Circular belly arch bridge and arch bridge construction method

Abstract

The application relates to the technical field of landscape bridges, and discloses a circular-rib arch bridge and an arch bridge construction method, which comprises arch bridge units, each of which comprises an arch bridge main frame and an arch ring assembly arranged above the arch bridge main frame; the arch bridge main frame comprises a first base, curved beam parts symmetrically arranged at two ends of the first base and cross beam parts, one end of each curved beam part is fixedly connected with the first base, the other end is connected with a cross beam part, a bridge deck is arranged between the two cross beam parts, and each cross beam part is provided with a second base for supporting the cross beam part at an end away from the curved beam part along a second direction; and the first base comprises two bearing platforms, and a main arch ring is arranged between the two bearing platforms; the arch ring assembly is symmetrically arranged at two ends of the main arch ring along a first direction, the arch ring assembly comprises a main circular arch and secondary circular arches arranged at two ends of the main circular arch along the first direction, the bottom end of the main circular arch is fixedly connected with the bearing platform, and one end of each secondary circular arch is hingedly connected with the main circular arch.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of landscape bridges, in particular to a circular web arch bridge and a construction method of the arch bridge. BACKGROUND

[0002] A bridge is a structure built to span and provide passage over an obstacle such as a river, valley, or road, for people, vehicles, or a combination of the two. Bridges can be built to carry roads, railways, walkways, or light rail. Bridges are classified into several types according to the way they carry the load, such as beam bridges, arch bridges, steel truss bridges, suspension bridges, and composite bridges. Among them, the arch bridge is the most commonly used bridge type in China, which has many styles and large quantities, especially for highway and municipal bridges.

[0003] At present, the conventional arch bridge in the prior art is mainly supported by a single arch ring structure, but the self-weight of this type of arch bridge is relatively large, which leads to a heavy burden on the lower structure of the arch bridge. The large self-weight also generates a corresponding thrust, further increasing the engineering quantity of the lower structure and the requirement for the foundation condition. Meanwhile, the conventional arch bridge structure is single, which cannot meet the aesthetic requirements of people for landscape bridges. SUMMARY

[0004] The technical problem to be solved by the present application is that in the prior art, the conventional arch bridge has a single support arch ring structure and a relatively large self-weight, which generates a thrust at the pier of the bridge, affecting the service life of the bridge. Meanwhile, the single structure of the arch bridge does not meet the aesthetic requirements of people for landscape bridges.

[0005] To solve the above technical problems, the application provides a circular belly arch bridge, which comprises arch bridge units, each of which comprises an arch bridge main frame and an arch ring assembly arranged above the arch bridge main frame; the arch bridge main frame comprises a first base, curved beam members and cross beam members symmetrically arranged at two ends of the first base in a first direction, one end of each curved beam member is fixedly connected with the first base, the other end is connected with a cross beam member, a bridge deck is arranged between the two cross beam members, each cross beam member is provided with a second base for supporting the cross beam member at an end thereof away from the curved beam member in a second direction, and the first base comprises two bearing platforms arranged at intervals in the first direction, a main arch ring is arranged between the two bearing platforms, one end of the main arch ring is connected with one of the bearing platforms, and the other end is connected with the other bearing platform; the arch ring assembly is symmetrically arranged at two ends of the main arch ring in the first direction, each arch ring assembly comprises a main circular arch and secondary circular arches arranged at two ends of the main circular arch in the first direction, the bottom end of the main circular arch is fixedly connected with the bearing platform, one end of each secondary circular arch is hingedly connected with the main circular arch, and one end of one of the secondary circular arches away from the main circular arch is connected with the curved beam member, and one end of the other secondary circular arch away from the main circular arch is connected with the main arch ring; wherein, the top of the main circular arch, the secondary circular arches and the main arch ring are all provided with arch upper piers extending in the second direction, and each arch upper pier is connected with the bridge deck.

