A cross double main cable multi-tower anchored suspension bridge

Abstract

The present invention relates to the technical field of cable-stayed suspension bridges, and provides a cross-double main cable multi-tower earth-anchored suspension bridge, which includes at least two first pylons arranged along the longitudinal direction of the bridge, and a second pylon is evenly arranged between each adjacent pair of the first pylons. The tops of two adjacent first pylons are connected by a first main cable, and the bottom of the first main cable is connected to the second pylon between these two first pylons. The tops of two adjacent second pylons are connected by a second main cable, and the bottom of the second main cable is connected to the first pylon between these two second pylons. Moreover, in the array of the first pylons, the first pylon at the end is connected to the anchor at the corresponding end through the first main cable. In the array of the second pylons, the second pylon at the end is connected to the anchor at the corresponding end through the second main cable. By providing the first main cable and the second main cable, which are cross-arranged, the present invention solves the technical problem of the weak longitudinal stiffness of the middle pylon in the prior art of multi-tower suspension bridges.

Description

Technical Field

[0001] The present invention relates to the technical field of suspension bridges with anchored cables, and particularly to a cross-double main cable multi-tower suspension bridge with anchored cables on the ground. Background Art

[0002] The suspension bridge is one of the commonly used bridge types. According to the anchoring form of the main cable, it is mainly divided into a self-anchored suspension bridge and an anchored suspension bridge on the ground. The anchored suspension bridge on the ground consists of a main cable, a cable tower, a stiffening girder, an anchor block, and a suspender. The two ends of the main cable are anchored on the anchor block. The vertical load is transmitted from the stiffening girder to the main cable through the suspender, and then from the main cable to the cable tower. The horizontal tension generated by the main cable is directly transmitted to the foundation through the anchor block. This bridge type forms a force system composed of the main cable, the bridge tower, and the anchor block, making full use of the tensile performance of the main cable and the compressive performance of the cable tower, and having a strong spanning ability. However, for a multi-tower (more than two) anchored suspension bridge on the ground, there is a technical problem that the longitudinal restraint of the middle cable tower on the main cable in the longitudinal direction of the bridge is weak, resulting in a small vertical stiffness of the system. This has become a bottleneck in the development of long-span multi-tower anchored suspension bridges on the ground, especially restricting their application in railway bridges. Currently, by appropriately increasing the longitudinal stiffness of the middle cable tower to improve the restraint on the main cable, such as making it in a "human" shape, an "A" shape, etc., there are two deficiencies: (1) It increases the engineering quantity of the tower body and the foundation, with poor economy, and for a multi-tower suspension bridge with a span of thousands of meters, the effect of improving the vertical stiffness of the system by increasing the longitudinal stiffness of the middle cable tower is not obvious or the cost is high; (2) If the longitudinal stiffness of the middle cable tower is too large, under the unbalanced load distribution between adjacent two spans, once the axial force difference of the main cable on both sides of the cable tower exceeds the anti-slip ability, it will bring a safety risk of the main cable slipping with the top of the tower. Summary of the Invention

[0003] The purpose of the present invention is to provide a cross-double main cable multi-tower suspension bridge with anchored cables on the ground. By providing a first main cable and a second main cable, which are cross-set, the technical problem of the weak longitudinal stiffness of the middle cable tower in the prior art of multi-tower suspension bridges is solved. It has the advantages of clear principle, simple structure, remarkable effect, convenient construction, outstanding economic and social benefits, etc.

[0004] To achieve the above purpose, the embodiments of the present invention provide the following technical solution: A cross-double main cable multi-tower suspension bridge with anchored cables on the ground includes at least two first cable towers arranged along the longitudinal direction of the bridge, and a second cable tower is evenly arranged between each group of adjacent two first cable towers. The adjacent two first cable towers are connected at the top by a first main cable, and the bottom of the first main cable is connected to the second cable tower between these two first cable towers. The adjacent two second cable towers are connected at the top by a second main cable, and the bottom of the second main cable is connected to the first cable tower between these two second cable towers. And in the array of the first cable towers, the first cable tower at the end is connected to the anchor block at the corresponding end through the first main cable. In the array of the second cable towers, the second cable tower at the end is connected to the anchor block at the corresponding end through the second main cable.

[0005] Furthermore, each of the first pylons and each of the second pylons includes a tower column and a lower saddle bracket provided near the bottom of the tower column close to the bridge deck. The first main cables between the first pylons and the second main cables between the second pylons are both in a suspended shape. The bottom of the suspended line of the first main cable is installed on the lower saddle bracket of the second pylon between two adjacent first pylons, and the bottom of the suspended line of the second main cable is installed on the lower saddle bracket of the first pylon between two adjacent second pylons.

