EASILY MAINTAINABLE ASSEMBLY-TYPE BRIDGE EXPANSION JOINT STRUCTURE AND CONSTRUCTION METHOD THEREOF

Disclosed are an easily maintainable assembly-type bridge expansion joint structure and a construction method thereof. The easily maintainable assembly-type bridge expansion joint structure, comprising: a to-be-connected bridge beam end, wherein a number of the to-be-connected bridge beam end is two, and a groove platform is provided on each of the two beam ends in an extending direction of a gap; a connecting box body, wherein a number of the connecting box body is two, each of the two connecting box bodies is fixedly arranged on the groove platform of the beam end, and a box chamber is provided on opposite side surfaces of the two connecting box bodies respectively, a plurality of box chambers are provided, which are open opposite each other, and the box chamber is provided in the extending direction of the gap; a side beam, wherein a number of the side beam is two.

TECHNICAL FIELD

The present disclosure belongs to the technical field of bridge expansion joint construction, and particularly relates to an easily maintainable assembly-type bridge expansion joint structure and a construction method thereof.

BACKGROUND

When the expansion device of a bridge expansion joint fails to function properly, traditional expansion devices require traffic closure for either repairing the concrete area or replacing the expansion device, causing significant disruption to traffic. Furthermore, the complex construction process and long duration required for traditional expansion devices, coupled with the relatively long concrete curing time, extend the period of traffic closure. The frequent maintenance and replacement of bridge expansion devices also impose a heavy burden on the management and maintenance departments of highways and bridges.

SUMMARY

The objective of the present disclosure is to overcome the deficiencies in the prior art by providing an easily maintainable assembly-type bridge expansion joint structure and a construction method thereof, which enhance the assembly efficiency of expansion joint assembly structure, improve structural stability, and offer greater flexibility in assembly and maintenance, making them suitable for practical applications.

To achieve the above objective, the present disclosure adopts the following technical solutions:

In the first aspect, the present disclosure provides an easily maintainable assembly-type bridge expansion joint structure, comprising:a to-be-connected bridge beam end, wherein a number of the to-be-connected bridge beam end is two, and a groove platform is provided on each of the two beam ends in an extending direction of a gap;a connecting box body, wherein a number of the connecting box body is two, each of the two connecting box bodies is fixedly arranged on the groove platform of the beam end, and a box chamber is provided on opposite side surfaces of the two connecting box bodies respectively, a plurality of box chambers are provided, which are open opposite each other, and the box chamber is provided in the extending direction of the gap;a cross beam, wherein a plurality of cross beams are provided, bottoms of the two ends of the cross beam are connected to an inner bottom plate of the box chamber that is open opposite each other in the two connecting box bodies via a first elastic supporting seat respectively;a side beam, wherein a number of the side beam is two, the side beam spans the plurality of cross beams in the extending direction of the gap, a bottom of the side beam is connected to a top of the cross beam via a second elastic supporting seat, and a top of the side beam is fixedly connected to a top of the box chamber; andat least one middle beam, a bottom of the middle beam is fixedly arranged on the cross beam and located between the two side beams, and two sides of a top of the middle beam are elastically connected to the tops of the two side beams via an elastic telescopic piece respectively, and a groove filled with silicone gel is formed between the side beam, the elastic telescopic piece and the middle beam in the extending direction of the gap.

Further, the connecting box body comprises an L-shaped full-length steel plate matched with the groove platform in appearance, a displacement box and a concrete platform, a plurality of displacement boxes are provided and a plurality of concrete platforms are provided, the displacement box is arranged on a steel plate at intervals in the extending direction of the gap and is provided with the box chamber with an opening, and the concrete platform is fixedly installed or poured between adjacent displacement boxes.

Further, a rubber gasket is arranged between the displacement box and the steel plate, the displacement box is fixedly connected the bolts that sequentially penetrate through bolt holes on vertical side surfaces of the displacement box, the rubber gasket and the steel plate into the pre-embedded connector on the groove platform, and the pre-embedded connector comprises a connecting steel bar and an internal threaded sleeve fixedly connected with the connecting steel bar.

