Arch support, arch support construction method, slope terrain arch bridge and arch bridge construction method

Abstract

The invention relates to the technical field of bridges, in particular to a skewback, a skewback construction method, a slope terrain arch bridge and an arch bridge construction method.The skewback comprises a built-in section, a cavity section and a post-pouring section, the built-in section is built in foundation bed rock, the cavity section is located on the top face of the built-in section, and the post-pouring section is used for being fixedly connected with a main arch; the built-in section is of a solid structure, the cavity section comprises a vertical arm and an inclined arm, the vertical arm, the inclined arm and the built-in section can define a cavity, and the built-in section, the cavity section and the post-pouring section are all of reinforced concrete structures. The cavity is formed in the skewback, so that the consumption of skewback concrete and steel bars is greatly reduced; the arch bridge adopting the skewback provided with the cavity and the solid expanded skewback in a mixed mode, namely, the skewback provided with the cavity is adopted on the side, with the lower ground elevation, of the slope terrain, and the solid skewback is adopted on the side, with the higher ground elevation, of the slope terrain, so that the using amount of skewback concrete and reinforcing steel bars is greatly reduced, and the manufacturing cost of the arch bridge is saved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bridge, in particular to an arch seat, an arch seat construction method, a slope terrain arch bridge and an arch bridge construction method. BACKGROUND

[0002] The existing conventional arch bridge arch seat is a solid enlarged foundation, but when the arch bridge is located on a slope terrain, the terrain difference at the four arch foot positions is large and the slope cannot be excavated in a large range, the arch seat height at the lower terrain is significantly larger than that at the higher terrain, if the solid enlarged arch seat foundation is used, the amount of concrete and steel material of the arch seat is huge, and the engineering cost is high. SUMMARY

[0003] The present application aims to overcome the deficiencies in the prior art that when the arch bridge is located on a slope terrain, the arch seat is a solid enlarged foundation, the amount of concrete and steel engineering material is large, and the arch seat cost is high, and to provide an arch seat, an arch seat construction method, a slope terrain arch bridge and an arch bridge construction method.

[0004] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: In a first aspect, an arch seat comprises an embedded segment, a cavity segment and a post-cast segment, the embedded segment is embedded in the foundation rock, the cavity segment is located on the top surface of the embedded segment, and the post-cast segment is used for the fixed connection with the main arch, the embedded segment is a solid structure, the cavity segment comprises a vertical arm and an inclined arm, the vertical arm, the inclined arm and the embedded segment can form a cavity, and the embedded segment, the cavity segment and the post-cast segment are all reinforced concrete structures.

[0005] The embedded segment, the cavity segment and the post-cast segment are reinforced concrete structures, so that the arch seat has strong bearing capacity; the arch seat structure with a cavity comprises the embedded segment, the cavity segment and the post-cast segment from low to high, wherein the embedded segment still adopts a solid structure, which is beneficial to tightly embedding the arch seat in the foundation, the cavity segment bears the load from the upper structure of the arch bridge and transmits it to the embedded segment, the embedded segment is embedded in the ground foundation rock, the foundation rock provides lateral restraint and vertical support for the embedded segment, the foundation rock transmits the arch seat load by wrapping, extruding and shearing the embedded segment, and finally realizes the stability of the arch seat; the vertical arm, the inclined arm and the embedded segment form the cavity, compared with the solid arch seat of the prior art, the cavity saves the original material at this position, greatly saves the amount of arch seat concrete and steel, saves more than 20% of the arch seat cost, and is also convenient for construction forming and ensures reliable force transmission.

[0006] Preferably, the longitudinal section of the cavity is set as a trapezoidal shape, and the longitudinal section is a section along the longitudinal direction.

[0007] Further preferably, the inclined arm is along the arch axis and the arch foot axis.

[0008] By adopting the technical scheme, the axis of the arch shaft and the axis of the arch foot are in the same direction as the inclined arm, the force transmission path is clear and the component force is reduced, and the force safety of the arch bridge foundation is improved.

