Adjustable prestressed steel structure bridge expansion joint device and method thereof

Abstract

The invention relates to an adjustable prestressed steel structure bridge expansion joint device which comprises an expansion joint main body mechanism, and the expansion joint main body mechanism comprises edge beams, channel steel frames, supporting vertical plates, fixing ribs, rubber strip grooves, middle beams, a displacement control box, cross beams, rubber supports, sliding supports, lateral fixing foot ribs and bottom fixing foot ribs. The two sets of edge beams are symmetrically arranged on the two sides of the bridge expansion joint, each edge beam is composed of a channel steel frame, a plurality of sets of supporting vertical plates and fixing ribs, the supporting vertical plates are evenly distributed on the outer sides of the two sets of edge beams, and the fixing ribs are fixedly arranged at the outward extending ends of the supporting vertical plates. Adhesive tape grooves are formed in the channel steel frames on the sides, close to each other, of the two side beams, the middle beam is movably arranged between the two side beams, the crack resistance and rigidity of the structure can be effectively improved, cracks on the periphery of the expansion joint are reduced, and durability is improved; real-time adjustment of the preload between the expansion joints is achieved, and the stability of the expansion joint structure is improved.

Description

Technical Field

[0001] The invention relates to the technical field of steel structure bridges, in particular to an adjustable prestressed steel structure bridge expansion joint device and a method thereof. Background Art

[0002] Bridge expansion joints refer to expansion joints that are usually set between the two beam ends, between the beam ends and the abutments, or at the hinged position of the bridge to meet the requirements of bridge deck deformation. The expansion joints are required to be able to freely expand and contract in both directions parallel and perpendicular to the bridge axis, be firm and reliable, and be smooth without sudden jumps and noise when vehicles pass through; they must be able to prevent rainwater and garbage and soil from infiltrating and blocking; and they must be easy and convenient to install, inspect, maintain, and remove dirt. At the expansion joints, the railings and the bridge deck pavement must be disconnected.

[0003] The expansion joint of a bridge is used to adjust the displacement and connection between the superstructure caused by vehicle loads and bridge construction materials. Once the expansion joint of a skew bridge is damaged, it will seriously affect the speed, comfort and safety of driving, and even cause driving safety accidents.

[0004] According to the current situation, there are two types of expansion joints for highway bridges: steel plate expansion joints and plugged expansion joints. Commonly used steel plate expansion joints include zinc iron sheet U-type expansion joints and lap plate expansion joints. The construction process of zinc iron sheet U-type expansion joint construction technology is relatively simple, and no more energy is consumed during construction, which effectively reduces the construction cost of highway bridges. Generally speaking, during the construction of sidewalks, construction workers will adopt zinc iron sheet U-type expansion joint construction technology according to actual conditions. This technology can effectively improve the seismic resistance and durability of highway bridges and extend their service life, so it is used more in steel bridges and concrete bridges. The plugged expansion joint has a small expansion amount, can save construction costs, is simple to operate, and has high efficiency and quality. However, it has poor stability and cannot be used for a long time, so it is mostly used in the construction of small-span highway bridges.

[0005] Applying expansion joint technology to highway bridge construction can improve its performance. This technology has the following advantages: First, it reduces the probability of traffic accidents and ensures the safe use of highway bridges. Second, it improves the stability of the overall structure of highway bridges and optimizes and improves them. Third, it improves the impact resistance of highway bridges and ensures that the stability of highway bridges is not affected by external impact, which also extends the service life of highway bridges to a certain extent. Fourth, it improves the overall load-bearing capacity of highway bridges.

[0006] At present, there are still many problems in the use of expansion joint construction technology in the construction process of highway bridges in my country, which affects the construction quality of highway bridge expansion joints. Specifically, the construction technology of highway bridge expansion joints has high requirements for the temperature around the construction site. The large temperature change during construction can easily affect the quality of the main structure. In addition, the construction of highway bridges is generally carried out outdoors, and the construction workers cannot control the climate and temperature during construction, which will affect the stability of the bridge structure and the expansion joint construction technology cannot be used normally. After the concrete construction is completed, the change in the expansion margin will cause the concrete structure to shrink significantly, reduce stability, and be detrimental to the stability of the highway bridge. Second, in addition to objective factors, the use of highway bridge expansion joint construction technology will also be affected by subjective factors. During the specific construction, the construction workers did not realize the importance of using this technology, so they did not follow the specific specifications for construction, resulting in many unpredictable problems during construction.

[0007] In addition, the application of expansion joint construction technology requires a large number of construction machinery and equipment. However, construction workers did not follow specific procedures when operating these machinery and equipment, which reduced the construction quality of highway bridge expansion joints and was not conducive to the long-term use of highway bridges.

[0008] For example, the application number 202310051719.7 discloses an expansion joint device for a steel structure bridge, including a first bridge and a second bridge at one end of the first bridge, wherein a matching upper cover structure is also installed at one end of the first bridge, a supporting structure is installed at one end of the matching upper cover structure, a filling structure is arranged at the upper end of the supporting structure, the supporting structure is used to extend to the inside of the matching upper cover structure, and the filling structure covers the area between the matching upper cover structure and the supporting structure, the matching upper cover structure includes a supporting cover body and a yielding angle, and a yielding angle is provided on the lower surface of one end of the supporting cover body. The present invention improves the adhesion of the tires and increases the driving safety performance by making the tires always adhere to the road surface when the vehicle passes through the bridge gap, and the manufacturing material of the device can be changed according to the use environment, so that the device can adapt to the bridge body support function in a variety of harsh environments.

[0009] However, most of the current expansion joint mechanisms have the problem that the pressure applied between the expansion joint control structures is not pre-set, so that the crack resistance and rigidity of the structure are generally not high, cracks are easily formed around the expansion joints, and the durability of the components is poor; the preload between the expansion joints cannot be adjusted in real time, the stability of the expansion joint structure is not high, and the service life of the mechanical parts is not high due to mechanical vibration and noise. When damage occurs, the entire replacement is high in replacement cost and difficulty. Summary of the invention

[0010] The technical problem to be solved by the present invention is to pre-set the applied pressure between the expansion joint control structures to improve the crack resistance and rigidity of the structure, reduce the occurrence of cracks around the expansion joints, and improve the durability of the components; to achieve real-time adjustment of the preload between the expansion joints, improve the stability of the expansion joint structure, reduce mechanical vibration and noise, and increase the service life of mechanical parts. When damage occurs, try to replace it separately to reduce the replacement cost and difficulty.