Further, both the steel plate and the groove platform are provided with a space filled with concrete mortar between a vertical direction and a horizontal direction, a rubber baffle for sealing the space is arranged at a port of the space in the horizontal direction, and a grouting hole communicated with the space is formed on horizontal bottom side surfaces of the displacement box, the rubber gasket and the steel plate in a penetrating mode and is used for pouring concrete mortar into the space.

Further, the groove platform is fixedly provided with at least one bolt base plate in the space in the horizontal direction, bolts moving up and down are arranged on the displacement box, the rubber gasket and the steel plate corresponding to the bolt base plate in a penetrating mode, the bolt abuts against the bolt base plate at a bottom end, and a vertical position height of the displacement box is adjusted by continuing to tighten the bolt upwards or downwards.

Further, an end of the inner threaded sleeve is provided with a circular rubber pad exposed out of the space in the vertical direction, and an outer end of the circular rubber pad abuts against the vertical side surface of the steel plate; and a chamfer is arranged at L-shaped corners of the displacement box, the rubber gasket and the steel plate.

Further, the top of the box chamber of the displacement box is provided with a detachable box cover, the box cover is connected to a top surface of the box chamber of the displacement box via the bolt, and the box cover is covered with a prefabricated concrete plate or a concrete layer poured to cover the box cover.

Further, a bar-shaped pin is fixedly connected to a bottom of the bolt arranged on the box cover in a penetrating mode, a top end of the box chamber of the displacement box is provided with a fixing plate with a bar-shaped pin hole, and the bar-shaped pin penetrates through the bar-shaped pin hole and is screwed to be in vertical cross buckle connection with the bar-shaped pin hole.

In the second aspect, the present disclosure further provides a construction method for the easily maintainable assembly-type bridge expansion joint structure according to any one of the first aspects, comprising the following steps:constructing an L-shaped stepped groove platform at each of two to-be-connected bridge beam ends, pre-embedding a pre-embedded connector formed by fixedly connecting a connecting steel bar and an inner threaded sleeve on a vertical side surface of a groove platform, pre-embedding or pasting a circular rubber pad at a port of the pre-embedded connector, and fixedly arranging at least one bolt base plate on a horizontal bottom surface of the groove platform;assembling a displacement box, a rubber gasket and a L-shaped full-length steel plate together with bolts on their respective transverse bottom surfaces to form a connecting box body, using a hoisting machinery to hoist the assembled connecting box body onto the corresponding groove platform at the bridge beam end, so that the connecting box body is placed on the groove platform in the extending direction of a gap and horizontally positioned in the front, back, left and right directions;adjusting the bolts at the horizontal bottom surface to abut against the corresponding bolt base plate, and continuing to tighten the bolts to adjust the vertical height position of the displacement box, after reaching the design elevation, fixedly connecting the bolts that sequentially penetrate through bolt holes on vertical side surfaces of the displacement box, the rubber gasket and the steel plate into the internal threaded sleeve of the pre-embedded connector on the groove platform, and abutting the circular rubber pad against an outer side surface of the L-shaped steel plate, so that a space with a certain distance is reserved between the L-shaped steel plate and the groove platform in the horizontal direction and the vertical direction, and arranging a sealing rubber baffle at a port of the space in the horizontal direction;sealing two sides of the space between the steel plate of the connecting box body and the groove platform, and injecting concrete mortar through grouting holes penetrating the horizontal bottom surfaces of the displacement box, the rubber gasket and the steel plate until the mortar fills the space and overflows from a top of the space in the vertical direction;arranging the cross beams on inner bottom plates of the box chambers of the opposite displacement boxes of the two bridge beam ends via the first elastic supporting seat, stretching the two side beams across a plurality of cross beams in the extending direction of the gap and fixedly connecting the two side beams to top surfaces of the cross beams via a second elastic supporting seat, fixing a bottom of a middle beam onto the cross beams and positioning the bottom of the middle beam between the two side beams, and fixedly connecting one end of the top of each side beam to the top of the box chamber of the displacement box while elastically connecting another end to the top of the middle beam via an elastic telescopic piece;fixedly connecting a bolt with a bar-shaped pin to a box cover in a penetrating mode, penetrating the bar-shaped pin through a fixing plate with a bar-shaped pin hole in a top end of the box chamber, and screwing the bolt until the bolt is buckled at a point where the bar-shaped pin and the bar-shaped pin hole intersect perpendicularly, so that the box cover is connected to the top of the box chamber of the displacement box; andhoisting and fixing a prefabricated concrete platform, matched with the space enclosed by an adjacent displacement box and a steel plate between the two adjacent displacement boxes, hoisting a concrete plate to cover a top surface of the box cover or pouring a concrete layer to cover the top surface of the box cover, and pouring silicone gel in a groove formed in the extending direction of the gap between the side beam, the elastic telescopic piece and the middle beam;Further, when the expansion joint structure needs to be maintained or replaced, the bolt with the bar-shaped pin on the box cover is loosened, the bar-shaped pin and the bar-shaped pin hole are aligned in the same direction to remove the box cover, and the bolt on the vertical side of the connecting box body is loosened to remove the entire connecting box body;or the elastic telescopic piece is loosened and removed to separate the side beam from the displacement box, so that a space is arranged between the opposite displacement boxes at the bridge beam end, and maintenance or replacement of the cross beam, the first elastic supporting seat, the second elastic supporting seat and the middle beam is facilitated.

