A continuous steel box girder arch bridge construction method and continuous steel box girder arch bridge

Abstract

The application provides a continuous steel box girder arch bridge construction method and a continuous steel box girder arch bridge, and relates to the technical field of bridge engineering.The continuous steel box girder arch bridge construction method comprises the following steps: bridge pier installation: installing side piers and middle piers; beam falling: falling the steel box girder on temporary support points of the side piers and temporary support points of the middle piers; additional compressive stress application: bending the steel box girder to generate additional compressive stress by using the temporary support points of the side piers to lift and the temporary support points of the middle piers to fall the beam; and arch structure installation: installing an arch structure on the steel box girder.The continuous steel box girder arch bridge construction method makes the steel box girder displace by force through the side piers and the middle piers, generates additional compressive stress on the upper edge of the steel box girder, reduces the tensile stress generated on the upper edge of the steel box girder of the continuous girder bridge arch structure during later operation, and further reduces the tensile stress between the top plate of the middle pier and the steel box girder.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, and in particular to a construction method for a continuous steel box girder arch bridge and a continuous steel girder arch bridge. Background Technology

[0002] Currently, most beam-arch structures both domestically and internationally are simply supported tied arch structures. In continuous beam-arch bridges built in my country, the continuous beams are mostly variable-height prestressed concrete box girders, while the arch ribs are mostly steel-concrete composite structures. Compared to concrete continuous beam-arch bridges, continuous steel box girder arch bridges have the advantages of lower beam height, stronger spanning capacity, and convenient and rapid construction.

[0003] However, continuous beam structures generate bending moments under their own weight and vehicle loads during the stress process, resulting in tensile stress on the top slab of the bridge at the middle pier. The stress principle of arch bridge structures is to convert the vertical force on the bridge into horizontal thrust through the arch ribs, which will generate tensile stress on the top slab of the bridge, resulting in very large tensile stress on the top slab at the middle pier. Summary of the Invention

[0004] The purpose of this invention is to provide a construction method for a continuous steel box girder arch bridge and a continuous steel girder arch bridge, which can reduce the tensile stress generated on the upper edge of the steel box girder during the later operation of the continuous beam arch structure, thereby reducing the tensile stress between the top plate of the middle pier and the steel box girder.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] In a first aspect, the present invention provides a construction method for a continuous steel box girder arch bridge, comprising:

[0007] Bridge pier installation steps: construct the side piers and the middle pier;

[0008] Lowering the steel box girder: Lower the steel box girder to the temporary support points of the side piers and the temporary support points of the middle piers;

[0009] Steps for applying additional compressive stress: The steel box girder is bent to generate additional compressive stress by using the temporary support points of the side piers to lift the beam and the temporary support points of the middle piers to lower the beam.

[0010] Arch structure installation steps: Install the arch structure on the steel box girder.

[0011] Furthermore, the side pier includes a first pier body, a first pad stone, a first support, and a first lifting mechanism. The first pad stone and the first lifting mechanism are both installed on the first pier body. The first support is installed on the side of the first pad stone away from the first pier body. The top of the first lifting mechanism is a temporary support point for the side pier.

[0012] Furthermore, the central pier includes a second pier body, a second pad stone, a second support, and a second lifting mechanism. The second pad stone and the second lifting mechanism are both installed on the second pier body. The end of the second lifting mechanism away from the second pier body is connected to the steel box girder. The second support is installed on the side of the second pad stone away from the second pier body. The top of the second lifting mechanism is a temporary support point for the central pier.

[0013] Furthermore, in the beam lowering step:

[0014] The first support is not installed on the first pad stone, and the height of the first lifting mechanism is less than the sum of the heights of the first pad stone and the first support.

[0015] The second support is installed on the second pad stone, and the height of the second lifting mechanism is greater than the sum of the heights of the first pad stone and the first support.

[0016] Furthermore, the step of applying additional compressive stress specifically includes:

[0017] The steel box girder is lifted by the first lifting mechanism, the first support is installed on the first pad stone, and then the first lifting mechanism is lowered to place the steel box girder on the first support.

