High-durability sling flexible sealing anchor head structure and mounting method

Abstract

The invention discloses a high-durability sling flexible sealing anchor head structure and a mounting method. The high-durability sling flexible sealing anchor head structure comprises a sling strand, a sealing sleeve, sealing filler, a first sealing rubber plate, a second sealing rubber plate, a pressing plate, a sling anchor cup and a sling fork lug. One end of the sling fork lug is hinged with the stiffening beam, and the other end is detachably connected with the sling anchor cup through threads; a sealing sleeve is assembled in the end, away from the sling fork lug, of the sling anchor cup and connected with the sling anchor cup through a pressing plate, a second sealing rubber plate is clamped between the sealing sleeve and the sling anchor cup, and a first sealing rubber plate is clamped between the sealing sleeve and the pressing plate. The sling strand is arranged in the sealing sleeve and the sling anchor cup in a penetrating mode in the axial direction, and a gap between the sealing sleeve and the sling strand is filled with sealing filler to form sealing fit. The risk of thread fatigue fracture is reduced through the flexible connecting structure, the waterproof reliability is improved by combining multiple sealing design, the problems of waterproof failure and structural safety of an existing sling lower anchor head are effectively solved, and the service life of a sling system is prolonged.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of bridge engineering, and more particularly relates to a high-durability sling flexible sealing anchor head structure and a mounting method. BACKGROUND

[0002] The sling is a core load-bearing component of a suspension bridge, mainly serving the function of connecting the main beam and the main cable, and in addition to bearing the structural dead load, it also needs to bear the live load for a long time during the operation of the bridge. The sling anchor head, as a key anchoring component of the sling, its structural reliability and sealing performance directly determine the overall operation safety of the suspension bridge, and the sealing protection and structural strength of the lower sling anchor head are the core link to ensure the long-term service of the sling.

[0003] The sealing structure of the existing lower sling anchor head has obvious defects. The port adopts the form of sealing sleeve directly screwed on the end face of the anchor cup for waterproofing. Although the contact position of the sealing sleeve and the PE sleeve can be assisted by the waterproof cover for sealing, the waterproof cover and the PE sleeve are rigidly connected, and the gap is easy to occur at the matching surface, and the waterproof cover is only sealed by the sealing ring inside, which is single in form and cannot achieve complete sealing. From the engineering practice, in multiple similar suspension bridge projects, water accumulation has occurred at the position of the waterproof cover, which seriously deviates from the design expectation and actual use requirement, and is easy to cause the internal components of the anchor head to be corroded by water vapor and fail.

[0004] At the same time, the safety of the existing connection structure also has defects. The sealing sleeve and the anchor cup are connected by internal threads. Although the thread connection itself has a certain reliability, the sling will produce reciprocating swing in the transverse and longitudinal directions under the action of the live load, and the swing amplitude of the short sling is more significant. This long-term reciprocating swing will cause the thread connection to continuously bear alternating stress, especially under the working condition of frequent live load, the thread part is easy to be broken due to fatigue accumulation, which directly threatens the safety of the sling anchoring. In addition, the structural strength design is also limited by the relief groove: in the process of thread processing of the anchor cup and the fork ear, in order to solve the problem that the tail trajectory depth of the thread is insufficient and cannot be completely screwed with the nut, a relief groove with a depth slightly larger than the thread depth needs to be set at the tail of the thread. However, the internal and external threads at the connection between the anchor cup and the fork ear need to be correspondingly provided with a relief groove, which will directly weaken the cross-sectional thickness of the anchor cup and the fork ear, resulting in that the component cannot realize equal strength design, and the position of the relief groove becomes a weak point of the structure, which is easy to be damaged first in the process of stress. SUMMARY

[0005] In view of the above defects or improvement needs of the prior art, the present application provides a high-durability sling flexible sealing anchor head structure and a mounting method, which forms an umbrella-shaped structure by extruding a PE sleeve on the outside of the sealing sleeve interlayer, uses the embedding and fixing of the annular clamping block on the inside of the PE sleeve and the annular clamping groove on the outside of the sealing sleeve interlayer, and cooperates with the extension of the PE sleeve along the sling strand to form a continuous outer layer waterproof barrier, which cooperates with the inside sealing filler and O-shaped sealing ring to build multiple sealing defense lines, enhances the long-term waterproof reliability of the lower anchor head, and effectively blocks the damage of moisture, salt and other corrosive media to the internal structure; the flexible connection of the sealing sleeve and the sling anchor cup is realized by using a pressing plate, the first sealing rubber plate is clamped between the pressing plate transverse plate and the sealing sleeve limiting plate, the second sealing rubber plate is arranged between the sling anchor cup and the limiting plate, the vibration energy under the reciprocating action of the sling live load is absorbed by using the flexible property of the rubber plate, rigid impact is avoided from being transmitted to the connection part, compared with the traditional rigid connection of threads, the alternating stress at the threaded connection part can be reduced, the risk of thread fatigue fracture is reduced from the root, and the structural stability of the anchor head connection is ensured.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a high-durability sling flexible sealing anchor head structure is provided, which comprises a sling strand, a sealing sleeve, a sealing filler, a first sealing rubber plate, a second sealing rubber plate, a pressing plate, a sling anchor cup and a sling yoke. One end of the sling yoke is hinged with the stiffened beam through a pin shaft, and the other end is detachably connected with the sling anchor cup through threaded cooperation, and the inside of the end of the sling anchor cup away from the sling yoke is equipped with the sealing sleeve, and the sealing sleeve is connected with the sling anchor cup through the pressing plate, so that damage under fatigue action under the reciprocating action of the live load is avoided; The second sealing rubber plate is clamped between the sealing sleeve and the sling anchor cup, and the first sealing rubber plate is clamped between the sealing sleeve and the pressing plate; The sling strand is arranged in the inside of the sealing sleeve and the sling anchor cup along the axial direction, and the sealing filler is poured into the gap between the sealing sleeve and the sling strand, so as to form a sealing cooperation, improve the long-term waterproof reliability of the lower anchor head, and reduce the damage of moisture, salt and other corrosive media to the internal structure of the anchor head.

