Bridge expansion joint device

Abstract

The utility model belongs to the technical field of bridge expansion joints, and particularly relates to an anti-fatigue bridge expansion joint device with high durability, which mainly structurally comprises two rows of embedded steel bars arranged in an expansion joint mounting groove, F-shaped steel arranged between the embedded steel bars, rubber strips connected with the F-shaped steel, and bending bolts connected with the F-shaped steel, the bending bolts can reduce the descending speed of steel-concrete interface shear rigidity and prolong the fatigue life, zero welding can be achieved, the anchoring performance between the bridge expansion joint device and anchoring concrete can be improved, meanwhile, shear force and drawing force brought by vehicle loads can be borne, the supporting effect on the bridge expansion joint device is achieved, and the bridge expansion joint device can be applied to the bridge expansion joint device. The bridge expansion joint device can be directly placed on bridge main body concrete, site construction and installation are easy, the installation position of the bending bolt is convenient to adjust and only needs to be adjusted through the nut, and the problem that the expansion joint device cannot be adjusted according to the actual grooving condition on the construction site to adapt to the actual grooving error is solved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to bridge expansion joint technical field relates to a kind of fatigue-resistant bridge expansion joint device with high durability, suitable for coastal area. BACKGROUND

[0002] Expansion joint is an important accessory structure, set between beam end or beam end and abutment, the role is to meet the deformation of bridge due to temperature change, concrete shrinkage and creep, vehicle load and reduce the secondary stress of upper structure caused by uneven settlement. The design service life of bridge structure expansion joint is mostly 15 years, however, under the reciprocating action of vehicle load and the influence of complex service environment, its actual service life is far lower than design service life, often needs to be replaced after several years of operation, increases operation and maintenance cost, seriously affects driving comfort, and there is also a greater security risk. For bridge expansion joint served in the complex service conditions of coastal area, the erosion effect of chloride ions in air and seawater poses a more serious threat to its performance and working life.

[0003] Bridge structure has structural "discontinuity" characteristics at expansion joint position, compared with other components of bridge structure, expansion joint bears greater local impact, under the reciprocating action of vehicle load, the fatigue damage problem of bridge expansion joint is prominent, common diseases concentrate on: (1) concrete damage of anchoring area; (2) fatigue cracking of expansion joint main body steel structure welding;

[0004] (3) under the complex service conditions of coastal area, the erosion of chloride ions in air and seawater to concrete and steel structure seriously affects the durability of bridge expansion joint.

[0005] At present, ordinary concrete or steel fiber doped UHPC material is mostly used for expansion joint anchoring area concrete, for bridge expansion joint in coastal area, the strength of ordinary concrete is relatively low, and cracking problem easily occurs under the action of vehicle load, while steel fiber doped UHPC, the erosion of chloride ions in seawater and air easily leads to corrosion of steel fiber inside UHPC and steel structure, reduces the durability of bridge structure, aggravates the degree of mechanical property degradation of bridge expansion joint, and seriously affects the performance of bridge structure.

[0006] Fatigue cracking of expansion joint main body steel structure welding appears as follows: under the reciprocating action of vehicle load, the welding initial defect generated in welding process evolves into macro fatigue crack, with the increase of vehicle load action times, fatigue crack gradually expands until remaining section is insufficient to bear fatigue fracture, and then threatens the use safety of bridge structure.

