Blocking type anti-aging rubber support body as well as preparation method and application thereof

Abstract

The invention belongs to manufacturing of bridge supports, and particularly relates to a blocking type anti-aging rubber support body as well as a preparation method and application thereof. The blocking type anti-aging rubber support body comprises stiffening steel plates which are horizontally arranged and longitudinally distributed in a rubber layer at intervals. An anti-aging ring is longitudinally distributed and annularly arranged in the rubber layer on the outer side of the edge of the stiffening steel plate, the anti-aging ring comprises a bag cavity used for containing an anti-aging material and the anti-aging material arranged in the bag cavity, and the bag cavity is made of a flexible material which can be vulcanized with the rubber layer into a whole. The rubber support can effectively solve the problem of rubber support degradation in the prior art, and has the advantages that cracks on the surface of the support can be effectively prevented from extending inwards, the degradation process of the rubber support body is delayed or prevented, and manufacturing and construction are simple and easy to implement.

Description

Technical Field

[0001] The invention relates to the manufacture of bridge bearings, and in particular to a blocking type anti-aging rubber bearing body and a preparation method and application thereof. Background Art

[0002] Rubber bearings are important structural components of bridge superstructures. They play important roles in carrying loads, transferring displacements, and ensuring appropriate rotation angles. To ensure that rubber bearings function normally during the life of the bridge, in addition to meeting the basic physical and mechanical performance indicators specified in the standards, rubber bearings should also have excellent aging resistance.

[0003] The deterioration of plate rubber bearings in normal use is mainly manifested in cracks on the surface of the rubber protective layer, rust on the steel plate, debonding and crushing between the internal layers of the bearing. Cracks on the surface of the rubber protective layer are mainly caused by surface tensile strain and aging of the rubber surface; rust on the steel plate and debonding between the internal layers are caused by cracks on the surface of the bearing penetrating the rubber protective layer, and the inner steel plate is exposed to the air and rusted; crushing is caused by serious debonding, bending fracture, and serious rust on the steel plate inside the bearing. The occurrence of crushing indicates that the steel plate has lost its stiffening effect and the bearing has lost its use function. The replacement of plate rubber bearings requires a lot of manpower and material resources, and sometimes even requires blocking traffic, which will not only cause a lot of waste of resources, but also bring inconvenience to people's travel. Crushing deterioration is a long process, and the speed of crack development depends on the formula of the rubber material and the strain level of the rubber surface. Experimental studies have shown that the internal factors that cause rubber aging include: structural weaknesses of polymer materials themselves, such as chemical composition, molecular chain structure and physical structure, etc.; the effects of additives such as antioxidants, plasticizers, cross-linking agents and organic solvents on materials. The external factors that cause rubber aging mainly include the effects of oxygen and ozone and the level of strain on the rubber surface.

[0004] At present, the commonly used method includes adding a protective cover to the outer surface of the bearing. The outer protective cover of the bearing is generally made of a single material with additives to meet its main function. However, in actual use, the bearing is often faced with working conditions under the coupling of multiple factors, and may face multiple influencing factors, such as acid and alkaline environment, aging, marine atmospheric erosion, and bumps during construction. Over time, cracks are prone to form on the surface, which may cause the bearing to rust, causing the overall performance of the bearing to decay or lose the bearing function. This makes the existing bridge bearing outer protective cover often have poor mechanical properties and low aging resistance. At the same time, it is easy to produce internal cracks during service, and the cracks are easy to intensify and expand, resulting in a short service life of the bridge bearing outer protective cover.

[0005] The applicant has not found any literature reports that are identical or similar to the present application after searching. Summary of the invention

[0006] The purpose of the present invention is to provide a blocking type aging-resistant rubber bearing body, a preparation method and application thereof. By setting an anti-aging ring in the rubber layer outside the edge of the stiffening steel plate, the cracks on the bearing surface are effectively prevented from extending inward, thereby greatly reducing the probability of bearing replacement caused by steel plate corrosion and internal interlayer debonding.

