Elastic friction composite support and restraint system suitable for long-span bridge

Abstract

The utility model relates to the technical field of supports, aims to solve the problem of overlarge expansion and contraction amount of a beam end of a long-span bridge in the prior art, and provides an elastic friction composite support and a restraint system suitable for the long-span bridge. The support comprises an upper support plate, a spherical crown lining plate, a middle steel plate and a lower support plate which are sequentially arranged from top to bottom. A large-friction-coefficient sliding plate is arranged between the upper support plate and the spherical crown lining plate; elastic devices are respectively arranged on two sides of the middle steel plate; the two sides of the middle steel plate are matched with the elastic devices, and when the lower support plate moves longitudinally, the middle steel plate extrudes the elastic devices; the friction force between the upper support plate and the large-friction-coefficient sliding plate is larger than the elastic limit of the elastic device, the elastic device is used for adapting to small displacement caused by daily temperature changes of the beam body, and a friction pair is formed between the upper support plate and the large-friction-coefficient sliding plate and used for working when the displacement of the beam body exceeds the displacement range of the elastic device. The device adapts to large displacement and limit displacement of the beam body.

Description

TECHNICAL FIELD

[0001] The utility model relates to support technical field, specifically, it relates to a kind of elastic friction composite support and restraint system suitable for large-span bridge. BACKGROUND

[0002] With the rapid economic development, bridge construction has ushered in the opportunity of vigorous development, more and more large-span bridges are built in succession. The large expansion of the beam end of large-span bridge will affect the driving safety and the normal operation of the system, and in the approach bridge construction of the bridge, the large expansion of the beam end of large-span bridge will inevitably lead to the large design displacement of beam end expansion joint, support and damping device, increasing the construction cost in the early stage. At the same time, more displacement brings more wear and tear, and increases the maintenance cost in the later stage. SUMMARY

[0003] The utility model aims at providing a kind of elastic friction composite support and restraint system suitable for large-span bridge to solve the problem of large expansion of the beam end of large-span bridge in prior art.

[0004] The utility model is implemented by the following technical solutions:

[0005] The utility model provides a kind of elastic friction composite support suitable for large-span bridge, including upper support plate, spherical crown lining plate, intermediate steel plate, lower support plate arranged in sequence from top to bottom;

[0006] Large friction coefficient sliding plate is arranged between the upper support plate and the spherical crown lining plate, and the upper support plate can slide longitudinally relative to the spherical crown lining plate;

[0007] Elastic device is arranged on both sides of the intermediate steel plate respectively, and both ends of the elastic device are connected to both ends of the lower support plate longitudinally, and the elastic extension direction of the elastic device is along the bridge direction;

[0008] The two sides of the intermediate steel plate cooperate with the elastic device, and when the lower support plate longitudinally displaces, the intermediate steel plate will extrude the elastic device;

[0009] The friction between the upper support plate and the large friction coefficient sliding plate is greater than the elastic limit of the elastic device, the elastic device is used to adapt to small displacement caused by daily temperature change of beam body, and the friction pair is formed between the upper support plate and the large friction coefficient sliding plate, which is used to work when the displacement of beam body exceeds the displacement range of the elastic device, and adapt to large displacement and limit displacement of beam body.

[0010] Among them, large displacement includes annual temperature displacement, earthquake displacement, etc.

[0011] The elastic friction composite support combines the characteristics of the friction damping type support and the elastic constraint support, combines elastic displacement and friction displacement, and can well adapt to the needs of various bridge constraint systems.

[0012] With the above structure, in the small displacement stage of the beam body, first, the elastic device below adapts to the small displacement caused by the daily temperature change of the beam body; when the displacement continues to increase and exceeds the displacement range of the elastic device, the upper friction pair adapts to the large displacement; when the displacement of the beam body decreases to the displacement range of the elastic device, the elastic deformation of the elastic device is switched to adapt to the small displacement of the beam body; when the displacement of the beam body continues to decrease to the displacement range outside the elastic device, the upper friction pair adapts to the displacement of the beam body, and the elastic device can adapt to the displacement of the beam body within a certain range, which is determined according to the elastic limit of the elastic device.

