An abutment, an abutment construction method, a slope terrain arch bridge and an arch bridge construction method

Abstract

This invention relates to the field of bridge technology, specifically to an arch abutment, an arch abutment construction method, an arch bridge for sloping terrain, and an arch bridge construction method. An arch abutment includes an embedded section, a hollow section, and a post-cast section. The embedded section is embedded in the bedrock of the foundation. The hollow section is located on the top surface of the embedded section. The post-cast section is used for a solid connection with the main arch. The embedded section is a solid structure. The hollow section includes a vertical arm and an inclined arm. The vertical arm, the inclined arm, and the embedded section can enclose and form a cavity. The embedded section, the hollow section, and the post-cast section are all reinforced concrete structures. By setting a cavity in the arch abutment, the amount of concrete and steel reinforcement used in the arch abutment is significantly reduced. By using a hybrid approach of arch abutments with cavities and solid enlarged arch abutments—that is, using arch abutments with cavities on the side of the sloping terrain with lower ground elevation and solid arch abutments on the side with higher ground elevation—the amount of concrete and steel reinforcement used in the arch abutment is significantly reduced, saving on the cost of the arch bridge.

Description

Technical Field

[0001] This invention relates to the field of bridge technology, and in particular to an arch abutment, an arch abutment construction method, an arch bridge on sloping terrain, and an arch bridge construction method. Background Technology

[0002] Existing conventional arch bridges all use solid enlarged foundations for their arch abutments. However, when an arch bridge is located on sloping terrain with a large difference in elevation between the four arch feet and when it is not possible to excavate the slope on a large scale, the height of the arch abutment at the lower elevation will be significantly greater than that at the higher elevation. If solid enlarged arch abutment foundations are used for all arch abutments, the amount of concrete and steel reinforcement materials used for the arch abutments will be enormous, resulting in high project costs. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of existing technologies, such as the large amount of concrete and steel reinforcement used in the construction of arch bridges on sloping terrain, the high cost of arch abutments, and the need for solid enlarged foundations. This invention provides an arch abutment, an arch abutment construction method, an arch bridge on sloping terrain, and an arch bridge construction method.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, an arch support includes an embedded section, a hollow section, and a post-cast section. The embedded section is embedded in the bedrock of the foundation, the hollow section is located on the top surface of the embedded section, and the post-cast section is used for a solid connection with the main arch. The embedded section is a solid structure, and the hollow section includes a vertical arm and an inclined arm. The vertical arm, the inclined arm, and the embedded section can enclose and form a cavity. The embedded section, the hollow section, and the post-cast section are all reinforced concrete structures.

[0005] The embedded section, hollow section, and post-cast section are all reinforced concrete structures, resulting in a strong arch abutment load-bearing capacity. The arch abutment structure with a hollow section includes, from low to high, the embedded section, the hollow section, and the post-cast section. The embedded section is still a solid structure, which helps to tightly embed the arch abutment into the foundation. The hollow section bears the load from the superstructure of the arch bridge and transfers it to the embedded section. The embedded section is embedded in the bedrock, which provides lateral restraint and vertical support for the embedded section. The bedrock transfers the arch abutment load through wrapping, compression, and shear resistance of the embedded section, ultimately achieving arch abutment stability. The vertical arm, the inclined arm, and the embedded section close to form the hollow section. Compared with the solid arch abutment of the prior art, the hollow section saves materials in this area, significantly reducing the amount of concrete and steel used in the arch abutment, saving more than 20% of the arch abutment cost, and also facilitating construction and ensuring reliable load transmission.

[0006] Preferably, the longitudinal section of the cavity is set as a trapezoid, and the longitudinal section is the section cut along the longitudinal bridge direction.

[0007] More preferably, the inclined arm is along the axis of the arch foot.

[0008] With this technical solution, the axis of the arch shaft and the arch foot are in the same direction as the inclined arm, the force transmission path is clear and the component force is reduced, which helps to improve the stress safety of the arch bridge foundation.

[0009] More preferably, the cavity volume accounts for 40%-60% of the cavity segment volume.

[0010] Preferably, the bottom surface of the embedded section has a through groove in the middle.