[0006] In an embodiment, the arch bridge unit further comprises a prestressed steel tendon, the prestressed steel tendon is arranged between the two cross beam members in the first direction, and the prestressed steel tendon is connected with the cross beam member, and the prestressed steel tendon is arranged below the bridge deck.

[0007] In an embodiment, the inside of each cross beam member is provided with a tensioning chamber for tensioning the prestressed steel tendon, and the two ends of the prestressed steel tendon are arranged in the tensioning chamber, and a maintenance hole for operators to enter is arranged below the tensioning chamber.

[0008] In an embodiment, a first expansion joint is arranged between the cross beam member and the bridge deck.

[0009] In an embodiment, the first base further comprises a first pile foundation corresponding to the bearing platform, the bearing platform is arranged above the first pile foundation, one end of the first pile foundation is connected with the foundation, and the other end is fixedly connected with the bearing platform.

[0010] In an embodiment, the second base comprises a second pile foundation, a pier platform and an abutment, the pier platform is arranged above the second pile foundation, one end of the second pile foundation is connected with the foundation, and the other end is fixedly connected with the pier platform, the abutment is arranged above the pier platform, the abutment is arranged at an end of the cross beam member away from the bridge deck, and a second expansion joint is arranged between the abutment and the cross beam member.

[0011] In an embodiment, the pier platform is provided with a support member extending in the second direction for supporting the cross beam member.

[0012] In one embodiment, a deflector for adjusting the stress direction of the prestress is arranged in each of the abutment piers, and the prestress steel beam passes through the deflector and is connected with the cross beam.

[0013] In one embodiment, the number of the arch bridge units is multiple, and the multiple arch bridge units are arranged in sequence along the first direction.

[0014] Based on the above-mentioned circular web arch bridge, the application further provides an arch bridge construction method, comprising the following steps:

[0015] Step S1, constructing the first base and the second base in the bridge and installing the support part at the bridge site;

[0016] Step S2, erecting the temporary support, pouring the curved beam part, the cross beam part, the main arch ring and the abutment piers of the main arch ring;

[0017] Step S3, after the concrete strength of the curved beam part, the cross beam part and the main arch ring reaches 90% of the design strength, erecting the temporary support, pouring the main circular arch and the abutment piers of the main circular arch;

[0018] Step S4, after the concrete strength of the main circular arch reaches 90% of the design strength, erecting the temporary support, pouring the secondary circular arch and the abutment piers of the secondary circular arch, arranging the prestress steel beam, and first tensioning the prestress steel beam along the first direction;

[0019] Step S5, installing the bridge deck slab and other bridge auxiliary facilities, and again tensioning the prestress steel beam, removing the temporary support, and operating the vehicle.

[0020] Compared with existing technologies, the circular spandrel arch bridge and its construction method of this invention have the following advantages: 1) The main frame of the arch bridge includes a first base, a second base, curved beams, and crossbeams. During the use of the arch bridge, a portion of the thrust along the first direction is consumed when it passes through the curved beams and crossbeams. The remaining portion of the thrust along the first direction is consumed by the first and second bases when it passes through them. Furthermore, the first base includes two piers spaced apart along the first direction, further improving its thrust-consuming capacity and effectively ensuring the overall stability of the arch bridge structure; 2) The main arch ring and arch ring components are symmetrically arranged along the first direction on both sides of the main arch ring. At the end, the arch assembly includes a main circular arch and secondary circular arches. In practical applications, the downward load along the second direction that the bridge experiences is transferred through the bridge deck to the arch supports, and then to the main arch, main circular arch, and secondary circular arches. Part of the load along the second direction is consumed by the main arch, while the other part is transferred to the main circular arches and secondary circular arches at both ends of the main arch. The design of the main circular arches and secondary circular arches effectively increases the path length for load consumption. Furthermore, the connection design between the secondary circular arches and the curved beams and the main circular arches effectively reduces the static indeterminate degree of the arch bridge structure, further ensuring the overall stability of the arch bridge structure. At the same time, the design of the main arch, main circular arch, and secondary circular arches makes the arch bridge structure beautiful and more in line with people's aesthetic requirements for landscape bridges. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of an embodiment of the present invention.