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

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

[0011] By adopting the technical scheme, the groove has a structure design of protruding at both ends and being concave in the middle: on the one hand, the protruding parts at both ends can be more stably embedded into the foundation, improving the initial anchoring effect; on the other hand, the foundation is reserved between the grooves when the foundation pit is excavated, and then the groove concrete and the concrete above the ground are poured, so that the groove and the foundation form a cooperative force system, thereby enhancing the overall stability of the abutment and ensuring the uniformity and reliability of the load transmission to the foundation.

[0012] Preferably, the inclined arm is provided with a prestressed steel tendon in the longitudinal direction of the inclined arm.

[0013] In the field, the prestressed steel tendon refers to a force-bearing component that directly bears and transmits prestress, and is essentially a high-strength steel product that generates tension through tensioning and then converts the tension into the pre-pressure of concrete, thereby improving the crack resistance, stiffness and load-carrying capacity of the structure.

[0014] The prestressed steel tendon is arranged in the longitudinal direction of the inclined arm, that is, the direction of the prestressed steel tendon, the direction of the inclined arm and the direction of the axis of the arch shaft are the same, which is conducive to the fact that the direction of the prestress generated by the tension of the prestressed steel tendon in the inclined arm is the same as the force direction of the inclined arm, and when the inclined arm bears the external compressive stress transmitted from the arch shaft, the prestress applied in advance can form a cooperative force with the external compressive stress by offsetting part of the load stress or optimizing the stress distribution, effectively reducing the actual stress peak value of the inclined arm, and thereby improving the overall force safety of the structure.

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

[0016] By adopting the technical scheme, the force-bearing area of the embedded section is increased, and the unit area pressure is reduced, which is conducive to improving the stability of the abutment and further reducing the amount of abutment material.

[0017] In a second aspect, a construction method of an abutment is used to construct the abutment, and includes the following steps: S1. Installing the reinforcement of the abutment in the abutment foundation pit to form an embedded section; S2. Installing a prestressed steel tendon; S3. Pouring concrete in the cavity section, and after the concrete reaches the design strength, tensioning the prestressed steel beam; S4. Pouring concrete in the post-pouring section.

[0018] In a third aspect, the arch bridge for the sloping terrain comprises a main arch, a suspender, a main beam and an arch column, the elevation H of the arch springing line at the arch foot of the main arch is uniform, and the arch bridge further comprises a solid arch seat and the arch seat described above, the solid arch seat is arranged on the side with a lower ground elevation of the sloping terrain, and the solid arch seat is arranged on the side with a higher ground elevation of the sloping terrain.

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

[0020] In a fourth aspect, a construction method of the arch bridge is provided for the construction of the arch bridge for the sloping terrain, and the method comprises the following steps: A1. Constructing the embedded section and the cavity section of the arch seat in the arch seat foundation pit, and constructing the solid section of the solid arch seat; A2. Installing the arch foot of the main arch into the post-pouring section of the arch seat and the post-pouring section of the solid arch seat, and pouring concrete in the post-pouring section of the arch seat and the post-pouring section of the solid arch seat; A3. Constructing the main arch; A4. Installing the suspender and the arch column; A5. Hoisting the main beam.

[0021] According to the technical scheme described above, the arch seat has the following beneficial effects: 1. The arch seat has the following beneficial effects: the cavity provided in the arch seat greatly saves the amount of concrete and steel bars of the arch seat, the embedded section is provided with a through groove in the middle of the bottom surface to firmly embed the arch seat into the foundation, the load transmission to the foundation is more stable and reliable, the cavity section is provided with a slanted arm along the direction of the arch axis and the suspender axis, the load transmission path of the upper structure arch ring is more accurate and effective, and the size of the arch seat structure is reduced.

[0022] 2. The construction method of the arch seat has the following beneficial effects: the steel bars are first installed in the arch seat foundation pit, and the embedded section, the cavity section and the post-pouring section are gradually poured, and the post-tensioning prestressing method is adopted, which is beneficial to improve the crack resistance, stiffness and bearing capacity of the component; the structure formed by the phased construction is relatively clear, and is convenient for subsequent inspection and maintenance.

