Construction method of cyclically updating a suspension bridge

Abstract

The application discloses a construction method of cyclically updating a suspension bridge, and belongs to the technical field of bridge engineering. The construction method comprises the following steps: when the steel box girder reaches the service life, disconnect the connection between the left and right box chambers of the steel box girder, so that the left and right box chambers work independently; at this time, one side of the box chamber is used for traffic, and the other side of the box chamber is used for replacement; when the tower column or the main cable reaches the service life, first, newly build part of the pile cap and the pile foundation on the outer side of the bridge, then newly build the tower column and lengthen the tower column beam; when the main tower is constructed, the hydraulic climbing formwork machine is arranged on the old tower column, the new tower column is gradually climbed and poured, after the construction of the new tower column is completed, the hydraulic climbing formwork machine is used as the enclosure measure, the old tower column is gradually removed downwards, and the hanger cable, the main cable and the anchor are newly built; the steel box girder is connected with the newly built main cable through the newly built hanger cable, then the steel box girder is fixed with the newly built tower column and the anchor, and finally, the old tower column, the main cable, the hanger cable and the anchor are removed.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, and in particular to a construction method for a cyclically renewable suspension bridge. Background Technology

[0002] A suspension bridge is a common type of bridge, characterized by a bridge deck suspended in mid-air by a series of suspension cables. These cables are attached to the bridge deck at one end and to bridge towers or piers at the other. Suspension bridges are commonly used to span long distances across rivers, canyons, or other geographical obstacles.

[0003] When the main structural components of a suspension bridge reach the end of their service life, they require maintenance and replacement. While cable replacement technology is relatively mature, it is not yet possible to replace stiffening girders, especially the stiffening girders of steel box girders, and the main cables. As long-span bridges located on important transportation networks, the importance of suspension bridges is self-evident. If a suspension bridge is demolished and rebuilt in its original location after reaching its service life, it will inevitably disrupt traffic, causing significant disruption. Summary of the Invention

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a construction method for cyclically updating suspension bridges, which can maintain and replace the main components of the entire bridge while ensuring traffic flow, so that each component can be fully utilized.

[0005] A construction method for a cyclically updated suspension bridge according to an embodiment of the present invention includes:

[0006] First, the construction of the substructure anchorage, pile cap and pile foundation is carried out, then the tower column and tower column crossbeam are poured, and finally the main cable is erected and the steel box girder is hoisted. The steel box girder is divided into two box chambers, left and right.

[0007] When the steel box girder reaches the end of its service life, disconnect the connection between the left and right box chambers of the steel box girder so that the left and right box chambers can work independently. At this time, one side box chamber is used for traffic, and the other side box chamber is used for replacement.

[0008] When the tower or main cable reaches the end of its service life, a new abutment and pile foundation are first built on the outside of the bridge, and then the tower and extended tower beams are built. During the construction of the main tower, a hydraulic climbing formwork machine is used to gradually climb and pour the new tower. After the construction of the new tower is completed, the hydraulic climbing formwork machine is used as a protective measure to gradually dismantle the old tower and build new suspenders, main cables and anchorages. The steel box girder is connected to the new main cable through the new suspenders. Then the steel box girder is fixed to the new tower and anchorages. Finally, the old tower, main cable, suspenders and anchorages are removed.

