Cable clamp slippage preventing main cable for suspension bridge, assembly structure of cable clamp slippage preventing main cable and slippage preventing cable clamp and cabling method

Abstract

The invention relates to the technical field of suspension bridges, and particularly discloses a cable clamp slippage preventing main cable for a suspension bridge, an assembly structure of the cable clamp slippage preventing main cable and a slippage preventing cable clamp and a cabling method. The main cable capable of preventing the cable clamp from sliding comprises a main cable body erected in a suspension bridge structure through a catenary structure. A plurality of cable clamping hanging nodes which are arranged at intervals are preset in the length direction of the main cable body; each cable clamp hanging node is provided with a variable-diameter cable clamp mounting section which is gradually increased from top to bottom, and the cable clamp mounting sections are used for connecting cable clamps; and the upper end of the cable clamp mounting section is in smooth transition from the equal-diameter structure of the main cable body. According to the invention, the axial displacement build-in characteristic of the reducing structure on the main cable to the external locked cable clamp is matched with the friction force to resist the gliding component force of the cable clamp, and the build-in pre-tightening force is intensified along with the axial downward gliding of the cable clamp when the cable clamp is kept in a normal locking state; the cable clamp is prevented from slipping on the main cable after loosening due to natural working condition environmental factors in service, and the anti-slipping technical effect is excellent.

Description

Technical Field

[0001] The invention relates to the technical field of suspension bridges, in particular to a main cable with an anti-slip cable clamp for a suspension bridge, an assembly structure between the main cable and the anti-slip cable clamp, and a cabling method for the main cable. Background Art

[0002] In the load-bearing structure system of a suspension bridge, the main cable is supported and turned by anchors and main towers to form a catenary-like erection shape. The suspenders / hangers connecting the bridge deck are connected to the main cable via cable clamps, so that the main cable bears the dynamic and static loads from the bridge deck.

[0003] During the installation of the main cable, the strands with a basically hexagonal cross section are installed one by one in a staggered arrangement from bottom to top and left to right, starting from the bottom corner of the main cable with a basically hexagonal cross section. After the cable is tightened, an equal-diameter structure with a basically circular cross section is formed. Each cable clamp is locked and connected according to the corresponding cable clamp suspension node preset in the length direction of the main cable, forming a spacing arrangement in the length direction of the main cable. In other words, the cable clamp is locked on the main cable of the equal-diameter structure. Due to the catenary installation form of the main cable, most of the cable clamps locked on the main cable are in an inclined arrangement state, but the tension of the connected sling / suspender rod is vertically downward, which will cause the cable clamp to generate a sliding component on the main cable. The sliding component needs to be resisted by the friction resistance of the cable clamp locked on the main cable, that is, the stability of the cable clamp on the main cable completely depends on the friction of the locking bolt on the circumferential docking lock tightness of the cable clamp half. When the locking friction of the cable clamp on the main cable is insufficient, the cable clamp will loosen and slide down on the main cable of the catenary. In recent years, cable clamp slippage has occurred frequently in suspension bridge structures, which will directly affect the redistribution of the force structure system of the suspension bridge, and damage the steel wire and external protective structure of the main cable, increasing safety hazards.

[0004] There are many reasons for the insufficient friction resistance of the cable clamp on the main cable, which is mainly reflected in the thinning of the main cable under the influence of its own weight and the dynamic and static loads of the bridge deck, and the reduction of the effective locking force of the cable clamp's locking bolt. For a long time, in order to prevent the cable clamp from loosening and slipping on the main cable, the technical measures taken are to optimize the design of the cable clamp structure, including increasing the length of the cable clamp to increase the number of locking bolts. However, the overly long cable clamp not only increases the technical difficulty of assembling the cable clamp on the main cable and the difficulty of later monitoring technology, but also generates a large secondary stress on the steel wire of the locked main cable, and even directly causes steel wire damage, which is particularly obvious near the main tower; what's more, since the locking bolt always has an elastic elongation of about 1 to 2 mm, a small diameter reduction change will cause the effective prestress of the locking bolt to be lost, so it is difficult to achieve ideal stability for the cable clamp by simply relying on the locking bolt to lock the cable clamp on the main cable. Summary of the invention

[0005] The technical purpose of the present invention is to provide an anti-cable clamp slippage main cable for a suspension bridge with excellent anti-cable clamp slippage effect, as well as an assembly structure between the main cable and the anti-slip cable clamp and a cabling method for the main cable in view of the particularity of the above-mentioned suspension bridge force structure system and the deficiencies of the prior art.

[0006] The technical purpose of the present invention is achieved by the following technical solution: a cable-slipping main cable of a suspension bridge with an anti-cable clamp, comprising a main cable body erected in a suspension bridge structure with a catenary structure;

[0007] Along the length direction of the main cable body, a plurality of cable clamps and hanging nodes arranged at intervals are preset;

[0008] Each cable clamp hanging node has a cable clamp installation section with a variable diameter structure that increases from small to large from top to bottom, and the cable clamp installation section is used to connect the cable clamps;

[0009] The upper end of the cable clamp installation section smoothly transitions from the equal-diameter structure of the main cable body.