[0007] Further, the sling yoke comprises a yoke head, a transition section and a connecting section connected in sequence, an outer thread is arranged on the outer peripheral wall of the connecting section, threaded cooperation is formed between the outer thread and the inner thread of the sling anchor cup, the transition section is arranged between the yoke head and the connecting section, the hole diameter gradually decreases from the yoke head to the connecting section, the yoke head is a U-shaped structure, and coaxial pin holes are arranged on the two side walls of the yoke head.

[0008] Furthermore, the inside of the sling anchor cup is provided with a through hole, which includes a connecting hole section, a fixing hole section, an outlet hole section and an installation hole section connected in sequence. The inner side wall of the connecting hole section is provided with an internal thread that matches the external thread of the connecting section, so as to form a threaded engagement with the external thread of the connecting section. The side wall of the connecting hole section is provided with a shaft hole in the circumferential direction. The inner diameter of the fixing hole section gradually decreases from the connecting hole section to the outlet hole section. Its interior is used to accommodate the sling strands. By pouring copper-zinc alloy, the sling strands, the copper-zinc alloy and the sling anchor cup are integrated into a structure, so as to fix the sling strands in the sling anchor cup. The outlet section is used to accommodate the sling strands. By injecting copper-zinc alloy, the sling strands, copper-zinc alloy and sling anchor cup are integrated into a structure, and the sling strands are guided to converge, so that the sling strands are in a condensed state after they extend out of the outlet section. The inner diameter of the mounting hole section is larger than the inner diameter of the outlet hole section, and the two form a stepped structure at the connecting end.

[0009] Furthermore, the inner end of the connecting hole section is provided with a tool relief groove, which is located between the connecting hole section and the fixing hole section. The connecting hole section has a locally thickened wall structure on the outer wall corresponding to the tool relief groove.

[0010] Furthermore, the sealing sleeve includes a connecting cylinder and a limiting plate. The inner diameter of the connecting cylinder gradually decreases from left to right. The limiting plate has an annular structure and is fixed to the outer left peripheral wall of the connecting cylinder. A second sealing rubber plate with an L-shaped annular structure is sandwiched between the left side wall of the limiting plate and the inner wall and end side wall of the mounting hole section.

[0011] Furthermore, the pressure plate includes a horizontal plate and a vertical plate. The upper end of the vertical plate has a first threaded hole in the middle and a groove at its lower end. The outer side wall of the left end of the sling anchor cup has symmetrical second threaded holes. By screwing the bolt into the first threaded hole and the second threaded hole to fix it to the sling anchor cup, the connection between the sealing sleeve and the sling anchor cup is realized. The two sides of the horizontal plate are symmetrically fixed with limiting blocks, and the side wall of the limiting plate is symmetrically opened with two limiting grooves along its axis to form an interlocking constraint on the first sealing rubber plate.

[0012] Furthermore, the sealing filler is a vulcanized sealant.

[0013] Furthermore, the sealing sleeve interlayer includes a sleeve connecting section and a cable strand connecting section. The inner diameter of the sleeve connecting section is gradually reduced from left to right. The cable strand connecting section is fixed to the small inner diameter end of the sleeve connecting section. Its inner diameter remains consistent along the axial direction, and the inner diameter of the cable strand connecting section is smaller than the inner diameter of the small inner diameter end of the sleeve connecting section. A stepped structure is formed at the joint between the two. The inner sidewall of the cable strand connection section has two sealing ring mounting grooves spaced apart along the axial direction. O-rings are embedded in the sealing ring mounting grooves and are coaxially sleeved on the outside of the cable strand. The outer wall of the sealing sleeve interlayer is provided with multiple annular grooves spaced apart along the axial direction. A PE sleeve is fitted on the outer side of the sealing sleeve interlayer. The PE sleeve extends along the axial direction and covers the outer side of the sling strand. The inner wall of the PE sleeve corresponding to the outer section of the sealing sleeve interlayer is provided with an annular locking block that is adapted to and engages with the annular grooves.

[0014] According to a second aspect of the present invention, an installation method for a high-durability sling flexible sealing anchor head structure is provided, which is implemented using the aforementioned high-durability sling flexible sealing anchor head structure, and includes the following steps: S100: First, install the second sealing rubber plate at the end step of the sling anchor cup installation hole section. Then, extend the left side of the sealing sleeve into the installation hole section so that the left side wall of the limiting plate fits against the second sealing rubber plate. Then, place the first sealing rubber plate at the corresponding position on the right side wall of the limiting plate of the sealing sleeve. Cover the outside of the first sealing rubber plate with the horizontal plate of the pressure plate. Connect and fix the three by passing the bolt through the first threaded hole of the vertical plate and the second threaded hole of the sling anchor cup. At the same time, ensure that the first sealing rubber plate is embedded between the limiting groove and the limiting block. S200: The connecting sleeve through which the sling strands are axially inserted is made, and its front end is smoothly inserted into the preset position inside the sling anchor cup. Zinc-copper alloy is poured from the rear end of the sling anchor cup to ensure that the alloy fully fills the gap between the strands and the cavity inside the anchor cup. After the alloy solidifies, a reliable anchoring structure is formed. S300: Install a baffle at the corresponding position on the outside of the sealing sleeve, and inject vulcanizing sealant as a sealing filler through the annular gap between the sealing sleeve and the cable strands to ensure that the filler fills the gap and fits tightly against the two side walls. After vulcanization and curing, an inner radial sealing barrier is formed. S400: O-rings are respectively installed in the two sealing ring mounting grooves on the inner side wall of the cable-stranded section of the sealing sleeve interlayer. Then, the sealing sleeve interlayer equipped with O-rings is coaxially fitted onto the outside of the connecting cylinder of the sealing sleeve along the axial direction, so that the tapered inner wall of the sleeve section fits against the outer wall of the connecting cylinder, and the stepped structure at the junction of the cable-stranded section and the sleeve section abuts against the end of the connecting cylinder, so as to achieve a tight fit between the two. S500: The PE sleeve is wrapped around the outside of the sling strands using an extrusion process. The PE sleeve is controlled to extend axially to the outer wall of the sealing sleeve interlayer, so that the annular locking block on the inner side of the PE sleeve and the annular locking groove on the outer wall of the sealing sleeve interlayer can be precisely engaged to form a stable nested connection. S600: The sling fork lug is screwed onto the rear end of the sling anchor cup via a threaded structure. A steel bar is inserted into the shaft hole to provide a fulcrum for applying force, thus completing the assembly of the overall structure of the sling anchor head.

