A y-type tower cable suspension bridge and a design method thereof

Abstract

The application discloses a Y-shaped tower cable-stayed bridge and a design method thereof, and relates to the field of bridge engineering. The Y-shaped tower cable-stayed bridge comprises a bridge main body and at least one group of tower column groups which are arranged at intervals along the longitudinal direction of the bridge. Each group of the tower column groups comprises two Y-shaped tower columns which are arranged at intervals along the transverse direction of the bridge. A plurality of stay cables are arranged on the tower limbs of the Y-shaped tower columns and connected with the bridge main body. The design method is used for designing the Y-shaped tower cable-stayed bridge. The second stay cable on the left tower limb is connected with the bridge main body by penetrating the right tower limb, and the first stay cable on the right tower limb is connected with the bridge main body by penetrating the left tower limb, so that the left tower limb and the right tower limb do not need to be arranged with transverse connections to balance the cable force, the construction process is more convenient, and the overall appearance is more simple and neat. The Y-shaped tower column can solve the height limitation of the tower column, increase the angle of the stay cable and reduce the cable force of a single cable.

Description

Technical Field

[0001] This invention relates to the field of bridge engineering technology, specifically to a Y-shaped tower-stayed bridge and its design method. Background Technology

[0002] With the rapid development of bridges, numerous bridges spanning rivers and canyons are being constructed frequently as an important part of road transportation. Currently, there are various structural forms for cable-stayed bridge towers both domestically and internationally. In the longitudinal direction, there are single-column, A-type, and inverted Y-type towers, while in the transverse direction, there are single-column, double-column, portal, H-type, A-type, gemstone-type, and inverted Y-type towers. For cable-stayed bridges, a flexible system, improving the overall structural stiffness is a key factor in bridge design, construction, and building.

[0003] For cable-stayed bridges with small to medium spans, the height of the bridge towers cannot reach the normal height during construction due to limitations in aviation clearance. This results in a smaller horizontal inclination angle of the stay cables and a larger cable tension. If a conventional Y-shaped tower design is adopted, a transverse connecting system needs to be added between the left and right inclined legs of the upper tower column to balance the cable tension, which not only increases the construction period but also increases construction costs. Summary of the Invention

[0004] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a Y-shaped tower-stayed bridge and its design method, so as to solve the problems of inconvenient construction and high cost of small-span, low-tower-stayed bridges in the existing technology.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] On one hand, this application provides a Y-shaped tower cable-stayed bridge, including a bridge body and at least one group of tower columns spaced apart along the longitudinal direction of the bridge. Each group of tower columns includes two Y-shaped tower columns spaced apart in the transverse direction of the bridge. The Y-shaped tower columns include:

[0007] The lower tower column is used to support the main body of the bridge.

[0008] The left and right towers are symmetrically connected to the top of the lower tower in the longitudinal direction. Both the left and right towers are equipped with multiple first stay cables extending towards the smaller mileage and second stay cables extending towards the larger mileage. Both the first and second stay cables are at a set angle to the main body of the bridge.

[0009] Specifically, the second stay cable on the left tower passes through the right tower and connects to the main body of the bridge, and the first stay cable on the right tower passes through the left tower and connects to the main body of the bridge.

[0010] In some alternative embodiments, the anchor points of the first and second stay cables on the left tower are staggered, and the anchor points of the first and second stay cables on the right tower are staggered.

[0011] In some alternative embodiments, the distance between the anchorage point of the first stay cable connected to the left tower and located on the outermost side of the bridge body and the anchorage point of the first stay cable connected to the right tower and located on the outermost side of the bridge body is equal to the distance between the top of the left tower and the top of the right tower.

[0012] On the other hand, this application also provides a design method for a Y-type tower cable-stayed bridge, used to design any of the above-mentioned Y-type tower cable-stayed bridges, comprising the following steps:

[0013] Based on the main beam span and inter-segment spacing of the bridge, determine the number of the first and second stay cables connected to the left and right towers respectively;

[0014] Based on the number of the first stay cables and the pitch, determine the distance between the top of the left tower and the top of the right tower.

[0015] The set angles between the first and second stay cables and the main body of the bridge are determined based on the distance between the top of the left and right towers.

[0016] In some optional embodiments, the number of first and second stay cables connected to the left and right towers respectively is determined based on the main girder span and inter-segment spacing of the bridge body, including:

[0017] Based on the main beam span and inter-segment spacing of the bridge, determine the total number n of the first and second stay cables on each tower.

