Independent pier column bridge reinforcing structure
By adding columnar and conical enlargements to the piers and fixing them with support beams and expansive concrete, the problem of tilting or overturning of independent pier bridges under heavy vehicle loads was solved, achieving a stable effect of multi-point support.
Patent Information
- Application Number
- CN202520659239.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-09
- Publication Date
- 2026-01-09
- Estimated Expiration
- 2035-04-09
AI Technical Summary
Independent pier bridges are prone to tilting or overturning under the influence of heavy vehicles, leading to safety hazards.
A columnar enlargement and a conical enlargement are added to the upper part of the pier, and support points are increased through support beams and additional supports to form a multi-point support structure. The stability is ensured by combining expansive concrete and pre-embedded bolts.
It effectively prevents bridge overturning, ensures bridge stability under heavy vehicle loads, and improves bridge safety and stability.
Smart Images
Figure CN223780727U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a bridge reinforcement structure for independent piers, and more specifically, to a bridge reinforcement structure for independent piers with additional support points added to the independent piers. Background Technology
[0002] With the continuous development and improvement of my country's transportation network, tunnels have been built over mountains and bridges over rivers, forming a vast transportation network. During the construction of urban elevated bridges, in order to minimize the occupation of ground space, some sections use independent piers to support the bridge span structure. Because the bridge span structure (usually a T-beam or box girder) is supported by only one independent pier, when there are many heavy vehicles traveling on one side of the bridge, it can cause the bridge span structure to tilt to one side, and in severe cases, it can lead to the bridge deck overturning, seriously threatening the lives and property of passing vehicles and people. Therefore, to address the problem of poor stability and easy overturning of existing independent pier bridges, many places are now gradually beginning to reinforce these bridges.
[0003] Currently, there are various methods for reinforcing bridges with independent piers, but their basic principles are the same: the upper part of the independent pier is enlarged, and new support points are added to the enlarged part. This means that the bridge structure is no longer supported by a single point, but by two or three support points after reinforcement. This allows the independent pier to provide support for the T-beam or box girder from more than two points, preventing lateral tilting or overturning when one side of the T-beam or box girder is subjected to a large load. Therefore, this utility model also proposes a highly robust reinforcement structure for bridges with independent piers. Summary of the Invention
[0004] In order to overcome the shortcomings of the above-mentioned technical problems, this utility model provides a bridge reinforcement structure with independent piers.
[0005] This utility model discloses an independent pier bridge reinforcement structure, comprising, from bottom to top, pile foundations, abutments, piers, and box girders. The abutments are fixed to the top of the pile foundations, the lower ends of the piers are fixed to the abutments, and the upper ends of the piers are fixed with supports for the box girders. The pile foundations and abutments are located below the ground. The structure is characterized by: a columnar enlargement is cast around the upper periphery of the pier; both sides of the upper surface of the columnar enlargement are fixed with outwardly inclined support beams; the upper ends of the support beams are fixed with additional supports for the bottom of the box girders; the columnar enlargement consists of upper concrete and radial reinforcing bars and annular stirrups cast in the upper concrete; the inner ends of the radial reinforcing bars are embedded in the pier; the annular stirrups are located around the pier and tied to the stirrups; and embedded bolts for fixing the support beams are pre-embedded in the columnar enlargement on both sides of the pier.
[0006] The independent pier bridge reinforcement structure of this utility model consists of a supporting beam composed of an inclined beam, a bottom plate, and a top plate. The bottom plate and the top plate fix the lower end and the upper end of the inclined beam, respectively. Both the bottom plate and the top plate are horizontal. The bottom plate has bolt holes through which the upper end of the pre-embedded bolts pass.
[0007] The independent pier bridge reinforcement structure of this utility model has a tapered expansion section below the columnar expansion section, which is thicker at the top and thinner at the bottom. The upper end of the tapered expansion section is fixedly connected to the lower end of the columnar expansion section. The tapered expansion section is composed of lower concrete and radial reinforcing bars and annular stirrups poured into the lower concrete. The annular stirrups are tied to the radial reinforcing bars, and the inner ends of the radial reinforcing bars are embedded in the pier column. The lower concrete is ordinary concrete.
[0008] The independent pier bridge reinforcement structure of this utility model has two semi-circular tie plates on the periphery of the column enlargement. The outer ends of the radial reinforcing bars in the column enlargement are welded to the semi-circular tie plates, and the upper concrete is expansive concrete.
[0009] The independent pier bridge reinforcement structure of this utility model has a cross-shaped cross section for the inclined beam, which is composed of a central plate and web plates fixed to both sides of the central plate.
[0010] The beneficial effects of this utility model are as follows: The independent pier bridge reinforcement structure of this utility model has a columnar enlargement poured on the outer periphery of the upper part of the existing independent pier bridge. The columnar enlargement is composed of upper concrete and radial diameter and annular stirrups poured therein, and the inner end of the radial stirrups is embedded in the pier. In this way, the columnar enlargement is firmly fixed to the pier. Support beams inclined outward and upward are fixed on the columnar enlargement on both sides of the pier. Additional supports for the box girder are fixed on the upper part of the support beams. In this way, the box girder is not only supported by the original pier, but also by the two support beams, so that the box girder has three support points in the width direction of the bridge. Even if a heavy vehicle appears on one side of the bridge and causes an imbalance of forces, it will not cause the bridge to tilt or overturn, thus solving the problem of easy overturning of existing independent pier bridges.
