A seamless expansion device for bridges

Abstract

The present invention belongs to the technical field of auxiliary functional components of bridges, and discloses a seamless expansion device for bridges. The present invention comprises two bridge components, both upper ends of the two bridge components are provided with asphalt concrete surface layers, and an elastic-plastic filling material is provided between the two asphalt concrete surface layers; a fixing part is embedded in the elastic-plastic filling material, and a movable part is embedded between the two fixing parts; a plurality of U-shaped connecting parts are provided between the movable parts and the fixing parts on both sides; and a reinforcing rib assembly is provided at the lower end of the fixing part. The present invention has the characteristics of orthogonality, and has a smaller deformation stiffness and a larger deformation capacity in the direction along the bridge to adapt to the deformation of the upper structure of the bridge caused by temperature changes, and at the same time has a larger stiffness in the vertical direction to withstand the gravity and impact of vehicle loads, which solves the problems of easy damage, difficult maintenance and uneven driving of traditional expansion joints.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge accessory functional components, and particularly relates to a seamless bridge expansion device. Background Art

[0002] The upper structure of a bridge will undergo longitudinal expansion and contraction deformation along the bridge due to temperature changes, shrinkage, and creep of concrete. When this expansion and contraction deformation is restricted, it will lead to damage to the bridge structure, cracking and arching of the bridge deck and road surface. The traditional and currently common practice is to install an expansion device with a deformation joint (commonly known as an expansion joint) between the beam bodies and between the beam body and the abutment to accommodate this expansion and contraction deformation.

[0003] Traditional expansion joints have the following disadvantages: The existence of the expansion joint makes the bridge deck a discontinuous structure. When a vehicle passes through the expansion joint, it will experience impact, resulting in uneven driving, affecting driving comfort; the repeated impact when the vehicle passes through makes the expansion joint prone to loosening, deformation and damage, and the damage of the expansion joint further aggravates the vehicle impact, forming a vicious cycle. The vehicle impact also causes damage to the bridge itself, reducing the service life of the bridge, and even endangering driving safety in severe cases; moreover, the bridge expansion joint is exposed, and the accumulated dust and garbage over a long time will fill the gap of the expansion joint, resulting in the failure of the expansion joint. Therefore, the bridge expansion joint is "repaired repeatedly but damaged repeatedly", becoming one of the typical difficulties in bridge maintenance, not only requiring long-term maintenance but also being costly.

[0004] The fundamental reason for the defects of traditional bridge expansion joints is the discontinuous bridge deck structure. Therefore, developing a seamless expansion device to achieve a continuous bridge deck is one of the important ways to solve the defects of traditional expansion joints. The concept of "the best expansion joint is a jointless expansion joint" has promoted the development of bridge seamless technology. Starting from the late 1970s in the UK, a filled bridge seamless expansion device using highly elastic-plastic materials has been developed and applied. This filled seamless expansion device is to reserve a slot at the bridge expansion joint, and then fill the reserved slot with a hot-mixed mixture elastomer composed of a variety of polymer-modified asphalt, anti-aging agents, and aggregates, so as to achieve a continuous bridge deck and improve driving comfort. This technology was introduced into China in the 1990s and has been developed and applied to a certain extent. However, this elastomer-filled expansion device also has some obvious disadvantages. Since the elastomer itself has a relatively soft material and a small stiffness, it deforms greatly under the action of wheel loads, and the interface between the elastomer and the bridge deck pavement is prone to debonding, and the edge of the bridge deck pavement is damaged by gnawing. Therefore, the durability of this expansion joint device is poor, and its application has not been popularized. Summary of the Invention

[0005] In order to solve the above problems existing in the prior art, the purpose of the present invention is to provide a seamless bridge expansion device.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A seamless expansion device for a bridge comprises two bridge members arranged at intervals, wherein the upper ends of the two bridge members are both provided with asphalt concrete surface layers; the gap between the two bridge members is a beam joint, an elastic material-filled space is provided between the two asphalt concrete surface layers, and the width of the elastic material-filled space is greater than the width of the beam joint, and an elastic-plastic filling material is provided in the elastic material-filled space; fixing parts on both sides of the elastic-plastic filling material are pre-embedded in the elastic-plastic filling material, and a movable part is pre-embedded in the elastic-plastic filling material between the two fixing parts; a plurality of U-shaped connecting parts are provided between the movable parts and the fixing parts on both sides; a reinforcing rib assembly for strengthening the connectivity between the elastic-plastic filling material and the two bridge members is provided at the lower end of the fixing part.

