Round web arch bridge and arch bridge construction method

Abstract

The invention relates to the technical field of landscape bridges, and discloses a circular web arch bridge and an arch bridge construction method.The circular web arch bridge comprises arch bridge units, and each arch bridge unit 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 pieces and cross beam pieces, the curved beam pieces and the cross beam pieces are symmetrically arranged at the two ends of the first base, one ends of the curved beam pieces are fixedly connected with the first base, and the other ends of the curved beam pieces are connected with the cross beam pieces. A second base used for supporting the cross beam piece is arranged at the end, away from the curved beam piece, of each cross beam piece in the second direction, the first base comprises two bearing platforms, and a main arch ring is arranged between the two bearing platforms; the arch ring assemblies are symmetrically arranged at the 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 the 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, and one end of each secondary circular arch is hinged to the main circular arch.

Description

Technical Field

[0001] The invention relates to the technical field of landscape bridges, and in particular to a circular belly-arch bridge and an arch bridge construction method. Background Art

[0002] A bridge is a structure built for roads, railways or pedestrian paths to cross rivers, lakes, valleys, canyons or other roads. Bridges are composed of many components, including span structures, bridge support systems, piers, abutments, caps, pile foundations, bridge deck pavement, drainage systems, railings, expansion joints, lighting, etc. There are many types of bridges, which are mainly divided into beam bridges, arch bridges, steel frame bridges, suspension bridges, combined system bridges, etc. according to their force characteristics. Among them, arch bridges are the most commonly used type of bridge in my country, with many styles and large numbers, especially for highway and municipal bridges.

[0003] At present, conventional arch bridges in the prior art mostly support the bridge by setting a single arch ring structure. However, this type of arch bridge has a relatively large deadweight, which causes a heavy burden on the lower structure of the arch bridge. The large deadweight will also generate corresponding thrust, further increasing the engineering workload of the lower structure and the requirements for foundation conditions. At the same time, the conventional arch bridge has a single structure and cannot meet people's aesthetic requirements for landscape bridges. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in the prior art, conventional arch bridges have a single supporting arch ring structure and a relatively large deadweight, which causes thrust to be generated at the piers of the bridge, affecting the service life of the bridge; at the same time, this single-structure arch bridge does not meet people's aesthetic requirements for landscape bridges.

[0005] In order to solve the above technical problems, the present invention provides a circular belly arch bridge, which includes an arch bridge unit, each arch bridge unit includes an arch bridge main frame and an arch ring assembly arranged above the arch bridge main frame; the arch bridge main frame includes a first base and a curved beam and a cross beam 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 cross beam, a bridge deck is arranged between the two cross beams, a second base for supporting the cross beam is arranged at one end of each cross beam away from the curved beam along the second direction, and the first base includes two pedestals arranged at intervals along the first direction, and a main arch ring is arranged between the two pedestals. One end of the main arch ring is connected to one of the pedestals, and the other end is connected to the other pedestal; the arch ring components are symmetrically arranged at the two ends of the main arch ring along the first direction, and each arch ring component includes a main round arch and secondary round arches respectively arranged at the two ends of the main round arch along the first direction, the bottom end of the main round arch is fixedly connected to the pedestal, one end of each secondary round arch is hinged to the main round arch, and one end of one secondary round arch away from the main round arch is connected to the curved beam member, and the other end of the other secondary round arch away from the main round arch is connected to the main arch ring; wherein, the arch tops of the main round arch, the secondary round arch and the main arch ring are all provided with arch piers extending along the second direction, and each arch pier is connected to the bridge deck.

[0006] In one embodiment, the arch bridge unit further includes a prestressed steel bundle, which is arranged between two cross beams along a first direction and connected to the cross beams, and is arranged below the bridge deck.

[0007] In one embodiment, a tensioning chamber for tensioning the prestressed steel strands is disposed inside each cross beam, both ends of the prestressed steel strands are disposed in the tensioning chambers respectively, and an inspection hole for operators to enter is disposed below the tensioning chambers.

[0008] In one embodiment, a first expansion joint is provided between the cross beam and the bridge deck.

