A detachable double-stage stiffness vibration isolation support with limiting device

Abstract

Disclosed is a detachable double-stage stiffness vibration isolation support with limiting, which comprises a connecting joint (1), a disc spring element (2), a transition plate (3), a middle guide rod (4), a coil spring element (5), an outer sleeve (6), a polyurethane pad (7) and a lower end plate (8). The middle guide rod passes through the connecting joint, the disc spring element, the transition plate and the coil spring element in sequence from top to bottom and enters the inner part of the outer sleeve. The connecting joint is in threaded cooperation with the top end of the middle guide rod. The lower end of the outer sleeve is fixedly connected with the lower end plate, and the polyurethane pad is arranged on the bottom surface in the inner part of the outer sleeve. The coil spring element is sleeved outside the outer sleeve and the middle guide rod, one end of the coil spring element abuts against the lower surface of the transition plate, and the other end abuts against the upper surface of the lower end plate. There is a gap between the bottom of the middle guide rod and the top of the polyurethane pad and between the top of the outer sleeve and the lower surface of the transition plate, which can ensure the free vertical movement of the coil spring element under the designed working condition.

Description

Technical Field

[0001] This invention relates to structural vibration isolation technology, and more particularly to a detachable, limit-equipped, double-stiffness vibration isolation bearing. Background Technology

[0002] With the vigorous development of rail transit, the vibration impact of rail transit operations on surrounding building structures has become increasingly prominent. Buildings adjacent to subway stations have a significant need for vertical isolation against rail transit vibrations. The structural vibrations caused by rail transit operations are primarily high-frequency vertical vibrations. Considering the existing buildings surrounding rail transit lines, which are mainly existing structures, to meet the office comfort requirements and cost control needs of buildings of different ages and under different usage conditions, vibration control should be implemented as much as possible without causing significant alterations or damage to the original building structure. However, current mainstream technologies require secondary modifications and reinforcement of the building foundation, such as adding foundation isolation / vibration bearings, which significantly impacts the building's usability, is costly, and has a long construction period. Considering all factors, current mainstream technologies have many unfavorable impacts.

[0003] Therefore, it is necessary to develop reliable and reasonably constructed variable stiffness vibration isolation bearings for raised floors to optimize the existing technology and solve the aforementioned engineering problems. Summary of the Invention

[0004] To overcome the aforementioned problems in existing technologies, this invention provides a detachable, limit-equipped, dual-stiffness vibration isolation support for raised floors. By incorporating two vertical vibration isolation elements with different stiffnesses, it meets vibration limitation requirements under various working conditions, employing both vertical helical springs and disc springs. Under different load conditions, the two spring elements provide vertical stiffness independently, allowing for changes in the device's vertical stiffness to adapt to vertical vibrations of different frequencies and amplitudes. Simultaneously, a rational design ensures horizontal limitation and adjustable height to meet the requirements of different sites and usage conditions. Due to the presence of threads and connecting joints, the device is easy to disassemble and install while meeting usage requirements.

[0005] According to one aspect of the present invention, a detachable, limit-positioned, double-stiffness vibration isolation bearing is provided, comprising:

[0006] Connecting joint 1, disc spring element 2, transition plate 3, intermediate guide rod 4, helical spring element 5, outer sleeve 6, polyurethane pad 7, and lower end plate 8;

[0007] The intermediate guide rod 4 passes through the connecting joint 1, the disc spring element 2, the transition plate 3 and the helical spring element 5 from top to bottom, and enters the inner cavity of the outer sleeve 6; the connecting joint 1 is threaded to the top of the intermediate guide rod 4; the disc spring element 2 is disposed between the connecting joint 1 and the transition plate 3.

[0008] The lower end of the outer sleeve 6 is fixedly connected to the lower end plate 8, and the polyurethane pad 7 is set on the bottom surface inside the outer sleeve 6; the helical spring element 5 is sleeved on the outside of the outer sleeve 6 and the middle guide rod 4, with one end of the helical spring element 5 abutting against the lower surface of the transition plate 3 and the other end abutting against the upper surface of the lower end plate 8.

[0009] There are gaps between the bottom of the intermediate guide rod 4 and the top of the polyurethane pad 7, and between the top of the outer sleeve 6 and the lower surface of the transition plate 3. These gaps ensure that the helical spring element 5 can move freely vertically under the designed operating conditions.

[0010] According to an embodiment of the present invention, the vertical stiffness of the disc spring element 2 is more than 10 times that of the helical spring element 5.

[0011] According to an embodiment of the present invention, the disc spring element 2 undergoes a preset deformation of about 5 mm under the structural self-weight load, and its vertical limit deformation does not exceed 20 mm.

[0012] According to an embodiment of the present invention, the helical spring element 5 undergoes a preset deformation of approximately 10 mm under the structural self-weight load, and its vertical limit deformation does not exceed 30 mm.

[0013] According to an embodiment of the present invention, the diameter of the intermediate guide rod 4 is smaller than the inner diameter of the outer sleeve 6, so as to ensure that the intermediate guide rod 4 can move up and down relative to the outer sleeve 6.

