Earthquake-resistant highway bridge expansion joint device

Abstract

The application relates to a post-earthquake highway bridge expansion joint device, and belongs to the technical field of bridge expansion joint devices. The expansion joint device comprises a support system, a corrugated beam system and an anchoring system, and mainly uses a corrugated beam to replace multiple steel longitudinal beams in a conventional large-displacement mode expansion joint device. The corrugated beam is formed by bending a steel plate multiple times, is an integral whole, cannot be tilted and fallen like a steel longitudinal beam in an earthquake, is convenient for rapid post-earthquake repair, and ensures rapid and smooth road traffic. The corrugated beam is convenient to manufacture and install, is covered with a rubber cover plate on the top, or after filling an elastic body on the top of a groove on the corrugated beam, a waterproof system containing a sealing rubber strip in a conventional expansion joint device can be omitted. The anchoring concrete is high-toughness concrete mixed with steel fibers, and the steel fibers close to the expansion joint are subjected to directional treatment, so that the anchoring concrete is not easy to be damaged and is effectively bonded with both sides of the corrugated beam.

Description

TECHNICAL FIELD

[0001] The application relates to a bridge expansion joint device, in particular to a highway bridge expansion joint device for keeping the road open after an earthquake. BACKGROUND

[0002] The bridge expansion joint is usually arranged between two beam ends, between a beam end and an abutment or at a hinged position of a bridge, and is used to coordinate the deformation of two sides of a bridge or the deformation of a bridge and an abutment. The bridge expansion joint device directly bears the vehicle load and transmits the load to the main beam structure and the bridge deck pavement through anchoring concrete. The bridge expansion joint device needs to be freely deformed in the longitudinal direction of the bridge and be flush with the top end of the bridge deck to ensure smooth driving of vehicles. The bridge expansion joint device is a vulnerable structure in a bridge. According to statistics of researchers, the service life of the expansion joint device is generally less than 10 years, which is far less than the design service life of the bridge.

[0003] In a large displacement expansion joint device, the modulus type expansion joint device is most commonly used. The modulus type expansion joint device is composed of a steel longitudinal beam, a sealing rubber strip, a support cross beam, a displacement box and an elastic support element. The modulus type expansion joint device has a wide deformation range and is suitable for large bridges and super-large bridges with an expansion amount of 80mm to 1200mm. The modulus type expansion joint device has the advantages of relatively large overall rigidity, relatively large activity, small resistance when deformation occurs, stable structure, time-saving and convenient installation and excellent driving comfort. Although the modulus type expansion joint device has many advantages and is widely used, the bridge construction workers do not have a deep understanding of the device. Defects may occur in the design, construction and later maintenance and management of the device, resulting in many diseases of the modulus type expansion joint device after operation, which affects the normal use and driving safety of the bridge.

[0004] The existing modulus type expansion joint device can only expand along the longitudinal direction of the bridge or road to adapt to the thermal expansion and cold contraction of the beam body. The device does not have a multidirectional displacement function and a damping and shock isolation function, and the energy dissipation and shock absorption effect is very limited. In earthquake-prone areas, the existing modulus type expansion joint device is the most easily damaged component in the bridge. When the first wave of an earthquake comes, the elastic support element may be deformed too much or damaged due to the violent vibration and displacement of the beam body on both sides of the expansion joint, resulting in misalignment or even falling off, causing the steel longitudinal beam to tilt or even slide, and the modulus type expansion joint device to be permanently damaged. The modulus type expansion joint device is not conducive to the safety of the bridge. In addition, after being subjected to the impact load of a vehicle, the longitudinal beam of the existing modulus type expansion joint device is prone to displacement, resulting in uneven joint width between the longitudinal beams, which seriously affects the driving comfort. The technical problems of multidirectional displacement, energy dissipation and shock absorption and uneven joint width of the modulus type expansion joint device have not been solved for a long time. SUMMARY

[0005] In order to overcome the shortcomings of the existing technology, this invention develops a highway bridge expansion joint device for maintaining traffic flow after an earthquake. The purpose is to provide a large displacement expansion joint device that is not easily damaged during an earthquake and is easy to repair quickly.

