Connecting structure of high-speed rail bridge abutment and prefabricated box girder

Abstract

The invention relates to the technical field of bridges, in particular to a connecting structure of a high-speed rail bridge abutment and a prefabricated box girder, and a protective cover is arranged outside a plate-type support in a sleeving mode to isolate rainwater and dust and prevent rubber from being eroded. A positive pressure cavity is defined by the protective cover and the rubber main body, and pressure difference exists between the inner side and the outer side of the protective cover, so that a medium is further prevented from permeating into the protective cover and corroding rubber, and the service life of the connecting mechanism is prolonged; in addition, the positive pressure cavity gives pressure to the rubber body, the deformation speed of the rubber body is reduced, and the service life is further prolonged. By arranging the adjusting mechanism, the positive pressure cavity is kept at a preset value. And the problem that gas in the positive pressure cavity leaks from the joint of the protective cover and the upper support or the joint of the protective cover and the lower support after long-term use is avoided. The damping cylinders are arranged to buffer vibration of a bridge floor, and heat generated by the damping cylinders is utilized to increase the temperature of the rubber main body, so that the problem that rubber deforms and cracks in a cold environment is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridges, and in particular to a connection structure between an abutment of a high-speed railway bridge and a prefabricated box girder. Background Art

[0002] With the rapid development of high-speed railway bridge construction, the connection structure between abutments and prefabricated box girders has increasingly higher requirements for bridge durability and safety. At present, bridge bearing systems mainly adopt two types: plate rubber bearings and pot bearings. Plate rubber bearings are widely used due to their low cost and convenient installation, but their performance defects under complex working conditions are gradually emerging, and targeted improvements are urgently needed. The existing plate rubber bearings are mainly composed of laminated rubber and steel plates, and their axial bearing capacity is significantly lower than that of pot bearings. Under the high-frequency vibration load of high-speed railway bridges, the rubber layer is prone to internal fatigue cracks due to repeated shear deformation, resulting in a decrease in the bearing capacity of the overall structure. Especially when the bridge is subjected to eccentric loads or impact loads, the local stress concentration phenomenon in the rubber layer is aggravated, accelerating the deformation and even fracture risks of the bearings.

[0003] In order to extend the service life of the plate rubber bearing, the prior art usually adds a protective cover to the periphery of the bearing, such as a flexible plate rubber wind-resistant bearing proposed in the Chinese patent with the authorization announcement number CN220867965U, which uses the closed space formed by the flexible structure of the annular rubber enclosure and the annular rubber docking piece to surround the rubber bearing body for protection, thereby blocking rain and dust. However, it was found in actual use that the joint between the protective cover and the bearing body is prone to produce micro-gaps due to vibration, and external media can still penetrate into the interior and corrode the rubber layer. In addition, in cold areas, the rubber material of traditional plate rubber bearings will harden significantly and lose its elastic deformation ability, resulting in failure of the bearing function. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention proposes a connection structure between a high-speed railway bridge abutment and a prefabricated box girder, which solves the problems in the prior art that the plate rubber bearing has a small axial load and is corroded in harsh environments.

