New and old concrete connecting structure for bridge pier column

Abstract

The utility model relates to the technical field of bridge connection, in particular to a bridge pier stud new and old concrete connection structure. Comprising a bearing platform and a stand column arranged on the bearing platform, and further comprises a pile casing arranged on the periphery of the stand column, and the pile casing comprises shear ribs arranged on the periphery of the stand column and connected with the concrete face of the stand column, connecting ribs welded to main ribs of the stand column and concrete poured on the shear ribs and the connecting ribs; newly added main reinforcements are arranged on the outer sides of the connecting reinforcements and the shear reinforcements; the connecting ribs, the shear ribs and the newly-added main ribs are connected and arranged in a net shape. The new and old concrete connecting structure of the bridge pier column has the advantages of being good in reinforcing effect, high in durability, low in cost, convenient to construct and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of bridge connection, in particular to a connection structure between new and old concrete of a bridge pier column. Background Technique

[0002] For bridge maintenance and reinforcement, various aspects need to be considered. The maintenance and reinforcement design scheme must combine theory with practice, be based on scientific detection data, use refined design as the means, and professional construction as the auxiliary to finally repair the damaged components. Since there are few reference materials for current maintenance and reinforcement in China, the relevant calculation theories are still immature, and many current technical means are still in the exploratory stage. For example: during the maintenance, reinforcement and transformation of bridge pier columns, the connection problem between new and old concrete is often involved. Whether the connection between new and old concrete is firm or not directly affects the stability and service life of the entire structure. The conventional reinforcement scheme is to wrap a layer of reinforced concrete on the surface of the existing structure. Due to different concrete ages and shrinkage and creep effects, the connection between new and old concrete is not close enough, and the main reinforcement bars in the old concrete and the main reinforcement bars in the newly poured part of the concrete cannot work together. In addition, the volume of the outer wrapped concrete is not large, the space inside the formwork is narrow, and the conventional concrete cannot be vibrated, so the construction quality cannot be guaranteed. Therefore, it is very important to select a suitable connection method for new and old concrete.

[0003] Chinese Patent CN207277176U discloses a connecting device for precast assembled bridge piers, including a pier bottom connecting device at the bottom of the precast bridge pier and a cap connecting embedded device at the top of the cast-in-place cap. The precast bridge pier and the cast-in-place cap are connected and fixed through the up-and-down cooperation and installation of the pier bottom connecting device and the cap connecting embedded device. The utility model adopts a precast assembled bridge pier with a connection form of steel plate outer wrapping + U ribs + precision rolled threaded steel, and the construction process is simple and convenient. Compared with other forms, the on-site construction procedures are less, greatly improving the construction efficiency and effectively guaranteeing the construction quality; the safety and reliability are high, and it can be applied to areas with higher seismic intensities; the connection structure has a certain anti-collision protection function for the main body of the bridge pier and can be widely promoted in urban bridges.

[0004] However, this technical solution is only applicable to the connection part between the bridge pier and the cap, not applicable to the reinforcement of the column, with poor stability, insufficient durability and inconvenient use. Content of the Utility Model

[0005] The purpose of the utility model is to provide a connection structure between new and old concrete of a bridge pier column for the deficiencies of the prior art. Through the shear reinforcement connected to the concrete surface of the column and the connecting reinforcement welded to the main reinforcement bars of the column, and then formed by concrete pouring, the function of making the column more stable and firm is realized, and the problem of insufficient durability of the column in the prior art is solved.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A connection structure between new and old concrete of a bridge pier column, comprising: a bearing platform and a column arranged on the bearing platform, further comprising: a casing arranged on the outer periphery of the column, the casing comprising: shear reinforcement arranged on the outer periphery of the column and in contact with the concrete surface of the column, connecting reinforcement welded to the main reinforcement of the column, and concrete poured on the shear reinforcement and the connecting reinforcement, additional main reinforcement being arranged on the outer sides of the connecting reinforcement and the shear reinforcement, and the connecting reinforcement, the shear reinforcement and the additional main reinforcement being connected to each other and arranged in a mesh pattern.

[0008] Preferably, the connecting reinforcement and the shear reinforcement are arranged in a staggered manner.

[0009] Preferably, anchor bars are arranged between the shear reinforcement and the concrete surface.

[0010] Preferably, the shear reinforcement is in an inverted 7 - shape.

[0011] Preferably, the connecting reinforcement is in a π - shape.