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

[0010] In one embodiment, the second base includes a second pile foundation, a pier and a bridge abutment, the pier is arranged above the second pile foundation, one end of the second pile foundation is connected to the foundation, and the other end is fixedly connected to the pier, the bridge abutment is arranged above the pier, the bridge abutment is arranged at one end of the crossbeam member away from the bridge deck, and a second expansion joint is arranged between the bridge abutment and the crossbeam member.

[0011] In one embodiment, a support member extending along the second direction for supporting the crossbeam member is disposed on the pier.

[0012] In one embodiment, a deflector for adjusting the direction of prestressing force is provided in each arch pier, and the prestressed steel strand passes through the deflector and is connected to the cross beam.

[0013] In one embodiment, there are multiple arch bridge units, and the multiple arch bridge units are arranged sequentially along the first direction.

[0014] Based on the above circular belly arch bridge, the present invention also provides an arch bridge construction method, comprising the following steps:

[0015] Step S1, constructing a first base and a second base in the bridge at the bridge location, and installing bearing members;

[0016] Step S2, setting up temporary supports, casting curved beams, cross beams, main arch rings and arch buttresses of the main arch rings;

[0017] Step S3, after the concrete strength of the curved beam, the cross beam and the main arch ring reaches 90% of the design strength, a temporary support is set up to cast the main round arch and the arch piers of the main round arch;

[0018] Step S4, after the concrete strength of the main arch reaches 90% of the design strength, a temporary support is set up, the secondary arch and the arch pier of the secondary arch are cast, the prestressed steel strands are arranged, and the prestressed steel strands are tensioned for the first time along the first direction;

[0019] Step S5: Install the bridge deck and other bridge ancillary facilities, tension the prestressed steel strands again, remove the temporary supports, and open the bridge to traffic.

[0020] Compared with the prior art, the circular belly arch bridge and the arch bridge construction method of the embodiment of the present invention have the following beneficial effects: 1) The arch bridge main frame, which includes a first base, a second base, a curved beam and a cross beam. During the use of the arch bridge, a part of the thrust along the first direction received by it is consumed when passing through the curved beam and the cross beam, and the other part of the thrust along the first direction is consumed by the first base and the second base when passing through the first base and the second base. At the same time, the first base includes two pedestals arranged at intervals along the first direction, which further improves the thrust consumption capacity of the first base and effectively ensures the stability of the overall structure of the arch bridge; 2) The main arch ring and the arch ring assembly, the arch ring assembly is symmetrically arranged on both sides of the main arch ring along the first direction. At the end, the arch ring assembly includes a main round arch and a secondary round arch. In actual application, the downward load along the second direction received by the bridge is transmitted to the arch pier through the bridge deck, and then transmitted to the main arch ring, the main round arch and the secondary round arch. A part of the load along the second direction is consumed by the main arch ring, and the other part of the load along the second direction is transmitted to the main round arch and the secondary round arch at both ends of the main arch ring. The design of the main round arch and the secondary round arch effectively increases the path length for consuming the load, and through the connection design of the secondary round arch, the curved beam and the main round arch, the hyperstatic number of the arch bridge structure is effectively reduced, further ensuring the stability of the overall structure of the arch bridge. At the same time, the design of the main arch ring, the main round arch and the secondary round arch makes the arch bridge structure beautiful, which is more in line with people's aesthetic requirements for landscape bridges. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0022] Figure 2 It is an enlarged view of part of the structure of an embodiment of the present invention.

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

[0024] Figure 4 It is a schematic diagram of the construction structure from step S2 to step S3 in the construction process of an embodiment of the present invention.

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

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

[0027] Figure 7 It is a schematic diagram of the structure after the construction of the embodiment of the present invention is completed.

