top of the foundation, the abutment body and side walls being integrally connected by cast-in-place construction, abutment cap and back wall on top of the abutment body, and a support between the abutment and the main beam on the abutment cap; the back wall includes a pre-cast section and a post-cast section for retaining soil, the pre-cast section being integrally connected to the abutment body and side walls by cast-in-place construction, and the post-cast section being integrally connected to the pre-cast section and the abutment body by cast-in-place construction. By adopting this technical solution, the back wall is cast in two sections: the pre-cast section and the post-cast section. The pre-cast section is cast together with the abutment body, abutment cap, and side walls after the abutment foundation is constructed. This pre-cast section forms a retaining structure, allowing traffic access behind the abutment without waiting for the main beam construction to be completed, thus solving the problem of traffic access behind the abutment during the main beam construction period.

[0008] Optionally, horizontal reinforcing bars are provided between the pre-cast section and the post-cast section of the back wall. This technical solution enhances the connection strength between the pre-cast and post-cast sections of the back wall.

[0009] Optionally, vertical reinforcing bars are provided between the post-cast section of the back wall and the abutment. This technical solution enhances the connection strength between the post-cast section of the back wall and the abutment.

[0010] Optionally, a gap is provided between the back wall and the main beam to allow personnel to pass through. By adopting this technical solution, personnel can use the platform as an operating platform and perform prestressing tensioning of the main beam through the reserved gap, thus facilitating construction.

[0011] Optionally, the upper end of the post-cast section of the back wall is provided with a cantilever for the post-cast section of the back wall. By adopting this technical solution, it can be ensured that after the post-cast section of the back wall is poured, the reserved gap between the back wall and the main beam is still retained, facilitating personnel to pass between the back wall and the main beam.

[0012] Optionally, the main beam is provided with a manhole at the beam end for personnel access. By adopting this technical solution, after the bridge construction is completed, maintenance personnel can easily enter the main beam for inspection and maintenance through the reserved gap and the manhole at the beam end.

[0013] The beneficial effects achieved by this utility model are:

[0014] 1. The back wall is poured in two sections: the pre-cast section and the post-cast section. The pre-cast section is poured together with the abutment body, abutment cap and side walls after the abutment foundation is completed, forming a retaining structure to enable rapid traffic flow behind the abutment without having to wait until the main beam is completed to open the traffic behind the abutment, thus solving the problem of traffic flow behind the abutment during the construction of the main beam.

[0015] 2. Since the back wall section is poured first without waiting for the main beam to be constructed first, the construction period is shortened and the overall economic benefits of the project are improved. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a partial structural schematic diagram of the back wall component of this utility model;

[0018] Figure 3 This is a partial structural schematic diagram of the back wall component of this utility model;

[0019] Figure 4 This is a partial structural schematic diagram of the back wall component of this utility model;

[0020] Figure 5 This is a schematic diagram illustrating the implementation steps of this utility model.

[0021] The components include: 1. Abutment foundation; 2. Abutment body; 3. Abutment cap; 4. Side wall; 5. Back wall; 5.1. Pre-cast section of back wall; 5.2. Post-cast section of back wall; 5.2.1. Cantilever of post-cast section of back wall; 6. Main beam; 6.1. Manhole at the end of main beam; 7. Support between abutment and main beam; 8. Reserved gap between back wall and main beam; 9. Horizontal connecting reinforcement of back wall; 10. Vertical connecting reinforcement of back wall. Detailed Implementation

[0022] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] The following is in conjunction with the appendix Figures 1-5 The present invention will be described in further detail below.

[0026] like Figure 1 , Figure 2 As shown, a bridge abutment structure includes: a bridge abutment foundation 1, abutment body 2 and side walls 4 on the top of the bridge abutment foundation 1, the abutment body 2 and side walls 4 being integrally connected by cast-in-place construction, abutment cap 3 and back wall 5 on the top of the abutment body 2, the abutment cap 3 being provided with a bridge abutment-main beam support 7 for supporting the main beam 6; the back wall 5 includes a pre-cast section 5.1 and a post-cast section 5.2 for retaining soil, the pre-cast section 5.1 being integrally connected to the abutment body 2 and side walls 4 by cast-in-place construction, and the post-cast section 5.2 being integrally connected to the pre-cast section 5.1 and the abutment body 2 by cast-in-place construction.

[0027] A pre-reserved gap 8 for personnel passage is provided between the back wall 5 and the main beam 6. In some embodiments, the width of the pre-reserved gap 8 between the back wall and the main beam is not less than 0.8m and the height is not less than 1.8m. The upper end of the post-cast section 5.2 of the back wall is provided with a cantilever 5.2.1 for the post-cast section of the back wall. The main beam 6 is provided with a manhole 6.1 at the beam end for personnel entry.