[0023] 3. A kind of arch bridge of slope terrain, when arch bridge is located in slope terrain, the terrain height difference at four arch feet is larger and cannot be excavated in large range slope, the arch seat height of terrain lower side will be significantly greater than the arch seat of terrain higher side, by mixedly using arch seat with cavity and solid arch seat, namely using arch seat with cavity in the side of the elevation of ground of slope terrain lower, using solid arch seat in the side of the elevation of ground of slope terrain higher, the amount of arch seat concrete and reinforcement is greatly reduced, and the cost of arch bridge is saved.

[0024] 4. A kind of construction method of arch bridge, by first constructing arch seat, then installing main arch foot to the post-cast section of the arch seat and the post-cast section of the solid arch seat, it is beneficial to the consistency of each arch foot rise elevation and improve the stability of structure, the differential construction of the solid arch seat and the arch seat can optimize the structure under the premise of ensuring overall bearing capacity, reduce foundation load and material cost, the overall process is efficient and adapts to the stress demand and quality control requirement of arch bridge construction. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a kind of arch seat elevation structure schematic diagram; Figure 2 It is prestressed steel beam position schematic diagram; Figure 3 It is a kind of arch bridge elevation structure schematic diagram in terrain lower side; Figure 4 It is a kind of arch bridge elevation structure schematic diagram in terrain higher side; Figure 5 It is a kind of solid arch seat elevation structure schematic diagram.

[0026] Markings in figure: 1-main arch, 2-sling, 3-main beam, 4-arch column, 5-arch seat, 6-solid arch seat, 7-prestressed steel beam, 8-tension end anchor device, 9-anchoring end anchor device, 501-embedded section, 502-cavity section, 503-post-cast section, 521-inclined arm, 522-vertical arm, 523-cavity, 601-solid section, 5011-groove. DETAILED DESCRIPTION

[0027] The application will be described in further detail below with reference to specific embodiments. However, this should not be understood as limiting the scope of the above-mentioned subject matter of the application to the following examples only, but any technology realized on the basis of the content of the application falls within the scope of the application.

[0028] In the description of specific embodiments of the present application, the terms of orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer" and the like are expressed based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship in which the product / device / apparatus of the present application is usually used. These terms of orientation or positional relationship are only for the convenience of describing the present application or simplifying the description in specific embodiments, facilitating the quick understanding of the scheme by the skilled person, and therefore cannot be understood as indicating or implying that a specific device / component / element must have a specific orientation or be constructed and operated in a specific positional relationship, and thus cannot be understood as limiting the present application.

[0029] In addition, the terms "horizontal", "vertical", "overhanging", "parallel", "coaxial" and the like do not mean that the corresponding device / component / element must be absolutely horizontal or vertical or overhanging or parallel or coaxial, but can be slightly inclined or deviated, as long as it does not affect the normal function of the related component. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined; "coaxial" means that two components are arranged as coaxial as possible, and move in a coaxial or approximately coaxial manner when the relative position changes. Alternatively, it can be simplified to understand that the corresponding device / component / element is arranged in the "horizontal", "vertical", "overhanging", "parallel", "coaxial" direction, and can have an error / deviation of ±10% relative to the corresponding direction, more preferably an error / deviation of ±8% or less, more preferably an error / deviation of ±6% or less, more preferably an error / deviation of ±5% or less, and more preferably an error / deviation of ±4% or less. 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 role in the scheme of the present application.

[0030] In addition, the terms "first", "second", "third" and the like in the terms only serve to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of the specific components.

[0031] In addition, in the description of embodiments of the present application, "several", "a plurality of", "several" represent at least 2. It can be 2, 3, 4, 5, 6, 7, 8, 9, etc. in any case, and even more than 9.