[0013] For the support of the utility model, the small displacement caused by the daily temperature change is adapted by the elastic displacement, and the large displacement or limit displacement such as annual temperature displacement and earthquake displacement is adapted by the friction displacement, which not only avoids the frequent friction between the upper support plate and the large-friction-coefficient sliding plate, thereby reducing the accumulated displacement amount of the friction surface, prolonging the service life of the friction surface and improving the service life of the support, but also has reliable constraint reaction force and self-resetting capability, which is beneficial to the reset of the support, provides greater elastic stiffness, more economically realizes the large-stiffness elastic displacement of the support, and makes the structure of the support more optimal.

[0014] The segmented action of the elastic device and the large friction surface not only provides reliable constraint reaction force and self-resetting capability, realizes the displacement constraint of the beam end, and compared with the support only designed with elastic displacement, the utility model sets the large-friction-coefficient sliding plate between the upper support plate and the spherical crown lining plate, adds the friction displacement, and provides the large displacement constraint force of the support through the friction force, so that the designed elastic displacement of the support can be greatly reduced, the size of the elastic device can be effectively reduced by reducing the elastic displacement, and then the size of the support and the installation space requirement of the support are reduced, so that the structure size of the support is more optimal.

[0015] The utility model has the advantages of simple structure, low design and manufacturing difficulty, and economical cost.

[0016] As a preferred technical scheme:

[0017] The friction coefficient of the large-friction-coefficient sliding plate is between 0.05 and 0.25.

[0018] As a preferred technical scheme:

[0019] The friction coefficient of the large-friction-coefficient sliding plate is not limited to the above range, and can be selected according to the design longitudinal limiting force.

[0020] As a preferred technical solution:

[0021] The large friction coefficient sliding plate is a flat plate structure.

[0022] As a preferred technical solution:

[0023] The large friction coefficient sliding plate adopts ultra-high performance polytetrafluoroethylene sliding plate or polyimide sliding plate.

[0024] The large friction coefficient sliding plate adopts ultra-high performance polytetrafluoroethylene or polyimide as friction material, which can provide stable friction coefficient and higher wear life.

[0025] As a preferred technical solution:

[0026] The large friction coefficient sliding plate is not limited to using ultra-high performance polytetrafluoroethylene, polyimide and other high molecular materials as friction material.

[0027] As a preferred technical solution:

[0028] The large friction coefficient sliding plate is installed on the top surface of the spherical crown lining plate, and the upper support plate is in sliding connection with the large friction coefficient sliding plate.

[0029] As a preferred technical solution:

[0030] The two ends of the elastic device are respectively connected to the stop blocks at the longitudinal two ends of the lower support plate.

[0031] As a preferred technical solution:

[0032] The elastic device includes force transmission half shafts respectively connected to the stop blocks at the longitudinal two ends of the lower support plate, a first elastic expansion piece is arranged between the two force transmission half shafts, and the two ends of the first elastic expansion piece are respectively in abutment with the end portions of the two force transmission half shafts; a guide sleeve is sleeved outside the first elastic expansion piece, the guide sleeve is in sliding connection with the force transmission half shaft, a second elastic expansion piece is sleeved outside the force transmission half shaft, one end of the second elastic expansion piece is in abutment with the end portion of the guide sleeve, and the other end of the second elastic expansion piece is in abutment with the intermediate steel plate.

[0033] As a preferred technical solution:

[0034] The first elastic expansion piece adopts a disc spring, and the second elastic expansion piece adopts a spiral spring;

[0035] The guide sleeve includes two semi-circular structure guide sleeve units, the two guide sleeve units are detachably connected, and the two guide sleeve units form a cylindrical structure after being connected.

[0036] The disc spring is used for providing support elastic rigidity, and the coil spring is used for ensuring that the guide sleeve is always in the middle of the disc spring and ensuring the guiding function of the disc spring.