[0009] The construction method for the cyclic renewal of a suspension bridge according to an embodiment of the present invention has at least the following beneficial effects: By dividing the steel box girder into two box chambers, left and right, connected in the middle by a transverse diaphragm and bolts, and setting transverse tension steel strands at the bottom of the girder, the main cable is located on both sides and connected to the steel box girder by suspenders. When replacing the steel box girder, a temporary suspender is set in the middle by a cable crane, and the bolt connection of the transverse diaphragm between the left and right box chambers and the prestressed steel strands at the bottom of the steel box girder are removed, thus separating the left and right box chamber structures. At this time, one box chamber is opened to traffic, and the other box chamber is dismantled and replaced segment by segment. After all segments are replaced in sequence, the steel box girder segments of the other box chamber are replaced in the same way. This method realizes the cyclic renewal of the steel box girder. When replacing piers and main cables, new structures such as pile foundations, abutments, towers, anchorages, main cables, and suspenders are constructed on one side of the existing structure. The suspension points between the steel box girder and the suspenders are adjusted to spare positions. The new suspenders are then connected to the steel box girder, allowing the old bridge's suspenders, main cables, and towers to be dismantled. This method enables the cyclical replacement of towers and main cables. This ensures traffic flow throughout the entire lifespan of the bridge, achieves cyclical renewal of each component, fully utilizes the service life of each component, effectively optimizes and conserves resources, and is green, economical, and environmentally friendly. It also solves the problem of increased costs associated with demolishing and rebuilding suspension bridges after their service life, which necessitates traffic disruption or rerouting.

[0010] According to some embodiments of the present invention, prestressed steel strands are provided at the bottom of the steel box girder, and the left and right boxes of the steel box girder are in a close fit under the action of the prestressed steel strands, and the left and right boxes are connected by steel box girder bolts and crossbeams.

[0011] According to some embodiments of the present invention, the steel box girder has pre-reserved lifting points for the slings required to replace the steel box girder.

[0012] According to some embodiments of the present invention, counterweights and temporary slings are set during the replacement of steel box girders to ensure that the main cable is under stable stress and the alignment remains unchanged.

[0013] According to some embodiments of the present invention, when replacing the steel box girder, a bridge inspection vehicle is used as the operating surface for construction personnel to disconnect the bolts and crossbeams of the steel box girder, remove the bottom prestressed steel strands, separate the left and right box girders of the steel box girder, and suspend the steel box girder by a cross-cable crane, slings and temporary slings, so that the left and right box girders can work independently. At this time, half of the road is used for traffic, and the other half of the steel box girder is replaced.

[0014] According to some embodiments of the present invention, the position of the sling is interchanged with the position of the sidewalk each time the sling is changed.

[0015] According to some embodiments of the present invention, the original suspension cable is located on one side of the sidewalk, a new suspension cable is built at the location of the sidewalk, and the sidewalk is adjusted to the location of the original suspension cable.

[0016] According to some embodiments of the present invention, when the original suspension cable is located inside the sidewalk and the suspension cable is replaced, a new structure is built on the outside to replace the steel box girder, tower column and anchorage, and the suspension point of the suspension cable is adjusted to the outside and the sidewalk is adjusted to the inside.

[0017] According to some embodiments of the present invention, when the original suspension cable is located outside the sidewalk and the suspension cable is replaced, a new structure is built on the inside to replace the steel box girder, tower column and anchorage, and the suspension point of the suspension cable is adjusted inward and the sidewalk is adjusted outward.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0020] Figure 1 This is a schematic diagram of the bridge structure in the construction method of the cyclically updated suspension bridge according to an embodiment of the present invention;

[0021] Figure 2 yes Figure 1 Cross-sectional view;

[0022] Figure 3 yes Figure 1 A partial enlarged view of the connection structure between the left and right compartments;

[0023] Figure 4 This is a schematic diagram of replacing the steel box girder in the construction method of a cyclically updated suspension bridge according to an embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of lifting a steel box girder in the construction method of a cyclically updated suspension bridge according to an embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of the replacement of tower columns and main cables in the construction method of a cyclically renewed suspension bridge according to an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the cable replacement process in the construction method of a cyclically updated suspension bridge according to an embodiment of the present invention.

[0027] Figure 8 This is a cross-sectional view of the hydraulic climbing formwork machine in the construction method of the cyclically updated suspension bridge according to an embodiment of the present invention.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Steel box girder; 2. Tower column; 3. Main cable; 4. Suspension cable; 5. Anchorage; 61. Pile foundation; 62. Pier cap; 7. Steel box girder bolts; 8. Crossbeam; 9. Steel strand; 10. Temporary suspension cable; 11. Tower column crossbeam; 12. Hydraulic climbing formwork machine; 13. Cable crossing crane; 14. Counterweight; 15. Bridge inspection vehicle. Detailed Implementation

[0030] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0031] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and 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 limiting this invention.