[0022] Figure 2 This is an enlarged view of a portion of the structure of an embodiment of the present invention.

[0023] Figure 3 This is a schematic diagram of the construction structure in step S1 of the construction process of this embodiment of the invention.

[0024] Figure 4 This is a schematic diagram of the construction structure for steps S2 to S3 in the construction process of an embodiment of the present invention.

[0025] Figure 5 This is a schematic diagram of the construction structure in step S4 of the construction process of this embodiment of the invention.

[0026] Figure 6 This is a schematic diagram of the construction structure in step S5 of the construction process of this embodiment of the invention.

[0027] Figure 7 This is a structural diagram of an embodiment of the present invention after construction is completed.

[0028] In the diagram, 1. Main frame of the arch bridge; 11. First base; 111. Abutment; 112. First pile foundation; 12. Curved beam; 13. Crossbeam; 131. Tensioning chamber; 132. Inspection hole; 14. Second base; 141. Second pile foundation; 142. Pier; 143. Abutment; 144. Bearing; 15. Main arch ring; 16. First expansion joint; 17. Second expansion joint; 2. Arch ring assembly; 21. Main circular arch; 22. Secondary circular arch; 23. Abutment on the arch; 3. Prestressed steel strands; 4. Bridge deck; 100. Arch bridge unit. Detailed Implementation

[0029] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0030] In the description of this invention, it should be understood that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on or indirectly on that other element. When an element is referred to as being "connected to" another element, it can be directly connected to or indirectly connected to that other element. The terms "mounted," "connected," and "attached" should be interpreted broadly, for example, referring to a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements or an interaction between two elements. Those skilled in the art will understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0031] In the description of this invention, it should be understood that the terms "height," "upper," "lower," "vertical," "horizontal," "top," "bottom," "inner," and "outer" used in this invention to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0032] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0033] like Figures 1 to 7As shown, a preferred embodiment of the present invention provides a circular spandrel arch bridge, which includes arch bridge units 100. Each arch bridge unit 100 includes an arch bridge main frame 1 and an arch ring assembly 2 disposed above the arch bridge main frame 1. The arch bridge main frame 1 includes a first base 11 and curved beam members 12 and crossbeam members 13 symmetrically disposed at both ends of the first base 11 along a first direction. One end of the curved beam member 12 is fixedly connected to the first base 11, and the other end is connected to the crossbeam member 13. A bridge deck 4 is provided between the two crossbeam members 13. A second base 14 for supporting the crossbeam member 13 is provided at the end of each crossbeam member 13 away from the curved beam member 12 along a second direction. The first base 11 includes two abutments 111 spaced apart along the first direction. A main arch ring 15 is disposed between the two abutments 111. One end of the main arch ring 15 is connected to one of the piers 111, and the other end is connected to another pier 111. The arch ring assembly 2 is symmetrically arranged at both ends of the main arch ring 15 along the first direction. Each arch ring assembly 2 includes a main arch 21 and secondary arches 22 respectively arranged at both ends of the main arch 21 along the first direction. The bottom end of the main arch 21 is fixedly connected to the pier 111. One end of each secondary arch 22 is hinged to the main arch 21. One end of one secondary arch 22 away from the main arch 21 is connected to the curved beam 12, and the other end of the secondary arch 22 away from the main arch 21 is connected to the main arch ring 15. The main arch 21, the secondary arches 22 and the main arch ring 15 are all provided with arch supports 23 extending along the second direction. Each arch support 23 is connected to the bridge deck 4.