[0011] Using this technical solution, the groove adopts a structural design with protruding ends and a concave middle: on the one hand, the protruding parts at both ends can be more firmly embedded in the foundation, improving the initial anchoring effect; on the other hand, the foundation between the grooves is retained when the foundation pit is excavated, and then the groove concrete and the above-ground concrete are poured, so that the groove and the foundation form a cooperative force-bearing system, thereby enhancing the overall stability of the arch seat and ensuring the uniformity and reliability of the load transfer to the foundation.

[0012] Preferably, prestressed steel strands are provided inside the inclined arm along the longitudinal direction of the inclined arm.

[0013] In this field, prestressed steel strands refer to load-bearing components that directly bear and transmit prestress. They are essentially high-strength steel products that generate tensile force through tensioning and then convert the tensile force into prestress in concrete, thereby improving the crack resistance, stiffness, and load-bearing capacity of the structure.

[0014] The prestressed steel strands are arranged longitudinally along the inclined arm, meaning that the direction of the prestressed steel strands, the direction of the inclined arm, and the direction of the arch axis are the same. This is beneficial because the direction of the prestress generated by the prestressed steel strands in the inclined arm through tensioning is the same as the direction of the force on the inclined arm. When the inclined arm is subjected to external compressive stress transmitted from the arch axis, the pre-applied prestressed compressive stress can form a synergistic force with the external compressive stress, thereby offsetting part of the load stress or optimizing the stress distribution, effectively reducing the actual peak stress of the inclined arm, and thus improving the overall stress safety of the structure.

[0015] Preferably, the longitudinal cross-sectional width of the embedded segment is greater than the longitudinal cross-sectional width of the cavity segment.

[0016] This technical solution increases the stress-bearing area of ​​the embedded section and reduces the pressure per unit area, which helps to improve the stability of the arch seat and further reduce the amount of arch seat material used.

[0017] Secondly, a construction method for an arch seat, used for constructing the aforementioned arch seat, includes the following steps: S1. Install the reinforcing steel bars of the arch abutment in the arch abutment foundation pit, and pour the concrete to form the embedded section; S2. Install prestressed steel strands; S3. Pour concrete into the cavity section, and after the concrete reaches the design strength, tension the prestressed steel strands. S4. Pour the concrete for the post-pouring section.

[0018] Thirdly, an arch bridge for sloping terrain includes a main arch, suspenders, main beams and arch columns, wherein the arching line elevation H at the arch foot of the main arch is consistent, and it also includes a solid arch seat and the aforementioned arch seat. The solid arch seat includes a solid section and a post-cast section. The arch seat is used on the side of the sloping terrain with a lower ground elevation and on the side of the sloping terrain with a higher ground elevation.

[0019] The ground elevation on the lower side of the slope is H1, and the ground elevation on the higher side of the slope is H2.

[0020] Fourthly, a construction method for an arch bridge, used for constructing an arch bridge on a sloping terrain, includes the following steps: A1. Construct the embedded section and hollow section of the arch seat in the arch seat foundation pit, and construct the solid section of the solid arch seat; A2. Install the main arch foot into the post-cast section of the arch seat and the post-cast section of the solid arch seat, and pour concrete for the post-cast section of the arch seat and the post-cast section of the solid arch seat. A3. Construction of the main arch; A4. Install the hangers and arch columns; A5. Hoisting the main beam.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. An arch seat, which significantly reduces the amount of concrete and steel reinforcement used by setting a cavity in the arch seat, and is firmly embedded in the foundation by setting the embedded section with a through groove in the middle of the bottom surface, making the load transfer to the foundation more stable and reliable. The inclined arm set in the cavity section along the direction of the arch axis and arch foot axis makes the load transfer path of the upper structure arch ring more accurate and effective, and reduces the structural size of the arch seat.

[0022] 2. A construction method for an arch abutment, which involves first installing reinforcing bars in the arch abutment foundation pit, then gradually pouring the embedded section, the cavity section, and the post-cast section, and using post-tensioning prestressing method, which is beneficial to improving the crack resistance, stiffness, and load-bearing capacity of the component; the structural form formed by phased construction makes the internal structure of the arch abutment relatively clear, which is convenient for subsequent inspection and maintenance.

[0023] 3. An arch bridge for sloping terrain: When the arch bridge is located on a sloping terrain with a large difference in elevation between the four arch feet and the slope cannot be excavated on a large scale, the height of the arch abutment at the lower elevation will be significantly greater than that at the higher elevation. By using a combination of arch abutments with cavities and solid arch abutments, i.e., using arch abutments with cavities on the side of the sloping terrain with lower elevation and solid arch abutments on the side of the sloping terrain with higher elevation, the amount of concrete and steel reinforcement used for the arch abutments is greatly reduced, thus saving the cost of the arch bridge.

