Expansion joint at beam end of cable-stayed bridge

Abstract

The invention discloses a cable-stayed bridge beam end expansion joint, and belongs to the technical field of bridge structures, the cable-stayed bridge beam end expansion joint comprises symmetrically arranged expansion joint channel steel, and anchoring steel bars are arranged on the opposite end faces of the expansion joint channel steel; limiting cavities are formed in the opposite end faces of the expansion joint channel steel, suspended cylindrical steel is arranged in the limiting cavities, and a plurality of connecting pieces are hinged between the adjacent cylindrical steel. A plurality of vertically-arranged mounting cavities are formed in the upper end face and the lower end face of the limiting cavity, spherical cavities are formed in the middles of the mounting cavities, connecting balls are movably arranged in the spherical cavities, through holes are coaxially formed in the connecting balls, hydraulic damping structures are arranged in the through holes, and the output ends of the hydraulic damping structures are hinged to the cylindrical steel balls. The invention aims to solve the problems that a bridge body continuously vibrates due to external factors such as vehicles and wind-induced effects, so that the bridge body is easily fatigued, the deformation recovery capability is reduced, and a bridge expansion joint cannot be reset.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge structures, and particularly relates to a stay cable bridge end expansion joint. Background Art

[0002] The stay cable bridge end expansion joint refers to a gap provided between adjacent beam bodies to meet the deformation requirements of the stay cable bridge deck. It is required that the expansion joint can freely expand and contract in two directions parallel and perpendicular to the bridge axis, and be firm and reliable, so as to meet the displacement and connection of the superstructure caused by vehicle loads and bridge building materials.

[0003] The main structure of the traditional expansion joint is mainly composed of two profiled steels formed by hot rolling as a whole and anchor bars for welding and fixing; in the prior art, the deformation reset of the beam body and the reset of the channel steel basically rely on the beam body itself to recover the deformation. However, during the long-term use of the bridge, the beam body is continuously vibrated by external factors such as vehicles and wind-induced effects, which is likely to cause fatigue of the bridge beam body and reduce the ability to recover deformation, resulting in the inability of the bridge expansion joint to reset. Summary of the Invention

[0004] In view of this, the present invention discloses a stay cable bridge end expansion joint, aiming to solve the problem that the beam body is continuously vibrated by external factors such as vehicles and wind-induced effects, which is likely to cause fatigue of the bridge beam body and reduce the ability to recover deformation, resulting in the inability of the bridge expansion joint to reset.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A stay cable bridge end expansion joint includes symmetrically arranged expansion joint channel steels, and anchor bars are arranged on the opposite end faces of the expansion joint channel steels; limiting cavities are respectively opened on the opposite end faces of the expansion joint channel steels, columnar steels are suspended in the limiting cavities, and a plurality of connecting pieces are hinged between adjacent columnar steels; a plurality of vertically arranged installation cavities are respectively opened on the upper and lower end faces of the limiting cavity, a spherical cavity is arranged in the middle of the installation cavity, a connecting ball is movably arranged in the spherical cavity, a through hole is coaxially opened on the connecting ball, a hydraulic damping structure is arranged in the through hole, and the output ends of the hydraulic damping structures are respectively ball-jointed to the columnar steels.

[0007] In this solution, when the deformation of the beam body causes relative movement between adjacent beam bodies, the two side beam bodies drive the expansion joint channel steels to move synchronously, so that a relative displacement occurs between the expansion joint channel steels and the columnar steels, thereby driving the columnar steels to drive the hydraulic damping structure to deflect in the direction of the beam body deformation, and driving the output ends of the hydraulic damping structure to move. The hydraulic damping structure is used for energy consumption, reducing the tendency of the beam body deformation, and applying an auxiliary resetting force to the beam body through the hydraulic damping structure after the beam body deformation ends to help the beam body reset and reduce the fatigue of the beam body.

[0008] In addition, by utilizing the deflection of the connecting ball, the force direction of the hydraulic damping structure deflects along with the deformation direction of the beam body, thereby changing the force direction of the expansion joint channel steel, avoiding the continuous unchanged force direction of the expansion joint channel steel, preventing metal fatigue from occurring at the connection between the expansion joint channel steel and the anchor reinforcement due to continuous stress, and affecting the stability of the expansion joint channel steel.

