Deep V-shaped canyon large-span arch bridge inclined pile foundation

Abstract

The invention discloses a deep-cut 'V'-shaped canyon large-span arch bridge inclined pile foundation which comprises a round-end-shaped inclined pile, the cross section of the round-end-shaped inclined pile comprises a fan-shaped upper portion and a rectangular lower portion, and the round-end-shaped inclined pile is obliquely arranged in a pile hole; the rectangular bearing platform is connected with the round-end-shaped inclined piles; the arch ribs are supported on the rectangular bearing platform, and the inclination angle of the arch ribs is the same as that of the round-end-shaped inclined piles; the pier body bearing beam is arranged on the rectangular bearing platform; and the junction pier is arranged on the pier body bearing beam. Compared with the prior art, the stress requirement of the deep V-shaped canyon complex geology can be met.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a deep-cut "V"-shaped canyon long-span arch bridge inclined pile foundation. Background Technology

[0002] In the field of bridge engineering, arch bridges are widely used in transportation construction in complex terrains such as rivers and canyons due to their excellent spanning capacity, economical material consumption, and aesthetically pleasing structural form. As the core load-bearing component of an arch bridge, the arch abutment foundation directly bears various loads transmitted from the bridge deck system and stably transfers them to the underground rock mass. The rationality and reliability of its structural form have a decisive impact on the safety performance, construction difficulty, and engineering economy of the entire arch bridge.

[0003] Currently, the mainstream arch foundation types in arch bridge engineering are mainly divided into three categories. Due to differences in structural characteristics, each type is suitable for different geological and engineering environments: The first type is the open-cut foundation. This type of foundation involves directly excavating a pit and pouring concrete at the bottom to form a load-bearing structure. The construction process is relatively simple and low-cost, and the stress transfer path is straightforward. However, open-cut foundations have high requirements for geological conditions and are only suitable for areas with strong shallow soil bearing capacity, low groundwater levels, and unrestricted excavation areas. When encountering scenarios with deep rock strata, poor slope stability, or strict environmental restrictions on excavation operations, open-cut foundations require large-scale earthwork excavation, which not only significantly increases the construction period and cost but may also lead to safety and environmental risks such as slope collapse and soil erosion. Therefore, its application in complex terrain is limited.

[0004] The second type is the composite pile foundation, whose structure falls between open-cut foundations and pure pile foundations. It typically involves connecting multiple piles to a pile cap of a certain size, forming a composite load-bearing system. Compared to open-cut foundations, composite pile foundations can reduce the depth and scope of the excavation pit, are more adaptable to shallow geological conditions, and can extend deep into underground rock strata or stable soil layers, thereby improving the overall bearing capacity of the foundation. Currently, composite pile foundations have become a common choice in canyon or mountain arch bridge projects with moderately complex geological conditions and moderate rock strata burial depths. They balance construction difficulty and structural stability while also controlling project investment to a certain extent.

[0005] The third type is the rock-embedded foundation. Similar to a monopile structure, this type of foundation typically employs a tunnel-like excavation process, embedding the pile directly into stable underground rock strata. The load is borne through the anchoring effect between the pile and the rock strata. The core advantage of rock-embedded foundations lies in their exceptional adaptability to deep geological conditions. They are particularly suitable for complex geological areas where the rock strata are deeply buried and shallow layers contain weak interlayers or fractured rock formations. This minimizes disturbance to the surface and shallow geology, while the high-strength anchoring between the pile and the rock strata ensures the foundation's long-term stability. In arch bridge projects with complex geological conditions such as deep canyons and steep slopes, the application frequency of rock-embedded foundations is gradually increasing due to their low environmental disturbance and high load-bearing reliability.