[0037] With the above structure, the guide sleeve can be conveniently disassembled, and the damaged disc spring can be individually replaced without disassembling the entire elastic device.

[0038] As a preferred technical solution:

[0039] The elastic telescopic member is not limited to a spring, and other members with elastic telescopic deformation capability can also be used.

[0040] As a preferred technical solution:

[0041] The two guide sleeve units are connected through bolts and pins.

[0042] As a preferred technical solution:

[0043] The spherical cap lining plate is rotationally connected with the intermediate steel plate.

[0044] As a preferred technical solution:

[0045] A spherical surface sliding plate is arranged between the spherical cap lining plate and the intermediate steel plate.

[0046] As a preferred technical solution:

[0047] The intermediate steel plate is slidingly connected with the lower support plate, and the lower support plate can longitudinally slide relative to the intermediate steel plate.

[0048] As a preferred technical solution:

[0049] A sliding plate, a mirror surface stainless steel plate and a guide rail assembly are arranged between the intermediate steel plate and the lower support plate.

[0050] As a preferred technical solution:

[0051] Two groups of resisting portions are respectively formed on the transverse sides of the intermediate steel plate, one end of the force transmission half shaft passes through a groove on the resisting portion and is connected with the lower support plate, and the other end of the second elastic telescopic member abuts against the resisting portion.

[0052] The utility model further provides a kind of elastic friction composite restraint system suitable for large-span bridge, including the elastic friction composite support suitable for large-span bridge described above, and elastic friction composite support is installed at bridge tower.

[0053] As described above, since the above technical solution is adopted, the utility model has the beneficial effects that:

[0054] 1. The elastic friction composite support of the utility model combines the characteristics of friction damping type support and elastic restraint support, combines elastic displacement and friction displacement, and can well adapt to the needs of various bridge restraint systems.

[0055] 2. The utility model discloses a segmented action through big friction surface and elastic device, adapts to small displacement caused by daily temperature change through elastic displacement, adapts to annual temperature displacement, earthquake displacement and other large displacement or limit displacement through friction displacement, avoids frequent friction of upper support plate and big friction coefficient sliding plate, thereby reduces the accumulated displacement amount of the friction surface, improves the service life of the friction surface, and improves the service life of the support.

[0056] 3. The elastic device of the utility model has reliable restraint reaction force and self-resetting capacity, is favorable for support resetting, makes the structure of the support more optimal, and the utility model discloses a big friction coefficient sliding plate is arranged between the upper support plate and the spherical crown lining plate, provides the large displacement restraint force of the support through friction force, solves the problem that the expansion and contraction amount of the beam end of the large-span bridge is too large, realizes the beam end displacement restraint function with the smallest volume and the most economical cost, and ensures that the displacement amount of the beam end is within the working range of the track temperature regulator.

[0057] 5. Compared with the support only designed with elastic displacement, the utility model discloses a big friction coefficient sliding plate is arranged between the upper support plate and the spherical crown lining plate, friction displacement is added, the designed elastic displacement of the support can be greatly reduced, the size of the elastic device can be effectively reduced by reducing the elastic displacement, and then the size of the support and the installation space requirement of the support are reduced.

[0058] 6. The support of the utility model adopts the elastic device, provides greater elastic stiffness, more economically realizes the large stiffness elastic displacement of the support, and improves the self-resetting capacity of the support.

[0059] 7. The utility model discloses a big friction coefficient sliding plate to realize limit displacement, can change the limit displacement that the big friction coefficient sliding plate can realize by selecting different big friction coefficient sliding plates, can adapt to the large displacement demand of the beam end by making the friction surface long, the structure of the utility model is simple, the design and manufacturing difficulty is low, and the cost is economical.

[0060] 8. The elastic friction composite restraint system of the utility model sets up elastic composite friction support at the main tower, the support can provide longitudinal elasticity, friction and longitudinal damping in addition to the basic bearing, corner and displacement functions of the support, the combination of elasticity and friction can effectively reduce the expansion and contraction amount of the beam end, and the friction damping can also longitudinally suppress the vibration of the beam body.

