A type of anti-slip cable saddle for suspension bridges

Abstract

This invention discloses an anti-slip cable saddle for suspension bridges, relating to the field of suspension bridge structural technology. The saddle includes: a base plate for mounting on the top of a tower column; a support mechanism mounted on the base plate; and two saddle grooves, both mounted on the support mechanism. The two ends of the two saddle grooves are connected correspondingly, and the middle portions of the two saddle grooves protrude in a direction away from each other, with a smooth transition between the ends and the middle portions. The main cable, in addition to generating friction with the bottom of the saddle grooves, also generates friction with the sidewalls of the protruding portions in the direction away from each other, increasing the friction between the main cable and the saddle grooves and improving the anti-slip performance of the cable saddle. This invention solves the problems of existing technologies that use zinc coatings or high-strength tensioning bolts to increase friction, resulting in limited friction improvement or low durability and reliability.

Description

Technical Field

[0001] This invention relates to the field of suspension bridge structure technology, and specifically to an anti-slip cable saddle for suspension bridges. Background Technology

[0002] Multi-tower suspension bridges, with their multiple large-span main spans, reduce the number of piers in the water, making them particularly suitable for large rivers and sea-crossing bridges with wide water surfaces, such as the Ma'anshan Highway Yangtze River Bridge and the Taizhou Highway Yangtze River Bridge. The cable saddle of a suspension bridge is a connecting structure located at the top of the main tower, linking the main cable and the tower. The main cable transmits vertical force to the main tower as pressure through the saddle groove, and transmits unbalanced horizontal force to the main tower as friction between the main cable and the inner wall of the saddle groove. To ensure the smooth transmission of unbalanced horizontal force, the main cable must not slip within the saddle groove. Because the middle tower of a multi-tower suspension bridge lacks the anchoring effect of the side span main cables, the unbalanced horizontal force on the main cable at the top of the middle tower is very large under unilateral loading. The anti-slip design of the middle tower cable saddle is often a key point in controlling the design of multi-tower suspension bridges.

[0003] In existing technologies, increasing the coefficient of friction by adding a zinc layer or increasing friction by tensioning a high-strength screw has the problem of limited increase in friction or low durability and reliability. Summary of the Invention

[0004] In view of the defects in the existing technology, the purpose of the present invention is to provide a suspension bridge anti-slip cable saddle that can solve the problems of limited friction increase or low durability and reliability in the existing technology, which uses the addition of zinc layer to increase the friction coefficient or tensioning high-strength screws to increase friction.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0006] This solution provides an anti-slip cable saddle for suspension bridges, including:

[0007] The base plate is used to be installed on the top of the tower column;

[0008] A support mechanism is mounted on the base plate;

[0009] Two saddle grooves are provided on the support mechanism. The two ends of the two saddle grooves are connected to each other. The middle of the two saddle grooves protrudes in a direction away from each other, and the ends and middle of the saddle grooves are smoothly transitioned.

[0010] In some alternative schemes, the center line of the horizontal projection of the saddle groove is three tangentially connected arcs.

[0011] In some alternative designs, the saddle groove arches away from the base plate.

[0012] In some alternative solutions, the radius of the arc of the horizontal projection and the radius of the arc of the side projection of the saddle groove are determined according to the anti-slip safety factor requirements of the saddle.

[0013] In some alternative solutions, according to the formula: Determine the radius of the arc of the horizontal projection and the radius of the arc of the side projection of the saddle groove;

[0014] Where k is the anti-skid safety factor, R v R is the radius of the arc in the side projection. h Let α be the radius of the horizontally projected arc, μ be the coefficient of friction, and α be the radius of the arc. v T1 is the vertical wrap angle of the cable saddle, T2 is the cable force on the side with the larger cable force of the main cable, and T1 is the cable force on the side with the smaller cable force of the main cable.

[0015] In some alternative solutions, multiple connecting plates are spaced apart along the length of the saddle grooves between the middle portions of the two saddle grooves.

