Multi-joint coordinated deformation system of long-span bridge

Abstract

The application discloses a long-connection large-span bridge multi-joint coordinated deformation system and belongs to the technical field of bridge engineering, which is characterized by the following steps: a first beam joint is arranged between the main beam of a main bridge and the main beam of an approach bridge; a plurality of second beam joints are arranged in the main beam of the approach bridge; and a deformation coordination device is arranged in the first beam joint and the second beam joint, so that the main beam of the approach bridge is pulled by the deformation coordination device, the deformation of the first beam joint is dispersed into the deformation of the second beam joints, the change of the first beam joint is reduced, the displacement change of the main beam of the main bridge is reduced, and the structural stability of the main beam of the main bridge is improved. The application has the advantages of simple structure, ingenious design, effective dispersion of the large beam joint at the end of the main beam of the large-span bridge into small beam joints which are uniformly and synchronously opened and closed, effective reduction of the displacement change of the beam joint of the large-span bridge, avoidance of the arrangement of an additional beam end expansion device, improvement of the driving conditions at the beam end, guarantee of the stability and safety of high-speed train operation, and effective reduction of the engineering construction cost.

Description

Technical Field

[0001] This invention belongs to the field of bridge engineering technology, specifically relating to a multi-joint collaborative deformation system for long-span bridges. Background Technology

[0002] In the construction of long-span railway bridges, in order to ensure the reliable transition and support of the rails at the joints of the main and approach bridges, and to adapt to the displacement of the main and approach bridge ends under the influence of temperature and train live load, expansion joints are generally installed at the beam ends. As a special device at the beam end of long-span railway bridges, it should not only adapt to the spatial displacement such as horizontal and angular displacement at the beam joint, but also have good strength, stiffness and reliability to ensure the safety and stability of high-speed trains passing through this area.

[0003] Extensive research has been conducted both domestically and internationally on beam-end expansion joints, accumulating considerable experience in engineering applications. Based on long-term operational practice, for long-span bridges, the driving performance within the main span is generally excellent. However, due to variations in rail support stiffness within a small area and complex beam-end displacement in some bridges, the beam-end region becomes a critical area for controlling the driving performance of long-span bridges.

[0004] The beam-end expansion joint, installed to accommodate beam-end displacement, is essentially a complex mechanical device with high cost. It must meet comprehensive performance requirements for bridge operation and vehicle traffic, making it a prone-to-defect area for long-span bridges and a key area for routine bridge maintenance. Furthermore, as a mechanical structure, its dimensions are much smaller than the bridge structure, resulting in relatively weak stiffness, making it a weak point and control point for the driving performance of long-span bridges. The greater the beam joint variation that the device needs to accommodate, the more complex its mechanical components become, the weaker its stiffness, the greater the difficulty and cost of maintenance. Summary of the Invention

[0005] In response to one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides a multi-joint collaborative deformation system for long-span bridges, which can effectively reduce the deformation of the beam ends of long-span bridges and avoid the need to install beam end expansion joints.

[0006] To achieve the above objectives, the present invention provides a multi-joint coordinated deformation system for long-span bridges, which includes the main girder of the main bridge, the main girder of the approach bridge, and a deformation coordination device.

[0007] The approach bridge main beam and the main bridge main beam are longitudinally spaced apart, and a first beam joint is formed at the interval between them;

[0008] The approach bridge main beam is formed by a number of approach bridge main beam segments arranged longitudinally at intervals at one end of the main bridge main beam, and a second beam joint is formed between the approach bridge main beam segments. A bridge pier is provided below the first beam joint and the second beam joint.

[0009] The deformation coordination device is respectively provided in the first beam joint and the second beam joint. The deformation coordination device includes a main coordination rod, a first coordination link and a second coordination link.

[0010] The bottom of the coordinating main rod is rotatably connected to the bridge pier, forming a first connection point; one end of the first coordinating link is rotatably connected to the top of the coordinating main rod, forming a second connection point, and the other end is rotatably connected to the main girder segment of the main bridge or the approach bridge main girder segment near the main girder of the main bridge; one end of the second coordinating link is rotatably connected to the coordinating main rod between the first and second connection points, forming a third connection point, and the other end is rotatably connected to the approach bridge main girder segment on the corresponding side.