[0024] 4. A construction method for an arch bridge, which involves first constructing the arch abutments and then installing the main arch feet into the post-cast sections of the arch abutments and the solid arch abutments, facilitates consistency in the arch foot elevation and improves structural stability. The differentiated construction of the solid arch abutments and the arch abutments can optimize the structure while ensuring overall load-bearing capacity, reduce foundation load and material costs, and the overall process efficiently adapts to the stress requirements and quality control requirements of arch bridge construction. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the elevation structure of an arch seat; Figure 2 This is a schematic diagram showing the location of the prestressed steel strands; Figure 3 This is a schematic diagram of the elevation structure of an arch bridge located on a lower side of the terrain. Figure 4 This is a schematic diagram of the elevation structure of an arch bridge located on a higher elevation. Figure 5 This is a schematic diagram of the facade structure of a solid arch seat.

[0026] Marked in the image: 1-Main arch, 2-Hanging rod, 3-Main beam, 4-Column on arch, 5-Arch seat, 6-Solid arch seat, 7-Prestressed steel strand, 8-Tensioning end anchorage, 9-Anchorage end anchorage, 501-Fixing section, 502-Cavity section, 503-Post-cast section, 521-Inclined arm, 522-Vertical arm, 523-Cavity, 601-Solid section, 5011-Groove. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to specific embodiments. However, this should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0028] Unless otherwise specified, the terms "upper," "lower," "left," "right," "center," "inner," and "outer," etc., used in the description of specific embodiments of the present invention to indicate orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the product / equipment / device is usually placed during use. These terms are merely for the purpose of facilitating the description of the present invention or simplifying the description in specific embodiments, and for enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a particular device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on the present invention.

[0029] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," "parallel," and "coaxial" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, parallel, or coaxial. Slight tilt or deviation is permissible, as long as it does not affect the normal function of the relevant component. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," not that the structure must be perfectly horizontal; a slight tilt is acceptable. "Coaxial" means that two components are arranged as coaxially as possible, allowing them to move coaxially or approximately coaxially when their relative positions change. Alternatively, it can be simplified to mean that the corresponding device / component / element, when arranged in "horizontal," "vertical," "suspended," "parallel," or "coaxial" directions, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. For example, the deviation in the "coaxial" direction is controlled within 0.2-1mm, preferably within 0.2-0.5mm. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present invention.

[0030] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0031] Furthermore, in the description of the embodiments of the present invention, "several", "more than", and "a number of" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0032] Furthermore, in the description of the technical solution of this invention, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "provided with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to connection methods commonly used in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0033] Example 1 like Figure 1 As shown, an arch support includes a fixed section 501, a hollow section 502, and a post-cast section 503. The fixed section 501 is fixed in the bedrock of the foundation. The hollow section is located on the top surface of the fixed section 501. The post-cast section 503 is used for a solid connection with the main arch. The fixed section 501 is a solid structure. The hollow section 502 includes a vertical arm 522 and an inclined arm 521. The vertical arm 522, the inclined arm 521, and the fixed section 501 can enclose and form a cavity 523. The fixed section 501, the hollow section 502, and the post-cast section 503 are all reinforced concrete structures.

[0034] The concrete of the arch abutment structure with cavities, from bottom to top, consists of the embedded section 501, the cavity section 502, and the post-cast section 503. The embedded section 501 is embedded in the bedrock of the foundation. The cavity section 502 is located on the top surface of the embedded section 501. The post-cast section 503 is poured last after the embedded section 501, the cavity section 502, and the reinforcing steel are constructed. The reinforcing steel, including transverse, longitudinal, vertical, and diagonal reinforcing steel, is arranged within the areas of the embedded section 501, the cavity section 502, and the post-cast section 503.

[0035] The embedded section 501 tightly embeds the arch seat with a cavity into the foundation. The cavity section 502 bears the load from the superstructure of the arch bridge and transfers it to the embedded section 501. By setting the cavity, the amount of concrete and steel reinforcement is greatly reduced. The post-cast section 503 is the part of the arch seat that is poured after all other structures of the arch seat have been poured.

