A damping anti-collision wind limiting device, a suspension bridge steel truss girder and a suspension bridge

Abstract

The application discloses a damping anti-collision wind-limiting device, a suspension bridge steel truss beam and a suspension bridge, and relates to the technical field of suspension bridge damping limiting, which comprises a damping constraint device and a hinged structure; the damping constraint device comprises connecting pieces, stiffness elements and damping elements; the connecting pieces are two and parallel to each other and are used for connecting two adjacent steel truss pieces; the stiffness elements are arranged between the two connecting pieces and are used for supporting the two adjacent steel truss pieces. The application has the beneficial effects that: through the upper chord hinging, the stiffness elements and the damping elements are installed in parallel between the lower chord bars to form a temporary constraint system, which can ensure that the adjacent steel truss beam segments form a continuous constrained whole during the construction process, so that when the suspension bridge in the construction state is subjected to wind load in any state, the relative displacement between the lower chord bars is slowly generated, and the temporary constraint system provides damping for the suspension bridge system in the construction state, and the dynamic performance such as wind resistance and earthquake resistance is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of damping and limiting of suspension bridges, in particular to a damping anti-collision wind-limiting device, a steel truss girder of a suspension bridge and the suspension bridge. BACKGROUND

[0002] With the development of the bridge industry, more and more long-span bridge structures such as cable-stayed bridges, suspension bridges and arch bridges are built at home and abroad. In order to ensure the stiffness of the suspension bridge in mountainous areas, the steel truss girder stiffening beam scheme is often used, such as Siduhe Bridge, Balinhe Bridge and Aizhai Bridge. The erection method of the main span of the steel truss stiffening girder generally starts from the segment in the middle of the span and advances towards the cable tower direction. During the erection process, the linear change of the main cable and the steel truss girder is large, and the included angle between the adjacent segments of the erected stiffening girder will change with the hoisting of the remaining segments. In order to make the linear shape of the stiffening girder adapt to the deformation of the main cable and adjust the balance force between the hoisting cables, the upper chord between the segments of the stiffening girder is temporarily connected, and the lower chord is not connected. After the stiffening girder of the whole bridge is hoisted, permanent connection is made.

[0003] The temporary connection has the following disadvantages: the connection of the lower chord only uses one-way connection, which cannot effectively suppress the reciprocating motion of the steel beam after being subjected to wind; when the joint of the lower chord of the steel beam gradually opens, the accumulated potential energy will also continuously increase; when the potential energy is released, the steel beam will collide relatively violently, which will have a great impact on the structure of the steel beam; in addition, the lower chord locking method of the temporary connection method can only be installed in a suitable state, and is easily limited by the spatial position, state and other factors of the steel beam; finally, the temporary connection method does not have damping elements, and cannot absorb the vibration energy generated by the steel beam due to wind load; when encountering strong wind, the steel beam will vibrate strongly, which may damage the connecting parts on the lower chord of the steel beam and affect the construction progress of the steel beam splicing; therefore, it is necessary to provide a damping anti-collision wind-limiting device at the butt joint of the lower chord. SUMMARY

[0004] The present application aims to overcome the deficiencies of the prior art and provide a damping anti-collision wind-limiting device, a steel truss girder of a suspension bridge and the suspension bridge.

[0005] In a first aspect, the damping anti-collision wind-limiting device is arranged between two adjacent steel truss pieces of a steel truss girder of a suspension bridge, and includes a damping constraint device and a hinged structure.

[0006] The damping constraint device includes a connecting piece, a stiffness element and a damping element.

[0007] The connecting piece includes two connecting pieces which are parallel to each other and used for connecting the two adjacent steel truss pieces.

[0008] The stiffness element is arranged between the two connecting pieces and used for supporting the two adjacent steel truss pieces.

[0009] A damping element is arranged in parallel below the stiffness element and between the two connectors to dissipate the vibration energy of the two adjacent steel truss plates.

[0010] A hinged structure is connected to the two adjacent steel truss plates to realize the hinging of the two steel truss plates.

[0011] Further, the damping element comprises a ring-shaped steel wire rope damper, which comprises two steel plates and a ring-shaped rope.

[0012] The two steel plates are arranged at a relative distance, and each of the steel plates is provided with a plurality of rope clamping holes.

[0013] The ring-shaped rope is arranged between the two steel plates and sequentially passes through the plurality of rope clamping holes on the two steel plates to form a spiral structure.

[0014] Further, the steel plate comprises two oppositely close steel blocks, and the opposite end surfaces of the two steel blocks are respectively provided with a plurality of semicircular holes, and the semicircular holes of the two oppositely close steel blocks form the rope clamping hole.

[0015] Further, the damping element comprises a plurality of ring-shaped steel wire rope dampers, which are connected in series between the two connectors of the damping restraint device along the length direction of the steel truss girder of the suspension bridge.