[0061] The system can improve the constraint capacity of the support to the beam body, better control the displacement of the beam end and adapt to the constraint displacement requirement of a larger span bridge, especially can effectively save the installation space of the beam bottom support system and reduce the cost of the support system under the working condition that the displacement of the beam end is large, the system provides larger elastic stiffness due to the elastic device of the support, improves the longitudinal constraint stiffness and longitudinal centering capacity of the system, the small displacement caused by daily temperature change is realized by the elastic displacement of the support, and only the annual large displacement and the displacement under special working conditions are realized by the friction surface of the support, so that the service life of the friction surface can be effectively guaranteed, and the service life of the support is guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0062] Figure 1 A left view of the elastic friction composite support suitable for a large-span bridge.

[0063] Figure 2 A front view of the elastic friction composite support suitable for a large-span bridge.

[0064] Figure 3 A top view of the elastic friction composite support suitable for a large-span bridge.

[0065] Figure 4 A structure schematic view of the intermediate steel plate described in embodiment 1.

[0066] Figure 5 A structure schematic view of the elastic device described in embodiment 1.

[0067] Figure legend: 1-upper support plate, 2-spherical cap lining plate, 3-large friction coefficient sliding plate, 4-intermediate steel plate, 401-resisting part, 5-lower support plate, 6-elastic device, 601-force transmission half shaft, 602-disc spring, 603-guide sleeve, 604-spiral spring, 605-bolt, 606-pivot. DETAILED DESCRIPTION

[0068] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be described clearly and completely in conjunction with the drawings, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0069] Embodiment 1

[0070] As Figures 1-5As shown, the embodiment proposes an elastic friction composite support suitable for large-span bridges, which comprises an upper support plate 1, a spherical cap lining plate 2, an intermediate steel plate 4, and a lower support plate 5 arranged in sequence from top to bottom, wherein the top surface of the spherical cap lining plate 2 is provided with a large-friction-coefficient sliding plate 3, the upper support plate 1 is in sliding connection with the large-friction-coefficient sliding plate 3, and the upper support plate 1 can longitudinally slide relative to the spherical cap lining plate 2. The longitudinal direction refers to the bridge direction.

[0071] The spherical cap lining plate 2 is in rotational connection with the intermediate steel plate 4, the intermediate steel plate 4 is in sliding connection with the lower support plate 5, and the lower support plate 5 can longitudinally slide relative to the intermediate steel plate 4.

[0072] The intermediate steel plate 4 is provided with elastic devices 6 on both sides in the transverse direction, and the two ends of the elastic devices 6 are connected to the two ends of the lower support plate 5 in the longitudinal direction. The elastic extension direction of the elastic devices 6 is along the bridge direction, and the elastic devices 6 can realize longitudinal extension deformation.

[0073] The two sides of the intermediate steel plate 4 cooperate with the elastic devices 6, when the intermediate steel plate 4 longitudinally displaces, the intermediate steel plate 4 will extrude the elastic devices 6 to adapt to the small displacement amount of the bridge caused by daily temperature changes. At the same time, the elastic devices 6 will generate an elastic restraint force opposite to the moving direction of the intermediate steel plate 4, which can constrain and limit the movement of the intermediate steel plate 4 on one hand, and help the support reset on the other hand.

[0074] In the embodiment, the elastic devices 6 are placed on the intermediate steel plate 4, and the two ends thereof are connected to the stop blocks at the two ends of the lower support plate 5 in the longitudinal direction, the intermediate steel plate 4 and the stop blocks at the two ends of the lower support plate 5 in the longitudinal direction have a gap, and the lower support plate 5 can slide relative to the intermediate steel plate 4 within a certain range in the longitudinal direction.

