Seamless telescopic device

Abstract

The seamless telescopic device comprises a telescopic device body and an elastic body, and the telescopic device body comprises a simply supported beam plate, a bottom plate assembly and a plurality of telescopic pieces; the bottom plate assemblies are symmetrically arranged at intervals of a certain distance S. The two ends of each simply supported beam plate are located on the inner sides of the ends, close to the distance S, of the bottom plate assemblies correspondingly, buckled with the bottom plate assemblies, cover the distance S and are used for adapting to deformation of a main body structure, and the telescopic pieces are symmetrically arranged between the simply supported beam plates and the end vertical faces of the bottom plate assemblies. The elastic body covers the upper portion of the telescopic device body and completely wraps the telescopic pieces, when the lower portion S of the simply supported beam plate changes, the telescopic pieces integrally and synchronously stretch out and draw back to deform, the telescopic pieces are symmetrically distributed in two sections of telescopic space between the simply supported beam plate and the bottom plate assembly, the load acting time is greatly shortened, and the load contact area is greatly reduced. And therefore, the safety and durability of the telescopic device are ensured, and the elastic body can effectively bear vertical loads in the constraint space.

Description

Technical Field

[0001] The present invention relates to the field of bridge structure construction, and in particular to a seamless expansion device. Background Art

[0002] Telescopic devices are a key product in civil engineering construction. Their basic functions include adapting to structural deformation (expansion and rotation), ensuring load-bearing capacity, ensuring comfort, and ensuring waterproofing and slag resistance. As my country's overall national strength increases, regulations are placing higher demands on environmental friendliness. For example, specific areas, such as ecological zones and residential areas, are subject to noise control regulations.

[0003] In summary, according to the requirements of national laws, regulations, standards, etc., and in line with the basic needs of the general public for a better life, the performance of the telescopic device should meet the requirements of adapting to structural deformation, load-bearing capacity, comfort, waterproofing and anti-slag; the environmental protection performance should meet the requirements of noise reduction and zero pollution emissions; the structure should meet the requirements of safety and durability.

[0004] Most existing technologies use flexible or elastic pull rods or cables to connect the anchor structures on both sides of the telescopic device, and fill them with elastomers to achieve a seamless state. The above existing technologies have the following characteristics:

[0005] 1. Unscientific structural design, avoiding the important and focusing on the trivial. Bridge ends are subject to complex stress conditions and are one of the areas with the highest risk and frequency of defects. Vehicle loads are large, and when they pass through the telescopic device, they simultaneously generate large vertical loads, oblique impact loads, horizontal shear loads, and vertical shear loads. The use of flexible or elastic rods and cables to connect the anchor structures on both sides of the telescopic device and fill them with elastomers to achieve a seamless solution is unable to withstand the complex and variable loads at the beam ends. Avoiding the most basic load-bearing capacity for the sake of seamlessness poses a serious safety risk.

[0006] 2. Another type of existing technology uses filling or covering of elastomers based on earlier technologies to achieve a seamless state. One part of the elastomer is in a free state, and the corresponding other part is in a shear state, resulting in an extremely short lifespan of this type of technical solution.

[0007] 3. Lack of safety and durability. According to a large number of research results and application practices, polymer materials have a high vertical bearing capacity only under certain effective constraints. The material itself has excellent tensile properties, but the shear strength and compressive stiffness (without effective constraints) are relatively low, especially elastic polymer materials. In addition, the large-scale application of polymer materials means that the contact surface with the vehicle load is larger, and the polymer material and vehicle load interact for a longer time. Under heavy loads, long action time and low shear strength and compressive stiffness (without effective constraints), existing technologies use a large number of polymer materials as core bearing parts, which seriously lack safety and durability.

[0008] 4. Unsatisfactory environmental performance. As mentioned in Items 1 and 3 above, existing technologies insert flexible rods or cables into polymer elastomers. Due to factors such as heavy loads and prolonged action, the flexible polymer material, due to the reaction force, creates an irregular clashing effect with the underlying structure, generating strong noise. Summary of the Invention

[0009] (1) Technical issues to be solved

[0010] The present invention provides a seamless telescopic device to solve the problems of the prior art such as unreasonable structural design, short life, lack of safety and durability, etc.