[0006] Furthermore, each of the first pylons and each of the second pylons further includes a tower top saddle provided at the top of the tower column. The top of the first main cable is installed on the tower top saddle of the first pylon, and the top of the second main cable is installed on the tower top saddle of the second pylon.

[0007] Furthermore, when the total number of the first pylons and the second pylons is odd, in the array of the first pylons, the connection line between the first pylon at the end and the corresponding anchor is a suspended line, and in the array of the second pylons, the connection line between the second pylon at the end and the corresponding anchor is a horizontal line.

[0008] Furthermore, when the total number of the first pylons and the second pylons is even, in the array of the first pylons, the connection line between the first pylon at one end and the corresponding anchor is a suspended line, and the connection line between the first pylon at the other end and the corresponding anchor is a horizontal line. In the array of the second pylons, the connection line between the second pylon at one end and the corresponding anchor is a suspended line, and the connection line between the second pylon at the other end and the corresponding anchor is a horizontal line.

[0009] Furthermore, it further includes a first hanger for connecting the first main cable and the bridge deck and a second hanger for connecting the second main cable and the bridge deck.

[0010] Furthermore, it further includes a stiffening girder provided on the bridge deck.

[0011] Furthermore, the stiffening girder is provided between the first pylon and the second pylon.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: A cross-double main cable multi-tower earth-anchored suspension bridge, by providing a first main cable and a second main cable which are cross-arranged, solves the technical problem of weak longitudinal stiffness of the middle pylon in the prior art of multi-tower suspension bridges, and has the advantages of clear principle, simple structure, remarkable effect, convenient construction, prominent economic and social benefits, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1Schematic diagram of a multi-tower earth-anchored suspension bridge in the prior art;

[0014] Figure 2 Schematic diagram of the formation of a cross double main cable multi-tower earth-anchored suspension bridge provided by an embodiment of the present invention;

[0015] Figure 3 Schematic diagram when the sum of the numbers of the first tower and the second tower of a cross double main cable multi-tower earth-anchored suspension bridge provided by an embodiment of the present invention is odd;

[0016] Figure 4 Schematic diagram when the sum of the numbers of the first tower and the second tower of a cross double main cable multi-tower earth-anchored suspension bridge provided by an embodiment of the present invention is even;

[0017] Figure 5 For Figure 3 、 Figure 4 Schematic diagrams of the A-A section and the G-G section in

[0018] Figure 6 For Figure 3 、 Figure 4 Schematic diagrams of the D-D section and the E-E section in

[0019] Figure 7 For Figure 3 、 Figure 4 Schematic diagrams of the B-B section and the C-C section in

[0020] Figure 8 For Figure 4 Schematic diagrams of the F-F section and the H-H section in

[0021] In the reference numerals: 1 - the first tower; 2 - the second tower; 3 - the first main cable; 4 - the second main cable; 5 - the anchor; 60 - the lower saddle bracket; 70 - the vertical suspension line; 71 - the horizontal line; 80 - the first suspender; 81 - the second suspender; 9 - the stiffening girder. Detailed implementation manners

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to Figures 2 to 8, an embodiment of the present invention provides a cross-double main cable multi-tower anchored suspension bridge, which includes at least two first pylons 1 arranged along the longitudinal direction of the bridge, and a second pylon 2 is evenly arranged between each group of adjacent two of the first pylons 1. Adjacent two of the first pylons 1 are connected at the top by a first main cable 3, and the bottom of the first main cable 3 is connected to the second pylon 2 between these two first pylons 1. Adjacent two of the second pylons 2 are connected at the top by a second main cable 4, and the bottom of the second main cable 4 is connected to the first pylon 1 between these two second pylons 2. And in the array of the first pylons 1, the first pylon 1 at the end is connected to the anchor 5 at the corresponding end through the first main cable 3. In the array of the second pylons 2, the second pylon 2 at the end is connected to the anchor 5 at the corresponding end through the second main cable 4. In the prior art, as Figure 1 shown, it includes side pylons a, middle pylon b, main cable c, suspenders d, stiffening girder 9 and anchor 5. This form of main cable a is very likely to cause the problems of weak longitudinal stiffness of the middle pylon b and low vertical stiffness of the structure. Therefore, the method of using double main cables in this embodiment can well solve this defect. Specifically, in this embodiment, the pylons should actually be divided into side pylons and middle pylons. The pylon at the outermost edge is the side pylon, and the pylon between the two side pylons at both ends is the middle pylon. What this embodiment considers is the form of multi-towers, that is, there are at least two side pylons and one middle pylon. For the convenience of clear description, these pylons are sequentially defined as the first pylon 1, the second pylon 2, the first pylon 1, the second pylon 2... along the longitudinal direction of the bridge. Then, adjacent two of the first pylons 1 are connected by the first main cable 3, and adjacent two of the second pylons 2 are connected by the second main cable 4. Then naturally the first main cable 3 and the second main cable 4 are arranged in a cross pattern. Moreover, after the first main cable 3 and the second main cable 4 are connected, both ends of the first main cable 3 and both ends of the second main cable 4 are connected. Then, the low point where the first main cable 3 sags is connected to the second pylon 2 between these two adjacent first pylons 1, and at the same time, the low point where the second main cable 4 sags is connected to the first pylon 1 between these two adjacent second pylons 2, so that the longitudinal stiffness becomes stronger, thereby solving the defect in the prior art. The overall structure changes little and is relatively simple compared with the traditional structure, but it can obtain great economic and social benefits.