[0007] The bridge expansion joint structure in the prior art is complex, often needs to be welded, has a long maintenance and replacement time, and cannot be adjusted according to the actual construction situation during on-site installation. The expansion joint structure and the anchoring area concrete are easily corroded in the complex service environment of the coastal area, and are not suitable for the coastal area. For example, a seamless expansion joint structure for a bridge pavement structure disclosed in Chinese Patent 202410906967.X includes a bridge, a steel cover top plate, a composite paving device, and a polymer elastic device. The bridge includes a bridge deck main body, and a recess gap is arranged between the bridge deck main bodies. The polymer elastic device is installed in a narrow gap in the lower half of the recess gap. A steel cover bottom plate is connected to the upper surface of the polymer elastic device. The composite paving device is connected to the upper surface of the steel cover bottom plate. The composite paving device is tightly attached to the opposite sides of the bridge deck main body on the left and right sides. A steel cover top plate is connected to the upper surface of the composite paving device at the middle position of the upper surface of the composite paving device. The steel cover top plate includes a top plate surface, a square groove is formed in the middle of the top plate surface, a pressure detection plate is connected to the square groove of the top plate surface, a pressure detector is connected to the lower end of the pressure detection plate, the pressure detector is fixedly connected to the upper surface of the composite paving device, reinforcing test devices are connected to the front and rear sides of the top plate surface, and the reinforcing test devices include a solar main plate, shafts are connected to the left and right sides of the solar main plate, laser perforations are formed at the left and right end positions of the surface of the solar main plate, a laser emitter is fixedly installed at the laser perforation of the front solar main plate, a laser receiver is fixedly installed at the laser perforation of the rear solar main plate, and the laser emitter, the laser receiver, and the left and right sides of the composite paving device are on the same horizontal line. A reset type bridge expansion joint device disclosed in Chinese Patent 202410844697.4 includes expansion joint channel steels, a sealing rubber strip is arranged at the top between the two expansion joint channel steels, a plurality of anchoring steels are uniformly arranged on the outer sides of the expansion joint channel steels, a limiting mechanism for limiting the anchoring steels is arranged in the interior of the expansion joint channel steels; a reset mechanism for the spacing between the two expansion joint channel steels is arranged at the bottom of the sealing rubber strip between the two expansion joint channel steels, U-shaped moving plates are fixedly arranged on the outer sides of the bottoms of the expansion joint channel steels, a bottom transverse plate is slidably connected between the two U-shaped moving plates, a rectangular sliding plate is arranged at the end of the U-shaped moving plate close to the bottom transverse plate and in the interior of the bottom transverse plate, a rectangular sliding groove is formed in the interior of the bottom transverse plate, and the bottom transverse plate and the U-shaped moving plate are slidably connected through the cooperation of the rectangular sliding groove and the rectangular sliding plate. The limiting mechanism includes a circular mounting block, the circular mounting block is fixedly arranged at the end of the anchoring steel close to the expansion joint channel steel, the circular mounting block is slidably connected to the interior of the expansion joint channel steel, a vertical limiting column is slidably connected to the interior of the expansion joint channel steel, a rectangular connecting block is fixedly arranged at the top of the vertical limiting column, a horizontal limiting column is slidably arranged in the interior of the rectangular connecting block, a circular pull block is fixedly arranged at the end of the horizontal limiting column, and a second rigid spring is arranged between the circular pull block and the expansion joint channel steel and on the outer side of the horizontal limiting column.A kind of expansion joint device of fabricated bridge disclosed in Chinese patent 202410740032.9, including abutment embedded part, embedded in concrete abutment;Abutment connecting prefabricated part is connected with abutment embedded part by first fastener, abutment connecting prefabricated part is provided with first sleeve, first sleeve is vertically arranged;Steel-concrete beam connecting prefabricated part is connected with steel-concrete beam by second fastener, steel-concrete beam connecting prefabricated part is provided with second sleeve, second sleeve is vertically arranged;Water stop device is arranged between abutment connecting prefabricated part and steel-concrete beam connecting prefabricated part;Comb plate is provided with mounting hole, mounting hole is connected with first sleeve, second sleeve by third fastener;Sealant is filled between comb plate and abutment connecting prefabricated part and comb plate and steel-concrete beam connecting prefabricated part, further including heightening backing plate, it is arranged between abutment connecting prefabricated part and comb plate, and / or.

[0008] Or, it is arranged between steel-concrete beam connecting prefabricated part and comb plate, further including vibration reduction and noise reduction support, it is arranged between abutment connecting prefabricated part and comb plate and / or steel-concrete beam connecting prefabricated part and comb plate. A kind of expansion joint structure for road bridge construction disclosed in Chinese patent 202410664657.1, including pavement and beam body, the end of beam body is provided with beam end joint, the lower side of pavement is equipped with leveling layer, leveling layer is equipped above beam body, and pavement, leveling layer and beam body are in turn from top to bottom, the upper end of the side close to beam end joint of pavement and leveling layer is commonly provided with deck joint, and the direction of beam end joint in each group towards deck joint is driving direction, deck joint is filled with rubber particles, the outside of rubber particles is covered with water-permeable geotextile layer, water-permeable geotextile layer is filled to the side of deck joint and is bonded;The lower surface of the leveling layer corresponding to beam end joint and close to beam body is provided with steel sealing plate, the lower surface of the end close to deck joint of steel sealing plate is provided with silicone oil layer, the middle part of leveling layer is provided with interval distribution layered gap, and the end of reinforcement mesh is extended to the edge side of deck joint;The lower side of beam body corresponding to deck joint is provided with a plurality of water pipes, the upper end of water pipe is in contact with water-permeable geotextile layer, and the lower end is flush with the bottom of beam body. Therefore, a kind of high durability, anti-fatigue bridge expansion joint suitable for coastal area is developed and designed, solve the problem of chloride ion erosion of steel fiber and steel structure under the complex service environment of coastal area, improve the durability of bridge expansion joint. SUMMARY

