Damping device, rigid frame bridge and rigid frame bridge damping method

Abstract

The invention discloses a damping device, a rigid frame bridge and a damping method of the rigid frame bridge, and relates to the technical field of bridge damping. The damping device comprises a mass block, a connecting arm, a damping element, an inerter and a spring; the mass block is movably arranged in a box girder in the bridge direction, the top of the connecting arm is fixedly connected with a top plate of the box girder, the bottom of the connecting arm extends downwards, the mass block is located on one side of the connecting arm, and the two ends of the spring are connected with the connecting arm and the mass block respectively. The two ends of the damping element are connected with the connecting arm and the mass block respectively, and the two ends of the inerter are connected with the connecting arm and the mass block respectively. The anti-seismic capacity of the existing rigid frame bridge and the newly-built bridge can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of bridge shock absorption, and in particular to a shock absorption device, a rigid frame bridge and a rigid frame bridge shock absorption method. Background Art

[0002] There are many deep valleys in the central and western parts of my country. High-pier and long-span rigid-frame bridges are widely used because of their simple structure, comfortable driving and unmatched spanning level of other beam bridges. In these areas, earthquake activities are relatively frequent, and medium and high-intensity earthquakes occur from time to time, which makes rigid-frame bridges very easy to crack and damage. Summary of the invention

[0003] The purpose of the present invention is to provide a shock absorbing device, a rigid frame bridge and a method for shock absorbing a rigid frame bridge, so as to solve the problems existing in the above-mentioned prior art and improve the earthquake resistance of existing rigid frame bridges and newly built bridges.

[0004] To achieve the above object, the present invention provides the following solutions:

[0005] The present invention provides a shock absorbing device, comprising: a mass block, a connecting arm, a damping element, an inertia container and a spring; the mass block is movably arranged in a box beam along a longitudinal direction of the bridge; the top of the connecting arm is fixedly connected to a top plate of the box beam; the bottom of the connecting arm extends downward; the mass block is located at one side of the connecting arm; the two ends of the spring are respectively connected to the connecting arm and the mass block; the two ends of the damping element are respectively connected to the connecting arm and the mass block; and the two ends of the inertia container are respectively connected to the connecting arm and the mass block.

[0006] Preferably, the damping element, the inertia container and the spring are all fixedly connected to the mass block; the damping element, the inertia container and the spring are all fixedly connected to the connecting arm; the damping element, the inertia container and the spring are all arranged along the direction of the bridge; the mass block is slidably arranged in the box girder along the horizontal direction.

[0007] Preferably, it also includes a sliding sleeve and a sliding rod, one end of the sliding rod is inserted into the sliding sleeve from one end of the sliding sleeve, and under the action of external force, the sliding rod and the sliding sleeve can only produce relative movement along the bridge direction; the other end of the sliding sleeve is fixedly connected to the mass block, and the other end of the sliding rod is fixedly connected to the connecting arm.

[0008] Preferably, it also includes a connecting plate, which is fixedly connected to the top plate of the box beam, and the top of the connecting arm is connected to the connecting plate.

[0009] Preferably, the inertia container adopts a ball screw type inertia container.

[0010] Preferably, a plurality of rollers are arranged at the bottom of the mass block.

[0011] Preferably, the connecting plate and the connecting arm are both made of metal.

[0012] Preferably, at least the portion of the slide rod located in the slide sleeve is a prismatic structure, and a cavity matching the shape of the slide rod is provided in the slide sleeve.

[0013] The present invention also provides a rigid frame bridge, comprising a box girder and a plurality of shock absorbing devices as described above, wherein the plurality of shock absorbing devices are arranged in the box girder, and the mass block is slidably arranged on the inner bottom surface of the box girder.

[0014] Preferably, at least a portion of the inner bottom surface of the box beam is processed into a horizontal plane, and the mass block is arranged on the horizontal plane.

[0015] The present invention also provides a method for shock absorbing a rigid frame bridge, wherein a plurality of shock absorbing devices as described above are installed in a box girder of the rigid frame bridge.

[0016] Compared with the prior art, the present invention has achieved the following technical effects:

[0017] 1. The present invention can reduce the tensile stress of the box girder cross section of the rigid frame bridge under vibration, thereby achieving crack control of the box girder without making major changes to the structure.

[0018] 2. Compared with the case without dampers, the displacement and bending moment response of the main piers of the rigid frame bridge under earthquake action are also reduced, thereby achieving the benefits of full-bridge seismic control.