[0011] (2) Technical solution

[0012] The technical solutions provided by the present invention are as follows:

[0013] A seamless telescopic device, characterized in that it includes a telescopic device body and an elastic body, the telescopic device body includes a simply supported beam plate and a bottom plate assembly, the bottom plate assembly is symmetrically arranged at a certain distance S, the two ends of the simply supported beam plate are respectively located on the inner side of the bottom plate assembly close to one end of the distance S, and are interlocked with the bottom plate assembly to cover the distance S between the bottom plate assemblies, the elastic body covers the upper part of the telescopic device body and is movably connected to the bottom plate assembly, when the displacement of the beam end 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 end facades on both sides of the bottom plate assembly.

[0014] Optionally, the simply supported beam plate includes a top plate, two side plates and a plurality of rib plates, the side plates are aligned with the top plate in the length direction, the side plates are placed on both sides of the lower part of the top plate, the top surface of the side plates are fixedly connected to the bottom surface of the top plate, the rib plates are evenly distributed in the lower part of the top plate, the top surface of the rib plates are fixedly connected to the bottom surface of the top plate, the end surfaces of the rib plates are respectively fixedly connected to the inner facades of the side plates, and the side plates are respectively located on the inner side of the bottom plate assembly near one end of the 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 close to the inner long side of the base plate, is arranged on the top surface of the base plate along the length direction 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 close to the outer long side of the base plate, is arranged on the top surface of the base plate along the length direction of the base plate, the bottom surface of the outer vertical plate is fixedly connected to the top surface of the base plate, and the two side plates of the simply supported beam plate are respectively located on the inner side of 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, wherein the guide shafts are arranged along the length direction of the outer vertical plate, and the axes of the guide shafts are parallel to the normal of the outer vertical plate facade. 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 the guide shafts is ≥1, and the elastomer covers the interior of the base plate assembly and the guide shafts. When the displacement of the beam end changes, the distance S changes accordingly. The elastomer adapts to and drives the simply supported beam plate to move back and forth axially along the guide shaft between the two side end facades of the base plate assembly.

[0017] Optionally, it also includes a telescopic part, one end of which is fixedly connected to the outer vertical plate, and the other end is fixedly connected to the side plate of the simply supported beam plate, the guide shaft passes through the telescopic part, or the telescopic part is located in the middle of two adjacent guide shafts, the number of the telescopic parts is ≥1, the elastomer covers the interior of the base plate assembly, the guide shaft and the telescopic part, when the displacement of the beam end changes, the distance S changes accordingly, the elastomer and the telescopic part adapt to and drive the simply supported beam plate to move back and forth axially along the guide shaft between the two side end facades of the base plate assembly.

[0018] Optionally, the cross-section of the telescopic member is a corrugated plate, a honeycomb plate or a staggered diamond plate, and the cross-section of the telescopic member is parallel to the top surface of the bottom plate.

[0019] Optionally, it further includes several anchor plates, which are evenly distributed on the bottom surface of the bottom plate along the length direction 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.

[0020] (3) Technical effects

[0021] The base plate components are arranged symmetrically at a certain distance S. The two ends of the simply supported beam are respectively located on the inner side of the base plate component close to one end of the distance S, and are interlocked with the base plate component to cover the distance S between the base plate components to adapt to the deformation of the main structure. The simply supported beam serves as the core load-bearing member at the beam end to provide sufficient rigidity and strength for the bearing performance. The telescopic parts are symmetrically arranged between the simply supported beam and the end facade of the base plate component. When the lower part S of the simply supported beam changes, the telescopic parts will be deformed synchronously as a whole. The telescopic parts are symmetrically distributed in the two telescopic spaces between the simply supported beam and the base plate component, which greatly shortens the load action time and the load contact area, thereby ensuring the safety and durability of the telescopic device. The elastomer covers the upper part of the telescopic device body and completely wraps the telescopic The telescopic space of the telescopic part 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 telescopic device is smooth and seamless as a whole, and is integrated with the plane of the main structure after installation. The elastomer can effectively withstand heavy vertical loads in the constrained space; the guide shaft provides a movable guide for the simply supported beam and plate while absorbing the reaction force generated by the upper load, firmly constraining the telescopic part and the simply supported beam and plate and closely attaching them to the top surface of the base plate assembly to prevent noise; the cross-sectional forms of the telescopic part, such as waveform, honeycomb, and staggered diamond plates, have the deformation space required for compression and tensioning with large deformation, and can be synchronously expanded and contracted and deformed with the reciprocating movement of the side plates of the simply supported beam and plate, and the telescopic parts with the above cross-sectional forms have better load-bearing performance after being filled with elastomer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

