A steel helical spring friction pendulum vibration dual-control support and its construction method

Abstract

This invention discloses a steel helical spring friction pendulum vibration-controlled support and its construction method. The vibration-controlled support includes a vertical vibration isolator and a horizontal vibration isolation device, which are connected in series vertically. The vertical vibration isolator is located on one side of the horizontal vibration isolation device. Only a vibration isolation spring is installed between the upper and lower cover plates of the vertical vibration isolator, and there is no horizontal limiting device between the upper and lower cover plates, giving the vertical vibration isolator a multi-directional movement tendency. The horizontal stiffness of the vibration-controlled support is smaller than that of the friction pendulum vibration isolation support, and it has a horizontal energy dissipation function. When applied to subway superstructures or connecting corridor seismic isolation structures, it can effectively reduce the wear of the support under temperature deformation. When applied to connecting corridors, it can effectively reduce the vibration of the corridor under wind-induced or human-induced loads.

Description

Technical Field

[0001] This invention relates to the field of seismic isolation bearing technology, specifically to a steel helical spring friction pendulum vibration dual-control bearing and its construction method. Background Technology

[0002] In recent years, the Transit-Oriented Development (TOD) model, an urban spatial development model oriented towards rail transit hubs, has gradually become the mainstream development model in major cities. However, the vibration and disturbance problems caused by transportation operations are becoming increasingly prominent. Many TOD buildings face the dual threats of traffic vibration and earthquakes, severely restricting urban development. For example, the vibration-controlled bearings disclosed in CN114197935A and CN114135138A can reduce the vertical seismic or rail transit vibration response through lower vertical stiffness, while reducing the horizontal seismic action on the superstructure through horizontal seismic isolation, thus protecting the safety of the superstructure.

[0003] Vibration-isolation dual-control bearings are typically composed of vertical vibration isolation bearings and seismic isolation bearings with low stiffness connected in series, so that the vertical vibration isolation bearings and seismic isolation bearings are integrated into one unit, and the horizontal and vertical performances are coupled, so as to achieve the functions of vertical vibration isolation and horizontal seismic isolation at the same time. They are suitable for installation inside buildings.

[0004] Common vertical vibration isolation supports are composed of thick-layered rubber, air springs, steel springs, etc. Among them, metal springs are often used in practical engineering due to their lower achievable vibration frequencies and simple structure. Currently, steel helical spring units mainly have springs arranged vertically and equipped with vertical guide units for limiting, or lateral constraint units are used to restrict lateral displacement to ensure reasonable deformation and safety of the springs under rare earthquakes. In actual stress processes, these lateral constraint devices are prone to axial friction due to horizontal deformation, which may reduce the vertical vibration reduction effect. Furthermore, in vibration-controlled supports connected in series with friction pendulum supports, temperature-induced horizontal deformation also leads to vertical lifting, causing varying degrees of vertical force redistribution in the supports, increasing the uncertainty of the vibration reduction effect. This invention provides a steel helical spring friction pendulum vibration-controlled support and its construction method to solve the above problems. Summary of the Invention

[0005] This invention provides a steel helical spring friction pendulum vibration dual-control bearing and its construction method, which can be applied to the seismic isolation structure of subway superstructure or connecting corridor to reduce the wear of the bearing under temperature deformation. When applied to connecting corridors, it can also effectively reduce the vibration of the connecting corridors under wind-induced or human-induced loads.

[0006] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows:

[0007] A steel helical spring friction pendulum vibration dual-control support includes a vertical vibration isolator and a horizontal vibration isolation device, wherein the vertical vibration isolator and the horizontal vibration isolation device are connected in series vertically, and the vertical vibration isolator is located above or below the horizontal vibration isolation device.

[0008] The vertical vibration isolator includes a cover plate and vibration isolation springs. The cover plate includes an upper cover plate and a lower cover plate. The vibration isolation springs are disposed between the upper cover plate and the lower cover plate. The horizontal vibration isolation device is connected to the cover plate. The vibration isolation springs include vertical springs and inclined springs. The vertical springs and inclined springs are disposed alternately between the upper cover plate and the lower cover plate.

[0009] Furthermore, the tilting springs are arranged in groups, and the groups of tilting springs are arranged in a centrally symmetrical manner.

[0010] Furthermore, the upper end of the tilting spring is tilted outward, and the angle between it and the vertical is α, with the tilt angle of α being 0°-90°.