[0032] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0033] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0034] refer to Figures 1 to 8 A construction method for a cyclically updated suspension bridge according to an embodiment of the present invention is described.

[0035] like Figures 1 to 8 As shown, the construction method for a cyclically renewable suspension bridge according to an embodiment of the present invention includes:

[0036] First, the construction of the lower structure anchor 5, pile cap 62 and pile foundation 61 is carried out, then the tower column 2 and tower column crossbeam 11 are poured, and finally the main cable 3 is erected and the steel box girder 1 is hoisted. The steel box girder 1 is divided into two box chambers, left and right.

[0037] When the steel box girder 1 reaches the end of its service life, disconnect the connection between the left and right box chambers of the steel box girder 1 so that the left and right box chambers can work independently. At this time, one side box chamber is used for traffic, and the other side box chamber is used for replacement.

[0038] When tower column 2 or main cable 3 reaches the end of its service life, first construct a new pier 62 and pile foundation 61 on the outside of the bridge, then construct tower column 2 and extended tower column crossbeam 11. During the construction of the main tower, use the old tower column 2 to set up a hydraulic climbing formwork machine 12 to gradually climb and pour the new tower column 2. After the construction of the new tower column 2 is completed, use the hydraulic climbing formwork machine 12 as a protective measure to gradually dismantle the old tower column 2 downwards, and construct new suspenders 4, main cables 3 and anchorages 5. Connect the steel box girder 1 to the new main cable 3 through the new suspenders 4, then fix the steel box girder 1 to the new tower column 2 and anchorages 5, and finally dismantle the abandoned old tower column 2, main cable 3, suspenders 4 and anchorages 5.

[0039] like Figures 2 to 5 As shown, prestressed steel strands 9 are installed at the bottom of the steel box girder 1. The left and right boxes of the steel box girder 1 are in a close fit under the action of the prestressed steel strands 9, and are connected by steel box girder bolts 7 and crossbeams 8. The steel box girder 1 has reserved lifting points for the slings 4 required for replacing the steel box girder 1. During the replacement of the steel box girder 1, counterweights 14 and temporary slings 10 are set to ensure the main cable 3 is under stable stress and the alignment remains unchanged. When replacing the steel box girder 1, the bridge inspection vehicle 15 is used as the working surface for construction personnel. The steel box girder bolts 7 and crossbeams 8 are disconnected, and the bottom prestressed steel strands 9 are removed, so that the left and right boxes of the steel box girder 1 are separated. The steel box girder 1 is then suspended by the cable crane 13, slings 4 and temporary slings 10, so that the left and right boxes can work independently. At this time, one half of the road is used for traffic, and the other half of the steel box girder 1 is replaced.

[0040] like Figures 6 to 8 As shown, each time the suspension cable 4 is replaced, its position is swapped with that of the sidewalk. When the original suspension cable 4 is located on one side of the sidewalk, a new suspension cable 4 is constructed at the sidewalk location, and the sidewalk is adjusted to the original suspension cable 4 position. When the original suspension cable 4 is located inside the sidewalk, during replacement, a new structure is constructed on the outside, replacing the steel box girder 1, tower column 2, and anchorage 5, and the suspension point of suspension cable 4 is adjusted outwards, while the sidewalk is adjusted inwards. When the original suspension cable 4 is located outside the sidewalk, during replacement, a new structure is constructed on the inside, replacing the steel box girder 1, tower column 2, and anchorage 5, and the suspension point of suspension cable 4 is adjusted inwards, while the sidewalk is adjusted outwards.

[0041] The following is a specific construction example illustrating the construction method of this cyclically updated suspension bridge:

[0042] The construction of the suspension bridge begins with the construction of the substructure anchorage 5, abutment 62, and pile foundation 61. Then, the tower column 2 and tower column crossbeam 11 are poured. Finally, the main cable 3 is erected and the steel box girder 1 is hoisted.

