Method for rotating construction of a bridge and bridge

Abstract

The application belongs to the technical field of bridge erection, and discloses a cross bridge rotating construction method and a bridge. The cross bridge rotating construction method comprises the following steps: installing a rotating seat body; installing a first cross beam; the first cross beam is installed on a first pier and the rotating seat body; erecting a cable tower; connecting a first cable; rotating the rotating seat body by 180 degrees to install a second cross beam, connecting a second cable; installing a first counterweight on the first cross beam between the second pier and a third pier, so that the whole cross beam is balanced with the first counterweight; rotating the rotating seat body by 180 degrees, so that the whole cross beam is synchronously rotated by 180 degrees together with the cable tower, the first counterweight, the first cable and the second cable, and the whole cross beam is supported by the first pier, the rotating seat body, the third pier and a plurality of piers on the side of the third piers away from the second pier; S10, removing the cable tower, the first cable, the second cable and the first counterweight, replacing the rotating seat body with a first support, and fixing the whole cross beam on each pier.

Description

Technical Field

[0001] This invention relates to the field of bridge construction technology, and in particular to a method for rotating construction of a span bridge and the bridge itself. Background Technology

[0002] As urban rail transit lines become increasingly dense, newly constructed municipal elevated bridges inevitably cross existing rail transit lines. These bridges often employ large-span steel box girder structures, and construction must be carried out without disrupting the operation of the rail transit lines. Currently, relatively mature installation methods for large-span bridges include segmented hoisting, integral hoisting, and segmented hoisting with longitudinal jacking and sliding.

[0003] Segmented hoisting involves dividing a single-span steel box girder into several hoisting units according to certain segmentation principles. Temporary support structures are set up within the span, and a reasonable hoisting sequence is determined to gradually complete the installation of the entire span of the steel box girder. This construction method requires sufficient space within the span to set up temporary support structures, sufficient space within the span to stop the hoisting equipment, and sufficient load-bearing capacity within the span.

[0004] The integral hoisting method involves assembling a single-span steel box girder into a whole on a nearby site and then hoisting it into place using appropriate lifting equipment. This construction method is limited by the lifting capacity of the lifting equipment, as well as the bearing capacity of the foundation at the location where the lifting equipment stops. Furthermore, a suitable assembly site must be available around the viaduct.

[0005] Longitudinal jacking involves hoisting and assembling steel box girders in sections above a jig at adjacent spans. Guide beams are then installed on the adjacent span's site, and jacking equipment of appropriate capacity is used to push the steel box girders to the installation position. This method requires numerous jigs for pre-assembly, consumes a large amount of steel for the guide beams, and requires mechanical assistance for disassembly and assembly, necessitating suitable parking areas for such machinery. Furthermore, jacking construction places high demands on the geometric shape of the beam structure, limiting its applicability. Summary of the Invention

[0006] The purpose of this invention is to provide a method for rotating construction of a span bridge and the bridge itself, which has no impact on the internal structures, is not limited by the construction site and the capacity of lifting equipment, reduces construction risks, saves steel for construction, and has a wide range of applications.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A method for rotating the construction of a span bridge, wherein multiple piers are erected at intervals along the direction of the span bridge, each pier including a first pier, a second pier, and a third pier that are sequentially adjacent, and there is an existing structure between the second pier and the third pier. The construction method includes the following steps:

[0009] S1. Install the rotating base: The rotating base is installed on the second pier;

[0010] S2. Install the first span beam: The first span beam is installed on the first pier and the rotating base;

[0011] S3. Erecting a cable tower: Erecting a cable tower on the first span beam, with the cable tower located directly above the rotating base;

[0012] S4. Connecting the first stay cable: One end of the first stay cable is connected to the tower, and the other end is connected to the end of the first span beam away from the second pier;

[0013] S5. The rotating seat rotates 180°, causing the first span beam, together with the tower and the first cable-stayed cable, to rotate 180° synchronously. The end of the first span beam connected to the first cable-stayed cable is located between the second pier and the third pier.

