CN211036700U - Spatial large-corner durable sling connecting structure of suspension bridge - Google Patents

Abstract

The utility model relates to a big corner in suspension bridge space, durable type hoist cable connection structure, the stretch-draw is between cable clip and beam-ends from top to bottom in the hoist cable, including the cable body, the last lower terminal of cable body corresponds the anchor in last anchor cup, in the anchor cup down, goes up the anchor cup at its top, the anchor cup is provided with the hoist cable otic placode of taking the pinhole respectively in its bottom down, the hoist cable otic placode on hoist cable top and the cable clip otic placode of taking the pinhole rotate through the round pin axle and be connected, the hoist cable otic placode of hoist cable bottom and the beam-ends otic placode of taking the pinhole rotate through the round pin axle and be connected, the round pin axle is provided with joint bearing with the pinhole cooperation department of otic placode, this otic placode includes the hoist cable otic placode. When the steel box girder of the sling moves downwards along the bridge direction and the transverse bridge direction under load, the joint bearing can meet the requirements of rotary swing and inclined swing, even the combined swing of the rotary swing and the inclined swing, thereby avoiding the sling from bending, eliminating the bending stress acting on the sling, improving the degree of freedom of deflection of the sling and reducing the bending fatigue of the sling.

Description

Spatial large-corner durable sling connecting structure of suspension bridge

Technical Field

The utility model relates to a suspension bridge hoist cable upper and lower anchor head respectively with the connection structure of cable clip, girder steel, especially relate to a connection structure that can realize that the hoist cable deflects in two directions in space.

Background

The sling is used as a force transmission component of the suspension bridge, has a fine structure, and bears the live load action of vehicles, wind and the like in the using process, so the sling is the most easy to cause fatigue damage in the suspension bridge component. In an actual bridge, the safety factor of the sling is considered more abundantly during design, and the static strength is not easy to damage. However, since the external environment of the suspension cable is relatively severe, corrosion fatigue is likely to occur due to the coupling effect of the fatigue stress caused by the corrosion of the corrosive medium and live load. In addition, the steel box girder is easy to swing along the longitudinal direction and the transverse direction of the bridge under the action of dynamic load, so that the sling bears repeated bending, and particularly, the short sling in the midspan is easy to cause fatigue failure. Mainly under the live load effect, the hoist cable bears the axial load that changes, and the steel wire internal force changes thereupon constantly, and this kind of reciprocal change will lead to inside steel wire to experience reciprocal drawing alternating stress, leads to the inside steel wire of hoist cable structure to take place fatigue failure easily.

In addition, due to alternating load action and the swinging of the steel box girder, a corner is generated at the joint of the anchor head under the sling and the main girder, if the anchor device is unreasonable in structure, the steel wire at the joint of the anchor head under the sling is subjected to reciprocating bending stress under long-term reciprocating action, so that the section stress of the steel wire generates bending combined stress circulation to generate steel wire fatigue. The service cycle of the suspension bridge sling is long, the suspension bridge sling is exposed in a natural environment for a long time, and bears the comprehensive effect of factors such as environmental erosion, external load, fatigue effect and the like, wherein the two factors of corrosion and fatigue can cause the durability and the bearing capacity of the sling to be greatly reduced.

Reducing the fatigue load of the sling and improving the durability of the sling is well appreciated by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the people carries out hoist cable pulling force and the two index fatigue damage mode research of corner and life-span aassessment through the analysis to hoist cable tensile bending stress and coupling effect, has developed one kind and can adapt to the big corner in space, has the hoist cable connection structure of tensile bending performance, alleviates the stretch bending fatigue of suspension bridge hoist cable especially short hoist cable, improves the life of suspension bridge hoist cable.