[0011] As a further improvement of the present invention, the height difference between the first connection point and the second connection point is L, and the height difference between the first connection point and the third connection point is L1. When the main girder of the main bridge displaces towards the main girder of the approach bridge, the following relationship exists:

[0012]

[0013] Where S is the displacement generated by the first coordinating link, and W is the displacement generated by the second coordinating link.

[0014] As a further improvement of the present invention, the position of the third connection point is adjustable along the extension direction of the coordinating main rod, so as to adjust the displacement change ratio of the first coordinating link and the second coordinating link by adjusting the position of the third connection point.

[0015] As a further improvement of the present invention, the ratio of the height difference L1 between the first connection point and the third connection point to the height difference L between the first connection point and the second connection point is in the range of 0.3 to 0.7.

[0016] As a further improvement of the present invention, the coordinating main rod is hinged to the pier via a first hinge assembly; the first hinge assembly includes a first hinge member, a pier fixing bolt, and a pier fixing steel plate;

[0017] One end of the first hinge is fixedly connected to the coordinating main rod, and the other end is fixedly connected to the pier fixing steel plate. The pier fixing steel plate is then fixedly connected to the pier by pier fixing bolts.

[0018] As a further improvement of the present invention, a sliding support is also provided between the pier and the first hinge assembly, and the pier fixing steel plate is slidably connected to the pier through the sliding support.

[0019] As a further improvement of the present invention, the first coordinating link is hinged to the main beam of the main bridge or the main beam segment of the approach bridge through the second hinge assembly, and the second coordinating link is hinged to the main beam segment of the approach bridge through the second hinge assembly.

[0020] The second hinge assembly includes a second hinge member, a beam end fixing bolt, and a beam end fixing steel plate. One end of the second hinge member is fixedly connected to the first or second coordinating link, and the other end is fixedly connected to the beam end fixing steel plate. The fixing steel plate is then fixed to the main beam of the main bridge or the main beam of the approach bridge by the beam end fixing bolt.

[0021] As a further improvement of the present invention, a limiting member is also provided corresponding to the first hinge assembly and / or the second hinge assembly to limit the maximum rotatable angle between the coordinating main rod, the first coordinating link and the second coordinating link.

[0022] As a further improvement of the present invention, the maximum rotatable angle is no greater than 30 degrees.

[0023] The aforementioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0024] In summary, the beneficial effects of the above-described technical solutions conceived by this invention compared with the prior art include:

[0025] (1) The multi-joint coordinated deformation system for long-span bridges of the present invention sets a first beam joint between the main beam of the main bridge and the main beam of the approach bridge, and sets several second beam joints in the main beam of the approach bridge. At the same time, a deformation coordination device is set in the first beam joint and the second beam joint. The deformation coordination device pulls the main beam of the approach bridge, and disperses part of the deformation of the first beam joint into the deformation of several second beam joints, thereby reducing the change of the first beam joint, thereby reducing the displacement change of the main beam of the main bridge and improving the structural stability of the main beam of the main bridge.

[0026] (2) The multi-joint collaborative deformation system for long-span bridges of the present invention has a simple structure and ingenious design. It can effectively disperse the large beam joints at the end of the main bridge of the long-span bridge into small beam joints that open and close uniformly and synchronously. This effectively reduces the displacement changes of the beam joints of the long-span bridge, avoids the need to set up additional beam end expansion devices, improves the driving conditions at the beam end, ensures the stability and safety of high-speed train operation, and effectively reduces the engineering construction cost. It has good application prospects and promotion value. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the multi-joint collaborative deformation system for long-span bridges in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the deformation coordination device in an embodiment of the present invention;

[0030] Figure 3 This is a schematic diagram illustrating the working principle of the deformation coordination device in an embodiment of the present invention;