[0014] S6. Install the second span beam: The second span beam is installed on the first pier and several piers on the side of the first pier away from the second pier. One end of the second span beam is fixedly connected to the end of the first span beam away from the first cable to form a whole span beam. The length of the second span beam is greater than the distance between the second pier and the third pier.

[0015] S7. Connecting the second stay cable: One end of the second stay cable is connected to the tower, and the other end is connected to the end of the second span beam away from the first span beam;

[0016] S8. Install a first counterweight on the first span beam between the second pier and the third pier to balance the entire span beam with the first counterweight.

[0017] S9. The rotating seat rotates 180°, causing the entire span beam, together with the tower, the first counterweight, the first stay cable, and the second stay cable, to rotate 180° synchronously. The entire span beam is supported by the first pier, the rotating seat, the third pier, and several piers on the side of the third pier away from the second pier.

[0018] S10. Remove the cable tower, the first stay cable, the second stay cable and the first counterweight, replace the rotating seat with the first support, and fix the whole span beam on each of the bridge piers.

[0019] Optionally, the first span beam includes multiple first segment beams, and step S2 further includes: installing and splicing each of the first segment beams using a segmented hoisting process to form the first span beam.

[0020] Optionally, the second span beam includes multiple second segment beams, and step S6 further includes: installing and splicing each of the second segment beams using a segmented hoisting process to form the second span beam.

[0021] Optionally,

[0022] Between steps S6 and S8, the second span beam is temporarily fixed to each of the piers supporting it.

[0023] Between step S8 and step S9, the second span beam is released from its fixed connection with each of the supporting piers.

[0024] Optionally, step S2 includes: installing a first temporary support on the first pier, and installing the first span beam on the first temporary support;

[0025] Step S6 includes: pre-installing second temporary supports on each of the piers where the second span beam is installed, and the second span beam is installed on the first temporary support and each of the second temporary supports;

[0026] Step S10 includes replacing the first temporary support and each of the second temporary supports with a second support, and fixing the entire span beam to the first support and each of the second supports.

[0027] Optionally, replacing the rotating seat with a first support in step S10 includes: using jacks to lift the entire span beam, removing the rotating seat, installing the first support on the second pier, and using jacks to lower the entire span beam onto the first support.

[0028] Optionally,

[0029] Step S4 further includes: fixing a first lifting lug at the end of the first span beam away from the second pier, and connecting the first stay cable to the first lifting lug; and / or,

[0030] Step S7 further includes: fixing a second lug on the end of the second span away from the first span, and connecting the second stay cable to the second lug.

[0031] Optionally, between step S4 and step S5, step S11 is further included: installing a second counterweight on the first span beam between the second pier and the third pier to balance the first span beam with the second counterweight.

[0032] Optionally, in step S2: the first span beam is temporarily fixed to each of the piers supporting it;

[0033] Between step S11 and step S5, the method further includes: releasing the first span beam from the fixed connection between it and each of the supporting piers.

[0034] The bridge was constructed using the aforementioned rotating construction method for span bridges.

[0035] Beneficial effects:

[0036] In the bridge rotation construction method for span bridges provided by this invention, the first span is constructed first on the side of the existing structure. After the first span is rotated using a rotating base, the second span is constructed at the location where the first span was constructed. This facilitates the construction of a cable structure consisting of the entire span beam, the first stay cable, the second stay cable, the pylon, and the first counterweight. During the construction of the cable structure, the installation of the first and second span beams on the piers is located on the side of the existing structure, and the construction process is not affected by the site within the span where the existing structure is located, nor does it affect the existing structure. Moreover, the construction processes of the first stay cable, the second stay cable, and the pylon are also located on the side of the existing structure, avoiding any impact on the existing structure. Compared with existing construction techniques, the bridge rotation construction method for span bridges provided by this invention has no impact on the structure within the span, is not limited by the construction site or the capacity of lifting equipment, reduces construction risks, saves steel, and has a wide range of applications. Attached Figure Description

[0037] Figure 1 This is an engineering schematic diagram of step S4 being completed in an embodiment of the present invention;