The utility model provides a technical scheme that above-mentioned problem adopted does: the utility model provides a big corner in suspension bridge space, durable type hoist cable connection structure, hoist cable stretch-draw from top to bottom between cable clamp and beam-ends, includes the cable body, the last lower extreme of cable body corresponds the anchor in last anchor cup, lower anchor cup, go up the anchor cup at its top the anchor cup is provided with the hoist cable otic placode of taking the pinhole respectively in its bottom down, and the hoist cable otic placode on hoist cable top is connected through the round pin axle rotation with the cable clamp otic placode of taking the pinhole, and the hoist cable otic placode of hoist cable bottom is connected through the round pin axle rotation with the beam-ends otic placode of taking the pinhole. The bottom end of the sling rope: a joint bearing is arranged at the matching position of the pin shaft and the pin hole of the lower ear plate, the lower ear plate is one of the sling ear plate at the bottom end and the beam end ear plate, and the joint bearing meets the requirement that the sling can deflect in a plane which is not vertical to the pin shaft; the top end of the sling: the pin shaft is provided with a bush at the matching position of the pin hole of the upper lug plate, the upper lug plate is one of the sling lug plate and the cable clamp lug plate at the top end, the bush is fixed on the inner wall of the pin hole, and the pin shaft is in clearance fit with the bush.

The cable body mainly comprises twisted parallel steel wire bundles, an inner polyethylene sheath and an outer polyethylene sheath, wherein the inner polyethylene sheath and the outer polyethylene sheath are wrapped outside the steel wire bundles. Generally, the inner layer sheath is a black polyethylene sheath, and the outer layer sheath is a color polyethylene sheath.

The steel wire bundle is formed by twisting a plurality of zinc-based alloy coating steel wires with the diameter of 5mm-7mm by 3 degrees to 4 degrees.

The knuckle bearing of this application includes bearing inner race and bearing inner race, and the bearing inner race has the ectosphere, and the bearing inner race has interior sphere, and the bearing inner race is fixed to be set up in the pinhole of lower otic placode, and the activity of bearing inner race sets up in the downthehole sphere of bearing inner race and interior, ectosphere constitute the sphere contact of activity, and the bearing inner race sets up the confession the pinhole that the round pin axle passed.

In order to adapt to the realization of large-angle deflection of the sling in space, the arc length of the outer spherical surface of the inner ring of the bearing is further designed to be obviously larger than that of the inner spherical surface of the outer ring of the bearing, and the central angle corresponding to half of the arc length difference of the inner spherical surface exceeding the outer spherical surface is the maximum rotation angle of the inner ring of the bearing relative to the deflection of the outer ring of the bearing.

In order to prolong the service life of the joint bearing, the abrasion resistance of the bearing inner ring and the bearing outer ring needs to be improved, and a polytetrafluoroethylene fiber fabric is further arranged on the contact surface of the outer spherical surface and the inner spherical surface to serve as a lubricating layer, so that the self-lubricating effect of the joint bearing is realized. And the polytetrafluoroethylene fiber fabric is preferably arranged on the inner spherical surface of the bearing outer ring, so that the lubricating layer is not exposed all the time when the outer spherical surface and the inner spherical surface rotate relatively.

The smoothness of the contact spherical surface is related to the service life of the knuckle bearing, once foreign matters invade into the contact spherical surface, the influence is caused, a sealing structure is arranged at the inner spherical surface or the outer spherical surface of the bearing outer ring or the bearing inner ring, and the sealing structure forms a seal for preventing the contact spherical surface from being invaded.

The sealing structure is arranged at the edges of two sides of the bearing outer ring, respectively forms sealing for the contact spherical surface for two sides of the bearing outer ring, and comprises a sealing groove and a special-shaped sealing ring, wherein the special-shaped sealing ring is arranged in the sealing groove, and the lip of the special-shaped sealing ring keeps the sealing effect of sliding contact with the outer spherical surface of the bearing inner ring.

Specifically, the seal groove forms an exposed gap along the axial direction of the bearing outer ring, the special-shaped seal ring is provided with a bevel edge lip overflowing out of the gap, the bevel edge lip is in interference fit with the bearing inner ring to achieve the effect of always attaching to the outer spherical surface, and the interference fit means that the size of the bevel edge lip slightly exceeds the design value and slightly deforms when contacting with the bearing inner ring to attach to the outer spherical surface. Furthermore, the bevel edge lip is provided with a contact tangent plane, and the contact tangent plane is attached to the outer spherical surface of the bearing inner ring, so that surface contact type sealing is realized.