[0043] During the fabrication of the steel box girder 1, it is divided into two box chambers, left and right. Prestressed steel strands 9 are installed at the bottom of the girder. At this time, the middle part of the steel box girder 1 is in a tight state under the action of the steel strands 9, which facilitates the connection of the steel box girder bolts 7. The left and right box chambers are connected by the steel box girder bolts 7 and the crossbeams 8. The steel box girder 1 is pre-reserved with lifting points for the slings 4 required for future replacement of the steel box girder 1, which facilitates the replacement later. After the steel box girder 1 is hoisted, the auxiliary facilities are constructed, and finally the suspension bridge construction is completed.

[0044] The suspension bridge structure's deck load acts on the steel box girder 1, and is transferred to the main cable 3 via the suspenders 4. The main cable 3 then applies the load to the tower 2, anchorage 5, pier cap 62, and pile foundation 61. After the suspension bridge is put into use, the corresponding components will be replaced when the steel box girder 1, tower 2, or main cable 3 reaches the end of their service life.

[0045] When replacing steel box girder 1, bridge inspection vehicle 15 is used as the working surface for construction personnel. The bolts 7 and crossbeams 8 of the steel box girder are disconnected, and the bottom prestressed steel strands 9 are removed to separate the left and right box cavities of the steel box girder. The steel box girder 1 is then suspended by cable crane 13, sling 4 and temporary sling 10 so that the left and right box cavities can work independently. At this time, half of the road is used for traffic, and the other half of the steel box girder 1 is replaced.

[0046] When replacing one side of the steel box girder 1, the cable crane 13 uses lifting equipment to replace the steel box girder 1 in sections, removing one section at a time and lifting one section at a time. During the replacement process, counterweights 14 and temporary slings 10 are set to ensure that the main cable 3 is under stable stress and the alignment remains unchanged. After the construction of one side of the steel box girder 1 is completed, the other side of the steel box girder 1 is replaced.

[0047] When replacing tower column 2 and main cable 3, first construct a new abutment 62 and pile foundation 61 on the outside of the bridge, then construct tower column 2 and extended tower column crossbeam 11. During the construction of the main tower, use the old tower column 2 to set up a hydraulic climbing formwork machine 12 to gradually climb and pour the new tower column 2. After the construction of the new tower column is completed, the hydraulic climbing formwork machine 12 can be used as a retaining measure to gradually dismantle the old tower column 2 downwards. Then, construct the new main cable 3 and anchorage 5. The original suspension cable 4 is located on the right side of the sidewalk. Construct a new suspension cable 4 at the location of the sidewalk and adjust the sidewalk to the original position of suspension cable 4. Then, connect the steel box girder 1 to the new main cable 3 through the new suspension cable 4. Then, fix the steel box girder to the new tower column 2 and anchorage 5. After that, dismantle the old tower column 2, main cable 3, suspension cable 4 and anchorage 5.

[0048] like Figure 6As shown, when the suspension bridge is in State 1, replacing the steel box girder 1, tower column 2, and anchorage 5 involves constructing a new structure on the outer side, adjusting the suspension points of cable 4 outwards, and adjusting the pedestrian walkway inwards, thus adjusting the bridge to State 2. Once the bridge is in State 2 and has reached its next structural service life, replacing the steel box girder 1, tower column 2, and anchorage 5 involves constructing a new structure on the inner side, adjusting the suspension points of cable 4 inwards, and adjusting the pedestrian walkway outwards, thus adjusting the bridge to State 1. The bridge structure undergoes periodic adjustments and replacements based on its service life.

[0049] Using the above methods, after the components of the suspension bridge reach their service life, they are replaced in different ways depending on the location.

