Cover beam lengthening transformation structure for bridge deck widening

Abstract

The utility model relates to the field of bridge reconstruction and expansion in bridge engineering, in particular to a bent cap lengthening transformation structure for bridge floor widening. The problem that the length and the bearing capacity of the bent cap are insufficient when the bridge deck is widened is solved. The bent cap transformation structure is lengthened based on an original bridge system and comprises a bent cap lengthening system, and the bent cap lengthening system is fixed to the end of a bent cap of the original bridge system. Symmetrical bent cap inclined struts are arranged by taking an original pier column as a fulcrum to optimize a stress system, T-shaped flanges are arranged on an original bent cap and a lengthened part of the bent cap, and a full-length prestressed steel beam is additionally arranged to meet the requirement of the bearing capacity of the bent cap, so that the aim of lengthening and transforming the bent cap is fulfilled.

Description

Technical Field

[0001] The utility model relates to the field of bridge reconstruction and expansion in bridge engineering, and specifically relates to a bent cap lengthening and transforming structure for bridge deck widening. Background Technique

[0002] With the increasing traffic volume, some roads built in the early stage have reached or exceeded the original design traffic capacity, resulting in problems such as insufficient traffic capacity and declining service level. The economic cost of bridge engineering is relatively high. Widening the bridge deck by using the existing bridge can reduce the project investment and the impact on traffic. However, the pier bent cap is restricted by the original design structural dimensions and bearing capacity, becoming a controlling factor in the bridge reconstruction and expansion project.

[0003] However, in the traditional design of bent cap widening and transformation, the main methods are to add pile foundations on both sides of the original pier, set independent bent caps, or adopt the scheme of increasing the cross-section of both the bent cap and the pier at the same time. The scheme of adding pile foundations on both sides of the original pier and setting independent bent caps has a high cost and cannot be implemented when the space under the bridge is limited; the scheme of increasing the cross-section of both the bent cap and the pier at the same time greatly increases the structural self-weight, requires a large amount of steel bars to be implanted in the original structure, and the construction process is complex and not beautiful. Content of the Utility Model

[0004] The utility model provides a bent cap lengthening and transforming structure for bridge deck widening, which effectively solves the problems of insufficient bent cap length and bearing capacity during bridge deck widening, and can make up for the defects of high cost, occupying the space under the bridge, large self-weight, complex construction process and not beautiful appearance in the traditional bent cap lengthening and transforming scheme. The bent cap transformation structure for bridge deck widening in this application increases the cross-section of the original bent cap to achieve bent cap lengthening, sets symmetrical bent cap diagonal braces with the original pier column as the fulcrum to optimize the force system, sets flanges between the original bent cap and the lengthened part of the bent cap, and tension the full-length prestressed steel bundles to meet the requirements of the bending bearing capacity and crack resistance of the bent cap, so as to achieve the purpose of bent cap lengthening and transformation.

[0005] The technical solution of the utility model is specifically as follows:

[0006] A bent cap lengthening and transforming structure for bridge deck widening, the bent cap transformation structure is lengthened based on the original bridge system, and the bent cap transformation structure includes:

[0007] A bent cap lengthening system, which is fixed at the end of the original bridge bent cap of the original bridge system;

[0008] A bent cap lengthening support assembly, which supports the bent cap lengthening system by fixing with the original pier column of the original bridge system;

[0009] Among them, the bent cap lengthening system includes:

[0010] The extended section of the capping beam, which is connected to the original capping beam of the bridge, and a cast-in-place section for capping beam chiseling is formed at the connection.

[0011] The end support platform is cast on the extended section of the capping beam.

[0012] Among them, the extended capping beam support assembly includes:

[0013] The pier anchor, which is fixed on the original pier column of the original bridge system.

[0014] The outer diagonal brace, one end of which is fixed on the pier anchor and the other end is fixed on the end support platform.

[0015] Furthermore, the extended capping beam system further includes:

[0016] The main reinforcement bars for the extended section are cast in the extended section of the capping beam and are welded to the original main reinforcement bars of the original bridge system.

[0017] Furthermore, support embedded parts are pre-cast in the end support platform, and the end support platform is connected to the outer diagonal brace through the support embedded parts.

[0018] Furthermore, the extended capping beam support assembly further includes:

[0019] The inner diagonal brace, one end of which is fixed on the pier anchor and the other end is provided with a capping beam anchor. The capping beam anchor is fixed to the original capping beam of the original bridge system through anchor bolts.

