High-bearing capacity seismic isolation bearing and manufacturing method thereof

Abstract

The present invention discloses a high-load-bearing capacity seismic isolation bearing, comprising an external connecting steel plate, an internal connecting steel plate, a stiffening steel plate, and an elastomer, wherein the elastic body and the stiffening steel plate are overlapped between two of the internal connecting steel plates, and the two internal connecting steel plates are fixedly connected to the corresponding external connecting steel plates respectively; the characteristic is that it also comprises an elastic washer, which is arranged between the stiffening steel plates and between the stiffening steel plates and the internal connecting steel plates; the internal connecting steel plates, stiffening steel plates, and elastic washers are all provided with positioning holes for positioning and installation of the three; the elastomer is arranged in the gap between the internal connecting steel plates, stiffening steel plates, and elastic washers, and the elastomer is arranged in the positioning holes of the three. The seismic isolation bearing of the present invention can effectively achieve shock absorption and high load-bearing capacity for structures such as bridges.

Description

Technical Field

[0001] The present invention belongs to the technical field of engineering vibration reduction, and in particular relates to a high-bearing-capacity seismic isolation bearing and a manufacturing method thereof. Background Art

[0002] In the engineering field, such as bridge engineering, a large number of non-isolation steel bearings and spherical bearings have been used in the past. They cannot effectively isolate the bridge under the action of the operating load, especially during earthquakes, which can easily lead to damage to the bridge structure.

[0003] The plate rubber bearings currently used in China mainly include ordinary rubber bearings, lead core rubber bearings and high damping rubber bearings.

[0004] like Figure 1 As shown in the figure, the structure of a conventional ordinary rubber bearing is shown. This rubber bearing is made by distributing multiple layers of steel plates 1 inlaid in rubber 2, and its upper and lower surfaces are both rubber layers, and the overall cross-sectional shape is rectangular or circular. Since there is no direct connection with the bottom of the bridge beam, this bearing is prone to slipping, affecting the safety of the bridge structure. Especially when an earthquake occurs, since the bearing is not connected to the bridge, it is easy for the bearing to slip or fall off, and it cannot play a role in seismic isolation. In addition, the damping ratio of this rubber bearing is generally only about 5%, and the seismic isolation ability is poor, making it difficult to reduce the seismic response of the structure.

[0005] Figure 2 The structure of the lead core seismic isolation rubber bearing in the prior art is shown in FIG. Figure 2As shown in the figure, the lead rubber bearing includes two layers of upper and lower external connecting steel plates 1'. The bearing core is connected to the external connecting steel plates 1' through upper and lower sealing plates 2', and a shear key 5' is provided between the sealing plate and the external connecting steel plate to drive the bearing to produce relative displacement in the horizontal direction. The bearing core is formed by staggered stacking of rubber layers 6' and stiffening steel plates 3' for improving vertical bearing capacity, and multiple lead rods 4' are inserted along the vertical direction to further improve the damping performance of the bearing as a whole. The bearing as a whole can be in a rectangular or circular cross-sectional shape. The lead core layer 4' is directly fitted between the two layers of external connecting steel plates, and the stiffening steel plate 3' is also connected to the external connecting steel plate 1' through the sealing plate 2' and using hexagon socket screws 7'. After the external connecting steel plates and their core are assembled, they are connected to the bottom of the bridge beam and the top of the pier respectively through sleeve bolts 8', thereby playing a vibration reduction role as a bridge bearing. This type of lead rubber bearing has the performance of an ordinary plate rubber bearing, while solving the shortcomings of ordinary plate rubber bearings in terms of seismic resistance. However, this type of lead rubber bearing has poor vertical bearing capacity, and in order to improve the damping ratio of the bearing, it is necessary to add a lead core to the bearing to reduce the seismic response of the structure. However, lead is a highly polluting metal. Whether in the production process or in the use process, lead metal will leak out and cause great pollution to the environment. Currently, there are very strict restrictions on the use of lead both domestically and internationally. Therefore, lead rubber bearings are contrary to the current environmental protection trend. Moreover, the rubber of the lead isolation rubber bearing will harden rapidly at low temperatures, and the lead rod will undergo fatigue shear failure under low-cycle repeated loads, thereby significantly reducing the damping of the bearing.