Compared with the prior art, the beneficial effects of the present disclosure are as follows:

The present disclosure employs the easily maintainable assembly-type bridge expansion joint structure and construction method thereof, utilizing paired connecting box bodies with a plurality of displacement boxes containing the box chambers spaced within. The first elastic supporting seat, the cross beam, the second elastic supporting seat, the side beam, the middle beam and the elastic telescopic piece are arranged in the box chamber, which not only collectively form an expansion joint structure between the ends of assembled bridges but also provide more stable, reliable, and adaptable expansion joint performance through the elastic deformation of the first elastic supporting seat, the second elastic supporting seat and the telescopic piece.

The displacement box, the steel plate and the rubber gasket are assembled together and adjusted in height using horizontal bottom bolts, while vertical side bolts are used for fixed connections. By injecting mortar into the space through the grouting holes until it overflows from the top surface of the space, the overall stability of the connecting box bodies, as well as the sealing and stability of the connections with the beam ends, are enhanced.

From the perspective of the assembly construction process, the need for traditional concrete pouring in the expansion joint area is eliminated. The structure can be put into use immediately after being anchored and assembled with bolts, without waiting for concrete setting time. This minimizes the impact on subsequent bridge traffic, improves the overall efficiency of bridge expansion joint construction, making it more practical and valuable for industrial application.

In the accompanying drawings:

DETAILED DESCRIPTION OF THE EMBODIMENTS

The present disclosure is further described below with reference to the accompanying drawings. The following embodiments are only used for more clearly illustrating the technical solution of the present disclosure, and cannot be used to limit the protection scope of the present disclosure.

In the description of the present disclosure, it should be understood that the orientations or positional relationships indicated by the terms “center”, “longitudinal”, “transverse”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, etc. are based on the orientations or positional relationships shown in the drawings. They are merely intended to facilitate describing the present disclosure and simplify the description, rather than indicating or implying that the device or element referred to must have a specific orientation, and is constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present disclosure. In addition, the terms “first” and “second” are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of indicated technical features. Therefore, features defined as “first”, “second”, etc. may explicitly or implicitly include one or more of these features. In the description of the present disclosure, unless otherwise specified, “a plurality of” means two or more.