[0016] In some alternative embodiments, the bottom of the saddle groove is stepped, and the stepped platform closer to another saddle groove is lower than the stepped platform farther away from another saddle groove.

[0017] In some alternative solutions, the support mechanism includes two support plates, which are respectively arranged along the length of the two saddle grooves and support the saddle grooves. The distance between the two support plates and the end connected to the saddle groove is smaller than the distance between the two end connected to the bottom plate.

[0018] In some alternative solutions, multiple external stiffening ribs are provided at intervals along the length of the saddle groove between the outer side of the support plate and the bottom of the saddle groove.

[0019] In some alternative solutions, multiple internal stiffening plates are spaced apart along the length of the inner sides of the two support plates.

[0020] Compared with the prior art, the advantages of this invention are as follows: This solution provides a support mechanism on the base plate at the top of the tower column, and a saddle groove is provided on the support mechanism. When the main cable is placed in the saddle groove, since the two ends of the two saddle grooves are connected correspondingly, the middle of the two saddle grooves protrudes in a direction away from each other, and the ends of the saddle grooves smoothly transition to the middle. In addition to generating friction with the bottom of the saddle groove, the main cable also generates friction with the sidewall of the protruding part in the middle direction away from each other, increasing the friction between the main cable and the saddle groove and improving the anti-slip performance of the cable saddle. This solves the problem in the prior art where increasing the friction coefficient by adding a zinc layer or tensioning a high-strength screw results in limited friction improvement or low durability and reliability. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a top view schematic diagram of the anti-slip cable saddle of the suspension bridge in an embodiment of the present invention;

[0023] Figure 2 This is a cross-sectional view of the anti-slip cable saddle of the suspension bridge in an embodiment of the present invention;

[0024] Figure 3 This is a schematic elevation projection of the anti-slip cable saddle of the suspension bridge in an embodiment of the present invention;

[0025] Figure 4 As described in the embodiments of the present invention, along Figure 3 A cross-sectional schematic diagram of AA in the middle;

[0026] Figure 5 As described in the embodiments of the present invention, along Figure 3 Cross-sectional schematic diagram of BB;

[0027] Figure 6 This is a schematic diagram illustrating the calculation parameters for the facade projection viewpoint in an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram illustrating the calculation parameters of the top-view perspective in an embodiment of the present invention;

[0029] In the diagram: 1. Base plate; 2. Support mechanism; 21. Support plate; 3. Saddle groove; 4. Connecting plate; 5. External stiffening rib; 6. Internal stiffening plate; 7. Construction hole. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] The embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0032] like Figure 1 and Figure 2 As shown, the present invention provides an anti-slip cable saddle for suspension bridges, comprising:

[0033] Base plate 1, which is used to be installed on the top of the tower column;

[0034] Support mechanism 2 is mounted on base plate 1;

[0035] Two saddle grooves 3 are both set on the support mechanism 2. The two ends of the two saddle grooves 3 are connected to each other. The middle of the two saddle grooves 3 protrudes in a direction away from each other, and the ends and middle of the saddle grooves 3 are smoothly transitioned.

[0036] In this embodiment, a support mechanism 2 is installed on the base plate 1 at the top of the tower column, and a saddle groove 3 is installed on the support mechanism 2. When the main cable is installed in the saddle groove 3, since the two ends of the two saddle grooves 3 are connected correspondingly, the middle of the two saddle grooves 3 protrudes in a direction away from each other, and the ends of the saddle grooves 3 smoothly transition to the middle. In addition to generating friction with the bottom of the saddle groove 3, the main cable also generates friction with the sidewall of the protruding part in the middle direction away from each other, which increases the friction between the main cable and the saddle groove 3 and improves the anti-slip performance of the cable saddle. This solves the problem in the prior art that using an additional zinc layer to increase the friction coefficient or tensioning a high-strength screw to increase friction results in limited friction increase or low durability and reliability.