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

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

[0025] Figure 3 This is a structural schematic diagram of a seamless telescopic device simply supported beam and plate provided in this application.

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

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

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

[0029] Figure 8 This is a finished product model of a seamless telescopic device provided in this application.

[0030] Figure 9 This is a rendering of the effect of a seamless telescopic device provided in this application in which the cross section of the telescopic part is arranged parallel to the top surface of the base plate assembly.

[0031] Figure 10 This is a rendering of the cross-section of the telescopic part of a seamless telescopic device provided in this application arranged parallel to the normal line of the top surface of the base plate assembly.

[0032] Description of reference numerals:

[0033] 1 - Telescopic 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 plate, 1023 - Outer plate, 1024 - Guide shaft, 1025 - Hexagonal bolt, 1026 - Hexagonal nut, 1027 - Anchor plate; 103 - Telescopic member; 2 - Elastomer; DETAILED DESCRIPTION

[0034] In order 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 in conjunction with the drawings in the embodiments of this application; it is obvious that the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0035] Example 1:

[0036] Attachment Figure 1 A side view of a seamless telescopic device provided in this application, with Figure 2 This is a structural diagram of the telescopic device body of a seamless telescopic device provided in this application. Figure 3 This is a structural diagram of a seamless telescopic device simply supported beam plate provided in this application, refer to the attached Figure 1 ~Attachment 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 member 103. The simply supported beam plate 101 includes a top plate 1011, two side plates 1012 and a plurality of ribs 1013. The side plates 1012 are placed on both sides of the lower part of the top plate 1011 and aligned with the top plate 1011 along the length direction. 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 direction of the top plate 1011. Several ribs 1011 are arranged, and the top surfaces of several ribs 1011 are welded to the bottom surface of the top plate 1011, and the end surfaces on both sides of the ribs 1011 are respectively welded to the inner facades of the side plates 1012. During production, the above top plate 1011, two side plates 1012 and several ribs 1013 can be welded into a whole in advance, and can be conveniently installed as an integral component at the construction site. The main function of the ribs 1013 is to strengthen the anchoring and bearing. When the anchoring is sufficient or the width of the transverse bridge telescopic device unit is not large, the ribs 1013 may not be needed.

[0037] Attachment Figure 4 This is a structural diagram of a seamless telescopic device bottom plate assembly provided in this application, with Figure 5 This is a schematic diagram of a seamless telescopic device bottom plate assembly and a simply supported beam-plate connection structure provided in this application. Figure 4 ~Attachment Figure 5 The bottom plate assembly 102 includes a bottom plate 1021, an inner vertical plate 1022 close to the inner long side of the bottom plate 1021, and arranged on the top surface of the bottom plate 1021 along the length direction of the bottom plate 1021. The bottom surface of the inner vertical plate 1022 is welded or bolted to the top surface of the bottom plate 1021. The number of inner vertical plates 1022 is ≥1. The side plate 1012 is located on the inner side of the inner vertical plate 1022 and is interlocked with the inner vertical plate 1022 to cover the distance S between the bottom plate assemblies 102. When the number of ribs 1013 is 2 and When installed at both ends of the simply supported beam 101, the inner vertical plate 1022 can be a whole plate. When the number of ribs 1013 is greater than 2, the inner vertical plate 1022 is a plurality of single plates, which are arranged alternately with the ribs 1013; the outer vertical plate 1023 is close to the outer long side of the bottom plate 1021 and is arranged on the top surface of the bottom plate 1021 along the length direction 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 an anchor angle steel or a vertical plate shape, as shown in the attached figure. Figure 4 The outer vertical plate 1023 shown is an anchoring angle steel, and the bottom surface of the anchoring angle steel is bolted to the bottom plate 1021 by a hexagonal bolt 1025. When the outer vertical plate 1023 is in the shape of a vertical plate, the bottom surface of the outer vertical plate 1023 is welded to the top surface of the bottom plate 1021, and one end of the telescopic member 103 is fixedly connected to the vertical surface of the outer vertical plate 1023, and the other end is connected to the side plate 1012 of the simply supported beam plate 101.