[0018] Based on the total number n of the first and second stay cables on each tower segment, and considering that the difference between the number of the first and second stay cables is less than a set value, the number of the first and second stay cables on each tower segment is determined.

[0019] In some optional embodiments, the total number n of the first and second stay cables on each tower is determined based on the main girder span and inter-segment spacing of the bridge body, including:

[0020] The total number of first and second stay cables n is determined by n=L2 / L3, where L is the main beam span and L is the pitch.

[0021] According to n= 1. Determine the total number n1 of the first and second stay cables on each tower leg.

[0022] In some optional embodiments, the above setting is 2.

[0023] In some alternative embodiments, the distance between the tops of the two tower legs is determined based on the number of first stay cables and the inter-node spacing, including:

[0024] The distance L1 between the tops of the left and right tower legs is determined by L1 = n2 * L3, where n2 is the number of the first stay cables.

[0025] In some optional embodiments, determining the set angles between the first and second stay cables and the bridge body based on the distance between the tops of the left and right towers includes:

[0026] Based on the distance L1 between the top of the left tower and the top of the right tower, determine the spacing between the anchorage points of the first stay cable connected to the top of the left tower and the first stay cable connected to the top of the right tower on the main body of the bridge.

[0027] Based on the distance between the anchor points of the first stay cable connected to the top of the left tower and the first stay cable connected to the top of the right tower on the main body of the bridge, and combined with the height of the first stay cable connected to the top of the left tower from the bridge deck and the inter-segment spacing, the set angle between the first stay cable and the second stay cable and the main body of the bridge is determined.

[0028] In some optional embodiments, the set angle between the first and second stay cables and the bridge body is determined based on the distance between the anchorage points of the two first stay cables respectively connected to the top of the left and right towers on the bridge body, combined with the height of the first stay cable connected to the top of the left tower from the bridge deck and the pitch interval, including:

[0029] according to Determine the set angles between the first and second stay cables and the main body of the bridge. H2 is the height of the first cable-stayed cable at the top of the left tower above the main body of the bridge.

[0030] Compared with the prior art, the advantages of the present invention are as follows: by connecting the second stay cable on the left tower to the bridge body through the right tower and the first stay cable on the right tower to the bridge body through the left tower, there is no need to set up a lateral connection between the left and right towers to balance the cable force, and the construction process is simpler and the overall shape is more concise and neat; the Y-shaped tower can solve the tower height restriction problem while increasing the angle of the stay cable and reducing the cable force of a single cable. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the structure of a Y-shaped tower cable bridge according to the present invention;

[0033] Figure 2 for Figure 1 A schematic diagram showing the arrangement of the Y-shaped tower column and the first and second stay cables;

[0034] Figure 3 for Figure 1 Schematic diagram of AA section;

[0035] Figure 4 for Figure 1 Schematic diagram of the BB section;

[0036] Figure 5 for Figure 4 A magnified view of a portion of the letter "A" in the diagram;

[0037] Figure 6 for Figure 1 Schematic diagram of the BB section;

[0038] Figure 7 for Figure 6 A magnified view of the "B" in the middle.

[0039] In the diagram: 1. Y-shaped tower column; 11. Lower tower column; 12. Left tower leg; 13. Right tower leg; 2. First stay cable; 3. Second stay cable. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0042] On the one hand, such as Figure 1-7As shown, this application provides a Y-type tower cable-stayed bridge, including a bridge body and at least one group of tower columns arranged at intervals along the longitudinal direction of the bridge. Each group of tower columns includes two Y-type tower columns 1 arranged at intervals along the transverse direction of the bridge. Multiple cable stays connected to the bridge body are provided on the tower legs of the Y-type tower columns 1.

[0043] Specifically, the aforementioned Y-shaped tower column 1 includes a lower tower column 11 and a left tower limb 12 and a right tower limb 13 connected to the lower tower column 11 and located above the main bridge structure. The lower tower column 11 supports the main bridge structure; the left tower limb 12 and right tower limb 13 are symmetrically connected longitudinally to the top of the lower tower column 11 on both sides. Multiple first stay cables 2 extending towards a smaller mileage and second stay cables 3 extending towards a larger mileage are provided on both the left tower limb 12 and the right tower limb 13, and both the first stay cables 2 and the second stay cables 3 are at a predetermined angle to the main bridge structure. Specifically, the second stay cables 3 on the left tower limb 12 pass through the right tower limb 13 and connect to the main bridge structure, while the first stay cables 2 on the right tower limb 13 pass through the left tower limb 12 and connect to the main bridge structure.

