A seamless telescoping device

Abstract

The utility model discloses a seamless telescopic device, including telescopic device body and elastomer, telescopic device body includes simply supported beam board, bottom plate subassembly and a plurality of telescopic parts, bottom plate subassembly is arranged symmetrically at a certain distance S, and the both ends of simply supported beam board are respectively located the inboard of bottom plate subassembly close to one end of distance S, and are buckled with bottom plate subassembly, cover distance S, to adapt to the deformation of main body structure, and telescopic part is arranged symmetrically between the end facade of simply supported beam board and bottom plate subassembly, and elastomer covers the upper portion of telescopic device body, and completely wraps telescopic part, when the lower portion S of simply supported beam board changes, telescopic part whole synchronous telescopic deformation, and telescopic part is symmetrically distributed in the two telescopic spaces between simply supported beam board and bottom plate subassembly, greatly shortens the load action time length and load contact area, and then ensures the safety, durability of telescopic device, and elastomer can effectively bear heavy vertical load in the constraint space.

Description

Technical Field

[0001] This utility model relates to the field of bridge structure construction, specifically to a seamless expansion joint. Background Technology

[0002] Expansion joints are an important type of product in civil engineering construction. Their basic functions should include accommodating structural deformation (expansion, contraction, rotation), load-bearing capacity, comfort, and waterproofing / slag prevention. With the improvement of my country's overall national strength, relevant regulations have placed higher demands on environmental friendliness, such as requiring noise control in specific areas like ecological zones and residential areas.

[0003] In summary, in accordance with national laws, regulations, standards, and other requirements, and to meet the basic needs of the general public for a better life, expansion joints should meet the following performance requirements: adaptability to structural deformation, load-bearing capacity, comfort, and waterproofing and slag prevention; noise reduction and zero pollution emissions; and safety and durability.

[0004] Most existing technologies use flexible or elastic rods or cables to connect the anchoring structures on both sides of the expansion joint, and fill them with elastomers to achieve a seamless connection. These existing technologies have the following characteristics:

[0005] 1. Unscientific structural design, neglecting key aspects. The stress conditions at the ends of bridges are complex, making them one of the areas with the highest risk and frequency of structural defects. Vehicle loads are large, and when passing through expansion joints, significant vertical loads, skew impact loads, horizontal shear loads, and vertical shear loads are generated simultaneously. The technical solution of using flexible or elastic tie rods and cables to connect the anchorage structures on both sides of the expansion joint and filling them with elastic materials to achieve a seamless design cannot withstand the complex and variable loads at the beam ends. By avoiding the most basic load-bearing capacity in pursuit of a seamless design, serious safety risks are posed.

[0006] 2. Another type of existing technology achieves a seamless state by filling or covering an elastomer on the basis of earlier technologies. One part of the elastomer is in a free state, while the other part is in a shear state, resulting in an extremely short lifespan for this type of technology.

[0007] 3. Lack of safety and durability. Based on extensive research and practical applications, polymer materials only possess high vertical load-bearing capacity under certain effective constraints. While the materials themselves have excellent tensile properties, their shear strength and compressive stiffness (without effective constraints) are relatively low, especially for elastic polymer materials. Furthermore, the large-area application of polymer materials means a larger contact area with the vehicle load, resulting in a longer interaction time. Under heavy loads, long interaction times, and low shear strength and compressive stiffness (without effective constraints), current technologies that extensively use polymer materials as core load-bearing components severely lack safety and durability.

[0008] 4. Environmental performance is not ideal. As mentioned in points 1 and 3 above, the existing technology of inserting flexible tie rods or cables into polymer elastomers will generate strong noise due to factors such as heavy loads and long action time, and the flexible polymer material will have an irregular slapping effect with the lower structure due to the reaction force. Utility Model Content

[0009] (a) Technical problems to be solved

[0010] This utility model provides a seamless telescopic device to solve problems such as unreasonable structural design, short lifespan, lack of safety and durability in the existing technology.

[0011] (II) Technical Solution

[0012] The technical solution provided by this utility model is as follows:

[0013] A seamless telescopic device is characterized by comprising a telescopic device body and an elastic body. The telescopic device body includes a simply supported beam plate and a base plate assembly. The base plate assemblies are symmetrically arranged at a certain distance S. The two ends of the simply supported beam plate are located on the inner side of the base plate assembly near the end at distance S, and are interlocked with the base plate assembly, covering the distance S between the base plate assemblies. The elastic body covers the upper part of the telescopic device body and is movably connected to the base plate assembly. When the beam end displacement changes, the distance S changes accordingly. The elastic body adapts to and drives the simply supported beam plate to move back and forth between the two end faces of the base plate assembly.