[0028] In the figure, 1, main frame of arch bridge; 11, first base; 111, pedestal; 112, first pile foundation; 12, curved beam; 13, cross beam; 131, tensioning chamber; 132, inspection hole; 14, second base; 141, second pile foundation; 142, pier; 143, abutment; 144, support member; 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, arch pier; 3, prestressed steel strand; 4, bridge deck; 100, arch bridge unit. DETAILED DESCRIPTION

[0029] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0030] In the description of the present invention, it should be understood that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0031] In the description of the present invention, it should be understood that the terms "height", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

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

[0033] like Figures 1 to 7As shown, an embodiment of the present invention preferably provides a circular belly arch bridge, which includes an arch bridge unit 100, each arch bridge unit 100 includes an arch bridge main frame 1 and an arch ring assembly 2 arranged above the arch bridge main frame 1; the arch bridge main frame 1 includes a first base 11 and a curved beam 12 and a cross beam 13 symmetrically arranged at both ends of the first base 11 along a first direction, one end of the curved beam 12 is fixedly connected to the first base 11, and the other end is connected to the cross beam 13, a bridge deck 4 is arranged between the two cross beams 13, and a second base 14 for supporting the cross beam 13 is arranged at one end of each cross beam 13 away from the curved beam 12 along the second direction, and the first base 11 includes two pedestals 111 spaced apart along the first direction, a main arch ring 15 is arranged between the two pedestals 111, and the main arch One end of the ring 15 is connected to one of the pedestals 111, and the other end is connected to the other pedestal 111; the arch ring components 2 are symmetrically arranged at the two ends of the main arch ring 15 along the first direction, and each arch ring component 2 includes a main round arch 21 and secondary round arches 22 respectively arranged at the two ends of the main round arch 21 along the first direction, the bottom end of the main round arch 21 is fixedly connected to the pedestal 111, one end of each secondary round arch 22 is hinged to the main round arch 21, and one end of the secondary round arch 22 away from the main round arch 21 is connected to the curved beam member 12, and the other end of the secondary round arch 22 away from the main round arch 21 is connected to the main arch ring 15; wherein, the arch tops of the main round arch 21, the secondary round arch 22 and the main arch ring 15 are all provided with arch piers 23 extending along the second direction, and each arch pier 23 is connected to the bridge deck 4.

[0034] Based on the above technical features, the embodiment of the present invention is provided with an arch bridge main frame 1, wherein the arch bridge main frame 1 includes a first base 11, a second base 14, a curved beam 12 and a cross beam 13. During the use of the arch bridge, a part of the thrust along the first direction received by the arch bridge is consumed when passing through the curved beam 12 and the cross beam 13, and the other part of the thrust along the first direction is consumed by the first base 11 and the second base 14 when passing through the first base 11 and the second base 14. At the same time, the first base 11 includes two pedestals 111 arranged at intervals along the first direction, which further improves the thrust consumption capacity of the first base 11 and effectively ensures the stability of the overall structure of the arch bridge; through the provision 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, and the arch ring assembly 2 includes The main round arch 21 and the secondary round arch 22, in actual application, the downward load along the second direction received by the bridge is transmitted to the arch pier 23 through the bridge deck 4, and then transmitted to the main arch ring 15, the main round arch 21 and the secondary round arch 22. A 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 round arch 21 and the secondary round arch 22 at both ends of the main arch ring 15. The design of the main round arch 21 and the secondary round arch 22 effectively increases the path length for consuming the load, and through the connection design of the secondary round arch 22 with the curved beam 12 and the main round arch, the hyperstatic number of the arch bridge structure is effectively reduced, further ensuring the stability of the overall structure of the arch bridge. At the same time, the design of the main arch ring 15, the main round arch 21 and the secondary round 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, Figure 1 As shown, the arch bridge unit 100 also includes a prestressed steel bundle 3, which is arranged between two cross beams 13 along a first direction, and the prestressed steel bundle 3 is connected to the cross beam 13, and the prestressed steel bundle 3 is arranged below the bridge deck 4. Through the arrangement of the prestressed steel bundle 3, the curved beams 12 of the left and right side spans, the main arch ring 15 of the middle span, the longitudinal prestressed steel bundle 3, and the cross beam 13 pulled together by the prestressed steel bundle 3 form a self-stable structural system, and the arrangement of the prestressed steel bundle 3 can be optimized according to the stress characteristics of the structure, so that the entire structure can distribute stress more evenly when subjected to external loads, thereby improving the overall performance of the structure.