[0010] The above technical measures are aimed at the particularity of the load-bearing structure system of the above-mentioned suspension bridge. The cable clamp on the main cable is set with a variable diameter cone structure. The variable diameter cone structure on the main cable uses the axial displacement embedding characteristics of the externally locked cable clamp to cooperate with the friction force to resist the downward force of the cable clamp, thereby preventing the cable clamp from slipping on the main cable after loosening due to natural working conditions and environmental factors during service, ensuring that the cable clamp forms a stable connection on the main cable, and the anti-slip technology has excellent effect.

[0011] As one of the preferred technical solutions, the cable clamp hanging node has a sliding reserved section at the lower end of the cable clamp installation section and continuing the variable diameter structure of the cable clamp installation section;

[0012] The sliding reserved section is used to leave a margin for the sliding of the cable clamp connected to the cable clamp installation section.

[0013] The above-mentioned technical measures form a reserved section of the variable diameter structure of the continued installation section at the lower end of the preset installation position of the cable clamp, so as to adapt to the slight allowable slip of the cable clamp after loosening due to natural working conditions and environmental factors in the service, thereby enhancing the embedding characteristics of the main cable to the cable clamp, and at the same time preventing the lower end of the slipping cable clamp from being circumferentially deviated in the variable diameter installation structure on the main cable, which is beneficial to the formation of the external protective layer of the main cable and the sealing structure between the main cable and the cable clamp.

[0014] Furthermore, the cable clamp suspension node has a variable diameter structural transition section that changes from large to small from top to bottom;

[0015] The upper end of the transition section smoothly transitions from the lower end of the slip reserved section, and the lower end of the transition section smoothly transitions in the equal-diameter structure of the main cable body.

[0016] The above technical measures are based on the variable diameter structure of the cable clamp installation section on the main cable, so that the cable clamp installation section of the variable diameter structure is tightly and smoothly integrated into the equal diameter structure of the main cable body structure, so as to avoid the cable clamp installation section of the variable diameter structure forming a supporting suspended gap at the lower end, which may adversely affect the overall force-bearing performance and sealing protection performance of the main cable, and at the same time, form a reliable support for the arrangement stability of the cable clamp installation section of the variable diameter structure in the main cable.

[0017] As one of the preferred technical solutions, the main cable body, before the cable tightening construction, is composed of a plurality of strands with hexagonal cross sections arranged in sequence into a hexagonal structure with concentric ring layers in cross section;

[0018] At each cable clamp suspension node on the main cable body, a plurality of conical filling steel wires are filled at the junction between at least one concentric ring layer, and the filling steel wires filled at the junction between the same ring layers constitute a filling layer in the main cable body.

[0019] The above technical measures are based on the hexagonal concentric ring layer arrangement structure of the main cable before the cable tightening construction, and use the interlayer joints of the concentric ring layers as the arrangement space filled with the variable diameter structure. It not only meets the basic uniform filling of the main cable in the circumferential direction, but also enables the conical filling steel wire to be easily filled and arranged without basically affecting the arrangement and installation of each cable strand, and can also form a stable constraint limit for the filled steel wire to prevent loosening and falling off.

[0020] Furthermore, the filling steel wires filled in the joints between the same coils are arranged closely in sequence;

[0021] The cross section of each filling steel wire is a circular structure.

[0022] The filling steel wires of the above technical measures satisfy the basic uniform filling of the main cable in the circumferential direction, and have good free arrangement characteristics, so as to adapt to the free and dense arrangement of the filling steel wires along the full circle of the hexagonal cable strands during the main cable tightening construction.

[0023] Furthermore, each filling steel wire filled at the hanging node of the cable clamp is a slender tapered structure having a small diameter end and a large diameter end;

[0024] Corresponding to the cable clamp installation section variable diameter structure and the transition section variable diameter structure at the cable clamp installation node, the filling steel wires filled in the same inter-layer joint are divided into two groups, one group is used to fill the filling steel wires constituting the cable clamp installation section variable diameter structure, and the other group is used to fill the filling steel wires constituting the transition section variable diameter structure. The two groups of filling steel wires form a shuttle-shaped structure filling at the corresponding inter-layer joint at the cable clamp installation node in a manner that the large diameter ends are close to each other and the small diameter ends are far away from each other;

[0025] Furthermore, the length of each filling steel wire that fills and constitutes the variable diameter structure of the cable clamp installation section is greater than the length of the cable hole of the corresponding cable clamp.

[0026] The above technical measures are conducive to the easy manufacturing and forming of the filling wire of the conical structure, while meeting the requirement of the shuttle-shaped filling of the cable clamp and hanging node of the main cable, and the requirements for the forming structure accuracy of the filling wire are relatively low.

[0027] Or, further, corresponding to the variable diameter structure of the cable clamp installation section and the variable diameter structure of the transition section at the cable clamp hanging node, each filling steel wire filled at the joint between the same coils is a slender shuttle-shaped structure with small ends and a large middle part, and the tapered section of the filling steel wire at the upper side is used to fill the variable diameter structure of the cable clamp installation section, and the tapered section of the filling steel wire at the lower side is used to fill the variable diameter structure of the transition section;

[0028] Furthermore, the length of the tapered section of the filling wire that fills the variable diameter structure of the cable clamp installation section is greater than the length of the cable hole of the corresponding cable clamp.