[0018] The second lifting mechanism moves down to place the steel box girder onto the second support.

[0019] Furthermore, the beam lowering step specifically includes:

[0020] The prefabricated steel box girder segments are transported to the bridge site, where they are installed and spliced ​​on-site, and then placed on the temporary support points of the side piers and the central pier.

[0021] Furthermore, the arch structure installation steps specifically include:

[0022] Arch feet are installed on the steel box girder, multiple arch ribs are installed between the arch feet, cross braces are installed between each arch rib, and hangers are installed between each arch rib and the steel box girder. Initial tension is applied to the hangers in a specified sequence, and the cable force of the hangers is adjusted.

[0023] Furthermore, during the process of installing the arch feet on the steel box girder, installing multiple arch ribs between the arch feet, and installing cross braces between each of the arch ribs:

[0024] The arch ribs, arch feet, and cross braces are hoisted section by section onto the support frame erected on the steel box girder for installation, and then the arch ribs, arch feet, and cross braces are welded into a whole.

[0025] Secondly, the present invention also provides a continuous steel box girder arch bridge, including side piers, a middle pier, and a steel box girder. The side piers are supported at both ends of the steel box girder, and the middle piers are supported between the two ends of the steel box girder. The steel box girder bends downward in the middle and curves upward at both ends under the constraint of the side piers and the middle piers.

[0026] Furthermore, the side pier includes a first pier body, a first pad stone, a first support, and a first lifting mechanism. The first pad stone and the first lifting mechanism are both installed on the first pier body, and the first support is installed on the side of the first pad stone away from the first pier body.

[0027] The central pier includes a second pier body, a second pad stone, a second support, and a second lifting mechanism. The second pad stone and the second lifting mechanism are both installed on the second pier body, and the second support is installed on the side of the second pad stone away from the second pier body.

[0028] The construction method for continuous steel box girder arch bridges and the continuous steel girder arch bridges provided by this invention have the following beneficial effects:

[0029] Compared with the prior art, the construction method of continuous steel box girder arch bridge provided by the first aspect of the present invention first temporarily supports the steel box girder through temporary support points of the side piers and the middle pier. Then, the steel box girder is forced to move by lifting the temporary support points of the side piers and lowering the temporary support points of the middle pier, forming a structure with both ends raised and the middle bent downward. This generates additional compressive stress on the upper edge of the steel box girder, reduces the tensile stress generated by the arch ribs on the upper edge of the steel box girder during the later operation of the arch structure, and thus reduces the tensile stress generated by the top plate of the middle pier on the steel box girder.

[0030] Compared with the prior art, the continuous steel box girder arch bridge provided by the second aspect of the present invention can form a structural form with a downward curve in the middle and an upward curve at both ends under the constraint of the side piers and the middle pier. This can reduce the tensile stress generated by the arch ribs on the upper edge of the steel box girder during the later operation of the arch structure, thereby reducing the tensile stress generated by the top plate of the middle pier on the steel box girder. Attached Figure Description

[0031] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0032] Figure 1 This is a structural schematic diagram of the pier installation steps in a construction method for a continuous steel box girder arch bridge provided by an embodiment of the present invention;

[0033] Figure 2This is a structural schematic diagram of the beam lowering step in a construction method for a continuous steel box girder arch bridge provided by an embodiment of the present invention;

[0034] Figure 3 This is a structural schematic diagram of the step of applying additional compressive stress in a construction method for a continuous steel box girder arch bridge provided by an embodiment of the present invention;

[0035] Figure 4 An elevation view of a continuous steel box girder arch bridge provided in an embodiment of the present invention;

[0036] Figure 5 This is a structural diagram of a continuous steel box girder arch bridge construction method provided by an embodiment of the present invention, showing the steel box girder resting on a temporary support point on the side pier.

[0037] Figure 6 This is a schematic diagram of the structure of a continuous steel box girder arch bridge construction method provided by an embodiment of the present invention when the steel box girder is placed on the first support;

[0038] Figure 7 This is a structural diagram of a continuous steel box girder arch bridge construction method provided by an embodiment of the present invention, showing the steel box girder resting on the temporary support point of the central pier.