[0038] Figure 2 yes Figure 1 A top view of the construction process;

[0039] Figure 3 This is an engineering schematic diagram of step S5 in an embodiment of the present invention;

[0040] Figure 4 yes Figure 3 A top view of the construction process;

[0041] Figure 5 This is an engineering schematic diagram of step S7 being completed in an embodiment of the present invention;

[0042] Figure 6 This is an engineering schematic diagram of step S8 in an embodiment of the present invention;

[0043] Figure 7 This is an engineering schematic diagram of step S9 being completed in an embodiment of the present invention;

[0044] Figure 8 This is an engineering schematic diagram of replacing the rotating base with a jack in an embodiment of the present invention;

[0045] Figure 9This is an engineering schematic diagram of completing step S10 in an embodiment of the present invention;

[0046] Figure 10 This is an engineering schematic diagram of the entire span beam being fixed in an embodiment of the present invention.

[0047] In the picture:

[0048] 100. Bridge pier; 101. First bridge pier; 102. Second bridge pier; 103. Third bridge pier; 104. First support; 105. Second support; 106. First temporary support; 107. Second temporary support; 108. Jack; 200. Existing building;

[0049] 1. Full span beam; 11. First span beam; 12. Second span beam;

[0050] 2. Rotating base; 3. Tower; 31. Third lifting lug; 32. Fourth lifting lug; 4. First stay cable; 5. Second stay cable; 6. First counterweight; 7. First lifting lug; 8. Second lifting lug. Detailed Implementation

[0051] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0052] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0053] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0054] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, 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 present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0055] This embodiment provides a method for rotating construction of a span bridge, such as... Figure 1 As shown, multiple piers 100 are erected at intervals along the course of the span bridge. Each pier 100 includes a first pier 101, a second pier 102, and a third pier 103 that are sequentially adjacent to each other. There is an existing structure 200 between the second pier 102 and the third pier 103. In addition to the existing structure 200, there may also be a river, valley, etc. between the second pier 102 and the third pier 103.

[0056] like Figures 1-10 As shown, specifically, the construction method for rotating a span bridge includes the following steps:

[0057] S1. Install rotating seat 2: Rotating seat 2 is installed on the second pier 102;

[0058] S2. Install the first span beam 11: The first span beam 11 is installed on the first pier 101 and the rotating base 2. Optionally, the first span beam 11 includes multiple first segment beams. Step S2 further includes: installing and splicing each first segment beam using a segmented hoisting process to form the first span beam 11. Using a segmented hoisting process to construct the first span beam 11 avoids the impact of the construction site and the lifting equipment capacity, and because the construction is carried out to the side of the existing building 200, it will not affect the existing building 200. In this embodiment, the length of the first span beam 11 is approximately equal to the distance between the first pier 101 and the second pier 102.

[0059] S3, Erecting Tower 3: Tower 3 is erected on the first span beam 11, and Tower 3 is located directly above the rotating base 2;

[0060] S4. Connecting the first cable-stayed cable 4: One end of the first cable-stayed cable 4 is connected to the tower 3, and the other end is connected to the end of the first span beam 11 away from the second pier 102;

[0061] S5. Rotate the rotating seat 2 by 180°, so that the first span beam 11, together with the tower 3 and the first cable 4, rotate 180° synchronously. The end of the first span beam 11 connected to the first cable 4 is located between the second pier 102 and the third pier 103.

[0062] S6. Install the second span beam 12: The second span beam 12 is installed on the first pier 101 and several piers 100 on the side of the first pier 101 away from the second pier 102. One end of the second span beam 12 is fixedly connected to the end of the first span beam 11 away from the first cable 4 to form a whole span beam 1. The length of the second span beam 12 is greater than the distance between the second pier 102 and the third pier 103. Optionally, the second span beam 12 includes multiple second segment beams. Step S6 further includes: installing and splicing each second segment beam using a segmented hoisting process to form the second span beam 12. Constructing the second span beam 12 using a segmented hoisting process avoids the impact of the construction site and the capacity of the hoisting equipment, thereby facilitating the construction of a second span beam 12 that is sufficient to span the second pier 102 and the third pier 103. Moreover, since the construction is carried out on the side of the existing building 200, it will not affect the existing building 200.

