Cable-stayed bridge and construction method thereof

Abstract

The application discloses a cable-stayed bridge and a construction method thereof. The construction method comprises the following steps: taking a cable tower as a center, defining a construction interval of a beam body along a main beam structure, and dividing the construction interval into a plurality of construction sections, each of which is constructed simultaneously to two sides of the beam body length direction with the cable tower as the center and is provided with a pair of stay cables; forming a partial beam body after partial construction sections are constructed, connecting a first end of a stay cable in at least one construction section to the formed partial beam body and a second end of the stay cable to a permanent counterforce support point at a side pier or another segment of the beam body adjacent to the partial beam body to form a counter-pulling stay cable, and the two ends of the counter-pulling stay cable are located on the same side of the cable tower; closing the beam body; disconnecting the second end of the counter-pulling stay cable from the permanent counterforce support point at the side pier or the other segment of the beam body, and connecting the second end to the cable tower of the beam body where the first end is located. The method can reduce the axial pressure of the main beam, and improve the span limit and stability of the cable-stayed bridge in the construction process.

Description

Technical Field

[0001] This invention belongs to the field of manufacturing, and more specifically, relates to a cable-stayed bridge and its construction method. Background Technology

[0002] Cable-stayed bridges are characterized by their good span capacity, wide applicability, and moderate cost, making them one of the best bridge types for kilometer-long spans. The main load-bearing components of a cable-stayed bridge include the main girder, towers, and cables. The main girder primarily bears axial forces and local bending moments, while the cables primarily bear gravity. While providing vertical support to the main girder, the cables also generate axial stress. Especially for ultra-long-span cable-stayed bridges, the number of cables required is greater, the main girder is heavier, and the problem of accumulated axial forces is more severe. Therefore, the main girder at the root position needs to withstand greater axial stress, becoming a major design factor for cable-stayed bridges. Summary of the Invention

[0003] This invention is primarily based on the following problems and findings:

[0004] To facilitate construction and achieve the desired span, cable-stayed bridges, especially long-span cable-stayed bridges, often employ the balanced cantilever construction method. This method involves setting up working platforms on both sides of the pylons, and then pouring or assembling beam segments in a balanced manner towards the middle / side spans, fixing the cables segment by segment until the bridge structure is closed. However, this method causes the axial pressure on the main beam to gradually accumulate. For ultra-long-span cable-stayed bridges exceeding one kilometer in length, this cumulative effect of axial pressure becomes even more pronounced, becoming one of the key factors limiting the design of the main beam and even the entire bridge.

[0005] This invention aims to at least partially solve one of the technical problems in related technologies. Therefore, one objective of this invention is to propose a cable-stayed bridge and its construction method. This method can reduce the axial pressure on the main girder, which is beneficial for increasing the span limit of the cable-stayed bridge, while also improving the stability of the cable-stayed bridge during construction and use.

[0006] In one aspect of the invention, a construction method for a cable-stayed bridge is provided. According to an embodiment of the invention, the cable-stayed bridge includes a main girder, towers, and cables. The main girder includes at least one section of girder body, each section of girder body having at least one tower. The construction process includes:

[0007] (1) With the tower as the center, the construction area of ​​the beam is defined along the main beam structure, and the construction area is divided into multiple construction segments. Each construction segment is constructed simultaneously on both sides of the beam length direction with the tower as the center and is equipped with a pair of cables.

[0008] (2) After constructing some sections, a partial beam is formed. In the remaining construction sections, the first end of the cable in at least one construction section is connected to the partially formed beam, and the second end is connected to the permanent reaction support point at the side pier or another beam adjacent to the partially formed beam to form a tie cable. The two ends of the tie cable are located on the same side of the tower.

[0009] (3) The beam body is then joined together;

[0010] (4) Disassemble the second end of the tie cable to the permanent reaction support point at the side pier or another section of the beam, and connect the second end to the tower of the beam where the first end is located.