[0029] The above technical measures, under the premise of satisfying the shuttle-shaped filling of the cable clamp hanging node of the main cable with variable diameter, achieve the construction of two opposite sections of variable diameter structure through the arrangement of filling steel wires in a shuttle-shaped structure, which is relatively conducive to simplifying the filling operation of the filling steel wire between the cable strands.

[0030] An anti-cable-clamp-slip main cable and anti-slip cable clamp assembly structure for a suspension bridge, comprising the above-mentioned main cable and cable clamp;

[0031] The half body of the cable clamp forms a tapered cable hole in the circumferential direction that matches the variable diameter structure of the cable clamp installation section at the corresponding cable clamp hanging node;

[0032] The half body of the cable clamp is circumferentially connected by a plurality of locking bolts to lock the cable clamp installation section at the corresponding cable clamp hanging node. The diameter changing direction of the tapered cable hole of the cable clamp is consistent with the diameter changing direction of the corresponding cable clamp installation section.

[0033] The assembly structure between the above-mentioned main cable and the cable clamp is based on the anti-cable clamp slippage main cable as described above, and is equipped with a cable clamp with a cable hole reducing structure, so that the tapered cable hole of the cable clamp is locked along the corresponding reducing structure cable clamp installation section on the main cable, forming a fitting relationship between the tapered sleeve and the tapered body. On the one hand, the constituent structure of the cable hole of the cable clamp (i.e., the cable clamp half) will not cause damage to the constituent steel wire of the main cable. On the other hand, the main cable is reliably embedded in the axial downward sliding of the cable clamp. This embedded pre-tightening force is intensified with the axial downward sliding of the cable clamp when the cable clamp remains in a normal locked state. In this way, the axial displacement of the cable clamp locked by the external diameter reducing structure on the main cable is embedded and cooperated with the friction force to resist the downward sliding component of the cable clamp, thereby preventing the cable clamp from slipping after loosening on the main cable due to natural working conditions and environmental factors in service, ensuring that the cable clamp forms a stable connection on the main cable, and the anti-slip technology effect is excellent.

[0034] Furthermore, the large-diameter end of the tapered cable hole of the cable clamp is provided with a flexible protective layer, and the flexible protective layer is circumferentially covered on the large-diameter end of the tapered cable hole of the cable clamp;

[0035] The large diameter end of the tapered cable hole of the cable clamp contacts the cable clamp installation section at the corresponding cable clamp hanging node with a flexible protective layer.

[0036] Furthermore, the flexible protective layer is a rubber sheath.

[0037] The above technical measures flexibly isolate the installation lower end position of the cable clamp on the main cable, so that the lower end of the cable hole of the cable clamp is in contact with the cable clamp installation section of the variable diameter structure of the main cable through the flexible protective layer, thereby avoiding possible downward sliding of the cable clamp to damage the steel wire of the main cable of the variable diameter structure.

[0038] A cabling method for the above-mentioned anti-cable clamp sliding main cable for suspension bridge, the cabling method comprising the following technical means:

[0039] Each strand with a hexagonal cross section is installed one by one in a staggered arrangement from bottom to top and left to right, starting from the bottom corner of the hexagonal cross section structure of the main cable body;

[0040] In the process of arranging and erecting each strand one by one, according to the design of corresponding filling at each cable clamping hanging node, after the strands of the corresponding filling position concentric ring layer of the main cable body complete the arrangement and erection of the current process and before being correspondingly covered by the strands of the adjacent concentric ring layer, the conical filling steel wires along the strand are closely arranged on the inner wall surface of the outer strand / the outer wall surface of the inner strand at the current position, and the filling steel wires arranged on the inner wall surface / the outer wall surface of the strand are tied and fixed;

[0041] Until the cables are installed in a staggered order from bottom to top and from left to right to form a hexagonal main cable structure, and a filling layer arranged in a tooth-shaped track is formed at the corresponding interlayer joints of the main cable body;

[0042] The main cable body is tightened to make the cross section of the main cable body circular, and is positioned and tightened by a number of circumferentially tied steel belts; each filling steel wire covered by the corresponding outer layer of cable strands is hidden inside the main cable body, and forms a tapered variable diameter structure support for the current cable clamp hanging node.

[0043] The above technical measures are based on the hexagonal concentric ring layer arrangement structure of the main cable before the cable tightening construction. According to the arrangement order of the hexagonal concentric ring layer structure during the construction process, the corresponding filling steel wires are gradually arranged on the inner wall surface of the outer cable strand according to the designed interlayer joints, so that the constructed hexagonal concentric ring layer structure forms a filling layer with an approximate tooth-shaped trajectory arrangement (due to the contour edge of the same ring layer constructed by the hexagonal cable strands) after construction. On the one hand, it can ensure that the circular structure main cable after the cable tightening construction is basically evenly filled in the annular direction, on the other hand, it forms a stable constraint limit for the filled steel wires with good integrity, and on the third hand, it is easy to construct in conjunction with the erection process of the hexagonal cable strands.

