Bridge pier column reinforcing structure

Abstract

The utility model discloses a bridge pier column reinforcing structure, and belongs to the technical field of bridge reinforcing. The steel casing is arranged on the outer side of the bridge pier, so that the pouring cavity is formed between the steel casing and the bridge pier, and pouring is convenient; pouring is conducted in a pressurized pouring mode, and the phenomenon of pouring hollowing of the poured pier is avoided; connecting structures are arranged at the two ends of the steel casing, so that the steel plate is prevented from slipping in the pouring process; by arranging the stiffening ribs, the radial compressive strength of the steel casing in the pouring process is guaranteed; by implanting the steel bars, it is ensured that the steel pile casing and the original structure form a jointly-stressed whole, and the overall performance of the reinforced structure is improved; due to the arrangement of the steel casing and the stiffening ribs, enough strength and rigidity are provided, and the construction requirement of pressure grouting is met; the steel protection cylinder is formed by splicing the semicircular shells, the splicing positions are connected in a welding mode, the steel protection sections are spliced in the length direction, splicing is conducted in a mortise and tenon joint mode, and the construction efficiency is improved.

Description

Technical Field

[0001] This utility model belongs to the field of bridge reinforcement technology, specifically relating to a bridge pier reinforcement structure. Background Technology

[0002] Over time, many early-built bridges experience a decline in structural performance due to long-term use. Furthermore, bridges exposed to sudden events such as fires or explosions suffer severe damage to their structural integrity, leading to various bridge defects. Replacing piers or foundation piles during bridge repair is not only a massive undertaking but also requires substantial resources. For bridges with minor damage, reinforcement measures are a more economical and effective solution, ensuring bridge safety while effectively controlling maintenance costs.

[0003] Existing bridge reinforcement techniques typically involve increasing the cross-section of the piers to strengthen older bridge piers. This involves installing reinforcing steel plates around the pier, creating cavities between the plates and the pier. Then, grout of a specific strength is injected from above to complete the reinforcement. However, due to the large volume of the piers, voids may form in the grout during its descent. To address this issue, pressure grouting technology is currently used to inject the grout, effectively preventing voids. However, this method places higher demands on the strength of the reinforced structure, and existing reinforcement structures may not meet the requirements of pressure grouting construction.

[0004] Meanwhile, existing bridge reinforcement technologies only use steel casings to reinforce bridge piers. Since the steel casings are not connected to the foundation and cap beams, the reinforcement effect of the steel casings is effective, but they cannot effectively improve the overall stress performance of the structure.

[0005] In summary, the existing reinforcement structures cannot meet the construction strength requirements of pressure grouting. Utility Model Content

[0006] The technical problem to be solved by this utility model is to provide a bridge pier reinforcement structure that addresses the shortcomings of the prior art. The structure is novel and reasonable, stable, and highly adaptable.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] A bridge pier reinforcement structure includes a bridge pier pile foundation, a bridge pier, and a cap beam. A steel casing is installed on the outside of the bridge pier, and the two ends of the steel casing are connected to the bridge pier pile foundation and the cap beam respectively through connecting structures. A cast-in-place cavity is formed between the steel casing and the bridge pier.

[0009] The connection structure includes embedded reinforcing bars and stiffening ribs for welding with the steel casing. The stiffening ribs are perpendicular to the surface of the bridge pier pile foundation and are evenly distributed around the steel casing. Part of the embedded reinforcing bars are welded and fixedly connected to the side of the stiffening ribs, and the other part is inserted into the corresponding bridge pier pile foundation and cap beam for fixed connection.

[0010] The steel casing is assembled from semi-circular shells, and the joints are connected by welding; the steel casing is assembled from several steel sections along its length, and the joints are connected by mortise and tenon joints.

[0011] A casting hole is provided at the bottom of the steel casing, and epoxy mortar is poured into the casting cavity by pressure casting.

[0012] Furthermore, a connecting plate and connecting bolts extend outward from the outer side of the steel casing section splice; the connecting plate has connecting holes parallel to the length direction of the steel casing, and the connecting bolts pass through the connecting holes to achieve a fixed connection between two adjacent steel casing sections.

[0013] Furthermore, a limiting protrusion is provided inside the steel casing to maintain the casting cavity during the pouring process.

[0014] Furthermore, the inserted reinforcing bars and stiffening ribs are fixed by double-sided welding.

[0015] Furthermore, a sealing strip is installed between the steel casing and the bridge pier pile foundation.

[0016] Furthermore, submerged arc welding is used as the welding method.

[0017] Furthermore, ground tie beams are also installed on the outside of the bridge pier pile foundations.

[0018] Furthermore, structural steel reinforcement is installed inside the cast cavity.