[0011] According to the construction method of the cable-stayed bridge of the present invention, by setting up tie cables during construction, it is not only beneficial to improve the integrity of the main beam structure during construction, but also to effectively reduce the axial pressure of the main beam, which helps to improve the safety and stability of the construction stage. In addition, by setting up tie cables, the cumulative axial pressure borne by the main beam after the bridge is completed can also be reduced, which is beneficial to improving the span limit of the cable-stayed bridge and provides the possibility for the design and construction of ultra-large span cable-stayed bridges. Furthermore, this method makes full use of the performance of existing components, using existing cables as temporary tie cables during construction. After the beam is closed, the tie cables are then disassembled from the permanent reaction support point at the pier or the end connected to another section of the beam, and the cables are hung and tensioned again. This method has a high utilization rate of raw materials and low construction costs.

[0012] In addition, the construction method of the cable-stayed bridge according to the above embodiments of the present invention may also have the following additional technical features:

[0013] In some embodiments of the present invention, in step (2), the remaining construction segments include m construction segments, m1 construction segments are equipped with inclined stay cables, m2 construction segments are equipped with the anti-stay cables, m = m1 + m2, m, m1, and m2 are all independent positive integers, and m is not less than 2.

[0014] In some embodiments of the present invention, the remaining construction segments are alternately constructed by setting up the stay cables and the anti-stay cables.

[0015] In some embodiments of the present invention, the last construction segment of the remaining construction segments is provided with the cable-stayed cable.

[0016] In some embodiments of the present invention, at least a portion of the tension cables are made of carbon fiber composite material.

[0017] In some embodiments of the present invention, at least a portion of the cable stays in the remaining construction segments are made of carbon fiber composite material.

[0018] In some embodiments of the present invention, in step (2), a partial beam is formed after partial construction segments are constructed, and each of the partial construction segments is independently equipped with a stay cable.

[0019] In some embodiments of the present invention, at least a portion of the stay cables in the partial construction segment are made of carbon fiber composite material.

[0020] In some embodiments of the present invention, the cable-stayed bridge comprises multiple beam segments, which are joined together to form the main beam.

[0021] In some embodiments of the present invention, the construction of foundation, piers and towers is included before step (1).

[0022] In some embodiments of the present invention, it further includes: (5) dismantling the remaining temporary construction equipment and construction ancillary facilities.

[0023] In another aspect, the present invention proposes a cable-stayed bridge. According to an embodiment of the invention, the cable-stayed bridge is constructed using the method described above. This cable-stayed bridge possesses all the features and effects of the construction method described above, which will not be repeated here. In general, compared with the prior art, the main girder of this cable-stayed bridge experiences less axial pressure, exhibits higher stability and safety during its construction and use, helps to improve its span limit, and provides possibilities for the design and construction of ultra-large span cable-stayed bridges.

[0024] In some embodiments of the present invention, the towers of the cable-stayed bridge are connected to carbon fiber composite cables.

[0025] In some embodiments of the present invention, the carbon fiber composite cable is located on the side of the tower near the end of the beam.

[0026] 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

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0028] Figure 1 This is a flowchart of a construction method for a cable-stayed bridge according to an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of a cable-stayed bridge according to an embodiment of the present invention;

[0030] Figures 3-8This is a structural schematic diagram of a cable-stayed bridge during different construction stages according to an embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of the structure of a cable-stayed bridge according to Embodiment 1 of the present invention;

[0032] Figure 10 This is a schematic diagram of the stress state of the main girder of a cable-stayed bridge according to an embodiment of the present invention. Detailed Implementation

[0033] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. In the description of the present invention, it should be understood that the terms "center," "length," "width," "upper," "lower," "axial," "radial," etc., indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present 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, and therefore should not be construed as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0034] In this invention, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," and "fixing" 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact through an intermediate medium. Furthermore, "above," "on top of," and "on top" can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0035] In one aspect of the invention, a construction method for a cable-stayed bridge is provided. According to an embodiment of the invention, the cable-stayed bridge includes a main girder, pylons, and cables. The main girder includes at least one section of girder body, each section of girder body having at least one pylon. The construction process includes:

[0036] (1) The construction area of ​​the beam is defined along the main beam structure with the tower as the center, and the construction area is divided into multiple construction segments. Each construction segment is constructed simultaneously along the length of the beam with the tower as the center and is equipped with a pair of cables.