In order to increase the elasticity of the sealing ring and improve the sealing effect, the bevel edge lip is provided with a groove or an inner hole so as to have elastic characteristics, so that the bevel edge lip elastically acts on the outer spherical surface to keep a movable close-fitting state so as to adapt to the dynamic sealing of the contact spherical surface changed in the rotation process of the sling.

In order to facilitate the installation of the sealing ring to be in place and the installation to be fixed, the special-shaped sealing ring is provided with a protruding positioning flange, the notch is provided with a step extending along the radial direction of the bearing outer ring, and the flange and the step are in conflict with each other in the radial direction of the bearing outer ring to realize the positioning.

Preferably, the bushing and the pin hole of the lug plate are in radial interference fit so that the bushing is clamped in the pin hole and does not move relatively. The bush includes annular backing, annular backing internal perisporium is provided with polytetrafluoroethylene fiber fabric lubricant film, wears round pin axle and lubricant film clearance fit in annular backing hole, has improved the activity degree of freedom, realizes the lubrication action, reduces the wearing and tearing of the two.

Preferably, the bushing is provided with a sealing structure which comprises a sealing groove arranged on the inner hole of the annular backing and an O-shaped sealing ring arranged in the sealing groove, and the O-shaped sealing ring acts on the pin shaft penetrating in the inner hole of the annular backing; the sealing structure is provided with two setting positions which are respectively positioned at two sides of the annular back lining and respectively form end sealing for two ends of the lubricating layer, so that the foreign matters are prevented from invading the lubricating layer to cause abrasion.

Compared with the prior art, the utility model has the advantages of: the connecting structure of suspension bridge sling of this application adopts the anchor cup tip at hoist cable upper and lower both ends to set up the sling otic placode of taking the pinhole, sets up the beam-ends otic placode on the steel case roof beam, sets up the cable clamp otic placode on the cable clamp, and the sling otic placode and the cable clamp otic placode at top, the sling otic placode and the beam-ends otic placode of bottom are connected through the round pin axle rotation respectively. And furthermore, a joint bearing of special design is arranged at the matching position of the pin shaft and the lug plate pin hole, so that the space corner of the sling is realized, when a steel box girder of the sling moves along the bridge direction and the transverse bridge direction under load, the joint bearing can meet the requirements of rotary swing and inclined swing, even the combined swing of the rotary swing and the inclined swing, so that the sling is prevented from being bent, the bending stress acting on the sling is eliminated, the deflection freedom degree of the sling is improved, and the pull bending fatigue of the sling is reduced.

The application carries out special design to joint bearing, belongs to a big corner self-lubricating joint bearing.

(1) By increasing the width of the bearing inner ring and the outer diameter of the bearing outer ring, the corner of the bearing is improved, and the large-corner deflection of the sling is realized.

(2) The wear resistance of the large-corner joint bearing is improved by using PTFE (polytetrafluoroethylene) fiber fabric as a lubricating layer. The lubricating layer of the common joint bearing is mostly made of coating materials (or PU copper mesh liners) such as molybdenum disulfide, Teflon and the like, and the lubricating layer is formed by coating the inner surface of the outer ring of the bearing (or sticking the liners) and then extruding the coating materials and the inner ring of the bearing in a sleeved mode. The self-lubricating oscillating bearing using the materials has poor wear resistance and large bearing clearance, and restricts the wear-resistant service life of components in some aspects. The joint bearing adopting PTFE (polytetrafluoroethylene) fiber fabric as a self-lubricating material can make up for the defects, and has the advantages of bearing strength, corrosion resistance, frictional wear and use. The PTFE (polytetrafluoroethylene) fiber fabric is a composite fabric prepared by spinning PTFE and glass fiber (or aramid fiber) and the like and performing impregnation treatment, and has the characteristics of high strength and small friction coefficient. The fiber fabric is applied to the sling large-corner self-lubricating knuckle bearing, so that the sling large-corner knuckle bearing not only keeps the characteristics of high bearing and automatic centering, but also has the characteristics of self-lubricating, impact resistance, long service life and the like.