[0011] In order to solve the above technical problems, the present invention provides an adjustable prestressed steel structure bridge expansion joint device, including an expansion joint main body mechanism, the expansion joint main body mechanism includes side beams, channel steel frames, support vertical plates, fixed ribs, rubber strip grooves, middle beams, displacement control boxes, cross beams, rubber bearings, sliding bearings, lateral fixed foot bars, and bottom fixed foot bars; the side beams are provided with two groups, which are symmetrically arranged on both sides of the bridge expansion joint, the side beams are composed of channel steel frames, support vertical plates, and fixed ribs, the support vertical plates are provided with multiple groups, which are evenly distributed on the outsides of the two groups of side beams, and the outwardly extending ends thereof are fixedly provided with fixed ribs, and the two groups of side beams are close to each other. A rubber strip groove is provided in the channel steel frame on the side, the middle beam is movably arranged between the two groups of side beams, the displacement control box is provided with multiple groups, fixedly arranged at the bottom of the side beams, between the supporting upright plates on the side beams on the same side, the cross beam is provided with multiple groups, fixedly arranged at the bottom of the middle beam, the rubber support is fixedly arranged at the top of the displacement control box, the sliding support is fixedly arranged at the bottom of the displacement control box, the middle beam is movably arranged between the rubber support and the sliding support, a lateral fixed foot bar is fixedly arranged on the outer side of the displacement control box away from the side beam, and a bottom fixed foot bar is fixedly arranged at the outer bottom; A prestress adjustment mechanism for applying a prestress load is fixedly arranged in the expansion joint main body mechanism; An external protection mechanism for protecting the expansion joint is fixedly arranged on the expansion joint main body mechanism.

[0012] Preferably, the prestressing adjustment mechanism comprises a wedge-shaped telescopic mechanism, an articulated oil pressure pre-tightening mechanism, a lead plate rubber pad mechanism, and a pre-tightening support plate; the pre-stressing adjustment mechanism is fixedly arranged in the displacement control box, the articulated oil pressure pre-tightening mechanism and the lead plate rubber pad mechanism are provided with multiple groups, which are fixedly arranged on both sides of the wedge-shaped telescopic mechanism, and the pre-tightening support plate is provided with two groups, which are symmetrically arranged at the ends of the articulated oil pressure pre-tightening mechanism and the lead plate rubber pad mechanism away from the wedge-shaped telescopic mechanism, one group of the pre-tightening support plates is close to the inner wall of the displacement control box, and the other group of the pre-tightening support plates is close to the end of the crossbeam; Preferably, the wedge-shaped telescopic mechanism includes a guide base, a downward pressing wedge block, a following wedge block, a limit slider, a limit groove, an avoidance groove, a guide slide groove, a guide corner boss, a lifting base, a lifting sleeve, a lifting screw rod, an active screw rod, a power motor, and a connecting plate; a limit slider is fixedly arranged on the guide base, an avoidance groove is fixedly opened at the bottom of the downward pressing wedge block, a limit groove is opened on the following wedge block, and the following wedge block is movably arranged on the limit slider on the guide base through the limit groove so that the following wedge block can be linearly displaced along the limit slider, guide slide grooves are symmetrically opened on the opposite side surfaces of the following wedge block, and guide corner bosses are symmetrically fixedly arranged on the opposite side surfaces of the downward pressing wedge block The boss, the pressing wedge block is movably arranged above the following wedge block, the guiding corner boss is movably arranged in the guiding slide groove, the lifting base is fixedly arranged on the top of the pressing wedge block, the lifting sleeve is fixedly arranged on the lifting base, the lifting screw is movably arranged in the lifting sleeve through a bearing, the active screw is movably arranged in the lifting sleeve through a bearing, and is perpendicular to the lifting screw, meshing transmission, the power motor is fixedly arranged on the lifting sleeve, and its shaft end is fixedly connected to one end of the active screw to transmit power, and the lifting screw is fixedly arranged with a connecting disk near one end of the following wedge block, and the other end of the connecting disk is fixedly connected to the following wedge block; Preferably, the articulated oil pressure pre-tightening mechanism comprises an articulated seat, a fixed articulated wall, a first movable articulated wall, a second movable articulated wall, a sliding roller, a linkage shaft, a support rod, and an oil pressure cylinder; each group of the articulated oil pressure pre-tightening mechanism is provided with two groups of the articulated seats, which are arranged opposite to each other, the fixed articulated walls are provided with two groups, one end of which is hinged to each other, and the other end is respectively fixedly hinged to the two groups of articulated seats, one end of the first movable articulated wall and the second movable articulated wall are hinged to each other, and the other end is movably connected to the sliding roller, the sliding roller is movably arranged on the articulated seat, the two groups of the first movable articulated walls are fixedly connected by the linkage shaft, the two groups of the second movable articulated walls are fixedly connected by the support rod, and the oil pressure cylinder is provided with two groups, which are fixedly connected between the linkage shaft and the support rod; Preferably, the lead plate rubber pad mechanism comprises a lead plate, a high elastic memory rubber pad, a frame, an elastic body, and a displacement groove; the lead plate and the high elastic memory rubber pad are alternately overlapped to form the lead plate rubber pad mechanism, the high elastic memory rubber pad comprises a frame arranged around, a plurality of groups of elastic bodies evenly arranged in the frame, and displacement grooves evenly arranged between the elastic bodies; Preferably, the outer protection mechanism comprises an end extension guard plate; the outwardly extending ends of the two groups of side beams are fixedly connected to the end extension guard plate; Preferably, the outer protection mechanism further comprises a fixed pin sleeve, a buffer rubber ring, and a hard rivet; the fixed pin sleeve is evenly arranged in multiple groups along the direction of the end extension guard plate, and is fixedly embedded in the bottom of the end extension guard plate; the buffer rubber ring is fixedly arranged in a countersunk hole provided on the end extension guard plate, and the end extension guard plate is fixedly arranged on the fixed pin sleeve by the hard rivet; Preferably, the outer protection mechanism further includes an outer tooth plate, retaining teeth, an intermediate tooth plate, and a tooth plate groove; the outer tooth plate is provided with two groups, which are respectively fixedly provided on the two groups of side beams, the intermediate tooth plate is fixedly provided on the intermediate beam, the outer tooth plate is evenly provided with a plurality of groups of retaining teeth, the intermediate tooth plate is evenly provided with a plurality of groups of tooth plate grooves, and the retaining teeth and the tooth plate grooves correspond to each other; Preferably, the outer protection mechanism further includes an independent tensile protection cover, a water guide plate, and a water guide groove; the independent tensile protection cover is provided with multiple groups, and both ends are fixedly arranged in the rubber strip grooves on the side beams and the middle beam, the water guide plate is provided with two groups, symmetrically arranged on both sides of the middle beam, and the water guide groove is provided with two groups, fixedly arranged on the side beams, with an upper opening, and the tail end of the water guide plate is arranged on the upper part of the water guide groove; A method for using an adjustable prestressed steel structure bridge expansion joint device comprises the following steps: S1, the prestressing adjustment mechanism adjusts the displacement of the wedge-shaped telescopic mechanism relative to the inner wall of the displacement control box and the end of the beam through temperature data information feedback, so as to stabilize the preload between the two; S2, the power motor drives the lifting screw to rotate through the active screw to achieve up and down linear motion, thereby driving the following wedge block to move up and down relative to the pressing wedge block through the connecting plate; when the pressing wedge block moves linearly downward, the guide corner boss moves linearly along the guide slot, pushing the following wedge block to move linearly along the limit slider, and under the action of the wedge-shaped inclined surface and the guide corner boss and the guide slot, the pressing wedge block and the following wedge block move synchronously in opposite directions; S3, a predetermined load pressure is set in the hydraulic cylinder through hydraulic oil. When the expansion joint becomes smaller, the displacement control box pushes the hinge seat, the hinges of the first movable hinge wall and the second movable hinge wall are compressed, the sliding roller rolls along the hinge seat, the two groups of hinge seats approach each other, and the hydraulic cylinder is compressed to absorb the load; when the expansion joint becomes larger, the action is opposite; S4. When the expansion joint becomes smaller, the displacement control box pushes the lead plate, thereby compressing the high elastic memory rubber pad to absorb load energy storage, and the elastic body deforms to cause the lead plate rubber pad mechanism to displace. When the expansion joint becomes larger, the action is opposite; S5. The vehicle contacts the end extension guard plate first and then contacts the side beam; S6. When a vehicle passes through the end extension guard plate, the impact pressure generated is transmitted to the buffer rubber ring through the hard rivet and diluted to the foundation through the fixed pin sleeve. The buffer rubber ring buffers each sudden pressure on the fixed pin sleeve and absorbs its shear force. S7. When the expansion joint changes, the outer tooth plate is driven by the side beam to move toward the middle tooth plate, and relative displacement occurs between the retaining teeth and the tooth plate groove; S8. When the expansion joint changes, the side beam and the middle beam undergo relative displacement, thereby driving the independent tensile protection cover to expand and contract; S9, the liquid flows into the water guide groove through the water guide plate and flows out through both ends of the water guide groove; Compared with the prior art, the present invention has the following beneficial effects: 1. By setting up a prestressed adjustment mechanism, the crack resistance and rigidity near the expansion joint of the steel structure bridge are improved. In terms of expansion joint control, by pre-applying pressure between the structures, the internal force of the expansion joint device generates compressive stress when the external load acts, which is used to offset or reduce the tensile stress generated by the external load. This can significantly improve the crack resistance and rigidity of the structure, effectively delay the appearance of cracks around the expansion joint, and thus improve the durability of the component; the prestressed adjustment mechanism enhances the fatigue resistance of the component and can better cope with load changes in long-term use.