[0037] (2) After some construction segments are completed, a partial beam is formed. In the remaining construction segments, the first end of the cable in at least one construction segment is connected to the partially formed beam, and the second end is connected to the permanent reaction support point at the side pier or another beam adjacent to the partially formed beam to form a tie cable. The two ends of the tie cable are located on the same side of the tower.

[0038] (3) Close the beam structure;

[0039] (4) Disassemble the second end of the cable to the permanent reaction support point at the side pier or another section of the beam, and connect the second end to the tower of the beam where the first end is located.

[0040] According to the construction method of the cable-stayed bridge of the present invention, by setting up tie cables during construction, it is not only beneficial to improve the integrity of the main beam structure during construction, but also to effectively reduce the axial pressure of the main beam, which helps to improve the safety and stability of the construction stage. In addition, by setting up tie cables, the cumulative axial pressure borne by the main beam after the bridge is completed can also be reduced, which is beneficial to improving the span limit of the cable-stayed bridge and provides the possibility for the design and construction of ultra-large span cable-stayed bridges. Furthermore, this method makes full use of the performance of existing components, using existing cables as temporary tie cables during construction. After the beam is closed, the tie cables are then disassembled from the permanent reaction support point at the pier or the end connected to another section of the beam, and the cables are hung and tensioned again. This method has a high utilization rate of raw materials and low construction costs.

[0041] The following is for reference. Figure 1 The construction method of the cable-stayed bridge according to the above embodiments of the present invention will be described in detail.

[0042] S100: Centered on the pylon, the construction area of ​​the beam is defined along the main beam structure, and the construction area is divided into multiple construction segments. Each construction segment is constructed simultaneously on both sides along the length of the beam centered on the pylon and is equipped with a pair of cables.

[0043] According to an embodiment of the present invention, in combination Figure 2 To understand, a cable-stayed bridge comprises a main girder 10, towers 20, and cables 30. The main girder 10 consists of at least one girder segment, and each segment has at least one tower. Figure 2 Taking the cable-stayed bridge shown as an example, the cable-stayed bridge may include a first beam 11 and a second beam 12. The first beam 11 may have a first tower 21 or a pair of first towers 21 symmetrically distributed along the width direction of the beam. The second beam 12 may have a second tower 22 or a pair of second towers 22 symmetrically distributed along the width direction of the beam.

[0044] According to an embodiment of the present invention, in combination Figures 3-4 To illustrate, taking a cable-stayed bridge comprising two beam sections as an example, during construction, the construction area of ​​the beam is defined according to the designed main beam structure, centered on the first tower 21 and the second tower 22. This construction area is then divided into multiple construction segments. Within each segment, construction proceeds simultaneously along both sides of the beam's length, centered on towers 21 and 22. At least one pair of cables 30 are installed on both sides of the first tower 21, forming a first beam section 11. Similarly, at least one pair of cables 30 are installed on both sides of the second tower 22, forming a second beam section 12. It should be noted that the number of construction segments in this step is not specifically limited in this invention. Those skilled in the art can flexibly choose according to the actual situation; for example, only one construction segment can be constructed, with a pair of cables on both sides of each tower (in conjunction with...). Figure 3(Understanding) It can also be constructed in multiple segments, so that each tower has multiple pairs of cables on both sides (in combination with) Figure 4 understand).

[0045] S200: After constructing partial sections, a partial beam is formed. In the remaining construction sections, the first end of a cable in at least one construction section is connected to the formed partial beam, and the second end is connected to the permanent reaction support point at the side pier or another beam section adjacent to that partial beam, forming a tie cable. The two ends of the tie cable are located on the same side of the tower.