[0019] 3. In addition to having a better shock absorption control effect, the shock absorbing device has a much smaller additional mass, which is about 0.01 of the total mass of the bridge box girder, two orders of magnitude smaller, and will not cause a greater burden on the structure. In addition, under the limitations of the damping element and the inertia container, the displacement stroke of the mass block is short, which is more suitable for installation inside the box girder of the rigid frame bridge. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the installation position of the shock absorbing device in the rigid frame bridge provided by the present invention;

[0022] Figure 2 It is a cross-sectional view of a rigid frame bridge equipped with a shock absorbing device along the transverse direction of the bridge;

[0023] Figure 3 It is a cross-sectional view of a rigid frame bridge equipped with a shock absorbing device along the longitudinal direction of the bridge;

[0024] Figure 4 This is a schematic diagram of the structure of the TMDI system in an embodiment of the present invention;

[0025] Figure 5 It is a schematic diagram of installing a shock absorbing device in an embodiment of the present invention;

[0026] Figure 6 for Figure 5 A schematic diagram of the structure of the middle guide assembly in the extended state and the shortened state;

[0027] Figure 7 A schematic diagram of the installation steps of installing the shock absorbing device in the embodiment of the present invention in a box beam;

[0028] In the figure: 1-box beam; 2-shock absorption device; 3-mass block; 4-damping element; 5-spring; 6-inertia container; 7-guide assembly; 8-connecting plate; 9-connecting arm; 10-bottom platform; 11-roller; 12-sleeve; 13-slide rod; 14-installation part. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] The inventors have found through research that existing steel structure bridges are easily damaged in earthquakes, especially the main bridge box girders will have serious cracking, especially the web and the bottom plate in the joint area.

[0032] After earthquake damage analysis and research, it is shown that when the peak acceleration reaches 0.3g to 0.4g or above, the box girder of high-pier continuous rigid frame bridge may crack. This makes the more than 100 high-pier continuous rigid frame bridges in central and western China face the problem of seismic reinforcement of the main beam. In the relevant technology, the existing rigid frame bridge is reinforced by using reinforcement technology, but it requires major changes to the box girder, that is, the main beam structure.

[0033] Combine the following Figures 1 to 7 , describing an embodiment of the present invention.

[0034] The present invention provides a shock absorbing device 2, such as Figure 2 to Figure 4 As shown, it includes: a mass block 3, a connecting arm 9, a damping element 4, an inertia container 6 and a spring 5; the mass block 3 is movably arranged in the box beam 1 along the longitudinal direction of the bridge, the top of the connecting arm 9 is fixedly connected to the top plate of the box beam 1, and the bottom of the connecting arm 9 extends downward, the mass block 3 is located on one side of the connecting arm 9, the two ends of the spring 5 are respectively connected to the connecting arm 9 and the mass block 3, the two ends of the damping element 4 are respectively connected to the connecting arm 9 and the mass block 3, and the two ends of the inertia container 6 are respectively connected to the connecting arm 9 and the mass block 3.

[0035] like Figure 4 As shown, the mass block 3, the damping element 4, the inertia container 6 and the spring 5 constitute a TMDI system.

[0036] The present invention can reduce the tensile stress in the cross section of the box girder 1 of the rigid frame bridge under vibration, thereby achieving crack control of the box girder 1. And no major changes are required to the structure. Compared with the case without a damper, the displacement and bending moment response of the main pier of the rigid frame bridge under earthquake action are also reduced, thereby achieving the benefits of shock absorption control of the entire bridge. In addition to having a better shock absorption control effect, the shock absorbing device 2 has a much smaller additional mass, which is about 0.01 of the total mass of the bridge box girder 1, which is two orders of magnitude smaller, and will not cause a greater burden on the structure. In addition, under the constraints of the damping element 4 and the inertia container 6, the displacement stroke of the mass block 3 is short, which is more suitable for installation inside the box girder 1 of the rigid frame bridge.

[0037] In some embodiments, the damping element 4, the inertia container 6, and the spring 5 are all fixedly connected to the mass block 3; the damping element 4, the inertia container 6, and the spring 5 are all fixedly connected to the connecting arm 9; the damping element 4, the inertia container 6, and the spring 5 are all arranged along the direction of the bridge; the mass block 3 is slidably arranged in the box girder 1 along the horizontal direction.

[0038] This embodiment forms a TMDI vibration reduction system in the direction of the bridge to control vibration in the direction of the bridge.

[0039] In some embodiments, such as Figure 5-6 As shown, the embodiment of the present invention also includes a sliding sleeve 12 and a sliding rod 13, and the sliding sleeve 12 and the sliding rod 13 constitute a guiding assembly 7. One end of the sliding rod 13 is inserted into the sliding sleeve 12 from one end of the sliding sleeve 12. Under the action of external force, the sliding rod 13 and the sliding sleeve 12 can only produce relative movement along the bridge direction; the other end of the sliding sleeve 12 is fixedly connected to the mass block 3, and the other end of the sliding rod 13 is fixedly connected to the connecting arm 9.

[0040] The sliding sleeve 12 and the sliding rod 13 in this embodiment can slide relative to each other in the horizontal direction, that is, fix the vertical and lateral displacement of the shock absorbing device 2, so that the mass block 3 can always maintain contact with the horizontal plane of the bottom of the box beam 1 and move along the bridge direction during operation.

[0041] In some embodiments, the embodiments of the present invention further include a connecting plate 8 , which is fixedly connected to the top plate of the box beam 1 , and the top of the connecting arm 9 is connected to the connecting plate 8 .

[0042] In some embodiments, the inertia container 6 is a ball screw type inertia container 6 .

[0043] In some embodiments, a plurality of rollers 11 are disposed at the bottom of the mass block 3 .