[0009] Furthermore, the hydraulic damping structure includes a hydraulic cylinder slidably connected to the connecting ball. The hydraulic cylinder is sealed with hydraulic oil. A hydraulic plate is slidably connected in the hydraulic cylinder. A hydraulic rod is fixed on the hydraulic plate and penetrates through the hydraulic cylinder and is hinged to the cylindrical steel ball. An elastic reset member is arranged between the hydraulic rod and the hydraulic cylinder. A plurality of grooves are formed on the periphery of the through hole. Sliding grooves facing the center of the connecting ball are respectively formed in the middle of the grooves. Sliding rods are coaxially slidably connected in the sliding grooves. Horizontal rotating shafts perpendicular to the sliding rods are respectively rotatably connected to the upper and lower sides of the ends of the sliding rods facing the center of the connecting ball. Connecting rods respectively hinged to the corresponding hydraulic rods and hydraulic cylinders are fixed on the rotating shafts. Gears are fixed on the rotating shafts, and adjacent gears are meshed with each other.

[0010] In this solution, when relative displacement occurs between the expansion joint channel steel and the cylindrical steel, the expansion joint channel steel drives the hydraulic plate to relatively move in the hydraulic cylinder through the hydraulic rod, thereby triggering hydraulic energy consumption. In addition, when the hydraulic rod moves, the hydraulic rod drives the sliding rod to slide in the sliding groove through the connecting rod and the rotating shaft, and the sliding rod drives the hydraulic cylinder to relatively move with respect to the hydraulic rod through another connecting rod and another rotating shaft. The rotation of the rotating shafts on the same sliding rod is synchronously reversed by the meshing of the gears, and then the adjacent connecting rods are synchronously deflected in the reverse direction, so as to limit the synchronous movement of the hydraulic rod and the hydraulic cylinder in the same or opposite directions, realize increasing the moving stroke of the hydraulic plate, and achieve the purpose of enhancing the hydraulic energy consumption efficiency.

[0011] Furthermore, a plurality of positioning holes for inserting the ends of the sliding rods are formed on the periphery of the spherical cavity. The diameter of one end of the sliding groove facing the center of the connecting ball is smaller than that of the other end. A limiting block is arranged on the end of the sliding rod facing the positioning hole, and the outer diameter of the limiting block is smaller than the diameter of the positioning hole.

[0012] In this solution, when the relative movement between the expansion joint channel steel and the cylindrical steel reaches the limit position, the limiting block at the end of the sliding rod is inserted into the corresponding positioning hole or the movement of the sliding rod is restricted by the end with a smaller diameter of the sliding groove, thereby restricting the continuous movement of the hydraulic cylinder and the hydraulic rod in the hydraulic damping structure, and further restricting the continuous relative movement of the expansion joint channel steel with respect to the cylindrical steel, preventing excessive deformation of the beam body that cannot be restored, and at the same time preventing damage to the hydraulic damping structure.

[0013] Furthermore, waterproof platforms are arranged at the opposite ends of the expansion joint channel steel.

[0014] Furthermore, the anchor reinforcement is U-shaped.

[0015] Furthermore, a waterproof rubber strip is detachably connected between the expansion joint channel steels.

[0016] Furthermore, the diameter of the through hole gradually increases from the middle to both ends.

[0017] Other advantages, objectives, and features of the present invention will be described in the subsequent specification, and to some extent, they are obvious to those skilled in the art, or those skilled in the art can obtain teachings from the practice of the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the following specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the objectives, technical solutions, and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0019] Figure 1 It is a schematic structural diagram of an embodiment of the present invention;

[0020] Figure 2 It is a longitudinal sectional view of an embodiment of the present invention;

[0021] Figure 3 is Figure 2 an enlarged schematic view of part A in

[0022] The reference signs in the drawings are as follows: expansion joint channel steel 1, anchor reinforcement 2, cylindrical steel 3, connecting piece 4, connecting ball 5, hydraulic cylinder 6, hydraulic plate 7, hydraulic rod 8, elastic reset member 9, sliding rod 10, rotating shaft 11, connecting rod 12, gear 13, positioning hole 14, limiting block 15, waterproof platform 16, waterproof rubber strip 17. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] As Figures 1 to 3 shown:

[0024] A stay cable bridge end expansion joint includes symmetrically arranged expansion joint channel steels 1, and anchor reinforcements 2 are arranged on opposite end faces of the expansion joint channel steels 1; limiting cavities are provided on opposite end faces of the expansion joint channel steels 1, suspended cylindrical steels 3 are arranged in the limiting cavities, and a plurality of connecting pieces 4 are hinged between adjacent cylindrical steels 3; a plurality of vertically arranged installation cavities are provided on upper and lower end faces of the limiting cavity, a spherical cavity is arranged in the middle of the installation cavity, a connecting ball 5 is movably arranged in the spherical cavity, a through hole is coaxially provided in the connecting ball 5, a hydraulic damping structure is arranged in the through hole, and output ends of the hydraulic damping structures are ball-jointed to the cylindrical steels 3.