[0046] According to an embodiment of the present invention, after a portion of the construction segments are completed according to step S100, a partial beam can be formed (combined with...). Figures 3-4 (Understanding) In this part of the construction segment, each construction segment can be independently equipped with cable stays. In this invention, there are no special restrictions on the specific material of the cable stays used in this part of the construction segment. Those skilled in the art can flexibly choose according to the actual situation. For example, it can be steel cable stays or carbon fiber composite cable stays. Among them, using steel cable stays as cable stays is more conducive to controlling construction costs, while using carbon fiber composite cable stays as cable stays is more conducive to improving the support strength of the beam and reducing the overall weight of the bridge.

[0047] According to an embodiment of the present invention, in the remaining construction segments, combined with Figure 5 Understanding this, a tie cable 30a in at least one construction segment is connected at its first end to the existing beam and at its second end to a permanent reaction support point at the pier or to another beam segment adjacent to that segment, forming a tie cable 30a. The two ends of the tie cable 30a are located on the same side of the tower (i.e., the two ends of the tie cable are located on the same side of the tower along the beam's length). This provides tension to the existing beam segment, balancing the axial pressure on a portion of the beam. This not only improves the safety and stability of the construction process but also helps to increase the maximum span achievable for ultra-long-span cable-stayed bridges. According to some specific examples of the invention, combined with... Figure 5To illustrate, taking a cable-stayed bridge comprising two girder segments and at least two towers as an example, after constructing a portion of the construction segments according to step S100, a partial first girder 11 and a partial second girder 12 can be formed. The girder between the first tower 21 and the second tower 22 is the mid-span girder; the girder between the first tower 21 and the permanent reaction support point 41 at the same side pier is the first side-span girder; and the girder between the second tower 22 and the permanent reaction support point 42 at the same side pier is the second side-span girder. In each remaining construction segment, with the first tower 21 and the second tower 22 as the center, extending towards both sides along the length of the girder... Simultaneous construction ensures that one end of the cable in the middle span of at least one construction segment is connected to the middle span of the first beam 11, and the other end is connected to the middle span of the second beam 12. At the same time, one end of the cable in the first side span is connected to the first beam 11, and the other end is connected to the permanent reaction support point 41 at the side pier adjacent to the first beam 11. One end of the cable connecting the second side span is connected to the second beam 12, and the other end is connected to the permanent reaction support point 42 at the side pier adjacent to the second beam 12. This achieves the counter-tensioning of the cables, and makes the two ends of the counter-tensioning cables located on the same side of the tower.

[0048] According to an embodiment of the present invention, in combination Figures 5-6 Understand that the remaining construction segments can include m construction segments, of which m1 construction segments can be equipped with stay cables, with both ends of the stay cables connected to the tower 20 and the beam 10 respectively, and m2 construction segments can be equipped with tie cables, with one end of the tie cable connected to the already formed part of the beam and the other end connected to the permanent reaction support point at the side pier or another beam segment adjacent to that part of the beam, m = m1 + m2, where m, m1, and m2 are all independent positive integers, and m is not less than 2. Furthermore, in the remaining construction segments, there are no particular restrictions on the specific methods for setting up the stay cables and the tie cables. Those skilled in the art can choose flexibly according to the actual situation. For example, the construction segments for setting up stay cables and the construction segments for setting up tie cables can be carried out alternately, or a tie cable construction segment can be carried out after every two or three stay cable construction segments. That is, the values ​​of m1 and m2 can be equal or unequal. In addition, m1 can not be less than m2. Optionally, the construction segments for setting up stay cables and the construction segments for setting up tie cables can be carried out alternately. Choosing this method is more conducive to making the beam body subject to uniform tension and compression, further improving the stability of the beam body during construction, and reducing the compressive stress borne by the main beam after the bridge is completed.

[0049] According to an embodiment of the present invention, in the remaining construction segments, the last construction segment can be used to install the stay cables, thereby facilitating the subsequent closure of the beam and relieving the axial pressure on the beam.