[0013] 2. By setting up a wedge-shaped telescopic mechanism, the rotation of the wedge-shaped telescopic mechanism motor is automatically controlled through temperature control records and background parameter calculations, so as to realize real-time adjustment of the preload between the expansion joints, so as to achieve the same preload pressure value in the expansion joints under different temperature conditions, thereby greatly improving the stability of the expansion joint structure and increasing the overall service life of the equipment. In addition, the wedge-shaped telescopic mechanism is simple in design and compact in structure. It only needs to use external force to push the wedge-shaped structure to achieve fast and accurate positioning or movement. This mechanism has high reliability, no complex moving parts, low failure rate, relatively low maintenance cost, and is convenient for overall replacement.

[0014] 3. By setting up an articulated hydraulic preload mechanism, and setting up hydraulic preload mechanisms on both sides of the wedge-shaped telescopic mechanism and the expansion joint bridge, the hydraulic preload of the oil cylinder helps to improve the stability and reliability of the oil cylinder. Appropriate preload force can reduce mechanical vibration and noise, thereby extending the service life of mechanical parts. At the same time, it provides a better buffer stress area for the overall structure and improves the softness of the equipment; 4. By setting up the lead plate rubber pad mechanism, the new high-elastic rubber pad and the lead plate with stable material performance are combined, which not only plays a good supporting role, but also plays a certain preload matching and buffering role. In conjunction with the articulated oil pressure preload mechanism, the adaptability and functional adjustability of the equipment to environmental changes are improved.

[0015] 5. By setting up the end extension guard plate, the roadbed is less likely to be crushed by vehicles due to direct contact between the road base and the guard plate. By adding the extended guard plate, the crushed roadbed material will not directly enter the expansion joint, which improves the cleanliness of the expansion joint and increases the service life of the equipment.

[0016] 6. By setting fixed pin sleeves, buffer rubber rings and hard rivets, the risk of rivets detaching due to impact caused by the back and forth movement of vehicles is reduced, the service life of rivets is increased, and the service life of the entire equipment is increased.

[0017] 7. By setting the outer tooth plate and the middle tooth plate, the risk of external debris entering the expansion joint is reduced, and the service life of the equipment is increased.