[0019] This utility model has the following advantages compared with the prior art:

[0020] The bridge pier reinforcement structure of this utility model creates a casting cavity between the steel casing and the bridge pier by setting a steel casing on the outside of the bridge pier, which facilitates the casting of epoxy mortar. By using a pressurized casting method, the casting of the bridge pier is prevented from becoming hollow after casting, which further improves the strength of the reinforced bridge pier. By setting a connecting structure at both ends of the steel casing, the slippage of the steel casing during the casting process is ensured. This connection structure, through the addition of stiffening ribs, ensures the radial compressive strength of the steel casing during casting. The embedded reinforcing bars ensure effective connection between the steel casing and the pier pile foundation and the cap beam. The design of the steel casing and the arrangement of the stiffening ribs provide sufficient strength and rigidity to meet the construction requirements of pressure grouting. The steel casing is composed of semi-circular shells spliced ​​together, with welded joints. Along its length, several steel sections are spliced ​​together using mortise and tenon joints, simplifying the construction process and improving efficiency. Furthermore, the use of epoxy mortar not only fills the gap between the steel casing and the pier but also enhances the structure's durability due to its high adhesion and shrinkage compensation properties. This solves the problem that existing reinforcement structures cannot meet the strength requirements of pressure grouting. Through the connection between the steel casing and the foundation and cap beam, the force on the steel casing can be effectively transferred to the foundation and cap beam, effectively improving the overall structural load-bearing capacity. The stiffening ribs and rebar connections further enhance the overall reinforcement effect.

[0021] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0022] Figure 1 This is a front view schematic diagram of an embodiment of the bridge pier reinforcement structure of this utility model;

[0023] Figure 2 for Figure 1 AA section diagram;

[0024] Figure 3 This is a top view of the steel casing of an embodiment of the bridge pier reinforcement structure of this utility model;

[0025] Figure 4 This is a partial structural diagram of the steel retaining section connection in an embodiment of the bridge pier reinforcement structure of this utility model;

[0026] Explanation of reference numerals in the attached figures:

[0027] 1. Bridge pier pile foundation; 2. Bridge pier; 3. Cap beam;

[0028] 4. Steel casing; 41. Semi-circular shell; 42. Steel protective section; 43. Limiting protrusion; 44. Connecting plate; 45. Connecting hole; 46. Connecting bolt;

[0029] 5. Connecting structure; 51. Reinforcing steel bars; 52. Stiffening ribs;

[0030] 6. Casting the cavity; 7. Sealing strip; 8. Ground beam. Detailed Implementation

[0031] Example of bridge pier reinforcement structure:

[0032] like Figure 1 As shown, the pier reinforcement structure includes a pier pile foundation 1, a pier 2, and a cap beam 3. The lower end of the pier 2 is fixedly connected to the pier pile foundation 1, and the upper end of the pier 2 is fixedly connected to the cap beam 3. To reinforce the pier 2, a steel casing 4 is installed on the outside of the pier 2. The two ends of the steel casing 4 are connected to the pier pile foundation 1 and the cap beam 3 respectively through a connecting structure 5. A casting cavity 6 is formed between the steel casing 4 and the pier 2 to facilitate the casting of materials.

[0033] To enhance the stability of the steel casing 4, the connection structure 5 includes embedded reinforcing bars 51 and stiffening ribs 52 for welding to the steel casing 4. The stiffening ribs 52 are perpendicular to the surface of the bridge pier pile foundation and evenly distributed around the steel casing 4. Part of the embedded reinforcing bars 51 are welded and fixedly connected to the side of the stiffening ribs 52, while the other part is inserted into the corresponding pier pile foundation 1 and cap beam 3 for fixed connection. That is, the steel casing 4 is connected to the pier pile foundation 1 and cap beam 3 through the stiffening ribs 52 and the embedded reinforcing bars 51. Furthermore, this connection method can adapt to different pier structures and construction environments, exhibiting good versatility. This design ensures that the connection between the embedded reinforcing bars 51 and the stiffening ribs 52, the pier pile foundation 1, and the cap beam 3 is both firm and stable, enhancing the overall structural stability and load-bearing capacity.

[0034] To ensure the strength of the connection structure 5 itself, the reinforcing steel bar 51 and the stiffening rib 52 are fixed by double-sided welding. Double-sided welding provides a more uniform stress distribution and can withstand greater tensile and shear forces compared with single-sided welding, thereby improving the connection strength between the reinforcing steel bar and the stiffening rib 52.

[0035] To facilitate the transportation and construction of steel casing 4, such as Figures 2-4 As shown, the steel casing 4 is composed of semi-circular shells 41 joined together by welding. The steel casing 4 is also composed of several steel sections 42 joined together along its length, with the joints connected by mortise and tenon joints. The installation of the steel casing 4 is relatively simple, allowing for quick reinforcement. The mortise and tenon joints limit the radial movement of the semi-circular shell 41 after the steel sections 42 are connected, preventing the joined semi-circular shell 41 from wobbling freely in the radial direction.