[0009] The utility model aims at the problems existing in the prior art, and develops and designs a kind of high durability, anti-fatigue bridge expansion joint for coastal area.

[0010] To achieve the above-mentioned purpose, the main structure of a kind of bridge expansion joint device of the utility model as Fig. 1-2 Shown, including two rows of embedded steel bars arranged in expansion joint installation groove, embedded steel bars are provided with as Fig. 3The F-shaped steel, the rubber strip connected with the F-shaped steel, and the bent bolt connected with the F-shaped steel are shown in the figure.

[0011] The expansion joint installation groove is arranged between the beam ends or between the beam ends and the abutments.

[0012] The two rows of embedded steel bars are parallel to each other, and the spacing between the front and rear embedded steel bars in each row is equal.

[0013] The F-shaped steel is arranged between the embedded steel bars and is mirror-symmetric, and a bolt mounting hole is arranged at the lower part.

[0014] The rubber strip is arranged in the cavity of the F-shaped steel.

[0015] The bent bolt is arranged in the bolt mounting hole and is connected with the F-shaped steel through a nut.

[0016] The anchoring concrete inside the expansion joint installation groove is an ultra-high performance concrete (UHPC) mixed with polyethylene fiber (PE fiber).

[0017] The embedded steel bar and the bent bolt have a certain spacing, and the welding work of the expansion joint device and the embedded steel bar at the construction site is cancelled, so that zero welding at the construction site is ensured.

[0018] The material of the F-shaped steel is weathering steel, so that the exposed steel is more corrosion-resistant.

[0019] The middle part of the rubber strip is in a V-shaped structure, which can prevent water and other impurities from entering the expansion joint, and the end part is in a hammer-shaped structure and is clamped in the cavity of the F-shaped steel and is not easy to fall out.

[0020] The structure of the bolt mounting hole includes a circle and a rectangle, when the bolt mounting hole is in a circle shape, the installation position of the bent bolt is fixed, and when the bolt mounting hole is in a rectangle shape, the installation position of the bent bolt is not fixed and is adjusted up and down according to the depth of the expansion joint installation groove.

[0021] The bent bolt is a single-folded bent bolt as shown in the figure. Fig. 4 Compared with ML15, the shear bearing capacity of the Q690 high-strength steel bolt in the UHPC is greatly improved, and the fatigue strength of the Q690 high-strength steel-UHPC shear connection under the fatigue load is more than 70% higher than that of the ordinary strength steel-ordinary concrete shear connection.

[0022] The nut is arranged on the inner and outer sides of the bolt mounting hole, and the bent bolt is fixed to be tightly connected with the F-shaped steel.

[0023] The bridge expansion joint device of the utility model relates to a cold connection of F-shaped steel and a bent bolt through bolt connection, which replaces the traditional welding connection mode, and meanwhile, the bent bolt and the embedded steel bar are staggered by a certain interval during construction, so that the whole process of the bridge expansion joint device is realized "zero welding", the welding work of Q690 high-strength steel and the steel beam is not easy to progress, the bolt connection not only avoids the welding initial defects and initial cracks generated in the welding process, but also greatly improves the fatigue resistance of the bridge expansion joint device under the reciprocating action of the vehicle load, and reduces the manufacturing difficulty and labor intensity of the bridge expansion joint device.

[0024] The anchoring concrete of the utility model is UHPC mixed with PE fibers, compared with UHPC mixed with steel fibers, can effectively prevent the corrosion of chloride ions to the internal fibers of the anchoring concrete when the concrete produces tiny cracks, and is more suitable for coastal and riverside areas.