[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 optional schemes, the inclined arm 521 is arranged along the direction of the arch axis and the arch foot axis, so that the arch axis is parallel to the direction of the inclined arm 521, or the arch axis can coincide with the direction of the inclined arm 521. This arrangement is conducive to clear force transmission path and reducing component force, and is conducive to improving the safety of the arch bridge foundation under stress.

[0038] In some optional schemes, the volume of the cavity accounts for 40%-60% of the volume of the cavity section.

[0039] As shown in Figure 2 In some optional schemes, the inclined arm 521 is arranged with a prestressed steel tendon 7 along the longitudinal direction of the inclined arm 521. The tension end anchor 8 of the prestressed steel tendon 7 is arranged at the end of the inclined arm 521 close to the top, and the anchoring end anchor 9 of the prestressed steel tendon 7 is arranged at the end of the inclined arm 521 close to the bottom. The tension end anchor 8 plays a tensioning role on the prestressed steel tendon 7, and the anchoring end anchor 9 plays an anchoring role on the prestressed steel tendon 7. The prestressed steel tendon 7 slightly protrudes downward and is close to the cavity 523, or the prestressed steel tendon 7, the tension end anchor 8 and the anchoring end anchor 9 can also be arranged at other positions. The prestressed steel tendon 7 is a core stress component directly bearing and transmitting prestress. The prestressed steel tendon 7 is arranged in the direction consistent with the axis direction of the inclined arm 521, so that the prestress can be applied to the inclined arm 521 along the axis direction of the inclined arm 521. When the inclined arm 521 bears the external pressure stress transmitted from the arch axis, the prestress can form a synergistic stress with the external pressure stress by offsetting part of the load stress or optimizing the stress distribution, effectively reducing the actual stress peak of the inclined arm, and further improving the overall stress safety of the structure.

[0040] In some optional schemes, the embedded segment 501 is arranged with a through groove 5011 in the middle of the bottom surface, or can also be arranged in other zigzag shapes.

[0041] The groove 5011 of the embedded segment 501 is designed in a structure with protrusions at both ends and a concave region in the middle. On the one hand, the protrusions at both ends can be more stably embedded in the foundation, improving the initial anchoring effect. On the other hand, the concave region of the groove 5011 is filled with soil, so that the groove and the foundation form a synergistic stress system, thereby enhancing the overall stability of the arch support and ensuring the uniformity and reliability of the load transmission to the foundation.

[0042] In some optional schemes, the longitudinal cross-sectional width of the embedded segment is greater than the longitudinal cross-sectional width of the cavity section. By increasing the stress area of the embedded segment and reducing the pressure per unit area, the stability of the arch support can be improved.

[0043] Embodiment 2 A construction method of an arch support, the construction of which is as described in Embodiment 1, comprising 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 Figures 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 through the suspender 2 and the arch column 4, wherein the suspender 2 is connected with the main arch 1 and the main beam 3 by using a special anchor, and the arch column 4 is welded with the main arch 1 to form a steel pipe concrete main arch, a steel box arch or a pre-embedded connection concrete main arch. After the main arch 1 and the arch seat 5 and the solid arch seat 6 are pre-embedded, the rear pouring section 503 of the arch seat 5 and the rear pouring section 503 of the solid arch seat 6 are formed into a solid connection by pouring concrete, and then the rear pouring section 503 of the arch seat 5 and the rear pouring section 503 of the solid arch seat 6 are solidly connected with the main arch by pouring concrete. The base of the arch seat 5 and the solid arch seat 6 is embedded in the foundation, wherein the arch seat 5 is located on the side with lower ground elevation, and the solid arch seat 6 is located on the side with higher ground elevation, and since the elevation H of the arch springing line at the arch foot of the main arch 1 is uniform, the ground elevation of the slope terrain is determined according to the baseline defined by the elevation H of the arch springing line.