[0006] The technical solution proposed in this invention is a highway bridge expansion joint device for post-earthquake traffic maintenance, comprising a displacement box, a supporting beam, a support frame assembly, a corrugated beam, and an anchoring system. Its features include: the corrugated beam bearing the wheel load and transferring it to the supporting beam through the support frame assembly; the corrugated beam being formed by multiple bends of a steel plate, with each convex top having a top horizontal section and each concave bottom having a bottom horizontal section, all top horizontal sections being flush, and all bottom horizontal sections being flush; the fold lines of the corrugated beam running longitudinally along the expansion joint, and both sides of the corrugated beam being connected to the corresponding anchoring system; the anchoring system comprising anchor components and anchoring concrete.

[0007] Preferably, an elastic damping element is installed on the bottom inner side of each upward convex part of the corrugated beam, and the elastic damping element is fixedly connected to the side walls at both ends.

[0008] Preferably, each concave upper section of the corrugated beam is filled with elastic material, and a connector is welded to the side wall of the filled section. Wires are embedded in the interior of the filled section along the longitudinal direction of the expansion joint.

[0009] Preferably, each recess of the corrugated beam is equipped with a limiting bar along the longitudinal direction of the bridge; the limiting bar has a limiting block inside the recess near both sides of the web plate, and a limiting block outside the recess near both web plates, with a reserved distance between each limiting block and the corresponding side of the web plate.

[0010] Preferably, the corrugated beam has vertical stiffening ribs connected to its web to improve the compressive stability of the web.

[0011] Preferably, the outermost sections on both sides of the corrugated beam are horizontally fixed to the upper surface of the anchored concrete, and a rubber plate is fixed on the horizontal section.

[0012] Preferably, the outermost sections on both sides of the corrugated beam are horizontally fixed above the anchoring concrete, and there is a rubber pad between the horizontal section and the anchoring concrete.

[0013] Preferably, in the anchoring system, a vertical anchoring steel plate is pre-embedded in the anchoring concrete near the expansion joint, and anchoring steel wires and anchoring reinforcing bars are welded to the side wall of the anchoring steel plate on the anchoring concrete side; the extended end of the anchoring reinforcing bar has a hook; and a horizontally placed steel mesh is present in the anchoring concrete.

[0014] Preferably, the anchoring concrete in the anchoring system is high toughness concrete mixed with steel fibers; the anchoring steel wires are vertically arranged in columns, and the column spacing is between 1.5 times and 5 times the length of the steel fibers; the fibers on the top of the anchoring concrete near the anchoring steel plate are oriented in a direction tending to be along the longitudinal direction of the bridge.

[0015] Preferably, the outermost segments on both sides of the wave-shaped beam are vertical segments fixed to the outer side of the anchoring steel plate; a rubber cover plate is arranged on the wave-shaped beam; the rubber cover plate has a cavity along the longitudinal direction of the bridge, and the cavity has a sliding plate; the length of the sliding plate is less than the length of the cavity; the sliding plate is supported at both ends on the top horizontal segment of the upper convex.

[0016] The beneficial effects of the present application include the following aspects:

[0017] (1) The present application uses a wave-shaped beam to replace the multiple steel longitudinal beams in the conventional large displacement mode expansion joint device, and the wave-shaped beam is a whole, which is convenient for installation and quick repair, can ensure that the wave-shaped beam does not fall and slide like the steel longitudinal beam in an earthquake, and can be quickly repaired after the earthquake to ensure the rapid and smooth traffic of the road;

[0018] (2) The wave-shaped beam is made by bending a steel plate, and has simple structure and lower manufacturing cost compared with special-shaped steel; the stiffening ribs welded on the web are beneficial to improve the compression stability of the wave-shaped beam;

[0019] (3) The present application basically does not change the connection form between each component system and each component system of the conventional modular expansion joint device, which is convenient for fully utilizing the existing component system for assembly, and also convenient for modifying the existing modular expansion joint device;

