Oversized side span main cable erecting method

Abstract

The invention discloses a super-large side span main cable erecting method, which belongs to the technical field of bridge construction, and comprises the following steps: arranging a temporary cable saddle support pad on a support tower, and arranging a temporary cable saddle body, a jacking bracket and a retainer; the main cable structure is pulled and limited to the temporary cable saddle and the retainer; the temporary cable saddle body is closed and locked to clamp the main cable structure, and cable tightening operation is conducted on the main cable structure; the connection between the temporary cable saddle body and the temporary cable saddle supporting cushion is removed, the midspan steel beam is hoisted to tighten and lift the main cable structure, meanwhile, the jacking bracket is operated to jack the main cable structure, the temporary cable saddle body is separated from the temporary cable saddle supporting cushion, and the lower half part of the temporary cable saddle body is removed; the closed locking state of the temporary cable saddle body is relieved, and the upper half portion of the temporary cable saddle body and the temporary cable saddle supporting cushion are removed; a permanent cable saddle lower half saddle body is arranged at the top of the supporting tower; and the main cable structure descends into the lower half saddle body of the permanent cable saddle and is limited, and the upper half saddle body of the permanent cable saddle is buckled to the lower half saddle body of the permanent cable saddle and is fixed.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and in particular to a method for erecting a main cable of an ultra-large side span. Background Art

[0002] Suspension bridges are widely used in long-span bridge construction due to their exceptional spanning capacity and adaptability to terrain. In ultra-long-span suspension bridges, differences in geographical conditions between the two banks often lead to an imbalance in the ratio of the side span to the main span, resulting in an asymmetric load-bearing system with extremely large side spans and main spans. To balance the load distribution across the bridge, rigid restraint systems are typically installed on the extra-large side spans. Auxiliary saddles are installed atop auxiliary towers to optimize the main cable force transmission path and ensure overall structural stability.

[0003] Existing technology employs a rigid restraint system for super-large side span main cable installation. The core of this system is the installation of a split secondary saddle structure atop the auxiliary tower. This secondary saddle consists of an upper and lower saddle body, pre-tightened and secured with high-strength bolts. A one-way sliding support is located at the bottom to accommodate construction movement. During construction, the lower saddle body is first installed to temporarily secure the main cable strands. The upper saddle body is then installed after the main cable is installed. During main cable installation, the lower saddle body is used to position the cable strands in space and to compact the main cable cross-section during cable tightening.

[0004] However, this existing technology lacks a longitudinal restraint mechanism in the lower saddle, which makes the cables prone to slippage due to temperature changes and construction disturbances, resulting in inaccurate control of the elevation of the main cable restraint point. Furthermore, the lateral positioning function is insufficient, and the cable arrangement is prone to disorder. Furthermore, due to the split structure, the upper main cable is unconstrained during construction, posing a risk of cable dislocation. This makes subsequent installation of the upper saddle difficult, seriously affecting the accuracy of the bridge alignment. Summary of the Invention

[0005] The purpose of the present invention is to provide a method for installing an ultra-large side span main cable to solve the technical problems existing in the prior art, such as uncontrolled longitudinal slippage of the main cable during construction, disordered lateral arrangement of the cables, and the risk of unconstrained dislocation of the upper main cable.

[0006] As conceived above, the technical solution adopted by the present invention is:

[0007] A method for installing a super-large side span main cable, comprising:

[0008] Step 1: Set a temporary saddle pad on the top of the support tower, detachably install the temporary saddle body on the temporary saddle pad, and set a lifting bracket and a retainer on the side of the support tower;

[0009] Step 2: erecting a main cable structure, pulling the main cable structure and confining it to the temporary saddle body and the retainer;

[0010] Step 3: closing and locking the temporary saddle body to clamp the main cable structure, and performing a cable tightening operation on the main cable structure;

[0011] Step 4: Release the connection between the temporary saddle body and the temporary saddle support pad, hoist the mid-span steel beam to tighten and lift the main cable structure, and at the same time operate the jacking bracket to jack up the main cable structure to separate the temporary saddle body from the temporary saddle support pad, and remove the lower half of the temporary saddle body;

[0012] Step 5: Release the closed locking state of the temporary saddle body, and remove the upper half of the temporary saddle body and the temporary saddle support pad;

[0013] Step 6: Install the lower half of the permanent saddle on the top of the support tower;

[0014] Step 7: erect the side span steel beam, lower the main cable structure into the lower half of the permanent saddle and limit it, and buckle the upper half of the permanent saddle to the lower half of the permanent saddle and fix it.