[0037] like Figure 1 As shown, in some optional embodiments, the center line of the horizontal projection of the saddle groove 3 is three tangentially connected arcs.

[0038] In this embodiment, the shape of the two saddle grooves 3 protruding in the middle towards each other is an arc, and the ends of the saddle grooves 3 are smoothly transitioned to the middle by the two end arcs that are tangent to the two ends of the arc.

[0039] like Figure 3 As shown, in some alternative embodiments, the saddle groove 3 arches away from the base plate 1.

[0040] In this embodiment, the saddle groove 3 arches away from the base plate 1, so that its vertical projection is an arc shape, which makes it easier for both ends of the main cable to go downward along the two ends of the saddle groove 3, and avoids the saddle groove 3 from scratching the main cable.

[0041] like Figure 6 and Figure 7 As shown, in some optional embodiments, the radius of the arc of the horizontal projection and the radius of the arc of the side projection of the saddle groove 3 are determined according to the anti-slip safety factor requirements of the cable saddle.

[0042] In this embodiment, when designing the radius of the arc segment of the cable saddle, the arc radius of the horizontal projection and the arc radius of the side projection of the saddle groove 3 are determined according to the anti-slip safety factor requirements of the cable saddle.

[0043] In some alternative embodiments, according to the formula: Determine the radius of the arc of the horizontal projection and the radius of the arc of the side projection of saddle groove 3;

[0044] Where k is the anti-skid safety factor, R v R is the radius of the arc in the side projection. h Let α be the radius of the horizontally projected arc, μ be the coefficient of friction, and α be the radius of the arc. v T1 is the vertical wrap angle of the cable saddle, T2 is the cable force on the side with the larger cable force of the main cable, and T1 is the cable force on the side with the smaller cable force of the main cable.

[0045] In some optional embodiments, a plurality of connecting plates 4 are provided at intervals along the length of the saddle groove 3 between the middle of the two saddle grooves 3.

[0046] In this embodiment, multiple connecting plates 4 are spaced apart along the length of the saddle groove 3 between the middle of the two saddle grooves 3 to increase the connection strength between the two saddle grooves 3.

[0047] like Figure 4 and Figure 5 As shown, in some optional embodiments, the bottom of the saddle groove 3 is stepped, and the stepped platform near another saddle groove 3 is lower than the stepped platform away from another saddle groove 3.

[0048] In this embodiment, the main cable includes multiple thin cables tied together, and the saddle groove with a 3-step trapezoidal bottom can increase the contact area between the main cable and the bottom of the groove, thereby increasing the friction.

[0049] In some optional embodiments, the support mechanism 2 includes two support plates 21, which are respectively arranged along the length of the two saddle grooves 3 and support the saddle grooves 3. The distance between the two support plates 21 and the end connected to the saddle groove 3 is smaller than the distance between the two support plates 21 and the end connected to the bottom plate 1.

[0050] In this embodiment, the two saddle grooves 3 are supported by two support plates 21 respectively, resulting in a better stress structure and improved overall stability.

[0051] In some optional embodiments, a plurality of external stiffening ribs 5 are provided at intervals along the length of the saddle groove 3 between the outer side of the support plate 21 and the bottom of the saddle groove 3.

[0052] In this embodiment, by providing multiple external stiffening ribs 5 at intervals along the length of the saddle groove 3 between the outer side of the support plate 21 and the bottom of the saddle groove 3, the structural strength of the support mechanism 2 is increased and the system stability is improved.

[0053] In some alternative embodiments, a plurality of inner stiffening plates 6 are provided at intervals along the length direction on the inner sides of the two support plates 21.

[0054] In this embodiment, by providing multiple inner stiffening plates 6 at intervals along the length direction on the inner side of the two support plates 21, the structural strength of the support mechanism 2 is increased and the system stability is improved.

