Self-resetting sliding support and stair structure

Abstract

The utility model provides a self-resetting sliding support and stair structure, including lower base, upper slip cover, elastic piece and tensile bottom plate, the top of lower base is equipped with the mounting strip hole that extends horizontally, the bottom of upper slip cover is equipped with the pressing block that is in sliding connection in the mounting strip hole, the elastic piece is connected between lower base and pressing block, and the elastic piece is connected with the tensile bottom plate. The tensile bottom plate is located at the bottom of the lower base, connected with the abutting block through a connecting piece and used for limiting the upward moving amplitude of the upper sliding cover. According to the self-resetting sliding support, when an earthquake occurs, horizontal displacement in the axial direction of the elastic piece can be generated between the upper sliding cover and the lower base, the equivalent strong supporting effect of a stair flight in a staircase is eliminated, the automatic resetting effect of the staircase is achieved, the tensile bottom plate at the bottom guarantees that the upper sliding cover and the lower base are not separated, and the self-resetting effect is achieved. And earthquake damage loss can be effectively reduced, and building functions can be ensured to be played during earthquake and quickly recovered after earthquake.

Description

Technical Field

[0001] The utility model belongs to the technical field of building sliding bearings, and more specifically, relates to a self-resetting sliding bearing and a staircase structure. Background Technique

[0002] Building stairs are important evacuation and escape channels during earthquakes and play an important role in reducing casualties. People's attention has gradually shifted from the concern for life safety during earthquakes to the resilience level of normal use during earthquakes, effective control of property losses after earthquakes, and rapid restoration of functions.

[0003] At present, there are two methods for the existing seismic design of stairs: one is the staircase structure without a sliding bearing, which requires considering the action of diagonal braces and overall analysis with the main structure; the other is the staircase structure with a sliding bearing, where the action and influence of diagonal braces do not need to be considered. Investigations have found that during earthquakes, the monolithic cast-in-place stairs without sliding bearings and their associated components are more likely to be damaged, while the sliding bearing stairs perform well.

[0004] The sliding bearing is generally arranged between the stair flight and the landing. Its horizontal stiffness is very small. Due to the simple structure of the current sliding bearing, the relative displacement of the staircase occurs after the earthquake due to sliding, and it is difficult to return to its original position, affecting the subsequent use of the staircase. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a self-resetting sliding bearing and a staircase structure, which can reduce the seismic damage of building stairs and improve the recovery ability of the structure.

[0006] To achieve the above object, the technical solution adopted by the utility model is: to provide a self-resetting sliding bearing, which is installed between the landing and the stair flight. The self-resetting sliding bearing includes a lower base, an upper sliding cover, an elastic member, and a tensile bottom plate. A horizontally extending installation slot hole is provided at the top of the lower base. A pressing block is provided at the bottom of the upper sliding cover and is slidably connected to the installation slot hole. The elastic member is connected between the lower base and the pressing block. The tensile bottom plate is located at the bottom of the lower base. The tensile bottom plate is connected to the pressing block through a connecting member and is used to limit the upward movement range of the upper sliding cover.

[0007] In a possible implementation manner, two elastic members are provided in each installation slot hole. The pressing block is located between the two elastic members, can move synchronously with the upper sliding cover, and compress or stretch the elastic members.

[0008] In a possible implementation manner, an installation bottom groove for embedding the tensile bottom plate is provided at the bottom of the lower base. The installation bottom groove is consistent with the extension direction of the installation slot hole and is communicated with the installation slot hole. The width of the tensile bottom plate is greater than the lower opening width of the installation slot hole.

[0009] In some embodiments, a stepped strip hole is provided at the lower end of the installation strip hole. The width of the stepped strip hole is smaller than that of the installation strip hole. A sliding strip extending into the stepped strip hole is provided at the lower part of the pressing block, and the sliding strip is slidably engaged with the stepped strip hole.

[0010] In a possible implementation, buffer pads are respectively provided at both ends of the installation bottom groove. The buffer pads can elastically abut against the end face of the tensile bottom plate to limit the sliding amplitude of the upper sliding cover.

[0011] In some embodiments, a protection buckling plate buckled to the bottom of the tensile bottom plate is provided in the installation bottom groove, and side protection plates extending into the installation bottom groove are respectively provided on the outer periphery of the protection buckling plate.

[0012] In a possible implementation, a communication hole is provided on the pressing block. The communication hole extends along the axial direction of the elastic member and is coaxially arranged with the elastic member.

