A method for erecting a catwalk bearing cable of a catwalk suspension bridge for oil and gas pipelines

Abstract

This application relates to a method for erecting the catenary support cable of an oil and gas pipeline suspension bridge. A first guiding connection device is installed at the bridgehead. Using the side span support cable, a first fixing device at the top of an adjacent support tower is connected to the first guiding connection device at that bridgehead, and then the side span cable is wound up. Using the middle span support cable, the first fixing devices at the top of two adjacent support towers are connected to a second guiding connection device, and then the middle span cable is wound up. During the side span and middle span cable winding, one end of the side span support cable is connected to the first fixing device, and the other end passes through the first guiding connection device; one end of the middle span support cable is connected to the first fixing device, and the other end passes through the second guiding connection device. Then, through the cooperation of a chain hoist, a long auxiliary rope, and a short auxiliary rope, the cable is wound up multiple times. This method allows for the completion of the erection on an oil and gas pipeline suspension bridge with relatively low dead load, a narrow bridge deck, and high flexibility, solving the land occupation and impact problems caused by the placement of winches.

Description

Technical Field

[0001] This application relates to the field of suspension bridge maintenance and construction technology, and in particular to a method for erecting load-bearing cables for the catwalk of an oil and gas pipeline suspension bridge. Background Technology

[0002] Currently, suspension bridges for oil and gas pipelines use parallel steel wire bundles with heat-insulated polyethylene sheaths for their main cables. These bundles have relatively small cross-sectional dimensions, making them highly susceptible to aging and stress cracking due to initial defects and environmental factors. Furthermore, rainwater ingress into the main cables can cause corrosion of the parallel steel wires, leading to a reduction in stiffness. This is particularly problematic for bridges with varying tower heights, where the tower base and the top of the abutment are connected by pins. Using suspended platforms as maintenance facilities poses a significant risk of unbalanced stress, severely threatening the safety of the original suspension bridge.

[0003] Additionally, catwalks are temporary construction access roads erected under the main cables during the construction of suspension bridges. They also serve as high-altitude scaffolding for construction workers and can be construction platforms for the main cable system or even the entire superstructure of the suspension bridge. The load-bearing cables of these catwalks are not held in place by suspenders, unlike suspension bridges which are held in place by suspenders, so they are not completely parallel to the bridge. However, oil and gas pipeline suspension bridges are not entirely the same as existing bridges (such as highway suspension bridges). They are characterized by lower dead loads, narrower bridge decks, and greater flexibility. Their design and construction do not consider maintenance throughout the entire operational life cycle, and they generally do not have maintenance platforms.

[0004] Therefore, in order to facilitate the maintenance and construction of oil and gas pipeline suspension bridges by setting up catwalks, it is necessary to overcome the construction difficulties caused by the relatively small dead load, narrow bridge deck, and high flexibility of oil and gas pipeline suspension bridges.

[0005] Furthermore, during the construction of catwalks, the side spans and mid-span load-bearing cables are typically erected using the direct lifting method and the aerial traction method, respectively, with winches as the main construction equipment. This not only involves complex structures and procedures but also requires a sufficiently large construction site to accommodate the traction system. In addition, oil and gas pipeline suspension bridges typically have main spans between 100 and 360 meters, are built in valleys, and have limited construction space. The impact on the towers and main cables caused by the start and stop of the winches is also a significant risk. Summary of the Invention

[0006] This application provides a method for erecting the catenary support cable of an oil and gas pipeline suspension bridge, in order to solve the construction difficulties caused by the small dead load, narrow bridge deck and high flexibility of oil and gas pipeline suspension bridges in valley sections in related technologies, as well as the problems of site constraints and winch start-stop impact caused by the aerial traction erection method using winches as the main construction equipment.

[0007] Firstly, a method for erecting load-bearing cables for the catenary of a suspension bridge over an oil and gas pipeline is provided, comprising:

[0008] A first guide connection device is installed at the bridgehead;

[0009] Using the side span load-bearing cable, the first fixing device at the top of the support tower adjacent to the bridgehead is connected to the first guide connection device at the bridgehead, and then the side span cable is wound up.

[0010] Using the mid-span load-bearing cable, connect the first fixing device at the top of the two adjacent support towers to the second guide connection device, and then perform mid-span cable winding.