[0015] Further, after the sling anchor cup and the cast zinc-copper alloy have completely cooled and solidified, a top-pressing operation is performed on the zinc-copper alloy. The sling anchor cup is fixed to the top-pressing fixture, and a baseline is marked on the sling strands on the outlet hole side. The top-pressing head is axially aligned with the solidified alloy end face and a top pressure is applied. The pressure is maintained for 5 minutes. After the pressure is released, the outward displacement of the sling strands relative to the baseline is measured. If the outward displacement is ≤5mm, it is considered qualified. If the outward displacement is >5mm, the injected alloy must be melted and removed, and the casting and top-pressing process must be repeated.

[0016] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects: 1. The high-durability flexible sealing anchor head structure of the present invention forms an umbrella-shaped structure by extruding a PE sleeve on the outer side of the sealing sleeve interlayer. The annular locking block on the inner side of the PE sleeve is fitted and fixed with the annular locking groove on the outer side wall of the sealing sleeve interlayer, and extends and covers along the sling strands to form a continuous outer waterproof barrier. At the same time, the rigid nesting cooperation between the PE sleeve and the sealing sleeve interlayer, together with the inner sealing filler and O-ring seal, forms multiple sealing defenses, which significantly improves the long-term waterproof reliability of the lower anchor head and reduces the damage to the internal structure of the anchor head by corrosive media such as water and salt.

[0017] 2. The high-durability flexible sealing anchor head structure of the present invention achieves a flexible connection between the sealing sleeve and the sling anchor cup through a pressure plate. A first sealing rubber plate is sandwiched between the horizontal plate of the pressure plate and the limiting plate of the sealing sleeve, and a second sealing rubber plate is provided between the sling anchor cup and the limiting plate. The flexible characteristics of the rubber plate can absorb the vibration energy of the sling under the reciprocating action of the live load, and avoid the rigid impact between the sealing sleeve and the anchor cup from being transmitted to the connection part. Compared with the threaded rigid connection between the sealing sleeve and the anchor cup in the prior art, this structure reduces the alternating stress at the threaded connection through flexible buffering, fundamentally reducing the risk of thread fracture due to fatigue, and ensuring the structural stability of the anchor head connection.

[0018] 3. The high-durability flexible sealing anchor head structure of the present invention increases the bearing area of ​​the cross section by adopting a local thickening structure at the anchor cup relief groove, thereby improving the shear and tensile strength. The transition section is set between the fork lug head and the connecting section as a transition connection structure between the two. Its aperture gradually decreases from the fork lug head to the connecting section, which can effectively eliminate stress concentration in the threaded connection area of ​​the fork lug and avoid the weak stress point in this area. Attached Figure Description

[0019] Figure 1 This is a half-sectional structural diagram of a high-durability sling flexible sealing anchor head structure according to an embodiment of the present invention; Figure 2This is a schematic diagram of a high-durability sling flexible sealing anchor head structure according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the sealing sleeve interlayer of a high-durability sling flexible sealing anchor head structure according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the sealing sleeve of a high-durability flexible sealing anchor head structure for slings according to an embodiment of the present invention; Figure 5 This is a structural plan view of the sealing sleeve of a high-durability flexible sealing anchor head structure for slings, according to an embodiment of the present invention. Figure 6 This is a schematic diagram of the pressure plate of a high-durability flexible sealing anchor head structure for slings according to an embodiment of the present invention; Figure 7 for Figure 2 Enlarged view of a portion of point A in the middle; Figure 8 This is a schematic diagram of the sling anchor cup of a high-durability flexible sealing anchor head structure according to an embodiment of the present invention; Figure 9 This is a schematic diagram of the sling fork lug of a high-durability flexible sealing anchor head structure according to an embodiment of the present invention; Figure 10 This is a schematic diagram of the installation method of a high-durability sling flexible sealing anchor head structure according to an embodiment of the present invention.