[0031] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1. Main bridge girder; 2. Pier; 201. Pier connecting the main bridge and the approach bridge; 202. Approach bridge pier; 3. Deformation coordination device; 301. Coordination main rod; 302. First coordination link; 303. Second coordination link; 304. First hinge assembly; 3041. First hinge element; 3042. Pier fixing steel plate; 3043. Pier fixing bolt; 305. Second hinge assembly; 3051. Second hinge element; 3052. Beam end fixing steel plate; 3053. Beam end fixing bolt; 306. Third hinge assembly; 307. Fourth hinge assembly; 308. First connection point; 309. Second connection point; 310. Third connection point; 4. Approach bridge main girder; 401. Approach bridge main girder segment; 5. First beam joint; 6. Second beam joint; 7. Sliding support. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] 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 technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0035] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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.

[0036] 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 with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature 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.

[0037] Example:

[0038] Please see Figures 1-3 The multi-joint coordinated deformation system for long-span bridges in the preferred embodiment of the present invention includes the main bridge beam 1, the approach bridge main beam 4, and the deformation coordination device 3.

[0039] Specifically, such as Figure 1As shown, the main girder 1 of the main bridge is the main body of the long-span bridge structure. The approach bridge main girder 4 is located at the end of the main girder 1 and is longitudinally spaced from the main girder 1 to form a first beam joint 5 at the interval between the main girder 1 and the approach bridge main girder 4. At the same time, the end of the approach bridge main girder 4 near the main girder 1 is formed by several approach bridge main girder segments 401 arranged longitudinally at intervals, and a second beam joint 6 is formed between every two approach bridge main girder segments 401.

[0040] Accordingly, piers 2 are provided below the first beam joint 5 and the second beam joint 6, such as Figure 1 As shown, a main bridge pier 201 connecting the main bridge and the approach bridge is set below the first beam joint 5, and an approach bridge pier 202 is set below the second beam joint 6.

[0041] Meanwhile, deformation coordination devices 3 are respectively installed in the first beam joint 5 and the second beam joint 6, and the deformation coordination devices 3 are installed on the piers 2 below the first beam joint 5 and the second beam joint 6. When the main beam 1 of the main bridge deforms and moves, the deformation coordination devices 3 can pull the main beam 4 of the approach bridge to move in a certain proportion, thereby dispersing the deformation of the large-span bridge beam end to multiple approach bridge main beam segments 401. This will further disperse the deformation of the first beam joint 5 to the deformation of several second beam joints 6, thereby reducing the change of the first beam joint 5 and thus reducing the displacement change of the main beam 1 of the main bridge, avoiding the need for beam end expansion joints.

[0042] like Figure 2 As shown, the deformation coordination device 3 in the preferred embodiment includes a coordination main rod 301, a first coordination link 302, and a second coordination link 303. The coordination main rod 301 is arranged vertically, and its bottom is rotatably connected to the pier 2 to form a first connection point 308, so that the coordination main rod 301 can swing around the first connection point 308.

[0043] Preferably, the bottom end of the coordinating main rod 301 is hinged to the pier 2 via a first hinge assembly 304. The first hinge assembly 304 includes a first hinge member 3041, a pier fixing steel plate 3042, and a pier fixing bolt 3043. The bottom end of the coordinating main rod 301 is first hinged to the pier fixing steel plate 3042 via the first hinge member 3041, and several fixing holes are provided on the pier fixing steel plate 3042 so as to fix the pier fixing steel plate 3042 to the pier 2 via the pier fixing bolt 3043, thereby hinged the bottom end of the coordinating main rod 301 to the pier 2.

[0044] Preferably, a sliding support 7 is also provided between the pier 2 and the first hinge assembly 304 to realize the horizontal sliding function of the simply supported beam of the approach bridge.

[0045] Furthermore, one end of the first coordinating link 302 is rotatably connected to the top of the coordinating main link 301 to form a second connection point 309. In a preferred embodiment, the first coordinating link 302 is hinged to the coordinating main link 301 through a third hinge assembly 306. When the deformation coordinating device 3 is installed in the first beam joint 5, the end of the first coordinating link 302 away from the coordinating main link 301 is rotatably connected to the end face of the main beam 1 of the main bridge. Correspondingly, when the deformation coordinating device 3 is installed in the second beam joint 6, the end of the first coordinating link 302 away from the coordinating main link 301 is rotatably connected to the approach bridge main beam section 401 on the side close to the main beam 1 of the main bridge.

