Bridge expansion joint device

Abstract

The invention belongs to the technical field of bridge expansion joints, and relates to an anti-fatigue bridge expansion joint device, a main body structure comprises two rows of embedded steel bars arranged in an expansion joint mounting groove, F-shaped steel arranged between the embedded steel bars, a rubber strip connected with the F-shaped steel and a bending bolt connected with the F-shaped steel, and UHPC doped with PE fibers is poured in the mounting groove. Compared with common concrete, the strength, the crack resistance and the durability are greatly improved; pE fibers are adopted to replace traditional steel fibers in UHPC, corrosion of chloride ions in seawater and air is avoided, and the composite material is more suitable for the coastal complex service environment; the bending bolts are made of Q690 high-strength steel, compared with ordinary steel, the descending speed of steel-concrete interface shear stiffness can be reduced, the fatigue life can be prolonged, 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, and the service life of the bridge expansion joint device is prolonged. And a supporting effect on the bridge expansion joint device is also achieved.

Description

Technical field:

[0001] The invention belongs to the technical field of bridge expansion joints and relates to an anti-fatigue bridge expansion joint device with high durability, which is suitable for coastal areas. Background technology:

[0002] Expansion joints are an important auxiliary structure, which are set between beam ends or between beam ends and abutments. Their function is to meet the deformation of the bridge caused by temperature changes, concrete shrinkage creep, and vehicle loads, and to reduce the secondary stress of the superstructure caused by uneven settlement. The design service life of expansion joints in bridge structures is mostly 15 years. However, under the influence of the reciprocating action of vehicle loads and the complex service environment, their actual service life is far lower than the design service life. They often need to be replaced after a few years of operation, which increases the operation and maintenance costs, seriously affects driving comfort, and also poses a major safety hazard. For bridge expansion joints serving in complex service conditions in coastal areas, the erosion of chloride ions in air and seawater poses a more serious threat to their performance and service life.

[0003] The expansion joints of bridge structures have structural "discontinuity" characteristics. Compared with other components of the bridge structure, the expansion joints are subject to greater local impact. Under the reciprocating action of vehicle loads, the fatigue damage problem of bridge expansion joints is prominent. Common diseases are concentrated in: (1) concrete damage in the anchorage area; (2) fatigue cracking at the weld of the main steel structure of the expansion joint;

[0004] (3) Under complex coastal service conditions, chloride ions in the air and seawater corrode concrete and steel structures, seriously affecting the durability of bridge expansion joints.

[0005] At present, the concrete in the anchoring area of ​​the expansion joint is mostly made of ordinary concrete or UHPC material doped with steel fibers. For the expansion joints of bridges in coastal areas, the strength of ordinary concrete is relatively low and it is very easy to crack under the action of vehicle loads. For UHPC doped with steel fibers, the erosion of chloride ions in seawater and air can easily lead to the corrosion of steel fibers and steel structures inside UHPC, reducing the durability of the bridge structure, aggravating the deterioration of the mechanical properties of the bridge expansion joint, and seriously affecting the performance of the bridge structure.

[0006] The fatigue cracking at the welding points of the main steel structure of the expansion joint is manifested as follows: under the reciprocating action of vehicle loads, the initial welding defects generated during the welding process evolve into macro fatigue cracks. As the number of vehicle load actions increases, the fatigue cracks gradually expand until the remaining cross-section is insufficient to bear fatigue fracture, thereby threatening the safe use of the bridge structure.