In the description of the present disclosure, it should be noted that, unless otherwise explicitly specified or defined, the terms “installed”, “connected with”, and “connected to” should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can be mechanical connections or electrical connections; they can be direct connections or indirect connections through intermediate media; and they can represent internal connections between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present disclosure can be understood on a case-by-case basis.

As shown inFIG.1andFIG.2, the embodiment of the present disclosure provides an easily maintainable assembly-type bridge expansion joint structure. The structure comprises the following components.

A to-be-connected bridge beam end1, wherein a number of the to-be-connected bridge beam end1is two, and a groove platform2is provided on each of the two beam ends1in an extending direction of a gap3;a connecting box body, wherein a number of the connecting box body is two, each of the two connecting box bodies is fixedly arranged on the groove platform2of the beam end1, and a box chamber5is provided on opposite side surfaces of the two connecting box bodies respectively, a plurality of box chambers5are provided, which are open opposite each other, and the box chamber5is provided in the extending direction of the gap3;a cross beam18, wherein a plurality of cross beams18are provided, bottoms of the two ends of the cross beam18are connected to an inner bottom plate of the box chamber5that is open opposite each other in the two connecting box bodies via a first elastic supporting seat17respectively;a side beam20, wherein a number of the side beam20is two, the side beam20spans the plurality of cross beams18in the extending direction of the gap3, a bottom of the side beam20is connected to a top of the cross beam18via a second elastic supporting seat19, and a top of the side beam20is fixedly connected to a top of the box chamber5; andat least one middle beam21, a bottom of the middle beam21is fixedly arranged on the cross beam18and located between the two side beams20, and two sides of a top of the middle beam21are elastically connected to the tops of the two side beams20via an elastic telescopic piece respectively, and a groove30filled with silicone gel22is formed between the side beam20, the elastic telescopic piece and the middle beam21in the extending direction of the gap.

The elastic telescopic piece23can be made of rubber strips or similar materials. The opposing sides of the side beam20and the middle beam21are respectively provided with grooves for clipping the rubber strips, such as C-shaped grooves. The beam end1structure of the rubber strip is matched with the C-shaped groove, facilitating a tight clip connection within the groove.

In some embodiments, the connecting box body comprises an L-shaped full-length steel plate6matched with the groove platform2in appearance, a displacement box4and a concrete platform7, a plurality of displacement boxes4are provided and a plurality of concrete platforms7are provided, the displacement box4is arranged on a steel plate6at intervals in the extending direction of the gap3and is provided with the box chamber5with an opening, and the concrete platform7is fixedly installed or poured between adjacent displacement boxes4. The groove platform2features an L-shaped step structure, as illustrated inFIG.5, and it is configured to match the L-shaped full-length steel plate6of the connecting box.

A rubber gasket8is arranged between the displacement box4and the steel plate6, the displacement box4is fixedly connected the bolts15that sequentially penetrate through bolt holes on vertical side surfaces of the displacement box4, the rubber gasket8and the steel plate6into the pre-embedded connector on the groove platform2, and the pre-embedded connector comprises a connecting steel bar10and an internal threaded sleeve11fixedly connected with the connecting steel bar10, which are used for connecting and fixing with the bolt15, facilitating the disassembly, assembly, and connection between the displacement box body4and the groove platform2. The rubber gasket can accommodate the deformation between the steel plate and the displacement box during installation, facilitating smooth removal when replacing the displacement box in the later stage.

Both the steel plate6and the groove platform2are provided with a space9filled with concrete mortar between a vertical direction and a horizontal direction, a rubber baffle28for sealing the space9is arranged at a port of the space9in the horizontal direction, and a grouting hole13communicated with the space9is formed on horizontal bottom side surfaces of the displacement box4, the rubber gasket8and the steel plate6in a penetrating mode and is used for pouring concrete mortar into the space9.

The grouting hole13is arranged to communicate with the space9in the horizontal direction, allowing the poured mortar to first fill the space9in the horizontal direction before gradually filling the space9in the vertical direction. This approach helps to achieve a better filled and sealed concrete mortar structure within the space9. Additionally, two sides of the space9should be sealed with templates or other materials before pouring the mortar.

