A large-span arch bridge sinking well foundation pile reinforcement structure
By introducing a combined structure of connecting beams and restraint piles into the caisson foundation of a long-span arch bridge, the problem of easy deviation of the caisson foundation in soft soil was solved, achieving higher stability and anti-disturbance ability, and simplifying the construction process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- PINGLU CANAL GRP CO LTD
- Filing Date
- 2025-06-18
- Publication Date
- 2026-06-23
Smart Images
Figure CN224395637U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bridge construction technology, and in particular to a pile foundation reinforcement structure for caisson foundations of large-span arch bridges. Background Technology
[0002] Caisson foundations are a common type of building foundation, suitable for areas with poor soil quality or high groundwater levels. They involve sinking a shaft into the ground, with a foundation at the bottom supporting the weight and load of the building. The bearing capacity of a caisson foundation primarily relies on the lateral resistance of the soil layers and the friction at the bottom, thus its application conditions are relatively specific. Caisson foundations for arch bridges are a deep foundation type suitable for large-span arch bridges, mainly used in soft soil layers with insufficient bearing capacity. Traditional caisson foundations for large-span arch bridges are prone to tilting in soft soil layers and struggle to effectively resist the significant horizontal disturbances caused by river construction, leading to uneven settlement of the caisson foundation. Utility Model Content
[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a pile foundation reinforcement structure for caisson foundations of long-span arch bridges, which can enhance the ability of caisson foundations to resist horizontal displacement.
[0004] A pile foundation reinforcement structure for a large-span arch bridge caisson according to a first aspect of this utility model includes: a caisson foundation, a connecting beam, multiple restraint piles, and a retaining wall. The connecting beam is connected to the upper end of the caisson foundation and extends horizontally towards the riverbank; the restraint piles are connected to the end of the connecting beam away from the caisson foundation, are vertically arranged, and their lower ends are inserted into stable ground; multiple restraint piles are spaced apart along a direction parallel to the riverbank; the retaining wall is vertically arranged above the connecting beam and extends along a direction parallel to the riverbank.
[0005] According to an embodiment of this utility model, a pile foundation reinforcement structure for a large-span arch bridge caisson has at least the following beneficial effects: the connecting beam can effectively distribute the load to the parallel-arranged constraint piles, improving the overall structural stability. As a key force transmission component, the connecting beam effectively distributes and transmits the horizontal thrust and part of the overturning moment, which might originally be concentrated on the caisson, to multiple constraint piles inserted into the stable strata behind, enhancing the caisson foundation's ability to resist horizontal displacement.
[0006] According to some embodiments of the present invention, the caisson foundation includes multiple caisson bodies and connecting plates, and the upper ends of adjacent caisson bodies are connected by the connecting plates.
[0007] According to some embodiments of this utility model, the upper end of the caisson body is provided with a pre-embedded steel plate with anti-shear studs, and the connecting plate is fixedly connected to the pre-embedded steel plate.
[0008] According to some embodiments of this utility model, the connecting plate is made of alloy steel, and the outer surface of the connecting plate is provided with an anti-corrosion coating.
[0009] According to some embodiments of this utility model, a main reinforcement cage is pre-embedded in the caisson foundation, the main reinforcement cage extends out of the upper end of the caisson foundation, the connecting beam is a reinforced concrete structure, and the main reinforcement cage is cast in the connecting beam.
[0010] According to some embodiments of the present invention, a reinforcing member is sleeved on the outside of the restraining pile, and the reinforcing member is cast inside the connecting beam. The reinforcing member is used to increase the connection strength between the restraining pile and the connecting beam.
[0011] According to some embodiments of the present invention, the reinforcement includes a first clamp and a second clamp, the first clamp and the second clamp are detachably connected, the restraint pile is clamped between the first clamp and the second clamp, the first clamp is provided with an extension, and the extension extends horizontally toward the caisson foundation.
[0012] According to some embodiments of the present invention, the extension has a protrusion on its side, the protrusion being used to increase the contact surface between the extension and the concrete of the connecting beam.
[0013] According to some embodiments of this utility model, the upper end of the constraint pile extends out of the connecting beam, and the retaining wall and the upper end of the constraint pile are cast as one piece.
[0014] According to some embodiments of this utility model, the constraint pile is circular.