[0011] Furthermore, a tapered expansion section is provided below the column-shaped expansion section and is fixedly connected to it. The tapered expansion section is composed of lower concrete and radial reinforcing bars and circumferential stirrups cast therein. In this way, the joint setting of the column-shaped expansion section and the tapered expansion section is equivalent to increasing the fixed connection area between it and the pier column, ensuring the stability of the support beam above the column-shaped expansion section, which makes the support beam for the box girder more stable.
[0012] Furthermore, by setting a semi-circular tie plate around the outer perimeter of the column enlargement, and welding the outer ends of the radial reinforcement bars in the column enlargement to the semi-circular tie plate, and by using expansive concrete for the upper part of the concrete, the slight expansion during the solidification process of the expansive concrete will drive the semi-circular tie plate to move slightly outward. The outwardly moving semi-circular tie plate is then bound by the radial reinforcement bars, thereby generating compressive stress on the outer surface of the pier column, which firmly fixes the column enlargement to the pier column and ensures that the column enlargement is firmly supported by the support beam for the box girder. Attached Figure Description
[0013] Figure 1 This is a structural schematic diagram of an existing independent pier bridge;
[0014] Figure 2 This is a structural schematic diagram of the independent pier bridge reinforcement structure of this utility model;
[0015] Figure 3 This is a cross-sectional view of the independent pier bridge reinforcement structure of this utility model;
[0016] Figure 4 for Figure 3 Enlarged view of a local area in the middle;
[0017] Figure 5 for Figure 3 A sectional view of section AA in the middle.
[0018] In the diagram: 1 Pier, 2 Pile foundation, 3 Foundation cap, 4 Box girder, 5 Support, 6 Ground, 7 Column enlargement, 8 Support beam, 9 Additional support, 10 Conical enlargement, 11 Radial reinforcement, 12 Embedded bolt, 13 Inclined beam, 14 Bottom slab, 15 Top slab, 16 Circular stirrup, 17 Upper concrete, 18 Lower concrete, 19 Semi-circular tie plate. Detailed Implementation
[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0020] like Figure 1 The diagram shows a structural schematic of an existing independent pier bridge. The bridge consists of pile foundations 2, abutments 3, piers 1, and a box girder 4, arranged from bottom to top. The abutment 3 is fixed to the upper end of the pile foundation 2, the lower end of the pier 1 is fixed to the abutment 3, and the upper end of the pier 1 is fixed with a support 5 to support the box girder 4. It is evident that only one pier 1 is located below the box girder 4, and this single pier 1 supports the box girder 4 only through one support 5. When vehicles carrying heavy loads travel on one side of the road above the box girder 4, the box girder 4 may tilt, potentially leading to overturning and endangering the safety of passing vehicles. Therefore, this invention provides a structure for reinforcing existing independent pier bridges to prevent tilting or overturning.
[0021] like Figure 2 and Figure 3 As shown, the schematic diagram and sectional view of the independent pier bridge reinforcement structure of this utility model are given respectively. Figure 4 and Figure 5 They were given respectively Figure 3 The enlarged view of a local area and the sectional view of section AA show that the upper part of the pier 1 is fixed with a columnar enlargement 7. Two outwardly and upwardly inclined support beams 8 are fixed on the columnar enlargement 7. The upper ends of the two support beams 8 are fixed with additional supports 9. The additional supports 9 support the box girder 4. The two additional supports 9 and the support 5 are on the same straight line and along the width direction of the box girder 4. In this way, the box girder 4, which was originally supported by one support 5 on the pier 1, is now supported by three support points (one support 5 and two additional supports 9) to ensure that the pier 1 provides stable support for the box girder 4.
[0022] The columnar enlargement 7 shown consists of an upper concrete 17 and radial reinforcing bars 11 and annular stirrups 16 cast within the upper concrete 17. The radial reinforcing bars 11 are evenly distributed within the upper section of the pier column 1, with their length direction aligned with the radial direction of the pier column 1. The inner ends of the radial reinforcing bars 11 are embedded within the pier column 1. Within the same horizontal cross-section of the pier column 1, there are three annular stirrups 16, with the inner diameter of the three annular stirrups 16 gradually increasing. The three annular stirrups 16 with different inner diameters are evenly distributed around the periphery of the pier column 1, and the annular stirrups 16 are tied together with the radial reinforcing bars 11. Thus, after the upper concrete 17 is poured, the columnar enlargement 7 is firmly fixed to the pier column 1, ensuring the auxiliary support of the supporting beam 8 for the box girder 4.