[0006] Figure 3 The structure of a conventional high damping seismic isolation rubber bearing in the prior art is shown in FIG. Figure 3 As shown in the figure, the rubber bearing includes two layers of upper and lower external connecting steel plates 11, and the core body (the core body is formed by alternatingly stacking stiffening steel plates 13 and high damping rubber layers 15) is connected to the external connecting steel plates 11 through upper and lower sealing plates 12 and hexagon socket screws 16, and a shear key 14 is provided between the sealing plate and the external connecting steel plate. After the assembly of the external connecting steel plate and its core body is completed, it is connected to the bottom of the bridge beam through a sleeve bolt 17. For this type of rubber bearing, a good seismic isolation effect can be achieved without adding a lead core, and its damping ratio can reach more than 20%. However, its vertical bearing capacity is poor, and it is difficult to meet the load-bearing requirements in large-span continuous beam bridges and most cable-stayed bridges.

[0007] At present, in large-span continuous beam bridges, due to the heavy weight of the superstructure, the seismic isolation devices usually use very large rubber bearings to bear the vertical load. The installation of the bearings requires a very large space, and the installation process is very cumbersome, making construction very inconvenient. For the various types of traditional seismic isolation bearings, it is difficult to replace the bearings during the construction of such bridges or after they are completed and put into use if there are changes in the geology or the seismic fortification intensity. In cable-stayed bridges, the entire bridge structure usually adopts a semi-floating system. Due to the heavy weight of the superstructure and the long natural vibration period, steel bearings and dampers are usually used to control the structural displacement, but the cost is relatively high. Summary of the Invention

[0008] In response to at least one of the above defects or improvement needs in the prior art, the present invention provides a high-bearing-capacity seismic isolation bearing and a manufacturing method thereof. The seismic isolation bearing can effectively achieve shock absorption and high bearing capacity for structures such as bridges, and has the advantages of appropriate damping, strong displacement control capability, easy self-recovery, outstanding durability, and convenient construction.

[0009] To achieve the above objectives, according to one aspect of the present invention, a high-load-bearing capacity seismic isolation bearing is provided, comprising an outer connecting steel plate, an inner connecting steel plate, a stiffening steel plate, and an elastic body, wherein the elastic body and the stiffening steel plate are overlapped between two inner connecting steel plates, and the two inner connecting steel plates are respectively fixedly connected to corresponding outer connecting steel plates; the characteristics of the present invention are as follows:

[0010] It also includes elastic washers, which are arranged between the stiffening steel plates and between the stiffening steel plates and the inner connecting steel plates;

[0011] The inner connecting steel plate, the stiffening steel plate and the elastic washer are all provided with positioning holes for positioning and installing the three;

[0012] The elastic body is arranged in the gaps between the inner connecting steel plate, the stiffening steel plate and the elastic washer, and the elastic body is arranged in the positioning holes of the three.

[0013] Preferably, a keyway is provided in the middle of the inner connecting steel plate, and a shear key between the inner connecting steel plate and the outer connecting steel plate is provided in the keyway.

[0014] Preferably, the elastomer is a polyurethane elastomer; preferably, the elastic gasket and the elastomer are made of the same material.

[0015] To achieve the above object, according to a second aspect of the present invention, there is also provided a method for preparing a modified polyurethane elastomer for a high-bearing-capacity seismic isolation bearing, characterized in that:

[0016] Step S1, preparation of material A:

[0017] First, preheat the TDI prepolymer and pump the prepolymer into tank A. After the material is added, stir and vacuum. Turn off the stirring of material A and observe the light sight glass. If there are no bubbles in the tank, pump quietly.

[0018] Step S2, preparation of material B:

[0019] Heat the MOCA solid particles until they are melted, and draw the material into tank B. After the material is added, vacuum is drawn while stirring, and the temperature is raised to keep warm;

[0020] Step S3: Mixing and preparation:

[0021] The TDI prepolymer prepared in step S1-2 is mixed with MOCA in a weight ratio of 100:10-25.

[0022] Preferably, in step S1, the preheating temperature is 80-85°C; preferably, vacuuming is performed for 30-35 minutes, preferably, static vacuuming is performed for 10-15 minutes;

[0023] Preferably, in step S2, the temperature is raised to 120°C to 130°C and kept warm.