[0007] The overall technical concept of the present invention is:

[0008] The blocking type anti-aging rubber bearing body includes a stiffening steel plate horizontally arranged and longitudinally spaced in the rubber layer; an anti-aging ring is longitudinally distributed and arranged in a ring shape in the rubber layer outside the edge of the stiffening steel plate, and the anti-aging ring includes a cavity for accommodating the anti-aging material, and the anti-aging material is placed in the cavity. The cavity is made of a flexible material that can be vulcanized into one with the rubber layer.

[0009] The method for preparing the blocking type anti-aging rubber bearing body comprises the following steps:

[0010] A. Fold the flexible material that can be vulcanized with the rubber layer into a laminated structure of corresponding height according to the height of the rubber bearing body, and set an isolation layer between the inner walls of adjacent laminated structures to prevent them from sticking;

[0011] B. Using cold bonding and / or hot bonding to bond the outer edges of the laminated structure to form a capsule cavity that is annular as a whole and closed inside;

[0012] C. Open a hole on one side of the cyst cavity and install a filling port;

[0013] D. Place the support lower protective layer film or lower steel plate and the side protective layer film in the mold, make a hole in the side protective layer film and align it with the reserved hole in the mold;

[0014] E. Place the capsule cavity with the filling port in step C into the mold so that the filling port is inserted into the reserved hole of the mold;

[0015] F. Place the inner rubber layer, the stiffening steel plate, the upper protective layer film or the upper steel plate into the mold in sequence, cover the mold with the upper cover, and then vulcanize under high temperature and pressure;

[0016] G. After vulcanization is completed, demould and inspect;

[0017] H. After passing the inspection, use a pressure pump to inject the aging-resistant material into the bag cavity through the filling port. After the aging-resistant material is solidified or the filling port is sealed, a blocking type aging-resistant rubber bearing body is made.

[0018] Application of blocking type aging-resistant rubber bearing body in plate rubber bearing.

[0019] Application of blocking type aging-resistant rubber bearing body in PTFE slide plate type rubber bearing.

[0020] Application of blocking type aging-resistant rubber bearing body in seismic isolation rubber bearing.

[0021] The specific technical concept of the present invention also includes:

[0022] The aging-resistant material is preferably a material with stable properties and easy to be placed in the cyst cavity by pressurized perfusion. It can be cured or not after pressurized perfusion in the cyst cavity, and can be prevented from leaking by closing the filling port. The preferred technical implementation method is that the aging-resistant material is selected from one of liquid silicone, polyurethane, liquid silicone rubber, and acrylic liquid rubber. Among them, liquid silicone rubber is a special synthetic rubber with excellent high temperature resistance, chemical corrosion resistance and aging resistance. Liquid silicone rubber is widely used in aerospace, automotive and electronics industries for the manufacture of seals, coatings and insulating materials. Acrylic liquid rubber is a liquid rubber based on acrylic polymers. Acrylic liquid rubber has good weather resistance, chemical corrosion resistance and bonding properties. It is usually used to manufacture coatings, adhesives and sealing materials. Liquid silicone is a high-performance elastic material with excellent high and low temperature resistance, electrical insulation, biocompatibility, aging resistance and weather resistance, and easy processing. Polyurethane is a synthetic material with excellent aging resistance, elasticity, recovery and wear resistance.

[0023] The bladder cavity is made of a flexible material that can be vulcanized with the rubber layer as one. The preferred technical implementation means is that the bladder cavity is made of rubber-hanging curtain fabric and / or rubber.

[0024] The capsule cavity is provided with a filling port which is connected to the outside and is used for injecting anti-aging material. In order to facilitate the connection between the filling port and the capsule cavity while satisfying the structural strength of the filling port, the filling port is preferably made of metal.

[0025] In order to avoid adhesion of the inner wall of the cyst cavity, the preferred technical implementation means is to provide an isolation layer between the inner surfaces of adjacent cyst cavities to prevent adhesion.