[0018] 8. By setting up an independent tensile protection cover, the original whole rubber protection cover is changed to a segmented independent protection cover. When damage occurs, it can be replaced separately, which reduces the replacement cost and the difficulty of replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings: Figure 1 A top view of the present invention; Figure 2 It is a bottom view of the present invention; Figure 3 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 4 It is the front view of the present invention; Figure 5 for Figure 1 Schematic diagram of the structure of the cross section in the AA direction; Figure 6 for Figure 5 A partial enlarged schematic diagram of the middle B area; Figure 7 for Figure 3 A partial enlarged schematic diagram of the middle C area; Figure 8 A top view of the prestressing force adjustment mechanism of the present invention; Fig. 9 This is a front view of the prestressing force adjustment mechanism of the present invention; Fig.10 It is a schematic diagram of the three-dimensional structure of the prestressing force adjustment mechanism of the present invention; Fig.11 for Fig. 9 Schematic diagram of the structure of the cross section in the middle DD direction; Fig.12 It is a left view of the lead plate rubber pad mechanism of the present invention; Fig.13 for Fig.12 Schematic diagram of the structure of the cross section in the EE direction; In the figure: 1. Expansion joint main body; 101. Side beam; 102. Channel steel frame; 103. Support vertical plate; 104. Fixed rib; 105. Rubber strip groove; 106. Middle beam; 107. Displacement control box; 108. Crossbeam; 109. Rubber support; 110. Sliding support; 111. Lateral fixed rib; 112. Bottom fixed rib; 2. Prestressed pressure adjustment mechanism; 201. Wedge-shaped expansion mechanism; 202. Guide base; 203. Pressing wedge block; 204. Following wedge block; 205. Limiting slider; 206. Limiting groove; 207. Avoiding groove; 208. Guide slide; 209. Guide corner boss; 210. Lifting base; 211. Lifting sleeve; 212. Lifting screw; 213. Active screw; 214. Power motor; 215. Connecting Receiving plate; 216, hinged hydraulic preload mechanism; 217, hinged seat; 218, fixed hinged wall; 219, first movable hinged wall; 220, second movable hinged wall; 221, sliding roller; 222, linkage shaft; 223, support rod; 224, hydraulic cylinder; 225, lead plate rubber pad mechanism; 226, lead plate; 227, high elastic memory rubber pad; 228, frame; 229, elastomer; 230, displacement groove; 231, preload support plate; 3, external protection mechanism; 301, end extension guard plate; 302, fixed pin shaft sleeve; 303, buffer rubber ring; 304, hard rivet; 305, external tooth plate; 306, retaining tooth; 307, intermediate tooth plate; 308, tooth plate groove; 309, independent tensile protection cover; 310, water guide plate; 311, water guide groove; DETAILED DESCRIPTION Example 1

[0020] 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 creative work are within the scope of protection of the present invention.

[0021] See also Figure 1-Figure 13An adjustable prestressed steel structure bridge expansion joint device, comprising an expansion joint main body mechanism 1, the expansion joint main body mechanism 1 comprises a side beam 101, a channel steel frame 102, a support vertical plate 103, a fixed rib 104, a rubber strip groove 105, an intermediate beam 106, a displacement control box 107, a cross beam 108, a rubber bearing 109, a sliding bearing 110, a lateral fixed foot bar 111, and a bottom fixed foot bar 112; the side beam 101 is provided with two groups, symmetrically arranged on both sides of the bridge expansion joint, the side beam 101 is composed of a channel steel frame 102, a support vertical plate 103, and a fixed rib 104, the support vertical plate 103 is provided with multiple groups, evenly distributed on the outside of the two groups of side beams 101, and the fixed rib 104 is fixedly provided at the outwardly extending end thereof, and the two groups of side beams 101 are close to each other on one side of the channel steel frame A rubber strip groove 105 is provided in 102, the middle beam 106 is movably arranged between the two groups of side beams 101, the displacement control box 107 is provided with multiple groups, fixedly arranged at the bottom of the side beam 101, between the supporting upright plates 103 on the same side of the side beam 101, the cross beam 108 is provided with multiple groups, fixedly arranged at the bottom of the middle beam 106, the rubber support 109 is fixedly arranged at the top of the displacement control box 107, the sliding support 110 is fixedly arranged at the bottom of the displacement control box 107, the middle beam 106 is movably arranged between the rubber support 109 and the sliding support 110, a lateral fixed foot bar 111 is fixedly arranged on the outer side of the displacement control box 107 away from the side beam 101, and a bottom fixed foot bar 112 is fixedly arranged at the outer bottom; A prestress adjustment mechanism 2 for applying a prestress load is fixedly arranged in the expansion joint main body mechanism 1; An outer protection mechanism 3 for protecting the expansion joint is fixedly arranged on the expansion joint main body mechanism 1.

[0022] In some embodiments, see Figure 8The prestress adjustment mechanism 2 includes a wedge-shaped telescopic mechanism 201, an articulated oil pressure preload mechanism 216, a lead rubber pad mechanism 225, and a preload support plate 231; the prestress adjustment mechanism 2 is fixedly arranged in the displacement control box 107, and the articulated oil pressure preload mechanism 216 and the lead rubber pad mechanism 225 are provided with multiple groups, which are fixedly arranged on both sides of the wedge-shaped telescopic mechanism 201. The pre-tightening support plates 231 are provided in two groups, symmetrically arranged at the ends of the articulated oil pressure pre-tightening mechanism 216 and the lead rubber pad mechanism 225 away from the wedge-shaped telescopic mechanism 201, one group of the pre-tightening support plates 231 is close to the inner wall of the displacement control box 107, and the other group of the pre-tightening support plates 231 is close to the end of the beam 108; when in use, the prestressing adjustment mechanism 2 adjusts the displacement of the wedge-shaped telescopic mechanism 201 relative to the inner wall of the displacement control box 107 and the end of the beam 108 through temperature data information feedback, so as to stabilize the preload between the two; by setting up the prestressing adjustment mechanism, the crack resistance and rigidity near the expansion joint of the steel structure bridge are improved, and in the expansion joint control, by pre-applying pressure between the structures, the internal force of the expansion joint device generates compressive stress when the external load acts, so as to offset or reduce the tensile stress generated by the external load. Doing so can significantly improve the crack resistance and rigidity of the structure, effectively delaying the appearance of cracks around the expansion joints, thereby improving the durability of the components; the prestressed adjustment mechanism enhances the fatigue resistance of the components and can better cope with load changes during long-term use.