[0038] like Figure 4As shown, several guide shafts 1024 are evenly or unevenly arranged along the length direction of the outer vertical plate 1023, one end is anchored to the vertical surface of the outer vertical plate 1023 through a hexagonal nut 1026, and the other end is movably connected or anchored to the inner vertical plate 1022. When several guide shafts 1024 are arranged, each guide shaft 1024 passes through the hexagonal nut 1026, the vertical surface of the outer vertical plate 1023, the hexagonal nut 1026, the side plate 1012 and the inner vertical plate 1022 in sequence. Two hexagonal nuts 1026 are located on both sides of the vertical surface of the outer vertical plate 1023. The guide shaft 1024 is provided with a thread at one end close to the outer vertical plate 1023 or at both ends. When installing, tighten the two hexagonal nuts 1026 on both sides of the facade of the outer vertical plate 1023. The hexagonal nuts 1026 are threadedly connected to the guide shaft 1024. One end of the guide shaft 1024 is anchored to the outer vertical plate 1023. When the other end of the guide shaft 1024 passes through the side plate 1012 and the inner vertical plate 1022 in sequence, it can be in a free state. At this time, the guide shaft 1024, the outer vertical plate 1023, and the inner vertical plate 1022 form a simply supported beam structure. By setting a threaded section at the end of the guide shaft 1024 and opening a threaded hole in the inner vertical plate 1022, the guide shaft 1024 is threadedly connected to the inner vertical plate 1022, and is not anchored to the side plate 1012. At this time, the guide shaft 1024, the outer vertical plate 1023, and the inner vertical plate 1022 form a reaction frame structure. The facade of the outer vertical plate 1023, the side plate 1012 and the inner vertical plate 1022 are all provided with through holes. The axes of these through holes coincide and can allow the guide shaft 1024 to pass through, ensuring that the guide shaft 1024 and the telescopic device are in a stable state when the guide shaft 1024 is installed. 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, ensuring 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 the elastomer 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, etc., or have a certain combined structure with shaft guidance, such as a diamond-shaped linkage rod.

[0040] After the simply supported beam 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 to ensure that when the distance S changes, the side plate 1012 drives the simply supported beam 101 to move back and forth along the axial direction of the guide shaft 1024.

[0041] like Figure 5The figure shows a schematic diagram of the connection structure of the bottom plate assembly and the simply supported beam plate of a seamless telescopic device provided by this application, and the attached Figure 5 The ribs 1013 and the inner vertical plates 1022 are arranged in a staggered manner. During installation, the side plates 1012 are respectively 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 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] Attachment Figure 6 This is a schematic diagram of the telescopic structure of a seamless telescopic device provided by this application. The telescopic members 103 are placed on both sides of the simply supported beam plate 101. The telescopic members 103 are corrugated plates, one end of which is welded or bolted to the outer plate 1023, and the other end is welded or bolted to the side plate 1012. When several telescopic members 103 are installed, they can be placed as follows: Figure 4 and Figure 5 The space between two adjacent guide shafts 1024 can also be installed through the guide shaft 1024, and can be evenly arranged or unevenly arranged along the length direction of the outer 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 bottom plate 1021 or obliquely intersecting with the normal line of the top surface of the bottom plate 1021. This structural connection method can greatly improve the overall bearing performance of the telescopic device while achieving large deformation and telescopic deformation.

