Expansion device for bridge widening

Abstract

The present invention discloses an expansion device for bridge widening, which includes a cover plate and a damper. The cover plate is used to span the gap between the new bridge and the old bridge. The damper includes a cavity structure, an anchor and an elastoplastic filler. The cavity structure is used to be fixed at the flange position of the beam body of the new bridge or the old bridge. The elastoplastic filler is filled in the cavity structure. The top of the anchor is connected to the end of the cover plate, and the bottom of the anchor is movably embedded in the elastoplastic filler. Both ends of the cover plate are respectively connected to the flange positions of the beam bodies of the new bridge and the old bridge through dampers. In the present invention, both ends of the cover plate are connected to the flange positions of the beam bodies of the new bridge and the old bridge through dampers buffered by elastoplastic fillers, which can effectively adapt to the uneven settlement of the beam bodies on both sides of the new bridge and the old bridge, as well as the inconsistent height differences and angular changes generated under the actions of concrete creep, temperature, wind force, load, etc., and keep the joints of the beam bodies on both sides of the new bridge and the old bridge in a flat and smooth transition connection.

Description

Technical Field

[0001] The present invention belongs to the field of bridge construction, relates to bridge widening technology, and particularly relates to an expansion device for bridge widening. Background Art

[0002] With the increasing number of private cars year by year and the accelerating urban development, the frequency of people's travel has increased. Many existing roads can no longer meet the actual traffic capacity, with low design loads and too small bridge deck widths, unable to meet the current traffic demands. However, reconstructing bridges is costly and will cause traffic interruptions. Therefore, there is an urgent need to transform them, and bridge widening has become a common method for renovating old bridges. When widening and reconstructing old roads and connecting the new and old bridges together, due to the inconsistent shrinkage and creep of the two, the concrete of the new bridge undergoes shrinkage and creep, which will generate relatively large additional stresses on the old bridge. In practical applications, a widening mode where both the upper and lower parts of the new and old bridges are not connected is mostly adopted, and an expansion device is longitudinally arranged between the new and old bridges to ensure normal traffic on the road surface. This method can make the overall stress of the bridge uniform, and the upper and lower structural parts of the new and old bridges do not affect each other, with low construction difficulty and wide application. However, the longitudinal expansion device connecting the new and old bridges is particularly crucial.

[0003] Bridge deck widening is different from the construction of new bridges, and the requirements for bridge expansion devices are more stringent. In order to connect two separate beam bodies (the new bridge and the old bridge) into a whole and enable vehicles to pass freely and smoothly between the two beams, many problems such as the longitudinal displacement, lateral displacement of the bridge, and the vertical misalignment between the two beams (the new bridge and the old bridge) need to be solved, and the existing expansion devices can no longer meet the requirements.

[0004] Existing processes mostly adopt steel section expansion devices. Two steel sections are respectively arranged on both sides of the new bridge and the old bridge, and are connected by a rubber water stop in the middle. There are still gaps in the actual road surface. There are no problems with longitudinal and lateral displacements, but there are relatively large potential hazards in vertical displacement. The foundation settlement of the old bridge is basically determined, but the settlement amount of the new bridge cannot be effectively determined, and it may also change later. It is very difficult to ensure that the new bridge is at the same height as the old bridge after being finalized. Therefore, there will be a certain height difference between the beam bodies on both sides of the expansion device. At the same time, the longitudinal expansion device is arranged at the flange position of the beam bodies of the new and old bridges. When a vehicle passes through, the beam body will rotate under its own weight, and the flange position will sink, forming a height difference with the opposite beam body. When the above two situations are superimposed, there will be no problem for the vehicle to drive from high to low, only the phenomenon of vehicle jumping. However, when the vehicle drives from low to high, if the vehicle speed is relatively fast, it is extremely easy to be dangerous. In addition, the vehicle continuously impacts the steel section, which will also accelerate the damage of the expansion device and problems such as the crumbling of the surrounding concrete.