[0024] As an optimized solution of the embodiment of the present invention, please refer to Figures 2 to 8, each of the first pylons 1 and each of the second pylons 2 includes a tower column and a lower saddle bracket 60 provided at the bottom of the tower column near the bridge deck. The first main cables 3 between the first pylons and the second main cables 4 between the second pylons are both in a suspended shape. The bottom of the suspended line of the first main cable 3 is installed on the lower saddle bracket 60 of the second pylon 2 between two adjacent first pylons 1, and the bottom of the suspended line of the second main cable 4 is installed on the lower saddle bracket 60 of the first pylon 1 between two adjacent second pylons 2. In this embodiment, after the first main cable 3 and the second main cable 4 are installed, they are in a suspended shape. For the convenience of clear description, the two ends of this suspended shape are defined as the top of the suspended line, and the sunken end is defined as the bottom of the suspended line (i.e., the above-mentioned third point). In this embodiment, the connection of the bottom of the suspended line is anchored by the lower saddle bracket 60 at the bottom of the tower column, and in this way, the connection can be made more reliable. Of course, in addition to using the lower saddle bracket 60 for connection, other existing methods can also be used, which will not be elaborated here.

[0025] For further optimization of the above solution, please refer to Figures 2 to 8 , each of the first pylons 1 and each of the second pylons 2 further includes a top saddle provided at the top of the tower column. The two tops of the first main cable 3 are installed on the top saddles of the two first pylons 1, and the two tops of the second main cable 4 are installed on the top saddles of the two second pylons 2. In this embodiment, the above two tops (i.e., the top of the suspended line) are installed on the top saddle, and in this way, the connection can also be made more reliable.

[0026] As an optimized solution of the embodiment of the present invention, please refer to Figure 3 , when the total number of the first pylons 1 and the second pylons 2 is odd, in the array of the first pylons 1, the connection line between the first pylon 1 at the end and the corresponding anchor 5 is the suspended line 70, and in the array of the second pylons 2, the connection line between the second pylon 2 at the end and the corresponding anchor 5 is the horizontal line 71 (a part of the connection line). In this embodiment, for example Figure 3 in the case of the three pylons shown, that is, the case where the number is odd. For the convenience of clear description, we take out the first pylon 1 alone for explanation. If it is Figure 3 in this case, the two first pylons 1 are located at the left and right ends, and the connection lines between the two first pylons 1 and the two anchors 5 are both suspended lines 70. Then, we take out the second pylon 2 alone for explanation. For example, when there are five pylons, there are two second pylons 2 at this time, and the connection lines between these two second pylons 2 and the two anchors 5 are both horizontal lines 71 (a part of the connection line). Arranging the main cables in this way can make the structure more stable.