[0013] In a possible implementation, an upper anchor bar extending upward and connected to the lower end of the stair section is connected to the upper sliding cover, and a lower anchor bar extending downward and connected to the stair landing is provided at the bottom of the lower base.

[0014] In some embodiments, the elastic member is a shape memory alloy elastic member, and wear-resistant layers are respectively provided on the top surface of the lower base. The wear-resistant layers are made of graphite material or lubricant material.

[0015] Compared with the prior art, the solution shown in the embodiment of the present application can generate a horizontal displacement along the axial direction of the elastic member between the upper sliding cover and the lower base during an earthquake, eliminate the equivalent strong support effect of the stair section in the stairwell, achieve the automatic reset effect of the stair, and the tensile bottom plate at the bottom ensures that the upper sliding cover and the lower base do not become disengaged, which can effectively reduce the earthquake damage loss and ensure the building function can be exerted during the earthquake and quickly resume use after the earthquake.

[0016] The present utility model also provides a stair structure, and this stair structure includes a self-resetting sliding support. The above-mentioned stair structure can reduce the earthquake damage impact on the building stairs, achieve the automatic reset effect of the stairs, and ensure the building function can be exerted during the earthquake and quickly resume use after the earthquake. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is the front view sectional structure schematic diagram of the self-resetting sliding support provided by the embodiment of the present utility model;

[0019] Figure 2 is a schematic cross-sectional structure view of A-A in the embodiment of the present utility model; Figure 1 in the middle;

[0020] Figure 3 is a schematic enlarged partial structure view of Ⅰ in the embodiment of the present utility model; Figure 1 in the middle;

[0021] Figure 4 is a schematic left view structure of the upper sliding cover in the embodiment of the present utility model; Figure 1 in the middle;

[0022] Figure 5 is a schematic top view structure of the lower base and the tensile bottom plate in the embodiment of the present utility model; Figure 1 in the middle;

[0023] Figure 6 is a schematic bottom view structure of the embodiment of the present utility model; Figure 5 in the middle;

[0024] Figure 7 is a schematic cross-sectional structure view of B-B in the embodiment of the present utility model; Figure 1 in the middle;

[0025] Figure 8 is a schematic enlarged partial structure view of Ⅱ in the embodiment of the present utility model; Figure 7 in the middle;

[0026] Figure 9 is a schematic structure view of the self-resetting sliding support in the use state provided by the embodiment of the present utility model.

[0027] Among them, each reference numeral in the figure:

[0028] 1. Lower base; 11. Installation strip hole; 12. Installation bottom groove; 13. Step strip hole; 2. Upper sliding cover; 21. Pressing block; 22. Sliding strip; 23. Communication hole; 3. Elastic member; 4. Tensile bottom plate; 41. Connecting member; 5. Buffer cushion block; 6. Protection buckle plate; 61. Side protection plate; 7. Wear-resistant layer; 81. Upper anchor bar; 82. Lower anchor bar; 91. Staircase; 92. Landing. Detailed implementation manners

[0029] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present utility model more clear and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0030] It should be noted that when an element is referred to as being "disposed on" another element, it can be directly on the other element or indirectly on the other element. It should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation on the present invention. The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0031] Please refer to Figures 1 to 9 , and now the self-resetting sliding support and staircase structure provided by the present invention will be described. The self-resetting sliding support is installed between the staircase landing 92 and the flight 91. The self-resetting sliding support includes a lower base 1, an upper sliding cover 2, an elastic member 3, and a tensile bottom plate 4. A horizontally extending mounting slot 11 is provided at the top of the lower base 1. A pressing block 21 slidably connected to the mounting slot 11 is provided at the bottom of the upper sliding cover 2. The elastic member 3 is connected between the lower base 1 and the pressing block 21. The tensile bottom plate 4 is located at the bottom of the lower base 1. The tensile bottom plate 4 is connected to the pressing block 21 through a connecting member 41 and is used to limit the upward movement amplitude of the upper sliding cover 2.

[0032] Compared with the prior art, for the self-resetting sliding support provided in this embodiment, during an earthquake, a horizontal displacement along the axial direction of the elastic member 3 can be generated between the upper sliding cover 2 and the lower base 1, and the two slide unidirectionally along the direction of the flight 91, eliminating the equivalent strong support effect of the flight 91 in the staircase, achieving the automatic reset effect of the staircase. The tensile bottom plate 4 at the bottom ensures that the upper sliding cover 2 and the lower base 1 do not become disengaged, which can effectively reduce the earthquake damage loss and ensure the building function can be exerted during the earthquake and quickly resume use after the earthquake.