[0015] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:
[0017] Figure 1 This is a schematic diagram of the installation structure of one embodiment of the present utility model;
[0018] Figure 2 This is a side view of one embodiment of the present invention;
[0019] Figure 3 for Figure 2 A cross-sectional view along the AA direction;
[0020] Figure 4 This is a schematic diagram of a reinforcement component according to an embodiment of the present invention.
[0021] Icon labels:
[0022] Caisson foundation 100, caisson body 110, connecting plate 120;
[0023] 200 connecting beams;
[0024] 300mm restraint piles;
[0025] Retaining wall 400;
[0026] Reinforcing component 500, first clamp 510, second clamp 520, extension 511, protrusion 512. Detailed Implementation
[0027] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0028] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They 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. Therefore, they should not be construed as limitations on this utility model.
[0029] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.
[0030] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0031] Reference Figures 1 to 4As shown, an embodiment of this utility model discloses a caisson foundation pile foundation reinforcement structure for a large-span arch bridge, comprising: a caisson foundation 100, a connecting beam 200, multiple restraint piles 300, and a retaining wall 400. The caisson foundation 100 is a well-shaped concrete structure. The construction method for the caisson foundation 100 involves excavating soil from inside the well, pouring concrete well walls, and allowing the concrete well walls to sink to the design elevation under their own weight, overcoming frictional resistance. Then, the bottom is sealed with concrete, and the well hole is filled, making it the foundation for the bridge piers and abutments. As a deep foundation for a large-span arch bridge, the caisson foundation 100 effectively transfers vertical loads to the deep, stable soil layers. A connecting beam 200 is connected to the upper end of the caisson foundation 100, extending horizontally towards the riverbank. Constraint piles 300 are connected to the end of the connecting beam 200 furthest from the caisson foundation 100, are vertically installed, and their lower ends are inserted into stable soil. Multiple constraint piles 300 are spaced apart parallel to the riverbank. A retaining wall 400 is vertically installed above the connecting beam 200, extending parallel to the riverbank. This integrated design, with the retaining wall 400 extending along the riverbank directly above the connecting beam 200, effectively prevents landslides and protects the safety of the caisson foundation 100. Furthermore, this integrated design fully utilizes the connecting beam 200, avoiding the need for a separate complex foundation for the retaining wall 400, simplifying construction, and improving the overall structural integrity. The parallel-arranged constraint piles 300 also act as anti-slide piles, further reducing landslides. The coupling beam 200 effectively distributes the load to the restraint piles 300, improving the overall structural stability. As a key force-transferring component, the coupling beam 200 effectively distributes the horizontal thrust and part of the overturning moment, which might otherwise be concentrated on the caisson, to the multiple restraint piles 300 inserted into the stable stratum behind it, enhancing the caisson foundation 100's ability to resist horizontal displacement and rotation. The added coupling beam 200 and restraint piles 300 also incorporate the stable stratum near the riverbank into the overall load-bearing system. This solves the potential stability problem of the caisson foundation 100 under horizontal disturbances.
[0032] Reference Figures 1 to 3 As shown, the caisson foundation 100 includes multiple caisson bodies 110 and connecting plates 120, with the upper ends of adjacent caisson bodies 110 connected by the connecting plates 120. Multiple smaller caisson bodies 110 can be sunk independently, and each caisson can be adjusted according to the specific geological conditions below it, resulting in greater construction flexibility. Furthermore, the dispersed arrangement of multiple caisson bodies 110 effectively distributes concentrated stress by sharing the load. The connecting plates 120 can relatively fix adjacent caisson bodies 110, preventing uneven settlement and horizontal displacement of the caisson bodies 110, and ensuring the stability and safety of the superstructure.
[0033] Reference Figures 1 to 3As shown, it can be understood that an embedded steel plate with shear studs is provided at the upper end of the caisson body 110, and a connecting plate 120 is welded to the embedded steel plate. The specific structure of the embedded steel plate and the shear studs is existing technology and will not be described in detail. The embedded steel plate and the shear studs provide a large load-bearing area, which can distribute the load transmitted by the connecting plate 120 more evenly to the concrete at the top of the caisson body 110, improve the local bearing capacity of the concrete, reduce stress concentration, and prevent the concrete from being crushed. The connecting plate 120 is stably fixed to the embedded steel plate by welding, which increases the overall structural stability.