[0023] To ensure a secure connection between the upper concrete 17 and the pier column 1, the upper concrete 17 is made of expansive concrete. Two semi-circular tie plates 19 are provided around the periphery of the column-shaped enlargement 7. The outer ends of the radial reinforcing bars 11 in the upper concrete 17 are fixed to the semi-circular tie plates 19. To ensure a secure connection between the radial reinforcing bars 11 and the semi-circular tie plates 19, through holes are provided on the semi-circular tie plates 19 for the outer ends of the radial reinforcing bars 11 to pass through. After the outer ends of the radial reinforcing bars 11 pass through the through holes on the semi-circular tie plates 19, they are then welded to them.
[0024] Since the upper concrete 17 uses expansive concrete, the semi-circular tie plate 19 will move slightly outward during the solidification process of the expansive concrete. The semi-circular tie plate 19, which moves slightly outward, is constrained by the radial reinforcement 11, which will exert pressure on the upper concrete 17 and press it towards the outer periphery of the pier column 1, thereby achieving a firm fixation of the column enlargement 7 on the pier column 1.
[0025] To further ensure a firm connection between the columnar enlargement 7 and the pier 1, a tapered enlargement 10 is provided at the lower part of the columnar enlargement 7. The tapered enlargement 10 is thicker at the top and thinner at the bottom, and its upper end is fixedly connected to the lower end of the columnar enlargement 7. The tapered enlargement 10 is composed of a lower concrete 18 and radial reinforcing bars 11 and annular stirrups 16 cast in the lower concrete 18. The addition of the tapered enlargement 10 effectively increases the contact area with the outer surface of the pier 1, thereby increasing the connection strength between the columnar enlargement 7 and the pier 1.
[0026] The supporting beam 8 shown consists of a base plate 14, an inclined beam 13, and a top plate 15. The base plate 14 and the top plate 15 are horizontally fixed to the lower and upper ends of the inclined beam 13, respectively. An additional support 9 is fixed to the top plate 15, providing support for the box girder 4. During the casting process, the columnar enlargement 7 has pre-embedded bolts 12. Bolt holes are provided on the base plate 14 through which the upper ends of the pre-embedded bolts 12 pass. After the upper ends of the pre-embedded bolts 12 pass through the bolt holes on the base plate 14, they are tightened with nuts, thus achieving a firm fixation of the supporting beam 8 to the columnar enlargement 7. To ensure the stability of the supporting beam 8, the inclined beam 13 has a cross-shaped cross section and consists of a central plate and web plates fixed to both sides of the central plate.
[0027] As can be seen, the independent pier bridge reinforcement structure of this utility model, by adding a column-shaped enlargement 7 and two support beams 8, increases the existing support point (the support 5 at the upper end of the pier 1) for the box girder 4 to three points (one support 5 and two additional supports 9) for supporting the box girder 4, ensuring the stability of the box girder 4. When the box girder 4 is subjected to lateral pressure, it will not tilt or overturn.
Claims
1. A bridge reinforcement structure with independent piers, comprising, from bottom to top, pile foundations (2), pile caps (3), piers (1), and box girders (4), wherein the pile caps are fixed to the top of the pile foundations, the lower end of the piers is fixed to the pile caps, and the upper end of the piers is fixed with supports (5) for supporting the box girders; the pile foundations and pile caps are located below the ground (6); characterized in that: The upper part of the pier is enlarged in a column (7) and the upper surface of the column is fixed with outwardly inclined support beams (8) on both sides. The upper end of the support beam is fixed with an additional support (9) to support the bottom of the box girder. The column enlarged part is composed of upper concrete (17) and radial anchor bars (11) and ring stirrups (16) poured in the upper concrete. The inner end of the radial anchor bars is inserted into the pier. The ring stirrups are located on the outer periphery of the pier and tied to the stirrups. The column enlarged part on both sides of the pier is pre-embedded with pre-embedded screw rods (12) for fixing the support beams.
2. The independent pier bridge reinforcement structure according to claim 1, characterized in that: The support beam (8) is composed of an inclined beam (13), a bottom plate (14) and a top plate (15). The bottom plate and the top plate fix the lower end and the upper end of the inclined beam, respectively. The bottom plate and the top plate are both horizontal. The bottom plate has bolt holes through which the upper end of the pre-embedded bolts pass.
3. The independent pier bridge reinforcement structure according to claim 1 or 2, characterized in that: Below the columnar enlargement (7) is a tapered enlargement (10) that is thicker at the top and thinner at the bottom. The upper end of the tapered enlargement is fixedly connected to the lower end of the columnar enlargement. The tapered enlargement is composed of lower concrete (18) and radial anchor bars (11) and annular stirrups (16) poured into the lower concrete. The annular stirrups are tied to the radial anchor bars, and the inner end of the radial anchor bars is inserted into the pier column (1). The lower concrete is ordinary concrete.
4. The independent pier bridge reinforcement structure according to claim 1 or 2, characterized in that: Two semi-circular tie plates (19) are provided around the cylindrical enlarged part (7). The outer ends of the radial reinforcing bars (11) in the cylindrical enlarged part are welded to the semi-circular tie plates. The upper concrete (17) is expansive concrete.
5. The independent pier bridge reinforcement structure according to claim 2, characterized in that: The cross-section of the inclined beam (13) is cross-shaped, and the inclined beam is composed of a central plate and web plates fixed on both sides of the central plate.