[0016] Further, the damping element comprises a viscous damper.

[0017] Further, the stiffness element comprises a spring, and the two ends of the spring in the axial direction are respectively connected to the two connectors.

[0018] Further, the hinged structure comprises:

[0019] Two hinged seats are arranged on the two steel truss plates, respectively.

[0020] A rotating rod is hinged to the two hinged seats.

[0021] Further, the steel truss plate comprises an upper chord, a lower chord, and a fixing rod, and the fixing rod connects the upper chord and the lower chord.

[0022] Further, the steel truss plate comprises an upper chord, a lower chord, and a fixing rod, and the fixing rod connects the upper chord and the lower chord.

[0023] Further, it further comprises a main cable and a plurality of hangers, the main cable is arranged along the length direction of the steel truss girder of the suspension bridge, the plurality of hangers are distributed along the length direction of the main cable, and the hangers connect the main cable and the steel truss plate.

[0024] Compared with the prior art, the advantages of the present application are as follows: by means of upper chord hinging, installing damping restraint devices with stiffness elements and damping elements in parallel between lower chord bars, the adjacent steel truss beam segments can be ensured to form a continuous restrained whole in the construction process, so that the relative displacement between the lower chord bars of the construction state suspension bridge is slowly generated when the construction state suspension bridge is subjected to wind load in any state, and the temporary restraint system provides damping for the construction state suspension bridge system, and improves the wind resistance, earthquake resistance and other dynamic performances. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the overall front view schematic diagram in the present application.

[0026] Figure 2 is the mechanical schematic diagram of the damping restraint system in the present application.

[0027] Figure 3 is the structure schematic diagram of the long strip steel plate ring steel wire rope damper in the present application.

[0028] Figure 4 is the structure schematic diagram of the ring steel plate ring steel wire rope damper in the present application.

[0029] Figure 5 is the front structure schematic diagram of the damping restraint device in the present application.

[0030] Figure 6 is the front structure schematic diagram of the ring steel wire rope damper in the present application.

[0031] In the drawings:

[0032] 1, main cable;

[0033] 2, sling;

[0034] 3, upper chord bar;

[0035] 4, hinged structure; 401, hinged seat; 402, rotating rod;

[0036] 5, lower chord bar;

[0037] 6, damping restraint device;

[0038] 7, connecting piece;

[0039] 8, stiffness element;

[0040] 9, damping element;

[0041] 10, ring steel wire rope damper; 1001, steel plate; 1002, ring rope. DETAILED DESCRIPTION

[0042] Reference will now be made in detail to the present embodiments of the application, examples of which are illustrated in the accompanying drawings. While the application will be described in conjunction with the specific embodiments, it will be understood that the application is not limited to the embodiments described. On the contrary, the application is intended to cover alternatives, modifications and equivalents, which are within the spirit and scope of the application, as defined by the appended claims. It should be noted that the steps of the methods described herein can all be implemented by any functional block or functional arrangement, and any functional block or functional arrangement can be implemented as a physical entity or a logical entity, or a combination of both.

[0043] In order to better understand the present application, the following further describes the present application in conjunction with the accompanying drawings and specific embodiments.

[0044] Note: The examples to be introduced next are only specific examples, and are not intended to limit the embodiments of the present application to the specific steps, values, conditions, data, sequences, etc. Those skilled in the art can use the concept of the present application to construct more embodiments not mentioned in the present specification by reading the present specification.

[0045] The disadvantages of the existing temporary connection are that the connection of the lower chord only uses a one-way connection, and cannot effectively suppress the reciprocating movement of the steel beam after wind, and when the steel beam lower chord joint gradually opens, the accumulated potential energy will also increase continuously, and when the potential energy is released, the steel beam will collide relatively violently, which will have a great influence on the structure of the steel beam. In addition, the lower chord locking mode of the temporary connection method can only be installed in a suitable state, and is easily limited by the spatial position, state and other factors of the steel beam; finally, the temporary connection method does not have a damping element, and cannot absorb the vibration energy of the steel beam due to wind load, and when encountering strong wind weather, the steel beam will produce relatively strong vibration, and when serious, it will damage the connecting piece on the lower chord of the steel beam, and affect the construction progress of the steel beam splicing; therefore, it is necessary to set a damping anti-collision wind limiting device at the lower chord butt joint.