[0008] It is further preferred that the two bridge components are both beams, or the two bridge components are respectively a beam and an abutment.

[0009] It is further preferred that the fixing part includes a first perforated steel top plate, a fixing part steel bottom plate and a plurality of anchor bars which are arranged in sequence from top to bottom, the fixing part steel bottom plate is arranged at the upper end of the bridge component, the anchor bars are buried in the bridge component, and the anchor bars are connected to the reinforcing bar assembly; the first perforated steel top plate and the fixing part steel bottom plate are connected by a first perforated steel web or a first short steel bar, and the first perforated steel web or the first short steel bar is connected to one end of the U-shaped connecting part.

[0010] It is further preferred that the reinforcement rib assembly includes embedded steel bars and transverse steel bars of the bridge component that are connected to each other, the embedded steel bars and transverse steel bars of the bridge component are both embedded in the bridge component, and the embedded steel bars and transverse steel bars of the bridge component are both connected to corresponding anchor bars.

[0011] It is further preferred that the movable part includes a second perforated steel top plate and a movable part steel bottom plate arranged below the second perforated steel top plate, the second perforated steel top plate and the movable part steel bottom plate are connected by a second perforated steel web or a second short steel bar, and the second perforated steel web or the second short steel bar is connected to the other end of the U-shaped connecting piece; the two ends of the movable part steel bottom plate are respectively arranged on two fixed part steel bottom plates.

[0012] More preferably, the beam gap below the steel bottom plate of the movable part is filled with foam.

[0013] It is further preferred that the first perforated steel top plate and the fixing steel bottom plate are connected via a first perforated steel web; the upper end surface layer of the fixing steel bottom plate is flush with the upper end surface of the bridge component.

[0014] It is further preferred that the first perforated steel top plate and the fixing steel bottom plate are connected by a first short steel bar.

[0015] More preferably, the first perforated steel roof plate is a steel bar, and a plurality of openings are evenly arranged on the first perforated steel roof plate.

[0016] The beneficial effects of the present invention are as follows:

[0017] The present invention is an orthotropic steel skeleton seamless expansion device for highway bridges. By connecting and setting fixing parts, moving parts and U-shaped connecting parts between the fixing parts and the moving parts, it has the characteristics of orthotropy. It has a small deformation stiffness and a large deformation capacity in the longitudinal direction of the bridge to adapt to the deformation of the upper structure of the bridge caused by temperature changes. At the same time, it has a large stiffness in the vertical direction to bear the gravity and impact of vehicle loads; the reinforcing rib assembly strengthens the connection between the asphalt concrete surface layer and the bridge components, effectively forming the layer structure into a whole, and further enhancing the overall anti-deformation ability, load-bearing ability and anti-impact ability. Replacing the traditional expansion joint with this orthotropic steel skeleton seamless expansion device will achieve seamless continuity of the bridge pavement and solve the problems of easy damage, difficult maintenance and uneven driving of traditional expansion joints. Description of the Drawings

[0018] Figure 1 is the sectional structure diagram of the seamless expansion device of the bridge of the present invention;

[0019] Figure 2 is the top view structure diagram of the seamless expansion device of the bridge of the present invention;

[0020] Figure 3 is the three-dimensional view when the first perforated steel web is used in the fixing part of the present invention;

[0021] Figure 4 is the side view when the first perforated steel web is connected to the U-shaped connecting part in the fixing part of the present invention;

[0022] Figure 5 is the three-dimensional view when the second perforated steel web is used in the moving part of the present invention;

[0023] Figure 6 is the three-dimensional view when the first short steel bar is used in the fixing part of the invention;

[0024] Figure 7 is the side view when the first short steel bar is connected to the U-shaped connecting part in the fixing part of the present invention;

[0025] Figure 8 is the three-dimensional view when the second short steel bar is used in the moving part of the present invention.

