A tensile isolation device

Abstract

The present invention belongs to the technical field of engineering seismic isolation, and relates to a tensile seismic isolation device, comprising: a seismic isolation bearing and a tensile unit; the seismic isolation bearing includes an upper connecting plate and a lower connecting plate; the tensile unit includes an upper slide rail, a lower slide rail and a slide bar connecting the upper connecting plate, the lower slide rail is vertically arranged with the upper slide rail and is slidably connected with the upper slide rail to form a first sliding block; one end of the slide bar is slidably connected with the lower slide rail to form a second sliding block, and the other end is detachably connected with the lower connecting plate. The device in the present invention not only has the functions of shock absorption and seismic isolation, but also has very strong tensile capacity, and integrates the tensile structure into the seismic isolation bearing to form an integrated structure; at the same time, the key parameters such as the height difference and clearance after the tensile unit and the seismic isolation bearing are pressed can be conveniently adjusted by threads, which is very practical and has high engineering value.

Description

Technical Field

[0001] The present invention relates to a tensile isolation device, belonging to the technical field of engineering isolation. Background Art

[0002] At present, isolation technology has been widely applied in engineering fields such as bridges and buildings, and the commonly used isolation product is a rubber bearing. In recent years, seismic reduction and isolation technology has been widely used in the design of LNG storage tanks. Especially with the trend of large-scale LNG storage tanks, isolation bearings have almost become a standard configuration for ultra-large LNG storage tanks. Conventional isolation bearings have advantages such as good deformation performance, strong reset function, and good durability, but there are also problems such as weak tensile resistance. According to the "Code for Design of Concrete Structures" GB50010-2010 (2015 Edition), the tensile stress of rubber bearings cannot exceed 1 MPa. Therefore, conventional rubber isolation bearings cannot be used in occasions with large tensile force requirements. For a raft-foundation structure with a large diameter, the outermost pile foundation is subjected to a large uplift force under horizontal seismic action, and the corresponding isolation bearing will also be subjected to a large tensile stress. For ultra-large storage tanks, in areas with a slightly higher seismic intensity, the pile foundations of the storage tanks are subjected to a large uplift force. If conventional isolation bearings are used, the diameter of the isolation bearings must be increased to meet the design requirements. Increasing the diameter of the isolation bearing increases the isolation cost on the one hand, and on the other hand, the embedded steel bars of the isolation bearing are prone to conflict with the main reinforcement of the pile foundation after the diameter increases, increasing the construction difficulty, which greatly restricts the development of the industry. Summary of the Invention

[0003] Aiming at the above problems, the purpose of the present invention is to provide an economic, practical, easy-to-disassemble and assemble, and highly integral tensile isolation device.

[0004] To achieve the above purpose, the present invention proposes the following technical solutions: A tensile isolation device includes: an isolation bearing and a tensile unit; the isolation bearing includes an upper connecting plate and a lower connecting plate; the tensile unit includes an upper slide rail, a lower slide rail, and a sliding rod connecting the upper connecting plate. The lower slide rail is perpendicular to the upper slide rail and is slidably connected to the upper slide rail to form a first sliding block; one end of the sliding rod is slidably connected to the lower slide rail to form a second sliding block, and the other end is detachably connected to the lower connecting plate.

[0005] Further, the upper slide rail is a groove straight rail with its groove facing downwards; the lower slide rail is also a straight rail, the upper part of which is in the shape of an I-beam and the lower part is a groove; the protrusion of the I-beam is stuck into the groove of the upper slide rail.

[0006] Further, limiting parts are arranged at both ends of the groove of the upper slide rail and the lower groove of the lower slide rail, and the distance between the limiting parts is not less than 1.1d, where d is the effective diameter of the isolation bearing.

[0007] Furthermore, the sliding rod includes a horizontal rod and a vertical connecting rod. The horizontal rod is snapped into the groove at the lower part of the lower slide rail. One end of the vertical connecting rod is connected to the horizontal rod, and the other end is connected to the lower connecting plate.

[0008] Furthermore, the upper slide rail is fixed to the upper connecting plate by bolts, and the vertical connecting rod is fixed to the lower connecting plate by bolts. A flat position is provided in the middle of the vertical connecting rod. By rotating the vertical connecting rod at the flat position, the height of the seismic isolation bearing can be finely adjusted by the depth of screwing into the lower connecting plate.