[0075] The elastic device 6 comprises two force transmission half shafts 601 connected to the end blocks at the longitudinal two ends of the lower support plate 5 respectively, a disc spring 602 is arranged between the two force transmission half shafts 601, and the two ends of the disc spring 602 are in abutment with the end portions of the two force transmission half shafts 601 respectively; an outer portion of the disc spring 602 is sleeved with a guide sleeve 603, the guide sleeve 603 is in sliding connection with the force transmission half shaft 601, an outer portion of the force transmission half shaft 601 is sleeved with a coil spring 604, one end of the coil spring 604 is in abutment with an end portion of the guide sleeve 603, and the other end of the coil spring 604 is in abutment with the intermediate steel plate 4; the disc spring 602 is used for providing support elastic rigidity, and the coil spring 604 is used for ensuring that the guide sleeve 603 is always in the middle position of the disc spring 602, so as to guarantee the guiding function of the disc spring 602; two groups of resisting portions 401 are formed at the transverse two sides of the intermediate steel plate 4 respectively, one end of the force transmission half shaft 601 passes through a groove on the resisting portion 401 and is connected with the lower support plate 5, and the other end of the coil spring 604 is in abutment with the resisting portion 401; the elastic force of the disc spring 602 can be adjusted by changing the material and size of the disc spring 602, so as to adapt to the corresponding small displacement.

[0076] In the embodiment, the guide sleeve 603 comprises two guide sleeve units in semicircular structure, the two guide sleeve units are detachably connected, and the two guide sleeve units form a cylindrical structure after being connected. The two guide sleeve units are connected through a bolt 605 and a pin shaft 606. By adopting the above structure, the guide sleeve 603 can be conveniently disassembled, and the damaged disc spring 602 can be replaced individually without removing the entire elastic device 6.

[0077] The structure of the elastic device 6 and the intermediate steel plate 4 is not limited to the structure provided in the embodiment, and other structures capable of realizing support elastic displacement can also be used.

[0078] In the embodiment, a spherical surface sliding plate can be arranged between the spherical cap lining plate 2 and the intermediate steel plate 4, so as to realize rotation, and a sliding plate, a mirror surface stainless steel plate and a guide rail assembly can be arranged between the intermediate steel plate 4 and the lower support plate 5, so as to realize relative sliding.

[0079] The elastic friction composite support of the utility model combines the characteristics of the friction damping type support and the elastic constraint support, combines elastic displacement and friction displacement, and can well adapt to the needs of various bridge constraint systems.

[0080] The upper structure of the support is provided with a large friction coefficient sliding plate 3 between the upper support plate 1 and the spherical cap lining plate 2, and a friction pair is formed between the upper support plate 1 and the large friction coefficient sliding plate 3; the lower structure of the support is provided with an elastic device 6 between the middle steel plate 4 and the lower support plate 5, when the beam body has a small displacement, the lower elastic device 6 is adapted to the small displacement; when the displacement of the beam body continues to increase and exceeds the displacement range of the elastic device 6, the upper friction pair is adapted to the large displacement; when the displacement of the beam body decreases to the displacement range of the elastic device 6, the elastic deformation of the elastic device 6 is adapted to the small displacement of the beam body; when the displacement of the beam body continues to decrease and is out of the displacement range of the elastic device 6, the upper friction pair is adapted to the displacement of the beam body; the elastic device 6 can adapt to the displacement of the beam body within a certain range, and the range is determined according to the elastic limit of the elastic device 6.

[0081] Since the accumulated displacement of the support is usually a small displacement in daily life, the large friction surface and the elastic device 6 are used for segmented action, the elastic device 6 is used to adapt to the small displacement of the beam body in daily life, the upper support plate 1 and the large friction coefficient sliding plate 3 are prevented from frequent friction, the accumulated displacement of the friction surface is reduced, the service life of the friction surface is prolonged, and the service life of the support is prolonged; moreover, the elastic device 6 has reliable constraint reaction force and self-resetting capacity, is favorable for resetting of the support, and makes the structure of the support more optimal.

[0082] Therefore, for the support of the utility model, the small displacement caused by temperature change in daily life is adapted by elastic displacement, and only the large displacement or the limit displacement such as annual temperature displacement and earthquake displacement is adapted by friction displacement. The displacement of the beam body is preferentially adapted by elastic displacement, the support can maximize the elastic displacement, the displacement of the friction pair and the accumulated displacement of the whole support can be effectively reduced, and the wear life of the support is greatly improved.