[0036] In some alternative designs, the longitudinal cross-section of the cavity 523 is set as a trapezoid, and the four corners of the trapezoid are chamfered, or the cavity 523 can also be set as other shapes. The vertical arm 522, the inclined arm 521 and the embedded section 501 enclose the cavity 523, and the cavity is open-ended without being blocked on both sides. This design helps to further save on the amount of concrete and steel reinforcement.

[0037] In some alternative solutions, the inclined arm 521 is along the axis of the arch shaft and the arch foot, ensuring that the axis of the arch shaft and the arch foot is parallel to the direction of the inclined arm 521, or it can coincide with the axis of the arch shaft. This arrangement is beneficial to a clear force transmission path and reduces component forces, which is beneficial to improving the stress safety of the arch bridge foundation.

[0038] In some alternative solutions, the cavity volume accounts for 40%-60% of the cavity segment volume.

[0039] like Figure 2 As shown, in some alternative embodiments, a prestressed steel strand 7 is arranged longitudinally within the inclined arm 521. The tensioning end anchor 8 of the prestressed steel strand 7 is located near the top end of the inclined arm 521, and the anchorage end anchor 9 of the prestressed steel strand 7 is located near the bottom end of the inclined arm 521. The tensioning end anchor 8 provides tension to the prestressed steel strand 7, and the anchorage end anchor 9 provides anchorage to the prestressed steel strand 7. The prestressed steel strand 7 protrudes slightly downward and is close to the cavity 523. Alternatively, the prestressed steel strand 7, the tensioning end anchor 8, and the anchorage end anchor 9 can also be located in other positions. The prestressed steel strand 7 is the core load-bearing component that directly bears and transmits the pretension force. Its function is to pre-apply compressive stress to the structure through tension. The orientation of the prestressed steel strand 7 is consistent with the axial direction of the inclined arm 521, which can pre-apply compressive stress along its axial direction to the inclined arm 521. When the inclined arm 521 bears external compressive stress transmitted from the arch axis, the pre-applied prestressed compressive stress can form a synergistic force with the external compressive stress to offset part of the load stress or optimize the stress distribution, effectively reducing the actual peak stress of the inclined arm, thereby improving the overall stress safety of the structure.

[0040] In some alternative solutions, the embedded section 501 is configured to have a through groove 5011 in the center of the bottom surface, or it can be configured to have other serrated shapes.

[0041] The groove 5011 of the embedded section 501 adopts a structural design with protruding ends and concave middle: on the one hand, the protruding ends can be more firmly embedded in the foundation, improving the initial anchoring effect; on the other hand, the concave area of ​​the groove 5011 will be filled with ground soil, so that the groove and the foundation form a cooperative force system, thereby enhancing the overall stability of the arch seat and ensuring the uniformity and reliability of the load transfer to the foundation.

[0042] In some alternative solutions, the longitudinal cross-sectional width of the embedded section is greater than that of the cavity section. By increasing the stress-bearing area of ​​the embedded section, the pressure per unit area is reduced, which helps to improve the stability of the arch seat.

[0043] Example 2 A method for constructing an arch seat, as described in Example 1, includes the following steps: S1. Install the reinforcing steel bars of the arch abutment in the arch abutment foundation pit, and pour the concrete to form the embedded section 501; S2. Install prestressed steel strands 7; S3. Pour 502 concrete into the cavity section. After the concrete reaches the design strength, tension the prestressed steel strands 7. S4. Pour 503 concrete into the post-pouring section.

[0044] Specifically, in step S1, the reinforcing bars include transverse reinforcing bars, longitudinal reinforcing bars, vertical reinforcing bars, and diagonal reinforcing bars; steps S2 and S3 employ the post-tensioning prestressing method. In this field, the post-tensioning prestressing method refers to first casting a concrete component and reserving threading ducts or pre-embedding corrugated pipes inside the component; after the concrete strength reaches the design requirements, the prestressing steel strands, generally steel strands, steel wire bundles, or other materials, are threaded into the ducts, and tensioning equipment, generally jacks or oil pumps, is used to tension the steel strands, causing them to undergo elastic deformation and store tension; after tensioning is completed, the tension of the steel strands is permanently anchored at both ends of the component through anchorages, and finally, the recoil force of the steel strands applies prestress to the concrete, thereby improving the crack resistance, stiffness, and load-bearing capacity of the component.