[0050] S300: Closure of the beam structure

[0051] According to an embodiment of the present invention, after the construction of the beam section is completed, the beam is joined together to form the main beam structure. Taking a cable-stayed bridge comprising two beam sections as an example, combined with... Figure 6 It is understood that after all construction segments are completed, the first beam 11 and the second beam 12 will be closed in the middle span and on the side span to form the main beam, so that the main beam can bear the tensile force of the subsequent transfer of temporary tie cables.

[0052] S400: Disassemble the second end of the tension cable to the permanent reaction support point at the pier or another section of the beam, and connect the second end to the tower of the beam where the first end is located.

[0053] According to an embodiment of the present invention, in combination Figure 7 Understanding is that after the main beam structure is formed, one end of each tie cable is released and the anchorage position is changed. According to the design cable force, one end of the tie cable is connected to the permanent reaction support point at the side pier or to the tower of the other end of the beam after disassembly. In other words, the original tie cables are re-connected to the main beam and the tower by diagonal tension. The process of releasing the tie cables one by one can be carried out symmetrically with the mid-span beam as the center, which is more conducive to the stress balance of the main beam and improves the safety and stability during the construction phase.

[0054] According to embodiments of the present invention, at least a portion of the stay cables can be made of carbon fiber composite material. This allows for the utilization of the high strength, large deformation, and low sag characteristics of carbon fiber composite material to facilitate the installation of stay cables, thereby improving the operability and stability of the construction process. Furthermore, in the remaining construction segments, at least a portion of the stay cables can also be made of carbon fiber composite material, further improving the portability of the tension cables and enhancing the stability of the construction phase.

[0055] According to an embodiment of the present invention, in combination Figure 8 It is understood that prior to step S100, construction may include foundation work, pier 40 and tower 21 construction, etc., to provide a foundation for subsequent construction segments. Furthermore, the construction method for cable-stayed bridges may also include:

[0056] S500: Dismantle the remaining temporary construction equipment and ancillary facilities.

[0057] According to an embodiment of the present invention, the remaining temporary construction equipment and construction ancillary facilities are removed in order to complete the entire bridge construction.

[0058] In another aspect, the present invention proposes a cable-stayed bridge. According to an embodiment of the invention, the cable-stayed bridge is constructed using the method described above. This cable-stayed bridge possesses all the features and effects of the construction method described above, which will not be repeated here. In general, compared with the prior art, the main girder of this cable-stayed bridge experiences less axial pressure, exhibits higher stability and safety during its construction and use, helps to improve its span limit, and provides possibilities for the design and construction of ultra-large span cable-stayed bridges.

[0059] According to an embodiment of the present invention, the towers of a cable-stayed bridge can be connected with carbon fiber composite cables. This not only makes full use of the high strength, large deformation, and low sag characteristics of carbon fiber cables, but also allows for the temporary installation of cables during construction, reducing the axial pressure on the main beam of the cable-stayed bridge, and improving the overall stability and safety of the cable-stayed bridge.

[0060] According to embodiments of the present invention, there is no particular limitation on the number of carbon fiber composite cables. Those skilled in the art can choose flexibly according to the actual situation. For example, carbon fiber composite cables can be set on the side of the tower near the end of the beam, which can not only reduce the axial pressure on the main beam of the cable-stayed bridge, but also help control the construction cost of the cable-stayed bridge.

[0061] In summary, the construction method of the cable-stayed bridge using the above embodiments of the present invention, or the cable-stayed bridge using the above embodiments of the present invention, can have the following beneficial effects:

[0062] (1) Reduce the axial pressure on the main beam. By applying tension during construction, the axial pressure on the main beam at the root position in the completed bridge state can be reduced;

[0063] (2) Make full use of the performance of existing components. Make full use of existing cables as temporary tie cables for construction. After the temporary tie cables are removed during construction, the cables are hung and tensioned for the completed bridge. Make full use of the high strength, large deformation and low sag of carbon fiber cables to complete the setting of temporary tie cables for the main beam construction. Make full use of the compressive and tensile properties of steel to make the main beam uniformly stressed by tension and compression.