[0011] The ratio of the horizontal stiffness of the vertical vibration isolator to the horizontal stiffness of the horizontal vibration isolation device is 0.5-2, and the specific value of the included angle is determined accordingly, calculated using the following formula:

[0012] And 90°>α≥0°,

[0013] Among them, f n Target vibration isolation frequency, unit: Hz;

[0014] F: Support design bearing capacity, unit: kN;

[0015] K P : Horizontal stiffness of horizontal seismic isolation device, unit: kN / m;

[0016] α: The angle between the tilting direction of the spring and the vertical direction, in degrees;

[0017] n1: Number of vertical springs in the vertical vibration isolator, unit: number;

[0018] n2: Number of tilting springs in the vertical vibration isolator, unit: number;

[0019] g: acceleration due to gravity, unit: m / s² 2 .

[0020] Furthermore, the tilting spring is equipped with a damper.

[0021] Furthermore, the tilting spring is disposed on the side of the cover plate.

[0022] Furthermore, the tilting spring is mounted on the cover plate via a mounting platform, the surface of which is a slope, and the tilting spring is positioned perpendicular to the surface of the mounting platform.

[0023] Furthermore, the horizontal vibration isolation device is a friction pendulum vibration isolation support.

[0024] A construction method for a steel helical spring friction pendulum vibration dual-control support includes the following steps:

[0025] S1, Lower support pier construction: Bind the steel cage of the lower support pier, install the lower embedded parts, measure the flatness of the top surface of the support pier, and then pour the lower support pier.

[0026] S2, Support installation: First, the support is compressed by pre-compression, and then locked with a locking device to make the support in a compressed state. The compressed support is then transported to the construction site and installed on the lower support pier.

[0027] S3, Superstructure construction: Install the upper embedded parts, tie the upper support steel cage, and then carry out the superstructure construction.

[0028] S4, Support Release: After the superstructure construction is completed, the support is released. A jack is placed between the support and the lower pier or between the support and the superstructure. The jack is driven to further compress the support, the locking device is loosened, and then the jack is released slowly until the support contacts the lower pier and the superstructure, thus completing the support release.

[0029] The beneficial effects of this invention are as follows:

[0030] In the vertical vibration isolator, only vibration isolation springs are installed between the upper and lower cover plates, and there is no horizontal limiting device between the upper and lower cover plates, which makes the vertical vibration isolator have a multi-directional motion tendency.

[0031] The horizontal stiffness of the vibration-controlled bearing is smaller than that of the friction pendulum seismic isolation bearing, and it has the function of dissipating energy in the horizontal direction. When applied to the seismic isolation structure of subway superstructure or connecting corridor, it can effectively reduce the wear of the bearing under temperature deformation of the building or connecting corridor; and when applied to connecting corridor, it can effectively reduce the vibration of the connecting corridor under wind-induced or human-induced loads.

[0032] The vertical vibration isolator uses a rodless vibration isolation spring to connect the upper and lower cover plates. The centrally symmetrically arranged inclined springs enable the vertical vibration isolator to have both horizontal limiting function and provide a certain horizontal stiffness. Its horizontal stiffness is comparable to that of the friction pendulum vibration isolation support, while its vertical stiffness is much smaller than the latter. Therefore, the two are connected in series to achieve decoupling of horizontal seismic motion and vertical vibration without interference. The decoupling of horizontal and vertical vibration isolation makes the design and analysis of vibration isolation of building structures more convenient. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the split-type overall structure of the present invention in the locked state;

[0034] Figure 2 This is a cross-sectional view of the overall structure of the present invention;

[0035] Figure 3 This is a schematic diagram of the lateral pressure vibration state of the present invention;

[0036] Figure 4 This is a schematic diagram of the integrated structure of the present invention in the locked state;

[0037] Figure 5 This is a constitutive model variation diagram of the vertical load-horizontal displacement hysteresis curve of the present invention.

[0038] Reference numerals: 1. Vertical vibration isolator; 11. Cover plate; 12. Vibration isolation spring; 121. Vertical spring; 122. Inclined spring; 2. Horizontal vibration isolation device. Detailed Implementation

[0039] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] like Figure 1 , 2 As shown in Figures 3 and 4, a steel helical spring friction pendulum vibration dual-control support includes a vertical vibration isolator 1 and a horizontal vibration isolation device 2. The vertical vibration isolator 1 and the horizontal vibration isolation device 2 are connected in series vertically. The vertical vibration isolator 1 is located above or below the horizontal vibration isolation device 2. The vertical vibration isolator 1 includes a cover plate 11 and a vibration isolation spring 12. The cover plate 11 includes an upper cover plate and a lower cover plate. The horizontal vibration isolation device 2 is connected to the upper cover plate or the lower cover plate. The vibration isolation spring 12 is located between the upper cover plate and the lower cover plate. The vibration isolation spring 12 is composed of a vertical spring 121 in a compressed state and an inclined spring 122.