[0044] The beneficial technical effect of the present invention is: the above-mentioned technical measures are aimed at the particularity of the above-mentioned suspension bridge force structure system, and the cable clamp hanging node on the main cable (mainly refers to the cable clamp hanging node in the inclined position, and the cable clamp hanging node at the bottom of the catenary of the main cable and close to the horizontal state can be excluded) is set as a variable diameter cone structure, and the variable diameter cone structure on the main cable is used to resist the downward force of the cable clamp by combining the axial displacement embedding characteristics of the externally locked cable clamp with the friction force. When the cable clamp remains in a normal locked state, this embedding pre-tightening force increases with the axial downward sliding of the cable clamp, thereby preventing the cable clamp from slipping on the main cable after loosening due to natural working conditions and environmental factors during service, ensuring that the cable clamp forms a stable connection on the main cable, and the anti-slip technical effect is excellent. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a structural schematic diagram of the main cable of the present invention.

[0046] Figure 2 for Figure 1 A partial enlarged view of the .

[0047] Figure 3 for Figure 2 Cross-sectional view at AA.

[0048] Figure 4 for Figure 3 A partial enlarged view of the .

[0049] Figure 5 for Figure 2 and Figure 3 Schematic diagram of the filling wire structure.

[0050] Figure 6 Another structural schematic diagram of the main cable of the present invention.

[0051] Figure 7 It is a schematic diagram of the assembly structure and force analysis between the main cable and the cable clamp of the present invention.

[0052] Figure 8 for Figure 7Stereoscopic diagram.

[0053] The meaning of the codes in the figure are: 1—main cable; 11—cable strand; 12—wire filling layer; 2—filling wire; 3—cable clamp; A—main cable body; B—cable clamp hanging node; B1—cable clamp installation section; B2—slip reserved section; B3—transition section. DETAILED DESCRIPTION

[0054] The present invention relates to the technical field of suspension bridges, and in particular to a main cable with an anti-slip cable clamp for a suspension bridge, as well as an assembly structure between the main cable and the anti-slip cable clamp and a cabling method for the main cable. The main technical solution of the present invention is specifically described below in conjunction with multiple embodiments. Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 7 and Figure 8 The technical solution of the present invention is clearly and in detail explained; Example 2 is combined with the accompanying drawings of the specification - that is, Figure 6 The technical solution of the present invention is explained clearly and in detail; although other embodiments are not separately drawn with drawings, their main structures can still refer to the drawings of embodiment 1 or embodiment 2.

[0055] It should be noted that the drawings of the present invention are schematic, and unnecessary details have been simplified to clarify the technical purpose of the present invention, so as to avoid blurring the technical solution of the present invention that contributes to the prior art. In addition, the expressions "approximately", "substantially" and the like regarding quantity or matching relationship in the following text mean that reasonable assembly errors and processing errors in the industry are allowed to exist, and do not literally express absolute quantities or matching relationships.

[0056] Example 1

[0057] The anti-cable clamp slippage main cable of the present invention is installed in a suspension bridge structure in a catenary structure, and has a main cable body formed by arranging a set number of cable strands. In the structure of the suspension bridge, a plurality of cable clamps need to be arranged at intervals along the length direction on the main cable body, so as to be connected to the bridge deck below through the slings / suspenders connected to each cable clamp. Therefore, along the length direction of the main cable body, a plurality of cable clamp installation nodes arranged at intervals and used for connecting the cable clamps are preset.

[0058] See also Figure 1As shown, the cable clamps and suspension nodes B arranged at intervals along the length direction of the main cable body A are variable diameter structures in order to restrict the downward slippage of the connected cable clamps. The aforementioned variable diameter structure cable clamp suspension nodes B mainly refer to the cable clamp suspension nodes at the inclined position in the length direction of the main cable body A. As for the cable clamp suspension nodes at the bottom of the catenary of the main cable body A and close to the horizontal state (usually the connection position of the central cable clamp), they are excluded because there is basically no risk of downward slippage, and can be directly formed with the equal diameter structure of the main cable body A. It can be seen that except for the aforementioned cable clamp suspension nodes B forming the variable diameter structure, the rest of the main cable body A is no different from the conventional structure, and is basically an equal diameter structure.

[0059] See also Figure 2 As shown, according to the inclined position forming structure of the cable clamp installation node B on the main cable body, it has an inclined upper end and an inclined lower end. The cable clamp installation node B has a variable diameter structure cable clamp installation section B1 and a sliding reserved section B2 from small to large from top to bottom, and a variable diameter structure transition section B3 from large to small from top to bottom, that is, the cable clamp installation node B of the variable diameter structure forms a shuttle-shaped structure with small ends and a large middle part on the main cable body A.

[0060] The cable clamp installation section B1 is used to connect the cable clamp in the initial position. The upper end of the cable clamp installation section B1 smoothly transitions from the adjacent equal-diameter structure of the main cable body A.