[0015] Preferably, the upper part of the temporary saddle body includes a clamp structure that is interlocked and is detachably connected by a locking bolt.

[0016] Preferably, in step 2: before erecting the main cable structure, a catwalk structure is first erected, wherein the catwalk structure includes catwalk load-bearing cables, gantry load-bearing cables and a main cable erection traction system.

[0017] Preferably, the main cable structure section near the supporting tower is defined as a temporary section. In step three, when the main cable structure is tightened, the main cable structure in the temporary section is not tightened.

[0018] Preferably, the step five further includes performing a cable tightening operation on the main cable structure of the temporary section.

[0019] Preferably, in step six, a permanent saddle lower half saddle is provided on the top of the support tower, including: providing a permanent saddle support pad on the top of the support tower; placing the permanent saddle lower half saddle on the permanent saddle support pad, and aligning the permanent saddle lower half saddle with a preset marking point of the main cable structure; sliding the permanent saddle lower half saddle to the preset marking point.

[0020] Preferably, in step seven, the upper half of the permanent saddle is fastened to the lower half of the permanent saddle and fixed, including: lifting the upper half of the permanent saddle by the swinging method, and limiting the upper half of the permanent saddle and the lower half of the permanent saddle with temporary long pull rod bolts; in the process of continuing to lift the steel beam, when the main cable structure reaches the bridge line shape, the upper half of the permanent saddle is fastened to the lower half of the permanent saddle and fixed.

[0021] Preferably, the step one further comprises: arranging a support gantry on the support tower, and arranging a slidable winch on the support gantry, wherein the winch is used for hoisting the temporary saddle pad.

[0022] Preferably, two winches are provided, and the two winches are symmetrically distributed about the axis of the main cable structure.

[0023] Preferably, the step one further comprises: providing a permanent auxiliary saddle bottom plate and a permanent auxiliary saddle slide lower supporting plate on the top of the support tower.

[0024] Beneficial effects of the present invention:

[0025] The present invention proposes a method for erecting a super-large side span main cable. First, a temporary saddle pad and a detachable temporary saddle body are installed on the top of the support tower, and a lifting bracket and retainer are installed on the side. This structural design allows the main cable structure to be effectively pulled and limited during the erection process of the main cable structure, solving the problem of easy disorder in the lateral arrangement of the cable strands in the prior art and achieving good lateral positioning of the cable strands. Secondly, by first closing and locking the temporary saddle body to clamp the main cable structure and then performing the cable tightening operation, the stability of the main cable during the cable tightening process is guaranteed, and the longitudinal slippage of the main cable under temperature changes and construction disturbances is avoided, thus solving the problem of uncontrolled longitudinal slippage. Furthermore, the main cable structure is naturally tightened and lifted by hoisting the mid-span steel beam, and the lifting bracket is synchronously operated to actively lift the main cable structure to avoid the problem of uncontrolled slippage under construction disturbances. After removing the lower and upper parts of the temporary saddle, along with the temporary saddle supports, the side span steel beams are installed to drive the main cable structure down smoothly, and fine-tuned with the jacking brackets. The main cable structure is precisely embedded in the grooves of the lower half of the permanent saddle, ensuring zero deviation from the designed alignment of the completed bridge. Finally, the upper half of the permanent saddle is fastened, and the steel beam load is used to dynamically balance the tension in the main cable structure. In summary, this method for installing the main cable for the extra-large side span utilizes a rational step design and utilizes jacking brackets in conjunction with the hoisting of the steel beams to ensure a smooth transition of the main cable structure to the permanent saddle. The entire construction process is orderly and efficient, effectively resolving a series of technical issues existing in existing technologies and improving the quality and reliability of the extra-large side span main cable installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1This is a flow chart of a method for installing a super-large side span main cable according to an embodiment of the present invention;

[0027] Figure 2 This is a first schematic diagram of a method for installing a super-large side-span main cable provided by an embodiment of the present invention;

[0028] Figure 3 is a second schematic diagram of the method for installing a super-large side span main cable provided by an embodiment of the present invention;

[0029] Figure 4 is a third schematic diagram of a method for installing a super-large side span main cable provided by an embodiment of the present invention;