[0011] After completing the side and middle span rope take-up, the alignment is adjusted.

[0012] In some embodiments, one end of the side span load-bearing cable is connected to the first fixing device, and the other end passes through the first guide connection device and extends toward the support tower to the designed distance;

[0013] One end of the mid-span load-bearing cable is connected to the first fixing device, and the other end passes through the second guide connecting device and extends vertically downward to the design distance.

[0014] In some embodiments, the side-span rope take-up includes the following steps:

[0015] A first short auxiliary rope is installed on the portion of the side span load-bearing cable near the top of the support tower;

[0016] A second short auxiliary rope is installed at the take-up end of the side span load-bearing cable;

[0017] Connect the chain hoist to the first and second short auxiliary ropes, and then pull the second short auxiliary rope towards the first short auxiliary rope;

[0018] When the pulling distance reaches the limit of the chain hoist, the side span load-bearing cable is temporarily connected to the first guide connection device.

[0019] Disconnect the chain hoist and the second short auxiliary rope, and move the second short auxiliary rope away from the first short auxiliary rope to a set distance. Then, reconnect the second short auxiliary rope to the side span load-bearing cable.

[0020] Disconnect the temporary connection, reconnect the chain hoist to the first and second short auxiliary ropes, and pull.

[0021] Repeat the above steps to complete the winding of the load-bearing cable on the opposite side span.

[0022] In some embodiments, the side-span rope take-up includes the following steps:

[0023] Install a first short auxiliary rope on the side span load-bearing cable;

[0024] Connect the chain hoist to the first short auxiliary rope, and then pull the first short auxiliary rope until the first short auxiliary rope reaches the position of the first guide connection device;

[0025] Release the chain hoist and temporarily connect the first short auxiliary rope to the first guide connecting device;

[0026] Partially wind up the side span load-bearing cable; after partial wind-up, temporarily connect the side span load-bearing cable to the first guide connection device; disconnect the temporary connection of the first short auxiliary rope, move it a set distance toward the support tower, and then reconnect it to the side span load-bearing cable.

[0027] Release the temporary connection of the side span load-bearing cable and use the chain hoist to pull the first short auxiliary rope again;

[0028] Repeat the above steps to complete the winding of the load-bearing cable on the opposite side span.

[0029] In some embodiments, the mid-span rope winding includes the following steps:

[0030] A long auxiliary rope is installed on the mid-span load-bearing cable, one end of which passes through the second guide connection device and hangs down toward the ground;

[0031] Connect the chain hoist to the lower part of the long auxiliary rope, and pull the long auxiliary rope downwards;

[0032] When the end of the long auxiliary rope connected to the mid-span load-bearing cable reaches its limit position, the drooping part of the long auxiliary rope is temporarily fixed, and the mid-span load-bearing cable is partially wound up.

[0033] After the partial rope winding operation is completed, install the third short auxiliary rope on the drooping part of the long auxiliary rope; release the temporary fixation and connect the chain hoist to the third short auxiliary rope; use the chain hoist to pull the third short auxiliary rope downwards. When it is pulled to the estimated distance, temporarily fix the drooping part of the long auxiliary rope again and perform the partial rope winding operation again.

[0034] After completing the partial rope winding operation again, move the connection point between the third short auxiliary rope and the long auxiliary rope upwards; then release the temporary fixation and use the chain hoist to pull the third short auxiliary rope again;

[0035] Repeat the above steps for the third short auxiliary rope to complete the winding of the mid-span load-bearing cable.

[0036] In some embodiments, the following steps are included before installing the long auxiliary rope on the mid-span load-bearing cable:

[0037] A second fixing device is provided on the plane where the first guide connecting device is located, and directly below the second guide connecting device; the second fixing device is used to temporarily fix the hanging part of the long auxiliary rope.

[0038] In some embodiments, the following steps are included before installing the long auxiliary rope on the mid-span load-bearing cable:

[0039] A portal scaffold is erected on the support tower and reinforced with steel pipe clamps; the portal scaffold is used as a working platform for raising and lowering the rope.