[0023] In some embodiments, see Fig. 9 , Fig.11The wedge-shaped telescopic mechanism 201 includes a guide base 202, a downward pressing wedge block 203, a following wedge block 204, a limiting slider 205, a limiting groove 206, an avoidance groove 207, a guide slide 208, a guide corner boss 209, a lifting base 210, a lifting sleeve 211, a lifting screw 212, an active screw 213, a power motor 214, and a connecting plate 215; the limiting slider 205 is fixedly arranged on the guide base 202, the avoiding groove 207 is fixedly opened at the bottom of the downward pressing wedge block 203, the following wedge block 204 is provided with a limiting groove 206, and the following wedge block 204 is movably arranged on the limiting slider 205 on the guide base 202 through the limiting groove 206 , so that the following wedge block 204 moves linearly along the limiting slider 205, the following wedge block 204 is symmetrically provided with guide grooves 208 on the two opposite sides, the pressing wedge block 203 is symmetrically fixed with guide corner bosses 209 on the two opposite sides, the pressing wedge block 203 is movably arranged above the following wedge block 204, the guide corner boss 209 is movably arranged in the guide groove 208, the lifting base 210 is fixedly arranged on the top of the pressing wedge block 203, the lifting sleeve 211 is fixedly arranged on the lifting base 210, the lifting screw 212 is movably arranged in the lifting sleeve 211 through a bearing, and the active screw 213 is movably arranged in the lifting sleeve 211 through a shaft The bearing is movably arranged in the lifting sleeve 211, perpendicular to the lifting screw rod 212, and meshing transmission. The power motor 214 is fixedly arranged on the lifting sleeve 211, and its shaft end is fixedly connected to one end of the active screw rod 213 to transmit power. The lifting screw rod 212 is fixedly provided with a connecting plate 215 at one end close to the follower wedge block 204, and the other end of the connecting plate 215 is fixedly connected to the follower wedge block 204; when in use, the power motor 214 drives the lifting screw rod 212 to rotate through the active screw rod 213 to achieve up and down linear motion, thereby driving the follower wedge block 204 to move up and down relative to the downward pressing wedge block 203 through the connecting plate 215; when When the downward pressing wedge block 203 moves linearly downward, the guide corner boss 209 moves linearly along the guide slot 208, pushing the following wedge block 204 to move linearly along the limit slider 205. Affected by the wedge-shaped inclined surface, the guide corner boss 209 and the guide slot 208, the downward pressing wedge block 203 and the following wedge block 204 move synchronously in opposite directions. By setting a wedge-shaped telescopic mechanism, the rotation of the wedge-shaped telescopic mechanism motor is automatically controlled through temperature control recording and background parameter calculation, so as to realize real-time adjustment of the preload between the expansion joints, so as to realize the same preload pressure value in the expansion joints under different temperature conditions, thereby greatly improving the stability of the expansion joint structure and the service life of the equipment as a whole.In addition, the wedge-shaped telescopic mechanism is simple in design and compact in structure. It can achieve fast and accurate positioning or movement by pushing the wedge-shaped structure with external force. This mechanism has high reliability, no complex moving parts, low failure rate, relatively low maintenance cost, and is convenient for overall replacement. ;

[0024] In some embodiments, see Fig.10 The articulated oil pressure pre-tightening mechanism 216 includes an articulated seat 217, a fixed articulated wall 218, a first movable articulated wall 219, a second movable articulated wall 220, a sliding roller 221, a linkage shaft 222, a support rod 223, and an oil pressure cylinder 224; each group of the articulated oil pressure pre-tightening mechanism 216 is provided with two groups of the articulated seats 217, which are arranged opposite to each other, and the fixed articulated wall 218 is provided with two groups, one end of which is hinged to each other, and the other end is respectively fixedly hinged to the two groups of the articulated seats 217, the first movable articulated wall 219 and the second movable articulated wall 220 are hinged to each other at one end, and the other end is movably connected to the sliding roller 221, and the sliding roller 221 is movably arranged on the articulated seat 217, and the two groups of the first movable articulated walls 219 are fixedly connected by the linkage shaft 222. The second movable hinged wall 220 is fixedly connected through the support rod 223, and the oil hydraulic cylinder 224 is provided with two groups, which are fixedly connected between the linkage shaft 222 and the support rod 223; when in use, the predetermined load pressure is set by the hydraulic oil in the oil hydraulic cylinder 224, and when the expansion joint becomes smaller, the displacement control box 107 pushes the hinge seat 217, the hinges of the first movable hinged wall 219 and the second movable hinged wall 220 are compressed, the sliding roller 221 rolls along the hinge seat 217, and the two groups of hinge seats 217 approach each other, and the oil hydraulic cylinder 224 is compressed to absorb the load; when the expansion joint becomes larger, the action is opposite; by setting an articulated oil pressure pre-tightening mechanism, setting an oil pressure pre-tightening mechanism on both sides of the wedge-shaped expansion mechanism and the expansion joint bridge, the oil pressure pre-tightening of the oil cylinder helps to improve the stability and reliability of the oil cylinder. Through appropriate pre-tightening force, mechanical vibration and noise can be reduced, thereby extending the service life of mechanical parts. At the same time, it provides a better buffer stress area for the overall structure and improves the softness of the equipment; In some embodiments, see Fig.12 , Fig.13The lead plate rubber pad mechanism 225 includes a lead plate 226, a high elastic memory rubber pad 227, a frame 228, an elastic body 229, and a displacement groove 230; the lead plate 226 and the high elastic memory rubber pad 227 are overlapped alternately to form the lead plate rubber pad mechanism 225, the high elastic memory rubber pad 227 includes a frame 228 arranged around, a plurality of groups of elastic bodies 229 are evenly arranged in the frame 228, and displacement grooves 230 are evenly arranged between the elastic bodies 229; when in use, when the expansion joint becomes smaller, the displacement control box 107 pushes the lead plate 226, thereby compressing the high elastic memory rubber pad 227 to absorb load energy storage, and the elastic body 229 is deformed to cause the lead plate rubber pad mechanism 225 to be displaced, and when the expansion joint becomes larger, the action is opposite; by setting the lead plate rubber pad mechanism, a new type of high elastic rubber pad is combined with a lead plate with stable material properties, and the support is provided, which not only plays a good supporting role, but also plays a certain preload matching and buffering role. Cooperating with the articulated hydraulic pre-tightening mechanism, it improves the adaptability and functional adjustability of the equipment to environmental changes.