[0025] In this solution, when the deformation of the beam body causes relative movement between adjacent beam bodies, the beam bodies on both sides drive the expansion joint channel steel 1 to move synchronously, and then relative displacement occurs between the expansion joint channel steel 1 and the columnar steel 3. As a result, the columnar steel 3 drives the hydraulic damping structure to deflect in the direction of the beam body deformation, and drives the output end of the hydraulic damping structure to move. The hydraulic damping structure is used for energy dissipation, reducing the tendency of the beam body deformation. After the beam body deformation ends, an auxiliary resetting force is applied to the beam body through the hydraulic damping structure to help the beam body reset and reduce the beam body fatigue.

[0026] In addition, by using the deflection of the connecting ball 5, the force direction of the hydraulic damping structure deflects along with the beam body deformation direction, and then the force direction of the expansion joint channel steel 1 changes, avoiding the continuous unchanged force direction of the expansion joint channel steel 1, preventing metal fatigue at the connection between the expansion joint channel steel 1 and the anchoring steel bars 2 due to continuous force, and affecting the stability of the expansion joint channel steel 1. At the same time, by using the connecting piece 4, the hydraulic damping structures in adjacent expansion joint channel steels 1 all perform hydraulic energy dissipation operations, improving the hydraulic energy dissipation range and also strengthening the auxiliary reset of the beam body.

[0027] In this embodiment, the hydraulic damping structure includes a hydraulic cylinder 6 slidably connected to the connecting ball 5. Hydraulic oil is sealed in the hydraulic cylinder 6. A hydraulic plate 7 is slidably connected in the hydraulic cylinder 6. A hydraulic rod 8 fixed to the hydraulic plate 7 and ball-jointed to the columnar steel 3 penetrates through the hydraulic cylinder 6. An elastic reset member 9 is arranged between the hydraulic rod 8 and the hydraulic cylinder 6. A plurality of grooves are formed on the periphery of the through hole. Sliding grooves facing the center of the connecting ball 5 are respectively formed in the middle of the grooves. Sliding rods 10 are coaxially slidably connected in the sliding grooves. Rotating shafts 11 perpendicular to the sliding rods 10 horizontally are respectively rotatably connected to the upper and lower sides of the ends of the sliding rods 10 facing the center of the connecting ball 5. Connecting rods 12 respectively hinged to the corresponding hydraulic rods 8 and hydraulic cylinders 6 are fixed to the rotating shafts 11. Gears 13 are fixed to the rotating shafts 11, and adjacent gears 13 are meshed with each other.

[0028] In this solution, when relative displacement occurs between the expansion joint channel steel 1 and the columnar steel 3, the expansion joint channel steel 1 drives the hydraulic plate 7 to move relatively in the hydraulic cylinder 6 through the hydraulic rod 8, thereby triggering hydraulic energy dissipation. In addition, when the hydraulic rod 8 moves, the hydraulic rod 8 drives the sliding rod 10 to slide in the sliding groove through the connecting rod 12 and the rotating shaft 11. The sliding rod 10 then drives the hydraulic cylinder 6 to move relative to the hydraulic rod 8 through another connecting rod 12 and another rotating shaft 11. The meshing of the gears 13 enables the rotating shafts 11 on the same sliding rod 10 to rotate synchronously in opposite directions, and then enables the adjacent connecting rods 12 to deflect synchronously in opposite directions, so as to limit the synchronous movement of the hydraulic rod 8 and the hydraulic cylinder 6 in the same or opposite directions, achieving the purpose of increasing the moving stroke of the hydraulic plate 7 and enhancing the hydraulic energy dissipation efficiency.

[0029] In this embodiment, a number of positioning holes 14 for inserting the ends of the sliding rods 10 are provided on the circumferential side of the spherical cavity. The diameter of one end of the sliding groove facing the center of the connecting ball 5 is smaller than that of the other end. A limiting block 15 is provided at the end of the sliding rod 10 facing the positioning hole 14, and the outer diameter of the limiting block 15 is smaller than the diameter of the positioning hole 14.