[0030] Figure 5 This is a front view of a temporary saddle body provided by an embodiment of the present invention;

[0031] Figure 6 is a side view of a temporary saddle body provided by an embodiment of the present invention;

[0032] Figure 7 is a fourth schematic diagram of a method for installing a super-large side span main cable provided by an embodiment of the present invention;

[0033] Figure 8 is a fifth schematic diagram of a method for installing a super-large side span main cable provided by an embodiment of the present invention;

[0034] Figure 9 is a sixth schematic diagram of a method for installing a super-large side span main cable provided by an embodiment of the present invention;

[0035] Figure 10 is a seventh schematic diagram of a method for installing a super-large side span main cable provided by an embodiment of the present invention;

[0036] Figure 11 is an eighth schematic diagram of a method for installing a super-large side span main cable provided by an embodiment of the present invention;

[0037] Figure 12 is a ninth schematic diagram of a method for installing a super-large side span main cable provided by an embodiment of the present invention;

[0038] Figure 13 is a tenth schematic diagram of a method for installing a super-large side span main cable provided by an embodiment of the present invention;

[0039] Figure 14 This is an eleventh schematic diagram of a method for installing a super-large side span main cable provided by an embodiment of the present invention;

[0040] Figure 15 is a twelfth schematic diagram of a method for installing a super-large side span main cable provided by an embodiment of the present invention;

[0041] Figure 16is a thirteenth schematic diagram of a method for installing a super-large side span main cable provided by an embodiment of the present invention;

[0042] Figure 17 This is the fourteenth schematic diagram of the method for installing the super-large side span main cable provided by an embodiment of the present invention.

[0043] In the picture:

[0044] 100, support tower; 101, support gantry; 102, winch; 200, main cable structure; 300, temporary saddle pad; 400, permanent auxiliary saddle bottom plate; 500, permanent auxiliary saddle slide plate; 600, permanent saddle pad;

[0045] 1. Temporary saddle body; 2. Retainer; 3. Lifting bracket; 4. Permanent saddle; 41. Permanent saddle lower half; 42. Permanent saddle upper half; 5. Catwalk structure; 51. Catwalk load-bearing rope; 52. Gantry load-bearing rope; 53. Main cable erection and traction system. DETAILED DESCRIPTION

[0046] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to explain the present invention, but are not to be construed as limiting the present invention.

[0047] In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0048] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0049] The technical solution of the present invention will be further described below with reference to the accompanying drawings and through specific implementation methods.

[0050] See also Figures 1 to 17 The method for erecting the super-large side span main cable provided by the embodiment of the present invention includes the following steps: 1. setting a temporary saddle support pad 300 on the top of the support tower 100, detachably mounting the temporary saddle body 1 on the temporary saddle support pad 300, and setting a lifting bracket 3 and a retainer 2 on the side of the support tower 100; 2. erecting the main cable structure 200, pulling the main cable structure 200 and limiting it to the temporary saddle body 1 and the retainer 2; 3. closing and locking the temporary saddle body 1 to clamp the main cable structure 200, and tightening the main cable structure 200; 4. releasing the connection between the temporary saddle body 1 and the temporary saddle support pad 300, and hoisting The cross-span steel beam tightens and lifts the main cable structure 200, and at the same time, the lifting bracket 3 is operated to lift the main cable structure 200, so that the temporary saddle 1 is separated from the temporary saddle support 300, and the lower half of the temporary saddle 1 is removed; Step five, release the closed and locked state of the temporary saddle 1, remove the upper half of the temporary saddle 1 and the temporary saddle support 300; Step six, set the permanent saddle lower half saddle 41 on the top of the support tower 100; Step seven, erect the side span steel beam, lower the main cable structure 200 into the permanent saddle lower half saddle 41 and limit it, and buckle the permanent saddle upper half saddle 42 into the permanent saddle lower half saddle 41 and fix it.

[0051] The super-large side-span main cable erection method has the following advantages.

[0052] The specific steps of the super-large side-span main cable erection method are described below.

[0053] Step one, a temporary cable saddle support pad 300 is arranged on the top of the support tower 100, and a detachable temporary cable saddle saddle body 1 is detachably installed on the temporary cable saddle support pad 300. The temporary cable saddle saddle body 1 and the temporary cable saddle support pad 300 are detachably connected, so that the temporary cable saddle saddle body 1 can be easily operated at different stages of construction, such as subsequent removal and other steps, which not only ensures the stability of the temporary cable saddle saddle body 1 during use, but also takes into account the flexibility of construction.