[0040] In some embodiments, both the first guide connecting device and the second guide connecting device include:

[0041] Two anchorages are spaced apart along the transverse direction of the bridge, and each has an anchor plate at its bottom;

[0042] A connecting rod, with two anchor seats passing through its two ends respectively, and fixedly connected to the two anchor seats respectively;

[0043] The guide wheel is coaxially mounted on the connecting rod, and a load-bearing cable receiving groove is provided on its outer periphery.

[0044] In some embodiments, the guide wheel is mounted on the connecting rod via an axial position adjustment assembly.

[0045] In some embodiments, the first fixing device includes:

[0046] Two fixed seats are spaced apart along the transverse bridge direction;

[0047] A fixing rod is provided along the transverse direction of the bridge, and its two ends are respectively connected to the two fixing seats; the fixing rod is used to form a load-bearing cable installation groove between itself and the fixing surface of the fixing seat.

[0048] The beneficial effects of the technical solution provided in this application include:

[0049] This application provides a method for erecting the catenary support cable of an oil and gas pipeline suspension bridge. A first guiding connection device is installed at the bridgehead; using the side span support cable, the first fixing device at the top of the adjacent support tower is connected to the first guiding connection device at the bridgehead, and then the side span cable is wound up; using the middle span support cable, the first fixing devices at the top of two adjacent support towers are connected to the second guiding connection device, and then the middle span cable is wound up. This ensures that during the side span and middle span cable winding, one end of the side span support cable is connected to the first fixing device, and the other end passes through the first guiding connection device; one end of the middle span support cable is connected to the first fixing device, and the other end passes through the second guiding connection device. Then, through the cooperation of a chain hoist, long auxiliary rope, and short auxiliary rope, multiple pulling and winding operations are performed to complete the erection within the limited space of the original bridge, requiring less site area. This overcomes the construction difficulties caused by the relatively small dead load, narrow bridge deck, and high flexibility of oil and gas pipeline suspension bridges. Furthermore, the winch is eliminated, solving the land occupation and impact problems caused by arranging a winch. Attached Figure Description

[0050] 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.

[0051] Figure 1 A schematic diagram of the overall structure of the load-bearing cable and auxiliary rope for use in the catwalk provided in this application embodiment;

[0052] Figure 2 This is a schematic diagram illustrating the state of the catwalk side span load-bearing cable during rope winding, as provided in an embodiment of this application.

[0053] Figure 3 This is a schematic diagram of the structure of the take-up end of the long auxiliary rope of the mid-span load-bearing cable of the catwalk during the take-up process, as provided in an embodiment of this application.

[0054] Figure 4 This is a schematic diagram of the structure of the short auxiliary rope of the mid-span load-bearing cable during rope winding, provided in an embodiment of this application.

[0055] Figure 5 This is a schematic diagram of the mid-span load-bearing cable take-up end structure of the catwalk provided in this application embodiment.

[0056] In the diagram: 1. First guide connection device; 2. Support tower; 3. First fixing device; 4. Second guide connection device; 5. Second fixing device; 6. Side span load-bearing cable; 7. Middle span load-bearing cable; 8. First short auxiliary rope; 9. Second short auxiliary rope; 10. Long auxiliary rope; 11. Third short auxiliary rope. Detailed Implementation

[0057] 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.

[0058] A method for erecting the catenary support cable of a suspension bridge for oil and gas pipelines is proposed to solve the construction difficulties caused by the small dead load, narrow bridge deck and high flexibility of suspension bridges for oil and gas pipelines in valley sections in related technologies, as well as the problems of site constraints and winch start-stop impact caused by the aerial traction erection method using winches as the main construction equipment.

[0059] Please see Figures 1-5 A method for erecting load-bearing cables for the catenary of a suspension bridge for oil and gas pipelines, comprising the following steps:

[0060] A first guide connection device 1 is installed at the bridgehead; that is, the first guide connection device 1 is installed at both ends of the bridgehead in the longitudinal direction of the suspension bridge.

[0061] Using the side span load-bearing cable 6, the first fixing device 3 at the top of the support tower 2 adjacent to the bridgehead is connected to the first guide connecting device 1 at the bridgehead, and then the side span cable is pulled up.