[0020] (4) The elastic damping element in the present application can ensure that the transverse displacement of the wave-shaped beam is uniform and consistent when the expansion joint is elongated or shortened, and can also enhance the stability of the wave-shaped beam when subjected to wheel load;

[0021] (5) The filled segment of the lower recess in the present application can avoid rainwater leakage and dust falling into the recess groove of the lower recess, and the filled segment is also convenient for quick repair; the filled segment is provided with a connecting piece, which can enhance the adhesion between the filled material and the groove wall; a longitudinal wire is embedded in the filled segment, which can enhance the integrity of the filled segment;

[0022] (6) The setting of the limiting rib and the corresponding stop block in the present application can limit the opening size of the lower recess, and avoid damage to the wave-shaped beam under the action of an overloaded vehicle load;

[0023] (7) The present application is provided with horizontal section on both sides of the corrugated beam, and rubber pad is placed on or under the horizontal section, which is helpful to reduce the impact of the vehicle on the expansion joint device, including reducing the damage and destruction to the anchoring concrete;

[0024] (8) The present application is provided with rubber cover plate on the corrugated beam, and only thicker rubber cover plate needs to be replaced when asphalt layer is added in the future, which is convenient for maintenance and repair;

[0025] (9) The anchoring concrete adopts high-toughness concrete mixed with steel fibers, which has high tensile strength and crack resistance, and the steel mesh is also placed in the anchoring concrete, which can effectively resist the impact of vehicle load without breaking and loosening;

[0026] (10) The directional operation of steel fibers in the area where high-strength steel wires are located and the adjacent area can make the steel fibers directional, and also increase the relative unit volume content of steel fibers in the area where high-strength steel wires are located. Together with the high-strength steel wires welded on the upper end of the anchoring steel plate, it can ensure the effective bonding of the anchoring concrete and the anchoring steel plate, so that they are not easy to debond, crack and damage;

[0027] (11) The present application can reduce the vibration of the expansion joint device, reduce the driving noise, and ensure the smooth and no-jump passing of the vehicle through the corrugated beam design, rubber pad, filling section and elastic damping element. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Schematic diagram of the expansion joint device of Example 1;

[0029] Figure 2 Figure 1 Partial enlarged schematic view of A;

[0030] Figure 3 Figure 1 Partial enlarged schematic view of B;

[0031] Figure 4 Figure 1 Partial enlarged schematic view of C;

[0032] Figure 5 Figure 1 Side view schematic view of D in the direction of D;

[0033] Figure 6 Side view schematic view of the anchoring concrete side of the anchoring steel plate;

[0034] Figure 7 Distribution of steel fibers near the anchoring steel plate from the top view schematic view;

[0035] Figure 8 Schematic diagram of the corrugated beam and its components in Example 1;

[0036] Figure 9 Rubber-filled zigzag beam and its assembly in Example 1;

[0037] Figure 10 Zigzag beam and its assembly in Example 2;

[0038] Figure 11 Zigzag beam and its assembly in Example 3;

[0039] Figure 12 Expansion joint device in Example 4;

[0040] Figure 13 Zigzag beam and its assembly in Example 4;

[0041] Figure 14 Expansion joint device in Example 5;

[0042] Figure 15 Zigzag beam and its assembly in Example 5;

[0043] Figure 16 Expansion joint device in Example 6;

[0044] Figure 17 Distribution of sliding plates in cover plate in Example 6;

[0045] Figure 18 Expansion joint device in Example 7;

[0046] Figure 19 Figure 18 Side structure in E-E direction.