[0020] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-sling strand, 2-PE sleeve, 21-annular locking block, 3-sealing sleeve interlayer, 31-sleeve connecting section, 32-sling strand connecting section, 33-annular groove, 34-sealing ring mounting groove, 4-O-ring seal, 5-sealing sleeve, 51-connecting cylinder, 52-limiting plate, 53-limiting groove, 6-sealing filler, 7-first sealing rubber plate, 8-second sealing rubber plate, 9-pressure plate, 91-horizontal plate, 911-limiting block, 92-vertical plate, 921-first threaded hole, 922-groove, 10-sling anchor cup, 101-connecting hole section, 102-fixing hole section, 103-contraction hole section, 104-mounting hole section, 105-second threaded hole, 11-sling fork lug, 111-fork lug head, 112-transition section, 113-connecting section. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0022] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0023] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0024] In this patent, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0025] Example 1 like Figures 1-9As shown, this embodiment of the invention provides a high-durability flexible sealing anchor head structure for slings, including a sling strand 1, a sealing sleeve 5, a sealing filler 6, a first sealing rubber plate 7, a second sealing rubber plate 8, a pressure plate 9, a sling anchor cup 10, and a sling fork lug 11. One end of the sling fork lug 11 is hinged to a stiffening beam via a pin, and the other end is detachably connected to the sling anchor cup 10 via a threaded connection. A sealing sleeve 5 is fitted inside the end of the sling anchor cup 10 away from the sling fork lug 11, and the sealing sleeve 5 is connected to the sling anchor cup 10 via the pressure plate 9. A second sealing rubber plate 8 is sandwiched between the sealing sleeve 5 and the sling anchor cup 10, and a first sealing rubber plate 7 is sandwiched between the sealing sleeve 5 and the pressure plate 9. The sling strand 1 passes axially through the interior of the sealing sleeve 5 and the sling anchor cup 10, and the gap between the sealing sleeve 5 and the sling strand 1 is filled with sealing filler 6 to form a sealing fit. The multi-layer sealing structure significantly enhances corrosion resistance. The sealing filler 6 injected between the sealing sleeve 5 and the cable strand 1 fills the gap between them, forming a core sealing barrier that effectively blocks the intrusion of corrosive media such as moisture and salt. Simultaneously, the second sealing rubber plate 8 between the sealing sleeve 5 and the cable anchor cup 10 further intercepts leakage media. This dual sealing effect significantly reduces the corrosion risk of the steel components inside the anchor head. The first sealing rubber plate 7, made of flexible rubber, absorbs the impact energy generated by vibration and temperature changes during the cable's service life, buffering the rigid contact between the sealing sleeve 5 and the pressure plate 9, preventing loosening of component connections or damage to the sealing structure due to long-term vibration. The second sealing rubber plate 8 also helps adapt to minor deformations of various components, further improving the overall performance. The structure exhibits excellent vibration resistance and stability. The sling fork lug 11 and sling anchor cup 10 are detachably connected via threaded engagement. The sealing sleeve 5 is fixed to the sling anchor cup 10 via pressure plate 9. The connection methods of each component are clear and easy to disassemble and assemble, facilitating later inspection, maintenance, or replacement of partial components. Furthermore, the fixing effect of pressure plate 9 on sealing sleeve 5 ensures that it does not shift under long-term vibration and stress, guaranteeing the stability of the sealing and vibration-resistant structure. This structure is highly adaptable, meeting the requirements for hinged connection between the sling and stiffening beam while protecting key parts such as the sling strand 1 and threaded connection inside the anchor head through sealing protection. This reduces damage to the anchor head caused by corrosion, vibration fatigue, and other issues, lowers the safety risks caused by anchor head failure, indirectly extends the overall service life of the sling, and reduces engineering operation and maintenance costs.

[0026] Furthermore, the sling fork lug 11 includes a lug head 111, a transition section 112, and a connecting section 113 connected in sequence. The outer peripheral wall of the connecting section 113 is provided with an external thread, which forms a threaded engagement with the internal thread of the sling anchor cup 10, thereby realizing a detachable and fixed connection between the sling fork lug 11 and the sling anchor cup 10. The transition section 112 is disposed between the lug head 111 and the connecting section 113, serving as a transitional connection structure between the two. Its aperture gradually decreases from the lug head 111 to the connecting section 113, which can effectively eliminate stress concentration in the threaded connection area of ​​the lug and avoid the weak stress point in this area. The lug head 111 has a U-shaped structure, with coaxial pin holes correspondingly opened on its two side walls. During assembly, the pin passes through the pin hole to form a rotating connection with the stiffening beam, thereby realizing the assembly and fixation of the sling and the stiffening beam. The U-shaped fork head 111, in conjunction with the shaft pin, forms a rotating connection with the stiffening beam, which can adapt to the angle changes of the sling during the stress process, reduce the additional stress generated by the rigid connection, and improve the stability and durability of the connection structure. The transition section 112 adopts a gradually narrowing hole design, which can effectively eliminate stress concentration at the junction of the fork head 111 and the connecting section 113, avoid the formation of weak points due to uneven stress in the threaded area, and significantly enhance the load-bearing capacity and fatigue resistance of the overall structure. The connecting section 113 achieves threaded engagement with the sling anchor cup 10 through external threads, which not only facilitates the quick assembly and subsequent maintenance and replacement of the sling fork head 11 and the anchor cup, but also ensures the connection strength through the pre-tightening force of the threaded connection, thereby improving the overall safety of the sling system.

[0027] Furthermore, the sling anchor cup 10 has a through hole inside, which includes a connecting hole section 101, a fixing hole section 102, an outlet hole section 103, and a mounting hole section 104 connected in sequence. The inner side wall of the connecting hole section 101 has an internal thread that matches the external thread of the connecting section 113, so as to form a threaded engagement with the external thread of the connecting section 113. The side wall of the connecting hole section 101 has a shaft hole along the circumferential direction. When the sling anchor cup 10 and the sling fork lug 11 are threadedly connected, the shaft hole can be inserted into the shaft hole. A steel bar is inserted to provide a fulcrum for force application, facilitating the assembly and connection of the two. The inner diameter of the fixing hole section 102 gradually decreases from the connecting hole section 101 to the outlet hole section 103. Its interior is used to accommodate the sling strand 1, and the sling strand 1, the copper-zinc alloy, and the sling anchor cup 10 are integrated into a single structure by pouring in copper-zinc alloy, thereby fixing the sling strand 1 within the sling anchor cup 10. The outlet hole section 103 is also used to accommodate the sling strand 1, and similarly, the sling strand 1, the copper-zinc alloy, and the sling anchor cup 10 are integrated by pouring in copper-zinc alloy. The structure guides and converges the sling strands 1, causing them to converge after extending from the outlet section 103. The fixing section 102 employs a tapered inner diameter structure, combined with a copper-zinc alloy infusion process, to progressively constrain the sling strands 1 through the gradual structure. Combined with the solidification effect of the alloy material, this creates a high-strength integrated structure of the sling strands 1, the alloy, and the anchor cup, significantly improving the firmness of the strand fixation and the continuity of force transmission. The outlet section 103 not only continues the alloy solidification and fixing function but also provides further guidance for the extended strands. The sling strands 1 form a convergent guide to avoid localized stress concentration caused by strand dispersion; the inner diameter of the mounting hole section 104 is larger than the inner diameter of the outlet hole section 103, and the two form a stepped structure at the connecting end; this stepped structure is used to provide axial limiting and radial adaptation for the sealing sleeve 5, so as to achieve precise assembly and positioning of the sealing sleeve 5 in the mounting hole section 104, thereby enhancing the sealing and protective performance of the sling system, effectively preventing corrosive media such as water vapor and impurities in the external environment from invading the internal structure, and extending the overall service life of the sling.