[0020] Furthermore, the capping beam reconstruction structure further includes:

[0021] The capping beam flange is cast on the extended section of the capping beam of the connected extended capping beam system and the original capping beam of the original bridge system.

[0022] Furthermore, prestressed steel tendons are arranged in the capping beam flange, and the prestressed steel tendons are tensioned after the concrete strength of the capping beam flange reaches the required value.

[0023] The beneficial effects of the present utility model are as follows: First, the self-weight of the structure is light. Compared with the traditional reconstruction scheme, the self-weight load is reduced.

[0024] Second, the force of the structure is clear. The original pier column is fully utilized and combined with the steel pipe diagonal braces, reducing the load effect of the original capping beam of the bridge.

[0025] Third, by setting the steel pipe diagonal braces, the construction of new piers and land occupation are avoided, and the land occupation cost can be reduced.

[0026] Fourth, the material characteristics of the steel structure and prestressed steel tendons are fully utilized to achieve the purpose of capping beam reconstruction. The construction process is simple and the project investment is relatively low.

[0027] In summary, the lengthening and transformation structure of the bent cap for bridge deck widening in this application has high construction efficiency and low capital investment, enabling the structure to have good mechanical properties and certain economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic diagram of the bent cap structure of the present utility model Figure 1 ;

[0029] Figure 2 is a schematic diagram of the bent cap structure of the present utility model Figure 2 ;

[0030] Figure 3 is a sectional view of the bent cap structure of the present utility model;

[0031] As shown in the figure: original bridge system 100, original bridge bent cap 110, original bridge pier column 120, original bridge main reinforcement 130, bent cap lengthening system 200, bent cap lengthening section 210, lengthening section main reinforcement 220, end support platform 230, support embedded part 240, bent cap lengthening support assembly 300, bridge pier anchor 310, outer diagonal support 320, inner diagonal support 330, bent cap anchor 340, anchor bolt 350, bent cap chiseled and cast-in-place section 400, bent cap flange 500, prestressed steel bundle 600. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] The technical solutions of the present utility model will be further described below with reference to the drawings and through specific embodiments:

[0033] Embodiment 1

[0034] Referring to the attached Figures 1 to 3 , the present utility model is a lengthening and transformation structure of a bent cap for bridge deck widening. This structure is lengthened based on the original bridge system 100 to meet the increasing traffic flow and the expanding demand for the bridge deck width. The transformation structure mainly includes a bent cap lengthening system 200, a bent cap lengthening support assembly 300, a bent cap flange 500, and a prestressed steel bundle 600.

[0035] The structure of the bent cap lengthening system 200 is as shown in Figure 1 , 2As shown in FIGS. 2 and 3, it is prefabricated in the factory and its components include: the extended capping beam section 210, the main reinforcement bars of the extended section 220, the end support platform 230, and the support embedded parts 240. The capping beam extension system 200 is fixed to the end of the original capping beam 110 of the original bridge system 100. First, a part of the length of the original capping beam 110 is chiseled off, and the original main reinforcement bars 130 of the original bridge are retained. The main reinforcement bars 220 of the extended capping beam section 210 are cast in the extended capping beam section 210 and are welded to the original main reinforcement bars 130 of the original bridge system 100 to ensure the continuity and bearing capacity of the structure. After the main reinforcement bars 220 of the extended section are welded to the original main reinforcement bars 130 of the original bridge, concrete is cast between the extended capping beam section 210 and the original capping beam 110 of the original bridge to form the cast-in-place section 400 of the chiseled capping beam. An end support platform 230 is cast at one side end of the bottom of the extended capping beam section 210, and support embedded parts 240 are arranged inside it.

[0036] The structure of the capping beam extension support assembly 300 is as shown in Figure 1 , 2 and 3. It is prefabricated in the factory and its components include: the pier anchor 310, the outer diagonal support 320, the inner diagonal support 330, the capping beam anchor 340, and the anchor bolts 350. First, one ends of the outer diagonal support 320 and the inner diagonal support 330 are respectively welded and fixed to the pier anchor 310, and the pier anchor 310 is fixed to the original pier column 120 of the original bridge system 100 through the anchor bolts 350. The other end of the outer diagonal support 320 is welded and fixed to the support embedded part 240 of the capping beam extension system 200. The other end of the inner diagonal support 330 is provided with a capping beam anchor 340, and the capping beam anchor 340 is fixed to the original capping beam 110 of the original bridge system 100 by using the anchor bolts 350.