[0047] In the figure: beam body 1, anchoring concrete 2, paving layer 3, asphalt layer 4, displacement box 5, zigzag beam 6, filled rubber 7, anchoring steel bar 8, embedded screw 9, high-strength steel wire 10, support crossbeam 11, middle rubber shock-absorbing block 12, side rubber shock-absorbing block 121, rubber plate 13, filling bar 14, anchoring steel plate 15, embedded nut 16, filling connecting bar 17, connecting head 18, steel backing plate 19, sliding plate 20, pressing block 21, pressure-bearing block 22, support frame 23, pin shaft 24, steel fiber 25, pressing nut 26, limiting nut 27, limiting screw 28, arc-shaped plate 29, rubber cover plate 30, cavity 31, sliding plate 32, stiffening rib 33, rubber backing plate 34. DETAILED DESCRIPTION

[0048] Example 1

[0049] The bridge in this embodiment is a multi-span continuous concrete beam bridge with a main beam made of concrete box girder. The design expansion joint is 400mm wide and the required expansion amount is 180mm. Figure 1 This is a cross-sectional schematic diagram of the expansion joint device designed according to the present invention. Figure 2 , Figure 3 and Figure 4 They are respectively Figure 1 Enlarged schematic diagrams of parts A, B, and C in the diagram. Figure 5 for Figure 1 A schematic diagram of the side structure in the D-D direction. The beam 1 has a pre-reserved groove at its end containing an upward-extending portal-shaped steel bar (not shown). The groove is surrounded by a pavement layer 3 and an asphalt layer 4. The expansion joint device is symmetrically arranged about the expansion joint and includes a displacement box 5, a supporting beam 11, a support frame assembly, a corrugated beam 6, and an anchoring system. The support frame assembly includes a support frame 23, a clamping block 21, and a bearing block 22. The latter two abut against sliding plates 20 on the upper and lower surfaces of the supporting beam 11, respectively. The tightness of the abutment is adjusted by a pin 24. The corrugated beam 6 is welded to the support frame 23. The anchoring system mainly includes anchoring concrete 2, anchoring steel plates 15, and anchoring steel bars 8 and high-strength steel wires 10 welded to the sides of the latter. See... Figure 6 As shown, the spacing between adjacent anchor wires 10 is 6cm, and the horizontal distance between adjacent anchor bars 8 is 30cm; the anchor bars 8 are ribbed bars with a diameter of 14mm, and the ends away from the expansion joint have end hooks; the anchor wires 10 are straight 3.0mm indented anchor wires with a length of 40mm. The steel fibers 25 in the anchoring concrete 2 near the anchor wires 10 are oriented, tending to be perpendicular to the anchor plate 15, as shown in the diagram. Figure 7 The steel fiber 25 is a straight steel fiber with a circular cross-section, 30mm in length and 0.4mm in diameter. When the anchoring concrete 2 is poured to 50mm from its design height, pouring is paused. After the surface is leveled, a steel strip with a thickness of 1mm and a width of 40mm is inserted into the anchoring concrete 2 near the anchoring steel plate 15 and moved longitudinally along the bridge. This is done from one end of the expansion joint to the other, at 30mm intervals, and the movement should be rapid to avoid large movements of the steel fiber 25 along the bridge's longitudinal direction. Then, the reinforcing mesh is placed horizontally, and the remaining anchoring concrete 2 is poured.

[0050] The corrugated beam 6 bears the wheel load and transfers it to the supporting crossbeam 11 through the support frame assembly. The corrugated beam 6 is formed by multiple bends of steel plate, with a height of 200mm. Each convex top has a top horizontal section, and each concave bottom has a bottom horizontal section. All top horizontal sections are flush, and all bottom horizontal sections are flush. (See...) Figure 8The net distance of the two web plates of each upper convex or lower concave is 60 mm, and the thickness of the steel plate is 10 mm. The components of the corrugated beam 6 include an arc plate 29 in the middle of the lower concave and a filling connecting rib 17 welded on the inner side wall of the lower concave. The arc plate 29 is a steel plate with a thickness of 0.6 mm, which is pasted on the inner wall of the web plate by structural adhesive. The longitudinal filling rib 14 is arranged in the filling section, which is a steel bar with a diameter of 10 mm. The filling rubber 7 is injected by placing a formwork on the top of the lower concave, which is a butadiene styrene rubber, as shown in Figure 9 .