[0027] As an optimized solution of the embodiment of the present invention, please refer to Figure 4, when the total number of the first pylons 1 and the second pylons 2 is an even number, in the array of the first pylons 1, the connection line between the first pylon 1 at one end and the corresponding anchor 5 is a plumb line 70, and the connection line between the first pylon 1 at the other end and the corresponding anchor 5 is a horizontal line 71 (a part of the connection line). In the array of the second pylons 2, the connection line between the second pylon 2 at one end and the corresponding anchor 5 is a plumb line 70, and the connection line between the second pylon 2 at the other end and the corresponding anchor 5 is a horizontal line 71 (a part of the connection line). In this embodiment, for example Figure 4 in the case of the four pylons shown, that is, when the number is even, for the sake of clear description, we take out the first pylon 1 alone for illustration. At this time, there are two first pylons 1 in total. From Figure 4 left to right, the connection line between the first first pylon 1 and the Figure 4 left anchor 5 in is a plumb line 70, and the connection line between the second first pylon 1 and the Figure 4 right anchor 5 in is a horizontal line 71 (a part of the connection line). In the array of the second pylons 2, there are also two second pylons 2 at this time, and the situation is reversed compared with that of the first pylon 1. From left to right, the connection line between the first second pylon 2 and the left anchor 5 is horizontal (a part of the connection line), and the connection line between the second second pylon 2 and the right anchor 5 is a plumb line 70. The purpose of such design is also to make the structure more stable. The number of pylons can be more, but the connection forms of the main cables are within the above-mentioned situations of odd and even numbers of pylons.

[0028] As an optimized solution of the embodiment of the present invention, please refer to Figure 2 、 Figure 3 and Figure 4 , this suspension bridge further includes a first hanger 80 for connecting the first main cable 3 and the bridge deck and a second hanger 81 for connecting the second main cable 4 and the bridge deck. In this embodiment, the hanger plays a connecting role and is an existing design, so it will not be elaborated here.

[0029] As an optimized solution of the embodiment of the present invention, please refer to Figure 2 、 Figure 3 and Figure 4 , this suspension bridge includes a stiffening girder 9 provided on the bridge deck. In this embodiment, the stiffening girder 9 is for improving the stability. Preferably, the stiffening girder 9 is provided between the first pylon 1 and the second pylon 2. That is, the stiffening girder 9 is provided between every two pylons, making the structure of the suspension bridge more stable.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cross double main cable multi-tower anchored suspension bridge, comprising at least two first pylons arranged along the bridge axis, and a second pylon is evenly arranged between each adjacent pair of the first pylons, characterized in that: Two adjacent first pylons are connected by the top of a first main cable, and the bottom of the first main cable is connected to a second pylon between the two first pylons. Two adjacent second pylons are connected by the top of a second main cable, and the bottom of the second main cable is connected to a first pylon between the two second pylons. Moreover, in the array of the first pylons, the first pylon at the end is connected to the anchor at the corresponding end through the first main cable. In the array of the second pylons, the second pylon at the end is connected to the anchor at the corresponding end through the second main cable.

2. The cross double main cables multi-tower ground-anchored suspension bridge according to claim 1, wherein: Each of the first pylons and each of the second pylons includes a tower column and a lower saddle bracket provided near the bottom of the tower column close to the bridge deck. The first main cable between the first pylons and the second main cable between the second pylons are both in a catenary shape. The bottom of the catenary line of the first main cable is installed on the lower saddle bracket of the second pylon between two adjacent first pylons. The bottom of the catenary line of the second main cable is installed on the lower saddle bracket of the first pylon between two adjacent second pylons.

3. The cross double main cables multi-tower ground-anchored suspension bridge according to claim 2, wherein: Each of the first pylons and each of the second pylons further includes a tower top saddle provided at the top of the tower column. The top of the first main cable is installed on the tower top saddle of the first pylon. The top of the second main cable is installed on the tower top saddle of the second pylon.

4. The cross double main cables multi-tower earth-anchored suspension bridge according to claim 1, characterized in that: When the total number of the first pylons and the second pylons is odd, in the array of the first pylons, the connection line between the first pylon at the end and the corresponding anchor is a catenary line. In the array of the second pylons, the connection line between the second pylon at the end and the corresponding anchor is a horizontal line.

5. The cross double main cables multi-tower earth-anchored suspension bridge according to claim 1, wherein: When the total number of the first pylons and the second pylons is even, in the array of the first pylons, the connection line between the first pylon at one end and the corresponding anchor is a catenary line, and the connection line between the first pylon at the other end and the corresponding anchor is a horizontal line. In the array of the second pylons, the connection line between the second pylon at one end and the corresponding anchor is a catenary line, and the connection line between the second pylon at the other end and the corresponding anchor is a horizontal line.

6. The cross double main cables multi-tower earth-anchored suspension bridge according to claim 1, wherein: It further includes a first suspender for connecting the first main cable and the bridge deck and a second suspender for connecting the second main cable and the bridge deck.

7. The cross double main cables multi-tower ground-anchored suspension bridge according to claim 1, wherein: It further includes a stiffening girder provided on the bridge deck.

8. The cross double main cable multi-tower earth-anchored suspension bridge according to claim 7, wherein: The stiffening girder is provided between the first pylons and the second pylons.

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