[0083] Compared with the support only designed with elastic displacement, the upper structure of the support of the utility model is provided with the large friction coefficient sliding plate 3 between the upper support plate 1 and the spherical cap lining plate 2, the friction displacement is added, the large displacement constraint force of the support is provided by the friction force, the design elastic displacement of the support can be greatly reduced, the spring size is effectively reduced by reducing the elastic displacement, and then the size of the support and the installation space requirement of the support are reduced; since the elastic device 6 is used in the support, greater elastic stiffness is provided, the large stiffness elastic displacement of the support is more economically realized, the self-resetting capacity of the support is improved; the structure of the utility model is simple, the difficulty of design and manufacture is low, and the cost is economic.

[0084] Since the friction force is converted by the dead weight of the beam body, the material with stable friction coefficient can be selected as the large friction coefficient sliding plate 3, so as to ensure that the conversion of the friction force is stable, economical and reliable. For example, the large friction coefficient sliding plate 3 can be made of high molecular material such as ultra-high performance polytetrafluoroethylene and polyimide as the friction material, so as to provide stable friction coefficient and high wear life. According to the design of the longitudinal limiting force, the friction coefficient of the large friction coefficient sliding plate 3 is selected, and in the embodiment, the friction coefficient of the large friction coefficient sliding plate 3 is between 0.05 and 0.25.

[0085] The utility model discloses a large friction coefficient sliding plate 3 realizes limit displacement, and the limit displacement that can be realized by the large friction coefficient sliding plate 3 can be changed by selecting different large friction coefficient sliding plate 3. The friction surface is made long, and the large displacement demand of the beam end can be adapted, and the design and manufacture difficulty is low, and the support cost is low.

[0086] The utility model discloses an elastic friction composite support, solve the problem that the large -span bridge beam end expansion quantity is too big, with the smallest volume, the cost of the most economy realizes the beam end displacement restraint function.

[0087] Embodiment 2

[0088] The embodiment provides an elastic friction composite restraint system suitable for a large-span bridge, which comprises the elastic friction composite support in embodiment 1.

[0089] The elastic friction composite restraint system suitable for the large-span bridge can be applied to a semi-floating system, a tower beam fixed system and a long-link continuous beam system, the elastic friction composite support and a transverse wind-resistant support are arranged at a bridge tower, and a common spherical support can be arranged at a beam end.

[0090] Since the support at the bridge tower usually bears a large vertical bearing capacity, the vertical force can be fully utilized to be converted into a longitudinal friction restraint force. Moreover, the main tower usually has large horizontal stiffness and can bear a large longitudinal horizontal force.

[0091] The system is characterized in that the elastic composite friction support is arranged at the main tower, the support can provide longitudinal elasticity, friction and longitudinal damping in addition to basic bearing, turning angle and displacement functions, the combination of elasticity and friction can effectively reduce the expansion and contraction of the beam end, and the friction damping can also longitudinally suppress the vibration of the beam body.

[0092] In the small displacement stage, the elastic displacement of the support lower part is given priority to sliding because the friction force of the support upper part is greater than the force provided by the lower spring, the spring elasticity provides the system with a gradually changing longitudinal force, when the displacement of the support continues to increase and exceeds the elastic displacement range, the large friction displacement of the support upper part is switched, the friction force of the friction surface provides the system with a constant constraint elastic force, the longitudinal position limiting ensures the displacement of the beam body, once the displacement of the bridge decreases, the elastic displacement is switched, when the displacement continues to decrease and is out of the elastic displacement range, the large friction pair displacement is switched again. The elastic friction composite support reduces the longitudinal expansion displacement of the beam body caused by temperature and live load.

[0093] The system can improve the constraint capacity of the support to the beam body, better control the displacement of the beam end and adapt to the constraint displacement demand of the larger span bridge, especially can effectively save the installation space of the beam bottom support system and reduce the cost of the support system under the working condition of larger displacement of the beam end.