(3) The special sealing structure is formed by the specially designed sealing groove and the special-shaped sealing ring, so that the movable contact spherical surface of the bearing outer ring and the bearing inner ring can be effectively sealed, and the influence on the service life of the bearing caused by the intrusion of foreign matters into the working surface of the bearing can be prevented.

(4) The self-lubricating bushing is arranged at the matching position of the cable clamp lug plate and the sling lug plate, so that the sling can freely deflect more flexibly relative to the cable clamp lug plate, the deflection resistance is reduced, and the durability is improved.

Drawings

FIG. 1 is a schematic view of a sling according to an embodiment of the present invention;

FIG. 2 is a side view of the structure shown in FIG. 1;

FIG. 3 is a schematic view of a cable body interface;

FIG. 4 shows a connecting structure of a sling ear plate and a cable clamp ear plate at a cable clamp end;

FIG. 5 is a connecting structure of the end ear plate of the end beam of the steel beam and the ear plate of the cable clamp;

FIG. 6 shows the movement of the suspension ropes and the connecting members under the condition that the steel beam moves along the bridge direction;

FIG. 7 shows the movement of the slings and connectors under the condition of lateral movement of the steel beam;

FIG. 8 is an enlarged view of portion A of FIG. 7;

fig. 9 is a front view of a spherical plain bearing according to an embodiment of the present invention;

FIG. 10 is a cross-sectional view AA in FIG. 9;

fig. 11 is a maximum angle of the knuckle bearing shown in fig. 10 deflected to one side.

FIG. 12 is a partial enlarged view of a fitting structure of a bearing inner race and a bearing outer race;

FIG. 13 is an enlarged view of portion A of FIG. 12;

FIG. 14 is a cross-sectional view of the contour seal ring;

FIG. 15 is a front view of the contour seal ring;

FIG. 16 is an axial cross-sectional view of the bushing;

FIG. 17 is an enlarged view of portion A of FIG. 16;

fig. 18 is an enlarged view of a portion B in fig. 16.

Detailed Description

The present invention will be described in further detail with reference to the following embodiments.

The suspension bridge sling connecting structure in the embodiment is characterized in that a sling is stretched up and down between a cable clamp and a beam end, and comprises a sling body 1, and the sling body is composed of twisted parallel steel wire bundles 101, and an inner polyethylene sheath 102 and an outer polyethylene sheath 103 which are wrapped outside the steel wire bundles 101. The steel wire bundle is formed by twisting 3-4 degrees and is selected from zinc-based alloy coated steel wires with the diameter of 5-7 mm. The upper end and the lower end of the cable body 1 are correspondingly anchored in the anchor cup 2, the top of the upper anchor cup and the bottom of the lower anchor cup are respectively provided with a sling ear plate 3 with a pin hole, and the sling ear plates 3 are double-lug ear plates. The sling ear plate 3 at the top end of the sling is rotatably connected with the cable clamp ear plate 4 with the pin hole through a pin shaft 5, and the sling ear plate 3 at the bottom end of the sling is rotatably connected with the beam end ear plate 6 with the pin hole through a pin shaft 5. The cable clamp ear plate 4 and the beam end ear plate 6 are single ear plates. And joint bearings 7 are respectively arranged at the pin holes of the pin shaft 5 and the beam end ear plate 6. The matching position of the pin shaft 5 and the cable clamp ear plate 4 is provided with a bush 12, the bush 12 is in clearance fit with the pin shaft 5, and the bush 12 is fixedly matched with the cable clamp ear plate 4.

Firstly, the joint bearing 7 is a durable large-corner self-lubricating joint bearing with a sealing structure.

When the steel box girder of the sling moves along the direction of the bridge and under the load of the transverse bridge, the self-lubricating joint bearing can meet the requirements of rotary swing and inclined swing, even the composite swing of the rotary swing and the inclined swing, thereby avoiding the sling from bending, eliminating the bending stress acting on the sling, and the movement modes of the sling and the connecting piece, which are shown in figures 6, 7 and 8.