[0025] In some embodiments, see Figure 1 The external protection mechanism 3 includes an end extension guard plate 301; the outwardly extending ends of the two groups of side beams 101 are fixedly connected to the end extension guard plate 301; when in use, the vehicle contacts the end extension guard plate 301 first, and then contacts the side beam 101; by setting the end extension guard plate, the roadbed is less likely to be crushed by vehicles due to direct contact between the roadbed surface and the guard plate, and by adding the extended guard plate, the crushed roadbed material will not directly enter the expansion joint, thereby improving the cleanliness of the expansion joint and increasing the service life of the equipment.

[0026] In some embodiments, see Figure 5-6 The outer protection mechanism 3 also includes a fixed pin sleeve 302, a buffer rubber ring 303, and a hard rivet 304; the fixed pin sleeve 302 is evenly arranged in multiple groups along the direction of the end extension guard plate 301, and is fixedly embedded in the bottom of the end extension guard plate 301, the buffer rubber ring 303 is fixedly set in the countersunk hole opened on the end extension guard plate 301, and the end extension guard plate 301 is fixedly set on the fixed pin sleeve 302 through the hard rivet 304; when in use, when a vehicle passes through the When the end guard plate 301 is extended, the impact pressure generated is transmitted to the buffer rubber ring 303 through the hard rivet 304, and diluted to the foundation through the fixed pin sleeve 302. The buffer rubber ring 303 buffers each sudden pressure on the fixed pin sleeve 302 and absorbs its shear force. By setting the fixed pin sleeve, buffer rubber ring and hard rivet, the risk of rivet detachment caused by impact caused by the back and forth passage of the vehicle is reduced, the service life of the rivet is increased, and the service life of the equipment as a whole is also increased.

[0027] In some embodiments, see Figure 7 The outer protection mechanism 3 also includes an outer tooth plate 305, retaining teeth 306, an intermediate tooth plate 307, and a tooth plate groove 308; the outer tooth plate 305 is provided with two groups, which are respectively fixed on the two groups of the side beams 101, and the intermediate tooth plate 307 is fixed on the intermediate beam 106. A plurality of groups of retaining teeth 306 are evenly arranged on the outer tooth plate 305, and a plurality of groups of tooth plate grooves 308 are evenly arranged on the intermediate tooth plate 307, and the retaining teeth 306 and the tooth plate grooves 308 correspond to each other; during use, when the expansion joint changes, the outer tooth plate 305 is driven by the side beam 101 to move toward the intermediate tooth plate 307, and a relative displacement occurs between the retaining teeth 306 and the tooth plate groove 308; by providing the outer tooth plate and the intermediate tooth plate, the risk of external debris entering the expansion joint is reduced, and the service life of the equipment is improved.

[0028] In some embodiments, see Figure 5 , Figure 7 The outer protection mechanism 3 also includes an independent tensile protection cover 309, a water guide plate 310, and a water guide groove 311; the independent tensile protection cover 309 is provided with multiple groups, and both ends are fixedly arranged in the rubber strip groove 105 on the side beam 101 and the middle beam 106, the water guide plate 310 is provided with two groups, symmetrically arranged on both sides of the middle beam 106, and the water guide groove 311 is provided with two groups, which are fixedly arranged on the side beam 101 and opened at the upper part. The tail end of the water guide plate 310 is arranged on the guide The upper part of the water trough 311; when in use, when the expansion joint changes, the side beam 101 and the middle beam 106 are relatively displaced, thereby driving the independent tensile protection cover 309 to expand and contract; the liquid flows into the water guide trough 311 through the water guide plate 310, and flows out through the two ends of the water guide trough 311; by setting an independent tensile protection cover, the original whole rubber protection cover is changed to a segmented independent protection cover, and when it is damaged, it can be replaced separately, which reduces the replacement cost and the difficulty of replacement.

[0029] A method for using an adjustable prestressed steel structure bridge expansion joint device comprises the following steps: S1, the prestressing adjustment mechanism 2 adjusts the displacement of the wedge-shaped telescopic mechanism 201 relative to the inner wall of the displacement control box 107 and the end of the beam 108 through temperature data information feedback, so as to stabilize the preload between the two; S2, the power motor 214 drives the lifting screw 212 to rotate through the active screw 213 to achieve up and down linear motion, thereby driving the following wedge block 204 to move up and down relative to the pressing wedge block 203 through the connecting plate 215; when the pressing wedge block 203 moves linearly downward, the guide corner boss 209 moves linearly along the guide slot 208, pushing the following wedge block 204 to move linearly along the limit slider 205, and under the action of the wedge-shaped inclined surface and the guide corner boss 209 and the guide slot 208, the pressing wedge block 203 and the following wedge block 204 move synchronously in opposite directions; S3, a predetermined load pressure is set in the hydraulic cylinder 224 through hydraulic oil. When the expansion joint becomes smaller, the displacement control box 107 pushes the hinge seat 217, the hinges of the first movable hinge wall 219 and the second movable hinge wall 220 are compressed, the sliding roller 221 rolls along the hinge seat 217, the two groups of hinge seats 217 approach each other, and the hydraulic cylinder 224 is compressed to absorb the load; when the expansion joint becomes larger, the action is opposite; S4. When the expansion joint becomes smaller, the displacement control box 107 pushes the lead plate 226, thereby compressing the high elastic memory rubber pad 227 to absorb load energy storage, and the elastic body 229 is deformed to cause the lead plate rubber pad mechanism 225 to be displaced. When the expansion joint becomes larger, the action is opposite; S5. The vehicle contacts the end extension guard plate 301 first, and then contacts the side beam 101; S6. When a vehicle passes through the end extension guard plate 301, the impact pressure generated is transmitted to the buffer rubber ring 303 through the hard rivet 304, and diluted to the foundation through the fixed pin sleeve 302. The buffer rubber ring 303 buffers each sudden pressure on the fixed pin sleeve 302 and absorbs its shear force. S7. When the expansion joint changes, the outer tooth plate 305 is driven by the side beam 101 to move toward the middle tooth plate 307, and relative displacement occurs between the retaining teeth 306 and the tooth plate groove 308; S8. When the expansion joint changes, the side beam 101 and the middle beam 106 are relatively displaced, thereby driving the independent tensile protection cover 309 to expand and contract; S9, the liquid flows into the water guide groove 311 through the water guide plate 310, and flows out through both ends of the water guide groove 311; Obviously, the above embodiments are merely examples for clearly explaining the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. However, these obvious changes or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.