[0036] As some embodiments of the present invention, Figure 1As shown, each cross beam 13 is provided with a tensioning chamber 131 for tensioning the prestressed steel strand 3, and both ends of the prestressed steel strand 3 are respectively provided in the tensioning chamber 131, and a manhole 132 for operators to enter is provided below the tensioning chamber 131. Through the provision of the tensioning chamber 131, the staff can not only perform tensioning operations on the prestressed steel strand 3 according to actual needs during the bridge construction, and then adjust the strength of the prestress generated by the prestressed steel strand 3, but also can enter the tensioning chamber 131 through the manhole 132 at any time during the operation of the bridge to inspect, repair or replace the prestressed steel strand 3, further ensuring the stability of the arch bridge as a whole in bearing prestress.

[0037] As some embodiments of the present invention, Figure 1 to Figure 2 As shown, a first expansion joint 16 is provided between the cross beam 13 and the bridge deck 4. The first expansion joint 16 provides an expansion space between the cross beam and the bridge deck 4, so that the cross beam can be freely expanded and contracted, reducing the stress on the cross beam, thereby ensuring the stability of the arch bridge main frame 1.

[0038] As some embodiments of the present invention, Figure 1 to Figure 2 As shown, the first base 11 also includes a first pile foundation 112 arranged in a one-to-one correspondence with the cap 111, the cap 111 is arranged above the first pile foundation 112, one end of the first pile foundation 112 is connected to the foundation, and the other end is fixedly connected to the cap 111. Through the first pile foundation 112 that penetrates deep into the foundation, the first pile foundation 112 is fixedly connected to the cap 111, and the first pile foundation 112 can enhance the stability of the entire arch bridge main frame 1 in the first direction and the second direction, and prevent the structure from being excessively deformed or overturned when subjected to external loads. At the same time, the first pile foundation 112 is firmly connected to the cap 111 and bears force together, so that the bearing capacity of the entire arch bridge main frame 1 is significantly improved.

[0039] As some embodiments of the present invention, Figure 1 to Figure 2As shown, the second base 14 includes a second pile foundation 141, a pier 142 and a bridge abutment 143. The pier 142 is arranged 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 arranged above the pier 142. The bridge abutment 143 is arranged at one end of the cross beam 13 away from the bridge deck 4, and a second expansion joint 17 is arranged between the bridge abutment 143 and the cross beam 13. The second pile foundation 141 is the main connecting component between the second base 14 and the foundation, and is responsible for effectively transferring the loads from the pier 142, the abutment 143 and the cross beam 13 to the foundation. The pier 142 is the transition part between the second pile foundation 141 and the abutment 143, and it supports the abutment 143 and transfers the load to the second pile foundation 141. The abutment 143 is an important component connecting the cross beam 13 and the pier 142, and it supports one end of the cross beam 13. At the same time, the setting of the second expansion joint 17 allows the end of the cross beam 13 close to the abutment 143 to produce a certain expansion and contraction deformation under the conditions of temperature change, load, etc.

[0040] As some embodiments of the present invention, Figure 1 to Figure 2 As shown, a support member 144 extending in the second direction for supporting the cross beam 13 is provided on the pier 142. Through the provision of the support member 144, a supporting force is provided to the cross beam 13 in the second direction, thereby ensuring the supporting effect of the second base 14 on the cross beam 13, so that when the bridge deck 4 is subjected to a load and generates pressure in the second direction, a part of the load can be dispersed through the second base 14, 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 cross beam member 13 is connected to the pier 142 through the sliding support, so that no bending moment is generated at the end where the curved beam member 12 and the cross beam member 13 are connected, and only vertical force and a smaller horizontal force are generated, thereby making the design of the pier 142 easier to implement.