[0014] According to an embodiment of the present invention, the inner diameter of the disc spring element 2 is smaller than the outer diameter of the outer sleeve 6.

[0015] According to an embodiment of the present invention, the natural frequency of the vibration isolation support is below 8 Hz.

[0016] The beneficial effects of this invention are as follows: A detachable, limit-equipped, double-stiffness vibration isolation support is proposed through a reasonable structure, which achieves vertical vibration isolation for raised floors under different load conditions. By combining helical spring elements and disc spring elements, the stiffness and deformation characteristics of both types of spring elements are integrated, enabling the device to meet the vibration isolation requirements under different working conditions through vertical deformation of double stiffness. The intermediate guide rod and polyurethane pad cooperate to ensure that the helical spring element can stop compressing after reaching the designed vertical deformation amount, and the disc spring element can then take over. Due to the installation of an outer sleeve that cooperates with the helical spring element and the inherent characteristics of high horizontal stiffness and small horizontal deformation of the disc spring element, the support maintains a small horizontal displacement under various working conditions. This device ensures that the raised floor, when used with the support, meets the vertical vibration isolation requirements under rail transit vibrations. Simultaneously, its horizontal limiting mechanism overcomes the inherent tendency of spring elements to move horizontally under excitation, thus meeting comfort requirements in office environments and improving the safety of the vibration isolation device while maintaining vibration isolation performance. The device features threads on the intermediate guide rod that mate with the threads of the connecting joint, enabling adjustable height and effective limiting of the raised floor connection joint. This allows for manual leveling of the raised floor and facilitates convenient installation. The device has a reasonable and stable structure. With easily replaceable disc spring elements, it can be replaced with spring elements of corresponding stiffness according to the actual design load, achieving long-term, maintenance-free, and easy-to-disassemble use, demonstrating high engineering application value.

[0017] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0018] The following description will detail some specific embodiments of the invention by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art will understand that these drawings are not necessarily drawn to scale. The objectives and features of the invention will become more apparent from the following description taken in conjunction with the accompanying drawings, in which:

[0019] Appendix Figure 1 This is a schematic cross-sectional view of a detachable, limit-equipped, double-stiffness vibration isolation bearing according to an exemplary embodiment of the present invention.

[0020] Appendix Figure 2 A cross-sectional schematic diagram of the intermediate guide rod, helical spring element and outer sleeve of a detachable double-stiffness vibration isolation support with limiting according to an exemplary embodiment of the present invention.

[0021] In the diagram, 1-connecting joint, 2-disc spring element, 3-transition plate, 4-intermediate guide rod, 5-coil spring element, 6-outer sleeve, 7-polyurethane pad, 8-lower end plate. Detailed Implementation

[0022] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but these are not intended to limit the scope of protection of the present invention.

[0023] 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.

[0024] Appendix Figure 1 Figure 1 is a cross-sectional schematic diagram of a detachable, limiting, double-stiffness vibration isolation bearing according to an exemplary embodiment of the present invention; Figure 2 is a partial cross-sectional schematic diagram of a detachable, limiting, double-stiffness vibration isolation bearing according to an exemplary embodiment of the present invention. (Reference) Figure 1-2 The disassembly and limiting double-stiffness vibration isolation support of the implementation scheme may include a connecting joint 1, a disc spring element 2, a transition plate 3, an intermediate guide rod 4, a helical spring element 5, an outer sleeve 6, a polyurethane pad 7, and a lower end plate 8.

[0025] As shown in the figure, the intermediate guide rod 4 passes through the connecting joint 1, the disc spring element 2, the transition plate 3 and the helical spring element 5 from top to bottom, and enters the inner cavity of the outer sleeve 6; the outer sleeve 6 is fixedly connected to the lower end plate 8, and the polyurethane pad 7 is set on the bottom surface inside the outer sleeve 6; the helical spring element 5 is sleeved on the outside of the outer sleeve 6 and the intermediate guide rod 4, with one end of the helical spring element 5 abutting against the lower surface of the transition plate 3 and the other end abutting against the upper surface of the lower end plate 8.

[0026] More specifically, the connecting joint 1 and the top thread of the intermediate guide rod 4 form a height adjustment mechanism. The height of the raised floor (erected on the connecting joint) can be changed by the connecting joint 1 relative to the ground through the thread of the top part of the intermediate guide rod 4.

[0027] A disc spring element 2 is disposed between the connecting joint 1 and the transition plate 3. For example, the bottom of the disc spring element 2 is fixed to the top of the transition plate 3, and the disc spring element 2 and the transition plate 3 can move up and down relative to the intermediate guide rod 4. The disc spring element 2 can be a disc steel spring, and disc steel springs with different stiffnesses can be replaced according to the actual engineering needs under different design loads. For example, its preset deformation under structural self-weight load can be about 5mm, and its vertical limit deformation does not exceed 20mm.