[0005] Therefore, there is an urgent need for a new type of longitudinal expansion device to effectively adapt to the vertical height change of the new and old bridges after bridge widening and ensure the smoothness and comfort of the vehicle when passing through the joint. Summary of the Invention

[0006] The object of the present invention is to provide an expansion device for bridge widening, which can effectively adapt to the vertical height change between the new bridge and the old bridge after bridge widening, ensure the smoothness and comfort of the vehicle passing through the joint, and further solve the technical problem in the prior art that it is difficult to ensure that the new bridge is at the same height as the old bridge after shaping.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] The present invention provides an expansion device for bridge widening, comprising:

[0009] A cover plate, which is arranged to span the gap between the new bridge and the old bridge to achieve a smooth transition between the new bridge and the old bridge;

[0010] A damper, which includes a cavity structure, an anchor and an elastoplastic filler. The cavity structure is used to be fixed at the flange position of the beam body of the new bridge or the old bridge; the elastoplastic filler is filled in the cavity structure, the top of the anchor is connected to the end of the cover plate, and the bottom of the anchor is movably buried in the elastoplastic filler;

[0011] Both ends of the cover plate are respectively connected to the flange position of the beam body of the new bridge and the flange position of the beam body of the old bridge through the damper.

[0012] Optionally, a plurality of cover plates are provided, and the plurality of cover plates are arranged in sequence along the extension direction of the gap.

[0013] Optionally, the cavity structure is a cylindrical cavity or a prismatic cavity; the cavity structure is filled with the elastoplastic filler, or a part of the space in the cavity structure is filled with the elastoplastic filler.

[0014] Optionally, the cavity structure is a semi-closed cavity with an open top, and the top of the anchor extends out through the open top of the semi-closed cavity to be connected to the end of the cover plate.

[0015] Optionally, the cavity structure is a closed cavity, and a movable avoidance hole for the top of the anchor to pass through is opened at the top of the closed cavity.

[0016] Optionally, a protrusion is provided on the anchor, and the protrusion protrudes towards the outer peripheral direction of the anchor, and the protrusion is buried in the elastoplastic filler.

[0017] Optionally, the anchor is a bolt, a screw rod, an anchor bar, a square steel or a steel plate; the protrusion is welded, thread-connected, riveted or integrally formed with the anchor, and the protrusion is located at the bottom of the anchor or near the bottom of the anchor.

[0018] Optionally, the elastoplastic filler is a hot-melt organic material filler or a polymer material filler.

[0019] Optionally, the elastoplastic filler is a strain rate sensitive material filler.

[0020] Optionally, a support is provided at the bottom end of the cavity structure, and the cavity structure is fixed to the flange position of the beam body of the new bridge or the old bridge through the support.

[0021] Optionally, a water stop structure is provided on both sides of the gap between the new bridge and the old bridge.

[0022] The present invention has achieved the following technical effects compared with the prior art:

[0023] The expansion joint device for bridge widening proposed by the present invention is specifically a vertical expansion and adjustment device for bridges. Its structure is simple and novel. Both ends of the cover plate are connected to the flange positions of the beam bodies of the new bridge and the old bridge through dampers buffered by elastoplastic fillers, which can effectively adapt to the uneven settlement of the beam bodies on both sides of the new bridge and the old bridge (i.e., the height change in the vertical direction of the bridge body) and the height difference inconsistency and angular change generated under the actions of concrete creep, temperature, wind force, load, etc., and can always keep the joint between the beam bodies on both sides of the new bridge and the old bridge in a flat and smooth transition connection, ensuring the smoothness and comfort of the vehicle passing through the joint and preventing the vehicle from jumping. The present invention has the advantages of reasonable structural design, convenient installation and replacement, and low use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic diagram of the gap between the new bridge and the old bridge disclosed in the embodiment of the present invention;