[0051] The outermost section of the two sides of the corrugated beam 6 is a horizontal section, and the upper surface of the horizontal section is 30 mm lower than the top horizontal section of the corrugated beam 6. Accordingly, after the corrugated beam 6 is fixed on the anchoring concrete 2 by the compression nut 26 and the embedded screw rod 9 on both sides of the corrugated beam 6, a 30 mm thick rubber plate 13 is laid on the upper surface. On the anchoring concrete 2 that is not covered by the horizontal section of the corrugated beam 6, a steel pad 19 with a thickness of 10 mm is placed. Through the openings on the rubber plate 13 and the steel pad 19, the internally threaded connecting head 18 is screwed in to connect the embedded screw rod 9, which is fixed with multiple embedded nuts 16 to enhance the anchoring effect.

[0052] The corrugated beam 6 is installed with elastic damping elements, including a middle rubber shock-absorbing block 12 installed on the inner side of the bottom of each upper convex, and a side rubber shock-absorbing block 121 installed between the outer side of the corrugated beam 6 and the anchoring steel plate 15 on both sides. After the installation of the elastic damping elements, they are in a compressed state.

[0053] The anchoring concrete 2 is a fast-hardening and slow-setting high-toughness steel fiber concrete mixed with steel fibers 25. The fast-hardening and slow-setting high-toughness steel fiber concrete used meets three main technical indicators: (1) the 4-hour cubic compressive strength reaches 40 MPa; (2) the initial setting time of the concrete is not less than 0.5 hours; (3) the bending toughness index of the concrete reaches: I5≥6.0, I 10 ≥12.0, I 20 ≥23.0. The mix proportion of the fast-hardening and slow-setting high-toughness steel fiber concrete is shown in Table 1, and the design parameters are shown in Table 2. The concrete has good fluidity and can be cast without vibration in a narrow space. The finishing work should also be accelerated. The concrete is mixed on site using small equipment, and is poured immediately after mixing. The mixing process includes:

[0054] (1) Dry mix fast-hardening cement, Portland cement (52.5R), silica fume, slag, and quartz sand, and mix and stir for 2 minutes;

[0055] (2) Dissolve the water-reducing agent and the setting retarder in water and stir to ensure that the setting retarder is fully dissolved in water;

[0056] (3) Add water, water-reducing agent, and setting retarder to the mixer at the same time and stir for 4 minutes;

[0057] (4) After the concrete is discharged, the steel fibers are put in while stirring, and the process lasts 1 min.

[0058] Table 1 Mix proportion of the fast-hardening and slow-setting high-toughness steel fiber concrete in the example (kg of each material per cubic volume)

[0059]

[0060] Table 2 Design parameters of the fast-hardening and slow-setting high-toughness steel fiber concrete

[0061]

[0062] Example 2

[0063] This example is a modification of Example 1, and mainly a limiting structure is added to the corrugated beam 6 to ensure that it will not lose stability under the action of an overloaded vehicle, as shown in Figure 10 Each of the concave portions of the corrugated beam 6 is provided with a transverse limiting screw 28; each limiting screw 28 is 120 mm long and is sleeved with four limiting nuts 27.

[0064] Example 3

[0065] This example is a modification of Example 2, as shown in Figure 11 The only difference from Example 2 is that the arc-shaped plate 29 is bent downward. In order to facilitate the bonding operation of the arc-shaped plate 29 and the web, the arc-shaped plate 29 is in tension when the filling section is made, so that buckling of the arc-shaped plate 29 during the manufacturing process can be avoided.

[0066] Example 4

[0067] This example is a modification of Example 1, as shown in Figure 12 and Figure 13 The main difference from Example 1 is that the outermost sections of the corrugated beam 6 on both sides are horizontal sections, and the horizontal sections are level with the top horizontal sections of the respective convex portions. The horizontal sections of the corrugated beam 6 on both sides are fixed above the anchoring concrete 2, and there is a rubber pad 34 between the horizontal sections and the anchoring concrete 2.