[0063] S7. Connecting the second stay cable 5: One end of the second stay cable 5 is connected to the tower 3, and the other end is connected to the end of the second span beam 12 away from the first span beam 11;

[0064] S8. Install the first counterweight 6 on the first span beam 11 between the second pier 102 and the third pier 103 to balance the entire span beam 1 with the first counterweight 6.

[0065] S9. Rotating seat 2 rotates 180°, causing the entire span beam 1, together with tower 3, first counterweight 6, first stay cable 4 and second stay cable 5, to rotate 180° synchronously. The entire span beam 1 is supported by the first pier 101, rotating seat 2, third pier 103 and several piers 100 on the side of the third pier 103 away from the second pier 102.

[0066] S10. Dismantle the pylon 3, the first stay cable 4, the second stay cable 5, and the first counterweight 6, and replace the rotating seat 2 with the first support 104 to fix the entire span beam 1 on each pier 100. Specifically, replacing the rotating seat 2 with the first support 104 in step S10 includes: using jacks 108 to lift the entire span beam 1, dismantling the rotating seat 2, installing the first support 104 on the second pier 102, and using jacks 108 to lower the entire span beam 1 onto the first support 104.

[0067] In step S2, the first span beam 11 is installed on the pier 100 on the side of the existing building 200. Therefore, the construction process of installing the first span beam 11 is not affected by the existing building 200 and will not have any impact on the existing building 200. In steps S3-S5, by setting up the cable tower 3 and the first cable stay 4 on the first span beam 11, the first span beam 11 can be effectively supported during the rotation process. This allows the portion of the first span beam 11, except for the part set on the rotating seat 2, to be suspended in the air during rotation and after stopping, thus making room for the construction of the second span beam 12 and facilitating the construction of the cable structure. In step S6, the second span beam 12 is similar to the first span beam 11, and is also constructed and installed on the pier 100 on the side of the existing building 200. The construction process of the second span beam 12 is not affected by the existing building 200 and will not have any impact on the existing building 200. In steps S7-S8, the second span beam 12, the first span beam 11, the second stay cable 5, the first stay cable 4, the tower 3, and the first counterweight 6 form a cable structure that maintains balance. This facilitates the overall rotation of the second span beam 12 in a suspended manner above the existing building 200, directly supporting it on the second piers 102 and the third pier 103 on both sides of the existing building 200. In step S10, the rotating base 2 is removed and replaced by the first support 104. The entire span beam 1 is then fixed to each pier 100. After removing the tower 3, the first stay cable 4, the second stay cable 5, and the first counterweight 6, the construction of the entire span beam 1 is completed. The rotating base 2, the first stay cable 4, the second stay cable 5, the first counterweight 6, and the tower 3 can all be recycled for other projects, thus saving construction materials.

[0068] In the bridge rotation construction method provided in this embodiment, the first span beam 11 is first constructed to the side of the existing structure 200. After rotating the first span beam 11 using the rotating base 2, the second span beam 12 is constructed at the location where the first span beam 11 was constructed. This facilitates the construction of a cable structure with the entire span beam 1, the first stay cable 4, the second stay cable 5, the tower 3, and the first counterweight 6 as components. During the construction of the cable structure, the installation of the first span beam 11 and the second span beam 12 on the pier 100 is located to the side of the existing structure 200. The construction process is not affected by the site within the span where the existing structure 200 is located, nor does it affect the existing structure 200. Moreover, the construction processes of the first stay cable 4, the second stay cable 5, and the tower 3 are also located to the side of the existing structure 200, avoiding any impact on the existing structure 200. Compared with existing construction processes, the bridge rotation construction method provided by this invention has no impact on the structure within the span, is not limited by the construction site and the capacity of lifting equipment, reduces construction risks, saves steel for construction, and has a wide range of applications.