[0014] Optionally, the simply supported beam slab includes a top plate, two side plates, and several ribs. The side plates are aligned with the top plate along its length. The side plates are placed on both sides of the lower part of the top plate. The top surface of the side plates is fixed to the bottom surface of the top plate. The ribs are evenly distributed in the lower part of the top plate. The top surface of the ribs is fixed to the bottom surface of the top plate. The end faces of the ribs are fixed to the inner surfaces of the side plates. The side plates are located on the inner side of the bottom plate assembly near the end at a distance S and are interlocked with the bottom plate assembly.

[0015] Optionally, the base plate assembly includes a base plate, an inner vertical plate, and an outer vertical plate. The inner vertical plate is located near the inner long side of the base plate and is arranged on the top surface of the base plate along the length of the base plate. The bottom surface of the inner vertical plate is fixedly connected to the top surface of the base plate. The outer vertical plate is located near the outer long side of the base plate and is arranged on the top surface of the base plate along the length of the base plate. The bottom surface of the outer vertical plate is fixedly connected to the top surface of the base plate. The two side plates of the simply supported beam plate are located inside the inner vertical plate and are interlocked with the inner vertical plate.

[0016] Optionally, the base plate assembly further includes a plurality of guide shafts, which are arranged along the length of the outer vertical plate, and the axes of the guide shafts are parallel to the normal of the outer vertical plate. One end of each guide shaft is fixedly connected to the outer vertical plate, and the other end passes through the side plate of the simply supported beam plate and the inner vertical plate of the base plate assembly in sequence. The number of guide shafts is ≥1. The elastic body covers the interior of the base plate assembly and the guide shafts. When the beam end displacement changes, the distance S changes accordingly. The elastic body adapts to and drives the simply supported beam plate to move back and forth along the axial direction of the guide shaft between the two side vertical surfaces of the base plate assembly.

[0017] Optionally, it also includes a telescopic component, one end of which is fixedly connected to the outer panel and the other end of which is fixedly connected to the side panel of the simply supported beam slab. The guide shaft passes through the telescopic component, or the telescopic component is located between two adjacent guide shafts. The number of telescopic components is ≥1. The elastic body covers the interior of the base plate assembly, the guide shaft, and the telescopic component. When the beam end displacement changes, the distance S changes accordingly. The elastic body and the telescopic component adapt to and drive the simply supported beam slab to move back and forth along the guide shaft axially between the two side end faces of the base plate assembly.

[0018] Optionally, the cross-sectional form of the telescopic component is a corrugated plate, a honeycomb plate, or an alternating diamond-shaped plate, and the cross-section of the telescopic component is parallel to the top surface of the base plate.

[0019] Optionally, it also includes a plurality of anchor plates, which are evenly distributed on the bottom surface of the bottom plate along the length direction of the bottom plate, and the top surface of the anchor plates is fixedly connected to the bottom surface of the bottom plate. The telescopic device body is fixedly connected to the beam end through the anchor plates.

[0020] (III) Technical Effects

[0021] The base plate components are symmetrically arranged at a certain distance S. The two ends of the simply supported beam slab are located on the inner side of the base plate component closest to the end at distance S, interlocking with the base plate component and covering the distance S between the base plate components to accommodate the deformation of the main structure. The simply supported beam slab serves as the core load-bearing component at the beam end, providing sufficient stiffness and strength for load-bearing performance. Expansion joints are symmetrically arranged between the end faces of the simply supported beam slab and the base plate component. When the lower part S of the simply supported beam slab changes, the expansion joints expand and contract synchronously. The expansion joints are symmetrically distributed in two expansion spaces between the simply supported beam slab and the base plate component, greatly shortening the load application time and load contact area, thereby ensuring the safety and durability of the expansion device. The elastic body covers the upper part of the expansion device body and completely encloses the expansion joint. The expansion joint's expansion space is filled with elastomer. The bottom surface of the elastomer is connected to the top surface of the base plate assembly. The top surface of the expansion joint is smooth and seamless, and after installation, it integrates with the plane of the main structure. Within the constrained space, the elastomer can effectively withstand heavy vertical loads. The guide shaft provides movement guidance for the simply supported beam plate while absorbing the reaction force generated by the upper load, firmly constraining the expansion joint and the simply supported beam plate and tightly adhering them to the top surface of the base plate assembly to prevent noise. The expansion joint's cross-sectional forms, such as corrugated, honeycomb, and staggered diamond plates, have the deformation space required to meet the compression and tension of large deformations. It can expand and contract synchronously with the back-and-forth movement of the side plates of the simply supported beam plate. Moreover, the expansion joints with the above cross-sectional forms have superior load-bearing performance after being filled with elastomer. Attached Figure Description