[0068] Example 5

[0069] This example is a modification of Example 1, as shown in Figure 14 and Figure 15The main difference compared with Example 1 is the form of the corrugated beam 6 and the resulting change in the mounting structure. The corresponding expansion joint width is 500 mm. The outermost segments on both sides of the corrugated beam 6 are vertical segments whose upper ends are level with the top horizontal segments of the upper convexity and are fixed to the outer side of the anchoring steel plate 15; the upper surface of the anchoring concrete 2 is level with the upper surface of the asphalt layer 4. The left-hand lower concavity in this example is fixedly connected to the support cross beam 11 by means of a backing plate, and correspondingly the support cross beam 11 is a fixed end in the left-hand displacement box 5.

[0070] Example 6

[0071] This example is a modification of Example 5, see Figure 16 and Figure 17 The main difference is that the top surface of the corrugated beam 6 is 50 mm lower than the upper surface of the asphalt layer 4, and a rubber cover plate 30 is placed on the corrugated beam 6. The rubber cover plate 30 is 50 mm high and has cavities 31 along the longitudinal direction of the bridge, with a length of 150 mm, a width of 50 mm and a height of 35 mm; the cavities 31 have sliding plates 32 inside, with a length of 110 mm, a width of 50 mm and a height of 35 mm. The sliding plates 32 span the grooves of the lower concavities of the corrugated beam 6 and are supported at both ends on the two top horizontal segments adjacent to the grooves of the lower concavities, transmitting the vehicle load to the two top horizontal segments. Along the longitudinal direction of the expansion joint device, the cavities 31 corresponding to each lower concavity are arranged at equal intervals, with a net spacing of 150 mm; the cavities 31 of adjacent lower concavities are staggered. This arrangement can be matched with the width of the wheel, which is 600 mm, to transmit the wheel load. At the same time, the two side ends of the rubber cover plate 30 are chemically glued to the upper surface of the anchoring concrete 2, which can play a waterproof role.

[0072] Example 7

[0073] This example is a modification of Example 6, see Figure 18 and Figure 19 The main difference is that the corrugated beam 6 is provided with a limiting structure similar to that in Example 3. Vertical stiffening ribs 33 are welded to the outer side of the web of the lower concavity of the corrugated beam 6 to improve the compression stability of the web.

[0074] The specific construction steps are as follows:

[0075] After the beam body 1 is installed, the formwork is erected and the pavement layer 3 is poured; then, wooden boards and strips are filled into the installation pit slots of the expansion joint device, and the asphalt layer 4 is constructed along the entire route; the asphalt layer 4 at the installation pit slots is cut, and the installation pit slots are cleaned and roughened;

[0076] Step 2 Install multiple times watering in the pit, to achieve the wet surface dry; In the support beam 11 in the cooperation of the installation of displacement box 5 and anchor steel plate 15, the side of the anchor steel plate 15 has been welded anchor steel bar 8 and high strength steel wire 10; Start pouring high toughness fiber reinforced concrete, at the position of 100mm and 30mm from the upper surface of the anchor concrete 2, put two layers of steel mesh in turn, close to the anchor steel plate 15 side, within the range of 300mm from the anchor steel plate 15, the steel mesh has no steel bar parallel to the expansion joint; After pouring, install the art knife blade at the front end of the small vibrating rod, and slide within the range of 150mm in the depth of the concrete surface layer within the range of 300mm from the anchor steel plate 15, the sliding direction is perpendicular to the anchor steel plate 15, work from one end to the other end of the expansion joint device, the interval is 40mm, when encountering the steel bar of the steel mesh, anchor steel wire 10 or anchor steel bar 8, appropriately avoid, so that the steel fiber 25 is directional; Then use the flat plate vibrator to vibrate the surface of the anchor concrete 2;

[0077] Step 3 Fine adjustment of support beam 11, installation of sliding plate 20, pressing block 21, pressure block 22, support frame 23, installation and pre-tightening of pin shaft 24;

[0078] Step 4 Make wave beam 6, weld filling connecting bar 17, install limiting screw 28, and paste arc plate 29;

[0079] Step 5 Install wave beam 6, close to the lower concave pad steel pad plate of the fixed end of support beam 11; Fine adjustment makes the bottom of wave beam 6 flush; The two sides of wave beam 6 are connected with anchor steel plate 15; Install elastic damping element; Pour filling rubber into the downward concave groove;

[0080] Step 6 Make rubber cover plate 30; Use chemical glue to paste the two side ends of rubber cover plate 30 with the upper surface of anchor concrete 2.