[0044] This embodiment reduces the resistance to the movement of the mass block 3. Of course, in some embodiments, the roller 11 may not be provided, and the bottom surface of the mass block 3 can be directly in sliding contact with the horizontal plane.

[0045] In some embodiments, the connecting plate 8 and the connecting arm 9 are both made of metal, such as steel.

[0046] In some embodiments, at least a portion of the slide rod 13 located in the slide sleeve 12 is a prismatic structure, and a cavity matching the shape of the slide rod 13 is disposed in the slide sleeve 12 .

[0047] This embodiment limits the relative displacement of the sliding sleeve 12 and the sliding rod 13 in the vertical and lateral directions, and limits the rotational freedom of each other.

[0048] The prism structure can be a quadrangular prism, a pentagonal prism, a triangular prism, etc.

[0049] The installation process is as follows:

[0050] Step 1: Open a hole at a corresponding position of the top plate of the box beam 1, and use the hole structure to install the connecting plate 8 on the top plate, for example, by connecting with high-strength bolts; and set a bottom platform 10 on the bottom plate of the box beam 1 on one side of the connecting plate 8, and the upper surface of the bottom platform 10 forms the above-mentioned horizontal plane;

[0051] Step 2: Install the connecting arm 9 on the connecting plate 8, and tightly connect the connecting arm 9 to the top connecting plate 8 through high-strength bolts;

[0052] Step three, place the mass block 3 on a horizontal plane, and connect the mass block 3 and the connecting arm 9 through the spring 5, the damping element 4, the inertia container 6, the sliding sleeve 12 and the sliding rod 13 to form a complete TMDI system.

[0053] like Figure 7 As shown, the installation order is a→b→c→d.

[0054] The present invention further provides a rigid frame bridge, comprising a box beam 1 and a plurality of shock absorbing devices 2 as described above, wherein the plurality of shock absorbing devices 2 are all arranged in the box beam 1, and a mass block 3 is slidably arranged on the inner bottom surface of the box beam 1.

[0055] In some embodiments, at least a portion of the inner bottom surface of the box beam 1 is processed into a horizontal plane, and the mass block 3 is disposed on the horizontal plane.

[0056] The present invention also provides a method for shock absorbing a rigid frame bridge, wherein a plurality of shock absorbing devices 2 as described in the above embodiment are installed in a box girder 1 of the rigid frame bridge.

[0057] like Figure 1 As shown, the side span closure section, the mid-span closure section, the top of the main pier and the half of the side span of the rigid frame bridge are defined as installation locations 14. These locations are prone to serious damage under earthquake action, and shock-absorbing devices 2 are installed at the installation locations 14 in the figure.

[0058] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A shock absorbing device, characterized in that: include: Mass, connecting arm, damping element, inertia vessel and spring; The mass block is movably arranged in the box girder along the longitudinal direction of the bridge, the top of the connecting arm is fixedly connected to the top plate of the box girder, the bottom of the connecting arm extends downward, the mass block is located on one side of the connecting arm, the two ends of the spring are respectively connected to the connecting arm and the mass block, the two ends of the damping element are respectively connected to the connecting arm and the mass block, and the two ends of the inertia container are respectively connected to the connecting arm and the mass block.

2. The shock absorbing device according to claim 1, characterized in that: The damping element, the inertia container, and the spring are all fixedly connected to the mass block; the damping element, the inertia container, and the spring are all fixedly connected to the connecting arm; the damping element, the inertia container, and the spring are all arranged along the direction of the bridge; the mass block is slidably arranged in the box beam along the horizontal direction.

3. The shock absorbing device according to claim 2, characterized in that: It also includes a sliding sleeve and a sliding rod, one end of the sliding rod is inserted into the sliding sleeve from one end of the sliding sleeve, and under the action of external force, the sliding rod and the sliding sleeve can only produce relative movement along the bridge direction; the other end of the sliding sleeve is fixedly connected to the mass block, and the other end of the sliding rod is fixedly connected to the connecting arm.

4. The shock absorbing device according to claim 1, characterized in that: It also includes a connecting plate, which is fixedly connected to the top plate of the box beam, and the top of the connecting arm is connected to the connecting plate.

5. The shock absorbing device according to claim 1, characterized in that: The inertia container adopts a ball screw type inertia container.

6. The shock absorbing device according to claim 1, characterized in that: A plurality of rollers are arranged at the bottom of the mass block.

7. The shock absorbing device according to claim 4, characterized in that: The connecting plate and the connecting arm are both made of metal.

8. The shock absorbing device according to claim 3, characterized in that: At least the portion of the slide rod located in the slide sleeve is a prismatic structure, and a cavity matching the shape of the slide rod is provided in the slide sleeve.

9. A rigid frame bridge, characterized in that: It comprises a box beam and a plurality of shock absorbing devices according to any one of claims 1 to 8, wherein the plurality of shock absorbing devices are arranged in the box beam, and the mass block is slidably arranged on the inner bottom surface of the box beam.

10. A method for reducing vibration of a rigid frame bridge, characterized in that: A plurality of shock absorbing devices according to any one of claims 1 to 8 are installed in the box girder of the rigid frame bridge.

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