[0026] Figure 2 It is a schematic diagram of the structure of the expansion joint device for bridge widening disclosed in the embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of the structure of the first damper disclosed in the embodiment of the present invention;

[0028] Figure 4 It is a schematic diagram of the structure of the second damper disclosed in the embodiment of the present invention;

[0029] Figure 5Schematic structural diagram of the third damper disclosed in the embodiments of the present invention;

[0030] Figure 6 Schematic structural diagram of the fourth damper disclosed in the embodiments of the present invention;

[0031] Figure 7 Schematic structural diagram of the fifth damper disclosed in the embodiments of the present invention;

[0032] Figure 8 Schematic diagram of the use state of the expansion device for bridge widening when the height of the new bridge body in the embodiments of the present invention is higher than that of the old bridge;

[0033] Figure 9 Schematic diagram of the use state of the expansion device for bridge widening when the height of the new bridge body in the embodiments of the present invention is lower than that of the old bridge;

[0034] Figure 10 Schematic diagram of the use state of the expansion device for bridge widening when the new bridge body in the embodiments of the present invention undergoes a counterclockwise rotation angle;

[0035] Figure 11 Schematic diagram of the use state of the expansion device for bridge widening when the new bridge body in the embodiments of the present invention undergoes a clockwise rotation angle;

[0036] Figure 12 Schematic diagram of the use state of the expansion device for bridge widening when the height of the new bridge body in the embodiments of the present invention is equal to that of the old bridge.

[0037] Among them, the reference numerals are: 100, expansion device for bridge widening;

[0038] 1, new bridge; 2, old bridge; 3, gap; 4, cover plate; 5, damper; 51, cavity structure; 52, anchor; 53, elastoplastic filler; 54, movable avoidance hole; 55, protrusion; 56, support; 6, water stop structure. Detailed implementation manners

[0039] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0040] One of the purposes of the present invention is to provide an expansion device for bridge widening, so as to effectively adapt to the change in the vertical height of the new and old bridges after bridge widening, ensure the smoothness and comfort of the vehicle when passing through the joint, and further solve the technical problem in the existing technology that it is difficult to ensure that the new bridge is at the same height as the old bridge after shaping.

[0041] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Embodiment 1

[0043] As Figure 2 shown, this embodiment provides an expansion device 100 for bridge widening, which mainly includes a cover plate 4 and a damper 5. The cover plate 4 is used to span the gap 3 between the new bridge 1 and the old bridge 2. The two ends of the cover plate 4 in the direction across the gap 3 are respectively placed on the beam flange positions of the new bridge 1 and the old bridge 2 to achieve a smooth transition between the new bridge 1 and the old bridge 2; the damper 5 includes a cavity structure 51, an anchor 52 and an elastoplastic filler 53. The cavity structure 51 is used to be fixed on the beam flange position of the new bridge 1 or the old bridge 2; the elastoplastic filler 53 is filled in the cavity structure 51. The top of the anchor 52 is connected to the end of the cover plate 4, and the bottom of the anchor 52 is movably embedded in the elastoplastic filler 53; the two ends of the cover plate 4 (i.e., the two ends of the cover plate 4 in the direction across the gap 3) are respectively connected to the beam flange positions of the new bridge 1 and the old bridge 2 through dampers 5. Among them, at least one group of dampers 5 is connected to any one end of the cover plate 4.

[0044] In this embodiment, a plurality of cover plates 4 are provided, and the plurality of cover plates 4 are arranged in sequence along the extension direction of the gap 3 (i.e., the longitudinal direction of the bridge, or also called the along-bridge direction, the driving direction). The plurality of cover plates 4 are continuously laid to cover the entire gap 3. A gap space for the cover plate 4 to shake is reserved between any adjacent cover plates 4. This gap space is small and does not affect the flat transition between the new bridge 1 and the old bridge 2.