[0069] In this embodiment, using the first span beam 11 as the support arm of the first counterweight 6 can significantly extend the length of the second span beam 12 connected to the first span beam 11, thereby giving the second span beam 12 the length to span over the second pier 102 and the third pier 103. When the first span beam 11 is rotated alone, the length of the first span beam 11 cannot meet the requirement of spanning the large span of the second pier 102 and the third pier 103.

[0070] Step S2 includes: installing a first temporary support 106 on the first pier 101, and installing the first span beam 11 on the first temporary support 106; Step S6 includes: pre-installing second temporary supports 107 on each pier 100 where the second span beam 12 is installed, and installing the second span beam 12 on the first temporary support 106 and each of the second temporary supports 107; Step S10 includes: replacing the first temporary support 106 and each of the second temporary supports 107 with a second support 105, and fixing the entire span beam 1 on the first support 104 and each of the second supports 105. The first temporary support 106 and the second temporary support 107 serve as support components during construction, jointly supporting each part of the entire span beam 1 together with the rotating base 2. After the entire span beam 1 is rotated, the second supports 105 used to support the entire span beam 1 are then installed on each pier 100. The first temporary support 106 and the second temporary support 107 both serve as temporary supports, facilitating adjustments to accommodate the construction process, while the first support 104 and the second support 105 are mainly used to fix the entire span beam 1. In this embodiment, the first support 104 and the second support 105 are both steel supports in the prior art, and their specific structures will not be described in detail here.

[0071] Optionally, between steps S6 and S8, the second span beam 12 is temporarily fixed to each of the supporting piers 100; between steps S8 and S9, the fixed connection between the second span beam 12 and each supporting pier 100 is released. Fixing the second span beam 12 maintains the stability of the entire span beam 1 on the piers 100, allowing for the safe installation of the first counterweight 6. After the first counterweight 6 is installed and the entire span beam 1 is balanced, the connection between each pier 100 and the second span beam 12 is released one by one. In this embodiment, the second span beam 12 is temporarily fixed to the first temporary support 106 and each of the second temporary supports 107.

[0072] Optionally, step S4 further includes: fixing a first lifting lug 7 at the end of the first span beam 11 away from the second pier 102, and connecting the first stay cable 4 to the first lifting lug 7. Step S7 further includes: fixing a second lifting lug 8 at the end of the second span beam 12 away from the first span beam 11, and connecting the second stay cable 5 to the second lifting lug 8. By setting the first lifting lug 7 on the first span beam 11, it is convenient to connect the first stay cable 4 and the first span beam 11; by setting the second lifting lug 8 on the second span beam 12, it is convenient to connect the second stay cable 5 and the second span beam 12. In step S10, the first lifting lug 7 and the second lifting lug 8 are removed. In this embodiment, the top of the tower 3 is also provided with a third lifting lug 31 and a fourth lifting lug 32, the third lifting lug 31 being connected to the first stay cable 4, and the fourth lifting lug 32 being connected to the second stay cable 5.

[0073] Optionally, between steps S4 and S5, step S11 is further included: installing a second counterweight on the first span beam 11 between the second pier 102 and the third pier 103 to balance the first span beam 11 with the second counterweight. The setting of the second counterweight helps the first span beam 11 to maintain its horizontal position, facilitates the rotation of the first span beam 11, and extends the maximum length of the first span beam 11.

[0074] Optionally, in step S2: the first span beam 11 is temporarily fixed to each of the supporting piers 100; to facilitate the safe and reliable installation of the second configuration component, the method further includes, between step S11 and step S5: releasing the fixed connection between the first span beam 11 and each supporting pier 100. In this embodiment, the first span beam 11 is fixed to the first temporary support 106.

[0075] This embodiment also provides a bridge constructed using the aforementioned cross-bridge rotation construction method.