[0028] Furthermore, the inner end of the connecting hole section 101 is provided with a relief groove, which is located between the connecting hole section 101 and the fixing hole section 102. This groove is used to ensure that the root depth of the sawtooth thread provided in the connecting hole section 101 is consistent, thereby improving the thread connection performance between the connecting section 113 and the connecting hole section 101.

[0029] Furthermore, the connecting hole section 101 has a locally thickened wall structure on the outer side wall corresponding to the relief groove, which can effectively eliminate the weak point of the sling anchor cup in this area, effectively avoid the risk of stress concentration, and enhance the structural bearing capacity and fatigue resistance of the sling anchor cup in the key connection part.

[0030] Furthermore, such as Figure 5As shown, the sealing sleeve 5 includes a connecting sleeve 51 and a limiting plate 52; wherein, the inner diameter of the connecting sleeve 51 gradually decreases from left to right, which can further guide the sling strands 1 to converge; during assembly, the left side of the connecting sleeve 51 extends into the mounting hole section 104, and a gap is reserved between its left end and the end face of the outlet hole section 103. This gap can prevent the connecting sleeve 51 from directly contacting the outlet hole section 103, prevent frictional loss between components due to vibration, and provide a buffer margin for deformation of the sealing structure; the limiting plate 52 has an annular structure and is fixed to the left outer peripheral wall of the connecting sleeve 51, which can control the assembly position of the sealing sleeve 5 in the mounting hole section 104. Axial limiting is performed to prevent the sealing sleeve 5 from axially displacing due to force or vibration, ensuring the relative position stability between the sealing structure and the sling anchor cup 10 to guarantee the sealing effect; a second sealing rubber plate 8 with an L-shaped annular structure is sandwiched between the left side wall of the limiting plate 52 and the inner wall of the mounting hole section 104 and the end side wall of the mounting hole section 104. The L-shaped structure of the second sealing rubber plate 8 can form a complete seal with the mating surface, effectively blocking external water vapor, impurities and other corrosive media from entering the anchor head to improve the sealing and protection performance. Its rubber material flexibility can also absorb the vibration energy during the service of the sling, playing a buffer and shock absorption role, and avoiding structural damage caused by vibration impact between rigid components.

[0031] Furthermore, such as Figure 1 and Figure 2 The pressure plate 9 includes a horizontal plate 91 and a vertical plate 92. The vertical plate 92 has a first threaded hole 921 at the middle of its upper end and a groove 922 at its lower end. The outer wall of the left end of the sling anchor cup 10 has symmetrical second threaded holes 105. By screwing bolts into the first threaded holes 921 and the second threaded holes 105, the sealing sleeve 5 is connected to the sling anchor cup 10, thus achieving the connection between them. Limiting blocks 911 are symmetrically fixed on both sides of the horizontal plate 91, which laterally limit the first sealing rubber plate 7 to prevent it from shifting. The sidewalls of the limiting plate 52 are symmetrical along its axis. Two limiting grooves 53 are provided to form a fitting constraint on the first sealing rubber plate 7, restricting its circumferential movement. In the assembled state, the first sealing rubber plate 7 is sandwiched between the horizontal plate 91 and the limiting plate 52, and the first sealing rubber plate 7 is embedded in the limiting groove 53 and simultaneously limited between the limiting blocks 911 on both sides of the horizontal plate 91. Through the synergistic effect of the limiting groove 53 and the limiting blocks 911, the circumferential and radial displacement of the first sealing rubber plate 7 is constrained, ensuring that it always maintains a stable fit with the horizontal plate 91 and the limiting plate 52 when the sling vibrates or is under stress, thereby reliably performing the functions of shock absorption and friction isolation.

[0032] Furthermore, a sealing filler 6 is injected into the gap between the sealing sleeve 5 and the cable strand 1. The sealing filler 6 is a vulcanized sealant, which forms an elastic cured body through a vulcanization reaction. It can tightly fill the irregular gap between the sealing sleeve 5 and the cable strand 1, forming a continuous sealing barrier that adapts to the slight movement of the cable strand. This effectively prevents external water vapor, impurities and other corrosive media from entering the anchor head. It can also adapt to the expansion, contraction or vibration of the cable strand 1 under stress, avoiding cracking failure caused by rigid sealing, and maintaining reliable sealing performance for a long time, thereby protecting the cable strand 1 from corrosion damage.