[0050] The construction method for this cyclical renewal suspension bridge involves dividing the steel box girder into two compartments, left and right, connected by a transverse diaphragm and bolts. Transverse tension steel strands are installed at the bottom of the girder. The main cables are located on both sides and connected to the steel box girder by suspenders. When replacing the steel box girder, a temporary suspender is installed in the middle using a cable crane. The bolted connection of the transverse diaphragm between the left and right compartments and the prestressed steel strands at the bottom of the steel box girder are removed, separating the left and right compartments. One compartment is then opened to traffic, while the other compartment is dismantled and replaced segment by segment. After all segments are replaced sequentially, the same method is used to replace the steel box girder segments of the other compartment, thus achieving cyclical renewal of the steel box girder. When replacing the piers and main cables, new pile foundations, abutments, towers, anchorages, main cables, and suspenders are constructed on one side of the structure. The lifting points between the steel box girder and the suspenders are adjusted to spare positions. The newly constructed suspenders are connected to the steel box girder, allowing the old bridge's suspenders, main cables, and towers to be dismantled. This method enables cyclical replacement of the towers and main cables.

[0051] This ensures uninterrupted traffic flow throughout the entire lifecycle, enables the cyclical renewal of each component, fully utilizes the service life of each part, effectively optimizes and conserves resources, and is green, economical, and environmentally friendly. It also solves the problem of increased costs associated with demolishing and rebuilding suspension bridges after their service life, which necessitates traffic disruptions or rerouting.

[0052] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A construction method for a cyclically renewing suspension bridge, characterized in that, include: First, the construction of the substructure anchorage, pile cap and pile foundation is carried out, then the tower column and tower column crossbeam are poured, and finally the main cable is erected and the steel box girder is hoisted. The steel box girder is divided into two box chambers, left and right. When the steel box girder reaches the end of its service life, disconnect the connection between the left and right box chambers of the steel box girder so that the left and right box chambers can work independently. At this time, one side box chamber is used for traffic, and the other side box chamber is replaced. When the tower column or main cable reaches the end of its service life, first construct a partial abutment and pile foundation on the outside of the bridge, then construct a new tower column and extend the tower column crossbeam. During the construction of the main tower, use the old tower column to set up a hydraulic climbing formwork machine to gradually climb and pour the new tower column. After the construction of the new tower column is completed, use the hydraulic climbing formwork machine as a protective measure to gradually dismantle the old tower column downwards, and construct new suspenders, main cables and anchorages. Connect the steel box girder to the new main cable through the new suspenders, then fix the steel box girder to the new tower column and anchorages, and finally dismantle the abandoned old tower column, main cable, suspenders and anchorages. Each time the slings are changed, their positions are swapped with those of the sidewalk. The original suspension cable was located on one side of the sidewalk. A new suspension cable will be built at the location of the sidewalk, and the sidewalk will be adjusted to the original position of the suspension cable. When the original suspension cable is located inside the sidewalk, and the suspension cable is replaced, the steel box girder, tower column and anchorage are replaced in the newly built structure on the outside, and the suspension cable suspension point is adjusted to the outside, and the sidewalk is adjusted to the inside. When the original suspension cable is located outside the sidewalk, and the suspension cable is replaced, a new structure is built on the inside to replace the steel box girder, tower column and anchorage, and the suspension cable suspension point is adjusted inward and the sidewalk is adjusted outward.

2. The construction method for a cyclically renewing suspension bridge according to claim 1, characterized in that, Prestressed steel strands are installed at the bottom of the steel box girder. The left and right boxes of the steel box girder are in close contact under the action of the prestressed steel strands and are connected by bolts and crossbeams.

3. The construction method for a cyclically renewing suspension bridge according to claim 2, characterized in that, The steel box girder has pre-reserved lifting points inside for the slings needed to replace the steel box girder.

4. The construction method for a cyclically renewing suspension bridge according to claim 3, characterized in that, During the replacement of the steel box girder, counterweights and temporary slings were installed to ensure the main cable was under stable stress and that its alignment remained unchanged.

5. The construction method for a cyclically renewing suspension bridge according to claim 4, characterized in that, When replacing the steel box girder, a bridge inspection vehicle is used as the operating surface for construction personnel. The bolts and crossbeams of the steel box girder are disconnected, and the bottom prestressed steel strands are removed to separate the left and right box girders of the steel box girder. The steel box girder is then suspended by a cable crane, slings, and temporary slings to allow the left and right box girders to work independently. At this time, one half of the road is used for traffic, and the other half of the steel box girder is replaced.

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