[0007] The expansion joint structure of bridges in the prior art is complex, often requiring welding operations, and takes a long time to repair and replace. In addition, it is impossible to adjust according to the actual construction situation during on-site installation. The expansion joint structure and the concrete in the anchoring area are easily corroded in the complex coastal service environment, and are not suitable for coastal areas. For example, Chinese Patent 202410906967.X discloses a seamless expansion joint structure for a bridge pavement structure, including a bridge, a steel cover top plate, a composite paving device and a polymer elastic device. The bridge includes a bridge deck body, and a concave gap is provided between the bridge deck bodies. The polymer elastic device is installed in the narrow gap in the lower half of the concave gap. The upper surface of the polymer elastic device is connected to a steel cover bottom plate, and the upper surface of the steel cover bottom plate is connected to a composite paving device. The left and right sides of the composite paving device are close to the opposite sides of the bridge deck body. The middle position of the upper surface of the composite paving device is connected to a steel cover top plate, and the steel cover top plate includes a top plate surface, and the top plate surface A square groove is provided in the middle, a pressure detection plate is connected in the square groove on 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, and reinforcement test devices are connected to the front and rear sides of the top plate surface, the reinforcement test device includes a solar main board, rotating shafts are connected on both sides of the solar main board, laser holes are provided at the left and right ends of the solar main board surface, a laser transmitter is fixedly installed at the laser hole of the front solar main board, and a laser receiver is fixedly installed at the laser hole of the rear solar main board, and the laser transmitter, laser receiver and the left and right sides of the composite paving device are on the same horizontal line. Chinese Patent No. 202410844697.4 discloses a reset type bridge expansion joint device, including an expansion joint channel steel, a sealing rubber strip is arranged on the top between two expansion joint channel steels, a plurality of anchor steel bars are evenly arranged on the outside of the expansion joint channel steel, and a limiting mechanism for limiting the anchor steel bars is arranged inside the expansion joint channel steel; a reset mechanism for the distance between the two expansion joint channel steels is arranged between the two expansion joint channel steels and at the bottom of the sealing rubber strip, a U-shaped movable plate is fixed on the outside of the bottom of the expansion joint channel steel, a bottom transverse plate is slidably connected on the outside between the two U-shaped movable plates, and a U-shaped movable plate is arranged at one end of the U-shaped movable plate close to the bottom transverse plate and located inside the bottom transverse plate A rectangular sliding plate, a rectangular sliding groove is opened inside the bottom transverse plate, the bottom transverse plate and the U-shaped movable plate are slidably connected through the rectangular sliding groove and the cooperation of the rectangular sliding plate, the limiting mechanism includes a circular mounting block, a circular mounting block is fixed at one end of the anchor steel bar close to the expansion joint channel steel, the circular mounting block is located inside the expansion joint channel steel and is slidably connected to the expansion joint channel steel, the expansion joint channel steel is slidably connected to the inside of the vertical limit column with a vertical limit column, a rectangular connecting block is fixed on the top of the vertical limit column, the rectangular connecting block is laterally slid inside with a transverse limit column, a circular pull block is fixed at one end of the transverse limit column, and a second rigid spring is arranged between the circular pull block and the expansion joint channel steel and on the outside of the transverse limit column.Chinese Patent 202410740032.9 discloses an assembled bridge expansion joint device, including an abutment embedded part, which is embedded in a concrete abutment; an abutment connecting prefabricated part, which is connected to the abutment embedded part through a first fastener, and the abutment connecting prefabricated part is provided with a first sleeve, and the first sleeve is vertically arranged; a steel-concrete beam connecting prefabricated part, which is connected to the steel-concrete beam through a second fastener, and the steel-concrete beam connecting prefabricated part is provided with a second sleeve, and the second sleeve is vertically arranged; a water-stop device, which is arranged between the abutment connecting prefabricated part and the steel-concrete beam connecting prefabricated part; a comb plate, which is provided with an installation hole, and the installation hole is connected to the first sleeve and the second sleeve through a third fastener; a sealant is poured between the comb plate and the abutment connecting prefabricated part and between the comb plate and the steel-concrete beam connecting prefabricated part, and also includes a height adjustment pad, which is arranged between the abutment connecting prefabricated part and the comb plate, and / .