[0045] Specifically, the cavity segment 502 does not need to be backfilled, or it may be partially or completely backfilled.

[0046] Example 3 When an arch bridge is located on sloping terrain with significant elevation differences at the four arch abutments and where extensive slope excavation is not feasible, the height of the arch abutments at the lower elevation will be significantly greater than that at the higher elevation. If solid enlarged arch abutments are used for all abutments, the amount of concrete and steel reinforcement required for the abutments will be enormous, resulting in high construction costs. Therefore, arch bridges often employ a combination of arch abutments with cavities and solid enlarged arch abutments.

[0047] like Figure 3-5 As shown, an arch bridge on sloping terrain includes a main arch 1, suspenders 2, main beams 3, and arch columns 4. The elevation H of the arching line at the four arch feet of the main arch 1 is the same. It also includes a solid arch seat 6 and an arch seat 5 as described in Embodiment 1. The solid arch seat 6 includes a solid section 601 and a cast-in-place section 503. The arch seat 5 is used on the side of the sloping terrain with a lower elevation, and the solid arch seat 6 is used on the side of the sloping terrain with a higher elevation. The elevation of the lower slope is H1, and the elevation of the higher slope is H2.

[0048] In some alternative designs, the main arch 1 can be a steel-concrete composite arch, or a steel box arch or a concrete main arch, with a catenary shape or other shapes.

[0049] The main arch 1 and the main beam 3 are connected as a whole by the hanger 2 and the arch column 4. The hanger 2 is connected to the main arch 1 and the main beam 3 by a special anchor. The arch column 4 is welded to the main arch 1 as a steel pipe concrete main arch, a steel box arch, or a pre-embedded concrete main arch. After the main arch 1 is connected to the arch seat 5 and the solid arch seat 6 by pre-embedded segments, the concrete in the post-cast section 503 of the arch seat 5 and the post-cast section 503 of the solid arch seat 6 forms a solid connection of the steel pipe concrete main arch, the steel box arch, or the pre-embedded main arch reinforcement. Then, the concrete in the post-cast section 503 of the arch seat 5 and the post-cast section 503 of the solid arch seat 6 is poured to solidify and connect the concrete main arch. The bases of the arch seat 5 and the solid arch seat 6 are embedded in the foundation. The arch seat 5 is located on the side with a lower elevation of the terrain, and the solid arch seat 6 is located on the side with a higher elevation of the terrain. Since the arching line elevation H at the arch foot of the main arch 1 is consistent, the elevation of each surface of the slope terrain is determined according to the baseline defined by the arching line elevation H.

[0050] Specifically, when both arch feet of the main arch 1 are located on opposite sides of a sloping terrain, a significant difference in ground elevation will occur. In this case, the arch seat 5 is used on the side with the lower elevation, and the solid arch seat 6 is used on the side with the higher elevation of the sloping terrain, ensuring that the arch elevation H at the arch feet is consistent. The arch seat on the other side is set up as above. When both arch feet of the main arch 1 are located on the side with the higher elevation of the sloping terrain, both arch feet use the solid arch seat 6. When both arch feet of the main arch 1 are located on the side with the lower elevation of the sloping terrain, both arch feet use the arch seat 5, ensuring that the arch elevation H at the arch feet is consistent. Alternatively, the arch seat 5 and the solid arch seat 6 can be flexibly selected for the four arch seats of the arch bridge based on the ground elevation to ensure that the arch elevation H at the arch feet is consistent.

[0051] The main arch 1 bears the loads from itself and the main beam 3, and is the main load-bearing structure of the arch bridge. The elevation H of the arch line at the arch foot of each arch bridge is the same. The suspender 2 transfers the load from the main beam 3 upward to the main arch 1. The main beam 3 bears the dead load from itself and the live loads such as vehicles and pedestrians, and is the main load-bearing structure of the arch bridge. The arch column 4 transfers the load from the main beam downward to the main arch 1. The main arch 1 and the main beam 3 are connected as one unit by the suspender 2 and the arch column 4.

[0052] The arch abutment 5 bears the load from the main arch 1 and transfers it to the foundation. This arch abutment is mainly used on the lower side of the slope where H2 > H1. It is suitable for situations where the height requirement of the arch abutment is high, and the amount of concrete and steel reinforcement used is relatively low. The solid arch abutment 6 bears the load from the main arch 1 and transfers it to the foundation. This arch abutment is mainly used on the higher side of the slope where H2 > H1. The four arch abutments of the arch bridge are flexibly selected from the arch abutment 5 and the solid arch abutment 6 according to the ground elevation.

