A cable-stayed suspension bridge system

Abstract

The present invention discloses a cable-stayed suspension cooperative system bridge, which belongs to the field of bridge engineering technology. It includes a main beam and at least two bridge towers arranged along the extension direction of the main beam. The main beam is erected on the two bridge towers. The main beam includes a suspension area beam section and two diagonal area beam sections. The two diagonal area beam sections are respectively arranged on both sides of the suspension area beam section, and the two bridge towers are respectively arranged at the intersection of the suspension area beam section and the two diagonal area beam sections. In addition, a suspension cable is arranged between the two bridge towers. A plurality of hangers are arranged between the suspension cable and the suspension area beam section, and the plurality of hangers are arranged at an inclined angle to the main beam. The cable-stayed suspension cooperative system bridge in this application can effectively reduce the longitudinal displacement of the main beam under the action of live load, temperature load, wind load and braking force. At the same time, the mid-span suspension cable and the main beam use rigid hangers to lock the temperature zero point of the main beam, realize system temperature adaptation, release the temperature deformation of the main beam, and reduce the telescopic length of the main beam to both sides.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge engineering, and in particular relates to a cable-stayed suspension coordinated system bridge. Background Art

[0002] Cable-supported bridges are the main form of super-long span bridges at present. Cable-supported bridges are further divided into suspension bridges and cable-stayed bridges.

[0003] Among them, suspension bridges have large spans and high construction costs, but low overall stiffness. Under the action of vehicle loads and seismic loads, the stiffening beams and main cables will produce asynchronous longitudinal and lateral displacements, which can easily cause the cables to bend. In addition, suspension bridges have poor aerodynamic stability, especially in some special geological areas or complex marine environments, where the problem is more prominent.

[0004] Due to the limited inclination angle of the cable stays, the height-to-span ratio of the towers (the portion above the bridge deck) of cable-stayed bridges is generally between 1 / 6 and 1 / 4. As the span increases, the towers will become taller, which in turn brings stability issues and difficulties in tower construction. Furthermore, as the span increases, the length of the cables also increases, and the sag effect of the cables becomes more significant, which in turn increases the strength requirements of the cables and raises the technical requirements for cable production.

[0005] Under the influence of static and dynamic forces such as longitudinal wind load, temperature load, live load, and braking force, the existing cable-bearing system structure causes the longitudinal displacement of the beam ends of large-span cable-structured bridges to increase rapidly with the increase of span, becoming the main factor restricting the design of large-span bridges. Summary of the Invention

[0006] In response to one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides a cable-stayed suspension cooperative system bridge to solve the problem that the longitudinal displacement of the beam ends of existing cable-structured bridges increases with the increase of span.

[0007] To achieve the above-mentioned object, the present invention provides a cable-stayed suspension coordinated system bridge, comprising:

[0008] a main beam, and at least two bridge towers arranged along the extension direction of the main beam;

[0009] The main beam comprises a suspension area beam section and two inclined area beam sections, and the two inclined area beam sections are respectively arranged on both sides of the suspension area beam section;

[0010] A suspension cable is provided between the two bridge towers, and a plurality of hangers are provided between the suspension cable and the beam section of the suspension cable area. The plurality of hangers are arranged at an inclined angle to the extension direction of the main beam.

[0011] As a further improvement of the present invention, the booms are arranged in pairs, and the inclination directions of every two booms arranged in a pair are opposite.

[0012] As a further improvement of the present invention, a plurality of the hangers are arranged in a cross-net pattern between the suspension cables and the suspension cable area beam sections.

[0013] As a further improvement of the present invention, the two hangers arranged in pairs are connected to the same position of the suspension cable, the two hangers arranged in pairs are connected to different positions of the beam section in the suspension cable area, and the two hangers are arranged in a "Λ" shape.

[0014] As a further improvement of the present invention, the two suspension rods arranged in pairs are connected to the suspension cable via a cable clamp.

[0015] As a further improvement of the present invention, two adjacent hangers with opposite inclination directions are connected to the beam section of the suspension area through ear plates.

[0016] As a further improvement of the present invention, the distance between the two hangers arranged in pairs and connecting the two ends of the beam section in the suspension area is 36m.

[0017] As a further improvement of the present invention, the angle between the hanger and the beam section of the suspension area is 24° to 75°.