[0008] Or, it is arranged between the steel-concrete beam connection prefabricated part and the comb plate, and also includes a vibration-damping and noise-reducing bearing, which is arranged between the abutment connection prefabricated part and the comb plate and / or between the steel-concrete beam connection prefabricated part and the comb plate. Chinese Patent 202410664657.1 discloses a expansion joint structure for road bridge construction, including a pavement layer and a beam body, a beam end seam is arranged at the end of the beam body, a leveling layer is arranged below the pavement layer, the leveling layer is arranged above the beam body, and the pavement layer, the leveling layer and the beam body are connected in pairs from top to bottom, and a bridge deck seam is jointly opened at the upper end of the pavement layer and the leveling layer on one side close to the beam end seam, and the direction of the beam end seam in each group facing the bridge deck seam is the driving direction, and the bridge deck seam is filled with rubber particles, and the rubber particles The outside is covered with a permeable geotextile layer, which fills the side of the bridge deck joint and is bonded; the leveling layer is provided with a sealing steel plate corresponding to the beam end joint and close to the lower surface of the beam body, and a silicone grease layer is provided on the lower surface of the end of the sealing steel plate close to the bridge deck joint. The middle of the leveling layer is provided with spaced-apart layer gaps, and a reinforcement mesh is provided in the layer gaps, and the end of the reinforcement mesh extends to the edge of the bridge deck joint; the lower side of the beam body corresponding to the bridge deck joint is provided with multiple seepage pipes, the upper end of the seepage pipe is in contact with the permeable geotextile layer, and the lower end is flush with the bottom of the beam body. Therefore, a high-durability, fatigue-resistant bridge expansion joint suitable for coastal areas is developed and designed to solve the problem of chloride ion corrosion of steel fibers and steel structures in the complex service environment of coastal areas, and improve the durability of bridge expansion joints. Summary of the invention:

[0009] The purpose of the present invention is to develop and design a high-durability, fatigue-resistant bridge expansion joint for coastal areas in response to the problems existing in the prior art.

[0010] In order to achieve the above-mentioned object, the main structure of a bridge expansion joint device according to the present invention is as follows Figure 1-2 As shown, it includes two rows of embedded steel bars arranged in the expansion joint installation groove, and the embedded steel bars are arranged between the embedded steel bars. Figure 3The F-shaped steel, the rubber strip connected to the F-shaped steel, and the bent bolts connected to the F-shaped steel; wherein,

[0011] The expansion joint installation groove is set 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 distance between the front and back of each row of embedded steel bars is equal;

[0013] The F-shaped steel is set between the embedded steel bars, mirror-symmetrical, and has bolt mounting holes at the bottom;

[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 connected to the F-shaped steel through a nut.

[0016] The anchoring concrete cast inside the expansion joint installation groove of the present invention is ultra-high performance concrete (UHPC) mixed with polyethylene fiber (PE fiber);

[0017] There is a certain distance between the embedded steel bars and the bent bolts, eliminating the welding work between the expansion joint device and the embedded steel bars at the construction site, ensuring zero welding at the construction site;

[0018] The material of F-shaped steel is weathering steel, which makes the exposed steel more corrosion-resistant;

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

[0020] The structure of the bolt installation hole includes a circular shape and a rectangular shape. When it is a circular shape, the installation position of the bent bolt is fixed. When it is a rectangular 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] Bending bolts are as follows Figure 4 The single-fold bending bolt shown is made of Q690 high-strength steel. Compared with ML15, the shear bearing capacity of Q690 high-strength steel bolts in UHPC is greatly improved, and the fatigue strength of Q690 high-strength steel-UHPC shear connector under fatigue load is more than 70% higher than that of ordinary strength steel-ordinary concrete shear connector;

[0022] Nuts are arranged on both inner and outer sides of the bolt mounting hole to fix the bent bolts so that they are firmly connected with the F-shaped steel.