[0042] like Figure 1 , 2As shown in Figures 3 and 4, in a specific embodiment of the present invention, the vertical vibration isolator 1 and the horizontal vibration isolation device 2 are arranged in series, with the vertical vibration isolator 1 positioned above the horizontal vibration isolation device 2. The vertical vibration isolator 1 adopts a structure consisting of an upper cover plate, a lower cover plate, a vertical spring 121, and an inclined spring 122. The horizontal vibration isolation device 2 is fixedly connected below the lower cover plate. The vertical vibration isolator 1 has a box-shaped structure. The vibration isolation springs 12 are spaced apart between the upper and lower cover plates. The vertical springs 121 are located in the middle and corners of the cover plate 11. The inclined springs 122 are arranged in groups and located on the side of the cover plate 11. Multiple groups of inclined springs 122 are arranged symmetrically at the center. The upper end of the inclined spring 122 is inclined outward, and the angle between the inclined spring 122 and the vertical direction is [value missing]. The upper and lower ends are respectively connected to the mounting platform on the cover plate 11. The tilting spring 122 is installed and fixed by the mounting platform with corresponding slope. At the same time, a damper is set in the tilting spring 122. Through the above settings, the vertical vibration isolator 1 has a horizontal limiting function and provides a certain horizontal stiffness when no horizontal limiting device is set. The horizontal vibration isolation device 2 is a friction pendulum vibration isolation support, including a slide rail and a spherical crown. The slide rail includes an upper slide rail and a lower slide rail. The upper and lower slide rails are spherical surfaces covered with polytetrafluoroethylene plates, modified polytetrafluoroethylene plates, or modified ultra-high molecular weight polyethylene plates. The middle of the upper and lower slide rails is a spherical crown with an ultra-low friction coefficient coating inside. It has an extremely low horizontal friction coefficient, which greatly reduces the energy transmitted by the seismic action and mitigates the seismic response of the superstructure.

[0043] like Figure 1 , 4 As shown, when the vertical vibration isolator 1 and the horizontal vibration isolation device 2 are connected, they can be either integrated box-type structures or independent split structures, depending on the building structure. When an integrated structure is used, the upper slide rail and the lower cover plate of the horizontal vibration isolation device 2 are integrated structures. When a split structure is used, the upper slide rail and the lower cover plate of the horizontal vibration isolation device 2 are independent structures and are connected by bolts.

[0044] like Figure 1 , 2As shown in Figures 3 and 5, the working principle of this embodiment is as follows: the vertical vibration isolator 1 bears the vertical deformation, and the vertical deformation is borne by the combined action of the vertical spring 121 and the inclined spring 122, thereby reducing the vertical vibration frequency of the structure and achieving vertical vibration isolation; the friction pendulum vibration isolation support is used as the horizontal vibration isolation device 2 to bear the horizontal deformation, reduce the horizontal displacement of the structure, and achieve horizontal vibration isolation. The vertical vibration isolator 1 does not have guide rods, and there is no horizontal limiting structure between the upper and lower cover plates. The inclined springs 122 arranged in a central symmetry enable the vertical vibration isolator 1 to have both horizontal limiting function and a certain horizontal stiffness. The horizontal stiffness of the vertical vibration isolator 1 is comparable to that of the horizontal vibration isolation device 2, while the vertical stiffness is much smaller than the latter. Therefore, the two are connected in series to achieve horizontal and vertical vibration isolation without interference, and the horizontal and vertical vibration isolation are basically decoupled. This makes the vibration isolation design and analysis of building structures more convenient and can effectively simplify the complexity of the analysis. At the same time, the vertical vibration isolator 1 has a certain horizontal stiffness. When connected in series with the horizontal vibration isolation device 2, it can reduce the wear of the supports of the building or corridor under temperature deformation and improve the service life of the supports. The inclined springs 122 make the vertical vibration isolator 1 have a multi-directional motion tendency. When the supports are applied to the corridor structure, they can effectively reduce the vibration of the corridor under wind-induced or human-induced loads, ensuring structural safety and stability.