[0046] Furthermore, one end of the second coordinating link 303 is rotatably connected to the coordinating main link 301 between the first connection point 308 and the second connection point 309, forming a third connection point 310. In a preferred embodiment, the second coordinating link 303 is hinged to the coordinating main link 301 through the fourth hinge assembly 307. When the deformation coordinating device 3 is installed in the first beam joint 5, the end of the second coordinating link 303 away from the coordinating main link 301 is rotatably connected to the end face of the approach bridge main beam 4 near the main bridge main beam 1. Correspondingly, when the deformation coordinating device 3 is installed in the second beam joint 6, the end of the second coordinating link 303 away from the coordinating main link 301 is rotatably connected to the approach bridge main beam section 401 on the side away from the main bridge main beam 1.

[0047] Preferably, the first coordinating link 302 is hinged to the main beam 1 of the main bridge or the main beam section 401 of the approach bridge via the second hinge assembly 305, and the second coordinating link 303 is hinged to the main beam section 401 of the approach bridge via the second hinge assembly 305. Specifically, the second hinge assembly 305 includes a second hinge member 3051, a beam end fixing steel plate 3052, and a beam end fixing bolt 3053. One end of the second hinge member 3051 is fixedly connected to the first coordinating link 302 or the second coordinating link 303, and the other end is fixedly connected to the beam end fixing steel plate 3052. A plurality of fixing holes are provided on the beam end fixing steel plate 3052 so as to fix the beam end fixing steel plate 3052 to the main beam 1 of the main bridge or the main beam section 401 of the approach bridge via the beam end fixing bolt 3053.

[0048] Preferably, limiting members are also provided corresponding to the first hinge assembly 304 and / or the second hinge assembly 305 to limit the maximum rotatable angle between the coordinating main rod 301, the first coordinating link 302, and the second coordinating link 303, so as to avoid the rotation angle being too large and affecting the overall stability of the cooperative deformation system. More preferably, the maximum rotatable angle does not exceed 30 degrees.

[0049] Taking the deformation coordination device 3 in the first beam joint 5 as an example, its working principle is as follows: when the main beam 1 of the main bridge is subjected to force and undergoes displacement along the longitudinal direction, it is transmitted to the coordination main rod 301 through the first coordination link 302. The top of the coordination main rod 301 is subjected to force and swings towards the approach bridge main beam 4. The second coordination link 303 is pushed by the coordination main rod 301 to pull the approach bridge main beam 4 to displace, converting part of the displacement of the main beam 1 of the main bridge into the displacement of the approach bridge main beam 4, thereby dispersing part of the deformation of the first beam joint 5 into several second beam joints 6, effectively reducing the displacement change of the main beam 1 of the main bridge and improving the stability of the main beam 1 of the main bridge.

[0050] like Figure 3 As shown, the height difference between the first connection point 308 and the second connection point 309 is set as L, and the height difference between the first connection point 308 and the third connection point 310 is set as L1. When the top of the main coordinating rod 301 swings, if the second connection point 309 displaces by S, that is, the main girder 1 of the main bridge displaces by S, then the third connection point 310, that is, the approach bridge main girder 4, will displace by W proportionally, and the relationship between W and S is:

[0051]

[0052] Preferably, the position of the third connection point 310 on the coordinating main rod 301 is set to be adjustable along the extension direction of the coordinating main rod 301, so as to adjust the ratio of L and L1 by adjusting the position of the third connection point 310, and then adjust the ratio of S and W according to the actual application requirements.

[0053] Preferably, the ratio of L1 to L is controlled within the range of 0.3 to 0.7 to ensure the stability and reliability of the deformation coordination device 3.