[0042] As some embodiments of the present invention, Figure 1 to Figure 2 As shown, each arch pier 23 is provided with a deflector for adjusting the force direction of the prestress, and the prestressed steel bundle 3 passes through the deflector and is connected to the cross beam 13. The deflector is arranged in the arch pier 23, and its main function is to adjust the force direction of the prestressed steel bundle 3. Due to the complex structure of the arch bridge, the prestressed steel bundle 3 may need to be arranged in different directions to meet the force requirements. The deflector can ensure that the prestressed steel bundle 3 can change direction smoothly when passing through the pier, thereby effectively transmitting the 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 in sequence along the first direction. Through the arrangement of 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, thereby ensuring that the circular belly arch bridge has high stability and increasing the scope of use of the circular belly arch bridge.

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

[0045] Step S1, construct the first base 11 and the second base 14 of the bridge at the bridge position, and install the support member 144; during the construction of the arch bridge, the construction personnel first confirm the length of the circular arch bridge, and before construction, combine the drawings to 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 requirements.

[0046] Step S2, erecting a temporary support, casting the curved beam 12, the cross beam 13, the main arch ring 15 and the arch pier 23 of the main arch ring 15; erecting a temporary support, and performing an overload preload test on the temporary support, and the construction personnel cast the curved beam 12 and the cross beam 13 on the temporary support.

[0047] Step S3, after the concrete strength of the curved beam 12, the cross beam 13 and the main arch ring 15 reaches 90% of the design strength, set up a temporary support and cast the main round arch 21 and the arch pier 23 of the main round arch 21; after the construction personnel test the structural strength of the curved beam 12 and the cross beam 13, set up a temporary support again and perform an overload preload test on the temporary support. The construction personnel cast the main round arch 21 and the arch pier 23 of the main round arch 21 on the temporary support after the test.

[0048] Step S4, after the concrete strength of the main arch 21 reaches 90% of the design strength, set up a temporary support, cast the secondary arch 22 and the arch pier 23 of the secondary arch 22, lay out the prestressed steel bundle 3, and tension the prestressed steel bundle 3 for the first time along the first direction; after the construction personnel test the structural strength of the main arch 21, set up a temporary support again, and perform an overload preload test on the temporary support. The construction personnel cast the secondary arch 22 and the arch pier 23 of the secondary arch 22 on the temporary support after the test, and lay out the prestressed steel bundle 3. At the same time, the construction personnel tension the prestressed steel bundle 3 for the first time along the first direction in the tensioning chamber 131.

[0049] Step S5, install the bridge deck 4 and other bridge ancillary facilities, and tension the prestressed steel bundle 3 again, remove the temporary support, and put the bridge into operation. In the later stage of the arch bridge construction, the construction workers perform the second tensioning of the prestressed steel bundle 3, which overcomes the new load inside the arch bridge after the first tensioning operation, and further effectively ensures that the stress distribution of each part of the circular arch bridge is more uniform, that is, multiple tensioning operations make the concrete material uniformly stressed, and improve the stability of the overall structure of the circular arch bridge.

[0050] In summary, the embodiments of the present invention provide a circular belly arch bridge and an arch bridge construction method, which have the following beneficial effects compared with the prior art: 1) an arch bridge main frame 1, the arch bridge main frame 1 includes a first base 11, a second base 14, a curved beam 12 and a cross beam 13. During the use of the arch bridge, a part of the thrust along the first direction is consumed when passing through the curved beam 12 and the cross beam 13, and the other part of the thrust along the first direction is consumed by the first base 11 and the second base 14 when passing through the first base 11 and the second base 14. At the same time, the first base 11 includes two pedestals 111 spaced apart along the first direction, which further improves the thrust consumption capacity of the first base 11 and effectively ensures the stability of the overall structure of the arch bridge; 2) a main arch ring 15 and an arch ring assembly 2, the arch ring assembly 2 is symmetrically arranged on the main arch ring 15 along the first direction. At both ends, the arch ring assembly 2 includes a main round arch 21 and a secondary round arch 22. In actual application, the downward load along the second direction received by the bridge is transmitted to the arch pier 23 via the bridge deck 4, and then transmitted to the main arch ring 15, the main round arch 21 and the secondary round arch 22. A 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 round arch 21 and the secondary round arch 22 at both ends of the main arch ring 15. The design of the main round arch 21 and the secondary round arch 22 effectively increases the path length for consuming the load, and through the connection design of the secondary round arch 22 with the curved beam 12 and the main round arch 21, the hyperstatic number of the arch bridge structure is greatly reduced, further ensuring the stability of the overall structure of the arch bridge. At the same time, the design of the main arch ring 15, the main round arch 21 and the secondary round arch 22 makes the arch bridge structure beautiful and more in line with people's aesthetic requirements for landscape bridges.