[0034] Based on the above technical features, this embodiment of the invention, through the arrangement of the main frame 1 of the arch bridge, includes a first base 11, a second base 14, a curved beam 12, and a crossbeam 13. During the use of the arch bridge, a portion of the thrust along the first direction is consumed when passing through the curved beam 12 and the crossbeam 13, while the remaining portion of the thrust along the first direction is consumed by the first base 11 and the second base 14. Simultaneously, the first base 11 includes two abutments 111 spaced apart along the first direction, further improving the thrust consumption capacity of the first base 11 and effectively ensuring the stability of the overall arch bridge structure. Through the arrangement of the main arch ring 15 and the arch ring assembly 2, the arch ring assembly 2 is symmetrically arranged at both ends of the main arch ring 15 along the first direction. The arch ring assembly 2 includes... In practical applications, the downward load along the second direction experienced by the main arch 21 and the secondary arch 22 is transmitted through the bridge deck 4 to the arch support 23, and then to the main arch ring 15, the main arch 21, and the secondary arch 22. Part of the load along the second direction is consumed by the main arch ring 15, while the other part is transmitted to the main arch 21 and the secondary arch 22 at both ends of the main arch ring 15. The design of the main arch 21 and the secondary arch 22 effectively increases the path length for load consumption. Through the connection design between the secondary arch 22 and the curved beam 12 and the main arch, the static indeterminacy of the arch bridge structure is effectively reduced, further ensuring the overall stability of the arch bridge structure. At the same time, the design of the main arch ring 15, the main arch 21, and the secondary arch 22 makes the arch bridge structure beautiful and more in line with people's aesthetic requirements for landscape bridges.

[0035] As some embodiments of the present invention, such as Figure 1 As shown, the arch bridge unit 100 also includes prestressed steel strands 3, which are arranged between two crossbeam members 13 along a first direction and connected to the crossbeam members 13. The prestressed steel strands 3 are located below the bridge deck 4. Through the arrangement of the prestressed steel strands 3, the curved beam members 12 of the left and right side spans, the main arch ring 15 of the middle span, the longitudinal prestressed steel strands 3, and the crossbeam members 13 held together by the prestressed steel strands 3 form a self-stable structural system. The arrangement of the prestressed steel strands 3 can be optimized according to the stress characteristics of the structure, so that the stress can be distributed more evenly when the entire structure is subjected to external loads, thereby improving the overall performance of the structure.

[0036] As some embodiments of the present invention, such as Figure 1As shown, each crossbeam 13 is equipped with a tensioning chamber 131 for tensioning the prestressed steel strands 3. Both ends of the prestressed steel strands 3 are respectively located within the tensioning chamber 131. A maintenance opening 132 for personnel access is located below the tensioning chamber 131. The tensioning chamber 131 allows workers to not only tension the prestressed steel strands 3 as needed during bridge construction, thereby adjusting the strength of the prestress generated by the prestressed steel strands 3, but also to access the tensioning chamber 131 through the maintenance opening 132 at any time during bridge operation to inspect, repair, or replace the prestressed steel strands 3, further ensuring the overall stability of the arch bridge under prestress.

[0037] As some embodiments of the present invention, such as Figures 1 to 2 As shown, a first expansion joint 16 is provided between the crossbeam 13 and the bridge deck 4. The first expansion joint 16 provides expansion space between the crossbeam and the bridge deck 4, allowing the crossbeam to expand and contract freely, reducing the stress on the crossbeam, and thus ensuring the stability of the main frame 1 of the arch bridge.

[0038] As some embodiments of the present invention, such as Figures 1 to 2 As shown, the first base 11 also includes first pile foundations 112 corresponding to the pier cap 111. The pier cap 111 is located above the first pile foundations 112. One end of the first pile foundation 112 is connected to the foundation, and the other end is fixedly connected to the pier cap 111. Through the first pile foundations 112 extending deep into the foundation and fixedly connected to the pier cap 111, the first pile foundations 112 can enhance the stability of the entire arch bridge main frame 1 in the first and second directions, preventing excessive deformation or overturning of the structure when subjected to external loads. At the same time, the firm connection and joint force sharing between the first pile foundations 112 and the pier cap 111 significantly improve the load-bearing capacity of the entire arch bridge main frame 1.