[0033] Furthermore, further, such as Figure 6 As shown, the sealing sleeve interlayer 3 includes a sleeve connecting section 31 and a cable-strand connecting section 32; wherein, the inner diameter of the sleeve connecting section 31 is gradually reduced from left to right, for forming a sleeve fit with the outer wall of the connecting cylinder 51, and the tapered surface of the outer wall of the connecting cylinder 51 is fitted with the tapered structure to enhance the radial constraint after assembly; the cable-strand connecting section 32 is fixed to the small inner diameter end of the sleeve connecting section 31, and its inner diameter is consistent along the axial direction, and the inner diameter of the cable-strand connecting section 32 is smaller than the inner diameter of the small inner diameter end of the sleeve connecting section 31, forming a stepped structure at the joint; during assembly, this stepped structure and the connecting cylinder 51... The end of 1 forms an axial abutment, which on the one hand precisely limits the assembly position of the sealing sleeve interlayer 3, and on the other hand, through the end face abutment and the conical surface fit of the sleeve connecting section 31, ensures a tight fit between the sealing sleeve interlayer 3 and the connecting cylinder 51, avoiding the generation of gaps; the inner side wall of the cable strand connecting section 32 is provided with two sealing ring mounting grooves 34 at axial intervals, and the sealing ring mounting grooves 34 are embedded in the O-ring sealing rings 4, and the O-ring sealing rings 4 are coaxially sleeved on the outside of the cable strand 1. Through the elastic deformation of the O-ring sealing rings 4, a tight fit is formed with the outer wall of the cable strand 1, constructing a radial sealing barrier.

[0034] Furthermore, the outer wall of the sealing sleeve interlayer 3 is provided with multiple annular grooves 33 spaced apart along the axial direction; a PE sleeve 2 is fitted on the outer side of the sealing sleeve interlayer 3, which extends along the axial direction and covers the outer side of the sling strand 1; wherein, the inner wall of the outer section of the sealing sleeve interlayer 3 corresponding to the PE sleeve 2 is provided with annular locking blocks 21 that are adapted to and engaged with the annular grooves 33. By engaging the annular groove 33 with the annular block 21, a dual constraint in both circumferential and axial directions can be formed between the PE sleeve 2 and the sealing sleeve interlayer 3, preventing the PE sleeve 2 from slipping or detaching due to sling vibration, temperature changes, or external pulling force, thus ensuring the continuity of the PE sleeve 2's coverage of the sealing sleeve interlayer 3 and the sling strand 1. At the same time, combined with the extended coverage design of the PE sleeve 2, it can further block the intrusion of external corrosive media along the gap between the sealing sleeve interlayer 3 and the PE sleeve 2, and work together with the inner O-ring seal 4 and sealing filler 6 to form a full-length protective barrier from the anchor head to the sling strand, significantly improving the overall corrosion resistance and structural durability of the sling system.

[0035] Furthermore, the sealing sleeve interlayer 3 is made of rigid polystyrene; as an intermediate support component between the connecting cylinder 51 and the PE sleeve 2, its rigidity ensures a tight fit between the sleeve fitting section 31 and the conical surface of the connecting cylinder 51. The structural rigidity maintains the assembly shape of both, preventing gaps from forming between the connecting cylinder 51 and the sealing sleeve interlayer 3 due to external vibration or stress, thus ensuring the sealing performance of this mating part. Simultaneously, regarding its nesting relationship with the PE sleeve 2, the dimensional stability of the polystyrene material ensures that the annular groove 33 on the outer wall maintains a precise geometric shape, ensuring a tight fit with the PE sleeve. The inner annular locking block 21 forms a reliable fit, providing a stable assembly base for the PE sleeve 2 and preventing the PE sleeve 2 from loosening or shifting due to base deformation during the covering process. In addition, located in the middle protective layer position of the sealing system, its chemical stability can resist the intrusion of external corrosive media from the gap between the PE sleeve 2 and the sealing sleeve interlayer 3, while avoiding its own corrosion damage, which would affect the installation and positioning of the inner O-ring seal 4. Thus, a rigid transition and functional connection are formed between the outer sealing layer of the connecting cylinder 51 and the outer protection layer of the PE sleeve 2, strengthening the continuity and reliability of the overall sealing defense line.

[0036] Example 2 Combination Figures 1-9 ,like Figure 10 As shown, this invention provides an installation method for a high-durability sling flexible sealing anchor head structure, which is implemented using the aforementioned high-durability sling flexible sealing anchor head structure. The specific steps are as follows: S100: First, install the second sealing rubber plate 8 at the end step of the mounting hole section 104 of the sling anchor cup 10. Then, extend the left side of the sealing sleeve 5 into the mounting hole section 104 so that the left side wall of the limiting plate 52 fits against the second sealing rubber plate 8. Then, place the first sealing rubber plate 7 at the corresponding position on the right side wall of the limiting plate 52 of the sealing sleeve 5. Cover the outside of the first sealing rubber plate 7 with the horizontal plate 91 of the pressure plate 9. Connect and fix the three by passing the first threaded hole 921 of the vertical plate 92 and the second threaded hole 105 of the sling anchor cup 10 through the bolt. At the same time, ensure that the first sealing rubber plate 7 is embedded between the limiting groove 53 and the limiting block 911. S200: The connecting sleeve 51 of the sealing sleeve 5 is inserted through the axial direction of the sling strand 1, and its front end is smoothly inserted into the preset position inside the sling anchor cup 10. Zinc-copper alloy is poured from the rear end of the sling anchor cup 10 to ensure that the alloy fully fills the gap between the strands and the cavity inside the anchor cup. After the alloy is cured, a reliable anchoring structure is formed. S300: Install a baffle at the corresponding position on the outside of the sealing sleeve 5, and inject vulcanized sealant as sealing filler 6 through the annular gap between the sealing sleeve 5 and the cable strand 1 to ensure that the filler fills the gap and fits tightly against the two side walls. After vulcanization and curing, an inner radial sealing barrier is formed. S400: O-rings 4 are respectively installed in the two sealing ring mounting grooves 34 on the inner side wall of the cable-stranded section 32 of the sealing sleeve interlayer 3. Then, the sealing sleeve interlayer 3 equipped with O-rings 4 is coaxially sleeved on the outside of the connecting cylinder 51 of the sealing sleeve 5, so that the tapered inner wall of the sleeve-stranded section 31 fits against the outer wall of the connecting cylinder 51, and the stepped structure at the junction of the cable-stranded section 32 and the sleeve-stranded section 31 abuts against the end of the connecting cylinder 51, so as to achieve a tight fit between the two. S500: The PE sleeve 2 is wrapped around the outside of the sling strand 1 by extrusion process. The PE sleeve 2 is controlled to extend axially to the outer wall of the sealing sleeve interlayer 3, so that the annular locking block 21 on the inner side of the PE sleeve 2 and the annular locking groove 33 on the outer wall of the sealing sleeve interlayer 3 can be precisely fitted to form a stable nested connection. S600: The sling fork lug 11 is screwed onto the rear end of the sling anchor cup 10 via a threaded structure. A steel bar is inserted into the shaft hole to provide a fulcrum for applying force, thus completing the assembly of the overall structure of the sling anchor head.