[0061] The slippage reserved section B2 is located at the lower end of the cable clamp installation section B1, continuing the variable diameter cone structure of the cable clamp installation section B1 (or constituting the large diameter end of the cable clamp installation section B1 of the extended structure). The slippage reserved section B2 is used to make a clearance margin for the allowable downward sliding of the cable clamp 3 connected to the cable clamp installation section B1, which is usually not more than 10 cm. In other words, the slippage reserved section B2 is located at the lower end of the initial position of the cable clamp connected to the cable clamp installation section B1, so as to make a margin for the allowable sliding of the cable clamp on the main cable due to natural working conditions and environmental factors such as the main cable 1 being thinned by force and the weakening of the prestress of the locking bolt of the cable clamp, so that the cable clamp that slides downward is axially wedged and embedded by the slippage reserved section B2 of the cable clamp installation section B1, and it also effectively prevents the lower end of the cable clamp that slides downward from being annularly emptied.

[0062] The transition section B3 is used to integrate the cable clamp installation section B1 and the slip reserved section B2 of the variable diameter structure in the equal diameter structure of the main cable body A, so as to prevent the lower end of the slip reserved section B2 from being supported and causing a gap in the structure of the main cable body A due to the sudden increase of the structure, and also to provide reliable support and guarantee for the axial stable molding of the cable clamp installation section B1 and the slip reserved section B2 in the main cable body A. Therefore, the upper end of the transition section B3 smoothly transitions from the lower end of the slip reserved section B2, and the lower end of the transition section B3 smoothly transitions from the adjacent equal diameter structure of the main cable body A.

[0063] See also Figure 3 and Figure 4 As shown, the cable clamp with a variable diameter structure formed on the main cable body A is provided with a hanging node B, which is formed by filling the filling steel wire 2 with a conical structure at the corresponding position.

[0064] The specific filling structure is arranged as follows:

[0065] During the erection of the suspension bridge structure and before the cable tightening construction, the main cable body A is composed of 37 cable strands 11 with basically hexagonal cross sections, which are arranged in sequence to form a basic hexagonal structure with three concentric ring layers around the 19th cable strand 11, that is, 37 small hexagonal cable strands 11 form a regular large hexagonal structure according to the set arrangement rules;

[0066] At the corresponding cable clamp hanging node B on the main cable body A, in accordance with the technical requirements for the conical design of the variable diameter structure, the interlayer joints between the outer first layer and the adjacent second layer of the hexagonal concentric ring layer distribution structure, as well as the interlayer joints between the aforementioned second layer and the adjacent third layer, are filled with a plurality of conical filling steel wires 2, and the filling steel wires 2 filled in the same interlayer joints are arranged closely in sequence to form the corresponding filling layer 12 in the main cable body A at the same interlayer joints.

[0067] See also Figure 5 As shown, each of the filling steel wires 2 filled in the main cable body A has a circular elongated tapered structure in cross section, with a small diameter end and a large diameter end. In order to enable the filled variable diameter structure to smoothly transition with the equal diameter structure of the main cable body A and reduce structural mutations, the small diameter end of the filling steel wire 2 has a relatively small diameter, such as 1 cm, 2 cm, 3 cm, etc., and its taper is about 0.002, 0.003, 0.004, etc., and the specific value is determined according to the design requirements.

[0068] Since each filling steel wire 2 filled at the cable clamp installation node B is a slender tapered structure with a small diameter end and a large diameter end. In order to correspond to the reverse direction of the variable diameter structure of the cable clamp installation section B1 and the variable diameter structure of the transition section B3 at the cable clamp installation node B, the filling steel wires 2 filled at the same inter-layer joint are divided into two groups, one group is filled with each filling steel wire 2 constituting the variable diameter structure of the cable clamp installation section B1, and the other group is filled with each filling steel wire 2 constituting the variable diameter structure of the transition section B3. These two groups of filling steel wires 2 form a shuttle structure filling at the corresponding inter-layer joint of the cable clamp installation node B in a manner that the large diameter ends are close and the small diameter ends are far away. Since the sliding reserved section B2 is located at the lower end of the cable clamp installation section B1 with a continued variable diameter structure, the length of the filling steel wire 2 that fills the cable clamp installation section B1 includes the design of the sliding reserved section B2, that is, the length of each filling steel wire 2 that fills the variable diameter structure of the cable clamp installation section B1 is greater than the length of the cable hole of the cable clamp to be connected, and the extra part basically constitutes the sliding reserved section B2.

[0069] See also Figure 7 and Figure 8 As shown, the assembly structure of the anti-slip main cable 1 and the anti-slip cable clamp 3 of the above structure is that the cable clamp 3 adapted to the corresponding cable clamp hanging node B on the above main cable 1 has a tapered cable hole matching it.

[0070] Specifically, the cable clamp 3 is usually composed of two half bodies that are matched left and right or up and down and connected circumferentially. The cable hole of each half body of the cable clamp is a variable diameter structure, so that the half bodies of the cable clamp 3 form a tapered cable hole in the circumferential direction that matches the variable diameter structure of the cable clamp installation section B1 at the corresponding cable clamp installation node B.

