Space cable suspension bridge main cable anti-sliding shaping device and installation method

Abstract

The invention discloses an anti-skid shaping device for a main cable of a space cable suspension bridge and an installation method. The device comprises a clamping assembly, a pull rod assembly, a lateral anchoring assembly and a cable strand partition plate. According to the device, the clamping assembly is installed between the lateral anchoring assemblies through the bolts, a pull rod of the pull rod assembly penetrates through the two ends of the clamping assembly and is locked through the locking nuts, a stable structure is formed, torque is applied to the locking nuts, pretightening force is applied to the clamping assembly, and a main cable strand is clamped; the periphery of the interior of the lateral anchoring assembly is completely attached to the main cable strand, so that the lateral anchoring assembly is anchored to the main cable, and a rubber pad is arranged in the lateral anchoring assembly to improve the friction coefficient between the device and the main cable. The cable strand partition plates are filled in gaps of the cable strands, so that the strand wires are prevented from being bent and deformed in the pre-tightening force applying process. According to the device, all assemblies are installed at the outlet of the main cable saddle for cooperative work, the additional anti-sliding capacity is provided, the anti-sliding capacity of the main cable is remarkably improved, meanwhile, the shape of the main cable at the outlet of the cable saddle is limited, and the construction safety of the suspension bridge is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of suspension bridge construction, and more specifically, relates to a main cable anchoring anti-slip device for a space cable suspension bridge and an installation method thereof. Background Art

[0002] As a structural form that occupies an important position in bridge engineering, suspension bridges are widely used in the construction of large-span bridges due to their excellent spanning capacity. Among them, the space cable suspension bridge, as a unique branch of the suspension bridge, is characterized by the fact that the main cable is no longer limited to the traditional two-dimensional plane layout, but presents a more complex and changeable shape in three-dimensional space. This design not only enhances the overall aesthetic effect of the bridge, but more importantly, through the reasonable layout of three-dimensional space, it effectively improves the structural stability and bearing capacity of the bridge. As the main load-bearing component of the suspension bridge, the anti-slip performance and shape of the main cable are crucial to the stress performance and stability of the bridge. Therefore, during the construction process, a series of scientific and effective measures are taken to ensure the stable and reliable anti-slip performance of the main cable, while accurately controlling its shape, which has become the key to ensuring the quality and safety of the construction of the space cable suspension bridge. The prior art, such as the patent document number CN201910817700.2, provides a main cable construction auxiliary device and a main cable construction method for a space cable suspension bridge. The device includes a space cable fixing bracket and a main cable strand temporary fixing device; wherein the space cable fixing bracket is provided with a transverse support and two longitudinal supports, the top end of the longitudinal support is connected to the transverse support to form a trapezoid, and the bottom end of the longitudinal support is connected to the main bridge steel box girder; the longitudinal support is in the empty cable design plane of the main cable; the main cable strand temporary fixing device is arranged on the upper part of both sides of the space cable fixing bracket, and the main cable strand temporary fixing device includes an outer sleeve, a plurality of positioning cable clamps and a connecting The plate, the main cable strands pass through the positioning cable clamps, and the adjacent positioning cable clamps are spliced ​​with each other in the same plane; the adjacent positioning cable clamps are connected to each other through the connecting plate; it can effectively prevent the main cable from twisting; avoid the phenomenon of wire drumming during the installation of the main cable, resulting in uneven force inside and outside, and reducing the safety reserve of the main cable; it can avoid the phenomenon that the space sling cannot enter the hole or the other cables are not perpendicular to the anchoring surface, so as to effectively fix the main cable strands to prevent them from twisting and drumming, and facilitate the adjustment of the main cable to the designed line shape, without the need to position the cable clamps, enter the cable holes or align with the beam end plates, solve the problem of twisting and uneven force of the main cable of the space cable suspension bridge, and completely solve the problem that the installation errors of the suspenders and cable clamps affect the structural safety and durability. However, the device of the invention has a complex structure, and the installation operation is inconvenient. It cannot solve the problems of main cable sliding and twisting, drumming, deformation, etc. at the same time, which affects the construction efficiency. Summary of the invention