[0026] In the figure: 1 - bridge component; 2 - asphalt concrete surface course; 3 - elastoplastic filling material; 4 - fixing piece; 41 - first perforated steel top plate; 42 - fixing piece steel bottom plate; 43 - anchoring bar; 44 - first perforated steel web; 45 - first short steel bar; 5 - movable piece; 51 - second perforated steel top plate; 52 - movable piece steel bottom plate; 53 - second perforated steel web; 54 - second short steel bar; 6 - U-shaped connecting piece; 7 - stiffening rib assembly; 71 - bridge component embedded steel bar; 72 - transverse bridge direction steel bar; 8 - foam. Detailed implementation manners

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or in the prior art, the following will briefly introduce the present invention in combination with the accompanying drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the accompanying drawings is only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained according to these accompanying drawings.

[0028] The following will refer to the accompanying drawings and describe in detail the technical solutions provided by the present invention through embodiment manners. It should be noted here that the description of these embodiment manners is used to help understand the present invention, but does not constitute a limitation to the present invention.

[0029] In some examples, since some implementation manners belong to the prior art or conventional techniques, they are not described or not described in detail.

[0030] In addition, the technical features described herein, or the steps in all the methods or processes disclosed, except for the mutually exclusive features and / or steps, can also be combined in any suitable manner in one or more embodiments. For those skilled in the art, it is easy to understand that the steps or the operation sequence of the methods related to the embodiments provided herein can also be changed. Any sequence in the accompanying drawings and the embodiments is only for illustrative purposes and does not imply a requirement to follow a certain sequence, unless it is clearly stated that a certain sequence is required.

[0031] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the described objects and do not have any sequential or technical meanings. And the "connection" and "coupling" mentioned in this application, under reasonable circumstances (without self-contradiction), both include direct and indirect connection (coupling).

[0032] Embodiment 1:

[0033] As Figure 1-8As shown, this embodiment provides a seamless expansion device for a bridge, comprising two bridge components 1 arranged at intervals, and an asphalt concrete surface layer 2 is provided at the upper ends of the two bridge components 1; the gap between the two bridge components 1 is a beam joint, and an elastic material-filled space is provided between the two asphalt concrete surface layers 2, and the width of the elastic material-filled space is greater than the width of the beam joint, and an elastic-plastic filling material 3 is provided in the elastic material-filled space; the elastic-plastic filling material 3 is pre-embedded with fixing parts 4 located on both sides thereof, and a movable part 5 is pre-embedded in the elastic-plastic filling material 3 between the two fixing parts 4; a plurality of U-shaped connecting parts 6 are provided between the movable part 5 and the fixing parts 4 on both sides; a reinforcing rib assembly 7 for strengthening the connectivity between the elastic-plastic filling material 3 and the two bridge components 1 is provided at the lower end of the fixing part 4. The movable part 5 and the fixed part 4 are welded by a U-shaped connector 6 to form an orthotropic steel skeleton to adapt to a larger expansion and contraction amount. The orthotropic steel skeleton and the elastic-plastic filling material 3 can be made of existing materials. For example, the elastic-plastic filling material 3 used can be an existing high-elastic asphalt concrete material such as epoxy asphalt mixture or rubber asphalt mixture, without specific limitation. It should be further explained that the two bridge components 1 are both beams, or the two bridge components 1 are respectively a beam and an abutment.

[0034] The present invention is an orthotropic steel frame seamless expansion device for highway bridges. By connecting and setting a fixed part 4, a movable part 5 and a U-shaped connecting part 6 between the fixed part 4 and the movable part 5, it has the characteristics of orthotropic anisotropy, has a smaller deformation stiffness and a larger deformation capacity in the direction along the bridge, so as to adapt to the deformation of the bridge superstructure caused by temperature changes, and has a larger vertical stiffness to withstand the gravity and impact of vehicle loads; the reinforcing rib assembly 7 strengthens the connectivity between the asphalt concrete surface layer 2 and the bridge component 1, effectively forming the layer structure as a whole, and further strengthening the overall deformation resistance, load-bearing capacity and impact resistance. Replacing the traditional expansion joint with this orthotropic steel frame seamless expansion device will achieve seamless continuity of the bridge pavement, and solve the problems of easy damage, difficult maintenance and uneven driving of traditional expansion joints. At the same time, the present invention also has the following characteristics:

[0035] (1) By installing this seamless expansion joint with an appropriate length along the bridge to replace the conventional expansion joint, the entire bridge can be made seamless, the driving stability and comfort can be improved, the bridge damage caused by the impact of vehicles on conventional expansion joints can be avoided, and the maintenance workload can be greatly reduced.