[0025] The mix proportion (kg / m 3 ) of the anchoring concrete is as follows:

[0026] Cement Fly ash Active admixture Sand Water Water reducing agent PE fiber 600 350 60 1100 150 30 20

[0027] The construction process of the bridge expansion joint device of the utility model comprises the following steps:

[0028] Firstly, a expansion joint installation groove of a certain size is dug between the beam ends or between the beam ends and the abutments where the expansion joint is arranged;

[0029] Then, the installation position of the bent bolt in the bolt installation hole is determined according to the opening height of the expansion joint installation groove, the bent bolt is installed on the F-shaped steel through a nut, then the expansion device is placed in the expansion joint installation groove, the bent bolt is transversely staggered with the embedded steel bar, and the installation position of the bent bolt in the bolt installation hole is fine-tuned according to the actual slotting condition of the expansion joint installation groove, so that the installation of the bridge expansion joint device is adjusted on site to adapt to the partial height deviation of the actual slotting of the installation groove.

[0030] Finally, the anchoring concrete is poured in the expansion joint installation groove, and after the anchoring concrete reaches a certain strength, the rubber strip is inserted into the cavity of the F-shaped steel.

[0031] The opening position of the bolt installation hole is adjusted according to the height of the bridge expansion joint device to ensure that the bridge expansion joint device is flush with the bridge deck.

[0032] Compared with existing technologies, this invention, by casting UHPC incorporating PE fibers into the installation groove, significantly improves the strength, crack resistance, and durability compared to ordinary concrete. Replacing traditional steel fibers in UHPC with PE fibers avoids corrosion from seawater and chloride ions in the air, making it more suitable for complex coastal service environments. The bending bolts, made of Q690 high-strength steel, reduce the rate of decrease in shear stiffness at the steel-concrete interface compared to ordinary steel, improving fatigue life. Furthermore, it achieves zero welding, increases the anchoring performance between the bridge expansion joint device and the anchoring concrete, withstands shear and pull-out forces from vehicle loads, and provides support for the bridge expansion joint device. This allows the bridge expansion joint device to be placed directly on the main concrete of the bridge, facilitating on-site construction and installation. The installation position of the bending bolts is easily adjustable via nuts, solving the problem of not being able to adjust the expansion joint device to accommodate actual groove errors on-site. Its simple structure, easy on-site installation (no welding required), low construction intensity, short construction time, and high efficiency make it highly efficient. Attached image description:

[0033] Fig. 1 This is a schematic diagram of the main structure of this utility model.

[0034] Fig. 2 This is a partial schematic diagram of the main structure of this utility model.

[0035] Fig. 3 This is a schematic diagram of the main structure of the F-shaped steel involved in this utility model.

[0036] Fig. 4 This is a schematic diagram of the main structure of the bent bolt involved in this utility model. Detailed implementation method:

[0037] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0038] Example 1:

[0039] The main structure of a bridge expansion joint device according to this embodiment includes an expansion joint installation groove 1, pre-embedded steel bars 2, F-shaped steel bars 3, rubber strips 4, bolt mounting holes 5, bent bolts 6, and nuts 7. Two rows of pre-embedded steel bars 2 are arranged in the expansion joint installation groove 1 between beam ends or between beam ends and abutments. Mirror-symmetrical F-shaped steel bars 3 are arranged between the two rows of pre-embedded steel bars 2. The cavities of the F-shaped steel bars 3 are connected by rubber strips 4. Circular bolt mounting holes 5 are provided at the bottom. Bent bolts 6 are arranged in the bolt mounting holes 5. The F-shaped steel bars 3 and the bent bolts 6 are connected by bolt mounting holes 5 and nuts 7.

[0040] Example 2:

[0041] The main structure of a bridge expansion joint device according to the embodiment is shown in Fig. 1 Fig. 1, which comprises an expansion joint installation groove 1, embedded steel bars 2, F-shaped steel 3, rubber strips 4, bolt installation holes 5, bent bolts 6 and nuts 7. Two rows of embedded steel bars 2 are arranged in parallel in the expansion joint installation groove 1 between beam ends or between beam ends and abutments, and mirror-symmetrical F-shaped steel 3 is arranged between the two rows of embedded steel bars 2. The cavities of the F-shaped steel 3 are connected through the rubber strips 4. The lower part is provided with rectangular bolt installation holes 5, and the bent bolts 6 are arranged in the bolt installation holes 5. The bolt installation holes 5 and the bent bolts 6 are connected through the nuts 7.