[0039] As some embodiments of the present invention, such as Figures 1 to 2As shown, the second base 14 includes a second pile foundation 141, a pier 142, and a bridge abutment 143. The pier 142 is located above the second pile foundation 141. One end of the second pile foundation 141 is connected to the foundation, and the other end is fixedly connected to the pier 142. The bridge abutment 143 is located above the pier 142. The bridge abutment 143 is located at the end of the crossbeam 13 away from the bridge deck 4, and a second expansion joint 17 is provided between the bridge abutment 143 and the crossbeam 13. The second pile foundation 141 is the main connecting component between the second base 14 and the foundation. It is responsible for effectively transferring the loads from the pier 142, abutment 143 and crossbeam 13 to the foundation. The pier 142 is the transition part between the second pile foundation 141 and the abutment 143. It supports the abutment 143 and transfers the load to the second pile foundation 141. The abutment 143 is an important component connecting the crossbeam 13 and the pier 142. It supports one end of the crossbeam 13. At the same time, the setting of the second expansion joint 17 allows the end of the crossbeam 13 near the abutment 143 to undergo a certain amount of expansion and contraction deformation under conditions such as temperature changes and load action.

[0040] As some embodiments of the present invention, such as Figures 1 to 2 As shown, a support member 144 extending in the second direction is provided on the pier 142 to support the crossbeam member 13. The support member 144 provides a supporting force in the second direction to the crossbeam member 13, thereby ensuring the supporting effect of the second base 14 on the crossbeam member 13, so that the bridge deck 4 can bear the load. When it generates pressure in the second direction, the second base 14 can disperse part of the load, thereby ensuring the structural strength of the bridge deck 4.

[0041] Furthermore, the support member 144 is a sliding support, and the bottom end of the crossbeam member 13 is connected to the pier 142 through the sliding support, so that the end where the curved beam member 12 and the crossbeam member 13 are connected does not generate a bending moment, but only generates a vertical force and a small horizontal force, thus making the design of the pier 142 easier to realize.

[0042] As some embodiments of the present invention, such as Figures 1 to 2 As shown, each arch abutment 23 is equipped with a deflector for adjusting the direction of prestressing force, and the prestressed steel strands 3 pass through the deflector and connect to the crossbeam 13. The deflector, located within the arch abutment 23, primarily functions to adjust the direction of force on the prestressed steel strands 3. Due to the complexity of the arch bridge structure, the prestressed steel strands 3 may need to be arranged in different directions to meet the stress requirements. The deflector ensures that the prestressed steel strands 3 can smoothly change direction when passing through the abutment, thereby effectively transferring prestress.

[0043] As some embodiments of the present invention, there are multiple arch bridge units 100, and the multiple arch bridge units 100 are arranged sequentially along a first direction. By setting multiple arch bridge units 100, the user can adjust the number of arch bridge units 100 according to the length of the bridge and actual needs, ensuring that the circular spandrel arch bridge has high stability while improving the application range of the circular spandrel arch bridge.

[0044] As some embodiments of the present invention, such as Figures 3 to 7 As shown, the present invention also provides a method for constructing an arch bridge, comprising the following steps:

[0045] Step S1: Construct the first base 11 and the second base 14 of the bridge at the bridge site and install the support component 144; During the construction of the arch bridge, the construction personnel first confirm the length of the circular web arch bridge, and before construction, in conjunction with the drawings, clarify the specific range requirements between the first base 11 and the second base 14, and construct the first base 11 and the second base 14 that meet the regulations.

[0046] Step S2: Erect temporary supports and pour the curved beam 12, crossbeam 13, main arch ring 15 and the arch support 23 of the main arch ring 15; Erect temporary supports and conduct overload pre-stress test on the temporary supports. Construction workers pour the curved beam 12 and crossbeam 13 on the temporary supports.