[0094] For the system, the small displacement caused by the daily temperature change is realized by the elastic displacement of the support, the large displacement of the annual and the displacement under the special working condition are realized by the friction surface of the support, the service life of the friction surface can be effectively guaranteed, and the service life of the support is guaranteed.

[0095] The above only describes the preferred embodiments of the present application and is not used to limit the present application, for those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An elastic friction composite support suitable for large-span bridges, characterized in that: it comprises, from top to bottom, an upper support plate, a spherical cap lining plate, a middle steel plate, and a lower support plate; a large-friction-coefficient sliding plate is arranged between the upper support plate and the spherical cap lining plate, and the upper support plate can slide longitudinally relative to the spherical cap lining plate; elastic devices are arranged on both sides of the middle steel plate, and both ends of each elastic device are connected to the ends of the lower support plate in the longitudinal direction, and the elastic devices are elastically stretched in the bridge-following direction; the two sides of the middle steel plate are matched with the elastic devices, and when the lower support plate is longitudinally displaced, the middle steel plate will press the elastic devices; the friction between the upper support plate and the large-friction-coefficient sliding plate is greater than the elastic limit of the elastic devices, the elastic devices are used to adapt to small displacements caused by daily temperature changes of the beam body, and a friction pair is formed between the upper support plate and the large-friction-coefficient sliding plate, which is used to work when the displacement of the beam body exceeds the displacement range of the elastic devices, and adapt to large displacements and limit displacements of the beam body.

2. The elastic friction composite support suitable for large-span bridges according to claim 1, characterized in that: the friction coefficient of the large-friction-coefficient sliding plate is between 0.05 and 0.

25.

3. The elastic friction composite support suitable for large-span bridges according to claim 1, characterized in that: the large-friction-coefficient sliding plate is a flat plate structure.

4. The elastic friction composite support suitable for large-span bridges according to claim 1, characterized in that: the large-friction-coefficient sliding plate is an ultra-high-performance polytetrafluoroethylene sliding plate or a polyimide sliding plate.

5. The elastic friction composite support suitable for large-span bridges according to claim 1, characterized in that: the large-friction-coefficient sliding plate is installed on the top surface of the spherical cap lining plate, and the upper support plate is in sliding connection with the large-friction-coefficient sliding plate.

6. The elastic friction composite support suitable for large-span bridges according to claim 1, characterized in that: both ends of the elastic device are connected to the stop blocks at the ends of the lower support plate in the longitudinal direction.

7. The elastic friction composite support suitable for large-span bridges according to claim 6, characterized in that: the elastic device comprises force transmission half shafts connected to the stop blocks at the ends of the lower support plate in the longitudinal direction, a first elastic expansion piece is arranged between the two force transmission half shafts, and both ends of the first elastic expansion piece are in abutment with the ends of the two force transmission half shafts; an outer portion of the first elastic expansion piece is sleeved with a guide sleeve, the guide sleeve is in sliding connection with the force transmission half shafts, an outer portion of the force transmission half shafts is sleeved with a second elastic expansion piece, one end of the second elastic expansion piece is in abutment with the end of the guide sleeve, and the other end of the second elastic expansion piece is in abutment with the middle steel plate.

8. The elastic friction composite support suitable for large-span bridges according to claim 7, characterized in that: the first elastic expansion piece is a disc spring, and the second elastic expansion piece is a spiral spring. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ The guide sleeve comprises two semi-circular guide sleeve units, which are detachably connected.

9. The elastic friction composite support suitable for long-span bridges according to claim 7, characterized in that: Two groups of resisting portions are formed on the lateral sides of the intermediate steel plate, one end of the force transmission half shaft is connected with the lower support plate through the slot on the resisting portion, and the other end of the second elastic expansion piece abuts against the resisting portion.

10. An elastic friction composite restraint system suitable for long-span bridges, characterized in that: The elastic friction composite support suitable for long-span bridges according to any one of claims 1-9 is installed at the bridge tower.

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