[0037] Further, after the sling anchor cup 10 and the cast zinc-copper alloy have completely cooled and solidified, a top-pressing operation is performed on the zinc-copper alloy. The sling anchor cup 10 is fixed to the top-pressing fixture, and a baseline is marked on the sling strand 1 on the side of the outlet hole section 103. The top-pressing head is axially aligned with the solidified alloy end face and a top pressure is applied, and the pressure is maintained for 5 minutes. After the pressure is released, the outward displacement of the sling strand 1 relative to the baseline is measured. If the outward displacement is ≤5mm, it is considered qualified. If the outward displacement is >5mm, the injected alloy must be melted and removed, and the casting and top-pressing process must be repeated.

[0038] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A highly durable flexible sealing anchor head structure for slings, characterized in that, Includes sling strands (1), sealing sleeves (5), sealing fillers (6), first sealing rubber plates (7), second sealing rubber plates (8), pressure plates (9), sling anchor cups (10), and sling fork lugs (11); among which, One end of the sling fork lug (11) is hinged to the stiffening beam by a pin, and the other end is detachably connected to the sling anchor cup (10) by a threaded connection. The end of the sling anchor cup (10) away from the sling fork lug (11) is equipped with a sealing sleeve (5). The sealing sleeve (5) is connected to the sling anchor cup (10) by a pressure plate (9) to avoid damage under fatigue under the action of live load reciprocating action. A second sealing rubber plate (8) is sandwiched between the sealing sleeve (5) and the sling anchor cup (10), and a first sealing rubber plate (7) is sandwiched between the sealing sleeve (5) and the pressure plate (9). The sling strand (1) is axially inserted into the interior of the sealing sleeve (5) and the sling anchor cup (10), and the gap between the sealing sleeve (5) and the sling strand (1) is filled with sealing filler (6) to form a sealing fit, improve the long-term waterproof reliability of the lower anchor head, and reduce the damage of water, salt and other corrosive media to the internal structure of the anchor head.

2. The high-durability flexible sealing anchor head structure for slings according to claim 1, characterized in that, The sling fork lug (11) includes a fork lug head (111), a transition section (112) and a connecting section (113) connected in sequence. The outer peripheral wall of the connecting section (113) is provided with an external thread, which forms a threaded engagement with the internal thread of the sling anchor cup (10). The transition section (112) is located between the fork lug head (111) and the connecting section (113), and its aperture gradually decreases from the fork lug head (111) to the connecting section (113). The fork lug head (111) has a U-shaped structure, and coaxial pin holes are correspondingly opened on its two side walls.

3. The high-durability flexible sealing anchor head structure for slings according to claim 2, characterized in that, The sling anchor cup (10) has a through hole inside, which includes a connecting hole section (101), a fixing hole section (102), an outlet hole section (103), and an installation hole section (104) connected in sequence. The inner side wall of the connecting hole section (101) has an internal thread that matches the external thread of the connecting section (113) to form a threaded fit with the external thread of the connecting section (113). The side wall of the connecting hole section (101) has a shaft hole along the circumference. The inner diameter of the fixing hole section (102) gradually decreases from the connecting hole section (101) to the outlet hole section (103). Its interior is used to accommodate the sling strand (1). The sling strand (1), the copper-zinc alloy, and the sling anchor cup (10) are integrated by pouring copper-zinc alloy to achieve the fixation of the sling strand (1) in the sling anchor cup (10). The outlet section (103) is used to accommodate the sling strand (1). By injecting copper-zinc alloy, the sling strand (1), the copper-zinc alloy and the sling anchor cup (10) are integrated into a structure, and the sling strand (1) is guided to converge, so that the sling strand (1) is in a condensed state after it extends out of the outlet section (103). The inner diameter of the mounting hole section (104) is larger than the inner diameter of the outlet hole section (103), and the two form a stepped structure at the connecting end.

4. The high-durability flexible sealing anchor head structure for slings according to claim 3, characterized in that, The inner end of the connecting hole section (101) is provided with a tool relief groove, which is located between the connecting hole section (101) and the fixing hole section (102). The connecting hole section (101) has a locally thickened wall structure on the outer wall corresponding to the tool relief groove.

5. The high-durability flexible sealing anchor head structure for slings according to claim 1, characterized in that, The sealing sleeve (5) includes a connecting sleeve (51) and a limiting plate (52). The inner diameter of the connecting sleeve (51) gradually decreases from left to right. The limiting plate (52) has an annular structure and is fixed to the outer left peripheral wall of the connecting sleeve (51). A second sealing rubber plate (8) with an L-shaped annular structure is sandwiched between the left side wall of the limiting plate (52) and the inner wall and end side wall of the mounting hole section (104).