[0054] The multi-joint collaborative deformation system for long-span bridges in this invention has a simple structure and ingenious design. It can effectively disperse the large beam joints at the main bridge end of a long-span bridge into small beam joints that open and close uniformly and synchronously. This effectively reduces the displacement changes of the beam joints in the long-span bridge, avoids the need for additional beam end expansion joints, improves the driving conditions at the beam end, ensures the stability and safety of high-speed train operation, and effectively reduces the engineering construction cost. It has good application prospects and promotion value.

[0055] Those skilled in the art will readily understand 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 within the scope of protection of the present invention.

Claims

1. A long-span bridge multi-segment coordinated deformation system, characterized in that, This includes the main girder of the main bridge, the main girder of the approach bridge, and the deformation coordination device; The approach bridge main beam and the main bridge main beam are longitudinally spaced apart, and a first beam joint is formed at the interval between them; The approach bridge main beam is formed by a number of approach bridge main beam segments arranged longitudinally at intervals at one end of the main bridge main beam, and a second beam joint is formed between the approach bridge main beam segments. A bridge pier is provided below the first beam joint and the second beam joint. The deformation coordination device is respectively provided in the first beam joint and the second beam joint. The deformation coordination device includes a main coordination rod, a first coordination link and a second coordination link. The bottom of the coordinating main rod is rotatably connected to the bridge pier, forming a first connection point; one end of the first coordinating link is rotatably connected to the top of the coordinating main rod, forming a second connection point, and the other end is rotatably connected to the main girder segment of the main bridge or the approach bridge main girder segment near the main girder of the main bridge; one end of the second coordinating link is rotatably connected to the coordinating main rod between the first and second connection points, forming a third connection point, and the other end is rotatably connected to the approach bridge main girder segment on the corresponding side; the maximum rotatable angle between the coordinating main rod, the first coordinating link, and the second coordinating link is no greater than 30 degrees. The height difference between the first connection point and the second connection point is L, and the height difference between the first connection point and the third connection point is L1. When the main girder of the main bridge displaces towards the main girder of the approach bridge, the following relationship exists: Where S is the displacement generated by the first coordinating link, and W is the displacement generated by the second coordinating link.

2. The long-associative long-span bridge multi-slit cooperative deformation system according to claim 1, characterized in that, The position of the third connection point is adjustable along the extension direction of the coordinating main rod, so as to adjust the displacement change ratio of the first coordinating link and the second coordinating link by adjusting the position of the third connection point.

3. The long-associative long-span bridge multi-slit cooperative deformation system according to claim 1, characterized in that, The ratio of the height difference L1 between the first connection point and the third connection point to the height difference L between the first connection point and the second connection point is in the range of 0.3 to 0.

7.

4. The long-associative long-span bridge multi-slit cooperative deformation system according to any one of claims 1-3, characterized in that, The main coordinating member is hinged to the pier via a first hinge assembly; the first hinge assembly includes a first hinge element, a pier fixing bolt, and a pier fixing steel plate. One end of the first hinge is fixedly connected to the coordinating main rod, and the other end is fixedly connected to the pier fixing steel plate. The pier fixing steel plate is then fixedly connected to the pier by pier fixing bolts.

5. The multi-joint collaborative deformation system for long-span bridges according to claim 4, characterized in that, A sliding support is also provided between the pier and the first hinge assembly, and the pier fixing steel plate is slidably connected to the pier through the sliding support.

6. The multi-joint collaborative deformation system for long-span bridges according to claim 5, characterized in that, The first coordinating link is hinged to the main girder of the main bridge or the main girder segment of the approach bridge via a second hinge assembly, and the second coordinating link is hinged to the main girder segment of the approach bridge via a second hinge assembly; The second hinge assembly includes a second hinge member, a beam end fixing bolt, and a beam end fixing steel plate. One end of the second hinge member is fixedly connected to the first or second coordinating link, and the other end is fixedly connected to the beam end fixing steel plate. The fixing steel plate is then fixed to the main beam of the main bridge or the main beam of the approach bridge by the beam end fixing bolt.

7. The multi-joint collaborative deformation system for long-span bridges according to claim 6, characterized in that, Limiting elements are also provided for the first hinge assembly and / or the second hinge assembly to limit the maximum rotatable angle between the coordinating main rod, the first coordinating link and the second coordinating link.

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