[0006] As transportation infrastructure development extends into complex terrains such as western mountainous areas and deep canyons, the demand for long-span arch bridges is increasing, especially for those in deep "V"-shaped canyons, which face even more stringent engineering challenges. These canyon terrains typically exhibit the following characteristics: First, complex geological conditions. The rock strata on both sides of the canyon often have developed fissures, uneven weathering, and localized fractures, making it difficult for shallow foundations to meet conventional foundation requirements. Furthermore, the slope stability is poor, and large-scale excavation can easily trigger geological disasters. Second, high environmental protection requirements. Deep "V"-shaped canyons are often ecologically sensitive areas, with strict limitations on the amount of excavation, the extent of vegetation damage, and soil erosion control. Traditional large-scale excavation construction methods are difficult to meet environmental standards. Third, unique load transfer. The force transmitted from the arch bridge deck system to the arch foundation is not simply a vertical or horizontal force, but rather an oblique thrust along the arch rib axis. This load characteristic places higher demands on the foundation's lateral resistance and stress stability. To address the specific needs of large-span arch bridges in deep "V"-shaped canyons, the limitations of the existing three types of arch foundations are becoming increasingly apparent: open-cut foundations are completely unsuitable due to the need for large-scale excavation and complex geological and environmental requirements; composite pile foundations can reduce the amount of excavation, but conventional vertical pile structures cannot efficiently withstand oblique thrust, requiring the increase of pile size or the addition of thrust-resistant components to compensate, leading to increased project costs and construction complexity; while rock-embedded foundations offer reliable load-bearing capacity, the tunnel-type excavation process has a long construction cycle and also faces the problem of insufficient compatibility between vertical piles and oblique thrust, making it difficult to fully utilize the foundation's load-bearing efficiency. Against this backdrop, the industry urgently needs a new type of arch abutment foundation that can adapt to the complex geology of deeply incised "V"-shaped canyons, meet stringent environmental protection requirements, and efficiently withstand the oblique thrust of the arch abutment. Therefore, a type of inclined pile foundation for large-span arch bridges in deeply incised "V"-shaped canyons is proposed. Summary of the Invention

[0007] The purpose of this invention is to provide a inclined pile foundation for a large-span arch bridge in a deep-cut "V"-shaped canyon, which is suitable for the stress requirements of complex geology in deep-cut "V"-shaped canyons.

[0008] The above-mentioned technical objective of the present invention is achieved through the following technical solution: A type of inclined pile foundation for a large-span arch bridge in a deeply incised "V"-shaped canyon, including A round-ended inclined pile, wherein the cross-section of the round-ended inclined pile includes a fan-shaped upper part and a rectangular lower part, and the round-ended inclined pile is inclinedly disposed in the pile hole; A rectangular foundation, wherein the rectangular foundation is connected to the round-ended inclined pile; An arch rib, which is supported on the rectangular support platform, and the inclination angle of the arch rib is the same as that of the round-ended inclined pile; A pier support beam is provided on the rectangular bearing platform; The boundary pier is located on the pier body support beam.

[0009] In a preferred embodiment, at least two round-ended inclined piles are provided.

[0010] In a preferred embodiment, the rectangular support platform is provided with a positioning frame for positioning with the arch rib.

[0011] In a preferred embodiment, the upper surface of the round-ended inclined pile is provided with a strain gauge component for detecting the deformation and displacement of the round-ended inclined pile.

[0012] In a preferred embodiment, the strain gauge component is disposed on the reinforcing steel of the round-ended inclined pile.

[0013] In a preferred embodiment, the strain gauge component includes a plurality of strain gauges and a first wire, the first wire connecting the plurality of strain gauges.

[0014] In a preferred embodiment, the strain gauge is disposed in a mounting box.

[0015] In a preferred embodiment, the strain gauge is provided with a magnetic head, and the side of the pile hole is provided with a plurality of magnets, each of which corresponds to a plurality of strain gauges.

[0016] In a preferred embodiment, the magnet is configured as an electromagnet.

[0017] In a preferred embodiment, the magnetic head is made of iron.