[0054] In step 1, a jacking bracket 3 and a retainer 2 are also set on the side of the support tower 100. The function of the jacking bracket 3 is to be able to jack up the main cable structure 200 in the subsequent construction steps, and to adjust the position of the main cable structure 200 by accurately controlling the jacking height to meet various requirements during the construction process. The retainer 2 is mainly responsible for limiting and fixing the main cable structure 200, preventing the main cable structure 200 from unnecessary displacement due to external forces and other factors during the construction process, ensuring that the main cable structure 200 is always in the appropriate position, and ensuring the smooth installation of the main cable structure 200 and the accuracy of the overall construction.

[0055] Specifically, a support gantry 101 is mounted on the support tower 100, and a slidable winch 102 is mounted on the support gantry 101. The winch 102 is used to hoist the temporary saddle pad 300. The support gantry 101 provides a stable installation foundation for the winch 102, making it more stable and reliable during the hoisting operation. This ensures that the temporary saddle pad 300 is accurately hoisted to the predetermined position at the top of the support tower 100, improving installation accuracy and efficiency. The slidable design of the winch 102 increases flexibility during the hoisting process, enabling better adaptation to different location requirements and facilitating adjustment of the temporary saddle pad 300's position.

[0056] Preferably, two hoists 102 are provided, symmetrically distributed about the axis of the main cable structure 200. Providing two hoists 102 symmetrically distributed about the axis of the main cable structure 200 allows for more uniform lifting force. During the lifting of the temporary saddle support pad 300, tilting or shaking of the pad due to uneven force can be effectively avoided, further improving the stability and safety of the lifting, ensuring the smooth installation of the temporary saddle support pad 300, and providing a good foundation for the subsequent installation of the main cable structure 200.

[0057] In addition, step one also includes setting a permanent auxiliary cable saddle bottom plate 400 and a permanent auxiliary cable saddle slide lower plate 500 on the top of the support tower 100. By setting the permanent auxiliary cable saddle bottom plate 400 and the permanent auxiliary cable saddle slide lower plate 500 on the top of the support tower 100, preparations are made in advance for the installation of the permanent auxiliary cable saddle. In subsequent construction steps, the permanent auxiliary cable saddle can be installed directly on the permanent auxiliary cable saddle bottom plate 400 and the permanent auxiliary cable saddle slide lower plate 500 that have been set up, which reduces the time and process for basic preparation work after the temporary structure is dismantled, optimizes the construction process, and improves the overall construction efficiency. At the same time, it can also better ensure the accuracy of the permanent auxiliary cable saddle installation position, thereby ensuring the matching accuracy between the main cable and the permanent auxiliary cable saddle, which is conducive to improving the stability and reliability of the overall bridge structure.

[0058] The upper portion of the temporary saddle body 1 comprises a clamping structure that interlocks and is detachably connected via locking bolts, forming a stable whole that tightly clamps the main cable structure 200, effectively preventing displacement of the main cable structure 200 due to external forces during construction. This provides a stable and reliable constraint environment for cable tightening operations, ensuring the shape and position accuracy of the main cable structure 200 during the tightening process, thereby preventing longitudinal slippage and lateral disorder in the main cable. The detachable connection design also facilitates the removal of the temporary saddle body 1 according to the needs of different stages in the later stages of construction. For example, after completing the tightening of the main cable structure 200 and related operations, the upper portion of the temporary saddle body 1 can be conveniently removed in sequence by removing the locking bolts. This does not affect the main cable structure 200, but allows for the smooth installation of subsequent permanent saddles 4 and other work. This optimizes the construction process, improves construction efficiency, and ensures the orderliness and accuracy of the entire super-large side span main cable installation process.

[0059] Step 2: erecting the main cable structure 200 , pulling the main cable structure 200 and confining it to the temporary saddle body 1 and the retainer 2 .

[0060] Specifically, first, the main cable structure 200 is gradually pulled from the starting position to the predetermined installation path. During the pulling process, it is ensured that the main cable structure 200 moves along the designed route to avoid deviation, twisting or other unsatisfactory situations.