[0036] (2) The orthogonal anisotropic steel skeleton and the elastic-plastic filling material 3 formed by the present invention are combined to form a composite structure, which improves the overall vertical stiffness of the expansion joint and matches the vertical stiffness of the bridge deck. Compared with conventional filled expansion joints, it can avoid the gnawing of the reserved groove, cracking and other defects caused by the large deformation difference when the wheels run over the expansion joint.

[0037] (3) Due to the support and restraint of the orthotropic steel skeleton, the depression and protrusion of the elastoplastic filling material 3 can also be avoided.

[0038] (4) It has good deformation ability in the longitudinal direction of the bridge to adapt to the slow expansion and contraction deformation of the beam body due to shrinkage, creep and temperature changes. However, it also has a certain longitudinal stiffness of the bridge, which can effectively resist the horizontal displacement of the upper structure of the bridge under the braking force, and can also reduce the deviation of the pier, which is beneficial to the force of the pier.

[0039] (5) Since the displacement of the beam body under the braking force is limited, there is no need to consider the additional expansion amount due to installation errors as in the conventional expansion joint. Therefore, for the same joint length, the required expansion amount is smaller.

[0040] (6) Since the orthotropic steel skeleton of this expansion device effectively improves its vertical stiffness, a larger width and height of the elastoplastic filling material 3 can be adopted. Compared with the conventional filled expansion joint, an expansion device with a larger expansion amount can be manufactured. When a larger expansion amount is required, it can be achieved by increasing the number of movable parts.

[0041] (7) This seamless expansion device has good deformation ability and reasonable stiffness in the longitudinal direction of the bridge. When subjected to the horizontal seismic action, it can play a good role in buffering and restricting the displacement of the beam body; at the same time, the combined structure composed of the orthotropic steel skeleton and the elastoplastic filling material 3 has good viscoelastic properties and can play a role in seismic energy dissipation. Therefore, adopting this seamless expansion device can significantly improve the seismic performance of the bridge.

[0042] (8) The construction speed is fast. Generally, the installation and pouring of one expansion device can be completed in a few hours, and the traffic can be opened 24 hours after completion.

[0043] (9) It is convenient for maintenance and has a small workload. This seamless expansion device has good durability and can reduce the maintenance workload; even if there are diseases, the maintenance is very convenient. If there are cracks, the hot-melt elastoplastic material can be used for sealing. If there is wear and potholes, the surface layer can be remade by hot melting. In addition, this expansion device has good vertical shear deformation ability, which is also very convenient for the operation of jacking and replacing the bearing. Under the condition of reasonably controlling the jacking amount, the expansion device will not be damaged.

[0044] (10) The cost of this seamless expansion device is about 50% higher than that of the ordinary expansion joint. However, considering from the perspective of performance and the life-cycle cost, it has good technical and economic benefits because it can improve durability, reduce the maintenance workload, and improve the bridge performance and driving conditions.

[0045] Example Two:

[0046] This embodiment is a further improvement based on Embodiment 1. The specific difference between this embodiment and Embodiment 1 is as follows:

[0047] In this embodiment, it should be further noted that, as Figure 3 , Figure 4 , Figure 6 and Figure 7 shown, the fixing member 4 includes a first perforated steel top plate 41, a fixing member steel bottom plate 42, and a plurality of anchor bars 43 arranged in sequence from top to bottom. The fixing member steel bottom plate 42 is disposed at the upper end of the bridge member 1, and the anchor bars 43 are embedded in the bridge member 1, and the anchor bars 43 are connected to the reinforcing bar assembly 7; the first perforated steel top plate 41 and the fixing member steel bottom plate 42 are connected by a first perforated steel web 44 or a first short reinforcing bar 45, and the first perforated steel web or the first short reinforcing bar is connected to one end of the U-shaped connecting member 6. Further, it should be noted that the first perforated steel top plate 41 is a steel strip, and a plurality of openings are uniformly arranged on the first perforated steel top plate 41. As Figure 3 or Figure 6 shown, the fixing member 4 is combined into an I-shaped structure to provide vertical stiffness support; the first perforated steel top plate 41 is preferably a narrow steel strip, with openings at a certain interval, so that the elastoplastic materials filled therein are interconnected to form a whole. There are two fixing members 4 in total, which are arranged on both sides of the expansion joint (i.e., the gap between two beam bodies), and the movable member 5 is arranged between the two fixing members 4. According to the required expansion amount, one or an odd number of movable members 5 can be provided. Between the adjacent movable member 5 and the fixing member 4, they are connected and erected by a horizontally arranged U-shaped connecting member 4. The U-shaped connecting member 4 is preferably made of reinforcing bars, so that the expansion joint has suitable stiffness and deformation ability in the longitudinal direction of the bridge. By using the first perforated steel web 44, the constraint on the fixing member 4 and the elastoplastic filling material 3 can be strengthened, and the delamination between the elastoplastic filling material 3 and the side surface of the asphalt concrete surface layer 2 can be avoided. The function of using the first short reinforcing bar 45 is the same as that of using the first perforated steel web 44, and the structure of using the first short reinforcing bar 45 is simpler, the production is more convenient, and the cost is lower. From the actual use situation, the same effect as that of using the first perforated steel web 44 has been achieved.