[0042] The height of the bridge expansion joint device according to the embodiment is adjusted by adjusting the installation height of the bent bolts 6.

[0043] Embodiment 3:

[0044] The main structure of a bridge expansion joint device according to the embodiment is shown in Fig. 1 Fig. 1, which comprises an expansion joint installation groove 1, embedded steel bars 2, F-shaped steel 3, rubber strips 4, bolt installation holes 5, bent bolts 6 and nuts 7. Two rows of embedded steel bars 2 are arranged in parallel in the expansion joint installation groove 1 between beam ends or between beam ends and abutments, and mirror-symmetrical F-shaped steel 3 is arranged between the two rows of embedded steel bars 2. The cavities of the F-shaped steel 3 are connected through the rubber strips 4. The lower part is provided with bolt installation holes 5, and the bent bolts 6 are arranged in the bolt installation holes 5. The bolt installation holes 5 and the bent bolts 6 are connected through the nuts 7.

[0045] The height of the bridge expansion joint device according to the embodiment is adjusted by adjusting the installation height of the bent bolts 6 in the rectangular bolt installation holes 5.

Claims

1. A bridge expansion joint apparatus, characterized by, The main body structure comprises two rows of embedded steel bars arranged in the expansion joint installation groove, an F-shaped steel arranged between the embedded steel bars, a rubber strip connecting the F-shaped steel, and a bent bolt connected with the F-shaped steel.

2. The bridge joint device according to claim 1, characterized in that The expansion joint installation groove is arranged between the beam ends or between the beam ends and the abutments.

3. The bridge joint device according to claim 2, characterized in that The two rows of embedded steel bars are parallel to each other, and the spacing between the embedded steel bars in each row is equal.

4. The bridge joint device according to claim 3, characterized in that The F-shaped steel is arranged between the embedded steel bars and is mirror-symmetric, and a bolt mounting hole is arranged at the lower part.

5. The bridge joint device according to claim 4, wherein The rubber strip is arranged in the cavity of the F-shaped steel.

6. The bridge joint device according to claim 5, characterized in that The bent bolt is arranged in the bolt mounting hole and is connected with the F-shaped steel through a nut.

7. The bridge joint device according to claim 6, characterized in that The embedded steel bars and the bent bolt have a certain spacing therebetween; The middle part of the rubber strip is in a V-shaped structure, and the end part is in a hammer-shaped structure and is clamped in the cavity of the F-shaped steel; The structure of the bolt mounting hole comprises a circle and a rectangle, when the bolt mounting hole is in a circular shape, the mounting position of the bent bolt is fixed, and when the bolt mounting hole is in a rectangular shape, the mounting position of the bent bolt is not fixed; The bent bolt is a single-folded bent bolt; The nut is arranged on the inner and outer sides of the bolt mounting hole.

8. The bridge joint device of claim 1, wherein The expansion joint installation groove between the beam ends or between the beam ends and the abutments is provided with two rows of embedded steel bars parallel to each other, and a mirror-symmetric F-shaped steel is arranged between the two rows of embedded steel bars, the cavities of the F-shaped steel are connected through a rubber strip, a circular bolt mounting hole is arranged at the lower part, a bent bolt is arranged in the bolt mounting hole, and the F-shaped steel and the bent bolt are connected through the bolt mounting hole and a nut.

9. The bridge joint device of claim 1, wherein The expansion joint installation groove between the beam ends or between the beam ends and the abutments is provided with two rows of embedded steel bars parallel to each other, and a mirror-symmetric F-shaped steel is arranged between the two rows of embedded steel bars, the cavities of the F-shaped steel are connected through a rubber strip, a rectangular bolt mounting hole is arranged at the lower part, a bent bolt is arranged in the bolt mounting hole, and the bolt mounting hole and the bent bolt are connected through a nut.

10. The bridge joint device of claim 1, wherein The expansion joint installation groove between the beam ends or between the beam ends and the abutments is provided with two rows of embedded steel bars parallel to each other, and a mirror-symmetric F-shaped steel is arranged between the two rows of embedded steel bars, the cavities of the F-shaped steel are connected through a rubber strip, a bolt mounting hole is arranged at the lower part, a rectangular bolt mounting hole and a circular bolt mounting hole are arranged at intervals, a bent bolt is arranged in the bolt mounting hole, and the bolt mounting hole and the bent bolt are connected through a nut.

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