[0012] Preferably, the casing is formed by pouring C40 self - flowing vibration - free micro - expanding concrete.

[0013] Preferably, a steel protective layer is arranged on the outer side of the additional main reinforcement.

[0014] Preferably, a number of reserved concrete pouring openings are arranged on the outer side of the casing.

[0015] The beneficial effects of the present utility model are as follows:

[0016] (1) By using C40 self - flowing vibration - free micro - expanding concrete for pouring and forming, the present utility model solves the problem that concrete cannot be vibrated due to the narrow space inside the formwork. Since the vibration amplitude of this kind of concrete is large, the concrete is more uniform, can be better poured with the connecting reinforcement, the shear reinforcement and the additional main reinforcement, and there will be no problems such as gaps, ensuring the strength of the casing and thus extending the service life of the casing.

[0017] (2) In the present utility model, the connecting reinforcement, the shear reinforcement and the additional main reinforcement are connected to each other and arranged in a mesh pattern. The mesh pattern has a large stiffness, good elasticity, uniform and accurate spacing, and high - strength welding points, thus greatly improving the engineering quality, and can improve the seismic and crack - resistance performance, has good bond and anchorage performance with concrete, has uniform stress, and significantly improves the seismic and crack - resistance performance of the connection structure.

[0018] (3) By arranging a number of reserved concrete pouring openings on the outer side of the casing and pouring the concrete into the inside of the casing through the reserved concrete pouring openings, the flow rate of the concrete is increased, the pouring speed is accelerated, the work efficiency is improved, the construction is convenient, and the cost is low.

[0019] (4) By adopting the π-shaped connecting bars, the utility model can solve the problem that the main reinforcement bars of the column and the newly added main reinforcement bars cannot work together, enabling the force-bearing state of the casing and the column to be the same and ensuring the service life of the casing.

[0020] (5) By adopting the inverted 7-shaped shear bars, the utility model can ensure full connection and casting with the concrete, and can solve the problem that the connection between the new and old concretes, that is, between the column and the casing, is not tight enough.

[0021] In summary, the utility model has the advantages of good reinforcement effect, strong durability, low cost, and convenient construction. Description of the Drawings

[0022] Figure 1 is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 is a cross-sectional view of the utility model;

[0024] Figure 3 is an installation schematic diagram of the connecting bars of the utility model;

[0025] Figure 4 is an installation schematic diagram of the shear bars of the utility model.

[0026] Reference numerals: 1 - bearing platform; 2 - column; 21 - concrete surface; 22 - main reinforcement bar; 3 - casing; 31 - shear bar; 32 - connecting bar; 33 - concrete; 34 - newly added main reinforcement bar; 35 - implanted bar; 36 - steel protection layer; 37 - reserved concrete pouring port. Detailed Embodiment

[0027] Next, the technical solutions in the embodiments of the utility model will be clearly and completely described in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the utility model.

[0028] In the description of the utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the utility model.

[0029] In addition, the terms "first" and "second" are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present utility model, the meaning of "a plurality" is two or more, unless otherwise specifically defined.

[0030] Embodiment

[0031] As Figures 1-4 shown, this embodiment provides a connection structure between new and old concrete of a bridge pier column, including: a bearing platform 1 and a column 2 provided on the bearing platform 1, and further including: a casing 3 provided on the outer periphery of the column 2, the casing 3 including: shear reinforcement bars 31 provided on the outer periphery of the column 2 and in contact with the concrete surface 21 of the column 2, connecting reinforcement bars 32 welded to the main reinforcement bars 22 of the column 2, and concrete 33 poured on the shear reinforcement bars 31 and the connecting reinforcement bars 32. The acting connection parts of the shear reinforcement bars 31 and the connecting members with the column 2 are different, and the column 2 is reinforced from two aspects respectively, so that the casing 3 has good reinforcement effect and strong durability.

[0032] Wherein, new main reinforcement bars 34 are provided on the outer sides of the connecting reinforcement bars 32 and the shear reinforcement bars 31. The new main reinforcement bars 34 mainly bear tensile stress in the concrete 33 and have a large bonding ability with the concrete 33, so they can better bear the action of external forces.