[0050] Specifically, when the two arch feet of the main arch 1 are located on the high and low sides of the slope terrain, there is a significant difference in ground elevation, and in this case, the arch seat 5 is used on the side with lower ground elevation, and the solid arch seat 6 is used on the side with higher ground elevation, so as to ensure that the elevation H of the arch springing line at the arch foot is uniform, and the other side is set as described above. When the two arch feet of the main arch 1 are located on the side with higher ground elevation of the slope terrain, both arch feet are provided with the solid arch seat 6. When the two arch feet of the main arch 1 are located on the side with lower ground elevation of the slope terrain, both arch feet are provided with the arch seat 5, so as to ensure that the elevation H of the arch springing line at the arch foot is uniform. Alternatively, the four arch seats of the arch bridge can be flexibly selected according to the ground elevation to ensure that the elevation H of the arch springing line at the arch foot is uniform.

[0051] The main arch 1 bears the load from the main arch 1 itself and the main beam 3, and is the main force structure of the arch bridge, and the elevation H of the arch springing line at the arch foot of each arch bridge is uniform. The suspender 2 transmits the load from the main beam 3 upward to the main arch 1. The main beam 3 bears the dead load from the main beam itself and the live load such as vehicles and crowds, and is the main force structure of the arch bridge. The arch column 4 transmits the load from the main beam downward to the main arch 1. The main arch 1 and the main beam 3 are connected as a whole through the suspender 2 and the arch column 4.

[0052] The arch seat 5 bears the load from the main arch 1 and transmits to the foundation, which is mainly used on the lower side of the slope terrain H2>H1, and the arch seat is suitable for the case of higher requirement for the height of the arch seat, and the amount of concrete and steel is relatively low; the solid arch seat 6 bears the load from the main arch 1 and transmits to the foundation, which is mainly used on the higher side of the slope terrain H2>H1. The four arch seats of the arch bridge are flexibly selected according to the size of the ground elevation.

[0053] Embodiment 4 A slope terrain arch bridge based on the cavity-bearing arch seat of embodiment 1 or the arch bridge of embodiment 3, the construction process of which comprises: A1. Constructing the embedded section 501 and the cavity section 502 of the arch seat 5 and the solid section 601 of the solid arch seat 6 in the arch seat foundation pit; A2. Installing 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 pouring the post-cast section 503 of the arch seat 5 and the post-cast section 503 of the solid arch seat 6 with concrete; A3. Pouring the main arch 1; A4. Installing the suspender 2 and the arch column 4; A5. Hoisting the main beam 3.

[0054] Specifically, in the A2 step, when the main arch 1 selects a steel pipe concrete main arch or a steel box main arch, the first section 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, the post-cast section 503 of the arch seat 5 and the post-cast section 503 of the solid arch seat 6 are poured with concrete, and the remaining part of the main arch 1 is hoisted and poured; when the main arch 1 selects a concrete main arch, the steel reinforcement 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, the post-cast section 503 of the arch seat 5 and the post-cast section 503 of the solid arch seat 6 are poured with concrete, and the remaining part of the main arch 1 is cantilever-poured.

[0055] The above only describes the preferred embodiments of the present application and is not used to limit the present application, and any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An arch base, characterized in that, It includes an embedded section (501), a cavity section (502), and a 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 used for the solid connection with the main arch. The embedded section (501) is a solid structure. The cavity section (502) includes a vertical arm (522) and an inclined arm (521). The vertical arm (522), the inclined arm (521), and the embedded section (501) can enclose and form a cavity (523). The embedded section (501), the cavity section (502), and the post-cast section (503) are all reinforced concrete structures.

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

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

4. An arch support 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 support 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 seat 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 support 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 seat, characterized in that, The method for constructing an arch seat as described in claim 7 includes the following steps: S1. Install the reinforcing steel of the arch seat in the arch seat foundation pit and pour it to form the embedded section (501). S2. Install prestressed steel strands (7); S3. Pour concrete into the cavity section (502), and after the concrete reaches the design strength, tension the prestressed steel strands (7). S4. Pour the post-cast section (503) concrete.

9. 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, and it also includes a solid arch seat (6) and an arch seat (5) as described in any of claims 1-7. 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.

10. A construction method for an arch bridge, characterized in that, The method for constructing an arch bridge on sloping terrain as described in claim 9 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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