[0003] In view of the above defects or improvement needs of the prior art, the present invention provides an anti-skid shaping device and installation method for the main cable of a space cable suspension bridge, wherein torque is applied to the clamping assembly through a pull rod assembly to apply a pre-tightening force to clamp the cable strands, so that the inner four sides of the lateral anchoring assembly are completely in contact with the main cable strands, thereby anchoring with the main cable, improving the anti-skid ability between the saddle and the main cable, and solving the problem of relative sliding between the main cable and the saddle during the hoisting of the main beam of a multi-span space cable suspension bridge in the prior art. At the same time, the shape of the main cable at the saddle outlet is limited, ensuring the torsion and bulging of the main cable caused by different changes in the main cable of the space cable structure in the transverse direction and along the elevation direction during the beam hoisting process, thereby improving the integrity of the main cable.

[0004] In order to achieve the above-mentioned object, according to one aspect of the present invention, the present invention provides a main cable anti-slip shaping device for a space cable suspension bridge, comprising: a clamping assembly, a pull rod assembly, a lateral anchoring assembly and a cable strand partition, wherein:

[0005] The pull rod assembly includes a pull rod and a locking nut, which are used to apply a pre-tightening force;

[0006] The clamping assembly is installed between the lateral anchoring assemblies and connected by bolts. It is made of I-shaped steel plates, allowing the pull rod to pass through and is locked and connected by the locking nut, and is used to withstand the preload applied by the pull rod assembly;

[0007] The lateral anchoring assembly is an irregular steel plate, which is processed and manufactured according to the cross-sectional dimensions of the main cable at the saddle outlet, installed on both sides of the main cable at the saddle outlet, and is tightly fitted and anchored with the main cable under the action of the pre-tightening force;

[0008] The cable strand partition is installed in the gap between the main cable strands at the saddle outlet to prevent the strands from being squeezed and bent when the pre-tightening force is applied;

[0009] The pull rod passes through the inside of the clamping assembly, and the locking nuts are installed at both ends. The pre-tightening force is applied to the clamping assembly by slowly and evenly applying torque to the locking nuts to clamp the cable strands, so that the inside of the lateral anchoring assembly and the main cable strands are completely fitted together, thereby being anchored to the main cable. The pre-tightening force is adjusted by establishing a calculation model of the fit, the bending deformation of the strands and the pre-tightening force.

[0010] Furthermore, the preload force calculation steps are as follows:

[0011] Step 1: Analyze the contact pressure and fit between the main cable and the lateral anchor assembly, and calculate the tight fit factor;

[0012] Step 2: Accurately calculate the friction force through the friction coefficient function that depends on the contact pressure, ensure that the total friction force is greater than or equal to the sum of all external forces that may cause sliding to prevent slipping, and obtain the anti-slip force;

[0013] Step 3: Based on the friction requirements, calculate the minimum value of the preload force to ensure that it can provide sufficient friction to prevent the main cable from slipping.

[0014] Step 4: Considering the maximum allowable stress of each strand and the safety margin of plastic deformation, limit the average stress of each strand to not exceed its yield strength minus the safety margin;

[0015] Step 5: Comprehensively optimize the preload: Combine the tight fit and strand stress limit conditions to derive the final preload adjustment formula to ensure that the lateral anchor assembly fits tightly to the main cable and prevent the strands from being over-compressed and causing bending deformation.

[0016] Furthermore, a reserved hole for passing the pull rod is opened in the middle of the flange of the clamping assembly.

[0017] Furthermore, the web of the clamping assembly is provided with a first bolt hole.

[0018] Furthermore, a second bolt hole matching the first bolt hole on the web of the clamping assembly is provided on the plate surface of the lateral anchoring assembly, and is used for passing bolts to connect the clamping assembly and the lateral anchoring assembly.