[0005] A connection structure between a high-speed railway bridge abutment and a prefabricated box girder of the present invention adopts the following technical solution, including: An upper support, fixedly connected to the box girder; The lower support is fixedly connected to the abutment; The supporting mechanism is arranged between the upper support and the lower support, and includes a plate support and a protective cover; the plate support includes a rubber body and a plurality of reinforcing steel plates, the reinforcing steel plates are arranged horizontally, and the plurality of reinforcing steel plates are embedded in the rubber body at intervals along the vertical direction; two plate supports are arranged at intervals along the vertical direction, and a reinforcing steel plate is arranged between the two plate supports; the protective cover is sleeved outside the rubber body, and the two define a positive pressure cavity, and the positive pressure cavity is filled with gas so that the air pressure in the positive pressure cavity is greater than the atmospheric pressure; the two ends of the protective cover are respectively fixedly connected to the upper support and the lower support; The positive pressure chamber is connected with an adjusting mechanism, which is used to keep the positive pressure chamber at a preset value; the adjusting mechanism includes an airway, a piston, a first one-way valve, a second one-way valve, a third one-way valve and an air inlet pipe; the rubber body, the reinforced steel plate and the reinforced steel plate are provided with vertical through holes, and the through holes and the upper support and the lower support define a sensing chamber; the two ends of the air inlet pipe are respectively connected to the outside and the sensing chamber; the first one-way valve is arranged at the position where the air inlet pipe is connected to the sensing chamber; one end of the airway is connected to the sensing chamber, and the other end is connected to the positive pressure chamber; the second one-way valve It is arranged at the position where the airway and the positive pressure chamber are connected; the piston is slidably installed in the airway, and the third one-way valve is installed on the piston; there is a connecting chamber between the piston and the second one-way valve; the first one-way valve allows gas to enter the sensing chamber from the outside in one direction; the second one-way valve allows gas to enter the positive pressure chamber from the connecting chamber in one direction; the third one-way valve allows gas to enter the connecting chamber from the sensing chamber in one direction; when the distance between the upper support and the lower support increases, the piston moves toward the sensing chamber; when the distance between the upper support and the lower support decreases, the piston moves toward the positive pressure chamber.

[0006] Optionally, multiple airways, pistons, second one-way valves and third one-way valves are provided, and the multiple airways are evenly distributed along the circumference. A piston is slidably installed in each airway, and a third one-way valve is installed in each piston; a second one-way valve is installed at the connection position between each airway and the positive pressure chamber.

[0007] Optionally, a damping cylinder is provided in the sensing chamber, the damping cylinder is fixedly connected to the lower support, and the upper end of the damping cylinder abuts against the upper support.

[0008] Optionally, the air passage comprises a spiral section and a straight section, and the piston is slidably mounted on the straight section.

[0009] Optionally, the protective cover is provided with a supporting mesh.

[0010] Optionally, the upper support and the lower support both include a fixing plate and a plurality of mounting columns; the plurality of mounting columns of the upper support are fixedly connected to a side of the fixing plate away from the lower support; the plurality of mounting columns of the lower support are fixedly connected to a side of the fixing plate away from the upper support.

[0011] Optionally, the upper ends of the support net and the protective cover are fixedly connected to the fixing plate of the upper support by a plurality of bolts; and the lower ends of the support net and the protective cover are fixedly connected to the fixing plate of the lower support by a plurality of bolts.

[0012] The beneficial effects of the present invention are as follows: by arranging a protective cover on the outside of the plate support, rainwater and dust are isolated to avoid erosion of rubber. At the same time, a positive pressure cavity is defined by the protective cover and the rubber body, and there is a pressure difference between the inner and outer sides of the protective cover, which further prevents the medium from penetrating into the protective cover and eroding the rubber, thereby extending the service life of the connection mechanism; in addition, the positive pressure cavity applies pressure to the rubber body, thereby slowing down the deformation speed of the rubber body, further extending the service life of the connection mechanism.

[0013] Furthermore, by setting up an adjustment mechanism, when the air pressure in the positive pressure chamber decreases, gas is added therein to maintain the air pressure. Compared with the prior art, the adjustment mechanism in the present invention can utilize the vibration generated by the bridge deck when the vehicle passes over the bridge deck to drive the gas flow, thereby realizing the self-compensation function of the positive pressure chamber and reducing manual intervention. This solves the problem of gas leakage from the connection between the protective cover and the upper support or the protective cover and the lower support after long-term use, ensures that the air pressure in the positive pressure chamber is sufficient, thereby ensuring the pressure and anti-corrosion effect on the rubber body, and further extending the service life of the connection mechanism. In addition, by adding a reinforcing steel plate between the plate supports, the axial support load of the support mechanism is further increased.