In some embodiments, the groove platform2is fixedly provided with at least one bolt base plate16in the space9in the horizontal direction, bolts15moving up and down are arranged on the displacement box4, the rubber gasket8and the steel plate6corresponding to the bolt base plate16in a penetrating mode, the bolt15abuts against the bolt base plate16at a bottom end, and a vertical position height of the displacement box4is adjusted by continuing to tighten the bolt15upwards or downwards.

The displacement box4, the rubber gasket8, and the steel plate6are provided with coaxial internal threaded holes for connecting the bolt15, facilitating the adjustment of the height of the connecting box body by abutting against the bolt base plate16via the bolt1.

As shown inFIG.3, to prevent concrete mortar from entering the internal threaded sleeve11of the connector when pouring mortar into the space9, an end of the inner threaded sleeve11is provided with a circular rubber pad12exposed out of the space9in the vertical direction, and an outer end of the circular rubber pad12abuts against the vertical side surface of the steel plate6. The bolt15, passing through the vertical side, goes through the circular rubber pad12before connecting to the internal threaded sleeve11. In other words, the internal threaded sleeve11, the circular rubber pad12, and the bolt15opened on the vertical side and passing through the hole are all aligned on the same axis, thereby providing a sealing effect to protect the internal threaded sleeve11.

To facilitate installation, disassembly, and other operations, a chamfer14structure is arranged at L-shaped corners of the displacement box4, the rubber gasket8and the steel plate6. Additionally, the corresponding L-shaped corner of the groove platform2is further provided with a chamfer14structure, so that the space9forms the chamfer14structure at the corner. This design allows the concrete mortar to smoothly pass through the chamfer14from the horizontal space9to the vertical space9during pouring. For example, the chamfer14is inclined at a 45-degree angle.

For ease of installation, disassembly, maintenance, and other purposes, the top of the box chamber5of the displacement box4is provided with a detachable box cover27, the box cover27is connected to a top surface of the box chamber5of the displacement box4via the bolt15, and the box cover27is covered with a prefabricated concrete plate24or a concrete layer24poured to cover the box cover27to provide protection. Furthermore, to protect the bolts15on the box cover27, bolt protective sleeves or similar devices are sleeved over the corresponding bolts15.

As shown inFIG.4, the connection between the box cover27and the top of the box chamber5is a bolted latch connection. Specifically, a bar-shaped pin25is fixedly connected to a bottom of the bolt15arranged on the box cover27in a penetrating mode, a top end of the box chamber5of the displacement box4is provided with a fixing plate29with a bar-shaped pin hole26, and the bar-shaped pin25penetrates through the bar-shaped pin hole26and is screwed to be in vertical cross buckle connection with the bar-shaped pin hole26.

To prevent issues such as blockage of the expansion joint or aging and rupture of the elastic telescopic piece23, a groove filled with silicone gel22is formed in the extending direction of the gap3between the side beam20, the elastic telescopic piece and the middle beam21. The silicone gel22possesses certain corrosion resistance and abrasion resistance.

In the second aspect, the embodiment of the present disclosure further provides a construction method for the aforementioned easily maintainable and assembled bridge expansion joint structure, which specifically comprises the following steps:

Based on the drawings of the prefabricated expansion device, produce and assemble each component in the factory, including the fixed welding of the middle beam21and the cross beam18, the fixed welding or connection of the side beam20to the displacement box4, the positioning and fixed connection of the elastic supporting seats within the displacement box4, the reservation of bolt holes on various components, and the prefabrication of concrete platforms7on the left and right sides of the displacement box4.

As shown inFIG.3, constructing an L-shaped stepped groove platform2at each of two to-be-connected bridge beam ends1, pre-embedding a pre-embedded connector formed by fixedly connecting a connecting steel bar10and an inner threaded sleeve11on a vertical side surface of a groove platform2, pre-embedding or sleeving a circular rubber pad12at a port of the pre-embedded connector, and fixedly arranging at least one bolt base plate16on a horizontal bottom surface of the groove platform2.