[0039] Figure 8 This is a schematic diagram of the structure of a continuous steel box girder arch bridge construction method provided by an embodiment of the present invention when the steel box girder is placed on the second support;

[0040] Figure 9 A plan view of a continuous steel box girder arch bridge provided in an embodiment of the present invention;

[0041] Figure 10 This is a schematic cross-sectional view of a continuous steel box girder arch bridge at the support point, provided in an embodiment of the present invention.

[0042] Figure 11 This is a schematic diagram of the arch foot structure of a continuous steel box girder arch bridge provided in an embodiment of the present invention.

[0043] Icons: 1 - Side pier; 11 - First pier body; 12 - First pad stone; 13 - First support; 14 - First lifting mechanism; 2 - Middle pier; 21 - Second pier body; 22 - Second pad stone; 23 - Second support; 24 - Second lifting mechanism; 3 - Steel box girder; 31 - Steel box girder diaphragm; 32 - Steel box girder bottom leveling steel plate; 4 - Arch structure; 41 - Arch foot; 42 - Arch rib; 43 - Horizontal brace; 44 - Hanger. Detailed Implementation

[0044] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0045] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0048] A first aspect of the present invention provides a construction method for a continuous steel box girder arch bridge, comprising:

[0049] Pier installation steps: construct side pier 1 and middle pier 2;

[0050] Lowering procedure: Lower the steel box girder 3 onto the temporary support points of the side pier 1 and the middle pier 2;

[0051] Steps for applying additional compressive stress: The steel box girder 3 is bent to generate additional compressive stress by using the temporary support points of side pier 1 to lift the beam and the temporary support points of middle pier 2 to lower the beam.

[0052] Installation steps for arch structure 4: Install arch structure 4 on steel box girder 3.

[0053] Combination Figures 1 to 6 The construction method for the above-mentioned continuous steel box girder arch bridge is explained as follows: First, as Figure 1As shown, construction begins with side pier 1 and middle pier 2. At this point, the tops of side pier 1 and middle pier 2 serve as temporary support points for the steel box girder 3; subsequently, as... Figure 2 As shown, the steel box girder 3 is placed on the temporary support points of the side pier 1 and the middle pier 2, without the side piers and the middle pier applying any additional force to the steel box girder 3; then as... Figure 3 As shown, the steel box girder 3 is subjected to additional compressive stress by using temporary support points at side pier 1 to lift it and temporary support points at middle pier 2 to lower it; finally, as shown... Figure 4 As shown, an arch structure 4 is installed on the steel box girder 3.

[0054] In actual use, continuous steel box girder arch bridges experience downward bending moments at mid-span and upward bending moments at the central support under loads such as self-weight and vehicle loads. This results in tensile stress on the top plate of the steel box girder 3 at the central pier. The arch structure 4, through the tension of its suspenders 44, converts the vertical forces on the bridge into horizontal thrust via the arch ribs 42 and arch feet 41, further contributing to the tensile stress on the top plate of the steel box girder 3. Additionally, under the support and restraint of the side piers 1 and the central pier 2, the steel box girder 3 between the side pier 1 and the adjacent central pier 2, and between adjacent central piers 2, exhibits significant downward bending deformation. The steel box girder 3 at the support of the central pier 2 tends to deform upwards, resulting in substantial tensile stress on the top plate of the steel box girder 3 at the central pier 2.

[0055] In this regard, in the above embodiment, the steel box girder is forced to move by using the temporary support points of the side piers to lift it and the temporary support points of the middle piers to lower it, forming a structure with both ends raised and the middle bent downward. This generates additional compressive stress on the upper edge of the steel box girder. The additional compressive stress can resist the tensile stress generated by the top plate of the continuous steel box girder arch bridge during operation, thereby reducing the tensile stress between the top plate of the middle pier and the steel box girder.