Claims

1. A post-earthquake access-keeping highway bridge expansion joint device comprising a displacement box, a support beam, a support frame assembly, a corrugated beam and an anchoring system, characterized in that: The corrugated beam bears the wheel load and transmits it to the support beam through the support frame assembly; the corrugated beam is formed by bending a steel plate multiple times, each upper convex top has a top horizontal section, and each lower concave bottom has a bottom horizontal section, all the top horizontal sections are flush, and all the bottom horizontal sections are flush; the corrugated beam has a fold line extending along the longitudinal direction of the expansion joint, and both sides of the corrugated beam are connected with the anchoring system of the corresponding side; the anchoring system comprises an anchoring assembly and anchoring concrete; the corrugated beam assembly comprises an arc-shaped plate located in the middle of the lower concave and a filling connecting rib welded to the inner side wall of the lower concave; an elastic damping element is mounted on the inner side bottom of each upper convex of the corrugated beam, and the elastic damping element is fixedly connected with the side walls at both ends thereof; an elastic material is filled in the upper section of each lower concave of the corrugated beam, a connecting piece is welded to the side wall of the filling section, and a filling rib is embedded in the interior of the filling section along the longitudinal direction of the expansion joint; a limiting screw rod along the longitudinal direction of the bridge is mounted on each lower concave of the corrugated beam; the limiting screw rod has a limiting stopper near the web plate on both sides in the interior of the lower concave, and a limiting stopper near the web plate on both sides outside the lower concave, and each limiting stopper has a distance allowance on the side face of the corresponding web plate.

2. The post-earthquake traffic maintenance highway bridge expansion joint device according to claim 1, characterized in that: A vertical stiffening rib is connected to the web plate of the corrugated beam to improve the compression stability of the web plate.

3. The post-earthquake traffic maintenance highway bridge expansion joint device according to claim 1, characterized in that: The outermost horizontal sections of the corrugated beam on both sides are horizontally fixed to the upper surface of the anchoring concrete, and a rubber plate is fixed to the horizontal section.

4. The post-earthquake traffic maintenance highway bridge expansion joint device according to claim 1, characterized in that: The outermost horizontal sections of the corrugated beam on both sides are horizontally fixed above the anchoring concrete, and there is a rubber pad plate between the horizontal section and the anchoring concrete.

5. The post-earthquake access maintained highway bridge joint device according to claim 1, characterized in that: The anchoring concrete in the anchoring system has a vertical anchoring steel plate embedded near the expansion joint side, and anchoring steel wires and anchoring steel bars are welded to the side wall of the anchoring steel plate on the side of the anchoring concrete; the protruding end of the anchoring steel bar has a hook; the anchoring concrete has a horizontally placed steel mesh.

6. The post-earthquake access maintained highway bridge joint device according to claim 5, characterized in that: The anchoring concrete in the anchoring system is high-toughness concrete mixed with steel fibers; the anchoring steel wires are vertically arranged in rows, and the row spacing is between 1.5 times and 5 times the length of the steel fibers; the fibers near the top of the anchoring concrete tend to be oriented along the longitudinal direction of the bridge.

7. The post-earthquake access maintained highway bridge joint device according to claim 6, characterized in that: The outermost vertical sections of the corrugated beam on both sides are fixed to the outer side of the anchoring steel plate; the corrugated beam is provided with a rubber cover plate; the rubber cover plate has a cavity along the longitudinal direction of the bridge, and a sliding plate is arranged in the cavity; the length of the sliding plate is less than the length of the cavity; the sliding plate spans the lower concave of the corrugated beam, and both ends of the sliding plate are supported on the top horizontal section of the upper convex. ​ ​

Images