[0045] In this embodiment, the cavity structure 51 can be a semi-closed cavity, specifically a cylindrical cavity with an open top, that is, the top surface of the cylindrical cavity is directly open, as Figure 3 shown. This cylindrical cavity is placed vertically (i.e., the axis of the cylindrical cavity is parallel or nearly parallel to the height direction of the new bridge 1 and the old bridge 2). The cylindrical cavity is filled with an elastoplastic filler 53, which can be filled with the elastoplastic filler 53, or only partially filled with the elastoplastic filler 53, such as only filling the elastoplastic filler 53 at the bottom of the cylindrical cavity. The top of the anchor 52 extends out through the top opening of the cylindrical cavity to be connected to the end of the cover plate 4. The connection here can be welding or threaded connection.

[0046] In this embodiment, the anchor 52 can be a bolt, a screw rod, an anchor bar, a square steel, a steel plate, etc. It is preferably arranged along the axis of the above-mentioned cylindrical cavity, that is, the anchor 52 is located at the center of the cylindrical cavity, and there is enough space reserved between its outer periphery and the inner wall of the cylindrical cavity to enable the anchor 52 to move or rotate (mainly rotate with the bottom of the anchor 52 as the fulcrum) to adapt to the normal displacement of the new and old bridge bodies.

[0047] Furthermore, in this embodiment, a protrusion 55 is also provided on the anchor 52. The protrusion 55 protrudes towards the outer periphery of the anchor 52, and this outer periphery direction refers to the direction perpendicular or intersecting with the length direction of the anchor 52. The protrusion 55 is buried in the elastoplastic filler 53, aiming to increase the contact area between the anchor 52 and the elastoplastic filler 53, and at the same time limit the sudden upward pull of the bottom of the anchor 52 from the elastoplastic filler 53.

[0048] In this embodiment, the protrusion 55 can be welded, thread-connected, riveted or integrally formed with the anchor 52 according to the actual operation situation. The protrusion 55 is located at the bottom of the anchor 52 or near the bottom of the anchor 52. For example, the protrusion 55 is arranged in the middle of the anchor 52, as long as it can ensure that the protrusion 55 is always buried in the elastoplastic filler 53. Among them, the protrusion 55 can be a disc structure perpendicular to the anchor 52, a quadrilateral plate structure or other polygonal plate structures, or a bolt head convenient for disassembly, and the shape is not limited. Any one of the above disc structure, quadrilateral plate structure, bolt head, etc. can be combined with any one of bolts, screw rods, anchor bars, square steels, steel plates, etc.

[0049] In this embodiment, the elastoplastic filler 53 can also be referred to as an "elastoplastic body", and can be made of a hot-melt organic material or a polymer material with elastoplastic properties, such as a composite modified asphalt material, butyl rubber, silicone rubber, thermoplastic elastomer, strain rate sensitive material, etc. As a substance that exhibits both elasticity and plasticity, the elastoplastic filler 53 is in a plastic state under the action of a low and slow force and can adapt to any slow displacement of the new and old bridge bodies. The anchor 52 and the protrusion 55 can move and rotate in all directions (a movement in a three-dimensional space) within the elastoplastic filler 53; under the action of an impact force or short-term compressive stress, it is elastic. When the vehicle impacts, brakes, or is affected by seismic force, the elastoplastic filler 53 exhibits elasticity and resists the impact. The elastoplastic filler 53 directly bears the vertical (the height direction of the bridge body or close to the height direction of the bridge body) impact force transmitted by the anchor 52 and at the same time restricts the sudden upward pull of the anchor 52. In actual operation, the elastoplastic filler 53 can be selected as a strain rate sensitive material, which is a strain rate sensitive type of self-adaptive material with unique properties such as excellent strain rate sensitivity, self-adaptability, and self-repairability. The elastoplastic filler 53 in this embodiment specifically uses Type I or Type III strain rate sensitive materials in strain rate sensitive materials, such as a gel material based on polyborosiloxane, which has good shock absorption, high elasticity, and even characteristics such as a high elasticity-rigidity transition. Among them, the movement and rotation of the anchor 52 in all directions are based on a three-dimensional space, which can be a three-dimensional space with the transverse direction of the bridge, the longitudinal direction of the bridge, and the vertical direction of the bridge as the coordinate system.