[0048] Embodiment 3:

[0049] This embodiment is a further improvement based on Embodiment 2. The specific difference between this embodiment and Embodiment 2 is as follows:

[0050] In this embodiment, it should be further noted that the stiffener assembly 7 includes the pre-embedded steel bars 71 of the bridge member and the transverse bridge bars 72 which are connected to each other. The pre-embedded steel bars 71 of the bridge member and the transverse bridge bars 72 are both pre-embedded in the bridge member 1, and the pre-embedded steel bars 71 of the bridge member and the transverse bridge bars 72 are both connected to the corresponding anchor bars 43. The pre-embedded steel bars 71 of the bridge member and the transverse bridge bars 72 are both connected to the bridge member 1 and are simultaneously connected to the anchor bars 43, which can well strengthen the connection between the elastoplastic filling material 3 and the bridge member 1, effectively form the layer structure into a whole, and avoid the damage of the elastoplastic filling material 3 during long-term use.

[0051] Embodiment 4:

[0052] This embodiment is a further improvement based on Embodiment 2 or Embodiment 3. The specific difference between this embodiment and Embodiment 2 or Embodiment 3 is:

[0053] In this embodiment, it should be further noted that as Figure 5 and Figure 8 shown, the movable member 5 includes the second perforated steel top plate 51 and the movable member steel bottom plate 52 arranged below the second perforated steel top plate 51. The second perforated steel top plate 51 and the movable member steel bottom plate 52 are connected by the second perforated steel web 53 or the second short steel bar 54, and the second perforated steel web 53 or the second short steel bar 54 is connected to the other end of the U-shaped connecting member 6; both ends of the movable member steel bottom plate 52 are respectively arranged on the two fixed member steel bottom plates 42. Generally, all parts of the movable member 5 are connected by welding, and the stability is good. By using the second perforated steel web 53, the constraint on the elastoplastic filling material 3 located between the movable member 5 and the elastoplastic filling material 3 can be strengthened, and the delamination between the elastoplastic filling material 3 and the side surface of the asphalt concrete surface layer 2 can be avoided. The function of using the second short steel bar 54 is the same as that of using the second perforated steel web 53, and the structure of using the second short steel bar 54 is simpler, the production is more convenient, and the cost is lower. From the actual use situation, the same effect as that of using the second perforated steel web 53 has been achieved.

[0054] Embodiment 5:

[0055] This embodiment is a further improvement based on Embodiment 4. The specific difference between this embodiment and Embodiment 4 is:

[0056] In this embodiment, it should be further noted that the beam gap below the movable member steel bottom plate 52 is filled with foam 8. The foam 8 can play a certain buffering role and make the protection effect better.

[0057] Embodiment 6:

[0058] This embodiment is a further improvement based on any one of Embodiments 2 to 5. The specific difference between this embodiment and any one of Embodiments 2 to 5 is as follows:

[0059] In this embodiment, it should be further noted that the first perforated steel top plate 41 and the fixing part steel bottom plate 42 are connected by a first perforated steel web; the upper surface layer of the fixing part steel bottom plate 42 is flush with the upper surface of the bridge member 1. The appropriate distance in this embodiment can ensure better stability and play a good protective role.