[0033] At the same time, the connecting reinforcement bars 32, the shear reinforcement bars 31 and the new main reinforcement bars 34 are connected to form a mesh arrangement. The mesh arrangement has large stiffness, good elasticity, uniform and accurate spacing, and high strength of welding points, thus greatly improving the project quality, and can improve the seismic and crack resistance performance. It has good bonding and anchoring performance with the concrete 33, and the stress is uniform, significantly improving the seismic cracking performance of the connection structure.

[0034] In this embodiment, the connecting reinforcement bars 32 and the shear reinforcement bars 31 are arranged in a staggered manner, that is, they do not interfere with each other and are arranged at intervals in turn. The combination of the two makes the structure of the column 2 more stable and firm. With the pouring of the concrete 33, the casing 3 has good reinforcement effect, thus ensuring the strength of the entire bridge pier column.

[0035] In this embodiment, planting bars 35 are provided between the shear reinforcement bars 31 and the concrete surface 21 of the column 2. That is, after roughening the concrete surface 21 of the column 2, the shear reinforcement bars 31 are implanted by the process of planting bars 35, ensuring the connection strength between the column 2 and the casing 3, and thus making the two more stable and firm.

[0036] In this embodiment, the shear reinforcement 31 is in an inverted L shape, which can ensure sufficient connection and casting with the concrete 33 to form a molded body, and can solve the problem of insufficient tight connection between the old and new concretes 33, that is, between the column 2 and the casing 3.

[0037] In this embodiment, the connecting reinforcement 32 is in a π shape, which can solve the problem that the main reinforcement 22 of the column 2 and the newly added main reinforcement 34 cannot cooperate in force, so that the casing 3 and the column 2 are in the same stress state, and the service life of the casing 3 is ensured.

[0038] In this embodiment, the concrete 33 is cast and formed by using C40 self-leveling vibration-free and slightly expanding concrete 33 to solve the problem that the concrete 33 cannot be vibrated due to the narrow space inside the formwork. Since the vibration amplitude of this kind of concrete 33 is large, the concrete 33 is more uniform, and it can be better cast with the connecting reinforcement 32, the shear reinforcement 31 and the newly added main reinforcement 34 without problems such as gaps, ensuring the strength of the casing 3 and thus extending the service life of the casing 3.

[0039] Certainly, a steel protective layer 36 is arranged on the outer side of the newly added main reinforcement 34 to protect the newly added main reinforcement 34 and the shear reinforcement 31, ensure their quality, make the casting of the concrete 33 more firm and stable, and the construction is also convenient.

[0040] In addition, a plurality of reserved concrete pouring openings 37 are arranged on the outer side of the casing 3, and the concrete 33 is poured into the inside of the casing 3 through the reserved concrete pouring openings 37, increasing the flow rate of the concrete 33, accelerating the pouring speed, improving the work efficiency, being convenient for construction and having low cost.

[0041] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A connecting structure for new and old concrete of a bridge pier column, comprising: A bearing platform and columns arranged on the bearing platform, characterized in that it further comprises: a casing arranged on the outer periphery of the column, and the casing includes: shear reinforcement arranged on the outer periphery of the column and connected to the concrete surface of the column, connecting reinforcement welded to the main reinforcement of the column, and concrete poured on the shear reinforcement and the connecting reinforcement. Additional main reinforcement is arranged on the outer sides of the connecting reinforcement and the shear reinforcement, and the connecting reinforcement, the shear reinforcement, and the additional main reinforcement are connected to form a mesh arrangement.

2. The new-old concrete connection structure of a bridge pier column according to claim 1, characterized in that, The connecting reinforcement and the shear reinforcement are arranged in a staggered manner.

3. The new-old concrete connection structure of a bridge pier column according to claim 1, characterized in that, Anchor bars are arranged between the shear reinforcement and the concrete surface.

4. A connection structure between new and old concrete of a bridge pier column according to claim 1, characterized in that, The shear reinforcement is in an inverted 7 - shaped form.

5. A connection structure between new and old concrete of a bridge pier column according to claim 1, characterized in that The connecting reinforcement is in a π - shaped form.

6. A connection structure between new and old concrete of a bridge pier column according to claim 1, characterized in that The casing is formed by pouring C40 self - flowing vibration - free micro - expansive concrete.

7. A connecting structure for new and old concrete of a bridge pier column according to claim 1, characterized in that, A steel protection layer is arranged on the outer side of the additional main reinforcement.

8. A connection structure between new and old concrete of a bridge pier column according to claim 1, characterized in that, A number of reserved concrete pouring openings are arranged on the outer side of the casing.

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