[0062] Using the mid-span load-bearing cable 7, the first fixing device 3 at the top of the two adjacent support towers 2 is connected to the second guide connecting device 4, and then the mid-span cable is wound up; wherein the support tower 2 is the bridge tower of the suspension bridge.

[0063] After completing the side and middle span rope take-up, the alignment is adjusted.

[0064] In the above erection method, the first fixing device 3 and the second guide connecting device 4 on the support tower 2 are configured as follows:

[0065] The first type, like Figure 1 As shown, there are two support towers 2. One support tower 2 is equipped with a first fixing device 3 and a second guide connecting device 4 on its top. The first fixing device 3 is located on the side near the bridgehead. The other support tower 2 is equipped with two first fixing devices 3 on its top.

[0066] The second type has three support towers. The top of the middle support tower 2 is equipped with two second guide connecting devices 4, and the tops of the two support towers 2 near the bridgehead are equipped with two first fixing devices 3.

[0067] The third type has three support towers. The top of the support tower 2 in the middle is equipped with two first fixing devices 3. The tops of the two support towers 2 near the bridgehead are equipped with first fixing devices 3 and second guide connecting devices 4. The first fixing devices 3 are located on the side near the bridgehead, and the second guide connecting devices 4 are connected to the first fixing devices 3 at the top of the support tower 2 in the middle.

[0068] The fourth type has four support towers. Among the two support towers 2 near the two ends of the bridgehead, one of the support towers 2 is equipped with two first fixing devices 3, and the other support towers 2 are equipped with first fixing devices 3 and second guide connecting devices 4. The first fixing devices 3 are located on the side facing the bridgehead.

[0069] There are actually several other forms, which will not be detailed here. The key is to ensure that the top of the support tower 2 near the bridgehead has a first fixing device 3 that is connected to the first guide connecting device 1.

[0070] With the above structural setup, a first guide connection device 1 is installed at the bridgehead; the side span load-bearing cable 6 is used to connect the first fixing device 3 at the top of the adjacent support tower 2 to the first guide connection device 4 at the bridgehead, and then the side span cable is pulled up; the middle span load-bearing cable 7 is used to connect the first fixing device 3 at the top of the two adjacent support towers 2 to the second guide connection device 4, and then the middle span cable is pulled up; so that when pulling up the side span cable and the middle span cable, one end of the side span load-bearing cable 6 is connected to the first fixing device 3, and the other end passes through the first guide connection device 1; one end of the middle span load-bearing cable 7 is connected to the first fixing device 3, and the other end passes through the second guide connection device 4, and then multiple pulling and pulling operations are carried out through the cooperation of chain hoists and long and short auxiliary ropes, so that the erection can be completed within the limited position of the original bridge, without requiring a large site and not being restricted by the site, thus overcoming the construction difficulties caused by the small dead load, narrow bridge deck and large flexibility of the oil and gas pipeline suspension bridge; in addition, the winch is eliminated, solving the land occupation and impact problems caused by the placement of the winch.

[0071] In some preferred embodiments, the connection preparation work for the side span load-bearing cable 6 and the middle span load-bearing cable 7 before rope winding is specifically described, including the following methods:

[0072] One end of the side span load-bearing cable 6 is hoisted to the top of the support tower 2, and then a loop is formed by the rope clamp and connected to the first fixing device 3. The other end passes through the first guide connecting device 1 and extends toward the support tower 2 to the designed distance.

[0073] One end of the mid-span load-bearing cable 7 is hoisted to the top of the support tower 2, and then connected to the first fixing device 3 by forming a loop with a rope clamp. The other end passes through the second guide connection device 4 and extends vertically downward to the design distance.

[0074] refer to Figure 2 A schematic diagram of one of the processes in the side span rope winding is given. The side span rope winding includes the following steps:

[0075] ① Install the first short auxiliary rope 8 on the part of the side span load-bearing cable 6 near the top of the support tower 2; hoist the side span load-bearing cable 6 to the top of the support tower and then install it on the first fixing device 3 through rope clamps.

