A beam joint expansion device for a movable bridge

Abstract

An expansion joint device for an opening bridge comprises an opening-side device and a fixed-side device interlocked in a comb-like pattern above the bridge beam joint. The opening-side device moves along with the opening bridge box girder, with its front part extending over the fixed bridge box girder. When the bridge is closed, it rests on a baffle welded to the fixed bridge box girder, achieving waterproofing through the baffle. This invention, as an expansion joint device above the beam joint of an opening bridge, is paved at the same level as the road surface. It not only adapts to the expansion and contraction of the bridge but also has a simple and durable structure, further simplifying the construction process, shortening valuable construction time, and saving more than 30% of materials compared to traditional expansion joint devices. It also provides waterproofing and prevents stones and wheels from getting stuck.

Description

Technical Field

[0001] This invention relates to bridge construction, specifically to a bridge beam joint expansion joint device. Background Technology

[0002] Bridge beam joints are waterproof and adaptable expansion joints installed at the bridge deck during construction to accommodate expansion and contraction. They are designed to accommodate changes in longitudinal and lateral dimensions. Opening bridges typically open one side of the bridge deck via a pivot point, allowing objects taller than the bridge structure to temporarily pass through the middle of the bridge when open. When the opening side of the opening bridge is lowered to close with the fixed side, a beam joint is left at the joint to accommodate expansion and contraction, preventing stress from causing a decrease in the bridge's load-bearing capacity or collapse.

[0003] Bridge expansion joint devices need to ensure a smooth surface at the expansion joint, preventing stones and wheels from getting stuck, while also aiming for a long service life and simple maintenance. Existing bridge expansion joint devices can meet the basic requirements for adapting to bridge expansion and contraction, but their effectiveness in dealing with stones and wheels getting stuck is unsatisfactory. Maurer expansion joint devices have significant problems with waterproofing and preventing stones from getting stuck. Even with steel springs, the comb-type expansion joint has a relatively complex structure, and years of practical experience have shown that for medium and large bridges, vertical relative movement on both sides of the expansion joint can cause bridge deck arching or damage to connecting components.

[0004] For opening bridges where one side of the bridge deck rotates and lifts when needed, higher requirements are placed on the bridge deck expansion joints on the moving side. The expansion joints on the moving side are fixed to the steel box girder, requiring the structure to be lightweight, stable, and reliable, while also meeting the requirements for waterproofing the beam joints and preventing stones from getting stuck. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a beam joint expansion device for an openable bridge. The device is required to have a simple, lightweight and reliable overall structure, a flat and beautiful bridge surface, and to meet the functional requirements and paving requirements of an openable bridge. When the bridge body on both sides deforms, it is not affected by the vertical relative displacement of the bridge body on both sides of the expansion joint. At the same time, it plays the role of preventing jamming and waterproofing at the expansion joint.

[0006] In the following description, "horizontal" refers to the direction parallel to the bridge joint, "longitudinal" refers to the direction perpendicular to the bridge joint in the horizontal plane, "front" refers to the direction parallel to the bridge surface and perpendicular to the bridge joint, and "rear" refers to the direction parallel to the bridge surface and perpendicular to the bridge joint. Therefore, the front of the fixed side and the front of the movable side are relative.

[0007] The aforementioned expansion joint device for the opening bridge has an opening bridge box girder and a fixed bridge box girder on both sides of the bridge beam joint, characterized in that: the expansion joint device is composed of an opening side device and a fixed side device assembled above the bridge beam joint;

[0008] The opening side device is fixed to the opening bridge box girder. The front part of the opening side device cantilevered in front of the opening bridge box girder and partially overlapped vertically with the fixed bridge box girder. The opening side device consists only of a main comb tooth web plate, a sealing plate, and a comb tooth main plate stacked from bottom to top. The lower and upper sides of the main comb tooth web plate are welded to the opening bridge box girder and the comb tooth main plate, respectively. The comb tooth main plate is provided with multiple main tooth plates whose tail ends are connected as one piece and whose front ends extend vertically toward the bridge beam joint. The main comb tooth web plate is a number of independent elongated plates, each covered by a main tooth plate. An upper sealing plate is welded between adjacent main tooth plates parallel to the surface of the comb tooth main plate, and the upper sealing plate extends to the opposite side of the bridge beam joint.