[0044] Taking this embodiment as an example, two sets of tower columns are spaced apart along the longitudinal direction of the bridge. At this time, the tower column is located on one side of the side span at the smaller mileage and on the other side of the middle span at the larger mileage. The first stay cable 2 and the second stay cable 3 are located on both sides of the left tower 12 and the right tower 13 along the longitudinal direction of the bridge, respectively. Since the second stay cable 3 on the left tower 12 passes through the right tower 13 and connects to the main body of the bridge, and the first stay cable 2 on the right tower 13 passes through the left tower 12 and connects to the main body of the bridge, there is no need to set up a lateral connection between the left tower 12 and the right tower 13 to balance the cable force, and the construction process is simpler and the overall shape is more concise and neat. The Y-shaped tower column can solve the tower column height restriction problem while increasing the angle of the stay cable and reducing the cable force of a single cable.

[0045] In some alternative embodiments, as shown in the figure, the anchor points of the first stay cable 2 and the second stay cable 3 on the left tower limb 12 are staggered, and the anchor points of the first stay cable 2 and the second stay cable 3 on the right tower limb 13 are staggered.

[0046] It is understandable that the staggered anchorage of the stay cables on the tower limbs increases the tensioning space of the stay cables.

[0047] It should be noted that the arrangement of the first stay cable 2 and the second stay cable 3 on the left tower limb 12 and the first stay cable 2 and the second stay cable 3 on the right tower limb 13 is a mirror image of the lower tower column 11, thus ensuring the force balance of each stay cable. Simultaneously, the first stay cables 2 and the second stay cables 3 are numbered sequentially from the outside to the inside. For example, the first stay cable 2 and the second stay cable 3 closest to the top of the tower limb are both numbered 001, and the adjacent stay cable is numbered 002, with the numbering decreasing as the connection height between the stay cable and the tower limb decreases. The first stay cables 2 and the second stay cables 3 with the same number may have the same elevation, but regardless of whether the elevations are the same, the first stay cables 2 and the second stay cables 3 must be staggered in the horizontal direction.

[0048] In this example, the first stay cable 2 and the second stay cable 3, which are closest to the top of the tower, have the same elevation. Of course, considering structural strength, a certain anchorage distance needs to be reserved at the top of the tower.

[0049] In some alternative embodiments, the distance between the anchorage point of the first stay cable 2 connected to the left tower limb 12 and located on the outermost side of the bridge body and the anchorage point of the first stay cable 2 connected to the right tower limb 13 and located on the outermost side of the bridge body is equal to the distance between the top of the left tower limb 12 and the top of the right tower limb 13.

[0050] In other words, the line connecting the tops of the left tower limb 12 and the right tower limb 13, the two first stay cables 2 numbered 001, and the line connecting the two first stay cables 2 numbered 001 at the anchorage points of the main body of the bridge form a parallelogram, which can improve the stability of the bridge.

[0051] On the other hand, this application also provides a design method for a Y-type tower cable-stayed bridge, used to design any of the above-mentioned Y-type tower cable-stayed bridges, comprising the following steps:

[0052] S1: Based on the main beam span and inter-segment spacing of the bridge, determine the number of the first stay cable 2 and the second stay cable 3 connected to the left tower 12 and right tower 13 respectively.

[0053] In some optional embodiments, step S1 above includes:

[0054] S11: Determine the total number n1 of the first stay cable 2 and the second stay cable 3 on each tower leg based on the main span and inter-segment spacing of the bridge body.

[0055] Specifically, the total number of cables n for the first cable 2 and the second cable 3 is determined according to n=L2 / L3, where L2 is the main span of the bridge and L3 is the pitch.

[0056] Then according to n1= Determine the total number n1 of the first stay cable 2 and the second stay cable 3 on each tower leg.

[0057] S12: Based on the total number n of the first stay cable 2 and the second stay cable 3 on each tower segment, and considering that the difference between the number of the first stay cable 2 and the second stay cable 3 is less than a set value, determine the number of the first stay cable 2 and the second stay cable 3 on each tower segment.