[0050] In this embodiment, a bearing 56 is provided at the bottom end of the cavity structure 51, and the cavity structure 51 is fixed to the flange position of the beam body of the new bridge 1 or the old bridge 2 through the bearing 56. In order to improve the connection stability between the damper 5 and the new bridge 1 and the old bridge 2, concrete can be poured after the bearing 56 is fixed to the flange position of the beam body of the new bridge 1 or the old bridge 2. The fixing method between the bearing 56 and the new bridge 1 and the old bridge 2 can be bolt fixing or anchor rod fixing.

[0051] In this embodiment, a water stop structure 6 is also provided on both sides of the gap 3 between the new bridge 1 and the old bridge 2. The water stop structure 6 is a conventional structure setting in the field of bridge widening, and the specific structure and working principle will not be elaborated here.

[0052] The working principle of the above-mentioned expansion device 100 for bridge widening will be specifically described below in combination with different height difference problems.

[0053] Such as Figures 8 to 12As shown in the figure, it is the state of the expansion device 100 for bridge widening when the beam bodies of the new bridge 1 and the old bridge 2 are displaced. The foundation settlement (vertical displacement) of the old bridge 2 is basically determined, but the settlement amount (vertical displacement) of the new bridge 1 cannot be effectively determined, and it may change in the later stage. It is very difficult to ensure that the new bridge 1 is at the same height as the old bridge 2 after being determined. Therefore, there will be a certain height difference between the beam bodies on both sides of the expansion device 100 for bridge widening. The expansion device 100 for bridge widening is arranged at the flange positions of the beam bodies of the new bridge 1 and the old bridge 2. When a vehicle passes by, under the action of its own weight, the bridge beam body (generally referring to the bridge of the new bridge 1 here) will rotate, and the flange position will sink, forming a height difference with the opposite bridge beam body (generally referring to the bridge of the old bridge 2 here). As Figure 8 shown in the case where the beam body height of the new bridge 1 is higher than that of the old bridge 2, Figure 9 shown in the case where the beam body height of the new bridge 1 is lower than that of the old bridge 2, Figure 10 shown in the case where the beam body of the new bridge 1 has a counterclockwise rotation angle (i.e., rotates away from the old bridge 2), Figure 11 shown in the case where the beam body of the new bridge 1 has a clockwise rotation angle (i.e., rotates towards the old bridge 2), Figure 12 shown in the case where the beam body height of the new bridge 1 is equal to that of the old bridge 2. When the displacements or rotation angles of the new bridge 1 or the old bridge 2 are inconsistent, the above-mentioned various situations will occur. At this time, the cover plate 4 will be adaptively lifted or rotated under the action of the vehicle's own weight and the elastoplastic filler 53 in the two-end dampers 5, ensuring that the cover plate 4 always spans the gap 3 between the new bridge 1 and the old bridge 2 and maintaining a flat transition between the new bridge 1 and the old bridge 2. For example, when the height positions of the new bridge 1 and the old bridge 2 are different, the cover plate 4 is inclined, forming a small slope, but it is still a flat transition and there will be no vehicle jumping. When the new bridge 1 and the old bridge 2 are at the same height, the cover plate 4 is basically horizontal and flush with the bridge road surfaces at both ends.

[0054] When the cover plate 4 and the anchor 52 move or rotate together in the cavity structure 51, there is enough moving clearance reserved between the protrusion 55 of the anchor 52 and the inner wall of the cavity structure 51, which can well adapt to the normal displacements of the new and old beam bodies on both sides.