[0046] In order to solve the problems existing in the lower chord of the suspension bridge steel truss girder, the lower chord damping anti-collision wind limiting device provided by the present application, embodiment one, please refer to Figure 1 , Figure 2A damping restraint device 6 and a hinged structure 4 are installed between two adjacent steel truss segments of a suspension bridge. The damping restraint device 6 includes a connector 7, a stiffness element 8, and a damping element 9. Two connectors 7 are arranged parallel to each other for connecting two adjacent steel truss segments. The stiffness element 8 is positioned between the two connectors 7 to support the two adjacent steel truss segments. The damping element 9 is positioned parallel to the stiffness element 8 below it and between the two connectors 7 to dissipate the vibration energy of the two adjacent steel truss segments. The hinged structure 4 connects to the two adjacent steel truss segments, achieving the hinged connection between them. This mechanism effectively provides a damping restraint device between the two steel truss segments. The stiffness element 8 is mainly used to maintain the relative displacement of the lower chords 5 of adjacent beam segments. The damping element 9 is used to control the movement of the suspension bridge under wind load or seismic action, and to play a role in buffering and energy dissipation, thereby improving wind and seismic resistance. Without the stiffness element 8, the damping device alone cannot maintain the relative position between adjacent lower chords 5. Under the action of a small external force, the displacement between the lower chords 5 will also change, which is not conducive to maintaining the alignment between beam segments. Without the damping element 9, it is impossible to provide additional damping for the temporary damping constraint device 6. The dynamic response of the steel beam under wind and seismic action will be large, and it will not be able to provide buffering and energy dissipation.

[0047] Example 2, please refer to Figure 3 , Figure 4 , Figure 6 The damping element 9 includes a ring-shaped wire rope damper 10, which comprises two steel plates 1001 and a ring rope 1002. The two steel plates 1001 are arranged at a relative distance, and each steel plate 1001 has multiple rope clamping holes. The ring rope 1002 is disposed between the two steel plates 1001 and passes through the multiple rope clamping holes on the two steel plates 1001 in sequence to form a spiral structure. Each steel plate 1001 comprises two relatively close steel blocks, and the opposite end faces of the two steel blocks are respectively provided with multiple semi-circular holes. The semi-circular holes of the two relatively close steel blocks enclose each other to form a rope clamping hole. The damping element 9 includes multiple annular wire rope dampers 10, which are connected in series between the two connectors 7 of the damping constraint device 6 along the length of the steel truss of the suspension bridge. This serves to provide stiffness constraint through the elastic stiffness of the annular rope 1002 when it deforms, and to provide damping through the internal friction between the annular ropes 1002. The advantages of this device are its simple structure, low precision requirements for processing and installation, resistance to damage in complex construction environments, ease of construction, and high cost-effectiveness. When the steel beam vibrates under wind load, it drives the upper and lower support plates to move relative to each other, thereby stretching or compressing the annular rope 1002. Relative friction between the annular ropes 1002 absorbs and dissipates the energy of the wind load. Furthermore, the annular rope 1002 has a certain stiffness, effectively preventing collisions with the steel beam, thus achieving the function of wind and collision prevention and limiting.

[0048] Example 3, please refer to Figure 5 The damping element 9 includes a viscous damper; the viscous damper is a passive velocity-dependent damper designed and manufactured based on the principle of generating damping force through the interaction between viscous medium and damping storage structure components. It is generally composed of a cylinder, piston, damping orifice, damping medium (viscous fluid) and guide rod. When the engineering structure deforms due to vibration, the piston and cylinder of the viscous damper installed in the structure move relative to each other. Due to the pressure difference before and after the piston, the viscous fluid passes through the damping orifice, thereby generating damping force and dissipating the vibration energy input to the structure from the outside.

[0049] The stiffness element 8 includes a spring, with each of the two ends of the spring connected to one of the two connecting parts 7 respectively; a cylindrical helical spring is used to provide stiffness and a damper is used to provide damping, with the spring and damper connected in parallel.

[0050] The hinge structure 4 includes: two hinge seats 401, respectively set on two steel truss segments; a rotating rod 402, hinged to the two hinge seats 401, including at least two steel truss segments spaced apart along its length; a damping anti-collision and wind-resistant limiting device connected between the two steel truss segments; the steel truss segments include an upper chord 3, a lower chord 5, and a fixed rod; the fixed rod connects the upper chord 3 and the lower chord 5; it also includes a main cable 1 and multiple suspenders 2; the main cable 1 is set along the length of the suspension bridge steel truss beam; the multiple suspenders 2 are distributed along the length of the main cable 1; the suspenders 2 connect the main cable 1 and the steel truss segments, providing support for the two steel truss segments and maintaining a relative distance between them, facilitating subsequent installation and movement by workers.