[0045] Figure 5 The diagram shows the variation of the vertical load-horizontal displacement hysteresis curve of the vibratory-controlled bearing, representing the constitutive model variation of the vibratory-controlled bearing compared to a conventional friction pendulum isolation bearing. The vertical isolator 1 possesses a certain horizontal stiffness through the inclined spring 122, but its horizontal stiffness is smaller than that of the vertical isolator with a limit device. The horizontal stiffness of the vertical isolator with the limit device connected in series with the friction pendulum isolation bearing is equal to that of the friction pendulum isolation bearing. However, the horizontal stiffness of the vibratory-controlled bearing, composed of the vertical isolator 1 and the horizontal isolation device 2 connected in series, is smaller than that of the friction pendulum isolation bearing. The smaller the horizontal stiffness, the larger the horizontal slip displacement of the bearing. Under temperature deformation before horizontal seismic action occurs, the vibratory-controlled bearing is less prone to horizontal slippage, thus effectively reducing bearing wear under temperature deformation.

[0046] Figure 5 In the diagram, D represents the horizontal displacement of the support.

[0047] F: Horizontal restoring force of the support;

[0048] d1: Sliding displacement of ordinary friction pendulum isolation bearing;

[0049] d2: Sliding displacement of the steel helical spring friction pendulum vibration dual-control support.

[0050] Furthermore, the upper end of the tilting spring 122 is tilted outward, and the angle between it and the vertical direction is α, with the tilt angle of α being 0°-90°.

[0051] The vertical vibration isolator 1 has a certain horizontal stiffness by setting the tilting spring 122. In actual installation, the horizontal stiffness of the vertical vibration isolator 1 needs to be comparable to the horizontal stiffness of the horizontal vibration isolation device 2, with a ratio range of 0.5-2. The specific value of the included angle α is determined based on the specific ratio. Similarly, the ratio of the horizontal stiffness of the vertical vibration isolator 1 to the horizontal stiffness of the horizontal vibration isolation device 2 can also be controlled based on the specific value of the included angle α. The two values ​​are determined as dependent or independent variables in the formula according to the actual situation.

[0052] The relationship between the included angle α and the ratio of horizontal stiffness is calculated using the following formula:

[0053] And 90°>α≥0°,

[0054] Among them, f n Target vibration isolation frequency, unit: Hz;

[0055] F: Support design bearing capacity, unit: kN;

[0056] K P : Horizontal stiffness of horizontal seismic isolation device, unit: kN / m;

[0057] α: The angle between the tilting direction of the spring and the vertical direction, in degrees;

[0058] n1: Number of vertical springs in the vertical vibration isolator, unit: number;

[0059] n2: Number of tilting springs in the vertical vibration isolator, unit: number;

[0060] g: acceleration due to gravity, unit: m / s² 2 .

[0061] Furthermore, the inclined spring 122 is equipped with a damper, which is sleeved on the outside of the damper and coaxially arranged with it. The damper further enhances the vertical load-bearing capacity of the inclined spring 122, while also improving its horizontal stiffness and buffering energy dissipation capacity. Since the damper and inclined spring 122 are coaxially arranged, they are considered as a single unit, working together to provide both vertical load-bearing capacity and horizontal stiffness.

[0062] like Figure 1 , 2As shown, the tilting spring 122 is further mounted on the cover plate 11 via a mounting platform, which enables the tilting spring 122 to be installed at an angle. The surface of the mounting platform is a slope, and the tilting spring 122 is set perpendicular to the surface of the mounting platform.

[0063] Furthermore, the vertical spring 121 and the inclined spring 122 are in a compressed state during use.

[0064] A construction method for a steel helical spring friction pendulum vibration dual-control support includes the following steps:

[0065] S1, Lower support pier construction: Bind the steel cage of the lower support pier, install the lower embedded parts, measure the flatness of the top surface of the support pier, and then pour the lower support pier.

[0066] S2, Support Installation: First, install the vibration-damping dual-control support. After installation, compress the vibration-damping dual-control support using a pre-compression method, and then lock it with bolts. When locking the bolts, the upper and lower ends of the bolts are locked to the cover plate by nuts, and the middle part of the bolt passes through the vertical spring 121 located at the corner to lock the vibration-damping dual-control support, so that the vibration isolation spring 12 in the vibration-damping dual-control support is in a compressed state. Then, the vibration-damping dual-control support in the compressed state is transported to the construction site and installed on the lower support pier.