[0043] Attachment Figure 7 This is a schematic diagram of another telescopic component structure of a seamless telescopic device provided in this application. In this case, the corrugated plate is a whole, one end of which is welded or bolted to the outer plate 1023, and the other end is 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 corrugated plate in the body adapts to the movement and stretches and deforms.

[0045] In addition to the corrugated cross-section, the telescopic member can also have a honeycomb cross-section or a staggered diamond-shaped plate.

[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, and the telescopic device body 1 is fixedly connected to the beam end through the anchor plates 1021.

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

[0048] In addition, energy-absorbing material may be provided between the top surface of the inner vertical plate 1022 and the top plate 1011 , and wear-resistant material may also be provided on the top surface 2 of the elastic body.

[0049] Optionally, energy absorbing material may be provided within the distance S between the bottom plate components 102 .

[0050] Example 2:

[0051] The main difference between Example 2 and Example 1 is that Example 2 does not have a telescopic part 103, and the elastomer 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, and the end facades of the elastomer 2 are respectively connected to the inner side of the facade of the outer facade 1023 and the facade of the side panel 1012, and the bottom surface of the elastomer 2 is movably connected to the top surface of the base plate 1021, that is, the elastomer 2 is located in the effective constraint space composed of the facade of the outer facade 1023, the facade of the side panel 1012 and the top surface of the base plate 1021. When the displacement of the beam end changes, the distance S changes accordingly. The elastomer 2 adapts to and drives the simply supported beam plate 101 to move back and forth between the end facades on both sides 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", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships commonly placed when 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, be constructed and operated in a specific orientation. Therefore, they should not be understood as limitations on this application.

[0053] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed," "provided with," "installed," "connected," and "arranged" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application in specific contexts.

[0054] In the description of this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article or device. In the absence of further limitations, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0055] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand and implement the present 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 the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to be construed in the broadest manner consistent with the principles and novel features disclosed herein.

[0056] It should be understood that the present application is not limited to the above description and that various modifications and changes can be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A seamless telescopic device, characterized in that: It includes a telescopic device body and an elastic body. The telescopic device body includes a simply supported beam plate and a bottom plate assembly. The bottom plate assemblies are symmetrically arranged at a certain distance S. The two ends of the simply supported beam plate are respectively located on the inner side of the bottom plate assembly close to one end of the distance S, and are buckled with the bottom plate assembly to cover the distance S between the bottom plate assemblies. The elastic body covers the upper part of the telescopic device body and is movably connected to the bottom plate assembly. When the displacement of the beam end 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 end facades on both sides of the bottom plate assembly.

2. A seamless telescopic device according to claim 1, characterized in that: The simply supported beam plate includes a top plate, two side plates and a plurality of rib plates. The side plates are aligned with the top plate in the length direction. The side plates are placed on both sides of the lower part of the top plate. The top surface of the side plates is fixedly connected to the bottom surface of the top plate. The rib plates are evenly distributed in the lower part of the top plate. The top surface of the rib plates is fixedly connected to the bottom surface of the top plate. The end surfaces of the rib plates are respectively fixedly connected to the inner facades of the side plates. The side plates are respectively located on the inner side of the bottom plate assembly near one end of the distance S and are buckled with the bottom plate assembly.

3. A 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 close to the inner long side of the base plate and is arranged on the top surface of the base plate along the length direction 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 close to the outer long side of the base plate and is arranged on the top surface of the base plate along the length direction 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 respectively located on the inner side of 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 direction 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 the guide shafts is ≥1, and the elastomer covers the interior of the base plate assembly and the guide shafts. When the displacement of the beam end changes, the distance S changes accordingly. The elastomer adapts to and drives the simply supported beam plate to move back and forth axially along the guide shaft between the two side end facades of the base plate assembly.

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

6. A seamless telescopic device according to claim 5, characterized in that: The cross-section of the telescopic member is in the form of a corrugated plate, a honeycomb plate or a staggered diamond plate, and the cross-section of the telescopic member is parallel to the top surface of the bottom 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 direction of the bottom plate. The top surface of the anchor plate 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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