[0024] To achieve the above object, according to a third aspect of the present invention, a method for preparing the aforementioned high-bearing capacity seismic isolation bearing is provided, which is characterized in that:

[0025] Step A: Assembly before elastomer casting:

[0026] Applying adhesive to the pre-treated inner connecting steel plate and the stiffening steel plate, and then using an assembly mold sprayed with a release agent in advance, positioning and assembling the elastic gasket with the positioning holes processed therein, the inner connecting steel plate and the stiffening steel plate into a whole, and then preheating;

[0027] Step B, pouring modified polyurethane elastomer:

[0028] The modified polyurethane elastomer required is prepared according to the aforementioned method for preparing the modified polyurethane elastomer for the high-bearing-capacity seismic isolation bearing; the prepared modified polyurethane elastomer is poured into the gaps between the inner connecting steel plate, the stiffening steel plate, and the elastic washer, into the positioning holes of the three, and into the gap between the assembly mold to fill the mold cavity;

[0029] Step C, vulcanization operation:

[0030] After pouring is completed, it is vulcanized once on the vulcanization platform, and then demoulded and subjected to secondary vulcanization;

[0031] Step D, cooling and trimming:

[0032] After natural cooling, trimming and finishing;

[0033] Step E: Assemble the finished product:

[0034] Finally, the pre-treated outer connecting steel plate and the inner connecting steel plate are connected to assemble the finished product.

[0035] Preferably, the method further comprises the following steps:

[0036] According to the preparation method of the modified polyurethane elastomer of the high-load-bearing-capacity seismic isolation support as described above, the required modified polyurethane elastomer is prepared, and the configured modified polyurethane elastomer is poured into the gasket mold, and the elastic gasket (4) is formed after curing.

[0037] Preferably, the method further includes the following steps:

[0038] The outer connecting steel plates, inner connecting steel plates and stiffening steel plates are machined and leveled after cutting, and then sandblasted and cleaned; wherein the outer connecting steel plates also need to be sprayed with paint for corrosion protection and dried.

[0039] Preferably, in step A, preheating to 85°C to 100°C;

[0040] Preferably, in step B, pouring and filling the mold cavity is completed within 6 to 8 minutes.

[0041] Preferably, in step C, the primary vulcanization heating temperature is 110° C. to 120° C., and the duration is 1 to 2 hours; the secondary vulcanization heating temperature is 110° C. to 120° C., and the duration is 4 to 5 hours.

[0042] The above preferred technical features can be combined with each other as long as they do not conflict with each other.

[0043] In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art:

[0044] 1. The seismic isolation bearing of the present invention can effectively achieve shock absorption and high bearing capacity for structures such as bridges, and has the advantages of appropriate damping, strong displacement control ability, easy self-recovery, outstanding durability, and convenient construction.

[0045] 2. The seismic isolation bearing of the present invention has sufficient vertical stiffness to bear vertical loads and a high damping ratio to dissipate energy; it can reliably transmit the pressure of the upper structure to the pier; in addition, it has good elasticity to adapt to the rotation of the beam end and has a large shear deformation to meet the horizontal displacement of the upper structure.

[0046] 3. By specifying the elastomer material composition and mass percentage, specific process sequence, and conditions within the high-capacity isolation bearing, extensive testing and practical experience have demonstrated that the high-capacity isolation system possesses a significant vertical bearing capacity. When subjected to a surface pressure of 30 MPa, the vertical deformation is less than 1 mm. When the ultimate surface pressure exceeds 210 MPa, the vertical deformation is less than 10 mm, and the vertical bearing capacity is three times that of traditional rubber isolation bearings. The horizontal ultimate shear performance exceeds 300%, and the equivalent damping ratio reaches 15%. The high-capacity isolation device converts most of the seismic energy into the kinetic energy of the superstructure and the thermal energy of the isolation device, effectively reducing the seismic response displacement of the superstructure. The seismic displacement response is reduced by more than 20% compared to traditional isolation bearings, reducing the required displacement of the expansion joint and lowering the cost of the expansion joint. Furthermore, due to its miniaturization, the high-capacity isolation bearing is smaller and easier to install and construct, while maintaining the same vertical bearing capacity.