Claims

1. An adjustable prestressed steel structure bridge expansion joint device, characterized in that: The invention comprises an expansion joint main body structure (1), wherein the expansion joint main body structure (1) comprises a side beam (101), a channel steel frame (102), a supporting upright plate (103), a fixed rib (104), a rubber strip groove (105), an intermediate beam (106), a displacement control box (107), a cross beam (108), a rubber support (109), a sliding support (110), a lateral fixed foot bar (111), and a bottom fixed foot bar (112); the side beam (101) is provided with two groups, which are symmetrically arranged on both sides of the bridge expansion joint; the side beam (101) is composed of a channel steel frame (102), a supporting upright plate (103), and a fixed rib (104); a plurality of supporting upright plates (103) are provided, which are evenly distributed on the outside of the two groups of side beams (101); the fixed rib (104) is fixedly provided on the outwardly extending end of the supporting upright plates (103); the inner opening of the channel steel frame (102) on the side where the two groups of side beams (101) are close to each other is A rubber strip groove (105) is provided, the middle beam (106) is movably arranged between the two groups of side beams (101), a plurality of displacement control boxes (107) are provided, fixedly arranged at the bottom of the side beams (101), between the supporting upright plates (103) on the same side of the side beams (101), a plurality of cross beams (108) are provided, fixedly arranged at the bottom of the middle beam (106), the rubber support (109) is fixedly arranged at the top of the inside of the displacement control box (107), the sliding support (110) is fixedly arranged at the bottom of the inside of the displacement control box (107), the middle beam (106) is movably arranged between the rubber support (109) and the sliding support (110), a lateral fixing foot bar (111) is fixedly arranged on the outer side of the displacement control box (107) away from the side beams (101), and a bottom fixing foot bar (112) is fixedly arranged at the outer bottom; A prestress adjustment mechanism (2) for applying a prestress load is fixedly arranged inside the expansion joint main body mechanism (1); An external protection mechanism (3) for protecting the expansion joint is fixedly arranged on the expansion joint main body mechanism (1).

2. The adjustable prestressed steel structure bridge expansion joint device according to claim 1, characterized in that: The prestressing force adjustment mechanism (2) comprises a wedge-shaped telescopic mechanism (201), an articulated oil pressure pre-tightening mechanism (216), a lead plate rubber pad mechanism (225), and a pre-tightening support plate (231); the pre-stressing force adjustment mechanism (2) is fixedly arranged in the displacement control box (107); the articulated oil pressure pre-tightening mechanism (216) and the lead plate rubber pad mechanism (225) are provided in a plurality of groups and are fixedly arranged on both sides of the wedge-shaped telescopic mechanism (201); the pre-tightening support plate (231) is provided in two groups and is symmetrically arranged at the ends of the articulated oil pressure pre-tightening mechanism (216) and the lead plate rubber pad mechanism (225) away from the wedge-shaped telescopic mechanism (201); one group of the pre-tightening support plates (231) is close to the inner wall of the displacement control box (107), and the other group of the pre-tightening support plates (231) is close to the end of the crossbeam (108).

3. The adjustable prestressed steel structure bridge expansion joint device according to claim 2, characterized in that: The wedge-shaped telescopic mechanism (201) comprises a guide base (202), a downward pressing wedge block (203), a following wedge block (204), a limit slider (205), a limit groove (206), an avoidance groove (207), a guide slide groove (208), a guide corner boss (209), a lifting base (210), a lifting sleeve (211), a lifting screw rod (212), an active screw rod (213), a power motor (214), and a connecting plate (215); the limit slider (205) is fixedly arranged on the guide base (202). The bottom of the downward pressing wedge block (203) is fixedly provided with an avoidance groove (207), the following wedge block (204) is provided with a limiting groove (206), the following wedge block (204) is movably arranged on the limiting slider (205) on the guide base (202) through the limiting groove (206), so that the following wedge block (204) is linearly displaced along the limiting slider (205), the following wedge block (204) is symmetrically provided with guide grooves (208) on the opposite side surfaces, the downward pressing wedge block (203 ) are symmetrically and fixedly provided with guide corner bosses (209) on two opposite side surfaces, the downward pressing wedge block (203) is movably provided above the following wedge block (204), the guide corner boss (209) is movably provided in the guide slide groove (208), the lifting base (210) is fixedly provided on the top of the downward pressing wedge block (203), the lifting sleeve (211) is fixedly provided on the lifting base (210), and the lifting screw rod (212) is movably provided in the lifting sleeve (211) through a bearing, The active screw rod (213) is movably arranged in the lifting sleeve (211) through a bearing, and is perpendicular to the lifting screw rod (212) and meshes with each other for transmission. The power motor (214) is fixedly arranged on the lifting sleeve (211), and its shaft end is fixedly connected to one end of the active screw rod (213) to transmit power. A connecting plate (215) is fixedly arranged at one end of the lifting screw rod (212) close to the follower wedge block (204), and the other end of the connecting plate (215) is fixedly connected to the follower wedge block (204).