[0028] like Figure 3 As shown, a horizontal connecting steel bar 9 is provided between the pre-cast section 5.1 and the post-cast section 5.2 of the back wall.

[0029] like Figure 4 As shown, vertical connecting steel bars 10 for the back wall are provided between the post-cast section 5.2 of the back wall and the abutment 2.

[0030] like Figure 5 As shown, the specific implementation steps of this utility model embodiment are as follows:

[0031] S1, Construction of bridge abutment foundation 1;

[0032] S2, pour the abutment body 2, abutment cap 3, side wall 4, and back wall pre-poured section 5.1, and at the same time install the horizontal connecting steel bars 9 of the back wall. Since the abutment has formed a retaining structure at this construction stage, traffic can pass behind the abutment.

[0033] S3, main beam 6, with a manhole 6.1 at the beam end inside the main beam 6, and the main beam 6 and the abutment are connected by a support 7 between the abutment and the main beam;

[0034] S4. Construction workers use platform 2 as an operating platform and tension the prestressed steel bars of main beam 6 through the gap 8 reserved between back wall 5 and main beam 6.

[0035] S5. Pour the post-cast section 5.2 of the back wall and install the vertical connecting steel bars 10 of the back wall at the same time. By setting the cantilever 5.2.1 of the post-cast section 5.2 at the upper end of the back wall, there is still a reserved gap 8 between the back wall 5 and the main beam 6 after the back wall 5 is constructed.

[0036] S6. During operation, maintenance personnel can easily enter the interior of the main beam 6 for inspection and maintenance through the reserved gap 8 between the back wall and the main beam and the manhole 6.1 at the end of the main beam.

[0037] This utility model has the following advantages:

[0038] 1. The back wall section 5.1 is poured together with the abutment body 2, abutment cap 3 and side wall 4 to form a retaining structure to enable rapid traffic passage behind the abutment, without having to wait for the main beam 6 to be completed before opening the traffic behind the abutment, thus solving the problem of traffic passage behind the abutment during the construction of the main beam 6.

[0039] 2. Since the back wall section 5.1 can be poured first without waiting for the main beam 6 to be constructed first, the construction period is shortened and the overall economic benefits of the project are improved.

[0040] 3. The reserved gap 8 between the back wall and the main beam solves the problem of the operating space required for the prestressing tensioning of the main beam 6, making construction more convenient;

[0041] 4. The reserved gap 8 between the back wall and the main beam and the manhole 6.1 at the end of the main beam facilitate the entry of maintenance personnel into the interior of the main beam 6, making maintenance convenient.

[0042] It should be noted that the above description of the technical solutions is exemplary, and this specification may be embodied in different forms and should not be construed as limiting it to the technical solutions set forth herein. Rather, providing these descriptions will ensure that the disclosure of this utility model is thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. Furthermore, the technical solutions of this utility model are defined only by the scope of the claims.

[0043] For those skilled in the art to which this utility model pertains, several simple deductions or substitutions can be made without departing from the concept of this utility model, and the above structures should all be considered to fall within the protection scope of this utility model.

Claims

1. A bridge abutment structure, comprising: The bridge abutment foundation (1) is characterized in that: the bridge abutment foundation (1) is provided with a platform body (2) and a side wall (4) on the top, the platform body (2) and the side wall (4) are connected by casting integrally, the platform body (2) is provided with a cap (3) and a back wall (5) on the top, and the cap (3) is provided with a bridge abutment and main beam support (7) for supporting the main beam (6). The back wall (5) includes a pre-cast section (5.1) and a post-cast section (5.2) for retaining soil. The pre-cast section (5.1) is integrally connected to the platform (2) and the side wall (4) by casting. The post-cast section (5.2) is integrally connected to the pre-cast section (5.1) and the platform (2) by casting.

2. The bridge abutment structure according to claim 1, characterized in that: A horizontal connecting steel bar (9) is provided between the pre-cast section (5.1) and the post-cast section (5.2) of the back wall.

3. The bridge abutment structure according to claim 1, characterized in that: Vertical connecting steel bars (10) are provided between the post-cast section (5.2) of the back wall and the platform (2).

4. The bridge abutment structure according to claim 1, characterized in that: A gap (8) is provided between the back wall (5) and the main beam (6) for people to pass through.

5. A bridge abutment structure according to claim 4, characterized in that: The upper end of the back wall post-cast section (5.2) is provided with a back wall post-cast section cantilever (5.2.1).

6. The bridge abutment structure according to claim 1, characterized in that: The main beam (6) is provided with a manhole (6.1) at the end of the main beam for personnel to enter.

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