[0047] 4. The high-capacity seismic isolation bearings of the present invention possess a high vertical load-bearing capacity and can be used as vertical bearing devices for new bridges and renovations of existing bridges in all regions. Furthermore, the high-capacity seismic isolation bearings also possess horizontal seismic isolation properties, making them suitable for seismic isolation devices for all types of new bridges in seismic intensity zones. They can also be used for seismic isolation and vibration reduction reinforcement of existing bridges in seismic intensity zones. They can replace existing non-isolation steel bearings without changing the original bearing arrangement height, thereby improving the seismic safety of older bridges. These bearings are suitable for temperatures ranging from -20°C to +60°C, exhibit excellent corrosion and aging resistance, and can be used in coastal areas. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 This is a schematic diagram of the structure of a common rubber bearing in the prior art;

[0049] Figure 2 It is a structural diagram of a lead rubber bearing in the prior art;

[0050] Figure 3 It is a structural diagram of a high damping rubber bearing in the prior art;

[0051] Figure 4 It is a structural schematic diagram of the high-bearing capacity seismic isolation bearing of the present invention;

[0052] Figure 5 yes Figure 4 Schematic top view of

[0053] Figure 6 This is a schematic diagram of the assembly structure of the high-bearing capacity seismic isolation support of the present invention before the elastic body is cast;

[0054] Figure 7 It is a schematic diagram of the process flow of the present invention;

[0055] Figure 8It is a horizontal ultimate shear performance test curve diagram of the high-bearing capacity seismic isolation bearing of the present invention. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other. The present invention is further described in detail below with reference to specific embodiments.

[0057] like Figure 4-6 As shown, a high-load-bearing capacity seismic isolation bearing of the present invention includes an external connecting steel plate and a bearing body, and the bearing body includes an internal connecting steel plate 1, a stiffening steel plate 2, and an elastic body 3. The external connecting steel plate is composed of two layers, upper and lower, facing each other, and is connected to supporting structures such as the bottom of a bridge beam and the top of a pier by a plurality of sleeve bolts. In the bearing body, an elastic body 3 and a stiffening steel plate 2 are overlapped between the two internal connecting steel plates 1, and the internal connecting steel plates 1 are fixedly connected to the corresponding external connecting steel plates at the connecting holes 7 by connecting bolts and other connecting parts.

[0058] It also includes an elastic washer 4, which is disposed between the stiffening steel plates 2 and between the stiffening steel plates 2 and the inner connecting steel plates 1. The inner connecting steel plates 1, stiffening steel plates 2, and elastic washers 4 are each provided with positioning holes 5 for positioning and mounting the three. The gaps between the inner connecting steel plates 1, stiffening steel plates 2, and elastic washers 4 are filled with the elastomer 3, and the positioning holes 5 of the three are also filled with the elastomer 3. The elastomer 3 is a polyurethane elastomer. Preferably, the elastic washer 4 and the elastomer 3 are made of the same material.

[0059] For the overall seismic isolation bearing, the high-bearing capacity bearing has a circular cross-section shape with a diameter range of 320mm to 970mm and a height range of 91mm to 303mm. Preferably, a keyway 6 is provided in the middle of the inner connecting steel plate 1, and a shear key is provided in the keyway 6 between the inner connecting steel plate and the outer connecting steel plate. This is to drive the bearing to produce relative displacement in the horizontal direction and provide the bearing with the ability to resist horizontal loads accordingly. In addition, each sealing plate and the outer connecting steel plate connected to it can also form an integrated structure, which is not easy to burn the edge during the production vulcanization process, and is convenient for the production, assembly and maintenance of the bearing.

[0060] The seismic isolation bearing of the present invention can effectively achieve shock absorption and high bearing capacity for structures such as bridges, and has the advantages of appropriate damping, strong displacement control ability, easy self-recovery, outstanding durability, and convenient construction.

[0061] The seismic isolation bearing of the present invention has sufficient vertical stiffness to bear vertical loads and a high damping ratio to dissipate energy; it can reliably transmit the pressure of the upper structure to the pier; in addition, it has good elasticity to adapt to the rotation of the beam end and has large shear deformation to meet the horizontal displacement of the upper structure.

[0062] Taking into account the shortcomings of various seismic isolation bearings in the prior art, such as insufficient bearing capacity, complex construction, and unchanged replacement, the manufacturing process of the high-bearing-capacity seismic isolation bearing provided in the present invention is as follows.