4. The adjustable prestressed steel structure bridge expansion joint device according to claim 3, characterized in that: The articulated hydraulic pre-tightening mechanism (216) comprises an articulated seat (217), a fixed articulated wall (218), a first movable articulated wall (219), a second movable articulated wall (220), a sliding roller (221), a linkage shaft (222), a support rod (223), and an oil pressure cylinder (224); each group of the articulated hydraulic pre-tightening mechanism (216) is provided with two groups of articulated seats (217) arranged opposite to each other, and the fixed articulated walls (218) are provided with two groups, one end of which is hinged to each other, and the other end is respectively hinged to the two groups of articulated seats (217). One end of the first movable hinge wall (219) and the second movable hinge wall (220) are hinged to each other, and the other end is movably connected to the sliding roller (221); the sliding roller (221) is movably arranged on the hinge seat (217); the two groups of the first movable hinge walls (219) are fixedly connected via the linkage shaft (222); the two groups of the second movable hinge walls (220) are fixedly connected via the support rod (223); and two groups of the hydraulic cylinders (224) are provided, which are fixedly connected between the linkage shaft (222) and the support rod (223).

5. The adjustable prestressed steel structure bridge expansion joint device according to claim 4, characterized in that: The lead plate rubber pad mechanism (225) comprises a lead plate (226), a high-elasticity memory rubber pad (227), a frame (228), an elastic body (229), and a displacement groove (230); the lead plate (226) and the high-elasticity memory rubber pad (227) are alternately overlapped to form the lead plate rubber pad mechanism (225); the high-elasticity memory rubber pad (227) comprises a frame (228) arranged around the edges, a plurality of groups of elastic bodies (229) uniformly arranged in the frame (228), and displacement grooves (230) uniformly arranged between the elastic bodies (229).

6. The adjustable prestressed steel structure bridge expansion joint device according to claim 5, characterized in that: The outer protection mechanism (3) comprises an end extension guard plate (301); the outwardly extending ends of the two groups of side beams (101) are fixedly connected to the end extension guard plate (301).

7. The adjustable prestressed steel structure bridge expansion joint device according to claim 6, characterized in that: The outer protection mechanism (3) further comprises a fixing pin shaft sleeve (302), a buffer rubber ring (303), and a hard rivet (304); the fixing pin shaft sleeve (302) is evenly arranged in a plurality of groups along the direction of the end extension guard plate (301), and is fixedly embedded in the bottom of the end extension guard plate (301); the buffer rubber ring (303) is fixedly arranged in a countersunk hole provided on the end extension guard plate (301), and the end extension guard plate (301) is fixedly arranged on the fixing pin shaft sleeve (302) by means of the hard rivet (304).

8. The adjustable prestressed steel structure bridge expansion joint device according to claim 7, characterized in that: The outer protection mechanism (3) further comprises an outer tooth plate (305), retaining teeth (306), an intermediate tooth plate (307), and a tooth plate groove (308); the outer tooth plate (305) is provided with two groups, which are respectively fixedly provided on the two groups of side beams (101); the intermediate tooth plate (307) is fixedly provided on the intermediate beam (106); a plurality of groups of retaining teeth (306) are evenly provided on the outer tooth plate (305); a plurality of groups of tooth plate grooves (308) are evenly provided on the intermediate tooth plate (307); and the retaining teeth (306) and the tooth plate grooves (308) correspond to each other.

9. The adjustable prestressed steel structure bridge expansion joint device according to claim 8, characterized in that: The outer protection mechanism (3) further comprises an independent tensile protection cover (309), a water guide plate (310), and a water guide groove (311); the independent tensile protection cover (309) is provided in multiple groups, and both ends are fixedly arranged in the rubber strip groove (105) on the side beam (101) and the middle beam (106); the water guide plate (310) is provided in two groups, and is symmetrically arranged on both sides of the middle beam (106); the water guide groove (311) is provided in two groups, and is fixedly arranged on the side beam (101) and has an upper opening; the tail end of the water guide plate (310) is arranged on the upper part of the water guide groove (311).

10. The method for using the adjustable prestressed steel structure bridge expansion joint device according to claim 9, characterized in that: The steps include: S1, the prestressing force adjusting mechanism (2) adjusts the displacement of the wedge-shaped telescopic mechanism (201) relative to the inner wall of the displacement control box (107) and the end of the crossbeam (108) through temperature data information feedback, so as to stabilize the preload between the two; S2, the power motor (214) drives the lifting screw (212) to rotate through the active screw (213) to achieve up and down linear motion, thereby driving the following wedge block (204) to move up and down relative to the pressing wedge block (203) through the connecting plate (215); when the pressing wedge block (203) moves linearly downward, the guide corner boss (209) moves linearly along the guide slot (208), pushing the following wedge block (204) to move linearly along the limit slider (205), and under the action of the wedge-shaped inclined surface and the guide corner boss (209) and the guide slot (208), the pressing wedge block (203) and the following wedge block (204) move synchronously in opposite directions; S3, a predetermined load pressure is set in the oil hydraulic cylinder (224) through hydraulic oil. When the expansion joint becomes smaller, the displacement control box (107) pushes the hinge seat (217), the hinges of the first movable hinge wall (219) and the second movable hinge wall (220) are compressed, the sliding roller (221) rolls along the hinge seat (217), the two groups of hinge seats (217) approach each other, and the oil hydraulic cylinder (224) is compressed to absorb the load; when the expansion joint becomes larger, the action is opposite; S4, when the expansion joint becomes smaller, the displacement control box (107) pushes the lead plate (226), thereby compressing the high elastic memory rubber pad (227) to absorb load energy storage, and the elastic body (229) deforms to cause the lead plate rubber pad mechanism (225) to be displaced. When the expansion joint becomes larger, the action is opposite; S5, the vehicle contacts the end extension guard plate (301) first, and then contacts the side beam (101); S6. When a vehicle passes through the end extension guard plate (301), the impact pressure generated is transmitted to the buffer rubber ring (303) through the hard rivet (304) and diluted to the foundation through the fixing pin sleeve (302). The buffer rubber ring (303) buffers each sudden pressure on the fixing pin sleeve (302) and absorbs its shear force; S7. When the expansion joint changes, the outer tooth plate (305) is driven by the side beam (101) to move toward the middle tooth plate (307), and relative displacement occurs between the retaining teeth (306) and the tooth plate groove (308); S8. When the expansion joint changes, the side beam (101) and the middle beam (106) undergo relative displacement, thereby driving the independent tensile protection cover (309) to perform expansion and contraction movement; S9: The liquid flows into the water guide groove (311) through the water guide plate (310) and flows out through the two ends of the water guide groove (311).

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