The joint bearing comprises a bearing inner ring 701 and a bearing outer ring 702, wherein the bearing inner ring 701 is provided with an outer spherical surface, the bearing outer ring 702 is provided with an inner spherical surface, for example, a beam end lug plate 6 is taken as an example, the bearing outer ring 702 is fixedly arranged in a pin hole of the beam end lug plate 6, the bearing inner ring 701 is movably arranged in the ball hole of the bearing outer ring 702, the inner spherical surface and the outer spherical surface form movable spherical contact, and the bearing inner ring 01 is provided with a pin hole for a pin shaft 5 to pass through.

(1) By increasing the width of the bearing inner ring and the outer diameter of the bearing outer ring, the corner of the bearing is improved, and the large corner of the sling is realized. As shown in fig. 11, the arc length of the outer spherical surface of the inner race of the bearing is significantly greater than the arc length of the inner spherical surface of the outer race of the bearing, and the central angle corresponding to half of the difference between the arc lengths of the inner spherical surface and the outer spherical surface is the maximum rotation angle of the inner race of the bearing relative to the outer race of the bearing, and the larger the width of the inner race of the bearing is, the larger the deflection angle is.

(2) The wear resistance of the large-rotation-angle knuckle bearing is improved by arranging the PTFE (polytetrafluoroethylene) fiber fabric on the contact spherical surface of the inner ring and the outer ring of the bearing, the polytetrafluoroethylene fiber fabric 8 is used as a lubricating layer, the polytetrafluoroethylene fiber fabric 8 is preferentially arranged on the inner spherical surface of the fixed bearing outer ring 702, and the lubricating layer 8 is controlled not to be exposed all the time when the outer spherical surface and the inner spherical surface rotate relatively.

(3) The provision of the sealing structure for the contact spherical surface prevents foreign matter from intruding into the working surface of the bearing and affecting the life of the bearing. The sealing structure is arranged at the edges of two sides of the bearing outer ring 702 and comprises a sealing groove 10 and a special-shaped sealing ring 9, the special-shaped sealing ring 9 is arranged in the sealing groove 10, and the special-shaped sealing ring 9 has the positioning function with the bearing outer ring and the dynamic contact sealing function with the outer spherical surface of the bearing inner ring.

As shown in fig. 13, the sealing groove 10 forms an exposed gap along the axial direction of the bearing outer ring, the seal ring has a bevel edge lip which overflows from the gap, and the bevel edge lip has a contact tangent plane, and is attached to the outer spherical surface of the bearing inner ring 701 through the contact tangent plane. The bevel edge lip is in interference fit with the bearing inner ring to realize the outer spherical surface which is always attached to the bearing inner ring.

The interference magnitude of the outermost bevel edge lip is maximum, a groove is formed in the bevel edge lip, the elasticity of the sealing lip is mainly increased, and a certain interference magnitude is generated on the spherical surface of the bearing after the sealing ring is assembled, so that the sealing lip of the sealing ring is in contact with the outer spherical surface of the inner ring of the joint bearing, and sealing is realized.

The sealing structure adopts flange positioning, the special-shaped sealing ring is provided with a protruding positioning flange 901, a step 11 is formed by extending a notch of a sealing groove along the radial direction of the bearing outer ring, and the positioning flange 901 and the step 11 are in contact with each other in the radial direction of the bearing outer ring.

A special clamp is required to be adopted during the assembly of the sealing ring, and the assembly method comprises the following steps: the joint bearing is horizontally placed on a special clamp → a sealing ring is placed → the sealing ring is firstly pressed into a groove position of a sealing groove from one position → the sealing ring is pressed in slowly along one direction after being pressed in → two ends are butted, a special tool is adopted for pressing in the protruding position → whether the sealing ring is installed in place is checked → the inner ring of the rotating bearing observes the laminating degree of the sealing ring and the inner sleeve spherical surface, and the installation is finished when no gap is left in the whole laminating.

(4) The inner ring and the outer ring of the joint bearing are made of high-hardness and high-wear-resistance stainless steel 40Cr13 or similar materials, so that the corrosion resistance service life and the wear resistance service life of the joint bearing are guaranteed.

