Modular tensile displacement bridge expansion joint structure and construction method thereof

Abstract

This invention discloses a modular anti-tensile displacement bridge expansion joint structure and its construction method, comprising two beam ends arranged opposite each other, with L-shaped notches on the two beam ends mirror-image each other. A cross plate and an approach plate together form an U-shaped groove opening towards the other notch at the notch, and several elastic buffer columns connecting the cross plate and the approach plate are arranged along the transverse extension direction of the expansion groove near the opening of the U-shaped groove. The two approach plates are connected to the corresponding beam ends by a telescopic spring at their opposite ends, and a detachable elongated sealing strip is arranged on the opposite ends of the two approach plates along the transverse extension direction of the expansion groove. This modular anti-tensile displacement bridge expansion joint structure and its construction method meet the practical construction needs of improving the durability of bridges throughout their entire life cycle, facilitating construction and maintenance, and reducing operation and maintenance costs.

Description

Technical Field

[0001] This invention belongs to the field of building structure technology, specifically relating to a modular tensile displacement bridge expansion joint structure and its construction method. Background Technology

[0002] Expansion joints act as a conduit for longitudinal, lateral, and vertical deformations caused by temperature, concrete shrinkage and creep, vehicle loads, and seismic forces between the bridge span structure and the abutments (or adjacent spans) during construction. Their performance directly determines the smoothness of the bridge deck, driving comfort, and the durability of the substructure.

[0003] In recent years, with the widespread application of prefabricated bridges, long-span concrete continuous beams, and long-distance cross-sea and cross-river structures, the cumulative displacement of expansion joints has increased significantly, and traditional structures still expose many technical problems. For example, weak longitudinal tensile strength, easy jamming during multi-directional displacement, short life of seals and difficulty in replacement, and reliance on on-site wet operations for construction. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a modular tensile displacement bridge expansion joint structure and its construction method to meet the practical construction needs of improving the durability of bridges throughout their entire life cycle, facilitating construction and maintenance, and reducing operation and maintenance costs.

[0005] To achieve the above objectives, the present invention is implemented using the following technical solution.

[0006] In a first aspect, the present invention provides a modular tensile displacement bridge expansion joint structure, comprising two beam ends arranged opposite each other, and two beam ends having L-shaped notches that are mirror images of each other, the two notches forming an expansion groove together; At the L-shaped corner of the notch platform, a horizontally arranged horizontal plate and a vertically arranged inverted L-shaped plate are respectively hinged. The horizontal plate and the plate together form an inclined groove cavity with an opening facing another notch platform. Several elastic buffer columns connecting the horizontal plate and the plate are arranged near the opening of the inclined groove cavity along the lateral extension direction of the telescopic groove. The two overlapping plates are connected to the corresponding beam ends by a telescopic spring at their opposite ends. A detachable long strip sealing strip is provided on the opposite end faces of the two overlapping plates along the transverse extension direction of the telescopic groove.

[0007] Furthermore, at the L-shaped corner of the notch platform, several hinge plates with through holes are provided along the transverse extension direction of the telescopic groove. The hinge end of the horizontal plate is provided with several horizontal teeth that are spaced apart and have through holes along the transverse extension direction of the telescopic groove. The vertical hinge end of the plate is provided with several vertical teeth that are evenly spaced and have through holes along the transverse extension direction of the expansion groove. The hinge plate, horizontal teeth, and vertical teeth are alternately arranged along the transverse extension direction of the telescopic slot and connected together by a connecting shaft that passes through the through hole.

[0008] Furthermore, the sum of the thicknesses of the horizontal teeth and the vertical teeth is equal to the spacing between two adjacent hinge plates, or the sum of the thicknesses of two horizontal teeth and one vertical tooth is equal to the spacing between two adjacent hinge plates.

[0009] Furthermore, a spring receiving groove is provided on each of the two beam ends, extending longitudinally along the bridge and communicating with the expansion joint opening, and a first spring fixing groove is provided on the end face of the spring receiving groove away from the expansion joint opening; a second spring fixing groove is provided on the opposite end face of the two approach plates; the expansion spring is arranged longitudinally in the spring receiving groove, and after being stretched by the spring preload, the two ends of the expansion spring are respectively fixedly connected to the first spring fixing groove and the second spring fixing groove.