[0023] The cold connection of the F-shaped steel and the bent bolts involved in the present invention through bolt connection replaces the traditional welding connection method. At the same time, the bent bolts and the embedded steel bars are staggered at a certain distance during the construction process, thereby realizing "zero welding" of the bridge expansion joint device throughout the whole process. The welding work of Q690 high-strength steel and steel beams is not easy to proceed. The bolt connection not only avoids the initial welding defects and initial cracks generated during the welding process, but also greatly improves the fatigue resistance of the bridge expansion joint device under the reciprocating action of vehicle loads; it also reduces the manufacturing difficulty of the bridge expansion joint device and reduces the labor intensity.

[0024] The anchoring concrete of the present invention is UHPC mixed with PE fibers. Compared with UHPC mixed with steel fibers, it can effectively prevent chloride ions from corroding the fibers inside the anchoring concrete when tiny cracks occur in the concrete, and is more suitable for coastal and riverside areas.

[0025] Mix ratio of anchor concrete (kg / m 3 ) as shown in the following table:

[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 a bridge expansion joint device according to the present invention comprises the following steps:

[0028] First, an expansion joint installation groove of a set size is excavated between the beam ends where the expansion joint is to be set or between the beam end and the abutment;

[0029] Then, according to the opening height of the expansion joint installation slot, determine the installation position of the bent bolt in the bolt installation hole, install the bent bolt on the F-shaped steel through the nut, and then place the expansion device in the expansion joint installation slot so that the bent bolt and the embedded steel bar are horizontally staggered. Then, according to the actual slotting condition of the expansion joint installation slot, fine-tune the installation position of the bent bolt in the bolt installation hole, and make on-site adjustments to the installation of the bridge expansion joint device to adapt to the partial height deviation of the actual slotting condition of the installation slot;

[0030] Finally, pour anchoring concrete in the expansion joint installation groove. After the anchoring concrete reaches a certain strength, insert the rubber strip into the cavity of the F-shaped steel.

[0031] Among them, the opening position of the bolt mounting 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 the prior art, the present invention casts UHPC mixed with PE fiber in the installation groove, and its strength, crack resistance and durability are greatly improved compared with ordinary concrete; PE fiber is used to replace the traditional steel fiber in UHPC, which avoids the erosion of chloride ions in seawater and air, and is more suitable for complex coastal service environment; the bending bolt adopts Q690 high-strength steel, which can reduce the decrease rate of shear stiffness of the steel-concrete interface compared with ordinary steel, and improve fatigue life, and can not only achieve zero welding, but also increase the anchoring performance between the bridge expansion joint device and the anchoring concrete, while bearing the shear force and pulling force brought by vehicle loads, and also plays a supporting role for the bridge expansion joint device, so that the bridge expansion joint device can be directly placed on the main concrete of the bridge, which is easy to install on site, and the installation position of the bending bolt is convenient to adjust, which can be adjusted by nuts, which solves the problem that the expansion joint device cannot be adjusted according to the actual slotting situation to adapt to the actual slotting error on the construction site; it has a simple structure, is easy to install on site, does not require welding, has low construction intensity, short time and high efficiency. Description of the drawings:

[0033] Figure 1 It is a schematic diagram of the main structural principle of the present invention.

[0034] Figure 2 It is a partial principle schematic diagram of the main structure of the present invention.

[0035] Figure 3 The figure is a schematic diagram of the main structural principle of the F-shaped steel involved in the present invention.

[0036] Figure 4 The present invention is a schematic diagram of the main structural principle of the bending bolt. Specific implementation method:

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

[0038] Embodiment 1:

[0039] The main structure of a bridge expansion joint device involved in this embodiment includes 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 mutually parallel embedded steel bars 2 are arranged in the expansion joint installation groove 1 between the beam ends or between the beam ends and the abutments, and mirror-symmetrical F-shaped steels 3 are arranged between the two rows of embedded steel bars 2. The cavities of the F-shaped steels 3 are connected through the rubber strips 4, and bolt installation holes 5 with circular structures are arranged at the bottom, and bent bolts 6 are arranged in the bolt installation holes 5. The F-shaped steel 3 is connected to the bent bolts 6 through the bolt installation holes 5 and nuts 7.