[0053] Example 4 A construction process for an arch bridge on sloping terrain, based on the hollow arch seat described in Example 1 or the arch bridge described in Example 3, includes: A1. Construct the embedded section 501 and the hollow section 502 of the arch seat 5 in the arch seat foundation pit, and construct the solid section 601 of the solid arch seat 6. A2. Install the arch foot of the main arch 1 into the post-cast section 503 of the arch seat 5 and the post-cast section 503 of the solid arch seat 6, and pour concrete into the post-cast section 503 of the arch seat 5 and the post-cast section 503 of the solid arch seat 6. A3. Cast the main arch 1; A4. Install hanger 2 and arch column 4; A5. Hoisting the main beam 3.

[0054] Specifically, in step A2, when the main arch 1 is selected as a steel-concrete composite main arch or a steel box main arch, the first segment of the main arch 1 is installed into the post-cast section 503 of the arch seat 5 and the post-cast section 503 of the solid arch seat 6, and the concrete of the post-cast section 503 of the arch seat 5 and the solid arch seat 6 is poured. The remaining part of the main arch 1 is then poured by hoisting. When the main arch 1 is selected as a concrete main arch, the reinforcing steel of the main arch 1 is installed into the post-cast section 503 of the arch seat 5 and the solid arch seat 6, and the concrete of the post-cast section 503 of the arch seat 5 and the solid arch seat 6 is poured. The remaining part of the main arch 1 is then poured by cantilevering.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An arch bridge for sloping terrain, comprising a main arch (1), suspenders (2), a main beam (3), and columns on the arch (4), characterized in that, The arching line elevation H at the arch foot of the main arch (1) is consistent. It also includes a solid arch seat (6) and an arch seat (5). The arch seat (5) includes a fixed section (501), a hollow section (502), and a cast-in-place section (503). The fixed section (501) is fixed in the bedrock of the foundation. The hollow section (502) is located on the top surface of the fixed section (501). The cast-in-place section (503) is used for the solid connection with the main arch. The fixed section (501) is a solid structure. The hollow section (502) includes a vertical... The vertical arm (522) and the inclined arm (521) can be enclosed to form a cavity (523). The embedded section (501), the cavity section (502) and the post-cast section (503) are all reinforced concrete structures. The solid arch seat (6) includes a solid section (601) and a post-cast section (503). The arch seat (5) is used on the side of the slope with a lower ground elevation, and the solid arch seat (6) is used on the side of the slope with a higher ground elevation.

2. An arch bridge for sloping terrain according to claim 1, characterized in that, The longitudinal section of the cavity (523) is set as a trapezoid.

3. An arch bridge for sloping terrain according to claim 2, characterized in that, The inclined arm (521) is set along the axis of the arch foot.

4. An arch bridge for sloping terrain according to claim 3, characterized in that, The volume of the cavity (523) accounts for 40%-60% of the volume of the cavity segment (502).

5. An arch bridge for sloping terrain according to claim 1, characterized in that, The embedded section (501) has a through groove (5011) in the middle of its bottom surface.

6. An arch bridge for sloping terrain according to any one of claims 1-5, characterized in that, Prestressed steel strands (7) are arranged along the longitudinal direction of the inclined arm (521).

7. An arch bridge for sloping terrain according to claim 6, characterized in that, The longitudinal cross-sectional width of the embedded section (501) is greater than the longitudinal cross-sectional width of the cavity section (502).

8. A construction method for an arch bridge, characterized in that, The method for constructing an arch bridge on sloping terrain as described in any one of claims 1-7 comprises the following steps: A1. Construct the embedded section (501) and the hollow section (502) of the arch seat (5) in the arch seat foundation pit, and construct the solid section (601) of the solid arch seat (6). A2. Install the arch foot of the main arch (1) into the post-cast section (503) of the arch seat (5) and the post-cast section (503) of the solid arch seat (6), and pour concrete into the post-cast section (503) of the arch seat (5) and the post-cast section (503) of the solid arch seat (6). A3. Construction of the main arch (1); A4. Install the hanger (2) and the arch support column (4); A5. Hoisting the main beam (3).

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