[0014] At the same time, by setting up a damping cylinder, when the high-speed railway passes over the bridge deck, the damping cylinder buffers the vibration of the bridge deck, and during operation, the damping cylinder generates heat as the damping fluid flows, which increases the air temperature in the sensing chamber. In the process of gas passing from the sensing chamber through the connecting chamber and entering the positive pressure chamber, and after the air enters the positive pressure chamber, heat exchange occurs with the rubber body, thereby increasing the temperature of the rubber body, thereby solving the problem of deformation and cracking of the rubber in a colder environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic diagram of the overall structure of a connection structure between a high-speed railway bridge abutment and a prefabricated box girder according to the present invention; Figure 2 This is a schematic diagram of an exploded structure of a connection structure between a high-speed railway bridge abutment and a prefabricated box girder according to the present invention; Figure 3 It is a front view of a connection structure between a high-speed railway bridge abutment and a prefabricated box girder according to the present invention; Figure 4 for Figure 3 Middle AA section cutaway view; Figure 5 for Figure 4 Enlarged image at the center X; Figure 6 for Figure 4 Enlarged view of point Y in the middle.

[0017] In the figure: 100, upper support; 101, mounting column; 102, fixing plate; 200, lower support; 300, support mechanism; 310, plate support; 311, rubber body; 312, reinforced steel plate; 320, protective cover; 321, support net; 330, positive pressure chamber; 340, reinforced steel plate; 400, regulating mechanism; 410, airway; 420, piston; 430, first one-way valve; 440, second one-way valve; 450, third one-way valve; 460, air intake pipe; 500. Damping cylinder. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] like Figures 1 to 6 As shown, a connection structure between a high-speed railway bridge abutment and a prefabricated box girder provided by an embodiment of the present invention includes an upper support 100, a lower support 200 and a support mechanism 300; The upper support 100 is fixedly connected to the box beam; The lower support 200 is fixedly connected to the abutment; The support mechanism 300 is arranged between the upper support 100 and the lower support 200, and includes a plate support 310 and a protective cover 320; the plate support 310 includes a rubber body 311 and a plurality of reinforcing steel plates 312, the reinforcing steel plates 312 are arranged horizontally, and the plurality of reinforcing steel plates 312 are embedded in the rubber body 311 at intervals along the vertical direction; the protective cover 320 is sleeved outside the rubber body 311, and the two define a positive pressure chamber 330, and the positive pressure chamber 330 is filled with gas so that the air pressure in the positive pressure chamber 330 is greater than the atmospheric pressure; the two ends of the protective cover 320 are respectively fixedly connected to the upper support 100 and the lower support 200.

[0020] The present invention sets a protective cover 320 on the outside of the plate support 310 to isolate rainwater and dust and avoid erosion of rubber. At the same time, a positive pressure chamber 330 is defined by the protective cover 320 and the rubber body 311. There is a pressure difference between the inside and outside of the protective cover 320, which further prevents the medium from penetrating into the protective cover 320 and eroding the rubber, thereby extending the service life of the connection mechanism; in addition, the positive pressure chamber 330 applies pressure to the rubber body, thereby slowing down the deformation speed of the rubber body, further extending the service life of the connection mechanism.

[0021] In a further embodiment, two plate supports 310 are provided at intervals in the vertical direction, and a reinforcing steel plate 340 is provided between the two plate supports 310 , thereby further increasing the strength of the support mechanism 300 and improving the axial load that the connection structure can withstand.

[0022] In a further embodiment, the positive pressure chamber 330 is connected to an adjustment mechanism 400, and the adjustment mechanism 400 is used to keep the positive pressure chamber 330 at a preset value. This avoids the problem of gas in the positive pressure chamber 330 leaking from the connection between the protective cover 320 and the upper support 100 or the protective cover 320 and the lower support 200 after long-term use, ensures that the gas pressure in the positive pressure chamber 330 is sufficient, thereby ensuring the pressure and anti-corrosion effect on the rubber body 311, ensuring the axial load and extending the service life of the connection mechanism.