[0018] As a further improvement of the present invention, the suspension rods are symmetrically arranged on both sides of the lowest point of the suspension cable.

[0019] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0020] In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:

[0021] (1) The cable-stayed and suspension-type bridge of the present invention combines the advantages of both cable-stayed and suspension bridges. Compared with cable-stayed bridges, it eliminates the long cable in the mid-span section, thus reducing the height of the cable towers. Compared with suspension bridges, it eliminates the long suspension cables near the bridge towers, thus reducing the volume of the anchors and the cost. The spanning capacity of the bridge is further improved. In addition, due to the reduction in the height of the bridge towers and the substantial reduction in the cantilever construction length of the main beam of the cable-stayed section, the wind resistance stability of the structure during the cantilever construction process is improved, and the construction risk is reduced. At the same time, the present application sets a plurality of hangers between the suspension cables and the suspension section of the main beam, and sets the hangers in an inclined manner, so that when the main beam is extended or shortened to both sides under the action of temperature rise and fall loads, the hangers inclined against the main beam surface can provide a horizontal abutment force, thereby reducing the extension or shortening distance of the main beam. Compared with the traditional cable-stayed and suspension-cooperative system bridge, the cable-stayed and suspension-cooperative system bridge in the present invention has a main span vertical displacement reduced by about 14% under live load, a beam end longitudinal displacement reduced by 12% under wind load, and the use of hanger cable clamps and beam hanger pins reduced by 50%.

[0022] (2) The cable-stayed suspension cooperative system bridge of the present invention is characterized in that the paired hangers are arranged in a cross form or at a diagonal angle to each other, so that the paired hangers form a mutually supporting abutment structure between the cables and the main beam, which can effectively reduce the longitudinal displacement of the main beam under the action of live load, temperature load, wind load and braking force of the hanger cable-stayed suspension cooperative system. At the same time, the cables and the main beam in the middle of the span use rigid hangers to lock the temperature zero point of the main beam, thereby realizing temperature self-adaptation of the system, releasing the temperature deformation of the main beam, and reducing the telescopic length of the main beam to both sides. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 2. It is a schematic diagram of the overall structure of a cable-stayed suspension system bridge according to an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the overall structure of a bridge tower in an embodiment of the present invention;

[0025] Figure 3 Schematic diagram of the connection between the boom and the suspension cable in an embodiment of the present invention;

[0026] Figure 4 Schematic diagram of the connection between the boom and the main beam in an embodiment of the present invention.

[0027] In all the drawings, the same reference numerals represent the same technical features, specifically:

[0028] 1. Main beam; 2. Bridge tower; 3. Suspension cable; 4. Hanger rod; 5. Cable clamp; 6. Stay cable; 7. Lug plate;

[0029] 101. Beam section in cable-stayed area; 102. Beam section in cable-stayed area;

[0030] 201. Upper tower column; 202. Middle tower column; 203. Lower tower column; 204. First crossbeam; 205. Second crossbeam; 206. Support. DETAILED DESCRIPTION

[0031] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0032] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0033] Furthermore, 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 the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0034] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0036] Example:

[0037] See also Figures 1 to 4The cable-stayed and cable-stayed bridge system in a preferred embodiment of the present invention includes a main beam 1 and at least two bridge towers 2 disposed along the extension direction of the main beam 1. The main beam 1 is mounted on the two bridge towers 2. The main beam 1 includes a suspension section 101 and two cable-stayed sections 102, with the two cable-stayed sections 102 disposed on either side of the suspension section 101. Furthermore, a suspension cable 3 is disposed between the two bridge towers 1. Multiple hangers 4 are disposed between the suspension cable 3 and the suspension section 101. These hangers 4 are arranged at an angle to the extension direction of the main beam 1.

[0038] Specifically, the main beam 1 is arranged horizontally, and the two bridge towers 2 are vertically arranged in the extension direction of the main beam 1. The arrangement position of the bridge towers 2 divides the main beam 1 into two cable-stayed beam sections 102 and one suspension beam section 101, wherein the part of the main beam 1 located between the two bridge towers 2 is the suspension beam section 101, and the part of the main beam 1 where the two bridge towers 2 are facing away from each other is the cable-stayed beam section 102.