[0061] When the main cable structure 200 is pulled to the temporary saddle, it must be accurately placed in the temporary saddle's cable groove. The temporary saddle body 1 then provides support and guidance, enabling the main cable structure 200 to smoothly transition to the top of the support tower 100. It also provides a stable support point for the main cable structure 200, ensuring its stability and accuracy in this position, while guiding the main cable structure 200 to continue extending in the designed direction and angle.

[0062] At the same time, retainer 2 limits the main cable structure 200. Through its structural design and installation position, it constrains the main cable structure 200 within a specific range, preventing lateral or longitudinal displacement of the main cable structure 200 due to wind, changes in traction, or other external factors during installation. Retainer 2 ensures that each strand in the main cable structure 200 remains in the correct position, preventing problems such as misalignment and compression between strands, and ensuring that the overall shape and alignment of the main cable structure 200 meet design requirements.

[0063] Through the coordinated action of the temporary saddle and the retainer 2, the main cable structure 200 can be effectively controlled and constrained during the installation process, which not only ensures the accuracy of the main cable's position in space, but also ensures the relative position relationship of each strand in the main cable, laying a solid foundation for the subsequent cable tightening operation and the smooth completion of the entire main cable installation work.

[0064] Preferably, in step 2, before erecting the main cable structure 200 , the catwalk structure 5 is erected first, wherein the catwalk structure 5 includes a catwalk load-bearing cable 51 , a gantry load-bearing cable 52 and a main cable erection traction system 53 .

[0065] The catwalk load-bearing cable 51 is the basic supporting part of the catwalk structure 5, and it needs to be arranged across the side span and main span and other areas. The catwalk load-bearing cable 51 uses high-strength, corrosion-resistant steel cable materials. Through professional construction equipment and methods, it starts from a fixed point on one side of the bridge tower, spans the corresponding span, and extends to the other side of the bridge tower or other fixed support points. Its function is to provide the main vertical support force for the entire catwalk system, and bear the weight of various equipment, materials and construction personnel subsequently laid on the catwalk. During the installation process, the tension and sag of the catwalk load-bearing cable 51 need to be precisely controlled to ensure that it can be evenly stressed and remain stable under different environmental conditions.

[0066] The gantry load-bearing cables 52 typically work in conjunction with the catwalk load-bearing cables 51 and are typically installed on a gantry structure at a specific location above the catwalk. The gantry structures are spaced regularly along the catwalk, and the gantry load-bearing cables 52 connect between these gantries. They primarily assist the catwalk load-bearing cables 51 in further enhancing the stability of the catwalk system, playing a particularly important role in withstanding lateral wind and lateral impact forces. They prevent the catwalk from excessive lateral sway or deformation in complex environments, ensuring the safety of construction personnel and equipment operating on the catwalk.

[0067] The main cable installation traction system 53 is a key component for smoothly traction of the main cable structure 200 from its starting point to its intended location. The main cable installation traction system 53 comprises a traction cable, a winch structure, a diverting pulley assembly, and other equipment. The traction cable is typically a high-strength and flexible steel cable, one end of which is connected to the main cable structure 200 and the other end is connected to the winch structure via a series of diverting pulley assemblies. The winch structure serves as a power source, controlling the rotation of a drum to retract and release the traction cable, thereby traction of the main cable structure 200. The diverting pulley assembly is positioned along the catwalk and at key locations such as the bridge tower to change the direction of the traction cable, allowing the main cable to move accurately along the intended path. The traction system is also equipped with appropriate speed control and tension monitoring devices to ensure a stable main cable speed and an appropriate tension range during the traction process, avoiding damage to the main cable due to uneven tension or sudden speed changes, and ensuring the safety and smooth progress of the main cable installation.

[0068] Step 3: Close and lock the temporary saddle body 1 to clamp the main cable structure 200 and perform a cable tightening operation on the main cable structure 200.

[0069] The closing and locking of the temporary saddle body 1 is completed, providing a stable constraint environment for the main cable structure 200. At this time, the main cable structure 200 can be tightened.

[0070] The cable tightening operation is intended to compact the loosely arranged strands in the main cable to form a tight, overall circular or nearly circular cross-section.

[0071] Cable tightening operations utilize specialized equipment, such as a cable tightening machine. The machine gradually moves along the length of the main cable, applying radial pressure to the cable, bringing the strands closer together and creating a tighter alignment. During the tightening process, operators must closely monitor parameters such as the main cable's diameter, roundness, and the fit between the strands.