[0019] Furthermore, the diameters of the first bolt hole and the second bolt hole are larger than the diameters of the bolts passing through them, allowing the clamping assembly to generate a slight displacement in a direction close to the main cable strand when subjected to a pre-tightening force.

[0020] Furthermore, the pull rod is provided with a thread for the locking nut to rotate and move thereon to apply torque.

[0021] Furthermore, the edges of the cable strand separators are specially processed and polished into smooth curved surfaces.

[0022] Furthermore, it also includes a rubber pad, which is arranged between the lateral anchoring assembly and the main cable strand to increase friction.

[0023] According to another aspect of the present invention, the present invention provides a method for installing an anti-slip shaping device for a main cable of a space cable suspension bridge, which is implemented by applying the above-mentioned anti-slip shaping device for a main cable of a space cable suspension bridge, and is characterized in that it includes the following specific steps:

[0024] S100: Arrange the cable strands at the saddle outlet to ensure that the surface of the cable strands is flat and there is no wire twisting. Clean the surface of the cable strands to remove any debris or dirt that may exist, so as to ensure that the contact surface is clean and flat when the components are installed.

[0025] S200: Install the strand spacer in the gap between the strands at the saddle exit. When installing, make sure that the strand spacer is flush with the top and bottom of the main cable strand.

[0026] S300: Place a 3mm thick rubber pad inside the lateral anchor assembly, install the lateral anchor assemblies symmetrically on the left and right sides and temporarily fix them. For each saddle outlet, a total of four lateral anchor assemblies need to be installed, and a clamping assembly is installed between two lateral anchor assemblies on the same side and fixed by bolts;

[0027] S400: Fine-tune the position of the lateral anchor assembly to ensure that it is in direct contact and fit with the saddle outlet, and fix the lateral anchor assembly;

[0028] S500: Pass the tie rod through the reserved hole on the flange of the clamping assembly and lock it with lock nuts at both ends;

[0029] S600: According to the calculated tension, torque is applied to the locking nut to generate pre-tightening force on the clamping assembly to clamp the main cable strand. During the process, the pre-tightening force is adjusted according to the pre-tightening force calculation model so that the inner periphery of the lateral anchoring assembly is completely fitted with the main cable strand so as to be anchored with the main cable, thereby completing the installation of the entire device.

[0030] Furthermore, it also includes that when fine-tuning the position of the lateral anchor assembly, if there is a gap between it and the saddle outlet, it is filled with wooden strips or rubber pads until it fits perfectly; when the preload force is applied, if new gaps appear between the saddle and the lateral anchor assembly, thin rubber pads are inserted into these gaps to ensure the safety and stability of the entire device.

[0031] In general, the above technical solutions conceived by the present invention can achieve the following beneficial effects compared with the prior art:

[0032] 1. The anti-skid shaping device for the main cable of the space cable suspension bridge of the present invention is installed at the outlet of the main cable saddle, and a pre-tightening force is applied by applying torque to the locking nut of the pull rod assembly, so that the clamping assembly clamps the main cable, and the lateral anchoring assembly and the main cable strand are completely close to provide additional anti-skid ability when the saddle and the main cable have a sliding tendency, and a thin layer of rubber pad is arranged in the lateral anchoring assembly to increase the friction coefficient between the device and the main cable, thereby improving the anti-skid capacity reserve between the main cable and the saddle, solving the problem of relative sliding between the main cable and the saddle during the hoisting of the main beam of the multi-span space cable suspension bridge in the prior art, significantly improving the anti-skid ability between the saddle and the main cable, preventing the main cable from sliding under load, and enhancing the safety of the suspension bridge construction.

[0033] 2. The lateral anchoring component of the anti-slip shaping device for the main cable of the spatial cable suspension bridge of the present invention is an irregular steel plate, which is processed and manufactured according to the specific conditions of the main cable cross-section at the saddle outlet. Under the action of the clamping component, it is ensured to fit tightly with the main cable strand, restricting the shape of the main cable at the saddle outlet, ensuring the torsion and bulging of the main cable caused by different changes in the transverse direction and along the elevation direction of the main cable of the spatial cable structure during the beam lifting process, thereby improving the overall stability of the main cable.