[0067] S3, Superstructure construction: Install the upper embedded parts, tie the upper support steel cage, and then carry out the superstructure construction.

[0068] S4, Support Release: After the superstructure construction is completed, the vibration-controlled bearing is released. A jack is placed between the vibration-controlled bearing and the lower pier or between the vibration-controlled bearing and the superstructure. The jack is used to further compress the vibration-controlled bearing, so that the bolts locking the vibration-controlled bearing can be released. After driving the jack to further compress the bearing, the locking device is released. Then, the jack is released slowly to release the locked vibration-controlled bearing until it contacts the lower pier and the superstructure, thus completing the release of the locked vibration-controlled bearing. This provides both vertical and horizontal vibration isolation for the building structure or connecting corridor structure. After the locked vibration-controlled bearing is released, the vibration isolation spring 12 remains in a compressed state. The friction pendulum vibration isolation bearing remains under pressure during use and does not lose its vibration isolation function.

[0069] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention, and no reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A steel helical spring friction pendulum vibration dual-control support, characterized in that: It includes a vertical vibration isolator (1) and a horizontal vibration isolation device (2), wherein the vertical vibration isolator (1) and the horizontal vibration isolation device (2) are connected in series, and the vertical vibration isolator (1) is located above or below the horizontal vibration isolation device (2); The vertical vibration isolator (1) includes a cover plate (11) and a vibration isolation spring (12). The cover plate (11) includes an upper cover plate and a lower cover plate. The vibration isolation spring (12) is disposed between the upper cover plate and the lower cover plate. The horizontal vibration isolation device (2) is connected to the cover plate (11). The vibration isolation spring (12) includes a vertical spring (121) and an inclined spring (122). The vertical spring (121) and the inclined spring (122) are disposed at intervals between the upper cover plate and the lower cover plate. The tilting springs (122) are arranged in groups, and the groups of tilting springs (122) are arranged in a centrally symmetrical manner; The upper end of the inclined spring (122) is inclined outward, and the angle between it and the vertical is α, and the inclination angle of α is 0°-90°. The ratio of the horizontal stiffness of the vertical vibration isolator (1) to the horizontal stiffness of the horizontal vibration isolation device (2) is 0.5-2, and the specific value of the included angle is determined accordingly by the following formula: And 90°>α≥0°, Among them, f n Target vibration isolation frequency, unit: Hz; F: Support design bearing capacity, unit: kN; K P : Horizontal stiffness of horizontal seismic isolation device, unit: kN / m; α: The angle between the tilting direction of the spring and the vertical direction, in degrees; n1: Number of vertical springs in the vertical vibration isolator, unit: number; n2: Number of tilting springs in the vertical vibration isolator, unit: number; g: acceleration due to gravity, unit: m / s² 2 .

2. The steel helical spring friction pendulum vibration dual-control support according to claim 1, characterized in that: The tilting spring (122) is equipped with a damper.

3. The steel helical spring friction pendulum vibration dual-control support according to claim 1, characterized in that: The tilting spring (122) is disposed on the side of the cover plate (11).

4. The steel helical spring friction pendulum vibration dual-control support according to claim 1, characterized in that: The tilting spring (122) is mounted on the cover plate (11) via a mounting platform. The surface of the mounting platform is a slope, and the tilting spring (122) is set perpendicular to the surface of the mounting platform.

5. The steel helical spring friction pendulum vibration dual-control support according to claim 1, characterized in that: The horizontal isolation device (2) is a friction pendulum isolation support.

6. The construction method of a steel helical spring friction pendulum vibration dual-control support according to claim 1, characterized in that, Includes the following steps, S1, Lower support pier construction: Bind the steel cage of the lower support pier, install the lower embedded parts, measure the flatness of the top surface of the support pier, and then pour the lower support pier. S2, Support installation: First, the support is compressed by pre-compression, and then locked with a locking device to make the support in a compressed state. The compressed support is then transported to the construction site and installed on the lower support pier. S3, Superstructure construction: Install the upper embedded parts, tie the upper support steel cage, and then carry out the superstructure construction. S4, Support Release: After the superstructure construction is completed, the support is released. A jack is placed between the support and the lower pier or between the support and the superstructure. The jack is driven to further compress the support, the locking device is loosened, and then the jack is released slowly until the support contacts the lower pier and the superstructure, thus completing the support release.

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