[0071] When connected with the corresponding cable clamp installation node B on the main cable 1, the half body of the cable clamp 3 is circumferentially butted by two groups of arranged locking bolts to lock the cable clamp installation section B1 at the corresponding cable clamp installation node B, and the diameter reduction direction of the tapered cable hole of the cable clamp 3 is consistent with the diameter reduction direction of the corresponding cable clamp installation section B1. The cable clamp 3 connected in place is located on the cable clamp installation section B1 of the corresponding cable clamp installation node B, and the slip reserved section B2 at the lower end is left empty to leave a margin for the possible natural slip (small displacement) of the cable clamp 3, so that the slip reserved section B2 forms a natural wedge-tightening and embedding of the naturally slipping cable clamp 3.

[0072] Of course, in the cooperation relationship between the above-mentioned cable clamp 3 and the corresponding cable clamp installation node B on the main cable 1, the lower end of the cable hole of the cable clamp 3 needs to cooperate with the variable diameter structure cable clamp installation section B1 of the cable clamp installation node B, and there may even be a slight displacement of natural sliding. In order to prevent the natural sliding of the cable clamp 3 from causing friction damage to the steel wire of the variable diameter structure cable clamp installation section B1, an annular rubber sheath is provided at the large diameter end of the tapered cable hole of the cable clamp 3 to form a flexible protective layer structure. The flexible protective layer structure is circumferentially covered on the large diameter end of the tapered cable hole of the cable clamp 3, and the large diameter end of the tapered cable hole of the cable clamp 3 softly contacts the cable clamp installation section B1 at the corresponding cable clamp installation node B with the flexible protective layer.

[0073] The erection and forming of the above-mentioned anti-cable clamp sliding main cable is based on traditional erection technology.

[0074] For details, see Figure 3 and Figure 4 As shown in the figure (the numbering order of each cable strand 11 in the figure is determined according to the order of arrangement and installation), the cable laying method of the above-mentioned anti-cable clamp slip main cable includes the following technical means:

[0075] The 37 cables 11 with hexagonal cross sections are installed one by one in a bottom-up and left-right staggered arrangement order, starting from the bottom corner of the hexagonal cross section structure of the main cable body A (i.e., the first cable strand) (i.e., the second and third cable strands are installed at the left and right upper inclined surfaces of the first cable strand; after completion, the fourth and fifth cable strands are installed at the left and right upper inclined surfaces of the first cable strand, and the fifth and sixth cable strands are installed at the left and right upper inclined surfaces of the third cable strand; and so on);

[0076] In the process of arranging and erecting each strand 11 one by one, according to the above-mentioned design of performing corresponding filling at each cable clamping hanging node B (i.e., filling is required at the interlayer joint between the outer first layer and the adjacent second layer, and filling is also required at the interlayer joint between the outer second layer and the adjacent third layer), for the lower half of the hexagonal cross section, after the arrangement and erection of the strands 11 constituting the outer first layer of the main cable body A (i.e., the first strand, the second strand, and the third strand) are completed and before being arranged and covered by the strands 11 constituting the inner second layer (i.e., the fifth strand), the inner wall surface of the corresponding strand 11 (i.e., the top side edge of the first strand, the top side edge and the upper right side edge of the second strand, the top side edge and the upper left side edge of the third strand; of course, the second strand) is filled. The top side of the first strand and the top side of the third strand are not in a hurry to be covered and can be temporarily delayed) and the conical filling steel wires 2 arranged along the current strand 11 are respectively arranged closely, and the filling steel wires 2 arranged on the inner wall of the current strand 11 are tied and fixed by wrapping with adhesive tape, and so on; until the lower half of the hexagonal section is arranged and erected, the arrangement and erection of the upper half of the hexagonal section begins. At this time, before the inner third layer of the main cable body A constituting the strand 11 and / or the second layer of the strand 11 are arranged and covered, the conical filling steel wires 2 along the current strand 11 are respectively arranged closely on the outer wall of the corresponding strand 11, and the filling steel wires 2 arranged on the outer wall of the current strand 11 are tied and fixed by wrapping with adhesive tape, and so on;

[0077] Until the cables 11 are arranged in a staggered order from bottom to top and from left to right, a hexagonal main cable body A structure with three concentric ring layers centered on the 19th cable strand is formed, and a filling layer 12 arranged in a tooth-shaped track is formed around the corresponding interlayer joints of the main cable body A;

[0078] As the bridge construction project progresses, the main cable body A is tightened so that the cross-section of the main cable body A changes from a hexagon to a circle, and is positioned and tightened by a number of circumferentially bundled steel belts arranged at intervals along the length direction of the main cable body A; each filling steel wire 2 covered by the corresponding outer layer of cable strands 11 is hidden inside the main cable body A, and no requirements are made on its circumferential arrangement position, so that the filled filling steel wires 2 form a tapered variable diameter structure support for the current cable clamp suspension node B.

[0079] See also Figure 7 As shown, the assembly structure between the anti-slip main cable 1 and the anti-slip cable clamp 3 is based on the following force technology principle.