[0034] Reference Figures 1 to 3 As shown, it is understandable that the connecting plate 120 is made of alloy steel. Because the connecting plate 120 is located in the humid environment of the river channel, it is prone to rust. Therefore, an anti-corrosion coating is applied to the outer surface of the connecting plate 120. This anti-corrosion coating effectively prevents the connecting plate 120 from weakening its cross-section and reducing its strength due to corrosion. It is foreseeable that the connecting plate 120 can also employ anti-corrosion measures such as sacrificial anode method and impressed current cathodic protection method.
[0035] Reference Figures 1 to 3 As shown, it can be understood that a main reinforcement cage is pre-embedded in the caisson foundation 100, extending beyond the upper end of the caisson foundation 100. The connecting beam 200 is a reinforced concrete structure, and the main reinforcement cage is cast within the connecting beam 200. The main reinforcement cage penetrates through the caisson foundation 100 and the connecting beam 200, forming a continuous skeleton to resist the horizontal shear force at the interface between the caisson and the connecting beam 200. Compared to exposed steel connectors, the main reinforcement cage, encased in concrete, completely isolates itself from environmental erosion, avoiding the strength reduction problem caused by steel corrosion in humid environments.
[0036] Reference Figures 1 to 4 As shown, it can be understood that a reinforcing member 500 is fitted around the outside of the restraint pile 300, and the height of the reinforcing member 500 is equal to the height of the connecting beam 200. The reinforcing member 500 is fitted onto the outside of the restraint pile 300 after it has been poured. The reinforcing member 500 can be prefabricated, reducing on-site construction. The reinforcing member 500 is cast inside the connecting beam 200, and it is used to increase the connection strength between the restraint pile 300 and the connecting beam 200. The restraint pile 300 needs to withstand a large shear force, and shear slip failure is prone to occur at the junction of the restraint pile 300 and the connecting beam 200. Increasing the contact area between the restraint pile 300 and the connecting beam 200 significantly reduces the local compressive stress in the concrete. The reinforcing member 500 solves the stress concentration problem in the joint area between the restraint pile 300 and the connecting beam 200.
[0037] Reference Figures 1 to 4As shown, the reinforcement component 500 includes a first clamp 510 and a second clamp 520, which are bolted together. The first clamp 510 and the second clamp 520 are prefabricated in the factory and quickly tightened on-site with bolts, without the need for welding or pouring. A restraint pile 300 is clamped between the first clamp 510 and the second clamp 520, and the first clamp 510 and the second clamp 520 work together to secure the restraint pile 300. The first clamp 510 has an extension 511 that extends horizontally towards the caisson foundation 100. The extension 511 serves as an anchoring element. The extension 511 can be welded to the reinforcing steel bars within the connecting beam 200 to form a rigid anchoring frame, converting the shear force at the pile top into axial compressive stress in the concrete of the connecting beam 200, effectively dispersing local stress. The first clamp 510 and the second clamp 520 distribute the top horizontal load of the restraint pile 300 to a larger contact surface, while the extension 511 transfers the stress to the depth of the connecting beam 200, thus preventing shear slip failure at the junction of the restraint pile 300 and the connecting beam 200.
[0038] Reference Figures 1 to 4 As shown, it can be understood that the extension 511 has multiple protrusions 512 connected to its side. The protrusions 512 are used to increase the contact surface between the extension 511 and the concrete of the connecting beam 200. The protrusions 512 are embedded in the concrete to form a multi-directional toothed key effect. Through rigid mechanical connection, they improve the pull-out bearing capacity, play an anchoring role, and eliminate the risk of debonding between the extension 511 and the concrete in the connecting beam 200.
[0039] Reference Figures 1 to 4 As shown, it can be understood that the upper end of the restraint pile 300 extends out of the connecting beam 200, and the retaining wall 400 is cast integrally with the upper end of the restraint pile 300. The retaining wall 400 and the restraint pile 300 are rigidly connected to form a frame structure, and the restraint pile 300 directly anchors the retaining wall 400, completely avoiding horizontal displacement of the retaining wall 400, reducing the load on the connecting beam 200, and significantly improving the resistance to horizontal thrust and overturning. It also eliminates the need for an independent foundation for the retaining wall 400, reducing construction steps and shortening the construction period.
[0040] Reference Figures 1 to 3 As shown, it can be understood that the restraint pile 300 is circular. The restraint pile 300 is made of reinforced concrete. Due to the complex construction environment in the river channel, a drilling rig can be used to directly drill holes, then a steel reinforcement cage is placed, and concrete is poured to form the circular restraint pile 300. Drilling the holes in a circular shape can accommodate the complex geological conditions of various layers within the river channel.