[0022] To more clearly illustrate the technical solution of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 A side view of a seamless telescopic device provided in this application.

[0024] Figure 2 This is a structural schematic diagram of the telescopic device body of a seamless telescopic device provided in this application.

[0025] Figure 3 This application provides a structural schematic diagram of a simply supported beam slab with a seamless expansion joint.

[0026] Figure 4 This is a structural schematic diagram of a seamless telescopic device base plate assembly provided in this application.

[0027] Figure 5 A schematic diagram of a seamless telescopic device base plate assembly and a simply supported beam-plate connection structure provided in this application.

[0028] Figure 6 , 7This is a structural schematic diagram of a seamless telescopic device telescopic component provided in this application.

[0029] Figure 8 A schematic diagram of a finished product model of a seamless telescopic device provided in this application.

[0030] Figure 9 The diagram shows the effect of the cross-section of the telescopic component of a seamless telescopic device provided in this application being arranged parallel to the top surface of the base plate assembly.

[0031] Figure 10 The diagram shows the effect of the cross-section of the telescopic component of a seamless telescopic device provided in this application being arranged parallel to the normal line of the top surface of the base plate assembly.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1-Extension device body; 101-Simply supported beam plate, 1011-Top plate, 1012-Side plate, 1013-Rib plate; 102-Bottom plate assembly, 1021-Bottom plate, 1022-Inner vertical plate, 1023-Outer vertical plate, 1024-Guide shaft, 1025-Hex bolt, 1026-Hex nut, 1027-Anchor plate; 103-Extension component; 2-Elastic body; Detailed Implementation

[0034] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this application.

[0035] Example 1:

[0036] Appendix Figure 1 A side view of a seamless telescopic device provided in this application is attached. Figure 2 This is a schematic diagram of the structure of the telescopic device body of a seamless telescopic device provided in this application. Figure 3 This application provides a structural schematic diagram of a simply supported beam-slab with a seamless expansion joint, as shown in the attached diagram. Figure 1 ~Attached Figure 3A seamless telescopic device includes a telescopic device body 1 and an elastic body 2. The telescopic device body 1 includes a simply supported beam plate 101, a bottom plate assembly 102, and a telescopic component 103. The simply supported beam plate 101 includes a top plate 1011, two side plates 1012, and several ribs 1013. The side plates 1012 are located on both sides of the lower part of the top plate 1011 and are aligned with the top plate 1011 along its length. The top surface of the side plates 1012 is welded to the bottom surface of the top plate 1011. The ribs 1013 are evenly spaced along the length of the top plate 1011. Several ribs 1011 are placed, with their top surfaces welded to the bottom surfaces of the top plate 1011. The two end faces of the ribs 1011 are welded to the inner surfaces of the side plates 1012. During production, the top plate 1011, two side plates 1012, and several ribs 1013 can be pre-welded into a whole, which can be easily installed on the construction site as a whole component. The main function of the ribs 1013 is to strengthen the anchoring and load-bearing capacity. When the anchoring is sufficient or the width of the transverse expansion joint unit is not large, the ribs 1013 may not be necessary.