[0009] Furthermore, the vertical connecting rod is a steel bar with a square cross-section.

[0010] Furthermore, when the seismic isolation bearing is subjected to seismic loads in the x direction, the I-shaped protrusion of the lower slide rail slides in the groove of the upper slide rail in the x direction; when the seismic isolation bearing is subjected to seismic loads in the y direction, the horizontal rod of the sliding rod slides in the groove of the lower slide rail in the y direction; when the seismic isolation bearing is subjected to seismic loads between the x and y directions, the sliding distance of the lower slide rail in the x direction is ucos(α), and at the same time, the sliding distance of the sliding rod in the y direction is usin(α), where α is the moving angle of the seismic isolation bearing and u is the moving distance of the seismic isolation bearing.

[0011] Furthermore, the number of tensile units is at least two.

[0012] Furthermore, the number of tensile units is calculated by the following formula:

[0013]

[0014] where σ is the stress required to resist the displacement of the seismic isolation bearing, d is the effective diameter of the seismic isolation bearing, is the diameter of the vertical connecting rod, and s is the allowable stress.

[0015] Furthermore, the side length l top of the upper connecting plate and the side length l bot of the lower connecting plate of the seismic isolation bearing satisfy the following dimensional requirements:

[0016]

[0017]

[0018] where the effective diameter of the seismic isolation bearing is d.

[0019] Due to the adoption of the above technical solutions, the present invention has the following advantages:

[0020] 1. In the device of the present invention, it not only has the functions of shock absorption and vibration isolation, but also has a very strong tensile capacity. The tensile structure is integrated into the isolation bearing, forming an integrated structure. At the same time, the key parameters such as the height difference and clearance after the tensile unit and the isolation bearing bear pressure can be conveniently adjusted through threads, which is very practical and has high engineering value.

[0021] 2. In the present invention, the tensile unit and the upper and lower plates of the isolation bearing are connected by bolts, and the upper slide rail, lower slide rail and slide rod of the tensile unit are connected by card slots. There is no gap for up and down deformation in the whole structure. When the isolation bearing is subjected to a large vertical load, the load is transmitted to the tensile unit through the upper and lower plates of the isolation bearing, and the rubber part of the isolation bearing will not be subjected to tensile force, so as to achieve the tensile effect.

[0022] 3. In the present invention, the upper and lower slide rails of the tensile unit form two sliding pairs in the horizontal direction, and the sliding directions are 90°. It can realize the movement in all horizontal directions and limit the displacement in the vertical direction to protect the rubber part of the isolation bearing from excessive tensile stress or no tensile stress.

[0023] 4. In the present invention, the structure of the tensile unit is simple. It can slide in any horizontal direction without affecting the seismic isolation and vibration reduction performance of the isolation bearing in the horizontal direction, and bears the vertical load of the isolation bearing in the vertical direction to play a tensile role. At the same time, by finely adjusting the vertical deformation amount of the vertical connecting rod at the lower part of the slide rod, deformation coordination can be carried out while tensile in the vertical direction. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of four tensile isolation devices in an embodiment of the present invention, Figure 1 (a) is the front view of the tensile isolation device, Figure 1 (b) is the left view of the tensile isolation device, Figure 1 (c) is the top view of the tensile isolation device;

[0025] Figure 2 is a schematic structural diagram of the tensile unit in an embodiment of the present invention, Figure 2 (a) is the front view of the tensile unit, Figure 2 (b) is the left view of the tensile unit, Figure 2 (c) is the top view of the tensile unit;

[0026] Figure 3 is a schematic structural diagram of the upper slide rail in an embodiment of the present invention, Figure 3 (a) is the front view of the upper slide rail, Figure 3 (b) is the left view of the upper slide rail, Figure 3 (c) is the top view of the upper slide rail;

[0027] Figure 4This is a schematic structural diagram of the lower slide rail in an embodiment of the present invention. Figure 4 (a) is the front view of the lower slide rail. Figure 4 (b) is the left view of the lower slide rail. Figure 4 (c) is the top view of the lower slide rail.

[0028] Figure 5 This is a schematic structural diagram of the sliding rod in an embodiment of the present invention. Figure 5 (a) is the front view of the sliding rod. Figure 5 (b) is the left view of the sliding rod. Figure 5 (c) is the top view of the sliding rod.