[0009] The fixed-side device is installed on the fixed bridge box girder on the fixed side of the bridge. It consists of a support plate, a secondary comb-tooth web, and a secondary comb-tooth plate from bottom to top. The support plate includes a side beam and a positioning baffle. The front and rear parts of the lower side of the secondary comb-tooth web are respectively welded with a transversely continuous side beam and a positioning baffle. The lower ends of the side beam and the positioning baffle are welded and fixed to the fixed bridge box girder. The upper part of the secondary comb-tooth web is welded to the secondary comb-tooth plate. The secondary comb-tooth plate has multiple secondary tooth plates with their tail ends connected as one piece and their front ends extending vertically towards the bridge beam joint. The secondary comb-tooth web consists of multiple independent elongated plates, each covered by a secondary tooth plate.

[0010] The secondary comb plate is at the same height as the upper surface of the main comb plate, and the main comb plate overlaps the secondary comb plate in a plane when in a horizontal state. The sealing plate refers to the upper sealing plate, or a combination of the upper sealing plate and the lower sealing plate.

[0011] As a further preferred embodiment, the sealing plate also includes a lower sealing plate, wherein the lower sealing plate is welded parallel to the surface of the main comb plate at the bottom or lower side between adjacent main comb web plates, and the lower sealing plate is located in front of the open bridge box girder near the bridge beam joint.

[0012] As a further preferred embodiment, when the lower sealing plate is in a horizontal state, a baffle is provided between the area covered by the lower sealing plate and the fixed bridge box girder. The baffle has a support part that is welded and fixed to the fixed bridge box girder and a contact part that is close to the lower sealing plate. An elastic buffer plate is provided between the lower sealing plate and the contact part and is fixedly connected to the contact part. When the lower sealing plate is in a horizontal state, it is in contact with the buffer plate.

[0013] Typically, the buffer plate is a rubber plate.

[0014] As an example, the contact part and the support part of the baffle are respectively a horizontal plate and a vertical plate that are bent vertically. The lower end of the vertical plate is welded and fixed to the fixed bridge box girder, and a buffer plate is fixedly connected to the upper part of the horizontal plate.

[0015] As an example, the front end of the upper sealing plate is bent vertically downward in front of the lower sealing plate and suspended above the fixed bridge box girder.

[0016] As an example, a stiffening plate is provided between the side beam and the positioning baffle, parallel to the positioning baffle. The stiffening plate is divided into multiple sections and welded between adjacent secondary comb teeth web plates, with the lower end welded to the fixed bridge box girder.

[0017] Preferably, the space between the side beam and the positioning baffle is filled with mortar.

[0018] This invention, as an expansion joint above the beam joint of an openable bridge, is paved at the same level as the road surface. It can not only adapt to the expansion and contraction of the bridge, but also has a simple and durable structure. The construction process is further simplified, shortening valuable construction time. It saves more than 30% of materials compared with traditional expansion joints, and also has the functions of waterproofing and preventing stones and wheels from getting stuck.

[0019] The opening-side device is integrated with the movable opening-side box girder. The comb-tooth main plate and the main comb-tooth web plate are overlapped and welded to achieve the required thickness for the road surface rigidity and deflection resistance on the opening side, covering the bridge girder joints. This simplifies the structure of the opening-side device, eliminating the need for additional waterproofing and anti-stone-jamming devices. A sealing plate is used to prevent stone jamming and smooth the road surface. Waterproofing of the girder joints is achieved by a baffle plate below the integrated opening-side device, which not only simplifies the waterproofing structure but also reduces the weight of the opening-side device. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the planar structure of one embodiment of the present invention.

[0021] Figure 2 yes Figure 1 Schematic diagram of the AA section structure.

[0022] Figure 3 This is a schematic diagram of the planar structure of an embodiment of the comb-tooth motherboard.

[0023] Figure 4 This is a schematic diagram of the planar structure of an embodiment of the comb tooth secondary plate.

[0024] Figure 5 This is a schematic diagram of the longitudinal elevation structure of an embodiment of the upper sealing plate.

[0025] In the diagram: 1-Bridge deck pavement, 2-Main comb tooth plate, 3-Main comb tooth web, 4-Upper sealing plate, 5-Lower sealing plate, 6-Buffer plate, 7-Opening bridge box girder, 8-Baffle plate, 9-Bridge beam joint, 10-Fixed bridge box girder, 11-Secondary comb tooth plate, 12-Secondary comb tooth web, 13-Side beam, 14-Stiffening plate, 15-Positioning baffle plate, 16-Main tooth plate, 17-Secondary tooth plate, 18-Contact part, 19-Support part. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and embodiments: The device in its overall installed state, as shown in the accompanying drawings... Figure 1 ,2 As shown in the embodiment, the bridge beam joint of the opening bridge has opening bridge box girders 7 and fixed bridge box girders 10 respectively on both sides. The beam joint expansion device is laid on top of the opening bridge box girders 7 and fixed bridge box girders 10, and is only composed of opening side device and fixed side device spliced ​​on top of the bridge beam joint. Since the opening side device is the movable side when the bridge is opened, and is fixed as one piece with the opening bridge box girder 7, the opening side device is required to be set independently from the fixed side device, and the opening side device must have a simple and stable structure while meeting the requirements of rigid bearing of the bridge deck.