[0076] ② Install the second short auxiliary rope 9 at the rope-receiving end of the side span load-bearing cable 6 using a rope clamp;

[0077] ③ Connect the chain hoist to the first short auxiliary rope 8 and the second short auxiliary rope 9, and then pull the second short auxiliary rope 9 to move towards the first short auxiliary rope 8;

[0078] ③ When the pulling distance reaches the limit of the chain hoist, the side span load-bearing cable 6 is temporarily connected to the first guide connection device 1. The temporary connection is made by forming a loop with a rope clamp, and the loop is connected to the first guide connection device 1. When it is necessary to disconnect, the corresponding rope clamp can be removed.

[0079] ④ After disconnecting the chain hoist and the second short auxiliary rope 9, and moving the second short auxiliary rope 9 away from the first short auxiliary rope 8 to the set distance, the second short auxiliary rope 9 is reconnected to the side span load-bearing cable 6.

[0080] ⑤ Disconnect the temporary connection between the side span load-bearing cable 6 and the first guide connection device 1, and reconnect the chain hoist with the first short auxiliary rope 8 and the second short auxiliary rope 9, and pull them.

[0081] ⑥ Repeat steps ②-⑤ above to complete the winding of the opposite span load-bearing cable 6.

[0082] There is another way, specifically:

[0083] ① Install the first short auxiliary rope 8 on the side span load-bearing cable 6, hoist it to the top of the support tower, and then install it on the first fixing device 3 through rope clamps;

[0084] ② Connect the chain hoist to the first short auxiliary rope 8, and then pull the first short auxiliary rope 8 until the first short auxiliary rope 8 reaches the position of the first guide connecting device 1;

[0085] ③ Release the chain hoist and temporarily connect the first short auxiliary rope 8 to the first guide connecting device 1;

[0086] ④ Partially wind up the side span load-bearing cable 6; after partial winding up, the side span load-bearing cable 6 is temporarily connected to the first guide connection device 1; the first short auxiliary rope 8 is released from temporary connection and moved a set distance toward the support tower 2 before being reconnected to the side span load-bearing cable 6.

[0087] ⑤ Disconnect the temporary connection of the side span load-bearing cable 6, and use the chain hoist to pull the first short auxiliary rope 8 again;

[0088] ⑥ Repeat steps ②-⑤ above to complete the winding of the load-bearing cable 6 on the opposite side span.

[0089] By following the steps above, the rope winding operation can be completed at the bridgehead, thus completing the erection of the side span load-bearing cable 6. The limit stroke refers to the maximum working stroke of the chain hoist. The set distance and design distance can be changed as needed. The rope winding process above involves multiple steps to achieve winding within a limited space, without the use of a winch.

[0090] refer to Figures 2-5 In some preferred embodiments, the mid-span rope winding includes the following steps:

[0091] ① One end of the mid-span load-bearing cable 7 is hoisted to the top of the support tower 2 and then installed on the first fixing device 3 through a rope clamp. A long auxiliary rope 10 is installed on the mid-span load-bearing cable 7 through a rope clamp, wherein one end of the long auxiliary rope 10 passes through the second guide connecting device 4 and hangs down toward the ground;

[0092] ② Connect the chain hoist to the hanging part of the long auxiliary rope 10, and pull the long auxiliary rope 10 downwards;

[0093] ③ When the end of the long auxiliary rope 10 connected to the mid-span load-bearing cable 7 reaches the limit position, the drooping part of the long auxiliary rope 10 is temporarily fixed, and the mid-span load-bearing cable 7 is partially pulled up; the limit position is when the mid-span load-bearing cable 7 leaves the bridge deck and is suspended in the air; and the connection point between the long auxiliary rope 10 and the mid-span load-bearing cable 7 is close to the support tower; in fact, it is the position where the long auxiliary rope 10 can no longer be pulled on the site, and the following steps are required to continue pulling.

[0094] ④ After the partial rope winding operation is completed, install the third short auxiliary rope 11 on the hanging part of the long auxiliary rope 10 through the rope clamp; release the temporary fixation and connect the chain hoist to the third short auxiliary rope 11; use the chain hoist to pull the third short auxiliary rope 11 downwards. When it is pulled to the estimated distance, temporarily fix the hanging part of the long auxiliary rope 10 again and perform the partial rope winding operation again.

[0095] ⑤ After the partial rope winding operation is completed again, move the connection point of the third short auxiliary rope 11 and the long auxiliary rope 10 upwards; then release the temporary fixation and use the chain hoist to pull the third short auxiliary rope 11 again;

[0096] ⑥ Repeat the above steps ④-⑤ regarding the operation of the third short auxiliary rope 11 to complete the winding of the mid-span load-bearing cable 7.