[0051] When using this invention, the damping constraint device 6, whose mechanical prototype is composed of a stiffness element 8 and a damping element 9 connected in parallel, temporarily constrains the lower chord 5 into a whole. When the main cable 1 changes shape during the erection of the steel truss, causing a slow change in the relative position of the lower chord 5 of the erected beam segment, the damping constraint device 6 allows for relative displacement changes between the lower chord 5 of the beam segment. Its damping element 9 does not generate additional force, and the stiffness element 8 generates a small additional force. When wind loads, earthquakes, or other dynamic effects occur during construction, due to the constraint of the stiffness element 8 and the damping element 9 between the lower chord 5, the lower chord 5 of adjacent segments will only undergo slow relative movement, and will not cause a sudden movement and collision as in the relaxed state.

[0052] The damping restraint device 6 is manufactured as a whole in the factory according to the design drawings, including the device body and the connecting parts 7. After arriving at the construction site, as the adjacent steel truss beams are hoisted into place, the upper chord 3 is hinged, and the device connects the connecting parts 7 to the lower chord 5 of the adjacent beam segment with bolts. After the connection is completed, the device allows the lower chord 5 to undergo relative displacement and relative proximity. After all the steel truss beams are erected in place and the relative deformation of the steel beams is adjusted, the beam segments are permanently connected (welded or connected with high-strength bolts) and the damping restraint device 6 is removed.

[0053] It should be noted that the installation of the damping constraint device 6 should not affect the permanent connection between subsequent beam segments. It can be installed on the side of the lower chord 5 and connected by bolts, which is convenient for operation during installation.

[0054] In the description of this invention, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the 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, and therefore should not be construed as a limitation of the invention. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0055] It should be noted that in this invention, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0056] The above description is merely a specific embodiment of the present invention, enabling those skilled in the art to understand or implement the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features of the invention herein.

Claims

1. A damping, anti-collision, and wind-resistant limiting device, installed between two adjacent steel truss segments of a suspension bridge, characterized in that, include: Damping constraint device (6) and hinge structure (4); The damping constraint device (6) includes a connector (7), a stiffness element (8), and a damping element (9); The connector (7) comprises two parallel members for connecting two adjacent steel truss segments; A stiffening element (8) is disposed between two connectors (7) to support the two adjacent steel truss segments; The damping element (9) is arranged parallel to the stiffness element (8) below and between the two connectors (7) to dissipate the vibration energy of the two adjacent steel truss plates. The hinge structure (4) is connected to the two adjacent steel trusses to realize the hinge of the upper chord of the two steel trusses; The damping element (9) includes multiple annular wire rope dampers (10), each annular wire rope damper (10) including two steel plates (1001) and an annular rope (1002). The two steel plates (1001) are arranged at a relative distance, and each steel plate (1001) is provided with a plurality of rope clamp holes; The annular rope (1002) is disposed between the two steel plates (1001) and passes through multiple rope clamping holes on the two steel plates (1001) in sequence to form a spiral structure; Multiple annular wire rope dampers (10) are connected in series between two connectors (7) of the damping restraint device (6) along the length of the steel truss of the suspension bridge; The damping constraint device (6) is connected to the lower chord of two adjacent steel trusses to realize the connection of the two steel trusses; The damping constraint device (6) is installed on the side of the lower chord (5) and is connected by bolts, which does not affect the subsequent permanent connection between the two steel truss segments; After a permanent connection is made between the two steel truss sections, the damping constraint device (6) is removed.

2. The damping anti-collision and wind-resistant limiting device as described in claim 1, characterized in that, The steel plate (1001) includes two relatively close steel blocks, and the opposite end faces of the two steel blocks are respectively provided with a plurality of semi-circular holes. The semi-circular holes of the two relatively close steel blocks surround each other to form the rope clamp hole.

3. The damping anti-collision and wind-resistant limiting device as described in claim 1, characterized in that, The stiffness element (8) includes a spring, and the two ends of the spring are respectively connected to two connecting parts (7).

4. The damping anti-collision and wind-resistant limiting device as described in claim 1, characterized in that, The hinge structure (4) includes: Two hinged seats (401) are respectively installed on two steel truss plates; The rotating rod (402) is hinged to the two hinge seats (401).

5. A steel truss girder for a suspension bridge, characterized in that, It includes at least two steel truss segments spaced apart along its length, and further includes a damping anti-collision and wind-resistant limiting device as described in any one of claims 1-4; the damping anti-collision and wind-resistant limiting device is connected between the two steel truss segments.

6. The suspension bridge steel truss girder as described in claim 5, characterized in that, The steel truss includes an upper chord (3), a lower chord (5), and a fixing rod, which connects the upper chord (3) and the lower chord (5).

7. A suspension bridge, characterized in that, The suspension bridge steel truss as described in claim 6 includes a main cable (1) and a plurality of suspenders (2), wherein the main cable (1) is arranged along the length direction of the suspension bridge steel truss, and the plurality of suspenders (2) are distributed along the length direction of the main cable (1), and the suspenders (2) connect the main cable (1) and the steel truss.

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