6. The high-durability flexible sealing anchor head structure for slings according to claim 1, characterized in that, The pressure plate (9) includes a horizontal plate (91) and a vertical plate (92). The upper end of the vertical plate (92) is provided with a first threaded hole (921) and the lower end is provided with a groove (922). The outer wall of the left end of the sling anchor cup (10) is provided with symmetrical second threaded holes (105). By screwing the bolt into the first threaded hole (921) and the second threaded hole (105) and fixing it to the sling anchor cup (10), the connection between the sealing sleeve (5) and the sling anchor cup (10) is realized. The two sides of the horizontal plate (91) are symmetrically fixed with limiting blocks (911), and the side wall of the limiting plate (52) is symmetrically opened with two limiting grooves (53) along its axis to form an interlocking constraint on the first sealing rubber plate (7).

7. The high-durability flexible sealing anchor head structure for slings according to claim 1, characterized in that, The sealing filler (6) is a vulcanized sealant.

8. A high-durability sling flexible sealing anchor head structure according to any one of claims 1-7, characterized in that, The sealing sleeve interlayer (3) includes a sleeve connecting section (31) and a cable connecting section (32). The inner diameter of the sleeve connecting section (31) is gradually reduced from left to right. The cable connecting section (32) is fixed to the small inner diameter end of the sleeve connecting section (31). Its inner diameter is consistent along the axial direction. The inner diameter of the cable connecting section (32) is smaller than the inner diameter of the small inner diameter end of the sleeve connecting section (31). The connection between the two forms a stepped structure. The inner sidewall of the cable strand connecting section (32) has two sealing ring mounting grooves (34) spaced apart along the axial direction. The sealing ring mounting grooves (34) are fitted with O-ring seals (4), and the O-ring seals (4) are coaxially sleeved on the outside of the cable strand (1). The outer wall of the sealing sleeve interlayer (3) is provided with multiple annular grooves (33) spaced apart along the axial direction. The outer side of the sealing sleeve interlayer (3) is fitted with a PE sleeve (2). The PE sleeve (2) extends along the axial direction and covers the outer side of the sling strand (1). The inner side wall of the PE sleeve (2) corresponding to the outer side of the sealing sleeve interlayer (3) is provided with an annular locking block (21) that is adapted to and engages with the annular grooves (33).

9. A method for installing a high-durability sling flexible sealing anchor head structure, characterized in that, The high-durability flexible sealing anchor head structure for slings, as described in any one of claims 1-8, is characterized by comprising the following steps: S100: First, install the second sealing rubber plate (8) at the end step of the mounting hole section (104) of the sling anchor cup (10). Then, insert the left side of the sealing sleeve (5) into the mounting hole section (104) so ​​that the left side wall of the limiting plate (52) fits against the second sealing rubber plate (8). Then, place the first sealing rubber plate (7) at the corresponding position on the right side wall of the limiting plate (52) of the sealing sleeve (5). Cover the outside of the first sealing rubber plate (7) with the horizontal plate (91) of the pressure plate (9). Connect and fix the three by passing the bolt through the first threaded hole (921) of the vertical plate (92) and the second threaded hole (105) of the sling anchor cup (10). At the same time, ensure that the first sealing rubber plate (7) is embedded between the limiting groove (53) and the limiting block (911). S200: The connecting sleeve (51) of the sealing sleeve (5) is inserted through the sling strand (1) along the axial direction, and its front end is smoothly inserted into the preset position inside the sling anchor cup (10). Zinc-copper alloy is poured from the rear end of the sling anchor cup (10) to ensure that the alloy fully fills the gap between the strands and the cavity inside the anchor cup. After the alloy is cured, a reliable anchoring structure is formed. S300: Install a baffle at the corresponding position on the outside of the sealing sleeve (5), and inject vulcanized sealant as sealing filler (6) through the annular gap between the sealing sleeve (5) and the sling strand (1) to ensure that the filler fills the gap and fits tightly against the two side walls. After vulcanization and curing, an inner radial sealing barrier is formed. S400: O-rings (4) are respectively installed in the two sealing ring mounting grooves (34) on the inner side wall of the cable-stranded section (32) of the sealing sleeve interlayer (3). Then, the sealing sleeve interlayer (3) equipped with O-rings (4) is coaxially sleeved on the outside of the connecting cylinder (51) of the sealing sleeve (5) along the axial direction, so that the tapered inner wall of the sleeve-sleeve section (31) fits against the outer wall of the connecting cylinder (51), and the stepped structure at the junction of the cable-stranded section (32) and the sleeve-sleeve section (31) abuts against the end of the connecting cylinder (51), so as to achieve a tight fit between the two. S500: The PE sleeve (2) is wrapped around the outside of the cable strand (1) by extrusion process. The PE sleeve (2) is controlled to extend axially to the outer wall of the sealing sleeve interlayer (3), so that the annular block (21) on the inner side of the PE sleeve (2) and the annular groove (33) on the outer wall of the sealing sleeve interlayer (3) are precisely fitted to form a stable nested connection. S600: Connect the sling fork lug (11) to the rear end of the sling anchor cup (10) by screwing it into the threaded structure, and complete the assembly of the sling anchor head structure by inserting a steel bar into the shaft hole to provide a force fulcrum.

10. The installation method of a high-durability sling flexible sealing anchor head structure according to claim 9, characterized in that, After the sling anchor cup (10) and the cast zinc-copper alloy have completely cooled and solidified, the zinc-copper alloy is subjected to a top-pressing operation. The sling anchor cup (10) is fixed to the top-pressing fixture. A baseline is marked on the sling strand (1) on the side of the outlet hole section (103). The top-pressing head is axially aligned with the solidified alloy end face and a top pressure is applied. The pressure is maintained for 5 minutes. After the pressure is released, the outward displacement of the sling strand (1) relative to the baseline is measured. If the outward displacement is ≤5mm, it is considered qualified. If the outward displacement is >5mm, the injected alloy needs to be melted and removed before the casting and top-pressing process is repeated.

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