[0072] To ensure cable tightening quality, relevant parameters are measured and recorded after each main cable tightening operation. If the main cable diameter does not meet design requirements or if there is a significant deviation in roundness, the tensioner pressure or position must be adjusted promptly and the cable tightened again. The cable strands must also be checked for tight fit and the absence of gaps or crossovers. Any problems must be corrected promptly.

[0073] By closing and locking the temporary saddle body 1 to clamp the main cable structure 200 and then performing the cable tightening operation, the shape stability and mechanical properties of the main cable structure 200 during the subsequent construction process can be ensured, laying the foundation for the overall structural safety of the bridge.

[0074] Preferably, the section of the main cable structure 200 near the support tower 100 is defined as a temporary section. In step three, when the main cable structure 200 is tightened, the cable tightening operation is not performed on the main cable structure 200 in the temporary section. Since the temporary saddle 1 is tightly connected to the main cable structure 200 near the support tower 100, tightening the cable here may destroy the stable clamping state between the temporary saddle 1 and the main cable due to local stress concentration, and even affect the structural safety of the support tower 100. By not tightening the main cable structure 200 in the temporary section, the stability of the temporary saddle 1 and the support tower 100 during the cable tightening process is guaranteed. In addition, subsequent construction involves the removal of the temporary saddle body 1 and the installation of the permanent saddle 4. The main cable structure 200 in the temporary section is not tightened, so that the main cable structure 200 remains relatively loose and flexible in this area, which is convenient for the removal of the temporary saddle body 1 and the position adjustment of the main cable when the permanent saddle 4 is installed, thereby improving the convenience of subsequent construction, reducing the difficulty of construction, ensuring the smooth progress of the main cable installation process of the super-large side span, and ultimately ensuring the overall construction quality and safety of the bridge.

[0075] Step 4: Release the connection between the temporary saddle body 1 and the temporary saddle support pad 300, hoist the mid-span steel beam to tighten and lift the main cable structure 200, and at the same time operate the jacking bracket 3 to jack up the main cable structure 200, so that the temporary saddle body 1 is separated from the temporary saddle support pad 300, and the lower half of the temporary saddle body 1 is removed.

[0076] Specifically, the mid-span steel beam is hoisted by large-scale lifting equipment, slowly moved to the predetermined position and installed. During this process, as the mid-span steel beam is in place, the main cable structure 200 is affected by the weight of the steel beam itself and the tension generated during the installation process, thereby gradually tightening and lifting.

[0077] At the same time, the jacking bracket 3 is operated to jack up the main cable structure 200. The jacking bracket 3 is usually equipped with a hydraulic or mechanical jacking device. The operator controls the jacking bracket 3 to slowly and evenly lift the main cable structure 200, thereby helping the main cable structure 200 to reach a suitable height, so that the temporary saddle 1 can be smoothly separated from the temporary saddle support pad 300. During this process, the jacking height and speed of the jacking bracket 3 need to be precisely controlled to ensure that it is coordinated with the lifting of the main cable structure 200 caused by the lifting of the mid-span steel beam, so as to avoid additional stress impact or uneven deformation of the main cable structure 200.

[0078] Once the main cable structure 200 has been lifted to a sufficient height to create sufficient clearance between the temporary saddle 1 and the temporary saddle support pad 300, the lower half of the temporary saddle 1 can be removed. This removal requires professional construction personnel using appropriate lifting equipment to smoothly lift the lower half of the temporary saddle 1 to a safe location. During the removal process, special attention must be paid to protecting the main cable structure 200 to avoid damage such as scratches and collisions caused by improper operation. This ensures the integrity and safety of the main cable structure 200 and creates favorable conditions for subsequent construction steps.

[0079] Step five also includes tightening the main cable structure 200 in the temporary section, which can make the tension of the entire main cable structure 200 uniform and improve the overall mechanical properties and stability of the main cable structure 200. Uniform tensioning can make the main cable structure 200 more evenly stressed when bearing loads, reduce stress concentration, and reduce the risk of local damage to the main cable, thereby ensuring the safety of the bridge during long-term use. At the same time, tightening the temporary section helps improve the compatibility of the main cable structure 200 with the subsequently installed permanent saddle 4, ensuring more accurate positioning of the main cable structure 200 within the permanent saddle 4, further optimizing the bridge's alignment accuracy, and improving the overall quality of the super-large side span main cable installation.