Assembling a displacement box4, a rubber gasket8and a L-shaped full-length steel plate6together with bolts15on their respective transverse bottom surfaces to form a connecting box body, using a hoisting machinery to hoist the assembled connecting box body onto the corresponding groove platform2at the bridge beam end1, so that the connecting box body is placed on the groove platform2in the extending direction of a gap3and horizontally positioned in the front, back, left and right directions.

Adjusting the bolts15at the horizontal bottom surface to abut against the corresponding bolt base plate16, and continuing to tighten the bolts15to adjust the vertical height position of the displacement box4, after reaching the design elevation, fixedly connecting the bolts15that sequentially penetrate through bolt holes on vertical side surfaces of the displacement box4, the rubber gasket8and the steel plate6into the internal threaded sleeve11of the pre-embedded connector on the groove platform2, and abutting the circular rubber pad12against an outer side surface of the L-shaped steel plate6, so that a space9with a certain distance is reserved between the L-shaped steel plate6and the groove platform2in the horizontal direction and the vertical direction, and arranging a sealing rubber baffle28at a port of the space9in the horizontal direction.

Sealing two sides of the space9between the steel plate6of the connecting box body and the groove platform2, and injecting concrete mortar through grouting holes13penetrating the horizontal bottom surfaces of the displacement box4, the rubber gasket8and the steel plate6until the mortar fills the space9and overflows from a top of the space9in the vertical direction.

Arranging the cross beams18on inner bottom plates of the box chambers5of the opposite displacement boxes4of the two bridge beam ends1via the first elastic supporting seat17, stretching the two side beams20across a plurality of cross beams18in the extending direction of the gap3and fixedly connecting the two side beams20to top surfaces of the cross beams18via a second elastic supporting seat19, fixing a bottom of a middle beam21onto the cross beams18and positioning the bottom of the middle beam21between the two side beams20, and fixedly connecting one end of the top of each side beam20to the top of the box chamber5of the displacement box4while elastically connecting another end to the top of the middle beam21via an elastic telescopic piece23.

Fixedly connecting a bolt with a bar-shaped pin25to a box cover27in a penetrating mode, penetrating the bar-shaped pin25through a fixing plate29with a bar-shaped pin hole26in a top end of the box chamber5, and screwing the bolt15until the bolt15is buckled at a point where the bar-shaped pin25and the bar-shaped pin hole26intersect perpendicularly, so that the box cover27is connected to the top of the box chamber5of the displacement box4.

Hoisting and fixing a prefabricated concrete platform7, matched with the space9enclosed by an adjacent displacement box4and a steel plate6between the two adjacent displacement boxes4, hoisting a concrete plate24to cover a top surface of the box cover27or pouring a concrete layer24to cover the top surface of the box cover27, and pouring silicone gel22in a groove30formed in the extending direction of the gap3between the side beam20, the elastic telescopic piece23and the middle beam21.

In the embodiment, when the expansion joint structure needs to be maintained or replaced, the bolt15with the bar-shaped pin25on the box cover27is loosened, the bar-shaped pin25and the bar-shaped pin hole26are aligned in the same direction to remove the box cover27, and the bolt15on the vertical side of the connecting box body is loosened to remove the entire connecting box body;or the elastic telescopic piece23is loosened and removed to separate the side beam20from the displacement box4, so that a space9is arranged between the opposite displacement boxes4at the bridge beam end1, and maintenance or replacement of the cross beam18, the first elastic supporting seat17, the second elastic supporting seat19and the middle beam21is facilitated.

The above descriptions are only the preferred embodiments of the present disclosure. It should be noted that, for a person of ordinary skill in the art, numerous improvements and modifications can be made without departing from the principles of the present disclosure, and such improvements and modifications should also be considered within the scope of protection of the present disclosure.