[0034] 3. The anti-skid shaping device for the main cable of the spatial cable suspension bridge of the present invention supports the cable strands and prevents them from being squeezed and deformed by filling cable strand partitions in the gaps between the main cable strands coming out of the cable saddle, thereby solving the technical problem of bending and deformation caused by squeezing the strands when the device is in effect, achieving effective protection of the cable strands, avoiding bending and deformation of the strands, and extending the service life of the main cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic structural diagram of an anti-slip shaping device for a main cable of a space cable suspension bridge according to an embodiment of the present invention;

[0036] Figure 2 This is a schematic structural diagram of a top view of the main cable anti-slip shaping device of a space cable suspension bridge installed at the outlet of the cable saddle according to an embodiment of the present invention;

[0037] Figure 3 This is a schematic structural diagram of a side view of the main cable anti-slip shaping device of a space cable suspension bridge installed at the outlet of the cable saddle according to an embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of the connection between the clamping assembly and the lateral anchoring assembly of the anti-slip shaping device for the main cable of a space cable suspension bridge according to an embodiment of the present invention;

[0039] Figure 5 It is a schematic diagram of a large-scale drawing of a clamping assembly of an anti-slip shaping device for a main cable of a space cable suspension bridge according to an embodiment of the present invention;

[0040] Figure 6 It is a schematic diagram of a large-scale drawing of a lateral anchoring assembly of an anti-sliding shaping device for a main cable of a space cable suspension bridge according to an embodiment of the present invention;

[0041] Figure 7 The present invention is a flowchart of a method for installing an anti-slip shaping device for a main cable of a space cable suspension bridge according to an embodiment of the present invention.

[0042] In all the drawings, the same figure marks represent the same technical features, specifically: 1-clamping assembly, 101-first bolt hole, 2-pull rod assembly, 201-pull rod, 202-locking nut, 3-lateral anchoring assembly, 301-second bolt hole, 4-cable strand partition, 5-main cable strand, 6-cable saddle. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0044] It should be noted that if there are directional indications (such as up, down, left, right, front, back, etc.) involved in the embodiments of the present invention, the directional indications are only used to explain the relative position relationship and movement of the components under a certain specific posture (as shown in the attached drawings). If the specific posture changes, the directional indication will also change accordingly. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0045] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0046] In this patent, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "includes..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0047] The embodiment of the present invention provides a main cable anti-slip shaping device for a space cable suspension bridge, comprising a clamping assembly 1, a pull rod assembly 2, a lateral anchoring assembly 3 and a cable strand partition 4. The lateral anchoring assembly 3 is in direct contact with the saddle outlet, and the clamping assembly 1 is clamped by the pre-tightening force generated by the pull rod assembly 2 on the clamping assembly 1, so that the lateral anchoring assembly 3 and the main cable strand are fully in contact and anchored, thereby providing additional anti-slip capability when the saddle and the main cable have a sliding tendency, improving the anti-slip capability between the saddle and the main cable and controlling the shape of the main cable. At the same time, the cable strand partition 4 is filled in the gap between the cables coming out of the saddle to prevent the cables from being squeezed and deformed due to bending during the application of the pre-tightening force. The components of the device work together to improve the anti-slip performance of the main cable, maintain the good cable strand shape of the main cable, and improve the construction safety of the suspension bridge.

[0048] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0049] Example 1

[0050] like Figure 1-5 The figure shows the structure of the device of the present invention and the schematic diagram of the structure installed at the saddle outlet. The clamping assembly 1 is made of I-shaped steel. This design is both strong and lightweight. The cavity formed in the middle reduces the weight and ensures strength. A reserved hole is provided in the middle of the flange surface for passing the pull rod assembly 2 to apply a preload. The web is provided with a first bolt hole 101 for passing a bolt to connect the lateral anchor assembly 3. The first bolt hole 101 can be a round hole or a square hole, and its diameter or side length is slightly larger than the diameter of the bolt passing through it, so that the bolt can be allowed to move within a certain range when the outside of the clamping assembly 1 is subjected to force, so that the clamping assembly 1 produces a slight displacement in the direction close to the main cable strand 5 to apply a clamping force and clamp the main cable strand 5. The opening positions of the reserved hole and the first bolt hole 101 ensure that the pull rod assembly 2 and the bolt will not cross.