[0056] In alternative implementations, such as Figure 5 and Figure 6 As shown, to facilitate the lifting of the steel box girder 3 by the side pier 1, the side pier 1 includes a first pier body 11, a first pad stone 12, a first support 13, and a first lifting mechanism 14. The first pad stone 12 and the first lifting mechanism 14 are both installed on the first pier body 11. The first support 13 is used to install on the side of the first pad stone 12 away from the first pier body 11. The top of the first lifting mechanism 14 is a temporary support point for the side pier 1. That is to say, in the beam lowering step, the steel box girder 3 is lowered onto the first lifting mechanism 14.

[0057] Specifically, such as Figure 5 As shown, both the first pad stone 12 and the first lifting mechanism 14 can be configured in multiple ways, and the first pad stone 12 can be set around the first lifting mechanism 14.

[0058] The first lifting mechanism 14 can be a jack.

[0059] In alternative implementations, such as Figure 7 As shown, to facilitate the lowering of the steel box girder 3 by the middle pier 2, the middle pier 2 includes a second pier body 21, a second pad stone 22, a second support 23, and a second lifting mechanism 24. The second pad stone 22 and the second lifting mechanism 24 are both installed on the second pier body 21. The end of the second lifting mechanism 24 facing away from the second pier body 21 is used to connect with the steel box girder 3. The second support 23 is installed on the side of the second pad stone 22 facing away from the second pier body 21. The top of the second lifting mechanism 24 is a temporary support point for the middle pier 2. That is to say, in the beam lowering step, the steel box girder 3 is lowered onto the second lifting mechanism 24.

[0060] Specifically, such as Figure 7 As shown, multiple second pad stones 22 and multiple second lifting mechanisms 24 can be configured, and the second pad stone 22 can be set on the periphery of the second lifting mechanism 24.

[0061] The second lifting mechanism 24 can be a jack.

[0062] In an optional implementation, during the beam lowering step: as follows Figure 5 As shown, the first support 13 is not installed on the first pad stone 12, and the height of the first lifting mechanism 14 is less than the sum of the heights of the first pad stone 12 and the first support 13. At this time, the distance between the steel box beam 3 and the first pad stone 12 is less than the first support 13, and the first support 13 cannot be installed on the first pad stone 12.

[0063] It is understandable that, since the steel box girder 3 is placed on the first lifting mechanism 14 during the beam lowering step, the height of the first lifting mechanism 14 is greater than the height of the first pad stone 12 during the above process.

[0064] In an optional implementation, during the beam lowering step: as follows Figure 7 As shown, a second support 23 is installed on the second pad stone 22, and the height of the second lifting mechanism 24 is greater than the sum of the heights of the first pad stone 12 and the first support 13, so that the middle pier 2 supports the steel box girder 3 only through the second lifting mechanism 24.

[0065] In an optional implementation, the step of applying additional compressive stress specifically includes:

[0066] The first lifting mechanism 14 is used to lift the steel box girder 3 upwards, so that the distance between the steel box girder 3 and the first pad stone 12 is greater than that between the first support 13 and the first support 13 is installed on the first pad stone 12. Then... Figure 6 As shown, the first lifting mechanism 14 moves down to place the steel box girder 3 onto the first support 13;

[0067] like Figure 8 As shown, the second lifting mechanism 24 moves down, causing the steel box girder 3 to fall onto the second support 23.

[0068] The above process is simple to operate and can make the steel box girder 3 form a structure with both ends curving upward and the middle bending downward. This will generate additional compressive stress on the upper edge of the steel box girder, reduce the tensile stress generated by the arch rib 42 on the upper edge of the steel box girder 3 during the later operation of the arch structure 4, and thus reduce the tensile stress generated by the top plate of the middle pier on the steel box girder 3. It has the characteristics of clear stress distribution and no need to use other steel materials.

[0069] In practice, the required heights for lifting and lowering the beams at side pier 1 and middle pier 2 can be determined based on the stress requirements of the continuous steel box girder arch bridge.

[0070] In an optional implementation, the beam lowering step specifically includes: transporting the prefabricated steel box girder segments to the bridge site, installing and splicing the steel box girder 3 on site, and lowering the steel box girder 3 onto the temporary support points of the side pier 1 and the middle pier 2.