Secondly, the bush 12 is used for enabling the pin 5 and the cable clamp ear plate 4 to rotate freely relative to each other, and the durability of the structure is improved. The bushing 12 comprises a steel base backing 1201, a polytetrafluoroethylene fiber fabric is arranged in an inner hole of the steel base backing 1201 to serve as a lubricating layer 1202, and a sealing structure for preventing foreign matters from entering the lubricating layer is arranged in the inner hole of the steel base backing 1201.

1) The steel base-PTFE (polytetrafluoroethylene) fiber fabric lining can bear high load of 250MPa under the condition of oil-free lubrication, the working temperature range is-200-280 ℃, and the steel base-PTFE (polytetrafluoroethylene) fiber fabric lining can bear vibration impact load in a vacuum environment or a radiation area.

2) The bush and the cable clamp or the inner hole of the steel beam ear plate adopt interference fit, and the pin shaft and the bush adopt clearance fit. After assembly, a certain interference magnitude exists between the cable clamp or the steel beam lug plate hole and the bushing, and relative movement does not exist between the cable clamp or the steel beam lug plate hole and the bushing. The pin shaft and the bush can rotate relatively, and the abrasion-resistant service life of the bearing can be prolonged.

3) The surface finish of the pin shaft needs to be more than Ra1.6, and the surface finish of the steel base backing 1201 can reach more than Ra1.6. If the surface of the shaft or steel-based backing 1201 sleeve is too rough, the wear between the two can be significant and ultimately lead to a significant reduction in the useful life of the shaft and sleeve.

4) The bushing is provided with a sealing structure, the sealing structure comprises a sealing groove in an inner hole of a steel base backing 1201 and an O-shaped polyurethane sealing ring 1203, and the pin shaft is held tightly through the O-shaped polyurethane sealing ring 1203. The seal structure has two locations, on either side of the steel-based backing 1201, to provide a two-end seal to the lubricant layer.

In addition to the above embodiments, the present invention also includes other embodiments, and all technical solutions formed by equivalent transformation or equivalent replacement should fall within the protection scope of the claims of the present invention.

Claims (16)

1. A suspension bridge space large corner durable suspension cable connection structure, wherein a suspension cable is stretched between a cable clamp and a beam end from top to bottom, the suspension cable connection structure comprises a cable body, the upper end and the lower end of the cable body are anchored in an upper anchor cup and a lower anchor cup correspondingly, the top of the upper anchor cup and the bottom of the lower anchor cup are respectively provided with a suspension cable lug plate with a pin hole, the suspension cable lug plate at the top end of the suspension cable is rotationally connected with the cable clamp lug plate with the pin hole through a pin shaft, the suspension cable lug plate at the bottom end of the suspension cable is rotationally connected with the beam end lug plate with the pin hole through a pin shaft,

the bottom end of the sling rope: a joint bearing is arranged at the matching position of the pin shaft and the pin hole of the lower ear plate, the lower ear plate is one of the sling ear plate at the bottom end and the beam end ear plate, and the joint bearing meets the requirement that the sling can deflect in a plane which is not vertical to the pin shaft; the top end of the sling: the pin shaft is provided with a bush at the matching position of the pin hole of the upper lug plate, the upper lug plate is one of the sling lug plate and the cable clamp lug plate at the top end, the bush is fixed on the inner wall of the pin hole, and the pin shaft is in clearance fit with the bush.

2. The spatial large-corner durable sling connecting structure for a suspension bridge as defined in claim 1, wherein: the cable body mainly comprises twisted parallel steel wire bundles, an inner polyethylene sheath and an outer polyethylene sheath, wherein the inner polyethylene sheath and the outer polyethylene sheath are wrapped outside the steel wire bundles.

3. The spatial large-corner durable sling connecting structure for a suspension bridge as claimed in claim 2, wherein: the steel wire bundle is selected from zinc-based alloy coated steel wires with the diameter of 5mm-7 mm.