[0041] Construction steps:
[0042] Step 1: Excavate the soil in sections, simultaneously pour concrete for the well walls, and allow the wells to sink to the design elevation under their own weight. After removing any remaining soil from the bottom, pour sealing concrete to fill the core, forming multiple caisson bodies 110. Use connecting plates 120 to weld and fix the tops of adjacent caisson bodies 110.
[0043] Step 2: Use a rotary drilling rig to drill a hole, hoist and place the reinforcing cage, pour concrete to form a circular constraint pile 300, and set an additional concrete formwork on the top of the constraint pile 300 to achieve the design elevation;
[0044] Step 3: Connect the first clamp 510 and the second clamp 520 to the top of the restraint pile 300, tie the internal steel bars of the connecting beam 200, set up the formwork and pour concrete to wrap the upper section of the restraint pile 300 and the reinforcement 500 to form the connecting beam 200. Erect the wall formwork on the connecting beam 200 and pour the top of the restraint pile 300 into the retaining wall 400 as a whole.
[0045] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.
Claims
1. A large-span arch bridge open caisson foundation pile reinforcement structure, characterized in that, include: Caisson foundation (100); A connecting beam (200) is attached to the upper end of the caisson foundation (100), and the connecting beam (200) extends horizontally toward the riverbank; Multiple restraint piles (300) are connected to one end of the connecting beam (200) away from the caisson foundation (100). The restraint piles (300) are vertically arranged and the lower end of the restraint piles (300) is inserted into a stable stratum. The multiple restraint piles (300) are spaced apart along a direction parallel to the riverbank. A retaining wall (400) is vertically installed on the upper end of the connecting beam (200), and the retaining wall (400) extends in a direction parallel to the riverbank.
2. The long-span arch bridge open caisson foundation pile reinforcement structure according to claim 1, characterized in that: The caisson foundation (100) includes multiple caisson bodies (110) and connecting plates (120), with the upper ends of adjacent caisson bodies (110) connected by the connecting plates (120).
3. The long-span arch bridge open caisson foundation pile reinforcement structure according to claim 2, characterized in that: The upper end of the caisson body (110) is provided with a pre-embedded steel plate with anti-shear studs, and the connecting plate (120) is fixedly connected to the pre-embedded steel plate.
4. The long-span arch bridge open caisson foundation pile reinforcement structure according to claim 3, characterized in that: The connecting plate (120) is made of alloy steel, and the outer surface of the connecting plate (120) is provided with an anti-corrosion coating.
5. The long-span arch bridge open caisson foundation pile reinforcement structure according to claim 1, characterized in that: The caisson foundation (100) has a pre-embedded main reinforcement cage, which extends out of the upper end of the caisson foundation (100). The connecting beam (200) is a reinforced concrete structure, and the main reinforcement cage is cast into the connecting beam (200).
6. The long-span arch bridge open caisson foundation pile reinforcement structure according to claim 5, characterized in that: The restraint pile (300) is fitted with a reinforcement member (500) on the outside. The reinforcement member (500) is cast into the connecting beam (200). The reinforcement member (500) is used to increase the connection strength between the restraint pile (300) and the connecting beam (200).
7. The long-span arch bridge open caisson foundation pile reinforcement structure according to claim 6, characterized in that: The reinforcement component (500) includes a first clamp (510) and a second clamp (520), which are detachably connected. The restraint pile (300) is sandwiched between the first clamp (510) and the second clamp (520). The first clamp (510) is provided with an extension (511), which extends horizontally toward the caisson foundation (100).
8. The long-span arch bridge open caisson foundation pile reinforcement structure according to claim 7, characterized in that: The extension (511) has a protrusion (512) connected to its side, the protrusion (512) being used to increase the contact surface between the extension (511) and the concrete of the connecting beam (200).
9. The long-span arch bridge open caisson foundation pile reinforcement structure according to claim 1, characterized in that: The upper end of the constraint pile (300) extends out of the connecting beam (200), and the retaining wall (400) and the upper end of the constraint pile (300) are cast as one piece.
10. The long-span arch bridge open caisson foundation pile reinforcement structure according to claim 9, characterized in that: The constraint pile (300) is circular.