[0047] Step S3: After the concrete strength of the curved beam 12, the crossbeam 13 and the main arch ring 15 reaches 90% of the design strength, a temporary support is erected, and the main circular arch 21 and the arch support 23 of the main circular arch 21 are poured. After the construction personnel test the structural strength of the curved beam 12 and the crossbeam 13, the temporary support is erected again, and an overload pre-stress test is conducted on the temporary support. After the test is completed, the construction personnel pour the main circular arch 21 and the arch support 23 of the main circular arch 21 on the temporary support.

[0048] Step S4: After the concrete strength of the main arch 21 reaches 90% of the design strength, a temporary support is erected, the secondary arch 22 and the arch support 23 of the secondary arch 22 are poured, the prestressed steel strands 3 are laid, and the prestressed steel strands 3 are tensioned for the first time in the first direction. After the construction personnel test the structural strength of the main arch 21, the temporary support is erected again, and the overload pre-stress test is carried out on the temporary support. After the test is completed, the construction personnel pour the secondary arch 22 and the arch support 23 of the secondary arch 22 on the temporary support, and lay the prestressed steel strands 3. At the same time, the construction personnel tension the prestressed steel strands 3 for the first time in the tensioning chamber 131 in the first direction.

[0049] Step S5: Install bridge deck 4 and other bridge ancillary facilities, and re-tension the prestressed steel strands 3. Remove the temporary supports and open the bridge to traffic. The second tensioning of the prestressed steel strands 3 during the later stages of arch bridge construction overcomes the new internal loads that appeared after the first tensioning operation. This further effectively ensures a more uniform stress distribution throughout the circular spandrel arch bridge. In other words, multiple tensioning operations result in uniform stress distribution within the concrete material, improving the overall structural stability of the circular spandrel arch bridge.

[0050] In summary, the circular spandrel arch bridge and its construction method provided by this invention offer the following advantages compared to existing technologies: 1) The main frame 1 of the arch bridge includes a first base 11, a second base 14, a curved beam 12, and a crossbeam 13. During the use of the arch bridge, a portion of the thrust along the first direction is consumed when it passes through the curved beam 12 and the crossbeam 13. The remaining portion of the thrust along the first direction is consumed by the first base 11 and the second base 14 when they pass through them. Furthermore, the first base 11 includes two piers 111 spaced apart along the first direction, further enhancing its thrust-consuming capacity and effectively ensuring the overall stability of the arch bridge structure; 2) The main arch ring 15 and the arch ring assembly 2 are symmetrically arranged along the first direction on the main arch ring 15. At both ends, the arch ring assembly 2 includes a main circular arch 21 and a secondary circular arch 22. In practical applications, the downward load along the second direction that the bridge experiences is transmitted through the bridge deck 4 to the arch support 23, and then to the main arch ring 15, the main circular arch 21, and the secondary circular arch 22. Part of the load along the second direction is consumed by the main arch ring 15, and the other part of the load along the second direction is transmitted to the main circular arch 21 and the secondary circular arch 22 at both ends of the main arch ring 15. The design of the main circular arch 21 and the secondary circular arch 22 effectively increases the path length for consuming the load. Through the connection design between the secondary circular arch 22 and the curved beam 12 and the main circular arch 21, the static indeterminate degree of the arch bridge structure is greatly reduced, further ensuring the stability of the overall arch bridge structure. At the same time, the design of the main arch ring 15, the main circular arch 21, and the secondary circular arch 22 makes the arch bridge structure beautiful and more in line with people's aesthetic requirements for landscape bridges.