[0030] In this solution, when the expansion joint channel steel 1 and the cylindrical steel 3 move relative to each other to the extreme position, the limiting block 15 at the end of the sliding rod 10 is inserted into the facing positioning hole 14 or its movement is restricted by the end with a smaller diameter of the sliding groove, thereby restricting the continuous movement of the hydraulic cylinder 6 and the hydraulic rod 8 in the hydraulic damping structure, and thus restricting the continuous relative movement of the expansion joint channel steel 1 with respect to the cylindrical steel 3, preventing excessive deformation of the beam body that cannot be restored, and at the same time preventing damage to the hydraulic damping structure.

[0031] In this embodiment, waterproof platforms 16 are provided at the opposite ends of the expansion joint channel steel 1.

[0032] By providing the waterproof platforms 16, rainwater is prevented from contacting the connection between the expansion joint channel steel 1 and the anchor reinforcement 2, preventing corrosion at the connection.

[0033] In this embodiment, the anchor reinforcement 2 is U-shaped.

[0034] The U-shaped anchor reinforcement 2 increases the connection stability between the expansion joint channel steel 1 and the beam body.

[0035] In this embodiment, a waterproof rubber strip 17 is detachably connected between the expansion joint channel steels 1.

[0036] Structures such as the waterproof rubber strip 17 and the connecting member 4 are used for shielding to prevent erosion by rainwater and reduce the service life of the device.

[0037] In this embodiment, the diameter of the through hole gradually increases from the middle to both ends.

[0038] This is used to expand the deflection range of the hydraulic rod 8 and the hydraulic cylinder 6, avoiding restrictions on the movement of the hydraulic damping structure.

[0039] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A telescopic joint at the end of a cable-stayed bridge, characterized in that: It includes expansion joint channel steels arranged symmetrically, and anchoring steel bars are arranged on the opposite end faces of the expansion joint channel steels; limiting cavities are opened on the opposite end faces of the expansion joint channel steels, column-shaped steels suspended are arranged in the limiting cavities, and a number of connecting pieces are hinged between adjacent column-shaped steels; a number of vertically arranged installation cavities are opened on the upper and lower end faces of the limiting cavity, a spherical cavity is arranged in the middle of the installation cavity, a connecting ball is movably arranged in the spherical cavity, through holes are coaxially opened on the connecting ball, hydraulic damping structures are arranged in the through holes, and the output ends of the hydraulic damping structures are ball-hinged to the column-shaped steels respectively.

2. The expansion joint at the end of a cable-stayed bridge according to claim 1, wherein: The hydraulic damping structure includes a hydraulic cylinder slidably connected to the connecting ball, hydraulic oil is sealed in the hydraulic cylinder, a hydraulic plate is slidably connected in the hydraulic cylinder, a hydraulic rod fixedly connected to the column-shaped steel by passing through the hydraulic cylinder is fixed on the hydraulic plate, and an elastic resetting member is arranged between the hydraulic rod and the hydraulic cylinder; a number of grooves are opened on the periphery of the through hole, sliding grooves facing the center of the connecting ball are opened in the middle of the grooves, sliding rods are coaxially slidably connected in the sliding grooves, horizontal rotating shafts perpendicular to the sliding rods are rotatably connected to the upper and lower sides of the end portions of the sliding rods facing the center of the connecting ball, connecting rods hinged to the corresponding hydraulic rods and hydraulic cylinders respectively are fixed on the rotating shafts, and gears are fixed on the rotating shafts and meshed with adjacent gears.

3. The expansion joint at the end of a cable-stayed bridge according to claim 2, wherein: A number of positioning holes for inserting the end portions of the sliding rods are opened on the periphery of the spherical cavity, the diameter of one end of the sliding groove facing the center of the connecting ball is smaller than that of the other end, a limiting block is arranged on the end portion of the sliding rod facing the positioning hole, and the outer diameter of the limiting block is smaller than the diameter of the positioning hole.

4. The expansion joint at the end of a cable-stayed bridge according to claim 3, characterized in that: Waterproof platforms are arranged at the opposite ends of the expansion joint channel steels respectively.

5. The expansion joint at the end of a cable-stayed bridge according to claim 4, characterized in that: The anchoring steel bar is U-shaped.

6. The expansion joint at the end of a cable-stayed bridge according to claim 5, characterized in that: A waterproof rubber strip is detachably connected between the expansion joint channel steels.

7. The expansion joint at the end of a cable-stayed bridge according to claim 6, characterized in that: The diameter of the through hole gradually increases from the middle to both ends.

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