[0063] See Figure 7 The preparation method of the modified polyurethane elastomer of the high-bearing capacity seismic isolation bearing of the present invention is as follows.

[0064] Step S1, preparation of material A:

[0065] First, preheat the TDI prepolymer, that is, use an oven to heat the original packaging barrel to 80-85℃, preferably 80℃, and mature it for about 6 hours. Use a pouring machine to start a vacuum pump to draw the prepolymer from the suction hose of tank A into tank A. After the material is added, vacuum it for 30-35 minutes, preferably 30 minutes, while stirring. Turn off material A and stir. Observe the light sight glass. There are basically no bubbles in the tank. Then pump it quietly for 10-15 minutes, preferably 10 minutes.

[0066] The TDI prepolymer used has representative properties as follows: NCO content of 6.33%, viscosity of 350 mPa.s at 80°C, and appearance as a pale yellow, transparent, viscous liquid at 80°C. The cured TDI prepolymer has the following properties: hardness of 95 Shore A, 100% tensile modulus of 12 MPa, elongation of 350%, and impact strength of 42%.

[0067] Step S2, preparation of material B:

[0068] At the same time, heat the MOCA solid particles to 105°C until they are melted, and use a vacuum pump on the pouring machine to draw the material into tank B from the suction hose of tank B. After the material is added, vacuum is drawn while stirring, and the temperature is raised to 120°C to 130°C for insulation, preferably 120°C.

[0069] The performance indicators of MOCA are selected as follows: Step S3, mixing and preparing: moisture ≤ 0.3%, OCA content ≤ 0.1%, MOCA content 86%.

[0070] The TDI prepolymer prepared in step S1-2 is mixed with MOCA in a weight ratio of 100:10-25.

[0071] See Figure 6 The preparation method of the high-bearing-capacity seismic isolation bearing as mentioned above is as follows.

[0072] Steel plate pretreatment:

[0073] The outer connecting steel plate, the inner connecting steel plate 1 and the reinforcing steel plate 2 are machined and leveled after cutting, and are sandblasted to a surface sandblasting grade of Sa2.5; wherein the outer connecting steel plate also needs to be sprayed with paint for corrosion protection and dried.

[0074] Polyurethane gasket pre-preparation:

[0075] According to the preparation method of the modified polyurethane elastomer of the high-load-bearing-capacity seismic isolation bearing as described above, the required modified polyurethane elastomer is prepared, and the configured modified polyurethane elastomer is poured into the gasket mold, and the elastic gasket 4 is formed after curing.

[0076] Assembly before elastomer casting:

[0077] Adhesive is applied to the pre-treated inner connecting steel plate 1 and the stiffening steel plate 2, and then an assembly mold sprayed with a release agent in advance is used to position and assemble the elastic gasket 4 with the positioning hole 5 and the inner connecting steel plate 1 and the stiffening steel plate 2 into a whole, and then preheated to 85°C to 100°C, preferably 85°C.

[0078] Adhesive process requirements are as follows: A 90° peel test shows that when used alone, Chemlok 213 has a dry film thickness of 19.05-31.75 μm and an average metal peel strength greater than 17 N / mm. When used with Chemlok 219 as a primer (12.7 μm) and a topcoat of 20 μm, the average metal peel strength is greater than 25 N / mm.

[0079] Casting modified polyurethane elastomer:

[0080] According to the preparation method of modified polyurethane elastomer for high-load-bearing seismic isolation bearings as described above, the required modified polyurethane elastomer is prepared; in the gap between the internal connecting steel plate 1, the stiffening steel plate 2, and the elastic gasket 4, in the positioning holes 5 of the three, and in the gap with the assembly mold, the modified polyurethane elastomer is poured along the mold wall within 6 to 8 minutes, preferably within 6 minutes, to fill the mold cavity.

[0081] Vulcanization operation:

[0082] After pouring is completed, it is vulcanized on a vulcanization platform at a heating temperature of 110°C to 120°C, preferably 110°C, for 1 to 2 hours, preferably 1 hour; after demoulding, it is vulcanized again at a secondary temperature of 110°C to 120°C, preferably 110°C, for 4 to 5 hours, preferably 4 hours.