[0051] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A circular spandrel arch bridge, characterized in that, It includes arch bridge units, each of which includes an arch bridge main frame and an arch ring assembly disposed above the arch bridge main frame; The main frame of the arch bridge includes a first base and curved beams and crossbeams symmetrically arranged at both ends of the first base along a first direction. One end of the curved beam is fixedly connected to the first base, and the other end is connected to the crossbeam. A bridge deck is erected between the two crossbeams. Each crossbeam has a second base for supporting it along a second direction at the end away from the curved beam. The first base includes two piers spaced apart along the first direction. A main arch is arranged between the two piers. One end of the main arch is connected to one of the piers, and the other end is connected to the other pier. The arch ring components are symmetrically arranged at both ends of the main arch ring along the first direction. Each arch ring component includes a main arch and secondary arches respectively arranged at both ends of the main arch along the first direction. The bottom end of the main arch is fixedly connected to the pier. One end of each secondary arch is hinged to the main arch. One of the secondary arches is connected to the curved beam member at the end opposite to the main arch, and the other secondary arch is connected to the main arch ring at the end opposite to the main arch. The main arch, the secondary arch, and the main arch ring are all provided with arch supports extending in the second direction. Each arch support is connected to the bridge deck. The downward load on the bridge in the second direction is transmitted to the arch supports via the bridge deck, and then to the main arch ring, the main arch, and the secondary arch. Part of the load in the second direction is consumed by the main arch ring, and the other part of the load in the second direction is transmitted to the main arch and the secondary arch at both ends of the main arch ring.

2. The circular spandrel arch bridge according to claim 1, characterized in that, The arch bridge unit also includes prestressed steel strands, which are arranged between the two crossbeam members along a first direction and connected to the crossbeam members. The prestressed steel strands are located below the bridge deck.

3. The circular spandrel arch bridge according to claim 2, characterized in that, Each of the aforementioned beams is provided with a tensioning chamber for tensioning prestressed steel strands. Both ends of the prestressed steel strands are respectively located in the tensioning chambers, and an inspection hole for operators to enter is provided below the tensioning chambers.

4. The circular spandrel arch bridge according to claim 2, characterized in that, A first expansion joint is provided between the crossbeam and the bridge deck.

5. The circular spandrel arch bridge according to claim 2, characterized in that, The first base also includes a first pile foundation that corresponds one-to-one with the pier. The pier is located above the first pile foundation. One end of the first pile foundation is connected to the ground, and the other end is fixedly connected to the pier.

6. The circular spandrel arch bridge according to claim 5, characterized in that, The second base includes a second pile foundation, a pier, and a bridge abutment. The pier is located above the second pile foundation. One end of the second pile foundation is connected to the ground, and the other end is fixedly connected to the pier. The bridge abutment is located above the pier and is located at the end of the crossbeam that is away from the bridge deck. A second expansion joint is provided between the bridge abutment and the crossbeam.

7. The circular spandrel arch bridge according to claim 6, characterized in that, The pier is provided with a support member extending in the second direction to support the crossbeam.

8. The circular spandrel arch bridge according to claim 2, characterized in that, Each of the arch support piers is equipped with a steering device for adjusting the direction of prestressing force, and the prestressing steel strands pass through the steering device and are connected to the crossbeam.

9. The circular spandrel arch bridge according to claim 2, characterized in that, The number of arch bridge units is multiple, and the multiple arch bridge units are arranged sequentially along the first direction.

10. A method for constructing an arch bridge based on any one of claims 2-9, characterized in that, Includes the following steps: Step S1: Construct the first and second bases of the bridge at the bridge site and install the support components; Step S2: Erect temporary supports and pour the curved beams, crossbeams, main arch rings and the arch supports of the main arch rings; Step S3: After the concrete strength of the curved beam, cross beam and main arch ring reaches 90% of the design strength, erect temporary supports and pour the main arch and the arch support piers of the main arch. Step S4: After the concrete strength of the main arch reaches 90% of the design strength, a temporary support is erected, the secondary arch and the arch support of the secondary arch are poured, the prestressed steel strands are laid, and the prestressed steel strands are tensioned for the first time along the first direction. Step S5: Install the bridge deck and other bridge ancillary facilities, re-tension the prestressed steel strands, remove the temporary supports, and open the bridge to traffic.

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