[0023] In a further embodiment, the regulating mechanism 400 includes an air passage 410, a piston 420, a first one-way valve 430, a second one-way valve 440, a third one-way valve 450 and an air inlet pipe 460; the rubber body 311, the reinforcing steel plate 312 and the reinforcing steel plate 340 are provided with a vertical through hole, and the through hole and the upper support 100 and the lower support 200 define a sensing cavity; the two ends of the air inlet pipe 460 are respectively connected to the outside and the sensing cavity; the first one-way valve 430 is arranged at the position where the air inlet pipe 460 is connected to the sensing cavity; a plurality of air passages 410 are arranged, and the plurality of air passages 410 are evenly distributed along the circumference of the rubber body 311, and one end of the air passage 410 is connected to the outside and the sensing cavity. The first one-way valve 430 is connected to the sensing chamber, and the other end is connected to the positive pressure chamber 330; there are multiple second one-way valves 440, which are installed at the position where the airway 410 is connected to the positive pressure chamber 330; there are multiple pistons 420, which are slidably installed in the airway 410, and there are multiple third one-way valves 450, which are installed on the piston 420; there is a connecting chamber between the piston 420 and the second one-way valve 440; the first one-way valve 430 allows gas to enter the sensing chamber from the outside in one direction; the second one-way valve 440 allows gas to enter the positive pressure chamber 330 from the connecting chamber in one direction; the third one-way valve 450 allows gas to enter the connecting chamber from the sensing chamber in one direction.

[0024] During use, when the high-speed railway passes over the bridge, the bridge deck will vibrate, which in turn drives the prefabricated box girder to vibrate; when the distance between the upper support 100 and the lower support 200 increases, the piston 420 moves toward the sensing chamber, the volume of the connecting chamber increases, the air pressure decreases, the third one-way valve 450 opens, and the gas in the sensing chamber enters the connecting chamber.

[0025] When the distance between the upper support 100 and the lower support 200 decreases, the piston 420 moves toward the positive pressure chamber 330, the volume of the connecting chamber decreases, the air pressure increases, the second one-way valve 440 is activated, and the gas in the connecting chamber enters the positive pressure chamber 330. When the pressure in the sensing chamber is less than the preset value, the first one-way valve 430 is activated to suck the external gas into the sensing chamber through the air inlet pipe 460, thereby ensuring that the positive pressure chamber 330 can be continuously replenished with air. As a result, the positive pressure chamber 330 is kept in a positive pressure state, giving pressure to the rubber body 311, increasing the axial load of the connecting structure, and solving the problem of external media passing through the protective cover 320 to erode the rubber body 311. Compared with the prior art, the regulating mechanism 400 in the present invention can utilize the vibration generated by the bridge deck when the vehicle passes through the bridge deck to drive the gas flow, thereby realizing the self-compensation function of the positive pressure chamber 330 and reducing manual intervention.

[0026] In a further embodiment, a damping cylinder 500 is provided in the sensing chamber, and the damping cylinder 500 is fixedly connected to the lower support 200, and the upper end of the damping cylinder 500 is abutted against the upper support 100. By providing the damping cylinder 500, the damping cylinder 500 can buffer the vibration of the bridge deck when the high-speed rail passes over the bridge deck, and the damping cylinder 500 will generate heat as the damping fluid flows during operation, thereby increasing the air temperature in the sensing chamber. In the process of the gas passing from the sensing chamber through the connecting chamber and entering the positive pressure chamber 330, and after the air enters the positive pressure chamber 330, heat exchange occurs with the rubber body 311, thereby increasing the temperature of the rubber body 311, thereby solving the problem of deformation and cracking of the rubber in a colder environment.

[0027] In a further embodiment, the air channel 410 includes a spiral section and a straight section, and the piston 420 is slidably mounted on the straight section, thereby increasing the contact area between the air channel 410 and the reinforced steel plate 340, thereby improving the heat conduction efficiency, extending the heat conduction time, and further solving the problem of deformation and cracking of the rubber body 311 in a cold environment.