[0076] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A method for rotating construction of span bridges, characterized in that, Multiple piers are erected at intervals along the course of the span bridge. Each pier includes a first pier, a second pier, and a third pier that are sequentially adjacent to each other. There is an existing structure between the second pier and the third pier. The construction method includes the following steps: S1. Install the rotating base: The rotating base is installed on the second pier; S2. Install the first span beam: The first span beam is installed on the first pier and the rotating base; S3. Erecting a cable tower: Erecting a cable tower on the first span beam, with the cable tower located directly above the rotating base; S4. Connecting the first stay cable: One end of the first stay cable is connected to the tower, and the other end is connected to the end of the first span beam away from the second pier; S5. The rotating seat rotates 180°, causing the first span beam, together with the tower and the first cable-stayed cable, to rotate 180° synchronously. The end of the first span beam connected to the first cable-stayed cable is located between the second pier and the third pier. S6. Install the second span beam: The second span beam is installed on the first pier and several piers on the side of the first pier away from the second pier. One end of the second span beam is fixedly connected to the end of the first span beam away from the first cable to form a whole span beam. The length of the second span beam is greater than the distance between the second pier and the third pier. S7. Connecting the second stay cable: One end of the second stay cable is connected to the tower, and the other end is connected to the end of the second span beam away from the first span beam; S8. Install a first counterweight on the first span beam between the second pier and the third pier to balance the entire span beam with the first counterweight. S9. The rotating seat rotates 180°, causing the entire span beam, together with the tower, the first counterweight, the first stay cable, and the second stay cable, to rotate 180° synchronously. The entire span beam is supported by the first pier, the rotating seat, the third pier, and several piers on the side of the third pier away from the second pier. S10. Remove the cable tower, the first stay cable, the second stay cable and the first counterweight, replace the rotating seat with the first support, and fix the whole span beam on each of the bridge piers.

2. The method for rotating construction of a span bridge according to claim 1, characterized in that, The first span beam includes multiple first segment beams. Step S2 further includes: installing and splicing each of the first segment beams using a segmented hoisting process to form the first span beam.

3. The method for rotating construction of a span bridge according to claim 1, characterized in that, The second span beam includes multiple second segment beams. Step S6 further includes: installing and splicing each second segment beam using a segmented hoisting process to form the second span beam.

4. The method for rotating construction of a span bridge according to claim 1, characterized in that, Between steps S6 and S8, the second span beam is temporarily fixed to each of the piers supporting it. Between steps S8 and S9, the second span beam is released from its fixed connection with each of the supporting piers.

5. The method for rotating construction of a span bridge according to claim 1, characterized in that, Step S2 includes: installing a first temporary support on the first pier, and installing the first span beam on the first temporary support; Step S6 includes: pre-installing second temporary supports on each of the piers where the second span beam is installed, and the second span beam is installed on the first temporary support and each of the second temporary supports; Step S10 includes: replacing the first temporary support and each of the second temporary supports with a second support, and fixing the entire span beam to the first support and each of the second supports.

6. The method for rotating construction of a span bridge according to claim 1, characterized in that, In step S10, replacing the rotating seat with the first support includes: using jacks to lift the entire span beam, removing the rotating seat, installing the first support on the second pier, and using jacks to lower the entire span beam onto the first support.

7. The method for rotating construction of a span bridge according to claim 1, characterized in that, Step S4 further includes: fixing a first lifting lug at the end of the first span beam away from the second pier, and connecting the first stay cable to the first lifting lug; and / or, Step S7 further includes: fixing a second lifting lug on the end of the second span beam away from the first span beam, and connecting the second stay cable to the second lifting lug.

8. The method for rotating construction of a span bridge according to any one of claims 1-7, characterized in that, Between steps S4 and S5, there is also step S11, in which a second counterweight is installed on the first span beam between the second pier and the third pier to balance the first span beam and the second counterweight.

9. The method for rotating construction of a span bridge according to claim 8, characterized in that, In step S2: the first span beam is temporarily fixedly connected to each of the piers supporting it; Between step S11 and step S5, the following step is also included: releasing the first span beam from the fixed connection between it and each of the bridge piers supporting it.

10. A bridge, characterized in that, The bridge is constructed using the rotating construction method for span bridges as described in any one of claims 1-9.

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