[0029] Figure 6 This is a schematic structural diagram of two tensile devices in an embodiment of the present invention. Figure 6 (a) is the front view of the tensile device. Figure 6 (b) is the left view of the tensile device. Figure 6 (c) is the top view of the tensile device.

[0030] Figure 7 This is a schematic structural diagram of the inverted installation direction of the tensile device in an embodiment of the present invention.

[0031] Reference numerals:

[0032] 1 - seismic isolation bearing; 11 - upper connecting plate; 12 - lower connecting plate; 2 - tensile unit; 21 - upper slide rail; 22 - lower slide rail; 23 - sliding rod; 231 - horizontal rod; 232 - vertical connecting rod. Detailed implementation manners

[0033] In order to enable those skilled in the art to better understand the technical direction of the present invention, the present invention is described in detail through specific embodiments. However, it should be understood that the provision of the specific implementation manners is only for better understanding of the present invention, and they should not be construed as limitations on the present invention. In the description of the present invention, it should be understood that the terms used are only for the purpose of description and cannot be construed as indicating or implying relative importance.

[0034] The present invention relates to a tensile seismic isolation device, which includes a seismic isolation bearing 1 and several tensile units 2. The tensile unit 2 has a simple structure and can slide in any horizontal direction without affecting the horizontal seismic isolation and vibration reduction performance of the seismic isolation bearing 1, and can bear the vertical load of the seismic isolation bearing 1 in the vertical direction, playing a tensile role; at the same time, the vertical connecting rod 232 at the lower part of the sliding rod 23 can be finely adjusted for the vertical deformation amount, and deformation coordination can be carried out while tensile in the vertical direction.

[0035] Embodiment 1

[0036] This embodiment discloses a tensile seismic isolation device, as Figure 1As shown in the figure, it includes: a seismic isolation bearing 1 and a tensile unit 2; the seismic isolation bearing 1 includes an upper connecting plate 11 and a lower connecting plate 12; the tensile unit 2 includes an upper slide rail 21, a lower slide rail 22 and a slide bar 23 that are connected to the upper connecting plate 11. The lower slide rail 22 is vertically arranged with the upper slide rail 21 and is slidably connected to the upper slide rail 21 and moved to a suitable position in the middle to form a first sliding block; one end of the slide bar 23 is slidably connected to the lower slide rail 22 and moved to a suitable position in the middle to form a second sliding block, and the other end is detachably connected to the lower connecting plate 12. The upper slide rail 21 and the lower slide rail 22 are arranged at 90° and can slide conveniently, which can meet the movement of the seismic isolation bearing 1 in any direction under the action of an earthquake.

[0037] As Figure 1 shown, there are multiple tensile units 2, such as Figure 1 (c) has four tensile units 2. The number of tensile units 2 can be determined according to needs. The number of tensile units 2 is calculated by the following formula:

[0038]

[0039] In the formula, σ is the stress required to resist the displacement of the seismic isolation bearing 1, d is the effective diameter of the seismic isolation bearing 1, is the diameter of the vertical connecting rod 232, and s is the allowable stress. If there are four tensile units 2, the tensile units 2 are fixed to the upper connecting plate 11 and the lower connecting plate 12 of the seismic isolation bearing 1 by bolts. Both the tensile units 2 and the seismic isolation bearing 1 are independent finished products.

[0040] As Figure 2 , Figure 3 and Figure 4 shown, the upper slide rail 21 is a groove linear guide rail with its groove facing downwards. The upper slide rail 21 is fixed to the upper connecting steel plate of the seismic isolation bearing 1 by six bolts. In this embodiment, it is preferably that the upper slide rail 21 is fixed to the upper connecting plate 11 by bolts. The upper slide rail 21 is provided with grooves and countersunk screw holes. The size of the grooves and the size and number of the screw heads are determined after detailed calculation. After aligning the screw holes of the upper slide rail 21 with the connecting holes of the upper connecting steel plate, the connecting screws are tightened to complete the fixation of the upper slide rail 21. The lower slide rail 22 is also a linear guide rail. Its upper part is in the shape of an I-beam and the lower part is a groove; the I-beam protrusion is stuck into the groove of the upper slide rail 21, and the lower slide rail 22 can slide freely along the axis in the groove of the upper slide rail 21. Limit parts are provided at both ends of the groove of the upper slide rail 21 and the groove at the lower part of the lower slide rail 22. The distance between the limit parts is not less than 1.1d, where d is the effective diameter of the seismic isolation bearing 1.