[0051] The pull rod assembly 2 includes a pull rod 201 and a locking nut 202, which work together to provide the necessary preload. The pull rod 201 is provided with a thread for the locking nut 202 to move thereon and apply torque. The pull rod 201 passes through the reserved holes of the flange plates at both ends of the clamping assembly 1, and the locking nuts 202 are tightened at both ends to apply pressure, and force is applied to the clamping assembly 1, so that the bolts connecting the clamping assembly 1 and the lateral anchoring assembly 3 are displaced in the first bolt hole 101 and the second bolt hole 301, driving the clamping assembly 1 to displace in the direction close to the main cable strand 5, thereby driving the lateral anchoring assembly 3 to move in the same direction to produce a slight displacement, which not only helps to clamp the cable strand 5, but also ensures the close fit between the lateral anchoring assembly 3 and the main cable, and generates sufficient anti-slip force.

[0052] like Figure 4-6 As shown, the lateral anchoring assembly 3 is an irregular steel plate, and its shape and size are processed and manufactured according to the specific conditions of the main cable section at the outlet of the saddle 6. This customized design ensures that the clamping assembly 1 can fit closely with the main cable strand 5, thereby effectively controlling the shape of the main cable strand 5, especially ensuring the integrity of the cable strand shape at the outlet of the saddle 6 when a load is applied. The lateral anchoring assembly 3 is installed on both sides of the main cable at the outlet of the saddle, and is tightly fitted and anchored with the main cable under the action of the preload force. A second bolt hole 301 matching the first bolt hole 101 on the web of the clamping assembly 1 is opened on the plate surface. The first bolt hole 101 and the second bolt hole 301 are aligned and passed through by bolts, and the clamping assembly 3 and the lateral anchoring assembly 1 are connected and fixed, which enhances the stability of the overall structure and jointly controls the shape of the main cable strand 5. At the same time, through the direct contact between the lateral anchoring assembly 3 and the outlet of the saddle 6, the anti-slip ability between the saddle and the main cable is improved. The lateral anchoring assembly 3 is also provided with a third bolt hole 302 for connecting and fixing the lateral anchoring assemblies 3 on both sides to form a more stable overall structure.

[0053] The cable strand partition 4 is installed in the gap between the main cable strands 5 at the saddle outlet to fill the gap between the cable strands and support the cable strands to prevent the strands from being squeezed and deformed when the device is in effect. In order to protect the main cable from damage, the edge of the cable strand partition is specially treated and polished into a smooth curved surface to reduce the potential risk of wear.

[0054] The device of the embodiment of the present invention installs the lateral anchoring assembly 1, the pull rod assembly 2, and the clamping assembly 3 at the outlet of the main cable saddle and fixes them by bolt connection, installs the cable strand partition 4 in the cable strand gap, applies torque through the locking nut 202, converts the tension applied by the pull rod 201 to the clamping assembly 3 into the anti-slip force of the device, and provides additional anti-slip ability when the cable saddle and the main cable have a sliding tendency through the close contact between the lateral anchoring assembly 1 and the cable saddle, and effectively protects the cable strands at the outlet of the cable saddle. It can not only ensure the integrity and shape of the main cable strands, but also significantly improve the anti-slip performance between the main cables, thereby improving the safety of the entire structure.