[0010] Furthermore, a predetermined gap is reserved between the vertical plate of the mounting plate and the vertical end face of the notch platform; a predetermined gap is also reserved between the horizontal end face of the mounting plate and the notch platform.

[0011] Furthermore, a detachable long strip sealing strip is provided on the opposite end face between the two horizontal plates along the lateral extension direction of the expansion groove, or several evenly spaced elastic buffer columns are provided on the opposite end face between the two horizontal plates along the lateral extension direction of the expansion groove.

[0012] In a second aspect, the present invention provides a construction method for a modular tensile displacement bridge expansion joint structure as described in any one of the first aspects, comprising the following steps: Step S1: When prefabricating or casting the beam, an integrally formed mirror-symmetrical L-shaped notch platform is used at the corresponding positions of the two opposite beam ends, and several hinged plates with through holes are pre-embedded along the transverse direction of the bridge at the corner of the notch platform. Meanwhile, a spring receiving groove connected to the expansion joint is reserved in the top plate or web of the beam, and a first spring fixing groove is opened on the end face of the spring receiving groove away from the expansion joint. Step S2: The horizontal plate and the gusset plate are processed and formed separately in the factory or on site, so that the horizontal plate is provided with horizontal teeth with through holes at intervals along the horizontal direction at the hinge end, and the gusset plate is provided with vertical teeth with through holes at intervals along the horizontal direction at the vertical hinge end. Step S3: Alternately engage the horizontal and vertical teeth with the pre-embedded hinge plate in the transverse direction of the beam end, insert the connecting shaft to complete the hinge, so that the horizontal plate and the lap plate form an i-shaped groove cavity with opposite openings at the notch platform. Step S4: Install several elastic buffer columns evenly along the transverse direction on the side of the opening of the C-shaped groove cavity, so that the two ends of the buffer columns are detachably connected to the horizontal plate and the mounting plate respectively. Step S5: Place the telescopic spring into the spring receiving groove and pre-stretch it so that its two ends are anchored in the first spring fixing groove and the second spring fixing groove on the back of the platform, respectively; and adjust the relative position of the two platforms, and embed a detachable long strip sealing strip along the transverse length on the opposite end face to complete the initial sealing of the expansion joint, and ensure that the vertical plate of the platform and the vertical and transverse end faces of the notch platform are reserved with the design gap. Step S6: A detachable long strip sealing strip is provided on the opposite end face between the two horizontal plates along the transverse extension direction of the expansion groove, or several evenly spaced elastic buffer columns are provided on the opposite end face between the two horizontal plates along the transverse extension direction of the expansion groove. Step S7: After the bridge deck paving and ancillary structures are completed, longitudinal tension-compression cycle testing is carried out on the expansion joints to check that the horizontal plates and slabs rotate and the springs expand and contract without jamming, and that the sealing strips do not fall off. Step S8: After the inspection is completed, the installation is finished.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: The modular anti-tensile displacement bridge expansion joint structure and its construction method provided by the present invention adopt a horizontal plate and a vertical inverted L-shaped plate hinged at the notch platform to form an I-shaped groove cavity with the opening facing another notch platform. It is equipped with elastic buffer columns, sealing strips, telescopic springs, etc., to form an expansion structure with tensile strength, buffering, sealing and stability, which facilitates construction and maintenance, and can meet the actual construction needs of improving the durability of the bridge throughout its entire life cycle and reducing operation and maintenance costs. Attached Figure Description

[0014] Figure 1 This is a perspective view of a modular tensile displacement bridge expansion joint structure provided in an embodiment of the present invention.

[0015] Figure 2 This is a perspective view of a modular tensile displacement bridge expansion joint structure provided in an embodiment of the present invention.

[0016] Figure 3 This is a top view of a modular tensile displacement bridge expansion joint structure provided in an embodiment of the present invention.

[0017] Figure 4 This is a forward view of a modular tensile displacement bridge expansion joint structure provided in an embodiment of the present invention.

[0018] Figure 5 This is a schematic diagram of a horizontal plate connection provided in an embodiment of the present invention.

[0019] Figure 6This is a schematic diagram of a beam end and notch platform provided in an embodiment of the present invention.

[0020] Figure 7 This is a perspective view of a mounting board provided in an embodiment of the present invention.