[0036] Furthermore, a connecting plate 44 and a connecting bolt 46 extend outward from the outer side of the splicing joint of the steel protective section 42. A connecting hole 45 is provided on the connecting plate 44 parallel to the length direction of the steel casing 4, and the connecting bolt 46 passes through the connecting hole 45 to achieve a fixed connection between adjacent steel protective sections 42. The cooperation of the connecting plate 44 and the connecting bolt 46 restricts the length of the semi-circular shell 41 after the steel protective sections 42 are connected, meaning the spliced ​​semi-circular shell 41 cannot move freely in the length direction. Even without the connecting plate 44 and the connecting bolt 46, the mass of the steel protective section 42 itself can also limit the length of the spliced ​​semi-circular shell 41.

[0037] To prevent voids after pouring, a pouring hole is provided at the bottom of the steel casing 4. Epoxy mortar is poured into the pouring cavity 6 by pressurized pouring to enhance the strength of the reinforced pier 2.

[0038] To ensure the shape of the casting cavity 6, a limiting protrusion 43 is provided inside the steel casing 4 to maintain the casting cavity 6 during the casting process. The limiting protrusion 43 ensures that the casting cavity 6 formed between the steel casing 4 and the pier 2 remains stable during the casting process, preventing the casting material from deviating from the predetermined position. By maintaining the shape and size of the casting cavity 6, the limiting protrusion 43 helps to improve the quality of the cast epoxy mortar, ensures the uniform distribution of the reinforcement material, and enhances the overall integrity of the structure.

[0039] To further enhance the strength of the reinforcement, structural steel bars are installed inside the cast-in-place cavity 6. By adding steel bars to the cast-in-place cavity 6, the load-bearing capacity and crack resistance of the pier 2 can be further improved.

[0040] To ensure the strength of the pressure casting, a sealing strip 7 is installed between the steel casing 4 and the pier pile foundation 1.

[0041] The welding method employed is submerged arc welding, which minimizes damage to the steel casing 4 during the welding process and results in a strong weld. Alternatively, CO2 shielded welding can also be used.

[0042] With the reinforcement of pier 2, the corresponding pier pile foundation 1 also needs to be reinforced accordingly. For this purpose, a ground beam 8 is also installed on the outside of the pier pile foundation 1. By installing the ground beam 8, the lateral stability of pier 2 is increased, so that the pier pile foundation 2 as a whole can bear the superstructure load.

[0043] The above description is merely a preferred embodiment of the present utility model and does not constitute any limitation on the present utility model. Any simple modifications, alterations, or equivalent structural changes made to the above embodiments based on the technical essence of the present utility model shall still fall within the protection scope of the present utility model.

Claims

1. A bridge pier reinforcement structure, comprising a bridge pier pile foundation (1), a bridge pier (2), and a cap beam (3), characterized in that: A steel casing (4) is installed on the outside of the pier (2). The two ends of the steel casing (4) are connected to the pier pile foundation (1) and the cap beam (3) respectively through the connecting structure (5). A casting cavity (6) is formed between the steel casing (4) and the pier (2). The connection structure (5) includes an embedded steel bar (51) and a stiffening rib (52) for welding with the steel casing (4). The stiffening rib (52) is perpendicular to the surface of the bridge pile foundation and is evenly distributed around the steel casing (4). Part of the embedded steel bar (51) is welded and fixedly connected to the side of the stiffening rib (52), and the other part is inserted into the corresponding bridge pier pile foundation (1) and cap beam (3) for fixed connection. The steel casing (4) is made of a semi-circular shell (41) spliced ​​together, and the splice is connected by welding; the steel casing (4) is made of several steel casing segments (42) spliced ​​together along the length direction, and the splice is spliced ​​by tenon and mortise connection. A casting hole is provided below the steel casing (4), and epoxy mortar is poured into the casting cavity (6) by pressure casting.

2. The bridge pier reinforcement structure according to claim 1, characterized in that: A connecting plate (44) and a connecting bolt (46) extend outward from the outer side of the splice of the steel guard section (42); a connecting hole (45) is provided on the connecting plate (44) parallel to the length direction of the steel guard cylinder (4), and the connecting bolt (46) passes through the connecting hole (45) to realize the fixed connection of two adjacent steel guard sections (42).

3. A bridge pier reinforcement structure according to claim 1, characterized in that: The steel casing (4) is provided with a limiting protrusion (43) to maintain the casting cavity (6) during the casting process.

4. A bridge pier reinforcement structure according to claim 1, characterized in that: The implanted reinforcing bar (51) and stiffening rib (52) are fixed by double-sided welding.

5. A bridge pier reinforcement structure according to claim 1, characterized in that: A sealing strip (7) is provided between the steel casing (4) and the pier pile foundation (1).

6. A bridge pier reinforcement structure according to claim 1, characterized in that: The welding method used is submerged arc automatic welding.

7. A bridge pier reinforcement structure according to claim 1, characterized in that: A ground beam (8) is also provided on the outside of the pier pile foundation (1).

8. A bridge pier reinforcement structure according to claim 1, characterized in that: Structural steel bars are installed inside the cast cavity (6).

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