[0058] It is understandable that, since the arrangement of the first stay cable 2 and the second stay cable 3 on the left tower limb 12 and the first stay cable 2 and the second stay cable 3 on the right tower limb 13 is symmetrical about the lower tower column 11, the number of first stay cables 2 and second stay cables 3 connected to each tower limb is the same.

[0059] In this example, the above setting value is 2, that is, the difference between the first stay cable 2 and the second stay cable 3 connected on each tower is less than 2. Based on this, the number of first stay cables 2 n2 and the number of second stay cables 3 on each tower are calculated.

[0060] S2: Based on the number of first stay cables 2 and the pitch, determine the distance between the top of the left tower leg 12 and the right tower leg 13.

[0061] In some alternative embodiments, the distance L1 between the tops of the left tower leg 12 and the right tower leg 13 is determined according to L1=n2*L3, where n2 is the number of the first stay cables 2.

[0062] S3: Determine the set angle between the first stay cable 2 and the second stay cable 3 and the main body of the bridge based on the distance between the top of the left tower limb 12 and the right tower limb 13.

[0063] In some optional embodiments, step S3 above includes:

[0064] S31: Based on the distance L1 between the top of the left tower limb 12 and the top of the right tower limb 13, determine the spacing between the anchor points of the first stay cable 2 connected to the top of the left tower limb 12 and the first stay cable 2 connected to the top of the right tower limb 13 on the main body of the bridge.

[0065] In other words, the distance L1 between the top of the left tower 12 and the right tower 13 is equal to the spacing between the anchor points of the first stay cable 2 connected to the top of each of the aforementioned towers on the main body of the bridge.

[0066] S32: Based on the distance between the anchor points of the first stay cable 2 connected to the top of the left tower limb 12 and the first stay cable 2 connected to the top of the right tower limb 13 on the main body of the bridge, and combined with the height of the first stay cable 2 connected to the top of the left tower limb 12 from the bridge deck and the inter-segment spacing, determine the set angle between the first stay cable 2 and the second stay cable 3 and the main body of the bridge.

[0067] In some alternative embodiments, according to Determine the set angle α between the first stay cable 2 and the second stay cable 3 and the main body of the bridge, where H2 is the height of the first stay cable 2 at the top of the left tower limb 12 from the bridge deck.

[0068] It should be noted that the height of the first stay cable 2 at the top of the left tower 12 from the bridge deck is the same as the height of the first stay cable 2 at the top of the right tower 13 from the bridge deck, and the elevations of the first stay cable 2 and the second stay cable 3 from the bridge deck are the same. Those skilled in the art can select appropriate elevations based on construction requirements and stress strength. In this example, the heights of the first stay cable 2 and the second stay cable 3 from the top of the left tower 12 and the right tower 13 can be 3.5~4m.

[0069] In some optional embodiments, after the number and planar position of the first stay cable 2 and the second stay cable 3 are initially determined, the cross-sectional dimensions of the tower limbs are determined by iterative calculation, combined with the longitudinal and transverse stiffness, strength and stability requirements of the Y-shaped tower column.

[0070] The present invention discloses a Y-shaped cable-stayed bridge and its design method. By connecting the second stay cable 3 on the left tower limb 12 through the right tower limb 13 to the main body of the bridge, and the first stay cable 2 on the right tower limb 13 through the left tower limb 12 to the main body of the bridge, the left tower limb 12 and the right tower limb 13 no longer need to be connected laterally to balance the cable force. The construction process is simpler and the overall shape is more concise and neat. The Y-shaped tower column can solve the tower column height restriction problem while increasing the angle of the stay cable and reducing the cable force of a single cable. The stay cables are staggered and anchored on the tower limbs, which increases the tensioning space of the stay cables.