[0018] Compared with existing technologies, the present invention provides a deep-cut "V"-shaped canyon long-span arch bridge inclined pile foundation. The cross-section of the round-ended inclined pile adopts a combination structure of a fan-shaped upper part and a rectangular lower part. This design can optimize the stress distribution of the pile in the inclined state by using the fan-shaped upper part, reducing local stress concentration between the pile body and the rock wall of the pile hole, and enhance the structural stability of the pile itself by using the rectangular lower part. Its inclined arrangement in the pile hole allows the pile body to fit more closely to the deep-cut "V". The direction of the oblique thrust transmitted by the arch abutment of the large-span arch bridge in the canyon allows the oblique force to be transmitted more directly and smoothly to the canyon rock strata, effectively improving the bearing capacity of the pile foundation for oblique loads. The rectangular pile cap connects to the round-ended inclined piles, which on the one hand forms a whole for the load-bearing structure, achieving uniform load distribution among the piles and avoiding overload on a single pile; on the other hand, it provides a stable connection and support for the arch rib and pier bearing beam, ensuring a clear and reliable force transmission path between the superstructure and the foundation. The arch rib is supported on the rectangular pile cap, and its inclination angle is the same as that of the round-ended inclined piles, so that the oblique thrust transmitted by the arch rib is consistent with the force direction of the round-ended inclined piles, forming a synergistic force-bearing system and reducing the additional force caused by angular deviation. Torque or shear force is applied; the pier bearing pad is set on the rectangular abutment, which can play a buffer and transition role, dispersing the load transmitted by the boundary pier before transferring it to the rectangular abutment, avoiding local structural damage due to load concentration at the connection between the boundary pier and the rectangular abutment. At the same time, it can adapt to certain construction errors or structural deformations through its own structural adjustment, improving the adaptability of the connection between the superstructure and the foundation; the boundary pier is set on the pier bearing pad, which can rely on the support and transition of the pier bearing pad to stably bear the load transmitted by the bridge deck system, and orderly transfer it to the rectangular abutment and the round-ended inclined piles, and finally conduct it to the canyon rock layer. At the same time, the setting of the boundary pier can form a complete force closed loop with the bridge deck system and the arch rib structure, ensuring the overall stability and operational safety of the entire bridge structure in the environment of a deeply incised "V" shaped canyon. Attached Figure Description

[0019] Figure 1 This invention relates to a structural elevation diagram of an inclined pile foundation for a deep-cut "V"-shaped canyon long-span arch bridge (magnetic components are not shown).

[0020] Figure 2 This invention relates to a structural plan view of an inclined pile foundation for a deep-cut "V"-shaped canyon long-span arch bridge (magnetic components are not shown).

[0021] Figure 3 yes Figure 1 Cross-sectional view of AA (magnetic components are not shown).

[0022] Figure 4 yes Figure 1 BB cross-section (magnetic components not shown).

[0023] Figure 5This invention relates to a schematic diagram of the installation method of strain gauge components for inclined pile foundations of a deep-cut "V"-shaped canyon long-span arch bridge.

[0024] Figure 6 This invention relates to a schematic diagram of the internal structure of the mounting box for a strain member of a deep-cut "V"-shaped canyon long-span arch bridge inclined pile foundation. In the picture

[0025] 1. Round-ended inclined pile; 2. Rectangular pile cap; 3. Arch rib; 4. Pier body pad beam; 5. Intersection pier; 6. Strain gauge; 7. First wire; 8. Installation box; 9. Magnetic head; 10. Magnet. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings.

[0027] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0028] like Figures 1 to 6 As shown, a type of inclined pile foundation for a deep-cut "V"-shaped canyon long-span arch bridge includes... A round-ended inclined pile 1, the cross-section of which includes a fan-shaped upper part and a rectangular lower part, is inclinedly disposed in a pile hole; A rectangular foundation 2, which connects to the round-ended inclined pile 1; Arch rib 3, which is supported on the rectangular support 2, and the inclination angle of the arch rib 3 is the same as that of the round-ended inclined pile 1; Pier body support beam 4, the pier body support beam 4 is provided on the rectangular bearing platform 2; The boundary pier 5 is located on the pier body pad beam 4.