[0037] Appendix Figure 4 This is a structural schematic diagram of a seamless telescopic device base plate assembly provided in this application, attached. Figure 5 This application provides a schematic diagram of a seamless expansion joint base plate assembly and a simply supported beam-slab connection structure. (See attached diagram.) Figure 4 ~Attached Figure 5 The base plate assembly 102 includes a base plate 1021, an inner vertical plate 1022 located near the inner long side of the base plate 1021 and arranged along the length of the base plate 1021 on its top surface, the bottom surface of the inner vertical plate 1022 being welded or bolted to the top surface of the base plate 1021, the number of inner vertical plates 1022 being ≥1, and a side plate 1012 located inside the inner vertical plate 1022, interlocking with the inner vertical plate 1022 and covering the distance S between the base plate assemblies 102. When the number of ribs 1013 is 2 and... When installed at both ends of a simply supported beam slab 101, the inner vertical plate 1022 can be a single plate. When the number of ribs 1013 is greater than 2, the inner vertical plate 1022 consists of multiple single plates, arranged alternately with the ribs 1013. The outer vertical plate 1023 is located near the outer long side of the bottom plate 1021, arranged along the length of the bottom plate 1021 on the top surface of the bottom plate 1021. The bottom surface of the outer vertical plate 1023 is welded or bolted to the top surface of the bottom plate 1021. The outer vertical plate 1023 can be anchored angle steel or a vertical plate shape, as shown in the attached figure. Figure 4 The outer panel 1023 shown is an anchoring angle steel. The bottom surface of the anchoring angle steel is bolted to the base plate 1021 by hexagonal bolts 1025. When the outer panel 1023 is in the shape of a vertical plate, the bottom surface of the outer panel 1023 is welded to the top surface of the base plate 1021. One end of the expansion joint 103 is fixedly connected to the vertical surface of the outer panel 1023, and the other end is connected to the side plate 1012 of the simply supported beam plate 101.

[0038] like Figure 4As shown, a number of guide shafts 1024 are arranged uniformly or unevenly along the length of the outer panel 1023. One end is anchored to the facade of the outer panel 1023 via a hexagonal nut 1026, and the other end is movably or anchored to the inner panel 1022. When a number of guide shafts 1024 are arranged, each guide shaft 1024 passes sequentially through the hexagonal nut 1026, the facade of the outer panel 1023, the hexagonal nut 1026, the side plate 1012, and the inner panel 1022. Two hexagonal nuts 1026 are located on both sides of the facade of the outer panel 1023. The guide shaft 1024 has a threaded end near the outer panel 1023, or both ends are threaded. During installation, tighten the two hexagonal nuts 1026 on both sides of the outer panel 1023. The hexagonal nuts 1026 are threaded to the guide shaft 1024, anchoring one end of the guide shaft 1024 to the outer panel 1023. The other end of the guide shaft 1024 can be in a free state when passing through the side panel 1012 and the inner panel 1022 in sequence. At this time, the guide shaft 1024, the outer panel 1023, and the inner panel 1022 form a simply supported beam structure. By providing a threaded section at the end of the guide shaft 1024 and a threaded hole in the inner vertical plate 1022, the guide shaft 1024 is threadedly connected to the inner vertical plate 1022 without anchoring to the side plate 1012. In this configuration, the guide shaft 1024, the outer vertical plate 1023, and the inner vertical plate 1022 form a reaction frame structure. Through holes are provided on the facade of the outer vertical plate 1023, the side plate 1012, and the inner vertical plate 1022. The axes of these through holes coincide, and all allow the guide shaft 1024 to pass through, ensuring that the guide shaft 1024 and the telescopic device are securely connected during installation. The overall positioning is accurate. The through hole on the side plate 1012 is not a threaded hole, and the inner diameter of the through hole is slightly larger than the outer diameter of the guide shaft 1024. When the guide shaft 1024 passes through the side plate 1012, it is not anchored to the side plate 1012. This ensures that when the distance S changes, the side plate 1012 drives the simply supported beam plate 101 to move back and forth along the axial direction of the guide shaft 1024. The inner diameter of the through hole on the vertical surface of the side plate 1012 is slightly larger than the outer diameter of the guide shaft 1024. After filling with the elastic body 2, it can flexibly adapt to the rotation angle and displacement of the beam end, thereby improving the service life of the telescopic device.

[0039] The cross-section of the non-threaded section of the guide shaft 1024 can be circular, rectangular, or have a defined combination structure with shaft guidance, such as a diamond linkage rod.

[0040] Alternatively, after the simply supported beam plate 101 and the base plate assembly 102 are installed and positioned, one end of the guide shaft 1024 can be welded to the outer vertical plate 1023, and the other end can be welded to the inner vertical plate 1022 through the through hole on the side plate 1012. This ensures that when the distance S changes, the side plate 1012 drives the simply supported beam plate 101 to move back and forth along the axial direction of the guide shaft 1024.