[0055] During use of the device, torque is applied to the locking nut 202, which rotates and moves up and down on the screw rod 2 to generate pressure on the clamping assembly 1. The clamping assembly 1 generates a slight displacement in the direction close to the main cable strand 5 to clamp the cable strand 5 to generate pressure on the strand, and makes the lateral anchoring assembly 3 tightly fit and anchor the main cable strand 5, and the cable strand partition 4 prevents the strand from being squeezed and bent and deformed; the lateral anchoring assembly 3 is in contact with the main cable strand 5 around the anchor to generate anti-slip force, and at the same time, the shape of the main cable at the saddle outlet is limited by the joint action of the clamping assembly 1 and the lateral anchoring assembly 3, ensuring the torsion and bulging of the main cable caused by different changes in the transverse direction and along the elevation direction of the main cable of the spatial cable structure during the beam lifting process, thereby improving the integrity of the main cable. During the process, the preload force is adjusted by establishing a calculation model for the fit between the lateral anchoring assembly and the main cable strands, the bending deformation of the strands, and the preload force, so as to optimize the fit between the main cable and the lateral anchoring assembly and consider the deformation behavior of the main cable under the action of the preload force, thereby improving the anti-slip force of the main cable and ensuring the integrity of the strands.

[0056] The adjustment of preload takes into account the contact pressure distribution, friction and the factors to prevent the plastic deformation of the material. The following is the preload calculation model based on these factors:

[0057] (1) Calculation of close fit factor

[0058] Considering that the contact between the lateral anchor assembly and the main cable is irregular, finite element analysis is used to simulate the actual contact pressure distribution p(x,y), where x and y represent the two coordinate directions along the contact surface. c Calculated by numerically integrating the pressure over all small areas of the contact surface:

[0059]

[0060] Among them, A c is the actual contact area, A max is the theoretical maximum contact area, p max (x,y) is the contact pressure distribution under ideal conditions.

[0061] (2) Calculation of friction and anti-slip force

[0062] The friction coefficient μ is not a constant value, but varies with factors such as contact pressure and relative sliding speed. A friction coefficient function μ(p) that depends on contact pressure is introduced to more accurately describe the friction behavior. The total friction force F f It can be expressed as:

[0063]

[0064] To ensure that no slip occurs, the friction force F fShould be greater than or equal to the sum of all external forces that may cause sliding F ext :

[0065] F f ≥F ext

[0066] (3) According to the friction requirements, the preload force F p The minimum value of should meet the following conditions:

[0067]

[0068] (4) Prevent the strands from bending and deforming

[0069] In order to avoid bending deformation of the strands, it is necessary to consider the maximum allowable stress σ of each strand. max and safety margin for plastic deformation. Assume that the cross-sectional area of ​​each strand is A s , then the average stress σ borne by each strand should not exceed its yield strength S y Subtract the safety margin ΔS:

[0070]

[0071] (5) Combining the above conditions, the final preload adjustment formula is obtained:

[0072]

[0073] Through the above calculation model, the preload force can be more precisely controlled while ensuring that the lateral anchoring assembly fits tightly against the main cable, effectively preventing the strands from bending and deforming due to excessive compression.

[0074] Example 2

[0075] like Figure 7 As shown, an embodiment of the present invention provides a method for installing and using a main cable anti-slip shaping device for a space cable suspension bridge, comprising the following specific steps:

[0076] S100: Before starting the installation, arrange the cable strands at the cable saddle outlet to ensure that the cable strand surface is flat and there is no wire twisting. In addition, the cable strand surface needs to be cleaned to remove any debris or dirt that may exist to ensure that the contact surface is clean and flat when the components are installed.

[0077] S200: Install the cable strand partition 4 into the gap between the cable strands at the cable saddle outlet. During installation, make sure that the cable strand partition 4 is flush with the top and bottom of the main cable strand 5.

[0078] S300: Install the lateral anchoring assemblies 3 symmetrically on the left and right sides and temporarily fix them. In order to reduce direct metal contact between the lateral anchoring assemblies and the main cable strands and avoid potential wear, a 3mm thick rubber pad should be placed inside the lateral anchoring assemblies as a buffer layer before installation. After installation, ensure that the lateral anchoring assemblies 3 fit tightly against the main cable strands 5. If there is a gap between the two, fill it with wooden strips or rubber pads until they fit perfectly. Install the clamping assembly 1 between the two lateral anchoring assemblies 3 on the same side and fix them with bolts. For each saddle outlet, a total of four lateral anchoring assemblies 3 and two clamping assemblies 1 need to be installed.