[0041] As Figure 5As shown in the figure, the sliding rod 23 includes a horizontal rod 231 and a vertical connecting rod 232. The horizontal rod 231 is clamped into the groove at the lower part of the lower slide rail 22, and the horizontal sliding rod 23 can freely slide axially in the groove of the lower slide rail 22. One end of the vertical connecting rod 232 is connected to the horizontal rod 231 by a bolt, and the other end of the vertical connecting rod 232 is provided with a thread, and it is also connected to the lower connecting plate 12 by a bolt. The vertical connecting rod 232 is fixed to the lower connecting plate 12 by a bolt. A flat position is milled in the middle of the vertical connecting rod 232. By rotating the vertical connecting rod 232 at the flat position, the height of the seismic isolation bearing 1 can be finely adjusted by the depth of screwing into the lower connecting plate 12, which can be achieved by using a wrench to hold the flat position in the middle and rotating. In this way, the deformation amount of the rubber bearing in the vertical direction can be controlled, so as to control the magnitude of the tensile stress received by the rubber part of the seismic isolation bearing 1, and the coordinated force of each tensile unit 2 can be ensured. The tensile unit 2 is connected to the upper and lower plates of the seismic isolation bearing 1 by bolts, and the upper slide rail 21, the lower slide rail 22 and the sliding rod 23 of the tensile unit 2 are connected by card slots. There is no gap for up and down deformation in the whole structure. When the seismic isolation bearing 1 is subjected to a large vertical load, the load is transmitted to the tensile unit 2 through the upper and lower plates of the seismic isolation bearing 1, and the rubber part of the seismic isolation bearing 1 will not be subjected to tension, so as to achieve the tensile effect.

[0042] In this embodiment, the vertical connecting rod 232 is preferably a steel bar with a square cross-section. This design is suitable for the situation where there is a large space for the bearing, which is convenient for controlling the screwing depth of the connecting rod thread.

[0043] Assume that the sliding direction of the first sliding block is the x direction and the sliding direction of the second sliding block is the y direction. When the seismic isolation bearing 1 is subjected to a seismic load in the x direction, the I-shaped protrusion of the lower slide rail 22 slides in the groove of the upper slide rail 21 in the x direction; when the seismic isolation bearing 1 is subjected to a seismic load in the y direction, the horizontal rod 231 of the sliding rod 23 slides in the groove of the lower slide rail 22 in the y direction; when the seismic isolation bearing 1 is subjected to a seismic load between the x and y directions, assume that the center of the seismic isolation bearing 1 moves along an angle α by a distance u from (0,0), then the lower slide rail 22 slides a distance of ucos(α) in the x direction, and the lower slide rail 22 slides a distance of ucos(α) in the x direction, and at the same time, the sliding rod 23 slides a distance of usin(α) in the y direction, where α is the moving angle of the seismic isolation bearing 1 and u is the moving distance of the seismic isolation bearing 1. It can be seen from this that installing the tensile unit 2 on the seismic isolation bearing 1 will not affect its deformation in the horizontal direction, and thus will not affect the seismic isolation and vibration reduction function of the seismic isolation bearing 1.

[0044] Let the effective diameter of the seismic isolation bearing 1 be d. According to the requirements of the "Code for Design of Concrete Structures" GB 50010-2010 (2015 Edition), the maximum horizontal displacement of the bearing is 0.55d, and the minimum distance between the bolt and the edge of the plate is l bolt, the above parameters are determined according to the design specifications. Based on the above parameters, the size of the connecting plate is determined to meet the following requirements:

[0045]

[0046]

[0047] Among them, the effective diameter of the seismic isolation bearing 1 is d.

[0048] Embodiment 2

[0049] Based on the same inventive concept, this embodiment discloses a tensile seismic isolation device. Compared with Embodiment 1, as Figure 6 shown, in this embodiment, the number of tensile units 2 is two. In this embodiment, the installation positions of the tensile units 2 change from the four corners of the connecting plate to the central positions of the short sides. By adjusting the number of tensile units 2, it can better adapt to the space for installing the seismic isolation bearing 1. When the space in the x direction is small and the space in the y direction is large, it may not be possible to install four tensile units 2. At this time, the situation of this embodiment can be adopted for installation.