[0027] The opening side device is installed on the opening bridge box girder 7 on the opening side of the bridge, and its surface is flush with the bridge deck pavement. The front part of the opening side device cantilevered in front of the opening bridge box girder 7. In the closed state, the opening side device part overlaps the fixed bridge box girder 10 in the vertical direction.

[0028] To achieve the anti-reflection rigidity of the expansion joint under pressure, the main body of the opening side device consists of a main comb-tooth web plate 3 and a comb-tooth main plate 2 stacked sequentially from bottom to top. The lower side of the main comb-tooth web plate 3 is welded to the opening bridge box girder 7, and the upper side of the main comb-tooth web plate 3 is welded to the bottom surface of the comb-tooth main plate 2. Different beam joint spans require corresponding thickness requirements, which can be achieved through conventional calculations. Since the main comb-tooth web plate 3 and the comb-tooth main plate 2 use the same material and have the same coefficient of thermal expansion, there will be no internal stress caused by relative positional changes. Figure 1 As shown, the main comb plate 2 has multiple main tooth plates 16 with their tail ends connected as one piece and extending vertically towards the bridge beam joint 9. The main tooth plates 16 are part of the main comb plate 2 and consist of multiple parallel pieces, with gaps between each main tooth plate 16 for the secondary tooth plates 17 extending in from opposite sides. The main comb web plate 3 consists of multiple independent elongated plates, each covered by a main tooth plate 16. Typically, a main comb web plate 3 is welded below each main tooth plate 16. The main comb web plate 3 and the main comb plate 2 are erected across the bridge beam joint 9 above the fixed side box girder.

[0029] The gaps between adjacent main tooth plates 16 create vertical pits and pores. Therefore, an upper sealing plate 4 is welded parallel to the surface of the comb main plate 2 between adjacent main tooth plates 16. The height difference between the upper surface of the upper sealing plate 4 and the upper surface of the main tooth plate 16 is no more than 1 cm. The upper sealing plate 4 extends forward to the opposite side of the bridge beam joint 9, and the upper sealing plate 4 and the comb main plate 2 completely cover the bridge beam joint 9. This eliminates the phenomenon of stones getting stuck on the surface and wheels getting stuck, as well as water leakage through the beam joint above the bridge deck. Stone getting stuck can cause changes in bridge deck stress and the risk of stones flying out and injuring people after being pressed. Since the sealing plate is made of thin sheet metal, it has little impact on the weight of the opening side device. Sufficient gaps are still left in front of the upper sealing plate 4 to accommodate the secondary tooth plate 17 on the opposite side.

[0030] To prevent stones from getting stuck between the main tooth plates 16 below the upper sealing plate and to keep the lower surface of the main comb tooth web 3 flat, a lower sealing plate 5 is welded to the bottom of the main comb tooth web 3 between adjacent main comb tooth web plates 3 or to the lower side of the main comb tooth web 3. The lower sealing plate 5 is parallel to the surface of the main comb tooth plate 2. Figure 2 As shown, the lower sealing plate 5 only needs to be installed on the bottom of the main comb tooth web plate 3 exposed in the openable bridge box girder 7.

[0031] When the lower sealing plate 5 is in a horizontal state, the front part of the lower sealing plate 5 extends beyond the bridge beam joint 9, and the lower part covered in the vertical direction overlaps with the fixed bridge box girder 10 at intervals. A baffle 8 is provided between the lower sealing plate 5 and the fixed bridge box girder 10 and is welded and fixed to the fixed bridge box girder 10.

[0032] like Figure 2 As shown, the lower end of the baffle is a support part 19 welded and fixed to the fixed bridge box girder 10, and the upper end is a contact part 18 close to the lower sealing plate 5. Figure 2 In this embodiment, the baffle 8 is an L-shape formed by vertically bending a horizontal plate and a vertical plate. The vertical plate is perpendicular to the main toothed plate 16, and its lower end is welded and fixed to the fixed bridge box girder 10. An elastic buffer plate 6 is fixedly connected above the horizontal plate, and the lower sealing plate 5 is in contact with the buffer plate 6 when in a horizontal state. Typically, the buffer plate 6 is a wear-resistant and highly elastic rubber plate. When the bridge is in the open state on the open side, the lower sealing plate 5 separates from the buffer plate 6.