[0029] This embodiment describes a deep-cut "V"-shaped canyon arch bridge inclined pile foundation. The cross-section of the round-ended inclined pile 1 consists of a fan-shaped upper part and a rectangular lower part. This structural design optimizes the stress distribution under the inclined state of the pile, reducing local stress concentration at the contact point between the pile and the rock wall of the pile hole. Furthermore, the rectangular lower part strengthens the structural stability of the pile itself. The inclined pile is positioned within the pile hole, aligning with the direction of the oblique thrust transmitted by the arch seat of the deep-cut "V"-shaped canyon arch bridge. This allows the oblique force to be transmitted more directly and smoothly to the canyon rock strata, effectively improving the load-bearing capacity of the pile foundation for oblique loads. The rectangular pile cap 2 connects to the round-ended inclined pile 1. Its function is twofold: firstly, to integrate multiple round-ended inclined piles 1 into a single load-bearing unit, achieving uniform load distribution among the piles and preventing problems caused by overload on individual piles; secondly, to provide a stable connection and support platform for the arch rib 3 and the pier bearing beam 4, ensuring a clear and reliable path for force transmission between the superstructure and the foundation. The arch rib 3 is supported on the rectangular foundation 2, with its inclination angle consistent with that of the round-ended inclined pile 1. This design ensures that the oblique thrust transmitted by the arch rib 3 matches the force direction of the round-ended inclined pile 1, forming a synergistic force-bearing system, thereby reducing the additional torque or shear force caused by the inconsistency in angle. The pier body pad beam 4 is set on the rectangular foundation 2, which can play a buffering and transition role, dispersing the load transmitted from the junction pier 5 before transferring it to the rectangular foundation 2. This avoids local structural damage at the connection between the junction pier 5 and the rectangular foundation 2 due to load concentration. At the same time, it can also adapt to certain construction errors or structural deformations through its own structural fine-tuning, enhancing the adaptability of the connection between the superstructure and the foundation. The junction pier 5 is set on the pier body pad beam 4. It can stably bear the load transmitted by the bridge deck system by relying on the support and transition of the pier body pad beam 4, and orderly transfer the load to the rectangular abutment 2 and the round-ended inclined pile 1, and finally transmit it to the canyon rock strata. At the same time, the setting of the junction pier 5 can form a complete force closed loop together with the bridge deck system and the arch rib 3 structure, ensuring that the entire bridge structure has good overall stability and operational safety in the environment of the deep "V" shaped canyon.

[0030] Furthermore, at least two circular-ended inclined piles 1 are provided; in this embodiment, two piles are provided.

[0031] Furthermore, the rectangular foundation 2 is equipped with a positioning frame for positioning the arch rib 3. The positioning frame limits the installation position of the arch rib 3 on the foundation, preventing the arch rib 3 from deviating from the preset force direction due to installation deviations, and ensuring that the inclination angle of the arch rib 3 and the round-ended inclined pile 1 is always consistent. At the same time, the positioning frame also enhances the stability of the connection between the arch rib 3 and the foundation, allowing the oblique thrust transmitted by the arch rib 3 to be transmitted to the foundation more accurately.

[0032] Furthermore, the upper surface of the round-ended inclined pile 1 is equipped with strain gauge components for detecting the deformation and displacement of the round-ended inclined pile 1. This directly captures deformation signs on the inclined pile surface, allowing real-time monitoring of minute deformations in the pile body. Simultaneously, by analyzing the deformation differences in different areas fed back by the strain gauge 6, the displacement of the inclined pile can be indirectly calculated, promptly detecting whether the pile body has deviated beyond a preset range. This provides real-time data for assessing the stress safety of the inclined pile and ensuring the stability of the foundation structure.

[0033] Furthermore, the strain gauge component is mounted on the reinforcing steel of the round-ended inclined pile 1. By mounting the strain gauge component on the reinforcing steel of the round-ended inclined pile 1, the stress deformation of the reinforcing steel can be directly monitored, and stress change data of the core load-bearing component of the inclined pile can be obtained in real time. This can accurately capture the internal stress state of the inclined pile when subjected to the oblique thrust of the arch seat.

[0034] Furthermore, the strain gauge component includes multiple strain gauges 6 and a first wire 7, with the first wire 7 connecting the multiple strain gauges 6. The multiple strain gauges 6 can simultaneously collect deformation data at different positions of the round-ended inclined pile 1, realizing multi-point monitoring of the stress state of the pile body and avoiding the limitations of single-point monitoring; the first wire 7 can centrally transmit the monitoring signals of each strain gauge 6, ensuring the continuity and stability of data transmission.

[0035] Furthermore, the strain gauge 6 is housed in the mounting box 8. The mounting box 8 provides physical protection for the strain gauge 6, preventing impurities such as soil particles and moisture from directly contacting the strain gauge 6 during the construction or use of the round-ended inclined pile 1, thus preventing damage or interference that could affect the monitoring accuracy.