[0028] The helical spring element 5 is sleeved outside the outer sleeve 6 and the intermediate guide rod 4, with its inner diameter slightly larger than the outer diameter of the outer sleeve 6 and the intermediate guide rod 4. For example, the helical spring element 5 can be a helical steel spring. For example, its preset deformation under the structural self-weight load can be about 10 mm, and it is controlled and limited by the combination of the intermediate guide rod 4 and the polyurethane pad 7, with its vertical limit deformation not exceeding 30 mm. In addition, to meet the variable stiffness function of the vibration isolation device, the vertical spring stiffness of the disc spring element 2 should be at least 10 times that of the vertical spring stiffness of the helical spring element 5 to ensure that the disc spring element 2 and the helical spring element 5 do not interfere with each other.

[0029] A portion of the intermediate guide rod 4 extends into the inner cavity of the outer sleeve 6. The bottom end of the intermediate guide rod 4 is a certain distance from the polyurethane pad 7, and the top end of the outer sleeve 6 is also a certain distance from the lower surface of the transition plate 3. Such distances ensure that the helical spring element 5 can move freely vertically under the design conditions.

[0030] In addition, the inner diameter of the disc spring element 2 can be designed to be smaller than the outer diameter of the outer sleeve 6, so as to ensure that the horizontal deformation of the disc spring element 2 can be effectively controlled without affecting the normal vertical deformation of the disc spring element 2.

[0031] Disc spring element 2 and helical spring element 5 begin to provide stiffness at different stages of vertical deformation, realizing the vertical variable stiffness of the vibration isolation device. Under normal operating conditions, helical spring element 5 functions to provide vibration isolation. When pedestrian loads or other loads are applied to the elevated floor, helical spring element 5 reaches its design deformation limit, and disc spring element 2 intervenes to provide vibration isolation. When disc spring element 2 no longer undergoes vertical deformation, it begins to provide stiffness. The vertical stiffness of disc spring element 2 is more than 10 times that of helical spring element 5, ensuring that disc spring element 2 does not intervene in the vibration isolation work of the support when helical spring element 5 is functioning. Furthermore, the outer sleeve 6 provides horizontal restraint for helical spring element 5.

[0032] Under different working conditions, the vibration isolation bearing can stably maintain its natural frequency of 8Hz, thus avoiding the 10Hz resonance frequency of the building floor slab.

[0033] In this invention, the connecting joint 1, transition plate 3, intermediate guide rod 4, outer sleeve 6, and lower end plate 8 can all be made of high-strength steel or other suitable materials; the polyurethane pad 7 should be made of qualified polyurethane material and should not have excessive elastic deformation under operating conditions.

[0034] The technical solutions provided by the embodiments of the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to helping to understand the principles of the embodiments of the present invention. At the same time, those skilled in the art will know that there will be changes in the specific implementation methods and application scope according to the embodiments of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A detachable, limit-positioned, double-stiffness vibration isolation bearing, characterized in that, include: Connecting joint (1), disc spring element (2), transition plate (3), intermediate guide rod (4), helical spring element (5), outer sleeve (6), polyurethane pad (7), and lower end plate (8); Among them, the middle guide rod (4) passes through the connecting joint (1), the disc spring element (2), the transition plate (3) and the helical spring element (5) from top to bottom, and enters the inner cavity of the outer sleeve (6); the connecting joint (1) is threadedly engaged with the top of the middle guide rod (4); the disc spring element (2) is set between the connecting joint (1) and the transition plate (3); The lower end of the outer sleeve (6) is fixedly connected to the lower end plate (8), and the polyurethane pad (7) is set on the bottom surface inside the outer sleeve (6); the helical spring element (5) is sleeved on the outside of the outer sleeve (6) and the middle guide rod (4), one end of the helical spring element (5) abuts against the lower surface of the transition plate (3), and the other end abuts against the upper surface of the lower end plate (8). There are gaps between the bottom of the intermediate guide rod (4) and the top of the polyurethane pad (7) and between the top of the outer sleeve (6) and the lower surface of the transition plate (3), which ensure that the helical spring element (5) can move freely vertically under the design conditions.

2. The detachable, limit-positioned, double-stiffness vibration isolation bearing according to claim 1, characterized in that, The vertical stiffness of the disc spring element (2) is more than 10 times that of the helical spring element (5).

3. The detachable, limit-positioned, double-stiffness vibration isolation bearing according to claim 1, characterized in that, The disc spring element (2) has a preset deformation of 5 mm under the structural self-weight load, and its vertical limit deformation does not exceed 20 mm.

4. The detachable, limit-positioned, double-stiffness vibration isolation bearing according to claim 1, characterized in that, The helical spring element (5) undergoes a preset deformation of 10 mm under the structural self-weight load, and its vertical limit deformation does not exceed 30 mm.

5. The detachable, limit-positioned, double-stiffness vibration isolation bearing according to claim 1, characterized in that, The diameter of the intermediate guide rod (4) is smaller than the inner diameter of the outer sleeve (6) to ensure that the intermediate guide rod (4) can move up and down relative to the outer sleeve (6).

6. The detachable, limit-positioned, double-stiffness vibration isolation bearing according to claim 1, characterized in that, The inner diameter of the disc spring element (2) is smaller than the outer diameter of the outer sleeve (6).

7. The detachable, limit-positioned, double-stiffness vibration isolation bearing according to claim 1, characterized in that, The natural frequency of the vibration isolation support is below 8 Hz.

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