[0080] The inner diameter of the upper end of the cable hole of the cable clamp 3 is set to D, and the diameter of the lower end of the cable hole is set to D+ΔD.

[0081] Taking the 1.5m long cable clamp 3 as an example, when ΔD is selected as 200mm, according to calculation, the diffusion angle generated is:

[0082]

[0083] When the slippage of the cable clamp 3 reaches 15 mm, the diameter increases to:

[0084]

[0085] The technical requirement that the elastic elongation of the locking bolt of the cable clamp 3 is only 1 to 2 mm can be fully met.

[0086] According to the balance condition of sliding force:

[0087] N·Sinθ+μN·cosθ=F·Sinα;

[0088] Wherein, N is the pressure on the contact surface between the cable clamp 3 and the main cable 1;

[0089] F is the downward force on the cable clamp 3;

[0090] Sinθ=0.066, μ=0.15, cosθ=1;

[0091] Substitute into the formula:

[0092] N·0.066+0.15·N=F·sinα;

[0093] The first item N·0.066 is the embedding force of the contact surface;

[0094] The latter term, 0.15·N, is the friction force of the contact surface;

[0095] The ratio of the two is 0.066 / 0.15=0.44, indicating that about 30% of the sliding force is borne by the embedding force, and the friction force is reduced to 70% of the original. If the diffusion angle is further increased, the proportion of friction force can be further reduced. For example, when 2θ=16 0 , the embedding force and the friction force are equal, each accounting for 50%.

[0096] In addition, when there is a serious loss of pressure N value on the contact surface between the cable clamp 3 and the main cable 1, when the cable clamp 3 slides down along the diffused slope, due to the squeezing effect of the conical bell mouth, as the diameter increases, the pressure N value of the contact surface will increase rapidly, and after a slight slip (15mm), it can be balanced with F again, and the slip will stop immediately and be suppressed. The anti-cable clamp slip technology has excellent effect.

[0097] Example 2

[0098] The other contents of this embodiment are the same as those of Embodiment 1, except that:

[0099] See also Figure 6 As shown, there are 91 strands constituting the main cable body, which form a five-layer concentric ring distribution structure with the 46th strand as the center;

[0100] Starting from the outside, filling layers of conical filling steel wires are distributed and formed at the interlayer joints of the first layer and the second layer, the interlayer joints of the second layer and the third layer, the interlayer joints of the third layer and the fourth layer, and the interlayer joints of the fourth layer and the fifth layer.

[0101] Example 3

[0102] The other contents of this embodiment are the same as those of Embodiment 1 or Embodiment 2, except that:

[0103] Corresponding to the reducing structure of the cable clamp installation section and the reducing structure of the transition section at the cable clamp hanging node, each filling steel wire filled at the joint between the same circle layers is a slender shuttle-shaped structure with small ends and a large middle part, and the tapered section of the filling steel wire at the upper side is used to fill the reducing structure of the cable clamp installation section, and the tapered section of the filling steel wire at the lower side is used to fill the reducing structure of the transition section; and the length of the tapered section of the filling steel wire that fills the reducing structure of the cable clamp installation section is greater than the length of the cable hole of the corresponding cable clamp.

[0104] The above embodiments are only used to illustrate the present invention, but not to limit it.

[0105] Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the above embodiments may still be modified, or some of the technical features may be replaced by equivalents. For example, there is no restriction on the number of strands in the concentric ring layers constituting the main cable body, as long as they form a hexagon. Another example is that only the joints between the corresponding circles of the concentric ring layers may be filled according to the calculation requirements of the designed variable diameter structure. For example, no special requirements are made on the conical structural parameters of the filling steel wire, etc. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the present invention.

Claims

1. A main cable with an anti-cable clamp for a suspension bridge, comprising a main cable body (A) erected in a suspension bridge structure in a catenary structure; Along the length direction of the main cable body (A), a plurality of cable clamp hanging nodes (B) arranged at intervals are preset; Features: Each cable clamp hanging node (B) has a cable clamp installation section (B1) with a variable diameter structure that increases from small to large from top to bottom, and the cable clamp installation section (B1) is used to connect the cable clamp (3); The upper end of the cable clamp installation section (B1) smoothly transitions from the equal-diameter structure of the main cable body (A).

2. The anti-slip main cable clamp for suspension bridge according to claim 1, characterized in that: The cable clamp hanging node (B) comprises a sliding reserved section (B2) located at the lower end of the cable clamp installation section (B1) and continuing the variable diameter structure of the cable clamp installation section (B1); The sliding reserved section (B2) is used to leave a margin for the sliding of the cable clamp (3) connected to the cable clamp installation section (B1).

3. The anti-slip main cable clamp for suspension bridge according to claim 2, characterized in that: The cable clamp hanging node (B) has a variable diameter structural transition section (B3) that changes from large to small from top to bottom; The upper end of the transition section (B3) smoothly transitions from the lower end of the slip reserved section (B2), and the lower end of the transition section (B3) smoothly transitions in the equal-diameter structure of the main cable body (A).