[0021] Figure 8 This is a perspective view of a telescopic spring provided in an embodiment of the present invention.

[0022] In the diagram: 1. Beam end; 2. Notch platform; 3. Expansion slot; 4. Horizontal plate; 5. Lap plate; 6. Buffer column; 7. Sealing strip; 8. Hinge plate; 9. Horizontal tooth; 10. Vertical tooth; 11. Through hole; 12. Connecting shaft; 13. Expansion spring; 14. Spring receiving slot; 15. First spring fixing slot; 16. Second spring fixing slot. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0024] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art will understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] like Figure 1 , Figure 2 , Figure 3 and Figure 4As shown, this embodiment of the invention provides a modular tensile displacement bridge expansion joint structure, including two beam ends 1 arranged opposite each other. The two beam ends 1 are provided with L-shaped notches 2 that are mirror images of each other. The two notches 2 together form an expansion groove 3 for configuring the bridge expansion joint structure.

[0027] Among them, at the L-shaped corner of the notch platform 2, there are horizontally arranged horizontal plates 4 and vertically arranged inverted L-shaped plates 5 respectively. The horizontal plates 4 and the plates 5 together form an inclined groove cavity with an opening facing the other notch platform 2. Several elastic buffer columns 6 connecting the horizontal plates 4 and the plates 5 are arranged along the transverse extension direction of the telescopic groove 3 near the opening of the inclined groove cavity.

[0028] The horizontal plate 4 and the lap plate 5 are hinged together at the L-shaped corner of the notch platform 2, and the U-shaped cavity structure they form together can vibrate or rotate at a certain preset amplitude relative to the L-shaped end faces of the notch platform 2. Under the combined action of the elastic buffer column 6 and the telescopic spring 13, a relatively stable structure is formed, which not only protects the sealing strip 7 from excessive stretching, but also significantly reduces the fatigue damage to the concrete in the anchoring area caused by vehicle impact and vibration response.

[0029] As a specific embodiment, the elastic buffer column 6 can adopt a structure of double-headed screws and an intermediate elastic buffer body, connected to the pre-reserved screw holes of the slab 5 and the cross plate 4 by screws at both ends. It can be arranged in at least one row along the transverse direction, or one column can be arranged every 250 mm along the transverse direction in staggered double rows, for example, an even number (4) column in the front row and an odd number (3) column in the back row, forming a checkerboard damping surface. Specifically, for example, a single joint (8 m wide bridge) has a total of 56 columns, which can provide a torsional restoring moment of ≥ 8 kN·m when the two lanes are unevenly loaded.

[0030] Two overlapping plates 5 are connected to their respective beam ends 1 by a telescopic spring 13 at their opposite ends. A detachable, elongated sealing strip 7 is provided on the opposite end faces of the two overlapping plates 5 along the transverse extension direction of the telescopic groove 3. The sealing strip 7 is manually pushed in along the barbed groove on the end face of the overlapping plate 5. Specifically, the sealing strip 7 can adopt a double Ω corrugated structure with a wave height of 8 mm and a wave pitch of 12 mm, which can unfold by 35% without necking when stretched; a symmetrical hollow dovetail, 10 mm high and 15 mm wide, forms a 1 mm interference fit with the barbed groove (14 mm wide and 9 mm deep) on the inner side of the overlapping plate 5, providing a continuous fastening pull-out force of 0.25 kN / m.

[0031] In some embodiments, at the L-shaped corner of the notch platform 2, a plurality of hinge plates 8 with through holes 11 are provided along the lateral extension direction of the telescopic groove 3 and are evenly spaced.

[0032] At the hinge end of the horizontal plate 4, there are several horizontal teeth 9 that are spaced apart and have through holes 11, extending laterally along the expansion groove 3.

[0033] At the vertical hinge end of the mounting plate 5, there are several vertical teeth 10 that are evenly spaced and have through holes 11, which are provided along the transverse extension direction of the expansion groove 3.

[0034] The hinge plate 8, the horizontal tooth 9 and the vertical tooth 10 are alternately arranged along the transverse extension direction of the telescopic slot 3 and connected together by a connecting shaft 12 through a through hole 11.