[0036] Furthermore, the strain gauge 6 is equipped with a magnetic head 9, and multiple magnets 10 are provided on the side of the pile hole, with each magnet 10 corresponding to one of the strain gauges 6. The magnetic head 9 on the strain gauge 6 interacts with the corresponding magnets 10 on the side of the pile hole. When the shape or angle of the inclined pile changes, the strain gauges 6 at different positions will undergo differentiated deformation due to the change in the relative position of the magnetic head 9 and the corresponding magnet 10. By capturing the signal differences of these strain gauges 6, the degree of angular displacement and overall shape change of the inclined pile can be accurately deduced, achieving effective monitoring of the spatial attitude change of the inclined pile after being subjected to force.

[0037] Furthermore, the magnet 10 is configured as an electromagnet. By configuring the magnet 10 as an electromagnet, the magnetic field strength can be flexibly controlled by adjusting the current, thereby precisely adjusting the attraction force between it and the magnetic head 9 of the strain gauge 6. When the inclined pile undergoes changes in angle or shape, the sensitivity of the magnetic interaction can be optimized according to monitoring needs, making it easier for the strain gauge 6 to capture signal differences caused by subtle displacements, thus improving the accuracy of monitoring changes in the spatial attitude of the inclined pile.

[0038] In this embodiment, the magnetic head 9 is made of iron.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Unless otherwise specified, an element defined by the phrase "comprising..." or "including..." does not exclude the presence of additional elements in the process, method, article, or terminal device that includes said element. Additionally, in this document, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number.

[0040] The above description of the embodiments is provided to facilitate understanding and use of the present invention by those skilled in the art. It is obvious to those skilled in the art that various modifications can be easily made to the embodiments, and the general principles described herein can be applied to other embodiments without creative effort. Therefore, the present invention is not limited to the above embodiments. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A type of inclined pile foundation for a large-span arch bridge in a deeply incised "V"-shaped canyon, characterized in that, include A round-ended inclined pile, wherein the cross-section of the round-ended inclined pile includes a fan-shaped upper part and a rectangular lower part, and the round-ended inclined pile is inclinedly disposed in the pile hole; A rectangular foundation, wherein the rectangular foundation is connected to the round-ended inclined pile; An arch rib, which is supported on the rectangular support platform, and the inclination angle of the arch rib is the same as that of the round-ended inclined pile; A pier support beam is provided on the rectangular bearing platform; The boundary pier is located on the pier body support beam.

2. The inclined pile foundation for a deep-cut "V"-shaped canyon long-span arch bridge according to claim 1, characterized in that, At least two round-ended inclined piles are provided.

3. The inclined pile foundation for a deep-cut "V"-shaped canyon long-span arch bridge according to claim 1, characterized in that, The rectangular support platform is equipped with a positioning frame for positioning with the arch rib.

4. The inclined pile foundation for a deep-cut "V"-shaped canyon long-span arch bridge according to any one of claims 1 to 3, characterized in that, The upper surface of the round-ended inclined pile is provided with strain gauge components for detecting the deformation and displacement of the round-ended inclined pile.

5. The inclined pile foundation for a deep-cut "V"-shaped canyon long-span arch bridge according to claim 4, characterized in that, The strain gauge component is mounted on the reinforcing steel of the circular-ended inclined pile.

6. The inclined pile foundation for a deep-cut "V"-shaped canyon long-span arch bridge according to claim 4, characterized in that, The strain gauge component includes a plurality of strain gauges and a first wire, the first wire connecting the plurality of strain gauges.

7. The inclined pile foundation for a deep-cut "V"-shaped canyon long-span arch bridge according to claim 6, characterized in that, The strain gauge is housed in a mounting box.

8. The inclined pile foundation for a deep-cut "V"-shaped canyon long-span arch bridge according to claim 7, characterized in that, The strain gauge is equipped with a magnetic head, and the side of the pile hole is equipped with multiple magnets, each of which corresponds to one of the strain gauges.

9. The inclined pile foundation for a deep-cut "V"-shaped canyon long-span arch bridge according to claim 8, characterized in that, The magnet is configured as an electromagnet.

10. The inclined pile foundation for a deep-cut "V"-shaped canyon long-span arch bridge according to claim 8, characterized in that, The magnetic head is made of iron.

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