4. The anti-cable clamp for suspension bridge according to claim 1, 2 or 3, characterized in that: Before the cable tightening construction, the main cable body (A) is composed of a plurality of hexagonal cable strands (11) arranged in sequence to form a hexagonal structure with concentric ring layers in cross section; At each cable clamp suspension node (B) on the main cable body (A), a plurality of conical filling steel wires (2) are filled at the junction between at least one of the concentric ring layers, and the filling steel wires (2) filled at the junction between the same ring layers constitute a filling layer (12) inside the main cable body (A).

5. The anti-slip main cable clamp for suspension bridge according to claim 4, characterized in that: The filling steel wires (2) filled in the joints between the same coils are arranged closely in sequence; The cross section of each filling steel wire (2) is a circular structure.

6. The anti-slip main cable clamp for suspension bridge according to claim 4, characterized in that: Each filling steel wire (2) filled at the cable clamp hanging node (B) is a slender tapered structure having a small diameter end and a large diameter end; Corresponding to the variable diameter structure of the cable clamp installation section (B1) and the variable diameter structure of the transition section (B3) at the cable clamp installation hanging node (B), the filling steel wires (2) filled at the same inter-layer joint are divided into two groups, one group is composed of the filling steel wires (2) that fill the variable diameter structure of the cable clamp installation section (B1), and the other group is composed of the filling steel wires (2) that fill the variable diameter structure of the transition section (B3). The two groups of filling steel wires (2) are filled in the corresponding inter-layer joint at the cable clamp installation hanging node (B) in a manner that the large diameter ends are close to each other and the small diameter ends are far away from each other to form a shuttle-shaped structure; Furthermore, the length of each filling steel wire (2) that fills and forms the variable diameter structure of the cable clamp installation section (B1) is greater than the length of the cable hole of the corresponding cable clamp (3).

7. The anti-slip main cable clamp for suspension bridge according to claim 4, characterized in that: Corresponding to the variable diameter structure of the cable clamp installation section (B1) and the variable diameter structure of the transition section (B3) at the cable clamp suspension node (B), each filling steel wire (2) filled at the joint between the same coil layers is a slender shuttle-shaped structure with small ends and a large middle part, and the tapered section of the filling steel wire (2) at the upper side is used to fill the variable diameter structure of the cable clamp installation section (B1), and the tapered section of the filling steel wire (2) at the lower side is used to fill the variable diameter structure of the transition section (B3); Furthermore, the length of the tapered section of the filling steel wire (2) that fills and forms the variable diameter structure of the cable clamp installation section (B1) is greater than the length of the cable hole of the corresponding cable clamp (3).

8. An anti-cable clamp sliding main cable and anti-slip cable clamp assembly structure for a suspension bridge, characterized in that: Comprising the main cable (1) and the cable clamp (3) according to any one of claims 1 to 7; The half body of the cable clamp (3) forms a tapered cable hole in the circumferential direction that matches the variable diameter structure of the cable clamp installation section (B1) at the corresponding cable clamp installation node (B); The constituent halves of the cable clamp (3) are circumferentially butted together by a plurality of locking bolts to lock and embrace the cable clamp installation section (B1) at the corresponding cable clamp installation node (B), and the diameter reduction direction of the tapered cable hole of the cable clamp (3) is consistent with the diameter reduction direction of the corresponding cable clamp installation section (B1).

9. The anti-cable clamp sliding main cable and anti-slip cable clamp assembly structure for suspension bridge according to claim 8, characterized in that: The large-diameter end of the tapered cable hole of the cable clamp (3) is provided with a flexible protective layer, and the flexible protective layer circumferentially covers the large-diameter end of the tapered cable hole of the cable clamp (3); The large diameter end of the tapered cable hole of the cable clamp (3) contacts the cable clamp installation section (B1) at the corresponding cable clamp hanging node (B) with a flexible protective layer.

10. A method for laying a cable of a main cable with an anti-cable clamp for a suspension bridge according to any one of claims 1 to 7, characterized in that: The cabling method includes the following technical means: Each strand with a hexagonal cross section is installed one by one in a staggered arrangement from bottom to top and left to right, starting from the bottom corner of the hexagonal cross section structure of the main cable body; In the process of arranging and erecting each strand one by one, according to the design of corresponding filling at each cable clamping hanging node, after the strands of the corresponding filling position concentric ring layer of the main cable body complete the arrangement and erection of the current process and before being correspondingly covered by the strands of the adjacent concentric ring layer, the conical filling steel wires along the strand are closely arranged on the inner wall surface of the outer strand / the outer wall surface of the inner strand at the current position, and the filling steel wires arranged on the inner wall surface / the outer wall surface of the strand are tied and fixed; Until the cables are installed in a staggered order from bottom to top and from left to right to form a hexagonal main cable structure, and a filling layer arranged in a tooth-shaped track is formed at the corresponding interlayer joints of the main cable body; The main cable body is tightened to make the cross section of the main cable body circular, and is positioned and tightened by a number of circumferentially tied steel belts; each filling steel wire covered by the corresponding outer layer of cable strands is hidden inside the main cable body, and forms a tapered variable diameter structure support for the current cable clamp hanging node.

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