[0083] Cooling and trimming:

[0084] After natural cooling, trimming is carried out.

[0085] Assembled finished product:

[0086] Finally, the pre-treated outer connecting steel plate is connected to the inner connecting steel plate 1 to assemble the finished product.

[0087] The installation process requirements for finished bearings are as follows.

[0088] The pier support stone should have a pre-reserved hole for the sleeve. The diameter and depth of the hole should be 50mm to 60mm larger than the diameter and length of the sleeve or screw. Mark the design centerline of the bearing on the pier support stone according to the design drawing. The bearing should be hoisted integrally, and the sleeve and bolts should be installed. Align the longitudinal and transverse design center positions, inserting the sleeve into the pre-reserved hole in the stone. Use four steel wedges to adjust the bearing to the design elevation. Pour the pre-reserved sleeve hole and the support base plate cushion with epoxy mortar or non-shrinkage mortar. After the mortar hardens, remove the four steel wedges and fill the gap with mortar. Ensure the mortar is poured densely. After the bolts are installed, apply a coat of epoxy zinc-rich primer and touch up any paint-chipped areas on the bearing. Cast the bearing top plate as part of the cast-in-place beam formwork. To prevent mortar leakage, fill the gaps between the top plate and the formwork with gauze or cork boards. This should be removed later when the formwork is removed.

[0089] The high bearing capacity seismic isolation bearing of the present invention was subjected to horizontal load under vertical compressive stress of 35MPa and horizontal ultimate shear performance test. The main shear performance is shown in FIG. Figure 8 As shown in the figure, during the test, the bearing remained intact even when its horizontal displacement reached 125mm (>300% shear strain), meeting the rubber bearing specification requirement that the ultimate shear deformation of the bearing be no less than 300% of the total rubber thickness. This demonstrates that the ultimate shear resistance of the high-capacity seismic isolation bearing of the present invention meets the requirements.

[0090] The high-load-bearing capacity seismic isolation bearing of the present invention has the following advantages.

[0091] High vertical bearing capacity and minimal deformation. The high-capacity isolation system boasts a high vertical bearing capacity, with a surface pressure of 30 MPa and a vertical deformation of less than 1 mm. It also boasts an ultimate surface pressure greater than 210 MPa and a vertical deformation of less than 10 mm. Its vertical bearing capacity is three times that of traditional rubber isolation bearings. Its horizontal ultimate shear performance exceeds 300%, and its equivalent damping ratio reaches 15%.

[0092] Small seismic displacement response and high cost-effectiveness. The high-capacity seismic isolation device converts most of the seismic energy into kinetic energy of the superstructure and thermal energy of the isolation device, effectively reducing the seismic response displacement of the superstructure. The seismic displacement response is reduced by more than 20% compared to traditional seismic isolation bearings, reducing the required displacement of the expansion joint and lowering the cost of the expansion joint.

[0093] Convenient construction and replacement. The product is miniaturized, and under the same vertical bearing capacity, the high-bearing-capacity seismic isolation bearing is smaller in size and easy to install and construct.

[0094] The material has high transparency and visible structure; it has good durability; it is also resistant to ozone and aging, and has little temperature dependence.

[0095] The high-load-bearing capacity seismic isolation bearing of the present invention has a wide range of applications. The high-load-bearing capacity seismic isolation bearing has a high vertical load-bearing capacity and can be used as a vertical load-bearing device for new bridges and renovation of old bridges in all regions; at the same time, the high-load-bearing capacity seismic isolation bearing also has horizontal seismic isolation performance, and can be used as a seismic isolation device for various new bridges in seismic intensity areas, and can also be used for seismic isolation, shock absorption and reinforcement of old bridges in seismic intensity areas. The original non-seismic isolation steel bearing can be replaced without changing the original bearing arrangement height, thereby improving the seismic safety of the old bridge. This type of bearing can be used in a temperature range of -20℃ to +60℃, has good corrosion resistance and aging resistance, and can be used in coastal areas, etc.