[0079] S400: Fine-tune the position of the lateral anchor assembly to ensure that it is in direct contact and fit with the saddle outlet. At this time, fix the lateral anchor assembly. If it is found that it cannot be completely tight during the adjustment process, you can use a rubber pad to fill the gap to achieve the best fit.

[0080] S500: Pass the pull rod 201 through the clamping assembly 1 and lock it with locking nuts 202 at both ends.

[0081] S600: According to the calculated preload force required, apply torque to the locking nut 202 slowly and evenly to generate preload force on the clamping assembly 1 to clamp the main cable strand. During the process, monitor the deformation of the main cable strand and the fit between the lateral anchoring assembly and the main cable in real time. Adjust the preload force according to the preload force calculation model so that the inner periphery of the lateral anchoring assembly 3 is completely in fit with the main cable strand and thus anchored to the main cable. Provide additional anti-slip capability when the saddle and the main cable tend to slide, improve the anti-slip force between the main cable and the saddle, maintain the shape and position of the strand, and complete the installation of the entire device. During the process, use a rubber pad to insert the gap between the saddle 6 and the device caused by tensioning.

[0082] This device must be installed at both ends of the saddle on the middle tower to improve the anti-slip ability between the main cable and the saddle to resist the uneven load between the two adjacent main spans, and at the same time realize the shaping of the cable strands at the saddle outlet.

[0083] It will be easily understood by those skilled in the art that the above description is only 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 in the protection scope of the present invention.

Claims

1. A main cable anti-slip shaping device for a space cable suspension bridge, characterized in that: include: A clamping assembly (1), a pull rod assembly (2), a lateral anchoring assembly (3) and a cable strand spacer (4), wherein: The pull rod assembly (2) comprises a pull rod (201) and a locking nut (202) for applying a pre-tightening force; The clamping assembly (1) is installed between the lateral anchoring assemblies (3) and connected by bolts. It is made of I-shaped steel and allows the pull rod (201) to pass through and is locked and connected by the locking nut (202) to withstand the preload force applied by the pull rod assembly (2); The lateral anchoring assembly (3) is an irregular steel plate, which is processed and manufactured according to the cross-sectional dimensions of the main cable at the saddle outlet, installed on both sides of the main cable at the saddle outlet, and is tightly fitted and anchored with the main cable under the action of the pre-tightening force; The cable strand partition (4) is installed in the main cable strand gap at the cable saddle outlet to prevent the strands from being squeezed and bent when a pre-tightening force is applied; The pull rod (201) passes through the inside of the clamping assembly (1), and the locking nuts (202) are installed at both ends. The pre-tightening force is applied to the clamping assembly (1) by slowly and evenly applying torque to the locking nuts (202), so that the cable strands are clamped, so that the inside of the lateral anchoring assembly (3) and the main cable strands are completely fitted, thereby being anchored to the main cable, and the pre-tightening force is adjusted by establishing a calculation model of the fit, the bending deformation of the strands and the pre-tightening force.

2. The anti-slip shaping device for the main cable of a space cable suspension bridge according to claim 1, characterized in that: The preload calculation steps are as follows: Step 1: Analyze the contact pressure and fit between the main cable and the lateral anchor assembly, and calculate the tight fit factor; Step 2: Accurately calculate the friction force through the friction coefficient function that depends on the contact pressure, ensure that the total friction force is greater than or equal to the sum of all external forces that may cause sliding to prevent slipping, and obtain the anti-slip force; Step 3: Calculate the minimum value of the preload force based on the friction force requirement to ensure that it can provide sufficient friction to prevent the main cable from slipping; Step 4: Considering the maximum allowable stress of each strand and the safety margin of plastic deformation, limit the average stress of each strand to not exceed its yield strength minus the safety margin; Step 5: Comprehensively optimize the preload: Combine the tight fit and strand stress limit conditions to derive the final preload adjustment formula to ensure that the lateral anchor assembly fits tightly to the main cable and prevent the strands from being over-compressed and causing bending deformation.