[0097] Through the above steps, when it is impossible to pull using the long auxiliary rope 10 in a limited space, the rope can be retrieved by repeatedly disassembling and pulling the third short auxiliary rope 11. This multi-step rope retrieval method enables rope retrieval within a limited space without the use of a winch.

[0098] It should be understood that the cutting lengths of the side span load-bearing cable 6 and the first short auxiliary rope 8 and the second short auxiliary rope 9 are primarily for ease of construction. When the two ends of the side span load-bearing cable 6 are lifted, the middle section rests on the truss to reduce the lifting load; the initial connection between the middle span load-bearing cable 7 and the long auxiliary rope 10 and the third short auxiliary rope 11 should be made on the ground; the length of the long auxiliary rope 10 must ensure the required length of the third short auxiliary rope 11 to which it is connected; in the later stages of rope winding, the middle span load-bearing cable 7 should have a certain degree of sag.

[0099] Furthermore, the specific use of the first guide connecting device 1, the first fixing device 3, the second guide connecting device 4, and the second fixing device 5 for the rope winding operation during the erection of the side span load-bearing cable 6 and the middle span load-bearing cable 7, including but not limited to the above rope winding methods, is within the scope of this application as long as the above devices are used for rope winding.

[0100] Furthermore, to facilitate the temporary fixing of the drooping portion of the long auxiliary rope 10, the following steps are included before installing the long auxiliary rope 10 on the mid-span load-bearing cable 7:

[0101] A second fixing device 5 is provided on the plane of the first guide connecting device 1 and directly below the second guide connecting device 4; the second fixing device 5 is used to temporarily fix the hanging part of the long auxiliary rope 10.

[0102] Before installing the long auxiliary rope 10 on the mid-span load-bearing cable 7, the following steps are also included: erecting a portal scaffold on the support tower 2 and reinforcing it with steel pipe clamps; the portal scaffold is used as a working platform for winding and unwinding the rope, which facilitates the winding of the rope.

[0103] The structure of the long and short auxiliary ropes in the above process is as follows: Figures 2-5 As shown, it has a collar and a rope clamp, the rope clamp being a common component in this field.

[0104] In some preferred embodiments, the structure of the devices used above is described. The first guide connecting device 1 and the second guide connecting device 4 both include: a connecting rod, a guide wheel and two anchor seats.

[0105] Two anchorages are spaced apart along the transverse direction of the bridge, and each has an anchor plate at its bottom. Two anchorages pass through each end of the connecting rod, and the connecting rod is fixedly connected to each anchorage. A guide wheel is coaxially mounted on the connecting rod, and its outer circumference has a groove for receiving the load-bearing cable. The connecting rod is connected to the mid-span load-bearing cable 7 and the side-span load-bearing cable 6 via a collar. The guide wheel facilitates the movement of the mid-span load-bearing cable 7.

[0106] The guide wheel is mounted on the connecting rod via an axial position adjustment assembly to facilitate lateral bridge adjustment. The axial position adjustment assembly includes a central sleeve shaft with a channel for the connecting rod to pass through. The central sleeve shaft has a fastening screw hole with a fastening screw. The outer surface of the connecting rod has evenly spaced insertion slots along its length, and the inner wall of each slot is threaded. When the fastening screw is connected to different insertion slots, the position of the central sleeve changes accordingly.

[0107] The first fixing device 3 includes: two fixing seats spaced apart along the transverse direction of the bridge; a fixing rod arranged along the transverse direction of the bridge, with its two ends connected to the two fixing seats respectively; the fixing rod is used to form a load-bearing cable installation groove between itself and the fixing surface of the fixing seats. The load-bearing cable installation groove facilitates the entry of the sleeve, which is then secured by a rope clamp.