[0037] The capping beam flange 500 is cast on the extended capping beam section 210 of the connected capping beam extension system 200 and the original capping beam 110 of the original bridge system 100 to form a unified bridge deck structure. Prestressed steel tendons 600 are arranged in the capping beam flange 500. After the concrete strength of the capping beam flange 500 reaches the design requirements, the prestressed steel tendons 600 are tensioned to improve the bearing capacity and durability of the capping beam flange.

[0038] The specific construction method is as follows:

[0039] Determine the dimensions of the extended section 210 of the capping beam according to the widened dimensions of the bridge deck and the dimensions of the main beam. Determine the vertical position of the pier anchor 310, and the angles between the outer diagonal support 320, the inner diagonal support 330 and the original pier column 120 according to the structural stress conditions. The capping beam extension system 200 is a factory-fabricated component. When installing the pier anchor 310 and the capping beam anchor 340, care should be taken to prevent damage to the main reinforcement bars of the original pier column 120 and the original capping beam 110 when installing the anchor bolts 350. When chiseling the concrete in the cast-in-situ section 400 of the original capping beam 110, the original main reinforcement bars 130 of the original capping beam 110 should be protected and connected to the extended main reinforcement bars 220 of the extended section 210 of the capping beam. When pouring the extended section 210 of the capping beam, support embedded parts 240 are pre-embedded in the end support 230. The outer diagonal support 320 is connected to the extended section 210 of the capping beam and the pier anchor 310, and the inner diagonal support 330 is connected to the capping beam anchor 340 and the pier anchor 310. After the concrete strength of the extended section 210 of the capping beam and the capping beam flange 500 reaches the design strength, the prestressed steel tendons 600 are tensioned.

[0040] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above-described exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, it is intended to embrace all changes that fall within the meaning and scope of the equivalent elements of the claims in the present utility model.

[0041] In addition, it should be understood that although this specification is described according to embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A cap beam lengthening and reconstruction structure for widening a bridge deck, wherein the cap beam lengthening and reconstruction structure is lengthened based on the original bridge system, and is characterized in that: The cap beam lengthening and transformation structure comprises: A cap beam extension system, wherein the cap beam extension system is fixed to the end of the original bridge cap beam of the original bridge system; A cap beam extension support assembly, wherein the cap beam extension support assembly is fixed to the original bridge piers of the original bridge system to support the cap beam extension system; Among them, the cap beam extension system includes: An extended cap beam section, wherein the extended cap beam section is connected to the original bridge cap beam, and a cast-in-place section of the cap beam is formed at the connection; End support platform, which is cast on the extended section of the cap beam; Wherein, the cap beam extension support assembly comprises: A pier anchor, wherein the pier anchor is fixed to an original pier column of an original bridge system; An outer oblique support, one end of which is fixed on the pier anchor, and the other end is fixed on the end support platform.

2. The cap beam lengthening and reconstruction structure for bridge deck widening according to claim 1 is characterized in that: The cap beam lengthening system also includes: The extended section main reinforcement is cast in the extended section of the cap beam and is welded to the original bridge main reinforcement of the original bridge system.

3. The cap beam lengthening and reconstruction structure for bridge deck widening according to claim 2 is characterized in that: The end support platform is precast with support embedded parts, and the end support platform is connected to the outer oblique support through the support embedded parts.

4. The cap beam lengthening and reconstruction structure for bridge deck widening according to claim 1 is characterized in that: The cap beam extension support assembly also includes: An inner oblique support, one end of which is fixed on the bridge pier anchor, and the other end is provided with a cap beam anchor, and the cap beam anchor is fixed to the original bridge cap beam by anchor bolts.

5. A cap beam lengthening and reconstruction structure for widening a bridge deck according to any one of claims 1 to 4, characterized in that: The cap beam lengthening and transformation structure also includes: The cap beam flange is cast on the cap beam extension section of the connected cap beam extension system and the original bridge cap beam of the original bridge system.

6. The cap beam lengthening and reconstruction structure for widening a bridge deck according to claim 5, characterized in that: Prestressed steel strands are arranged in the cap beam flanges, and the prestressed steel strands are tensioned after the concrete strength of the cap beam flanges reaches the required level.

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