3. The anti-slip shaping device for the main cable of a space cable suspension bridge according to claim 1, characterized in that: A reserved hole for passing the pull rod (201) is provided in the middle of the flange of the clamping assembly (1), and a first bolt hole (101) is provided on the web.

4. The anti-slip shaping device for the main cable of a space cable suspension bridge according to any one of claims 1 to 3, characterized in that: The plate surface of the lateral anchoring assembly (3) is provided with a second bolt hole (301) matching the first bolt hole (101) on the web of the clamping assembly (1) for connecting the clamping assembly (1) and the lateral anchoring assembly (3) through bolts.

5. The anti-slip shaping device for the main cable of a space cable suspension bridge according to claim 4, characterized in that: The diameters of the first bolt hole (101) and the second bolt hole (301) are larger than the diameters of the bolts passing through them, allowing the clamping assembly (1) to generate a slight displacement in a direction close to the main cable strand when subjected to a pre-tightening force.

6. The anti-slip shaping device for the main cable of a space cable suspension bridge according to claim 1, characterized in that: The pull rod (201) is provided with a thread for the locking nut (202) to rotate and move thereon to apply torque.

7. The anti-slip shaping device for the main cable of a space cable suspension bridge according to claim 1, characterized in that: The edges of the cable strand separators (4) are specially processed and polished into smooth curved surfaces.

8. The anti-slip shaping device for main cable of a space cable suspension bridge according to claim 1, characterized in that: It also comprises a rubber pad which is arranged between the lateral anchoring assembly (3) and the main cable strand to increase friction.

9. A method for installing an anti-slip shaping device for a main cable of a space cable suspension bridge, which is implemented by using an anti-slip shaping device for a main cable of a space cable suspension bridge as claimed in any one of claims 1 to 8, characterized in that: The specific steps include: S100: Arrange the cable strands at the saddle outlet to ensure that the surface of the cable strands is flat and there is no wire twisting. Clean the surface of the cable strands to remove any debris or dirt that may exist, so as to ensure that the contact surface is clean and flat when the components are installed. S200: Install the strand spacer in the gap between the strands at the saddle exit. When installing, make sure that the strand spacer is flush with the top and bottom of the main cable strand. S300: Place a 3mm thick rubber pad inside the lateral anchor assembly, install the lateral anchor assemblies symmetrically on the left and right sides and temporarily fix them. For each saddle outlet, a total of four lateral anchor assemblies need to be installed, and a clamping assembly is installed between two lateral anchor assemblies on the same side and fixed by bolts; S400: Fine-tune the position of the lateral anchor assembly to ensure that it is in direct contact and fit with the saddle outlet, and fix the lateral anchor assembly; S500: Pass the tie rod through the reserved hole on the flange of the clamping assembly and lock it with lock nuts at both ends; S600: According to the calculated tension, torque is applied evenly and slowly to the locking nut to generate pre-tightening force on the clamping assembly to clamp the main cable strand. During the process, the pre-tightening force is adjusted according to the pre-tightening force calculation model so that the inner periphery of the lateral anchoring assembly and the main cable strand are completely fitted together so as to be anchored with the main cable, thereby completing the installation of the entire device.

10. The installation method of the anti-slip shaping device for the main cable of a space cable suspension bridge according to claim 9, characterized in that: It also includes that when fine-tuning the position of the lateral anchor assembly, if there is a gap between it and the saddle outlet, it is filled with wooden strips or rubber pads until it fits perfectly; when the preload force is applied, if new gaps appear between the saddle and the lateral anchor assembly, thin rubber pads are inserted into these gaps to ensure the safety and stability of the entire device.

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