[0108] In some preferred embodiments, with Figure 1 Taking the catwalk load-bearing cable as an example, the elevation is measured and adjusted in the following order: first one side span → the other side span → the middle span. Based on the relationship between elevation changes and cable length, the required length to be extended or retracted is calculated, and then adjustments are made. Specifically:

[0109] When it is necessary to reel in the middle span load-bearing cable 7 and the side span load-bearing cable 6, loosen but do not remove the rope clamps at the reeling end loops of the middle span load-bearing cable 7 and the side span load-bearing cable 6. Under their own weight, the middle span load-bearing cable 7 and the side span load-bearing cable 6 will fall, and the falling height will be controlled by the chain hoist. When it is necessary to release the middle span load-bearing cable 7 and the side span load-bearing cable 6, if the middle span load-bearing cable 7 and the side span load-bearing cable 6 are too low, the rope clamps at the reeling end loops of the middle span load-bearing cable 7 and the side span load-bearing cable 6 need to be removed, and the reeling should be restarted.

[0110] After adjustment, secure with rope clamps and mark with a paint pen. Once the alignment adjustment is complete, loosen the chain hoist until the long auxiliary rope 10 falls below the mid-span load-bearing cable 7, then proceed with the subsequent handrail cable hoisting, rope winding, and catwalk surface construction. Additionally, during the alignment adjustment process, a tower deflection monitoring device is used to monitor the alignment, and then lateral adjustments are made using the axial position adjustment component.

[0111] In summary, the load-bearing cable can be laid flat on the spanning structure, connected to the load-bearing cable via a secondary rope and rope clamps, and lifted by pulling the secondary rope using the first guide connecting device 1, the first fixing device 3, the second guide connecting device 4, and a chain hoist. The construction is simple. The chain hoist operation is mainly completed on the ground, reducing the safety risks for construction personnel. The main construction equipment is the chain hoist. Except when the load-bearing cable in the mid-span is being wound up, requiring the installation of a winding tool (second fixing device 5) at the bottom of the tower at the winding end, the winding up of the load-bearing cable in the side spans utilizes the anchoring device at the front end of the anchor (first guide connecting device 1), resulting in low construction costs.

[0112] 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.

[0113] 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.

[0114] 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 method for erecting load-bearing cables for the catenary of a suspension bridge over an oil and gas pipeline, characterized in that, It includes: A first guide connection device (1) is installed at the bridgehead; Using the side span load-bearing cable (6), the first fixing device (3) at the top of the support tower (2) adjacent to the bridgehead is connected to the first guide connection device (1) at the bridgehead, and then the side span cable is pulled up. Using the mid-span load-bearing cable (7), connect the first fixing device (3) at the top of the two adjacent support towers (2) to the second guide connection device (4), and then perform mid-span cable winding; After completing the side span rope take-up and middle span rope take-up, adjust the alignment. The mid-span rope winding process includes the following steps: A long auxiliary rope (10) is installed on the mid-span load-bearing cable (7), wherein one end of the long auxiliary rope (10) passes through the second guide connecting device (4) and hangs down toward the ground; Connect the chain hoist to the hanging part of the long auxiliary rope (10) and pull the long auxiliary rope (10) downwards. When the end of the long auxiliary rope (10) connected to the middle span load-bearing cable (7) reaches the limit position, the drooping part of the long auxiliary rope (10) is temporarily fixed, and the middle span load-bearing cable (7) is partially wound up. After the partial rope winding operation is completed, install the third short auxiliary rope (11) on the hanging part of the long auxiliary rope (10); release the temporary fixation and connect the chain hoist to the third short auxiliary rope (11); use the chain hoist to pull the third short auxiliary rope (11) downwards. When it is pulled to the estimated distance, temporarily fix the hanging part of the long auxiliary rope (10) again and perform the partial rope winding operation again. After the partial rope winding operation is completed again, move the connection point of the third short auxiliary rope (11) to the long auxiliary rope (10) upward; then release the temporary fixation and use the chain hoist to pull the third short auxiliary rope (11) again. Repeat the above steps for the third short auxiliary rope (11) to complete the winding of the mid-span load-bearing cable (7).

2. The method for erecting the load-bearing cable of the catenary of a suspension bridge for oil and gas pipelines as described in claim 1, characterized in that: One end of the side span load-bearing cable (6) is connected to the first fixing device (3), and the other end passes through the first guide connection device (1) and extends toward the support tower (2) to the designed distance; One end of the mid-span load-bearing cable (7) is connected to the first fixing device (3), and the other end passes through the second guide connecting device (4) and extends vertically downward to the design distance.