[0033] In this embodiment, the self-resetting sliding support has a certain vertical compressive capacity. Under vertical earthquakes, the tensile bottom plate 4 ensures that the upper sliding cover 2 and the lower base 1 do not become disengaged. The elastic member 3 moves within a preset space (the mounting slot 11) without out-of-plane buckling, and the maximum horizontal sliding limit value of the upper sliding cover 2 is 1 / 50 of the height of the staircase flight 91.

[0034] In a possible implementation, please refer to Figures 1 to 9, two elastic members 3 are provided in each mounting bar hole 11, and the pressing block 21 is located between the two elastic members 3, can move synchronously with the upper sliding cover 2, and compress or stretch the elastic members 3.

[0035] In this embodiment, two elastic members 3 symmetrically arranged on both sides of the pressing block 21 are provided in the mounting bar hole 11. When the elastic member 3 is installed into the mounting bar hole 11, it should be appropriately pre-compressed to avoid the upper sliding cover 2 from being disturbed under a small force. The elastic modulus and phase change index of the elastic member 3 should be designed and adjusted according to different seismic action levels. In addition, further experimental verification should be carried out to ensure the reset accuracy of the sliding bearing.

[0036] Specifically, the materials of components such as the upper sliding cover 2 and the lower base 1 can adopt steel materials of models such as Q235, Q355, and Q420 according to the seismic fortification level, and the steel performance should meet the performance requirements of current national seismic steel. The elastic member 3 should be made of shape memory alloy. Shape memory alloy (abbreviated as SMA) generally refers to nickel-titanium alloy, which has shape memory effect and superelastic property (also known as pseudo-elasticity). It shows that under the action of external force, the shape memory alloy has a much larger deformation recovery ability than ordinary metals, that is, the large strain generated during the loading process will recover with unloading. During the positive and reverse phase change processes of nickel-titanium alloy under load, there is an obvious flat region in the stress-strain curve, indicating that due to phase change, a small stress change can produce a large strain change.

[0037] Specifically, the elastic member 3 can adopt different forms such as compression springs or tension springs, and all can achieve a good self-resetting function. The elastic member 3 made of the above materials has superelasticity, shape memory effect, large strain characteristics and good elastic recovery ability, can cooperate with the upper sliding cover 2 and the lower base 1 to form a reliable and stable self-resetting sliding bearing, so as to achieve the effect of the staircase returning to the initial position after an earthquake and meet the functional use requirements. The elastic member 3 is not affected by the environment or atmosphere other than temperature during its operation process, and it has good wear resistance, corrosion resistance and long service life.

[0038] In a possible implementation manner, please refer to Figures 1 to 9 , the bottom of the lower base 1 is provided with a mounting bottom groove 12 for embedding the tensile bottom plate 4. The mounting bottom groove 12 is consistent with the extending direction of the mounting bar hole 11 and is communicated with the mounting bar hole 11. The width of the tensile bottom plate 4 is greater than the lower opening width of the mounting bar hole 11.

[0039] In this embodiment, by setting the mounting bottom groove 12, the tensile bottom plate 4 can be embedded into the mounting bottom groove 12 to avoid protruding downward from the lower base 1 and affecting the installation of the lower base 1 and the staircase platform 92. The mounting bottom groove 12 has a certain length, can cooperate with the horizontal movement of the pressing block 21, and ensure the synchronism of the translation of the tensile bottom plate 4 and the upper sliding cover 2.

[0040] Specifically, the width of the tensile bottom plate 4 (this width refers to the dimension of the tensile bottom plate 4 in the horizontal direction and perpendicular to the axial direction of the elastic member 3) is greater than the lower opening width of the mounting strip hole 11, so as to prevent the tensile bottom plate 4 from disengaging upward from the lower base 1 under the pulling action of the pressing block 21, thereby realizing the limit of the upper sliding cover 2 in the up and down direction.

[0041] Based on the above structure, please refer to Figures 1 to 9 , a stepped strip hole 13 is provided at the lower end of the mounting strip hole 11. The width of the stepped strip hole 13 is smaller than the width of the mounting strip hole 11. A sliding strip 22 extending into the stepped strip hole 13 is provided at the lower part of the pressing block 21, and the sliding strip 22 is in sliding fit with the stepped strip hole 13.