[0035] In some embodiments, the sum of the thicknesses of the horizontal teeth 9 and the vertical teeth 10 is equal to the spacing between two adjacent hinge plates 8, or the sum of the thicknesses of the two horizontal teeth 9 and the vertical teeth 10 is equal to the spacing between two adjacent hinge plates 8.

[0036] A pre-set gap is reserved between the vertical plate of the slab 5 and the vertical end face of the notch platform 2; a pre-set gap is also reserved between the horizontal end face of the slab 5 and the notch platform 2.

[0037] In some embodiments, a spring receiving groove 14 extending longitudinally along the bridge and communicating with the expansion joint 3 is provided on the two beam ends 1, and a first spring fixing groove 15 is provided on the end face of the spring receiving groove 14 away from the expansion joint 3; a second spring fixing groove 16 is provided on the opposite end faces of the two approach plates 5; the telescopic spring 13 is arranged longitudinally in the spring receiving groove 14, and after being stretched by the spring preload, the two ends of the telescopic spring 13 are fixedly connected to the first spring fixing groove 15 and the second spring fixing groove 16 respectively.

[0038] By setting the telescopic spring 13 as a hidden longitudinal pretensioner with no protruding components, it avoids the impact of vehicles running over it. The pretension force is adjustable, measurable, and replaceable, enabling full life cycle management. A spring receiving groove 14 in the same direction as the telescopic groove 3 is reserved in the concrete of the beam end 1. Through a two-stage process of factory pre-embedding and on-site tensioning, the spring is always in a controlled tensile state within the structure.

[0039] Furthermore, for long-span bridges with displacements >80 mm, two springs with different stiffnesses can be connected in series within the same receiving groove, for example, k = 6 N / mm for the far section and k = 10 N / mm for the near section. This forms a nonlinear restoring force with low damping for small displacements and high limiting for large displacements, reducing the peak tension of the sealing strip 7. Adding a 5 mm thick high-damping rubber pad to the bottom of the receiving groove creates a metal spring + rubber damping composite unit, which shortens the seismic impact attenuation time and avoids instantaneous overload caused by spring resonance. Additionally, an inspection port is provided within the spring receiving groove 14, equipped with an internal rotating sleeve. After the bridge deck paving is completed, a long-handled socket wrench can be used to rotate the sleeve within the inspection port to change its effective thread depth, achieving fine-tuning of the preload without disassembling the spring.

[0040] In some embodiments, a detachable elongated sealing strip 7 is provided on the opposite end face between the two horizontal plates 4 along the transverse extension direction of the telescopic groove 3.

[0041] Alternatively, several evenly spaced elastic buffer columns 6 are provided on the opposite end faces between the two horizontal plates 4 along the transverse extension direction of the telescopic groove 3, which always maintain a dual state of sliding and pressing with the bottom surface of the horizontal plate 4.

[0042] In this embodiment of the invention, a construction method for a modular tensile displacement bridge expansion joint structure is also provided, including the following steps: Step S1: When prefabricating or casting the beam, an integrally formed mirror-symmetrical L-shaped notch platform 2 is used at the corresponding positions of the two opposite beam ends 1, and several hinged plates 8 with through holes 11 are pre-embedded along the transverse direction at the corner of the notch platform 2. Meanwhile, a spring receiving groove 14 connected to the expansion slot 3 is reserved in the top plate or web of the beam, and a first spring fixing groove 15 is opened on the end face of the spring receiving groove 14 away from the expansion slot 3. Step S2: The horizontal plate 4 and the mounting plate 5 are respectively processed and formed in the factory or on site, so that the hinge end of the horizontal plate 4 is provided with horizontal teeth 9 with through holes 11 at intervals along the horizontal direction, and the vertical hinge end of the mounting plate 5 is provided with vertical teeth 10 with through holes 11 at intervals along the horizontal direction. Step S3: Alternately engage the horizontal teeth 9 and vertical teeth 10 with the pre-embedded hinge plate 8 in the transverse direction of the beam end 1, and insert the connecting shaft 12 to complete the hinge, so that the horizontal plate 4 and the lap plate 5 form an open-to-open chamfered cavity at the notch platform 2. Step S4: Install several elastic buffer columns 6 evenly along the transverse direction on the side of the opening of the C-shaped groove cavity, so that the two ends of the buffer column 6 are detachably connected to the horizontal plate 4 and the mounting plate 5 respectively. Step S5: Place the telescopic spring 13 into the spring receiving groove 14 and pre-stretch it so that its two ends are respectively anchored in the first spring fixing groove 15 and the second spring fixing groove 16 on the back of the mounting plate 5; and adjust the relative position of the two mounting plates 5, and embed the detachable long strip sealing strip 7 along the transverse length on the opposite end face to complete the initial sealing of the expansion joint, and ensure that the vertical plate of the mounting plate 5 and the vertical end face and transverse end face of the notch platform 2 are reserved with the design gap. Step S6: A detachable long strip sealing strip 7 is provided on the opposite end face between the two ramps 5 along the transverse extension direction of the expansion groove 3, or several evenly spaced elastic buffer columns 6 are provided on the opposite end face between the two ramps 5 along the transverse extension direction of the expansion groove 3. Step S7: After the bridge deck paving and ancillary structures are constructed, longitudinal tension-compression cycle testing is carried out on the expansion joints to check that the horizontal plate 4 and the lap plate 5 rotate and the springs extend without jamming, and that the sealing strip 7 does not fall off. Step S8: After the inspection is completed, the installation is finished.