[0051] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A circular belly arch bridge, characterized in that: It 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 and a curved beam and a cross beam symmetrically arranged at two 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 cross beam, a bridge deck is arranged between the two cross beams, and a second base for supporting the cross beam is arranged along a second direction at one end of each cross beam away from the curved beam, and the first base comprises two pedestals arranged at intervals along the first direction, a main arch ring is arranged between the two pedestals, one end of the main arch ring is connected to one of the pedestals, and the other end is connected to the other pedestal; The arch ring components are symmetrically arranged at the two ends of the main arch ring along the first direction, and each of the arch ring components includes a main round arch and secondary round arches respectively arranged at the two ends of the main round arch along the first direction, the bottom end of the main round arch is fixedly connected to the base, one end of each secondary round arch is hinged to the main round arch, and one end of one of the secondary round arches away from the main round arch is connected to the curved beam member, and the other end of the secondary round arch away from the main round arch is connected to the main arch ring; Wherein, arch piers extending along the second direction are arranged on the arch tops of the main round arch, the secondary round arch and the main arch ring, and each of the arch piers is connected to the bridge deck.

2. The circular belly arch bridge according to claim 1, characterized in that: The arch bridge unit also includes a prestressed steel bundle, which is arranged between the two cross beams along a first direction and connected to the cross beams. The prestressed steel bundle is arranged below the bridge deck.

3. The circular belly arch bridge according to claim 1, characterized in that: A tensioning chamber for tensioning prestressed steel strands is provided inside each of the cross beams, two ends of the prestressed steel strands are respectively arranged in the tensioning chambers, and an inspection hole for operators to enter is provided below the tensioning chambers.

4. The circular belly arch bridge according to claim 1, characterized in that: A first expansion joint is arranged between the cross beam and the bridge deck.

5. The circular belly arch bridge according to claim 1, characterized in that: The first base also includes a first pile foundation arranged in a one-to-one correspondence with the cap, the cap is arranged above the first pile foundation, one end of the first pile foundation is connected to the foundation, and the other end is fixedly connected to the cap.

6. The circular belly 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 arranged above the second pile foundation, one end of the second pile foundation is connected to the foundation, and the other end is fixedly connected to the pier. The bridge abutment is arranged above the pier. The bridge abutment is arranged at one end of the cross beam member away from the bridge deck, and a second expansion joint is arranged between the bridge abutment and the cross beam member.

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

8. The circular belly arch bridge according to claim 1, characterized in that: A deflector for adjusting the direction of prestressed force is arranged in each of the arch piers, and the prestressed steel bundle passes through the deflector and is connected to the cross beam.

9. The circular belly arch bridge according to claim 1, characterized in that: There are multiple arch bridge units, and the multiple arch bridge units are arranged in sequence along the first direction.

10. A method for constructing an arch bridge, characterized in that: The following steps are involved: Step S1, constructing a first base and a second base in the bridge at the bridge location, and installing bearing members; Step S2, setting up temporary supports, casting curved beams, cross beams, main arch rings and arch buttresses of the main arch rings; Step S3, after the concrete strength of the curved beam, the cross beam and the main arch ring reaches 90% of the design strength, a temporary support is set up to cast the main round arch and the arch piers of the main round arch; Step S4, after the concrete strength of the main arch reaches 90% of the design strength, a temporary support is set up, the secondary arch and the arch pier of the secondary arch are cast, the prestressed steel strands are arranged, 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, tension the prestressed steel strands again, remove the temporary supports, and open the bridge to traffic.

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