[0041] like Figure 5The diagram shown is a schematic representation of the seamless expansion joint base plate assembly and simply supported beam-slab connection structure provided in this application. Figure 5 The ribs 1013 and inner vertical plates 1022 are arranged alternately. During installation, the side plates 1012 are interlocked with the inner vertical plates 1022 at both ends of the distance S. The inner vertical plates 1022 block the side plates 1012 and cover the distance S between the bottom plate components of 102. When the distance S changes, the side plates 1012 drive the simply supported beam plate 101 to move back and forth along the axial direction of the guide shaft 1024.

[0042] Appendix Figure 6 This is a schematic diagram of the telescopic component structure of a seamless telescopic device provided in this application. The telescopic component 103 is placed on both sides of a simply supported beam slab 101. The telescopic component 103 is a corrugated plate, with one end welded or bolted to the outer vertical plate 1023 and the other end welded or bolted to the side plate 1012. When several telescopic components 103 are installed, they can be placed in a manner such as... Figure 4 and Figure 5 The space between two adjacent guide shafts 1024 can also be used for installation through the guide shafts 1024. They can be evenly or non-uniformly arranged along the length of the outer vertical plate 1023, such as... Figure 9 and Figure 10 As shown, the corrugated cross section of the corrugated plate is parallel to the top surface of the base plate 1021 or obliquely intersects the normal line of the top surface of the base plate 1021. This structural connection method can greatly improve the overall load-bearing capacity of the expansion joint while allowing for large deformation and expansion.

[0043] Appendix Figure 7 This is a schematic diagram of another telescopic component structure for a seamless telescopic device provided in this application. In this case, the corrugated plate is a whole, with one end welded or bolted to the outer vertical plate 1023 and the other end welded or bolted to the side plate 1012.

[0044] When the distance S changes, the side plate 1012 drives the simply supported beam plate 101 to move back and forth along the axial direction of the guide shaft 1024. Figure 6 and attached Figure 7 The wave plate in the middle expands and contracts to adapt to the movement.

[0045] In addition to corrugated cross sections, expansion joints can also be honeycomb cross sections or staggered diamond-shaped plates, etc.

[0046] like Figure 4 As shown, several anchor plates 1027 are evenly distributed on the bottom surface of the bottom plate 1021 along the length direction of the bottom plate 1021. The top surface of the anchor plates 1027 is welded to the bottom surface of the bottom plate 1021. The telescopic device body 1 is fixedly connected to the beam end through the anchor plates 1021.

[0047] like Figure 1As shown, the elastic body 2 covers the interior of the base plate assembly 102 and completely encloses the telescopic member 103 and the guide shaft 1024, which is equivalent to covering the upper part of the telescopic device body 1. The end faces of the elastic body 2 are connected to the inner side of the facade of the outer panel 1023 and the facade of the side panel 1012, respectively. The bottom surface of the elastic body 2 is movably connected to the top surface of the base plate 1021. That is, the elastic body 2 is located in the effective constraint space formed by the facade of the outer panel 1023, the facade of the side panel 1012 and the top surface of the base plate 1021. When the beam end displacement changes, the distance S changes accordingly. The elastic body 2 adapts to and drives the simply supported beam 101 to move back and forth between the two end faces of the base plate assembly 102.

[0048] In addition, an energy-absorbing material can be installed between the top surface of the inner vertical plate 1022 and the top plate 1011, and a wear-resistant material can also be installed on the top surface of the elastomer 2.

[0049] Optionally, energy-absorbing material can be installed within the distance S between the 102 base plate components.

[0050] Example 2:

[0051] The main difference between Embodiment 2 and Embodiment 1 is that Embodiment 2 does not have a telescopic component 103. The elastic body 2 covers the interior of the base plate assembly 102 and completely wraps the guide shaft 1024, which is equivalent to covering the upper part of the telescopic device body 1. The end faces of the elastic body 2 are connected to the inner side of the facade of the outer panel 1023 and the facade of the side panel 1012, respectively. The bottom surface of the elastic body 2 is movably connected to the top surface of the base plate 1021. That is, the elastic body 2 is located in the effective constraint space formed by the facade of the outer panel 1023, the facade of the side panel 1012 and the top surface of the base plate 1021. When the beam end displacement changes, the distance S changes accordingly. The elastic body 2 adapts to and drives the simply supported beam plate 101 to move back and forth between the two end faces of the base plate assembly 102. At this time, the side panel 1012 drives the simply supported beam plate 101 to move back and forth along the axial direction of the guide shaft 1024.