[0060] Embodiment 7:

[0061] This embodiment is a further improvement based on any one of Embodiments 2 to 6. The specific difference between this embodiment and any one of Embodiments 2 to 6 is as follows:

[0062] In this embodiment, it should be further noted that the first perforated steel top plate 41 and the fixing part steel bottom plate 42 are connected by a first short steel bar. The appropriate distance in this embodiment can ensure better stability and play a good protective role. At the same time, the distance between the two ends of the fixing part 4 and the side surface of the notch is small, and the fixing part 4 has a good constraining effect on this small part of the elastoplastic filler between it and the side surface of the notch, so as to effectively prevent the elastoplastic filler from debonding from the side surface of the asphalt layer at the notch and cause edge chipping damage to the bridge deck.

[0063] The present invention is not limited to the above optional embodiments. Any person can obtain other various forms of products under the inspiration of the present invention. However, no matter what changes are made in its shape or structure, as long as the technical solutions fall within the scope defined by the claims of the present invention, they all fall within the protection scope of the present invention.

Claims

1. A seamless expansion joint for bridges, characterized in that: The invention comprises two bridge components (1) arranged at intervals, wherein the upper ends of the two bridge components (1) are both provided with asphalt concrete surface layers (2); the gap between the two bridge components (1) is a beam joint, an elastic material filling space is provided between the two asphalt concrete surface layers (2), and the width of the elastic material filling space is greater than the width of the beam joint, and an elastic-plastic filling material (3) is provided in the elastic-plastic filling material (3); fixing members (4) located on both sides thereof are pre-embedded in the elastic-plastic filling material (3), and a movable member (5) is pre-embedded in the elastic-plastic filling material (3) between the two fixing members (4); a plurality of U-shaped connecting members (6) are provided between the movable member (5) and the fixing members (4) on both sides; and a reinforcing rib assembly (7) for reinforcing the connection between the elastic-plastic filling material (3) and the two bridge components (1) is provided at the lower end of the fixing member (4); The two bridge components (1) are both beams, or the two bridge components (1) are respectively a beam and an abutment; the fixing member (4) comprises a first perforated steel top plate (41), a fixing member steel bottom plate (42) and a plurality of anchor bars (43) arranged in sequence from top to bottom, the fixing member steel bottom plate (42) being arranged at the upper end of the bridge component (1), the anchor bars (43) being buried in the bridge component (1), and the anchor bars (43) being connected to the reinforcing bar assembly (7); the first perforated steel top plate (41) and the fixing member steel bottom plate (42) are connected via a first perforated steel web (44) or a first short steel bar (45). The movable member (5) comprises a second perforated steel top plate (51) and a movable member steel bottom plate (52) arranged below the second perforated steel top plate (51); the second perforated steel top plate (51) and the movable member steel bottom plate (52) are connected via a second perforated steel web plate (53) or a second short steel bar (54); the second perforated steel web plate (53) or the second short steel bar (54) is connected to the other end of the U-shaped connector (6); the two ends of the movable member steel bottom plate (52) are respectively arranged on two fixed member steel bottom plates (42).

2. The seamless expansion device for bridge according to claim 1, characterized in that: The reinforcing bar assembly (7) comprises pre-embedded steel bars (71) and transverse steel bars (72) of the bridge component which are connected to each other. The pre-embedded steel bars (71) and transverse steel bars (72) of the bridge component are both pre-embedded in the bridge component (1), and the pre-embedded steel bars (71) and transverse steel bars (72) of the bridge component are both connected to corresponding anchor bars (43).

3. A seamless expansion device for bridges according to claim 1 or 2, characterized in that: The beam gap below the movable steel bottom plate (52) is filled with foam (8).

4. The seamless expansion device for bridge according to claim 1, characterized in that: The first perforated steel top plate (41) and the fixing steel bottom plate (42) are connected via a first perforated steel web (44); the upper end surface layer of the fixing steel bottom plate (42) is flush with the upper end surface of the bridge component (1).

5. The seamless expansion device for bridges according to claim 1, characterized in that: The first perforated steel top plate (41) and the fixing steel bottom plate (42) are connected via a first short steel bar (45).

6. The seamless expansion device for a bridge according to claim 1, wherein: The first perforated steel top plate (41) is a steel bar, and a plurality of openings are evenly arranged on the first perforated steel top plate (41).

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