[0071] Among them, the prefabricated steel box girder segments are transported to the bridge site and can be hoisted and welded in batches using the construction method of erecting supports, or other construction methods such as jacking, cantilever assembly or rotation can be used to place the steel box girder 3 onto the jacks of the bridge piers.

[0072] In an optional implementation, the installation steps of the arch structure 4 specifically include: as follows Figure 9 and Figure 10 As shown, arch feet 41 are installed on the steel box girder 3, multiple arch ribs 42 are installed between the arch feet, cross braces 43 are installed between each arch rib 42, and hangers 44 are installed between each arch rib 42 and the steel box girder 3. Initial tension is applied to the hangers 44 in a specified sequence, and the cable force of the hangers 44 is adjusted, thereby realizing the installation of the arch structure 4.

[0073] In an optional implementation, to facilitate the operation of construction personnel, arch feet 41 are installed on the steel box girder 3, multiple arch ribs 42 are installed between the arch feet, and cross braces 43 are installed between the arch ribs 42:

[0074] The arch ribs 42, arch feet and cross braces 43 can be hoisted section by section onto the support frame erected on the steel box girder 3 for installation, and the arch ribs 42, arch feet and cross braces 43 can be welded into a whole.

[0075] like Figure 11 The steel box girder 3 has a steel box girder partition 31 and a steel box girder bottom leveling steel plate 32.

[0076] In an optional implementation, after the step of applying additional compressive stress, a bridge deck system construction step may also be included, specifically including: after the main structure is completed, the bridge deck system is constructed, the suspender force is adjusted to reach the design cable force, and the bridge is opened to traffic.

[0077] The second aspect of the present invention provides a continuous steel box girder arch bridge. The continuous steel box girder arch bridge provided by the second aspect of the present invention includes side piers 1, middle piers 2 and steel box girders 3. The side piers 1 are supported at both ends of the steel box girder 3, and the middle piers 2 are supported between the two ends of the steel box girder 3. The steel box girder 3 is bent downward in the middle and curved upward at both ends under the constraint of the side piers 1 and the middle piers 2.

[0078] Compared with the prior art, the continuous steel box girder arch bridge provided by the second aspect embodiment of the present invention can form a structural form with a downward curve in the middle and an upward curve at both ends under the limitation of the side pier 1 and the middle pier 2. This can reduce the tensile stress generated by the arch rib 42 on the upper edge of the steel box girder during the later operation of the arch structure 4, thereby reducing the tensile stress generated by the top plate of the middle pier on the steel box girder.

[0079] In alternative implementations, such as Figure 5 and Figure 6 As shown, the side pier 1 includes a first pier body 11, a first pad stone 12, a first support 13, and a first lifting mechanism 14. The first pad stone 12 and the first lifting mechanism 14 are both installed on the first pier body 11, and the first support 13 is installed on the side of the first pad stone 12 away from the first pier body 11. The middle pier 2 includes a second pier body 21, a second pad stone 22, a second support 23, and a second lifting mechanism 24. The second pad stone 22 and the second lifting mechanism 24 are both installed on the second pier body 21, and the second support 23 is installed on the side of the second pad stone 22 away from the second pier body 21.

[0080] During the lowering of the steel box girder, the first support 13 is not installed on the first pad stone 12, and the height of the first lifting mechanism 14 is less than the sum of the heights of the first pad stone 12 and the first support 13. At this time, the distance between the steel box girder 3 and the first pad stone 12 is less than the first support 13, and the first support 13 cannot be installed on the first pad stone 12. The steel box girder 3 falls onto the first lifting mechanism 14. The second support 23 is installed on the second pad stone 22, and the height of the second lifting mechanism 24 is greater than the sum of the heights of the first pad stone 12 and the first support 13. The middle pier 2 is supported by the steel box girder 3 only through the second lifting mechanism 24.