[0052] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inner", "outer", "front", "rear", "top", "bottom", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used in this application. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0053] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "equipped with," "installed," "connected," and "arranged" 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 can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0054] In the description of this application, relational terms such as “first” and “second” are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that an article or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0055] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0056] It should be understood that this application is not limited to the content already described above, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A seamless telescopic device, characterized in that, The device includes a telescopic device body and an elastic body. The telescopic device body includes a simply supported beam plate and a base plate assembly. The base plate assemblies are symmetrically arranged at a certain distance S. The two ends of the simply supported beam plate are located on the inner side of the base plate assembly near the end at distance S, and are interlocked with the base plate assembly, covering the distance S between the base plate assemblies. The elastic body covers the upper part of the telescopic device body and is movably connected to the base plate assembly. When the beam end displacement changes, the distance S changes accordingly. The elastic body adapts to and drives the simply supported beam plate to move back and forth between the two end faces of the base plate assembly.

2. The seamless telescopic device according to claim 1, characterized in that, The simply supported beam slab includes a top plate, two side plates, and several ribs. The side plates are aligned with the top plate along its length. The side plates are placed on both sides of the lower part of the top plate. The top surface of the side plates is fixed to the bottom surface of the top plate. The ribs are evenly distributed in the lower part of the top plate. The top surface of the ribs is fixed to the bottom surface of the top plate. The end faces of the ribs are fixed to the inner surfaces of the side plates respectively. The side plates are located on the inner side of the bottom plate assembly near the end at a distance S and are interlocked with the bottom plate assembly.

3. The seamless telescopic device according to claim 2, characterized in that, The base plate assembly includes a base plate, an inner vertical plate, and an outer vertical plate. The inner vertical plate is located near the inner long side of the base plate and is arranged on the top surface of the base plate along the length of the base plate. The bottom surface of the inner vertical plate is fixedly connected to the top surface of the base plate. The outer vertical plate is located near the outer long side of the base plate and is arranged on the top surface of the base plate along the length of the base plate. The bottom surface of the outer vertical plate is fixedly connected to the top surface of the base plate. The two side plates of the simply supported beam plate are located inside the inner vertical plate and are interlocked with the inner vertical plate.

4. A seamless telescopic device according to claim 3, characterized in that, The base plate assembly also includes a plurality of guide shafts, which are arranged along the length of the outer vertical plate and whose axes are parallel to the normal of the outer vertical plate. One end of each guide shaft is fixedly connected to the outer vertical plate, and the other end passes through the side plate of the simply supported beam plate and the inner vertical plate of the base plate assembly in sequence. The number of guide shafts is ≥1. The elastic body covers the interior of the base plate assembly and the guide shafts. When the beam end displacement changes, the distance S changes accordingly. The elastic body adapts to and drives the simply supported beam plate to move back and forth along the axial direction of the guide shaft between the two side vertical surfaces of the base plate assembly.

5. A seamless telescopic device according to claim 4, characterized in that, It also includes a telescopic component, one end of which is fixedly connected to the outer panel and the other end of which is fixedly connected to the side panel of the simply supported beam slab. The guide shaft passes through the telescopic component, or the telescopic component is located between two adjacent guide shafts. The number of telescopic components is ≥1. The elastic body covers the interior of the base plate assembly, the guide shaft, and the telescopic component. When the beam end displacement changes, the distance S changes accordingly. The elastic body and the telescopic component adapt to and drive the simply supported beam slab to move back and forth along the guide shaft axially between the two side end faces of the base plate assembly.

6. A seamless telescopic device according to claim 5, characterized in that, The cross-sectional form of the expansion joint is a corrugated plate, a honeycomb plate, or a diamond-shaped plate composed of alternating shapes, and the cross-section of the expansion joint is parallel to the top surface of the base plate.

7. A seamless telescopic device according to any one of claims 3 to 6, characterized in that, It also includes several anchor plates, which are evenly distributed on the bottom surface of the bottom plate along the length of the bottom plate. The top surface of the anchor plates is fixedly connected to the bottom surface of the bottom plate, and the telescopic device body is fixedly connected to the beam end through the anchor plates.

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