[0055] It can be seen that the expansion device 100 for bridge widening in this technical solution not only realizes the effective cross-gap connection between the new bridge 1 and the old bridge 2, but also can effectively adapt to the uneven settlement of the new and old beam bodies on both sides, as well as the height difference inconsistency and angular change caused by concrete creep, temperature, wind force, and load. It can always keep the connection surface between the new and old beam bodies flat and there will be no vehicle jumping phenomenon.

[0056] Embodiment 2

[0057] In this embodiment, an expansion device 100 for bridge widening adopts a damper 5 different from that in Embodiment 1. As Figure 4As shown in the figure, the cavity structure 51 of the damper 5 in this embodiment is a closed cavity, specifically a cylindrical closed cavity, and its top surface is provided with a movable avoidance hole 54 for the top of the anchor 52 to pass through. A space for the anchor 52 to move or rotate in all directions is reserved between the movable avoidance hole 54 and the anchor 52. For example, when the movable avoidance hole 54 is a circular hole and the anchor 52 is a cylindrical rod structure such as a bolt or a rock bolt, the outer diameter of the anchor 52 is smaller than the inner diameter of the movable avoidance hole 54. In actual operation, the movable avoidance hole 54 can also be a polygonal hole or other irregular holes, as long as it can meet the displacement requirements of the anchor 52.

[0058] The movement or rotation of the anchor 52 is based on a three-dimensional space, which can be a three-dimensional space with the transverse direction of the bridge, the longitudinal direction of the bridge, and the vertical direction of the bridge as the coordinate system.

[0059] Except for the structural arrangement of the above cavity structure 51 being different from that of the first embodiment, the bridge widening expansion device 100 in this embodiment adopts the setting method of the first embodiment, which will not be elaborated here.

[0060] Embodiment Three

[0061] A bridge widening expansion device 100 in this embodiment adopts a damper 5 different from that of the first embodiment. As Figure 5 shown in the figure, the cavity structure 51 of the damper 5 in this embodiment is a semi-closed cavity, specifically a cubic open cavity, and its top is directly open for the anchor 52 to pass through, and there is enough space for the anchor 52 to move or rotate in all directions.

[0062] The movement or rotation of the anchor 52 is based on a three-dimensional space, which can be a three-dimensional space with the transverse direction of the bridge, the longitudinal direction of the bridge, and the vertical direction of the bridge as the coordinate system.

[0063] Except for the structural arrangement of the above cavity structure 51 being different from that of the first embodiment, the bridge widening expansion device 100 in this embodiment adopts the setting method of the first embodiment, which will not be elaborated here.

[0064] Embodiment Four

[0065] A bridge widening expansion device 100 in this embodiment adopts a damper 5 different from that of the first embodiment. As Figure 6 shown in the figure, the cavity structure 51 of the damper 5 in this embodiment is a semi-closed cavity, specifically a rectangular parallelepiped open cavity, and its top is one end in the length direction of the rectangular parallelepiped open cavity, and this end is directly open for the anchor 52 to pass through, and there is enough space for the anchor 52 to move or rotate in all directions.

[0066] The movement or rotation of the anchor 52 is based on a three-dimensional space, which can be a three-dimensional space with the transverse direction of the bridge, the longitudinal direction of the bridge, and the vertical direction of the bridge as the coordinate system.

[0067] Except for the structural arrangement of the cavity structure 51 of the bridge widening expansion device 100 in this embodiment being different from that in the first embodiment, the other settings are the same as those in the first embodiment and will not be elaborated here.

[0068] Embodiment Five

[0069] A bridge widening expansion device 100 in this embodiment adopts a damper 5 different from that in the first embodiment. As Figure 7 shown, the cavity structure 51 of the damper 5 in this embodiment is a closed cavity, specifically a cuboid closed cavity, which can be placed vertically or horizontally. An activity avoidance hole 54 is provided on the top end surface for the top of the anchor 52 to pass through. A space for the anchor 52 to move or rotate in all directions is reserved between the activity avoidance hole 54 and the anchor 52. The activity avoidance hole 54 can be a circular hole, a long strip hole or other irregular holes, as long as it can meet the displacement requirements of the anchor 52.