[0028] In a further embodiment, a support net 321 is provided on the outer cover of the protective cover 320 to prevent the protective cover 320 from excessively deforming outward, resulting in a reduction in the pressure of the gas on the rubber layer and a reduction in the axial load borne by the connection structure. The upper support 100 and the lower support 200 both include a fixing plate 102 and a plurality of mounting posts 101; the plurality of mounting posts 101 of the upper support 100 are fixedly connected to the side of the fixing plate 102 away from the lower support 200; the plurality of mounting posts 101 of the lower support 200 are fixedly connected to the side of the fixing plate 102 away from the upper support 100. The upper ends of the support net 321 and the protective cover 320 are fixedly connected to the fixing plate 102 of the upper support 100 by a plurality of bolts; the lower ends of the support net 321 and the protective cover 320 are fixedly connected to the fixing plate 102 of the lower support 200 by a plurality of bolts. When the support net 321 or the protective cover 320 is damaged, it can be replaced separately to further extend the service life of the connection structure.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A connection structure between a high-speed railway bridge abutment and a prefabricated box girder, characterized in that: include: An upper support, fixedly connected to the box girder; The lower support is fixedly connected to the abutment; The supporting mechanism is arranged between the upper support and the lower support, and includes a plate support and a protective cover; the plate support includes a rubber body and a plurality of reinforcing steel plates, the reinforcing steel plates are arranged horizontally, and the plurality of reinforcing steel plates are embedded in the rubber body at intervals along the vertical direction; two plate supports are arranged at intervals along the vertical direction, and a reinforcing steel plate is arranged between the two plate supports; the protective cover is sleeved outside the rubber body, and the two define a positive pressure cavity, and the positive pressure cavity is filled with gas so that the air pressure in the positive pressure cavity is greater than the atmospheric pressure; the two ends of the protective cover are respectively fixedly connected to the upper support and the lower support; The positive pressure chamber is connected with an adjusting mechanism, which is used to keep the positive pressure chamber at a preset value; the adjusting mechanism includes an airway, a piston, a first one-way valve, a second one-way valve, a third one-way valve and an air inlet pipe; the rubber body, the reinforced steel plate and the reinforced steel plate are provided with vertical through holes, and the through holes and the upper support and the lower support define a sensing chamber; the two ends of the air inlet pipe are respectively connected to the outside and the sensing chamber; the first one-way valve is arranged at the position where the air inlet pipe is connected to the sensing chamber; one end of the airway is connected to the sensing chamber, and the other end is connected to the positive pressure chamber; the second one-way valve It is arranged at the position where the airway and the positive pressure chamber are connected; the piston is slidably installed in the airway, and the third one-way valve is installed on the piston; there is a connecting chamber between the piston and the second one-way valve; the first one-way valve allows gas to enter the sensing chamber from the outside in one direction; the second one-way valve allows gas to enter the positive pressure chamber from the connecting chamber in one direction; the third one-way valve allows gas to enter the connecting chamber from the sensing chamber in one direction; when the distance between the upper support and the lower support increases, the piston moves toward the sensing chamber; when the distance between the upper support and the lower support decreases, the piston moves toward the positive pressure chamber.

2. The connection structure between a high-speed railway bridge abutment and a prefabricated box girder according to claim 1 is characterized in that: There are multiple airways, pistons, second one-way valves and third one-way valves, and the multiple airways are evenly distributed along the circumference. A piston is slidably installed in each airway, and a third one-way valve is installed in each piston; a second one-way valve is installed at the connection position between each airway and the positive pressure chamber.

3. The connection structure between a high-speed railway bridge abutment and a prefabricated box girder according to claim 2 is characterized in that: A damping cylinder is arranged in the induction cavity. The damping cylinder is fixedly connected to the lower support, and the upper end of the damping cylinder abuts against the upper support.

4. The connection structure between a high-speed railway bridge abutment and a prefabricated box girder according to claim 3 is characterized in that: The air passage comprises a spiral section and a straight section, and the piston is slidably mounted on the straight section.

5. The connection structure between a high-speed railway bridge abutment and a prefabricated box girder according to claim 1 is characterized in that: The protective cover is provided with a support mesh.

6. The connection structure between a high-speed railway bridge abutment and a prefabricated box girder according to claim 5, characterized in that: The upper support and the lower support both include a fixing plate and a plurality of mounting columns; the plurality of mounting columns of the upper support are fixedly connected to the side of the fixing plate away from the lower support; the plurality of mounting columns of the lower support are fixedly connected to the side of the fixing plate away from the upper support.

7. The connection structure between a high-speed railway bridge abutment and a prefabricated box girder according to claim 6, characterized in that: The upper ends of the support net and the protective cover are fixedly connected to the fixing plate of the upper support through a plurality of bolts; the lower ends of the support net and the protective cover are fixedly connected to the fixing plate of the lower support through a plurality of bolts.

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