[0080] Step 6: Install the lower half saddle body 41 of the permanent cable saddle on the top of the support tower 100 .

[0081] Specifically, a permanent saddle support pad 600 is installed on top of the support tower 100. The function of the permanent saddle support pad 600 is to provide a stable support platform for the permanent saddle lower half 41. During the installation process, it is necessary to ensure that the permanent saddle support pad 600 is accurately installed, and its surface flatness, levelness and other parameters must strictly meet the design requirements. This creates good conditions for the subsequent installation of the permanent saddle lower half 41 and ensures its stability and reliability.

[0082] Afterwards, the lower half of the permanent saddle 41 is placed on the permanent saddle support pad 600 and aligned with the preset marking point on the main cable structure 200. When placing the lower half of the permanent saddle 41, the construction personnel need to use a lifting device to slowly lift it above the support pad. Then, using the fine-tuning equipment, the position of the lower half of the permanent saddle 41 is adjusted so that it is precisely aligned with the preset marking point on the main cable structure 200.

[0083] Finally, slide the lower half of the permanent saddle 41 to the preset marking point. This sliding operation allows for further precise adjustment of the position of the lower half of the permanent saddle 41, ensuring that it reaches the exact position of the preset marking point. During the sliding process, to reduce friction and ensure smooth sliding, an appropriate amount of lubricant is typically applied to the contact surface between the permanent saddle support pad 600 and the lower half of the permanent saddle 41. At the same time, construction personnel must continuously observe and control the direction and distance of the sliding to ensure that the lower half of the permanent saddle 41 is accurately positioned.

[0084] Step 7: erect the side span steel beam, lower the main cable structure 200 into the lower half saddle body 41 of the permanent saddle and limit it, and buckle the upper half saddle body 42 of the permanent saddle to the lower half saddle body 41 of the permanent saddle and fix it.

[0085] Specifically, firstly, the upper half saddle body 42 of the permanent cable saddle is hoisted by adopting the swinging method.

[0086] The swing-and-shift method is a common lifting technique used in bridge construction. Using specialized lifting equipment and a rope system, the upper saddle half 42 of the permanent cable saddle is lifted, utilizing the equipment's lifting capacity. The rope system also controls its position and posture in mid-air. After lifting the upper saddle half 42, construction workers must precisely maneuver it toward the lower saddle half 41.

[0087] When the upper half saddle body 42 of the permanent saddle approaches the lower half saddle body 41 of the permanent saddle, a temporary long tie rod bolt is used to limit the position of the two. The temporary long tie rod bolt has a long rod body that can pass through the preset bolt holes of the upper half saddle body 42 of the permanent saddle and the lower half saddle body 41 of the permanent saddle. By preliminarily tightening the temporary long tie rod bolt, the upper half saddle body 42 of the permanent saddle and the lower half saddle body 41 of the permanent saddle can maintain a stable relative position during the process of lifting the steel beam, preventing the two from being misaligned due to external forces. This step provides important preliminary preparation for the subsequent accurate buckling and fixation, ensuring that the positional relationship between the upper half saddle body 42 of the permanent saddle and the lower half saddle body 41 of the permanent saddle will not change significantly during the lifting of the steel beam.

[0088] During the continued installation of the steel beams, the morphological changes of the main cable structure 200 must be continuously monitored. As the beams are installed and the loads on the cable structure increase, the cable structure 200 gradually deforms, approaching the final bridge alignment. Construction personnel use specialized measuring instruments, such as total stations and levels, to monitor the alignment of the main cable structure 200 in real time, measuring parameters such as the cable's sag, elevation, and spatial position at various points. These measurements are then compared with the designed alignment parameters for the final bridge.

[0089] When monitoring data indicates that the main cable structure 200 has reached the bridge alignment, the upper saddle half 42 of the permanent saddle is precisely fastened to the lower saddle half 41 of the permanent saddle for final securement. This securement typically involves using high-strength bolts to securely connect the upper and lower saddle halves 42, 41 to the specified torque requirements. During the bolt tightening process, a specific tightening sequence must be followed to ensure uniform force distribution between the upper and lower saddle halves 42, 41, thereby ensuring the stability and reliability of the entire permanent saddle 4 structure.