[0026] The isolation layer is made of a material that does not chemically react or adhere to the material of the capsule cavity at a temperature not exceeding 200°C. The preferred technical implementation means include but are not limited to ordinary paper, isolation paper, plastic cloth, etc., all of which do not deviate from the essence of the present invention.

[0027] The substantial features and significant technical advances of the present invention are:

[0028] 1. The present invention provides an anti-aging ring in the rubber layer outside the edge of the stiffening steel plate, which can effectively prevent the cracks on the bearing surface from extending inward, delay or prevent the deterioration process of the rubber bearing body, and greatly reduce the probability of bearing replacement caused by steel plate corrosion and internal interlayer debonding.

[0029] 2. The aging-resistant material is set in the aging-resistant circle made of rubber, lining cloth and other materials. The applicant's experiments have confirmed that, firstly, since the tensile performance of the aging-resistant material is higher than that of rubber, it can always play a blocking effect when the bearing is subjected to shear force, isolating the bearing body from the external environment, effectively slowing down or isolating the damage to the bearing body caused by adverse conditions such as high temperature, ozone or water vapor in the natural environment, delaying the aging rate of the bearing body, thereby greatly improving the service life of the rubber bearing; secondly, the ozone resistance of the aging-resistant material is much higher than that of the rubber bearing material. When the rubber layer of the bearing is cracked by ozone, it can effectively protect the internal rubber and block the degradation process of the rubber bearing body.

[0030] 3. The anti-aging ring and the support body are formed in one step by vulcanization. The preparation method is simple and easy. The liquid anti-aging material can be conveniently placed in the anti-aging ring by pressurized pouring. The construction is simple and easy. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings of the present invention include:

[0032] Figure 1 It is a structural schematic diagram of the blocking type anti-aging rubber bearing body in the present invention.

[0033] Figure 2 It is a structural schematic diagram of a blocking type anti-aging rubber bearing body applied to a polytetrafluoroethylene slide plate type rubber bearing.

[0034] Figure 3 It is a structural schematic diagram of the blocking type anti-aging rubber bearing body in the present invention applied to the seismic isolation rubber bearing.

[0035] Figure 4 It is a schematic diagram of the product structure obtained in step A of the present invention.

[0036] Figure 5 It is a schematic diagram of the product structure obtained in step B of the present invention.

[0037] Figure 6 It is a schematic diagram of the product structure obtained in step C of the present invention.

[0038] Figure 7 It is a schematic diagram of the product structure obtained in step F of the present invention.

[0039] Figure 8 It is a schematic diagram of the product structure obtained in step H of the present invention.

[0040] Fig. 9 yes Figure 8 A partial enlarged view of Part I.

[0041] The reference numerals in the accompanying drawings are as follows:

[0042] 1. Anti-aging ring; 1A. Cavity; 1B. Anti-aging material; 1C. Isolation layer; 1D. Filling port; 2. Rubber layer; 3. Reinforcing steel plate; 4. Lower sealing steel plate; 5. Lower steel plate of support; 6. Lower embedded steel plate; 7. Bolts; 8. Upper sealing steel plate; 9. Upper steel plate of support; 10. Upper embedded steel plate; 11. Anchor assembly; 12. Polytetrafluoroethylene plate; 13. Mold; 13A. Mold reserved hole. DETAILED DESCRIPTION

[0043] The accompanying drawings show embodiments of the present invention. The embodiments of the present invention are further described below in conjunction with the accompanying drawings, but should not be construed as limiting the present invention. The protection scope of the present invention shall be based on the contents recorded in the claims. Any replacement of equivalent technical means made according to the specification shall not depart from the protection scope of the present invention.