[0042] In order to meet the tensile effect of the tensile bottom plate 4, a stepped strip hole 13 is provided below the mounting strip hole 11. The length of the stepped strip hole 13 is smaller than the length of the mounting strip hole 11, and sufficient space for the sliding of the sliding strip 22 can be provided. The width of the stepped strip hole 13 is smaller, so that the inner top wall of the mounting bottom groove 12 has a larger contact area with the tensile bottom plate 4, further ensuring the tensile performance of the tensile bottom plate 4.

[0043] In a possible implementation manner, please refer to Figures 1 to 9 , buffer pads 5 are respectively provided at both ends of the mounting bottom groove 12. The buffer pads 5 can elastically abut against the end faces of the tensile bottom plate 4 to limit the sliding amplitude of the upper sliding cover 2. The buffer pads 5 are located at both ends of the mounting bottom groove 12 and can be in flexible contact with the two end faces of the tensile bottom plate 4, so as to effectively limit the translation amplitude of the tensile bottom plate 4, and further effectively limit the sliding amplitude of the upper sliding cover 2.

[0044] In some embodiments, please refer to Figures 1 to 9 , a protection buckle plate 6 buckled to the bottom of the tensile bottom plate 4 is provided in the mounting bottom groove 12. Side guard plates 61 extending into the mounting bottom groove 12 are respectively provided on the outer periphery of the protection buckle plate 6. The protection buckle plate 6 seals the mounting bottom groove 12 from below the lower base 1, ensuring the flatness of the bottom plate of the lower base 1. At the same time, a closed sliding space is provided for the tensile bottom plate 4, avoiding the influence of external components on the movement of the tensile bottom plate 4, and meeting the seismic function of the structure.

[0045] In a possible implementation manner, please refer to Figures 1 to 9 , a communication hole 23 is provided on the pressing block 21. The communication hole 23 extends along the axial direction of the elastic member 3 and is coaxially arranged with the elastic member 3. The setting of the communication hole 23 enables the areas of the mounting strip hole 11 on both sides of the pressing block 21 to be effectively communicated, realizing the transmission of air flow, and avoiding the influence of different pressures on both sides on the sliding amplitude of the upper sliding cover 2.

[0046] In a possible implementation manner, please refer to Figures 1 to 9, an upper anchor bar 81 extending upward and connected to the lower end of the flight of stairs 91 is connected to the upper sliding cover 2, and a lower anchor bar 82 extending downward and connected to the landing 92 is provided at the bottom of the lower base 1. During the construction of the cast-in-place staircase, the lower anchor bar 82 at the bottom of the lower base 1 can be reliably connected to the landing 92, and the upper anchor bar 81 at the top of the upper sliding cover 2 can be reliably connected to the lower end of the flight of stairs 91, improving the reliability of the overall staircase structure.

[0047] In a possible implementation, please refer to Figures 1 to 9 , wear-resistant layers 7 are respectively provided on the top surface of the lower base 1, and the wear-resistant layers 7 are made of graphite material or lubricant material. When the upper sliding cover 2 moves horizontally relative to the lower base 1, the wear-resistant layers 7 can improve the lubricity between the two, avoid significant wear between the two, and help improve the service life of the structure.

[0048] Assembly of the self-resetting bearing:

[0049] 1. Apply graphite powder or lubricant on the top surface of the lower base 1 and the inner top wall of the installation bottom groove 12 to form the wear-resistant layer 7;

[0050] 2. Connect the two ends of the elastic member 3 to the lower base 1 and the upper sliding cover 2 respectively, and install the upper sliding cover 2 above the lower base 1 so that the pressing block 21 enters the installation strip hole 11 and the sliding strip 22 enters the step strip hole 13;

[0051] 3. Install the tensile bottom plate 4 into the installation bottom groove 12 and connect the tensile bottom plate 4 to the bottom of the sliding strip 22 with the connecting member 41;

[0052] 4. Install the buffer cushion block 5 into both ends of the installation bottom groove 12 and snap the protection buckle plate 6 into the installation bottom groove 12 so that the side protection plate 61 is located outside the buffer cushion block 5;

[0053] 5. Weld the upper anchor bar 81 above the upper sliding cover 2 and weld the lower anchor bar 82 to the bottom of the lower base 1;

[0054] 6. After the assembly is completed, conduct factory quality performance inspections.

[0055] Based on the same inventive concept, the embodiment of the present application also provides a staircase structure, which includes a self-resetting sliding bearing.

[0056] On-site construction and installation of the cast-in-place staircase:

[0057] 1. Tie the steel bars of the landing 92;

[0058] 2. Install the self-resetting sliding bearing above the landing 92, level it and fix it firmly;

[0059] 3. Pour and cure the concrete of the landing 92;

[0060] 4. Reinforce the steel bars of the stair flight 91;

[0061] 5. Pour and cure the concrete for the stair flight 91, and repeat the above steps at each floor's stair landing 92.