[0039] Furthermore, the main tower of the bridge tower 2 is a diamond-shaped reinforced concrete tower or steel bridge tower. The ratio of the tower height above the bridge deck to the span of the main beam 1 is approximately 1:6.5. The bridge tower 2 is divided into an upper tower column 201, a middle tower column 202, and a lower tower column 203. A first crossbeam 204 is provided between the upper tower column 201 and the middle tower column 202, and a second crossbeam 205 is provided between the middle tower column 202 and the lower tower column 203. The first crossbeam 204 and the second crossbeam 205 support the diamond-shaped structure and provide stability. A support 206 is provided below the lower tower column 203, and a foundation is provided below the support 206. The foundation depends on the geological conditions at the location of the coordinated suspension system of the suspenders and cable stays. Typically, a prefabricated foundation such as a pile foundation, a caisson foundation, or a caisson foundation can be used.

[0040] Furthermore, the main beam 1 in this application utilizes an integral steel box girder structure, with a total beam width of 54.9m and a beam height of 5m. The standard longitudinal spacing of the stay cable anchor points on the beam is 14m, and the main span aspect ratio is 1:12.18. The steel box girder structure utilizes orthotropic plates. Transverse diaphragms are installed every 3.5m. The lugs of the main beam 1 are pinned to the hanger rods 4 at the ends of the suspension cables 3, and the lugs are located on the straight web of the box girder.

[0041] Furthermore, stay cables 6 are installed on either side of the main beam 1 along its extension direction. One end of each stay cable 6 is connected to the tops of the two towers 2, and the other end is connected to the end of the main beam 1 facing away from the towers 2. Specifically, the stay cables 6 utilize hot-dip galvanized φ7 high-strength parallel steel wire cables with an fpk of 2000 MPa. Cable-beam anchorage can utilize structures such as anchor plates and steel anchor boxes, while tower anchorage can utilize steel anchor beams, steel anchor boxes, and prestressed tooth blocks.

[0042] Furthermore, the mid-span rise-to-span ratio of the cable 3 in this application is 1:6.5, and prefabricated parallel steel wire strands are used. The steel wire strength grade is 2000 MPa, and each strand is composed of 127 galvanized high-strength steel wires with a diameter of 5.25 mm. Each main cable is composed of 169 strands.

[0043] Furthermore, as a preferred embodiment of the present invention, the hangers 4 in the present application are arranged in pairs, and the inclination directions of each two pairs of hangers 4 are opposite. When the hangers 4 are arranged obliquely between the suspension cable 3 and the suspension zone beam section 101, the obliquely arranged hangers 4 can provide a horizontal abutment force and a vertical pulling force. In order to cope with the expansion and contraction of the main beam 1 to both sides, that is, the main beam 1 has a tendency to displace to both sides, the force provided to the main beam 1 by the hangers 4 should also extend to both sides. Based on this, the hangers 4 are arranged in pairs, and the inclination directions of each two pairs of hangers 4 are opposite, so that the two pairs of hangers 4 can respectively provide forces in opposite directions to the main beam 1 to respectively correspond to the expansion and contraction of the main beam 1 to both sides.

[0044] Furthermore, as an optional embodiment of the present invention, the plurality of hangers 4 in the present application are arranged in a cross-net pattern between the cables 3 and the suspension beam section 101. When the hangers 4 are used to provide lateral and vertical forces to the main beam 1, the hangers 4 can be arranged in a cross-net pattern to form an interlaced network structure between the cables 3 and the suspension beam section 101, thereby sharing the live load, temperature load, wind load, and braking force of the cable-stayed suspension bridge.

[0045] Furthermore, as an optional embodiment of the present invention, the two hangers 4 arranged in pairs are connected to the same position on the suspension cable 3, and the two hangers 4 are connected to different positions on the suspension beam section 101. The two hangers 4 are arranged in a "Λ" shape. Compared to the above-mentioned staggered grid arrangement of the hangers 4, the two hangers 4 arranged in a "Λ" shape form a stable triangular structure with the main beam 1, further improving the stability of the cable-stayed suspension bridge system.

[0046] As an optional form of the present invention, the two suspension rods 4 arranged in pairs in the present application can also be connected to different positions of the suspension cable 3 to form a relatively inclined "eight"-shaped structure.