[0044] Example 1

[0045] The overall structure of this embodiment is as follows Figure 1 , 4 As shown in Figures 1 to 9, the blocking type anti-aging rubber bearing body includes a stiffening steel plate 3 which is horizontally arranged and longitudinally spaced in the rubber layer 2; an anti-aging ring 1 is longitudinally distributed and arranged in a ring shape in the rubber layer 2 outside the edge of the stiffening steel plate 3, and the anti-aging ring 1 includes a cavity 1A for accommodating the anti-aging material 1B, and the anti-aging material 1B is placed in the cavity 1A, and the cavity 1A is made of rubber curtain fabric.

[0046] The method for preparing the blocking type anti-aging rubber bearing body comprises the following steps:

[0047] A. Fold the rubber curtain fabric into a laminated structure of corresponding height according to the height of the rubber support body, and set an isolation layer 1C between the inner walls of adjacent laminated structures to prevent them from sticking together. The isolation layer 1C is made of isolation paper;

[0048] B. Using cold bonding and / or hot bonding to bond the outer edges of the laminated structure to form a capsule cavity 1A that is annular and closed inside;

[0049] C. Open a hole on one side of the capsule cavity 1A and install a filling port 1D, which is made of metal;

[0050] D. Place the support lower protective layer film or lower steel plate and the side protective layer film in the mold 13, make a hole in the side protective layer film and align it with the reserved hole 13A of the mold;

[0051] E. Place the capsule cavity 1A with the filling port 1D in step C into the mold 13, so that the filling port 1D is inserted into the reserved hole 13A of the mold;

[0052] F. Place the inner rubber layer, the stiffening steel plate 3, the upper protective layer film or the upper steel plate into the mold 13 in sequence, cover the mold 13 with a cover, and then vulcanize under high temperature and pressure;

[0053] G. After vulcanization is completed, demould and inspect;

[0054] H. After passing the inspection, a pressure pump is used to inject the anti-aging material 1B into the cavity 1A through the filling port 1D. After the anti-aging material 1B is solidified or the filling port 1D is blocked, a blocking type anti-aging rubber bearing body is made. The anti-aging material 1B is made of polyurethane.

[0055] The blocking type anti-aging rubber bearing body prepared in this embodiment can be used to prepare a plate-type rubber bearing, and its structure is as follows: Figure 1 .

[0056] Example 2

[0057] The overall structure of this embodiment is as follows Figure 2 As shown, a polytetrafluoroethylene plate 12 is provided on the upper surface of the blocking type anti-aging rubber bearing body formed in Example 1 to form a polytetrafluoroethylene slide plate type rubber bearing.

[0058] Example 3

[0059] The overall structure of this embodiment is as follows Figure 3 As shown, an upper sealing steel plate 8 and a lower sealing steel plate 4 are respectively arranged on the upper and lower surfaces of the blocking type anti-aging rubber bearing body. The upper sealing steel plate 8 and the lower sealing steel plate 4 are formed with the anti-aging rubber bearing body by one-time vulcanization. The upper sealing steel plate 8 is fixed to the upper steel plate 9 of the bearing by bolts 7, and the upper steel plate 9 of the bearing is connected and fixed to the upper embedded steel plate 10 by anchoring components 11; the lower sealing steel plate 4 is fixed to the lower steel plate 5 of the bearing by bolts 7, and the lower steel plate 5 of the bearing is fixed to the lower embedded steel plate 6 by bolts 7 to form a seismic isolation rubber bearing. When the bearing is subjected to horizontal load, its rubber layer and the internal stiffening steel plate 3 are protected by the upper sealing steel plate 8 and the lower sealing steel plate 4, so that the rubber layer can achieve a large overall lateral displacement without instability, and can better adapt to the expansion and contraction of the beam body. At the same time, the bearing is connected to the beam body and the pier by bolts, and the energy transmitted to the beam body during an earthquake is reduced, which can effectively keep the beam body and the pier from being damaged.

[0060] To verify the technical effect of the embodiment, the applicant conducted the following experiments:

[0061] 1. Ozone aging resistance test

[0062]

[0063] Experiments have shown that the ozone resistance of polyurethane aging-resistant materials is much higher than that of rubber bearing materials. When the rubber of the bearing protective layer is cracked by ozone, it can effectively protect the internal rubber, block its aging effect, and effectively delay the degradation process of the bearing body.