[0033] The main function of the baffle is to block moving objects, mainly gravel and water, from behind the fixed bridge box girder 10, preventing them from falling through the beam joints and injuring personnel. Therefore, the forward extension of the lower sealing plate 5 needs to cross the baffle 8 of the fixed bridge box girder, extending at most to the front end of the main comb tooth web 3. However, with the support of the secondary comb tooth plate 11 in front, the front end of the main comb tooth web 3 does not need to extend forward to the front end of the main comb tooth plate 2.

[0034] In a further embodiment, the front end of the upper sealing plate 4 is bent vertically downwards and suspended above the fixed bridge box girder 10, closing the end opening of the space between adjacent main tooth plates 16. The position of the upper sealing plate 4 bending vertically downwards is in front of the lower sealing plate 5.

[0035] The fixed-side device is installed on the fixed bridge box girder 10, and secondary comb-tooth web plates 12 and secondary comb-tooth plates 11 are stacked sequentially from bottom to top. The upper surfaces of the secondary comb-tooth plates 11 and the main comb-tooth plates 2 are at the same height when the bridge is closed. The front part of the lower side of the secondary comb-tooth web plate 12 is welded to the fixed bridge box girder 10 through a side beam 13. A positioning baffle 15 is provided behind the side beam 13 and welded to the fixed bridge box girder 10. The upper side of the secondary comb-tooth web plate 12 is welded to the secondary comb-tooth plates 11. The secondary comb-tooth plates 11 are provided with multiple secondary tooth plates 17 whose tail ends are connected as one piece and whose front parts extend parallel to the direction of the bridge beam joint 9. The secondary tooth plates 17 are part of the secondary comb-tooth plates 11 and are provided with multiple parallel pieces.

[0036] Here, the front of the secondary comb plate 11 points towards the bridge beam joint 9. The secondary comb web 12 consists of multiple independent elongated plates, each covered by a secondary comb plate 17. The secondary comb web 12 is used to strengthen the load-bearing capacity and anti-reflection performance of the secondary comb plate 11. The front portion of the secondary comb plate 17 extends into the gap between the main comb plates 16.

[0037] The side beam 13 and the positioning baffle 15 are arranged vertically along their entire length. The upper and lower sides of the side beam 13 are welded to the secondary comb-tooth web plate 12 and the fixed bridge box girder 10, respectively. The lower side of the positioning baffle 15 is welded to the fixed bridge box girder 10, and the upper side is welded to the tail of the secondary comb plate 17. For bridges with large deck width and span, such as in embodiments where the distance between the side beam 13 and the positioning baffle 15 is greater than 300mm, stiffening plates 14 can be added parallel between the side beam 13 and the positioning baffle 15. The stiffening plates 14 are arranged in multiple segments, with the upper part extending into and welded between adjacent secondary comb-tooth web plates 12, and the lower two sides welded to the fixed bridge box girder 10, respectively.

[0038] Immediately behind the positioning baffle 15 and adjacent to the bridge deck pavement, mortar is filled in the space between the side beam 13 and the positioning baffle 15. The height of the mortar is equal to the upper edge of the side beam 13, that is, flush with the bottom surface of the secondary comb tooth web 12. The mortar runs horizontally through the space, with the side beam 13 acting as a limiting baffle for the mortar. The secondary comb tooth plate 11 rests entirely on the solidified mortar surface, and the mortar height serves as the limiting height for the inserted main comb tooth plate 2. During construction, the secondary comb tooth plate 11 needs to be welded as a whole to the fixed bridge box girder 10 first, and then mortar is poured between the side beam 13 and the positioning baffle 15 until it is flush with the upper edge of the side beam 13.

[0039] During the overall construction, the fixed side device and the movable side device are first prefabricated and welded in the factory or on site. Then, the fixed side device and the movable side device are welded and fixed to the fixed bridge box girder 7 and the movable bridge box girder 10 according to the planned position. The baffle 8 is welded and fixed to the fixed bridge box girder 7 according to the planned position. Then, mortar is poured between the side beam 13 and the positioning baffle 15 until it is flush with the upper edge of the side beam 13. After curing and hardening, the bridge deck paving can be completed. Therefore, the overall construction is fast, uses less material, and is stable in use.