[0043] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A construction method for a modular tensile displacement bridge expansion joint structure, characterized in that, The modular tensile displacement bridge expansion joint structure includes two beam ends arranged opposite each other, and the two beam ends are provided with L-shaped notches that are mirror images of each other, and the two notches together form an expansion groove. At the L-shaped corner of the notch platform, a horizontally arranged horizontal plate and a vertically arranged inverted L-shaped plate are respectively hinged. The horizontal plate and the plate together form an inclined groove cavity with an opening facing another notch platform. Several elastic buffer columns connecting the horizontal plate and the plate are arranged near the opening of the inclined groove cavity along the lateral extension direction of the telescopic groove. The two overlapping plates are connected to the corresponding beam ends by a telescopic spring at their opposite ends. A detachable long strip sealing strip is provided on the opposite end faces of the two overlapping plates along the lateral extension direction of the telescopic groove. The construction method includes the following steps: Step S1: When prefabricating or casting the beam, an integrally formed mirror-symmetrical L-shaped notch platform is used at the corresponding positions of the two opposite beam ends, and several hinged plates with through holes are pre-embedded along the transverse direction of the bridge at the corner of the notch platform. Meanwhile, a spring receiving groove connected to the expansion joint is reserved in the top plate or web of the beam, and a first spring fixing groove is opened on the end face of the spring receiving groove away from the expansion joint. Step S2: The horizontal plate and the connecting plate are processed and formed separately in the factory or on site, so that the horizontal plate is provided with horizontal teeth with through holes at intervals along the horizontal direction at the hinge end, and the connecting plate is provided with vertical teeth with through holes at intervals along the horizontal direction at the vertical hinge end. The sum of the thickness of the horizontal teeth and the vertical teeth is equal to the interval distance between two adjacent hinge plates. Step S3: Alternately engage the horizontal and vertical teeth with the pre-embedded hinge plate in the transverse direction of the beam end, insert the connecting shaft to complete the hinge, so that the horizontal plate and the lap plate form an i-shaped groove cavity with opposite openings at the notch platform. Step S4: Install several elastic buffer columns evenly along the transverse direction on the side of the opening of the C-shaped groove cavity, so that the two ends of the buffer columns are detachably connected to the horizontal plate and the mounting plate respectively. Step S5: Place the telescopic spring into the spring receiving groove and pre-stretch it so that its two ends are anchored in the first spring fixing groove and the second spring fixing groove on the back of the platform, respectively; and adjust the relative position of the two platforms, and embed a detachable long strip sealing strip along the transverse length on the opposite end face to complete the initial sealing of the expansion joint, and ensure that the vertical plate of the platform and the vertical end face and transverse end face of the notch platform are reserved with the design gap. Step S6: A detachable long strip sealing strip is provided on the opposite end face between the two horizontal plates along the transverse extension direction of the expansion groove; Step S7: After the bridge deck paving and ancillary structures are completed, longitudinal tension-compression cycle testing is carried out on the expansion joints to check that the horizontal plates and slabs rotate and the springs expand and contract without jamming, and that the sealing strips do not fall off. Step S8: After the inspection is completed, the installation is finished.

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