[0050] Embodiment 3

[0051] Based on the same inventive concept, this embodiment discloses a tensile seismic isolation device. Compared with Embodiment 1, as Figure 7 shown, the main difference is that the tensile unit 2 is installed upside down, the size of the upper connecting plate 11 is small, and the size of the lower connecting plate 12 is large. By changing the installation direction of the tensile unit 2, it can better adapt to the structure of the seismic isolation bearing 1. When the pier is on the upper part and this device needs to be installed between the pier and the raft foundation, since the size of the pier is relatively small and the space of the raft foundation available for installing the bearing is large, the situation of this embodiment can be adopted for installation at this time.

[0052] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications or equivalent replacements can still be made to the specific embodiments of the present invention. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the protection scope of the claims of the present invention. The above content is only the specific embodiment of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application, and all should be covered within the protection scope of this application. Therefore, the protection scope of this application should be based on the protection scope of the claims.

Claims

1. A tensile isolation device, characterized in that, Comprising: A seismic isolation bearing and a tensile unit; The seismic isolation bearing includes an upper connecting plate and a lower connecting plate; The tensile unit includes an upper slide rail, a lower slide rail and a slide bar connecting the upper connecting plate. The lower slide rail is vertically arranged with the upper slide rail and is slidably connected to the upper slide rail to form a first sliding pair; one end of the slide bar is slidably connected to the lower slide rail to form a second sliding pair, and the other end is detachably connected to the lower connecting plate; When the seismic isolation bearing is subjected to seismic loads in the x direction, the I-shaped protrusion of the lower slide rail slides in the groove of the upper slide rail in the x direction; when the seismic isolation bearing is subjected to seismic loads in the y direction, the horizontal bar of the slide bar slides in the groove of the lower slide rail in the y direction; when the seismic isolation bearing is subjected to seismic loads between the x and y directions, the sliding distance of the lower slide rail in the x direction is ucos(α), and at the same time the sliding distance of the slide bar in the y direction is usin(α), where α is the moving angle of the seismic isolation bearing and u is the moving distance of the seismic isolation bearing; The side length l of the upper connecting plate of the seismic isolation bearing top and the side length l of the lower connecting plate bot meet the following dimensional requirements: In the formula, the effective diameter of the seismic isolation bearing is d, and l bolt is the minimum distance between the bolt and the edge of the plate.

2. The tensile isolation device according to claim 1, characterized in that The upper slide rail is a groove straight guide rail with its groove facing downwards; the lower slide rail is also a straight guide rail, with its upper part in the shape of an I and its lower part in the shape of a groove; the I-shaped protrusion is stuck into the groove of the upper slide rail.

3. The tensile isolation device according to claim 2, wherein Limit parts are provided at both ends of the groove of the upper slide rail and the lower groove of the lower slide rail, and the distance between the limit parts is not less than 1.1d, where d is the effective diameter of the seismic isolation bearing.

4. The tensile isolation device according to claim 1, characterized in that, The slide bar includes a horizontal bar and a vertical connecting rod. The horizontal bar is stuck into the lower groove of the lower slide rail, and one end of the vertical connecting rod is connected to the horizontal bar and the other end is connected to the lower connecting plate.

5. The tensile isolation device according to claim 4, characterized in that, The upper slide rail is fixed to the upper connecting plate by bolts, the vertical connecting rod is fixed to the lower connecting plate by bolts, and a flat position is provided in the middle of the vertical connecting rod. Rotating the vertical connecting rod at the flat position can finely adjust the height of the seismic isolation bearing by the depth of screwing into the lower connecting plate.

6. The tensile isolation device according to claim 5, wherein The vertical connecting rod is a steel bar with a square cross-section.

7. The tensile isolation device according to claim 4, characterized in that, The number of the tensile units is at least two.

8. The tensile isolation device according to claim 7, characterized in that, The number of the tensile units is calculated by the following formula: Wherein, σ is the stress required to resist the displacement of the seismic isolation bearing, d is the effective diameter of the seismic isolation bearing, is the diameter of the vertical connecting rod, and s is the allowable stress.

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