[0064] (3) Improve safety during construction. During construction, the temporary tension cables during the mid-span symmetrical tensioning construction help improve the overall integrity of the main beam, thereby improving the safety and stability during the construction phase;

[0065] (4) Increase the span of cable-stayed bridges. By reducing the axial pressure on the main girder, which plays a major role in limiting the span of cable-stayed bridges, it is equivalent to increasing the span of achievable ultra-large span cable-stayed bridges, providing a possibility for the design and construction of ultra-large span cable-stayed bridges.

[0066] The embodiments of the present invention are described in detail below. The embodiments described below are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention. Where specific techniques or conditions are not specified in the embodiments, they shall be performed in accordance with the techniques or conditions described in the literature in the art or in accordance with the product manual.

[0067] Example 1

[0068] (1) Foundation construction, pier and tower construction, etc. Among them, four piers are set at each end of the main beam structure, the distance between the centers of two adjacent piers is 92m, the total height of the tower is 392.2m, and the height of the tower above the beam is 322.2m.

[0069] (2) Figures 3-4 As shown, with the first tower 21 and the second tower 22 as the center, the construction area of ​​the beam is defined along the main beam structure, and the construction area is divided into 44 construction segments. First, in each construction segment, steel cables are used to cantilever construction segment by segment from the first tower 21 and the second tower 22 to both sides of the beam length direction. The first 22 construction segments are completed, forming part of the first beam 11 and part of the second beam 12. Part of the first beam 11 and part of the second beam 12 are symmetrically distributed around the center of the main beam structure. The lengths of the part of the first beam and part of the second beam are equal, each being 1 / 4 of the total length of the main beam. In the first 22 construction segments, the beam length formed on one side of each tower is 20m.

[0070] (3) Figure 5 As shown, in the remaining 22 construction segments, carbon fiber composite materials are used as cables. Among them, 11 construction segments are equipped with inclined cables and 11 construction segments are equipped with tie cables. The construction segments with inclined cables and the construction segments with tie cables are carried out alternately. The construction method of the inclined cables is the same as step (2). One end of the tie cable connecting the middle span beam is connected to the middle span of the first beam 11, and the other end is connected to the middle span of the second beam 12. One end of the cable connecting the first side span beam is connected to the first beam, and the other end is connected to the permanent reaction support point at the side pier adjacent to the first beam. One end of the cable connecting the second side span beam is connected to the second beam, and the other end is connected to the permanent reaction support point at the side pier adjacent to the second beam. In the remaining 22 construction segments, the beam length formed by each construction segment in the middle span is 20m, and the beam length formed by each construction segment in the side span is 12m.

[0071] (4) Figure 6 As shown, the first beam 11 and the second beam 12 are joined together to form the main beam, wherein the closure length of the middle span is 16m and the closure length of the side span is 12m, and the total length of the main beam is 3032m.

[0072] (5) Figure 7 As shown, the tie cables are released one by one, the anchorage positions are changed, and the original tie cables are re-tensioned and connected to the main beam and the corresponding towers according to the design cable force, so as to realize the redistribution of the cable force of the entire bridge and gradually transfer the tension to be borne by the main beam.

[0073] (6) Remove the temporary restraints on the main beam to complete the stress transfer of the entire bridge, resulting in a cable-stayed bridge as follows: Figure 9 As shown.

[0074] Comparative Example 1

[0075] (1) Foundation construction, pier and cable tower construction, etc.;

[0076] (2) Taking the first tower 21 and the second tower 22 as the center, the construction area of ​​the beam is defined along the main beam structure, and the construction area is divided into 44 construction segments. In each construction segment, steel cables are used to construct the beam segment by segment from the first tower 21 and the second tower 22 as the center to both sides of the beam length direction. The first beam 11 and the second beam 12 are joined together to form the main beam, which has a total length of 3032m.