[0096] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for preparing a high-bearing capacity seismic isolation bearing. The high-bearing capacity seismic isolation support comprises an outer connecting steel plate, an inner connecting steel plate (1), a stiffening steel plate (2), and an elastic body (3); the elastic body (3) and the stiffening steel plate (2) are overlapped between two inner connecting steel plates (1); and the two inner connecting steel plates (1) are respectively fixedly connected to the corresponding outer connecting steel plates; It also includes an elastic gasket (4), preparing the required modified polyurethane elastomer, pouring the configured modified polyurethane elastomer into a gasket mold, and forming the elastic gasket (4) after curing; The elastic washers (4) are arranged between the stiffening steel plates (2) and between the stiffening steel plates (2) and the inner connecting steel plates (1); The inner connecting steel plate (1), the stiffening steel plate (2), and the elastic washer (4) are all provided with positioning holes (5) for positioning and installing the three. The elastomer (3) is a modified polyurethane elastomer, and the elastic washer (4) and the elastomer (3) are made of the same material; The method for preparing the high-bearing capacity seismic isolation bearing comprises: Step A, assembly before elastomer casting; Step B, pouring modified polyurethane elastomer; Step C, vulcanization operation: After pouring is completed, it is vulcanized on the vulcanization platform, and then vulcanized again after demoulding; Step D, cooling and trimming: After natural cooling, trimming is performed; Step E, assembling the finished product; Its characteristics are: The assembly of the elastic body (3) before casting in step A is as follows: applying adhesive to the pre-treated inner connecting steel plate (1) and the stiffening steel plate (2), and then using an assembly mold sprayed with a release agent in advance, positioning and assembling the elastic gasket (4) with the positioning hole (5) and the inner connecting steel plate (1) and the stiffening steel plate (2) into a whole, and then preheating to 85°C to 100°C; In step B, the modified polyurethane elastomer is poured along the mold wall to fill the mold cavity in the gaps between the inner connecting steel plate (1), the stiffening steel plate (2), and the elastic washer (4), in the positioning holes (5) of the three, and in the gap with the assembly mold.

2. The method for preparing a high-load-bearing-capacity seismic isolation bearing according to claim 1, characterized in that: A keyway is provided in the middle of the inner connecting steel plate, and a shear key between the inner connecting steel plate and the outer connecting steel plate is provided in the keyway.

3. The method for preparing a high-load-bearing-capacity seismic isolation bearing according to claim 1, characterized in that: The preparation method of the modified polyurethane elastomer, Step S1, preparation of material A: first preheat the TDI prepolymer, draw the prepolymer into tank A, after the material is added, stir and evacuate at the same time, turn off the stirring of material A, observe the light sight glass, and if there are no bubbles in the tank, continue to pump quietly; Step S2, preparation of material B: heat the MOCA solid particles until they are melted, and draw the material into tank B. After the material is added, vacuum is drawn while stirring, and the temperature is raised and kept warm; Step S3, mixing: the TDI prepolymer prepared in step S1-2 is mixed with MOCA in a weight ratio of 100:10-25.

4. The method for preparing a high-load-bearing-capacity seismic isolation bearing according to claim 3, characterized in that: In step S1, the preheating temperature is 80-85°C; vacuuming is performed for 30-35 minutes, and static pumping is performed for 10-15 minutes; In step S2, the temperature is raised to 120°C to 130°C and kept warm.

5. The method for preparing a high-bearing capacity seismic isolation bearing according to claim 1, wherein: The method further comprises a polyurethane gasket pre-preparation step: pouring the configured modified polyurethane elastomer into a gasket mold, and forming the elastic gasket after curing.

6. The method for preparing a high-load-bearing-capacity seismic isolation bearing according to claim 1, wherein: The method also includes a steel plate pretreatment step: the external connecting steel plates, internal connecting steel plates and stiffening steel plates are machined and leveled after cutting, and sandblasted; wherein the external connecting steel plates also need to be painted for corrosion protection and dried.

7. The method for preparing a high-bearing capacity seismic isolation bearing according to claim 1, wherein: In step A, preheat to 85°C~100°C; In step B, pouring and filling the mold cavity is completed within 6 to 8 minutes.

8. The method for preparing a high-load-bearing-capacity seismic isolation bearing according to claim 1, wherein: In step C, the primary vulcanization heating temperature is 110°C to 120°C, and the duration is 1 to 2 hours; the secondary vulcanization heating temperature is 110°C to 120°C, and the duration is 4 to 5 hours.

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