3. The method for erecting load-bearing cables for the catenary of a suspension bridge for oil and gas pipelines as described in claim 1, characterized in that, The side-span rope winding includes the following steps: A first short auxiliary rope (8) is installed on the portion of the side span load-bearing cable (6) near the top of the support tower (2); A second short auxiliary rope (9) is installed at the take-up end of the side span load-bearing cable (6); Connect the chain hoist to the first short auxiliary rope (8) and the second short auxiliary rope (9), and then pull the second short auxiliary rope (9) to move towards the first short auxiliary rope (8); When the pulling distance reaches the limit of the chain hoist, the side span load-bearing cable (6) is temporarily connected to the first guide connection device (1); After disconnecting the chain hoist and the second short auxiliary rope (9), and moving the second short auxiliary rope (9) away from the first short auxiliary rope (8) to a set distance, the second short auxiliary rope (9) is reconnected to the side span load-bearing cable (6); Release the temporary connection, reconnect the chain hoist to the first short auxiliary rope (8) and the second short auxiliary rope (9), and pull; Repeat the above steps to complete the winding of the opposite span load-bearing cable (6).

4. The method for erecting the load-bearing cables of the catenary of a suspension bridge for oil and gas pipelines as described in claim 1, characterized in that, The side-span rope winding includes the following steps: Install a first short auxiliary rope (8) on the side span load-bearing cable (6); Connect the chain hoist to the first short auxiliary rope (8), and then pull the first short auxiliary rope (8) until the first short auxiliary rope (8) reaches the position of the first guide connecting device (1); Release the chain hoist and temporarily connect the first short auxiliary rope (8) to the first guide connecting device (1); Partially wind up the side span load-bearing cable (6); after partial wind-bearing, the side span load-bearing cable (6) is temporarily connected to the first guide connection device (1); the first short auxiliary rope (8) is temporarily disconnected and moved a set distance toward the support tower (2) before being reconnected to the side span load-bearing cable (6); Release the temporary connection of the side span load-bearing cable (6) and use the chain hoist to pull the first short auxiliary rope (8) again. Repeat the above steps to complete the winding of the opposite span load-bearing cable (6).

5. The method for erecting the load-bearing cable of the catenary of a suspension bridge for oil and gas pipelines as described in claim 1, characterized in that: Before installing the long auxiliary rope (10) on the mid-span load-bearing cable (7), the following steps are also included: A second fixing device (5) is provided on the plane of the first guide connecting device (1) and directly below the second guide connecting device (4); the second fixing device (5) is used to temporarily fix the hanging part of the long auxiliary rope (10).

6. The method for erecting the load-bearing cable of the catenary of a suspension bridge for oil and gas pipelines as described in claim 1, characterized in that: Before installing the long auxiliary rope (10) on the mid-span load-bearing cable (7), the following steps are also included: A portal scaffold is erected on the support tower (2) and reinforced with steel pipe hoops; the portal scaffold is used as a working platform for raising and lowering ropes.

7. The method for erecting load-bearing cables for the catenary of a suspension bridge for oil and gas pipelines as described in claim 1, characterized in that, Both the first guide connecting device (1) and the second guide connecting device (4) include: Two anchorages are spaced apart along the transverse direction of the bridge, and each has an anchor plate at its bottom; A connecting rod, with two anchor seats passing through its two ends respectively, and fixedly connected to the two anchor seats respectively; The guide wheel is coaxially mounted on the connecting rod, and a load-bearing cable receiving groove is provided on its outer periphery.

8. The method for erecting the load-bearing cable of the catenary of a suspension bridge for oil and gas pipelines as described in claim 7, characterized in that: The guide wheel is mounted on the connecting rod via an axial position adjustment assembly.

9. The method for erecting load-bearing cables for the catenary of a suspension bridge for oil and gas pipelines as described in claim 1, characterized in that, The first fixing device (3) includes: Two fixed seats are spaced apart along the transverse bridge direction; A fixing rod is provided along the transverse direction of the bridge, and its two ends are respectively connected to the two fixing seats; the fixing rod is used to form a load-bearing cable installation groove between itself and the fixing surface of the fixing seat.

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