[0077] (3) Remove the temporary restraints on the main beam and the entire bridge is completed.

[0078] The stress state of the main girder of the cable-stayed bridges in Example 1 and Comparative Example 1 was characterized, and the characterization results are as follows: Figure 10 As shown, the shaded area below the main beam 10 represents the compressive stress borne by the main beam. The size of the shaded area corresponding to different positions of the main beam represents the magnitude of the compressive stress borne by the main beam at that position. The shaded area above the main beam 10 represents the tensile stress borne by the main beam. Similarly, an increase in the area of ​​the shaded area above the main beam 10 indicates an increase in the tensile stress received by the main beam in that region. Figure 10 As can be seen, compared with Comparative Example 1, the axial compressive stress of the cable-stayed bridge obtained by adopting the construction method of the above embodiment 1 of the present invention is reduced and the tensile stress is increased, and the uniformity of tensile and compressive stress on the main beam is improved. This is beneficial to improving the span limit of the cable-stayed bridge and providing possibilities for the design and construction of ultra-large span cable-stayed bridges.

[0079] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0080] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A construction method for a cable-stayed bridge, characterized in that, The cable-stayed bridge includes a main girder, towers, and cables. The main girder comprises at least one girder segment, and each girder segment is equipped with at least one tower. The construction process includes: (1) With the tower as the center, the construction area of ​​the beam is defined along the main beam structure, and the construction area is divided into multiple construction segments. Each construction segment is constructed simultaneously on both sides of the beam length direction with the tower as the center and is equipped with a pair of inclined cables. (2) After some construction segments are constructed, a partial beam is formed. In the remaining construction segments, when the construction segment is a side span beam, the first end of the cable in at least one construction segment is connected to the partially formed beam and the second end is connected to the permanent reaction support point at the side pier to form a tie cable. When the construction segment is a mid-span beam, the first end of the cable in at least one construction segment is connected to the partially formed beam and the second end is connected to another beam adjacent to the partially formed beam to form a tie cable. The two ends of the tie cable are located on the same side of the tower. (3) The beam body is then joined together; (4) Disassemble the second end of the tie cable to the permanent reaction support point at the side pier or another section of the beam, and connect the second end to the tower of the beam where the first end is located; In the remaining construction segments, the construction segments for setting the stay cables and the construction segments for setting the counter-stayed cables are carried out alternately; Of the remaining construction segments, the last construction segment is equipped with the cable-stayed cable.

2. The construction method according to claim 1, characterized in that, In step (2), the remaining construction segments include m construction segments, m1 construction segments are equipped with inclined stay cables, and m2 construction segments are equipped with tie cables, m = m1 + m2, m, m1, and m2 are all independent positive integers, and m is not less than 2.

3. The construction method according to any one of claims 1 to 2, characterized in that, At least part of the tension cable is made of carbon fiber composite material.

4. The construction method according to claim 3, characterized in that, In the remaining construction segments, at least some of the stay cables are made of carbon fiber composite material.

5. The construction method according to claim 3, characterized in that, In step (2), a partial beam is formed after partial construction segments are constructed. In each of the partial construction segments, a stay cable is independently installed. Optionally, at least a portion of the stay cables in the construction segment are made of carbon fiber composite material.

6. The construction method according to claim 1 or 4, characterized in that, The cable-stayed bridge comprises multiple beam segments, which are joined together to form the main beam.

7. The construction method according to claim 1 or 4, characterized in that, Prior to step (1), the following are also included: foundation construction, pier and tower construction; and / or, It also includes: (5) dismantling the remaining temporary construction equipment and construction ancillary facilities.

8. A cable-stayed bridge, characterized in that, It is constructed using the method described in any one of claims 1 to 7.

9. The cable-stayed bridge according to claim 8, characterized in that, The cable-stayed bridge's towers are connected to carbon fiber composite cables.

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