[0071] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application 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 a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0072] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0073] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A design method for a Y-shaped tower cable-stayed bridge, characterized in that, For Y-type tower cable-stayed bridges, the Y-type tower cable-stayed bridge includes a bridge body and at least one group of tower columns spaced apart along the longitudinal direction of the bridge. Each group of tower columns includes two Y-type tower columns (1) spaced apart along the transverse direction of the bridge. The Y-type tower column (1) includes: Lower tower column (11), which is used to support the main body of the bridge; The left tower (12) and right tower (13) are symmetrically connected to the top of the lower tower (11) in the longitudinal direction. Both the left tower (12) and right tower (13) are provided with multiple first stay cables (2) extending to a small mileage and second stay cables (3) extending to a large mileage. The first stay cables (2) and the second stay cables (3) are both at a set angle to the main body of the bridge. The second stay cable (3) on the left tower (12) passes through the right tower (13) and connects to the main body of the bridge, and the first stay cable (2) on the right tower (13) passes through the left tower (12) and connects to the main body of the bridge. The design method includes the following steps: Based on the main beam span and inter-segment spacing of the bridge, determine the number of the first stay cable (2) and the second stay cable (3) connected to the left tower (12) and right tower (13) respectively; Based on the number of the first cable (2) and the pitch, determine the distance between the top of the left tower leg (12) and the right tower leg (13); The set angle between the first stay cable (2) and the second stay cable (3) and the main body of the bridge is determined based on the distance between the top of the left tower (12) and the right tower (13).

2. The design method according to claim 1, characterized in that, Based on the main beam span and inter-segment spacing of the bridge, determine the number of the first stay cable (2) and the second stay cable (3) connected to the left tower (12) and right tower (13) respectively, including: Based on the main beam span and inter-segment spacing of the bridge, determine the total number n1 of the first stay cable (2) and the second stay cable (3) on each tower leg; Based on the total number n1 of the first stay cable (2) and the second stay cable (3) on each tower leg, and considering that the difference between the number of the first stay cable (2) and the second stay cable (3) is less than a set value, the number of the first stay cable (2) and the second stay cable (3) on each tower leg are determined.

3. The design method according to claim 2, characterized in that, Based on the main beam span and inter-segment spacing of the bridge, determine the total number n1 of the first stay cable (2) and the second stay cable (3) on each tower, including: The total number of cables n for the first cable (2) and the second cable (3) is determined by n=L2 / L3, where L2 is the main beam span and L3 is the pitch. According to n1= Determine the total number n1 of the first stay cable (2) and the second stay cable (3) on each tower leg.

4. The design method according to claim 2, characterized in that, The set value is 2.

5. The design method according to claim 1, characterized in that, Based on the number of first stay cables (2) and the inter-joint spacing, the distance between the top of the left tower leg (12) and the top of the right tower leg (13) is determined, including: The distance L1 between the top of the left tower leg (12) and the right tower leg (13) is determined according to L1=n2*L3, where n2 is the number of the first cable (2).

6. The design method according to claim 5, characterized in that, Based on the distance between the tops of the left tower (12) and the right tower (13), the set angles between the first stay cable (2) and the second stay cable (3) and the main body of the bridge are determined, including: Based on the distance L1 between the top of the left tower (12) and the top of the right tower (13), determine the spacing between the anchor points of the first stay cable (2) connected to the top of the left tower (12) and the first stay cable (2) connected to the top of the right tower (13) on the main body of the bridge. Based on the distance between the anchor points of the first cable (2) connected to the top of the left tower (12) and the first cable (2) connected to the top of the right tower (13) on the main body of the bridge, and combined with the height of the first cable (2) connected to the top of the left tower (12) from the bridge deck and the inter-segment spacing, the set angle between the first cable (2) and the second cable (3) and the main body of the bridge is determined.

7. The design method according to claim 6, characterized in that, Based on the spacing between the anchorage points of the two first stay cables (2) connected to the top of the left tower (12) and the right tower (13) on the main body of the bridge, and combined with the height of the first stay cable (2) connected to the top of the left tower (12) from the bridge deck and the inter-segment spacing, the set angles between the first stay cable (2) and the second stay cable (3) and the main body of the bridge are determined, including: according to Determine the set angle between the first stay cable (2) and the second stay cable (3) and the main body of the bridge. H2 is the height of the first cable (2) at the top of the left tower (12) from the main body of the bridge.

8. The design method according to claim 1, characterized in that, The anchor points of the first stay cable (2) and the second stay cable (3) on the left tower leg (12) are staggered, and the anchor points of the first stay cable (2) and the second stay cable (3) on the right tower leg (13) are staggered.

9. The design method according to claim 1, characterized in that, The distance between the anchor point of the first cable (2) connected to the left tower (12) and located on the outermost side of the bridge body and the anchor point of the first cable (2) connected to the right tower (13) and located on the outermost side of the bridge body is equal to the distance between the top of the left tower (12) and the top of the right tower (13).

Images