4. The spatial large-corner durable sling connecting structure for a suspension bridge as defined in claim 1, wherein: the knuckle bearing comprises a bearing inner ring and a bearing outer ring, the bearing inner ring is provided with an outer spherical surface, the bearing outer ring is provided with an inner spherical surface, the bearing outer ring is fixedly arranged in a pin hole of the lower lug plate, the bearing inner ring is movably arranged in the ball hole of the bearing outer ring, the inner spherical surface and the outer spherical surface form movable spherical contact, and the bearing inner ring is provided with a pin hole for the pin shaft to pass through.

5. The spatial large-corner durable sling connection structure for a suspension bridge as defined in claim 4, wherein: the arc length of the outer spherical surface of the bearing inner ring is obviously longer than that of the inner spherical surface of the bearing outer ring, and the central angle corresponding to half of the arc length difference of the inner spherical surface exceeding the outer spherical surface is the maximum rotation angle of the bearing inner ring deflected relative to the bearing outer ring.

6. The spatial large-corner durable sling connection structure for a suspension bridge as defined in claim 4, wherein: the contact surface of the outer spherical surface and the inner spherical surface is provided with polytetrafluoroethylene fiber fabric as a lubricating layer.

7. The spatial large-corner, durable sling attachment structure for a suspension bridge of claim 6, wherein: the polytetrafluoroethylene fiber fabric is arranged on the inner spherical surface of the bearing outer ring and is not exposed all the time when the outer spherical surface and the inner spherical surface rotate relatively.

8. The spatial large-corner durable sling connection structure for a suspension bridge as defined in claim 4, wherein: and the bearing outer ring or the bearing inner ring is provided with a sealing structure at the inner spherical surface or the outer spherical surface, and the sealing structure forms a seal for preventing the bearing outer ring or the bearing inner ring from invading and contacting the spherical surface.

9. The spatial large-corner, durable sling attachment structure for a suspension bridge of claim 8, wherein: the sealing structure is arranged at the edges of two sides of the bearing outer ring and consists of a sealing groove and special-shaped sealing rings, the special-shaped sealing rings are arranged in the sealing groove, and the special-shaped sealing rings and the outer spherical surface of the bearing inner ring keep sliding contact with each other to achieve the sealing effect.

10. The spatial large-corner, durable sling attachment structure for a suspension bridge of claim 9, wherein: the seal groove forms an exposed gap along the axial direction of the bearing outer ring, the special-shaped seal ring is provided with a bevel edge lip overflowing out of the gap, and the bevel edge lip is in interference fit with the bearing inner ring to realize the outer spherical surface always attached to the bearing inner ring.

11. The spatial large-corner, durable sling attachment structure for a suspension bridge of claim 10, wherein: the bevel edge lip is provided with a groove or an inner hole so as to have elastic characteristics.

12. The spatial large-corner, durable sling attachment structure for a suspension bridge of claim 10, wherein: the bevel edge lip is provided with a contact tangent plane, and is attached to the outer spherical surface of the bearing inner ring through the contact tangent plane.

13. The spatial large-corner, durable sling attachment structure for a suspension bridge of claim 10, wherein: the special-shaped sealing ring is provided with a protruding positioning flange, the notch is provided with a step extending along the radial direction of the bearing outer ring, and the flange and the step are in radial conflict in the radial direction of the bearing outer ring.

14. The spatial large-corner durable sling connecting structure for a suspension bridge as defined in claim 1, wherein: the bushing and the pin hole of the lug plate are in interference fit in the radial direction so that the bushing is clamped in the pin hole.

15. The spatial large-corner durable sling connecting structure for a suspension bridge as defined in claim 1, wherein: the bush comprises an annular backing, polytetrafluoroethylene fiber fabrics are arranged on the inner peripheral wall of the annular backing and serve as a lubricating layer, and a pin shaft penetrating through an inner hole of the annular backing is movably matched with the lubricating layer.

16. The spatial large-corner, durable sling attachment structure for a suspension bridge of claim 15, wherein: the bushing is provided with a sealing structure and comprises a sealing groove arranged on an inner hole of the annular backing and an O-shaped sealing ring arranged in the sealing groove, and the O-shaped sealing ring acts on a pin shaft penetrating through the inner hole of the annular backing; the sealing structure has two setting positions which are respectively positioned at two sides of the annular back lining and respectively form end part sealing to two ends of the lubricating layer.

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