[0064] 2. Heat-resistant air aging test

[0065]

[0066] The test shows that the performance change rate of polyurethane aging-resistant materials after thermal aging is lower than that of rubber materials used in bearings, that is, the aging process of polyurethane aging-resistant materials is slower and its aging-resistant life is longer. It can effectively delay the aging phenomenon of the bearing from extending to the internal rubber.

Claims

1. A blocking type anti-aging rubber bearing body, comprising a stiffening steel plate (3) arranged horizontally and distributed longitudinally in a rubber layer (2); characterized in that An anti-aging ring (1) is longitudinally distributed and arranged along a ring in the rubber layer (2) outside the edge of the stiffening steel plate (3). The anti-aging ring (1) includes a cavity (1A) for accommodating an anti-aging material (1B), and the anti-aging material (1B) is placed in the cavity (1A). The cavity (1A) is made of a flexible material that can be vulcanized into one with the rubber layer (2).

2. The blocking type anti-aging rubber bearing body according to claim 1 is characterized in that The anti-aging material (1B) is selected from one of liquid silicone, polyurethane, liquid silicone rubber and acrylic liquid rubber.

3. The blocking type anti-aging rubber bearing body according to claim 1 is characterized in that The bladder cavity (1A) is made of rubber curtain fabric and / or rubber.

4. The blocking type anti-aging rubber bearing body according to claim 1 is characterized in that The capsule cavity (1A) is provided with a filling port (1D) which is communicated with the outside and is used for injecting the anti-aging material (1B).

5. The blocking type anti-aging rubber bearing body according to any one of claims 1 to 4, characterized in that An isolation layer (1C) is provided between the inner surfaces of adjacent sac cavities (1A) to prevent them from sticking together.

6. The method for preparing the blocking type anti-aging rubber bearing body according to any one of claims 1 to 5, characterized in that The steps include: A. Folding the flexible material that can be vulcanized with the rubber layer (2) into a laminated structure of corresponding height according to the height of the rubber support body, and providing an isolation layer (1C) between the inner walls of adjacent laminated structures to prevent them from sticking together; B. Using cold bonding and / or hot bonding to bond the outer edges of the laminated structure to form a capsule cavity (1A) that is annular and closed internally; C. Open a hole on one side of the bladder cavity (1A) and install a filling port (1D); D. Place the support lower protective layer film or lower steel plate and the side protective layer film in the mold (13), make a hole in the side protective layer film and align it with the reserved hole (13A) of the mold; E. Place the capsule cavity (1A) into the mold (13) and insert the filling port (1D) into the reserved hole (13A) of the mold; F. Place the inner rubber layer, the stiffening steel plate (3), the upper protective layer rubber sheet or the upper steel plate into the mold (13) in sequence, cover the mold (13) with a cover, and then vulcanize under high temperature and pressure; G. After vulcanization is completed, demould and inspect; H. After passing the inspection, a pressure pump is used to inject the anti-aging material (1B) into the cavity (1A) through the filling port (1D). After the anti-aging material (1B) is solidified or the filling port (1D) is blocked, a blocking type anti-aging rubber bearing body is manufactured.

7. The method for preparing the blocking type anti-aging rubber bearing body according to claim 6, characterized in that The isolation layer is made of a material that does not chemically react with and does not adhere to the material of the capsule cavity (1A) under a temperature not exceeding 200°C.

8. Application of the blocking type anti-aging rubber bearing body according to any one of claims 1 to 5 in a plate-type rubber bearing.

9. Application of the blocking type anti-aging rubber bearing body according to any one of claims 1 to 5 in a polyfluoro slide plate type rubber bearing.

10. Use of the blocking type anti-aging rubber bearing body according to any one of claims 1 to 5 in a seismic isolation rubber bearing.

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