[0047] Furthermore, the two paired hangers 4 are connected to the suspension cables 3 via cable clamps 5, while two adjacent hangers 4 with opposite inclinations are connected to the suspension beam section 101 via lugs. When securing the hangers 4 to the suspension cables 3, the two "Λ"-shaped hangers 4 are connected to the connecting ends of the suspension cables 3 via the cable clamps 5, while the two hangers 4 in the adjacent "Λ"-shaped structures are connected to the main beam 1 via lugs. Preferably, the lugs contain multiple spare pin holes for connecting the hangers 4, allowing for quick adjustment and replacement if the connection between the hangers 4 and the lugs becomes damaged or loose.

[0048] Specifically, the distance between the two paired hangers 4 connecting the ends of the cable-suspended beam section 101 is 36 meters. Of course, the distance between the two hangers 4 connecting the ends of the cable-suspended beam section 101 can also be 12 meters, 20 meters, or other distances. This distance can be adjusted based on the structural strength of the main beam. When the main beam is stronger, the span can be increased accordingly. That is, the distance between the two ends of the hangers 4 forming the "Λ"-shaped structure is 36 meters. Because the cables 3 suspended between the two pylons 2 are arranged in an arc shape under the action of gravity, the portion of the cables 3 near the beam center is the closest vertical distance to the main beam 1, while the portion of the cables 3 near the pylons 2 is the farthest vertical distance from the main beam 1. Since the ends of the hangers 4 are connected to the cables 3 and the main beam 1, respectively, the angle between the hangers 4 near the beam center and the main beam 1 is smaller, while the angle between the hangers 4 away from the beam center and the main beam 1 is larger. The angle between the hangers 4 and the main beam 1 is gradually changing. Preferably, the angle distribution range between the above-mentioned hanger rods 4 and the suspension beam section 101 is 24° to 75°. In addition, the suspension beam section 101 is arranged with 9 pairs of the above-mentioned hanger rods 4 in the shape of "Λ".

[0049] Furthermore, the above-mentioned hangers 4 are symmetrically arranged on both sides of the beam of the main beam 1, and the hangers 4 located in the beam are respectively fixed to the cables 3 and the main beam 1. When the above-mentioned hangers 4 are respectively fixed to the cables 3 and the main beam 1, they are preferably connected by steel sections. As one of the optional embodiments, the cables 3 in the present application are directly fixed to the main beam 1 in the beam. Regardless of whether the cables 3 are fixed to the main beam 1, or the cables 3 and the main beam 1 are fixed by the hangers 4, the beam of the main beam 1 forms a fixed constraint with the cables 3, and then the fixed constraint formed by the bridge tower 2 and the main beam 1, the cable-stayed cable cooperative system bridge in the present application forms a temperature-adaptive system, that is, when the main beam 1 is subjected to temperature rise and fall loads, the main beam 1 extends or shortens symmetrically to both sides with the mid-span as the origin, and the hangers 4 symmetrically arranged on both sides of the beam can correspondingly reduce the expansion and contraction amplitude of the main beam, thereby reducing the expansion and contraction amount of the main beam 1.

[0050] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A cable-stayed suspension bridge system, characterized in that: include: A main beam, and at least two bridge towers arranged along the extension direction of the main beam, wherein the main beam is erected on the two bridge towers; The main beam comprises a suspension area beam section and two inclined area beam sections, and the two inclined area beam sections are respectively arranged on both sides of the suspension area beam section; A suspension cable is provided between the two bridge towers, and a plurality of hangers are provided between the suspension cable and the beam section of the suspension cable area, and the plurality of hangers are arranged at an inclined angle to the extension direction of the main beam; The suspenders are arranged in pairs, the two suspenders in a pair are connected to the same position of the suspension cable, the two suspenders in a pair are connected to different positions of the beam section of the suspension cable area, and the two suspenders are arranged in an "ʌ" shape. The two suspenders in a pair are connected to the suspension cable via cable clamps, and two adjacent suspenders in opposite inclination directions are connected to the beam section of the suspension cable area via ear plates. The suspension rods are symmetrically arranged on both sides of the main beam.

2. The cable-stayed suspension bridge according to claim 1, characterized in that: A plurality of the suspension rods are arranged in a cross-net pattern between the suspension cables and the suspension cable area beam section.

3. The cable-stayed suspension bridge according to claim 1, characterized in that: The included angle between the hanger and the beam section of the suspension area is 24°~75°.

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