[0040] Embodiment 2:

[0041] The main structure of a bridge expansion joint device involved in this embodiment is as follows Figure 1 As shown, it includes 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 mutually parallel embedded steel bars 2 are arranged in the expansion joint installation groove 1 between the beam ends or between the beam ends and the abutments, and a mirror-symmetrical F-shaped steel 3 is arranged between the two rows of embedded steel bars 2. The cavity of the F-shaped steel 3 is connected through the rubber strip 4, and a rectangular bolt installation hole 5 is arranged at the lower part, and a bent bolt 6 is arranged in the bolt installation hole 5, and the bolt installation hole 5 is connected to the bent bolt 6 through a nut 7.

[0042] The height of a bridge expansion joint device involved in this embodiment is adjusted by adjusting the installation height of the bending bolt 6.

[0043] Embodiment 3:

[0044] The main structure of a bridge expansion joint device involved in this embodiment is as follows Figure 1 As shown, it includes 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 mutually parallel embedded steel bars 2 are arranged in the expansion joint installation groove 1 between the beam ends or between the beam ends and the abutments, and mirror-symmetrical F-shaped steels 3 are arranged between the two rows of embedded steel bars 2. The cavities of the F-shaped steels 3 are connected through the rubber strips 4, and bolt installation holes 5 are arranged at the bottom. The bolt installation holes 5 of the rectangular structure and the bolt installation holes 5 of the circular structure are arranged at intervals, and bent bolts 6 are arranged in the bolt installation holes 5, and the bolt installation holes 5 are connected to the bent bolts 6 through nuts 7.

[0045] The height of a bridge expansion joint device involved in this embodiment is adjusted by adjusting the installation height of the bent bolt 6 in the bolt installation hole 5 of the rectangular structure.

Claims

1. A bridge expansion joint device, characterized in that: The main structure includes two rows of embedded steel bars arranged in the expansion joint installation groove, F-shaped steel bars arranged between the embedded steel bars, rubber strips connecting the F-shaped steel bars, and bent bolts connected to the F-shaped steel bars.

2. The bridge expansion 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 expansion 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 front and back of each row of embedded steel bars is equal.

4. The bridge expansion joint device according to claim 3, characterized in that: The F-shaped steel is arranged between the embedded steel bars, mirror-symmetrically, and has bolt mounting holes at the bottom.

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

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

7. The bridge expansion joint device according to claim 6, characterized in that: The anchoring concrete poured inside the expansion joint installation groove is ultra-high performance concrete mixed with polyethylene fibers; There is a certain distance between the embedded steel bars and the bent bolts; The material of F-shaped steel is weathering steel; The middle of the rubber strip is a V-shaped structure, and the end is a hammer-shaped structure, which is clamped in the cavity of the F-shaped steel; The structure of the bolt installation hole includes a circular shape and a rectangular shape. When it is a circular shape, the installation position of the bent bolt is fixed. When it is a rectangular 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. The bending bolt is a single-bending bending bolt made of Q690 high-strength steel; Nuts are arranged on both the inner and outer sides of the bolt mounting hole to fix the bent bolts.

8. The bridge expansion joint device according to claim 6, characterized in that: The cold connection of F-shaped steel and bent bolts by bolt connection replaces the welding connection method.

9. The bridge expansion joint device according to claim 6, characterized in that: The construction process includes the following steps: First, an expansion joint installation groove of a set size is excavated between the beam ends where the expansion joint is to be set or between the beam end and the abutment; Then, determine the installation position of the bent bolt in the bolt installation hole, install the bent bolt on the F-shaped steel, place the expansion device in the expansion joint installation groove, and adjust the installation position of the bent bolt in the bolt installation hole; Finally, pour anchoring concrete in the expansion joint installation groove and insert the rubber strip into the cavity of the F-shaped steel.

10. The bridge expansion joint device according to claim 9, characterized in that: The opening position of the bolt mounting hole is adjusted according to the height of the bridge expansion joint device.

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