[0070] The movement or rotation of the anchor 52 is based on a three-dimensional space, which can be a three-dimensional space with the transverse direction of the bridge, the longitudinal direction of the bridge and the vertical direction of the bridge as the coordinate system.

[0071] Except for the structural arrangement of the cavity structure 51 of the bridge widening expansion device 100 in this embodiment being different from that in the first embodiment, the other settings are the same as those in the first embodiment and will not be elaborated here.

[0072] Embodiment Six

[0073] This embodiment provides a bridge, including an existing bridge 2 and a new bridge 1 for widening arranged close to the existing bridge 2. There is a gap 3 between the new bridge 1 and the existing bridge 2. The bridge widening expansion device 100 disclosed in any one of the first to fifth embodiments is arranged at the gap 3. The bridge widening expansion device 100 connects the new bridge 1 and the existing bridge 2, not only realizing the effective cross-gap connection between the new bridge 1 and the existing bridge 2, but also being able to effectively adapt to the uneven settlement of the beam bodies on both the new and old sides, as well as the height difference inconsistency and angular change generated under the action of concrete creep, temperature, wind force and load. It can always keep the connection surface of the beam bodies on both the new and old sides flat and will not cause vehicle jumping.

[0074] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention, and any reference signs in the claims should not be regarded as limiting the claims involved.

[0075] Specific examples are used in the present invention to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. An expansion device for bridge widening, characterized in that, Comprising: A cover plate, which is used to be arranged across the gap between the new bridge and the old bridge to achieve a smooth transition between the new bridge and the old bridge; A damper, which includes a cavity structure, an anchor and an elastoplastic filler. The cavity structure is used to be fixed at the flange position of the beam body of the new bridge or the old bridge; the elastoplastic filler is filled in the cavity structure. The top of the anchor is connected to the end of the cover plate, and the bottom of the anchor is movably embedded in the elastoplastic filler; a protrusion is arranged on the anchor, and the protrusion protrudes towards the outer peripheral direction of the anchor and is embedded in the elastoplastic filler. The elastoplastic filler is a strain rate sensitive material, and the anchor can move or rotate in a three-dimensional space with the transverse direction of the bridge, the longitudinal direction of the bridge and the vertical direction of the bridge as the coordinate system; a plurality of L-shaped supports are arranged at the bottom end of the cavity structure, and the cavity structure is fixed at the flange position of the beam body of the new bridge or the old bridge through the supports, and after the supports are fixed to the flange position of the beam body of the new bridge or the old bridge, concrete pouring is carried out; both ends of the cover plate are respectively connected to the flange position of the beam body of the new bridge and the flange position of the beam body of the old bridge through the damper.

2. The expansion device for bridge widening according to claim 1, characterized in that, A plurality of the cover plates are provided, and the plurality of cover plates are arranged in sequence along the extension direction of the gap.

3. The expansion device for bridge widening according to claim 1, characterized in that, The cavity structure is a cylindrical cavity or a prismatic cavity; the cavity structure is filled with the elastoplastic filler, or a part of the space in the cavity structure is filled with the elastoplastic filler.

4. The expansion device for bridge widening according to claim 1, characterized in that, The cavity structure is a semi-closed cavity with an open top, and the top of the anchor extends out through the open top of the semi-closed cavity to be connected to the end of the cover plate.

5. The expansion device for bridge widening according to claim 1, characterized in that, The cavity structure is a closed cavity, and a movable avoidance hole for the top of the anchor to pass through is opened at the top of the closed cavity.

6. The expansion device for bridge widening according to claim 1, characterized in that, The anchor is a bolt, a screw rod, an anchor bar, a square steel or a steel plate; the protrusion is welded, thread-connected, riveted or integrally formed with the anchor, and the protrusion is arranged at the bottom of the anchor or near the bottom of the anchor.

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