[0081] Subsequently, the first lifting mechanism 14 is used to lift the steel box girder 3 upwards, so that the distance between the steel box girder 3 and the first pad stone 12 is greater than the first support 13. The first support 13 is then installed on the first pad stone 12, and then... Figure 6 As shown, the first lifting mechanism 14 moves down to lower the steel box girder 3 onto the first support 13; as Figure 8 As shown, the second lifting mechanism 24 moves down, causing the steel box girder 3 to fall onto the second support 23.

[0082] Through the above process, the steel box girder 3 can be made to form a structure with both ends curving upward and the middle bending downward, so that additional compressive stress is generated on the upper edge of the steel box girder, reducing the tensile stress generated by the arch rib 42 on the upper edge of the steel box girder 3 during the later operation of the arch structure 4, thereby reducing the tensile stress generated by the top plate of the middle pier on the steel box girder 3. It has the characteristics of clear stress and no need to use other steel materials.

[0083] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A construction method for a continuous steel box girder arch bridge, characterized in that, include: Bridge pier installation steps: construct the side piers (1) and the middle piers (2); Lowering the beam: Lower the steel box girder (3) to the temporary support points of the side pier (1) and the temporary support points of the middle pier (2); Steps for applying additional compressive stress: The steel box girder (3) is bent to generate additional compressive stress by using the temporary support points of the side pier (1) to lift and the temporary support points of the middle pier (2) to lower the beam; Arch structure (4) installation steps: Install arch structure (4) on the steel box girder (3); The side pier (1) includes a first pier body (11), a first pad stone (12), a first support (13) and a first lifting mechanism (14). The first pad stone (12) and the first lifting mechanism (14) are both installed on the first pier body (11). The first support (13) is installed on the side of the first pad stone (12) away from the first pier body (11). The top of the first lifting mechanism (14) is a temporary support point for the side pier (1). The middle pier (2) includes a second pier body (21), a second pad stone (22), a second support (23), and a second lifting mechanism (24). The second pad stone (22) and the second lifting mechanism (24) are both installed on the second pier body (21). The end of the second lifting mechanism (24) away from the second pier body (21) is connected to the steel box girder (3). The second support (23) is installed on the side of the second pad stone (22) away from the second pier body (21). The top of the second lifting mechanism (24) is a temporary support point for the middle pier (2). In the beam lowering step: The first support (13) is not installed on the first pad stone (12), and the height of the first lifting mechanism (14) is less than the sum of the heights of the first pad stone (12) and the first support (13); The second support (23) is installed on the second pad stone (22), and the height of the second lifting mechanism (24) is greater than the sum of the heights of the first pad stone (12) and the first support (13); The step of applying additional compressive stress specifically includes: The steel box girder (3) is lifted by the first lifting mechanism (14), the first support (13) is installed on the first pad stone (12), and then the first lifting mechanism (14) moves down to place the steel box girder (3) on the first support (13); The second lifting mechanism (24) moves down to place the steel box girder (3) onto the second support (23).

2. The construction method for a continuous steel box girder arch bridge according to claim 1, characterized in that, The beam lowering step specifically includes: The prefabricated steel box girder segments are transported to the bridge site, and the steel box girder (3) is installed and spliced ​​on site. The steel box girder (3) is then placed on the temporary support points of the side pier (1) and the middle pier (2).

3. The construction method for a continuous steel box girder arch bridge according to claim 1, characterized in that, The installation steps of the arch structure (4) specifically include: An arch foot (41) is installed on the steel box girder (3), a plurality of arch ribs (42) are installed between the arch feet (41), a cross brace (43) is installed between each of the arch ribs (42), a hanger (44) is installed between each of the arch ribs (42) and the steel box girder (3), an initial tension is applied to the hanger (44) in a specified order, and the cable force of the hanger (44) is adjusted.

4. The construction method for a continuous steel box girder arch bridge according to claim 3, characterized in that, During the process of installing arch feet (41) on the steel box girder (3), installing multiple arch ribs (42) between the arch feet (41), and installing cross braces (43) between each of the arch ribs (42): The arch rib (42), the arch foot (41) and the cross brace (43) are hoisted section by section onto the support erected on the steel box girder (3) for installation, and the arch rib (42), the arch foot (41) and the cross brace (43) are welded into a whole.

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