[0040] Obviously, the embodiments described in this invention are merely some, not all, of the embodiments of this invention. The embodiments may be applied interchangeably and are not intended to limit the scope of this invention. Implementers may modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the protection scope of this invention. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this invention.

Claims

1. A beam joint expansion device for an opening bridge, wherein an opening bridge box girder (7) and a fixed bridge box girder (10) are respectively provided on both sides of the beam joint (9) of the opening bridge, characterized in that: The beam joint expansion joint device is composed of an opening side device and a fixed side device assembled above the bridge beam joint; The opening side device is installed on the opening bridge box girder (7) on the opening side of the bridge. The front part of the opening side device cantilevered in front of the opening bridge box girder (7) and partially overlapped vertically on the fixed bridge box girder (10). The opening side device consists only of the main comb tooth web plate (3), the sealing plate and the comb tooth main plate (2) stacked from bottom to top. The lower and upper sides of the main comb tooth web plate (3) are welded to the opening bridge box girder (7) and the comb tooth main plate (2) respectively. The comb tooth main plate (2) is provided with multiple main tooth plates (16) with their tail ends connected as one piece and their front parts extending vertically toward the bridge beam joint (9). The main comb tooth web plate (3) is a long plate that is independent and covered by the main tooth plate (16). The upper sealing plate (4) is welded parallel to the surface of the comb tooth main plate (2) between adjacent main tooth plates (16). The upper sealing plate (4) extends to the opposite side of the bridge beam joint (9). The fixed side device is fixed to the fixed bridge box girder (10), and is provided with a support plate, a secondary comb tooth web plate (12) and a comb tooth secondary plate (11) from bottom to top. The support plate includes a side beam (13) and a positioning baffle (15). The front and rear parts of the lower side of the secondary comb tooth web plate (12) are respectively welded with the side beam (13) and the positioning baffle (15) which are horizontally continuous. The lower ends of the side beam (13) and the positioning baffle (15) are welded and fixed to the fixed bridge box girder (10). The upper side of the secondary comb tooth web plate (12) is welded to the comb tooth secondary plate (11). The comb tooth secondary plate (11) is provided with multiple secondary tooth plates (17) whose tail ends are connected as one piece and whose front ends extend vertically toward the bridge beam joint (9). The secondary comb tooth web plate (12) is a series of independent long plates, each covered by a secondary tooth plate (17). The upper surface of the secondary comb plate (11) is at the same height as the upper surface of the main comb plate (2), and the main comb plate (16) and the secondary comb plate (17) overlap each other in the plane when the main comb plate (16) is in a horizontal state. The sealing plate also includes a lower sealing plate (5), and the lower sealing plate (5) is welded parallel to the surface of the main comb plate (2) at the bottom or lower side between adjacent main comb web plates (3). The lower sealing plate (5) is located in front of the open bridge box girder (7) near the bridge beam joint (9). When the lower sealing plate (5) is in a horizontal state, a baffle (8) is provided between the lower part covered by the fixed bridge box girder (10) and the fixed bridge box girder (10). The baffle (8) is provided with a support part (19) welded and fixed to the fixed bridge box girder (10) and a contact part (18) close to the lower sealing plate (5). An elastic buffer plate (6) is provided between the lower sealing plate (5) and the contact part (18) and is fixedly connected to the contact part (18). When the lower sealing plate (5) is in a horizontal state, it is in contact with the buffer plate (6). The contact part (18) and the support part (19) of the baffle (8) are respectively a horizontal plate and a vertical plate bent vertically. The lower end of the vertical plate is welded and fixed to the fixed bridge box girder (10), and the upper part of the horizontal plate is fixedly connected to the buffer plate (6).

2. The expansion joint device for the opening bridge according to claim 1, characterized in that: The buffer plate (6) is a rubber plate.

3. The expansion joint device for the opening bridge according to claim 1, characterized in that: The front end of the upper sealing plate (4) is bent vertically downward in front of the lower sealing plate (5) and suspended above the fixed bridge box girder (10).

4. The expansion joint device for the opening bridge according to claim 1, characterized in that: A stiffening plate (14) is provided between the side beam (13) and the positioning baffle (15), parallel to the positioning baffle (15). The stiffening plate (14) is welded in multiple sections between adjacent secondary comb teeth web plates (12), and its lower end is welded to the fixed bridge box girder (10).

5. The expansion joint device for an openable bridge according to claim 1, characterized in that: The space between the side beam (13) and the positioning baffle (15) is filled with mortar.

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