[0090] The above embodiments merely illustrate the basic principles and features of the present invention. The present invention is not limited to the above embodiments. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for installing a super-large side span main cable, characterized in that: include: Step 1: a temporary saddle pad (300) is provided on the top of the support tower (100), a temporary saddle body (1) is detachably mounted on the temporary saddle pad (300), and a lifting bracket (3) and a retainer (2) are provided on the side of the support tower (100); Step 2: erecting a main cable structure (200), pulling the main cable structure (200) and confining it to the temporary saddle body (1) and the retainer (2); Step 3: closing and locking the temporary saddle body (1) to clamp the main cable structure (200), and performing a cable tightening operation on the main cable structure (200); Step 4: Release the connection between the temporary saddle body (1) and the temporary saddle support pad (300), hoist the mid-span steel beam to tighten and lift the main cable structure (200), and at the same time operate the lifting bracket (3) to lift the main cable structure (200), so that the temporary saddle body (1) is separated from the temporary saddle support pad (300), and the lower half of the temporary saddle body (1) is removed; Step 5: releasing the closed locking state of the temporary saddle body (1), and removing the upper half of the temporary saddle body (1) and the temporary saddle support pad (300); Step 6: Arrange a permanent saddle lower half saddle body (41) on the top of the support tower (100); Step 7: erect the side span steel beam, lower the main cable structure (200) into the lower half saddle body (41) of the permanent saddle and limit it, and fasten the upper half saddle body (42) of the permanent saddle to the lower half saddle body (41) of the permanent saddle and fix it.

2. The method for installing the super-large side span main cable according to claim 1, characterized in that: The upper part of the temporary saddle body (1) comprises mutually buckled hoop structures and is detachably connected via locking bolts.

3. The method for installing the super-large side span main cable according to claim 1, characterized in that: In the second step: Before erecting the main cable structure (200), a catwalk structure (5) is erected first, wherein the catwalk structure (5) includes a catwalk load-bearing cable (51), a gantry load-bearing cable (52) and a main cable erection traction system (53).

4. The method for installing the super-large side span main cable according to claim 1, characterized in that: The section of the main cable structure (200) near the supporting tower (100) is defined as a temporary section. In the step three, when the main cable structure (200) is tightened, the main cable structure (200) in the temporary section is not tightened.

5. The method for installing the super-large side span main cable according to claim 4, characterized in that: In the step five, it also includes performing a cable tightening operation on the main cable structure (200) of the temporary section.

6. The method for installing the super-large side span main cable according to claim 1, characterized in that: In the step six, a permanent saddle lower half saddle body (41) is provided on the top of the support tower (100), comprising: A permanent saddle pad (600) is provided on the top of the support tower (100); Placing the lower half saddle body (41) of the permanent saddle on the permanent saddle support pad (600), and aligning the lower half saddle body (41) of the permanent saddle with a preset marking point of the main cable structure (200); Slide the lower half saddle body (41) of the permanent saddle to the preset marking point.

7. The method for installing the super-large side span main cable according to claim 1, characterized in that: In the step 7, the upper half saddle body (42) of the permanent saddle is fastened to the lower half saddle body (41) of the permanent saddle and fixed, which includes: The upper half saddle body (42) of the permanent cable saddle is hoisted by a swinging method, and the upper half saddle body (42) of the permanent cable saddle and the lower half saddle body (41) of the permanent cable saddle are limitedly matched by using temporary long pull rod bolts; During the process of continuing to hoist the steel beam, when the main cable structure (200) reaches the bridge alignment, the upper half saddle body (42) of the permanent saddle is buckled onto the lower half saddle body (41) of the permanent saddle and fixed.

8. The method for installing the super-large side span main cable according to claim 1, characterized in that: The step one further comprises: A support gantry (101) is provided on the support tower (100), and a slidable hoist (102) is provided on the support gantry (101), wherein the hoist (102) is used for hoisting the temporary saddle pad (300).

9. The method for installing the super-large side span main cable according to claim 8, characterized in that: Two hoists (102) are provided, and the two hoists (102) are symmetrically distributed about the axis of the main cable structure (200).

10. The method for installing the super-large side span main cable according to claim 1, characterized in that: The step one further comprises: A permanent auxiliary cable saddle bottom plate (400) and a permanent auxiliary cable saddle slide plate lower bearing plate (500) are provided on the top of the support tower (100).

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