[0062] On-site construction and installation of precast stairs:

[0063] 1. When fabricating the precast stairs in the factory, embed steel plates at the connection positions of the stair flight 91 and the stair landing 92;

[0064] 2. Assemble and position the stair landing 92 on-site;

[0065] 3. After leveling the self-centering sliding bearing, weld the lower base 1 to the embedded plate on the stair landing 92;

[0066] 4. Assemble and position the stair flight 91 on-site;

[0067] 5. Weld the embedded steel plate at the bottom of the stair flight 91 to the upper sliding cover 2, and repeat the above steps at each floor's stair landing 92.

[0068] When an earthquake occurs, the above stair structure can form a horizontal displacement by using the self-centering sliding bearing arranged between the stair flight 91 and the stair landing 92, which can reduce the seismic damage to the building stairs, achieve the automatic reset effect of the stairs, and the tensile bottom plate 4 at the bottom ensures that the upper sliding cover 2 and the lower base 1 do not separate, which can effectively reduce the seismic damage loss and ensure the building functions can be exerted during the earthquake and quickly resume use after the earthquake.

[0069] The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-resetting sliding support is installed between a landing (92) and a flight of stairs (91), and is characterized in that, The self-resetting sliding support includes a lower base (1), an upper sliding cover (2), an elastic member (3), and a tensile bottom plate (4). A horizontally extending mounting strip hole (11) is provided at the top of the lower base (1). A pressing block (21) slidably connected within the mounting strip hole (11) is provided at the bottom of the upper sliding cover (2). The elastic member (3) is connected between the lower base (1) and the pressing block (21). The tensile bottom plate (4) is located at the bottom of the lower base (1), and the tensile bottom plate (4) is connected to the pressing block (21) through a connecting member (41) and is used to limit the upward movement amplitude of the upper sliding cover (2).

2. The self-resetting sliding support according to claim 1, wherein Two of the elastic members (3) are provided within each of the mounting strip holes (11). The pressing block (21) is located between the two elastic members (3), can move synchronously with the upper sliding cover (2), and compress or stretch the elastic members (3).

3. The self-resetting sliding support according to claim 1, wherein An installation bottom groove (12) for embedding the tensile bottom plate (4) is provided at the bottom of the lower base (1). The installation bottom groove (12) is consistent with the extending direction of the mounting strip hole (11) and is communicated with the mounting strip hole (11). The width of the tensile bottom plate (4) is greater than the lower opening width of the mounting strip hole (11).

4. The self-resetting sliding support according to claim 3, wherein, A stepped strip hole (13) is provided at the lower end of the mounting strip hole (11). The width of the stepped strip hole (13) is smaller than the width of the mounting strip hole (11). A sliding strip (22) extending into the stepped strip hole (13) is provided at the lower part of the pressing block (21), and the sliding strip (22) is slidably engaged with the stepped strip hole (13).

5. The self-resetting sliding bearing according to claim 3, characterized in that, Buffer pads (5) are respectively provided at both ends of the installation bottom groove (12). The buffer pads (5) can elastically abut against the end face of the tensile bottom plate (4) to limit the sliding amplitude of the upper sliding cover (2).

6. The self-resetting sliding support according to claim 5, characterized in that, A protective buckle plate (6) buckled to the bottom of the tensile bottom plate (4) is provided within the installation bottom groove (12). Side guard plates (61) extending into the installation bottom groove (12) are respectively provided on the outer periphery of the protective buckle plate (6).

7. The self-resetting sliding bearing according to any one of claims 1-6, characterized in that, A communication hole (23) is provided on the pressing block (21). The communication hole (23) extends along the axial direction of the elastic member (3) and is coaxially arranged with the elastic member (3).

8. The self-resetting sliding support according to any one of claims 1-6, characterized in that, An upper anchor bar (81) extending upward and connected to the lower end of the stair section (91) is connected to the upper sliding cover (2). A lower anchor bar (82) extending downward and connected to the stair landing (92) is provided at the bottom of the lower base (1).

9. The self-resetting sliding support according to claim 8, characterized in that, The elastic member (3) is a shape memory alloy elastic member (3). Wear-resistant layers (7) are respectively provided on the top surface of the lower base (1). The wear-resistant layers (7) are made of graphite material or lubricant material.

10. A staircase structure, characterized in that, It includes the self-resetting sliding support according to any one of claims 1-9.

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