[0055] In some alternative embodiments, the inner stiffening plate 6 is provided with construction holes 7.

[0056] In this embodiment, a construction hole 7 is provided on the inner stiffening plate 6, through which construction personnel can pass to facilitate the construction of the cable saddle.

[0057] In specific examples, to prevent excessive bending stress from the main cable bending, the saddle radius is 8 to 12 times the main cable diameter. In the prior art, with a saddle vertical radius of 12 times the main cable diameter, the maximum cable force on one side of the main cable is 729,940 kN, and the minimum cable force on the other side is 637,196 kN. The saddle vertical wrap angle is 0.8457 rad, and the friction coefficient μ is 0.2. Therefore, the anti-slip safety factor of the prior art saddle is 1.21. In this embodiment of the invention, a horizontal arc is added to the saddle, and the horizontal radius of the saddle is 8 times the main cable diameter D. Therefore, the saddle oblique wrap angle is 1.5246 rad, and the anti-slip safety factor is 2.18. Compared to the saddle in the prior art, the anti-slip safety factor of the saddle provided by the present invention is increased by 1.8 times.

[0058] In summary, the anti-slip cable saddle provided by this invention increases the wrap angle between the cable saddle and the main cable, thereby improving the friction between the main cable and the cable saddle. The horizontal radial forces generated by the two saddle grooves 3 protruding in opposite directions can cancel each other out, with only the vertical force transmitted to the bridge tower, resulting in a stable and reliable structure.

[0059] In the description of this application, it should be noted that the terms "upper," "lower," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0060] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover 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 limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0061] The above description is merely a specific embodiment of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A suspension bridge anti-slip cable saddle, characterized in that, include: The base plate (1) is used to be installed on the top of the tower column; Support mechanism (2), which is mounted on the base plate (1); Two saddle grooves (3) are both provided on the support mechanism (2); the two ends of the two saddle grooves (3) are connected to each other, the middle of the two saddle grooves (3) protrudes in a direction away from each other, and the end of the saddle groove (3) is smoothly connected to the middle; the horizontal radial force generated by the two saddle grooves (3) protruding in a direction away from each other can cancel each other out, and the structure is stable and reliable. The center line of the horizontal projection of the saddle groove (3) is three tangentially connected arcs; The saddle groove (3) arches away from the bottom plate (1); According to the formula: Determine the radius of the arc of the horizontal projection and the radius of the arc of the side projection of the saddle groove (3); in, To ensure a safe anti-slip factor, Let be the radius of the arc in the side projection. Let the radius of the arc be the horizontal projection. The coefficient of friction, For the vertical wrap angle of the cable saddle, The main cable force on the side with greater main cable force. The main cable force on the side with smaller main cable force; The bottom of the saddle groove (3) is stepped, and the stepped platform near the other saddle groove (3) is lower than the stepped platform away from the other saddle groove (3).

2. The anti-slip cable saddle for suspension bridges as described in claim 1, characterized in that, Multiple connecting plates (4) are provided at intervals along the length of the saddle groove (3) between the middle parts of the two saddle grooves (3).

3. The anti-slip cable saddle for suspension bridges as described in claim 1, characterized in that, The support mechanism (2) includes two support plates (21). The two support plates (21) are respectively arranged along the length direction of the two saddle grooves (3) and support the saddle grooves (3). The distance between the two support plates (21) and the end connected to the saddle groove (3) is less than the distance between the two support plates (21) and the end connected to the bottom plate (1).

4. The anti-slip cable saddle for suspension bridges as described in claim 3, characterized in that, Between the outer side of the support plate (21) and the bottom of the saddle groove (3), a plurality of external stiffening ribs (5) are provided at intervals along the length direction of the saddle groove (3).

5. The anti-slip cable saddle for suspension bridges as described in claim 3, characterized in that, Multiple inner stiffening plates (6) are provided at intervals along the length direction on the inner side of the two support plates (21).

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